Method of detecting failure to tighten screws against works and

Details Method of detecting failure to tighten screws against works and Method of detecting failure to tighten screws against works and

1990-04-04

1991-03-26

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340568, 340626, 340664, 340674, G08B 2100

Patent

active

050032976

ABSTRACT:
A method of detecting failure to tighten screws against works includes steps of detecting every screw tightening operation against a work after start of a screw tightening step, counting the number of times of the screw tightening operations detected in the previous step, detecting the completion of the screw tightening step, and comparing a counted value at the time of the completion of the screw tightening step with a predetermined value, thereby informing of a result of comparison. A device for carrying out this method includes a current relay responsive to a large load current during the tightening operation of an electric screwdriver in a screw tightening step, a presettable counter for counting the number of operations of the current relay for the purpose of counting the number of screw tightening operations, setting knobs operated for setting a desirable number of screws to be tightened, photoelectric switches for detecting completion of the screw tightening step for the work, and an alarming device for comparing a counter value obtained by the presettable counter and the value set by the knobs when a screw tightening work completion signal is generated by any one of the photoelectric switches. The alarming device includes a buzzer energized when counted value does not reach the preset value set at the presettable counter.

REFERENCES:
patent: 4134486 (1979-01-01), Grone
patent: 4294110 (1981-10-01), Whitehouse
patent: 4317112 (1982-02-01), Beier et al.
patent: 4571696 (1986-02-01), Bitzer
patent: 4603329 (1986-07-01), Bangerter et al.
patent: 4831364 (1989-05-01), Shinohara et al.

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