Pneumatic tool

Details Pneumatic tool Pneumatic tool

2005-08-23

2005-08-23

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Impacting devices

With impact cushioning means

C173S206000

Reexamination Certificate

active

06932166

ABSTRACT:
A pneumatic tool (20) for impacting a workpiece (22) is provided. The tool (20) comprises a casing (42) defining a chamber (48). A piston (54) is slidable within the chamber (48) along an operational axis (A). An exhaust valve (100) controlled by a pilot valve (200) slides the piston (54) by selectively introducing and releasing pressurized fluid into and out from the chamber (48). A tool bit (24) is slidable within the chamber (48) to impact the workpiece (22). Kinetic energy is transferred to the tool bit (24) from the piston (54) via an impact from the piston (54) as the piston (54) slides within the chamber (48). An energy absorbing mechanism (402) reduces the kinetic energy of the tool bit (24) after impact by the piston (54). The energy absorbing mechanism comprises a sleeve (404) that slides along the casing (42) and first (412) and second (414) pressure chambers that dissipate the kinetic energy of the tool bit (24) in multiple stages.

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Prior Offer for Sale dated Nov. 9, 1998; includes 2 pages of Bill of Materials and 9 pages of Drawings.

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