56results about How to "Avoid Electric Shock Hazard" patented technology

The invention relates to a circuit protective device which automatically monitors operation faults; the circuit protective device comprises an interrupter protective device of a grounding fault circuit, a grounding fault test circuit, a drive module, a solenoid loop and a circuit module which automatically monitors the operation faults; the circuit module which automatically monitors the operation faults consists of a main control system, a monitoring system and an indicating system. The main-control system is connected on the N wire of a power; the monitoring system is connected on the anodeof Q1 and the base electrode of Q3; the indicating system is connected on the two input power contact pins of the solenoid loop. The input end and the output end of the circuit module which automatically monitors the operation faults are connected with the output end of the interrupter protective device of the grounding fault circuit; the output end of the circuit module which automatically monitors the operation faults is connected with the input end of the interrupter protective device of the grounding fault circuit; the input end of the circuit module which automatically monitors the operation faults is connected with output end of the drive module; the main-control system can form a periodical clearance concussion pulse; the monitoring system forms an interlocking amplifier and a comparator.

The invention relates to a backup type UPS input switch abnormality detection device, comprising an input module; the input module is connected to a normally open contact of an input switch; a detection unit is connected to a normally closed contact of the input switch, and the common terminal of the input switch The contacts are connected to a switching module, the switching modules are respectively connected to an output module and a transformer, the transformer is connected to an AC input terminal of DC / AC, and the DC input terminal of DC / AC is connected to a backup battery; a control unit is respectively connected to To the output of the input module and to DC / AC. In the present invention, the detection unit detects whether the input switch is faulty when the mains power is cut off; the control unit controls the DC / AC to close after receiving the fault signal of the detection unit when the input switch fails, and ensures that the contacts are stuck when the relay or contactor fails. Under the condition of dead or control failure, it plays the role of backfeed protection to ensure that dangerous voltage will not be fed back to the input terminal, causing the risk of electric shock.

The invention discloses a removable lamp head switch, which relates to the field of LED technology. On the other surface of the lamp cap, two symmetrical movable contact pieces are also vertically installed on the other surface of the lamp cap; an inner tube is placed in the sleeve, and the outer wall of the inner tube has two symmetrical and along the inner tube. The grooves are opened in the direction, and the contacts of the two movable contact pieces are respectively in contact with the bottoms of the two grooves; the two grooves are provided with static contact pieces, and the two static contact pieces are both arranged on the bottom of the two grooves. The side of the contact point of the movable contact piece and the contact point of the groove close to the lamp head, the static contact piece and the contact point of the movable contact piece are not in contact. The structure of the present invention avoids the potential electric shock caused by the operator touching the pins during the installation process, and has high safety. The present invention has a simple structure, does not need manual testing, and reduces costs while improving production efficiency.

The invention discloses a socket comprising a casing. The casing is provided with jacks each matched with a pin of a plug, the jack is internally provided with a metal dome; the socket further comprises a lever, a support plate located below the jacks and a guide post fixed with the casing, the guide post is parallel to the length direction of the jacks, the support plate penetrates through via holes and is sleeved on the guide post via the via holes, the support plate is provided with protruding posts corresponding to the jacks one by one, the middle section of the lever is hinged with the casing, and the lower end of the lever is hinged with the support plate. The invention can eject the pin upwardly out of the jack conveniently, and no contact with the pin is generated in the process of unplugging.

The invention discloses a reach type safety buffer fork lift truck easy for replacement of an oil tank. The reach type safety buffer fork lift truck comprises an oil tank fixing structure, a door lock safety device, a reach buffer device and a connecting pin shaft structure. According to the reach type safety buffer fork lift truck disclosed by the invention, a fixing structure of the oil tank is more convenient and reasonable; during mounting, fasteners such as bolts and nuts are not needed; during dismounting, the oil tank can be quickly dismounted without using a tool, so that the mounting and dismounting time of the oil tank is greatly saved, and the maintenance and the repair of the oil tank are facilitated; and a power system of the reach type safety buffer fork lift truck can be automatically cut off when a truck lock is positioned in an opening state, so that unexpected conditions are prevented, the safety of operators is effectively guaranteed, the shake of a door frame in the moving process of the door frame can be reduced, and the safety of persons and goods is fully guaranteed. The reach type safety buffer fork lift truck is simple and practical in structure and is convenient in maintenance and reformation; a connecting shaft pin can be automatically and forcibly lubricated; wear resistance is higher, and the maintenance and the repair are realized more conveniently and quickly; the reach type safety buffer fork lift truck is long in service life and is not easy to damage, and facilitates the popularization and the application; and the maintenance and repair cost is effectively reduced.