JP2014235936A - External operation handle device of circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism for returning an operation handle to a position indicating ON, or a position indicating OFF, having a convenient and easy-to-assemble structure.SOLUTION: An external operation handle device of a circuit breaker includes one linear spring 41 having one end supported by a turn base support member 21, an ON-END engagement pin 22a projecting from a surface of a turn base 22 along the linear spring, and engaging with the linear spring when the turn base rotates together with the operation of the ON-END position of an operation handle 10, and an OFF-END engagement pin 8e engaging with the linear spring when the turn base rotates together with the operation of the OFF-END position of an operation handle 10. The linear spring acts as the spring reaction F1 for rotating the turn base to the ON position by engaging with the ON-END engagement pin, and acts as the spring reaction F2 for rotating the turn base to the OFF position by engaging with the OFF-END engagement pin.

Description

  The present invention relates to an external operation handle device for a circuit breaker that opens and closes a circuit breaker such as a circuit breaker housed in a box-type switchboard provided with an opening / closing door or a wiring breaker or an earth leakage breaker housed in a control panel. .

An external operation handle device for a circuit breaker includes a drive unit mounted on the front surface of a circuit breaker installed in a box-shaped panel having a single-opening type door and an operation unit mounted on the door. The shaft engaging part provided in the drive unit and the operation engaging part provided in the operation part are coupled when the open / close door is closed, and the circuit breaker can be opened and closed from the outside of the panel.
The drive unit includes a drive shaft, a turn base that includes a crank pin and rotates together with the drive shaft, a slide base that converts the rotary motion transmitted from the crank pin into a linear motion, and opens and closes the open / close lever of the circuit breaker. It has.
The operation unit includes an operation handle that is coupled to the drive shaft by coupling the shaft engagement unit and the operation engagement unit.

  FIG. 12A is a diagram showing the operation unit 31 of the external operation handle device in a plan view, and the operation handle 33 is rotatably arranged on the operation unit main body 32. The operation unit main body 32 has four displays of ON, TRIP, OFF, and OPEN / RESET. When the operation handle 33 stops at the position indicating ON, the rotation of the operation handle 33 is transmitted as a linear motion to the open / close lever through the turn base, crank pin, and slide base of the drive unit, so that the circuit breaker is energized. It becomes. Further, when the operation handle 33 stops at a position indicating OFF, the circuit breaker is in a cut-off state. Further, when the operation handle 33 stops at a position indicating TRIP, the circuit breaker maintains the TRIP state. When the operation handle 33 is rotated to the position indicated as OPEN / RESET, the circuit breaker that has maintained the TRIP state is cut off and the open / close door is opened.

By the way, when the circuit breaker in the TRIP state or the interrupted state (off state) is turned on by the operation of the external operation handle device, as shown in FIG. Is further rotated clockwise from the position indicated as ON (hereinafter, the position rotated clockwise is referred to as ON-END position). In this way, the operating handle 33 is rotated to the ON-END position, and the linear movement amount of the slide base that switches the open / close lever of the circuit breaker to the ON position is increased, so that the open / close lever is overstroked. Even if it changes due to wear or the like, the circuit breaker is surely turned on.
Then, the operation handle 33 rotated to the ON-END position is rotated counterclockwise by the operation handle return mechanism arranged in the drive unit, and stops at the position indicating ON as shown in FIG.

  Further, when the circuit breaker in the TRIP state or the on state is turned off by the operation of the external operation handle device, as shown in FIG. 13A, the operation handle 33 is further rotated counterclockwise from the OFF position. To the position indicated as OPEN / RESET. In this way, the operating handle 33 is rotated to the position indicated as OPEN / RESET, and the open / close lever is overstroked by increasing the linear movement amount of the slide base that switches the open / close lever of the circuit breaker to the OFF position. Even if it changes due to mechanical wear or the like, the circuit breaker is surely turned off.

Then, the operation handle 33 rotated to the position indicating OPEN / RESET is rotated clockwise by the operation handle return mechanism arranged in the drive unit, and stops at the position indicating OFF as shown in FIG. 13B. .
By the way, as an operation handle return mechanism for rotating the operation handle 33, for example, a mechanism using a coil spring described in Patent Document 1 can be considered.

  In the mechanism using the coil spring, a spring housing hole is formed in the operation portion main body 32 of the operation portion 31, a compression type coil spring is housed in the spring housing hole, and one end of the coil spring is engaged with the operation handle 33. In this mechanism, the spring restoring force of the coil spring is applied as a force that the operation handle 33 rotates.

Japanese Patent No. 4396370

However, the operation handle return mechanism using the coil spring described in Patent Document 1 described above forms a small spring accommodating hole in the operation portion main body 32, accommodates a small coil spring in the small spring accommodating hole, and operates the small coil spring. Since the handle 33 must be engaged, a lot of time is required for assembly.
Further, the operation handle 33 rotates counterclockwise (rotates counterclockwise from the ON-END position and stops at a position indicating ON), and rotates clockwise (rotates clockwise from the position indicating OPEN / RESET to OFF). Stop at the position shown. For this reason, when the operation handle return mechanism using the coil spring of Patent Document 1 is adopted, two types of operation handle return mechanisms for rotating the operation handle 33 counterclockwise and clockwise are required, and the cost increases due to an increase in the number of parts. May increase.

  Therefore, the present invention has been made in view of the above circumstances, and a mechanism using a spring for returning an operation handle to a position indicating ON or a position indicating OFF has an easily assembled structure and a simple structure. Thus, an object of the present invention is to provide an external operation handle device for a circuit breaker capable of reducing the manufacturing cost.

  An external operation handle device for a circuit breaker according to an aspect of the present invention includes a circuit breaker installed in a box-shaped panel having a door, a drive unit mounted on the front surface of the circuit breaker, and the door An external operation handle device for a circuit breaker that is mounted and has an operation handle for operating an open / close lever of the circuit breaker, and the operation portion is coupled to the drive unit when the open / close door is closed The operating handle is further turned from the ON position for operating the open / close lever to the ON state, the OFF position for operating the open / close lever to the OFF state, and the open / close lever to the ON state side. The ON-END position to be overstroke and the rotation in the reverse direction with respect to the ON-END position and further rotated from the OFF position The drive unit is turned to an OFF-END position where the stroke is overstroked to the off state side, and the drive unit transmits a turn base corresponding to the operation of the operation handle, and a turn base that rotatably supports the turn base. The drive unit includes a support member and a slide base that converts the rotary motion transmitted to the turn base into a linear motion and transmits the linear motion to the open / close lever, and the drive unit has one end side that supports the turn base. One elastically deformable linear spring supported by the member and arranged along the rotation direction of the turn base, and protruding from the surface of the turn base along the linear spring, When the turn base rotates with the operation of the ON-END position, it engages with the linear spring. An N-END engaging pin and a surface of the turn base along the linear spring at a position different from the ON-END engaging pin are provided to protrude from the turn base with the operation of the OFF-END position of the operation handle. And an OFF-END engaging pin that engages with the linear spring when rotating, and the linear spring rotates the turn base to the ON position by engaging with the ON-END engaging pin. A spring reaction force is applied, and a spring reaction force is applied to rotate the turn base to the OFF position by engagement with the OFF-END engagement pin.

  According to the external operation handle device of the circuit breaker according to one aspect of the present invention, the function of returning the operation handle from the ON-END position to the ON position, or returning from the OFF-END position to the OFF position is provided at one end of the turn base support member. This is a simple structure including a linear spring with a fixed side, an ON-END engagement pin and an OFF-END engagement pin protruding from the turn base, and the assembly can be greatly shortened. In addition, since the present invention uses a single linear spring, the manufacturing cost can be reduced.

Further, in the external operation handle device for a circuit breaker according to one aspect of the present invention, one of the ON-END engagement pin and the OFF-END engagement pin linearly rotates the turn base with respect to the slide base. In order to transmit it as a motion, it is preferable that the crank pin is provided so as to project at a position engaging with the slide base.
According to the external operation handle device for a circuit breaker according to one aspect of the present invention, as one of the ON-END engagement pin and the OFF-END engagement pin, it is transmitted to the open / close lever of the circuit breaker 4 as a linear motion. Since the parts are used together by using the crank pin that engages with the slide base, the manufacturing cost can be reduced.

Furthermore, in the external operation handle device for a circuit breaker according to an aspect of the present invention, the operation handle is coupled to a drive shaft that is coaxially fixed to the turn base, and the ON-END engagement pin and the The other of the OFF-END engaging pins protrudes from the surface of the turn base through a through hole formed in the turn base from the drive shaft in order to connect the turn base and the drive shaft coaxially. The positioning boss is preferable.
According to the external operation handle device of the circuit breaker according to the aspect of the present invention, the boss for positioning the drive shaft and the turn base is used as the other member of the ON-END engagement pin and the OFF-END engagement pin. Therefore, it is possible to further reduce the manufacturing cost by using the parts together.

  According to the external operation handle device of the circuit breaker according to the present invention, the structure in which the operation handle is returned from the ON-END position to the ON position or from the OFF-END position to the OFF position is fixed at one end to the turn base support member. Since it is a simple structure provided with the formed linear spring, the ON-END engagement pin and the OFF-END engagement pin protruding from the turn base, the assembly is easy and the manufacturing cost can be reduced.

It is a figure which shows the state in which the open / close door of the external operation handle apparatus of the circuit breaker which concerns on this invention is open. It is a disassembled perspective view of the member which comprises the external operation handle apparatus of the circuit breaker which concerns on this invention. It is sectional drawing which shows the state which has closed the door of the external operation handle apparatus of the circuit breaker which concerns on this invention. (A) shows the operation part of ON-END position of 1st Embodiment which concerns on this invention, (b), (c) is a figure which shows the principal part of the drive unit of ON-END position of 1st Embodiment. is there. (A) shows the operation part of ON position of 1st Embodiment which concerns on this invention, (b), (c) is a figure which shows the principal part of the drive unit of ON position of 1st Embodiment. (A) shows the operation part of the OFF-END position of 1st Embodiment which concerns on this invention, (b), (c) is a figure which shows the principal part of the drive unit of OFF-END position of 1st Embodiment. is there. (A) shows the operation part of the OFF position of 1st Embodiment which concerns on this invention, (b), (c) is a figure which shows the principal part of the drive unit of the OFF position of 1st Embodiment. (A) shows the operation part of ON-END position of 2nd Embodiment which concerns on this invention, (b), (c) is a figure which shows the principal part of the drive unit of ON-END position of 2nd Embodiment. is there. (A) shows the operation part of ON position of 2nd Embodiment which concerns on this invention, (b), (c) is a figure which shows the principal part of the drive unit of ON position of 2nd Embodiment. (A) shows the operation part of the OFF-END position of 2nd Embodiment which concerns on this invention, (b), (c) is a figure which shows the principal part of the drive unit of OFF-END position of 2nd Embodiment. is there. (A) shows the operation part of the OFF position of 2nd Embodiment which concerns on this invention, (b), (c) is a figure which shows the principal part of the drive unit of OFF position of 2nd Embodiment. (A) shows the operation unit at the ON-END position, and (b) is a diagram showing the operation unit operated at the ON position. (A) shows the operation unit at the OFF-END position, and (b) shows the operation unit operated at the OFF position.

DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.
1 is a diagram showing an outline of an external operation handle device of a circuit breaker according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the external operation handle device, and FIG. 3 is a sectional view of the external operation handle device. It is.
As shown in FIG. 1, the external operation handle device of the present embodiment has a circuit breaker 4 installed on a device mounting plate 3 inside a box-shaped panel 2 having a single-opening type opening / closing door 6 on the front surface. A drive unit 5 having a drive shaft 8 protruding is mounted on the front surface of the circuit breaker 4, and an operation unit 7 having an operation handle 10 for operating the circuit breaker 4 is installed on the opening / closing door 6. When closed, the engagement protrusion 8a formed at the tip of the drive shaft 8 and the engagement hole 12a (see FIG. 3) formed in the operation portion 7 are coupled.

As shown in FIG. 2, the operation unit 7 includes an operation handle 10, a handle cover 11, a shaft coupling member 12, a lock lever 13, a release lever 14, a lever holding plate 15, a packing 16, and a handle base 17.
As shown in FIG. 3, the operation unit 7 has a shaft coupling member 12 mounted in a shaft fitting hole provided at a lower portion of the operation handle 10 so as not to rotate relative to the shaft coupling member 12. An engaging hole 12a is formed in which the engaging protrusion 8a is inserted and engaged.

  The lock lever 13 and the release lever 14 are accommodated between the handle cover 11 and the handle base 17 while being supported by the lever holding plate 15. The lock lever 13 prevents the opening / closing door 6 of the switchboard or the control panel from being opened. The lock lever 13 engages with the engagement protrusion 8a of the drive shaft 8 to make the opening / closing door 6 unopenable. The release lever 14 releases the engagement of the lock lever 13 with the engagement protrusion 8a of the drive shaft 8.

As shown in FIG. 2, the drive unit 5 includes a drive cover 20, an intermediate cover 21, a turn base 22, a slide base 23, a detection lever 24, a detection lever pin 25, a turn base fixing screw 26, a mounting plate 27, and a mounting leg 28. It is a member.
Further, as shown in FIG. 4A, the handle cover 11 is displayed with ON, OFF, TRIP, and OPEN / RESET according to the rotation position of the operation handle 10.

In this drive unit 5, as shown in FIG. 3, a turn base 22 is coaxially fixed to a base portion 8b of the drive shaft 8 via a turn base fixing screw 26, and the drive shaft 8 and the turn base 22 are intermediate. The cover 21 is rotatably supported.
Further, as shown in FIG. 3, the slide base 23 is engaged with the open / close lever 4 a of the circuit breaker 4 while being supported by the mounting plate 27. The slide base 23 is arranged so as to be linearly movable in the direction in which the open / close lever 4a moves to the on position or the off position.

Further, a crank pin 22 a protruding downward is provided on the lower surface of the turn base 22 (see FIG. 2), and the crank pin 22 a is engaged with the slide base 23. When the turn base 22 rotates, the rotational motion of the turn base 22 is transmitted as a linear motion to the slide base 23 via the crank pin 22a.
Next, FIGS. 4 to 7 show the operation handle 10, the drive unit 5, and the operation handle return mechanism 40 of the first embodiment.

That is, FIG. 4A shows a state in which the operation handle 10 is further rotated clockwise from the position indicated as ON (hereinafter referred to as a state in which the operation handle 10 is rotated to the ON-END position). 4 (b) and 4 (c) show the structure of the back side of the drive unit 5, and show the operating handle return mechanism 40 in the state of FIG. 4 (a).
5A shows a state in which the operation handle 10 has been rotated from the ON-END position to a position indicating ON, and FIGS. 5B and 5C show the operation in the state of FIG. 5A. A handle return mechanism 40 is shown.

6A shows a state in which the operation handle 10 is further rotated counterclockwise from the position indicated as OFF to the position indicated as OPEN / RESET (hereinafter, the operation handle 10 is rotated to the OFF-END position). 6 (b) and 6 (c) show the operation handle return mechanism 40 in the state of FIG. 6 (a).
Further, FIG. 7A shows a state where the operation handle 10 is stopped at a position indicating OFF, and FIGS. 7B and 7C show the operation handle return mechanism 40 in the state of FIG. 7A. Is shown.

Next, the structure of the operation handle return mechanism 40 of the first embodiment will be described with reference to FIGS. 4 (b) and 4 (c).
The turn base 22 is fixed to the base portion 8 b of the drive shaft 8 via a turn base fixing screw 26. In addition, a crank pin 22a protrudes downward from the lower surface of the turn base 22 (see also FIG. 2), and four boss through holes 22b are formed on a concentric circle with the rotation center of the turn base 22 as the center. Has been.

Also, four positioning bosses 8c to 8f that fit into the four boss through holes 22b of the turn base 22 protrude from the lower surface of the base 8b of the drive shaft 8.
Among these four bosses 8c to 8f, one boss 8c positioned substantially opposite to the crank pin 22a with the turn base fixing screw 26 interposed therebetween is compared with the other three bosses 8d to 8f. Thus, the protrusion amount from the lower surface of the base portion 8b is large, and as shown in FIG. 4C, the protrusion portion 8 protrudes further from the lower surface of the turn base 22 after being fitted into the boss through hole 22b.
Here, the crank pin 22a is referred to as an ON-END engagement pin 22a, and the boss 8c in which the protrusion amount from the lower surface of the base portion 8b is increased is referred to as an OFF-END engagement pin 8c.

  A linear spring 41 having elasticity is fixed to the intermediate cover 21. The linear spring 41 includes a first straight portion 41a, a first arc portion 41b continuous from the first straight portion 41a, and a substantially parallel portion with respect to the first straight portion 41a continuously from the first arc portion 41b. A second straight line portion 41c that extends, a second circular arc portion 41d that is continuous from the second straight line portion 41c and protrudes in the opposite direction to the direction in which the first circular arc portion 41b protrudes, and the second circular arc portion 41d. And a third straight line portion 41e extending substantially parallel to the second straight line portion 41c.

The linear spring 41 is inserted into and engaged with an engaging recess 21 e formed in the intermediate cover 21 by the first straight portion 41 a, and the first arc portion 41 b is fixed to a fixing screw 42 screwed into the intermediate cover 21. The second straight part 41 c, the second arc part 41 d, and the third straight part 41 e are arranged along the lower surface of the turn base 22. When the ON-END engaging pin 22a and the OFF-END engaging pin 8c protruding from the lower surface of the turn base 22 are engaged with the third linear portion 41e by the rotation of the turn base 22, the linear spring 41 is elastic. It is designed to deform.
Further, the intermediate cover 21 is formed with a first stopper 21b and a second stopper 21c at a position across the direction in which the third linear portion 41e moves.

Next, operation | movement of the external operation handle apparatus of the circuit breaker of this embodiment is demonstrated.
First, when the circuit breaker 4 in the TRIP state or in the cut-off state (off state) is energized (on state) by operating the external operation handle device, as shown in FIG. 10 is rotated clockwise to the ON-END position.
When the operating handle 10 is rotated to the ON-END position, the linear movement amount of the slide base 23 that switches the open / close lever 4a of the circuit breaker 4 to the ON position increases, and the open / close lever 4a is overstroked. Even if it changes due to wear or the like, the circuit breaker 4 can be reliably turned on.

  When the operation handle 10 is rotated to the ON-END position, the turn base 22 rotates counterclockwise as shown in FIGS. 4B and 4C together with the rotation operation handle 10. The END engaging pin (crank pin) 22a engages with the third linear portion 41e, and the linear spring 41 is elastically deformed. Then, as shown in FIG. 4B, the linear spring 41 that is elastically deformed by engaging with the ON-END engaging pin 22a is formed with respect to the turn base 22 in FIGS. The counterclockwise reaction force F1 shown in FIG.

  Then, the turn base 22 in which the reaction force F1 of the linear spring 41 is acting on the ON-END engaging pin 22a rotates clockwise in FIGS. 5 (b) and 5 (c). Then, the third linear portion 41e of the linear spring 41 that has returned elastically engages with the second stopper 21c of the intermediate cover 21, whereby the reaction force F1 from the third linear portion 41e against the ON-END engaging pin 22a. The operation handle 10 rotates counterclockwise as shown in FIG. 5A and stops at a position indicating ON.

Further, when the circuit breaker in the TRIP state or the on state is brought into the cut-off state (off) state by operating the external operation handle device, as shown in FIG. 6A, the operation handle 10 is moved from the OFF position. Further, it is rotated counterclockwise to the OFF-END position.
When the operating handle 10 is rotated to the OFF-END position, the amount of linear movement of the slide base 23 that switches the open / close lever 4a of the circuit breaker 4 to the OFF position increases, the open / close lever 4a is overstroked, and the OFF position is mechanically Even if it changes due to wear or the like, the circuit breaker 4 can be reliably turned off.

  When the operation handle 10 is rotated to the OFF-END position, the turn base 22 is rotated clockwise as shown in FIGS. 6B and 6C together with the rotation operation handle 10, and the turn base 22 is rotated to turn OFF-END. The engagement pin (boss) 8c engages with the third linear portion 41e, and the linear spring 41 is elastically deformed. At this time, the third linear portion 41e moves until it engages with the first stopper 21b of the intermediate cover 21. The linear spring 41 that is elastically deformed by being engaged with the OFF-END engaging pin 8c is counterclockwise as shown in FIGS. 6B and 6C. Act.

  Then, the turn base 22 in which the reaction force F2 of the linear spring 41 is acting on the OFF-END engagement pin 8c rotates counterclockwise in FIGS. 7B and 7C. Then, the third linear portion 41e of the linear spring 41 that has returned elastically engages with the second stopper 21c of the intermediate cover 21, whereby the reaction force F2 from the third linear portion 41e against the OFF-END engaging pin 8c. Then, the operation handle 10 rotates clockwise as shown in FIG. 7A and stops at a position indicating OFF.

Next, the function and effect of the external operation handle device provided with the operation handle return mechanism 40 of this embodiment will be described.
The operation handle return mechanism 40 constituting the external operation handle device of this embodiment includes a linear spring 41 having one end fixed to the intermediate cover 21, and ON-END engagement pins 22 a and OFF protruding from the lower surface of the turn base 22. The assembly is completed simply by fixing the linear spring 41 having a simple structure to the intermediate cover 21 with the END engaging pin 8c, so that a small spring accommodating hole is formed, and a small coil spring is formed in the small spring accommodating hole. Compared with a conventional operation handle return mechanism that requires much time for storage and assembly, assembly can be greatly shortened.

  Further, in the operation handle return mechanism 40 of the present embodiment, when the operation handle 10 is rotated to the ON-END position, the turn base 22 is rotated together with the operation handle 10 so that the ON-END engagement pin 22a is linear. When the linear spring 41 is engaged with the spring 41 and generates an elastic reaction force F1 against the turn base 22, the operating handle 10 returns to a position indicating ON, while the operating handle 10 is turned OFF-END. When the turn base 22 is rotated to the position, the turn base 22 rotates to the operation handle 10 in the direction opposite to that when the overstroke is made to the ON-END position described above, so that the OFF-END engagement pin 8c is engaged with the linear spring 41. The linear spring 41 generates an elastic reaction force F2 against the turn base 22 so that the operation handle 10 returns to a position indicating OFF. It has a structure. In this way, the turn base 22 is provided with the ON-END engaging pin 22a that uses the single linear spring 41 and engages the linear spring 41 when the operation handle 10 is rotated to the ON-END position. Since the turn base 22 is provided with an OFF-END engagement pin 8c that engages with the linear spring 41 when the operation handle 10 is rotated to the OFF-END position, an increase in the number of parts is suppressed. It is possible to provide the operation handle return mechanism 40 that is reduced.

Further, as the ON-END engagement pin 22a constituting the operation handle return mechanism 40 of the present embodiment, a crank pin 22a engaged with the slide base 23 for transmitting as a linear motion to the open / close lever 4a of the circuit breaker 4 is provided. Since the parts are used in combination, the manufacturing cost can be reduced.
Further, the OFF-END engagement pin 8c constituting the operation handle return mechanism 40 of this embodiment is also one of a plurality of positioning bosses protruding from the lower surface of the base portion 8b of the drive shaft 8, and the OFF-END Since the engaging pin 8c also uses parts together, the manufacturing cost can be further reduced.

Next, FIGS. 8 to 11 show an operation handle return mechanism 50 according to a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same component as the structure shown in FIGS. 1-7, and the description is abbreviate | omitted.
FIG. 8A shows a state in which the operation handle 10 is rotated to the ON-END position, and FIGS. 8B and 8C show the operation handle return mechanism 50 in the state of FIG. 8A. Yes. FIG. 9A shows a state in which the operation handle 10 is rotated from the ON-END position to a position indicating ON, and FIGS. 9B and 9C show the operation in the state of FIG. 9A. A handle return mechanism 50 is shown. 10A shows a state where the operation handle 10 is rotated to the OFF-END position, and FIGS. 10B and 10C show the operation handle return mechanism 50 in the state of FIG. 10A. Show. Further, FIG. 11A shows a state where the operating handle 10 is stopped at a position indicating OFF, and FIGS. 11B and 11C show the operating handle return mechanism 50 in the state shown in FIG. Is shown.

As shown in FIGS. 8B and 8C, the operation handle return mechanism 50 of the present embodiment protrudes from the lower surface of the turn base 22 and the linear spring 51 having elasticity with one end fixed to the intermediate cover 21. An ON-END engaging pin 22a and an OFF-END engaging pin 8c.
The turn base 22 is fixed to the base portion 8b of the drive shaft 8 via a turn base fixing screw 26 as in the first embodiment. In addition, a crank pin 22a protrudes downward from the lower surface of the turn base 22 (see also FIG. 2), and four boss through holes (not shown) are formed on a concentric circle centered on the rotation center of the turn base 22. ) Is formed. Further, on the lower surface of the base portion 8b of the drive shaft 8, four positioning bosses 8c to 8f that fit into four boss through holes (not shown) of the turn base 22 are formed to protrude.

Of these four bosses 8c to 8f, one boss 8c located on the substantially opposite side to the crank pin 22a with the turn base fixing screw 26 interposed therebetween is the other three bosses 8d to 8f. In comparison, the protruding amount from the lower surface of the base portion 8b is large, and the protruding portion protrudes from the lower surface of the turn base 22 as shown in FIG.
Also in this embodiment, the crank pin 22a is referred to as an ON-END engagement pin 22a, and the boss 8c whose amount of protrusion is increased from the lower surface of the base portion 8b in this embodiment is referred to as an OFF-END engagement pin 8c. Yes.

  Further, the linear spring 51 of the present embodiment includes a first straight part 51a, a first arc part 51b continuous from the first straight part 51a, and a first straight part 51a continuous from the first arc part 51b. The second straight line portion 51c extending in a V shape, the second arc portion 51d continuous from the second straight portion 51c, and the third straight portion continuous from the second arc portion 51d 51e, a third arc portion 51f continuous from the third linear portion 51e, and a fourth linear portion extending in a V shape with respect to the third linear portion 51e continuously from the third arc portion 51f. 51g.

  The linear spring 51 is fixed to a fixing screw 52 in which the first straight portion 51a abuts against the wall of the intermediate cover 21 and the first arc portion 51b is screwed into the intermediate cover 21, and the second straight portion 51c, The third straight portion 51e, the third arc portion 51f, and the fourth straight portion 51g are arranged along the lower surface of the turn base 22. When the turn base 22 rotates, the ON-END engagement pin 22a and the OFF-END engagement pin 8c protruding from the lower surface of the turn base 22 are engaged with the second straight portion 51c and the third straight portion 51e. The linear spring 51 is elastically deformed.

Next, the operation of the operation handle return mechanism 50 of the second embodiment will be described.
First, when the circuit breaker 4 in the TRIP state or the interrupted state (off state) is energized (on state) by operating the external operation handle device, as shown in FIG. 10 is rotated clockwise to the ON-END position.
When the operation handle 10 rotates to the ON-END position, the turn base 22 rotates counterclockwise as shown in FIGS. 8B and 8C together with the rotation operation handle 10. The combination pin (crank pin) 22a engages with the third linear portion 51e, and the linear spring 51 is elastically deformed. Then, as shown in FIG. 8B, the linear spring 51 that is elastically deformed by being engaged with the ON-END engaging pin 22a is formed with respect to the turn base 22 in FIGS. The counterclockwise reaction force F3 shown in FIG.

  Then, the turn base 22 in which the reaction force F3 of the linear spring 51 is acting on the ON-END engaging pin 22a rotates clockwise in FIGS. 9B and 9C. Then, the tip of the fourth linear portion 51g of the linear spring 51 that has returned elastically engages with a stopper wall 21d formed on the intermediate cover 21, so that the third linear portion 51e with respect to the ON-END engaging pin 22a is engaged. The action of the reaction force F3 stops, and the operation handle 10 rotates counterclockwise as shown in FIG. 9A and stops at a position indicating ON.

Further, when the circuit breaker in the TRIP state or the on state is brought into the cut-off state (off) state by the operation of the external operation handle device, the operation handle 10 is moved from the OFF position as shown in FIG. Further, it is rotated counterclockwise to the OFF-END position.
When the operation handle 10 overstrokes to the OFF-END position, the turn base 22 rotates together with the rotation operation handle 10 in the clockwise direction shown in FIGS. 10B and 10C, and the rotation of the turn base 22 causes the OFF-END engagement. The joint pin 8c engages with the second linear portion 51c, and the linear spring 51 is elastically deformed. Then, the linear spring 51 that is elastically deformed by being engaged with the OFF-END engaging pin 8c acts on the turn base 22 in the counterclockwise reaction force F4 shown in FIGS. Act.

  Then, the turn base 22 in which the reaction force F4 of the linear spring 51 is acting on the OFF-END engaging pin 8c rotates counterclockwise in FIGS. 11B and 11C. Then, the tip of the fourth linear portion 51g of the linear spring 51 that has returned elastically engages with the stopper wall 21d of the intermediate cover 21, so that the reaction force from the second linear portion 51c against the OFF-END engaging pin 8c. The operation of F4 is stopped, and the operation handle 10 rotates clockwise as shown in FIG. 11A and stops at a position indicating OFF.

  The operation handle return mechanism 50 according to the present embodiment includes a linear spring 51 whose one end is fixed to the intermediate cover 21, and an ON-END engagement pin 22 a and an OFF-END engagement pin 8 c that protrude from the lower surface of the turn base 22. Since the assembly is completed simply by fixing the linear spring 51 having a simple structure to the intermediate cover 21, as with the operation handle return mechanism 40 of the first embodiment, the assembly efficiency can be greatly reduced. .

  Further, the operation handle return mechanism 50 according to the present embodiment uses a single linear spring 51 and engages the linear spring 51 when the operation handle 10 rotates to the ON-END position. The pin 22a is provided on the turn base 22 and the turn base 22 is provided with an OFF-END engaging pin 8c that engages the linear spring 51 when the operation handle 10 is rotated to the OFF-END position. Therefore, it is possible to provide the operation handle return mechanism 50 that reduces the manufacturing cost.

2 ... board, 3 ... equipment mounting plate, 4 ... circuit breaker, 4a ... opening / closing lever, 5 ... drive unit, 6 ... opening / closing door, 7 ... operating unit, 8 ... drive shaft, 8a ... engagement protrusion, 8b ... base, 8c ... boss (OFF-END engaging pin), 8d-8f ... boss, 10 ... operation handle, 11 ... handle cover, 12 ... shaft coupling member, 12a ... engagement hole, 13 ... lock lever, 14 ... release lever, DESCRIPTION OF SYMBOLS 15 ... Lever holding plate, 16 ... Packing, 17 ... Handle base, 20 ... Drive cover, 21 ... Intermediate cover (turn base support member), 21a ... Engaging recess, 22 ... Turn base, 22a ... Crank pin (ON-END) Engagement pin), 22b ... boss through hole (through hole), 23 ... slide base, 24 ... detection lever, 25 ... detection lever pin, 26 ... turn base fixing screw, 27 ... mounting plate, 28 Mounting legs, 40, 50 ... operation handle return mechanism, 41, 51 ... linear spring, 41a ... first straight part, 41b ... first arc part, 41c ... second straight part, 41d ... second arc part, 41e ... 3rd linear part, 51a ... 1st linear part, 51b ... 1st circular arc part, 51c ... 2nd linear part, 51d ... 2nd circular arc part, 51e ... 3rd linear part, 51f ... 3rd circular arc part, 51g ... 1st 4 straight sections

Claims (3)

A circuit breaker installed in a box-shaped panel having an open / close door, a drive unit mounted on the front of the circuit breaker, and an operation handle mounted on the open / close door and operating an open / close lever of the circuit breaker An external operation handle device for a circuit breaker in which the operation unit is coupled to the drive unit when the door is closed,
The operation handle includes an ON position for operating the opening / closing lever to an ON state, an OFF position for operating the opening / closing lever to an OFF state, and further rotating from the ON position to overstroke the opening / closing lever to the ON state side. The ON-END position to be rotated and the OFF-END position to rotate in the reverse direction with respect to the ON-END position and further rotate from the OFF position to overstroke the open / close lever. Move
The drive unit converts a turn base that transmits rotation corresponding to the operation of the operation handle, a turn base support member that rotatably supports the turn base, and converts the rotational motion transmitted to the turn base into a linear motion. And a slide base that transmits this linear motion to the open / close lever, and
One end side of the drive unit is supported by the turn base support member, and is arranged along the rotation direction of the turn base.
An ON-END engagement that is provided so as to protrude from the surface of the turn base along the linear spring and engages the linear spring when the turn base rotates with the operation of the ON-END position of the operation handle. idea,
The line is provided so as to protrude from the surface of the turn base along the linear spring at a position different from the ON-END engaging pin, and when the turn base rotates together with the operation of the OFF-END position of the operation handle. An OFF-END engaging pin that engages with a spring,
The linear spring exerts a spring reaction force that rotates the turn base to the ON position by engaging with the ON-END engaging pin, and the turn base by engaging with the OFF-END engaging pin. An external operation handle device for a circuit breaker, wherein a spring reaction force is applied to rotate the motor to the OFF position.   One of the ON-END engagement pin and the OFF-END engagement pin is provided to protrude to a position where the turn base engages with the slide base in order to transmit the rotational motion of the turn base to the slide base as a linear motion. The external operation handle device for a circuit breaker according to claim 1, wherein the handle pin is a crank pin. The operation handle is coupled to a drive shaft that is coaxially fixed to the turn base,
The other of the ON-END engagement pin and the OFF-END engagement pin passes through a through hole formed in the turn base from the drive shaft in order to connect the turn base and the drive shaft coaxially. 3. The external operation handle device for a circuit breaker according to claim 2, wherein the boss is a positioning boss protruding from the surface of the turn base.

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