JPH0579852U - Overcurrent relay - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Adjusting the reversal position of the second reversing plate of the reversing mechanism allows the opening and closing state of the contact device to be initially opened and closed without changing the operating member. Providing an overcurrent relay that can automatically return to the state. [Structure] A thermal element 4 which is displaced in accordance with the amount of energization, and a first reversing plate 52 and a second reversing plate which are swingably held with respect to a frame 51 fixed at a fixed position of a body 1. Inversion mechanism 5 in which 53 is connected by an inversion spring 55
And a contact device 6 composed of a movable contact and a fixed contact that opens and closes as the second reversing plate swings, and an operating member 7 that applies a pressing force to the movable contact according to the swinging of the second reversing plate. And a reset button 8 for returning the opened / closed state of the contact device to the initial opened / closed state, and an inversion position adjusting screw 54 having a groove that can freely move back and forth in the swinging direction is inserted into the second inversion plate. The reversing spring was locked to the reversing position adjusting screw and connected to the first reversing plate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD 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 energization.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 5, the housing of this type of overcurrent relay has a body 1 having an opening on one side, a cover 2 for closing the opening of the body 1, and a body 1 partly covering the body 1. 1 and an inner lid 3 interposed between the cover 2 and the cover 2.

As shown in FIG. 6, the inside of the body 1 is a thermal element 4 that is displaced according to the amount of energization, and an inversion mechanism that trips the overcurrent relay when the displacement of the thermal element 4 exceeds a certain amount. Part 5, a contact device 6 that opens and closes by the pressing force of the reversing mechanism part 5, an operating member 7 that applies the pressing force of the reversing mechanism part 5 to the contact device 6, and when the open / closed state of the contact device 6 reverses. The reset button 8 is used to return the contact device 6 to the initial open / close state via the operation member 7. The reversing mechanism section 5 includes a first reversing plate 52 and a second reversing plate 53, which are held swingably with respect to a frame 51 fixed at a fixed position of the body 1, via a reversing spring 55. When the second reversing plate 53 is positioned in one of the stable positions in conjunction with each other, the first reversing plate 52 receives a pressing force from the operating plate 57 that operates in accordance with the displacement of the thermal element 4, When the center line of the reversing spring 55 exceeds a straight line connecting the connecting portion of the second reversing plate 53 with the reversing spring 55 and the fulcrum of the second reversing plate 53 to the frame 51, the second reversing plate 53 is It is configured to move rapidly to the other stable position.

There are two ways to use the reset button 8, and when the overcurrent relay trips due to displacement of the thermal element 4, the reset button 8 is pushed toward the body 1 side to open and close the contact device 6 for the initial time. It is used as a simple manual reset button for returning to the state, and the reset button 8 is pushed into the body 1 side in advance and locked, and the second reversing plate 53 of the reversing mechanism portion 5 is displaced by the displacement of the thermal element 4. There is a method of using as an automatic return stopper that reverses the open / closed state of the contact device 6 when the displacement of the thermal element 4 returns even if the open / closed state of the contact device 6 is reversed. That is, when used as an automatic return stopper, as shown in FIG. 7, when the reversing mechanism portion 5 tries to trip due to the displacement of the thermal element 4, the stopper protrusion 74 of the operating member 7 is attached to the leg of the reset button 8. The position of the operating member 7 is regulated so as not to trip due to the contact of the portion 81, and when the displacement of the thermal element 4 returns, the contact device 6 is returned to the initial open / closed state.

[0005]

[Problems to be solved by the device]

 However, in the conventional case, when the reset button is used as a stopper for automatic return, the dimensional error of the hinges of the first and second reversing plates of the reversing mechanism and the movable spring plate of the normally open and normally closed contacts are used. In some cases, automatic recovery may not be possible due to variations in tensile load or deformation of the body itself.Therefore, some types of dimensional differences in operating members were manufactured, and the operating members were reassembled for automatic recovery. There was a costly problem.

An object of the present invention is to solve the above-mentioned problems, and by adjusting the reversing position of the second reversing plate of the reversing mechanism section, the contact point can be adjusted without changing the operating member. It is intended to provide an overcurrent relay that can automatically restore the open / closed state of the device to the initial open / closed state.

[0007]

[Means for Solving the Problems]

 In the present invention, in order to achieve the above object, a thermal element that is displaced in accordance with the amount of energization, a first reversing plate that is swingably held with respect to a frame fixed at a fixed position of a body, and When the second reversing plate is interlocked via a reversing spring and the second reversing plate is located at one stable position, the first reversing plate operates from the actuating plate along with the displacement of the thermal element. When the center line of the reversing spring exceeds the straight line connecting the connecting portion of the second reversing plate with the reversing spring and the fulcrum of the second reversing plate to the frame under the pressing force of, A reversing mechanism portion configured to move rapidly to a stable position, a contact device including a movable contact and a fixed contact that opens and closes with the swing of the second reversing plate, and the second The operating member that applies a pressing force to the movable contact according to the swing of the reversing plate and the heat In the case of the overcurrent relay having a reset button for returning the open / closed state of the contact device to the initial open / closed state when the open / closed state of the contact device is reversed due to the displacement of the moving element, the second reversal mechanism of the reversing mechanism section is provided. The reverse position adjusting screw having a groove is inserted into the plate, and the reverse spring is locked in the groove of the reverse position adjusting screw.

[0008]

[Action]

 According to the above configuration, since the reversal position adjusting screw having the groove is inserted into the second reversing plate of the reversing mechanism portion and the reversing spring is locked in the groove of the reversing position adjusting screw, By adjusting the screwing amount and changing the pulling position of the reversing spring, the moving amount of the second reversing plate of the reversing mechanism from the initial stable position to over the center line of the reversing spring can be adjusted.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 3, the body 1 is divided into three sections 12 A, 12 B, 12 C by a partition wall 12 inside. The second section 12B is formed over substantially the entire length of one side portion of the body 1 in the vertical direction, and the first section 12A and the third section 12C are arranged above and below the body 1.

The first compartment 12A is further divided into three chambers by a partition wall 12 formed substantially in parallel, and the heat-generating element 4 is housed in each of the other two chambers except the central chamber.

As shown in FIGS. 1 and 3, the reversing mechanism portion 5 is accommodated in the second compartment 12 B and is fixed to the body 1 with respect to the frame 51, the first reversing plate 52 and the second reversing plate. 53 is swingably attached, and the reverse position adjusting screw 54 having the groove 54a is inserted into the first reverse plate 52 and the second reverse plate 53, and the coil spring is inserted into the groove 54a of the reverse position adjusting screw 54. Are connected via a reversing spring 55 which is a tension spring. One end of the frame 51 is inserted into a press-fitting piece 51a which is press-fitted into a mounting hole (not shown) formed in the body 1 and arm pieces 51b and 51c having substantially V-shaped notch grooves 51d and 51e. As a result, the other end of the frame 51 is supported so as to be swingable in the thickness direction. Further, the notch grooves 51d and 51e are opened so as to be separated from each other, and are held on the frame 51 by applying a tensile force between the first reversing plate 52 and the second reversing plate 53 via a reversing spring 55. It is supposed to be done. The reversing spring 55 has ring-shaped hook portions 55a at both ends, and is fitted in the hook holes 52a of the first reversing plate 52 and the groove 54a of the reversing position adjusting screw 54 screwed into the second reversing plate 53. It is hooked and connected. As for the reversal position adjusting screw 54, the reversal spring 55 is separated from the second reversal plate 53 as shown in FIG. 2A, and the reversal spring 55 is arranged as the second reversal plate as shown in FIG. 2B. The screwing amount with respect to the second reversing plate 53 can be adjusted between the position where it abuts against 53. Reference numeral 56 denotes a rotary lever rotatably attached to a shaft projection 13 projecting from the body 1 in a direction orthogonal to the bottom wall, and 57 is swingably held by the rotary lever 56. It is a working plate.

The contact device 6 is disposed across the second section 12B and the third section 12C, and has a pair of movable spring plates 61, 62 and a pair of fixed spring plates 61, 62 respectively. The plates 63 and 64 are provided. The movable spring plates 61 and 62 are connected to the second reversing plate 53 of the reversing mechanism 5 via the operating member 7 made of an insulating synthetic resin.

As shown in FIGS. 3 and 4, the operating member 7 is slidably arranged so that both ends thereof are inserted into slits 12 a and 12 b formed in the partition wall 12, and is slidably attached to the slit 12 a through the slit 12 a. It is arranged so as to straddle the section 12B and the third section 12C. A notch groove 71 with which the second reversing plate 53 engages and a notch groove 72 with which one of the movable spring plates 61 engages are formed at one end of the operating member 7 that is inserted into the second section 12B. To be done. Further, a wide cutout groove 73 through which the movable spring plate 62 is inserted is formed in a portion of the operating member 7 which is arranged in the third section 12C. Stopper protrusions 74 and 75 that can come into contact with the peripheral portions of the slits 12a and 12b are provided on both peripheral portions of the wide cutout groove 73 in the sliding direction of the operating member 7 to move the operating member 7. At this time, one of the stopper protrusions 74, 75 is provided on the peripheral edge of the corresponding slit 12a, 12c so that the movement range of the operating member 7 is restricted.

The reset button 8 has an inclined surface 82 formed at the tip of a leg 81 thereof. The inclined surface 82 is inclined in the sliding direction of the operating member 7 at the manual reset position, and is inclined so that the stopper projection 75 side of the operating member 7 projects more than the stopper projection 74 side. At the automatic reset position, the operation member 7 is inclined in a direction substantially orthogonal to the sliding direction.

Next, the operation principle of the reversing mechanism section 5 will be described based on the configuration of the present embodiment. When the tip of the second reversing plate 53 of the reversing mechanism portion 5 is moved in the thickness direction of the frame 51 in a direction away from the frame 51, the tip of the second reversing plate 53 rapidly moves from the frame 51. The spring force of the reversing spring 55 acts in the direction of separating. Therefore, the tip portion of the second reversing plate 53 is held at a position apart from the frame 51 in the thickness direction of the frame 51 (hereinafter, this position is referred to as a reset position). The spring force of the reversing spring 55 acts because the center line of the reversing spring 55 is the connecting portion of the reversing position adjusting screw 54 of the second reversing plate 53 with the reversing spring 55 and the frame of the second reversing plate 53. It is when it comes to be located on the opposite side of the frame 51 beyond the straight line connecting the fulcrum to 51. When the tip of the second reversing plate 53 is separated from the frame 51 in the thickness direction of the frame 51, when the first reversing plate 52 is pressed toward the frame 51, the second reversing plate 53 is pressed. The spring force of the reversing spring 55 acts in such a direction that the tip end of the reversing spring rapidly approaches the frame 51. That is, the tip of the second reversing plate 53 is held at a position close to the frame 51 in the thickness direction of the frame 51 (hereinafter, this position is referred to as a trip position). The spring force of the reversing spring 55 acts because the center line of the reversing spring 55 is the connecting portion of the reversing position adjusting screw 54 of the second reversing plate 53 with the reversing spring 55 and the frame of the second reversing plate 53. It is when it comes to the position closer to the frame 51 beyond the straight line connecting the fulcrum to 51. At the position where the reversing mechanism section 5 is at the reset position and the operating member 7 has moved to the second section 12B side in the sliding direction, the movable spring plate 61 contacts the fixed plate 63, and the movable spring plate 62 has the cutout groove 73. It is pressed against the peripheral edge of and is separated from the fixing plate 64. Further, when the reversing mechanism portion 5 is at the trip position and the operating member 7 is moved to the third section 12C side in the sliding direction, the movable spring plate 62 contacts the fixed plate 64 and the movable spring plate 61 is notched. The groove 72 is pressed against the peripheral edge of the groove 72 and separated from the fixed plate 63. In short, the open and closed states of the fixed plates 63 and 64 corresponding to the movable spring plates 61 and 62 are opposite to each other.

[0017]

[Effect of the device]

 As described above, the present invention adjusts the movement amount of the second reversing plate from the initial stable position to beyond the center line of the reversing spring, so that the overcurrent relay can be operated without changing the operating member. Even if a trip occurs, when the displacement of the thermal element returns, the automatic return mechanism of the overcurrent relay that returns the open / closed state of the contact device to the initial open / closed state can be adjusted.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a reversing mechanism portion of an embodiment.

FIG. 2 is an operation explanatory view of the reversing mechanism portion of the embodiment.

FIG. 3 is an exploded perspective view of the embodiment.

FIG. 4 is a cross-sectional view of an example.

FIG. 5 is a conventional exploded perspective view.

FIG. 6 is a rear view showing a state in which a conventional cover and an inner lid are removed.

FIG. 7 is an operation explanatory view of a conventional automatic return mechanism.

[Explanation of symbols]

 1 Body 2 Cover 3 Inner Lid 4 Thermoelectric Element 5 Inversion Mechanism Section 51 Frame 52 First Inversion Plate 53 Second Inversion Plate 54 Inversion Position Adjustment Screw 55 Inversion Spring 56 Rotating Lever 57 Actuation Plate 6 Contact Device 7 Operating Member 8 Reset Button

Claims (1)

[Scope of utility model registration request] 1. A thermal element that displaces in accordance with the amount of energization, and a first reversal plate and a second reversal plate that are swingably held with respect to a frame fixed at a fixed position of the body are reversed. When the second reversing plate is positioned at one of the stable positions by interlocking via a spring, the first reversing plate receives a pressing force from the operating plate that operates in accordance with the displacement of the thermal element, and the reversing spring When the center line of the second reversing plate crosses a straight line connecting the connecting part of the second reversing plate with the reversing spring and the fulcrum of the second reversing plate with respect to the frame, the second reversing plate moves rapidly to the other stable position. A reversing mechanism portion, a contact device composed of a movable contact and a fixed contact that opens and closes with the swing of the second reversing plate, and a movable according to the swinging of the second reversing plate. An operating member that applies a pressing force to a contact, and a contact device by displacement of the thermal element In an overcurrent relay having a reset button for returning the open / closed state of the contact device to the initial open / closed state when the open / closed state is reversed, an inversion position adjusting screw having a groove is provided on the second inversion plate of the inversion mechanism section. The overcurrent relay, wherein the reversing spring is inserted and locked in the groove of the reversing position adjusting screw.