Abstract: A hand-held power-driven tool for operating a work member in conditions in which fairly extreme vibrations are generated is constructed of rigid parts isolated from each other by elastomer shock-absorbing material arranged between the parts in laminar fashion in which certain of the layers are of different Shore A hardness as respects each other. The layers are also formed with different thicknesses and are introduced into an annular space between the parts in pourable condition, each layer being permitted to set up before the next layer is pourable, resulting in bonding of the elastomer layers to each other as well as to the parts. A novel supporting structure is disposed between the parts to space them in condition to receive the elastomer material and the structure is permitted to remain between the parts in such isolated or shock-absorbing fashion as to improve the vibration-minimizing charactreistics of the overall design.

Abstract: The improved grip is furnished as an adjunct to a tool of the type featuring a horizontal part; e.g., a handle, which carries, for example, a working member such as a rotary slicer operating in a plane parallel to the plane that includes the axis of the handle. The grip is mounted in a position in which it extends upwardly in upright fashion from the aforesaid plane and is mounted on the tool by means including vibration-damping material, which, in conjunction with the upright posture of the grip, minimizes physical tensions in the hand and wrist/forearm of the user. The attachment also includes a rest for the user's wrist/forearm.

Abstract: A rotary hand-held powered tool such as a grinder has an outer casing of rigid material and formed with a cavity in which is disposed a motor housing isolated from the casing by elastomer shock-absorbing material of the type that is pourable into the bell-shaped space between the motor housing and interior of the casing and which subsequently cures to become bonded to the interior surface of the casing and to the outer surface of the motor housing. The elastomer material is introduced to the bell-shaped space in laminar form; that is, in a series of stacked layers which vary as to Shore A hardness. The casing has a pair of handles rigidly attached thereto and configured to extend upwardly and forwardly with respect to the position of a user standing behind the casing.

Abstract: A rotary power tool of the type having a cavity in which is housed a motor containing a rotary shaft is improved by the use of vibration-damping material interposed between the interior of the cavity and the exterior of the motor housing. In one instance of a tool in which the motor is of the air-driven type, the motor housing and casing are ported and the vibration-damping material is configured to enable communication among the ports. In one form of design, the vibration-damping material comprises a sleeve fitting the casing cavity but annularly spacedly surrounding the motor housing but that housing includes axially spaced apart rings of vibration-damping material that tightly encircle the housing and also tightly fit within the sleeve.

Abstract: A portable tool of the basic type generating vibration during operation is improved by the provision of a hollow insert into the cavity or space of the handle that is filled with shock-absorbent material. The insert opens at the front of the handle and is internally threaded to receive the externally threaded rear part of the barrel, for example, of an accessory or attachment, such as a chipper, chisel or the like. A separable lock is provided for preventing accidental unscrewing of the barrel.

Abstract: A portable, hand-held tool of the type generating vibration during operation is improved by a construction in which the forward barrel-like part of the tool is embraced by an elastomer-filled cavity or cup in a barrel-related handle, the handle and barrel being typically rigid but separate and secured together by only the elastomer material. The cup-like part of the handle surrounds the rear part of the barrel to afford an annular space, which is filled with initially flowable and subsequently curable elastomer, notably of polyurethane. The base or radial rear wall of the cup is spaced to the rear of the radial rear end of the barrel and this space is contiguous with the annular space and is also filled with the elastomer material. This wall has a through opening to allow for temporary deformation of the elastomer during operation of the tool.