Patent US3825295A successfully refreshed from Google Patents.
US3825295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Truck cab latch
Assignee: Paccar Inc
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Filing: 1972-04-03
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Granted: 1974-07-23
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Expires: 1992-04-03
Abstract
Abstract A latch mechanism for use upon a cab over engine truck which is adapted to be unlatched upon introduction of fluid under pressure to the cylinders which raise the cab and yet is designed to latch and remain secure under pulling, twisting or application of pressure different from the sequence predetermined to unlatch. The latch is adapted to withstand great pressure without damage to the structure. The hook of the mechanism is spring biased towards the latched condition, during the unlatching operation the bias is overridden, and the mechanism permits reliable latching with a short operating stroke.
Inventors
- 👤 J Saunders
- 👤 D Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:22
CPC Classifications
B; B62; B62D; B62D33/00; B62D33/06; B62D33/063; B62D33/067; B62D33/07; B62D33/071; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/0911; Y10T292/0913; Y10T292/0914
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
256 words
A latch mechanism for use upon a cab over engine truck and mounted to the rear portion of the cab and the adjacent framework comprising; a latch pin horizontally mounted to either the frame or the cab of the truck, a fluid operated latch mounted to interact with the latch pin when the cab is in the lowered position, said latch comprising a hollow housing having an opening through its lower surface and an inwardly extending lip surrounding the opening, a ram mounted to the top of the housing having its push rod extendable through the housing toward the opening, a latch mounting plate having trunnion supports extending from one face thereof and the other face abutting the upper surface of the housing beneath the ram, a heavy duty compression spring mounted between the mounting plate and the lip continuously urging the plate against the top of the housing, a latch hook pivotally mounted to the trunnion supports having a lower portion to engage the latch pin and a pair of opposed ears extending at approximately right angles to the latch pin and a second compression spring mounted between the ears of the latch and the mounting plate, said spring being mounted offset from the axis of movement of the latch providing a moment about the axis urging the latch to its closed position, and stop means secured to the housing to contact the offset spring and move the latch to an open position when the ram is actuated thus enabling the cab to be opened.
Claim 2
Dependent Claim
256 words
A latch mechanism for use upon a cab over engine truck and mounted to the rear portion of the cab and the adjacent framework comprising; a latch pin horizontally mounted to either the frame or the cab of the truck, a fluid operated latch mounted to interact with the latch pin when the cab is in the lowered position, said latch comprising a hollow housing having an opening through its lower surface and an inwardly extending lip surrounding the opening, a ram mounted to the top of the housing having its push rod extendable through the housing toward the opening, a latch mounting plate having trunnion supports extending from one face thereof and the other face abutting the upper surface of the housing beneath the ram, a heavy duty compression spring mounted between the mounting plate and the lip continuously urging the plate against the top of the housing, a latch hook pivotally mounted to the trunnion supports having a lower portion to engage the latch pin and a pair of opposed ears extending at approximately right angles to the latch pin and a second compression spring mounted between the ears of the latch and the mounting plate, said spring being mounted offset from the axis of movement of the latch providing a moment about the axis urging the latch to its closed position, and stop means secured to the housing to contact the offset spring and move the latch to an open position when the ram is actuated thus enabling the cab to be opened.
Claim 3
Dependent Claim
15 words
A latch mechanism as in claim 1 and further including a manually operable safety latch.
Claim 4
Dependent Claim
28 words
A latch mechanism as in claim 1 wherein one extending latch hook ear is curved upwardly to capture the spring even when the latch is in open position.
Claim 5
Dependent Claim
217 words
A latch mechanism adapted to secure two relatively movable bodies in proximate relation comprising; a first portion secured to one body and having a relatively fixed latch pin, a second portion secured to the other body and including a pivotally mounted latch hook movable from a latched to an unlatched position, means for actuating the latch hook comprising relatively heavy duty first biasing means continuously urging the latch hook along a relatively vertical path to a latched position, fluid operated means selectively urging the latch hook to an unlatched position, a second biasing means mounted to continuously urge the hook transversely toward the latch position and means positioned to override the first biasing means whereby the latch hook will be moved linearly along a vertical path away from the pin and then pivoted causing transverse movement so the hook will clear the pin and allow the bodies to move away from from each other, both the first biasing means and the second biasing means extensible by relative movement of the two bodies when the latch pin and the latch hook are in a latched position without damage to the mechanism, said second portion including substantial reach, thereby allowing the heavy duty biasing means to operate through its stroke in the latched condition without causing damage or unlatching.
Claim 6
Dependent Claim
217 words
A latch mechanism adapted to secure two relatively movable bodies in proximate relation comprising; a first portion secured to one body and having a relatively fixed latch pin, a second portion secured to the other body and including a pivotally mounted latch hook movable from a latched to an unlatched position, means for actuating the latch hook comprising relatively heavy duty first biasing means continuously urging the latch hook along a relatively vertical path to a latched position, fluid operated means selectively urging the latch hook to an unlatched position, a second biasing means mounted to continuously urge the hook transversely toward the latch position and means positioned to override the first biasing means whereby the latch hook will be moved linearly along a vertical path away from the pin and then pivoted causing transverse movement so the hook will clear the pin and allow the bodies to move away from from each other, both the first biasing means and the second biasing means extensible by relative movement of the two bodies when the latch pin and the latch hook are in a latched position without damage to the mechanism, said second portion including substantial reach, thereby allowing the heavy duty biasing means to operate through its stroke in the latched condition without causing damage or unlatching.
Claim 7
Dependent Claim
74 words
A latch mechanism as in claim 4 wherein the first biasing means is a coil spring having its axis pass through the axis of pivot of the latch hook and the second biasing means is a compression spring of lighter duty than the first biasing means and is mounted with its axis offset from the axis of pivot of the latch hook generating a greater force pivoting the latch hook to the latched position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |