Patent US3770323A successfully refreshed from Google Patents.
US3770323A
Expired / Lapsed
US
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Vehicle jack
Assignee: Motors Liquidation Co
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Filing: 1971-09-14
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Granted: 1973-11-06
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Expires: 1991-09-14
Abstract
Abstract A vehicle jack includes a cam member adapted to be secured by a pair of nut and bolt arrangements to a first spare wheel segment mounted on a vehicle wheel housing carrying a flattened tire. The cam member mounts an elongated ground engaging friction member that extends circumferentially about the wheel housing axis with the configuration substantially of a logarithmic spiral for a predetermined circumferential angle. One end of the logarithmic spiral portion is positioned radially inward of the wheel housing to allow mounting of the jack without ground interference, while the other end is positioned adjacent the ground engaging surface of the first spare wheel segment. An initial rotational movement of the wheel housing moves the one end of the logarithmic spiral portion into ground engagement with a predetermined friction angle between the ground and a radius vector from the wheel housing axis to the point of ground engagement. During continued rotational movement of the wheel housing through the predetermined circumferential angle, the logarithmic spiral portion rolls along the ground and the jack lifts the wheel housing while the friction angle remains generally constant to minimize the maximum frictional force developed between the ground and the friction member. This minimization reduces the possibility of slippage between the friction member and the ground to ensure effective operation of the jack. Further rotational movement of the wheel housing moves the first spare wheel segment into ground engagement as the other end of the logarithmic spiral portion moves out of ground engagement, allowing detachment of the jack and mounting of a cooperable second spare wheel segment to provide a spare wheel that allows vehicle use prior to repair of the flattened tire.
Inventors
- 👤 M Isaacson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:51
CPC Classifications
B; B60; B60B; B60B11/00; B60B11/10; B60B2900/00; B60B2900/70; B60B2900/731
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
A vehicle jack comprising, a cam member, means adapted to mount the cam member relative to a vehicle for rotational movement about a transverse vehicle axis, and an elongated ground engaging friction member mounted on the cam member extending circumferentially about the transverse vehicle axis and including a ground engaging surface with the configuration of a logarithmic spiral for a circumferential angle of approximately 120* , the logarithmic spiral portion of the friction member being engageable with the ground with a predetermined friction angle between the ground and a radius vector from the rotational axis to the point of ground engagement, the logarithmic spiral portion of the friction member rolling along the ground to lift the vehicle during rotational movement of the cam member through the circumferential angle while the friction angle Remains generally constant to minimize the maximum frictional force developed between the ground and the friction member and thus prevent slippage therebetween.
Claim 2
Dependent Claim
154 words
A vehicle jack comprising, a cam member, means adapted to mount the cam member relative to a vehicle for rotational movement about a transverse vehicle axis, and an elongated ground engaging friction member mounted on the cam member extending circumferentially about the transverse vehicle axis and including a ground engaging surface with the configuration of a logarithmic spiral for a circumferential angle of approximately 120* , the logarithmic spiral portion of the friction member being engageable with the ground with a predetermined friction angle between the ground and a radius vector from the rotational axis to the point of ground engagement, the logarithmic spiral portion of the friction member rolling along the ground to lift the vehicle during rotational movement of the cam member through the circumferential angle while the friction angle Remains generally constant to minimize the maximum frictional force developed between the ground and the friction member and thus prevent slippage therebetween.
Claim 3
Dependent Claim
174 words
A vehicle jack comprising, a cam member, means adapted to mount the cam member on a vehicle wheel housing, and an elongated ground engaging friction member mounted on the cam member extending circumferentially about the wheel housing axis and including a ground engaging surface with the configuration of a logarithmic spiral for a circumferential angle of approximately 120*, the logarithmic spiral portion of the friction member having one end positioned radially inward of the wheel housing to allow mounting of the cam member without ground interference, the one end of the logarithmic spiral portion being engageable with the ground with a predetermined friction angle between the ground and a radius vector from the wheel housing axis to the point of ground engagement, the logarithmic spiral portion of the friction member rolling along the ground to lift the wheel housing during rotational movement thereof through the circumferential angle while the friction angle remains generally constant to minimize the maximum frictional force developed between the ground and the logarithmic spiral portion and thus prevent slippage therebetween.
Claim 4
Dependent Claim
174 words
A vehicle jack comprising, a cam member, means adapted to mount the cam member on a vehicle wheel housing, and an elongated ground engaging friction member mounted on the cam member extending circumferentially about the wheel housing axis and including a ground engaging surface with the configuration of a logarithmic spiral for a circumferential angle of approximately 120*, the logarithmic spiral portion of the friction member having one end positioned radially inward of the wheel housing to allow mounting of the cam member without ground interference, the one end of the logarithmic spiral portion being engageable with the ground with a predetermined friction angle between the ground and a radius vector from the wheel housing axis to the point of ground engagement, the logarithmic spiral portion of the friction member rolling along the ground to lift the wheel housing during rotational movement thereof through the circumferential angle while the friction angle remains generally constant to minimize the maximum frictional force developed between the ground and the logarithmic spiral portion and thus prevent slippage therebetween.
Claim 5
Dependent Claim
243 words
A vehicle jack comprising, a cam member, means adapted to removably mount the cam member on a vehicle wheel housing, and an elongated ground engaging friction member mounted on the cam member extending circumferentially about the wheel housing axis and including a ground engaging surface with the configuration of a logarithmic spiral for a circumferential angle of approximately 120*, the logarithmic spiral portion of the friction member having one end positioned radially inward of the wheel housing to allow mounting of the cam member without ground interference and having the other end thereof positioned radially outward of the wheel housing so as to be positionable substantially adjacent the ground engaging surface of a wheel housing mounted spare wheel segment, the one end of the logarithmic spiral portion being engageable with the ground with a predetermined friction angle between the ground and a radius vector from the wheel housing axis to the point of ground engagement, the logarithmic spiral portion rolling along the ground to lift the wheel housing during rotational movement thereof through the circumferential angle while the friction angle remains generally constant to minimize the maximum frictional force developed between the ground and the logarithmic spiral portion and thus prevent slippage therebetween, further rotational movement of the wheel housing moving the spare wheel segment into engagement with the ground to thus support the wheel housing and allow removal of the jack and mounting of another spare wheel segment on the wheel housing.
Claim 6
Dependent Claim
243 words
A vehicle jack comprising, a cam member, means adapted to removably mount the cam member on a vehicle wheel housing, and an elongated ground engaging friction member mounted on the cam member extending circumferentially about the wheel housing axis and including a ground engaging surface with the configuration of a logarithmic spiral for a circumferential angle of approximately 120*, the logarithmic spiral portion of the friction member having one end positioned radially inward of the wheel housing to allow mounting of the cam member without ground interference and having the other end thereof positioned radially outward of the wheel housing so as to be positionable substantially adjacent the ground engaging surface of a wheel housing mounted spare wheel segment, the one end of the logarithmic spiral portion being engageable with the ground with a predetermined friction angle between the ground and a radius vector from the wheel housing axis to the point of ground engagement, the logarithmic spiral portion rolling along the ground to lift the wheel housing during rotational movement thereof through the circumferential angle while the friction angle remains generally constant to minimize the maximum frictional force developed between the ground and the logarithmic spiral portion and thus prevent slippage therebetween, further rotational movement of the wheel housing moving the spare wheel segment into engagement with the ground to thus support the wheel housing and allow removal of the jack and mounting of another spare wheel segment on the wheel housing.
Claim 7
Dependent Claim
42 words
The vehicle jack of claim 3 wherein the other end of the logarithmic spiral portion is spaced from the wheel housing axis by a distance substantially equal to the rolling radius of a tire adapted to be supported by the wheel housing.
Claim 8
Dependent Claim
28 words
The vehicle jack of claim 3 wherein the cam member is adapted to be mounted on the spare wheel segment and thus fixed relative to the wheel housing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |