| 摘要 |
1,108,248. Chucks. BALAS COLLET CO. 10 April, 1967 [26 May, 1966], No. 16293/67. Heading B3B. A tool holder comprises a shank S having an open-ended tubular portion 2 at one end, a circumferential groove in the inner wall of the portion having a base 6<1> and an inclined conical cam face 6<11>, the shank having a ball feeding hole extending radially into said groove in alignment with the base, a tubular tool receiving bushing B having a sliding fit in the tubular portion and having a plurality of balls in circumferentially-spaced retaining apertures extending radially through its wall, the apertures being of smaller diameter at their inner ends than at their outer ends, and the balls being circumferentially movable in the groove when the apertures are aligned therewith, the inclined cam face being adapted to move the balls into gripping engagement with a tool when the bushing is moved axially outwardly of the shank, spring means 10 for urging the bushing outwardly, and means 13 in the ball feeding hole for blocking the balls against movement radially out of the apertures. A tap 5 has a square end engaging a socket 4. It is released by moving the bushing B against the spring 10 to allow the balls 8 to move down the cam face 6<11>. In assembling the holder, the balls 8 are fed through the hole 12 which is then closed by the ball 13, held by the collar 14, or by a plug. |
