| 主权项 |
1. A hand-held pneumatic scabbler for demolition and resurfacing operations, said scabbler comprising a cylinder having at least one piston for receiving a tool bit for acting on a working surface; a forward and a rear handle to be held by an operator for maneuvering the scabbler during operation, said forward handle being arranged between the cylinder and said rear handle, said forward handle having a connection that is damped for vibration; a tube for supplying pressurized gas to said cylinder, one end of said tube being connected to the cylinder through a flexible coupling engaging the cylinder, the other end of said tube being coupled to a source of pressurized gas; wherein the flexible coupling is designed to allow only limited torsional movement of the cylinder, and the end of the tube connected to the cylinder, relative to the flexible coupling; said flexible coupling comprising: 1) an axle spindle arranged with its direction of longitudinal extension along a central axis extending through said flexible coupling, and a swivel arranged with play between it and the axle spindle, 2) a race with balls arranged to lock the swivel in an axial direction on the axle spindle and to make possible approximately friction-free pivot action between the axle spindle and the swivel, and 3) a locking pin and a corresponding locking groove, said locking pin and said locking groove being arranged to provide said limited torsional movement of the cylinder. |
