JP6158604B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker, and more particularly to a circuit breaker that can be attached with an auxiliary device such as an alarm switch or an auxiliary switch.

  Conventionally, there is a circuit breaker in which an auxiliary device such as an alarm switch or an auxiliary switch can be attached. The case of such a circuit breaker is mounted on the case base with a case base for assembling a contact part for opening / closing the electric circuit, an opening / closing mechanism part for operating the contact part, an overcurrent detection part, and the like, and an accessory device storage part. In general, it is configured to include a case main body including a case lid body and a cover that closes the accessory device housing portion. An operation handle for opening and closing the contact portion is disposed adjacent to the cover or protruding from an opening provided in the cover, a power supply side terminal is disposed on the back of the case, and a load side terminal is disposed on the front. .

A circuit breaker having a cover as described above is configured to easily open and close the cover, while being required to be firmly closed so that the cover is not blown off by the pressure of arc gas generated during the breaking operation. The For this reason, a plurality of locking claws are provided on the cover, and after the cover is closed, a slide operation for locking the locking claws to the case lid is performed so that the cover is not released by the pressure of the arc gas.
For example, in Patent Document 1, after closing a cover provided with a plurality of locking claws, the cover's locking claws are slid in a direction to lock the case body by operating a quarter-turn screw provided on the cover. Thus, the locking claw was securely locked.

Special table 2011-507176 gazette

  However, in the case of the above-described configuration that requires an operation such as a slide operation after the cover is closed, the operator may assume that the cover is locked with the cover closed. However, even if a mechanism capable of forming a locked state was provided, it did not function effectively.

  Therefore, in view of such a problem, the present invention provides a circuit breaker that can form a state in which the locking claw provided on the cover is locked to the case body simply by rotating and closing the cover with respect to the case body. It is intended to provide.

In order to solve the above-mentioned problem, the invention of claim 1 is provided in order to house the accessory device in the upper part of the case body in which a shut-off mechanism for shutting off the electric circuit is housed in the case body, and an operation handle for operating opening and closing of the electric circuit is arranged. A circuit breaker having a recessed storage portion, a cover for closing the storage portion, a power-side terminal on the back of the case body, and a load-side terminal on the front surface. The storage portion can be opened and closed by a rotation operation, and has a plurality of locking claws that are locked to the case main body when closed. A plurality of locking recesses for stopping are provided, and a bearing portion provided on the case main body for suspending the cover is formed so that the hinge shaft of the cover can be guided in the front-rear direction of the case main body, and Case body Moves forward the hinged shaft the cover closing operation halfway in contact at a specific angle, the sliding means for inserting operate the locking claw to the locking recess is provided, further, the case body Has a guide part for moving the locking claw provided on the cover to a position where the locking claw can be locked to the locking recess, and the hinged side end of the cover to be closed is at the specific angle. Before reaching the guide part, the hinge shaft is moved to a predetermined position in the bearing part, the position of the locking claw with respect to the locking recess is corrected, and the cover that is closed is When the contact with the case body, the locking claw is locked in the locking recess, and the cover is fixed to the case body.
According to this configuration, the cover abuts against the case body at a specific angle during the cover closing operation and moves the hinge shaft forward, so that the locking claw can be inserted into the locking recess. Therefore, the cover can be fixed to the case body when the cover closing operation is completed. Therefore, it is not necessary to perform a cover fixing operation such as a slide operation after the cover is closed, and there is no fear of forgetting the locking operation.

Further, since the position of the locking claw is corrected to a position that can be locked to the locking recess during the cover closing operation, the cover can be closed without worrying about the position of the locking claw and the locking recess. .

  According to the present invention, the cover is brought into contact with the case body at a specific angle during the cover closing operation, the hinge shaft is moved forward, and the locking claw is inserted into the locking recess. When it is completed, the locking claw is inserted into the locking recess and the cover is locked. Therefore, when the cover is closed, the opening operation of the cover is prevented. After the cover is closed, an operation for locking the cover by a slide operation or the like can be eliminated, and there is no fear of forgetting the locking operation.

An example of the circuit breaker which concerns on this invention is shown, (a) is a top view, (b) is a left view. A cover single body is shown, (a) is a top view, (b) is a side view. It is the perspective view which looked at the cover from the lower part. It is a perspective view of a case lid. It is a top view of a case lid. It is a HH line sectional view. It is AA sectional view. It is a BB sectional view. It is DD sectional view taken on the line of the state which opened the cover. It is the DD sectional view taken on the line of the angle which a cover engages with a case main body. The state in the middle of closing a cover is shown, (a) is DD sectional view taken on the line, (b) is EE sectional view taken on the line. The state in the middle of closing a cover is shown, (a) is DD sectional view taken on the line, (b) is EE sectional view taken on the line. The state immediately before finishing the cover is shown, (a) is a sectional view taken along line DD, (b) is a sectional view taken along line EE, and (c) is a sectional view taken along line FF. The cover is shown closed, (a) is a sectional view taken along the line DD, (b) is a sectional view taken along the line EE, and (c) is a sectional view taken along the line FF. After the cover is closed, a state where the cover is completely locked is shown, (a) is a sectional view taken along the line DD, (b) is a sectional view taken along the line EE, and (c) is a sectional view taken along the line FF. It is movement explanatory drawing of the cover hinge axis | shaft by the DD sectional view. It is a top view which shows the other example of a circuit breaker. FIGS. 17A and 17B show a single cover of FIG. 17, and FIG. It is the perspective view which looked at the cover shown in FIG. 17 from the downward direction. It is a perspective view of the case cover body shown in FIG. It is sectional drawing of the circuit breaker of FIG. 17, (a) is JJ sectional view, (b) KK sectional drawing, (c) LL sectional drawing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example of a circuit breaker according to the present invention, where (a) is a plan view and (b) is a left side view. Reference numeral 1 denotes a power supply side terminal, 2 denotes a load side terminal, 3 denotes an operation handle for opening and closing an electric path between the power supply side terminal 1 and the load side terminal 2, 4 denotes a screw constituting the terminal, The load side terminal 2 is disposed on the opposite surface of the case 10, and the operation handle 3 is disposed on the upper surface of the case 10.
The case 10 includes a case main body 10a including a case base 11 in which an interrupting mechanism such as an overcurrent detection unit, an open / close contact, and an open / close mechanism is assembled, and a case cover 12 mounted on the case base 11, and a case cover 12 FIG. 1 shows a state in which the cover 13 is locked to the case main body 10a and further fixed with screws.
For convenience of explanation, the arrangement surface of the power supply side terminal 1 will be described below as the case back surface and the arrangement surface of the load side terminal 2 as the case front surface.

  2 and 3 show the cover 13 alone, FIG. 2 (a) is a plan view, FIG. 2 (b) is a side view, and FIG. 3 is a perspective view seen from below. 13a is an opening for exposing the operation handle 3 assembled to the case base 11, and 13b is a hinge shaft for hinged to the case lid 12, which protrudes from the left and right. The hinge shaft 13b is pivotally mounted in the vicinity of the load side terminal 2 of the case lid 12 so as to form a hinge portion, and the upper surface of the case lid 12 can be opened and closed by the rotation operation of the cover 13. Reference numeral 5 denotes a lid portion that closes the upper portion of the accessory device storage portion (shown in FIG. 4), and shows the case where the accessory device storage portion 6 is provided at two positions on the left and right of the operation handle 3.

  Reference numeral 14 (14 a to 14 c) shown in FIG. 3 denotes a locking claw that locks the case lid 12. Specifically, 14a is provided on the left and right sides of the open end, and is a first locking claw that locks in the vicinity of the power supply side terminal 1 when closed, and 14b includes an inclined surface provided in the vicinity of the hinge shaft 13b. A pair of second locking claws provided with locking portions, 14c are third locking claws extending in the left-right direction in the vicinity of the left and right hinge shafts 13b, 13b, and the locking claws 14 have five locations on the cover. Is formed.

  4 to 6 show the case lid 12, FIG. 4 is a perspective view, FIG. 5 is a plan view, and FIG. 6 is a cross-sectional view taken along line HH. In FIG. 4, 6 is an accessory storage part, 7 is a bearing part into which the hinge shaft 13b is inserted, 12a is an operation handle insertion hole, and 15 (15a to 15c) is a mechanism for locking the locking claw 14 of the cover 13. It is a stop recess. Specifically, 15a is formed at the left and right end portions in the vicinity of the power supply side terminal 1 and is locked in the first locking claw 14a, and 15b is formed in the vicinity of the load side terminal 2 and is locked in the second position. A pair of second locking recesses 15 c that the claw 14 b locks are third locking recesses that extend in the left-right direction between the left and right bearing portions 7 and are locked by the third locking claw 14 c. In addition, 12c shown in FIG. 6 is an engaging surface as a slide means mentioned later, and the engaging part 13d shown in FIG. 3 engages.

7 is a cross-sectional view taken along the line AA shown in FIG. 1, and FIG. 8 is a cross-sectional view taken along the line BB. As shown in FIG. 7, the open end portion of the cover 13 that closes the accessory device housing portion 6 is screwed to the case lid body 12 with screws 8, that is, screwed to the case main body 10 a and fixed thereto. In this state, the third locking claw 14c is locked to the third locking recess 15c, and the first locking claw 14a is locked to the first locking recess 15a as shown in FIG.
The second locking claw 14b is also locked to the second locking recess 15b as shown in FIG. Moreover, the partial enlarged view is added as needed after FIG.

In the circuit breaker configured as described above, the operation in which the locking claw 14 is locked to the locking recess 15 when the opened cover 13 is rotated and closed will be specifically described. 9 to 14 are sectional views of the circuit breaker showing the operation from the time when the cover 13 is rotated from the opened state until the cover 13 is brought into close contact with the case lid 12 to close the upper surface of the case body 10a. To explain.
The cover 13 is configured to be able to rotate about 180 degrees from a state (not shown) tilted forward of the case body 10a to a state where the case body 10a is closed (case cover 12 is closed). .

FIG. 9 is a cross-sectional view taken along the line DD shown in FIG. 1 and shows a state in which the turning and closing operation of the cover 13 is started and the engaging action between the cover 13 and the case lid 12 is started. When the cover 13 stands up and reaches an angle at which it begins to tilt backward, the hinge-side end 13c of the cover 13 engages with a step (guide) 12b formed on the case lid 12, and the cover 13 For a while until reaching a specific angle described later, the step portion 12b is rotated as a fulcrum. As a result, the hinge shaft 13b moves rearward of the bearing portion 7 (first state M1). The bearing portion 7 is formed long in the front-rear direction so that the hinge shaft 13b can be moved in the front-rear direction.
This step portion 12b acts as a guide means for guiding the locking claw 14 to a position where it can be inserted into the locking recess 15. The movement of the hinge shaft 13b causes the locking claw 14 provided on the cover 13 to move. Position correction with respect to the locking recess 15 provided in the case lid 12 is performed, and a smooth closing operation is possible.

  FIG. 10 is a sectional view taken along the line D-D at an angle at which the engagement operation with the case body 10a is started by proceeding with the turning and closing operation of the cover 13, and the relationship between the hinge-side end portion 13c and the stepped portion 12b. As a result of the combined action, the hinge shaft 13b is moved rearward (in the direction of the power supply side terminal) (second state M2).

  11 shows a state in which the cover 13 is further closed, (a) is a sectional view taken along the line DD, and (b) is a sectional view taken along the line EE. As shown in FIG. 11, when the cover 13 is rotated to approach the closed state, the butterfly shaft 13b further moves rearward and finally comes into contact with the rear end of the bearing portion 7 (third state M3). After the contact, the hinge shaft 13b becomes a fulcrum, and the hinge side end portion 13c of the cover 13 gets over the step portion 12b and starts moving forward. In addition, when the hinge shaft 13b comes into contact with the rear end of the bearing portion 7, as shown in FIG. 11A, the second locking claw 14b is disposed at a position facing the second locking recess 15b. Then, the locking operation is started by the subsequent closing operation.

FIGS. 12A and 12B show a state in which the closing operation of the cover 13 further proceeds and the cover 13 is rotated to a specific angle. FIG. 12A is a sectional view taken along the line DD, and FIG. 12B is a sectional view taken along the line EE. When the cover 13 is tilted rearward and reaches a specific angle, the engaging portion 13d formed on the lower surface of the cover 13 is moved from the inclined surface inclined forward of the case lid 12 as shown in FIG. It contacts the engaging surface (sliding means) 12c. Thereafter, when the closing operation is advanced, the cover 13 slides on the engagement surface 12c, and the entire cover 13 slides forward.
As a result, as shown in FIG. 12A, the second locking claw 14b enters the second locking recess 15b, and the locking operation starts (fourth state M4).

FIGS. 13A and 13B show a state immediately before the cover 13 comes into contact with the case lid 12, FIG. 13A is a sectional view taken along the line DD, FIG. 13B is a sectional view taken along the line EE, and FIG. FIG. As shown in FIG. 13 (a), by continuing the closing operation of the cover 13, the locking between the second locking claw 14b and the second locking recess 15b proceeds (fifth state M5).
At the same time, as the cover 13 slides forward and the hinge shaft 13b moves further forward, the engagement of the third locking claw 14c to the third locking recess 15c is newly established as shown in FIG. 13 (b). The stop begins. And as shown in FIG.13 (c), the 1st latching claw 14a approaches the 1st latching recessed part 15a.

  14A and 14B show a state where the cover 13 has been rotated and closed and is in contact with the case lid 12. FIG. 14A is a sectional view taken along line DD, FIG. 14B is a sectional view taken along line EE, and FIG. ) Is a cross-sectional view taken along line FF. As shown in FIG. 14A, when the cover 13 contacts the case lid 12, the second locking claw 14b enters deeply into the second locking recess 15b. In addition, as shown in FIG. 14B, the third locking claw 14c is locked in the third locking recess 15c. Further, as shown in FIG. 14C, the first locking claw 14a is locked to the first locking recess 15a (sixth state M6).

  FIGS. 15A and 15B show a state where the cover 13 in contact with the case lid 12 is screwed and fixed. FIG. 15A is a sectional view taken along the line DD, FIG. 15B is a sectional view taken along the line EE, and FIG. FIG. This is the same as the closed state shown in FIGS. The screw 13 is inserted into the screw insertion hole 13e of the cover 13 shown in FIG. 2 and screwed to the case lid 12 so that the cover 13 and the case lid 12 are in close contact with each other, and each locking claw 14 corresponds to each other. The locking recess 15 is securely locked (seventh state M7).

  FIG. 16 shows the flow of movement of the hinge shaft 13b in the series of operations for closing the cover 13, and shows the movement of the hinge shaft 13b from the first state M1 to the seventh state M7. From the first state M1 to the third state M3, the hinge shaft 13b moves backward, and then moves forward as shown in the fourth state M4 to the seventh state M7. By this movement, the locking claw 14 moves to a position where it can be easily locked in the locking recess 15 at the initial stage of the rotation closing operation. Thereafter, when the cover 13 is tilted to an angle at which locking is possible, the cover 13 moves forward in the opposite direction to perform locking operation.

Thus, since the cover 13 abuts against the case body 10a and moves the hinge shaft 13b forward at a specific angle during the closing operation of the cover 13, the locking claw 14 is inserted into the locking recess 15. Can do. Therefore, the cover 13 can be fixed to the case main body 10a when the closing operation of the cover 13 is completed. Accordingly, after the cover 13 is closed, there is no need to perform a cover 13 fixing operation such as a slide operation, and there is no fear of forgetting the locking operation.
Further, since the position of the locking claw 14 is corrected to a position that can be locked to the locking recess 15 during the closing operation of the cover 13, the position of the locking claw 14 and the locking recess 15 is not cared about. The cover 13 can be closed.

  The circuit breaker in which the accessory device storage 6 is provided at the two left and right positions of the operation handle 3 has been described above. However, the present invention can be easily applied to a circuit breaker in which only one accessory device storage 6 is provided. Applicable. FIGS. 17 to 21 show a circuit breaker provided with only one attachment device accommodating portion 6, FIG. 17 is a plan view of the circuit breaker, FIG. 18A is a plan view of the cover, and FIG. FIG. 19 is a perspective view of the cover as viewed from below, FIG. 20 is a perspective view of the case lid, and FIG. 21 is a sectional view of the circuit breaker. Hereinafter, a brief description will be given with reference to these drawings.

The case 10 includes a case base (not shown), a case lid 112, and a cover 113. As shown in FIG. 17, the accessory device storage 6 is provided at one place on the left side (downward in the drawing) of the operation handle 3. .
The cover 113 has a hinge shaft 113b that is hinged to the case lid 112 as shown in FIG. 18, and includes a plurality of locking claws 114 (114a to 114c) as shown in FIG. On the other hand, the case lid 112 is formed with locking recesses 115 (115a to 115c) for locking the locking claws 114 as shown in FIG. The circular boss 116 formed on the side surface is an engaging portion that engages with the case lid 112 and slides the cover forward, and corresponds to the engaging portion 13d.

21A is a cross-sectional view taken along the line JJ shown in FIG. 17, FIG. 21B is a cross-sectional view taken along the line KK, and FIG. 21C is a cross-sectional view taken along the line LL. Is shown. As shown in FIG. 21C, immediately before the cover 113 comes into contact with the case lid 112, the boss 116 provided on the cover 113 comes into contact with the engagement surface 112c formed on the case lid 112 so as to be inclined. 113 slides forward. In the same manner as in the above embodiment, the hinge shaft 113b moves to the rear of the bearing portion 7 during the period from the angle at which the cover 113 is raised to the angle shown in FIG. .
By the sliding operation of the cover 113, the individual locking claws 114 and the locking recesses 115 are locked, and when the cover 113 comes into contact with the case lid 112, the opening operation of the cover 113 is prohibited.
Thus, since the cover 113 is locked only by rotating and closing the cover 113 even with respect to the circuit breaker provided with only one attachment device storage portion 6, the cover 113 can be further slid after the cover 113 is closed. There is no need to lock 113, and there is no fear of forgetting to lock.

In the above embodiment, the case main body 10a is formed of two members, the case base 11 and the case lid 12, but may be formed of, for example, three members, and closes the formed auxiliary device storage section 6. The covers 13 and 113 may be arranged.
In addition, the configuration provided with two attachment device storage portions 6 is generally applied to MCCB (Molded Case Circuit Breaker), and the configuration provided with only one location is applied to ELB (Earth Leakage Breaker). It is a configuration.

  1 .. power supply side terminal 2.. Load side terminal 3 .. operation handle 6 .. accessory device storage part (storage part) 7 .. bearing part 10 .. case 10 a. ..Case base, 12 ..Case lid, 12 b ..Step part (guide part), 12 c ..engagement surface (sliding means), 13 ..cover, 13 b .. hinge shaft, 13 c. Side end part (convex part), 13d .. engaging part, 14 .. locking claw, 15 .. locking concave part, 112 .. case lid, 112 c .. engaging surface (sliding means), 113. Cover 113b ··· Hinged shaft 114 · · Locking claw 115 · · Locking recess.

Claims (1)

The case body is equipped with a shut-off mechanism that shuts off the electric circuit, and is provided with a recessed storage part for housing the accessory device at the upper part of the case main body in which an operation handle for operating the electric circuit is opened and closed. In a circuit breaker that has a cover to cover, a power supply side terminal on the back of the case body, and a load side terminal on the front,
The cover is hinged to the case main body and can open and close the storage portion by a turning operation, and has a plurality of locking claws that are locked to the case main body when the cover is closed. The main body is provided with a plurality of locking recesses for locking the locking claws,
A bearing portion provided on the case main body that hinges the cover is formed so that the hinge shaft of the cover can be guided in the front-rear direction of the case main body,
The case body is provided with slide means for causing the cover in the middle of the closing operation to abut at a specific angle to move the hinge shaft forward and to insert the locking claw into the locking recess,
Furthermore, the case main body has a guide part that moves the locking claw provided on the cover to a position where the locking claw can be locked to the locking recess,
The hinge side end portion of the cover to be closed is engaged with the guide portion before reaching the specific angle to move the hinge shaft to a predetermined position in the bearing portion. Position correction for the locking recess is made,
The circuit breaker, wherein when the closed cover comes into contact with the case body, the locking claw is locked in the locking recess and the cover is fixed to the case body.

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