A pneumatic rotation grinder comprises a housing (10) with a throttle valve controlled air inlet passage, a rotation motor drivingly connected to an output shaft (12) intended to carry a grinding tool, a safety guard (17) adjustably supported on the housing (10) in a coaxial disposition relative to the output shaft (12), and a lock device (26-28, 33-38) for arresting the safety guard (17) in desired angular positions relative to the housing (10). The lock device (26-28, 33-38) comprises both a l...

The improved grinder of this invention is provided with a non-circular peripheral surface encompassing an output shaft. The non-circular peripheral surface is arranged to receive a mating hole in a grinder wheel guard. The grinder wheel guard is positioned on the grinder by means of a threaded fastener or the like and is sufficiently large to house an appropriate grinder wheel. The arrangement between the non-circular peripheral surface on the grinder and the mating hole in the grinder wheel gua...

A vibration damped hand held rotary grinding machine comprising a housing (10), a rotation motor (11), an output shaft (13) drivingly coupled to the motor and having a mounting (14) for attachment of a grinding wheel (15), two handles (17, 18) rigidly mounted on the housing (10) and extending in right angles relative to the output shaft (13) as well as to each other, and a sector-shaped non-resilient safe guard (19) which is rigidly attached to the housing (10) and surrounding partially the grin...

In a portable machine tool comprising a protective hood mounted by means of a holding part for rotation on a clamping neck of the portable machine tool, in order to prevent unintentional adjustment of the protective hood, it is proposed that the holding part of the protective hood and a locking part facing the holding part and held in a rotationally fixed manner on a grinder housing in the region of the clamping neck be provided with locking elements which can be brought into engagement with one...

A dust-collecting receptacle for an electric hand machine tool, in particular an electric hand grinder, having a dust-collecting chamber (17), an inlet fitting (21), an exhaust opening (18), and a dust filter (20) situated between the dust-collecting chamber (17) and the exhaust opening (18). To achieve a compact design of the dust-collecting receptacle (14) that on the one hand, does not impair operation of the electric hand grinder or only does so to an insignificant degree and on the other ha...

A dustless sander has a sanding body with a flat front face. Two exhaust openings open into the back face of the sanding body. Each is associated with a series of vacuum passages that radiate from the exhaust opening. Inlet openings through the front face communicate with the exhaust openings and the vacuum passages. The inlet openings communicating directly with the exhaust openings are smaller in diameter than the inlet openings communicating with the vacuum passages. The sander is equipped wi...

The disclosure relates to an attachment for conventional vibratory sanders, which attachment includes a plate adapted to be attached to the power section of such sander. The plate has attached thereto several mandrels of different configuration to receive shuts of abrasive material. The sander with the attachments thereon may be used to clean and smooth holes or slots of various shapes and sizes etc.

A vibration damped hand held rotary grinding machine comprising a housing (10) with at least one handle (17, 18), a rotation motor (11), an output shaft (13) drivingly coupled to the motor and having a mounting (14) for attachment of a grinding wheel (15), and a sector-shaped non-resilient safe guard (19) which is rigidly attached to the housing (10) and surrounding partially the grinding wheel (15) and which has an arc-shaped rim portion (20) encircling partially the grinding wheel circumferenc...

A power hand tool has a gear box casing having an opening, at least one high speed shaft extending through the opening, sealing member for sealing the gear box casing against lubricant leakage. The sealing member includes a sealing washer which does not rotate and sits tightly on the shaft and which radially touches a circumference of the opening. The sealing washer is composed of an elastic material which can absorb and release lubricant.

An adjustable handle is attached to a power tool having a tool head and a motor housing. When the handle is loosened, the tool head can rotate relative to the motor housing and the handle can be rotated relative to the power tool. When the handle is tightened, the tool head does not rotate relative to the motor housing and the handle does not rotate relative to the power tool. The adjustable handle allows the user to easily reconfigure the power tool for use in confined spaces or special applica...