Land vehicles – Wheeled – Attachment
Patent
1997-07-02
1999-11-16
Swann, J. J.
Land vehicles
Wheeled
Attachment
192 8921, 192 69, 188 83, 254424, 403305, 403383, B60S 908, B60S 922
Patent
active
059843535
ABSTRACT:
The quick-release arrangement includes a coupler adapted to slidably engage a braked upper drive shaft and to slidably engage a lower drive shaft. The lower drive shaft is coupled to an associated jack leg such that when the upper drive shaft, the coupler, and the lower drive shaft are coupled together, the jack leg is braked. A spring urges the coupler into engagement with the lower drive shaft. A cam member supports the downwardly-biased coupler and permits the coupler to be cammed upward against the spring bias force such that the coupler slides along the upper drive shaft and, thus, out of engagement with the lower drive shaft. When it is desired to release the jack leg from the braking control of the upper drive shaft to thereby permit rapid lowering of the jack leg to the ground, a cam lever is used to easily overcome the spring bias force and effect camming. Inadvertent camming is prevented because the spring bias force is not overcome by normal vibration, jolting or jarring. Braking control of the upper drive shaft can be effected in various manners. For example, the upper drive shaft can be coupled to a motor that provides an inherent brake mechanism. Alternatively, a mechanical braking mechanism can provide braking control to the upper drive shaft such that operation of the cam member to disengage the upper drive shaft from the lower drive shaft releases the lower drive shaft from the braking control and permits the jack leg to be rapidly lowered to the ground. The present invention provides such a mechanical braking mechanism that cooperates with the quick-release arrangement for use when necessary or desired.
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Ririe Andrew J.
Swann J. J.
LandOfFree
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