H - Electricity – 01 – C
Patent
H - Electricity
01
C
338/6
H01C 10/00 (2006.01) H01C 10/24 (2006.01)
Patent
CA 1104679
ABSTRACT OF THE DISCLOSURE . This invention relates to potentiometer drive mechanisms, and more particularly to drive mechanisms for use with a potentiometer which must be physically isolated from the operator. When instruments employing electrical potentiometers are operated in a volatile gaseous environment, it is very important that small explosions or electrical discharges resulting from the electrical circuitry be contained within the potenti- ometer housing to avoid severe explosions. This problem is resolved in many cases by providing a removable housing cover which is merely taken off whenever an adjustment is made. This procedure adds to the time needed to make an adjustment, however, and also exposes the electrical circuitry within the housing to outside contaminants. Another approach uses a vernier screw and spring assembly to permit adjustments to be made from the outside, but only a somewhat coarse adjustment can be achieved with this method, and the vernier is subject to overstressing at the opposite limits of potentiometer rotation. According to the present invention, a potentiometer contained within a housing is operated from the outside by means of an operating member which extends inward through an orifice in a housing wall. The operating member engages the potentiometer drive stem with the aid of an O-ring slip clutch to prevent overstressing and includes a flange which is spring-urged against the interior housing wall to inhibit internal explosions from propagating to the outside.
291805
Andrews Allen H.
Burdine Warren E.
Hendrie John M.
Rhind Terence K.
Bourns Inc.
Gowling Lafleur Henderson Llp
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