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Патент USA US2409399

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Oct. 15, 1946.
:-R. c. SHOEMAKER
2,409,398 '.
TRUCK LOADER
Filed Feb. 16, 1945
1
a Sheets-Sheet 1
Oét. 175', 1946;
V i R. g; sHoEMAKER.
_
7 2,409,398
TRUCK LOADER
Filed Feb. 16,-1945 ,
‘ 6 Sheets-Sheet 2
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Oct. 15, 1946. v '
V ‘ R. c. SHOEMAKER
‘2, 9,398
' TRUCK LOADER
Filed Feb. 16, 1945
6y Sheets-Sheet 5
Ill/6733907’? '
3021672’ 61572002011537’
Oct. 15, 1946.
R.‘ c. SHOEMAKER
2,409,398
TRUCK LQADER
Filed Feb. 16‘, 1945
\ bvgi
II
I,
6 Sheets-Sheet 6
Patented Oct. 15, 1946
2,409,398
UNITED STATES PATENT‘OFFICE
2,409,398
TRUCK LOADER
Robert C. Shoemaker, Portland, 0reg., assignor
.to Hyster Companmfortland, Oreg., a corpora
tion of Oregon
Application February 16, 1945, Serial No. 578,256
19 Claims. (01. 214-81)
1
2
This invention relates to truck loaders, and
improved mechanism for controlling a portion of
the sequential movements is relatively unaffected
by the‘p'ositions of loader parts and is protected
against damage from slight overrunning. by the
more particularly to truck loading apparatus
adapted to ‘be mounted on the body of a truck
and carried thereby for operation at will with
.
motive power furnished by the truck and con 6 operator.
The invention has for an additional object th
trolled to a large extent by the truck movements.
The truck loader of the present invention is
provision of an improved lifting‘ structure for a
an improvement, in certain :respects, of that
truck leader in which lifting structure the normal
shown in my co-pending applicationserial No.
lifting position relative‘ to the‘ truck body‘ and
468,927, ?led December 14, 19412,.v now Patent No. 10 the length of the path of swinging ‘movement
2,394,940, granted February 12, 1946.
‘
thereof ‘may be varied.
'
1 '
. It is a general object of this invention to pro
vide an improved truck loader of the character
described in which the structure issimpli?ed from
the standpoint of manufacturing and operation
and the‘ operating characteristics. and controls
are improved.
‘
Still another'object of ‘the invention is to pro-1,
vide a truck loader with parts constructed and
arranged to facilitate the ease of quicklyv securing
the loader parts in an out-of-the-way or travel
ing position during sh‘ort‘hauling trips of the
truck and dumping operations. _
_
Another and more specific‘ object of the inven
Other objects and advantages of the invention
tion is to provide an improved truck loader in
will be apparent fromthe following description
which a single load lifting cable not only carries 20 and the‘ accompanying drawings in which similar
the load carrying device of. the apparatus inver
characters of reference indicate similar parts
tical and swinging: movements, but also co-acts
throughout the several views.
.
with the other parts of the‘ apparatus‘ to control
Fig‘. 1 is a fragmentary and somewhat sche
the timing and. sequence of the movements and
matic‘ side elevational view of a conventional type
to‘ transmit the force for swinging movement in 25 of dump truck having mounted‘ thereon a loader
one direction.
The invention
for a1 further object thepro
vision in a truck‘ loader including a lifting struc-'
ture mounted on the truck body” and a lifting
which is illustrative of the‘ features of my inven
tion;
Fig. 2 is a top plan view of the truck and loader ‘
in Fig. 1;
cable" through which operating‘ force is‘ derived 30 shown
Fig. 3 is a rear elevational view with the front
from a drum- on one ofthe truck driving Wheels
portion of the truck omitted and having parts
of a construction and arrangement" of‘ parts? such
cut away better to illustrate the installation and
that‘. the tendency‘ of the lifting forces to twist
adaptation of the preferred form of loader to a
the'truckbody is minimized, and‘ increased lifting
conventional truck;
force tends to reduce the possibility of truck
Figs. 4 and 5 are, respectively, top plan and side
wheel slippagev which‘. would result in‘ a loss of
elevational views to an enlarged scale of a portion
lifting. e?crt.
‘
'
'
i
of the structure of the loader shown in Figs. 1,
It is another‘ object of the invention- to» provide
2 and 3;
a truck loader‘ in which the cable through which
Fig. 6 is a fragmentary side elevational» view
lifting force is- exerted‘ upon the load handling
to an, enlarged‘ scale of a portion of the structure
device c‘o-acts' with the load. lifting structure to:
shown in Figs. 1,. 2. and 3‘;
exert a practically uniform; load’ swinging torque
Fig. "7 is a fragmentary sectional view of a por
through they full circuit of swinging‘ travel. during.
tion of the structure shown in Fig. 6 with the
the loadingfmovement of‘th'e loadlhandlingi device.
An additional? object‘ of the present invention, 45 section taken substantially on the line 'l-e‘l of
Fig. 9;
‘
is to‘ providev loading. apparatus including a- sim
Figs. 3 and 9 are fragmentary top plan views of
ple. effective and. adjustable ‘boom supporting
a portion of the structure shown in Fig. 6 which
structure whicheffects'increased resistance to the
show the partsof the loader in different operating
swinging movement of the-boom in ‘one’ direction
as the. boom. approaches‘ preselected’ position. of: 50 positions; .
Figs. 10 and 11 are, respectively, fragmentary
sectional and end elevational views of a. winding
Another object of the invention‘v is. to provide" a
drum structure adapted to use with the loader
truck: loader'adapted automatically to follow a‘
wherein the section of Fig. 10 is taken substan
sequence of: movements responsive to predeter
minedzmovements of: the truck, and in which.‘ an ' tially on a line Illa-{lief Fig. 11, and certain parts
rest.
.
l
'
'
2,409,398
3
4
have been cut away to show the structure in Fig.
tend upwardly therefrom to provide supports for
11 ;
Fig. 12 is a fragmentary view of a portion of the
structure shown in Fig. 11; and
Fig. 13 is a top plan view of one part of the
structure shown in Figs. 10 and 11.
Although many of the features of my invention
are more generally applicable, ‘they are shown
and described in this application in an exemplary
removable side extension boards. At one side of
the base frame 40 (the right hand side as viewed
in Figs. 3, 6, 8 and 9) the frame members I32
and 43 extend beyond the side of the truck body
and have downwardly projecting cars 49 secured
thereto through which bolts 50 extend to provide
the hinge supports for side frame members 52 and
53 of the drag bar 29. Frame 40 is desirably
adaptation to a truck loader constructed for re
braced between the ends of the frame members 42
movable installation on dump trucks and the like.
and 43 adjacent the ears 49 by an angle strip 54.
As generally shown in Figs. 1, 2 and 3, the loader
~ As best shown in Figs. 2 and 6 to 9, inclusive, a
20 is mounted on a dump body 22 of a conven
smaller inner frame 55 is removably secured with
tional truck 23 in a manner'an'd position such
iri‘the outer frame 40 at one end thereof for the
that it is adapted to lift material from ground 15 more direct support of the mast and boom struc
level at the, side of the truck. The truck includes
ture. "This inner frame 55 has parallel frame
rear wheels 24 and 25. Although the power for
members 56 ‘and 51 adjacent and spaced some
operating the loader may be provided in different
what inwardly from outer frame members 42 and
ways, it is preferred in the present instance and
43. Thesinner frame members 56 and 51 are pref
with the disclosed structure and arrangement of 20 erably'of channel section and are connected at
parts, to operate the loader by movements of the
their ends by frame members 58 and 59, which
truckand with power obtained through the use
are likewise preferably of channel section. Small
of a winding drum 26 mounted on rear truck
blocks 60 and 62 secured to the top surfaces of the
wheel ,24 onv the opposite side of the’ truck from
frame members 56 and 51, respectively, in di
that upon which the loader is mounted.
25 agonally displaced positions on the inner frame,
. vConsidered generally, the loader includes a sup
are adapted to engage the outer frame members
42 and ‘43 to aid in the placement and support of
the inner frame relatively to the outer frame.
The inner frame is removably secured to the
a generally vertical direction is a mast 28~ which 30 outer frame and supported by rods 63 and 64,
portingbaseZ'l which is preferably secured near
the forward end of the dump truck body. Secured
to the'base and extending upwardly therefrom in
serves as a part of the supporting structure of the
loader. As a counter-part of :the loader a drag
bar 29 is hingedly connected to. the‘end of the
base 2'! near which the mast28ris secured and
each extending through aligned openings in the
outer frame members 42 and 43 and the inner
frame members 56 and 51. Angularly disposed
ends 65 and 66 on the rods 63 and 64, respectively,
extends laterally outwardly and downwardly from 35 serve as handles for the removal of the rods
that end of the base to a position determined by a
and also as latch members which are turned
link 30, having one end connected to the extend
downwardly, as shown in Fig. 6, after the instal
ing end of the drag bar and its other end adjusta
lation of the rods, in which position ears 6'! and
bly anchored to the mast 28 through a chain 32.
68 on the outer frame member 43 hold the rods
In the operation of the loader for use such as 40 in place and prevent their accidental removal.
road work a load carrying device, such as a slip
Intermediate the ends of the inner frame a pair
scraper bucket 33, is drawn forwardly by forward
of oppositely disposed parallel channel members
movement of the truck through a drag'line 34
69 and 10 are secured at their ends to the frame
having one end connected to the bucket and its
members 56 and 51'and provide a support to
other-end connected to the drag bar. Lifting
which a ?anged main support member 12 is se
and movement of the loaded bucket 33 to a posi
cured by bolts 13. As shown in Fig. 7, the ?anged
tion over the truck body for dumping are accom
support member 12 has an opening 14 therein into
plished by a boom 35 having its lower end mount
which a substantially vvertical leg 15 of the mast
ed adjacent the mast 28 for ‘movement about
28 ?ts, and wherein that leg is secured by fas
adjacent vertical and horizontal axes and extend 50 tening-means, such as bolts 16, extending through
ing upwardly and outwardly to a position beyond
both the support-member ‘l2 and the vertical leg
the side of the truck body, which desirably is
15, as well as an inner reinforcing block 11.
practically above the normal line of operation
- Inaddition to the substantially vertical leg 15,
of ‘the bucket. The boom 35 and base 21' carry
the mast 28 includes bracing legs 18 and 19, the
blocks or pulleys, such as 36 and “respectively,
three- of which legs-form atripod'. The tops of
through which a hoisting line 38 extends from a
the legs are secured together by being secured to
coupling on the bucket to the winding drum 26
an anchor plate 80, as shown in Figs. 8 and 9.
to effect lifting and swinging of the bucket dur
The lower ends of the bracing legs 78 and 19 are
ing rearward movement of the truck.
‘
' Considering the various parts of the loader in
greater detail,v the supporting base 2'! includes
an outer frame 43 which ‘extends laterally across
the truck body-and is desirably made up of paral
lel front and rear frame members 42 and 43,
which‘ are preferably‘ of‘ channel section, and
connected together at their ends by longitudinally
extending ‘angle strips 44 and 45, as'weil as an
intermediate bracing strip 46. The outer‘frame
secured to corners of the inner frame 55.
As shown in Figs. 1, 2 and 6, the link 30, which
supports the drag bar 29 at a desired angular po
sition, is anchored through the chain 32 to a
hook 82 on the bracing leg 19 of the mast. In
order that the drag bar 29 shall be substantially
rigid with respect to the longitudinal direction of
forces applied through the drag line 34 to the slip
scr'aperbucket 33, it is substantially triangular
in shape with the side frame members 52 and 53
secured together at their outer ends andextende
40 is secured to the truck body by hook bolts 4''!
extending through the angle strips 44 and 45 70 ing'inwardly to their-hinge support in relative
which serve as runners engaging the side ?anges
of the truck body; the‘ hook'bolts having their
hooked ends gripped around the ?anged side edge
of the body. When desired, channel sockets 48
are secured to the angle strips 44 and 45 and ex
angular relation to each other. Braces 83 and 84
extending between the side frame members 52
and 53’ add additional rigidity to the drag bar
structure. A ring socket 85 provides a connec
tion between the link“ 30 and the drag line 34;
214993.393
.
5
which drag line desirably is divided into two
at 88 and 89, respectively, on opposite sides of
has one» end secured‘ to a ring I26 on the boom
and its other end adjustably connected to a hook
IZ'I on an adjustable back stay anchor I28. A
the slip scraper bucket.
series of spaced apertures I29 aligned along one
branches 86 and 81 having their ends anchored
_
i
r
The slip scraper bucket 33 is of generally con-.
side of the anchor plate 80 provide a series of
mounting positions for the back stay anchor‘ I28
at the top of the mast. The disposition of the.
anchor plate 89, and particularly the alignment
bucket is lifted to an elevated position. A manu
of the series of back stay anchor mounting aper
ally operable handle 92 adjacent a rear guiding; 10 tures I29, are such that movement of the back
handle 93 on the bucket is provided for actuation
stay anchor along the series of openings varies‘,
the eccentricity of the back stay anchor with re
of the trip‘ mechanism 90 to affect release- of the‘
bucket for dumping the contents into the truck.
spect to the axis, of; the vertical leg ‘I5 and the
ventional construction, including a trip mecha_-.
nism 90 to which the hoisting line 38 is connected
through the coupling 39 and through which the
Referring again. to Figs, 6 to 9:, the lifting.
structure of the truck leader, by‘ which the slip! 15.
scraper bucket; or other load‘ carrying device is
hoisted at the side- of- the truck and then swung
inwardly over the truck body, includes awbull
wheel
wardly94.projecting
carried bycircular
a bearing
bearing
collar portion;
95 on an9,6 of 20
the ?anged main support member ‘I2. The hear‘.
ing collar 95 is Split along its longitudinal center
to proyidebearing halves 9.1 and 98 secured to,‘
inor collar 95 in a direction longitudinal of the
substantially ‘ semi-circular parallel plates I96
ing‘the load to rest or to‘a‘state of slow motion
bearing collar 95...
In the preferred form. of the invention. which
is, disclosed, the back; stay anchor mountingapere
tures I629“ are displaced from, the aXis of the bear—
truck; while the aligned apertures are displaced
at various distances from the axis of the bears
ing- collar in a direction transverse to, the truck.
The result offsuch displacement of the back stay‘
anchor is to vary the center‘ of the radius of
gether byv fastening means, such as bolts 99-, in
movement of the upper portion of the boom rel-1
suitable bosses I99 on the sides of the bearing 25 ative to the center of movement of the lower;- end
halves. A greasing ?tting I92. (Fig. 6) is de
of’ the boom. The. resulting action is that as the
sirably provided on one of the bearing halves for
boom swings; inwardly beyond a predetermined
the, lubrication oiothe bearing surfaces. The.
position and towardthe position‘ indicated in dot
axial, load of the hoisting structure on the bull
and dash linesat 135,04- in Fig. 2; the eccentricity of
wheel 94 is carried. by an ‘end bearing surface I199
the‘ center :ogfv movement of the‘ upper portion of
proyided by ?anged ends I94 on the bearing
the boom relative to the centerof swinging movehalves and co=acting bearing surface on the
ment of‘ the boom causes the boom and the. load
?ange. of the main. support ‘I2, The otherv end
carried thereby to be raised during the progress
ofthe bearing collar 95- is retained by a ?anged
ormovement, with airesultth-atthe inward move
end [05. on, the. main support member ‘I2.
ment is increasingly resisted. This resistance to
the inward‘moyement of the boom aids in bring;
The bull wheel 94 includes'a pair of spacedand
and I01 secured to the bearing half 98v by weld
at a convenient position for dumping the load
into the truck body. The adjustment of the
ing, as at I958, and disposed in planes substan
tially perpendicular to the axis of the-bearing‘ 420. amount, of eccentricity by movement of the back
collar 95. Along the ?atedges of the semi-ci-re _ stay anchor I28 along the series of openings
makes possible the setting of the resistance to
cular plates I96 and I81 and extending outward
ly from the bearing half 98 arevertical reinforc
inward movement to an amount suitedto the load
and disposition of the loader. It is pointed out
ing plates‘ “19 and IIII
overlap: the flat
edges and are secured to the. plates, as by ‘weld ll : that; in. any instance the‘ resistance» to..in,ward
movement effected by the-raising of the boom and
ing. Intermediate the plates I96 and I91, and
load is proportional to the Weight of the load.
with’ their axes disposed in substantially’ con
A coil spring I30 surrounding- the lower por-v
centric relation with» respect to thel axis- o-f_ ‘the
bearing collar; 95-, is a; series of grooved ‘pulleys
tion- of the vertical leg ‘I51 provides a biasing force
H2, II3'and I14, each of which is rotatable! sun-- '" . resisting’ inward swinging’ movement of the boom
ported by aheaded pin I I5 held in place- byrmeans,
35 and urging the; boom about the axis of bearing‘95 to a position in which itlextends outward-l
such as retainer plate II6; secured to the outer
surface; Qf the plate I96 by cap; screw II'I.‘ ,‘A
pair of parallel and_ Spaced upright. boom support;
1y ‘over, the side of;v the, truck‘, Oneend of the.
spring I30. is; anchored to the, vertical leg 15 by
plates II B. and I [-9y are respectively‘ secured to and
fastening means. such as a 'bolt- I32; while the
other end‘ of the, spring is connected to a lug, I3J3=
extend outwardly from the reinforcing; plates: I09
and H9, andare also secured toand extend upe
wardly from the upper surface. of the bull wheel
plate I36. These boom support plates H8 and
on theside ofithe bearin‘g‘h'alf 98.
.
‘
In the plane of the bull wheel 94 and extend,
' ing awayirom the ?at edge thereof onv one side.
‘ I I9. have journaledtherein a boom support shaft 60 of the bearing collar 95‘is a support plate‘ I31’;
IZQ. which is substantially parallel to the surface
having one end secured to the vertical reinforcing
of the bull wheel plate‘ I98 and‘ perpendicular to‘
the» axis of the bearing collar 95. The shaft I29
alsov extends through a pair of‘- plates I22 and I23,
secured. to the lower end of the boomed‘ and lit;
ting between the boom support plates-H378 and
I I9_,_to carry the lower end of the boom for swing
ing movement about the axis, o_f_='the shaft. I 29. I
‘boom 35 is’preferably rectangular in sec.»
tionanu of; a hollow box-tyre construction; hav
its- upper, end I24 curved outwardly V away
fromthe mast Thebcomlissheld in; its upwardly
and outwardly extending position relative to the
plate I99. ‘Along the inner edge of the support
plate I34. and secured thereto, as well’ as: to the
vertical‘ reinforcingplate III-9; is a. second verti
cal reinforcing plate I135‘; This second vertical
reinforcing plate I35 carries at its outer end, a.
latch guide block I136, which has a slot there?‘
through and in which one end‘of a latch- bar I312
mounted for longitudinal: sliding movement.
The other end of the latch bar i317 (Figs; 6 and:
7)‘ is rotatably connected to and carried by one
arm of a bell. crank I38‘.
A fixed support upon.
which the bell crank is‘ mounted‘ fOr rotational:
movement'is provided by.v abolt I35 or Oth?ll‘Sllltr
axis or the-shaft I20; by- a; ?exible; connection,
suchas thetprqvided by aehain. I225, which chain’ 75 able means carried by» the secondE reinforcing
2,409,398
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,
plate I35. Rotational movement of the bell crank
I38 about the ?xed ‘axis of the bolt' I39 e?ects
longitudinal movement of the latch bar I 31 to
ward and from a latch plate I40 which is secured
to the inner frame 55.
‘
The latch plate I40 (Figs. 6 to 9, inclusive) is
8
,
about- the axis of the pin I49 in an upward direc
tion swings the bell crank I38 to withdraw the
latch.
Since the hoisting line-38 passes through the -
slot I54 in the extending end of the trip lever
extension, automatic operation of the trip lever
and the resulting release of the latch bar are ef
fected at a predetermined raised position of the
load by a cable clamp I 51 which is secured to
10 the hoisting line at a predetermined adjustable
position. In order to avoid damage to the latch
reinforced and secured in a position in alignment
with the end of the latch bar I31 and spaced from
the inner frame 55 by an intermediate plate I42.
The inner edge of the latch plate I40 is substan
tially arcuate in shape and concentric with re
spect to the axis of the bearing collar 95. Notches
I43 and I44 in the latch plate I40 at spaced po
sitions along the arcuate inner surface are
adapted to receive the end of the latch bar I31 w Cl.
to hold the bull wheel and boom in predeter
mined ?xed positions about the axis of the bear
ing collar 95.
' As shown in Figs. 8 and 9, the stop bar I45 is
removably secured to the upper surface of the :20
trip mechanism, which might be caused by over
running the latch releasing position ofv the trip
lever I48, the block 36 provides a_ stop which will
be engaged by the latch trip lever extensiomas
indicated in dot and dashlines I 5_2_a in Fig; 5,
latch plate‘ I40 adjacent one edge of the notch
when carried to such position by movement of
the cable clamp I51 to the position indicated at
I 51a. During the operation of the loader, the
hoisting line 33 is free to move to various.‘ posi
tions without disturbing the operation of the
I43 by means such as ‘bolts I46. This stop bar
latch trip mechanism, since tl’lGhOiStlllg linemay
in the position shown in Fig. 8 projects inward
ly vbeyond the arcuate edge of the latch plate I40
a distance su?i'cient thatthe end of the latch bar
I31 cannot pass the‘ end of the stop bar even
when the latch bar is retracted by‘moveinent of
the bell crank I38. This establishes the normal
move in the slot I54 and the trip‘ lever extension
may swing in a horizontal plane about the ‘axis
of the bolt I53 to follow the hoisting line.
' A direction changing pulley I58 for the hoist
ing cable 38, as shown in Figs. 8 and 9, is rotatably
supported on a shaft I59 carried by a pair of
locked position of the bull wheel to that shown in
spaced parallel plates I60 near one end'of the
Figs. '2 and 8 wherein the boom extends rearward 30 bull wheel and adjacent the outer edge of the sup
ly of the truck at an angle which may be, for ex
ample, approximately 45°. However, when the
loading operations make it desirable, the stop bar
I45 may be moved to the position shown in Fig. 9
port plate I34. The paralle1 plates I60 are suite
ably supported at their opposite ends for swing
ing movement transversely of the plane of the
pulley by and between the; vertical reinforcing
plate I09 and a vertical support plate I62 which
is desirably removably secured to and carried by
the support plate I34.- The pulley I58 is in a po
by loosening the bolts I46 and shifting one of
the bolts to an aperture I4‘! in the latch plate. In
this position the stop bar covers the notch I43 and
thereby prevents the end of the latch bar from en
sition at the edge of the bull wheel such that the
tering that notch. In this instance, the latch bar
hoisting cable 38 extends directly thereto from
I31 co-acts with the notch I44 to establish the 40 the pulley 36 at the end of the boom, and thence
locked positions of the bull wheel and boom to that
around the pulley I58 to the pulleys H2, H3 and
shown in Fig. 9 in which position the boom ex
H4 of the bull wheel. The hoisting cable 38 ex
tends outwardly practically at right angles to the
tends from the bull wheel pulleys through an
side of the truck.
eyelet I63 on the outer frame 40 across the truck
Operation of the latch bar I31 to effect disen ~15 body and over the pulley 31 to the winding drum
gagement of the latch bar from one of the notches
26. The block 36 is desirably‘mounted for swing_
I43 or I44 may be effected by manual movement
ing movement by a ring connection I 64 at the end
of the bell crank I38 or automatically by a latch
of the boom so that it is free to follow the move
trip mechanism shown in Figs. 3 to 6, inclusive.
ments of the end of the hoisting line 38; while
The latch trip mechanism includes a trip lever 50 the block 31 is movably carried by a supporting
I48 rotatably supported near' the extending end
ring I65 on an extension plate I66 at the end
of‘ the boom 35 by a pin I49 extending through
of the support frame 40. -
'
brackets I50 on one side of the boom. Carried
The force necessary to lift the load is thus
at the free end of the trip lever I48 is‘ a trip lever
transmitted through the hoisting line 38 around
extension I52 having one end secured to' the trip 65 the pulleys II2, I I3 and H4 on the bull wheel
lever for swinging movement in a plane substan
which are equi-distantly spaced from the axis of
tially parallel to the axis of the trip lever sup
the bearing collar 95 about which the bull wheel
porting pin I49 by means such as a bolt I53. The
and boom are adapted to swing. This force
other end of the trip lever has a slot I54 through
transmitted through the hoisting linearound the
which the hoisting cable 38 passes. At a distance
bull wheel pulleys exerts a force upon and
from the pin I 49 the trip lever I48 has rotatably
through the bull wheel which is dependent upon
connected thereto one end of a link rod I55 which
the lifted load and the disposition of the boom
extends downwardly along the boom to the bell
and which tends to'turn the bull wheel in ‘a
crank I38. The lower end of the link'rod I55 is
direction to swing the boom" inwardly to a posi
connected to the arm of the bell crank by means 65 tion over the truck body. In' other words, the
such as a pin I56. As shown in Figs. 6, 8 and 9,
force transmitted through the portion of the
it is particularly desirable that the‘ axis of the pin
hoisting line on the outside of the bull wheel
I56 is in substantial alignment with the axis of
nearer the pulley 26 exerts a component of force
the boom supporting pin I20 so that the swinging
tending to rotate the bull wheel in one direction.
movement of the boom about the axis of the pin 0 > In normal operation, the latch mechanism
I20 does not effect operation of the latch bar I3'I
holds the boom in one of the predetermined ?xed
by movement of the bell crank or even vary the
positions in which it extends outwardly over the
position at which the trip lever will effect release
side of the truck. While held in one of these
of the latch bar I31 from one of the notches of
?xed positions force applied through the hoisting
the latch plate. Movement of the trip lever I48
linev moves that. hoisting line over the-seriesof
13,409,398
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‘10
pulleys to raise the load to ‘a desired level. In
the present instance, the desiredlevel is such that
the slip scraper bucket may be freely swung in?
wardly over the side of thetruck. Upon reaching
?ange I14 is closed at its outer end by a plate I15
secured thereto as by welding at I15. Extending
from the plate ‘ I15, and axially with respect to
the wheel 24, is a spindle I11 which serves as a
such a level the cable clamp I51 engages the
latch trip extension I52 to effect release of the
latch bar £31 from its co-acting notch in the
support for the winding drum and a portion of the
.latch plate I49, whereupon. the boom and load
projecting spindle I11 and is held in place on the
are swung inwardly by the component of the
load carrying force which is exerted upon the
spindle between a shoulder I1?) and a snap ring
I89 which fits in a peripheral groove I82 in the
one side of the bull wheel.
‘Since the hoisting line 38 extends in prac
tically a semi-circle around .the bull wheel 94',
and because the bull wheel moves with the boom,
outer end. of the spindle. An annular bearing
housing I83 is carried by the outer race of the
drum driving mechanism.
A. bearing I18 has its inner race mounted on the
vbearing HE and has at its inner end an oil seal
I84; while the outer end of the bearing housing
the components of force tending to rotate the 15 is closed by a .cap i165 and carries an annular sup
port plate 1185, both of which are secured thereto
bull wheel and swing the boom inwardly remain
by cap screws I81, ‘On its periphery the annular
practically constant‘ throughout the entire range
support plate 185 carries a closure drum I88 of
of the swinging movement of the boom. The
slightly larger diameter than that of the plate
torque applied through the bull Wheel which pro
duces the inward swinging movement of the boom 20 :15, which drum extends inwardly over the edge
of the plate I15 to form an outer closure for the
is increasingly. resisted, as previously explained,
driving mechanism. The winding drum 35 is
by the opposed biasing force of the spring we
carried in radially spaced relation to the closure
and the. raising of ‘the load resulting from the
drum Ir88 by an annular web I89, which web has
adjusted position of the back stay anchor I28.
The ‘upper end of the boom swings in ‘a non 25 secured to the outer plane surface thereof, by a
cap screw I199, a suitable cable clamp I92 for
arcuate path, as indicated by the dot and dash
holding the :end of the hoisting line 38. The
line L61 (Fig. .2), as distinguished from an arou
cable clamp I92 .is desirably adjacent an opening
ate path indicated by the dot and. dash line I68
I93 .in the face ‘.of the drum 2E, through which
which would be followed if the back stay anchor
‘I29 were ‘co-axial with the axis of the bearing 30 the hoisting cable 38 extends. Also, suitable
brackets, such as 194, are preferably secured to
95.. Adjustments effecting an appropriate bal
the outer plane surfaceof the web I89 tosupport
ance of the opposed forces at a desired position
the extending loose end of the hoisting cable.
of the load over ‘the truck materially. aid in the
From the portion of‘ the structure of the drum
rapid operation of the loader and the dumping
driving mechanism ‘which has been thus far de
.of the load at a desired position in the truck.
scribed, it may be understood that the adapter
When the truck is to be used for hauling ‘the
?ange I10, extension ?ange I14, plate I15 and
load to a place for dumping, and during any
spindle ‘I11 are positively driven by the wheel 24,.
movements of the truck in which it is unneces
However, the winding drum, being supported from
sary to dismount the loader, the drag line 34 is
disconnected from the drag‘ bar and the. hoisting 40 the bearing I18 through the annular support plate
I86 and the web I89, is separately and inde
line is disconnected from the slip scraper bucket.
pendently rotatable with respect to the spindle.
The other end of the hoisting line remains con
Toaccomplish the driving of the winding drum,
nected to the‘ drum 26, but the, driving connec_
for the method of operation preferred in this in
tion to the drum is. released. The free end of
stance, a ratchet mechanism, including a ratchet
the hoisting line is then pulled to the side of the
ring I95 and pawl I95, provides a driving connec
truck opposite that upon which the, boom is
tion between the plate I15, connected to the wheel,
mounted. While the latch bar I31 is manually
and {the support plate I85, connected to the, wind
released from the latch‘plate M0,, sufficient force
ing drum, during rotation of the wheel in One
is manually applied to the free end of the hoisting
direction. ‘In this instance, the direction of re
cable to draw the boom inwardly over the truck
tation of the wheel for driving the winding drum
body against the biasing force of the spring 139..
is that which produces rearward motion of the
,One end of the hoisting line being anchored to
truck, By preference, the ratchet ring I95 ‘is so
cured to the plate I15 for driving purposes
through a frictional safety release clutch which,
in an emergency, will permit the ratchet ring to
the winding drum, the other end is secured to a
member L59 at the end of the outer frame 451
so that the boom will be held in the position
inwardly of the truck body. During such opera
tions, the drag bar 29 is dropped to theside of the
truck by releasing the chain 32 and anchoring
link ‘39 under hook I1 I.
‘
In the preferred embodiment of the invention,
illustrated in the drawings, the loadhoisting force
is preferably acquired byattachment of the-wind
ing drum 25' to the wheel ‘24, .of- the truck andcon
trolling the operation ‘of the drum ‘through Icon
50
trol'of its driving connection to thewheel and .
appropriate movements of the truck. The struc
ture of one ‘form of winding drum and its ac
companying operating parts are illustrated in
Figs. 3 and 10 to 13; inclusive.
As shownin Figs. .31 and 10, the winding drum
25 is supported in ‘proper spaced relation to the
wheel 24 by an adapter ?ange l1Il,_,having one end
secured to the wheel by vhub bolts ‘.I 1.2, and having
secured to its other end, by means such as bolts
I13. an. extension ?ange I14-
Tlre extension
slip relative to the plate I15. This friction clutch
includes rings of friction material I91 secured to
opposite surfaces of an inwardly projecting ?ange
I98 on a flanged ring I99, which ?anged ringis
secured in concentric relation ‘to ‘the outer sur
face of the plate I15 by cap screws 20!]. The op
positeiaces- of the friction rings I91 are adjust
ablv clamped between rings 262 and 203 which
are drawn together against the frictional surfaces
and secured to the inner surface of the ratchet
ring I 9.5 by canscrews 204.
A shaft 205 is rotatablysupported near the outer
edge of the annular support plate I86 .bylthat plate
and a lug 205 projecting radially inwardly from
the inner surface of the closure drum I88. jAt its
outer end the shaft 295 has secured thereto a
pawl control handle ‘201,, which handle is man
ually movable to either of two operating positions
and :latchable in those ,positions by a sector 208
11
22,409,398
'12
secured to the outer surface of the cap‘ I85 by
the boom 35. This relative disposition of the
boom and winding drum tends to equalize the
means such as cap screws 269. Notches 2H] and
2“ in the sector 208 hold the handle 20'! in the
position to which it is manually set; the resilience
stresses on the body of the truck during the lift
ing operation and thereby limits the tendency
toward twisting of the body which would result
from having the stresses carried entirely at one
of the handle permitting its movement from one
notch to the other and holding the handle in place
in either of the notches.
side of the body; that is, with the disclosed ar
The pawl I96 is rotatably carried by the shaft
rangement of parts, the load lifting tension in the
265 between the annular plate I86 and the lug
hoisting line is downward on the drum side of the
206 in alignment for engagement with the teeth 10 truck body and is also downward on the boom side
of the ratchet ring I85. A pin 2I2 carried by the
of the truck body.
shaft 205 projects radially outwardly therefrom
It is likewise notable that with this arrange
through a substantially semi-circular slot 2I3
ment of parts wherein the boom extends over the
in the pawl I96. The position of one end of the
side of the truck and the winding drum is on the
slot 2 I3 relative to the pin 2I2 is such that when
opposite side of the truck, any tendency of the
the handle 28'! is disposed in the notch 2 ID of the
truck to tip, due to excessive load, will not result
sector 208, the pawl is held away from the ratchet
in the loss of the lifting force by virtue of a loss
ring I95, as shown in Fig. 11. In this position of
of traction on one set of wheels caused by the
the handle 20‘! the Winding drum 26 is freely
action of the truck differential; that is, lifting of
movable with respect to the wheel 24. The length 20 a load increases the normal force and tractive ef
of the slot 2I3 and the movement of the handle
29'! from the notch 2I9 to the notch 2| I are sul?
cient that when the handle is disposed in the
notch 2I I, the pawl is movable to clear the teeth
of' the ratchet ring I95 and is biased into engage
ment with these teeth by a leaf spring 2 I 4, having
one end secured to the pawl and its other end pro
fort of the wheel 25 on the boom side of the truck
and thereby reduces the tendency for that wheel
to slip. Tendency toward slippage of the wheel
24 is reduced by the load applied through the
Winding drum, and even though slippage occurred
at the wheel 24, the load would be lifted.
In the operation of the disclosed truck loader.
the lifting of the load, the swinging of the boom to
jecting outwardly into engagement with the clo
sure drum I88. In the latter position of the op
a dumping position over the truck and the control
erating handle 20?, the winding drum is driven 30 of the swinging movement are all accomplished
through the ratchet ring and pawl upon move
ment of the truck wheel in one direction (during
with the use of only a single hoisting line and
without additional control or swinging lines to
complicate the structure or its operation. The
construction and arrangement of loader parts is
such that the single hoisting line extends across
the truck, so as to tend to equalize the forces on
the two sides of the truck body. While the boom
is locked in a ?xed position, the single hoisting
line lifts the load as the one end thereof is wound
around the winding drum in response to move
ment of the truck. When the load is raised to a
predetermined level higher than the side of the
rearward movement of the truck), although the
winding drum will not be driven during rotation of
the wheel in the opposite direction (during for
ward movement of the truck) .
From the foregoing description of the exem
plary winding drum driving mechanism, it may be
understood that placement of the handle 251 in
one operating position effects disengagement of
the pawl I96 from the teeth of the ratchet ring
I55, so that the driving mechanism is ineffective
for driving the winding drum during rotation
of the wheel 24 in either direction. However, with
truck, the cable clamp carried by the hoisting line
effects release of the boom holding latch so that
the handle 26‘! in the other of its operating posi- _
tions, the pawl I96 is biased into engagement with
the teeth of the ratchet ring I95 to provide a
driving connection between the winding drum and
the wheel 24 which is effective during the rear
Ward movement of the truck. With the hoisting ,
line 38 anchored to the web I89 of the winding
‘drum, as shown in Fig. 11, the winding of the
hoisting line upon the periphery of the winding
drum during the rearward movement of the truck
furnishes the force for lifting the loadto a posi
tion above the side of the truck and then swinging
the load inwardly over the body of the truck for
dumping, as described. Rearward movement of
the truck for effecting the winding operation of
the forces applied through the hoisting line to
the bull wheel exert a practically uniformforce
throughout the range of swinging movement to
swing the boom and load inwardly to a position
over the truck body for dumping. In order to
stop the boom at a desired position over the
truck body for dumping, the practically uniform
force which swings the boom inwardly is resisted
by the force of the spring I30 and the force neces
sary to raise the load as a result of the eccentric
position of the back stay anchor I28, both of
which forces increase as the load swings in
wardly. After the dumping of the load into the
truck, the relief of tension of the hoisting line and
forward movement of the truck permit the boom
60 to swing outwardly under the influence of the
the drum is preferred, since by the selection of a
proper size for the-winding drum, the truck will
spring I38 and the gravitational force resulting
move rearwardly to a position in which the boom
from the position of the back stay anchor. The
is over the load when the load is raised and after
boom is automatically latched again in its nor
which continued rearward movement lifts the
mal lifting position, and continued forward move
load to the desired level for swinging movement of 65 ment of the truck lowers the bucket to its posi
the load over the side of the truck. The subse
tion for receiving another load.
'
quent forward movement of the truck will again
While I have illustrated a preferred embodi
lower the slip scraper bucket or other load carry
ment of my invention, many modi?cations may be
ingr'deviceto practically the position from which
made without departing from the spirit of the
it was raised and from which position it is to be 70 invention, and I do not wish to be limited to the
reloaded.
precise details of construction set forth, but de
It is to be noted that in the disclosure of the
sire to avail myself of all changes within the
preferred embodiment of my invention the wind
scope of the appended claims.
I
ing drum 26 is mounted on the rear wheel 24 of
I claim:
v
the truck on the opposite side of the truck from 76
1. Truck loading apparatus adapted to be se
amazes
13
cured to the body of a truck and comprising, in
combination, a supporting structure adapted to be
mounted upon the truck body and including a
boom extending upwardly and outwardly at one
side of the truck body, said boom being supported 5
side of the truck, body, means. including a bull
for swinging movement from a normal position in
top of the boom substantially spaced thereabove,
which it extends laterally beyond the side of the
truck to a position‘ in which it overhangs the
side of the truck‘and supported byithe support
wheel supporting the‘ boom for swinging move
ment from a normal ‘position in which it extends
laterally beyond the side of the truck- to a position
in which it overhangs the truck body with the
a drag bar‘ extending laterally from the boom
structure‘, a scoop device, a drag line having one
end secured’to the outer end of the drag bar and
extending rearwardly of the truck with its other
end connected to the scoop device, a series‘ of
tr_u‘ck body with the ‘top of theboom substantial
ly spaced thereabove, a drag bar extending lat
orally from the boom side of the truck and sup
ported by the support structure, a scoop device, a
drag line having one end secured to the outer end
of the drag bar and extending rearwardly of ‘the
pulleys carried by the boom, bull wheel and sup
porting‘ structure, a winding drum carried by ‘a
truck with its other end connected to the scoop 15 rear wheel of the truck, a hoisting cable secured
at one end to the scoop device and vextending
device, a series of pulleys carried by the boom
upwardly therefrom to a pulley on the boom and
and supporting structure, a ‘Winding drum car~
thence downwardly to the pulleys on said bull
ried by a rear wheel of the truck on the opposite
wheel and through other of said pulleys ‘to the
side of the truck, from the boom, a hoisting cable
secured at one end to the scoop device and extend 20 winding drum, the other end of said hoisting
ing upwardly therefrom ‘to ‘a pulley on the boom
cable being secured to the winding drum, ‘and
and thence downwardly and across the truck
means adapted to drive said drum from the wheel
body ‘through other of said pulleys to the winding
when the truck moves in one direction to wind
drum, the other end of: said hoisting cable being
the hoisting cable on the drumvfor raising the
securedto the winding drum, and means adapted 25 scoop device, the tension in the hoisting cable
to drive said drum. from the wheel. when the
during lifting and applied to the pulleys on the
truck moves in one, direction to wind the. hoisting
bull wheel providing the turning force for swing
cable on the drum for raising thev scoop device,
ing the boom inwardly, the last mentioned means
thelast mentioned, means being ‘adapted to release
being adapted to release the drum during move;
the drum duringmoyement ofthe truck in the op 30 ment of the. truck in the ‘opposite direction so
posite direction so, that the scoop device. may be
that the scoop device ‘may be dragged by thedrag
dragged by‘ the drag line and drag bar.
line and drag bar.
'
2. Truck loading apparatus adapted to be se
1i. 'Truckloading apparatus adapted to be se
cured to the body'of a truck and comprising, in
cured to the body of a truck and comprising, ‘in
combination, av supporting structure adapted to 35 combination, a supporting structure adapted to
be mounted. upon the truck body and including
be mounted upon the truck body and including
a boom extending upwardly and outwardly'at one
a boom extending upwardly and outwardly at one
side of the truck body, means including a bull
side of the truck ‘body, means including a bull
wheel supporting the boom for swinging move
wheel supporting ‘the boom for swinging move
mentfrom a normal ‘position in which it extends 40 ment from a normalposition in which ‘it extends
laterally beyond‘ the side of the truck to a position
laterally beyond the side of the truck to a position
inv which it overhangs‘ ‘the truck body with the
in’ which it overhangs the truck body with the -
top of the boom substantially spaced thereabove,
top‘ of the boom substantially spaced thereabove,
a drag bar extendinglaterally from the boom side
spring means biasing the boom toward said nor;
of ‘the truck and supported by the support struc
‘45 mal position, a drag bar extending laterally from
the boom side of the truck and ‘supported by the
support structure, a scoop device, a drag line hav
tending rearwardly of the truck with its other end
ing one end secured to the outer end of the drag
connected to the scoop device, a series of pulleys
bar and extending rearwardly of the truck with
carried by the boom, bull wheel and supporting '50 its other end connected to the scoop device, a
series of pulleys carried by ‘the boom, bull wheel
structure, a winding drum carried by a rear wheel
and supporting structure, a winding drum‘ car
of the truck on the'oppositeside of the truck from
ried by a rear wheel of the truck, a hoisting cable
the boom, a hoisting cable secured at one end to
the scoop device and extending upwardly there
secured at one end to the scoop device and extend~
from to a pulley on the boom and thence down 65 ing upwardly therefrom to a pulley on the boom
and thence downwardly to the pulleys on said bull
wardly to the pulleys ‘onsaid bull wheel and across
wheel and ‘through other of said pulleys to the
the truck body through other of said pulleys to
winding drum, the other end of said hoisting
the winding drum, the other end of said hoisting
cable being secured to‘ the winding drum, and _ cable being secured‘to the winding drum, and
means adapted to drive said drum from the wheel ‘60 means'adapted to ‘drive said drum from the wheel
ture, a scoop device, a drag line having one end
secured to the outer endof the drag bar and ex
when the truck moves ‘in one direction to wind
when the truck moves in one direction to wind
the hoisting cable on the drum for raising the
the hoisting cable on the drum for raising the
scoop device, the tension‘ in the hoisting v‘cable
scoop device, the tension in the hoisting cable
during liftingand applied to the pulleys‘on ‘the
during lifting and applied to the pulleys on ‘the
bull wheel providing the turning force for swing 65 bull wheelproviding the turning force for swing~
ing the boom inwardly, the last mentioned‘ means
ing the boom inwardly, vthe last mentioned means
being adapted to ‘release the drum during move
being adapted to release the drum during move
ment of the truck ‘in the opposite direction ‘so
ment of the truck‘ in the opposite direction so
that ‘the scoop device maybe dragged by the drag
that the scoop device may be dragged by the drag
line and drag bar.
,
'
‘70 line and drag bar.
3. Truck ‘loading apparatus adapted to be se
cured to the body of a truck and‘comprising, ‘in
\
5. Truck loading apparatus adapted to be se
cured to the body of ' a truck ‘and comprising, in
combination, a supporting structure adapted to
be mounted upon the truck body and including
be; mounted upon the truck body and including
alboom ‘extending upwardlyand ‘ outwardly at one '75 a boom extending upwardly and outwardly ‘at ‘one
‘combination, a supporting structure adapted to i
2,409,398
'15
16
side of the truck body, means including a bull
wheel. supporting the boom for swinging move
movement in said one direction as such movement
progresses, a pulley at the upper end of said
ment from a normal position in which it extends
boom, and a hoisting cable extending through
the last mentioned pulley and co-acting with the
laterally beyond the side of the truck to a position
in which it overhangs the truck body with the
top of the boom substantially spaced thereabove,
a latch releasably holding the boom in said nor
bull wheel so that tension for lifting applied
through the hoisting cable exerts a force through
the bull wheel for swinging the boom about the
vertical axis in said one direction, the radius of
the bull wheel through which said force is applied
mal position, a drag bar extending laterally from
the boom side of the truck and supported by the
support structure, a scoop device, a drag line hav 10 being practically uniform throughout the range
ing one end secured to the outer end of the drag
of movement of the boom about the vertical axis.
bar and extending rearwardly of the truck with
8. In loading apparatus the combination of a
its other end connected to the scoop device, a
bull wheel supported for rotation about a vertical
seriesof pulleys carried by the boom, bull wheel
axis, an upwardly projecting boom supported at
and supporting structure, a winding drum carried 15 the lower end on the bull wheel and mounted for
byv a rear wheel of the truck, a hoisting cable
swinging movement about a [horizontal axis at
secured at one end to the scoop device and ex
said lower end, means anchored at one end for
tending upwardly therefrom to a pulley on the
supporting the upper end of said boom for swing
boom and thence downwardly to the pulleys on
ing movement about said vertical axis from and
said bull wheel and through other of said pulleys 20 to a normal position, and said one end of the
to the winding drum, the other end of said hoist
anchored means being eccentric to said vertical
ing cable being secured to the winding drum,
axis so that movement of the boom in one direc
latch actuating means carried by the hoisting
tion from the normal position about the vertical
cable for releasing said latch means at a pre
axis raises the upper end of the boom and thereby
determined position of the hoisting cable during 25 provides increasing resistance to movement in
lifting, and means adapted to drive said drum
said one direction as such movement progresses.
from the wheel when the truck moves in one
9. In loading apparatus the combination of a
direction to wind the hoisting cable on the drum
boom having its lower end mounted for swinging
for raising the scoop device, the tension in the
movement about adjacent vertical and horizontal
hoisting cable during lifting and applied to the
axes, a stationary mast extending upwardly ad
pulleys on the bull wheel providing the turning
jacent the boom, an anchor plate secured to the
force for swinging the boom inwardly, the last
mast, connector means adapted to be secured to
mentioned means being adapted to release the
ie anchor plate in any one of a series of posi
drum during movement of the truck in the oppo
tions varying in eccentricity from said vertical
site direction so that the scoop device may be 35 axis, and means connecting the boom to the con
dragged by the drag line and drag bar.
nector means to support the projecting end of
6. In loading apparatus the combination of’a
the boom, the eccentricity of the connector means
bull wheel supported for rotation about a ver
being such that the boom is raised during its
tical axis, an upwardly projecting boom supported
swinging movement in one direction about the
at the lower end on the bull wheel and mounted 4 O vertical axis to increasingly resist movement in
for swinging movement about a horizontal axis
said one direction as the movement progresses.
at said lower end, a series of pulleys rotatably
secured to the bull wheel in a common plane and
substantially equi-distant from said vertical axis,
10. In loading apparatus the combination of a
boom having its lower end mounted for swinging
movement about adjacent vertical and horizontal
axes, latch means at the lower end of the boom
for releasably holding the boom in a normal posi
means anchored at one end for supporting the Y ;
upper end of said boom for swinging movement
about said vertical axis, means biasing the boom
tion about the vertical axis, a latch release arm
to a normal position, said one end of the anchored
movably supported at the upper end of the boom,
means being eccentric to said vertical axis so
link ‘means including a member rotatably sup
that movement of the boomin one direction from "50 ported on an axis in substantial alignment with
the normal position about the vertical axis raises
said horizontal axis providing an actuating con
the upper end of the boom and thereby provides
nection between the latch release arm and latch
increasing resistance to movement in said one
means which is relatively unaffected in operation
direction as such movement progresses, a pulley
by the position of the boom about the horizontal
at the upper end of said boom, and a hoisting axis, a pulley carried by the upper end of the
cable extending through the last mentioned
‘boom, a hoisting cable extending through said
pulley and around the pulleys on the bull wheel
pulley, and means carried by the hoisting cable
for actuating the latch release arm.
11. In loading apparatus the combination of a
so that tension for lifting applied through the
hoisting cable exerts a force through the bull
wheel for swinging the boom about the vertical
axis in said one direction.
I
7. In a loading apparatus the combination of
a bull wheel supported for rotation about a ver
tical axis, an upwardly projecting boom supported
at the lower end on the bull wheel and mounted ,
boom having its lower end mounted for swinging
movement about adjacent vertical and horizontal
axes, latch means at the lower end of the boom
for releasably holding the boom in a normal posi
tion about the vertical axis, a latch release arm
movably supported at the upper end of the boom
for swinging movement about a horizontal axis
and link means including a member rotatably
supported on an axis in substantial alignment
supporting the upper end of said boom for swing
with said horizontal axis providing an actuating
ing movement about said vertical axis, means
connection between the latch release arm and
biasing the boom to a normal position, said one 70 latch means which is relatively unaffected in
end of the anchored means being eccentric to
operation by the position of the boom about the
said vertical axis so that movement of the boom
horizontal axis.
in one direction from the normal position about
12. In loading apparatus the combination of a
the vertical axis raises the upper end of the boom
supporting base, a boom having its lower end
at said lower end, means anchored at one end for
and thereby provides increasing resistance to 7.5 mounted for swinging movement relative to the
254083398
17
181
base about adjacent vertical ‘and horizontal axes,
end seo'ure‘d thereto, said ‘spring biasing the boom
a latch plate carried by the base, latch means at
the lower ‘end of the boom and adapted to engage
the. latch platereleasably to hold the boom in
a. normal ‘positionpmeans “for changing the posi
about said axis toward a normal operating. posi
tion, a' pulley carried by the boom, and a’ hoisting
cableie‘xtending' over the pulley, the ends of the
hoisting ‘cable being ?xedly anchored to hold the
boom in‘ an inoperative position‘ against the bias-v
tion of engagement of the latch means with the
latch plate to change the normal position of the
ing" force-of thespring.
.16: In loading apparatus adapted to be mount
boom, a pulley carried by the upper end of the
boom, a latch release arm'movably carried at
the upper end of the boom and having-a. slotted
portion below said pulley, a hoisting cable ex
tending through the slotted portion of the latch]
release arm and said pulley, means carried by.
the hoisting cable below the latch release arm for
actuating the latch release arm, said pulley serv
ed on a. truck‘body, ‘thecombination of a base‘
adaptedv to extend laterally ‘across'the truck‘body
andtobe ‘secured thereto, a boom mounted at one
end of the ‘base and extending upwardly and out
wardly‘t‘o a position beyond‘the side-‘of the body,
a 'pulieyha't the upper. end of the boom, plulleys
mounted on the base in spaced relation laterally‘
or'ilhe truck body, a winding drum mounted on-a
rear wheel of the truck on‘ the side of the truck
ing as a stop to limit movement of the latch re
lease arm, and means operatively connecting the
latch'release arm to said latch means,
13. In loading apparatus the combination of a
being aligned with the drum, and a hoisting cable
carried by said pulleys and having one end se
supporting base, a boom having its lower end 20 cured to the winding drum, the other end of the
cable serving to suspend a load carrying device
mounted for swinging movement relative to the
base about adjacent vertical and horizontal axes,
from the boom, 1e lifting tension in said cable
latch means at the lower end of the boom and
exerting downward forces on opposite sides of the
adapted releasably to hold the boom in a normal
body tending to balance the body stresses.
17. In loading apparatus including a hoisting
position, a pulley carried by the upper end of 25
cable and adapted to be mounted on a truck hav
the boom, a latch release arm movably carried
at the upper end of the boom and having a slotted
ing wheels, the combination of an extension
portion below said pulley, a hoisting cable ex~
?ange secured concentrically upon the outer sur
tending through the slotted portion of the latch
face of one of the truck wheels and extending
release arm and said pulley, means carried by the 30 outwardly therefrom, a winding drum rotatably
hoisting cable below the latch release arm for
supported on the outer end of said extension
actuating the latch release arm, said pulley serv
?ange and concentric therewith, ratchet means
ing as a stop to limit movement of the latch re
including a ratchet ring secured to said extension
flange and a coasting pawl mounted on said
lease arm, and means operatively connecting the
latch release arm to said latch means.
35 winding drum for movement into and out of en
gagement with the ratchet‘ ring, means biasing
14. In loading apparatus the combination of a
the pawl into engagement with the ratchet ring
supporting base, a bull wheel supported on the
for connecting the winding drum to the exten
base for rotation about a vertical axis, a boom
sion ?ange to drive the winding drum in one
extending angularly upwardly and having its
direction, a manually operable handle, means
lower end mounted on the bull wheel for rotation
‘connecting said handle to said pawl so that the
about a horizontal axis, a mast secured to the
pawl is held away from vthe ratchet ring when
base and extending upwardly adjacent the boom,
the handle is in one position and is free to coact
?exible means connecting the boom to the mast
with the pawl when the handle is in another
to support the upper end of the boom, pulleys
position, and means holding the handle in each
carried by the base and the upper end of the
boom, a hoisting cable carried by said pulleys
co-acting with the bull wheel, said hoisting
of said positions,
cable having a load carrying end extending
downwardly from the pulley at the upper end of
a bull wheel supported for rotation about a ver
supporting base, a stationary mast secured to the
base and comprising a tripod structure having a
wheel so that tension for lifting applied through ‘
-
18. In a loading apparatus the combination of
tical axis, an upwardly projecting boom sup
the boom and another end to which lifting force 50 ported at the lower end on the bull wheel and
is applied, releasable latch means for holding the
mounted for swinging movement about a hori
boom in a preselected position relative to said
zontal axis at said lower end, a stationary mast
extending upwardly adjacent the boom, an an
vertical axis, said co-action between the hoisting
cable and bull wheel being such that tension ap
chor plate secured to the mast, connector means
plied through the hoisting cable exerts torque 55 adapted to be secured to the anchor plate in any
through the bull wheel tending to swing the boom
one of a series of positions varying in eccen
tricity from said vertical axis, means connecting
in one direction about the vertical axis from said
preselected position, latch release means movably
the boom to the connector means to support the
projecting end of the boom, the eccentricity of
carried by the boom and connected to the re
leasable latch means, and means carried by the 60 the connector means being such that the boom is
hoisting cable for engaging the latch release
raised during its swinging movement in one direc
means at a predetermined position of the hoist
tion about the vertical axis to increasingly resist
ing cable to actuate the latch release means and
movement in said one direction as the movement
thereby to effect release of the latch means so
progresses, a pulley at the upper end of said boom,
that the boom is swung by said torque.
65 and a hoisting cable extending through the last
15. In loading apparatus the combination of a
mentioned pulley and coacting with the bull
substantially vertical leg, a boom extending an
the hoisting cable exerts a force through the bull
wheel for swinging the boom about a vertical axis
70 in said one ‘direction, the radius of the bull wheel
gularly upwardly adjacent the mast, means sup
porting the lower end of the boom for swinging
movement‘about the axis of said vertical leg,
means swingably anchoring the upper portion of
the boom to the mast, a torsion spring surround
ing a portion of the vertical leg and having an 75
through which said force is applied being practi
cally uniform throughout the range of movement
of the boom about the vertical axis.
‘
19. In a loading apparatus the combination of
a bull wheel supported for rotation about a ver
2,409,898
19.
20‘
tical axis, an upwardly projecting boom support
sion for lifting applied through the hoisting cable
ed at the'lower end on the bull wheel and mount
ed for swinging movement about a horizontal axis
exerts a force through the bull wheel for swinging
the boom about a vertical axis in said one direc
tion, the radius of the bull wheel through which
atsaid lower end, a;,.stationary mast extending
upwardly adjacent the boom, an anchor plate
said, force is applied being practically uniform
secured to the mast,,connector means adapted to
be secured to the anchor plate in any one of a
throughout the range of movement of the boom
about the vertical axis, a latch means at the
series-of positions varying in eccentricity from
lower end of the boom for releasably holding the
boom in a normal position about the vertical axis,
totheconnector means to support the projecting 10 and a latch release arm movably supported at
end of the boom, the eccentricity of the connector
the upper end of the boom and link means includ
means being such that the boom is raised during
ing a member rotatably supported on an axis in
its swinging movement in one direction about the
substantial alignment with said horizontal axis
vertical axis to increasingly resist movement in
providing an actuating connection between the
said one direction as the movement progresses, 15 latch release arm and latch means which is rela
a pulley at the upper end of said boom, a hoisting
tively una?ected in operation by the position of
cable extending through the last mentioned pul
the boom about the horizontal axis.
ley and coacting with the bull wheel so that ten
ROBERT C. SHOEMAKER.
said ‘ vertical axis, means connecting the boom
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