| 摘要 |
1,201,574. Positive clutches. ERIKSBERGS MEK VERKSTADS AB. 19 Nov., 1968 [24 Nov., 1967; 13 Dec., 1967], No. 54836/68. Heading F2C. A tool 1, Fig. 1, is held in a chuck 3 by balls 7 which are forced into grooves 5 in the tool by springs 13 and an annulus 10. When the torque on the tool rises above a predetermined limit the springs are compressed and the balls are forced out of the grooves 5. The pressure of the springs 13 is adjusted by a nut 12. To remove the tool 1, the annulus 9 is rotated against a spring 21 by means of a sleeve 22 and raised to permit the balls 7 to move outwards. Figs. 7-11 (not shown), illustrate ways in which the upper end of the tool may be grooved or tapered or both to effect automatic ejection or permanent disengagement on overload. Figs. 13,14 show an embodiment in which the tool is inserted or removed by rotating an annulus 9 and sleeve 45 against springs 42 until recesses 40 are opposite the balls 7 whereupon the balls move outwards into the recesses. |
