Magnetic switch with readily removable electromagnetic contact unit

Claim 1

A MAGNETICALLY OPERATED SWITCH COMPRISING A BASE, SETS OF STATIONARY CONTACTS ON THE BASE, TERMINALS ON THE BASE CONNECTED TO THE STATIONARY CONTACTS, AN ELECTROMAGNETIC COIL, AN ARMATURE, A POLE PIECE IN FLUX CONDUCTING RELATION TO THE COIL AND COOPERABLE WITH THE ARMATURE FOR MOVING THE ARMATURE UPON ENERGIZATION OF THE COIL, A FIRST MEANS CONNECTING THE ARMATURE AND POLE PIECE TO THE COIL FOR MOVEMENT OF THE POLE PIECE AND ARMATURE RELATIVE TO THE COIL AXIALLY OF THE COIL AND FOR MOVEMENT RELATIVELY TOWARD AND AWAY FROM EACH OTHER, MEANS FOR DETACHABLY SECURING THE COIL IN FIXED OPERATING POSITION ON THE BASE, INTERENGAGEABLE ABUTMENT MEANS CARRIED BY THE POLE PIECE AND ON THE BASE, RESPECTIVELY, AND INTERENGAGEABLE WITH EACH OTHER CONSEQUENT UPON SECURING THE COIL IN SAID POSITION FOR SECURING THE POLE PIECE IN OPERATING POSITION RELATIVE TO THE COIL, MOVABLE CONTACT CARRIER