Elevator – industrial lift truck – or stationary lift for vehicle – Having fluid dampening means regulating load support movement
Patent
1998-12-24
2000-05-23
Hess, Douglas
Elevator, industrial lift truck, or stationary lift for vehicle
Having fluid dampening means regulating load support movement
187346, 187292, 187412, 187411, B66B 500
Patent
active
060655690
ABSTRACT:
A virtually active hitch system is provided for the damping of vertical oscillations of an elevator car during a semi-active hitch mode of operation along a relatively lengthy elevator travel path and for load leveling the elevator car during an active mode when the elevator is braked. The virtually active hitch stores energy derived from the elevator motor during the semi-active mode, and utilizes that stored energy during the active mode to actively adjust the positioning of the elevator car, as might result from load changes. The hitch assembly may advantageously use hydraulic piston and cylinder means to adjust, or impede adjustment of, a limited hitch gap between a support rope and the elevator car. The hydraulic circuit associated with the piston and cylinder may include a variable orifice valve to control damping action and a pair of accumulators controlled via a switching network to selectively store and release energy and to also serve as a spring.
REFERENCES:
patent: 838322 (1906-12-01), Groom
patent: 5027925 (1991-07-01), Kahkipuro
patent: 5542501 (1996-08-01), Ikejima et al.
patent: 5641041 (1997-06-01), Masuda et al.
patent: 5652414 (1997-07-01), Roberts et al.
patent: 5750945 (1998-05-01), Fuller et al.
patent: 5862888 (1999-01-01), Iwakiri et al.
Hess Douglas
McAllister Steven B.
Schneeberger Stephen A.
United Technologies Corporation
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