JP2005190972A - Circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a circuit breaker having a miniaturized structure of a switching mechanism part. <P>SOLUTION: The switching mechanism part 3 is constructed so that an acting direction of a main spring 19 against a connection link 13 turns in reverse each time the main spring 19 moves to cross the position of a jointing axis 36 held at a prescribed position, by the movement of an upper side spring pin 32 making the main spring 19 move by sliding through a sliding groove 11b when a handle 12 rotation freely arranged to a frame 11 is rotated; and constructed so as to make a fixed contacting member 21 and a movable contacting member 22 perform a switching movement through a pushing plate 20 by the rotation of the connection link 13 depending on the reversal turn thereof. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a circuit breaker such as a circuit breaker for wiring and an earth leakage breaker, and more specifically, provides a novel mechanism for downsizing or thinning of an opening / closing mechanism.

In the open / close mechanism of a conventional circuit breaker having an upside down handle, the upper link and the lower link are placed between the handle and the movable contact in order to open / close the movable contact with respect to the fixed contact and to perform a trip operation due to overcurrent. Components such as links and handle arms are required. The upper link and the lower link are usually a U-shaped part, or a part in which both ends of two plates facing each other with a gap are joined by a shaft. (For example, refer to Patent Document 1 or 2.)
In order to reverse this link mechanism with a strong opening and closing spring when turning on and off, a handle lever of a part that is larger than the link mechanism and bent into a U shape is used. Yes. (For example, refer to Patent Document 2).

Japanese Examined Patent Publication No. 6-97591 (FIG. 1) Japanese Patent Laid-Open No. 11-86714 (FIGS. 1 and 3)

  In the conventional circuit breaker, when opening and closing the fixed contact and the movable contact, the link mechanism is reversed with a strong force opening and closing spring, so that it has a larger shape than the link mechanism and is bent into a U-shape. The handle lever of the part was used. Therefore, it has been a major reason for limiting the size of the opening / closing mechanism. In particular, in the earth leakage breaker, when the earth leakage detection device leakage trip coil and the like are integrally configured together with the circuit breaker mechanism, there is a great need for downsizing the opening / closing mechanism. Also, when incorporating an internal accessory device such as an alarm / auxiliary switch or undervoltage trip device into a circuit breaker, it is usually arranged on both sides of the handle, that is, on both sides of the opening / closing mechanism, so the thickness of the opening / closing mechanism There is a great need to reduce the size of the direction. In recent years, along with miniaturization of circuit breakers, problems related to miniaturization and thinning of the switching mechanism have been regarded as important due to the above circumstances. In particular, with regard to thinning, the reduction of the thickness (1 mm to 2 mm) of one sheet thickness of the parts of the opening / closing mechanism part is a problem due to the structure of the opening / closing mechanism part or the structure of the accessory device. I see. Even if the size is reduced, the breaking current does not change, so a smooth operation mechanism for opening and closing a large contact mechanism with a small handle is required.

  The present invention has been made to solve the above-described problems. A first object of the present invention is to obtain a circuit breaker having a configuration in which both the front side and the thickness side are miniaturized in the switching mechanism. Is. A second object is to obtain a circuit breaker that can be miniaturized and has a smooth handle operation.

In the circuit breaker according to the present invention, it is mainly characterized by the opening / closing mechanism.
The opening / closing mechanism is handle-engaged with a frame that is housed in a housing and has a handle rotatably provided at the upper end side, and a sliding groove formed in the frame near the position of the handle, The upper spring pin that slides in the sliding groove by the rotation of the handle and the upper end side is held at a predetermined position via the connecting shaft, and the lower spring pin is provided on the lower end side and can be rotated about the connecting shaft. An upper link configured as described above, a connect link having one end rotatably supported by the frame, an intermediate portion connected to the upper link, and the other end connected to a push plate, the upper spring pin, A main spring suspended between the lower spring pin, and when the handle is rotated, the upper spring pin slides in the sliding groove to move the main spring. Whenever the movement of the main spring exceeds the position of the connecting shaft held at a predetermined position, the direction of action of the main spring with respect to the connect link is reversed, and the connection link is rotated by this reversal, and is fixed via the push plate. It is designed to open and close the contact and the movable contact.

  Further, between the pair of frame plates forming the frame, all the link parts such as the handle and the upper link, the lower link, and the connect link are inserted and held in close contact with each other. It is suspended between the spring pin and the lower spring pin.

According to the present invention, since the opening / closing mechanism portion does not use a conventional handle lever bent in a U shape, the circuit breaker can be provided in a space-saving and low cost by being miniaturized.
In addition, it becomes easy to deal with a case where an auxiliary device is built in the circuit breaker or a leakage breaker.
Furthermore, it is possible to obtain a circuit breaker having a small handle and a smooth handle operation.

Embodiment 1 FIG.
1 and 2 show a circuit breaker 100 according to Embodiment 1 for carrying out the present invention. FIG. 1 is a front view showing the entire circuit breaker, and FIG. 2 is a main part of the present invention. It is a perspective view which expands and shows the opening-and-closing mechanism part which is. 1 is normally described as a side view as a drawing of the circuit breaker, but in this embodiment, the drawing of FIG. 1 will be described as a front view in relation to other drawings.

  In FIG. 1, a base 1 and a cover 2 constitute a casing of a circuit breaker, and are formed of a synthetic resin material. The opening / closing mechanism 3 is disposed inside the housing, and a handle 12 described later projects from the handle window hole 2 a of the cover 2 to the surface of the cover 2. The open / close contact portion 4 has a configuration generally referred to as a bridged two-contact system. The overcurrent trip device 5 operates the open / close mechanism 3 when an overcurrent flows through a power supply side terminal 6 and a load side terminal 7 connected to an electric circuit (not shown). Of the configuration. An arc extinguishing device and a terminal screw are also provided, but they are not shown because they are not related to the present invention.

  In FIG. 2, the opening / closing mechanism unit 3 includes a link mechanism such as a connect link 13 and an upper link 14, a handle 12 supported by a handle shaft 31, and the like between two frames 11. The main spring 19 is suspended between an upper spring pin 32 operated by the handle 12 and a lower spring pin 35 connected to the link mechanism, and expands or contracts when the opening / closing contact portion 4 is opened / closed. It is designed to reverse the direction. The push plate 20 is connected to a link mechanism, and a movable contact 22 provided at one end is separated from and connected to a fixed contact (not shown). 18 is a known trip bar which is actuated by the overcurrent trip device 5 as described later.

  Next, details of the components of the opening / closing mechanism 3 will be described with reference to FIGS. 3 is a perspective view of the frame 11, FIG. 4A is a front view, and FIG. 3B is a side view. This frame 11 is a combination of a pair of frame plates 111 and 112 that are formed almost symmetrically using a steel plate having a thickness of 1 mm. As an outline of the size, for example, the dimension H is 44 mm, the dimension W is 23 mm, and the dimension T is 6 mm for a circuit breaker of 100 amp frame. 3 and 4, the frame 11 is a combination of the frame plates 111 and 112 (there is no component such as a link mechanism inside), but the frame 11 includes the open / close contact portion 4. The frame plates 111 and 112 are combined such that a handle, a link mechanism, shafts and the like described later are sandwiched between the frame plates 111 and 112 from both sides.

  In the figure, there are various through holes and guide pieces as follows, and related parts will be described later. That is, the handle 12 is pivotally supported in the through hole 11a. The upper spring pin 32 is fitted in the arcuate sliding groove 11b so that it can slide. A connect link 13 is pivotally supported in the through hole 11c. A latch 17 is pivotally supported in the through hole 11d. A lever 16 is pivotally supported in the through hole 11f. A trip bar 18 is pivotally supported in the through hole 11g. The penetrating window 11 h is used as an operating space of the lower spring pin 35 and a part of an edge of the operating space as a locking portion of the lower spring pin 35. The guide piece 11k is provided in order to suppress misalignment of components arranged near the center position between the frame plates 111 and 112. Reference numeral 11m denotes a screw hole, which is used for screwing the opening / closing contact portion 4 to the base 2.

  FIG. 5 shows a handle 12 made of, for example, a synthetic resin material, where (a) is a front view, (b) is a side view, and (c) is a rear view. In the figure, reference numeral 12a denotes an engagement hole, into which an upper spring pin 32 described later is fitted. However, since the upper spring pin 32 follows the arc-shaped sliding groove 11b formed in the frame 11, the position of the upper spring pin 32 moves in the vertical direction when viewed from the handle 12 side. Therefore, the engagement hole 12a may be formed as a long hole extending in the direction of the position of the support hole 12b, or may be a slot groove having an opening at the end edge of the handle 12 by extending the long hole.

  FIG. 6 shows a connect link 13 formed of, for example, a steel plate, where (a) is a front view and (b) is a bottom view. In the figure, the through hole 13a is a hole for pivotally supporting the through hole 11c of the frame 11. The through-hole 13b is a hole that is pivotably connected to a lower link 15 described below before being clamped by the frame 11. The through hole 13c is a hole for connecting a push plate 20 described later.

  FIG. 7 shows an upper link 14 formed of, for example, a steel plate, where (a) is a front view and (b) is a bottom view. In the drawing, a through hole 14a is a hole for mounting a lower spring pin 35 described later. The through hole 14b is a hole for pivotally connecting to a lever 16 described later before being sandwiched by the frame 11. Reference numeral 14c denotes a U-bend portion, and the through hole 14a is formed through the U-bend portion 14c.

  FIG. 8 shows a lower link 15 formed of, for example, a steel plate, where (a) is a front view and (b) is a bottom view. In the figure, the through-hole 15a is a hole for pivotally connecting to the connect link 13 before being sandwiched by the frame 11 as described above. The through hole 15 b is a hole for connecting to the upper link 14 via the lower spring pin 35 when sandwiched by the frame 11.

  FIG. 9 shows a lever 16 formed of, for example, a steel plate, where (a) is a front view and (b) is a side view. In the drawing, a through hole 16a is a hole for pivotally connecting to the upper link 14 before being sandwiched by the frame 11. The through hole 16b is a hole for rotatably supporting the through hole 11f of the frame 11. The locking protrusion 16c is formed to be locked to a rotation locking portion 17c of the latch 17 described later.

  FIG. 10 shows a latch 17 formed of, for example, a steel plate, where (a) is a front view and (b) is a side view. In the figure, reference numeral 17a denotes a hole for rotatably supporting the through hole 11d of the frame 11. Reference numeral 17b denotes a trip locking portion that is locked to a trip bar 18 described later. Reference numeral 17 c denotes a rotation locking portion for locking the rotation of the lever 16.

The connect link 13, the upper link 14, the lower link 15, the lever 16, and the latch 17 are each formed of a steel plate having a thickness of 1 mm. And it is clamped by the frame 11 together with the handle 12. In this clamping, the five parts including the connect link 13, the upper link 14, the lower link 15, the lever 16, and the latch 17 must be clamped in the 6 mm space of the frame 11 so that they can rotate.
In this case, in order to reduce the width dimension of the opening / closing contact portion 4, the above five components are inserted in close contact. That is, the space of the frame 11 is set so that six parts cannot be inserted if the parts have the same thickness. For this reason, some have been bent so that adjacent parts do not interfere.

  FIG. 11 shows a trip bar 18 formed of a synthetic resin material. FIG. 11A is a front view seen from the link mechanism side, and is partially cut away. (B) is sectional drawing in the KK line | wire. In the figure, 18a is a through hole for pivotally supporting the frame 11. Reference numeral 18b denotes a latch locking portion.

Next, a state in which each of the above components is assembled as an opening / closing mechanism will be described. However, if all parts are shown in a lump, the shape of each part and the relationship with other parts will be difficult to understand, so the drawing (illustrated) will be divided as if it is on or off, Only the parts related to the state are shown, and other parts will be omitted from the description. In this case, for the sake of explanation, there is a portion where the relationship between the parts before and after (the relationship between the solid line and the broken line) is different from the relationship of FIG.
FIG. 12 is a side view of the opening / closing mechanism unit 3, and the five link parts including the connection link 13, the upper link 14, the lower link 15, the lever 16, and the latch 17 are in close contact between the frame plates 111 and 112. Indicates that it has been inserted into the state. Further, the main spring 19 is suspended between the upper spring pin 32 and the lower spring pin 35 on both outer sides of the frame 11.

  First, FIG. 13 shows a state where the stationary contact 21 and the movable contact 22 are closed, that is, an on state. In this state, the handle 12 is in a position rotated in the direction of the arrow RA about the handle shaft 31, and the upper spring pin 32 engaged with the engagement hole 12 a of the handle 12 is formed in an arc shape of the frame 11. It is brought to the left side of the sliding groove 11b. The upper spring pin 32 is provided with a roller 32a for smooth movement with respect to the sliding groove 11b. Since a strong force from the main spring 19 is applied to the roller 32a, a metal roller considering the durability is desirable. The connect link 13 is rotatably supported by a link support shaft 33 provided in the through hole 11 c of the frame 11. One end of the lower link 15 is rotatably connected to the connect link 13 by a link connecting shaft 34, and the other end of the lower link 15 is a lower spring provided in a through hole 14b in the U-bending portion 14c of the upper link 14. A pin 35 is rotatably connected to the upper link 14. An upper end side of the upper link 14 is rotatably connected to an upper end side of a lever 16 described later by a lever connecting shaft 36. When the handle 12 is manually operated from on to off and from off to on, the lever connecting shaft 36 is always in a predetermined position (see FIG. 13).

  The main spring 19 is a pair of tension springs and is suspended between both ends of the upper spring pin 32 and both ends of the lower spring pin 35. The main spring 19 applies an urging force that rotates in the direction of the arrow RB about the lever connecting shaft 36 to the upper link 14. The rotation of the upper link 14 is stationary in a state where the lower spring pin 35 is in contact with and locked to the window hole portion 11 h of the frame 11. Further, the rotational biasing force of the upper link 14 is transmitted to the connect link 13 via the lower link 15, and the biasing force is applied so that the connect link 13 rotates about the link support shaft 33 in the direction of the center arrow RC. ing. The turning biasing force of the connect link 13 works so as to close the fixed contact 21 and the movable contact 22. That is, the push plate 20 is connected to the tip of the connect link 13 by the push plate connecting shaft 37, and the movable contact 22 is provided on the push plate 20. Although the fixed contact 21 is provided to face the movable contact 22, the fixed contact 21 and the movable contact 22 according to this embodiment are generally of a bridge type two-contact type as shown in FIG. It is the composition called. The movable contact 22 is configured to close to the fixed contact 21 with a predetermined contact pressure by an urging force of a contact pressure spring (not shown) built in the push plate 20.

  Next, an operation for changing the ON state in FIG. 13 to the OFF state in FIG. 14 will be described. This turning-off operation is performed by tilting the handle 12 to the left (turning in the direction of arrow LA). That is, when the handle 12 is rotated to the left, the upper spring pin 32 is guided to the sliding groove 11a of the frame 11 and moved to the right as shown in FIG. In the course of this movement, when the action line of the main spring 19 suspended between the upper spring pin 32 and the lower spring pin 35 exceeds the position of the lever connecting shaft 36, the action direction of the main spring 19 with respect to the upper link 14 is changed. Invert. By this reversal, a biasing force that rotates in the direction of the arrow LB about the lever connecting shaft 36 is applied to the upper link 14. When the upper link 14 rotates in the direction of the arrow LB, an urging force is also applied to the connect link 13 via the lower link 15. By this urging force, the connect link 13 rotates in the direction of arrow LC about the link support shaft 33. Accordingly, the movable contact 22 is separated from the fixed contact 21 via the push plate 20 connected to the tip of the connect link 13 and is turned off as shown in FIG. The operation to turn from OFF to ON is performed by tilting (turning) the handle 12 to the right side. In this case, the reversal of the action direction of the main spring 19 and the rotation of the upper link 14 and the like are as follows. The description is omitted because it is only in the opposite direction to the above.

  In the above description, when the handle 12 is manually operated from on to off and from off to on, the lever connecting shaft 36 is always held at a predetermined position (position shown in FIG. 13). The relationship of the configuration in the on state will be described with reference to FIG. For this holding, there are a lever 16 rotatably supported by a lever support shaft 38 provided on the frame 11 and a latch 17 rotatably supported by a latch support shaft 39. The upper end side of the lever 16 is connected to the upper end side of the upper link 14 by a lever connecting shaft 36. Accordingly, in the state of FIG. 15, the lever 16 is attached to the main spring 19 suspended from the lower spring pin 35 via the upper link 14 so as to rotate in the direction of the arrow LD about the lever support shaft 38. It will be.

  The state in which the lever 16 is urged in the direction of the arrow LD is locked by the latch 17 as follows. That is, the latch 17 is rotatably supported on the frame 11 by the latch support shaft 39. However, the latch 17 is normally rotated in the arrow LE direction by the weak spring 23 provided on the latch support shaft 39. It is energized. As shown in the component diagram of FIG. 10, the latch 17 has a rotation locking portion 17c formed by being bent in a U-shape. The locking protrusion 16c formed on the lever 16 is engaged, and the rotation of the lever 16 in the arrow LD direction is locked. Since this engagement is performed by the strong force of the main spring 19, the biasing force of the twist spring 23 is canceled out, and the biasing force of the latch 17 rotating in the direction of the arrow RD by the turning force of the lever 16 is applied. is recieving. At this time, the latch 17 is locked by a known trip bar 18 so as not to rotate. Since it is configured as described above, the lever connecting shaft 36 is always held at a predetermined position (position shown in FIG. 13).

  This holding will be described with reference to FIG. In this case, the upper link 14 is rotated in the direction of the arrow LB about the lever connecting shaft 36 by the operation of the handle 12. However, similarly to the on state, the main spring 19 suspended from the lower spring pin 35 causes the lever 16 to be pivoted about the lever support shaft 38 in the direction of the arrow LD via the upper link 14. It will be. Therefore, as in the ON state, the lever connecting shaft 36 is always held at a predetermined position (position shown in FIG. 12). As can be understood from the above, when turning on and off, the lever connecting shaft 36 is the center, and the main spring 19 is reversed and the upper link 14 is operated.

  Next, a trip operation (trip) when an overcurrent exceeding a predetermined value flows will be described. When an overcurrent flows, the overcurrent tripping device operates to rotate the trip bar 18 as shown by an arrow LH in FIG. That is, in the on state of FIG. 15, the relationship between the trip bar 18, the latch 17, the lever 16, and the like is as shown in the figure. In this state, when the trip bar 18 rotates in the arrow LH direction, the latch 17 locked to the trip bar 18 is released. As soon as the latch 17 is released, the latch 17 is rotated clockwise as the locking protrusion 16c of the lever 16 engages with the rotation locking portion 17c formed by being bent in a U shape as described above. Power is added. Accordingly, the latch 17 is rotated in the direction of the arrow RD as shown in FIG. 17, and the lever 16 is disengaged from the latch 17 and is rotated in the direction of the arrow LD by the urging force of the main spring 19 to rotate as shown in FIG. Stop in position. This stop is stopped by a stopper 11 n provided on the frame 11 by the lever 16. When the lever 16 is stopped, the handle 12 is engaged with the tip of the lever 16, and the handle 12 stops at an intermediate position between on and off as shown in the figure. Thereafter, the trip bar 18 returns to its original position by the biasing force of a twist spring (not shown). Further, the reset operation for returning from the trip state to the normal state is performed by turning the handle 12 in the off direction, as in the case of the conventional circuit breaker. The explanation is omitted because it is not directly related to the gist.

According to the circuit breaker having the above-described configuration, the size of the opening / closing mechanism unit 3 makes it easy to cope with application to an attached device or a leakage breaker. Further, since the range of movement when the handle 12 is turned from on to off or from off to on is small, the handle window hole 2a of the cover 2 becomes small. This makes it easy to display various symbols or nameplates on the front surface of the cover 2.
The opening / closing mechanism 3 according to the present invention can be applied not only to the bridge-type two-contact type switching contact 4 but also to a general type switching contact.

Embodiment 2. FIG.
In the above configuration, the arc-shaped sliding groove 11b formed in the frame 11 is formed in an arc shape that is inclined in a direction in which the main spring 19 is extended as the handle 12 is turned from on to off. . This is designed to generate a biasing force that returns the handle to the original on or off position when the handle is not operated or when the hand is released during the operation. In this case, the arc shape of the sliding groove 11b may be a simple arc shape, but a more desirable operation can be obtained if it is a special arc shape as shown in FIG. That is, in the sliding groove 11b, as shown in the figure, the arc S on the lower side is inflection point at an approximately middle position of the sliding groove 11b, and the above inflection point in the vicinity of the lower spring pin 35 with the radius center. It is made into the circular arc shape formed by two types of radial dimensions R-1 and R-2. That is, a substantially square shape with the intermediate position as the inflection point is formed. Note that the upper arc U does not have to be considered in particular because the upper spring pin 32 is not in contact.

  By forming the sliding groove 11b as described above, it is possible to increase the handle biasing force when the handle 12 is turned from on to off and the turning is stopped halfway. Return to the on position. Even when the handle 12 is turned from off to on and stopped halfway, the handle 12 surely returns to the off position.

Embodiment 3 FIG.
In the above configuration, the engagement hole 12a of the handle 12 has been described as a long hole or a slit groove. However, when the engagement hole 12a is a simple long hole or a simple slit groove, the upper spring pin 32 is moved into the arcuate sliding groove 11b of the frame 11 when the handle 12 is turned off from on. The pressing force increases and it is difficult to obtain a smooth rotation of the handle 12. For this reason, the engagement hole 12a is shaped as shown in FIG. That is, when the handle 12 is on, the engagement hole 12a includes a pressing portion 12c that presses the upper spring pin 32 in a direction along the shape of the sliding groove 11b. In this embodiment, for example, as shown in FIG. 19, the engagement hole 12a has a pressing direction that is about 27 degrees upward from a line perpendicular to the center line connecting the handle 12 and the upper spring pin 32. Set.

The upward angle is obtained by calculation or experiment. When the angle of 27 degrees is increased, the pressing force against the sliding groove 11b is reduced, but the engagement hole 12a needs to be increased. As a result, there is a problem that the gap with the upper spring pin 32 becomes large and the opening / closing operation is not smooth. In the above configuration according to the present invention, this angle is suitably 27 degrees.
Note that the pressing portion 12c can be set in the same way when the handle 12 is turned from off to on. By the pressing portion 12c of the engagement hole 12a as described above, the movement of the upper spring pin 32 is smooth and the operation of the handle 12 is facilitated.

It is a front view of the circuit breaker which shows embodiment of this invention. It is a perspective view which shows the opening-and-closing contact part which is the principal part of this invention. It is a perspective view which shows the external appearance of a flame | frame. It is a component drawing which shows the detail of a flame | frame. It is a component diagram which shows the detail of a handle | steering-wheel. It is a component diagram which shows the detail of a connection link. It is a component drawing which shows the detail of an upper link. It is a component drawing which shows the detail of a lower link. It is a component drawing which shows the detail of a lever. It is a component diagram which shows the detail of a latch. It is a component diagram which shows the detail of a trip bar. It is a side view for description of an opening / closing contact part. It is a block diagram for description which shows the ON state of an opening-and-closing contact part. It is a block diagram for description which shows the OFF state of an opening-and-closing contact part. It is a block diagram for description of the other part which shows the ON state of an opening-and-closing contact part. It is a block diagram for description of the other part which shows the OFF state of an opening-and-closing contact part. It is a block diagram for description which shows the trip state of an opening-and-closing contact part. It is explanatory drawing which shows the detail of the sliding groove | channel of a flame | frame. It is explanatory drawing which shows the detail of the engagement hole of a handle | steering-wheel.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 1 Base, 2 Cover, 3 Opening and closing mechanism part, 4 Opening and closing contact part, 5 Overcurrent tripping device, 11 Frame, 11b Sliding groove, 11k Guide piece, 12 Handle, 12a Engagement hole, 12b Bearing hole, 13 Connect Link, 14 Upper link, 15 Lower link, 16 Lever, 17 Latch, 18 Trip bar, 19 Main spring, 20 Push plate, 21 Fixed contact, 22 Movable contact, 31 Handle shaft, 32 Upper spring pin, 32a Roller, 35 Lower spring pin, 36 Lever connecting shaft (connecting shaft), 100 Circuit breaker, 111, 112 Frame plate.

Claims (9)

A stationary contact housed in a housing and connected to an electric circuit, a movable contact element provided opposite to the stationary contact element and connected to the electric circuit, a push plate coupled to the movable contact element, and the push plate An opening / closing mechanism for operating the opening / closing mechanism; and a handle for operating the opening / closing mechanism from the outside, and the movable contact when the handle is turned from the on position to the off position or from the off position to the on position. In the circuit breaker which is separated from the stationary contact,
The opening / closing mechanism portion is housed in the housing and the handle is rotatably provided on the upper end side, a sliding groove formed in the frame near the position of the handle, and the handle The upper spring pin that is engaged and slides in the sliding groove by the rotation of the handle, the upper end side is held at a predetermined position via the connecting shaft, and the lower spring pin is rotatably held on the lower end side. An upper link that can be rotated around the connecting shaft, one end of which is rotatably supported by the frame, an intermediate portion connected to the upper link, and the other end to the push plate A connected link and a main spring suspended between the upper spring pin and the lower spring pin;
When the handle is rotated, the upper spring pin slides in the sliding groove to move the main spring, so that the movement of the main spring exceeds the position of the connecting shaft held at the predetermined position. In addition, the direction of action of the main spring with respect to the connect link is reversed, and the rotation of the connect link due to this reversal causes the stationary contact and the movable contact to be opened and closed via the push plate. vessel.   The open / close mechanism is inserted between a pair of frame plates forming a frame and all link parts such as an upper link, a lower link, and a connect link are inserted and held in close contact with each other. 2. The circuit breaker according to claim 1, wherein the circuit breaker is suspended between the upper spring pin and the lower spring pin.   The sliding groove has a substantially circular arc shape with the radius center in the vicinity of the lower spring pin, or the inflection point with respect to each other in the vicinity of the lower spring pin with the radius center at the middle position of the sliding groove. 3. The circuit breaker according to claim 1 or 2, wherein the circuit breaker is formed by two arcs extending beyond each other, and has a substantially square shape.   The engagement hole is a long hole extending in the direction of the support hole. When the handle is in the on position and when the handle is in the off position, the upper spring pin is formed in the shape of a sliding groove. The circuit breaker according to any one of claims 1 to 3, further comprising a pressing portion that presses in a direction along the direction.   5. The frame according to claim 1, wherein a frame having sliding grooves is formed substantially in parallel, and both end portions of the upper spring pin slide in each of the sliding grooves. Circuit breaker.   The circuit breaker according to any one of claims 1 to 5, wherein a roller is fitted into an outer periphery of the upper spring pin to slide the sliding groove.   7. The guide plate according to claim 2, wherein a guide piece that protrudes between the pair of frame plates and suppresses a displacement of a link component inserted between the pair of frame plates is provided on the frame plate. 8. Circuit breaker described in.   2. The circuit breaker according to claim 1, wherein the upper link holds the lower spring pin with a through hole formed in the U-bend portion. 2. The circuit breaker according to claim 1, further comprising a lower link having one end connected to the upper link and the other end connected to the connect link.

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