Rotary hammer with a pneumatic hammer mechanism

Details Rotary hammer with a pneumatic hammer mechanism Rotary hammer with a pneumatic hammer mechanism

1993-11-22

1995-07-25

Smith, Scott A.

Tool driving or impacting

Impacting devices

With means for rotating tool

173201, 173 48, B25D 1104

Patent

active

054353971

ABSTRACT:
A rotary hammer with a pneumatic hammer mechanism has a reciprocatable piston driven in a guide tube, which piston, through alternating development of overpressure and underpressure at its rear side, moves a ram forward to create an impact on the rear end of the bit and back again, the front side of the ram being connected to the surrounding air via at least one vent opening. The at least one vent opening is at least partially closeable to create a pressure countering the forward movement of the ram.

REFERENCES:
patent: 3835935 (1974-09-01), Sides et al.
patent: 4280359 (1981-07-01), Schmid et al.
patent: 4349074 (1982-09-01), Ince
patent: 4442906 (1984-04-01), Simpson
patent: 4567951 (1986-02-01), Fehrle et al.
patent: 4611670 (1986-09-01), Chromy
patent: 4719976 (1988-01-01), Bleicher et al.
patent: 4750567 (1988-06-01), Grossmann et al.
patent: 5111890 (1992-05-01), Ranger et al.

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