| 摘要 |
936,722. Chucks. K. KAWASAKI. Nov. 17, 1959 [Nov. 26, 1958], No. 38953/59. Class 83 (3). In a drill-chuck the jaws 10 are moved to grip the drill 6 by rotating a nut 13, engaging threads on the jaws, and a further gripping- pressure is produced by moving the nut and the jaws axially by a further nut 18 and a toggle such as 23, 24. The chuck, Fig. 1, comprises a body 1 having a tapered-bore 5 for connecting to the drilling-machine, grooves 9 in which the jaws 10 slide, and recesses 22, in each of which a lever 23 is located. Each lever 23 has a recess 26 carrying a further lever 24, the latter abutting the nut 13 co-operating with threads on the jaws 10. The nut 13 is secured to a sleeve 15 by screws 16, and the levers are actuated by the nut 18 screwing on the body 1. In operation, the sleeve 15 and the nut 13 are rotated, thus moving the jaws axially to grip the drill 6. The nut 18 is then rotated and the levers 23, 24 move the nut 13 and the jaws 10, a further distance axially, thus increasing the gripping-force on the drill. In a modification, each toggle 23, 24 is replaced by a single lever 23, Fig. 3, and the nut 13 is moved axially to produce the increased gripping force, by screwing the nut 18 on the body 1, a conical surface 21<SP>1</SP> pivoting the lever about a point 23a, and engaging the nut 13. |
