Pneumatic hammer nozzle seal

A nozzle seal for restricting pneumatic leakage from a nozzle hole of a pneumatic hammer having a tool shank movable therein, comprising, a bushing member having a first bore therethrough adapted to be press-fit into the nozzle hole, the bushing member having a first mating surface adjacent one end of said first bore;

• a retainer member having a second bore therethrough aligned with said first bore and adapted to be slip-fit into the nozzle hole, the retainer member having a second mating surface mating with said first mating surface and a recess adjacent said second mating surface;
• and a seal member having a third bore therethrough aligned with said first and second bores and disposed in said recess of said retaining member, said third bore being of a size to closely receive the tool shank;
• said first and second mating surfaces each including a transverse surface and a bevel surface for preventing relative rotation between said bushing member and said retainer member within the nozzle hole.

A nozzle seal for restricting pneumatic leakage from a nozzle hole of a pneumatic hammer having a tool shank movable therein, comprising, a bushing member having a first bore therethrough adapted to be press-fit into the nozzle hole, the bushing member having a first mating surface adjacent one end of said first bore;

• a retainer member having a second bore therethrough aligned with said first bore and adapted to be slip-fit into the nozzle hole, the retainer member having a second mating surface mating with said first mating surface and a recess adjacent said second mating surface;
• and a seal member having a third bore therethrough aligned with said first and second bores and disposed in said recess of said retaining member, said third bore being of a size to closely receive the tool shank;
• said retainer member including a pin extending from said recess, said seal member including an aperture for receiving said pin to rotationally align said second bore of said retainer member with said third bore of said seal member.

In a pneumatic hammer, having a nozzle hole with a tool shank movable therein, the improvement comprising, a bushing/retainer member having a bore therethrough for movably receiving the tool shank, which bushing/retaining member being fixedly mounted within the nozzle hole, said bushing/retainer member having a recess therein, and a seal member disposed in the nozzle hole in said bushing/retainer member recess, said seal member having a bore therethrough for receiving and closely fitting around the tool shank, said recess being of a size at least slightly larger than said seal member, whereby pressurized pneumatic fluid produced by the pneumatic hammer is substantially restricted from leaking out through the nozzle hole.