A pneumatic hammer includes a piston in an operating cylinder; and a valve mounted at a rear end of the operating cylinder and including a front mechanism, a rear mechanism, and a disc. The rear mechanism includes two opposite inlets, a chamber member, outlets, a relief chamber communicating with the outlets, two opposite inlet channels disposed externally of the chamber member, and two first outlet tunnels disposed externally of the chamber member. The front mechanism includes a chamber element on one surface communicating with the inlet channels, an axial tunnel through a center of the chamber element, and two second outlet tunnels disposed externally of the chamber element. The disc is between the chamber member and the chamber element. The operating cylinder includes intermediate through holes and two inlet passageways having one ends communicating with the axial space and the other ends communicating with the second outlet tunnels.

A pneumatic hammer includes a piston in an operating cylinder; and a valve mounted at a rear end of the operating cylinder and including a front mechanism, a rear mechanism, and a disc. The rear mechanism includes two opposite inlets, a chamber member, outlets, a relief chamber communicating with the outlets, two opposite inlet channels disposed externally of the chamber member, and two first outlet tunnels disposed externally of the chamber member. The front mechanism includes a chamber element on one surface communicating with the inlet channels, an axial tunnel through a center of the chamber element, and two second outlet tunnels disposed externally of the chamber element. The disc is between the chamber member and the chamber element. The operating cylinder includes intermediate through holes and two inlet passageways having one ends communicating with the axial space and the other ends communicating with the second outlet tunnels.

The disclosure relates to an assembly for preloading a cable rotary-pendulum kinematic system, in which a rotational motion of a rotary body is converted into a translational motion of a winding body by winding cables, to which rotary body a torque may be applied. The assembly includes: a rotary body of a cable rotary-pendulum kinematic system, which rotary body is to be preloaded, may be rotated about the longitudinal axis thereof and is immovable in the direction of the longitudinal axis; at least one gas spring, which surrounds the rotary body and which may be compressed in the direction of the longitudinal axis; and primary cables, which force-lockingly connect the rotary body to the gas spring in such a way that a rotational motion of the rotary body causes compression of the gas spring, whereby the assembly is preloaded. The assembly has the advantage that no undesired oscillations occur in a cable rotary-pendulum kinematic system. The disclosure further relates to the use for electrical circuit breakers.

The disclosure relates to an assembly for preloading a cable rotary-pendulum kinematic system, in which a rotational motion of a rotary body is converted into a translational motion of a winding body by winding cables, to which rotary body a torque may be applied. The assembly includes: a rotary body of a cable rotary-pendulum kinematic system, which rotary body is to be preloaded, may be rotated about the longitudinal axis thereof and is immovable in the direction of the longitudinal axis; at least one gas spring, which surrounds the rotary body and which may be compressed in the direction of the longitudinal axis; and primary cables, which force-lockingly connect the rotary body to the gas spring in such a way that a rotational motion of the rotary body causes compression of the gas spring, whereby the assembly is preloaded. The assembly has the advantage that no undesired oscillations occur in a cable rotary-pendulum kinematic system. The disclosure further relates to the use for electrical circuit breakers.

An input control for controlling various features of an electronic device is described. The input control can be positioned along an exterior surface of the electronic device and cover an opening leading into the electronic device. A pressure sensor can then be positioned within the electronic device and adjacent to the covered opening. The pressure sensor is able to measure a pressure of a volume of air positioned between the pressure sensor and the input control. When movement of the input control changes the pressure of the volume of air, the sensor readings from the pressure sensor can be used to register a user input. The input control can take many forms including rocker buttons, slider switches and input regions.

An input control for controlling various features of an electronic device is described. The input control can be positioned along an exterior surface of the electronic device and cover an opening leading into the electronic device. A pressure sensor can then be positioned within the electronic device and adjacent to the covered opening. The pressure sensor is able to measure a pressure of a volume of air positioned between the pressure sensor and the input control. When movement of the input control changes the pressure of the volume of air, the sensor readings from the pressure sensor can be used to register a user input. The input control can take many forms including rocker buttons, slider switches and input regions.

Embodiments of the disclosure provide a current protection device for a fault current limiter, the current protection device including a detection circuit electrically coupled between a current transformer and a pneumatic timer, and an electrical vacuum interrupter (EVI) coupled to a pneumatic cylinder. In some embodiments, the EVI includes a set of breaker contacts, wherein the pneumatic timer is communicatively coupled with the pneumatic cylinder to actuate a moveable contact of the set of breaker contacts. In some embodiments, the detection circuit is configured to detect a current of the current transformer, and to provide a control signal to the pneumatic cylinder to open or close the set of breaker contacts based on the detected current.

A circuit breaker system having an electrical contact system, the electrical contact system includes one or more electrical contacts that are movable between a closed and an open position via a rechargeable spring loaded operating mechanism. An air motor recharging system includes an air motor operably coupled to the operating mechanism for recharging a closing spring. The air motor recharging system further comprises a solenoid valve that, when in an open position, supplies pressurized air to the air motor from a pressurized air storage tank at a preferred operating pressure sufficient to enable the air motor to drive a charging shaft and gear assembly to recharge a closing spring. The circuit breaker system further comprises an air compressor to delivers compressed air to the air storage tank to fill and maintain the storage tank at a preferred storage pressure.

A circuit breaker system having an electrical contact system, the electrical contact system includes one or more electrical contacts that are movable between a closed and an open position via a rechargeable spring loaded operating mechanism. An air motor recharging system includes an air motor operably coupled to the operating mechanism for recharging a closing spring. The air motor recharging system further comprises a solenoid valve that, when in an open position, supplies pressurized air to the air motor from a pressurized air storage tank at a preferred operating pressure sufficient to enable the air motor to drive a charging shaft and gear assembly to recharge a closing spring. The circuit breaker system further comprises an air compressor to delivers compressed air to the air storage tank to fill and maintain the storage tank at a preferred storage pressure.

A medium voltage circuit switch or breaker includes: at least one movable contact; a fixed contact; and a mechanical or magnetical drive system, which moves the at least one movable contact to a closed or opened position by a movement of a rod and/or a lever. The mechanical or magnetical drive system is linked to a switching generating signal. The mechanical or magnetical drive system includes at least one pyrotechnical actuator or gas generator. The pyrotechnical actuator or the gas generator is linkable to the switching generating signal of the mechanical or magnetical drive system.