JP2005302677A - Relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a relay wherein the life time of a main contact becomes long by reducing chattering time only by adding a simple work. <P>SOLUTION: A moving contact 40 having a movable contact point 41 is held by an interlocking lever 31 rotating around a shaft pin 33 according to the movement of a plunger 27 of a polar electromagnet 20. A fulcrum projection 36A abutted on the moving contact 40 is provided in the interlocking lever 31. A contact pressure spring 34 energizing the moving contact 40 with the fulcrum projection 36A as a fulcrum for obtaining a spring load of the movable contact point 41 against the fixed contact point 51 is provided. The fulcrum projection 36A is provided with a plurality of fulcrums a, b changing a fulcrum position of the moving contact 41 in a direction that the spring load of the movable contact point 41 contacted with the fixed contact point 51 rapidly increases. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a relay.

  Conventionally, a polarized electromagnet having a single-winding type coil in which the plunger advances and retreats according to the direction of energization of the coil, and a shaft pin that is rotatably supported around a shaft pin provided at a fixed position. An interlocking lever that is coupled and rotates around the shaft pin in accordance with the advancement and retraction of the plunger, a movable contact that is held by the interlocking lever and has a movable contact at one end, a fixed contact that is separated from the movable contact, and a coil A switching contact that is inserted into the feeding path and selects the feeding path to the coil from two feeding paths in conjunction with the advance and retreat of the plunger, and the direction of the current passing through each feeding path that is selected by the switching contact is regulated to be opposite to each other There is a relay provided with a backflow prevention element in the case (see Patent Document 1).

The interlock lever is provided with a fulcrum protrusion that abuts the movable contact, and the contact pressure for energizing the movable contact with the fulcrum protrusion as a fulcrum to obtain a spring load of the movable contact with respect to the fixed contact. A spring is provided.
JP-A-6-203721

  However, since the fulcrum protrusion of the interlocking lever is semicircular, when the movable contact is urged by a contact pressure spring with the semicircular fulcrum protrusion as a fulcrum, the movable contact is brought into contact with the fixed contact. Since the fulcrum position does not change, the spring load of the movable contact only increases linearly and slowly, so there is a problem that chattering time increases and the life of the main contact (movable contact and fixed contact) is shortened. It was.

  The present invention has been made to solve the above problems, and it is an object of the present invention to provide a relay in which the chattering time is reduced and the life of the main contact is increased only by adding a simple device.

In order to solve the above-mentioned problem, the invention of claim 1 has a single-winding type coil, and a polarized electromagnet in which a plunger advances and retreats in accordance with the direction of energization of the coil, and a shaft pin provided at a fixed position. An interlocking lever that is freely supported and coupled to the plunger at a position different from the axis pin and rotates around the axis pin according to the advancement and retraction of the plunger, a movable contact that is held by the interlocking lever and has a movable contact at one end, A stationary contact that is separated from the movable contact, a switching contact that is inserted into the power feeding path to the coil and selects the power feeding path to the coil from two power feeding paths in conjunction with the advance and retreat of the plunger, and each power feeding selected by the switching contact A relay provided with a backflow prevention element in the case for restricting the directions of current passing through the path in opposite directions,
The interlocking lever has a fulcrum projection that abuts on the movable contact, and a contact pressure spring for energizing the movable contact with the fulcrum projection as a fulcrum to obtain a spring load of the movable contact with respect to the fixed contact. The fulcrum protrusion is provided with a plurality of fulcrum points that change the fulcrum position of the movable contact in a direction in which the spring load of the movable contact that contacts the fixed contact increases rapidly. .

  A second aspect of the present invention is the relay according to the first aspect, wherein the fulcrum of the fulcrum protrusion is formed in a curved shape.

The invention according to claim 3 is a polar electromagnet having a one-winding type coil in which a plunger advances and retreats in accordance with the direction of energization of the coil, and a shaft pin that is rotatably supported around a shaft pin provided at a fixed position. An interlocking lever that is coupled to the plunger at different positions and rotates around the shaft pin according to the advancement and retraction of the plunger, a movable contact that is held by the interlocking lever and has a movable contact at one end, and a fixed contact that is separated from the movable contact And a switching contact that is inserted into the power feeding path to the coil and selects the power feeding path to the coil from two power feeding paths in conjunction with the advance and retreat of the plunger, and the direction of the current passing through each power feeding path selected by the switching contact A relay provided in the case with a backflow prevention element that regulates in opposite directions,
The interlocking lever has a fulcrum projection that abuts on the movable contact, and a contact pressure spring for energizing the movable contact with the fulcrum projection as a fulcrum to obtain a spring load of the movable contact with respect to the fixed contact. The contact pressure spring provided is a conical coil spring.

According to a fourth aspect of the present invention, there is provided a polarized electromagnet having a one-winding type coil in which a plunger advances and retreats in accordance with an energization direction of the coil, and a shaft pin rotatably supported around a shaft pin provided at a fixed position. An interlocking lever that is coupled to the plunger at different positions and rotates around the shaft pin according to the advancement and retraction of the plunger, a movable contact that is held by the interlocking lever and has a movable contact at one end, and a fixed contact that is separated from the movable contact And a switching contact that is inserted into the power feeding path to the coil and selects the power feeding path to the coil from two power feeding paths in conjunction with the advance and retreat of the plunger, and the direction of the current passing through each power feeding path selected by the switching contact A relay provided in the case with a backflow prevention element that regulates in opposite directions,
The interlocking lever has a fulcrum projection that abuts on the movable contact, and a contact pressure spring for energizing the movable contact with the fulcrum projection as a fulcrum to obtain a spring load of the movable contact with respect to the fixed contact. The fulcrum protrusion is provided with a plurality of fulcrum points for changing the fulcrum position of the movable contact in a direction in which the spring load of the movable contact in contact with the fixed contact is rapidly increased. It is a conical coil spring.

  According to the first aspect of the present invention, a plurality of fulcrums that change the fulcrum position of the movable contact in the direction in which the spring load of the movable contact that contacts the fixed contact suddenly increases are set on the fulcrum protrusion of the interlocking lever. Since the spring load of the contact increases rapidly, the chattering time is reduced and the life of the main contact is extended. In addition, since a plurality of fulcrums are only set on the fulcrum protrusions of the interlocking lever, the structure is simple.

  According to the invention of claim 2, since the plurality of fulcrums of the fulcrum protrusion are formed in a curved shape, the spring load of the movable contact is abrupt but rises in a curve, so that the contact operation of the movable contact becomes smooth.

  According to the invention of claim 3, since the contact pressure spring is a conical coil spring, compared to a normal coil spring, the conical coil spring has a stronger spring force as it expands. It goes up.

  According to the invention of claim 4, the fulcrum protrusion of the interlocking lever is set with a plurality of fulcrum points that change the fulcrum position of the movable contact in the direction in which the spring load of the movable contact that contacts the fixed contact increases rapidly. Since the pressure spring is a conical coil spring, the functions and effects of claims 1 and 3 are provided.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view of the relay, and FIG. 2 is a partially cutaway side view with the cover removed. The relay case 10 is set to a single module size (unit size) standardized as a distribution board agreement size, and has a box-shaped body 11 with an open side surface and a cover that covers the opening surface of the body 11. Twelve. The body 11 and the cover 12 insert the caulking pin 15 into the assembly holes 13 and 14 formed in the body 11 and the cover 12, and the front end portion of the caulking pin 15 protruding on the side surface of the body 11 opposite to the cover 12. They are joined together by caulking. The case 10 is formed with an auxiliary space 16 in which parts for enhancing functionality can be stored, and the peripheral surface of the case 10 corresponding to the auxiliary space 16 is open. Accordingly, the closing plate 17 is mounted so as to close the opening when not storing a component for high functionality.

  A polarized electromagnet 20 is accommodated in the case 10. The polarized electromagnet 20 includes two yokes 21 formed in a substantially U shape, and the yokes 21 are disposed so as to face each other with a gap 22 between the front end surfaces of the leg pieces. One magnetic pole of the permanent magnet 23 abuts on the central piece of the yoke 21, and the auxiliary yoke 24 is coupled to the other magnetic pole of the permanent magnet 23. The auxiliary yoke 24 is disposed so as to surround the coil frame 26 around which the coil 25 is wound, and a plunger 27 is inserted into the coil frame 26 so as to be able to advance and retract in the axial direction of the coil frame 26. The plunger 27 is fixed with two armatures 28 that abut against the yoke 21 or the auxiliary yoke 24 at the time of advance and retreat to restrict the movement range of the plunger 27 and form a magnetic circuit. The coil 25 is a single-winding type, and the plunger 27 moves forward and backward according to the direction of energization of the coil 25, and the plunger 27 is held at the stop position by the magnetic force of the permanent magnet 23. That is, at the stop position, a closed magnetic path of the path of permanent magnet 23-auxiliary yoke 24-armature 28-plunger 27-armature 28-yoke 21-permanent magnet 23 is formed, and the plunger 27 is held in that position. is there. In the armature 28, a non-magnetic material-made progressive plate 28a is fixed to the contact surface with the yoke 21 so that the armature 28 can be easily detached from the state attracted by the yoke 21. The polarized electromagnet 20 is disposed between the partitioning pieces 11 f and 11 g projecting on the surface of the body 11 facing the cover 12, and a buffer spring 19 made of a leaf spring is formed between the partitioning piece 11 g and the polarized electromagnet 20. By being sandwiched therebetween, the polarized electromagnet 20 is fixed while being pressed against the partition piece 11f. Therefore, the poled electromagnet 20 is fixed by the buffer spring 19 and vibration associated with the advancement / retraction of the plunger 27 is alleviated by the buffer spring 19.

  An interlocking lever 31 made of synthetic resin, which is an insulating material, is rotatably coupled to one end of the plunger 27 in the advancing / retreating direction by a shaft pin 32. That is, a part of the plunger 27 is inserted into a groove 31b formed in the interlocking lever 31, and the plunger 27 is inserted into the bearing protrusion 31c projecting in the groove 31b. It is attached to 31c. The interlocking lever 31 is pivotally supported by two shaft pins 33 that are inserted through a pair of support pieces 26 a that protrude from the outer peripheral surface of the coil frame 26 of the polarized electromagnet 20. Each shaft pin 33 is inserted into the interlocking lever 31 through the support piece 26a, and the both shaft pins 33 are arranged in a straight line. However, the length of the shaft pins 33 does not contact each other inside the interlocking lever 31. Is set. Inside the interlocking lever 31, a synthetic resin that is a constituent material of the interlocking lever 31 exists between the shaft pins 33, and the shaft pins 33 are insulated. The shaft pin 32 and the shaft pin 33 are parallel to each other, and when the plunger 27 reciprocates, the interlocking lever 31 swings around the shaft pin 33.

  The interlocking lever 31 has a partition plate 31a, and contact holder holding bases 31d project from the left and right side surfaces of the partition plate 31a, and the concave groove 31b is formed in the contact holder holding base 31d. On both side surfaces of the partition plate 31a, spring receiving projections 31e formed in a substantially U-shape with an opening surface facing the contact holder support 31d are also provided. The spring receiving projection 31e holds one end of the contact pressure spring 34 made of a conical coil spring. The other end of the contact pressure spring 34 is in elastic contact with the movable contact 40 inserted between the contact holding base 31d and the spring receiving projection 31e.

  The movable contact 40 has a strip shape, and a movable contact 41 is fixed to one end in the longitudinal direction, and a terminal plate 43 is connected to the other end via a connecting wire 42 made of a braided copper wire. A terminal screw 44 with a washer is screwed onto the terminal plate 43. Further, a projecting portion 45 serving as a seat for the contact pressure spring 34 is formed at an intermediate portion in the longitudinal direction of the movable contact 40, and a positioning hole 46 is formed below the projecting portion 45. A positioning protrusion 35 protruding from the interlocking lever 31 is inserted into the positioning hole 46.

  The interlocking lever 31 is provided with a fulcrum protrusion 36 </ b> A of the first embodiment in which the movable contact 40 abuts on the side of the positioning protrusion 35. The fulcrum protrusion 36A has a substantially trapezoidal shape in a side view.

  As shown in detail in FIG. 3, the fulcrum protrusion 36 </ b> A is a distance L <b> 1 (a distance corresponding to about 3 to 4 times the conventional fulcrum protrusion 36 </ b> C described below) from the center axis C of the plunger 27 (movable contact 41 side). ), A rounded edge-shaped first fulcrum a is set near the lower end, and a flat surface-shaped second fulcrum b is set at an intermediate portion between the upper end.

  As shown in detail in FIG. 4, the fulcrum protrusion 36 </ b> B of the second embodiment has a substantially L shape in a side view, and is a distance L <b> 2 downward from the central axis C of the plunger 27 (movable contact 41 side). The first fulcrum a with a rounded edge is set in the vicinity of the lower end, and the first fulcrum a between the upper end and the upper end is extended at a distance corresponding to about 4 to 5 times the conventional fulcrum protrusion 36C described below. An arc-shaped second fulcrum c is set at the intermediate portion.

  5 is a partially cutaway side view of the relay disclosed in Patent Document 1 with the cover removed, and the conventional fulcrum protrusion 36C has a semicircular shape located on the central axis C of the plunger 27. FIG. Yes, the contact pressure spring 34 'is not a conical coil spring but a normal coil spring. Further, as will be described later, the contact operating piece 37 'of the interlocking lever 31 inserted between the movable contact plates 63a and 63b has a height as high as H'.

  A movable electromagnetic iron piece 47 is fixed to the end of the movable contact 40 below the movable contact 41. At the upper end of the interlocking lever 31, a display piece 38 that faces the display window 10a that opens in the case 10 is integrally provided, and the characters "ON" and "OFF" are written on the display piece 38. Further, an operation groove 38a is formed in a portion of the display piece 38 between the characters "ON" and "OFF", which is always exposed from the display window 10a, and displays a tool such as the tip of the driver. The interlocking lever 31 can be manually operated from the outside of the case 10 by being inserted into the window 10a and engaged with the operation groove 38a.

  The fixed contact 51 facing the movable contact 41 is fixed to one end of a fixed terminal plate 50 formed by bending a conductive metal plate and fixed to the case 10. The other end of the fixed terminal plate 50 is fixed to the case 10. Exposed outside. The fixed terminal plate 50 includes a contact piece 52 that extends downward along the movable contact 40 from one end where the fixed contact 51 is provided, and a fixed electromagnetic iron piece that faces the movable electromagnetic iron piece 47 at the lower end of the contact piece 52. 53 is fixed. A terminal screw 55 with a washer is screwed to the terminal piece 54 protruding outward from the case 10. The movable contact 40 and the fixed terminal plate 50 are housed in the case 10 two by two, and the main contact is constituted by two poles.

  In the case 10 where the movable contact 40 and the fixed terminal plate 50 are accommodated, a partition wall 18 is erected at a substantially central portion in the width direction of the case 10. A step portion 11 a with the cover 12 lowered is formed at a portion corresponding to the partition wall 18 on the lower wall of the body 11. The partition 18 is positioned by placing the provided horizontal piece 18 a on the lower wall of the body 11. Here, the lower wall of the part of the body 11 where the partition wall 18 is placed forms a step in the longitudinal direction of the body 11 (left and right direction in FIG. 2), and the horizontal piece 18a of the partition wall 18 follows this lower wall. By being bent in this manner, the partition wall 18 is positioned also in the longitudinal direction of the body 11. The partition wall 18 is also positioned by inserting a boss 11e protruding from the body 11 at a portion where the caulking pin 15 is inserted.

  Two terminal bases 11b and 11c on which one terminal plate 43 and the terminal piece 54 of the two poles are respectively mounted are provided on the surface of the body 11 facing the partition wall 18 to protrude from the cover 12 of the partition wall 18. Two terminal bases 18b and 18c on which the other terminal plate 43 and the terminal piece 54 of the two poles are respectively placed are projected. The terminal bases 11b and 18b and the terminal bases 11c and 18c are arranged in two upper and lower stages, and are different in height from the terminal plate 43 connected to the movable contact 41 and the terminal piece 54 connected to the fixed contact 51. It is arranged in this position. A partitioning piece 11d protrudes from the surface of the body 11 facing the partitioning wall 18, and a partitioning piece 18d protrudes toward the cover 12 at a portion corresponding to the partitioning piece 11d in the partitioning wall 18. Furthermore, a partitioning piece 11f with which a part of the partition wall 18 abuts is provided on the surface of the body 11 that faces the cover 12. The terminal plate 43 is fixed by the terminal bases 11b and 18b and the lower surfaces of the partition pieces 11d and 18d, and the terminal piece 54 is fixed by the terminal bases 11b and 18b and the terminal bases 11c and 18d. In addition, the partition piece 11 f reduces an adverse effect on the polarized electromagnet 20 due to an arc generated when the movable contact 41 and the fixed contact 51 are opened.

  By the way, in the relay, in order for the coil 25 to be a one-winding type and to move the plunger 27 forward and backward, it is necessary to reverse the energization direction to the coil 25. Therefore, as shown in FIG. 9, the coil 25 is connected to a switching contact for selectively selecting two types of feeding paths, and each feeding path selected by the switching contact is connected to a diode D for preventing a backflow. Is connected. The terminals on the opposite side of the switching contacts in the diode D are connected in common. The diode D is connected so that the currents passing through the respective power supply paths are opposite to each other. If the current in the direction of switching contact → coil 25 is passed through one power supply path, the other power supply is performed. In the path, a current in the direction of the coil 25 → the switching contact is passed.

  Since the energizing direction to the coil 25 is selected by the switching contact as described above, the switching contact is set so that the energizing direction is selected so that the forward / backward position of the plunger 27 is reversed when the coil 25 is energized. It is necessary to switch according to the advance / retreat of the plunger 27. That is, it is necessary to interlock the advance / retreat of the plunger 27 with the switching contact. Therefore, in the present embodiment, the contact operating piece 37 protrudes from the interlocking lever 31 and the switching operation of the switching contact is performed by the contact operating piece 37.

  The switching contact includes a contact board 61 placed on the upper surface of the polarized electromagnet 20, and the contact board 61 has two fixed contact plates 62a and 62b and movable contacts facing the fixed contact plates 62a and 62b, respectively. The plates 63a and 63b are fixed. The contact board 61 has a notch 61a at a peripheral portion, and a fixed claw 26b protruding upward from the outer peripheral surface of the coil frame 26 of the polarized electromagnet 20 is engaged with the notch 61a. Positioning with respect to 20 is made. Both the movable contact plates 63a and 63b are fixed to the leg pieces of the substantially U-shaped contact support plate 64 and electrically connected to each other, and each of the movable contact plates 63a and 63b corresponds to the corresponding fixed contact plate 62a, 63b. It has a spring force in a direction to contact 62b. The contact operating piece 37 of the interlocking lever 31 is inserted between the movable contact plates 63a and 63b. When the interlocking lever 31 swings as the plunger 27 advances and retreats, at the both end positions of the interlocking lever 31. One of the movable contact plates 63a and 63b is separated from the fixed contact plates 62a and 62b.

  The vertical height H (see FIGS. 3 and 4) of the contact operating piece 37 of the interlocking lever 31 inserted between the movable contact plates 63a and 63b is the vertical height H of the conventional contact operating piece 37 ′ of FIG. If it is lower than ', the time lag until switching can be reduced.

The fixed contact plates 62 a and 62 b and the movable contact plates 63 a and 63 b are electrically connected to a circuit board 65 made of a printed wiring board attached to the contact board 61. The circuit board 65 is mounted with the above-described diode D and a differential circuit for resetting. Further, a pair of coil terminal plates 66 are fixed to the contact board 61, and terminal screws 67 with washers are screwed into the coil terminal plates 66. Therefore, when an external signal input through the coil terminal plate 66 is received and the coil 25 is energized, the plunger 27 advances and retreats according to the energization direction. On the upper surface of the contact board 61, a partition piece 61b protrudes so as to partition the fixed contact plates 62a and 62b and the movable contact plates 63a and 63b from the circuit board 65 and to partition the coil terminal board 66 and other members. Established.

  Next, the operation will be described. First, assuming that the coil 25 is energized in the direction in which the plunger 27 protrudes, the interlocking lever 31 rotates around the shaft pin 33 in the clockwise direction in FIG. To touch. Here, since the movable contact 40 is in contact with the fulcrum protrusion 36A and is urged clockwise around the fulcrum protrusion 36A by the contact pressure spring 34, the contact pressure of the movable contact 41 against the fixed contact 51 is in contact. It is obtained by the pressure spring 34. At this time, as shown in FIG. 2, the movable contact plate 63 b is separated from the fixed contact plate 62 b, and only the direction in which the plunger 27 is retracted is permitted as the energization direction to the coil 25. Here, in a state where the movable contact 41 is in contact with the fixed contact 51, the state is maintained by the magnetic force of the permanent magnet 23 even when the energization of the coil 25 is stopped.

  In this case, the conventional semicircular fulcrum projection 36C is movable by urging the movable contact 40 with the contact pressure spring 34 'with the fulcrum projection 36C as a fulcrum as shown in FIG. 8A. Since the fulcrum position does not change when the contact 41 is brought into contact with the fixed contact 51, the spring load of the movable contact 41 only rises linearly and gently as shown in FIG. (About 600 g), chattering time is increased, and the life of the main contact (movable contact 41 and fixed contact 51) is shortened.

  On the other hand, in the case of the substantially trapezoidal fulcrum protrusion 36A as in the first embodiment, as shown in FIGS. 6 (a) and 6 (b), the movable contact 40 is used as a contact pressure spring with the fulcrum protrusion 36A as a fulcrum. When the movable contact 41 is urged at 34 (see arrow d) and the movable contact 41 is brought into contact with the fixed contact 51, as in FIG. From the vicinity of the flat surface-like second fulcrum b, the spring load of the movable contact 41 rises rapidly, and the spring load increases (about 1000 g).

  In this way, by setting a plurality of fulcrums a and b that change the fulcrum position of the movable contact 40 on the fulcrum protrusion 36A, the spring load of the movable contact 41 can be rapidly increased, so that the chattering time is reduced. The life of the main contact (movable contact 41 and fixed contact 51) is extended. Further, the structure is simple because only a plurality of fulcrums a and b are set on the fulcrum protrusion 36A of the interlocking lever 31.

  As a factor that the spring load of the movable contact 41 suddenly increases, the fulcrum protrusion 36A corresponds to a distance L1 (about 3 to 4 times the conventional fulcrum protrusion 36C) downward (from the movable contact 41 side) from the central axis C of the plunger 27. The distance between the fulcrums a and b and the movable contact 41 may be narrowed by extending the distance.

  Further, in the case of the substantially L-shaped fulcrum protrusion 36B as in the second embodiment, the movable contact 40 is moved by the contact pressure spring 34 with the fulcrum protrusion 36B as a fulcrum as shown in FIGS. When the movable contact 41 is brought into contact with the fixed contact 51 by energizing (see arrow d), as in FIG. From the vicinity of the second fulcrum c, the spring load of the movable contact 41 rises abruptly and the spring load increases (about 1000 g).

  In this way, by setting a plurality of fulcrums a and c that change the fulcrum position of the movable contact 40 on the fulcrum protrusion 36B, the spring load of the movable contact 41 can be increased rapidly, and chattering time is reduced. The life of the main contact (movable contact 41 and fixed contact 51) is extended. In addition, since the plurality of fulcrums a and c are only set on the fulcrum protrusion 36A of the interlocking lever 31, the structure is simple.

  As a factor that the spring load of the movable contact 41 suddenly increases, the fulcrum protrusion 36B corresponds to a distance L2 (about 4 to 5 times the conventional fulcrum protrusion 36C) downward from the central axis C of the plunger 27 (movable contact 41 side). The distance between each fulcrum a, c and the movable contact 41 may be narrowed by extending the distance.

  Particularly, in the case of the fulcrum protrusion 36B of the second embodiment, since the plurality of fulcrums a and c of the fulcrum protrusion 36B are curved, the spring load of the movable contact 40 is abrupt, but approximated to the attractive force of the plunger 27. Since it goes up like a curve, the contact operation of the movable contact 40 becomes smooth.

  Further, since the contact pressure spring 34 is a conical coil spring, the spring force of the movable contact 40 is increased as the conical coil spring becomes stronger as it expands compared to the normal coil spring 34 '(see FIG. 5). Will become more elevated. In the prior art structure of FIG. 5 as well, the spring load of the movable contact 40 can be increased by replacing the contact pressure spring 34 ′, which is a normal coil spring, with the contact pressure spring 34, which is a conical coil spring.

  When the energizing direction for energizing the coil 25 is reversed, the plunger 27 is retracted and the interlocking lever 31 rotates around the shaft pin 33 counterclockwise in FIG. The main contact is opened away.

It is a disassembled perspective view of a relay. It is the side view which fractured | ruptured partially in the state which removed the cover of the relay. It is an interlocking lever which has a fulcrum protrusion of a 1st embodiment, (a) is a front view, (b) is a side view, (c) is a perspective view. It is an interlocking lever which has a fulcrum protrusion of a 2nd embodiment, (a) is a front view, (b) is a side view, (c) is a perspective view. It is the side view which fractured | ruptured partially in the state which removed the cover of the relay of a prior art. It is a fulcrum protrusion of 1st Embodiment, (a) (b) is operation | movement explanatory drawing, (c) is a graph of the spring load of a movable contact. It is a fulcrum protrusion of 2nd Embodiment, (a) (b) is operation | movement explanatory drawing, (c) is a graph of the spring load of a movable contact. It is a fulcrum protrusion of a prior art, (a) is operation | movement explanatory drawing, (b) is a graph of the spring load of a movable contact. It is a circuit diagram.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Case 20 Polarized electromagnet 25 Coil 27 Plunger 31 Interlocking lever 33 Shaft pin 34 Contact pressure spring 36A, 36B Supporting protrusion 40 Movable contact 41 Movable contact 51 Fixed contact 62a, 62b Fixed contact plate 63a, 63b Movable contact plate a, b , C fulcrum

Claims (4)

A single-winding coil is provided, and a polarized electromagnet in which the plunger advances and retreats according to the energization direction of the coil, and is rotatably supported around a shaft pin provided at a fixed position, and is coupled to the plunger at a position different from the shaft pin. An interlocking lever that rotates around the shaft pin in accordance with the advancement and retraction of the plunger, a movable contact that is held by the interlocking lever and has a movable contact at one end, a fixed contact that is separated from the movable contact, and a power supply path to the coil A switching contact that is inserted into the coil and selects a power supply path to the coil from two power supply paths in conjunction with the advance and retreat of the plunger, and a reverse flow that regulates the directions of the currents passing through the power supply paths selected by the switching contact in opposite directions. A relay with a blocking element in the case,
The interlocking lever has a fulcrum projection that abuts on the movable contact, and a contact pressure spring for energizing the movable contact with the fulcrum projection as a fulcrum to obtain a spring load of the movable contact with respect to the fixed contact. A relay according to claim 1, wherein the fulcrum protrusion is provided with a plurality of fulcrum points that change the fulcrum position of the movable contact in a direction in which the spring load of the movable contact that contacts the fixed contact increases rapidly.   The relay according to claim 1, wherein a plurality of fulcrums of the fulcrum protrusion are formed in a curved shape. A single-winding coil is provided, and a polarized electromagnet in which the plunger advances and retreats according to the energization direction of the coil, and is rotatably supported around a shaft pin provided at a fixed position, and is coupled to the plunger at a position different from the shaft pin. An interlocking lever that rotates around the shaft pin in accordance with the advancement and retraction of the plunger, a movable contact that is held by the interlocking lever and has a movable contact at one end, a fixed contact that is separated from the movable contact, and a power supply path to the coil A switching contact that is inserted into the coil and selects a power supply path to the coil from two power supply paths in conjunction with the advance and retreat of the plunger, and a reverse flow that regulates the directions of the currents passing through the power supply paths selected by the switching contact in opposite directions. A relay with a blocking element in the case,
The interlocking lever has a fulcrum projection that abuts on the movable contact, and a contact pressure spring for energizing the movable contact with the fulcrum projection as a fulcrum to obtain a spring load of the movable contact with respect to the fixed contact. The relay according to claim 1, wherein the contact pressure spring is a conical coil spring. A single-winding coil is provided, and a polarized electromagnet in which the plunger advances and retreats according to the energization direction of the coil, and is rotatably supported around a shaft pin provided at a fixed position, and is coupled to the plunger at a position different from the shaft pin. An interlocking lever that rotates around the shaft pin in accordance with the advancement and retraction of the plunger, a movable contact that is held by the interlocking lever and has a movable contact at one end, a fixed contact that is separated from the movable contact, and a power supply path to the coil A switching contact that is inserted into the coil and selects a power supply path to the coil from two power supply paths in conjunction with the advance and retreat of the plunger, and a reverse flow that regulates the directions of the currents passing through the power supply paths selected by the switching contact in opposite directions. A relay with a blocking element in the case,
The interlocking lever has a fulcrum projection that abuts on the movable contact, and a contact pressure spring for energizing the movable contact with the fulcrum projection as a fulcrum to obtain a spring load of the movable contact with respect to the fixed contact. The fulcrum protrusion is provided with a plurality of fulcrum points for changing the fulcrum position of the movable contact in a direction in which the spring load of the movable contact in contact with the fixed contact is rapidly increased. A relay characterized by a conical coil spring.

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