Pneumatic hammer nozzle seal

Tool driving or impacting – Impacting devices – With means for rotating tool

Patent

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Details

173139, 279 197, 277188R, B25D 1708, B23B 3120

Patent

active

043323006

ABSTRACT:
A nozzle seal for restricting pneumatic leakage from the nozzle hole of a pneumatic hammer having a tool shank movable therein, comprising, a bushing member and a retaining member axially aligned in the nozzle hole of the pneumatic hammer with a seal member therebetween. Bores are provided through the bushing member, retainer member and seal member for accepting the tool shank with the seal member having a bore closely fit around the tool shank to prevent a leakage of air from the interior of the hammer through the nozzle hole. The bushing member is press-fit and firmly held in the nozzle hole while the retainer member is slip-fit into the hole to facilitate its removal and access to the seal member. The bores may be polygonal, circular or oval to accept tool shanks of corresponding cross-sectional shapes. An O-ring may be provided on the retainer member for establishing a hermetic seal between the retainer member and the nozzle housing and a pin may be provided on the retainer member extending through an aperture in the seal member to establish a proper orientation between the bores of the retainer and bushing members and the bore of the seal member.

REFERENCES:
patent: 1792893 (1931-02-01), Collins
patent: 3752241 (1973-08-01), Bent
patent: 3905609 (1975-09-01), Sussman
patent: 4189162 (1980-02-01), Rasmussen et al.

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