Hammer for removing gates or risers from castings

Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure

Patent

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Details

173114, 173115, 173202, B25B 2800, B25D 900

Patent

active

054070171

ABSTRACT:
An air-operated hammer is provided for removing risers or gates from castings. The hammer includes a piston having a rod to which an impact member is releasably latched. Operation of the piston is controlled by a pneumatic logic control circuit, the operation of which is initiated by simultaneously depressing a pair of thumb-operated pneumatic switches. When actuated, the control circuit acts to cause the piston to retract to cause the impact member to compress one or more blow-delivery springs, with the latch being automatically released, upon desired loading being achieved, to permit the release of the stored energy in the springs resulting in the impact member being impelled against a gate or riser to be broken off. Meanwhile, the circuit operates to reverse the direction of movement of the piston so that it extends to be automatically once again latched to the impact member. The circuit then operates to cause the piston to once again reverse its direction with the cycle of operation being completed once the impact member meets the resistance of the blow-delivery springs.

REFERENCES:
patent: 3177952 (1965-04-01), West
patent: 3181626 (1965-05-01), Sussman
patent: 3268013 (1966-08-01), Sussman
Literature from Hitachi of Japan, four pages, date unknown, but before date of present invention.
Publication from Maschinenfabrik of Fernruf, Germany, five pages, date unknown, but before date of present invention.

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