Test method and device for screwers

Details Test method and device for screwers Test method and device for screwers

1997-07-14

1999-03-23

Williams, Hezron

Measuring and testing

Instrument proving or calibrating

Dynamometer

738659, 73 112, G01N 1900

Patent

active

058862463

ABSTRACT:
A test method for a screwer performs the steps of connecting the screwer to a rotatable attachment element, screwing down the screwer, measuring the attachment element speed, power-supplying an electric motor to bring it to a speed close to the measured speed, connecting the shaft of the electric motor to the attachment element, and causing the motor to follow a braking ramp while the torque transmitted from the screwer to the driving shaft is measured. A device in accordance with this method includes a rotatable attachment element to which the screwer to be tested is applied, and an electric motor connected to the attachment element through a releasable coupling connecting the motor to the attachment element on achievement of a motor speed close to that of the attachment element. The motor is controlled for following a braking ramp based on a predetermined law, while a transducer measures the transmitted torque between the attachment element and braking element.

REFERENCES:
patent: 3754437 (1973-08-01), Kanabel et al.
patent: 3962910 (1976-06-01), Spyridakis et al.
patent: 4150559 (1979-04-01), Levy

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