Abstract: The present invention relates to an expander for the oral cavity's rehabilitation ' and more particularly to a kind of elastic clip having one adjusting end and one occlusive end thereat, wherein a screw is pivoted onto the upper brace of the said adjusting end, and then one end of the screw is pushed through a lower brace, while a nut is screwed onto the said screw at the portion in-between the upper and lower braces, or alternatively, having a spring and a nut be mounted successively onto the said screw after it has been pushed through the said lower brace, and therefore it would be applicable to do the necessary exercise with different extent in opening her or his mouth and muscular force while an user is adjusting both the opening distance and also the elastic tension of the occlusive end positioned at the other end of the said elastic clip, by means of adjusting each nut, and thus while a patient is biting at the said occlusive end of the said elastic clip, the patient would be able to achieve with a pro

Abstract: A car silencer includes an outer pipe having a front expansion chamber defined in a front portion of the outer pipe connected with a connecting tube which is connected to an engine manifold for directing waste gas as discharged from a car engine, an inner pipe detachably inserted in a rear expansion chamber in the outer pipe at a rear portion of the front expansion chamber, an absorbing and filtering medium filled in the inner pipe, and a perforated tail pipe inserted in the absorbing and filtering medium, wherein an engine exhaust gas will be reduced its sound in the front and rear expansion chambers and a plurality of pollutants laden in the exhaust gas will be absorbed, filtered and removed in the absorbing and filtering medium for preventing air pollution caused by an engine waste gas.

Abstract: A tire dismantling and setting device includes a roller holder for loading or holding tires thereon, an axle retainer pre-fixed on a car axle, a driving bolt rotatably secured on the roller holder, and a pair of tire fasteners fastening the tires on the roller holder, whereby upon a clockwise rotation of the driving bolt to urge the bolt coupled with the axle retainer against the car axle, the holder and the fastened tires can be dismantled conveniently and safely. When rotating the driving bolt counter-clockwise, the bracket, the tire fastener and the fastened tires are pushed rearwardly to be mounted on a car axle conveniently.