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EP0126041A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Percussion tool

Assignee: Atlas Copco AB
•
Filing: 1984-01-18
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Granted: —
•
Expires: 2004-01-18
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Abstract

Abstract A power operated percussion tool in which a shoulder (28) in the tool housing (10,17) defines a rear rest position for a working implement (12) attached tothetool, and in which an energy absorbing bias unit (23, 31) is arranged to resiliently load the working implement (12) toward the rest position. The bias unit (23, 31) comprises a spring (23) and a shock wave mitigating ring assembly (31) and acts between a rearwardly facing shoulder (22) in the housing (10, 17) and a forwardly facing shoulder (30) on the working implement (12). The ring assembly (31) includes two spring steel rings (32, 33) formed with mating conical contact surfaces for transforming axial load variations into radial deformation of the rings (32, 33).

Inventors

  • 👤 Per Adolf Lennart Gidlund

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-23 23:58
CPC Classifications
B; B22; B22D; B22D31/00; B25; B25D; B25D17/00; B25D17/08; B25D17/24

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 154 words
Percussion tool comprising a housing (10, 17), a hammer piston (11) reciprocably powered in the housing (10,17), a front opening (21) in the housing (10,17) for receiving the rear end portion of a working implement (12), a forwardly facing shoulder (28) in the housing (10, 17) is arranged to be abutted by a rearwardly facing shoulder (29) on the working implement (12) to define an axial rest position for the working implement (12) relative to the housing (10, 17), and an energy absorbing bias unit is inserted between a rearwardly facing shoulder (22) on the housing (10, 17) and a forwardly facing shoulder (30) on the working implement (12) for resiliently loading the working implement (12) toward said rest position, characterized in that said bias unit comprises a spring (23) and a shock wave mitigating ring assembly (31) located between said spring (23) and said forwardly facing shoulder (30) on said working implement (12).
Claim 2
Dependent Claim 154 words
Percussion tool comprising a housing (10, 17), a hammer piston (11) reciprocably powered in the housing (10,17), a front opening (21) in the housing (10,17) for receiving the rear end portion of a working implement (12), a forwardly facing shoulder (28) in the housing (10, 17) is arranged to be abutted by a rearwardly facing shoulder (29) on the working implement (12) to define an axial rest position for the working implement (12) relative to the housing (10, 17), and an energy absorbing bias unit is inserted between a rearwardly facing shoulder (22) on the housing (10, 17) and a forwardly facing shoulder (30) on the working implement (12) for resiliently loading the working implement (12) toward said rest position, characterized in that said bias unit comprises a spring (23) and a shock wave mitigating ring assembly (31) located between said spring (23) and said forwardly facing shoulder (30) on said working implement (12).
Claim 3
Dependent Claim 51 words
Percussion tool according to claim 1, wherein said ring assembly (31) comprises two ring elements (32, 33) formed with mating conical contact surfaces for transforming to a certain extent and under frictional resistance variations in the axial load on said elements (32, 33) into a radial elastic deformation of the latters.

References Cited (Backward Citations)

FR2163287A5 Cited
US3861494A Cited
GB1539157A Cited
WO1979000496A1 Cited
GB2020598A Cited
EP0017635A1 Cited
EP0055244A1 Cited
DE3123537A1 Cited

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