JPH0577846U - Overcurrent relay - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide an overcurrent relay that can temporarily fix the frame to the body. A reversing mechanism portion 51 including a thermal element, a second reversing plate 55 that interlocks with a first reversing plate 54 through a reversing spring 56, and a frame 52 to which these are mounted, a contact device,
A body for accommodating the operation member and the reset button from the opening surface is provided with an isolation wall for isolating the thermal element and the reversing mechanism portion, and an insertion hole 13 into which the frame is inserted. The first and second pressing portions 53b and 53c that come into contact with the frame are provided from the bottom piece 53a interposed between the inserted insertion piece 52a and the bottom surface 13a of the insertion hole, and the insertion hole is provided between the first and second pressing portions. An elastic supporting member 53, which has a pressing support portion that abuts against the side surface 13b of the second pressing portion and has a stronger pressing force than the first pressing portion, is inserted into the insertion hole together with the insertion piece of the frame.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an overcurrent relay in which a contact device is driven by a thermal element that is displaced according to the amount of electricity supplied.

[0002]

[Prior Art]

 As a general overcurrent relay of this type, there is a configuration shown in FIG. In the figure, reference numeral 51 denotes a reversing mechanism, which attaches a first reversing plate 54 and a second reversing plate 55 to a frame 52 via a coil spring 56. The frame 52 includes an insertion piece 52a to be inserted into the insertion hole 13 formed in the body 10 and arm pieces 52b and 52c having substantially V-shaped notch grooves 52d and 52e. The first reversing plate 54 and the second reversing plate 55 have their other ends swingable in the thickness direction of the frame 52 by inserting their one ends into the cutout grooves 52d and 52e of the frame 52, respectively. Is supported. Further, the notch grooves 52d and 52e are opened so as to be separated from each other, and a tensile force is applied between the first reversing plate 54 and the second reversing plate 55 through a reversing spring 56, so that the frame 52 It is supposed to be held in.

To insert the frame 52 into the insertion hole 13 of the body 10, first, as shown in FIG. 14A, a Z-shaped elastic supporting member 53 having a pressing portion 53c provided at one position. Is inserted into the insertion hole 13. Then, the frame 52 is held by a press-fitting jig (not shown), and the insertion piece 52a of the frame 52 is press-fitted between the elastic support member 53 and the insertion hole 13 as shown in FIG. 14 (b). Insert.

[0004]

[Problems to be solved by the device]

 For the above-mentioned overcurrent relay, the method of inserting the frame into the insertion hole of the body is to insert a Z-shaped elastic support member with a pressing portion at one place into the insertion hole, and insert the frame insertion piece. Since the frame was inserted by being press-fitted between the elastic support member and the insertion hole, the frame could not be directly and temporarily inserted (temporarily fixed) into the insertion hole of the body. For this reason, since the frame 52 is held by the press-fitting jig and is inserted by being press-fitted between the insertion hole and the elastic support member, the press-fitting jig needs to be inserted with high accuracy.

The present invention has been made in view of the above problems, and an object of the present invention is to insert a press-fitting jig by temporarily temporarily inserting (temporarily fixing) a frame into an insertion hole of a body. An object of the present invention is to provide an overcurrent relay that can insert a frame into an insertion hole even if the attachment accuracy changes slightly.

[0006]

[Means for Solving the Problems]

 The overcurrent relay according to claim 1, wherein the thermal element is displaced according to the amount of energization, the actuating plate is actuated according to the displacement of the thermal element, and the first counteracting member receives a pressing force from the actuating plate. The second reversing plate is composed of a revolving plate, a second reversing plate that interlocks with the first reversing plate via a reversing spring, and a frame to which the first and second reversing plates are swingably attached. When the plate is located at one stable position, the first reversing plate receives a pressing force from the actuating plate that operates with the displacement of the thermal element, and the center line of the reversing spring is at the second reversing plate. And a reversing mechanism section configured so that the second reversing plate rapidly moves to the other stable position when a straight line connecting the connecting part with the reversing spring and the fulcrum of the second reversing plate with respect to the frame is crossed, It is composed of a movable contact and a fixed contact that open and close as the second reversing plate swings. The contact device, the operating member that applies a pressing force to the movable contact according to the swing of the second reversing plate, and the opening and closing of the contact device when the opened and closed state of the contact device is reversed due to the displacement of the thermal element. A body for accommodating a reset button for returning the state to the initial open / closed state from an opening surface is provided with an isolation wall for isolating the thermal element and the reversing mechanism section, and an insertion hole for inserting the frame is formed. In the overcurrent relay in which the opening surface of the body is closed by a closing plate, an insertion piece to be inserted into the insertion hole is formed in the frame, and the space between the insertion piece and the bottom surface of the insertion hole is formed. A first pressing portion on the opening side and a second pressing portion on the bottom surface side, which come into contact with the frame from a bottom piece interposed in between, are provided, and the second pressing portion is an elastic support member having a stronger pressing force than the first pressing portion. Configuration that is inserted into the insertion hole together with the frame insertion piece Are you.

According to a second aspect of the present invention, an overcurrent relay is provided with a pressing support portion that abuts a side surface of the insertion hole between the first pressing portion and the second pressing portion of the elastic supporting member according to the first aspect. It is configured.

[0008]

[Action]

 According to the configuration of claim 1, the insertion piece to be inserted into the insertion hole is formed on the frame, and the bottom piece interposed between the insertion piece and the bottom surface of the insertion hole is provided on the opening side that abuts on the frame. Since the first pressing portion and the second pressing portion on the bottom side are provided, and the elastic supporting member, which has a stronger pressing force than the first pressing portion, is inserted into the insertion hole together with the frame, It can be temporarily inserted (temporarily fixed) in the insertion hole.

According to the configuration of claim 2, since the pressing support portion that abuts the side surface of the insertion hole is provided between the first pressing portion and the second pressing portion of the elastic supporting member, in addition to the above-described action. , The frame can be firmly inserted into the insertion hole.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. The members having the same basic functions as those of the conventional example are designated by the same reference numerals.

That is, as shown in FIG. 2, the overcurrent relay includes a body 10 having an opening on one side, a cover 20 (closure plate) that closes the opening of the body 10, and a body 10 that covers a part of the body 10. It is configured by an inner lid 30 interposed between the disk 10 and the cover 20.

As shown in FIG. 3, the inside of the body 10 is largely divided into three sections 11 A, 11 B, and 11 C by a partition wall 11. The second section 11B is formed over substantially the entire length of one side portion of the body 10 in the upward and downward direction, and the first section 11A and the third section 11C are arranged above and below the body 10.

The first compartment 11A is further divided into three chambers by a partition wall 11 formed substantially parallel to each other, and the thermal element 40 is housed in each of the other two chambers except the central chamber. A slit 11a is formed in each of the isolation wall 11 that divides the first compartment 11A into three chambers and the isolation wall 11 that separates the first compartment 11A from the second compartment 11B at a position corresponding to one end of the bimetal 40. The interlocking plate 12 is arranged so as to be movable in the direction orthogonal to the opening surface of the slit 11a. The interlocking plate 12 is formed in a substantially E shape in which three leg pieces 12a are integrally connected via a connecting piece 12b, and when at least one bimetal 40 is deformed, the leg pieces 12a are pressed and the interlocking plate 12 is formed. The amount of protrusion of one end of the above into the second section 11B is increased. A pushing piece 12c is provided in a protruding manner on the leg piece 12a protruding into the second section 11B. Further, the interlocking plate 12 has a play in the moving direction with respect to the bimetal 40, and when one bimetal 40 is deformed, it can be moved without deforming the other bimetal 40.

The second section 11B has an insertion hole 13 (see FIG. 6) into which a frame described later is inserted. The insertion hole 13 has one side wall replaced by the isolation wall 11, the outer shape of which is formed into a rectangular parallelepiped shape, and the bottom surface 13a is flat. Further, the trip device 50 is housed in this section 11B. As shown in FIG. 1, the trip device 50 includes a reversing mechanism section 51 and an operating point adjusting mechanism section 57.

The reversing mechanism 51 includes a frame 52 inserted into the insertion hole 13 of the body 10, an elastic support member 53 inserting the frame 52 into the insertion hole 13 of the body 10, and first and second frames. The reversing plates 54 and 55 and the reversing spring 56 that connects the first and second reversing plates 54 and 55. The frame 52 includes an insertion piece 52a to be inserted into the insertion hole 13 formed in the body 10 and arm pieces 52b and 52c having substantially V-shaped notch grooves 52d and 52e. The cutout grooves 52d and 52e are open in directions away from each other. The elastic support member 53 is formed by bending an elastic metal plate into a W shape and is in contact with the bottom surface 13a of the insertion hole 13, and the first and second pressing portions 53b and 53c that press the frame 52. And a pressing support portion 53d provided between the first and second pressing portions 53b and 53c and contacting the side surface 13b of the insertion hole 13, and an insertion hole provided between the bottom piece 53a and the second pressing portion 53c. And a base end support portion 53e that comes into contact with the side surface 13b of the reference numeral 13. The first and second pressing portions 53b, 53c are formed such that the pressing portion 53b side closer to the bottom surface 13a of the insertion hole 13 has a stronger pressing force than the opening side pressing portion 53c side. The first reversing plate 54 and the second reversing plate 55 have hooking portions 54a and 55a for hooking in the notch grooves 52d and 52e of the frame 52, and hooking holes 54b and 55b for hooking reversing springs, which will be described later. have. The reversing spring 56 has ring-shaped hook portions 56a, 56a at both ends. To attach these to the frame 52, the hook portions 56a and 56a of the reversing spring 56 are hooked on the hook holes 54b and 55b of the first and second reversing plates 54 and 55, respectively, and then the first reversing plate 54 By inserting the hooking portions 54a and 55a of the second reversing plate 55 into the notch grooves 52d and 52e of the frame 52, the pulling force holds the frame 54 by the frame 52.

The method of inserting the reversing mechanism portion 51 into the insertion hole 13 of the body 10 is as follows. First, as shown in FIG. 4A, the bottom piece 53 a of the elastic support member 53 is the bottom surface of the insertion hole 13 of the body 10. The elastic support member 53 is inserted into the insertion hole 13 of the body 10 until it comes into contact with 13a. Then, as shown in FIG. 4B, the insertion piece 52a of the frame 52 is inserted between the elastic support member 53 and the isolation wall 11 of the body 10 until it abuts on the second pressing portion 53c of the elastic support member 53. , Temporarily fix. Finally, as shown in FIG. 4C, the tip of the insertion piece 52a of the frame 52 is brought into contact with the bottom piece 53a of the elastic support member 53 by using a press-fitting jig (not shown) in this temporarily fixed state. The frame 52 is inserted into the mounting hole 13 until it is inserted, and the frame 52 is inserted into the insertion hole 13. Moreover, the angle δ between the first pressing portion 53b and the second pressing portion 53c increases in the order of (a) <(b) <(c) in FIG. This is because when the insertion piece 52a of the frame 52 is inserted between the insertion hole 13 and the elastic support member 53, the second pressing portion 53c is pressed toward the side surface b of the insertion hole 13. In this way, as the angle δ between the first pressing portion 53b and the second pressing portion 53c increases, the pressing force of the first pressing portion becomes larger when the frame 52 is inserted and attached than in the temporarily fixed (temporary insertion) state. It becomes stronger, and pressing with two pressing parts allows firmer insertion than pressing with one pressing part.

The operating point adjusting mechanism 57 includes a rotary lever 58 rotatably attached to a shaft protrusion 14 projecting in a direction orthogonal to the bottom wall with respect to the body 10, and a rotary lever 58. It is composed of an operating plate 59 which is swingably held against it, and an operating point adjustment cam 60 which is rotatably attached to the peripheral wall of the body 10. The rotating lever 58 has a substantially U-shaped lever body 58c in which a pair of parallel leg pieces 58a are connected to each other via a pair of connecting pieces 58b. A substantially receiving hole 58d to be inserted is formed, and a bearing recess 58e that abuts the peripheral surface of the shaft protrusion 14 is formed in the other leg piece 58a. One connecting piece 58b of the lever body 58 is substantially T-shaped, and a holding piece 58f is formed in a shape substantially orthogonal to the T-shaped leg portion, and the operating plate 59 can be rocked on the holding piece 58f. A holding hole 58g for holding is formed. As shown in FIG. 7, the holding hole 58g has a substantially rectangular shape, and has a holding recess 58h formed on one side of the connecting piece 58b. Further, a holding protrusion 58i is provided so as to protrude from the inner peripheral edge of the holding hole 58g so as to face the holding recess 58h. The leg piece 58a provided with the bearing hole 58d extends to the side opposite to the holding piece 58f with respect to the bearing hole 58d, and the tip of this leg piece 58a has an adjusting piece in the same plane as the connecting piece 58b. 58j is formed.

The operating plate 59 has cutout grooves 59a on both side edges of the intermediate portion. The operating plate 59 is inserted into the holding hole 58g of the rotating lever 58, and both side peripheral portions of the holding concave portion 58h of the holding hole 58g are fitted into the notch grooves 59a. That is, the movement of the operating plate 59 in the longitudinal direction and the width direction is restricted by fitting a part of the operating plate 59 into the holding recess 58h. In order to restrict the movement of the operating plate 59 in the thickness direction, the distance between the bottom surface of the holding recess 58h and the tip surface of the holding protrusion 58i is set to be slightly larger than the thickness of the operating plate 59 as shown in FIG. 8), the working plate 59 is inserted into the holding hole 58g, and as shown in FIG. 8B, one side of the peripheral portion of the holding hole 58g provided with the holding protrusion 58i is plastically deformed by a method such as tapping. Let Here, as shown in FIG. 9, the swing range θ of the operating plate 59 with respect to the rotating lever 58 is restricted by the distance between the bottom surface of the holding recess 58h and the holding projection 58i. That is, as shown in FIG. 10, the operating plate 59 swings only in the range corresponding to the gap between the bottom surface of the holding recess 58h and the tip surface of the holding projection 58i. One end of the operating plate 59 is arranged at a position where it can come into contact with the interlocking plate 12. That is, when the interlocking plate 12 moves due to the deformation of the thermal element 40, the operating plate 59 is pressed by the interlocking plate 12 and rotates about the holding hole 58g, and presses the first reversing plate 54 toward the frame 52. Of.

As shown in FIG. 3, the operating point adjusting cam 60 includes a columnar leg portion 60a, a flange portion 60b provided at one end of the leg portion 60a, and a cam protruding from the other end of the leg portion 60a. It has a protrusion 60c. The leg portion 60a is inserted into a through hole 11a formed in the peripheral wall of the body 10, and the flange portion 60b abuts the outer surface of the body 10. A cross-shaped driver groove 60f is formed in the center of the portion of the operating point adjustment cam 60 exposed on the outer surface of the body 10 so that the tip of a plus driver or the like can be inserted. A protective wall 15b surrounding the peripheral edge of the flange portion 60b is formed on the outer surface of the peripheral wall of the body 10, so that the operating point adjusting cam 60 is prevented from rotating carelessly when another member touches the outer peripheral edge of the flange portion 60b. To prevent. A groove portion 60d is formed on the peripheral surface of the leg portion 60a over the entire length, and a holding spring 60e is mounted between the leg portion 60a and the holding groove 15c formed on the inner peripheral surface of the peripheral wall of the body 10. In addition, the body 10 is formed with a holding wall 15d, which is in contact with the holding spring 60e, with which the leg portion 60a abuts, and the leg 60a is sandwiched between the holding spring 60e and the holding wall 15d to operate the operating point. The adjustment cam 60 is prevented from coming off the body 10.

The cam projection 60c is provided eccentrically with respect to the rotation center of the leg 60a at a position where the adjusting piece 58j of the rotating lever 58 can come into contact. Therefore, by rotating the operating point adjustment cam 60, the rotation range of the rotation lever 58 around the shaft protrusion 14 can be adjusted. Further, since the swing range of the operating plate 59 with respect to the rotating lever 58 is restricted, when the first reversing plate 54 receives a pressing force from the operating plate 59 by rotating the operating point adjusting cam 60. The amount of deformation of the thermal element 40 can be changed. That is, when the interlocking plate 12 moves due to the deformation of the thermal element 40, the operating plate 59 is pressed, but until the adjusting piece 58j of the rotating lever 58 abuts the cam projection 60c, the operating plate 59 is removed from the interlocking plate 12. The pressing force received rotates the rotating lever 58 (rotates clockwise in FIG. 5) and does not act on the first reversing plate 54 of the reversing mechanism 51. On the other hand, when the adjusting piece 58j of the rotating lever 58 comes into contact with the cam projection 60c, the rotating lever 58 cannot rotate, so that the pressing force acting on the operating plate 59 from the interlocking plate 12 is transmitted to the first reversing plate 54. It is. With such a configuration, the amount of deformation of the thermal element 40 required to invert to the trip position when the reversing mechanism 51 is in the reset position can be adjusted by the rotational position of the operating point adjustment cam 60. Of.

The contact device 70 is arranged across the second section 11B and the third section 11C, and has a pair of movable spring plates 71, 72 and a pair of fixed spring plates 71, 72 respectively corresponding to the movable spring plates 71, 72. The spring plates 73 and 74 are provided. The movable spring plates 71, 72 are connected to the second reversing plate 55 of the reversing mechanism unit 51 via an operating member 80 made of insulating synthetic resin.

As shown in FIGS. 11 and 12, the operating member 80 is slidably arranged so that both ends thereof are inserted into the slits 11b and 11c formed in the isolation wall 11, and the operation member 80 is slidable through the slit 11b to the second position. It is arranged so as to straddle the section 11B and the third section 11C. A notch groove 81 with which the second reversing plate 55 engages and a notch groove 82 with which one of the movable spring plates 71 engages are formed at one end of the operating member 80 inserted into the second section 11B. To be done. Further, a wide cutout groove 83 through which the movable spring plate 72 is inserted is formed in a portion of the operating member 80 arranged in the third section 11C. Stopper projections 84 and 85, which can abut against the peripheral portions of the slits 11b and 11c, are provided on both peripheral portions of the wide cutout groove 83 in the sliding direction of the operating member 80. The movement range of the operating member 80 is regulated by abutting on one of the peripheral edges.

The reset button 90 has an inclined surface 92 formed at the tip of its leg portion 91. There are two ways to use this reset button 90.When the overcurrent relay trips due to the displacement of the thermal element 40, the reset button 90 is pushed into the body 1 side to open the contact device 70 in the initial open / closed state. It is used as a simple manual reset button, and the reset button 90 is pushed into the body 1 side in advance and locked, and the second reversing plate of the reciprocating mechanism portion 51 is displaced by the displacement of the thermal element 40. There is a method of using as an automatic return stopper that reverses the open / closed state of the contact device 70 when the displacement of the thermal element 40 returns even if 55 moves and the open / closed state of the contact device 70 reverses. That is, the position of the reset button 90 used as the manual reset button is such that the inclined surface 92 is inclined in the sliding direction of the operation member 80, and the stopper projection 85 side of the operation member 80 is projected more than the stopper projection 84 side. Incline. Further, the position of the reset button 90 used as the automatic return stopper is such that the inclined surface 92 is substantially orthogonal to the sliding direction of the operation member 80. By the way, when the reset button 90 is used as a stopper for automatic return, as shown in FIG. 12, when the reversing mechanism 51 is about to trip due to the displacement of the thermal element 40, the stopper projection 84 of the operating member 80 is reset. The contact of the leg portion 91 of the button 90 restricts the position of the operation member 80 so as not to trip, and when the displacement of the thermal element 40 returns, the contact device 70 is returned to the initial open / closed state. There is.

Next, the operating principle of the reversing mechanism portion 51 will be described based on the configuration of this embodiment. When the tip of the second reversing plate 55 of the reversing mechanism portion 51 is moved in the thickness direction of the frame 52 in the direction away from the frame 52, the tip of the second reversing plate 55 is rapidly moved from the frame 52. The spring force of the reversing spring 56 acts in the direction of separating. Therefore, the tip of the second reversing plate 55 is held at a position apart from the frame 52 in the thickness direction of the frame 52 (hereinafter, this position is referred to as a reset position). The spring force of the reversing spring 56 acts such that the center line of the reversing spring 56 connects the connecting portion of the second reversing plate 55 with the reversing panel 56 and the fulcrum of the second reversing plate 55 with respect to the frame 52. It is when it comes to the position on the opposite side of the frame 52 across the straight line. When the tip of the second reversing plate 55 is separated from the frame 52 in the thickness direction of the frame 52, when the first reversing plate 54 is pressed toward the frame 52, the second reversing plate 55 is pressed. The spring force of the reversing spring 56 acts in such a direction that the tip end of the spring rapidly approaches the frame 52. That is, the tip of the second reversing plate 55 is held at a position close to the frame 52 in the thickness direction of the frame 52 (hereinafter, this position is referred to as a trip position). The spring force of the reversing vane 56 acts so that the center line of the reversing spring 56 connects the connecting portion of the second reversing plate 55 with the reversing spring and the fulcrum of the second reversing plate 55 with respect to the frame 52. It's time to cross the straight line and get closer to the frame 52. When the reversing mechanism 51 is at the reset position and the operating member 80 is moved to the second section 11B side in the sliding direction, the movable spring plate 71 contacts the fixed plate 73, and the movable spring plate 72 has the cutout groove 83. Is pressed against the peripheral edge of the fixing plate 74 and separated from the fixing plate 74. Further, when the reversing mechanism portion 51 is at the trip position and the operating member 80 has moved to the side of the third section 11C in the sliding direction, the movable spring plate 72 contacts the fixed plate 74, and the movable spring plate 71 is notched. The groove 82 is pressed against the peripheral edge of the groove 82 and separated from the fixed plate 73. In short, the open and closed states are opposite to the fixed plates 73 and 74 corresponding to the movable spring plates 71 and 72.

In this embodiment, the elastic support member is simply a member for mounting the frame, but if the elastic support member is formed so as to extend the tip of the elastic support member and contact the back surface of the first reversing plate, If the overcurrent relay trips, the second reversing plate can be used as a bias spring that returns to the other stable position beyond the centerline of the reversing spring. Further, the elastic support member may have the bottom piece directly fixed to the insertion hole as long as it has at least two pressing portions in the insertion direction of the insertion hole of the body. Furthermore, the elastic supporting member does not have to be formed in a W shape, and can be applied as long as the pressing portion is provided in two or more places.

[0026]

[Effect of the device]

 In the overcurrent relay according to claim 1, an insertion piece to be inserted into the insertion hole is formed on the frame, and a bottom piece interposed between the insertion piece and the bottom surface of the insertion hole is provided on the opening side to contact the frame. Since the first pressing part and the second pressing part on the bottom surface are provided, and the elastic supporting member, which has a stronger pressing force than the first pressing part, is inserted into the insertion hole together with the frame, the frame is inserted into the insertion hole. The frame can be inserted into the insertion hole even if the insertion accuracy of the press-fitting jig changes slightly.

According to the second aspect of the invention, since the pressing support portion that comes into contact with the side surface of the insertion hole is provided between the first pressing portion and the second pressing portion of the elastic support member, in addition to the above-described action. , The frame can be firmly inserted into the insertion hole.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a trip device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the overcurrent relay with a cover removed.

FIG. 3 is an exploded perspective view of FIG.

FIG. 4 is an explanatory view of inserting the trip device of FIG. 1 into a body.

5 is a front view showing a state in which the inner lid of FIG. 2 is removed.

FIG. 6 is a side sectional view showing a state in which an inner lid and a cover are attached to FIG.

FIG. 7 is an exploded perspective view of the actuation plate of FIG.

FIG. 8 is an explanatory view showing an assembling process of the operating plate of FIG.

9 is an operation explanatory view of a state where the operation plate of FIG. 7 is attached to a rotary lever.

FIG. 10 is a diagram for explaining the operation near the rotary lever holding hole in FIG.

11 is a cross-sectional view of FIG.

FIG. 12 is an operation explanatory view of the automatic return mechanism of FIG.

FIG. 13 is an exploded perspective view showing a conventional reversing mechanism section.

14 is an explanatory view of inserting the reversing mechanism portion of FIG. 13 into a body.

[Explanation of symbols]

 10 Body 11 Isolation wall 13 Insertion hole 40 Thermal element 50 Trip device 51 Inversion mechanism part 52 Frame 52a Frame insertion piece 53 Elastic support member 53a Elastic support member bottom piece 53b Elastic support member first pressing portion 53c Elastic support member Second pressing part 53d Pressing support part of elastic support member 53e Base end support part of elastic support member 54 First reversing plate 55 Second reversing plate 56 Reversing spring 59 Operating plate 60 Operating point adjusting cam 70 Contact device 80 Operating member 90 Reset button

Claims (2)

[Scope of utility model registration request] 1. A thermal element that is displaced according to the amount of energization, an actuating plate that operates with the displacement of the thermal element, a first reversing plate that receives a pressing force from the actuating plate, and the first reversing plate. The second reversing plate that interlocks with the first reversing plate via the reversing spring and the first reversing plate.
And a second reversing plate each being swingably attached to the frame. When the second reversing plate is positioned at one stable position, the first reversing plate moves with the displacement of the thermal element. When the center line of the reversing spring crosses a straight line connecting the connecting portion of the second reversing plate with the reversing spring and the fulcrum of the second reversing plate with respect to the frame, the second line is received. A reversing mechanism portion configured to rapidly move the reversing plate to the other stable position, and a contact device including a movable contact and a fixed contact that opens and closes in accordance with the swing of the second reversing plate. When the open / closed state of the contact device is reversed by the displacement of the operation member and the operation member that applies a pressing force to the movable contact according to the swing of the second reversing plate, the open / closed state of the contact device is initialized. In the body that stores the reset button that returns to the open and closed state from the opening surface In an overcurrent relay in which an isolation wall for isolating the thermal element and the reversing mechanism portion is provided, an insertion hole for inserting the frame is formed, and an opening surface of the body is closed by a closing plate, the insertion hole is provided. An insert piece to be inserted into the frame is formed on the frame, and a bottom piece interposed between the insert piece and the bottom surface of the insertion hole is provided with a first pressing portion on the opening side and a second pressing portion on the bottom surface that are in contact with the frame. And an elastic support member, in which the second pressing portion has a stronger pressing force than the first pressing portion, is inserted into the insertion hole together with the insertion piece of the frame. 2. The elastic supporting member includes a first pressing portion and a second pressing portion.
The overcurrent relay according to claim 1, further comprising a pressing support portion that abuts a side surface of the insertion hole between the pressing portion and the pressing portion.