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Патент USA US2410965

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Nov. 12, 1946.
,
H, N, DMCK
2,410,965
LOAD HOIST AND GRAPPLING CONTROL
Filed Nov. 16, 1943.
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NOV. 12, 1946.
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2,410,965
LOAD HOIS'I' AND GRAPPLING CONTROL
Filed Nov. 16, 1943
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Nov. 12, 1946.
H, N, DMCK
2,410,965,
LOAD HOIST AND GRAPPLING CONTROL
Filed Nov. 16, 1943
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Nov. 12, 1946.
H. N. DIMICK
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LOAD HOIST AND GRAPPLING CONTROL
Fi‘led Nov. 16, 1943
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HENRY NOEL pm K
Nov. 12, 1946.
H. N. DIMICK
2,410,965
LOAD HOIST AND GRAPPLING CONTROL
Filed Nov. 16, 1943
5 Sheets-Sheet 5
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INL/EN 717R
I
v-TURNEV
Patented Nov. 12, 1946
UNITED STATES‘ PATENT OFFICE,
,_
2,410,965
_
LOAD nors'r AND GRAPPLING CONTROL
Henry N., Dimick, Portland, 0reg., assignor to
Willamette Hyster Company, Portland, 0reg.,
a corporation of Oregon
-
Application November 16, 1943, Serial No. 510,571
9 Claims. (Cl. 214-65)
1
This invention relates to that class of automo
tive vehicles known as straddle trucks, used pri
marily for the transportation of loads such as
stacks of lumber, boxed or crated shipments and
the like, which are carried beneath the frame of
the truck and between the wheels in straddled
‘position. More particularly, the invention relates
2
to be carried, for operating the hoisting mecha
nism to raise or lower the load, and for applying
braking means to hold said hoisting mechanism
..
0
in any desired position within‘ the limits of the
hoist travel, the several functions of which me
chanism are under control of a single control
lever element.
to a new and novel arrangement of elements for
It is a further object of the invention to provide
controlling operation of the load grappling equip
in a straddle truck an improved mechanism for
ment.
10 moving the load grappling shoes into and out of
Straddle truck are designed to overrun a load,
pick it up and carry it beneath the frame of the
truck and between the wheels in straddled posi
tion. Each truck is provided with grappling
means called “shoes” for engaging and carrying
the load. In the instant invention the shoes are
mounted upon swing posts mounted at each side of
the truck midway between the front and rear
wheels. The upper ends of the swing posts are
load engaging position.
It is a further object of the invention to pro
vide an improved mechanism on straddle trucks
for controlling the operation of a friction drive
between the prime mover and the lifting mecha
nism.
It is a further object of the invention to provide
in a straddle truck means for increasing the use
fulness of the truck and to provide a truck capable
interconnected by a rod which, though being ex 20 of e?icient operation even in the hands of un
tensible for purposes of initial adjustment, pro
skilled operators.
vides ?xed points about which the posts swing
In the drawings: Figure 1 is a top plan view of
to move the shoes between load engaging and
a straddle truck embodying the invention; Figure
disengaging positions. Each of the swing posts
2 is a side elevation of the straddle truck shown in
is provided with trunnions journaled in a slide
Figure 1; Figure 3 is a sectional elevation taken
mounted for limited movement transversely of 25 transversely of the truck on the line 3—-3 of
the truck frame, and means is provided for im
Figure 1, showing the construction of the means '
parting movement to each of these slides simul
for supporting the load; Figure 4 is a plan view,
taneously in response to a control mechanism
partly in section, of the means for moving the load
actuated by means of an operating lever in the
supporting elements into and out of engagement
operator’s compartment.
with a load, taken on the line 4—4 of Figure 3;
A load hoisting mechanism is provided compris
Figure 5 is a'fragmentary sectional view, taken
ing lift chains trained over drive sprockets which
on the line 5——5 of Figure 3; Figure 6 is a top plan
are operatively connected by suitable shafts and
view, partly in section, of the friction drive for
gearing to a friction drive mechanism through
operating the lift chains; Figure 7 is a section
which power is transmited from a prime mover.
taken on the line 'l---‘! of Figure 6; Figure 8 is a
The friction drive is actuated by means of vacuum
longitudinal sectional elevation of the friction
power devices under control of valve mechanism
drive, taken on the line 8-8 of Figure 6; Figure 9
operated by a lever interconnected with the afore
is a sectional elevation taken transversely of the
mentioned operating lever in the operator’s com
40 straddle truck on the line 9—9 of Figure 8; Figure
partment. By reason of this construction, con
10 is a diagrammatic representation of the control
trol of all of the various functions of the hoisting
elements for the friction drive; Figure 11 is a
mechanism is had‘ through the manipulation of
longitudinal elevation taken on the line 7| |-—I l of
but one lever mechanism.
Figure 1 and showing the construction of the
It is, therefore, an object of the invention to
mechanism for raising and lowering the load;
provide in a straddle truck power devices for con
Figure 12 is a sectional elevation taken on the line
trolling the operation of the load grappling and
l2—|2 of Figure 11; and Figure 13 shows a sec
hoisting mechanism, which power devices are
tion taken on the line |3—l 3 of Figure 12.
actuated by an easily manipulated, manually con
Referring to Figure 2 of the drawings, there is
trolled lever arrangement requiring a minimum of 50 illustrated a straddle truck comprising a main
eifort and attention on the part of the operator.
frame l0 mounted upon wheels it carried in wheel
It is a further object of the invention to provide
forks I2. Each frame member is rectangular in
a new and novel arrangement of power devices for
cross section, having spaced vertical walls l3 and
controlling the operation of work performing
M. The stems l5 of the wheel forks extend ver
mechanisms, together with a simple arrangement 55 tically above the wheels and support the frame
of both manually and automatically controlled
ill at a height to permit the truck to overrun a
actuating means for energizing said power devices.
load to be carried thereby and pick it up and
It is a further object of the invention to provide
carry it in a straddled position.
an improved mechanism for moving the load en
Power to operate the straddle truck is provided
gaging shoes on a straddle truck relative to a load 60 by a motor 16 from which power is transmitted by
2,410,965
3
way of drive shaft l1 and differential gearing Is
to the drive axles l8. Sprockets 2| are mounted
on the outer ends of the drive axles l9, and trained
over the sprockets 2| and over wheel sprockets 22
are drive chains 23 by means of which power is
transmitted to drive the wheels ||. The steering
mechanism comprises the steering wheel 24, drag
links (not shown) and tie rods 25 interconnecting
steering arms 28. As is usual in trucks of‘ this
mounted on the shafts 31 whereby rotation of
shaft 44 imparts simultaneous rotary movement
to each shaft 31. Rotation of the shafts 31 in
one direction tends to straighten the joint be
tween'the crank arms 38 and the links 4| and
moves the slides 33 transversely of the frame l8
to their innermost positions. This movement of
the slides 33 swings the lower ‘ends of the swing
posts 28 inwardly of the straddle truck and moves
type, all of the operating mechanism, comprising 10 the load engaging shoes 21 into position to pick
up the load, as shown by broken lines in Figure
both driving and hoisting mechanisms, is mounted
above the frame ID to provide a load space he
neath the frame and between the wheels.
As best shown in Figures 2 and 3, the load
grappling equipment comprises load engaging
3., Rotation of the shaft 31 in the opposite di
rection causes the links 4| and crank arms 38
to move to collapsed position, whereupon slides
,83
are moved outwardly of the frame II to cause
15
.the swing posts 28 to swing outwardly to the
positions shown in full lines in Figure 3.
At their upper ends the swing posts 28 are
tween the front and rear wheels on each respec
interconnected
by a rod comprising at each end
tive side of the truck. Brace rods 28 extend‘be
tween the frame Ill and the lower ends of the 20 thereof a link 5| connected to the upper end of
the swing post by means of a pin 52. The links
swing posts 28 to add rigidity to the structure.
5| are of insufficient length to meet in end to
The brace rods 28 are fulcrumed at their con
lend abutting relation transversely of the truck.‘
nection to the frame III to permit them to swing
and to complete the connection between the up
with the swing posts 28.
As best seen in Figure 2, the shoes 21 extend 25 per ends of swing posts 23 a rod 53 is provided
having threaded ends 54 received within nuts 88
longitudinally of the truck and are supported at
carried on the free ends of the links 5|. Adjust
their ends by links 12 directly connected to the
ment of the nuts 55 relative to the rod 53 de
lift mechanism. Each shoe 21 is provided with
'termines the distance between the load engaging
parallel vertical ?anges 3 extending outwardly
from the vertical ?ange of the shoe, the two 30 shoes 21 prior to manipulation of the slides 33
{for moving the shoes into and out of load engag—
?anges 8, 9 de?ning a guideway for the swing
ing position.
post 28. Rollers 8 joumaled in the ?anges‘ 3, 8
For moving the load engaging shoes 21 verti
have rolling engagement with the swing posts 28
cally of the swing posts 28, as for clamping a
for guiding the shoe during movement of the
load between the shoes and the under side of the
hoist. Each shoe is provided at its ends with
frame l8, there is provided a hoisting mechanism
horizontal ?anges 1, each ?ange being perforated
comprising lift chains 58, the arrangement of
for receiving therethrough the shank of a bolt
which may better be understood by reference to
8 which supports the shoes on the lower ends of
Figures 11, 12 and 13. The lift chains shown are
the links 12. Each link 12 carries at its lower
end a nut 5 for receiving the threaded end of 40 of multiple width, each'chain being trained over
pairs of sprockets 51 mounted on drive shafts
the bolt 8. The shoes 21 are mounted loosely on
58 and over idler sprockets 53 mounted on stub
the bolt 8, the latter being of su?lcient length
shafts 8|. The stub shafts 8| for ‘the idler
to permit vertical movement of the shoe on the
sprockets 53 are carried by standards 82 mounted
shank of the bolt in the event the shoe should
strike an obstruction during lowering movement 45 adjacent the lower end of a frame 83 providing
therewithin a grooved track 84 for a cross head
of the hoist mechanism. The shoes are rotatable
85. The tracks 84 are arranged vertically of
, about the swing posts 28 in a horizontal plane,
the frame 83, and the cross heads are moved
the loose connection between the ends of the
vertically relative to the frame in response to
shoes and the links 12 permitting the shoes to
operation of the chains. Each cross head 88 is
align themselves with a load which may be angu
.provided adjacent its upper end with a socket
larly and laterally misplaced relative to the cen
88 for receiving the head of a pin 81 secured to
ter line of the straddle truck.
»
one end of each of the lift chains 58. The socket
Each swing post 28 is provided with trunnions
88 provides with the pin 81 a swivel coupling
3| journaled in bearings 32 mounted on a slide
shoes 21 adapted to be moved vertically on swing
posts 28 mounted in the frame l0 midway be
33 slidably mounted on a supporting structure
‘between the chain 58 and the cross head 88. The
socket 88 is ?ared upwardly to permit the pin 81
extending between and secured to the spaced wall
to align itself with the chain 58 to insure that
portions l3 and H of the frame l8. The struc
the pull will be distributed equally throughout
ture may comprise members 34 supported upon
the cross sectional. area of the, chain. From
angle members 35 fastened to facing surfaces of
the frame walls. Both the members 34 and slides 60 thence each lift chain 58 is trained over drive
sprocket 51 and idler sprocket 58 and is con
33 are provided with openings for receiving the
nected to the cross head 85 at a 'point adjacent
swing posts 28 therethrough. The slides 33 are
the connection for the pin 81. At its lower end
movable transversely of the frame l8 in grooved
the cross head 88 is provided with parallel
guides 38 bolted to the supporting structure. A
?anges 83 having aligned apertures 83 for re
shaft 31 having crank arms 38 is joumaled in
ceiving therethrough a pin 1|. The link 12 is
bearings 33 mounted on each of the supporting
joumaled on the pin 1| and extends between the
structures. Links 4| connect the crank arms 38
cross head 85 and the load engaging shoe 21,
with bosses 42 on the opposite edge of each slide
being secured to the latter by means of the bolt
33, to which the end of each link 4| is pivotally
attached as by pins 43. The slides 33 are con 70 8 and nut 5 hereinbefore described.
trolled by a mechanism comprising a shaft 44
Friction drive for hoisting mechanism
' extending transversely of the truck and joumaled
At the forward end of the motor l8 the drive
vin bearings 45 suitably mounted on the outer
shaft l1 is connected by means of a ?exible cou
walls l3 of the frame l8. Links 48 connect levers
41 mounted on the shaft 44 with levers 48 75 pling 14 to a shaft section 15 which in turn is
5
2,410,905
connected through a ?exible coupling 16 to a
shaft section TI journaled in bearings 18 carried
in a housing ‘I9. The forward end of the shaft
section 11 is provided with a friction cone 88
arranged between the inner sides of a friction
transmission wheel 8| formed of two frusto-cones
connected together at their smaller ends and
forming a V-shaped annular groove 82 therebe
tween. The friction wheel 8I is keyed to a shaft
83 journaled in bearing 84 and 85 and connected
I85 and the end wall II6 of the casing I84, tends
to hold the lever arm 98 in mid position.
For urging the lever arm 98 to neutral position
the frame member 94 is equipped with a pair of
standards I", one standard II'I being mounted
adjacent each of the ?anges I83 to which the vac
uum power devices\ IN and I82 are fastened.
v Each standard I" formsa fulcrum for a lever
16
at each end through ?exible couplings 86 with
shaft sections 81. The shaft sections 81 are in
turn connected through ?exible couplings 88 to
shaft sections 89 provided with worm gears (not
shown) which mesh with gears 9| keyed to the 15
ends of shafts 58. The shafts 58 extend longi
tudinally of the truck, being journaled in bear
H8, the opposite end II 9 of which bears against
a boss I28 on the housing 79. A resilient com
presslon element, such as a helical spring I2I, is
arranged between the frame member 94 and, the
lever II8 for urging the lever upwardly in oppo
sition to the turning moment of ‘the housing 19
as created either by the oppositely disposed lever
H8 or by operation of one or the other of the
vacuum power devices IM and I82. For limit
ings 92 mounted on frame members I8. Mounted
ing the upward movement of each lever I I8 there
on the shafts 58 are the pairs of sprockets 51
is provided a loose connection between each of
over which are trained the lift chains 56 herein 20 the levers H8 and the frame member 94 formed,
before described.
in this instance; by a rod I22 pivotally connected
The housing ‘I9 is of generally cylindrical shape
at its upper end to the lever II8 by means of
and is rotatably supported in a block 93 slidably
a pin I23 and bearing on its lower end a nut
mounted on a grooved ‘plate 95 fastened to the
I24. The rod I22 extends through an aperture
frame member 94. The position of the block 93 25 I25 in the frame member 94 and is freely slid
is adjustable in a direction longitudinally of the
able therein, the nut I24 engaging the under
shaft ‘I1 to provide for movement of the friction
surface of the frame member 94 for limiting
cone 88 toward or away from the friction wheel
upward movement of the lever.
8|, both for purposes of initial adjustment of
With the lever arm 98 in neutral position the
these parts and to compensate for wear. Slots 80 friction cone 88 is held out of engagement with
I 8I in the frame member 94 extend in a direc
either side of the friction wheel BI and the load
tion parallel to the shaft ‘IT for receiving there
raising and lowering means are held stationary.
through bolts I85 which engage in tapped recesses
When, however, the lever arm 98 is moved in one
in the block 93. The heads of the bolts I 85 en
direction or the other, the friction cone 88 en
gage under a strip Washer I82 against which look 35 gages one side or the other of the friction wheel
washers are seated.
An adjusting screw I83
8| and rotation of the drive shaft I1 is trans
equipped with a lock nut I84 forms with a boss
mitted therethrough to drive the shaft 58 and
I86 a stop against which the block 93 bears when
actuate the lift chains 56. The direction of oper
the friction done 88 is moved into engagement
ation of the lift chains 56 is determined by the
with the friction wheel 8I. The block 93 is pro 40 direction of rotation of the friction wheel 8|.
Assuming rotation of the drive shaft I‘! in the
direction indicated by the arrow I26 in Figure 6,
movement of the lever arm 98 to the right will
cause rotation of the friction wheel in the clock
with an upstanding lever arm 98. The lower sur
face of the housing 19 is provided with outwardly 45 wise direction, whereas movement of the lever
vided with spaced clamps 96 which engage around
opposite end portions 9'! of the housing 19. Be~
tween the clamps 98 the housing ‘I9 is provided
projecting cam surfaces 99 de?ning a recess I88
therebetween.
Bearings 78 carried within the housing ‘I9 for
supporting the shaft ‘I1 are mounted eccentrically
arm 98 to the left will cause rotation of the fric
tion wheel in the counterclockwise direction. In
one direction of rotation of the friction wheel
the lift chains 56 are actuated to raise the load
of the housing so that rotation of the housing 50 engaging shoes, while rotation of the friction
wheel in the opposite direction operates to lower
operates to move the shaft TI laterally of the
the load engaging shoes.
_
1 1-1,
housing 19 and the friction cone 88 into engage
A cam roller I21 mounted on the upper'end of
ment with one or the other of the frusto cones
an arm I28 engages in the recess I 88 between the
comprising the friction wheel 8| , according to in
cam surfaces 99 during the times that the lever
which direction the housing isrotated. For im
arm 98 and shaft 11 are in neutral position. The
parting rotary movement to the housing 19 there
arm I28 and cam roller I21 are part of a. brake
is provided a pair of oppositely disposed vacuum
mechanism comprising a lever I29 fulcrumed on
power devices I8I and I82 bolted to upstanding
?anges I83 on the frame member 94. Each of 60 the end of a bolt I3I and extending longitudi
nally beneath the friction wheel M. The bolt I3 I ‘
these devices comprises a casing I84 containing
depends somewhat below the frame member 94, a
a ?exible diaphragm I85 secured between the two
compression spring I32 being positioned between
halves of the_casing and dividing the casing on
the frame member 94 and the end of the lever
a medial line to form two chambers. One of
these chambers I 86 is open to atmosphere through 65 I 29 to give resiliency to the brake mechanism.
The lever I29 extends to a point beneath the
an ori?ce I 81, whereas the other chamber I88
housing ‘I9 where its free end is supported by a
is closed except for a pipe connection I89 and pipe
compression spring I33 mounted on a bolt I34.
line III which connects the chamber I 88 with a
The spring I33 bears at one end against a nut I35
control valve I I2, presently to be described. Con
threaded on the bolt and at the other end against
necting the diaphragm I85 of each power device 70 the under side of the lever I 29, and urges the
I is a rod II3, the two rods H3, H3 extending
lever I ‘29 upwardly in opposition to the downward
transversely of the housing ‘I9 and being each
thrust on the cam roller I21. A brake shoe I36,
connected to the lever arm 98 and to each other
V-shaped in cross section, is mounted on the lever
by a pin II4. A compression spring II5, dis
I29 in position to be held thereby against the
posed in the chamber I88‘ between the diaphragm 75 inner faces of the friction wheel 8| at such times
’ 9,410,905- \, I
-
8
-
,
~
swingposts 25'and load'cna?dnl shoei?into
astheshaft11isinneutralposition andthecam
or out of engagement with a load.
.roller I21 engages in‘ the recess I55. when, how
Amuming
ever, the lever arm 55 is moved either to the left _ - that movement of the operatingjever I52 to the
or right to cause the friction cone 55 to engage
rightoperates'romovetheloadmgl?nllhoel
into engagement with the load. then movemmt
of the operating lever I52 in the opposite direc-_
oneortheotherofthefrustoconescomprising
the friction wheel, the cam roller I21 rides upon
tion,ortotheleft.actuatesthevalve I44tocloee
one or the other of the cam surfaces 55 and
moves the lever I25 downwardly in opposition to
the action of the spring I52. Downward move
the aforementioned end of the cylinder I45 to
leases the wheel. The cam surfaces 50 are so
designed as to cause the brake shoe to be moved
away from the friction wheel simultaneously as
‘saidoppositeendtoatmosphere. Bythismeans
atmosphere and provide
betwem
ment of the lever I25 moves the brake shoe I55 10 said end and the vacuum reservoir I42. and to
close the conduit between the vacuum reservoir
away from the friction wheel II and thus re
the friction cone 55 engages the frusto cone.
Control mechanism
The control mechanism for operating the load
enlaging shoes 21 and the lift chains 55 may in
clude the engine manifold I 51, a vacuum pump
or any suitable means for producing vacuum. _A
conduit I55 connects the manifold I51 with a
check valve I55, and a conduit I4I_ ‘connects the
check valve with a vacuum ‘reservoir I42. A con
duit I45 provides communication between the
andtheoppositeendofthecylinderandopen
shafts44and51 arerotatedinthcowolitedi
15' rection from that hereinbefore described. and
swing posts a and load engaging shoes 2‘! are
moved out of engagement with the load.
The operating lever I52 is also adapted for
movement both in a forward direction and in a
20 rearward direction from the neutral position.
Movement of the lever in one of these directions.
for example. forwardly of the truck, actuates the '
valvelllsoastoplacethechamber lllofthe
- vacuum power device I52 in communication with
25 the vacuum reservoir I42, at the same time open
ing the chamber‘ I55 in vacuum power device "I
to atmosphere. ‘Operation of the valve in this
vacuum reservoir I42 and the control valve ‘I44.
Conduit I4I connects ahead of the check valve
I55 with conduit I45, providing communication
manner will cause the diaphragm I55 in vacuum
power device I52 to move toward the endwall II5
between the vacuum reservoir I42 and control
valve 1 l2.
-
30
.
It will be remembered that the swing posts 25
against the resistance offered by spring 3 I5. Thus
the housing 15 is rotated in the direction of the
are journaled in bearings 52 mounted on slides 55
vacuum power device I52 and moves the friction
way of the conduits I45 and I5 I , control valve I44.
and conduit I45. The valve I44 may be of any
suitable type well known in the art, and may be '
ets 51 are rotated in a predetermined direction
to cause the lift chains 55 to raise or lower the
cross head 55 to which shoes 21 are attached by
means of the link 12. Assuming that movement
cone 50 into engagement with the frusto cone on
adapted for limited movement transversely of the
the right hand side of the friction wheel 2I. At
frame I5 through operation of toggle links 55-4I'
whichin turn are controlled by rotation of the 35 the same time, the cam roller I21 engages the
cam surface 55 to depress the lever arm I25
shaft 44. Rotation of shaft 44 is controlled by a
against the‘ action of the spring I22 and move
servo-motor comprising a cylinder I45 within
the brake shoe I55 out of engagement with the
which is mounted a piston having a piston rod I41
friction wheel 5|. Rotation of the drive shaft I1
connected by suitable coupling means to a lever
I45 fastened to the shaft 44. The cylinder I45 40 being imparted to the shafts 51, and from thence
through gears 55-5I to the shafts 55, the sprock
is connected with the vacuum reservoir I42 by
connected through suitable linkage to an operat
ing lever I52 mounted in the operator's compart
ment. By control'of the valve I44 either of the
opposite ends of the cylinder I45 may be placed
in communicationwith the vacuum reservoir I42
while the other end of the cylinder is opened to
atmosphere. The valve I44 is connected to the
of the operating lever I52 forwardly of the truck
operates through the mechanism Just described to
raise the load engaging shoes 21, the movement
operating lever I52 by way of a link I55 con
of the operating lever I52 in the opposite direc
tion, or rearwardly of the truck, actuates the con
trol valve I I2 to open the chamber I55 in vacuum
power device I02 to atmosphere and to place
nected to the valve I44 and a link I54 connected
to the operating lever I52, the two links being
munication with vacuum reservoir‘ 142, where
interconnected by means of a cross lever I55.
'
It will be noted that the operating lever I52
is fulcrumed intermediate its ends on the up
standing arm I55 of the lever I51, having a tubu
lar portion I55 Journaled in bearings I55 secured
to a plate I5I comprising a part of the frame of 60
the vehicle. The lever I51 is connected through ‘
suitable linkage I52 to the control valve “2 which
controls the action of the vacuum power devices
IOI and I02.
The operating lever I52 may be moved to the
left and to the right, pivoting during such move
chamber I05 in vacuum power device III in com
upon the friction cone 55 is moved into engage
ment with the left hand side of the friction wheel
5| and the cross shaft 51 is rotated in the oppo
site direction to lower the shoes 21.
Means is provided to arrest movement of the
cross heads 55 whenever the cross heads approach
the limits of their movements in the grooved
tracks 54. It will be remembered that operation
of the lift chains 55 is controlled by a friction
drive which is actuated by vacuum power devices
IIII and I02, and that in turn the operation of
these vacuum power devices is controlled by a
valve
H2. The valve is actuated by a lever I51
ments on the pin I55 mounted in the arm I55 of
connected to the valve by means of linkage I52.
the lever I51. Movement of the operating lever
Fastened ‘on the link I52 in spaced apart rela
I52 In the right actuates the valve I44 to open
one end of the cylinder I45 to atmosphere and 70 tion; are collars I54 and I55. Extending between
the collars I54 and I55 is one arm I55 of a bell
place the opposite end of the cylinder I45 in
crank I51 iournaled on an upstanding pin I15
communication with the vacuum reservoir I42.
fastened’in the deck of the truck frame. The
Thus the piston and piston rod I41 are moved
other
arm I55 01' the bell crank I51 is connected
in a predetermined direction to rotate the shafts
44 and 51 to shift the slides 55 for moving the 75 by alink I55 tothearm I1I ofabeilcrank I12
2,410,965
journaled on the frame I0. A link I13 extends
through the deck of the truck and is positioned
adjacent the grooved track 64 in the frame 53.
Fastened to the link I13 a short distance beneath
the deck of the truck is a collar I14 having a
stop member I15 extending into the path of move
ment of the cross head 65. Fastened to the lower
end of the link I13 is a second collar I16 equipped
with a stop member I11 likewise extending into
'
'io
, 'ulation- of‘the operating leverif a gear trans
mission were used.
When the lift truck has transported the load
to-the place of unloading, the'operator stops the
carrier and moves the lever_|.51 in the required
direction to move the elements of the valve I I2
into position to actuate the‘ transmission to drive
the load carrying shoes downward. As the shoes
21 approach the-lowermost limit of their move
the path of movement of the cross head 15. A 10 ment, the pin I18; on the cross head 55 strikes
pin I18 projecting horizontally from the cross
the stop member I11 on the link I13 and actuates
head 65 is so arranged as to strikc the stop mem
the bell crank I61 and link I62 to move the valve
ber I15 'as the cross head approaches its upper
I I2 to neutral position and so stop the downward
limit of movement and to strike the stop member
movement of the load engaging shoes. There
I11 as the cross head approaches its lower limit 15 upon the operating lever I52 may be moved to
of movement. In either instance movement of
the left to actuate the valve I“ and so cause
the link I13 in the vertical direction is trans
the swing posts 28 to move to their outermost
mitted through hell crank I12 and link I69 to
position for releasing the load.
hell crank I61 which in .turn moves the link I62
Having now described my invention and in
in the direction necessary to restore the valve I I2 20 what manner the same may be. used, what I claim
to neutral position. In the neutral position of '
as new and desire to protect by Letters Patent is:
the valve II2 chambers I08 in vacuum power de
1. In a straddle truck, a frame, a pair of
vices IM and I02 are subjected to equal vacuum
grappling members mounted one on each side of
by way of the connection with the vacuum reser
said truck and movable inwardly into position to
voir through the valve I I2, and the lever 98 re- ~ engage a load, toggle levers reacting between said
turned to neutral position. At ‘the same time
frame and said grappling members in a manner
the brake shoe I36 is moved into engagement
to vary the lateral spacing of said grappling mem
with the friction wheel 8| to stop movement of
the load raising and lowering means as herein
before described.
Operation
In operation of a straddle truck embodying the
construction hereinabove described, as the truck
is driven over .a load to be carried theoperator
manipulates the operating lever I52 to lower the
load engaging shoes 21 as the truck approaches
the load. Thereupon, the lever I52 is moved to
bers, means for controlling the action of said’
toggle levers; a transmission mechanism for
transmitting power for raising and lowering a
load carried by said grappling members compris
ing a friction cone, a friction wheel engageable
by said friction cone for being driven in either of
opposite directions of rotation, means for moving
said friction cone into engagement with said
friction wheel, means for controlling the direc
tion of movement of said last named means for
determining the direction of rotation of said
the right to cause the load engaging shoes to
move into engagement with the load, whereupon
wheel; a lever mounted on said straddle truck,
the lever I51 is rotated in the forward direction 40 means interconnecting said lever and the means
to cause the valve I I2 to maintain the chamber
controlling said grappling members, and means
I08 in vacuum power device I02 in communica
for interconnecting said lever and the means for
tion with vacuum reservoir I42, at the same time
controlling movement of said friction cone. said
opening the chamber I08 in vacuum power device A‘ lever being movable in one direction to actuate
IN .to atmosphere. Thus the friction cone 80
said grappling means and being movable in an
is moved into contact with the side of the friction
other direction to actuate said friction cone mov
wheel 8| which transmits the driving motion of - ing means.
the shaft I1 to the transverse shaft 81 to raise
2. In a straddle truck, a‘ plurality of control
the load carrying shoes 21 and lift the load.
mechanisms for controlling operation of the load
Upward movement of the load carrying shoes 50 carrying apparatus, a lever mounted on said truck
may continue until the load of lumber is clamped
comprising a member journaled for rotation in
between the shoes and the under side of the
a direction longitudinally of said truck, an up
frame I0, or movement of the load may be ar
standing arm on said member, an arm pivoted in
rested at any desired position. When the load
termediate its end on said ?rst named arm for
has been raised the operator moves the lever I51 ‘ rotation about said pivot in a direction trans
to neutral position, thus actuating the valve II2
versely of said truck, means connecting one end of
to cause chambers I08 in vacuum power devices
said pivoted arm with one of said control mech
HM and I02 to be subjected to equal vacuum and
anisms, and means connecting said member with
another of said control mechanisms whereby
so restore the lever 98 to neutral position. At
the same time the brake shoe I36 is moved up
wardly by force of the spring I33 into engage
ment with the friction wheel 8| and holds the
load in the raised position. An advantage of the
construction resides in the fact that the friction
transmission for the hoisting mechanism permits
a certain amount of slippage of the transmission
movement of said arm in one direction rotates
said member and actuates one control mechanism
and movement of said arm in a direction at right
angles to said ?rst movement actuates the other
of said control mechanisms.
3. In a straddle truck, a pair of grappling mem
bers mounted one on each side of said truck and
elements, so that the load carried by the shoes 21
may be clamped tightly against the under side
of the frame I0 without the necessity of exactly
timing movement of the lever I51 by the opera
power means comprising a prime mover for oper
tor. In other words, the friction drive acts as
a slip clutch between the drive shaft I1 and
the cross shafts 81, and eliminates distortion
or breakage of the lifting mechanism which
power means comprising a prime mover for op
might otherwise result from badly timed manip
movable inwardly into position to engage a load,
ating said ‘grappling members, a load hoisting
mechanism connected to said grappling members
for raising and lowering a load carried thereby,
erating said hoisting mechanism, and a single
control lever means connected with each said
power means, and operable to actuate either one
. 2,410,965
. or both of said power means according to the
' direction of movement of said lever.
'
' .7.’Inastraddietruck.apairof grapplingmem
bersmountedoneoneach side ofsaidtruck and
movable inwardly into position to engage-a load, "
4. In a straddle truck, a pair of grappling mem
means for operating said grappling'members, a
bers mounted one oneach side of said truck and
hoisting mechanism connected to said grap
movable inwardly into position to engage a load,'. load
pling members for raising and lowering a load
means for operating said grappling mem
load hoisting mechanism connected to said. ' carried thereby, power means for operating said
hoisting mechanism comprising a frame, an ce
.members for raising and lowering a
centric journaled in said frame, a drive shaft
load carriedthereby. power means for operating
said hoisting mechanism, said power means com- 1
prising a frame, an eccentric iournaled in said I
. frame. ashaft iournaled‘in said eccentric, means
a pair of
for rotating said eccentric comprising
I
vacuum power devi . means connecting each of
journaled in said eccentric, driving means mount
ed onsaid shaft, a driven 'shaft- having driving
connection‘ with said load hoisting mechanism,
means mounted on said driven shaft and engage
able by said driving means for-‘driving said driven
‘shaft in either of opposite directions, means for
rotating said eccentric comprising a pair of vac
means‘ for actuating a selected one of said vacuum
power devices for rotating said eccentric in a ' uum power devices, means connecting each of
said vacuum 'power devices with said eccentric,
predetermined direction, a lever mounted on .said
and means for actuating a selected one of said
interconnecting
said
lever
straddle truck, means
and the means for operating s'aid grappling mem :20 vacuum po'werdevices for rotating said eccentric
'in a predetermined direction, a control lever
ber, and means interconnecting said lever and
mounted on said truck, means interconnecting
the means for actuating a selected one of said
said lever and the means for operating said grap
vacuum power devices, said lever being movable in
one direction to actuate said grappling, means ' pling members, and means interconnecting said
control lever and the means for actuating a se
and being movable in another direction to actue
lected one of said vacuum power devices.
ate a selected one of said vacuum power devices.
8. In a straddle truck, a pair of grappling mem
5. In a straddle truck, a pair of grappling mem
bers moimted one on each side of said truck and
bers ‘mounted one on each side of said truck
movable inwardly into position to engage a load,
and movable inwardly into position to engage a
means for operating said grappling members, a
load, power means for operating said grappling
load hoisting mechanism connected tosaid grap
members, a load hoisting‘ mechanism connected
pling members for raising and lowering a load
to said grappling members for raising or lower
carried thereby, power means for operating said
ing a load carried thereby, power means for op
hoisting mechanism comprising‘a frame, an ec
erating said hoisting mechanism comprising a
centric journaled in said frame, a drive shaft
friction cone, a friction wheel engageable by said
joumaled in said eccentric, driving means mount
- friction cone adapted tobe driven in either of op
ed on said shaft, a driven shaft having driving
poslte directions of rotation, means connecting
connection with said load hoisting mechanism,
said friction wheel and said load hoisting mech
means mounted on said driven shaft and en
anism, means for moving said friction cone into
gageable by said driving means for driving said
engagement with said friction wheel, and means
driven shaft in either of opposite directions,
for controlling the direction of movement of said
means for rotating said eccentric to cause said
'last named means for determining the direction
driving means to engage the means on the driven
of rotation of said wheel, a control lever mounted
shaft ‘for rotating said shaft in a predetermined
‘ on said straddle truck, means interconnecting
said lever and the means for operating said grap 45 direction, a manually operable control member
on said truck, means interconnecting said control
pling members, and means interconnecting said
member and the means for operating said grap
lever and the means for controlling the direction
said vacuum power devices with said eccentric,‘
of rotation of said friction wheel.
I
pling members, and means interconnecting said
control member and the means for rotating said
hers mounted one on each side of said truck and 50 eccentric,- a brake normally engaging said driven
‘means, and means for moving said brake out of
movable inwardly into position to engage a load,
engagement with said driven means upon rotation
means for operating said grappling members,‘
of said eccentric.
a load hoisting mechanism connected to said
9. In a straddle truck. a plurality of control
grappling ‘members for raising and lowering
mechanisms for controlling operation of the load
a load carried thereby, power means for operat
carrying apparatus, a lever mounted on said
ing said hoisting mechanism comprising a frame,
truck comprising a member :lournaled for rota
.an eccentric journaled in said frame, a drive
6. In a straddle truck, a pair of grappling mem-v
shaft Journaled in said eccentric, driving means
moimted on said shaft, a driven shaft having
driving connection with said load hoisting mech
anism, means mounted on said driven shaft and
engageable by said driving means‘for driving said
driven shaft in either of opposite directions, and
means for rotating said eccentricto cause said
driving means to engage the means on the driven
shaft for rotating said shaft in a predetermined
direction, manually operable control means on
said truck, means interconnecting said control
means and the means for operating said grap
pling members, and means interconnecting said
control means and the means for rotating said
eccentric.
tion in one direction, an upstanding arm on said
member, an arm pivoted intermediate its ends
on said ?rst named arm for rotation about said
pivot in another direction, means conecting one
end of said pivoted arm with one of said control
mechanisms, and means connecting said member
with another of said control mechanisms whereby
movement of said arm in one direction rotates said
member and actuates one control mechanism and
movement of said arm in another direction actu
ates the other of said control mechanisms.
HENRY N. DIMICK.
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