Patent US3567054A successfully refreshed from Google Patents.
US3567054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power-operated tilt-up lift fork
Assignee: Cascade Corp
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Filing: 1968-09-19
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Granted: 1971-03-02
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Expires: 1988-09-19
Abstract
Abstract A lift truck with pivoted lift forks in which each lift fork has a pivot connection mounting the fork adjacent the base of a carriage in the lift truck. The pivot connection accommodates swinging of the fork between lowered and raised positions. An upright hydraulic ram disposed rearwardly of the pivot connection for the fork is provided for swinging the fork. The ram is connected to the fork through a movable link which moves to a position releasably holding the fork in its raised position on adjustment of the ram to raise the fork.
Inventors
- 👤 Cornelis A Emke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:08
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/12; B66F9/16; B66F9/165
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
In a lift truck comprising an upright mast assembly including a vertically shiftable carriage with such having: an upright front plate; an elongated lift fork; pivot means supported on and disposed forwardly of said plate pivoting said fork adjacent one of its ends at a location adjacent the base of the plate for swinging between lowered and raised positions about a substantially horizontal axis extending transversely of the truck; said fork when in its said lowered position extending substantially horizontally forwardly from the truck, and in its said raised position being upright; an elongated substantially upright ram located rearwardly of said plate, and operatively interposed between said plate and said fork, operable to swing the fork under power from its said lowered to its said raised position; and fork retaining means operatively interposed between said fork and said ram including a movable part which moves toward a position effective to hold said fork in its said raised position independently of said ram on adjustment of the ram to raise the fork.
Claim 2
Dependent Claim
171 words
In a lift truck comprising an upright mast assembly including a vertically shiftable carriage with such having: an upright front plate; an elongated lift fork; pivot means supported on and disposed forwardly of said plate pivoting said fork adjacent one of its ends at a location adjacent the base of the plate for swinging between lowered and raised positions about a substantially horizontal axis extending transversely of the truck; said fork when in its said lowered position extending substantially horizontally forwardly from the truck, and in its said raised position being upright; an elongated substantially upright ram located rearwardly of said plate, and operatively interposed between said plate and said fork, operable to swing the fork under power from its said lowered to its said raised position; and fork retaining means operatively interposed between said fork and said ram including a movable part which moves toward a position effective to hold said fork in its said raised position independently of said ram on adjustment of the ram to raise the fork.
Claim 3
Dependent Claim
48 words
The lift truck of claim 1, wherein said ram includes a cylinder mounted above said plate, and a rod extenDing downwardly from said cylinder, and which further comprises means extending along the rear side of said plate operatively interconnecting said rod and said one end of said fork.
Claim 4
Dependent Claim
55 words
The lift truck of claim 2, wherein said pivot means is supported on said plate through an elongated upright member mounted on the front face of the plate, said member extends upwardly to an upper end located above the top of the plate, and said cylinder is mounted on said member adjacent said upper end.
Claim 5
Dependent Claim
123 words
The lift truck of claim 1, wherein said ram includes a rod positioned above and extending downwardly toward said one end of said fork, there is an elongated upright bar operatively connected to and extending downwardly from said rod, and said movable part comprises an elongated link having one end pivoted to said bar and its other end pivoted to said one end of said fork, said link occupying an upright position with its longitudinal axis substantially paralleling the longitudinal axis of said bar with the fork in its said lowered position, and occupying a generally horizontal position with its longitudinal axis disposed at substantially a right angle to the longitudinal axis of the bar with the fork in its said raised position.
Claim 6
Dependent Claim
53 words
The lift truck of claim 4, wherein said fork retaining means further comprises an upright member disposed adjacent and rearwardly of said link, said member being constructed to guide said one end of said link for movement along a substantially upright path with adjustment of said ram to raise and lower the fork.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |