Electric motor-actuated load clamp with clamping force control

Details Electric motor-actuated load clamp with clamping force control Electric motor-actuated load clamp with clamping force control

1986-05-02

1988-02-23

McCall, James T.

Material or article handling

Elevator or hoist and loading or unloading means therefor

Grab

294907, 414730, B25J 1502

Patent

active

047267291

ABSTRACT:
An electric motor-actuated load clamp for automatically-guided vehicles has clamp arms which are selectively opened and closed by a plurality of rotary electric motors connected to the clamp arms by ball screws. Clamping force is accurately controlled by regulation of current to the electric motors, any of a number of different predetermined clamping forces being selectively obtainable. During clamping of a load, the electric motors are energized only a small fraction of the time according to a time-sequenced clamping and reclamping procedure, clamping force being otherwise maintained by a one-way brake. Further control features ensure against inaccuracy and overclamping due to current in-rush, and against malfunctions which could cause safety hazards.

REFERENCES:
patent: 2959445 (1959-08-01), Breslav
patent: 3815761 (1974-06-01), Adam
patent: 3824440 (1974-07-01), McIntosh
patent: 4600357 (1986-07-01), Coules
patent: 4621331 (1986-11-01), Iwata

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