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Патент USA US2131479

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Sept. 27, 1938.
J. R.- MCGIFFERTHET Al.
" _
2,131,479‘
LOADING yn'ors'r ' >
Filed July 11, 1936
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3&3 W
~ 3 Sheets-Sheet 1
Sept. 27, "1938! '
J. R. MCGIFFERT ET AL
‘LOADING HOIST
.Filecl July '11, 1936 ‘
.
2,131,479 .
‘
3 Sheets-Sheet .3
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611M441
'
Sept. 27, 1938;
J. RIMCGIFFERT ET AL
4 2,131,479
LOADING HOIST
Filed July 11, 1936
3 Sheets-Sheet
m$5,s0“?8“
'
2,131,479,
Patented Sept. 27, 1938
UNITED STATES ‘PATENT. ‘OFFICE
LOADING nors'r
_ John a. McGifiert and on L. Bel-by- Duluth,'_
Minn, assignorsvto Clyde Iron- Works, Duluth,
' Minn” a corporation of Minnesota
‘Application- .my 11-, 19:0. Serial No. time
(01.212-145)
lzclalms.
the hoisting equipment a heavy load may be lifted
at the end of the boom and which is counter
balanced by the weight of the hoist and tractor
Our. invention relates to an improvement in
loading hoists of a type designed to be readily
movable from one position to another and which
is particularly designed for use in loading logs as well as by the counter-weight.
These and other novel features and objects 5
5 on trucks, sleighs, or other vehicles, and is adapt
able for general hoisting and material handling. of our invention will be clearly andfully set .
steel erection, pile driving. and clam shell. and . forth in the following specification and claims.
In the drawings forming a part of thisspeci
bucket. work.
‘
Loading devices due to their size‘
weight"
flcation:
10 are naturally‘ difficult to move from one position
to another. We, have found that where loading -'
devices have been mounted upon crawler units
or the like, they are often top heavy and unstable
and are unable to lift heavy loads at any great
ll distance from the hoist.
'
It is a ‘feature of our invention to provide a‘
~
‘
Figure 1 is a side elevation view of our loader 10 \
in loading position.
-
Figure 2 is a front elevation view of the same
loader whichis readily portable and yet which
with the boom cut oil and the hoisting machinery
omitted to show the detail of the construction of
the front.
16
Figure 3 is an enlarged view of the front end
of the hoist frame, disclosing the leg of the frame
is ?rmly supported during loading operation.
in lowered position.
'
Figure 4 isaview similartol'igure 3,showing
the pivoted legs in raised position.
This feature is accomplished by providing rigid
20 legs pivoted to the frame of the loader in such a
manner that they may be raised out of operative -
‘Figure 5 is a perspective view of one of the piv-'
ground engaging position during the movement _oted legs, disclosing the construction thereof‘.
Figure 6v is a top plan view of our loader.
of the loader from one position to another, and
Figure 7~is an enlarged detail of the hoisting
yet which‘ may ?rmly support the loader during
_ as loading operation.
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equipment.
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It is a feature of our invention to provide a
Figure 8 is a diagrammatic side elevation view,
loader mounted upon a tractor preferably of the
disclosing the legs in partially uprighted‘positon.
crawler type provided with- supporting legs for
one end of the frame which may be .operated in
‘80 unison into contact with the ground. ‘The move
ment of the tractor toward the legs may act to
pivot the same into upright position to rigidly
support one end of the loader frame. The legs
. 26
Figure 9 is-a sectional view through a detail
portion of our device.
‘
v
Figure 10 is a diagrammatic plan view illus- so
trating the manner in which the live boomv may- I
be supported to the loader frame. [A
Our loader A is provided with arframe vhaving
are of suillcient length to relieve the weight on _ a pair of spaced channels ll ‘which are secured
36 one end of the tractor. so that the loader is en intermediate their ends to a tractor B. The at--35
tirely supported by the rigid legs and the spring ‘tachment of the channels II to the tractor B
supported end of the tractor.
.
.
‘ - _
c‘
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. may vary with the type of tractor used and in
Our invention resides in providing a loader the type, disclosed, bolts directly at I. to the
which is mounted upon a standard ‘tractor and "frame at one end of the tractor and is secured Q
‘40 which is balanced in such a manner‘ that the adjacent the other end by means of brackets I4. '40
center of gra'vityfof the device coincides with The channels I. are connected by‘ suitable cros
the center of gravity of the tractor itself. In members,_suoh as It, and areprovided at one
this manner,' the pitching of the,loader during, end with a counter-balance box it within which
movement‘ thereof is to a large degree eliminated. may be placed sumcient ballast of any desirable
t5 Itis a feature of our, invention to provide a typelto cause the center of gravity of the assem- 45
bled loader to coincide with that of the tractor
loader comprising a frame mounted upon a trac
tor and extending beyond the ends'thereof and B alone. The ballast‘ box I! is placed at the end.
having at one end of the frame a live boom and ' of the frame projecting-forwardly from the front.
a double drum hoist operated by power‘ supplied ll of the tractor. A hoist _C is mounted OllgthE g 50' by the tractor engine. The other. end oftheu frame to the rear of the tractor-B, as will be more 50
clearly described in detail. Power ofoperation _
frame is provided with a counter-weight to‘coun
tor-balance the weight of the hoisting equipment.
The load is in this way counter-balanced during
movement of the hoist. By providing the rigid
5s legs at the extreme end of the frame supporting‘
of the hoist is provided by means of the power
take-oi! shaft sprocket i1.
' .
.Attherearendsofthechannels llwepro-.
vide a vertical A-frame ll comprising a pair of la"
"
2
2;1s1,479
-channels secured at their lower extremities toa
cross member l9 extending transversely across
the channels l8 and projecting somewhat beyond
the channels Ill. The channels forming the A
frame l8 are preferably secured to plates 28
1
which in turn are secured to the cross chan
nel
9.
.
'
-
Centrally between the channels 18 and mount
ed upon the cross member 19, we provide a bevel
10 connection 22'which is hingedly secured at‘ 23
to a live boom 24. The boom 24 is constructed
' of special alloy steel of moderate weight and am
ple strength. The boom comprises a pair of 0p
positely disposed channels 25' connected by cross
15. members 28 at spaced points.
Spaced plates 21 depend downwardly from
each end‘of the cross channel 19 to accommodate
legs 28 which are hingedly supported therebe
tween by means of a pivot pin 29. In the form
20 illustrated, the legs 28 comprise a pair of chan
nels 38 which are oppositely disposed and con
nected along one side of they covering plates 32.
The inner plates 21Tadjacent each leg are pro
vided with a ?ange 33 which projects into the
25 body of the leg adjacent the inner channel 38
when the leg is‘in upright position as may be
seen in Figure 5 of the drawings.‘
,
' "
spring suspended, while the rear end is the rig
idly supported end of the tractor,‘ and according
ly the loader A is supported entirely by the‘ legs
28 and by the spring suspended end of the trac
tor B. This fact enables the loader to beerected
upon somewhat uneven ground without straining
the frame work and provides the equivalent of a
three-point mounting rather than a four-point
support as would be found if the rigidly support
ed end of the tractor remained incontact with 10
the surface of the ground.
‘ The hoist C disclosed, is provided with two ca
ble drums 48, each or either of which may be
used separately or simultaneously. ' In normal
operation, the boom 24 is connected to the top
of the A-frame by a tie cable 49 so that the reach
of the boom remains constant during the loading
operation. The boom 24, however, may be raised
above this position upon occasion by- a cable op
erable upon one of the cable drums 48 and ex 20
tending through a sheave 58 at the top of the A
frame and connected ‘to the outer extremity of
the boom 24.
.
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_
The manner in which the various cables are
driven is best illustrated in Figure 3 of the draw 25'
ings. From the power take-off I1 of the trac
tor B, a chain 52 operates a sprocket ‘53 one
shaft 54 upon which is mounted a pinion 55. The
This flange 33 acts to hold the leg with which
it engages from side movement when the leg is pinion 55' meshes with .a gear 58 on a shaft 51.
30 in this upright position. A ?ange 34 on the in-‘ The gear 58 engages the gear 58 on a shaft 59. 39
ner plates 21 limits the upward movement of the A gear 80 on the shaft 51 engages a gear 82 on a
legs 28 when the legs are drawn into inoperative shaft 83. One of ‘the cable drums 48 is mounted
position, as illustrated in Figure 4 of the draw ' upon the shaft 51, while the other is mounted
ings. The channels 38 are adjustabiy connected upon the shaft 59. Suitable clutches are providé
by bolts 35 or other suitable means to a pivot end ed between the gears 58 and 58 controlled by a 35
38 which is pivotally connected to the shoe 31. control mechanism 84 diagrammatically shown
Each shoe 31 is provided with a bearing plate in Figures 6 and‘ 7, but which is not disclosed in
38 having upturned ends 39. to which is secured detail as this mechanism is well known in the
a pair of upright channels 48. ‘The pivot end art. Suitable brake‘ bands are also provided
40 38 of each leg 28 is provided with a transversely which are not shown in the drawings to prevent 40
extending pin 42 extending through 'slots 43 in
the channels 40. Accordingly, the legs 28 are piv
confusion.
_
Upon the shaft 83 is mounted a pair of friction
‘ otally connected ‘to the shoes 31 so that'the shoes drums '85 as may be seen in Figure '1, which are
may maintain a substantially horizontal position ' valso controlled bysuitable controls 84. A cable
45 by their own weight even when in inoperative po-‘ 88 is wound upon one friction drum 85, passes
through a sheave 81 to a sheave 88 on the boom
Each leg 28 is provided with ‘a gear segment 44 - 24. The cable 88 passes over the sheave 88 through
a pulley 89 mounted on the adjacent end of the
attached along one side thereof which isengage
cross channel l8 and is secured to the sheave
able with a pinion 45 on a transversely extend
ing shaft 46. As the pinions 48 are both secured bracket 18 of the sheave 88 on the boom 24. 50
sition.
'
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.
for rotation with the shaft 48, it may be seen The other friction drum 85 is likewise provided
that the legs '28 pivot in unison to prevent one' ' with a cable 12 passing through a sheave 13 on
leg from assuming a vertical position before‘ th ' the frame, through a sheave 14 on the boom, back
through a pulley 15 on the adjacent end of .the
other due to uneven ground surface. >
- 55
The legs 28 with the'shoes‘ 31 are somewhat" cross member l8, and is ended at the sheave 55
longer than the normal distance between the bracket 18 on the boom 24. Movement of one of
frame and the surface of the ground.
Accord- - the drums 85 will act to pivot the boom toward
the engaged friction drum 85’while the cable will
pay out from the opposite friction drum 85. In
60 ‘contact with the ground as shown in Figure 8v order to. prevent slack in the cables 88 and 12. 60
of the drawings. The tractor B is then driven 'we provide a cable‘ 11 terminating on one drum
rearwardly for a short distance, the shoes 31 en- ’ 85 and passing through sheaves 18 and 19 with
gaging the ground and pivoting into the vertical ‘ its other end secured to the opposite friction
position illustrated in Figures 1 and 3. A means‘ drum 85. This ‘cable 11 causes the drums to move
65 '-is provided which will be later described to- assist 1 uniformly and to pay out an amount of cable 65
in drawing the legs 28 into vertical position in] from one drum 85‘which is wound upon the other .
ingly, when the legs are being pivoted into 'verti-‘
cal position they \are allowed to pivot down‘in'to
case the surface of the ground isetoo smooth to
be engaged by the shoes 31 as the tractor B is
drum. Spring bumpers 80 are mounted on the
cables 88 and 12 to limit the swinging of the boom
moved rearwardly. Due to the fact that the legs
within the desired arc.
70 28 are somewhat longer than the‘ normal dis
tance between the pivot point and the surface
of the ground when the legs are drawn into ver-'
_
The hoist C is- somewhat wider than the
distance between the channels l8, and is addi
70
tionally supported by angles 82 parallel to the
tical position, the rear end 41 will be raised ' channels In and supported by transverse chan
slightly from the' surface of the ground. In the n nels 83 and 19. The cross channel I9 is rein
75 tractor B disclosed, the front end 18 thereof is" forced by'a girder-arrangement between the in 75
3
2,191,479 -
ner plates 27. This construction comprises a
and through a sheave I08 at the free end of the
cross channel 8| below and parallel to the channel ' boom. The other load line I04 may pass through
I9. From the outer ends of the channel 88. chan
the others of the pairs of sheaves 50, I05, I08, if
nels 85 are secured slanting inwardly and up- '
desired. This line I04 may also be used as a
drag line, or as a guy line by extending it through
wardly to another shorter cross channel 88 se
cured beneath ,the ends of the channels I0. A
one of the‘pulleys 50 in the opposite direction
from that usuallyv used, and by anchoring the line
- plate 81 is welded or otherwise attached be
tween the cross channels to form a truss or
to a fixed anchor I01 at a point in front of the I '
girder reinforcement for the center of the cross tractor B.
7
10 channel I9 upon which the boom 28 is pivotally ._ When it is desired to change the position of 10
attached. The A-frame I8 is also reinforced by the loader, the setting up'procedure is reversed.
angles 88 extending from the top of the A-frame The pins 98 are ?rst removed, and the tractor B
I8 to a point on the channels I8 forwardly of is then driven forwardly until the legs 28 assume
the A-frame.
.
u
the position illustrated in Figure 8 of the draw
Depending from the cross channel 88 at one ings. The load line 98 is then attached to the 15
15
end of the‘ channels I0, and from a cross member loops'88 of the legs, and the legs drawn upwardly
It near the other end thereof, we provide bumper into the position illustrated in Figure 4 of the
drawings.
means to dampen any tendency of the as
When the legs 28 are in supporting position,
sembled loader to pitch during movement over
20 rough» ground surface. These bumpers 88 are the loader rests entirely upon the legs 28 and
merely linked in position, to swing ‘freely over upon the spring supported end of the tractor B. .20
. obstacles. Each bumper 89 comprises a cylinder
In tractors of the crawler type, one end of each
90 having a loop 92 thereon for connection with tread is spring supported; and it is desired to
the loader frame, and a bearing end 98 slidably. have this ‘end contact the ground so as to .com
connected to the lower end thereof. A spring 88 pensate for uneven ground, and to prevent 2.5
is interposed between the cylinder 00 and the strain on the frame of the loader.
bearing end 93 thereon within the‘ cylinder, and
In accordance with the patent statutes, we
acts to cushion any longitudinal rocking of the have-described the principles of operation of 'our
loader frame.
‘
'
loading hoist; and while we have endeavored to
30
From the foregoing description, the operation set forth the best embodiment thereof, we de 30
of our loader is believed readily understood. In sire to have it understood that this is only il~
moving from one position to another, the legs 28 lustrativelof a means of carrying out our in
vention, and that obvious changes may be made
are in raised position, and are held in this posi
tion by means of the load cable 85 on one of the within the scope of the following claims without
cable drums 48, which is engaged In a loop 86 departing from the spirit of our invention.
85
on each leg 28. Where the loader A is being used '
narily used having two hooks connected to a
connecting ring'on the cable 85. One of these
hooks may be inserted through the loop 88v on
each leg in drawing the legs 28 into inoperative
position, shown in Figure 4.
-
We
claim:
'
_
1
‘
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1. A tractor supported hoist in combination
with a tractor comprising a frame secured to said
tractor, a pair of supporting legs securedto one
for loading logs or the like, a sling 81 is ordi
end of said frame, aligned pivots connecting said
legs to said frame and means connecting said
'
legs to pivot in unison.
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.
.
tractor is moved to the desired point, and the load
2. A tractor supported hoist in combination
with a tractor comprising a frame longitudinally
cable 55 is'lowered, the shoes 81 contacting the
secured to said tractor, a~ hoisting unit on said
surface of the ground. The cable 85 is removed
'from the loops 86, and the tractor 3 moved rear
wardly until the legs are pivoted intov upright
frame, legs on said'frame longitudinally spaced
from said tractor, aligned pivots connecting said
frame and legs, and means connecting said legs
to operate said legs in unison.
When it is desired to operate the loader, the
position. ‘Pins 88 may then be inserted through
the legs and into the inner plate 21 as shown in '
Figure 5, to hold the legs in upright position.
'3. A tractor supported hoist in combination‘
with a tractor comprising a frame longitudinally
In some cases the surface of the ground upon - secured to said tractor, legs pivotally secured on
which the loader is to be operated is smooth or transversely aligned pivots to said frame, bearing
slippery, and rearward movement of the tractor shoes pivotally mounted on said legs, and means
B when the shoes 81 are in partially erected 'posi
connecting said legs‘topivot the same in unison.
tion illustrated in Figure 8 merely slides these
4. Ahoisting device in combination with a'trac
shoes over the surface of the ground. To avoid" tor including a frame secured to the tractor and
trouble in such cases in properly erecting the legs, , extending beyond one end thereof, supporting
we provide a sheave I80 on the shaft 48 having a ‘ means for said extended end of said framepiv
short length of cable III. secured thereto with a otally secured to said extended end and movable 60
ring I02 on its free end. The load cable 85 is‘ into vertical position, and means engageable with
carried over the sheave III on the cross channel
said supporting means to lock the same‘ in verti
84 and attached to the ring I02. By exerting a
cal position, said locking means including a lock
ing'pin, said supporting means being of suf
ficient length to take the weight off oneend of 65
pull on the load cable 85 as the tractor 13 moves
65 rearwardly, the sheave I03 is rotated, turning the
shaft 48 and the pinion l5, forcibly erecting the
legs as the tractor moves.
'
'
The cables 85 and I04 from the two drums 88
may be used simultaneously or separately and
70 individually as desired. As has been stated, one
cable‘ may be used for raising the boom 20 if de
sired. When used for raising a load, the cable‘
95 passes over one of a pair of sheaves 50 at the
top of the A-frame, over one of a pair of sheaves
75 I05 at the base or pivoted end of the boom 28,
said tractor.
'
.I
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5.'A hoisting device in combination with a
supporting vehicle having longitudinally spaced
weight supporting points, including a frame ex
tending beyond said weight supporting points,
w
supporting means pivotally connected to said
frame beyond said weight supporting points and
movable into vertical position, means locking
said supporting means in vertical position, said
locking means including a locking pin said sup- 75
> 4
2,131,479
porting means being of sufficient length to raise
said end of said frame to take the weight off
one of said weight supporting points.
relation with the ground adapted to dampen any '
pitching of said vehicle by engagement with the
ground, and to pass freely over obstructions.
10. In a loadinghoist, a tractor, a frame on
6. A hoisting device in combination with a sup
porting vehicle including a frame secured on
‘said tractor extending substantially beyond the
said vehicle, a supporting means on said frame
ends of said tractor, and a bumper means swing
longitudinally pivotal into and out of engagement -ably depending from said frame adjacent each
with the surface of the ground, and shoulder end thereof, said bumper means normally depend
ing to a point spaced slightly from the surface
means on said frame engageable with said sup
10
'10 porting means at a point spaced from the pivot of'the ground, said bumper means resiliently com
pressible when forced downwardly upon the
thereof when said supporting means is in en
.
gagemeiit with the ground-to limit transverse ground.
11. In a loading hoist, a supporting tractor,
movement in either direction of said supporting
a frame extending beyond said tractor, a bumper
means.
7. A hoisting device in combination with a depending from said depending end to a point 15
15
normally spaced from the ground, said bumper
supporting vehicle'including a frame on said ve
hicle, a pair of supporting means on one end comprising a pair of telescopically arranged mem
of said frame pivotally engageable with the bers, and a spring normally holding said mem
bers extended, said spring permitting said mem-'
ground, a pivotally supported shaft, means con
20 necting said shaft and supporting means to ro
tate said shaft when said supporting means is
pivoted, and means on‘said shaft for pivoting
said supporting means in either direction.
8. _A hoisting device in combination with a sup
bers to compress when said bumper strikes the 20
ground.
'
12. In a loading hoist, a tractor, a frame there
upon, a pair of pivotally mounted legs on one end
of said frame pivotally movable into engagement‘
26 porting vehicle including a frame extending sub- _ with'the ground, shoulder means on said frame
stantially beyond the vehicle, and resilient bump
limiting the pivotal movement of each of said legs,
er means depending from said frame engageable
and ?ange means on said frame engageable with
with the ground and normally spaced from the
ground to, mollify any pitching thereof.
each said leg when said leg is in contact with said
shoulder to prevent axial side movement of said
9. A hoisting device in combination with a sup
porting vehicle including a frame extending be
yond said vehicle, .' and bumper means swingably
depending from said frame into normal spaced
legs with respect to said frame. .
JOHN R.’ MCGIFFERT.
OLA ‘L. BERBY.
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