Patent US3690490A successfully refreshed from Google Patents.
US3690490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trailer construction
Assignee: Diversified Metals Inc
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Filing: 1971-01-12
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Granted: 1972-09-12
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Expires: 1991-01-12
Abstract
Abstract A trailer construction is provided in which a load supporting platform frame is shiftable rearwardly with respect to a supporting axle while its rearmost edge is pivoted downwardly to provide a resultant small angle of inclination between the platform frame and the ground surface to enable an easy movement of material to and from the platform frame and to serve as a stationary loading ramp.
Inventors
- 👤 Harry P Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:21
CPC Classifications
B; B60; B60P; B60P1/00; B60P1/04; B60P1/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
330 words
A trailer comprising first and second wheels connected by a common axle, support frame means supported by said axle, a shiftable platform frame for supporting a planar load platform on its upper surface, pivotable means connecting the rearmost end of a towing tongue means to a forward portion of said platform frame means, tongue latching means for latching said tongue in position extending substantially parallel to said platform frame, roller means mounting said platform frame on said support frame for movement between a forward position in which a major portion of said platform frame is positioned forwardly of said axle and a rearward position in which a major portion of said platform frame extends rearwardly of said axle whereby said platform frame is pivotable downwardly to engage its rearmost edge with a supporting surface with the angle of inclination between the platform frame and the supporting frame being substantially less when said platform frame is in its rearward position than would be the case with the platform frame in its forward position to consequently enable an easy loading and unloading of objects carried by said platform frame, latch means for retaining said platform frame in its forward position, intermediate brace means pivotally connected to a rearward portion of said platform frAme and a linkage means connecting said brace means to said support frame for moving a portion of said brace means into engagement with the supporting surface in response to movement of said platform frame to its rearward position concurrently with pivotal movement of said support frame about the axis of said axle, so that said intermediate brace means provides support for said platform frame intermediate the rearmost end edge of said platform frame and the engagement point between said platform frame and said roller means and abutment means on said support frame and stop means on said platform frame engageable with said abutment means for limiting the forward position of said platform frame with respect to said support frame.
Claim 2
Dependent Claim
330 words
A trailer comprising first and second wheels connected by a common axle, support frame means supported by said axle, a shiftable platform frame for supporting a planar load platform on its upper surface, pivotable means connecting the rearmost end of a towing tongue means to a forward portion of said platform frame means, tongue latching means for latching said tongue in position extending substantially parallel to said platform frame, roller means mounting said platform frame on said support frame for movement between a forward position in which a major portion of said platform frame is positioned forwardly of said axle and a rearward position in which a major portion of said platform frame extends rearwardly of said axle whereby said platform frame is pivotable downwardly to engage its rearmost edge with a supporting surface with the angle of inclination between the platform frame and the supporting frame being substantially less when said platform frame is in its rearward position than would be the case with the platform frame in its forward position to consequently enable an easy loading and unloading of objects carried by said platform frame, latch means for retaining said platform frame in its forward position, intermediate brace means pivotally connected to a rearward portion of said platform frAme and a linkage means connecting said brace means to said support frame for moving a portion of said brace means into engagement with the supporting surface in response to movement of said platform frame to its rearward position concurrently with pivotal movement of said support frame about the axis of said axle, so that said intermediate brace means provides support for said platform frame intermediate the rearmost end edge of said platform frame and the engagement point between said platform frame and said roller means and abutment means on said support frame and stop means on said platform frame engageable with said abutment means for limiting the forward position of said platform frame with respect to said support frame.
Claim 3
Dependent Claim
29 words
The invention of claim 1 wherein said box frame members are respectively connected at each end to the ends of leaf spring means medially connected to said axle member.
Claim 4
Dependent Claim
30 words
The invention of claim 2 wherein the rearmost ends of said box frame members are connected to the rearmost ends of said leaf spring means by a pivotal link member.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |