KR101030665B1 - Thermally actuated overload relay - Google Patents

Abstract

The present invention improves the assembly structure of the adjustment link and the release lever so as to suppress the influence of thermal expansion of the outer casing of the thermal overload relay, wear of the movable shaft, and the like on the operating characteristics.

A release lever 5 that follows the displacement of the main bimetal 2, the shifter 3, the shifter 3, an output contact opening and closing mechanism 6 connected to the release lever via a reversing spring 7, and a correction current. It consists of an adjustment dial 11 for setting the flow, and an adjustment link 12 that connects between the cam portion 11a of the adjustment dial and the release lever 5, and the adjustment link includes the main shaft 12d. A thermal overload relay which pivotally supports the spindle holder 1b of 1) and then links the release lever 5 to the movable shaft portion 12e, and arranges the adjustment link 12 almost in parallel with the cam shaft of the adjustment dial. Further, the movable shaft portion 12e is disposed in direct contact with the cam portion 11a of the adjustment dial 11 as a cam follower.

Description

Thermal Overload Relay {THERMALLY ACTUATED OVERLOAD RELAY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal overload relay (thermal relay) used in combination with a magnetic contactor, and more particularly, a release lever for tripping a contact opening and closing mechanism, and a release current adjusting dial with the release lever. It relates to the assembly structure of the adjustment link connecting the between.

First, the structure of the typical prior art example of the thermal overload relay described in all is shown in FIG. 10 (for example, refer patent document 1). In Fig. 10, reference numeral 1 denotes an outer case made of mold resin, 2 denotes a main bimetal provided corresponding to each phase of a three-phase main circuit, 2a denotes a heating heater, and 3 denotes a primary bimetal ( The shifter linked to 2), 4 is a compensating bimetal (compatibility bimetal at ambient temperature) of an input lever combined with an upper lever coupled to the release lever 5 and disposed opposite to the shifter 3, 6 is a release lever 5 Contact opening and closing mechanism that trips the output as a trigger. The contact opening / closing mechanism 6 includes a reversing spring 7 that performs a snap action in response to a pressing operation of the release lever 5, a slider 8 connected to the tip of the reversing spring 7, and It consists of an assembly of output contacts 9 (contact point b) and 10 (contact point a) which are opened and closed following the movement of the slider 8. In addition, reference numeral 11 denotes an adjustment dial for setting the correction current, and 12 an adjustment link linking between the cam portion 11a of the adjustment dial and the release lever 5 as a follower member of the adjustment dial 11. 13 is a spring member for holding the adjusting dial 11 and the adjusting link 12 in the assembled position, and 14 is a reset button for manually returning the contact opening and closing mechanism 6.

Here, in the adjustment dial 11, a cylindrical cam portion (external eccentric cam) 11a protrudes inside the case and is provided at the top of the outer case 1. On the other hand, the adjustment link 12 is a seesaw-shaped link extending in the vertical direction, as shown in Fig. 11, the main shaft (12a) formed in the center portion is formed in the outer case (1) It is pivotally supported by rotation by fitting into 1a). In addition, a cam follower 12b is provided at the upper end of the adjustment link 12 so that the cam follower 12b abuts against the circumferential surface of the cam portion 11a, and then the adjustment dial 11 The adjustment link 12 is positioned in accordance with the scale (constant current value). Furthermore, a support shaft 12c is installed at the lower end of the adjustment link 12, and the release lever 5 is pivotally supported on the support shaft 12c to provide a gap between the adjustment link 12 and the release lever 5. Linked for rotation. In addition, with respect to the connection structure of the adjustment link 12 and the release lever 5, in the structure of the illustrated example, the release lever 5 is link-coupled to the support shaft 12c provided on the link side. There is also a structure in which a movable shaft support is provided on the shaft to support the release lever 5.

On the other hand, the release lever 5 linked to the adjustment link 12 is provided with an output end portion 5a that stands up from its tip and replaces the operation end 7a of the reversing spring 7. In addition, the upper end of the above-described compensation bimetal 4 is coupled to this part.

In the above configuration, when the main bimetal 2 is bent under the heating of the heater 2a according to the energization of the main circuit, and the shifter 3 moves in the direction of the arrow A shown in conjunction with this, The curvature displacement of the bimetal 2 is transmitted to the release lever 5 via the shifter 3 and the compensation bimetal 4. Thus, the release lever 5 rotates the support shaft 12c of the adjustment link 12 counterclockwise (arrow B) to the point, so that the output end 5a operates the reverse spring 7. Press step 7a. Here, when the overcurrent exceeding the correction current value set by the adjustment dial 11 is caused to pass through the main circuit, and the main bimetal 2 is greatly curved, the reverse spring pressed by the output end 5a of the release lever 5 An inversion operation (7) causes the slider 8 of the contact opening / closing mechanism 6 to move in the direction of the arrow C, and to trip the output contacts 9 and 10 by this inversion operation. Then, the magnetic contactor opens in response to the contact output signal to cut off the overcurrent of the main circuit. In addition, after the main circuit is disconnected (the main bimetal 2 returns to normal temperature and returned to its original state), when the safety of the power distribution path is confirmed and the reset button 14 is pressed, the slider 8 moves leftward. (In the opposite direction to arrow C), the contacts 9 and 10 are restored, and the reversing spring 7 is forcibly inverted to its original state to reset the thermal relay.

In addition, when the setting value of the correction current is changed by the adjustment dial 11, the adjustment link 12 linked to the cam part 11a of the adjustment dial 11 has the main shaft 1a as a point, and the movable shaft part ( It is well known that 12c) moves to the left and right directions, whereby the relative positions of the release lever 5 and the reverse spring 7 are displaced to change the operating point of the thermal relay.

In addition, with respect to the adjustment link 12 (termination member of the adjustment dial), instead of the seesaw type link shown in Fig. 11, a main shaft is provided at the lower end of the link and pivotally supported on the outer case, and then the link is stopped. It is also known to have a configuration in which the movable shaft portion is provided at the position and is linked with the release lever (see Patent Document 2, for example).

[Patent Document 1] Japanese Patent Laid-Open No. 2005-116370 (Fig. 4)

[Patent Document 2] Japanese Utility Model Publication No. S53 (1978) -95168 (Fig. 1)

However, the thermal overload relay of the conventional structure has a problem that the operation characteristics are changed due to the deformation of the outer case due to the change of the environment (temperature, humidity) of the place of use, the wear of the movable shaft part due to the actual use, the backlash, and the like. There is. In other words,

If the movable shaft is worn out due to the long-term use of the thermal relay, and this causes the backlash in the movable shaft between the adjusting link 12 and the release lever 5, it operates as if the outer case 1 is deformed. There is a problem that the characteristic is changed, the appearance will be described by the schematic analysis of FIG. In addition, in the model shown in FIG. 12, for the convenience of explanation, the release lever 5 is pivoted when the support shaft 5b is supported by the movable shaft part (bearing shaft) of the adjustment link 12 (refer FIG. 10). It is possibly linked. 12 (a) is a normal state, (b) is an operation explanatory diagram of a state in which the back shaft occurs between the bearing of the adjustment link 12 due to the wear of the support shaft (5b), I, II in the drawings , III are different operating states, X1 is the initial position of the shifter 3, X2, X3 are driven at the bending displacement of the main bimetal (not shown), and the release lever 5 is brought into contact with the reversing spring 7 The shift position of the shifter 3 to be pressed is shown.

First, in a steady state in which the support shaft 5b is not worn (see Fig. 12 (a)), the shifter 3 is displaced in the direction of arrow A from the position Ｘ1 of the initial state I and moved to the position of X2. When it reaches (II), the release lever 5 rotates counterclockwise about the support shaft 5b, and presses the reversing spring 7. The shift amount of the shifter 3 at this time is δ.

On the other hand, in Fig. 12 (b), when the support shaft 5b is worn out from the steady state I, the bearing of the adjustment link 12 and the release lever 5 are moved at the initial position X1 of the shifter 3. Backlash (looseness) occurs between the support shaft 5b (state II). In this state, the main bimetal 2 is bent by the energizing heating of the main circuit, and the shifter 3 driven by this presses the tip of the compensating bimetal 4 in the direction of the arrow A. With the stop at the initial position (a position indicating “6 o'clock of the clock; state II), the release lever 5 rotates counterclockwise about the support shaft 5b and abuts against the reverse spring 7. However, in this state, since there is a backlash (looseness) between the support shaft 5b and the bearing, no force is generated to press the reverse spring 7. From this position, the shifter 3 further pushes the compensating bimetal 4 in the direction of the arrow A, so that the release lever 5 rotates counterclockwise at the point of contact with the reversing spring 7 as a point, and at the same time, worn support The shaft 5b moves to the right along the inner circumferential surface of the bearing. Then, when the shifter 3 moves to the position of X3, the support shaft 5b moves to the position of "three o'clock" of the watch and is pressed at this position (state III). In this state, when the shifter 3 is further displaced in the A direction, the release lever 5 moves to rotate the support shaft 5b counterclockwise to the point to invert the reverse spring 7.

In this case, in the conventional structure of FIG. 10, the release lever opposed to the reverse spring 7 when viewed from the input end of the release lever 5 (the force point at which the shifter 3 presses the compensation bimetal 4). The output end of (5) is located further ahead of the support shaft 5b. For this reason, when the support shaft 5b wears and a backlash has generate | occur | produced between bearings, the shift amount of the shifter 3 which is necessary to compensate for the backlash powder (looseness) and reverse operation of the inversion spring 7 becomes large. .

That is, when the support shaft 5b is worn out and backlash (relax (ε), see state III) occurs between the bearings, the backlash powder is compensated for and the shifter 3 necessary to press the reverse spring 7 The movement amount ζ is enlarged compared with the movement amount δ in the steady state described in FIG. 12 (a). For this reason, the operating characteristics of the thermal relay change as the outer case 1 is deformed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and the problem is to solve the above problems, and to reduce the influence of the deformation of the outer case and the wear of the movable shaft on the operating characteristics to reduce the adjustment link, release to improve the reliability It is to provide a thermal overload relay with improved lever assembly structure.

MEANS TO SOLVE THE PROBLEM According to this invention, according to this invention, the main bimetal which is bent and displaced by the energization heating of main circuit electric current, the shifter connected to the main bimetal, the release lever which follows the displacement of the shifter, and an output contact point A contact opening / closing mechanism connected to the release lever via a reverse spring, an adjustment dial having a cam for setting a correction current, and a linking member between the cam portion of the dial and the release lever as a termination member of the adjustment dial. A thermal overload relay that incorporates an assembly of an adjusting link in an outer case and detects the bending displacement of the main bimetal due to energization of overcurrent, and trips the output contact, wherein the adjusting link pivots the main shaft to the outer case. Next, in linking the release lever to the movable shaft of the adjustment link,

(1) The adjustment link has a structure having a main shaft at one end thereof and a movable shaft portion connected to the release lever at the other end thereof, and the movable shaft portion is brought into direct contact with the cam portion of the adjustment dial as a cam follower. (Claim 1).

(2) In the above (1), the adjusting link is disposed almost parallel to the cam shaft of the adjusting dial (claim 2).

(3) The output end of the release lever opposite to the inverting spring is disposed at the position of the input end side of the release lever linked to the shifter of the main bimetal when viewed from the movable shaft portion of the adjustment link coupled to the release lever (claims). 3).

(4) The method according to the above (3), wherein the output end of the release lever is formed on the compensating bimetal itself, which is provided to engage one end with the release lever and connect the other end with the shifter of the main bimetal, to face the reverse spring. (Claim 4).

(5) The assembly according to (3), wherein the assembly includes an input lever disposed to couple one end to the release lever and to connect the other end to the shifter of the main bimetal, and wherein the output end of the release lever is input to the input lever. It is formed in the lever itself so as to face the reverse spring (claim 5).

(6) Furthermore, combining the structures of (1) and (3) above, the adjustment link has a movable shaft portion connected to a main shaft on one side and a release lever on the other side, and the movable shaft portion is a cam follower ( and the output end of the release lever opposed to the inverting spring on the input end side of the release lever which is connected to the shifter of the main bimetal when viewed from the movable shaft of the adjustment link. (Claim 6).

Of the parts constituting the thermal overload relay, the following effects are obtained by the arrangement and arrangement of the adjustment link, which is the termination member of the adjustment dial, and the release lever connected to the adjustment link to face the reverse spring. Can be.

(1) By arranging the movable shaft portion of the adjustment link as a cam follower directly against the circumferential surface of the cam portion of the adjustment dial, deformation of the outer case due to the environment (temperature, humidity) of the place of use, and the movable shaft portion according to actual use Even if the main shaft of the adjustment link is displaced from the original position due to wear, backlash, or the like, the movable shaft portion at the front end side of the link comes in contact with the cam portion of the adjustment dial and is held at a position corresponding to the correction current value. Therefore, since the release lever linked to the movable shaft is also positioned and held at a position corresponding to the correction current value, the influence on the operating characteristics due to the deformation of the outer case can be reduced accordingly.

(2) In this case, in the original assembly state, by arranging the adjustment link almost parallel to the cam axis of the adjustment dial, the main axis of the adjustment link pivoted to the outer case is left and right in accordance with the deformation of the outer case. Even if it is displaced by, the movable shaft portion is only moved up and down in parallel along the cylindrical cam surface of the adjustment dial, thereby making it possible to suppress the influence on the operating characteristics small.

(3) In addition, the output end of the release lever opposite to the reverse spring is disposed on the input end side of the release lever linked to the shifter of the main bimetal when viewed from the movable shaft of the adjustment link linking the release lever. Even when the support shaft parts are worn out and backlash occurs in the movable shaft part of the adjustment link during use, the operation characteristics can be suppressed by reducing the displacement of the relative position between the output end of the release lever and the reverse spring opposed thereto during operation. Can mitigate the impact of

(4) Furthermore, by using the arrangement of the adjustment link and the structure of the release lever in combination, it is possible to provide a reliable thermal overload relay with a low suppression of the influence of the high temperature and high humidity environment and the wear of the shaft portion on the operating characteristics.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the examples shown in FIGS. 1 to 9. 1 to 3 are explanatory diagrams of the structure and operation according to the first embodiment of the present invention, FIGS. 4 to 6 are explanatory diagrams of the configuration and operation according to the second embodiment, and FIGS. 7 to 9 are applications. In the drawings of the embodiments, the same reference numerals are used for members corresponding to FIGS. 10 and 12 in the drawings of each embodiment, and description thereof will be omitted.

(Example 1)

FIG. 1 is an assembly configuration diagram of a thermal overload relay corresponding to claims 1 and 2 of the present invention, and FIG. 2 is a perspective view of the structure of the main part of FIG. 1, wherein the outer case 1 includes a main bimetal 2 and a shifter. (3), the compensating bimetal 4, the release lever 5, the contact opening and closing mechanism 6 including the reversing spring 7, and the components of the adjustment dial 11 are conventional thermal type shown in FIG. It is arranged similarly to the overload relay, wherein the adjusting link 12 which connects between the release lever 5 and the cam portion 11a of the adjusting dial 11 is shown in the embodiment shown in FIGS. 10 and 11. different.

That is, the adjustment link 12 has a main shaft 12d as a fixed shaft portion at the upper end side of the link member, and a movable shaft portion 12e at the lower end side, and juxtaposed on the side of the adjustment dial 11. The spindle 12d is pivotally supported on the spindle holder (basket) 1b formed in the outer case 1, and is held in a down position. On the other hand, the movable shaft portion 12e on the lower side is brought into contact with the cam portion (cylindrical external cam; 11a) of the adjustment dial 11 as a cam follower, and the movable shaft portion 12e is released through the support shaft 5b. The lever 5 is link-coupled, and its output end 5a is opposed to the operation end 7a of the reverse spring 7. In this part assembly state, the adjusting link 12 is disposed almost parallel to the camshaft of the adjusting dial 11.

In addition, in this embodiment, although the cam part 11a of the adjustment dial 11 was made cylindrical, only the part which abuts with the movable shaft part 12e of the adjustment link 12 in the cam part 11a of the adjustment dial 11 is cylindrical. It may be a prize.

Next, a description will be given of the effect on the operating characteristics when the outer case 1 is deformed due to tripping operation, thermal expansion, swelling, and the like during overcurrent energization according to the above configuration.

First, in the steady state, the movable shaft portion 12e of the adjusting link 12 is pressed against the circumferential surface of the cam portion 11a of the adjusting dial 11, and the release lever 5 is axially supported by the movable shaft portion 12e. And the relative position with the reversing spring (7) in accordance with the scale of the adjustment dial (11). Here, when the overcurrent exceeding the set value of the correction current flows to the main circuit, and the shifter 3 is displaced in the direction of the arrow A by the main bimetal 2 that is bent under the energizing heating, the release lever 5 is adjusted. The reverse spring 7 is reversed by rotating the movable shaft portion 12e of (12) in a counterclockwise direction (arrow B). Thereby, the slider 8 associated with the reversal spring 7 moves in the direction of arrow C, and the output contacts 9 and 10 change. Further, when the adjustment dial 11 is turned to change the set value of the correction current, the adjustment link 12 serving as the termination member changes the relative position of the release lever 5 / reversing spring 7 to change the trip operation point.

Next, the influence on the operating characteristics by the deformation of the outer case (1) will be described with reference to FIG. That is, due to the deformation of the outer case 1 due to thermal expansion or the like, the main shaft holder 1b and the main shaft 12d of the adjustment link 12 pivoted thereto are indicated by the dashed line from the original position P1 indicated by the solid line. When displaced to the position between the left and right positions P2 and P3, the movable shaft portion 12e only slightly moves in parallel in the vertical direction while being in contact with the cam portion 11a of the adjustment dial 11, and there is no displacement in the left and right directions. Furthermore, when the length of the adjustment link 12 is calculated to be, for example, 10 mm, even when the left and right displacement amount w of the main shaft 12d is 1 mm, the vertical displacement amount h of the movable shaft portion 12e is only 0.0125 mm. Can not be done.

Thus, the relative position of the release lever 5 and the reversing spring 7 and the relative position of the shifter 3 of the main bimetal 2 connected to the tip and the compensation bimetal 4 connected to the release lever 5 ( There is little change. Thereby, the influence on the operating characteristic resulting from the deformation | transformation of the outer case 1 which concerns on a conventional structure can be reduced.

(Example 2)

Next, the structure, function, and operation of the embodiment corresponding to claims 3 and 5 of the present invention will be described with reference to FIGS. 4 to 6. This embodiment forms the release lever 5 linked to the movable shaft portion 12e of the adjustment link 12 in the configuration of the first embodiment as described below, and wears the shaft portion to generate backlash. Even in this case, it is possible to further improve the reliability by suppressing the influence on the operation characteristics low.

That is, in the conventional structure disclosed by FIG. 10 or patent document 2, the output end part 5a of the release lever 5 which opposes the reversal spring 7 is stood up. Therefore, when viewed from the input end of the release lever 5 (the tip of the compensating bimetal 4 having one end coupled to the release lever 5 and linked to the shifter 3), the output end 5a of the release lever 5 is present. Protrudes forward from the support shaft 5b. For this reason, when the support shaft 5b wears and the backlash generate | occur | produced between the movable shaft part 12e of the adjustment link 12, operation characteristic will change significantly as described in the analysis diagram of FIG. do.

On the other hand, in the configuration of the embodiment shown in Figs. 4 and 5, in contrast to the conventional structure, the output end portion 5a protrudes downward from the distal end of the release lever 5 so as to operate the operation end of the inversion spring 7 ( It is formed to face 7a). As a result, when viewed from the input end of the release lever 5 (the force point at which the shifter 3 presses the compensation bimetal 4), the output end 5a of the release lever 5 moves to the movable shaft portion 12e of the adjustment link 12. It is located in front of the support shaft (5b) connected to the lower (below in Figure 4) to oppose the operating end (7a) of the reversing spring (7). In addition, according to this arrangement, in the embodiment of Fig. 4, the moving direction of the shifter 3 following the movement of the main bimetal 2 curved by energizing heating is set to face to the left as indicated by arrow A. .

Next, Figs. 6A and 6B show the effects on the tripping operation of the thermal relay and the operating characteristics due to the wear of the support shaft 5b according to the above structure in correspondence with Figs. Explain through the schematic diagram in (b). First, in the steady state in which the support shaft 5b is not worn (see Fig. 6 (a)), the shifter 3 is displaced in the direction of arrow A from the position # 1 at the initial position I to move to the position X2. When it is II, the release lever 5 rotates clockwise about the support shaft 5b to press the reverse spring 7. The shift amount of the shifter 3 at this time is δ as in FIG. 12 (a).

On the other hand, in Fig. 6 (b), when the support shaft 5b is worn out from the steady state I, the movable shaft portion 12e and the release of the adjustment link 12 are released at the initial position X1 of the shifter 3. Backlash (looseness) occurs between the support shaft 5b of the lever 5 (state II). In this state, when the shifter 3 follows the curvature of the main bimetal 2 and pushes the input end of the release lever 5 in the direction of the arrow A, the release lever 5 reverses through the state II → III. Press (7).

That is, when the shifter 3 moves from the initial position X1 to the same position as Ｘ2 in the diagram (a), the release lever 5 rotates clockwise about the support shaft 5b to the reverse spring 7. In this state, however, backlash (looseness) exists between the support shaft 5b and the bearing, so that a force for pressing the reverse spring 7 does not occur. When the shifter 3 further moves in the direction of arrow A from this position, the release lever 5 rotates clockwise in a seesaw manner with the point of contact with the inversion spring 7 as a point. Thus, when the support shaft 5b moves to the right along the inner circumferential surface of the movable shaft portion 12e, and the shifter 3 moves to the position of X3, the backlash powder ε is compensated to press the reverse spring 7. .

In this operation process, when the movement amount η from the initial position X1 to X3 of the shifter 3 and the movement amount ζ shown in FIG. 12 (b) are compared, η <ζ, and the supporting shaft 5b accordingly. ), The impact on tripping characteristics is reduced due to abrasion, and the reliability of the product is improved.

(Example 3)

Next, as a modification of the second embodiment, an application example of the present invention in which the arrangement of the adjustment link 12 is changed is shown in Figs.

That is, in the embodiment of Fig. 4, the outer case (12d) and the movable shaft portion 12e to the upper side and the movable shaft portion 12e to the lower side with respect to the main shaft 12d and the movable shaft portion 12e formed on both ends of the adjustment link 12. The spindle 12d is pivotally supported by the spindle holder 1b formed on the top side of 1). On the other hand, in the structure of FIG. 7, the partition wall part which isolate | separates between the contact opening and closing mechanism 6 arrange | positioned at the upper side of the outer case 1, the adjustment dial 11, and the main bimetal 2 arrange | positioned at the lower side. The main shaft holder 1b is formed at 1w to pivotally support the main shaft 12d of the adjustment link 12, and the cam portion 11a of the adjustment dial 11 uses the movable shaft portion 12e on the upper side as a cam follower. It is supposed to be close to. With this arrangement, the outer casing 1 can be configured compactly and compactly by moving the adjusting link 12 from the side of the adjusting dial 11 to an empty space below.

7, the inverted L-shaped output end 5a protrudes toward the reversal spring 7 from the front end, and has the back surface of this output end 5a. The upper end of the compensating bimetal 4 is coupled to the surface, and as an alternative embodiment of the compensation bimetal 4, the configuration of FIG. 9 corresponding to Claims 4 and 5 of the present invention may be adopted.

That is, in the configuration of FIG. 9, the upper end of the compensation bimetal 4 or the input lever 15 made of ordinary metal or resin material is coupled to the release lever 5, and then the compensation bimetal 4 or the input lever ( 15, convex output end portions 4a and 15a corresponding to the output end portions 5a of Fig. 8 are formed to protrude toward the inversion spring. The input lever 15 also links the lower end to the shifter 3 (see FIG. 7) similarly to the compensation bimetal 4.

On the other hand, in Examples 1 to 3 described above, one end of the adjustment link 12 is the main shaft 12d, and the main shaft 12d is pivotally supported by the main shaft holder 1b formed on the outer case 1 side. One end of the adjustment link 12 may be a main shaft holder to form a main shaft on the outer case 1 side.

1 is an assembly configuration diagram of the thermal overload relay according to the first embodiment of the present invention.

FIG. 2 is a perspective view of the main part structure of FIG. 1. FIG.

3 is an operation explanatory diagram showing the behavior of the adjustment link when the outer case is deformed in the configuration of FIG.

4 is an assembly configuration diagram of the thermal overload relay according to the second embodiment of the present invention.

FIG. 5 is a perspective view of the main part structure of FIG. 4. FIG.

6 is an operation explanatory diagram according to the configuration of FIG. 4, wherein (a) and (b) are schematic analysis diagrams showing the behavior of the release lever in a steady state and a worn state of the support shaft, respectively.

7 is an assembly configuration diagram of the thermal overload relay according to the third embodiment of the present invention.

FIG. 8 is a perspective view of the main part structure of FIG. 7. FIG.

FIG. 9 is a structural perspective view of an embodiment in which some components in FIG. 8 are modified.

10 is a configuration diagram of a conventional example of a thermal overload relay.

FIG. 11 is a perspective view of the adjustment link in FIG. 10.

FIG. 12 is an explanatory view of the operation according to the configuration of FIG. 10, wherein (a) and (b) are schematic analysis diagrams showing the behavior of the release lever in a steady state and a worn state of the support shaft, respectively.

                Explanation of symbols on the main parts of the drawings

1: outer case 1b: spindle holder

2: main bimetal 3: shifter

4: reward bimetal 5: release lever

5a: Output end 6: Output contact opening and closing mechanism

7: reverse spring 9,10: output contact

11: adjustment dial 11a: cam portion

12: adjusting link 12d: spindle

12e: movable shaft 15: input lever

Claims (6)

A main bimetal that is bent and displaced by energizing heating of the main circuit current, a shifter connected to the main bimetal, a release lever that follows the displacement of the shifter, and an output contact and a reverse spring on the release lever An assembly of a contact opening / closing mechanism associated with the through hole, an adjustment dial with a cam for setting a settled current, and an adjustment link connecting between the cam portion of the dial and the release lever as a termination member of the adjustment dial. A thermal overload relay built in a case and detecting the bending displacement of the main bimetal according to the energization of overcurrent, and tripping the output contact, wherein the adjusting link pivots the main shaft to the outer case, and then In linking the release lever to the movable shaft, The adjusting link has a main shaft at one end thereof and a movable shaft part connected to the release lever at the other end thereof, and the movable shaft part is disposed in direct contact with the cam part of the adjusting dial as a cam follower. And an output end portion of the release lever opposite to the inverting spring is disposed at an input end side of the release lever connected to the shifter of the main bimetal when viewed from the movable shaft portion of the adjustment link. The method of claim 1, Thermal overload relay, characterized in that the adjustment link is arranged in parallel with the cam shaft of the adjustment dial. delete The method of claim 1, A thermal overload relay, characterized in that the output end of the release lever is formed on a compensating bimetal itself that is coupled to one end of the release lever and to the other end of the main bimetal shifter. The method of claim 1, The assembly has an input lever coupled to one end of the release lever and attached to the other end of the shifter of the main bimetal, and an output end of the release lever is formed on the input lever itself. relay. A main bimetal that is bent and displaced by energizing heating of the main circuit current, a shifter connected to the main bimetal, a release lever that follows the displacement of the shifter, and an output contact and connected to the release lever through a reverse spring. The contact opening and closing mechanism, an adjustment dial with a cam for setting the correction current, and an assembly of an adjustment link for connecting the cam portion of the dial and the release lever as a termination member of the adjustment dial are built into the outer case, A thermal overload relay which detects the bending displacement of the main bimetal according to the energization and trips the output contact, wherein the adjusting link pivots the main shaft to the outer case and then links the release lever to the movable shaft of the adjusting link. In combination, The adjustment link is provided with a main shaft at one end side and a movable shaft portion at the other end, and the movable shaft portion is disposed in direct contact with the cam surface of the adjustment dial as a cam follower, and at the same time, a link is made to the movable shaft portion. A thermal overload relay, characterized in that the operating end of the release lever, which is coupled to the reverse spring, is disposed on the input end side of the release lever connected to the shifter of the main bimetal when viewed from the movable shaft of the adjustment link.

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