Electropneumatic hammer drill

Details Electropneumatic hammer drill Electropneumatic hammer drill

B - Operations, Transporting

23

B

121/7

B23B 39/10 (2006.01) B25D 16/00 (2006.01)

Patent

CA 1227385

ABSTRACT OF THE DISCLOSURE An electropneumatic hammer drill includes a housing containing a guide cylinder in which an exciter piston and a percussion piston are displaceably mounted in spaced relation with an air cushion formed between them. A hollow shaft encircles the guide cylinder within the housing and transmits rotary motion to a tool mounted in the hammer drill. A crankshaft for reciprocating the exciter piston via a piston rod is supported in two bearings located in the guide cylinder. The percussion mechanism for the hammer drill made up of the guide cylinder, the exciter piston, the percussion piston, the crank- shaft and the piston rod form a subassembly. The subassembly can be inserted into and removed from the hammer drill as a unit.

448087

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