Pneumatic impact breaker

B - Operations – Transporting – 25 – D

Patent

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Details

B25D 17/24 (2006.01) B25D 9/14 (2006.01) B25D 9/16 (2006.01) F01L 25/04 (2006.01)

Patent

CA 2184264

A pneumatic impact breaker comprises a housing (11) with a cylinder bore (20), a hammer piston (28) with a piston head (63) and an impact delivering stemportion (64), an anvil (14) displaceably supported in a cylinder bore extension (50) and normally abutting against the shank (15) of a working implement (16), an annular energy absorbing air cushion chamber (59) is formed between the hammer piston (28), the cylinder bore (20) and an annular shoulder (49) in the cylinder bore (20), wherein the piston head (63) is formed with two axially spaced end portions (65, 66) for guiding and sealing cooperation with the cylinder bore (20). The length of the piston head (63) is considerably larger than the length of the stem portion (64), and the radial play between each one of the end portions (65, 66) and the cylinder bore (20) is smaller than the play between the stem portion (64) and the cylinder bore extension (50), whereby is guaranteed a non-metallic yet effectivesealing cooperation between the stem portion (64) and the cylinder bore extension (50) and an improved tightness of the energy absorbing air cushion chamber (59).

Concasseur à percussion pneumatique comprenant un logement (11) accueillant un alésage de cylindre (20), un piston-marteau (28) muni d'une tête de piston (63) et d'une partie tige (64) qui transmet l'impact, une enclume (14) se déplaçant à l'intérieur d'un prolongement de l'alésage (50) et butant normalement contre la queue (15) d'un outil (16), une chambre annulaire à coussin d'air à absorption d'énergie (59) étant ménagée entre le piston-marteau (28), l'alésage (20) et un épaulement annulaire (49) dans l'alésage (20), dans lequel la tête de piston (63) comporte deux parties extrêmes (65, 66) espacées axialement pour coopérer avec l'alésage (20) à des fins de guidage et d'étanchéité. La tête de piston (63) est considérablement plus longue que la partie tige (64), et le jeu radial entre chacune des parties extrêmes (65, 66) et l'alésage (20) est inférieur au jeu entre la partie tige (64) et le prolongement de l'alésage (50), ce qui garantit une coopération à des fins d'étanchéité non métallique mais néanmoins efficace entre la partie tige (64) et le prolongement de l'alésage (50) ainsi qu'une herméticité améliorée de la chambre à coussin d'air à absorption d'énergie (59).

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