US3721318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift trucks
Assignee: Total Power Hydraulics Ltd
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Filing: 1971-03-19
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Granted: 1973-03-20
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Expires: 1991-03-19
Abstract
Abstract In an industrial lift truck a first assembly comprising a mast structure and driven wheels is detachably mounted on one end of a prime mover, and a second assembly comprising steerable wheels and a counterweight is detachably mounted on the other end of the prime mover. The prime mover thus acts as part of a chassis of the truck. The first assembly comprises a tank which is attached to the prime mover and on which the mast structure and driven wheels are mounted. The tank thus acts as a further part of a chassis. The driven wheels are coupled with the prime mover by an hydrostatic transmission which includes a pump disposed within the tank, the latter acting as a reservoir for the pump.
Inventors
- 👤 J Warrender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:58
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/07554; B66F9/07513; B66F9/07518; B66F9/07572; B66F9/07595; B66F9/08; B66F9/082; B60; B60G; B60G2300/00; B60G2300/02; B60G2300/022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
190 words
In a lift truck comprising: a. a prime mover, b. at least three ground-engaging wheels, at least one of which is coupled with the prime mover to be driven thereby, and c. a mast structure including a load-lifting means also arranged to be driven from the prime mover, the improvement wherein the prime mover is mounted directly between d. a first assembly which comprises the mast structure and at least two of said wheels, and which is attached to one end of the prime mover, said first assembly including a tank adapted to act as a reservoir for hydraulic fluid and formed with: i. means for attaching the tank to the prime mover, ii. mounting means for the mast structure, and iii. mounting means for tHe wheels comprised by the first assembly, whereby the tank acts also as a part of a chassis of the truck, and e. a second assembly which comprises the remainder of the wheels and a counterbalance weight, and which is attached to the other end of the prime mover, the prime mover constituting the sole load-bearing connection between the first assembly and the second assembly.
Claim 2
Dependent Claim
190 words
In a lift truck comprising: a. a prime mover, b. at least three ground-engaging wheels, at least one of which is coupled with the prime mover to be driven thereby, and c. a mast structure including a load-lifting means also arranged to be driven from the prime mover, the improvement wherein the prime mover is mounted directly between d. a first assembly which comprises the mast structure and at least two of said wheels, and which is attached to one end of the prime mover, said first assembly including a tank adapted to act as a reservoir for hydraulic fluid and formed with: i. means for attaching the tank to the prime mover, ii. mounting means for the mast structure, and iii. mounting means for tHe wheels comprised by the first assembly, whereby the tank acts also as a part of a chassis of the truck, and e. a second assembly which comprises the remainder of the wheels and a counterbalance weight, and which is attached to the other end of the prime mover, the prime mover constituting the sole load-bearing connection between the first assembly and the second assembly.
Claim 3
Dependent Claim
50 words
A lift truck according to claim 1 wherein the first assembly further comprises: a. at least one hydraulic motor drivingly coupled with said wheels comprised by the first assembly, and b. an hydraulic pump disposed within said tank and arranged for supplying fluid from the tank to said hydraulic motor.
Claim 4
Dependent Claim
55 words
A lift truck according to claim 2 wherein: a. the second assembly comprises a sub-frame attached to the prime mover, b. the, or each, wheel comprised by the rear assembly is mounted on the sub-frame for steering movement relative thereto about a generally upright axis, and c. the counterbalance weight is secured to the sub-frame.
Claim 5
Dependent Claim
20 words
A lift truck according to claim 1 wherein the first and second assemblies are detachably mounted on the prime mover.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |