Abstract: A wheel rim assembly is disclosed to include a wheel rim body holding a tire, a plurality of smoothly arched frame bars connected to one another around the periphery of the wheel rim body by plugging a plug at one frame bar into a plughole at another frame bar and hanging a hanger at one frame bar on a locating block at another frame bar, a plurality of packing members respectively fastened to the frame bars to enhance the connection between each two adjacent frame bars, and an annular cushion holding the frame bars and the packing members on the inside around the wheel rim body for supporting the wheel in case the wheel is broken accidentally.

Abstract: A wheel rim is constructed to include a wheel rim body holding a tire, a mounting ring formed of two semicircular frame bars and mounted on the wheel rim body to hold a packing rubber, and a supplementary tire support mounted on the mounting ring around the wheel rim body and supported on the packing rubber for supporting the tire for enabling the car to run to a repair shop in case the tire is broken during running.

Abstract: A wheel rim is constructed to include a wheel rim body holding a tire, and a supplementary tire support mounted on a flange around the periphery of the wheel rim body for supporting the tire for enabling the car to run to a repair shop in case the tire is broken during running.

Abstract: An auxiliary wheel rim for use in a vehicle wheel for enabling the car driver to drive the car to the repair shop safely upon explosion of the tire is disclosed to include a plurality of first rim element, a second rim element, a third rim element, a plurality of links respectively fastened to the lugs of the first, second and third rim elements with pins to connect the first rim elements in series between the second rim element and the third rim element; and screw bolt fastened to the second and third rim elements to connect the linked first, second and third rim elements into the desired annular auxiliary wheel rim.

Abstract: An improved vibration attenuator for reducing undesired vibrations generated by cutter bits being drawn across the faces of a rotating brake rotor. The attenuator has friction pads with engagement members that extend therefrom which are configured to cause force to exerted on the cutter bits in a direction parallel to the surface being machined and perpendicular to the direction of rotation of the rotor.

Abstract: A rotate percussion hammer/drill shift device suitable for hand drill is provided. It is disposed at an output spindle of a drill to provide the drill with a percussion function. It further comprises at least a stationary percussion cam, an output shaft which is connected to the output spindle of the drill in a coaxial manner wherein said output shaft can be selectively moved to an working position from a normal position, this output shaft further includes a rotary cam by which the output shaft may rotate synchronously with the spindle of the drill, and a clutch mechanism which retains the output in the normal position and permits the output to be moved to a working position. When the output shaft is moved to the working position, the percussion cam is in contact with the rotary cam which is rotating such that the rotary cam generates a periodical hammer movement in the axial direction. Consequently, the output shaft is provided with a hammer movement.