US4021012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jack stand
Assignee: ACROFORM
•
Filing: 1976-06-18
•
Granted: 1977-05-03
•
Expires: 1996-06-18
Abstract
Abstract A telescoping jack stand made of stamped metal parts with a pair of angularly extending legs which are pivotally mounted with respect to each other. The legs define an aperture between the legs with inwardly extending integral teeth. A central column member includes matching teeth and corresponding in shape and dimension with the aperture between the two legs. The central column includes recesses corresponding to the integral teeth of the legs. The legs are pivoted with respect to each other so that upon engagement of the teeth with the recesses in the column, additional load tends to pivot the teeth into greater engagement with the column and provide improved stability.
Inventors
- 👤 Jack V. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:03
CPC Classifications
B; B66; B66F; B66F19/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
135 words
A jack stand comprising a pair of legs; each leg including a portion extending laterally to provide a base for support of the jack stand when said legs are spread partially apart; means pivotally mounting said legs to move to a position generally adjacent to each other, outward to an extreme support position; the upper ends of said legs defining a substantially closed tubular portion; said leg portions including inwardly extending teeth in spaced opposite juxtaposition within said aperture; a tubular member dimensioned to pass through said aperture with the surface of said tube member in close proximity to said teeth; said tube member including recess portions interlocking with said teeth when the upper portion of said legs are positioned defining said aperture; the upper end of said tube including means for holding a load.
Claim 2
Dependent Claim
135 words
A jack stand comprising a pair of legs; each leg including a portion extending laterally to provide a base for support of the jack stand when said legs are spread partially apart; means pivotally mounting said legs to move to a position generally adjacent to each other, outward to an extreme support position; the upper ends of said legs defining a substantially closed tubular portion; said leg portions including inwardly extending teeth in spaced opposite juxtaposition within said aperture; a tubular member dimensioned to pass through said aperture with the surface of said tube member in close proximity to said teeth; said tube member including recess portions interlocking with said teeth when the upper portion of said legs are positioned defining said aperture; the upper end of said tube including means for holding a load.
Claim 3
Dependent Claim
32 words
The combination in accordance with claim 1 wherein said upper portion of said legs cooperate to define a substantially constant cross section tubular portion when the leg portions are in supporting positions.
Claim 4
Dependent Claim
40 words
The combination in accordance with claim 2 when said column member includes laterally extending portions above and below said opening of said tubular portion defined by said leg portions whereby said column member may not be disengaged from said legs.
Claim 5
Dependent Claim
36 words
The combination in accordance with claim 1 wherein said legs include a plurality of equally spaced teeth extending along the length of said aperture and wherein said column includes a number of recesses extending there along.
Claim 6
Dependent Claim
42 words
The combination in accordance with claim 4 wherein each of said legs includes a different number of teeth from the recesses in said column whereby the relative height of said column with respect to the base of said legs may be selected.
Claim 7
Dependent Claim
23 words
The combination in accordance with claim 1 wherein said leg members are pivotally mounted to rotate to substantially enclose said column for storage.
Claim 8
Dependent Claim
41 words
The combination in accordance with claim 2 wherein the leg members each include generally coplanar surfaces when in support position cooperating to form a substantially flat rectangular flanged support surface, thereby providing a stable planar surface against the floor in use.
Claim 9
Dependent Claim
26 words
The combination in accordance with claim 1 wherein said tubular column member is of rectangular cross sectional shape and said legs define a substantially rectangular aperture.
References Cited (Backward Citations)
US1105910A
Cited
US1267741A
Cited
US2183427A
Cited
US2297316A
Cited
US3162410A
Cited
US3802658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |