Hammer drill with rotational lock

Details Hammer drill with rotational lock Hammer drill with rotational lock

1986-10-20

1988-08-16

Kazenske, E. R.

Tool driving or impacting

Drive adjustable to completely change kind of drive

Adjustable to impacting device

173109, B25D 1104

Patent

active

047637331

ABSTRACT:
A hammer drill can be switched between combined rotary and impact operation and impact operation. An electropneumatic mechanism provides the impact force and includes a guide cylinder with a beveled gear wheel extending around the outside surface of the cylinder. The gear wheel is driven by a drive wheel. A coupling sleeve is mounted on the guide cylinder for rotation with it and is axially displaceable relative to the cylinder between a first position in meshed engagement with the gear wheel and a second position displaced out of meshed engagement. A switching device moves the coupling sleeve between the two positions. In the first position, the coupling sleeve rotates the guide cylinder, while in the second position the guide cylinder is locked against rotation. The switching device includes a control cam engaged within a groove extending in the circumferential direction of the outside surface of the guide cylinder. In the second position of the coupling sleeve, the control cam is moved inwardly relative to the cylinder into one of a plurality of detent openings formed in the base of the groove for locking the guide cylinder so that it does not perform any rotary movement.

REFERENCES:
patent: 3774699 (1973-11-01), Schmuck
patent: 3834468 (1974-09-01), Hettich et al.
patent: 3837409 (1974-09-01), Consoli et al.
patent: 3845826 (1974-11-01), Beisch
patent: 4236588 (1980-12-01), Moldan et al.

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