Improvements in magnetic work holders

Abstract

Abstract 472,426. Magnetic work holders. NEILL & CO. (SHEFFIELD), Ltd., J., and BOWER, W. L. May 5, 1936, No. 12674. Addition to 429,199. [Class 35] [Also in Group XXIII] In a magnetic workholder of the kind claimed in the parent Specification the permanent magnet 9 and a, pair of polepieces 6 are relatively rotatable into a position in which the flux is short-circuited through the individual polepieces, passing through them in a direction at right-angles to its previous course. The main polepieces 6 project from the lower end of an aluminium casing 5 having a cover plate 7 from which is rotatably supported a substantially cylindrical magnet assembly comprising the permanent magnet 9 and two polepieces 10. In the " on " position the polepieces 10 rest on the polepieces 6 through which the flux passes longitudinally to the work. When the magnet is rotated through 90‹ by the lever 13, each of the polepieces 10 forms a leakage path for the flux which passes transversely through their upper ends while arcuate mild steel plates 8 secured within the casing act as screens to cut down stray flux. The underside of the lever 13 is formed as a cam which co-operates with two pins 14 projecting from the cover plate 7 to raise the magnet assembly away from the polepieces 6 as it is turned to the off position. The magnet may be rotated slightly beyond the " off " position so as to allow a small amount of flux to pass through the work in the reverse direction and so destroy any residual magnetism in the work piece.

Inventors

No inventors recorded.

Bibliographic Details