Hammer
AssigneeBlack & Decker Inc.
InventorsAndreas Hanke, Reinhard Plietsch, Stefan D. Gensmann, Heinz-Werner Faatz, Reimund Becht
Life of this patent
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Abstract
A hand held electrically powered hammer comprises a housing, a motor, and a hollow spindle. A piston and a ram are located for reciprocation within the spindle. A casing encloses at least part of the spindle so as to define a chamber between the spindle and the casing. A damping mass is slideably supported by a spacer and is located within the chamber and is connected to the hammer housing via a spring so as to oscillate back and forth along the spindle to minimize the vibration of the hammer housing and also so as to generate air flows within the chamber for facilitating heat transfer from the spindle to the metal casing.
Claims19
A hand held electrically powered hammer, comprising a housing within which is located:
- a motor;
- a hollow spindle within which is located for reciprocation therein a piston and a ram;
- a hammer drive arrangement which converts the rotary drive of the motor to a reciprocating drive to the piston;
- a tool holder body in which a tool may be mounted for reciprocation;
- wherein the reciprocation of the piston reciprocatingly drives the ram via an air cushion such that repeated impacts from the ram are transmitted to a tool mounted in the tool holder body, and wherein the hammer additionally comprises:
- a casing which encloses at least part of the spindle so as to define a chamber between the spindle and the casing;
- a damping mass which is located within the chamber which damping mass is connected to the hammer housing via a spring element so as to oscillate back and forth along the spindle;
- and
- at least one spacer element slideably mounted on the spindle for positioning the damping mass between the spindle and the casing so that a first gap is present between the damping mass and the spindle and a second gap is present between the damping mass and the casing.
A hand held electrically powered hammer, comprising:
- a housing;
- a motor;
- a hollow spindle
- a piston and a ram located within the spindle for reciprocation therein;
- a hammer drive arrangement which reciprocatingly drives the piston;
- a tool holder body in which a tool may be mounted for reciprocation;
- a casing which encloses at least part of the spindle so as to define a chamber between the spindle and the casing;
- a damping mass which is located within the chamber which damping mass is connected to a spring element so as to oscillate back and forth along the spindle;
- and
- at least one spacer element slideably mounted on the spindle for positioning the damping mass between the spindle and the casing so that a gap is present between the damping mass and one of the spindle and the casing.
Dependencies are inferred from the claim text.