Rotary hammer with improved pneumatic drive system

Details Rotary hammer with improved pneumatic drive system Rotary hammer with improved pneumatic drive system

1997-06-18

1999-09-21

Gerrity, Stephen F.

Tool driving or impacting

Drive adjustable to completely change kind of drive

Adjustable to impacting device

173109, 173114, 173201, B25D 904

Patent

active

059541407

ABSTRACT:
A rotary hammer operable in an idle mode and a hammer mode. The rotary hammer includes a housing, a barrel positioned in the housing and including a side wall having a port, a ram positioned within the barrel and axially movable relative to the barrel, and a seal supported on the mid-portion of the ram and forming a seal between the side wall and the ram. The seal has a range of motion relative to the barrel, and the port is located in the side wall such that the port is beyond the range of motion of the seal. The hammer further includes a tool supported by the hammer, and engagement of the tool with a workpiece moves the barrel relative to the housing and changes the hammer from the idle mode to the hammer mode. The hammer further includes a biasing member, such as a spring, biasing the hammer toward the idle mode.

REFERENCES:
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patent: 2638749 (1953-05-01), Sparano
patent: 4290492 (1981-09-01), Sides et al.
patent: 4325436 (1982-04-01), Richter et al.
patent: 4567951 (1986-02-01), Fehrle et al.
patent: 5111890 (1992-05-01), Ranger et al.
patent: 5379848 (1995-01-01), Rauser
patent: 5435397 (1995-07-01), Demuth
patent: 5456324 (1995-10-01), Takagi et al.

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