| 摘要 |
592,648. Claw clutches. ABBEY, A. (Gleason Works). May 23,1945, No. 12935. [Class 80(ii)] [Also in Groups XXII and XXIII] The driving faces of facially-toothed clutches, for automatic-overload-release or for driving when only partly engaged, are helical and also curved in the radial direction. The radial curvature of the teeth 22 on one member may be convex and on the other concave, as shown, or both may be convex, the radius in each case being different to prevent tooth-contact near the radial ends. The teeth may be helical over their whole depth or only over a chamfered portion near their ends, and are of constant depth. The clutch-teeth are cut (or ground) by successive blades 36 of a circular face-mill cutter (or annular grinding-wheel), which is rotated about a symmetrical (or other) axis 37 (or 37<SP>1</SP>), Fig. 3, parallel to the axis 26 of the clutch-member 22, which latter is rotated uniformly about its own axis as the cutter is fed into and away from it. The inward feed cuts one side face 24a of one tooth, the outward cutting the opposite side face 23a of a tooth spaced symmetrically or otherwise from the first tooth, the work being indexed tooth by tooth until the same side of the cutter finishes all faces. Convex faces are produced by the inside face of the cutter, as shown, concave faces being cut by the outside face of a different cutter. Only the rounded point 49, Fig. 7, of one side of the cutter generates the finished tooth-profile so that the sides 46, 47 need not be accurately dimensioned. |
