Kabushiki Kaisha Toshiba

Tokyo Shibaura Denki Kabushiki Kaisha

The Tokyo Electric Power Company, Incorporated

Yoshikata Kobayashi

Masaharu Shimizu

Yoshiaki Ohda

Satoshi Marushima

Hirokazu Takagi

Tooru Inoue

Tadashi Munakata

Yoshinobu Ishikawa

Satoshi Suzuki

Akio Kobayashi

Takeshi Takahara

Tsutomu Tanaka

Tatsuya Watanabe

Shinji Takahashi

Shin Murakami

Hiroshi Furuta

Sueyoshi Mizuno

Fumio Nakajima

Norihito Togashi

Yasuhiro Matsumoto

Hiroshi Matsui

Hideyuki Shimada

Katsune Zaitsu

Yoshihiko Nakada

Jun Sawada

Yukio Someya

Satoshi Irie

Masanori Sotodate

Nobuo Taguchi

A piston rod () and a first piston () are arranged in the interior of an external cylinder () and internal cylinder (); a second piston for absorbing the change of volume of operating fluid () is also arranged therein. Also, a first return spring () for returning the piston rod () to the interruption position is provided and a second return spring () for returning the operating fluidinto the high-pressure chamber () by pressurizing the second piston () is provided. In addition, the air in the interior of the buffering device () is withdrawn by a vacuum pump (), and operating fluid () is thus introduced in a degassed condition.

Buffering device for the operating mechanism of a switchgear, and method of lubrication thereof

A switchgear operating mechanism has: a ratchet wheel that rotates together with a closing shaft; a stop lever that enables contact between an energy storing cam and a roller; a motor that transmits power to a feed lever; a feed pawl; stop pawls that suppresses reverse rotation of the feed pawl; a closing lever that expands/contracts a closing spring; a catch mechanism for energy storage for the closing lever; a closing cam; a stopper unit that suppresses rotation of the stop lever; a first sprocket; second and third sprockets that are capable of rotating together with an intermediate shaft; a fourth sprocket rotatably fastened to an energy storing cam shaft; a first chain that engages with the first and second sprockets; and a second chain that engages with the third and fourth sprockets.

Switchgear and switchgear operating mechanism

The circuit opening operation section of an embodiment of switchgear operation mechanism comprises: a circuit opening electromagnetic solenoid having a fitting structure that is provided with a step; and a solenoid spacer for adjusting the distance between a circuit opening trigger mechanism and the circuit opening electromagnetic solenoid. The circuit opening solenoid has: a solenoid housing fixed in position by way of the solenoid spacer; a plunger; and a stopper fitted to the solenoid housing so as to limit the sliding motion of the plunger in the plunger returning direction when the coil is not supplied with electric power. The limiting position of the stopper is adjustable.

Switchgear and operation mechanism for the same

According to an embodiment, when a switchgear operating state is shifted from a close state to a cutoff state, a solenoid lever is pushed and rotated by a plunger of an electromagnetic solenoid for cutoff so that the solenoid lever rotates in a direction opposite from the direction of the urging of a solenoid-lever return spring. A trigger roller pin and the solenoid lever become disengaged from each other, an eccentric pin and a trigger lever are rotated by the urging force from a latch leading end become disengaged from each other, whereby a latch lever is rotated by the released energy of a cutoff spring.

An embodiment of a switchgear has: a closing shaft; a main lever fixed to the closing shaft and associated with a movable contact; a cutoff spring; a sub-shaft; a sub-lever and a latch lever which are connected to the sub-shaft; a roller pin mounted to the leading end of the latch lever; a latch; a latch returning spring for urging the latch; a latch pin fixed to the latch; and a ring mounted to the latch pin so as to be movable in the radial direction of the latch pin. In the closed state, the roller pin presses the leading end of the latch. In power cutoff operation, latch is pulled so as to permit rotation of the latch, engagement between the roller pin and the leading end of the latch is disengaged, and the sub-shaft is rotated by urging by the cutoff spring.

According to an embodiment, a switchgear operating mechanism has a roller pin rotatably fixed to a leading end of a latch lever. A latch is fixed to a solenoid lever at a position different from the rotation axis of the solenoid lever, and has a leading end engageable with the roller pin. In a state where the switchgear operating state is shifted from the closed state to the cutoff state, the solenoid lever is pushed by an electromagnetic solenoid for cutoff so as to be rotated in an opposite direction to the biasing direction of the solenoid lever return spring, and the latch lever is rotated by a biasing force of the roller pin to release an engagement between the roller pin and the leading end of the latch, which causes a cutoff spring to discharge its energy to rotate the latch lever.

The time period is shortened till a cutoff spring force is released when a switchgear is cut off. This switchgear comprises: a closing shaft; a main lever fixed turnably on the closing shaft and associated with a movable contact; a closing spring; a sub shaft; a sub lever and a latch lever fixed on the sub shaft; a roller mounted on the leading end of the latch lever; a turnable latch and a kick lever; a lock lever made turnable with respect to the latch; a latch returning spring for biasing the latch; a lock returning spring for biasing the kick lever and the lock lever; and a stopper for restricting the turns of the lock lever and the latch.

A switchgear operating mechanism for reciprocatively driving a movable contact of a switchgear so as to shift the switchgear between an open state and a closed state. In the closed state, a roller pushes a leading end of a latch in the direction substantially toward the rotation center of the latch. In a state where the switchgear operating state is shifted from the closed state to the open state, a lock lever is pulled so as to allow the latch to be rotated in the opposite direction to the biasing direction of a latch return spring to release an engagement between the roller and the leading end of the latch, which causes the opening spring to discharge its energy to rotate the sub-shaft.

The present invention provides a switchgear, which can achieve miniaturization and simplification while securing high operation reliability, and excellent in assembly, operability and inspection, and further, has a compact size. A fluid pressure operating section is provided in a mechanical box arranged on a lower end portion of a support porcelain tube. Insulated operating rods are received in the support porcelain tube, and connecting mechanisms are received in a container. Switching contacts of circuit breaker and disconnecting switches and the fluid pressure operating section are connected via the connecting mechanisms and the insulated operating rods.

Combined type fluid pressure driving apparatus

An apparatus for disassembling and assembling a gas turbine combustor comprises a hand assembly for holding a combustor component of a gas turbine, an inserting and drawing section which supports the hand assembly and moves the same in parallel to a central axis of the combustor component and a retainer for securing the inserting and drawing section onto a casing which constitutes an outer section of the gas turbine.

Apparatus and method for disassembling and assembling gas turbine

The inspection apparatus for inspecting performance of a structure such as stator windings of an electric rotating machine of the invention comprises a probe including a measuring element, an arm unit and a cylinder face circumferential moving apparatus. The arm unit has an arm link section supporting the probe (mainly comprising a leading end link assembly and an arm posture keeping mechanism), an arm housing section (mainly comprising a guide rail) regarding driving of this arm link section, and an arm driving mechanism. The arm driving mechanism causes the leading end link assembly to project from the guide rail at an angle toward a measuring position side of the stator windings relative to the axial direction of the rotor unit, while causing the arm link section to travel along the guide rail. The arm posture keeping mechanism is provided with a link wire and a spring, and maintains a straight arm posture of the leading end link assembly after projection from the guide rail.

Growing community of inventors

Tokyo, Japan

Yoshikata Kobayashi