Limit switch

• US 4,960,966 A
• Filed: 11/06/1989
• Issued: 10/02/1990
• Est. Priority Date: 11/06/1989
• Status: Expired due to Fees

• Current Assignee: Enterprise Value Limited
• Original Assignee: Enterprise Value Limited
• Inventors: Evans, William B., Evans, Charles F. III
• Primary Examiner(s): SCOTT, JAMES R
• Application Number:
  US07/431,928
• Time in Patent Office: 330 Days
• Field of Search: 200/47, 200/61.41, 200/61.42, 200/293
• US Class Current: 200/61.41
• CPC Class Codes: H01H 13/18 adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift

Abstract

Switch device including an enclosure having a pivot or shaft arm extending across the enclosure with a distal arm attached thereto for selective contact to move the shaft to indicate the presence of an object. The pivotal shaft carries a actuator device for rotational movement with movement of the distal arm, a stop device connected from the inside surface of the enclosure extending toward the actuator device to engage the actuator device and limit the movement of the actuator device in a first direction, a sensor device normally located in proximity to the actuator device when the actuator device engages the stop device, a generally oval elastomeric spring device attached to the inner surface of the enclosure and adapted to normally to engage the side of the actuator device opposite the sensor device to bias the actuator device to engagement with the stop device and to allow the movement of the actuator device away from the stop device and the sensor device upon engagement of an object with the distal arm.

Claims

1. A switch device including an enclosure having a pivot arm extending across the enclosure with an external distal arm attached thereto to indicate the presence of an object, the pivot arm carries, an actuator device for rotational movement corresponding to the movement of the distal arm, a stop device connected to an inside surface of the enclosure extending toward the actuator device to engage the actuator device and limit the movement of the actuator device in a first direction, a sensor located in proximity to the actuator device when the actuator device engages the stop device, a generally circular elastomeric spring device attached to another inside surface of the enclosure and adapted to spring outwardly to normally engage the side of the actuator device opposite the sensor device to bias the actuator device to engagement with the stop device and to allow the movement of the actuator device away from the stop device and the sensor upon engagement of an object with the distal arm.