| 摘要 |
1,089,658. Percussive tools. GARDNERDENVER CO. March 15, 1966 [April 15, 1965], No. 11326/66. Heading B4C. A chuck retaining means for a percussive tool comprises a spring ring 38 adapted to cooperate with grooves 42, 44 formed in a casing 10 and a chuck 34 respectively. The ring 38 is sprung into the groove 42 and a tapered surface 46 formed on the chuck 34 is urged by a pressurized fluid, such as compressed air, into Contact with the ring; the air is fed via passages 32 into a chamber 30 so as to act on a bushing 22 which, in turn; abuts the chuck; In order to remove the chuck it is moved upwardly to align the groove 44 with the ring and by compressing ends 40 on the latter causes the ring to move out of the groove 42 into the groove 44 so that the chuck can be withdrawn. A tool bit 20 is retained in the chuck by means of a spring- loaded latch 52. An anvil 18 is cushioned on its return stroke by striking the piston 22 which acts as a dash-pot. |
