JP2571529Y2 - thermal relay - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal relay in which a contact device is driven in conjunction with a thermodynamic element which is displaced in accordance with the amount of electricity.

[0002]

2. Description of the Related Art Generally, a thermal relay of this type is provided with a thermodynamic element which is displaced in accordance with the amount of current supplied, and transmits the displacement of the thermodynamic element to a reversing mechanism via an operating plate or the like, and transmits the displacement to the reversing mechanism. A contact drive plate provided and swinging between two prescribed stable positions is connected to the contact device via a card so that the open / close state of the contact device is reversed with the swing of the contact drive device. It is configured. The reversing mechanism is configured by connecting, via a reversing spring, a pressing plate and a contact driving plate, each of which is swingably held to a frame fixed to the body, via a reversing spring. It is configured to swing instantly between two stable positions. The pressing plate is
When the displacement of the thermal element reaches a predetermined amount when the contact driving plate is located at one of the stable positions, it is pressed by the operating plate to move the contact driving plate to the other stable position. Further, the card is slidably disposed with respect to the body, and inverts the open / close state of the contact device as the contact drive plate swings.

[0005] As shown in FIG. 15, the housing 1 is provided with a reset button 5 which is protruded from the housing 1 so as to be able to move forward and backward and is urged by a return spring 54 in a direction to protrude from the housing 1. When the reset button 5 is pushed into the body 1 when the contact driving plate is located at the other stable position, a force for sliding the card acts on the card from the reset button 5 and the contact driving plate is moved to the one stable position. Return to position. Here, as shown in FIG. 16, the head 5 of the reset button 5 is operated so that the reset button 5 can be operated with a finger or the like.
a is disposed so as to protrude from the container 1.

[0004]

According to the above configuration, since the reset button 5 protrudes from the body 1,
When performing other operations, the reset button 5 may be accidentally reset by touching the reset button 5 with a finger or the like, or the reset button 5 may be held in a depressed state by another member such as an electric wire. May interfere with normal operation.

In order to solve such a problem, it is conceivable to arrange the head 5a of the reset button 5 so as not to protrude from the body 1. In this case, a tool such as a driver is used. Since the reset button 5 is operated, there is a problem that the reset button 5 cannot be easily operated with a finger or the like. The present invention is intended to solve the above-described problem.When operating the reset button, other members or fingers can easily operate the reset button without using a tool without using a tool. To provide a thermal relay that is prevented from being inadvertently reset.

[0006]

According to the present invention, in order to achieve the above object, a thermodynamic element which is displaced in accordance with the amount of electricity is provided;
A reversing mechanism for connecting the pressing plate and the contact driving plate, each of which is swingably held with respect to the frame, via a reversing spring, and for oscillating the contact driving plate between two prescribed stable positions;
When the displacement of the thermal element reaches a predetermined amount when the contact driving plate is located at one of the stable positions, an operating plate that presses the pressing plate to move the contact driving plate to the other stable position, A card that is slidably disposed to reverse the open / close state of the contact device in accordance with the swinging of the contact drive plate, and a card that is protruded forward and backward from the container and urged in a direction to protrude from the container.
Cylindrical head projecting from one end of the head
When the contact driving plate is located at the other stable position, the contact driving plate is pushed into the body when the contact driving plate is positioned at the other stable position to exert a force in a direction to slide the card from the inclined surface. A thermal relay having a reset button for moving the contact driving plate to the one stable position.
A guide projection is provided on the peripheral surface of the head of the reset button,
Push the reset button into the case and rotate it at the same time
Guide when the position of the card is regulated by the inclined surface
Lock the protrusion and push the reset button into the body
A guide rib to be held is provided on the body, and the reset button is provided.
Guide grooves along the direction of movement on the peripheral surface of the head
Formed on a different part from the head of the reset button
It forms a projecting wall that surrounds substantially half of the circumferential surface of the protruding portion from the device body
Of the reset button
A releasable guide piece is provided to regulate the movement direction to the forward and backward directions.
It is Ketamo of.

[0007]

According to the above arrangement, the reset button is provided on the peripheral surface of the head.
Provide a guide projection and push the reset button into the body
At the same time, the position of the card is regulated by the inclined surface.
Lock the guide projection when you control
Guide ribs are provided on the body to hold the
The reset button on the peripheral surface of the head
The guide groove is formed in a portion different from the guide protrusion, and
A reset wall is formed around a half of the circumference of the projecting part of the head of the reset button from the body and inserted into the guide groove.
Cutting that controls the direction of movement of the reset button in the forward and backward directions
Since there is a possible guide piece , the reset button can be pushed by a finger or the like without using a tool in the area around the reset button where the protruding wall is not locked, which has the advantage of good operability. It has. Further, since the protruding wall is formed, the chance of other members or fingers touching the reset button carelessly is reduced, and the frequency of erroneous operation of erroneous resetting is greatly reduced. Furthermore, when the reset button is pressed, the reset button
Is in the direction of the inside of the body without rotating along the guide piece
As it moves, the tip of the leg of the reset button with an inclined surface
Accurately abuts the card to accurately reset the card manually
Can be done. On the other hand, remove the guide piece and reset it.
Button at the same time as pushing it into the
When the tip of the contacting leg is displaced, the guide
Locked by id rib and pushed reset button into the body
The contact drive plate from one stable position
The card slides due to the displacement of the thermal element and the other is stable
The card touches the reset button leg before
When the displacement of the thermal element is eliminated, the contact drive plate
Automatically returns to the stable position.
This has the advantage that the loading can be performed easily.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS.
Is formed by a body 11 having an open surface, a cover 12 for closing the opening of the body 11, and a middle lid 6 interposed between the body 11 and the cover 12 so as to partially close the body 11. Then, the assembly screw 14 is screwed into the boss 13 formed on the body 11 through the cover 12, so that the body 11 and the cover 12 are connected. As shown in FIG.
a is projected, and a perforated engaging piece 12a provided on the cover 12 is provided.
, The coupling strength between the body 11 and the cover 12 is increased.

The interior of the body 11 is divided into three large sections 16a, 16b and 16c by a partition wall 15. The second section 16b is formed on one side of the container 1 over substantially the entire length in the vertical direction in FIG.
6a and the third section 16c are arranged above and below in FIG. The first section 16a is further divided into three chambers by a partition wall 15 formed substantially in parallel, and the thermodynamic elements 2 are housed in the other two chambers except for the central one chamber. The thermal element 2 is formed by spirally winding a strip-shaped heater 23 via an insulating material 22 around a bimetal 21 formed in a rectangular plate shape, and one end of the heater 23 is welded to one end of the bimetal 21. It is fixed by such a method. The bimetal 21 is disposed so as to be parallel to the partition wall 15 that divides the first section 16a into three chambers. When the bimetal 21 is heated, it is deformed in the thickness direction of the partition wall 15. The other end of the bimetal 21 and the other end of the heater 23 are fixed to terminal plates 24 and 25, respectively.

[0010] The terminal plate 24 is formed of sheet metal, and is fixed along the inner surface of the bottom wall of the body 11.
A connecting piece 24b which is provided so as to protrude from the inner surface of the bottom wall of the body 11 and is continuous with the fixing piece 24a; and a connecting piece 24b which is provided so as to penetrate the bottom wall of the body 11 and is integrated with the fixing piece 24b. And a terminal piece 24c which is continuous with the terminal piece. Fixed piece 2
4a is formed with a screw hole 24d, as shown in FIG.
The terminal plate 24 is fixed to the body 11 by a fixing screw 26 screwed into the screw hole 24d through the bottom wall of the body 11. The other end of the bimetal 21 is fixed to the connection piece 24b by a method such as welding. In the terminal strip 24c,
A screw hole 24e is formed so that the terminal screw 27 having the washer 27a is screwed.

On the other hand, the terminal plate 25 has a shape in which a connecting piece 25a substantially parallel to the bimetal 21 and a terminal piece 25b protruding from the body 1 through the cover 12 are integrally connected. The other end of the heater 23 is fixed to the connection piece 25a by a method such as welding. Also, the connection piece 25
Step a 25c is formed in the third section 16a so that a part of the connection piece 25a projects outside the opening surface of the body 11 to form a third section 16a.
c.

A terminal plate 28 in which connecting pieces 24b and 25a of the terminal plate 24 and the terminal plate 25 are integrally connected to each other is provided in a center room of the first section 16a. That is, the terminal plate 28 includes a terminal piece 28a protruding from the body 1 through the bottom wall of the body 11, and a terminal piece 28b protruding from the body 1 through the cover 12, and both terminal pieces 28a, 28b
Are connected together. In the terminal strip 28a,
A screw hole 28c is formed so that the terminal screw 27 having the washer 27a is screwed.

On the outer surface of the body 11, each terminal piece 2
4c and 28a protrude from each terminal piece 24c,
A partition 11b is provided to isolate 8a (see FIG. 7). In the cover 12, the terminal pieces 25b,
The holding wall 12b is protruded from a portion where the 28b protrudes,
The rattling of the terminal strips 25b and 28b is prevented. According to the above configuration, when current is supplied between the terminal piece 24c and the terminal piece 25b, current flows through the bimetal 21 and the heater 23, and the self-heating of the bimetal 21 and the heating of the heater 23 cause the bimetal 21 to generate heat. The one end is displaced in the thickness direction of the bimetal 21 with respect to the other end. The direction of displacement is a direction in which the one end approaches the second section 16b, and the amount of displacement depends on the amount of heat generated by the bimetal 21 and the heater 23.

A partition wall 1 for dividing the first section 16a into three chambers
5, a slit 15a is formed in the partition wall 15 for partitioning the first section 16a and the second section 16b at a position corresponding to the one end of the bimetal 21, and moves in a direction orthogonal to the opening surface of the slit 15a. The interlocking plate 17 is arranged so as to be free. The interlocking plate 17 has three leg pieces 1
7a are integrally connected via a connecting piece 17b, and are formed into a substantially E shape. When at least one bimetal 21 is deformed, the leg piece 17a is pressed and the second end of the interlocking plate 17 is pressed.
The protrusion amount to the section 16b is made large. A pushing piece 17c is protruded from the leg piece 17a projecting to the second section 16b. Further, the interlocking plate 17 has play in the moving direction with respect to the bimetal 21, so that when one bimetal 21 is deformed, it can move without deforming the other bimetal 21.

The snap device 3 is stored in the second section 16b. As shown in FIG. 8, the trip device 3 includes a reversing mechanism 31 and an operating point adjusting mechanism 32. The reversing mechanism 31 includes a frame 33 fixed to the body 11.
In this configuration, the pressing plate 34 and the contact driving plate 35 are swingably attached to each other, and the pressing plate 34 and the contact driving plate 35 are connected via a reversing spring 36 formed of a coil spring. The frame 33 includes a press-fitting piece 33a press-fitted into a mounting hole 18 (see FIG. 9) formed in the body 11, and a substantially V-shaped piece.
Arms 33b, 33c having notched grooves 33d, 33e
And The pressing plate 34 and the contact driving plate 35 are supported such that the other ends thereof can swing in the thickness direction of the frame 33 by inserting one ends into the notch grooves 33d and 33e, respectively. Also, the notch grooves 33d, 33
e are open away from each other, and are held by the frame 33 by applying a tensile force between the pressing plate 34 and the contact driving plate 35 via a reversing spring 36.

In the reversing mechanism 31, a contact drive plate 35
Of the frame 3 in the thickness direction of the frame 33.
3, the center line of the reversing spring 36 extends beyond a straight line connecting the joint of the contact driving plate 35 with the reversing spring 36 and the fulcrum of the contact driving plate 35 to the frame 33. , The spring force of the reversing spring 36 acts in a direction in which the tip of the contact drive plate 35 is pulled away from the frame 33. Therefore, the distal end of the contact drive plate 35 is held at a position away from the frame 33 in the thickness direction of the frame 33 (hereinafter, this position is referred to as a reset position). Also,
When the distal end of the contact driving plate 35 is separated from the frame 33 in the thickness direction of the frame 33, the pressing plate 34
When the middle part of the contact driving plate 35 is pressed in the direction of approaching the frame 33, the center line of the reversing spring 36
When the contact drive plate 35 is positioned closer to the frame 33 beyond the straight line connecting the fulcrum to the fulcrum 3, the spring force of the reversing spring 36 acts so that the tip of the contact drive plate 35 approaches the frame 33, and the contact drive plate 35 is moved. It is rapidly moved in a direction approaching the frame 33. That is, a so-called trip operation is performed, and the tip of the contact drive plate 35 is held at a position close to the frame 33 in the thickness direction of the frame 33 (hereinafter, this position is referred to as a trip position).

The operating point adjusting mechanism 32 includes a rotating lever 37 rotatably mounted on a shaft projection 19 projecting from the body 11 in a direction perpendicular to the bottom wall, and a rotating lever 37. The operation plate 38 held swingably with respect to the body 11
And an operating point adjusting cam 39 rotatably attached to the peripheral wall. The rotating lever 37 has a substantially U-shaped lever body 37c in which a pair of parallel leg pieces 37a are connected via a pair of connecting pieces 37b, and the shaft projection 19 is inserted into one leg piece 37a. A bearing hole 37d is formed, and a bearing recess 37e abutting on the peripheral surface of the shaft projection 19 is formed in the other leg piece 37a. One connecting piece 37b of the lever main body 37c is substantially T-shaped, and a holding piece 37f is formed substantially orthogonal to the T-shaped leg, and the operating piece 38 is swingably held on the holding piece 37f. A holding hole 37g is formed. The holding hole 37g has a substantially rectangular shape, and has a shape in which a holding recess 37h is formed on one side of the connecting piece 37b. Further, a holding projection 37i is protruded from the inner peripheral edge of the holding hole 37g so as to face the holding recess 37h. The leg piece 37a provided with the bearing hole 37d is provided with a holding piece 37f with respect to the bearing hole 37d.
The adjustment piece 37j is formed at the tip of the leg piece 37a in substantially the same plane as the connecting piece 37b.

The operating plate 38 has notches 3 at both side edges of the intermediate portion.
8a. The operation plate 38 is provided with a rotating lever 37.
Of the holding recess 37h of the holding hole 37g is fitted into both the notches 38a. That is, by fitting a part of the operation plate 38 into the holding recess 37h, the movement of the operation plate 38 in the longitudinal direction and the width direction is restricted. Also, in order to restrict the movement of the operation plate 38 in the thickness direction, the distance between the bottom surface of the holding recess 37h and the tip end surface of the holding protrusion 37i is slightly larger than the thickness of the operation plate 38 so that the holding hole 37g is formed. One side of the peripheral portion provided with the holding projection 37i is plastically deformed by a method such as tapping. Here, the swing range of the operation plate 38 with respect to the rotation lever 37 is restricted by the distance between the bottom surface of the holding recess 37h and the holding protrusion 37i. That is, the operating plate 38 swings only in a range corresponding to the gap between the bottom surface of the holding recess 37h and the tip end surface of the holding protrusion 37i. One end of the operation plate 38 is arranged at a position where it can abut on the pressing piece 17 c of the interlocking plate 17, and the other end is arranged at a position where it can abut on the pressing plate 34. That is, when the interlocking plate 17 moves due to the deformation of the thermal element 2, the operation plate 3
Numeral 8 is pressed by the interlocking plate 17 and rotates about the holding hole 37g to press the pressing plate 34 toward the frame 33.

On the other hand, as shown in FIG. 1, the operating point adjusting cam 39 has a cylindrical leg portion 39a, a flange portion 39b provided at one end of the leg portion 39a, and a projecting portion provided at the other end of the leg portion 39a. And a cam projection 39c. The leg 39a is the body 1
The flange portion 39 b is inserted into a through hole 11 c formed in the peripheral wall of the body 11 and abuts on the outer surface of the body 11. A cross-shaped driver groove 39f is formed at the center of the portion of the operating point adjusting cam 39 that is exposed on the outer surface of the body 11 so that the tip of a Phillips screwdriver or the like can be inserted. The adjustment cam 39 can be rotated. A protective wall 11d surrounding the periphery of the flange portion 39b is formed on the outer surface of the peripheral wall of the body 11, to prevent the operating point adjustment cam 39 from rotating carelessly when another member comes into contact with the outer periphery of the flange portion 39b. Preventing. A groove 39d is formed on the entire peripheral surface of the leg 39a, and a holding spring 39e is mounted between the groove 39d and a holding groove 11e formed on the inner peripheral surface of the peripheral wall of the body 11. The body 3 has a leg 3 at a position facing the holding spring 39e.
A holding wall 11f with which the holding spring 9a contacts is formed.
The operating point adjusting cam 39 is prevented from falling out of the body 11 by holding the leg 39a between the holding member 11e and the holding wall 11f.

The cam projection 39c is provided eccentrically with respect to the center of rotation of the leg 39a at a position where the adjusting piece 37j of the rotating lever 37 can abut. Therefore, if the operating point adjustment cam 39 is rotated, the rotation range of the rotation lever 37 around the shaft projection 19 can be adjusted.
Further, since the operating range of the operating plate 38 with respect to the rotating lever 37 is regulated, the operating point adjusting cam 39 is rotated so that the pressing plate 34 receives the pressing force from the operating plate 38 so as to be heated. The amount of deformation of the element 2 can be changed. That is, when the interlocking plate 17 moves due to the deformation of the thermal element 2, the operating plate 38 is pressed, but the operating plate 38 receives from the interlocking plate 17 until the adjusting piece 37j of the rotating lever 37 comes into contact with the cam projection 39c. The pressing force only rotates the rotating lever 37 (rotates clockwise in FIG. 5) and does not act on the pressing plate 34 of the reversing mechanism 31. On the other hand, when the adjusting piece 37j of the rotating lever 37 comes into contact with the cam projection 39c, the rotating lever 37 cannot rotate. Therefore, the pressing force acting on the operating plate 38 from the interlocking plate 17 is transmitted to the pressing plate 34. . With such a configuration, the amount of deformation of the thermal element 2 required for reversing to the trip position when the reversing mechanism 31 is at the reset position can be adjusted by the rotational position of the operating point adjusting cam 39. . That is, the operating point adjusting cam 39
By rotating, the sensitivity is adjusted.

The contact device 4 includes a second section 16b and a third section 16b.
It is arranged straddling the section 16c. The contact device 4 includes a pair of movable spring plates 41a, 42a, and each movable spring plate 41a,
A pair of fixing plates 43a, 44a respectively corresponding to 42a
And Each of the movable spring plates 41a, 42a and each of the fixed plates 43a, 44a are respectively provided with terminal plates 41b, 42b, 43 arranged so as to penetrate the bottom wall of the body 11.
b, 44b. Each terminal board 41b, 42b, 4
Screw holes 41c, 42c, 43c, 44 into which terminal screws 45 each having a washer 45a are screwed are respectively provided in 3b, 44b.
c is formed. Each terminal board 41 on the outer surface of the body 1
As shown in FIG. 7, the spaces b, 42b, 43b, and 44b are separated by a partition 11b. Each movable spring plate 41
The a and a and the fixed plates 43a and 44a are provided with elongated contacts, respectively, which are substantially orthogonal to each other. Each movable spring plate 41a, 42a has a spring force so as to contact the corresponding fixed plate 43a, 44a when no external force is applied.

The reversing mechanism 31 is attached to the movable spring plates 41a and 41b via a card 46 made of insulating synthetic resin.
Is connected to the contact drive plate 35 of the first embodiment. The card 46 is slidably disposed so that both ends are inserted through slits 15 b and 15 c formed in the partition wall 15.
5b, it is arranged so as to straddle the second section 16b and the third section 16c. As shown in FIG.
At one end inserted into the second section 16b,
A notch groove 46a with which the contact drive plate 35 engages and a notch groove 46b with which one of the movable spring plates 41a engages are formed.
Further, a wide cutout groove 46c through which each movable spring plate 41b is inserted is formed in a portion of the card 46 arranged in the third section 16c. Therefore, the reversing mechanism 3
The card 46 slides with the swing of the first contact driving plate 35, and the movable spring plates 41 a and 42 a swing by the card 46. Each of the slits 15b is provided on both sides of the wide cutout groove 46c in the sliding direction of the card 46.
A stopper projection 46d that can be brought into contact with the peripheral portion of 15c,
46e, and one of the stopper projections 46d, 46e corresponds to the slit 15 when the card 46 moves.
b, 15c, the card 46
Is restricted. That is,
Both stopper projections 46d and 46e are both slits 15b and 1
5c, and the distance corresponding to the difference between the distance between the slits 15b and 15c and the distance between the stopper projections 46d and 46e is the movable distance of the card 46.
When the reversing mechanism 31 is at the reset position and the card 46 has moved toward the second section 16b in the sliding direction, the movable spring plate 41a contacts the fixed plate 43a, and the movable spring plate 42a is located on the periphery of the notch groove 46c. And is separated from the fixing plate 44a. When the reversing mechanism 31 is in the trip position and the card 46 has moved to the third section 16c in the sliding direction, the movable spring plate 42a contacts the fixed plate 44a, and the movable spring plate 41a
Is separated from the fixed plate 43a by being pressed by the peripheral edge of the fixed plate 43a. In short, both movable spring plates 41a and 42a are
The open / close states of 3a and 44a are opposite to each other.

The card 46 is provided with a test piece 46f protruding out of the body 1 through the cover 12, and by operating the test piece 46f using a driver or the like, the operation regarding the open / close state of the contact device 4 is performed. The test can be done. As shown in FIGS. 7 and 11, the outer surface of the body 11 has a concave step portion 11g surrounded by three surfaces at a portion corresponding to one end edge of the card 46 on the third section 16c side.
Is formed, and a part of the card 46 is inserted into a corner portion formed by two surfaces orthogonal to the card 46 among the three surfaces surrounding the concave step portion 11g so as to be able to advance and retreat. That is, the amount of exposure of the card 46 to the concave step 11g changes as the card 46 slides. Here, when the reversing mechanism 31 is located at the reset position, the shape of the concave step 11g is set so that the card 46 is hardly exposed to the concave step 11g. Also, the body 1 is black,
The card 46 is colored yellow or the like so that the body 1 and the card 46 can be easily identified.
Position can be easily confirmed. in short,
The operating state of the reversing mechanism 31 and the open / closed state of the contact device 4 can be confirmed by observing the amount of protrusion of the card 46 into the concave step 11g.

The body 11 is provided with a reset button 5 for returning the inversion mechanism 31 to the reset position via the card 46 by pushing the inversion mechanism 31 into the body 11 when the inversion mechanism 31 is in the trip position. Can be The reset button 5 is formed in a shape in which a leg 5b protrudes from one end surface of a columnar head 5a, and a disc-shaped flange 5c is provided at an intermediate portion of the leg 5b. In the body 11, a part of an outer wall parallel to the card 46 and a surface facing the cover 12 are opened, and a recess 5 having a partition wall 52 parallel to the card 46 is formed.
1 is formed. The peripheral edge of the slit groove 53 formed in the partition wall 52 of the recess 51 is sandwiched between one end edge of a return spring 54 composed of a coil spring inserted into the leg 5b of the reset button 5 and the flange 5c. By doing so, the reset button 5 is urged by the return spring 54 so that the head 5a projects to the outer surface of the body 11. Therefore, the reset button 5 is configured such that the return spring 54 is
A position (the position most pushed into the body 11) between the first partition wall 52 and the flange portion 5c.
Can be moved back and forth between a position where it comes into contact with the partition wall 52 of the recess 51 (a position that protrudes most from the body 11).

On the peripheral wall of the recess 51, which is parallel to the card 46 and serves as the outer wall of the body 11, a notch 55 having an opening on the cover 12 side is formed, and the peripheral edge of the notch 55 faces the cover 12. At the center of the periphery, a cutout recess 56 is formed, which is recessed in a semicircular shape. 12, a stopper rib 57 and a guide rib 58 are formed inside the recess 51. As shown in FIG. The stopper rib 57 runs in a direction substantially perpendicular to the card 46, and
The portion 8 is formed so that a portion formed parallel to a part of the stopper rib 57 and a portion formed apart from the outer wall of the body 11 so as to be parallel to the card 46 are continuous. An edge of a portion of the guide rib 58 parallel to the card 46 is formed in a shape along the opening edge of the cutout recess 56.

By the way, an inner lid 6 sandwiched between the partition wall 15 of the body 11 and the cover 12 is provided at a portion corresponding to the third section 16c. Positioning holes 61 are formed at two places in the inner lid 6, and positioning projections 15 d protruding from the end surface of the partition wall 15 are inserted into the positioning holes 61, thereby positioning the inner lid 6 with respect to the body 11. Done. As shown in FIG. 13, a holding wall 62 that holds a part of each of the terminal plates 25 and 28 is formed on a surface of the inner lid 6 facing the cover 12. Further, as shown in FIG. 14, a first projection 63 inserted into the recess 51 and a second projection 64 inserted into the third section 16c are integrally formed on the inner lid 6, as shown in FIG. . The first protrusion 63 and the second protrusion 64 are separated from each other with the partition wall 52 of the recess 51 interposed therebetween. The first protruding base 63 is formed in a shape that fills a portion of the notch 51 except the notch recess 56, and a surface facing the notch recess 56 is formed in a circular shape together with the notch recess 56 to form the reset button 5. Is formed in a semicircular cross section so as to hold the head 5a. The first protruding base 63 is integrally formed with a protruding wall 65 protruding from the outer surface of the body 11 along the outer peripheral surface of the head 5 a of the reset button 5. The projecting amount of the projecting wall 65 from the body 11 is set to be substantially equal to the maximum projecting amount of the reset button 5 from the body 11, and surrounds a half circumference of the head 5a of the reset button 5. Therefore, the presence of the protruding wall 65 prevents other members from accidentally abutting the reset button 5. A window hole 66 is formed at an intermediate portion in the circumferential direction of the protruding wall 65. In the window hole 66, a part is integrally connected to the first protruding base 63, and a part is formed inside the protruding wall 65. A guide piece 67 protruding inward from the peripheral surface is provided. Guide piece 6
7 is connected to the first protrusion 63 so that it can be relatively easily broken off. The distal end surface of the second protruding base 64 is slid so that the flange 5c of the reset button 5 abuts on the end surface.
It is formed in a semicircular cross section. Therefore, the reset button 5 includes the slit groove 53, the notch recess 56, the first protrusion 63,
It is held by the second protrusion 64 or the like so as to be able to advance and retreat without shaft runout.

On the peripheral surface of the head 5a of the reset button 5, FIG.
As shown in FIG. 5, a guide projection 5e is provided so as to project, and the guide projection 5e is arranged so as to be movable only along the guide rib 58. That is, the guide protrusion 5 e is provided between the stopper rib 57 and the guide rib 58 and the guide rib 5.
It is possible to move only between 8 and the bottom wall of the recess 51.
When the guide projection 5e is located between the stopper rib 57 and the guide rib 58, the reset button 5 cannot rotate and moves forward and backward, so that the guide projection 5e moves between the guide rib 58 and the bottom wall of the recess 51. When the reset button 5 is located, the reset button 5 can rotate, but is restricted by being pushed into the body 11 by the guide rib 58, so that the reset button 5 can hardly move forward and backward. The range of rotation is the same as that of the stopper rib 57.
Position (hereinafter referred to as manual reset position)
The position is restricted to a range of about 90 degrees between the position and the position in contact with the distal end surface of the first protrusion 63 (hereinafter, referred to as an automatic reset position).

An inclined surface 5d is formed at the tip of the leg 5b of the reset button 5. The inclined surface 5d is inclined in the sliding direction of the card 46 at the manual reset position, and is inclined such that the trip position side of the reversing mechanism 31 projects beyond the reset position side. Now, when the reversing mechanism 31 is in the trip position, the inclined surface 5d comes into contact with the periphery of the cutout groove 46c of the card 46 by pushing the reset button 5, and the card 46 is pressed by the pressing force received from the inclined surface 5d. It moves so that the reversing mechanism 31 is reversed to the reset position. On the other hand, the slope 5
d is inclined in a direction substantially perpendicular to the sliding direction of the card 46 in the automatic reset position. In this state, when the reversing mechanism 31 attempts to move to the trip position, the card 4
When the leg 5b of the reset button 5 abuts on the periphery of the notch groove 46c of No. 6, the position of the card 46 is regulated so that the trip position is not held. That is, when the movable spring plate 42a is brought into contact with the fixed plate 44a only while the pressing force from the operating plate 38 is acting on the pressing plate 34 of the reversing mechanism 31, and the pressing force on the pressing plate 34 is removed, The movable spring plate 41a returns to the state in which it comes into contact with the fixed plate 43a. In short, the operation is stabilized only at the reset position, and the operation becomes monostable.

In the head 5a of the reset button 5, a guide groove 5 into which a guide piece 67 is inserted at a manual reset position.
f is formed. The guide groove 5f is formed along the direction in which the reset button 5 advances and retreats.
In the state where the reset button 5 is inserted into the position f, the movement of the reset button 5 is restricted so that only the advance and retreat can be performed. That is, the guide piece 6
When 7 is present, the automatic reset position cannot be set. In a normal use state, it is sufficient to reset manually, so that the function is not affected. Since the guide piece 67 can be relatively easily broken off, if it is necessary to move the reset button 5 to the automatic reset position, the guide piece 67 may be broken off. A driver groove 5g is formed on the tip end surface of the head 5a of the reset button 5 so that a Phillips screwdriver can be inserted, and the reset button 5 can be pushed and rotated using a driver or the like. .

[0030]

[Effects of the Invention] As described above, the present invention is applied to the head of the reset button.
Provide a guide protrusion on the peripheral surface of the part, and press the reset button
Insert the card and rotate it at the same time.
Locks the guide projection when the position of is restricted and resets
The guide rib that holds the button pressed into the body
The reset button on the peripheral surface of the head of the reset button
Guide groove along the guide is formed at a different position from the guide protrusion
And, wherein the gas to form a projecting wall that surrounds substantially half of the circumferential surface of the protruding portion from the device body of the head of the reset button on the instrument body
The reset button is moved in the forward / backward direction
Since a releasable guide piece for regulating is provided , the reset button can be pressed by a finger or the like without using a tool in a portion around the reset button where the protruding wall is not locked, and the operability is good. It has the advantage that.
In addition, since the projecting wall is formed, the chance of other members or fingers touching the reset button carelessly is reduced, and the frequency of erroneous operation of being reset by mistake is greatly reduced. It has. In addition,
When the set button is pressed, the reset button rotates along the guide piece.
Because it moves in the direction of the inside of the body without turning,
The tip of the leg of the reset button provided with the abutment on the card accurately
To perform a manual reset of the card.
On the other hand, cut off the guide piece and push the reset button into the body
At the same time as rotating the tip of the leg that comes into contact with the card
When the position is displaced, the guide projection is locked by the guide rib
Since the reset button is held pressed down into the body,
When the contact drive plate is displaced from one of the stable
Before the card slides into the other stable position,
Mode is in contact with the leg of the reset button and the displacement of the thermal element is released.
The contact drive plate returns to one stable position when turned off
This makes it easy to automatically reset the card
It has the advantage that it can be done.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment.

FIG. 2 is an external perspective view of the embodiment.

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

FIG. 4 is a sectional view of a main part of the embodiment.

FIG. 5 is a rear view of the embodiment with a cover and an inner lid removed.

FIG. 6 is a longitudinal sectional view of the embodiment.

FIG. 7 is a front view of the embodiment.

FIG. 8 is an exploded perspective view of a main part showing the embodiment.

FIG. 9 is a longitudinal sectional view of the embodiment.

FIG. 10 is a cross-sectional view of the embodiment.

FIG. 11 is a plan view of the embodiment.

FIG. 12 is a rear view of a main part of the embodiment with a cover and an inner lid removed.

FIG. 13 is a rear view of the embodiment with the cover removed.

FIG. 14 is a perspective view of an inner lid used in the embodiment.

FIG. 15 is a sectional view of a main part of a conventional example.

FIG. 16 is a perspective view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Thermal element 4 Contact device 5 Reset button 31 Reversing mechanism part 33 Frame 34 Pressing plate 35 Contact driving plate 36 Reversing spring 38 Operating plate 46 Card 65 Projecting wall

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 57-70624 (JP, U) JP-A 58-11829 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01H 13/00-13/76 H01H 61/00-61/08

Claims (1)

(57) [Scope of request for utility model registration] A contact drive plate is connected to a thermodynamic element that is displaced in accordance with the amount of electric current, a pressing plate and a contact drive plate, each of which is swingably held with respect to a frame, via a reversing spring. A reversing mechanism for swinging between two stable positions, and a contact drive plate which is pressed to press the contact plate when the displacement of the thermal element reaches a predetermined amount when the contact drive plate is located at one of the stable positions. An operating plate that moves to a stable position, a card that is slidably arranged with respect to the body, and that reverses the open / close state of the contact device as the contact drive plate swings, and a card that protrudes and retracts from the body Is it a body that is urged to protrude
Protruding from the cylindrical head and one end of the head
When the contact drive plate is located at the other stable position, the contact drive plate is pushed into the body when the contact drive plate is positioned at the other stable position, thereby applying a force in a direction to slide the card from the inclined surface. And a reset button for moving the driving plate to the one stable position .
A guide projection is provided on the peripheral surface of the head of the reset button,
Push button into the case and rotate it at the same time
Guide protrusion when the position of the card is regulated by the surface
And hold the reset button pushed into the body
A guide rib to be provided on the body, and a head of the reset button
A guide groove along the direction of movement on the peripheral surface of the part
The reset button is formed in a different part, and a projecting wall is formed on the body so as to surround substantially a half of the circumference of the protruding portion of the head of the reset button from the body .
And the reset button is moved into the guide groove
A releasable guide piece is provided to regulate the direction of movement.
A thermal relay , characterized in that: