Energy-storing unit with forcing mechanism, and on-load tap changing device

Patent metadata

Field	Value
Publication number	US-9343244-B2
Application number	US-201214008206-A
Country	US
Kind code	B2
Filing date	Mar 28, 2012
Priority date	Mar 28, 2011
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

An energy-storing unit with a forcing mechanism and an on-load tap changing device provided with the same which employ an inexpensive and simple structure and which can suppress a loading torque to operate stably. A forcing mechanism built in an energy-storing unit includes a protrusion, a bearing, and a loading cam. Among those components, the protrusion is attached to the bottom face of an eccentric cam, and the bearing is attached to the tip of the protrusion. The loading cam is an isosceles triangle having a vertex that is substantially 90 degrees, and is attached to the top face of an energy-storing case. The loading cam becoming in contact with the bearing causes a crank to rotate through the energy-storing case, and feeds a catch to a standby position.

First claim

The invention claimed is:

1. An energy-storing unit forcing mechanism, the energy-storing unit comprising:
an eccentric cam linked with a drive shaft and moving in synchronization therewith;
a hoist case which is linked with the eccentric cam and which reciprocates linearly in synchronization with the eccentric cam;
a spring attached to the hoist case;
an energy-storing case which is linked with the hoist case through the spring and which reciprocates linearly in synchronization with the hoisting case;
a crank which is linked with the energy-storing case and which rotates in synchronization with the energy-storing case; and
a catch that is engaged with the crank at a predetermined standby position to lock a rotation of the crank and to compress the spring,
the forcing mechanism comprising:
a protrusion attached to the eccentric cam;
a bearing attached to a tip of the protrusion; and
a loading cam attached to the energy-storing case, the loading cam directly contacting with the bearing to rotate the crank through the energy-storing case, and move the catch to the standby position.

2. The energy-storing unit with the forcing mechanism according to claim 1 , wherein the loading cam has a cam shape that is an isosceles triangle.

3. An on-load tap changing device comprising the energy-storing unit with the forcing mechanism according to claim 1 .

4. An on-load tap changing device comprising the energy-storing unit with the forcing mechanism according to claim 2 .

Assignees

• Ishikawa Taku
• Eguchi Naoki
• Kakoki Osamu
• Toshiba Kk

Inventors

• Ishikawa Taku
• Eguchi Naoki
• Kakoki Osamu

Classifications

• H01H9/0027 Primary

  Operating mechanisms · CPC title

• H01H3/3015

  using cam devices · CPC title

• H01H3/3052

  Linear spring motors · CPC title

• H01F29/04

  having provision for tap-changing without interrupting the load current · CPC title