Clamp force control for load-handling device

Details Clamp force control for load-handling device Clamp force control for load-handling device

1997-04-22

2000-02-22

Bucci, David A.

Material or article handling

Elevator or hoist and loading or unloading means therefor

Grab

294 88, 294907, 414636, 414911, B66C 142, B66F 906

Patent

active

06027302&

ABSTRACT:
A control is provided for a load-handling device that includes a hydraulic gripper (14) which is intended to grip objects, such as one or more rolls or bales of paper material or other goods, through the medium of pressure in a clamping pressure line (32) leading to one or more hydraulic cylinders (30) that actuate gripping arms on the gripper (14), and on the other hand to lift the objects by actuation from a lifting device (22, 42). The clamping force is adapted to the lifting force during a clamping and lifting operation, by, among other things, monitoring the lifting force of the lifting device (42) with the aid of sensor member. A pressure reduction valve (36) is provided in the clamping pressure line (32), and a control member (50) is provided for controlling the pressure reduction valve (36) to a pressure in the clamping pressure line (36) that is proportional in the lifting force detected by the sensor member (60).

REFERENCES:
patent: 4161256 (1979-07-01), Seaberg
patent: 4215622 (1980-08-01), Chichester
patent: 4467894 (1984-08-01), Sinclair
patent: 4491918 (1985-01-01), Yuki et al.
patent: 4714399 (1987-12-01), Olson
patent: 4730862 (1988-03-01), Caen et al.
patent: 4783106 (1988-11-01), Nutter
patent: 5292219 (1994-03-01), Merin et al.
patent: 5370435 (1994-12-01), Monk et al.
patent: 5417464 (1995-05-01), Seaberg et al.

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