Elevator – industrial lift truck – or stationary lift for vehicle – Having fluid dampening means regulating load support movement
Patent
1996-12-04
1999-01-26
Young, Karen M.
Elevator, industrial lift truck, or stationary lift for vehicle
Having fluid dampening means regulating load support movement
187292, 187391, 187411, B66B 500
Patent
active
058628886
ABSTRACT:
Even if rope (13) and spring (15) oscillate, to suppress these oscillations as much as possible.
An elevator system is equipped with a car (1) that is installed such that it can freely move up and down in a hoistway, a sheave (14) that is installed at the top of the hoistway, a rope (13) for pulling the car that is suspended from this sheave (14), a suspension rod (9) to which the end of this rope (13) is attached, a spring (15) for damping vibrations which is installed between this suspension rod (9) and the car (1), a cylinder device (16) which attenuates the vibrations and has a flow volume control valve (22), a rotary encoder (24) for detecting the position of the car (1) in order to calculate the length of the rope, a load sensor (25) for detecting the load of the car (1) and a control panel (23) which calculates the characteristic vibration frequency f of the rope (13) from the length of the rope, the characteristic vibration frequency f.sub.N of the spring from the car (1) load, and the vibration frequency ratio u (u=f/f.sub.N), and is made so as to constrict the flow volume control valve (22) of the above-mentioned cylinder device (16) when u=1.
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patent: 4830146 (1989-05-01), Nakamura et al.
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patent: 5027925 (1991-07-01), Kahkipuro
patent: 5289902 (1994-03-01), Fujita
patent: 5641041 (1997-06-01), Masuda et al.
patent: 5750645 (1998-05-01), Fuller et al.
Iwakiri Atsushi
Miyahara Nobuyuki
Otis Elevator Company
Tran Thuy V.
Young Karen M.
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