Hand-held hammer tool

Details Hand-held hammer tool Hand-held hammer tool

1987-04-15

1988-08-30

Kazenske, E. R.

Tool driving or impacting

Impacting devices

With means for rotating tool

173117, B23B 4502

Patent

active

047669632

ABSTRACT:
A hand-held electrically powered hammer tool with a rotor-type electromotor (17) and a hammer mechanism (14) arranged in a machine housing (13). The hammer mechanism (14) includes a drive shaft (24) with an excentric crank pin (35) thereon for a piston rod (43) connected to a drive piston (40) reciprocably movable in a cylinder (42) for driving a hammer piston (41) towards a working tool (16) via an air cushion (44) between the two pistons. The drive shaft for the hammer mechanism (14) is also the rotor shaft of the electromotor (17) so that the hammer mechanism and the motor are driven by the same speed. The electromagnetically active parts (23,49) of the rotor (18) are located outside of and surround the corresponding parts (21, 22) of the electromotor stator (19) thus enabling the rotor also to be a flywheel and a fanwheel.

REFERENCES:
patent: 3056390 (1962-10-01), Nyholm
patent: 3388273 (1968-06-01), Davis
patent: 3718193 (1973-02-01), Wanner
patent: 3924691 (1976-12-01), Brannstrom et al.
patent: 3929195 (1976-12-01), Stiltz et al.
patent: 3939921 (1976-02-01), Brannstrom
patent: 4423632 (1984-01-01), Madden et al.
patent: 4462467 (1984-07-01), Weingartner
patent: 4489261 (1984-12-01), Hartwig et al.

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