Patent US3727774A successfully refreshed from Google Patents.
US3727774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift truck
Assignee: Standard Manufacturing Co
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Filing: 1970-09-01
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Granted: 1973-04-17
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Expires: 1990-09-01
Abstract
Abstract A lift truck includes a rear engine, a hydrostatic drive unit mounted just forward of the engine, and an article lifting mechanism mounted just forward of the hydrostatic drive unit. The engine drives the hydrostatic drive unit, and the hydrostatic drive unit propels the lift truck through a pair of rear wheels. The lift truck is guided by a steering mechanism that manipulates a pair of front wheels. An operating compartment is positioned over the hydrostatic drive unit and includes controls for the hydrostatic drive unit, the lifting mechanism and the steering mechanism.
Inventors
- 👤 M Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:46
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/065
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
254 words
In a lift truck, the combination of: a frame including a forward U-shaped portion comprising a pair of substantially parallel, longitudinally extending arms and a transversely extending base interconnecting the rear ends of the arms; a prime mover mounted on the frame to the rear of the U-shaped portion thereof; transmission means mounted on the frame in the spaCe between the prime mover and the base of the U-shaped portion of the frame and operatively connected to the prime mover; a pair of non-steerable drive wheels positioned on opposite sides of the transmission means for supporting the rear end of the lift truck on a surface and operatively connected to the transmission means and hence to the prime mover for actuation thereby to propel the lift truck over the surface; a pair of non-driven steering wheels mounted at the front ends of the arms of the U-shaped portion of the frame to support the front end of the lift truck on the surface, said steering wheels being independently supported on the arms to define an entirely open area extending upwardly from the surface between the arms and between the steering wheels; a boom pivotally supported on the base of the U-shaped portion of the frame for manipulation within said open area; article receiving and supporting means mounted on the distal end of the boom; and an operating compartment positioned on the frame to the rear of the base of the U-shaped portion thereof and including means for controlling the orientation of the front steering.
Claim 2
Dependent Claim
254 words
In a lift truck, the combination of: a frame including a forward U-shaped portion comprising a pair of substantially parallel, longitudinally extending arms and a transversely extending base interconnecting the rear ends of the arms; a prime mover mounted on the frame to the rear of the U-shaped portion thereof; transmission means mounted on the frame in the spaCe between the prime mover and the base of the U-shaped portion of the frame and operatively connected to the prime mover; a pair of non-steerable drive wheels positioned on opposite sides of the transmission means for supporting the rear end of the lift truck on a surface and operatively connected to the transmission means and hence to the prime mover for actuation thereby to propel the lift truck over the surface; a pair of non-driven steering wheels mounted at the front ends of the arms of the U-shaped portion of the frame to support the front end of the lift truck on the surface, said steering wheels being independently supported on the arms to define an entirely open area extending upwardly from the surface between the arms and between the steering wheels; a boom pivotally supported on the base of the U-shaped portion of the frame for manipulation within said open area; article receiving and supporting means mounted on the distal end of the boom; and an operating compartment positioned on the frame to the rear of the base of the U-shaped portion thereof and including means for controlling the orientation of the front steering.
Claim 3
Dependent Claim
51 words
The lift truck according to claim 1 wherein the prime mover comprises an internal combustion engine and the transmission means comprises a hydrostatic drive unit interconnecting the engine and the rear drive wheels and substantially filling the space between the engine and the base of the U-shaped portion of the frame.
Claim 4
Dependent Claim
56 words
The lift truck according to claim 1 further including at least one hydraulic pump driven by the prime mover and at least one hydraulic cylinder connected between the frame and the boom for manipulating the boom within the open area between the arms of the U-shaped portion of the frame and the steering wheels mounted thereon.
Claim 5
Dependent Claim
178 words
The lift truck according to claim 1 further comprising: hydraulic pump means driven by the prime mover; a linkage including first bell crank means pivotally supported at the front ends of the arms of the U-shaped portion of the frame and in turn supporting the front steering wheels, a pair of first tie rods having front ends connected to the first bell crank means and extending rearwardly therefrom along the arms of the U-shaped portion of the frame, second bell crank means pivotally supported on the frame and connected to the rear ends of the first tie rods, and a second tie rod extending along the base of the U-shaped portion of the frame and interconnecting the second bell crank means; at least one hydraulic cylinder for actuating the linkage to control the orientation of the front steering wheels; and valve means operable from within the operating compartment of the lift truck to control the flow of hydraulic fluid from the hydraulic pump means to the hydraulic cylinder and thereby controlling the orientation of the front steering wheels.
Claim 6
Dependent Claim
176 words
A lift truck comprising: a frame having a pair of substantially parallel arms extending from its front end to define an entirely open area therebetween; a pair of steering wheels mounted on the front ends of the arms of the frame to support the front end of the lift truck; a boom pivotally supported on the frame for manipulation in the open area between the arms thereof; an engine supported at the extreme rear end of the frame; hydrostatic drive means operatively connected to the engine and occupying substantially the entire space between the front of the engine and the pivotal connection of the boom to the frame whereby the overall length of the lift truck is minimized; a pair of rear drive wheels positioned on opposite sides of the hydrostatic drive means and operatively connected to the hydrostatic drive means and hence to the engine for operation thereby to propel the lift truck; and an operating compartment positioned over the hydrostatic drive means and including means for controlling the orientation of the front steering wheels.
Claim 7
Dependent Claim
176 words
A lift truck comprising: a frame having a pair of substantially parallel arms extending from its front end to define an entirely open area therebetween; a pair of steering wheels mounted on the front ends of the arms of the frame to support the front end of the lift truck; a boom pivotally supported on the frame for manipulation in the open area between the arms thereof; an engine supported at the extreme rear end of the frame; hydrostatic drive means operatively connected to the engine and occupying substantially the entire space between the front of the engine and the pivotal connection of the boom to the frame whereby the overall length of the lift truck is minimized; a pair of rear drive wheels positioned on opposite sides of the hydrostatic drive means and operatively connected to the hydrostatic drive means and hence to the engine for operation thereby to propel the lift truck; and an operating compartment positioned over the hydrostatic drive means and including means for controlling the orientation of the front steering wheels.
Claim 8
Dependent Claim
107 words
The lift truck according to claim 5 further comprising: hydraulic pump means driven by the engine; a linkage connected to the front steering wheels and extending rearwardly along the arms of the frame and then transversely across the frame for constraining the steering wheels to substantially identical angular relationships with respect to the frame; hydraulic cylinder means connected to the linkage for controlling the orientation of the steering wheels relative to the frame; and valve means mounted in the operating compartment for controlling the flow of hydraulic fluid from the hydraulic pump means to the hydraulic cylinder means and thereby controlling the orientation of the steering wheels.
Claim 9
Dependent Claim
69 words
The lift truck according to claim 5 further including: hydraulic pump means driven by the engine; hydraulic cylinder means connected between the frame and the boom; and valve means mounted on the operating compartment for controlling the flow of hydraulic fluid between the hydraulic pump means and the hydraulic cylinder means and thereby controlling the manipulation of the boom in the open area between the arms of the frame.
Claim 10
Dependent Claim
49 words
The lift truck according to claim 7 further comprising: article receiving and supporting means mounted on the distal end of the boom; and means for maintaining a predetermined orientation of the article receiving and supporting means during manipulation of the boom under the action of the hydraulic cylinder means.
Claim 11
Dependent Claim
42 words
The lift truck acording to claim 8 wherein the article receiving and supporting means is adapted to receive and support an aerial weapon and comprises means for permitting selective rotation of the weapon relative to the boom about three mutually perpendicular axes.
Claim 12
Dependent Claim
234 words
A lift truck comprising: a frame including a forward U-shaped portion comprising a pair of substantially parallel, longitudinally extending arms and a transversely extending base interconnecting the rear ends of the arms; a pair of non-driven steering wheels mounted at the front ends of the arms of the U-shaped portion of the frame for supporting the front end of the lift truck; a linkage including portions extending along the arms and a portion extending along the base of the U-shaped portion of the frame for maintaining the steering wheels in a parallel relationship with respect to the frame; the U-shaped portion of the frame, the front steering wheels, and the linkage thereby defining an entirely opened area between the arms of the U-shaped portion of the frame; a boom pivotally supported on the base of the U-shaped portion of the frame for vertical manipulation in said open area; a prime mover mounted on the frame to the rear of the base of the U-shaped portion thereof; transmission means operatively connected to the prime mover; a pair of non-steerable drive wheels operatively connected to the transmission means and hence to the prime mover for actuation thereby to propel the vehicle, and an operating compartment positioned on the frame to the rear of the base of the U-shaped portion thereof and including means for manipulating the linkage to control the orientation of the front steering wheels.
Claim 13
Dependent Claim
234 words
A lift truck comprising: a frame including a forward U-shaped portion comprising a pair of substantially parallel, longitudinally extending arms and a transversely extending base interconnecting the rear ends of the arms; a pair of non-driven steering wheels mounted at the front ends of the arms of the U-shaped portion of the frame for supporting the front end of the lift truck; a linkage including portions extending along the arms and a portion extending along the base of the U-shaped portion of the frame for maintaining the steering wheels in a parallel relationship with respect to the frame; the U-shaped portion of the frame, the front steering wheels, and the linkage thereby defining an entirely opened area between the arms of the U-shaped portion of the frame; a boom pivotally supported on the base of the U-shaped portion of the frame for vertical manipulation in said open area; a prime mover mounted on the frame to the rear of the base of the U-shaped portion thereof; transmission means operatively connected to the prime mover; a pair of non-steerable drive wheels operatively connected to the transmission means and hence to the prime mover for actuation thereby to propel the vehicle, and an operating compartment positioned on the frame to the rear of the base of the U-shaped portion thereof and including means for manipulating the linkage to control the orientation of the front steering wheels.
Claim 14
Dependent Claim
84 words
The lift truck according to claim 10 further comprising; hydraulic pump means driven by the prime mover for supplying hydraulic fluid under pressure; hydraulic cylinder means connected between the frame and the boom for manipulating the boom in the open area between the arms of the U-shaped portion of the frame, and valve means mounted in the operating compartment for controlling the flow of hydraulic fluid from the hydraulic pump means to the hydraulic cylinder means and thereby controlling the manipulation of the boom.
Claim 15
Dependent Claim
54 words
The lift truck according to claim 11 further including: hydraulic cylinder means connected between the linkage and the frame; and valve means mounted in the operating compartment for controlling the flow of hydraulic fluid fRom the hydraulic pump means to the hydraulic cylinder means and thereby controlling the orientation of the front steering wheels.
Claim 16
Dependent Claim
56 words
The lift truck according to claim 12 further comprising: article receiving and supporting means mounted on the distal end of the boom; and means for maintaining a predetermined orientation of the article and receiving and supporting means during manipulation of the boom in the open area between the arms of the U-shaped portion of the frame.
References Cited (Backward Citations)
DE653079C
Cited
US2613822A
Cited
US2833362A
Cited
US3024933A
Cited
US3005562A
Cited
US3087630A
Cited
US3303901A
Cited
US3484964A
Cited
US3484004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |