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Патент USA US2411556

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Nov. 26, 1946.
C. S. SCHROEDER
2,411,556
TRUCK v
Filed Feb. 1, 1945
5 Sheets-Sheet 1
INVI'I-ZNTOR
6.5. So?roaOQr
BY/CWQMM
, ATTORNEY
Nov. 26, 1946-
2,41 1,556
c. s. SCHROEDER
TRUCK
5 Sheets-Sheet 2
Filed Feb. 1, 1945
BY
QLéJM/W
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ATTORNEY
Nov. 26, 1946-
c. s. SCHROEDER
2,411,556 '
TRUCK
Filed Feb. 1, 1945
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Nov. 26, 1946.
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2,411,555
TRUCK
Filed Feb. 1, 1945
5 Sheets-Sheet 4
INVENTOR
C.J.\Tc/:ra¢O/Z/'
BY
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'
Wm
ATTORNEY
Nov. 26, 1946.
c. s. ‘SCHROEDER
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Filed Feb. ‘1, 1945
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2,411,556
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5 Sheets-Sheet 5
BY."
1:
ATTORNEY
2,411,556
Patented Nov. 26, 1946
UNITED STATES PATENT OFFICE
2,411,556
TRUCK
Charles S. Schroeder, Philadelphia, Pa., assignor
to The Yale & Towne Manufacturing Com
pany, Stamford, Conn, a corporation of Con
necticut
Application February 1, 1945, Serial No. 575,622 "
15 Claims. (Cl. 214-65)
2
This invention relates to an industrial truck of
the type used in industrial plants for the lifting
and transporting of heavy loads. The invention
relates more particularly to a truck of the type
in which a traction unit is utilized, the traction
unit having assembled as an integral part thereof
a motor, a transmission and an axle drive unit.
In certain trucks of the particular class, the
traction unit has heretofore been secured in a
conventional manner as through a series of
mounting pads holding the traction unit in place
I have thus outlined the general nature of my
invention and its relation to the prior art in or
der that the description thereof that follows may
be better understood, and in order that my con
tribution to the art may be better appreciated.
There are, of course, additional features of my ‘*
invention that will be described hereinafter and.
which will form the subject of the claims ap
pended hereto. Those skilled in the art will ap
preciate that the conception on which my disclo
sure is based, may readily be utilized ‘by those
skilled in the art as the basis for the designing
of other structures for carrying out the several
on the main frame. Ulinski, in his Patent No.
2,207,688, owned by The Yale & Towne Manu
purposes of my invention. It is important, there
facturing Company to which this application is
assigned, discloses a truck of the class in which 15 fore, that the claims to be granted me shall be
of suillcient breadth to prevent the appropriation
the traction unit is mounted for rotation bodily
of my invention by those skilled in the art.
about the axis of the axles of the traction unit,
Referring now to the drawings wherein one
with means secured to a part of the traction unit
form of my invention is illustrated, Fig. 1 is an
for accepting the drive torque of the unit. In
Ulinski, the truck has tilting uprights on which is 20 elevation and partial sectionof a truck embody
ing my invention. Fig. 2 is an enlarged eleva
mounted a vertically moving carriage, the tilting
tion and partial section of a part of the truck il
uprights being mounted on the traction unit and
lustrating an equalizer bar at one side of the
for rotation about the axis of the traction axles.
motor. Fig. 3 is a section taken along lines 3-3
I have found that it is highly desirable to
mount the traction unit for rotation relatively to 25 of Fig. 2. Fig. 4 is a view looking downwardly
- on the main frame of the truck. Fig. 5 is a sec
the frame of the truck as in Ulinski, but about
an axis displaced linearily from the axis of rota- '
tion taken along lines 5_—5 of Fig. 4. ‘Fig. 6 is
a section taken along lines 6-6 of Fig. 2. Fig. '7
is a perspective view of the two equalizer bars
sible to mount the load-carrying uprights of the
‘truck on the traction unit in such a position that 30 and the parts secured thereto.
Referring‘ now more particularly to the draw
the weight of the uprights will tend to rotate
ings, and more especially Figs. 1, 4 and 5, the
the traction unit in a direction opposed to that
main frame of my truck is designated by refer
in which the traction unit tends to rotate be
ence numeral l0, and is preferably fabricated
cause of its weight and form. It is, therefore,
seen that the weight of the load and the uprights 35 through the welding of a series of structural steel
members. This is a preferred type of fabrica
serves to balance the weight of the traction unit,
tion of the traction or drive axles. It is then pos
tion now used in trucks of the class described
and it is, of course, subject to change as pro
duction volumes vary and as various manufactur
‘ ‘This operating condition makes it possible to
use a relatively light and resilient means for se 40 ing methods are developed. I-shall not refer to
the details of the construction of the frame ill
curing the traction unit against rotation relatively
of the truck, because my invention is quite in
to the main frame about the pivot shafts through
' dependent of the details of the frame. For an
which it is mounted on the main frame. A fea
understanding of the invention, it is merely nec
ture of my invention resides in the means where
by the traction unit is thus secured to the main 45 essary to understand that the frame is adapted
to mount the entire traction unit for pivotal
frame. More particularly, this feature of my in
movement relatively thereto, with means extend
vention resides in the utilization of a pair of
ing between the frame and the traction unit for
equalizer bars that may be secured to the traction
preventing such pivotal movement except within
unit,v preferably to the motor thereof, in several
places, but which are supported in but two places 60 very narrow limits as determined by resilient
means.
on the frame of the truck.
For mounting the traction unit for pivotal
Even more particularly, this feature of my in
and thereby to establish a very satisfactory op
erating condition.
vention resides in the utilization of relatively
springy equalizer bars and relatively resilient
means for securing the equalizer bars to the main
frame of the truck.
'
movement relatively to the main frame, the main
frame has a pair of longitudinally extending
brackets ll. formed integrally therewith and
equipped with bearing surfaces l2 cooperating
2,411,556
3
with bearing surfaces l2a on bearing capslla.
The axle drive unit of the traction unit T is
designated by numeral I4, and has a plate l4a
extending therefrom at each lateral side thereof.
Stub shafts l3 supported between the surfaces
l2 and I 2a mount the plates Ma and thus the
axle drive unit 14 of the traction unit T for piv
otal movement relatively to the brackets l l _ The
drive wheels W of the traction unit rotate be
tween the brackets II and outside frame mem
bers Illa.
The traction unit T, in addition to the axle
drive l4, includes an internal combustion engine
46 each block 36 is then secured by bolt 43 in
assembled relation to one of the pads 40.
It is now apparent that through the equalizer
bars 30, the traction unit is secured at two op~
posed points to the main frame. It is also quite
apparent that while thus secured, the equalizer
bars may move within the range of movement
permitted by the resilient sleeves 39. It is also
well to note that the equalizer bars are them
10 selves formed su?lciently thin so as to be springy
in nature. Incidentally, further details regard
ing the construction of the resilient sleeves 39 and
their functioning with respect to the sleeves 3B
and blocks 36, is not set forth because such rubber
l5 and a conventional transmission l6. These
three parts of the traction unit T are secured to 15 sleeves are well known in the art and per se are
form an integral structure that through the stub
not my invention. I believe that I have now fulll7 >
shafts I3 is rotatable relatively to the main frame
disclosed Just how the traction unit is mounted
It! and the brackets II thereof as already set
for pivotal movement on the main frame ID of
the truck and just how the traction unit is held
forth. It will be noted that the axis of rotation
is substantially displaced from the axis A of the 20 against substantial pivotal movement and for the
acceptance of the drive torque.
drive axles of the traction unit.
Trucks of the particular class are adapted to
At this point it may be well to indicate that the
carry tilting uprights on which a carriage is
motor I5 is of conventional design and is adapted
through a belt l8, as shown in Fig. 3, to actuate a
mounted for vertical movement. In my truck,
pump H! for developing the hydraulic pressure 25 such vertical uprights are illustrated in Fig. 1 and
- utilized in operating the usual tilting and lifting
are designated by the reference numeral 50.
Each upright is formed with a bracket 5| whereby
mechanism found in trucks of the class described.
through a stub shaft 52 it is mounted for pivotal
There is also shown in Fig. 3 steering mechanism
movement on one of the plates l4a, it having
20 for steering the wheels 2|, adapted for actua~
tion by the usual steering wheel 22 found in 30 been previously indicated that the axle drive unit
I4 is formed with a plate I 4a at each side thereof.
trucks of this type. In Fig. 1 there is shown a
For tilting the uprights 50, there is utilized a con
gear shift lever 23 and a clutch pedal 24. A
ventional tilting mechanism that I designate gen
brake pedal is, of course, utilized, but is not show-n
in the drawings.
erally by the reference numeral 53, it being
As has already been indicated generally, some 35 thought that further description thereof is un
means must be providedfor accepting the drive
necessary here. A conventional load carriage 54
is adapted for vertical movement on the uprights
torque of the traction unit T and to hold the unit
50 through the usual means well known in the art
against rotation about the stub shafts l3. The
and to which reference need not here be made.
means preferred by me comprise a pair of equal
It will be noted that the stub shafts 52 are so
izer bars best illustrated in Fig. 7, each equalizer 40
positioned relatively to the stub shafts 13, that
bar being designated by reference numeral 30.
the weight of the uprights 50 and the carriage
The front ends of the equalizer bars 30 are con
54 will tend to rotate the entire traction unit T
nected by a saddle 3| while the rear ends are con
nected by a rear saddle 32.
clockwise in Fig. 1 relatively to the main frame
The forward saddle 3| may be secured, as best 45 about the stub shafts I3. On the other hand, the
shown in Fig. 3, to parts of the engine l5 by
weight of the traction unit will tend to rotate the
means of the four bolts 33. It will be noted in = ‘traction unit counterclockwise relatively to the
Fig. 3 that the left hand bolts 33 are secured to
main frame about the stub shafts l3. Therefore,
it is apparent that the weight of the uprights and
a bracket 34 extending from the engine l5 while
the right hand bolts 33 enter a part of the engine 50 carriage will tend to balance the weight of the
traction uni-t insofar as the said weights tend to
l5 threaded for that purpose. If desired, the
equalizer bars 30 may be formed with ?anges so
rotate the traction unit clockwise and counter
that the bolts 33 will pass through integral por
clockwise relatively to the main frame. Because
of this relationship of the parts it is possible to
tions of the equalizer bars, and thus eliminate the
forward connection formed through saddle 3|. 55 use the relatively light and springy equalizer bars
The rear ends of the equalizer bars 30 are each
30 with all their attendant advantages, since much
secured by a pair of bolts 35 to the engine I 5 as
of the weight of the traction unit will be balanced
is probably best seen in Figs. 2 and 7.
by the uprights 50 and the carriage 54.
Each'of the equalizer bars 30 has bolted thereto
I believe that the construction and operation
as is best seen in Figs. 2, 6 and 7, a block 36, bolts 60 of my invention will now be apparent .to those
31 being utilized for the purpose. Each block 36
skilled in the art.
I now claim:
is bored for housing a sleeve 38 that is bonded to
a rubber sleeve 39. This rubber sleeve 39 ex
1. In a truck of the class described, a main
frame, a traction unit comprising a motor and
tends above sleeve 38 and also downwardly below
the sleeve 38 so as to bear the full weight of the 65 a transmission and an axle drive unit having
axles for driving traction wheels at each side of
engine and equalizer bar 30 and block 36 when
said axle drive unit, a pair of opposed pivot shafts
placed on a pad 40. As shown best in Fig. 4, pad
mounting said axle drive unit and therefore said
40 is welded to the main frame It] at 4|, there
being, of course, two of these pads 40, one for 70 entire traction unit for pivotal movement on op
posed parts of said main frame and with said
each of the equalizer bars 30. Preferably also,
pivot shafts displaced linearly from the axis of the
the pads 40 are connected by a reinforcing bar 42.
axles of said drive unit, and means securing said
A bolt 43 passes centrally of each rubber sleeve 39
traction unit to said main frame at a point dis
into threaded assembled relation to one of the
placed from said pivot shafts for accepting the
pads 40. Through a nut 44 and washers 45 and 76 drive torque of said traction unit.
2,411,558
5
frame, a traction unit comprising a. motor and a
transmission and an axle drive unit having axles
for driving traction wheels at each side of said
axle drive unit, means pivotally mounting said
traction unit on said main frame, an equalizer
2. In a truck of the class described, a main
frame, a traction unit comprising a motor and ‘a
transmission and an axle drive unit having axles
for driving traction wheels at each side of said
axle drive unit, a pair of opposed pivot shafts
mounting said axle drive unit and therefore said
bar of thin relatively springy construction se
cured to the motor of said traction unit at each
side thereof, and a single mounting for each of
said equalizer bars at each side of said main
entire traction unit for pivotal movement on up
posed parts of said main frame and with said
pivot shafts‘. displaced linearly from the axis of
the axles of said drive unit, and resilient means
securing said traction unit to said main frame at
a point displaced from said pivot shafts for ac
cepting the drive torque of .said traction unit.
frame.
,
'
9. In a truck of the class described, a main
frame, a traction unit comprising a motor and
a transmission and an axle drive unit having
axles for driving traction wheels at each side of
3. In a truck of the class described, a main
frame, a traction unit comprising a motor and a 15 said axle drive unit, means pivotally mounting.
said traction unit on said main frame, an equal
transmission and an axle drive unit having axles
izer bar secured to the motor of said traction
unit at each side thereof, and a single resilient
mounting for each of said equalizer bars at each
entire traction unit for pivotal movement on op 20 side of said main frame.
10. In a truck of the class described, a main
posed parts of said main frame and with said
for driving traction wheels at each side of said
axle drive unit, a pair of opposed pivot shafts
mounting said axle drive unit and therefore said
pivot shafts displaced linearly from the axis of
frame, a traction unit comprising a motor and a
with said pivot shafts displaced linearly from the
axle drive unit at each side thereof, the points
of mounting of said uprights being so related
to said opposed pivot shafts that the weight of
said uprights will tend to rotate said traction
transmission and an axle drive unit having axles
the axles of said drive unit, a mounting member
for driving traction wheels at each side of said
secured to said traction unit at each side there
of, and a single mounting for each of said mount 25 axle drive unit, a pair of opposedypivot shafts
mounting said axle drive unit andttherefore said
ing members at each side of said main frame.
entire traction unit for pivotal movement on op
4.‘In a truck of the class described, a main
posed parts of said main frame and with said
frame, a traction unit comprising a motor and
pivot shafts displaced linearly from the axis of
a transmission and an axle drive unit having
axles for driving traction wheels at each side 30 the axles of said drive unit, means securing
said traction unit to said main frame at a point
of said axle drive unit. a pair of opposed pivot
' displaced from said pivot shafts for accepting
shafts mounting said axle drive unit and there
the drive torque of said traction unit, a pair of
fore said entire traction unit for pivotal move
carriage supporting uprights mounted on said
ment on opposed parts of said main frame and
axis of the axles of said drive unit, an equalizer
bar secured to the motor of said traction unit at
each side thereof, and a single mounting for each
of said equalizer bars at each side of said main
frame.
'
unit about said pivot shafts in a direction op
40 posed to that in which said traction unit tends
to rotate by‘ reason of its own weight.
11. In a truck of the class described,v a main
frame, a traction unit comprising a motor and a
a transmission and an axle drive unit haxlng
transmission and an axle drive unit having axles
axles for driving traction wheels at each side
of said axle drive unit, a pair of opposed pivot 45 for driving traction wheels at each side of said
axle drive unit, a pair of opposed pivot shafts
\shafts mounting said axle drive unit and there
mounting said axle drive unit and therefore said
fore said entire traction unit for pivotal move
entire traction unit for pivotal movement on
ment on opposed parts of said main frame and
5. In a truck of the class described, a main
frame, a traction unit comprising a motor and
with‘ said pivot shafts displaced linearly from
opposed parts of said main frame and with said
of, and a single mounting for each of said equal
reason of its own weight. I
izer bars at each side of said main frame.
'7. In a truck of the class described, a main
frame, a traction unit comprising a motor and
a transmission and an axle drive unit having
axles for driving traction wheels at each side
of said axle drive unit, means pivotally mount
ing said traction unit on said main frame, an 70
12. In a truck of the class described, a main
frame, a traction unit comprising a motor and a
transmission and an axle drive unit having axles
for driving traction wheels at each side of said
the axis of the axles of said drive unit, an equal 50 pivot shafts displaced linearly from the axis of
the axles of said drive unit, means securing said
izer bar secured to the motor of said traction
traction unit to said main frame at a point dis
unit at each side thereof, and a single resilient
placed from said pivot shafts for accepting the
mounting for each of said equalizer bars at
drive torque of said traction unit, a pair of car
each side of said mainframe.
6. In a truck of the class described, a main 56 riage supporting uprights, means mounting one
of said uprights for tilting movement on each
frame, atraction unit comprising a motor and
side of said axle drive unit, the point of mount
a transmission and an axle drive unit having
ing of said uprights being so related to said op
axles for driving traction wheels at each side of
posed pivot shafts that the weight of said up
said axle drive unit, means secured to portions
rights will tend to rotate said traction unit about
of said axle drive unit for mounting said trac
said pivot shafts in a direction opposed to that
tion unit on said main frame, an equalizer bar
in which said traction unit tends to rotate by
secured to said traction unit at each side there
equalizer bar secured to said traction unit at
each side thereof, and a single mounting for each
of said equalizer bars at each side of said main
frame.
‘
axle drive unit, a pair of opposed pivot shafts
mounting said axle drive unit and therefore said
entire traction unit for pivotal movement on
opposed parts of said main frame and with said
pivot shafts displaced linearly from the axis of
the axles of said drive unit, a pair of carriage
supporting uprights mounted on said rear axle
8. In a truck of the class described, a main 75 drive unit at each side thereof, the'points of
2,411,556
8
mounting of said uprights being so related to said
opposed pivot shafts that the weight of said
uprights will tend to rotate said traction unit
said main frame, means for accepting the torque
of said traction unit relatively to said main
frame and for holding said traction unit against
about said pivot shafts in a direction opposed to
pivoting movement because of the disposition of
that in which said traction unit tends to rotate
its weight relatively to said means mounting it
by reason of its own weight.
13. In a truck of the class described, a main
on said main frame, a pair of uprights, and
means tiltably mounting said uprights on said
axle drive unit at'points where the Weight of said
uprights will tend to rotate said traction unit on
its pivotal mounting‘ in a direction opposed to
that in which it tends to be rotated by the dis
frame, a traction unit comprising a motor and a
transmission and an axle drive unit having axles
for driving traction wheels at each side of said
axle drive unit, a pair of opposed pivot shafts
mounting said axle drive unit and therefore said
entire traction unit for pivotal movement on
position of its weight.
15. In a truck of the class described, a main
opposed parts of said main frame and with said
frame, a traction unit comprising a motor and
pivot shafts displaced linearly from the axis of
a transmission and an axle drive unit having
the axles of said drive unit, a pair of carriage
axles for driving traction wheels at eachmside
supporting uprights, means mounting one of
of said axle drive unit, means pivotally mount
said uprights for tilting movement on each side
ing said axle drive unit on said main frame
of said rear axle drive unit, the points of mount
whereby said entire traction unit may pivot on
ing of said uprights being so related to said op 20 said frame, resilient means for accepting the
posed pivot shafts that the weights of said up
torque of- said traction unit relatively to said
rights will tend to rotate said traction unit about
main frame and for holding said traction unit
said pivot shafts in a direction opposed to that
in which said traction unit tends to rotate by
reason of its own weight.
g
14. In a truck of the class described, a main
against substantial pivoting movement because
of the disposition of its weight relatively to said
25 means mounting it on said main frame, a pair of
uprights, and means tiltably mounting said up
rights on said axle drive unit at points where
a transmission and an axle drive unit having
the weight of said uprights will tend to rotate
axles for driving traction wheels at each side of
said traction unit on its pivotal mounting in a
said rear axle drive unit, means pivotally mount 30 direction opposed to that‘ in which it tends to
ing said axle drive unit on said main frame
be rotated by the disposition of its weight.
whereby said entire traction unit may pivot on
CHARLES S. SCHROEDER.
frame, a traction unit comprising a motor and
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