Permanent magnetic flux circuit and an actuating member with adjusting means

Claim 1

In an electromagnetic igniter, a combination comprising, a permanent magnetic flux circuit including a permanent magnet, an L-shaped soft iron core and an armature; said magnet and said core forming a U-shaped magnetic structure with two poles-having upper surfaces arranged in a plane; the upper pole surface of the magnet forming with an adjacent outer side surface of said magnet an agle of substantially 90* thus definning a tilting edge; the armature extending throughout the entire width of thE Ushaped structure and covering the upper pole surfaces with corresponding surface portions which form a part of the inner surface of the armature; said armature being mounted tiltably about said edge between a magnetic flux closing position in which it bridges said upper pole surfaces and, respectively, a magnetic flux opening position in which it is inclined relative to said plane; a resilient, energy storing, operating member being attached to the end surface of said armature in the region of tilting; said operating member having a lever portion forming with armature an apex abutting against said edge; said lever portion and said inner armature surface forming an operating angle ranging from about 95* to about 115* in the magnetic flux closing position of the armature, whereby upon actuation of said lever portion overcoming the magnetic attraction force exerted against the armature by the U-shaped magnetic structure in the flux closing position, the armature will be tilted about said edge from the flux closing position toward the flux opening position; and adjusting means including a threaded screw operable to preset adjustably the angular position of said operating member with respect to said permanent magnet, thereby pre-setting the angular stroke of said armature.