Electropneumatic hammer drill

Details Electropneumatic hammer drill Electropneumatic hammer drill

1985-12-13

1987-06-02

Schran, Donald R.

Tool driving or impacting

Impacting devices

With means for rotating tool

173116, B23B 4502

Patent

active

046695516

ABSTRACT:
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 crankshaft and the piston rod form a subassembly. The subassembly can be inserted into and removed from the hammer drill as a unit.

REFERENCES:
patent: 2240598 (1941-05-01), Wilke
patent: 2270752 (1942-01-01), Drennon
patent: 3056390 (1962-10-01), Nyholm
patent: 3828865 (1974-08-01), Schnizler, Jr.
patent: 4014392 (1977-03-01), Ross
patent: 4113035 (1978-09-01), Stiltz et al.
patent: 4529044 (1985-07-01), Klueber et al.

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