US 2014/0231391 A1Published application

Switchgear operating mechanism and switchgear

AssigneeKabushiki Kaisha Toshiba

InventorsTadashi Iwasawa, Yoshikata Kobayashi, Satoshi Marushima, Masaharu Shimizu, Masahiro Nagao, Tatsuya Watanabe, Hirokazu Takagi, Yoshiaki Ohda

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Abstract

A switchgear and an operating mechanism thereof which stably maintain a spring force by a shutoff spring, and reduce an opening time. The operating mechanism includes a main lever that rotates upon receiving the spring force by a shutoff spring released in a transition to a shutoff condition to move a movable contact apart from an opposing contact, and the main lever is linked with a sub lever fixed to a sub shaft rotatable around its shaft. The sub shaft is fixed with a latch lever with a roller attached to the tip thereof. The latch lever is prevented from rotating by a latch present on a movement trajectory of the roller. A weight is pushed against the latch in a separable manner, and the weight is pushed by an actuator to allow the latch to rotate, thereby being retracted from the movement trajectory of the roller.

Claims16

Dependent claims

An operating mechanism for a switchgear, the operating mechanism causing a movable contact to contact an opposing contact or to separate therefrom to change a condition between a current shutoff condition and a loading condition, the operating mechanism comprising:

a shutoff spring that is released when the condition transitions from the loading condition to the shutoff condition;
a main lever that is supported pivotally has one end linked with the shutoff spring and has an other end linked with the movable contact, and rotates upon receiving spring force by the shutoff spring to move the movable contact apart from the opposing contact;
a sub lever that has one end linked with the main lever, and is rotatable around an other end;
a sub shaft that fixes the other end of the sub lever, and is rotatable around the shaft of the sub shaft;
a latch lever that has one end fixed to the sub shaft, has an other end attached with a roller, and is rotatable around the one end together with an axial rotation of the sub shaft;
a latch that is supported pivotally has an end present on a movement trajectory of the roller when in the loading condition to suppress a rotation of the latch lever;
a weight lever that is provided with, at one end thereof, a weight which is separable from the end of the latch;
a return spring that is attached to an other end of the weight lever, and pushes the weight against the end so as to position the end of the latch on the movement trajectory of the roller;
and
an actuator that pushes the weight to allow the latch to rotate, and to retract the latch from the movement trajectory of the roller.

7 more elements

A switchgear that changes a condition between a current shutoff condition and a loading condition, the switchgear comprising:

an opposing contact and a movable contact that are capable of contacting or separating relative to each other;
a shutoff spring that is released when the condition transitions from the loading condition to the shutoff condition;
a main lever that is supported pivotally has one end linked with the shutoff spring, has an other end linked with the movable contact, and rotates upon releasing of the shutoff spring to move the movable contact apart from the opposing contact;
a sub lever that has one end linked with the main lever, and is rotatable around an other end;
a sub shaft that fixes the other end of the sub lever, and is rotatable around the shaft of the sub shaft;
a latch lever that has one end fixed to the sub shaft, has an other end attached with a roller, and is rotatable around the one end together with an axial rotation of the sub shaft;
a latch that is supported pivotally has an end present on a movement trajectory of the roller when in the loading condition to suppress a rotation of the latch lever;
a weight lever that is provided with, at one end thereof, a weight which is separable from the end of the latch;
a return spring that is attached to an other end of the weight lever, and pushes the weight against the end so as to position the end of the latch on the movement trajectory of the roller;
and
an actuator that pushes the weight to allow the latch to rotate, and to retract the latch from the movement trajectory of the roller.

8 more elements

Dependencies are inferred from the claim text.