Abstract: A folding knife convenient to carry comprises a left handle plate and a right handle plate mutually connected via a fixing element, a blade mounted between the left handle plate and the right handle plate through a pivot, and a leaf spring connected to or integrally formed with the left handle plate or the right handle plate, wherein when the blade is in its open position, the leaf spring retrieves its normal position under the blade and presses its head top surface against a rear end of the blade that an angle A is formed between the head top surface of the leaf spring and the vertical cross surface of the blade, and when the blade is in the folded position, the leaf spring is depressed laterally to move to a predetermined space defined between the left or the right handle plate to the blade, wherein an angle B equal to the angle A is formed between the rear end of the blade and the vertical cross surface to make the rear end of the blade meets the head top surface of the leaf spring, and the rear end of the

Abstract: An improved structure of tube lamp comprises a plastic tube having a power supply wire inside the tube and a plurality of parallel connected light bulb sets, wherein the light bulb sets consist of a plurality of serially connected light bulbs; a thicker metal wire is disposed inside the tube, is bended as desired and parallels the power supply wire, whereby the tube lamp is easily bended into a different model without any assistant frame. For any purpose, e.g. advertisements or festivals, construction is facilitated, cost is reduced and reusability is enhanced.

Abstract: An improved structure of tube lamp comprises a plastic tube having a power supply wire inside the tube and a plurality of parallel connected light bulb sets, wherein the light bulb sets consist of a plurality of serially connected light bulbs; a thicker metal wire is disposed inside the tube, is bended as desired and parallels the power supply wire, whereby the tube lamp is easily bended into a different model without any assistant frame. For any purpose, e.g. advertisements or festivals, construction is facilitated, cost is reduced and reusability is enhanced.

Abstract: A circuit mounted in a housing of a connector for ensuring that the connector safely transmits an electric power provided by a first power source to a power-receiving device is provided. The circuit includes a sensor and a switch. The sensor is used for sensing a first electric signal released from the power-receiving device and a second electric signal from a second power source disposed in the connector respectively, and generating a first control signal and a second control signal correspondingly. The switch is used for switching on/off a communication channel between the first power source and the power-receiving device in response to the first control signal and the second control signal respectively.