A compressed air supply system for vibro-isolated tools comprises a telescopic-tubular connection between the tool grip and the tool compressed air engine. A cut-off valve is mounted at the inlet to a supply duct through the grip, the outlet of the duct being connected to a pipe of the supply system mounted in the grip by means of an elastic connection. The pipe of the supply system has holes through the wall thereof with increasing diameters which, during motion of the tool housing relative to the compressed air engine, overlap with holes in an intermediate sleeve into which the air supply pipe slidably extends. The intermediate sleeve conveys the air to the air engine.
The invention is a pneumatic impact hammer in which the vibrations created in the motor portion of the tool are substantially reduced prior to reaching the tool's handle portion. The motor portion is allowed to move relative to the tool's handle portion and is located within a handle-attached cylindrical housing. Low-friction plastic bearings are located between the motor portion and the surrounding housing. The cycling valve that controls the reciprocating movement of the tool's piston is attached to the motor and receives air from a flexible air inlet tube that is slidably engaged to the motor and is secured to the tool's handle portion.
A pneumatic tool is disclosed which includes vibration mounts to reduce the vibration transferred to the user. The vibration mounts include a plurality of support members and at least one resilient vibration isolator connecting the support member in a spaced relationship. A compressed air conduit passes through the support member openings and includes at least one seal disposed between said support members and the air conduit.
A pneumatic tool is disclosed which includes vibration mounts to reduce the amount of vibration transferred to the user. The vibration mounts include a pair of support members and at least one resilient vibration isolator connecting the support member in a spaced relationship. A compressed air conduit passes through the support member openings but is only directly fastened to one of the support members.
A vibration isolation assembly is provided for use with a backfill tamper. In use, the vibration isolation assembly can be disposed between a handle and a percussion mechanism of the tamper and absorbs kickback forces from the percussion mechanism during backfill tamper operation. In one embodiment, the assembly includes an elongated conduit member that defines a passageway that allows compressed air to pass through the member to the percussion mechanism and a vibration dampening piston arrangement for absorbing feedback forces from the percussion mechanism during backfill tamper operation. The assembly may further include a spring arrangement for dampening vibration emanating from the piston.
A replaceable, flexible and resilient grip is slidably fitted over a generally cylindrical handle portion of a power hand tool housing. In one embodiment, for use with a pistol grip housing with a separable end cap, the grip has a flange which is clamped between the end cap and the barrel of the housing and has lugs which fit in recesses in the barrel and end cap. The grip also has a strap portion which fits between the trigger and the barrel and a flange which fits in a groove adjacent to the barrel. In another embodiment, the tool has an air exhaust port adjacent to the handle portion and the grip defines an exhaust air passage alongside the handle portion, the grip being held in place by a retaining plate.
