Pneumatic timing attachment for an electromagnetic device

Abstract

A timing attachment for a relay which may be programmed to provide an ON DELAY or an OFF DELAY operation of a pair of switches with each switch having either normally open or normally closed contacts. The attachments includes a bellcrank having a lever arm actuated by the relay. The bellcrank has a ball and socket type connection in either of two sockets in a slider to program the attachment to operate in the time delay after energization mode or a time delay after deenergization mode when a housing enclosing the slider is mounted in either of two positions on a support for the bellcrank. The attachment includes a pair of switch cartridges which are insertable in either of two positions in sockets selectively to provide a normally open or normally a closed contact operation when the relay is energized and deenergized. The switches have plungers which are positively moved from either of two positions by an operator that is moved through an energy storing lost motion connection by the slider when the operator is released by a time delay latch mechanism. The attachment also includes a means for visually indicating the programmed state of the timer when the housing enclosing the slider is mounted in its selected position on the support for the bellcrank.