Abstract: A connector and circuit board suitable for multiple transmission interfaces, which can be applied to storage devices or computer devices is disclosed. The connector device includes a connector case, and two transmission interfaces respectively disposed on upper and lower sides of the connector case. One end connector case serves to electrically connect with the circuit board, and another end serves as the transmission interfaces complying with at least two different specifications. Thus, the users may select suitable transmission interface according to actual needs.

Abstract: A connector adaptor suitable for various transmission protocols is disclosed. The connector includes a hollow case, two positioning sets, two terminal sets. The two positioning sets are formed on the upper side and a lower side of said hollow case. The two terminal sets are connected to the positioning sets respectively, and said terminal sets are respectively connected to a flat face of said positioning set for an electrical connection. The hollow case is made in a plastic injection process.

Abstract: A structure fastens the seat of a chair to a support shaft of the base of the chair. The structure includes a fastening plate and a fastening seat. The fastening plate is fastened to the underside of the seat of the chair. The fastening seat is fastened pivotally to the fastening plate and is provided with a tapered protrusion having a through hole for receiving the support shaft of the base of the chair. The tapered protrusion is integrally made with the fastening seat.

Abstract: An improved ellipsograph for drawing ellipses, ovoids and circles comprises a frame, a slide block, a disc, a worm wheel, a pivot adjusting block, a stub adjusting block, a motor, a battery holder and a drawing arm. The disc and the worm are screwed together and fitted in the round opening of the slide block. The pivot adjusting block and the stub adjusting block are fitted respectively in the worm wheel and the disc. When the motor is started the screw shaft will cause the worm wheel to turn and the pivot on the pivot adjusting block will circumambulate with the worm wheel. At the same time, the stub on the stub adjusting block fitted in the slot of the frame will roll along the slot due to the tangential force of the worm wheel and cause the slide block with the worm wheel and the disc as a whole to move straightly back and forth.