US 5,873,579 AGranted

Protective device for a fluid-operated percussion tool

AssigneeKrupp Bautechnik GmbH

InventorsHeinz-Jurgen Prokop, Karlheinz Fritz, Thomas Deimel, Martin Schareina, Thorsten Ahr

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Abstract

A percussion tool includes a housing part having a frontal end provided with an opening; a tool bit guide supported in alignment with the opening; and a tool bit slidably supported in the tool bit guide and projecting from the housing part through the opening. The tool bit is arranged for a reciprocating motion parallel to the longitudinal tool bit axis and transverse excursions substantially perpendicular to the tool bit axis. A transverse guide is attached to the housing part and displaceably receives an outer seal composed of a transverse slide. The transverse slide has an aperture through which the tool bit passes. The transverse slide and the tool bit are arranged such that the transverse slide and the tool bit move as a unit during the transverse excursions of the tool bit. There is further provided an inner seal disposed in the housing part between the transverse slide and the tool bit guide externally thereof. The inner seal surrounds the tool bit and is in a resilient contacting relationship therewith.

Claims16

Dependent claims

A percussion tool comprising

(a) a housing part having a frontal end provided with an opening;
(b) a tool bit guide supported in alignment with said opening;
(c) a tool bit slidably supported in said tool bit guide and projecting from said housing part through said opening;
said tool bit having a longitudinal axis and being arranged for a reciprocating motion parallel to said longitudinal axis in an impacting direction and for transverse excursions substantially perpendicular to said longitudinal axis;
(d) a transverse guide attached to said housing part;
(e) an outer seal composed of a transverse slide displaceably received in said transverse guide;
said transverse slide having an aperture through which said tool bit passes;
said transverse slide and said tool bit being arranged such that said transverse slide and said tool bit move as a unit during the transverse excursions of said tool bit;
(f) an inner seal disposed in said housing part between said transverse slide and said tool bit guide externally thereof;
said inner seal resiliently contacting said tool bit;
and
(g) holding means for positioning said inner seal.

9 more elements

Dependencies are inferred from the claim text.