JPH058850U - Circuit breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] The first purpose is a circuit breaker that can surely connect the handle and the movable contact without increasing the overall size and lowering the strength, and the second purpose is to further assemble. The purpose of the present invention is to provide a circuit breaker capable of simplifying the above. [Composition] In a circuit breaker using a compression spring type reversing spring, a shaft having a circular cross section is provided at the base end of the movable contactor, and the connecting portion of the handle is provided with an insertion hole through which the shaft of the movable contactor is inserted. Providing a projection that sandwiches the base end of, and connecting the guide part that guides the shaft so that the base end of the movable contact can be displaced to a position that does not overlap with this projection, is integrally formed,
When the shaft of the movable contact element is about to come off the connecting part of the handle due to the spring force of the reversing spring, it is regulated by the protrusion to realize a reliable connection. In addition, at the beginning of assembly, this guide part is extended in the direction in which the movable contact is moved away from the handle,
As a result, the compression amount of the reversing spring is reduced and the assembly is facilitated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a circuit breaker having a reversing spring suspended by compression.

[0002]

[Prior art]

  Since the circuit breaker is composed of many mechanical parts, it is an assembly process in the manufacturing process. There is a demand to simplify the work. Especially when performing automatic assembly, the spring member is usually a tension spring. Therefore, the assembly is troublesome. Therefore, the applicant of the present application has filed in Japanese Patent Application No. 2-43382, etc. A circuit breaker using a compression spring as a spring member has been proposed. This Has the configuration shown in FIG.

[0003]   In other words, this is a box-shaped body 1 with one side open The housing is composed of a lid (not shown) attached to the Assemble each member. The body 1 has a handle and a click, which are later described rotating members. It has first and second reference positions which are reference positions (rotation centers) of the ladle. concrete , The first reference position 1a for the handle is a circular recess, the second reference position for the cradle is 1b is an integrally erected shaft. Frame 2 provides a more accurate alignment of the relationships between the parts. It is fixed to the body 1 so that it can be placed or the handle to be described later can be clamped with the body. Be done. Further, the body 1 has through holes corresponding to the first and second reference positions 1a and 1b. There is. The handle 3 has an operating portion 3a and a rotary shaft 3b, and the rotary shaft 3b is the first reference position. It is axially supported by the circular recess of the body 1 and the through hole of the frame 2, Between them, there is a connecting portion 3c composed of irregularly shaped holes. Specifically, shown in FIG. 9 and FIG. As shown in the figure, there are two arcs having a step 3d in the middle in the thickness direction and having different radii in plan view. It has a modified hole.

[0004]   The movable contactor 4 has a shaft 5 provided at the base end rotatably supported by the connecting portion 3c, and the other end at the other end. It has a movable contact 6 and a first spring receiving portion 4a in the middle. Axis 5 is shown in Figure 9 and Figure As shown in 10, a large-diameter portion 5a having a diameter slightly smaller than the radius of the small arc of the connecting portion 3c, It has a small diameter portion 5b slightly longer than the thickness of the connecting portion 3c including the stepped portion 3d, and therefore has a large diameter portion. 5a is inserted into the deformed hole, and the thickness including the inner end surface of the large-diameter portion 5a and the movable contact 4 including the step 3d. It is attached so as to sandwich the part. The fixed contact 7 is moved by the operation of the movable contactor 4. It is provided on a fixed contact plate 8 which also functions as a terminal plate on the power source side so as to come into contact with and separate from the point 6. Abnormal current The detection means 9 includes a bimetal 10 whose base end is fixed to the frame 2 insulatively and a bimetal. A fixed iron piece 11 fixed in a U shape surrounding the middle of the tal 10 and a bimetal A leaf spring 12 whose base end is fixed to the tip of 10 and a base spring which is fixed to the tip of the leaf spring 12 And a movable iron piece 13 having a locking portion 13a. The movable iron piece 13 is the same as the fixed iron piece 11. It faces the end face, and when the short-circuit current flows through the bimetal 10, it is fixed with the fixed iron piece 11. Therefore, a magnetic path is formed on the fixed iron piece 11 instantly against the spring force of the leaf spring 12. It Also, if an overcurrent flows through the bimetal 10, it will be deformed counterclockwise. Then, the movable iron piece 13 is also displaced integrally. The base end of the bimetal 10 and the load side terminal plate 14, The tip of the metal 10 and the movable contact 4 are connected by a braided wire 15.

[0005]   The cradle 16 is pivotally supported on the shaft of the body 1 whose base end is the second reference position 1b, and A locked portion 16a locked to the locking portion 13a at the end, and a second spring receiving portion 16 at the intermediate portion. have b. The coiled reversing spring 17 is compression-suspended on both spring receiving portions 4a, 16b. It Both spring receiving portions 4a and 16b are in the normal state and in the contact state, When 16a is locked to the locking part 13a, the reversing spring 17 has a contact pressure function, which causes abnormal current. When the lock is released by the operation of the detection means 9, the cradle 16 is rotated, and eventually the contact opens. The reversing spring 17 is provided at a position for rotating the movable contact 4 so as to be in the state.

[0006]   Fig. 8 shows the handle 3 in the ON position and the reversing spring 17 in the contact state with the contact pressure function. Plays. In this state, rotate handle 3 clockwise to move it to the off position. Then, the line of action L connecting the axis 5 of the movable contactor 4 and each center of the first spring bearing portion 4a is closed. Since it is located on the opposite side of the center of the second spring bearing portion 16b of the dollar 16, As a result, the reversing spring 17 separates the movable contactor 4 from the fixed contact 7 and opens the contact. Also, when the abnormal current detection means 9 operates in the contact state, the locked portion 16a moves to the locking portion 13a. Since it is disengaged from a, the cradle 16 is rotated counterclockwise by the reversing spring 17, and eventually The center of the second spring bearing portion 16b is in the center of the shaft 5 of the movable contactor 4 and the first spring bearing portion 4a. Crossing the line of action L connecting the hearts, the reversing spring 17 also moves the movable contact 4 from the fixed contact 7 The contacts are separated from each other and the contact is opened.

[0007]   This product uses a reversing spring as a compression spring instead of a tension spring, so it is easy to assemble. I was able to contribute to ease.

[0008]

[Problems to be solved by the device]

  By the way, as described above, the connecting portion 3c of the handle 3 and the shaft 5 of the movable contactor 4 are connected. In the connection structure, the movable contact 4 is moved away from the handle 3 by the spring force of the reversing spring 17. A force in the zap direction and a force in the orthogonal direction act on it. This orthogonal force is At this time, the inner end surface of the large diameter portion 5a of the is to be disengaged from the stepped portion 3d of the handle 3, but On the other hand, it is not impossible to increase the amount of engagement between the two. But that In this case, the large diameter part 5a should be made larger or the small diameter part 5b should be made smaller. In other words, the former causes an increase in size of the whole and the latter causes a decrease in strength. Another From the viewpoint of using a compression spring, there is a demand to further simplify the assembly work. is there.

[0009]   The present invention has been made in view of the above circumstances, and its first purpose is to: Securely connects the handle and movable contact without increasing overall size or reducing strength The second purpose is to provide a circuit breaker that can be easily assembled. To provide a circuit breaker.

[0010]

[Means for Solving the Problems]

  In order to solve such a problem, the circuit breaker according to claim 1 is a base of a movable contactor. A shaft with a circular cross section is provided at the end, and the connecting part of the handle is an insertion hole through which the shaft of the movable contact is inserted. A protrusion that sandwiches the base end of the movable contact is also provided, and does not overlap this protrusion. The guide part that guides the shaft so that the base end of the movable contact can be displaced to the position It is configured as a body.

[0011]   The circuit breaker according to claim 2 is such that the guide portion of the insertion hole according to claim 1 is The configuration is such that the dynamic contact extends in the direction of moving away.

[0012]

[Action]

  According to the configuration of claim 1, the force that the movable contact element tries to disengage from the handle is applied. Even if received, the movable contact was pinched by the handle with a sufficient amount of engagement by the protrusion. Since they are in a state, the connection between the two is assured.

[0013]   According to the configuration of claim 2, the amount of compression of the reversing spring is small in the assembly work. Therefore, the assembly can be further simplified.

[0014]

【Example】

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. Note that Since only the handle and the movable contact differ from the conventional example, the functions are substantially the same. The same reference numerals are given to the members, and detailed description of other members will be omitted.

[0015]   1 is a body, which has a box shape with one side open and a housing (not shown) Configure the ring. Body 1 has a first reference position for the handle, which is a circular recess 1a and a second reference position 1b for a cradle, which is composed of a shaft that is integrally erected. 1c is The opening for the handle allows the handle operating part, which will be described later, to move to the on and off positions. Has the breadth to gain. 2 is a frame corresponding to the first and second reference positions 1a and 1b It has a through hole and is fixed to the body 1.

[0016]   3 is a handle, which is made of plastic and has an operating part 3a and a rotating shaft 3b. However, the rotary shaft 3b becomes the first reference position 1a, and the circular recess of the body 1 and the frame 2 While being axially supported by the through hole, a connecting portion 3c formed of a deformed hole is provided between them. This handle 3 has a thin-walled base provided with a rotating shaft 3b when viewed in the extending direction of the operating portion 3a. Part, an arc-shaped intermediate part provided with a connecting part 3c, and a thick-walled tip part which is the operating part 3a. be able to. The thin base has a thickness about 1/2 to 1/3 that of the thick tip. It is formed so as to be biased toward the wall surface side of the body 1. And the resulting ablated space The base end side of the movable contact, which will be described later, is inserted in. The main part of the present invention is the Details of the connecting portion 3c will be described later.

[0017]   The movable contact 4 has a metal plate material punched out, and the base end side piece 4a and the other end side piece 4b are formed at a substantially right angle. It is bent and has a shaft 5 with a circular cross section at the base end that can be rotated to the connecting part 3c. And has a movable contact 6 at the other end. Also, the middle part, specifically the other end side piece A first spring receiving portion 4a is provided at the end of the base end side of 4b.

[0018]   Here, the connecting portion 3c of the handle 3 will be described in association with the movable contactor 4. Connection 3c includes a through hole 3e that allows the shaft 5 of the movable contactor 4 to be inserted and determines the positional relationship between the two. The projection 3f is provided so as to sandwich the base end of the movable contactor 4 (the end of the base end side piece 4a). This protrusion 5f is effective in removing the shaft 5 from the insertion hole 3e. Cannot be inserted into the insertion hole 3e. Therefore, connect part 3c to a position where it does not overlap with this protrusion 5f. Align the base end of the movable contactor 4 (the end of the base end side piece 4a) with the shaft along the rotation direction. A guide portion 3g for guiding 5 is connected to the insertion hole 3e to be integrally formed.

[0019]   Reference numeral 7 is a fixed contact, which is fixed so that it is brought into contact with and separated from the movable contact 6 by the operation of the movable contact 4. It is provided on the point plate 8. 9 is an abnormal current detection means, the base end of which is fixed to the frame 2 Wearing bimetal 10 and fixed in a U shape surrounding the middle of bimetal 10 Fixed iron piece 11, a leaf spring 12 whose base end is fixed to the tip of the bimetal 10, and a base end Is fixed to the tip of the leaf spring 12 and includes a movable iron piece 13 having an engaging portion 13a in the middle. ing. 15 is a braided wire, the base end of the bimetal 10, the load side terminal plate 14, and the bimetal 10 The tip and the movable contactor 4 are electrically connected to each other.

[0020]   16 is a cradle, the base end of which is axially supported by the shaft of the body 1 which is the second reference position 1b, The locked portion 16a locked to the locking portion 13a at the tip, and the second spring receiving portion at the middle portion It has 16b. Reference numeral 17 denotes a coil-shaped reversing spring, which is compression-suspended on both spring receiving portions 4a and 16b. To be done. Both spring receiving portions 4a and 16b are provided at the same positions as those of the conventional example.

[0021]   The operation of this circuit breaker is similar to that of the conventional example. And the reversing spring 17 When the shaft 5 of the movable contactor 4 is disengaged from the connecting portion 3c of the handle 3 due to the spring force The base end of the movable contactor 4 is regulated by the protrusion 3f, so that the connected state can be reliably maintained. That In the assembly that connects the shaft 5 to the connecting part 3c, first install the guide part 3g that is not obstructed by the protrusion 5f. It may be inserted and then moved to the insertion hole 3e while being guided by the guide portion 3g.

[0022]   In this embodiment, the first reference position 1a is defined by the circular recess of the body 1 and the second reference position 1a. Position 1b is an axis that stands up from body 1, but these can be changed as appropriate. , Both are fixed by caulking the reference shaft to the frame 2, or both are erected from the body 1. It may be used as an axis.

[0023]   Next, a second embodiment of the present invention will be described with reference to FIGS. This one is Only the shape of the guide portion 3g of the first embodiment is different. That is, the guide portion 3g of the first embodiment is It is connected to the insertion hole 3e and extends in the rotation direction. It is extended to the other end side of 4. That is, the shaft 5 of the movable contactor 4 is located at the connecting portion 3c. As shown in Fig. 5, when first inserting the guide part 3g, the handle 3 The movable contact 4 will be moved further away. As a result, the compression amount of the reversing spring 17 The work can be done in a very small state.

[0024]

[Effect of device]

  The circuit breaker according to claim 1 prevents the movable contact from being disengaged from the handle. Even if received, the movable contact was pinched by the handle with a sufficient amount of engagement by the protrusion. Since it is in a state, the connection between the two is assured, so the overall size is large and the strength is low. The connection between the handle and the movable contactor can be ensured without lowering.

[0025]   The circuit breaker according to claim 2 has a small compression amount of the reversing spring in the assembling work. Therefore, the assembly can be further simplified.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is an enlarged front view of essential parts showing an initial state at the time of assembling the same as above.

FIG. 3 is an enlarged front view of essential parts showing the completed assembly state of the above.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is an enlarged front view of the essential parts of the second embodiment of the present invention, showing the initial state during assembly.

FIG. 6 is an enlarged front view of an essential part showing the completed assembly state of the above.

7 is a cross-sectional view taken along the line AA of FIG.

FIG. 8 is a front view showing a conventional example.

FIG. 9 is an enlarged front view of the essential parts showing the completed assembly state of the above.

10 is a cross-sectional view taken along the line AA of FIG. 9.

[Explanation of symbols]

1 body 1a First reference position 1b Second reference position 3 handles 3a Operation part 3b rotation axis 3c connection 3e insertion hole 3f protrusion 3g guide 4 Movable contact 4a First spring receiving portion 5-axis 6 Moving contact 7 Fixed contact 16 cradle 16b Second spring receiving portion 17 Inversion spring

Claims (2)

[Scope of utility model registration request] 1. A handle, which has an operating portion, is pivotally supported at a first reference position, and is provided with a connecting portion therebetween,
A movable contact having a base end rotatably supported by the connecting portion and a movable contact at the other end, and a first spring receiving portion provided in the middle portion, and a fixed member that comes into contact with and separates from the movable contact by the operation of the movable contact. Contacts,
An abnormal current detecting means having a locking portion; a cradle having a locked portion to be locked by the locking portion, pivotally supported at a second reference position, and provided with a second spring receiving portion; A reversing spring compression-suspended on both spring receiving parts, and both spring receiving parts are in a normal state and in a contact state, and the reversing spring when the locked part is locked to the locking part. Has a contact pressure function, and when the lock is released by the operation of the abnormal current detection means, the cradle is rotated and the circuit breaker is provided at the position where the reversing spring rotates the movable contact so that the contact is opened. In the container, a shaft having a circular cross section is provided at the base end of the movable contactor, and the connecting portion of the handle is provided with a projection for sandwiching the base end of the movable contactor together with an insertion hole through which the shaft of the movable contactor is inserted. Guide the shaft so that the base end of the movable contact is displaced to a position where it does not overlap this protrusion. A circuit breaker, characterized in that a guide portion for guiding is formed integrally with the insertion hole. 2. The circuit breaker according to claim 1, wherein the guide portion of the insertion hole extends in a direction in which the movable contactor moves away.