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Патент USA US2130939

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Sept. 20, 1938.
2,130,93§
A. E. WILLIAMS
LIFT TRUCK
Filed March 21, 1956
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Sept: 20, 1938.
2,130,939
A. E. WILLIAMS
LiFT TRUCK
Filed March 21, 1936
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A. E, WILLIAMS
2,130,939
LIFT TRUCK
Filed March 21, 1936
4 Sheets-Sheet 4
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Patented Sept. 20, 1938
2,130,939
UNITED STATES PATENT OFFICE
2,130,939
LIFT TRUCK
Arthur E. Williams, Jersey City, N. J., assignor
to Henry S. Germond, Bayonne, N. J.
Application March 21, 1936, Serial No. 70,024
4 Claims.
This invention relates to that class of trucks
commonly called “lift-trucks” or elevating trucks
which are used in lifting and transporting loads
(01. 254—10) -
embodying my invention, portions being broken
away and the elevating platform being shown in
its lower or normal position.
Figure 2 is a top plan view of the truck.
that are usually mounted on platforms or skids,
5 the truck being capable of being pushed under a
skid and then raising the same on the elevating
platform of the truck for transportation.
Such trucks usually include a wheeled main
frame, an elevating platform mounted thereon
Figure 4 is an enlarged longitudinal vertical
sectional view on the line 4—4 of Figure 2.
Figure 5 is a similar view showing the elevating
10 to move vertically upon being pulled horizon
tally, a handle for pulling the truck, an operative
connection between the handle and the elevating
throwing the locking dog out of locking relation
to the latch.
platform for raising the latter and a latch for
holding the elevating platform in elevated posi
15 tion.
One object of my invention is to provide a truck
of this general character embodying novel and
improved features of construction whereby the
handle shall be permanently operatively con
20 nected to the elevating platform so that it shall
be unnecessary to manually connect and discon
nect the handle from the platform, as is now
common in known trucks.‘
Another object is to provide in such a truck
25 a novel and improved combination of a latch
for holding the elevating platform in its elevated
position and a locking dog for holding the latch
in locking position with respect to the elevating
platform, said locking dog to be automatically
30 thrown out of locking relation to the latch by. and
upon swinging of the handle into» a position for
starting elevation of the elevating platform,
whereby the possibility of the platform acciden
tally descending in such a manner as to sudden
35 ly throw the handle upwardly is prevented, and
the locking dog may be easily and quickly thrown
out of locking relation to the latch at the proper
moment and with a minimum of attention by the
operator.
40
A further object is to provide a lift truck of the
general character described embodying a novel
and improved construction for varying the height
of the elevating platform to accommodate load
carrying skids or platforms which are disposed at
45 different distances from the floor.
Other objects are to provide in such a lift truck
a novel and improved hydraulic check for retard
ing descent of the elevating platform and to ob
tain other advantages and results as will be
50 brought out by the following description.
Referring to the drawings in which corre
sponding and like parts are designated through
out the several views by the same reference char
acters—
55
Figure 1 is a side elevation of a lift truck
Figure 3 is a front end elevational view thereof. 5
platform in its uppermost position.
Figure 6 is a like view showing the manner of 10
Figure '7 is a transverse vertical sectional view
on ‘the line 'l—'! of Figure 1.
Figure 8 is a fragmentary side elevation of the 15
rear end of the truck showing the adjustment of
the elevating platform, and
Figure 9 is an enlarged fragmentary sectional
elevational view of the hydraulic check.
Speci?cally describing the illustrated embodi- 2O
merit of the invention, the reference character A
designates the main frame of the truck which is
mounted at its rear end on wheels I journaled on
an axle 2 extending transversely in the main
frame. The front end of the frame includes a 25
bolster 3 on which is journaled on the longitudinal
median line of the frame, a caster 4 whereby the
truck may be guided upon lateral pulls on the
forward end of the frame.
An elevating platform B is mounted on the 30
main frame A by a pair of parallel links 6 at the
forward end of the frame and a similar pair of
links 1 at the rear end of the frame. The for
ward links are pivotally connected to the main
frame and platform on the respective pivot pins 35
8 and 9, while the rear links ‘I have their ends
pivotally mounted respectively on the rear axle
2 and a cross rod Ill the ends of which are jour
naled in adjustable brackets I l which are secured
to the sides of the elevating platform by bolts 40
I2 as will hereinafter more fully be described.
With this construction, a forward pull on the
elevating platform will result in it being raised
from the main frame.
For raising the elevating platform, I have 45
shown a transverse rod i3 at the forward vend
of the platform to which is pivotally connected
a pair of lifting links M, one at each side of the
platform.
The links have longitudinal slots l5
in which is slidable a cross bar l6 which connects 50
corresponding arms ll of bell crank levers 18
which are pivoted intermediate their arms on a
shaft l9 at the top of the bolster, one at each side
of the main frame. The other arms of the bell
cranks are connected by a U-shaped handle 20. 55
2,130,939
The parts are so related that when the elevating
platform B is in its lowermost position as shown
in Figures 1 and 4, and the handle 20 is in sub
stantially a vertical plane, the cross bar It is in
the upper ends of the slots I5 of the links M and
forward swinging of the handle 20 will elevate the
platform as shown in Figure 5, whereupon, the
platform' being held in elevated position by a
latch about to be described, the handle may be
10 freely swung about the shaft [9 without move
ment of the platform, the cross bar [6 riding in
the slots l5.
.
bolts l2 passing through one pair of openings 3|,
the platform will be at one elevation as shown
in Figure 1; while upon reversing of the brackets
H and connecting them to the side pieces of the
platform B with the bolts passing through the UK
other set of openings 3!, the platform will be
disposed at a higher elevation as shown in Fig
ure 8.
vLift trucks of this general character usually in
clude a hydraulic check for retarding descent of 10
the elevating platform and my invention contem
‘ plates a novel and improved check.
As shown in
The elevating platform is held in its uppermost the drawings, the check includes a cylinder 32
position by a latch 2! which is pivotally mount . pivotally mounted at one end 33 on the rear axle 2
15 ed intermediate its ends on the shaft I91 and ‘ and havinga piston, 37!! reciprocable therein which 15
has at one end a hook 22 to engage over the rod _' has a piston ,rod 35 pivotally connected at 36 to
l3 at the forward end of the platform.
The other
end of the latch comprises, a treadle 23" for dis-)
the standard 28 on the elevating platform.
" The piston‘ comprises two plates 36 which are
engaging the hook 22 from the rod I3. A spring“ ‘riveted together and clamp between them a cup»
20 24 normally influences the‘ latch so as to bring ' packing washer 31 to engage the inner walls
the hook 22 in position to snap over the rod l3
of the cylinder and facing in the direction of
when the elevating platform reaches '_its .upper
movement of the piston as the'platforrn descends.
The piston has a limited sliding" movement'on
the rod 35, movement being limited in one
direction by a collar 38 and being limited in the
other direction by nuts 39. The inner end of the
latch from the rod l 3 in such a manner as to allow
piston rod has a longitudinal groove 40 leading
the‘ platform to suddenly descend under the beneath the nuts 39 and the piston 36 to the
weight thereon and cause possible injury to the .collar 38 and the collar has a packing washer
30 operator by sudden upswinging of the handle 20,
M to be abuttedby the piston. The cylinder is
I have provided a locking dog 25 which is piv
?lled with liquid such as oil, and when the plat
otally mounted at one end at 27 on a standard
form B is elevated, the piston rod-moves to the
28 at the forward end of the elevating platform, left of Figures 1 and 9_and the ‘piston during-the
the dog overlying the rod l3 as shown in Figures 4 initial movementof the rod slides into engage
35 and 5. The dog is held in this position by action
ment with the nuts 39 so as to permit the oil to
of gravity and is so spaced from the rod 53 that, ?ow through the groove 40. Some oil will also 35
the hook 22 may swing the dog rearwardly and flow around the edges of the packing washer 31.
then snap over the rod l3 when the plat-form B
When the elevating platform descends, the rod 35
reaches its uppermost position. The dog then moves in the opposite direction and upon initial
swings
by
gravity
into
a
position
over
the
hook
40
movement the piston 34 slides against the packing
22 and is so spaced from the hook as to prevent
washer 4! to close the groove-40, and the packing
swinging of the hook upwardly sufficiently to dis~ washer 31 expands tightly against the cylinder
engage the hook from the rod l3, as shown in
wall to prevent‘the ?o-w‘of oil past the piston.
most position, the hook end-22 of the latch hav
ing a projection 25 to facilitate riding of the
25 hook'over the rod l 3.
To prevent accidental disengagement of the
Figure 5.
45
50
55
60
65
elevations.
70
,
Descent of the elevating platform is thereby re- .
The dog 25 is automatically thrown out of such tarded, but to permit slow movement of the plat
locking position as the handle 20 is raised, by form, the pistonhas a leak port‘ 42 which‘ allows
engagement of the dog by the cross bar it which the oil to ?ow slowly from one end, of the cylin
connects the bell cranks l8 as shown in Figure 6,
der to the otherin such a manner as to allow
whereupon the latch may be disconnected from
descent of the platform but at a slow rate.
the rod l3 and the. platform may be released for
' Obviously the truck may be moved from place
descent. It will be noted however, that at this to place by pulling on the handle 20, lateral pulls
time the handle is in substantially its uppermost causing the forward end of the truck to swing
vertical position with the cross rod H5 at the inner on the caster 4 to permit steering of the truck.
ends of the slots l5 in the lifting links it so that
While I’ have shown and described the inven—'
the descent of the platform will not have any
eifect upon swinging of the handle. All danger tion as embodied in certain details of construc
tion ‘it'should be understood that this is pri
to the operator is thereby eliminated. When. the marily
for the purpose of illustrating the princi
handle is again swung downwardly the dog will
ples
of
invention’ and that the details of
swing into its normal locking position by action structurethe
may be modi?ed by those skilled in the
of gravity as shown in Figure 4.
art without departing from the spirit or scope of 60
Another feature of the invention is an adjust
the claims;
7
able mounting of the elevating platform B. As
Having ‘thus described my invention, what I
shown, the forward parallel links 6 are connected claim is:‘ r
r
'
to the standard 28, and the side pieces 29 of the V 1. An elevating truck comprisinga wheeledv
elevating platform are bolted at 30 to the stand
main frame, an elevating platform mounted on
ard. The standard hasa plurality of vertically said main frame for movement vertically upon‘
spaced openings 3i so that the side pieces 29 being pulled forwardly, ‘a pair of links pivoted
can be connected to' the standard at different at one end on said platform, one at each side
I
n
The rear end of the ‘elevating platform carries
the brackets l l which have two pairs of openings
3i spaced different distances from the point of
journaling of the rod IS in the brackets.‘ .Ac
cordingly when the brackets are connected to the
side pieces of the elevating platform with the
thereof and having an elongated slot, and a
handle having a pair of rigidly connected bell
cranks pivoted to rotate about a horizontal axis
on, and one at‘each side of, said main frame,
and a, cross rod connecting‘corresponding arms
of said bell cranks and slidable in said slots so
that said‘ platform can ,be elevated by swinging
2,130,939
of said handle downwardly in one direction and
engagement of the outer ends of said slots by
said cross rod, and after elevation of the plat
form said handle may be swung upwardly and
said cross, rod may slide toward the other ends
of said slots to permit the platform to descend
with said links sliding idly over said cross rod
without effecting movement of the handle, and
means for releasably locking said platform in ele
~10
vated position.
2. An elevating truck comprising a wheeled
main frame, an elevating platform including side
pieces and a standard connected to said side pieces
at one end, a bracket secured to each side piece
adjacent the rear end thereof, a shaft journaled
in said brackets, a pair of parallel lifting links
pivotally connected at one end to said shaft and
at their other ends to the main frame, a second
pair of parallel links pivotally connected at one
end to said standard and at their other ends to
said main frame, means adjustably mounting
said brackets on said side pieces and means ad
justably mounting the side pieces vertically on
said standard to vary the height of the elevating
platform.
3. An elevating truck comprising a wheeled
main frame, an elevating platform including side
pieces and a standard connected to said side
pieces at one end, a bracket secured to each side
piece adjacent the rear end thereof, a shaft
3
with said sets of openings in the side pieces to
receive bolts for connecting the brackets to the
side pieces in different positions and vary the
height of the platform, said standard having a
plurality of sets of bolt holes at each side and
each side piece having a set of bolt holes to se
lectively cooperate with said sets of holes in the
standard and receive bolts for connecting said
side pieces to said standard at different heights.
4. An elevating truck comprising a wheeled 10
main frame, an elevating platform mounted on
said main frame for movement vertically upon
being pulled" forwardly, a pair of links each
pivoted at one end on said platform at one side
thereof and having an elongated slot adjacent
its other end, and a handle having a pair of
rigidly connected bell cranks pivoted to rotate on
a horizontal axis on said main frame and a cross
rod connecting corresponding arms of said bell
cranks and slidable in said slots in the links so
that said platform can be elevated by swinging
of said handle downwardly in one direction and
engagement of the outer ends of said slots by
said cross rod, and after elevation of the plat
form said handle may be swung upwardly and
said cross rod may slide toward the other ends
of said slots to permit the platform to descend
without affecting movement of the handle, a
latch on said main frame to engage a part on
said platform for holding said platform in ele
journaled in said brackets, a pair of parallel lift
ing links pivotally connected at one end to said
shaft and at their other ends to the main frame,
a second pair of parallel links pivotally connected
vated position, a locking dog on said platform
at one end to said standard and at their other
when the platform is locked in elevated position
the dog is directly engaged by said cross rod of
the handle as the'handle is swung upwardly and
reaches the position for beginning elevation of the
ends to said main frame, each side piece having
a set of bolt openings and each bracket having a
plurality of sets of bolt openings spaced different
distances from the point of journaling of said
4.0 shaft in said brackets to selectively cooperate
30
actuated by gravity into position to lock said latch
in holding position when the platform is elevated,
said dog being located on the platform so that
platform.
.
ARTHUR E. WILLIAMS.
40
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