Patent US3989276A successfully refreshed from Google Patents.
US3989276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jack stand
Assignee: Individual
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Filing: 1975-05-19
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Granted: 1976-11-02
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Expires: 1995-05-19
Abstract
Abstract A mounting plate enables the stand to be mounted to any standard hitch bar. A front leg is pivoted by the upper end thereof to the front of the plate and extends downwardly and rearwardly thereof, terminating in a curved ground engaging skid. Over-center linkage is pivoted between the skid and the mounting plate extending upwardly and rearwardly towards said mounting plate when in the extended position. A lever action makes or breaks the over-center linkage thereby extending or retracting the jack stand.
Inventors
- 👤 Arthur J. Hamerl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:33
CPC Classifications
B; B60; B60S; B60S9/00; B60S9/02; B60S9/04; B60D; B60D1/00; B60D1/24; B60D1/42; B60D1/46; B60D1/465
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
246 words
A jack stand for attachment to a standard hitch bar comprising in combination a mounting plate component, said component including a channel section having a web and a flange extending at right angles from each side edge of said web, said channel section engaging under said hitch bar with said web on the under side of said hitch bar and said flanges depending downwardly one upon each side of said hitch bar, front and rear pivot pins bearably engaging between said flanges below said hitch bar, a ground engaging skid plate mounted for pivotal action by one end thereof to said front pivot pin, said ground engaging skid plate extending downwardly and rearwardly from said front pivot pin, an over-center locking linkage mounted for pivotal action by one end thereof to said rear pivot pin and by the other end thereof to adjacent the other end of said skid plate, said over-center locking linkage extending upwardly and rearwardly from said lower end of said skid plate towards said rear pivot pin when in the extended position, said over-center locking linkage including a lower portion having a bifurcated upper end, bearing sleeves formed on said upper end, an upper portion, said upper portion, having a bearing pin secured to the lower end thereof and engaging said bearing sleeve, and an over-center linkage stop extending from said bearing pin, said stop having transverse extensions engaging said bifurcated end of said lower portion when in the extended supporting position.
Claim 2
Dependent Claim
246 words
A jack stand for attachment to a standard hitch bar comprising in combination a mounting plate component, said component including a channel section having a web and a flange extending at right angles from each side edge of said web, said channel section engaging under said hitch bar with said web on the under side of said hitch bar and said flanges depending downwardly one upon each side of said hitch bar, front and rear pivot pins bearably engaging between said flanges below said hitch bar, a ground engaging skid plate mounted for pivotal action by one end thereof to said front pivot pin, said ground engaging skid plate extending downwardly and rearwardly from said front pivot pin, an over-center locking linkage mounted for pivotal action by one end thereof to said rear pivot pin and by the other end thereof to adjacent the other end of said skid plate, said over-center locking linkage extending upwardly and rearwardly from said lower end of said skid plate towards said rear pivot pin when in the extended position, said over-center locking linkage including a lower portion having a bifurcated upper end, bearing sleeves formed on said upper end, an upper portion, said upper portion, having a bearing pin secured to the lower end thereof and engaging said bearing sleeve, and an over-center linkage stop extending from said bearing pin, said stop having transverse extensions engaging said bifurcated end of said lower portion when in the extended supporting position.
Claim 3
Dependent Claim
199 words
A jack stand for attachment to a standard hitch bar comprising in combination a mounting plate component, a ground engaging skid plate pivoted by one end thereof to adjacent one end of said mounting plate component and extending downwardly and rearwardly therefrom, an over-center locking linkage pivoted by one end thereof to adjacent the lower end of said skid plate and by the other end thereof to adjacent the other end of said mounting plate component, said locking linkage extending upwardly and rearwardly from said lower end of said skid plate, towards said mounting plate when in the extended position, and means operatively connected to said locking linkage for making and breaking same thereby moving said stand from an extended, supported position to a retracted storage position and vice versa, said over-center linkage including a lower portion having a bifurcated upper end, bearing sleeves formed on said upper end, an upper portion, said upper portion having a bearing pin secured to the lower end thereof and engaging said bearing sleeves and an over-center locking stop extending from said bearing pin, said stop having transverse extensions engaging said bifurcated ends of said lower portion when in the extended supported position.
Claim 4
Dependent Claim
199 words
A jack stand for attachment to a standard hitch bar comprising in combination a mounting plate component, a ground engaging skid plate pivoted by one end thereof to adjacent one end of said mounting plate component and extending downwardly and rearwardly therefrom, an over-center locking linkage pivoted by one end thereof to adjacent the lower end of said skid plate and by the other end thereof to adjacent the other end of said mounting plate component, said locking linkage extending upwardly and rearwardly from said lower end of said skid plate, towards said mounting plate when in the extended position, and means operatively connected to said locking linkage for making and breaking same thereby moving said stand from an extended, supported position to a retracted storage position and vice versa, said over-center linkage including a lower portion having a bifurcated upper end, bearing sleeves formed on said upper end, an upper portion, said upper portion having a bearing pin secured to the lower end thereof and engaging said bearing sleeves and an over-center locking stop extending from said bearing pin, said stop having transverse extensions engaging said bifurcated ends of said lower portion when in the extended supported position.
Claim 5
Dependent Claim
115 words
The stand according to claim 2 in which said mounting plate comprises a length of channel having a web and a pair of spaced and parallel flanges extending one from each side of said web and at right angles thereto, said channel engaging under the associated hitch bar with said flanges extending downwardly upon each side thereof, means to detachably clamp said channel to said hitch bar, said means operatively connected to said over-center locking linkage including a lever operatively connected by one end thereof to the upper end of said linkage and means connected to said lever for pivoting said stand from said extended supporting position to said retracted storage position and vice versa.
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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |