Tool driving or impacting – Impacting devices – Spring bodily cyclically moved with hammer head
Patent
1980-06-27
1982-06-29
Reynolds, Wm. Carter
Tool driving or impacting
Impacting devices
Spring bodily cyclically moved with hammer head
B23B 4504
Patent
active
043368476
ABSTRACT:
A percussion drill comprises an open-ended, hollow cylinder having an air exhaust hole on the side wall thereof, a piston mounted in the rear end portion of the cylinder, and a slide shaft mounted in the front end portion of the cylinder. A drill bit is releasably attached to the forward end of the slide shaft for working with a material. Between the piston and the slide shaft is mounted a striker which forms a forward variable volume air chamber and a rearward variable volume air chamber. The piston is driven by a motor-crankshaft arrangement to reciprocate axially in the cylinder to cause a positive high pressure to develop in the rearward chamber, which pressure provides an impact on the striker whose mechanical energy is transferred to the slide shaft. A return movement of the piston develops a negative pressure in the rearward chamber to pull back the striker to the impact position. The striker is formed with an air passage which is open at one end to the forward chamber and at the other end to the side wall thereof for communicating the forward chamber to the atmosphere through the air exhaust hole of the cylinder. This communication is established when the workpiece is pierced to allow a negative pressure to develop in the forward chamber.
REFERENCES:
patent: 3572448 (1971-03-01), Marcenuk
patent: 3791461 (1974-02-01), Rosselet
patent: 3828863 (1974-08-01), Bleicher et al.
patent: 3835935 (1974-09-01), Sides et al.
Ito Koshichi
Watanabe Yoshihiko
Hitachi Koki Company Limited
Reynolds Wm. Carter
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