| 摘要 |
1,109,560. Percussive tools. INGERSOLL-RAND CO. 14 Feb., 1967 [11 March, 1966], No. 6936/67. Heading B4C. A needle-type descaling tool comprises a reciprocating impact member 7 mounted in a body 4 and adapted to strike a plurality of tool bits 21 mounted in a holder 17. The holder is urged by a spring 20 against a cap 6 at the forward end of a sleeve 5 releasably secured to the body; the spring serves to return the member 7 after it has been struck by a reciprocable impact piston 2. |
