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Title:
METHOD AND APPARATUS FOR SYNCHRONIZING A VEHICLE LIFT
Document Type and Number:
WIPO Patent Application WO2003086942
Kind Code:
A3
Abstract:
A vehicle lift (2) control maintains multiple points (4, 6) of a lift system within the same horizontal plane during vertical movement of the lift engagement structure by synchronizing the movement thereof. A vertical trajectory is compared to actual positions (24, 26) to generate a raise (46, 48) signal. A position synchronization circuit (38) synchronizes the vertical actuation of the moveable lift components by determining a proportional-integral error signal. Also disclosed are proportional control valves (12, 14) or alternatively variable speeds pumps (122, 130), to which the output of the synchronization circuit is applied. The synchronization circuit can be applied to two or four lifting points.

Inventors:
GREEN STEVEN D (US)
PORTER DAVID P (US)
Application Number:
PCT/US2003/011236
Publication Date:
March 04, 2004
Filing Date:
April 10, 2003
Export Citation:
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Assignee:
CAPITAL FORMATION INC (US)
GREEN STEVEN D (US)
PORTER DAVID P (US)
International Classes:
B66F7/20; F15B9/17; F15B11/22; F15B15/28; (IPC1-7): B66F7/20; F15B11/22; F15B9/17
Domestic Patent References:
WO1995011189A11995-04-27
Foreign References:
US3967701A1976-07-06
DE3433136A11986-03-20
Other References:
PATENT ABSTRACTS OF JAPAN vol. 015, no. 404 (M - 1168) 15 October 1991 (1991-10-15)
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