MULTI-POLAR LIMIT SWITCH WITH BUILT-IN REED SWITCH

PURPOSE: To provide a multi-polar limit switch whose reed switch contacts are put in sequential operation by driving a plurality of reed switches with a combteeth magnet of single piece structure equipped with a plurality of openings. CONSTITUTION: A reed switch 1a for a-contact and reed switch 1b for b-contact are installed in each groove center of a combteeth magnet 2, and the location of the magnetism center of the reed switch 1b is restricted inside the magnet, and a stationary contact and a movable contact are inverted from the one for b-contact so that the location of the magnetism center of the reed switch 1a is restricted outside the magnet. When a driving rod 3 is pushed in, the magnet 2 coupled with the rod 3 moves on the periphery of the reed switch 1, so that the contact of the reed switch 1b is turned from the closing motion to the opening with progress of the push-in stroke. On the other hand, the contact of the reed switch 1a is turned from the opening motion to the closing, and the on motions of the a-contact and b-contact are in sequential operation without overlapping.