Shock absorbing valve for a pneumatic tool

Details Shock absorbing valve for a pneumatic tool Shock absorbing valve for a pneumatic tool

2006-04-25

2006-04-25

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Impacting devices

With impact cushioning means

C173S206000

Reexamination Certificate

active

07032688

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). A shock absorbing valve (500) includes a floating collar (502) that is slidable along the casing (42) between two seal rings (504). A handle (34) is mounted to the floating collar (502). The floating collar (502) reciprocates along the casing (42) as fluid envelopes (506, 508) are exposed to atmosphere in an alternating manner through exhaust ports (530, 532) in the floating collar (502) to reduce pressure in the fluid envelopes (506, 508) thereby reducing shock to a user grasping the handle (34).

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