Electropneumatic hammer drill or chipping hammer
AssigneeHilti Aktiengesellschaft
InventorsWilhelm Klueber, Peter Bloeckinger, Werner Theissig
Life of this patent
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Abstract
In an electropneumatic drill or chipping hammer with an air cushion transmitting driving force of an exciter piston to a percussion piston, a clutch is provided to interengage a drive motor with the exciter piston. The clutch can be selectively engaged by an axially displacing holding sleeve which positions a tool on the front end of the drill or hammer.
Claims7
Electropneumatic hammer drill or chipping hammer comprising a housing having a front end, a rear end and an axis extending in the front end-rear end direction, a percussion piston located within said housing and displaceable in the axial direction of said housing, an exciter piston located within said housing displaceable in the axial direction of said housing and aligned with said percussion piston with said exciter piston located closer to the rear end of said housing than said percussion piston and spaced from said percussion piston, an air cushion formed between said exciter piston and said percussion piston, a drive motor located within said housing, means mounted in the front end of said housing for holding a tool to be operated by said drive motor, means for interconnecting said drive motor and said exciter piston for reciprocating said exciter piston, said means for interconnecting including a clutch, and said means for holding a tool including a sleeve supported in the front end of said housing and said sleeve being axially displaceable within said housing and engageable with said clutch for selectively engaging said clutch.
Dependencies are inferred from the claim text.