US3826470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trailer jack
Assignee: B A L PROD CORP
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Filing: 1973-05-21
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Granted: 1974-07-30
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Expires: 1993-05-21
Abstract
Abstract In trailer jacks of the scissors type which include a support leg having one end thereof coupled to an elongated screw mounted for rotation in a horizontal frame, the leg being selectively lowered to a supporting position by advancing the one end along the screw and pivoting at the center thereof to a transverse frame member extending horizontally transverse from the frame, the improvement comprising triangular web structures formed in common with the link members to provide column support to said leg when extended. It is specifically contemplated that the web structure further provide longitudinal flanges along the adjacent interior edges thereof, the flanges forming radial extensions from a common central pivot of the leg. At the distal ends the link members include pivotal joints attaching to the extreme ends of the transverse member. In this manner a column structure is formed between the extreme ends of the transverse member of said frame and the central pivot of said leg for providing lateral support to said leg when extended.
Inventors
- 👤 R Spear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:23
CPC Classifications
B; B60; B60S; B60S9/00; B60S9/02; B60S9/04; B60S9/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
In a scissors jack of the type adapted to be affixed to the bottom surface of a vehicle including a first frame member disposed in a horizontal alignment, a screw received in said first frame member longitudinal therewith, a support leg threadably engaging said screw in pivotal attachment at one end thereof, and a second frame member attached to said first frame member horizontally normal therewith, the improvement comprising: support link means disposed for pivotal engagement between a point substantially central to said support leg and the distal ends of said second frame member, including triangular structures having exterior flanges providing said pivotal connections and interior flanges extending along said first frame meber to abut said second frame member.
Claim 2
Dependent Claim
119 words
In a scissors jack of the type adapted to be affixed to the bottom surface of a vehicle including a first frame member disposed in a horizontal alignment, a screw received in said first frame member longitudinal therewith, a support leg threadably engaging said screw in pivotal attachment at one end thereof, and a second frame member attached to said first frame member horizontally normal therewith, the improvement comprising: support link means disposed for pivotal engagement between a point substantially central to said support leg and the distal ends of said second frame member, including triangular structures having exterior flanges providing said pivotal connections and interior flanges extending along said first frame meber to abut said second frame member.
Claim 3
Dependent Claim
25 words
A scissors jack according to claim 1 wherein: said support link means further include a rigid web structure formed between said exterior and interior flanges.
Claim 4
Dependent Claim
30 words
A scissors jack according to claim 2 wherein: said exterior and interior flanges are joined in common at one ends thereof proximate said pivotal point central to said support leg.
Claim 5
Dependent Claim
51 words
A scissors jack according to claim 3 wherein: said second frame member including planar structures at the distal ends in normal alignment to the longitudinal axis thereof; said exterior flange is formed to provide parallel surfaces at the other end thereof disposed to engage in pivotal engagement said planar structures therebetween.
Claim 6
Dependent Claim
191 words
In a trailer jack of the scissors type including a first frame member adapted to be attached to the bottom surface of a trailer, a second frame member attached in a transverse relationship to one end of said first frame member, a screw mounted for rotation along the longitudinal axis of said first frame member, a support leg pivotally and threadably engaging at one end thereof said screw and laterally opposing link members pivotally attached between the respective ends of said second frame member and a point central to said support leg, the improvement comprising: said link members each including an inner flange connected at one end to the point central of said leg and disposed for pivotal motion in a plane parallel to the longitudinal axis of said leg having the other end thereof in abutting relation to said second frame member, an outer flange connected at one end to the one end of said inner flange and extending to pivotally connect at the other end thereof to the distal ends of said second frame member and a planar web structure disposed to extend between said inner and outer flanges.
Claim 7
Dependent Claim
191 words
In a trailer jack of the scissors type including a first frame member adapted to be attached to the bottom surface of a trailer, a second frame member attached in a transverse relationship to one end of said first frame member, a screw mounted for rotation along the longitudinal axis of said first frame member, a support leg pivotally and threadably engaging at one end thereof said screw and laterally opposing link members pivotally attached between the respective ends of said second frame member and a point central to said support leg, the improvement comprising: said link members each including an inner flange connected at one end to the point central of said leg and disposed for pivotal motion in a plane parallel to the longitudinal axis of said leg having the other end thereof in abutting relation to said second frame member, an outer flange connected at one end to the one end of said inner flange and extending to pivotally connect at the other end thereof to the distal ends of said second frame member and a planar web structure disposed to extend between said inner and outer flanges.
Claim 8
Dependent Claim
29 words
A scissors jack according to claim 5 wherein: the axis of pivotal Motion of said outer flange is substantially parallel to the longitudinal axis of said second frame member.
Claim 9
Dependent Claim
62 words
A scissors jack according to claim 6 wherein: said second frame member includes an L-section extrusion aligned to receive at the interior thereof the other end of said inner flange; and said inner flange includes a semi-circular end of said outer flange, said end structure being dimensioned to a radius terminating at tangents coincident with the inner surfaces of said L-section extrusion.
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |