Patent ID: 7000481
Filing Date: 2006-02-21
Classification: H01H

Abstract:
1. A system for air pressure electric switch adjustment, comprising: a frame; a pressure port mounted to the frame for connection to a source of fluid under pressure to be monitored; an actuator moveably mounted relative to the frame responsive to fluid pressure at the pressure port; a switch including a fixed contact and a moveable contact, the fixed contact being fixedly mounted relative to the frame; a differential mechanism comprising a pair of linked levers hingedly mounted to the frame, one of the linked levers being driven by the actuator, the other lever carrying the moveable contact, and a snap spring linking the two levers so that the other lever is normally in a first position with the switch in a normal state, and responsive to pivotal movement of the one lever, the other lever is toggled by the snap spring to a second position with the switch in an actuated state; and a switch adjustment mechanism operatively mounted to the frame for varying the first position of the other lever relative to the one lever to vary actuation pressure.