| 摘要 |
<p>An improved calibration mechanism is provided for use on a pressure switch having an adjustable, spring biased plunger arrangement for controlling the pressure level required to actuate the switch. The mechanism includes a support bracket, a cam rotatably supported by the bracket and a plunger adjustment lever, including a cam follower in engagement with a surface of the cam. The support bracket defines a guide slot into which the cam follower extends, transverse movement of the cam follower being limited by the guide slot. The cam surface defines a range of pressure settings between the normal low and the normal high as well as a switch reset position adjacent the normal high setting position. The guide slot includes a stop surface which engages the cam follower when the cam is turned to the reset position, and the configuration of the cam, plus the engagement of the follower and the stop surface, prevents further turning of the cam. This arrangement provides a positive stop for the cam rotation and makes it possible to eliminate corners on the cam which might interfere with the wiring.</p> |
