Hand-held tool with vibration dampening

Details Hand-held tool with vibration dampening Hand-held tool with vibration dampening

1986-06-13

1987-12-08

Bell, Paul A.

Tool driving or impacting

Including means to vibrationally isolate a drive means from...

1731621, 16110R, E21B 300

Patent

active

047113081

ABSTRACT:
A hand-held tool, such as a hammer drill or chipping hammer, includes a housing with a driving unit for supplying the driving force for the tool with the driving unit generating vibrations. A handle is mounted on the housing and is displaceable in the direction of the main vibration axis. A stop for the forward movement of the handle is provided by an electromagnet. The electromagnet is formed by a yoke, an armature and a magnetic coil and exerts a controlled constant force on the handle and the housing independently of the position of the handle relative to the housing. The electromagnet can be controlled depending on the position of use of the hand-held tool.

REFERENCES:
patent: 3824417 (1974-07-01), Moores, Jr.
patent: 4282938 (1981-08-01), Minamidate
patent: 4401167 (1983-08-01), Sekizawa et al.
patent: 4478293 (1984-10-01), Weilenmann et al.

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