Abstract: A tube connector has a main body, a restricting element, and a sealing ring. The main body has a mounting segment extending outwardly and transversely to form an inner annular space to accommodate the restricting element and the sealing ring. When the tube body is inserted, the tube body will be engaged and positioned by teeth of the restricting element. The sealing ring and the restricting element abut each other to maintain the sealing from the sealing ring. The changes of the pressure from the fluid transporting in the tube body will move the tube body and the main body relatively to and fro, and thus the abutting force against the sealing ring will increase or decrease accordingly, which maintains the elasticity of the sealing ring to maintain the sealing after a long time of use, thereby avoiding elastic fatigue and prolonging the lifespan.

Abstract: A tube connector has a main body, a restricting element, and a sealing ring. The main body has a mounting segment extending outwardly and transversely to form an inner annular space to accommodate the restricting element and the sealing ring. When the tube body is inserted, the tube body will be engaged and positioned by teeth of the restricting element. The sealing ring and the restricting element abut each other to maintain the sealing from the sealing ring. The changes of the pressure from the fluid transporting in the tube body will move the tube body and the main body relatively to and fro, and thus the abutting force against the sealing ring will increase or decrease accordingly, which maintains the elasticity of the sealing ring to maintain the sealing after a long time of use, thereby avoiding elastic fatigue and prolonging the lifespan.

Abstract: A circular saw is composed of a working platform, a saw base with saw plate, and a saw cover, wherein the saw base and the saw cover are combined together to perform a dust-collecting hood with a bottom opening to accommodate the saw plate. The dust-collecting hood has a first air-hole defined on a top and a second air-hole defined on a sidewall respectively to completely keep the swarf and dust inside the dust-collecting hood to sufficiently improve the dust-collecting efficiency. Moreover, the saw base and the saw cover have an enclosed sheet respectively to make the bottom opening narrowed to only allow the saw plate passing therethrough to further significantly improve the dust-collecting efficiency, to achieve highly efficiency for collecting swarf and dust, and to keep working environment clean.

Abstract: A lamp set for a bicycle comprises a lamp base, a connector, and an annular fastener, wherein the lamp base includes a housing, and the connector can engage the housing; the fastener is mounted around a bicycle frame and disposed with a connecting part for connecting to the connector; characterized in that the housing is disposed with an engaging part in its lower part, and the engaging part includes a first indentation and a second indentation which are mutually communicated, wherein the length of the second indentation is longer than the first indentation, and the connector is disposed with two engaging members having a spacing between the engaging members, and the engaging members are disposed with an engaging block respectively that the engaging blocks are capable of being squeezed by the first indentation to compress the spacing between the two engaging members while the engaging members enter the first indentation, and the spacing between the engaging members is recovered after the engaging members pass

Abstract: A circular saw with a dust-collecting hood is to provide a circular saw structure with high dust-collecting efficiency, excellent safety and convenience in operation. By designing the dust-collecting hood and its location, the dust-collecting hood has surrounding wings to snugly attach to a main body of the circular saw and to further close two sides of a saw sheet so that small pieces and dust do not disperse and can be conducted into the dust-collecting hood by the air current when sawing. Moreover, an outer current is provided to suck the small pieces and dust out of the dust-collecting hood to significantly improve the dust-collecting efficiency. Because the structure is simple, the circular saw has low manufacturing cost and other advantages such as long lifetime and stable safety.