Title: Fail safe mechanism for automatically de-energizing a multi-post vehicle hoist

Abstract: The lifting mechanisms of each of a plurality of columns of a vehicle hoist are synchronously driven by an endless member which may have its power source on one of the columns. A switch to energize and de-energize the power source has a control arm that is coupled, through a lost motion mechanism, to a trigger-like, normally inactive safety mechanism that is held cocked by a safety rod. A rotary idler carried by the safety rod is biased against the endless member in a direction to withdraw the rod from the safety mechanism in the event of a break in the endless member, releasing the trigger energy to effect shifting of the power source switch to the off position by overriding actuation of the lost motion coupling mechanism.

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Other info:

Inventors: Perkins, William V. (Monrovia, CA, US)

Application Number: 518100
Filing Date: 1974-10-25
Publication_date: 1976-05-25
Assignee: Maxon Industries, Inc. (Huntington Park, CA)
Primary Class(es): 187/209 187/214, 254/89R
Other Classes:
US Patent Ref:

1585596	May, 1926	Menges	187/8.
1699785	Jan, 1929	Geiger	187/29.
1990241	Feb, 1935	Mizer	187/29.
2184801	Dec, 1939	McCarthy	187/8.
2230745	Feb, 1941	Eiselstein	198/232.
2624546	Jan, 1953	Haumerson	187/8.
2639784	May, 1953	Strock	187/8.
2843223	Jul, 1958	Villars	187/8.
2932382	Apr, 1960	James	198/232.
3291260	Dec, 1966	Woor	187/8.
3687234	Aug, 1972	Gendreau	187/8.
3799292	Mar, 1974	Katz	187/25.

Other Refs:
Primary Examiner: Blunk, Evon C.
Assistant Examiner: Rowland, James L.
Attorney: Mueller; Frederick E.