Safety arrangement for driving tools

Details Safety arrangement for driving tools Safety arrangement for driving tools

1993-12-10

1995-09-19

Seidel, Richard K.

Tool driving or impacting

Drive controlled by relative axial movement of tool

173211, 173DIG2, 227147, 279 191, B25D 904, B25D 1710, B25D 1711

Patent

active

054509114

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 a 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 result of the last impact and simultaneous sideward shifting 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.

REFERENCES:
patent: 1142238 (1915-06-01), Cook
patent: 1464570 (1923-08-01), Hage
patent: 1497476 (1924-06-01), Binnie
patent: 1642490 (1927-09-01), Decker
patent: 3559753 (1971-02-01), Meri
patent: 4470440 (1984-09-01), Thor
patent: 4585077 (1986-04-01), Bergler
patent: 4648609 (1987-03-01), Deike

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