Abstract: A signal transmission device is used for connection between a first electrical connector at a truck-tractor of a towing vehicle and a second electrical connector at a trailer of the towing vehicle. The signal transmission device includes first and second magnetic holders, third and fourth electrical connectors mounted to the first and second magnetic holders respectively, a stretchable coil tube, and a cable. The first magnetic holder is adapted to be attached to the truck-tractor and the second magnetic holder is adapted to be attached to the trailer. The third electrical connector is adapted for connecting the first electrical connector at the truck-tractor and the fourth electrical connector is adapted for connecting the second electrical connector at the trailer. The cable is spirally inserted through the stretchable coil tube and provided with two ends electrically connected with the third and fourth electrical connectors.

Abstract: A tire pressure sensor including a body, a sealing member and a circuit and signal transmission apparatus is provided. The body includes a first casing, a first hole, a receiving portion and a second casing. The receiving portion connects with the first hole passing through the first casing. The sealing member includes a second hole that is set through the rubber component of and communicates with the first hole. The sealing member is located in the receiving portion. The circuit and signal transmission apparatus includes a circuit apparatus and a hole. The hole positioned on the surface of the circuit apparatus communicates with the first hole and second hole to form an air seal channel. The air pressure of the tire is injected through the air seal channel into the hole, and the tire pressure sensor can detect the pressure and temperature of the air of the tire.

Abstract: An attached tire pressure sensor and air nozzle assembly includes an air nozzle for installation in the rim of a vehicle wheel, an attached tire pressure sensor threadedly coupled with the air nozzle for sensing the tire pressure of the vehicle wheel, and an anti-loosing device sandwiched between the air nozzle and the attached tire pressure sensor. The anti-loosing device has a rigid base stopped against the air nozzle, and a curved spring washer stopped against the attached tire pressure sensor to provide a spring force to the air nozzle and the attached tire pressure for preventing the attached tire pressure sensor from loosing from the air nozzle upon receiving vibration or accidental impact of the vehicle wheel during running of the vehicle.

Abstract: A tire pressure gauge includes a housing, a tire pressure detection unit, an air valve, and at least two limit members. The housing has a lateral side and a chamber. The tire pressure detection unit is mounted in the chamber. The air valve is mounted to the housing, extending out of the chamber from the lateral side of the housing. The at least two limit members are mounted to the lateral side of the housing and located bilaterally at the air valve, each having an end surface to which the air valve is perpendicular. Accordingly, when the tire passes through the rough roadbed to be violently shocked or impacted, the tire pressure gauge of the present invention remains in original position because of positioning efficacy of the two limit members.

Abstract: A signal transmission device is used for connection between a first electrical connector at a truck-tractor of a towing vehicle and a second electrical connector at a trailer of the towing vehicle. The signal transmission device includes first and second magnetic holders, third and fourth electrical connectors mounted to the first and second magnetic holders respectively, a stretchable coil tube, and a cable. The first magnetic holder is adapted to be attached to the truck-tractor and the second magnetic holder is adapted to be attached to the trailer. The third electrical connector is adapted for connecting the first electrical connector at the truck-tractor and the fourth electrical connector is adapted for connecting the second electrical connector at the trailer. The cable is spirally inserted through the stretchable coil tube and provided with two ends electrically connected with the third and fourth electrical connectors.

Abstract: A three-way connecting device for a tire pressure detector includes a three-way pipe and a nozzle. The three-way pipe has a tunnel therein, a first opening, a second opening and a third opening communicated with the tunnel, a first coupling portion around the first opening to connect an air pump to the first opening, a second coupling portion around the second opening to connect a tire pressure detector to the second opening, a third coupling portion around the third opening to connect a nozzle of a tire to the second opening. The nozzle is mounted in the first opening of the three-way pipe to be connected to the air pump. The three-way connecting device may help the inflation of tire without having to disassemble and reassemble the tire pressure detector.

Abstract: A tire pressure sensor including a body, a sealing member and a circuit and signal transmission apparatus is provided. The body includes a first casing, a first hole, a receiving portion and a second casing. The receiving portion connects with the first hole passing through the first casing. The sealing member includes a second hole that is set through the rubber component of and communicates with the first hole. The sealing member is located in the receiving portion. The circuit and signal transmission apparatus includes a circuit apparatus and a hole. The hole positioned on the surface of the circuit apparatus communicates with the first hole and second hole to form an air seal channel. The air pressure of the tire is injected through the air seal channel into the hole, and the tire pressure sensor can detect the pressure and temperature of the air of the tire.

Abstract: A tire pressure gauge includes a housing, a tire pressure detection unit, an air valve, and at least two limit members. The housing has a lateral side and a chamber. The tire pressure detection unit is mounted in the chamber. The air valve is mounted to the housing, extending out of the chamber from the lateral side of the housing. The at least two limit members are mounted to the lateral side of the housing and located bilaterally at the air valve, each having an end surface to which the air valve is perpendicular. Accordingly, when the tire passes through the rough roadbed to be violently shocked or impacted, the tire pressure gauge of the present invention remains in original position because of positioning efficacy of the two limit members.

Abstract: A dual-sectional monitor signal transmission module for Wireless Tire Pressure Monitoring Systems. On one side of this monitor signal transmission module, an air tap is designed, which can be assembled and fixed in the hole of the tire rim. This Monitor Signal Transmission Module and the air-tap are a dual-sectional combination to allow the air-tap to be fittingly snapped into the hole on the tire rim. Moreover, a mounting seat is designed on the Monitor Signal Transmission Module at the end where the air-tap is to be positioned so that the air-tap and the outer-end of the mounting seat can be connected in a counter-screw setup. The Monitor Signal Transmission Module can be easily detached with just a simple step of unscrewing the air-tap when replacing tires.

Abstract: A shell structure for Wireless Tire Pressure Transmission Devices. The internal part of this shell is a space provided for installation of a Wireless Tire Pressure Transmission Device and the bottom part of the shell is a fixture dimension which enables attachment of the Wireless Tire Pressure Transmission Device onto the surface of the tire-rim. On the two ends of the shell, wire-holes are designed to provide for wire-fixing. The fixture dimension on the bottom of the shell, viewed from the cross-section, is designed in a slanting dimension. Or, the wire-holes of the shell can be designed to form a slanting angle to replace the above-stated slanting dimension of the shell-fixing surface.