JPH0577845U - Thermal relay operating point adjustment device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an operating point adjusting device of a thermal relay that can know the effective range of a cam body for adjusting so as to obtain a reversing operation of a reversing mechanism corresponding to a rated current amount. The adjusting dial 39 is provided on its surface with graduations 80, 80 indicating that the rotating lever 37 can come into contact within the effective range of the cam surface of the cam body 39c. When the operating point is adjusted, the adjustment dial 39 is rotated by using the scales 80, 80 as a guide so that the adjustment is not performed beyond the effective range of the cam surface of the cam body 39c.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an operating point adjusting device for a thermal relay, which drives a contact device in response to a displacement of a thermal element according to an amount of energization.

[0002]

[Prior Art]

 Conventionally, in this type of thermal relay, a trip device is provided in order to transmit the displacement of a thermal element having a bimetal or the like to a contact device. The trip device includes a reversing mechanism unit that reverses the open / closed state of the contact device when the reversing plate is pressed by a predetermined amount, and is interposed between the thermal element and the reversing plate to detect the displacement amount of the thermal element and the reversing plate. And an operating point adjusting device for adjusting the amount of displacement of the thermal element required to reverse the contact device by adjusting the correspondence with the pressing amount of.

In the operating point adjusting device, a middle portion is pivotally supported with respect to the body, and a pivot lever is pivotable in the same direction as the pivot lever, and the pivot range is restricted. In the shape of an actuating plate whose middle part is pivotally supported at one end of the turning lever, and an operating point for restricting the turning range of the turning lever by abutting the cam surface on the other end of the turning lever. It consists of a cam body and an adjusting dial that is fixed to the cam body and is rotatable from the surface of the body. The displacement of the thermal element is transmitted to one end of the operating plate via the interlocking plate, and the reversing plate of the reversing mechanism is pressed by the other end of the operating plate. Therefore, the pushing amount of the reversing plate by the actuation plate corresponds to the sum of the turning amount of the actuation plate with respect to the turning lever and the turning amount of the turning lever with respect to the body. If the rotation range of the rotation lever is adjusted by the cam body, the displacement amount of the thermal element required to reverse the open / closed state of the contact device is adjusted.

In addition, the cam surface at the center of the effective range of the cam surface of the cam body comes into contact with the other end of the rotary lever when aligned with the mark indicating the reference position on the body side on the adjustment dial surface. There was a mark of Δ indicating that it was in the position.

[0005]

[Problems to be solved by the device]

 By the way, since the characteristics of the finished product vary, the reference gauge of thickness corresponding to the displacement of the thermal element when the rated current to be inverted by the reversing mechanism is normally applied to the thermal element is linked. Insert it between the plate and one end of the operating plate and rotate the rotating lever a certain amount.In this state, adjust the adjustment dial until the cam surface of the cam body contacts the rotating lever and the reversing mechanism part is reversed. Rotate and fix the adjustment dial at its inverted position.Adjustment work is performed as described above, but the adjustment dial has the cam surface at the center of the effective range of the cam on the other end of the rotation lever. Since there is only a mark of Δ indicating that it is in the contact position, there is a problem that the adjustment dial is rotated to a position outside the effective range of the cam body.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cam body for adjusting so as to obtain the reversing operation of the reversing mechanism portion corresponding to the rated current amount. The purpose is to provide an operating point adjustment device for a thermal relay that allows the effective range to be known and adjustments to be performed easily.

[0007]

[Means for Solving the Problems]

 In the present invention, in order to achieve the above-mentioned object, a thermal element that is displaced according to the amount of electricity supplied, an inversion mechanism section that inverts the open / closed state of a contact device when a predetermined amount is pressed, and an intermediate section are included in the body. On the other hand, a rotation lever that is swingably supported and rotates within a specified range, and a middle lever that is swingable in the same direction as the rotation lever and has a restricted swing range. The pivot lever is pivotally supported at one end of the shaft and the rotating lever is rotated to the maximum position within the specified range by the pressing force received at the one end. When the rotation is restricted, the other end presses the reversing mechanism. An operating point adjusting device provided in a thermal relay equipped with a moving plate and an interlocking plate for transmitting the displacement of the thermal element to one end of the operating plate, further turning when the turning lever comes into contact. A cam surface that restricts the rotation of the lever is formed around the rotation axis so that the rotation lever A cam body that can adjust the rotation restriction position of the rotation lever by changing the position of the contacting cam surface, and an adjustment dial that is fixed to this cam body and that can be rotated from the outside of the body. , A scale that is formed on the surface of the adjusting dial and that indicates that the turning lever can contact within the effective range of the cam surface of the cam body if the reference mark on the body side is within the scale range. It is a thing.

[0008]

[Action]

 According to the above configuration, when the rated current is adjusted by rotating the adjustment dial, it is clearly known whether the cam surface of the cam body contacting the rotating lever is within the effective range. There is no need to rotate the adjustment dial to the position where it was adjusted, and adjustment can be performed reliably.

[0009]

【Example】

 As shown in FIG. 3, FIG. 4, FIG. 5, etc., the body 1 includes a body 11 having an opening on one side, a cover 12 that closes the opening of the body 11, and a body 11 that covers a part of the body 11. The cover 11 is formed between the cover 11 and the cover 12, and the assembly screw 14 is screwed through the cover 12 to the boss 13 formed on the body 11, so that the body 11 and the cover 12 are separated from each other. Be combined. As shown in FIG. 7, an engaging projection 11a is provided on one side surface of the body 11, and by engaging with a perforated engaging piece 12a provided on the cover 12, the coupling strength between the body 11 and the cover 12 is increased. Has been increased.

The inside of the body 11 is largely divided into three sections 16 a, 16 b, 16 c by the partition wall 15. The second section 16b is formed on one side of the body 1 over substantially the entire length in the upper four directions in FIG. 2, and the first section 16a and the third section 16c are arranged above and below in FIG. It The first compartment 16a is further divided into three chambers by a partition wall 15 formed substantially in parallel, and the thermal element 2 is housed in each of the other two chambers except the central chamber. The thermal element 2 is formed by spirally winding a belt-shaped heater 23 around an insulating material 22 around a bimetal 21 formed in a rectangular plate. One end of the heater 23 is one end of the bimetal 21. It is fixed by a method such as welding. The bimetal 21 is arranged so as to be parallel to the partition wall 15 that partitions the first compartment 16a into three chambers, and 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 the terminal plates 24 and 25, respectively.

The terminal plate 24 is formed of a metal plate, and is arranged along the inner surface of the bottom wall of the body 11 and the fixing piece 24 a that projects from the inner surface of the bottom wall of the body 11. The connection piece 24b is integrally connected to 24a, and the terminal piece 24c is provided so as to penetrate the bottom wall of the body 11 and is continuous to the fixed piece 24b. A screw hole 24d is formed in the fixing piece 24a, and as shown in FIG. 7, the terminal plate 24 is fixed to the body 11 by a fixing screw 26 that is 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 connecting piece 24b by welding or the like. A screw hole 24e is formed in the terminal piece 24c so that the terminal screw 27 having a washer 27a can be screwed.

On the other hand, the terminal plate 25 has a shape in which a connection piece 25 a substantially parallel to the bimetal 21 and a terminal piece 25 b protruding from the body 1 through the cover 12 are integrally continuous. The other end of the heater 23 is fixed to the connecting piece 25a by a method such as welding. Further, a step portion 25c is formed on the connecting piece 25a, and a part of the connecting piece 25a projects outward from the opening surface of the body 11 and straddles the third section 16c.

A terminal plate 28 in which the connecting pieces 24b, 25a of the terminal plate 24 and the terminal plate 25 are integrally connected to each other is disposed in one chamber in the center 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 the both terminal pieces 28a, 28b are integrally formed. It is connected. A screw hole 28c is formed in the terminal piece 28a so that the terminal screw 27 having a washer 27a can be screwed.

A partition wall 11b is provided on the outer surface of the body 11 at a portion where the terminal pieces 24c and 28a project, so as to isolate the terminal pieces 24c and 28a (see FIG. 8). Further, the cover 12 is provided with a retaining wall 12b at a portion where the terminal pieces 25b and 28b protrude, so that the terminal pieces 25b and 28b are prevented from rattling. According to the above configuration, when electricity is applied between the terminal piece 24c and the terminal piece 25b, a current flows through the bimetal 21 and the heater 23, and the bimetal 21 self-heats and the heater 23 heats. The one end of the bimetal 21 is displaced in the thickness direction of the bimetal 21 with respect to the other end. The direction of displacement is such that 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.

The partition wall 15 that divides the first compartment 16 a into three chambers and the partition wall 15 that separates the first compartment 16 a and the second compartment 16 b are respectively located at positions corresponding to the one end of the bimetal 21. The slit 15a is formed, and the interlocking plate 17 is arranged so as to be movable in the direction orthogonal to the opening surface of the slit 15a. The interlocking plate 17 is formed in a substantially E shape in which three leg pieces 17a are integrally connected via a connecting piece 17b, and when at least one bimetal 21 is deformed, the leg piece 17a is pressed and the interlocking plate 17 is moved. The amount of protrusion of one end into the second section 16b is increased. A pushing piece 17c is provided in a protruding manner on the leg piece 17a protruding into the second section 16b. Further, the interlocking plate 17 has a play in the moving direction with respect to the bimetal 21, and when one bimetal 21 is deformed, it can be moved without deforming the other bimetal 21.

The trip device 3 is housed in the second compartment 16b. The trip device 3 includes a reversing mechanism section 31 and an operating point adjusting mechanism section 32. As shown in FIG. 10, the reversing mechanism portion 31 swingably attaches the first reversing plate 34 and the second reversing plate 35 to the frame 33 fixed to the body 11, and the first reversing mechanism 31 is rotated. The plate 34 and the second reversing plate 35 are connected via a reversing spring 36, which is a tension spring composed of a coil spring. The frame 33 includes a press-fitting piece 33a that is press-fitted into a mounting hole 18 (see FIG. 9) formed in the body 11, and arm pieces 33b and 33c having substantially V-shaped notch grooves 33d and 33e. The first reversing plate 34 and the second reversing plate 35 are supported so that the other ends thereof are swingable in the thickness direction of the frame 33 by inserting the one ends into the notch grooves 33d and 33e, respectively. .. Further, the notch grooves 33d and 33e are opened so as to be separated from each other, and are retained on the frame 33 by applying a tensile force between the first reversing plate 34 and the second reversing plate 35 via a reversing spring 36. It is supposed to be done. The reversing spring 36 has ring-shaped hooking portions 36a at both ends, and the hooking portions 36a are inserted into the hooking holes 34a and 35a penetrating the first reversing plate 34 and the second reversing plate 35. Then, it is connected to the first reversing plate 34 and the second reversing plate 35.

In the reversing mechanism portion 31, when the tip end portion of the second reversing plate 35 is moved in the thickness direction of the frame 33 in a direction away from the frame 33, the center line of the reversing spring 36 becomes the second When it comes to be located on the opposite side of the frame 33 beyond the straight line connecting the connecting part of the reversing plate 35 with the reversing spring 36 and the fulcrum of the second reversing plate 35 with respect to the frame 33, The spring force of the reversing spring 36 acts in the direction in which the tip portion is separated from the frame 33. Therefore, the tip of the second reversing plate 35 is held at a position apart from the frame 33 in the thickness direction of the frame 33 (hereinafter, this position is referred to as a reset position). Further, when the tip portion of the second reversing plate 35 is separated from the frame 33 in the thickness direction of the frame 33, when the middle portion of the first reversing plate 34 is pressed toward the frame 33, the reversing spring When the center line of 36 is located closer to the frame 33 than the straight line connecting the connecting portion of the second reversing plate 35 with the reversing spring 36 and the fulcrum of the second reversing plate 35 to the frame 33, The spring force of the reversing spring 36 acts toward the tip of the second reversing plate 35 toward the frame 33 to rapidly move the second reversing plate 35 toward the frame 33. That is, a so-called snap operation is performed, and the tip end portion of the second reaction 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).

As shown in FIG. 10, the operating point adjusting device 32 includes a turning lever 37 rotatably attached to a shaft projection 19 provided on the body 11, and a turning lever 37 swingable with respect to the turning lever 37. An operation plate 38 held by the adjustment body 39, an adjustment dial 39 rotatably attached to the peripheral wall of the body 11 shown in FIGS. 1 and 2, and a cam body 39c integrally provided under the adjustment dial 39a. Consists of.

The turning lever 37 has a substantially U-shaped lever body 37c in which a pair of parallel leg pieces 37a are connected to each other via a pair of connecting pieces 37b. A bearing hole 37d through which the shaft 9 is inserted is formed, and an arc-shaped bearing recess 37e that abuts the peripheral surface of the shaft rib 19a 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 in a shape substantially orthogonal to the T-shaped leg portion, and the operating plate 38 is swingably held on the holding piece 37f. The holding hole 37g is formed. As shown in FIG. 11, the holding hole 37g has a substantially rectangular shape, and has a holding recess 37h formed on one side of the connecting piece 37b side. Further, a holding protrusion 37i is provided so as to face the holding recess 37h at the inner peripheral edge of the holding hole 37g. The leg piece 37a provided with the bearing hole 37d extends to the side opposite to the holding piece 37f with respect to the bearing hole 37d, and the tip end of the leg piece 37a has a adjusting piece in the same plane as the connecting piece 37b. 37j is formed.

The actuating plate 38 has cutout grooves 38a on both side edges of the intermediate portion. The operating plate 38 is inserted into the holding hole 37g of the turning lever 37, and both side peripheral portions of the holding recess 37h of the holding hole 37g are fitted into both the notch grooves 38a. That is, by inserting a part of the operating plate 38 into the holding recess 37h, the movement of the operating plate 38 in the longitudinal direction and the width direction is restricted. In order to restrict the movement of the operating plate 38 in the thickness direction, the distance between the bottom surface of the holding recess 37h and the tip surface of the holding protrusion 37i is set to be slightly larger than the thickness of the operating plate 38 as shown in FIG. 12B, the operating plate 38 is inserted into the holding hole 37g, and then, as shown in FIG. 12B, one side of the peripheral portion of the holding hole 37g provided with the holding projection 37i is plastically worked by a method such as tapping. Transform it. Here, as shown in FIG. 13, the swing range θ of the operating plate 38 with respect to the rotating lever 37 is restricted by the distance between the bottom surface of the holding recess 37h and the holding protrusion 37i. That is, as shown in FIG. 14, the operating plate 38 swings only in the range corresponding to the gap between the bottom surface of the holding recess 37h and the front end surface of the holding projection 37i. One end of the operating plate 38 is arranged at a position where it can come into contact with the pushing piece 17c of the interlocking plate 17, and the other end is arranged at a position where it can come into contact with the first reversing plate 34. That is, when the interlocking plate 17 moves due to the deformation of the thermal element 2, the actuating plate 38 is pressed by the interlocking plate 17 and rotates about the holding hole 37g, so that the first reversing plate 34 moves toward the frame 33. Press it.

On the other hand, as shown in FIG. 3, the adjustment dial 39 includes a columnar leg portion 39a, a flange portion 39b provided at one end of the leg portion 39a, and a cam body protruding from the other end of the leg portion 39a. 39c and. The leg portion 39a is inserted into a through hole 11c formed in the peripheral wall of the body 11, and the flange portion 39b abuts the outer surface of the body 11. A cross-shaped driver groove 39f is formed in the center of the portion of the adjustment dial 39 exposed on the outer surface of the body 11 so that the tip of the plus driver can be inserted. It is possible to rotate 39. Further, on the surface, graduations 80, 80 indicating the effective range of the cam surface of the cam body 39c, and graduations 81 ... As a guide for secondary adjustment are formed at predetermined intervals between the graduations 80, 80.

A protective wall 11d is formed on the outer surface of the peripheral wall of the body 11 so as to surround the peripheral edge of the flange portion 39b, and another member touches the outer peripheral edge of the flange portion 39b to prevent the adjustment dial 39 from unintentionally rotating. Is being prevented. A groove 39d is formed over the entire circumference of the leg 39a, and a retaining ring 39e is mounted between the leg 39a and the retaining groove 11e formed on the inner peripheral surface of the peripheral wall of the body 11. Further, a holding wall 11f with which the leg portion 39a abuts is formed at a portion of the body 11 facing the holding spring 39e, and the leg portion 39a is sandwiched between the holding spring 39e and the holding wall 11f to adjust the adjustment dial. The 39 is prevented from coming off from the body 11.

The cam body 39c has a cam surface eccentric to the rotation center of the leg portion 39a around the rotation axis at a position where the adjustment piece 37j of the rotation lever 37 can contact. Therefore, if the adjustment dial 39 is rotated, the rotation range of the rotation protrusion 37 of the rotation lever 37 can be adjusted. Further, since the swinging range of the operating plate 38 with respect to the rotating lever 37 is restricted, by rotating the adjusting dial 39, the first reversing plate 34 applies the pressing force from the operating plate 38. The amount of deformation of the thermal element 2 when receiving it can be changed. That is, when the moving plate 17 moves due to the deformation of the thermal element 2, the operating plate 38 is pressed, but until the adjusting piece 37 j of the rotating lever 37 comes into contact with the cam body 39c, the operating plate 38 moves from the interlocking plate 17. The pressing force received by only rotates the rotating lever 37 (rotates clockwise in FIG. 5), and does not act on the first reversing plate 34 of the reversing mechanism portion 31. On the other hand, when the adjustment piece 37j of the rotation lever 37 comes into contact with the cam surface of the cam body 39c, the rotation lever 37 cannot rotate, so that the pressing force applied from the interlocking plate 17 to the operating plate 38 is the first reversal. It is transmitted to the plate 34. With such a configuration, the deformation amount of the thermal element 2 required to reverse to the trip position when the reversing mechanism portion 31 is in the reset position can be adjusted by the rotating position of the adjusting dial 39. is there. That is, the sensitivity is adjusted by rotating the adjustment dial 39.

Here, in the present embodiment, as shown in FIGS. 1 and 2, if the reference mark X provided on the body 11 side on the surface of the adjustment dial 39 is within the range of the scale, the cam surface of the cam body 39c is Since the scales 80, 80 indicating that the rotary lever 37 can be contacted within the effective range are provided, the following adjustment work can be performed when adjusting the rated current. That is, at the time of pre-assembly, the reference mark X and the mark Y indicating that the center position of the effective range of the cam surface is at the position corresponding to the adjustment piece 37j of the rotating lever 37 are matched, and in this state, the reversing mechanism A reference gauge having a thickness corresponding to the amount of displacement of the thermal element 2 when the rated current amount to be reversed by the portion 31 is applied to the thermal element 2 is inserted between the interlocking plate 17 and one end of the operating plate 38. Then, the operating plate 38 is pressed, and the rotating lever 37 is rotated by a certain amount by this pressing, and in this state, the cam surface of the cam body 37c comes into contact with the rotating lever 37 until the reaction mechanism portion 31 is inverted. The adjustment work of rotating the adjustment dial 39 and fixing the adjustment dial 39 at the inverted position is performed in the same manner as in the conventional case, but the reference mark X on the body 11 side indicates the effective range of the cam surface 80. , 80 If the adjustment dial 39 is rotated like this, proper adjustment can be performed.

After the adjustment is completed in this way and after the secondary adjustment using the scale 81 ... Is completed, the current scale plate 82 may be attached to the surface of the adjustment dial 39. The contact device 4 is arranged across the second section 16b and the third section 16c. The contact device 4 includes a pair of movable spring plates 41a and 42a and a pair of fixed plates 43a and 44a corresponding to the movable spring plates 41a and 42a, respectively. The movable spring plates 41a, 42a and the fixed plates 43a, 44a are fixed to terminal plates 41b, 42b, 43b, 44b arranged so as to penetrate the bottom wall of the body 11, respectively. Screw holes 41c, 42c, 43c, 44c into which the terminal screws 45 each having a washer 45a are screwed are formed in each of the terminal plates 41b, 42b, 43b, 44b. The terminal plates 41b, 42b, 43b, 44b on the outer surface of the body 1 are separated by a partition wall 11b as shown in FIG. Each of the movable spring plates 41a, 42a and each of the fixed plates 43a, 44a is provided with elongated contacts, which are substantially in direct contact with each other. Further, 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 movable spring plates 41 a and 41 b are connected to the second reversing plate 35 of the reversing mechanism 31 via a card 46 made of an insulating synthetic resin. The card 46 is slidably arranged so that both ends thereof are inserted into the slits 15b and 15c formed in the partition wall 15, and is arranged so as to straddle the second section 16b and the third section 16c through the slit 15b. To be done. As shown in FIG. 15, at one end of the card 46 inserted into the second section 16b, a notch groove 46a with which the second reversing plate 35 is engaged and one movable spring plate 41a are engaged. A notch groove 46b is formed. In addition, 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 card 46 slides as the second reversing plate 35 of the reversing mechanism 31 swings, and the movable spring plates 41a and 42a swing by the card 46. Stopper projections 46d and 46e that can abut against the peripheral portions of the slits 15b and 15c are provided on both peripheral portions of the wide cutout groove 46c in the sliding direction of the card 46, and when the card 46 moves. The moving range of the card 46 is regulated by contacting one of the stopper protrusions 46d and 46e with the peripheral edge of the corresponding slit 15b and 15c. That is, both stopper protrusions 46d and 46e are formed between both slits 15b and 15c, and the distance corresponding to the difference between the distance between both slits 15b and 15c and the distance between both stopper protrusions 46d and 46e is The distance is 46. At the position where the reversing mechanism portion 31 is at the reset position and the card 46 has moved to the second partition 16b side in the sliding direction, the movable spring plate 41a contacts the fixed plate 43a, and the movable spring plate 42a has a peripheral edge of the cutout groove 46c. It is pressed by and is separated from the fixed plate 44a. Further, when the reversing mechanism 31 is in the trip position and the card 46 is moved toward 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 notched. The groove 46b is pressed by the peripheral edge of the groove 46b and separated from the fixed plate 43a. In short, the movable spring plates 41a and 42a are opened and closed with respect to the corresponding fixed plates 43a and 44a.

The card 46 is provided with a test piece 46f projecting to the outside of the body 1 through the cover 12, and by operating the test piece 46f with a driver or the like, it is possible to check whether the contact device 4 is open or closed. The operation test can be done. Further, as shown in FIGS. 8 and 16, a concave step portion 11g surrounded by three surfaces is formed on the outer surface of the body 11 at a portion corresponding to one end edge of the card 46 on the side of the third partition 16c. A part of the card 46 is insertably and retractably inserted into a corner portion formed by two surfaces orthogonal to the card 46 among the three surfaces surrounding the recessed portion 11g. That is, as the card 46 slides, the amount of exposure of the card 46 to the recessed step portion 11g changes. Here, the shape of the concave step portion 11g is set so that the card 46 is hardly exposed in the concave step portion 11g when the reversing mechanism portion 31 is located at the reset position. Further, by making the body 1 black and the card 46 yellow and the like so that the body 1 and the card 46 can be easily identified, the position of the card 46 can be easily confirmed. In short, the operating state of the reversing mechanism 31 and the open / close state of the contact device 4 can be confirmed by checking the amount of protrusion of the card 46 into the concave step portion 11g.

A reset button 5 is provided on the body 11 in order to return the reversing mechanism unit 31 to the reset position via the card 46 by pushing the reversing mechanism unit 31 toward the body 11 side when the reversing mechanism unit 31 is at the trip position. It is provided. The reset button 5 is formed in a shape in which a leg portion 5b projects from one end surface of a cylindrical head portion 5a, and a disc-shaped collar portion 5c is provided in an intermediate portion of the leg portion 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 51 having a partition wall 52 parallel to the card 46 is formed. The peripheral edge of the slit groove 53 formed in the partition wall 52 of the recess 51 is formed between the one end edge of the return spring 54 made of a coil spring and the collar portion 5c, which is formed by a coil spring and is attached to the leg portion 5b of the reset button 5. The reset button 5 is urged by the return spring 54 so that the head portion 5a projects to the outer side surface of the body 11 by being sandwiched by. Therefore, the reset button 5 has a position in which the return spring 54 is maximally compressed between the head portion 5a and the partition wall 52 of the recess 51 (a position most pushed into the body 11) and a collar portion. 5c can move back and forth between the position where 5c abuts on the partition wall 52 of the recess 51 (the position most protruding from the body 11).

Of the peripheral wall of the recess 51, the peripheral wall that is parallel to the card 46 and is the outer wall of the body 11 is provided with a notch 55 that is open to the cover 12 side, and the peripheral edge of the notch 55 faces the cover 12. A semi-circular recessed notch 56 is formed in the center of the periphery. Further, inside the recess 51, as shown in FIG. 17, a stopper rib 57 and a guide rib 58 are formed. The stopper ribs 57 run in a direction substantially perpendicular to the card 46, and the guide ribs 58 extend from the outer wall of the body 11 so as to be parallel to the portion of the stopper rib 57 that is formed in parallel with the card 46. It is formed so as to be continuous with the portions formed separately. An end 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 that is sandwiched between the partition wall 15 of the body 11 and the cover 12 is disposed at a portion corresponding to the third section 16c. Positioning holes 61 are formed at two locations in the inner lid 6, and the positioning protrusions 15d protruding from the tip end surface of the partition wall 15 are inserted into the positioning holes 61 to position the inner lid 6 with respect to the body 11. Is done. As shown in FIG. 18, a holding wall 62 that holds a part of each of the terminal plates 25 and 28 is formed on the surface of the inner lid 6 that faces the cover 12. Further, as shown in FIG. 19, the inner lid 6 is integrally formed with a first protrusion 63 which is inserted into the recess 51 and a second protrusion 64 which is inserted into the third section 16c. It 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 protrusion 63 is formed in a shape that fills the portion of the notch 51 excluding the notch recess 56, and the surface facing the notch recess 56 has a circular shape together with the notch recess 56, and the reset button 5 It is formed in a semicircular cross section so as to hold the head portion 5a. The first protrusion 63 is integrally formed with a protrusion wall 65 that protrudes to the outer surface of the body 11 along the outer peripheral surface of the head 5a of the reset button 5. The protruding amount of the protruding wall 65 from the body 11 is set to be substantially equal to the maximum protruding amount of the reset button 5 from the body 11, and surrounds a half circumference of the head portion 5a of the reset button 5. Therefore, the presence of the projecting wall 65 prevents the reset button 5 from being inadvertently brought into contact with another member. A window hole 66 is formed in an intermediate portion of the projecting wall 65 in the circumferential direction, and a part of the window hole 66 is integrally connected to the first projecting base 63 and a part of the projecting wall 65 is formed inside the projecting wall 65. A guide piece 67 is provided so as to project inward from the peripheral surface. The guide piece 67 is connected to the first protrusion 63 so that the guide piece 67 can be relatively easily broken off. The tip surface of the second protrusion 64 is formed in a semicircular cross section so that the collar portion 5c of the reset button 5 can come into contact therewith and slide. Therefore, the reset button 5 is held by the slit groove 53, the notch recess 56, the first protrusion 63, the second protrusion 64, and the like so as to be able to move forward and backward without swinging.

As shown in FIG. 20, a guide protrusion 5e is provided on the peripheral surface of the head 5a of the reset button 5, and the guide protrusion 5e is arranged so as to be movable only along the guide rib 58. .. That is, the guide protrusion 5e can be moved only between the stopper rib 57 and the guide rib 58 and between the guide rib 58 and the bottom wall of the recess 51. When the guide protrusion 5e is located between the stopper rib 57 and the guide rib 58, the reset button 5 cannot be rotated and therefore moves forward and backward, so that the guide protrusion 5e moves between the guide rib 58 and the bottom wall of the recess 51. When the reset button 5 is located at the position, the reset button 5 can be rotated, but the guide rib 58 restricts the reset button 5 into the state in which the reset button 5 is pushed into the body 11, and the forward / backward movement is almost impossible. Further, the range of rotation is a position in contact with the stopper rib 57 (hereinafter referred to as a manual reset position) and a position in contact with the tip surface of the first protrusion 63 (hereinafter referred to as an automatic reset position). It is regulated in the range of about 90 degrees.

An inclined surface 5d is formed at the tip of the leg portion 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 so that the trip position side of the reversing mechanism portion 31 projects more than the reset position side. Now, when the reversing mechanism portion 31 is at the trip position, the inclined surface 5d comes into contact with the peripheral edge of the notch groove 46c of the card 46 by pushing the reset button 5, and the pressing force received from the inclined surface 5d causes The card 46 is moved so that the reversing mechanism 31 is reversed to the reset position. On the other hand, the inclined surface 5d is inclined in a direction substantially orthogonal to the sliding direction of the card 46 at the automatic reset position, and in this state, when the reversing mechanism section 31 tries to move to the trip position, the notch groove 46c of the card 46 is formed. When the leg portion 5b of the reset button 5 comes into contact with the peripheral edge of the card, the moving range of the card 46 is regulated so that the trip position is not held. That is, the movable spring plate 42a is brought into contact with the fixed plate 44a only while the pressing force from the actuating plate 38 is acting on the first reversing plate 34 of the reversing mechanism unit 31, and the first reversing plate 34 is moved to the first reversing plate 34. When the pressing force is removed, the movable spring plate 41a automatically returns to the state of contacting the fixed plate 43a. In short, it becomes stable only at the reset position, resulting in monostable operation.

A guide groove 5f into which the guide piece 67 is inserted is formed in the head portion 5a of the reset button 5 at the manual reset position. The guide groove 5f is formed along the forward / backward direction of the reset button 5, and when the guide piece 67 is inserted into the guide groove 5f, the movement of the reset button 5 is restricted so that the reset button 5 can only move forward / backward. That is, the automatic reset position cannot be set when the guide piece 67 is present. In normal use, it can be reset manually, so there is no problem in function. 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 can be broken off. A driver groove 5g is formed on the front end surface of the head 5a of the reset button 5 so that a plus driver can be inserted, and the reset button 5 can be pushed and rotated using a driver or the like. There is.

[0034]

[Effect of the device]

 As described above, the present invention forms the cam surface for restricting the further rotation of the turning lever when the turning lever comes into contact with the peripheral portion around the turning shaft so that the turning lever comes into contact. A cam body in which the rotation restricting position of the rotation lever can be adjusted by changing the position of the cam surface, and an adjustment dial that is fixed to the cam body and is rotatably operated from outside the body. And a scale which is formed on the surface of the adjustment dial and indicates that the rotary lever can contact within the effective range of the cam surface of the cam body if the reference mark provided on the body side is within the scale range. Therefore, when the rated current is adjusted by turning the adjustment dial, it is clearly known whether the cam surface of the cam body contacting the turning lever is within the effective range. There is no need to rotate the dial to adjust There is an advantage that certainly can be performed.

[Brief description of drawings]

FIG. 1 is an enlarged exploded perspective view of a main part showing an embodiment.

FIG. 2 is an explanatory diagram of an example.

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

FIG. 4 is an external perspective view of the embodiment.

FIG. 5 is an exploded perspective view of the embodiment.

FIG. 6 is a rear view of the embodiment with the cover and the inner lid removed.

FIG. 7 is a vertical sectional view of an example.

FIG. 8 is a front view of the embodiment.

FIG. 9 is a vertical sectional view of an example.

FIG. 10 is an exploded perspective view of an operating point adjusting mechanism portion used in the embodiment.

FIG. 11 is an exploded perspective view of a main part showing an embodiment.

FIG. 12 is a diagram showing an assembling process of a main part according to the embodiment.

FIG. 13 is an operation explanatory diagram of the main parts of the embodiment.

FIG. 14 is an operation explanatory diagram of the main parts of the embodiment.

FIG. 15 is a transverse cross-sectional view of a main part of the example.

FIG. 16 is a plan view of a main part of the embodiment.

FIG. 17 is a rear view showing a state in which a cover and an inner lid of a main part of the embodiment are removed.

FIG. 18 is a rear view of the embodiment with the cover removed.

FIG. 19 is a perspective view of an inner lid used in the embodiment.

FIG. 20 is a cross-sectional view of a main part of the example.

FIG. 21 is a diagram illustrating the relationship between the effective range of the cam body and the rotation angle of the adjustment dial according to the embodiment.

[Explanation of symbols]

 37 Rotating lever 37j Adjustment piece 39 Adjustment dial 39c Cam body 80 Scale Y mark

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A thermal element that is displaced according to the amount of electricity supplied, a reversing mechanism that reverses the open / closed state of a contact device when a predetermined amount of pressure is applied, and an intermediate part that pivots with respect to the body. A rotation lever that is supported and rotates within a specified range, and an intermediate portion that is swingable in the same direction as the rotation lever and that has a restricted swing range is pivotally supported by one end of the rotation lever. The displacement of the thermal element and the operating plate that presses the reversing mechanism section at the other end when the rotation lever is rotated to the maximum position within the specified range by the pressing force received by the section and the rotation is restricted In an operating point adjusting device provided in a thermal relay equipped with an interlocking plate for transmitting pressure to one end of the plate, the rotating lever, the operating plate, and the rotating lever further rotate when they abut. A cam surface that restricts the rotation of the lever is formed around the rotation axis so that the rotation lever A cam body in which the rotation restricting position of the rotation lever is adjustable by changing the position of the contacting cam surface, and an adjustment dial provided on the body for fixing the cam body and allowing the rotation operation from outside the body. , A thermal scale that is formed on the surface of the adjustment dial and that indicates that the rotary lever can contact within the effective range of the cam surface of the cam body if the reference mark provided on the body side is within the scale range. Relay operating point adjustment device.