Percussive tool having a reduced impact at the start of percussi

Details Percussive tool having a reduced impact at the start of percussi Percussive tool having a reduced impact at the start of percussi

1997-03-27

1999-02-23

Smith, Scott A.

Tool driving or impacting

Impacting devices

With impact cushioning means

173109, 173201, 173 48, B25D 1104

Patent

active

058734180

ABSTRACT:
A percussive tool generates a reduced impact at the start of percussive operation following idling operation. The percussive tool has a cylinder containing a piston, an air chamber in front of the piston, and a striker disposed in front of the air chamber. A slide sleeve and a rimmed ring at the rear end thereof are fitted around the cylinder. The cylinder has formed therein an exhaust port and auxiliary ports in front of the exhaust port for placing the air chamber in communication with the atmosphere. When the slide sleeve is retracted, the exhaust port is closed by the rimmed ring. During percussive operation of the percussive tool, the auxiliary ports are always closed by the reciprocating striker and therefore not open to the air chamber. During idling operation, the striker takes an advanced position and opens the auxiliary ports, thereby placing the air chamber in communication with the atmosphere. The distance between the rear end of the striker and the auxiliary ports is set slightly shorter than the distance between the rear end of the ring and the exhaust port in normal operation, so that the auxiliary ports are opened prior to the exhaust port.

REFERENCES:
patent: 4567951 (1986-02-01), Fehrle et al.
patent: 4582144 (1986-04-01), Mizutani et al.
patent: 4611670 (1986-09-01), Chromy
patent: 4719976 (1988-01-01), Bleicher et al.
patent: 4823886 (1989-04-01), Dyatov
patent: 4825961 (1989-05-01), Neumaier et al.
patent: 5111890 (1992-05-01), Ranger et al.

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