Pneumatic timing attachment for an electromagnetic device

A timer attachment for an electromagnetically operated device wherein the device includes:

• a housing having a front end, a member movable along an axis perpendicular to the front end and an electromagnet coupled to the member for moving the member along the axis from a deenergized position to an energized position in response to the deenergization and energization of the electromagnet, said timer attachment comprising:
• an adapter assembly including an adapter part secured at the front end of the housing and an actuator secured to a front end of the member and movable along the axis by the member, said actuator having an end spaced forwardly of a front side of the adapter part,
• a base assembly having a base part mounted on a front side of the adapter part, said base assembly including:
• a bellcrank having a pivot mounted on a front side of the base part, said bellcrank having a first arm extending from the pivot to an end that is engagable with the end of the actuator for rotating the bellcrank in a first direction when the electromagnet is energized and a second arm extending from the pivot at an angle to the first arm, a spring reacting on the bellcrank and urging the bellcrank toward rotation in a second direction that is opposite the first direction, a spring biased lever having a portion engagable with the bellcrank for supplying an additional force for rotating the bellcrank in the second direction, and
• a timer assembly including a housing part that is mountable in either of two selected positions on the base part, said timer assembly including:
• a slider having a first portion coupled with an end on the second arm when the housing is mounted on the base in one of the two positions and a second portion that is coupled with the end of the second arm when the housing is mounted on the base in the other of the two positions and movable along an axis in response to rotation of the bellcrank when the housing is mounted on either of the two positions,
• an operator mounted in the housing for reciprical movement along the axis,
• a guide and a spring providing a lost motion connection between the slider and the operator for translating movement between the slider and operator, and
• a timing mechanism having a member movable from a first position to a second position during a timed interval,
• a latch mechanism including a pair of latch levers each having a central portion rotatable about a pivot with a first of the latch levers having an arm extending from its associated pivot to an end that is coupled to the operator and the second of the latch levers having an arm extending from its associated pivot to an end that is spaced from the timing member when the timing member is at the first position and is engaged by the timing member when the timing member is at the second position, said latch levers each having a second arm extending from its associated pivot to ends that are positioned to mutually engage each other when the timing member is at its first position, and a spring positioned between the arms of the levers urging the levers in the same rotary direction.