JP5517902B2 - Circuit breaker crossbar and movable contact mounting structure - Google Patents

Description

  The present invention relates to a structure for attaching a movable contact of a circuit breaker to a crossbar.

  As shown in Patent Document 1, a multi-pole circuit breaker has a multi-pole fixed contact, a plurality of movable contacts that are detachably attached to the fixed contact, and an overcurrent flowed. A trip mechanism for peeling the movable contact from the fixed contact, and a handle capable of switching on and off the electric circuit of the plurality of fixed contacts and the movable contact. In this circuit breaker, when an overcurrent flows, the trip mechanism is activated, the contact of the movable contact is peeled off from the contact of the fixed contact, and the electric circuit between the movable contact and the fixed contact is opened. In addition to being shut off, the handle is positioned at the trip position, and the handle cannot be operated unless the handle is operated to the OFF position. In such a circuit breaker, as shown in FIG. 5, a plurality of movable contacts 52 are attached to a single crossbar 51, and the crossbar 51 is attached to a casing of the circuit breaker so as to be rotatable. In general, when the trip mechanism is activated, the movable contacts 53 of the plurality of movable contacts 52 are simultaneously peeled from the fixed contacts of the fixed contacts.

  In order to assemble the movable contact 52 to the cross bar 51, as shown in FIG. 6, a movable contact in which a shaft pin 55 and a winding spring 54 are attached to a holding hole 51a formed in parallel with the cross bar 51. This is done by inserting and holding the child 52. Below, the structure and attachment method of the conventional movable contact 52 and the cross bar 51 are demonstrated. 7 and 8, the right side of the drawing is the insertion side of the holding hole 51a, and the left side of the drawing is the outlet side of the holding hole 51a. As shown in FIGS. 6, 7 </ b> A, and 8 </ b> A, holding recesses 51 b are formed on both side surfaces of the holding hole 51 a. The holding recess 51b includes a bearing portion 51c that is recessed in a circular shape, and an introduction portion 51d that opens from the bearing portion 51c to the insertion side and opens. As shown in FIG. 7, the lower end edge of the introduction portion 51d is an introduction slope 51e that is gradually positioned on the lower side toward the insertion side of the holding hole 51a.

  A movable contact 53 is provided at the tip of the movable contact 52. A shaft pin 55 is attached to the base of the movable contact 52, and the shaft pin 55 protrudes from both side surfaces of the movable contact 52. A winding spring 54 is wound around the shaft pin 55. One end side of the winding spring 54 is an abutting portion 54a that extends from the shaft pin 55 to the movable contact 53 side and has a tip bent downward. The other end side of the winding spring 54 is a fixed portion 54 b extending from the shaft pin 55 to the proximal end side of the movable contact 52, and the fixed portion 54 b is hooked on the base of the movable contact 52 and fixed. Has been.

  In order to attach the movable contact 52 to the cross bar 51, first, as shown in FIG. 7B, the tip of the movable contact 52 is inserted from the insertion side of the holding hole 51a, and the movable contact 52 is moved. The tip is protruded from the outlet side of the holding hole 51a, and the shaft pin 55 is introduced into the introduction part 51d. In this state, as shown in FIG. 8B, the contact portion 54a contacts the ceiling surface 51f of the holding hole 51a, and the shaft pin 55 is pressed against the introduction slope 51e by the urging force of the winding spring 54. ing. In this state, further movement of the movable contact 52 in the outlet side direction is hindered. For this reason, in order to attach the movable contact 52 to the cross bar 51, the contact portion 54a of the winding spring 54 is deformed in the closing direction of the movable contact 52, and thereafter, only the movable contact 52 is moved in the outlet side direction. Must be moved (state shown in FIG. 7C). Then, as shown in FIG. 8D, when the bent portion of the contact portion 54a gets over the bent portion 51g of the ceiling surface 51f, the shaft pin 55 is pivotally supported by the bearing portion 51c, and the movable contactor 52 is attached to the cross bar 51 (state shown in FIG. 7D). In this state, the movable contact 52 can rotate around the bearing 51c.

JP 2007-265830 A

In order to attach the movable contact 52 to the cross bar 51, as described above, the contact portion 54a of the winding spring 54 is deformed in the closing direction of the movable contact 52, and the movable contact 52 is moved toward the outlet side. Although it is necessary to move, if the position of the shaft pin 55 on the introduction slope 51e is not appropriate, the movable contact 52 cannot be moved toward the outlet side while deforming the contact portion 54a. There was a problem that it was difficult to attach the child 52 to the cross bar 51.
An object of the present invention is to solve the above-described problem and provide a structure for mounting a crossbar and a movable contact of a circuit breaker that can easily attach the movable contact to the crossbar.

The invention according to claim 1, which has been made to solve the above problems,
A cross bar having a plurality of holding holes;
A movable contact provided with a movable contact at the tip;
A shaft pin protruding from both side surfaces of the movable contact;
It consists of a winding spring wound around the shaft pin,
In the mounting structure of the crossbar and the movable contact of the circuit breaker for attaching the movable contactor assembled with the shaft pin and the winding spring to the crossbar,
On both side surfaces of the holding hole of the cross bar, an introduction slope for guiding the shaft pin to the bearing portion of the cross bar is formed,
A step portion is formed on the introduction slope.

  According to a second aspect of the present invention, in the first aspect of the present invention, a positioning portion is formed at an inlet of the introduction slope.

  According to the present invention, since the step portion is formed on the introduction slope, the operator can easily position the shaft pin on the introduction slope to push the movable contact to the outlet side while pressing the contact portion of the winding spring. Since the movable contact and the winding spring are pushed in until the shaft pin comes into contact with the stepped portion, and only the movable contact is pushed in after the shaft pin is brought into contact with the stepped portion, Provided is a circuit breaker crossbar and movable contact mounting structure in which the workability of assembling the winding spring 54 and the movable contact 52 is improved and the movable contact can be easily mounted on the crossbar. Is possible.

It is a disassembled perspective view of the cross bar and movable contact of this invention. It is explanatory drawing which showed the installation procedure to the cross bar of the introduction slope of this invention, and a movable contactor. It is explanatory drawing which showed the installation procedure to the cross bar of the introduction slope of this invention, and a movable contactor. It is another example of a 1st position determination part and a 2nd position determination part. It is a perspective view in the state where a movable contact was attached to a crossbar. It is a disassembled perspective view of the conventional crossbar and a movable contact. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a structure for attaching the movable contact 52 to the cross bar 51, and FIG. 2 is a cross-sectional view showing a procedure for attaching the movable contact 52 to the introduction slope 51e and the cross bar 51. The cross bar 51 has holding holes 51a formed on the insertion side and the outlet side of the movable contact 52, and holding concave portions 51b are formed on both side surfaces of the holding hole 51a on the insertion side. The holding recess 51b includes a bearing portion 51c that is recessed in a circular shape, and an introduction portion 51d that opens from the bearing portion 51c to the insertion side and opens. The lower end edge of the introduction portion 51d is an introduction slope 51e that is gradually positioned on the lower side from the bearing portion 51c toward the insertion side of the holding hole 51a.

  The movable contact 52 is provided with a movable contact 53 at one end, and a hole formed so that the shaft pin 55 can be attached to the other end. The shaft pin 55 is attached to the hole, and the movable contact 55 Protrudes from both sides. A winding spring 54 is wound around the shaft pin 55. One end side of the winding spring 54 is an abutting portion 54a that extends from the shaft pin 55 to the movable contact 53 side and has a tip bent downward. The other end side of the winding spring 54 is a fixed portion 54 b extending from the shaft pin 55 to the proximal end side of the movable contact 52, and the fixed portion 54 b is hooked on the base of the movable contact 52 and fixed. Has been. Here, the winding spring 54 is provided to apply contact pressure to the fixed contact side when the cross bar 51 rotates and the movable contact 53 of the movable contactor 55 comes into contact with the fixed contact.

  The shaft pins 55 protruding from the both side surfaces of the movable contact 52 are introduced into the introduction slopes 51e of the holding recesses 51b formed on both side surfaces of the holding hole 51a of the cross bar 51, and the movable contact 52 is pushed in to form a circular shape. It is pivotally supported by the recessed bearing portion 51c. In addition, the introduction slope 51e has a positioning portion 51h as a step shape for allowing the operator to recognize the position of the shaft pin 55, and a step portion 51i is formed above the positioning portion 51h. By forming the step portion 51i on the introduction slope 51e, when the movable contact 52 is assembled, the shaft pin 55 comes into contact with the step portion 51i so that the operator can recognize the position of the shaft pin 55. The position and timing at which the winding spring 54 and the movable contact 52 are pressed can be recognized depending on the position, and the movable contact 52 can be easily attached to the cross bar 51.

  Hereinafter, a method for introducing the movable contact 52 into the bearing portion 51c of the cross bar 51 will be described. 2A to 2D correspond to FIGS. 3A to 3D, respectively. As shown in FIG. 2A, in the present invention, a positioning portion 51h and a step portion 51i are formed on the introduction slope 51e in order from the insertion side. In the present embodiment, as shown in FIG. 3A, on the insertion side of the positioning portion 51h and the stepped portion 51i, horizontal flat portions 51j and 51k in the figure are formed, respectively, and the positioning portion 51h and The step portion 51i has a step shape. As shown in FIG. 3A, the ceiling surface 51f of the holding hole 51a is a horizontal plane 51n up to the inflection point 51m that has entered a predetermined distance from the insertion side, but the exit side from the inflection point 51m is the exit side. It becomes the inclined surface 51p located upwards as it approaches the side. A bent portion 51g that bends upward toward the outlet side of the holding hole 51a is formed on the ceiling surface 51f of the outlet portion of the holding hole 51a.

  First, the tip of the movable contact 52 is inserted from the insertion side of the holding hole 51a of the cross bar 51 into the movable contact 52, the tip of the movable contact 52 is projected from the outlet side of the holding hole 51a, and the winding spring 54 is inserted. The abutment portion 54a is deformed in the closing direction of the movable contact 52, and the movable contact 52 is pushed in to move the shaft pin 55 to the stepped portion 51i (state (C) in FIG. 3). In this state, as shown in FIG. 3C, the bent portion of the contact portion 54a gets over the inflection point 51m of the ceiling surface 51f and is in contact with the inclined surface 51p. 2 (B) and 3 (B) are views showing the process of moving to the stepped portion 51i. In this state, the abutment portion 54a abuts against the horizontal surface 51n of the ceiling surface 51f. The shaft pin 55 is pressed toward the introduction slope 51e by the biasing force of the rotating spring 54. If the movable contact 52 is pushed out in this state, the winding spring 54 may be damaged.

  From the state where the shaft pin 55 is in the stepped portion 51i, only the movable contactor 52 is pushed into the outlet side. As shown in FIG. 2 and FIG. 3C, the contact portion 54a of the winding spring 54 is in contact with the inclined surface 51p located on the upper side as it goes to the outlet side. The force by which the shaft pin 55 due to the force is pressed toward the introduction slope 51e is weakened, and only the movable contact 52 can be pushed into the outlet side without deforming the winding spring 54. When the movable contact 52 is pushed to the outlet side, the contact portion 54a gets over the bent portion 51g, and the shaft pin 55 is received by the bearing portion 51c (state shown in FIGS. 2 and 3D). In this state, as shown in FIG. 3 (D), the contact portion 54a gets over the bent portion 51g, so that the movement of the shaft pin 55 toward the insertion side is hindered, and the shaft pin 55 Is fixed by the bearing portion 51c, and the attachment of the movable contact 52 to the cross bar 51 is completed. Thus, by forming the step portion 51i on the introduction slope 51e, when the movable contactor 52 is assembled, the shaft pin 55 abuts on the step portion 51i so that the operator can recognize the position of the shaft pin 55. The position and timing at which the winding spring 54 and the movable contact 52 are pushed in can be recognized from the position of the shaft pin 55, and the movable contact 52 can be easily attached to the cross bar 51.

  Moreover, as shown to FIG. 2 (A) and FIG. 3 (A), the positioning part 51h may be provided in the introduction slope 51e entrance. Only the movable contact 52 is inserted from the insertion side of the push-in holding hole 51a until the shaft pin 55 is positioned at the positioning portion 51h. Thus, only the movable contact 52 is pushed into the positioning portion 51h, and after the shaft pin 55 is brought into contact with the positioning portion 51h, the winding spring 54 and the movable contact 52 are pushed into the positioning portion 51h. The position and timing at which the winding spring 54 is pushed in can be easily recognized, and the workability can be further improved.

  As described above, in the present invention, since the step portion 51i is formed on the introduction slope 51e, the operator pushes the movable contact 52 toward the outlet side while deforming the contact portion 54a of the winding spring 54, and the step 51i is formed. After the shaft pin 55 comes into contact with the portion 51i, only the movable contact 52 is pushed to the bearing portion 51c, and the position on the introduction slope 51e of the shaft pin 55 into which the movable contact 52 and the winding spring 54 are to be pushed is easy. This makes it easy to attach the movable contact 52 to the cross bar 51. Further, by forming a positioning portion 51h at the inlet of the introduction slope 51e below the stepped portion 51i, only the movable contact 52 is pushed in until the shaft pin 55 comes into contact with the positioning portion 51h, and the holding hole 51a is inserted. The tip of the movable contact 52 is inserted from the side, and after the shaft pin 55 contacts the positioning portion 51h, the contact portion 54a of the winding spring 54 is deformed until the shaft pin 55 contacts the step portion 51i. In this structure, the movable contact 52 is pushed into the outlet side, and the positions and timings of pushing the movable contact 52 and the winding spring 54 can be easily recognized, and the workability can be further improved.

  In the embodiment described above, the positioning portion 51h and the step portion 51i have a step shape, but as shown in FIG. 4A, the positioning portion 51h and the step portion 51i are formed on the introduction slope 51e. Even if it is the shape of the recessed part made, it does not interfere. Alternatively, as shown in FIG. 4B, the positioning portion 51h and the stepped portion 51i may be protrusions formed on the introduction slope 51e. Even in the positioning part 51h and the step part 51i, the operator can appropriately position the shaft pin 55 on the introduction slope 51c for moving the movable contact 52 to the outlet side while deforming the contact part 54a. Alternatively, it is possible to recognize an appropriate position on the introduction slope 51c of the shaft pin 55 that pushes the movable contact 52 to the outlet side.

  Although the present invention has been described above in connection with the most practical and preferred embodiments at the present time, the present invention is not limited to the embodiments disclosed herein. The circuit breaker crossbar and movable contact mounting structure can be modified as appropriate without departing from the spirit or concept of the invention that can be read from the claims and the entire specification. It should be understood as encompassed by the scope.

51 Crossbar 51a Holding hole 51b Holding recess 51c Bearing part 51d Introduction part 51e Introduction slope 51f Ceiling surface 51g Bending part 51h Positioning part 51i Step part 51j Flat part 51k Flat part 51m Inflection point 51n Horizontal surface 51p Inclined surface 53 Moving contact 52 Movable contact 54 Winding spring 54a Contact part 54b Fixed part 55 Axial pin

Claims (2)

A cross bar having a plurality of holding holes;
A movable contact provided with a movable contact at the tip;
A shaft pin protruding from both side surfaces of the movable contact;
It consists of a winding spring wound around the shaft pin,
In the mounting structure of the crossbar and the movable contact of the circuit breaker for attaching the movable contactor assembled with the shaft pin and the winding spring to the crossbar,
On both side surfaces of the holding hole of the cross bar, an introduction slope for guiding the shaft pin to the bearing portion of the cross bar is formed,
A mounting structure for a crossbar and a movable contact of a circuit breaker, wherein a step portion is formed on the introduction slope.   2. The circuit breaker crossbar and movable contact mounting structure according to claim 1, wherein a positioning portion is formed at the inlet of the introduction slope.

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