Pressure limiting switch for an instrument air circuit
AssigneeBeta Corporation
InventorPieter Engelander
Life of this patent
Estimating the term…
Abstract
A pressure limiting switch is provided for limiting the upper and lower limit values of the air pressure in a circuit feeding pneumatic controls. The switch has a switching arm which is pivotable at one end around a fixed axis in the switch body and adapted to actuate with its other end a microswitch closing a valve in the circuit if necessary. The air pressure is sensed by a movable element which engages the switching arm between the pivot axis and the microswitch. The switching arm is spring biased for compensating the microswitch spring. The air pressure range is adjustable through adjusting discs serving as abutments for movement of the switching arm.
Claims7
Fluid pressure limiting switching means including a microswitch and comprising a switching arm, means pivotally mounting one end of said switching arm for movement about a fixed point with the opposite end of said arm being in position to actuate the microswitch, an actuating rod axially moveable under the influence of fluid pressure to be monitored for moving said switching arm about said fixed pivot point, an opening in the arm through which said rod extends, said rod being moveable with respect to the arm, said opening providing clearance between the rod and the arm so that the rod and arm do not contact each other throughout all positions of the rod, a pair of abutments located on said rod on opposite sides of said arm, said abutments being adjustable axially of the rod and being movable with the rod into positions of contact with the arm for pivotal movement of the arm toward and away from microswitch actuating position.
Dependencies are inferred from the claim text.