Hammer drill

Details Hammer drill Hammer drill

B - Operations, Transporting

23

B

77/15

B23B 45/00 (2006.01) B25D 9/08 (2006.01) B25D 11/00 (2006.01) B25D 16/00 (2006.01)

Patent

CA 1136446

ABSTRACT In a rotary hammer drill in which the tool is driven in rotation by rotating the cylinder 21 housing a driver piston 30 and a striker 32, the hammering effect is rendered inoperative by providing in the well of the barrel an aperture 35 which is axially positioned so as to vent the space between the driver and striker to atmosphere. A sleeve 37 is mounted on the external surface of the barrel and is axially movable to blank off the aperture 35 or to place it in communication with the ambient atmosphere.

353521

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