US3616953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Narrow-aisle truck with retractable arms
Assignee: Caterpillar Industrial Inc
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Filing: 1969-04-14
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Granted: 1971-11-02
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Expires: 1989-04-14
Abstract
Abstract A narrow-aisle lift truck with a wheelbase which can be varied by hydraulic cylinders operable to extend and retract movable arms upon which are mounted nonsteerable wheels.
Inventors
- 👤 Walter M Shaffer
- 👤 John T Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:55
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
A load-carrying truck comprising a self-propelled chassis having at least one steerable wheel thereon, wheel base changing means comprising a pair of arms retractably mounted on said chassis and on which are rotatably fixed a pair of nonsteerable wheels, a pair of lifting forks vertically movably mounted on said chassis, means fixed to the chassis for extending and retracting the arms, and brake means associated with both steerable and nonsteerable wheels so that when either the steerable or nonsteerable wheels are braked, the nonbraked wheels are moved toward the braked wheels when the extending and retracting means is actuated.
Claim 2
Dependent Claim
99 words
A load-carrying truck comprising a self-propelled chassis having at least one steerable wheel thereon, wheel base changing means comprising a pair of arms retractably mounted on said chassis and on which are rotatably fixed a pair of nonsteerable wheels, a pair of lifting forks vertically movably mounted on said chassis, means fixed to the chassis for extending and retracting the arms, and brake means associated with both steerable and nonsteerable wheels so that when either the steerable or nonsteerable wheels are braked, the nonbraked wheels are moved toward the braked wheels when the extending and retracting means is actuated.
Claim 3
Dependent Claim
30 words
The truck of claim 1 including a sideshifter carriage to which the forks are fastened so that they may be moved in a direction perpendicular to the truck''s longitudinal axis.
Claim 4
Dependent Claim
13 words
The truck of claim 1 wherein the number of steerable wheels is two.
Claim 5
Dependent Claim
122 words
A load-carrying truck comprising a self-propelled chassis defining front and rear ends, at least one steerable wheel on the rear end of said chassis, a pair of arms retractably mounted on the front end of said chassis, a pair of nonsteerable wheels mounted on said arms, mast means mounted on the front end of said chassis and vertically, movably supporting load forks, means for extending and retracting said arms whereby the truck wheelbase may be changed, and brake means associated with both steerable and nonsteerable wheels so that when either the steerable or nonsteerable wheels is braked, the nonbraked wheels are moved toward the braked wheels when the extending and retracting means is actuated thereby moving the chassis to the braked wheels.
Claim 6
Dependent Claim
122 words
A load-carrying truck comprising a self-propelled chassis defining front and rear ends, at least one steerable wheel on the rear end of said chassis, a pair of arms retractably mounted on the front end of said chassis, a pair of nonsteerable wheels mounted on said arms, mast means mounted on the front end of said chassis and vertically, movably supporting load forks, means for extending and retracting said arms whereby the truck wheelbase may be changed, and brake means associated with both steerable and nonsteerable wheels so that when either the steerable or nonsteerable wheels is braked, the nonbraked wheels are moved toward the braked wheels when the extending and retracting means is actuated thereby moving the chassis to the braked wheels.
Claim 7
Dependent Claim
23 words
The truck of claim 4 wherein the mast means comprises a pivotally mounted mast, a sideshifter carriage and means to sideshift said carriage.
Claim 8
Dependent Claim
13 words
The truck of claim 4 wherein the number of steerable wheels is two.
Claim 9
Dependent Claim
17 words
The truck of claim 4 wherein the means for extending and retracting the arms comprises hydraulic means.
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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |