B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
B25D 17/00 (2006.01) B25C 7/00 (2006.01) B25D 17/10 (2006.01) B25D 17/24 (2006.01) E01B 29/26 (2006.01)
Patent
CA 2072062
ABSTRACT A railroad spike driving tool (30) is adapted to be inserted by its shank (22') for cooperation into hand-held hammer machines of the type comprising a machine housing (10) with a cylinder (11), in which a reciprocating drive piston (14) via gas cushion in a working chamber (12) repeatedly drives a hammer piston (15) to impact on the shank (22') during spike driving. Forward sudden displacement of the shank (22') causes the hammer piston (15) to perform a forward blow in the void and come to rest. If the tool (30), as a re- sult of the last impact and simultaneous sideward shif- ting of the machine, happens to hit against the rail, a safety spring (36), pre-stressed between a rearwardly facing shoulder (34) on the tool (30) and the machine housing (10), prevents the tool (30) from bouncing back into the machine and thus from being hit by said hammer blow in the void or from releasing a new blow. Possible injury to the operator is thereby avoided.
Atlas Copco Berema Aktiebolag
Fetherstonhaugh & Co.
LandOfFree
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