Abstract: A shock attenuating coupling device is provided for a rotary impact tool for drivingly connecting a hammer mechanism to a drive anvil. The shock attenuating coupling device includes a first coupling member, a second coupling member, a drum, a shoe, and a body of resilient material. The first coupling member has a first drive portion. The second coupling member has a second drive portion. The drum is provided proximate the first drive portion and the second drive portion and has a radially inner engagement surface. The shoe is provided within the drum and between the first drive portion and the second drive portion. The shoe has a radially outer surface capable of being expanded in a radially outer direction. The body of resilient material is interposed between the drum and the shoe.

Abstract: A pressure regulating air valve assembly (100) for a pneumatic tool (90) is disclosed that is movable between an open position and a closed position such that the maximum pressure in the tool is limited to a predetermined value. The valve assembly include a fitting (110) with a central aperture (112) and an upper portion (114). A valve plate (130) is disposed in the fitting, and a collar (140) having an aperture (146) is retained in the fitting. A proximal end of a tubular piston (120) extends through the aperture, and a spring (118) biases the piston toward an open position. When the pressure in the hand tool exceeds a predetermined value, the pneumatic force on a distal annular head (126) of the piston urges the piston toward the valve plate (130), closing the valve. The valve plate may include a centering portion (134) and an elastomeric panel (136).

Abstract: A pressure regulating air valve assembly (100) for a pneumatic tool (90) is disclosed that is movable between an open position and a closed position such that the maximum pressure in the tool is limited to a predetermined value. The valve assembly include a fitting (110) with a central aperture (112) and an upper portion (114). A valve plate (130) is disposed in the fitting, and a collar (140) having an aperture (146) is retained in the fitting. A proximal end of a tubular piston (120) extends through the aperture, and a spring (118) biases the piston toward an open position. When the pressure in the hand tool exceeds a predetermined value, the pneumatic force on a distal annular head (126) of the piston urges the piston toward the valve plate (130), closing the valve. The valve plate may include a centering portion (134) and an elastomeric panel (136).

Abstract: A shock attenuating coupling device is provided for a rotary impact tool for drivingly connecting a hammer mechanism to a drive anvil. The shock attenuating coupling device includes a first coupling member, a second coupling member, a rolling member and a spring. The first coupling member has a longitudinal drive portion with an input end configured to couple for rotation with a hammer mechanism. The first coupling member also has an output end with a first engagement portion having a first ramped groove. The second coupling member is coaxial with the first coupling member and has an output end configured to couple for rotation with a drive anvil. The second coupling member also has an input end with a second engagement portion having a second ramped groove extending in a direction opposite a direction of the ramped groove. The second engagement portion is configured to cooperate with the first engagement portion. The rolling member is provided between the first ramped groove and the second ramped groove.