Calibration and adjustment arrangement for deceleration switch

Details Calibration and adjustment arrangement for deceleration switch Calibration and adjustment arrangement for deceleration switch

H - Electricity

01

H

340/148.63

H01H 35/14 (2006.01) G01P 15/135 (2006.01) G01P 21/00 (2006.01) H01H 29/00 (2006.01)

Patent

CA 1042492

CALIBRATION AND ADJUSTMENT ARRANGEMENT FOR DECELERATION SWITCH ABSTRACT OF THE DISCLOSURE A decelerometer of the type comprising a tiltable mercury tube deceleration switch carried on a first plate that is piv- otally mounted on a second plate which may be secured to a moving object, such as a railway vehicle. A screw mechanism intermediate the first and second plates is arranged to effect adjustment of the degree of tilt of the first plate relative to the second plate in order to accommodate factory calibration of the degree of deceleration which the deceleration switch is in- tended to sense. The screw mechanism is further arranged to provide upper and lower mechanical stops to limit the range of deceleration adjustment and thereby prevent unauthorized field adjustment of the deceleration sensitivity beyond a safe level, when subsequently installed on a railway vehlcle. A reference marking placed on the mercury tube in alignment with the level of mercury therein, when the deceleration switch is factory calibrated at the desired deceleration level serves as a means of properly positioning the decelerometer when installed on the railway vehicle so as to accurately retain the factory cali- brated deceleration setting, since the lower limit of the de- celeration adjustment locks out the mercury contact closure of the deceleration switch as a means of obtaining a static zero mph/sec. reference.

249190

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