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    • 4. 发明专利
    • Improvements in vices
    • GB668571A
    • 1952-03-19
    • GB2240349
    • 1949-08-29
    • GEORGE BLAIR AND COMPANY LTDIAN LEWIS BLAIR
    • B25B1/12
    • 668,571. Vices. BLAIR & CO., Ltd., G., and BLAIR, 1. L. Aug. 28, 1950 [Aug. 29, 1949], No. 22403/49. Class 61 (ii). In a quick adjustment vice operated by rotating a screw coacting with a segmental nut, the nut is rockable about a transverse edge on the vice body into and out of engagement with the screw and has movement which is limited by surfaces on the nut engaging with surfaces on the vice body. The nut d is provided with projecting lugs d' and d', the undersurface of the lug d' bearing on the crosspiece e of the body and the upper surface of the lug d 2 engaging with the cross-piece f when the nut and screw a are in engagement. The nut d fulcrums about the edge of the cross-piece e and is swung into and out of engagement with the screw by a flat bar g carried eccentrically by an L-shaped handle h rotatable in a bearing j on the arm b. The bar g is supported between a ledge m 1 on a lug m attached to the nut d and a recess k 1 on the stalk k on the cross-piece f. A stop o, Fig. 2, prevents transverse movement of the nut to the right. The Provisional Specification describes a guard surface in the ram b to prevent bending of the screw.