TWI441223B - Electromagnetic relays and control devices with this electromagnetic relay - Google Patents

Description

Electromagnetic relay and control device having the same

The present invention relates to an electromagnetic relay and a control device using the same, and more particularly to an electromagnetic relay generally referred to as a safety relay.

In the above safety relay, the switch state is the opposite contact, that is, the NO (normally open (a)) contact and the NC (normally closed (b)) contact are shared by the electromagnet, the armature and the card. drive. In this safety relay, when one of the contacts is welded, the card does not move, so the other contact does not have a switching action. Thereby, it is possible to detect whether the contact is actually welded by the other contact. Therefore, such a safety relay has high safety, and can be used in combination with a plurality of sections in a control device for controlling a work machine or the like as a safety measure.

The safety relay described above is realized by four joints (for example, 3a1b, 2a2b, or 1a3b) shown in Patent Document 1 and Patent Document 2. The above safety relay is also realized by the configuration of six joints (for example, 5a1b or 3a3b) shown in Patent Document 3.

Fig. 26 is an exploded perspective view showing the electromagnetic relay of Patent Document 3; The electromagnetic relay 100 has a contact structure of 4a2b, that is, has a contacts 101-104 and b contacts 105,106. Among these contacts 101 to 106, the movable contacts 101a to 106a are driven together by the card 107.

On the card 107, locking holes 101b to 106b into which the leading ends of the movable contacts 101a to 106a are fitted are formed. The contacts 101, 102 located at the outermost side are fixed on the a contact. On the other hand, for the remaining contacts 103 to 106, a virtual locking hole is provided so that the a contact and the b contact can be arbitrarily selected.

When the card 107 is in the non-excited state of the electromagnet 108, the return spring 109 is displaced in the opposite direction to the arrow 110, the b contacts 105, 106 are opened, and the a contacts 101 to 104 are closed. On the other hand, when the electromagnet 108 is excited, the card 107 is displaced by the armature 111 in the direction of the arrow 110, the b contacts 105, 106 are closed, and the a contacts 101 to 104 are opened.

However, there are cases where there are not many contacts, and for example, as shown in Patent Document 4, an example of a two-contact is proposed.

[Patent Document 1] International Publication No. 06-006557

[Patent Document 2] JP-A-2000-285782

[Patent Document 3] JP-A-2006-196381

[Patent Document 4] Japanese Patent Publication No. 11-339624

Fig. 27 is a vertical sectional view showing the electromagnetic relay 120 of Patent Document 4, and Fig. 28 is a cross-sectional view showing the electromagnetic relay cut in a plane parallel to the horizontal direction. In Fig. 28, a concave corner is cut out in one part of the card 121 and illustrated. Figure 29 is a cross-sectional view taken along line XXIX-XXIX of Figure 27 and Figure 28.

As shown in Fig. 28, the electromagnetic relay 120 is considered to have a contact of 1a1b (a contact is denoted by reference numeral 123 and b contact is denoted by reference numeral 124). In this electromagnetic relay, the card 121 is slidably displaced toward the arrow 127 and its opposite direction by the armature 126 which is oscillated by the electromagnet 125. The one end side of the card 121 is only locked by the movable contacts 123a, 124a of the contacts 123, 124, and the other end portion of the card 121 has a simple structure for locking the armature 126, which can hook the armature 126 and the card stopped.

On the other hand, as shown in Fig. 26, in the electromagnetic relay 100, the locking claws 101c to 106c are formed at the tips of the movable contacts 101a to 106a, and the locking claws 101c to 106c are respectively locked to the locking holes 101b. The structure of the peripheral portion of ~106b.

In the electromagnetic relay 100 having a six-pole contact structure or a four-pole contact structure shown in Fig. 26, the card 107 to which the locking claws 101c to 106c are locked can be held in six of the locking claws 101c to 106c. Since the locking portions are present, it is difficult for the locking claws 101c to 106c to be detached from the card 107.

On the other hand, in the electromagnetic relay 120 shown in Figs. 27 to 29, when the minimum 1a1b contact structure is employed, the movable contacts 123a, 124a are along the width direction of the card 121 (as shown in Fig. 28). It is shown that the short side direction when the electromagnetic relay 120 is rectangular is arranged on an approximate straight line. Therefore, the card 121 is held only at the tip end of the movable contact points 123a, 124a arranged along the width direction, so that when the vibration of the collision or action in the direction 128 shown in Fig. 27 is applied to the electromagnetic relay 120, there is It is possible to unlock the locking of the armature 126 and the card 121.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic relay having high reliability and a control device using the electromagnetic relay, wherein the locked state between the card and the armature can be stably maintained even with a minimum contact structure.

The electromagnetic relay of the present invention comprises an electromagnet, an armature that generates a rocking displacement by the electromagnet, a card that is locked with the armature and that is slidably displaced by the armature of the armature, and the card card The movable contact, the fixed contact that can switch the contact state by contact or separation with the movable contact, and the return spring that is disposed between the armature and the movable contact and that locks the card. The movable contact and the fixed contact are respectively disposed on both sides of a center line of the card extending along the sliding direction of the card to form a combination, and a combination of one side of the center line is a normally open contact The combination on the other side of the above center line is a normally closed contact.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in the following description, the up-down direction is based on the 1st figure.

(first embodiment)

Fig. 1 is an exploded perspective view showing an electromagnetic relay 1 according to a first embodiment of the present invention. Fig. 2 is a perspective view showing the assembled state. Fig. 3 is a plan view of Fig. 2. The electromagnetic relay 1 is a safety relay having a minimum contact configuration, that is, a safety relay including a pair of a contacts 2 and b contacts 3. a Contact 2 is a normally open (NO) contact, and b contact 3 is a normally closed (NC) contact. For the sake of convenience, the arrangement direction of the contacts 2, 3 is regarded as the left and right direction.

As shown in FIGS. 1 to 3, the electromagnetic relay 1 includes a body (electromagnetic relay body) 4, an electromagnet block 5, an armature block 6, a return spring 7, a card 8, an upper cover 9, and contacts 2, 3.

The main body 4 is made of a molded article such as PBT (polybutylene terephthalate) having insulating properties and flame retardancy. The main body 4 includes a long-axis base 41 on which the electromagnet block 5 is mounted at one end, a pair of side walls 42 and 43 disposed at approximately the center of the base 41, and a portion of the side of the electromagnet block 5 that connects the side walls 42, 43 and is reinforced. The connecting member 44 of the side walls 42, 43 and the insulating partition 45 at the portion connecting the sides 2, 3 of the side walls 42, 43 extend from the central portion of the insulating partition 45 and the insulation of the junction 2 and the contact 3 The partition 46 and the other end of the base 41 hold the terminal block 47 of the contacts 2, 3.

The armature block 6 and the return spring 7 are housed in a region partitioned by the side walls 42, 43 and the insulating partition 45. Terminals 21, 22 of the contacts 2 and terminals 31, 32 of the contacts 3 are mounted on the terminal block 47. The card 8 is slidable on the insulating partition 45.

Figures 4(a) and 4(b) are vertical cross-sectional views of the electromagnetic relay 1. Further, in Fig. 4, the illustration of the upper cover 9 is omitted. According to this Fig. 4, the configuration of the electromagnet block 5 and the armature block 6 can be understood. As shown in Fig. 4, the electromagnet block 5 includes a coil 51, a bobbin 52 that winds up the coil 51, a core 53 that is inserted into the center hole of the bobbin 52, and has a slightly L-shaped yoke 54, 55 and is disposed on A pair of coil terminals 56 of the flange portion 52a on the lower side of the bobbin 52. Each end of the coil 51 is connected to the upper side of each coil terminal 56. The lower portion of each coil terminal 56 is press-fitted to the base 41, and protrudes to the outside as a terminal.

The armature block 6 is not entirely formed of soft iron or the like, and includes a daughter card 61 of a plastic molded article, a movable plate 62 made of soft iron or the like, and a rectangular parallelepiped permanent magnet 63 for weight reduction. The movable plate 62 is formed in a rectangular flat plate shape and connected to the sub-card 61. The permanent magnet 63 is fixed to the surface of the movable plate 62. As shown in FIGS. 1 and 2, a pair of latches 64 are provided on the left and right side faces of the daughter card 61. The pair of pins 64 are respectively inserted into the holes 48 formed in the side walls 42, 43 of the base 41, whereby the armature block 6 can be freely rocked and displaced toward the arrow 69 and its opposite direction. When the armature block is mounted on the base 41, the upper end portion of the movable plate 62 faces the yoke 54 on the upper side of the electromagnet block 5, and the lower end portion faces the yoke 55 on the lower side of the electromagnet block 5. A tongue 65 is extended from the upper end of the daughter card 61. The tongue 65 is locked to the locking hole 81 formed in the card 8, whereby the displacement drive can be caused toward the arrow 82 of the card 8 and its opposite direction.

The return spring 7 is formed into a slightly Y-shape as shown in Fig. 1 by press working and bending of a thin elastic metal plate. The lower end portion 71 of the return spring 7 is increased in rigidity by folding (coinciding) the above-mentioned metal plate. As shown in FIG. 4, the lower end portion 71 presses the base 41 between the armature block 6 and the insulating partition 45. The leading end portions 75, 76 of the upper ends 73, 74 are inserted into the return spring holes 83, 84 of the card 8. Thereby, the card 8 is biased in the opposite direction of the arrow 82. At the lower end portion 71, locking projections 71a, 71b from the base 41 are formed.

The contacts 2, 3 include fixed contact terminals 21, 31 and movable contact terminals 22, 32. These terminals 21, 22 and the terminals 31, 32 are formed by punching a thin elastic metal plate and bending the side surface of the crank shape. Within the curved portions 21a, 22a and the curved portions 31a, 32a, in order to make the curved portions 22a, 32a of the movable contact terminals 22, 32 more rigid, the metal plate is folded into two layers. At the other end of the base 41, the bending portions 21a, 22a and the curved portions 31a, 32a are pressed into the mounting grooves 49 formed at both side portions, and then fixed with an adhesive. Thereby, the rotation of the terminals 21, 22 and the terminals 31, 32 in the direction of the arrow 85 and the opposite direction is suppressed, and the states are arranged so as to be parallel to each other. The terminals 21, 22 and the lower end portions 21b, 22b and the lower end portions 31b, 32b of the terminals 31, 32 protrude from the base 41, thereby functioning as relay terminals. In the vicinity of the elastic upper arm portions 21c, 22c and the upper end portions of the upper arm portions 31c, 32c, the contact members 21d, 22d and the contact members 31d, 32d are die-cast and fixed.

The fixed contact terminals 21, 31 have ribs 21e, 31e formed in the lower portion of the contact elements 21d, 31d in order to impart rigidity to the upper arm portions 21c, 31c. The movable contact terminals 22, 32 are pressed, and the base end portion on the side of the base 41 is flexed, whereby the contact members 21d, 22d and the contact members 31d, 32d are brought into contact in an approximately parallel state. On the other hand, the movable contact terminals 22, 32 have slits 22e, 32e which are formed on the side of the base 41 in order to easily bend the upper arm portions 22c, 32c. The slits 22e, 32e may not be additionally provided. Between the terminal 21 and the terminal 22 and between the terminal 31 and the terminal 32, an insulating partition wall 40 for insulating each other is provided from the base 41. The insulating partition 40 separates (separates) the contact elements 21d, 22d and the contact elements 31d, 32d which are in contact with each other in the accommodation space of the contacts 2, 3 which are partitioned by the insulating partition 46. Further, the insulating partition wall 40 is provided to ensure that the contact gap is 0.5 mm or more during the dissolution. Further, the insulating partition 40 is provided to prevent a short circuit when the return spring 7 is bent.

When the coil 51 is in the non-energized state, the card 8 is biased toward the side of the electromagnet block 5 by the elastic force of the return spring 7, that is, in the opposite direction to the arrow 82. The card 8 is slidably displaced in the direction of the arrow 82 by the energization of the coil 51. The fixed contact terminal 21 and the movable contact terminal 32 are disposed on a straight line perpendicular to the sliding direction of the card 8. Further, the movable contact terminal 22 and the fixed contact terminal 31 are disposed on a straight line perpendicular to the sliding direction of the card 8. On the side of the center line 8x b (NC) contact 3, the fixed contact terminal 31 is disposed inside (in the opposite direction to the arrow 82), and the movable contact terminal 32 is disposed outside (in the direction of the arrow 82). On the side of the a (NO) contact 2 of the center line 8x, the movable contact terminal 22 is disposed inside, and the fixed contact terminal 21 is disposed outside. At the leading end portions of the arm portions 22c, 32c on the movable contact terminals 22, 32, tabs 22f, 32f that are locked to the locking holes 86, 87 of the card 8 are provided.

As shown in Fig. 3, the tongue piece 22f and the tongue piece 32f are respectively provided with a projection (a locking claw) 22g and a projection (a locking claw) 32g which are formed by bending the tip end. Protrusions 86a, 86b, 86c and projections 87a, 87b, 87c are formed in the locking hole 86 and the locking hole 87, respectively. The projections 86a, 86b, 86c and the projections 87a, 87b, 87c sandwich the tab-shaped tongue piece 22f and the tongue piece 32f, and the locking projections (the locking claws) 22g and the projections (the locking claws) 32g. Thereby, the tongue piece 22f and the tongue piece 32f are locked by the locking hole 86 and the locking hole 87.

The card 8 is slightly U-shaped when viewed in the plane direction. The locking hole 81 and the pair of left and right return spring holes 83, 84 that are locked to the above-described daughter card 61 are formed in the U-shaped connecting portion 80. The pair of right and left locking holes 86, 87 are formed on the side of the U-shaped arm portions 88, 89. This card 8 is supported by the tongue 65 of the daughter card 61, the leading end portions 75, 76 of the return spring 7, and the tongues 22f, 32f of the movable contact terminals 22, 32. The height of the upper end surface 45a of the insulating partition 45 is set so as not to be in contact with the back surface of the base end side of the arm portions 88, 89. The height of the step surface 46a formed on the upper end side of the insulating partition 46 is set so as not to come into contact with the lower end faces 88b, 89b of the lowering pieces 88a, 89a formed from the inner facing faces 88c, 89c of the arm portions 88, 89.

The card 8 is guided by the following two-point configuration to produce a sliding displacement. First, between the hanging pieces 88a, 89a, the upper end portion 46b of the insulating partition 46 is sandwiched, and between the inner facing faces 88c, 89c of the arms 88, 89, the top plate 91 of the upper cover 9 is clamped. The guide rail 91a is formed. Next, the lower end faces 91b of the guide rails 91a are fitted to the segments 88d and 89d formed by the lowering pieces 88a and 89a on the inner facing faces 88c and 89c of the arms 88 and 89.

The upper cover 9 is composed of a resin molded article such as a transparent polycarbonate to determine the switching states of the contact members 21d, 22d and the contact members 31d, 32d. The upper cover 9 is formed in a box shape in which the bottom surface is open. The upper cover 9 is placed on the main body 4 shown in Fig. 2 from above in a state in which the components are assembled, and the inner peripheral surface of the lower end of the upper cover 9 is connected to the base 41.

In the electromagnetic relay 1 configured as described above, in the non-energized state of the coil 51, as shown in Figs. 2, 3, and 4(a), the armature block 6 is biased by the return spring 7, It is biased toward the arrow 69 by the card 8. Thereby, the card 8 is oriented in the opposite direction to the arrow 82, that is, toward the side of the electromagnet block 5, causing a sliding displacement. The movable contact terminals 22, 32 latched to the card 8 also face in a direction opposite to the arrow 82, that is, toward the side of the electromagnet block 5, causing a bending deformation. Thereby, the b (NC) contact 3 is turned on, and the a (NO) contact 2 is blocked.

On the other hand, in the energized state of the coil 51, as shown in Fig. 4(b), the armature block 6 is pressed against the elastic force of the return spring 7 of the card 8, and is swung in a direction opposite to the direction of the arrow 69. Thereby, the card 8 is oriented in the direction of the arrow 82, that is, on the side opposite to the electromagnet block 5, causing a sliding displacement, and the movable contact terminals 22, 32 locked to the card 8 are also oriented in the direction of the arrow 82, that is, On the side opposite to the electromagnet block 5, bending deformation occurs. Thereby, the b (NC) contact 3 is blocked, and the a (NO) contact 2 is turned on.

In the electromagnetic relay 1 of the first embodiment, the projections 75a, 76a are formed on the tip end portions 75, 76 of the return spring 7, respectively. On the return spring holes 83, 84, projections 83a, 83b, 83c and projections 84a, 84b, 84c which are engaged with the thickness direction are formed with respect to the leading end portions 75, 76. Thus, one of the locking holes includes a return spring hole 83 and protrusions 83a, 83b, 83c, and the other locking hole includes a return spring hole 84 and protrusions 84a, 84b, 84c.

Fig. 5(a) is a perspective view showing the tip end portion 76 of the return spring 7, and Fig. 5(b) is a plan view showing the vicinity of the tip end portion 76 of the magnifying return spring 7 and the return spring hole 84 of the card 8 stuck thereto. . Further, in the fifth (a) and fifth (b) drawings, the vicinity of the tip end portion 76 and the return spring hole 84 is illustrated, but the other end portion 75 and the return spring hole 83 have the same structure.

The return spring 7 is formed by press working and bending a thin elastic metal plate. By the sheet metal processing, projections 75a, 76a are formed at the leading end portions 75, 76, respectively.

This electromagnetic relay 1 can be used as a safety relay or the like. In the electromagnetic relay 1, a pair of a contacts 2 and b contacts 3 are arranged on both sides of the center line 8x of the card 8. Even in such a minimum configuration, the electromagnetic relay 1 has the return spring 7 between the armature 6 and the movable contacts 22, 32, so that the projections 75a and the projections 76a, the projections 83a, 83b, 83c and the projections 84a, 84b , 84c are respectively locked on it. Thereby, the card 8 can be locked by the return spring 7, and the locked state between the card 8 and the armature 6 can be stably maintained.

Then, by the tongues 22f, 32f of the upper arm portions 22c, 32c of the movable contact terminals 22, 32, one end side of the card 8 is locked, and the other end side of the card 8 is by the tip end portion 75 of the return spring 7, 76 was stuck. Thereby, even if the collision in the direction 68 shown in FIG. 4 or the vibration during the operation is applied to the electromagnetic relay 1, the locking between the armature 6 and the card 8 can be suppressed from being released, so that the reliability can be improved. Sex. Further, since the projections 75a, 76a of the leading end portions 75, 76 of the return spring 7 are formed by sheet metal working, the unblocking prevention structure of the card 8 can be realized with a simple structure.

Further, as shown in Figs. 6(a) and 6(b), a plurality of protrusions (protrusions 76b, 76c in Fig. 6) may be provided in one of the leading end portions 76. A plurality of protrusions may be provided at the other tip end portion 75. By the return spring 7a, the projections 76b, 76c formed in the tip end portion 76 are respectively locked to the projections 84b, 84c formed on the side faces of the locking holes 84.

(Second embodiment)

Fig. 7(a) is a perspective view showing the tip end portion 76 of the return spring 7b in the electromagnetic relay 1 according to the second embodiment of the present invention, and Fig. 7(b) is a perspective view showing the tip end portion 76 of the return spring 7c. As shown in Figs. 7(a) and 7(b), these return springs 7b, 7c are similar to the return springs 7, 7a in the first embodiment. Therefore, the same reference numerals will be given to the corresponding parts, and the description will be omitted.

In the return springs 7b, 7c, two slits 77 in the vertical direction are formed in the vicinity of the projections 76a and the projections 76b. With these slits 77, the tip end portion 76 is divided into three portions (divided portions). In the return spring 7b shown in Fig. 7(a), a projection 76a is formed at a divided portion in the middle. In the return spring 7c shown in Fig. 7(b), projections 76b and projections 76c are formed in the two divided portions on both sides.

By these return springs 7b, 7c, the spring characteristics of the tip end portion 76 are easily deformed. Therefore, when the tip end portion 76 is inserted into the locking holes 83, 84 of the card 8, the spring characteristics of the return springs 7b, 7c are moderately deformed. The effect of suppressing the card from being cut is improved, and the generation of the powder can be further suppressed.

(third embodiment)

Fig. 8(a) is a perspective view showing the tip end portion 76 of the return spring 7d in the electromagnetic relay 1 according to the third embodiment of the present invention, and Fig. 8(b) is a perspective view showing the tip end portion 76 of the return spring 7e. As shown in Figs. 8(a) and 8(b), these return springs 7d, 7e are similar to the return springs 7b, 7c of the second embodiment. Therefore, the same reference numerals will be given to the corresponding parts, and the description will be omitted.

In the return springs 7d, 7e, the tip end portion 76 is divided into three portions (divided portions) by two slits 77 in the vertical direction. In the return spring 7d shown in Fig. 8(a), a projection 76d is formed at a divided portion in the middle. In the return spring 7e shown in Fig. 8(b), projections 76e and projections 76e are formed in the two divided portions on both sides.

The projection 76d has a semi-cylindrical shape. The axial direction of the projection 76d is perpendicular to the direction 78 in which the card 8 is inserted into the locking hole, and is directed in a direction parallel to the return spring 7d (the flat portion below the leading end portion 76 of the return spring 7d). This projection 76d protrudes in a direction almost perpendicular to the above-described flat plate portion of the return spring 7d.

Similarly, each of the projections 76e has a semi-cylindrical shape. The axial direction of each of the projections 76e is perpendicular to the direction 78 in which the card 8 is inserted into the locking hole, and is directed in a direction parallel to the flat plate direction of the return spring 7d. Each of the projections 76e protrudes in a direction substantially perpendicular to the flat plate portion of the return spring 7d.

Thus, the projections 76d, 76e have a semi-cylindrical shape because they are in surface contact or linear contact with the projection 84a and the projections 84b, 84c formed on the inner surface (inner circumferential surface) of the return spring holes 83, 84, so that suppression can be obtained. The card 8 is subjected to the effect of cutting. Further, the projections 76d, 76e can be easily formed by the bending process of the tip end portion 76, and the shape is stabilized.

Further, since each of the projections 76d and 76e has an arc shape in cross section and has a curved surface that protrudes in a direction substantially perpendicular to the flat plate portion, it can be used as a rib for reinforcing the divided portion of the tip end portion 76.

Further, the protrusions 76d and the protrusions 76e may adopt a semi-cylindrical shape or the like instead of the semi-cylindrical shape. The term "semi-cylindrical shape" as used herein refers to a semi-cylindrical shape in which the semi-cylindrical projection 76d and the projection 76e shown in Figs. 8(a) and 8(b) are filled with metal. When such a semi-cylindrical shape is employed, the effect of the rib for reinforcing the divided portion of the tip end portion 76 is improved as compared with the semi-cylindrical shape.

(fourth embodiment)

Fig. 9(a) is a perspective view showing the tip end portion 76 of the return spring 7f in the electromagnetic relay 1 according to the fourth embodiment of the present invention, and Fig. 9(b) is a perspective view showing the tip end portion 76 of the return spring 7g. Fig. 10 is a cross-sectional view showing the vicinity of the return spring hole 84 of the card 8 on which the tip end portion of the return spring 7f is locked. These return springs 7f, 7g are similar to the return springs 7d, 7e as shown in Figs. 9(a) and 9(b). Therefore, the same reference numerals will be given to the corresponding parts, and the description will be omitted.

The return springs 7f and 7g are formed into a shape in which the tip end portion 76 is divided into three by sheet metal working. In other words, in the return springs 7f, 7g, two slits 77 extending in the vertical direction are formed on the tip end portion 76. The plurality of divided portions in the respective leading end portions 76 are arranged in a zigzag shape as viewed in plan.

As shown in Fig. 9(a), in the return spring 7f, the plurality of divided portions include two divided portions composed of the straight portion 76h and divided portions having the step 76j formed by the bending process, and these portions are alternately arranged. The two divided portions composed of the straight portion 76h are in the same plane as the lower portion of the leading end portion 76 in the return spring 7f, and on one of the planes, the projection 76f having the divided portion of the step 76j protrudes. Each of the divided portions is locked to the locking hole. In this return spring 7f, the upper portion of the step 76j acts as the projection 76f. When the return spring 7f is viewed from the plane, the two divided portions composed of the straight portions 76h are arranged side by side in the same column. Further, in this embodiment, each divided portion is locked to the locking hole, but the present invention is not limited thereto. At least one of the plurality of divided portions may be locked to the locking hole.

As shown in Fig. 9(b), in the return spring 7g, the plurality of divided portions include a divided portion composed of the straight portion 76i and two divided portions having a step 76k formed by bending processing, and these portions are alternately arranged. The divided portion composed of the straight portion 76i is in the same plane as the lower portion of the leading end portion 76 in the return spring 7g, and on one of the planes, the projection 76g having the divided portion of the step 76k protrudes. Each of the divided portions is locked to the locking hole. In this return spring 7g, the upper portion of the step 76k acts as the projection 76g. When the return spring 7g is viewed from the plane, the two divided portions having the step difference 76k are arranged side by side in the same column. Further, in this embodiment, each divided portion is locked to the locking hole, but the present invention is not limited thereto. At least one of the plurality of divided portions may be locked to the locking hole.

The configuration is such that a divided portion composed of straight portions 76h, 76i is disposed in one of the columns, and a divided portion having the step 76j, 76k is disposed in the other column. With such a simple configuration, it is possible to suppress the effect of the card 8 being unwound from the locking hole.

Further, the step 76j, 76k is processed in a direction opposite to the stripping direction 79 of the mold away from the mold during the bending process. In other words, the projections 76f, 76g protrude in a direction opposite to the demolding direction 79 on the plane including the return springs 7f, 7g at the lower portion of the tip end portion 76.

Thus, the step 76j, 76k is formed in a direction opposite to the mold releasing direction 79 of the mold, whereby the burr 761 produced by the sheet metal processing is formed along the mold releasing direction 79 of the mold as shown in Fig. 10. As described above, the projections 76f, 76g protrude from the divided portions composed of the straight portions 76h, 76i to the opposite direction to the demolding direction 79, so that the burrs 761 are easily accommodated to the divided portions composed of the straight portions 76h, 76i and There is a space between the divided portions of the step 76j, 76k. Therefore, when the leading end portion 76 is inserted into the locking hole of the card 8, the burr 761 can be prevented from coming into contact with the side surface of the locking hole. Thereby, the card 8 can be suppressed from being cut, so that generation of powder can be suppressed.

By using such an electromagnetic relay 1 for a control device for controlling a work machine, a production line, or the like, miniaturization and high reliability can be obtained.

[Summary of implementation type]

By summarizing the above embodiments, the following summary can be obtained.

(1) The electromagnetic relay of the above-described embodiment includes an electromagnet, an armature that generates a wobble displacement by the electromagnet, a card that is locked with the armature and that is slidably displaced by the armature of the armature. a movable contact that is locked with the card, a fixed contact that can switch the contact state by contact or separation with the movable contact, and a gap between the armature and the movable contact and the card is locked Return spring. The movable contact and the fixed contact are respectively disposed on both sides of a center line of the card extending along the sliding direction of the card to form a combination. The combination of one of the center lines is a normally open contact, and the combination of the other side of the center line is a normally closed contact.

In this aspect, a return spring disposed between the armature and the movable contact and locking the card is included. Therefore, when a vibration during a collision or an action is applied thereto, the card is locked by the return spring even if the minimum contact structure in which the locking between the armature and the card is easily released is used. Thereby, the locked state between the card and the armature can be stably maintained. In other words, the card can be inhibited from being detached from the armature. Thereby, the reliability of the electromagnetic relay can be improved.

(2) The return spring may have a projection formed by sheet metal processing at the tip end portion thereof, and the card may have a locking hole inserted into a tip end portion of the return spring, and the protrusion may be configured to be locked to the locking hole.

In this type, the projection can be easily formed by sheet metal processing, and the projection of the simple structure obtained in this manner can be locked to the locking hole of the card, whereby the card can be locked by the elastic return spring.

(3) The return spring may have a slit in the vicinity of the protrusion.

In this type, since the slit is provided in the vicinity of the projection, the spring characteristic which is easily deformed is added to the vicinity of the projection. Thereby, when the return spring is inserted into the locking hole of the card, moderate deformation is caused by the spring characteristic of the return spring, and the effect of suppressing the cutting of the card is improved, and the generation of the powder can be further suppressed.

(4) The protrusion may have a semi-cylindrical shape, and the surface thereof may be in direct or surface contact with the locking hole.

In this type, the projection has a semi-cylindrical shape, and the surface thereof is in direct contact or surface contact with the locking hole, so that the effect of suppressing the cutting of the card can be obtained. Further, the projection of the semi-cylindrical shape can be easily formed by bending the tip end portion. Moreover, since the forming is easy, the shape (quality) is stable. Further, the above protrusions may have a semi-cylindrical shape.

(5) The structure may be such that the return spring is divided into a plurality of shapes by the sheet metal forming, and the plurality of divided portions in the leading end portion are arranged in a zigzag shape, and the card has the insertion return spring The locking hole of the tip end portion, at least one of the plurality of divided portions is locked to the locking hole.

In this type, a plurality of divided portions arranged in a zigzag shape can be easily formed by sheet metal forming. At least one of the plurality of divided portions obtained in this manner and having a simple structure is locked to the locking hole of the card, whereby the card can be locked by the return spring.

(6) The plurality of divided portions include a linear divided portion and a divided portion having a step formed by bending, and the portions are alternately arranged, and the step is preferably opposite to a direction of release from the mold during the bending process. The direction is bent.

In this form, by forming a step in a direction opposite to the direction in which the mold is released from the mold, the burrs generated by the sheet metal processing are formed along the mold releasing direction of the mold. Since the projection protrudes from the linear divided portion in a direction opposite to the demolding direction, the burr is easily accommodated in a space between the linear divided portion and the divided portion having the step. Therefore, when the return spring is inserted into the locking hole of the card, the burr can be prevented from coming into contact with the side surface of the locking hole. Thereby, the card can be suppressed from being cut, so that generation of powder can be suppressed.

(7) The control device of the above embodiment includes the above electromagnetic relay.

By this type, high reliability can be obtained even if a small electromagnetic relay is used in a control device for controlling a work machine, a production line, or the like.

In addition, the present invention is not limited to the above-described embodiments, and various modifications, improvements, and the like can be made without departing from the spirit and scope of the invention.

<First Reference Example>

As shown in Fig. 26, in the electromagnetic relay 100 having a six-pole contact structure or a four-pole contact structure, the card 107 to which the locking claws 101c to 106c are locked is held by the locking claws 101c to 106c. Since the six locking portions are present, it is difficult for the locking claws 101c to 106c to be detached from the card 107.

On the other hand, as shown in Figs. 27 to 29, when the configuration of the fewer contacts is adopted, the movable contacts 123a, 124a are along the width direction of the card 121 (as shown in Fig. 28, when the electromagnetic relay 120 The short side direction of the rectangle is arranged on an approximate straight line. Therefore, the card 121 is held only at the tip end of the movable contact points 123a, 124a arranged along the width direction, so that when the vibration of the collision or action in the direction 128 shown in Fig. 27 is applied to the electromagnetic relay 120, there is It is possible to unlock the locking of the armature 126 and the card 121.

Therefore, in the first reference example, an object of the present invention is to provide an electromagnetic relay having high reliability and a control device using the same, wherein the card between the card and the armature can be stably maintained even with a configuration of a small number of contacts Stop state.

In the following, the first reference example will be described, and the same reference numerals will be given to the same components as those in the first embodiment, and the description thereof will be omitted. In addition, the overall structure of the electromagnetic relay 1 of the first reference example is almost the same as that of the above-described first embodiment, and therefore the description thereof will be omitted. Only the features of the first reference example will be described in detail below.

In the electromagnetic relay 1 of the first reference example, the card 8 is guided by the following three-point structure to cause sliding displacement. First, the upper end portion 46b of the insulating partition 46 is sandwiched between the hanging pieces 88a, 89a, and the guide rails which are suspended from the top plate 91 of the upper cover 9 are sandwiched between the inner facing faces 88c, 89c of the arms 88, 89. 91a. Next, the lower end faces 91b of the guide rails 91a are fitted to the segments 88d and 89d formed by the inner facing faces 88c and 89c of the arms 88 and 89, which are formed by the hanging pieces 88a and 89a. Further, both side portions of the joint portion 80 are guided on the inner wall surfaces of the side walls 42, 43.

As shown in Figs. 11 to 13, in the electromagnetic relay 1, the card 8 has projections 80a, 80a which extend from the side portions on both sides of the center line 8x of the card 8 toward the side walls 42, 43 respectively. Each of the projections 80a is provided at an end of the card 8 in the opposite direction of the arrow 82.

As shown in Figs. 11 and 12, guide grooves 42a, 43a are formed on the side walls 42, 43 respectively, which extend toward the sliding direction of the card 8 and are respectively fitted by the projections 80a, 80a.

Fig. 15 is a side view showing the body 4 of the first reference example. Fig. 16(a) is a plan view showing the card of the first reference example, and Fig. 16(b) is a side view thereof, as shown in Figs. 16(a) and 16(b), each of the projections 80a is in the cylinder. The tip end of the shaft portion 80a1 has a shape as a hemisphere 80a2 for guiding. Each of the projections 80a presses the card 8 between the side walls 42, 43 in a state where the side walls 42, 43 are slightly separated in the direction in which they are separated from each other, whereby the projections 80a are fitted into the guide grooves 42a, 43a. At this time, the tongue piece 65 that is displaced in the direction opposite to the arrow 82 is positioned at the position of the locking hole 81 along the sliding direction, and the leading end portions 75, 76 of the return spring 7 are positioned at the return spring hole 83. 84 position. On the one hand, the card 8 deforms the return spring 7 and is pressed between the two side walls 42, 43 on the one hand. Thereby, the armature 6 and the return spring 7 can be locked to the card 8. Thereafter, the tongues 22f, 32f of the movable contact terminals 22, 32 are positioned at the positions of the locking holes 86, 87, and pressed into the locking holes 86, 87, thereby making the movable contact terminals 22, 32 It is locked to card 8. The above completed the installation of the card 8.

Figures 17(a) and 17(b) show the operation of the card 8. The 17th (a) diagram is the same as the 14th (a) diagram, and shows the position of the card 8 in the non-energized state. Fig. 17(b) is the same as Fig. 14(b) and shows the position of the card 8 in the energized state.

As shown in Figs. 17(a) and 17(b), when the card 8 slides in the sliding direction, the projections 80a, 80a move in the guide grooves 42a, 43a. The end portion of the card 8 on the side of the arrow 82 is locked by the movable contact terminals 22, 32, and the end portion of the card 8 opposite to the arrow 82 is fitted to the guide grooves 42a, 43a. The projections 80a, 80a are locked. Thereby, even if a configuration of a small number of contacts is employed, the locked state between the card 8 and the armature 6 can be stably maintained.

By using such an electromagnetic relay 1 for a control device for controlling a work machine, a production line, or the like, a control device having high reliability when subjected to a collision or the like can be realized.

(Other types of the first reference example)

Fig. 18(a) and Fig. 18(b) are side views showing the other main bodies 4', 4" of the first reference example, and Fig. 19(a) is a view showing another type of the first reference example. The plan view of the card 8', the 19th (b) is a view of the vicinity of the protrusion of the enlarged card 8', and the 19th (c) is a side view of the card 8'. The body 4', 4" and the body 4 described above The same reference numerals are attached to the corresponding parts, and the description thereof is omitted.

As shown in Fig. 18(a), in the body 4', the guide grooves 42a, 43a formed in the side walls 42', 43' are on one side of the sliding direction of the card 8 (the side opposite to the arrow 82). The protrusion 80a is extended beyond the sliding range when the card 8 is normally used. In the extended end portion beyond the sliding range, the introduction grooves 42b, 43b are formed at the upper end portions of the side walls 42, 43 to form notches. Since the introduction grooves 42b and 43b communicate with the guide grooves 42a and 43a, the projections 80a and 80a of the card 8 are introduced into the guide grooves 42a and 43a through the introduction grooves 42b and 43b, respectively.

As shown in Fig. 18(b), in the main body 4", the guide grooves 42a, 43a formed in the side walls 42", 43" are on the other side of the sliding direction of the card 8 (the side in the direction of the arrow 82), exceeding The projection 80a is extended in the sliding range when the card 8 is normally used. The extension grooves 42b and 43b which are the same as the above are provided on the extended end portion beyond the sliding range.

With such a simple structure, the projections 80a can be easily introduced through the guide grooves 42a, 43a. Moreover, when the card 8 is embedded in the side walls 42', 43' (or the side walls 42", 43"), it is not necessary to deform the side walls 42', 43' (or the side walls 42", 43") to expand to the outside, so It is possible to suppress the projections 80a from being cut, and it is possible to suppress breakage of the bodies 4', 4" and the card 8.

Further, in the main body 4' of Fig. 18(a), the introduction grooves 42b, 43b are provided on the opposite side of the direction of the arrow 82, that is, at the displacement position of the card 8 in the non-excited state of the electromagnet block 5. The end of the guide groove 42a, 43a on the side. On the other hand, in the main body 4" shown in Fig. 18(b), the introduction grooves 42b, 43b are provided on the side of the direction of the arrow 82, that is, the change of the card 8 in the exciting state of the electromagnet block 5 The end of the guide groove 42a, 43a on the side of the position (pressing position).

Thus, the introduction grooves 42b, 43b may be formed at the end of either side of the sliding direction of the card 8, but as shown in the body 4" of Fig. 18(b), if the card is formed in the electromagnet block 5 When the end portion on the side of the displacement position in the excitation state is in the non-excited state, the projection 80a is disposed at the end portion where the guide grooves 42a and 43a are closed (the end portions of the introduction grooves 42b and 43b are not provided), so Even if some collision is applied to the electromagnetic relay 1, it is possible to suppress the protrusions 80a of the card 8 from being pushed out by the introduction grooves 42b and 43b due to the collision, and the impact resistance can be further improved. Further, as shown in Fig. 18(a) and As shown in Fig. 18(b), when the introduction grooves 42b and 43b are provided, when the projections 80a are fitted into the guide grooves 42a and 43a, the stress applied to the card 8 and the stress applied to the projections 80a become small.

Fig. 19(a) is a plan view showing a card 8' of another type of the first reference example, Fig. 19(b) is a view showing the vicinity of the protrusion of the enlarged card 8', and Fig. 19(c) is a card 8' Side view.

As shown in Fig. 19(a), each of the projections 80b of the card 8' has a pin shape in which a portion having two outer diameters is connected to the axial direction. Each of the projections 80b includes a large diameter portion 80b2 and a small diameter portion 80b1. The large diameter portion 80b2 protrudes from the side surface of the card 8' to the side of the guide grooves 42a, 43a, respectively. The small diameter portion 80b1 protrudes from the large diameter portion 80b2 to the side of the guide grooves 42a, 43a, respectively.

As shown in Fig. 19(b), the small diameter portion 80b1 of the tip end portion is fitted into the guide grooves 42a, 43a. The large diameter portion 80b2 on the proximal end side is located between the side walls 42, 43 and the side of the card 8'. The stepped surface 80b3 of the small diameter portion 80b1 and the large diameter portion 80b2 is located at the peripheral edge portion of the guide grooves 42a and 43a, and the peripheral portion is slid. Thus, in the gap between the card 8' and the side walls 42', 43' (or the side walls 42", 43") of the body 4', 4", there is a large diameter portion 80b2 of the protrusion 80b, so that the card can be The tolerance of 8' becomes small, whereby the stable sliding action of the card 8' can be achieved.

Providing such a step surface 80b3 has an effect on the electromagnetic relay 1 shown in Fig. 11. The electromagnetic relay 1 is used as a safety relay or the like, and is normally open and normally closed in mutually opposite contact states, that is, a contact 2 and b contact 3 are arranged in a one-to-one manner on the card 8' On both sides of the center line 8. In this electromagnetic relay 1, the state of the contacts differs on one side and the other side of the center line 8x. The movable contact terminal of the card 8' is provided with the elastic force of the movable contact terminals 22, 32 on both sides, and is transmitted through the contact side of the closed state (the side of the b contact 3 in the non-excited state) 32. The elastic force generated by the fixed contact terminal 31 is applied. Therefore, the difference in the elastic force causes the card 8' to generate the off-axis rotation shown by the arrow 85 (Fig. 13), and the amount of the over-travel (press-in) of the movable contact terminal 32 is lost, and the contact operation is sometimes stabilized. Sexual decline.

Thus, the projections 80b of the above-described two-stage configuration suppress the tolerance of the card 8', whereby the rotation of the card 8' can be suppressed. Further, when the minimum contact structure such as 1a1b is employed, the card 8' is shortened and is easily rotated, so that it is particularly effective. Further, as shown in FIG. 13, when the a contact 2 and the b contact 3 are arranged in a direction substantially perpendicular to the axis 8x, the protrusion 80b of the two-stage configuration can be disposed at the side of the b-contact 3, which The position may cause the side surface of the joint portion 80 to come into contact with the side walls 42', 42" due to the rotation in the direction indicated by the arrow 85. On the side of the a joint 2, the step surface 80b3 may not be used. plug.

Japanese Patent Publication No. Hei 8-235989 discloses an invention in which a ridge is provided on a lower surface of a card to move on a guide rail provided on an insulating cover, thereby preventing the card from falling off. However, the configuration of the above publication makes The sliding motion of the card is performed in a straight line. In the first reference example, the structure of the above-mentioned publication corresponds to the relationship between the hanging pieces 88a, 89a formed on one of the cards 8, 8' and the arm portions 88, 89 and the insulating partition 46 sandwiched therebetween. Further, the structure of the above-mentioned publication corresponds to the relationship between the inner facing faces 88c, 80c of the arms 88, 89 and the segments 88d, 89d and the guide rail 91a of the upper cover 9.

[Summary of the first reference example]

By summarizing the above first reference example, the following outline can be obtained.

The electromagnetic relay of the first reference example causes the armature to be shake-shifted by an electromagnet, and the rocking displacement is converted into a sliding displacement of the card by the card locked to one end side of the armature, by the card The movable contact to the other end side of the card is in contact with or separated from the fixed contact, and the state of the contact is switched. The card is restrained from being displaced along the sliding direction of the card by the arms on both sides of the electromagnetic relay body (the card is guided in the sliding direction by the two side walls). The side portion on one end side of the card has protrusions extending toward the respective side walls. The two side walls have guide grooves that extend toward the sliding direction and that are respectively fitted into the respective protrusions.

In this type, when the card slides in the sliding direction, the protrusion moves within the guiding groove. The one end of one side of the card is locked by the movable contact terminal, and the other end of the card is locked by the projection fitted to the guide groove. Thereby, even if a configuration of a small number of contacts is used, the locked state between the card and the armature can be stably maintained, and the reliability can be improved.

Further, in the electromagnetic relay of the first reference example, the guide groove extends over one of the sliding directions of the card beyond the sliding range of the protrusion of the card. Preferably, the extended end portion is open at an end portion of the side wall and communicates with an introduction groove into which the protrusion can be introduced.

By this type, the projection can be easily introduced through the guide groove. Further, when the card is fitted into both side walls, it is not necessary to deform the both side walls and expand to the outside. Therefore, it is possible to suppress the projection from being cut, and it is possible to suppress breakage of the main body and the card.

Further, in the electromagnetic relay of the first reference example, one of the sliding directions of the card forming the introduction groove is preferably a displacement position of the card in the excited state of the electromagnet.

In this type, the introduction groove is formed at the end of the card on the side of the displacement position in the exciting state of the electromagnet block, so that when in the non-excited state, the protrusion is disposed at the end of the guide groove closed ( The end of the introduction groove is not set). Therefore, no matter what kind of collision is applied to the electromagnetic relay, the collision can cause the protrusion of the card to pass through the introduction groove, thereby suppressing the falling off, and the impact resistance can be further improved.

Further, in the electromagnetic relay of the first reference example, the projection has a pin shape in which a portion having two outer diameters is connected to the axial direction, and a small diameter portion on the distal end side is fitted into the guide groove, and a large diameter on the proximal end side. The portion is present between the side wall and the side surface of the card, and the step surface between the large diameter portion and the small diameter portion is slidable on the peripheral portion of the guide groove.

In this type, the small-diameter portion on the distal end side is fitted into the guide groove, and the large-diameter portion on the proximal end side exists between the side wall and the side surface of the card. The step surface between the small diameter portion and the large diameter portion is located at a peripheral portion of the guide groove, and slides on the peripheral portion. Therefore, there is a large diameter portion of the protrusion in the gap between the card and the side wall of the body, so that the tolerance of the card can be made small. Thereby, a stable sliding motion of the card can be achieved.

Further, in the electromagnetic relay of the first reference example, the movable contact and the fixed contact may be respectively disposed on both sides of a center line of the card extending in the sliding direction of the card to form a one-to-one combination. One side is a normally open contact and the other side is a normally closed contact.

In this configuration, the protrusions of the two-stage configuration described above suppress the tolerance of the card, whereby the rotation of the card in the off-axis can be suppressed. Further, when the minimum contact structure such as 1a1b is used, the card becomes short and is easy to rotate, so that it is particularly effective.

Further, the control device of the first reference example includes the electromagnetic relay of the first reference example.

With this type, it is possible to realize a control device having high reliability in the event of a collision or the like.

<Second Reference Example>

In the past, an electromagnetic relay was disclosed in Japanese Laid-Open Patent Publication No. 2005-294162. In the electromagnetic relay, as shown in Figs. 30 and 31, the armature 102 is subjected to a rocking displacement by an electromagnet, and the rocking is displaced by a card 103 that is locked to one end of the armature 102. The slide position is converted into the card 103, and the contact state is switched by the movable contact 104 locked to the other end of the card 103 being in contact with or separated from the fixed contact 105.

Further, a pair of holes 104a are formed at the tip end of the movable contact 104 for collision at the time of dropping or the like. Corresponding to this, a projection 103a of the insertion hole 104a is formed inside the frame of the card 103, and a locking piece 103b for suppressing vibration of the tip end portion of the movable contact 104 is provided. Thereby, the simple embedding action enables the card 103 to be combined to the movable contact 104. Further, the portion on the other end side of the card 103 is suppressed from falling off due to the above collision. On the other hand, on the one end side of the card 103, the pair of concave corners 102a formed on the tip end side of the armature 102 are fitted into the projections 103c formed inside the frame of the card 103, whereby the card 103 can be made Combined to the armature 102. Further, the portion on the one end side of the card 103 is suppressed from falling off due to the above collision.

In the above-described prior art, the armature 102 is an iron piece. The projection 103c of the card 103 composed of the resin molded article is fitted into the concave corner 102a of the armature 102. However, when the armature 102 for driving the card 103 becomes heavy, there is a problem that the electromagnet 101 is also enlarged. Therefore, it is considered that the portion attracted to the yoke 106 of the armature 102 is regarded as an iron piece, and the remaining portion is regarded as a resin molded article.

However, in this case, when the combination is performed, since the card 103 or the armature 102 is cracked due to the same resin molded article, the convex portion 102b which forms the projection 103c or the concave corner 102a is subjected to cutting, and there is a problem that powder is generated.

Therefore, the object of the second reference example is to provide an electromagnetic relay that transmits power of an armature to a movable contact through a card, and a control device using the same, wherein the meshing portion between the armature and the card is formed of a resin The formation of the product can also prevent the adverse conditions caused by it.

In the following, the second reference example will be described, and the same reference numerals will be given to the same components as those in the first embodiment, and the description thereof will be omitted. In addition, the overall structure of the electromagnetic relay 1 of the second reference example is almost the same as that of the above-described first embodiment, and therefore the description thereof will be omitted. Only the features of the second reference example will be described in detail below.

The electromagnetic relay 1 of the second reference example has the following configuration. In the electromagnetic relay 1, the armature block 6 has a permanent magnet 63, a movable plate 62, and a sub-card 61 composed of a resin molded article. In the electromagnetic relay 1, in order to reduce the weight, the plate-like tongue piece 65 extending from the sub-card 61 is locked to the locking hole 81 of the card 8.

This configuration is formed in the following manner. That is, after the tongue piece 65 is inserted into the locking hole 81, as shown in Figs. 21, 22, 24, and 25, the tip end portion 650 of the tongue piece 65 is formed to melt the tip end portion 650. The locking claws 651, 652 of the locking hole 81 are passed. As shown in Fig. 25, the tip end portion 650 of the tongue piece 65 has a shape that expands on both sides in the width direction of the locking hole 81.

On the other hand, as shown in Fig. 22, a position along the center line 8x of the card 8 near the corner portion of the locking hole 81 is formed along the tongue piece 65. The protrusions 81a, 8b and the projections 81c, 81d (indicated by oblique lines) of the tongue piece 65 are joined in the thickness direction. The back surfaces of the projections 81a and 81b and the projections 81c and 81d are inclined surfaces 81e (FIG. 25) that allow the tongue piece 65 to swing.

With such a configuration, as described above, in order to reduce the weight, even if the tongue piece 65 of the armature block 6 locked to the card 8 is formed of resin, the locked state between the armature and the card can be stably maintained. That is, the molten portion of the tip end portion 650 of the tongue piece 65 composed of the resin molded article is the locking claws 651, 652 having the claw portions 651a, 651b and the claw portions 652a, 652b. The claw portions 651a, 651b and the claw portions 652a, 652b are locked to the projections 81a, 81b and the projections 81c, 81d formed in the locking hole 81, and the tongue piece 65 is prevented from being detached from the locking hole 81 of the card 8. Thereby, it is possible to prevent the occurrence of defects in the resin molded article which causes cracks, powders, and the like at the time of locking.

Further, the formation of the claws 651a, 651b and the locking claws 651, 652 of the claw portions 652a, 652b can be easily obtained with high reliability using a technique such as welding. Therefore, it is possible to prevent the occurrence of a problem such as the use of an adhesive to engage the locking piece to prevent falling off, which may cause it to be joined to an unintended peripheral position.

On the flat spring-like movable contact terminals 22, 32, the tongues 22f, 32f of the locking holes 86, 87 of the card 8 are inserted as shown in Fig. 22, and the leading ends thereof are bent, on the locking holes 86, 87. The projections 86a, 86b, 86c and the projections 87a, 87b, 87c are formed, whereby a locking action is produced. For example, as shown in the joint configuration of 3a1b, 5a1b, etc., when the contacts of the complex array are arranged along the sliding direction 82 of the card 8, the locking of the plurality of movable contacts makes it difficult to fall off the tongue 65.

However, as shown in the contact structure of 1a1b of the second reference example, when the card 8 When the number of contacts in the sliding direction 82 is one set, the locking effect generated by the movable contact terminals 22, 32 is small, so that the locking claws 651, 652 of the tip end portion 650 of the tongue piece 65 as described above are generated. The carding measures are particularly effective.

Further, as shown in the second reference example, if the return spring 7 is further provided between the armature block 6 on the card 8 and the movable contact terminals 22, 32, when the card faces the opposite direction to the return spring 7 When the direction is displaced, that is, when the card 8 is displaced in the opposite direction to the arrow 82, the force acts in the direction in which the card 8 is pressed. When such a force acts, the tongue piece 65 is easily detached from the locking hole 81. Therefore, in this case, the second reference example is particularly effective.

By using such an electromagnetic relay 1 for controlling a control device for a working machine, a production line or the like, the control device can be made lighter, and it is particularly suitable for use as a safety relay requiring many electromagnetic relays 1.

[Summary of the second reference example]

By summarizing the above second reference example, the following outline can be obtained.

The electromagnetic relay of the second reference example causes the armature to be shaken and displaced by the electromagnet, and the rocking displacement is converted into the sliding displacement of the card by the card locked to the armature, by latching to the card The movable contact contacts or separates from the fixed contact to switch the contact state. The armature includes a movable plate driven by the electromagnet and a permanent magnet to which a magnetic force is applied, and a sub-card formed of a resin molded article and integrally attached to the movable plate. On the sub-card, a plate-shaped tongue that is locked to the card and has a sliding direction of the card as a thickness direction is formed. The card forms a locking hole formed of a resin molded article and into which the tongue piece can be fitted. The tip end portion of the tongue has a locking formed by the melting of the tip end portion across the locking hole claw.

In this type, in order to reduce the weight, even if the tongue piece 65 of the armature block 6 of the card 8 is formed of resin, the locking claw formed by the tip end portion of the melted tongue piece can be provided, so that it can be stabilized. Maintain the locked state between the armature and the card. Thereby, it is possible to prevent the occurrence of defects in the resin molded article which causes cracks, powders, and the like at the time of locking. Further, the locking claws can be easily obtained with high reliability using techniques such as welding. Therefore, it is possible to prevent the occurrence of a problem such as the use of an adhesive to engage the locking piece to prevent falling off, which may cause it to be joined to an unintended peripheral position.

Further, in the electromagnetic relay of the second reference example, the return spring can be further locked between the armature on the card and the movable contact with respect to the card.

As shown in this type, if a return spring is further provided between the armature and the movable contact, when the card is displaced in a direction opposite to the biasing direction of the return spring, the force acts in the direction in which the card is pressed. When such a force acts, the tongue is easily detached from the locking hole 81. Therefore, in this case, the second reference example is particularly effective.

Further, in the electromagnetic relay of the second reference example, it is particularly effective when one set of the above-mentioned contacts is provided in the sliding direction of the card.

For example, as shown in the contact structure of 3a1b, 2a2b, 5a1b, etc., when a complex array of contacts is provided along the sliding direction of the card, the plurality of movable contacts act to lock the card, making it difficult to fall off the tongue. . On the other hand, as shown in the contact structure of 1a, 1a1b, etc., when the number of contacts in the sliding direction of the card is one set, the locking effect by the movable contact is small, so the second reference example The locking measures generated by the locking claws at the tip end portions of the tongue pieces are particularly effective.

The control device of the second reference example includes the above electromagnetic relay.

By this type, the control device can be made lightweight, and it is particularly suitable for use as a safety relay that requires many electromagnetic relays.

1. . . Electromagnetic relay

1a, 1b. . . contact

100. . . Electromagnetic relay

101~104. . . a contact

105~106. . . b contact

101a~106a. . . contact

101b~106b. . . Locking hole

101c~106c. . . Claw claw

107. . . card

108. . . Electromagnet

109. . . Return spring

110. . . arrow

111. . . Armature

120. . . Electromagnetic relay

121. . . card

123. . . a contact

123a, 124a. . . Movable contact

125. . . Electromagnet

126. . . Armature

127. . . arrow

128. . . direction

124. . . b contact

2. . . a (normally open: NO) contact

21a, 22a, 31a, 32a. . . Curved part

21b, 22b, 31b, 32b. . . Lower end

3. . . b (normally closed: NC) contact

21,31. . . Fixed contact terminal

22,32. . . Movable contact terminal

21c, 22c, 31c, 32c. . . Upper arm

21d, 22d, 31d, 32d. . . Contact element

21e, 31e. . . Rib

22f, 32f. . . Tab

22g, 32g. . . Protrusion

22e, 32e. . . Narrow slit

4,4’. . . Ontology

40,45,46. . . Insulating partition

41. . . Base

42,43,42’,42”,43’,43”. . . Side wall

42a, 43a. . . Guide groove

42b, 43b. . . Leading groove

44. . . Linking component

45a. . . Upper end

46a. . . Difference surface

46b. . . Upper end

47. . . Terminal block

48. . . hole

49. . . Trench

5. . . Electromagnet square

51. . . Coil

52. . . Spool

52a. . . Flange

53. . . core

54,55. . . Yoke

56. . . Coil terminal

6. . . Armature block

61. . . Daughter card

62. . . Movable plate

63. . . permanent magnet

64. . . plug

65. . . Tab

650. . . Apex

651,652. . . Claw claw

651a, 651b, 652a, 652b. . . Claw

69. . . arrow

7,7a,7b,7c,7d,7e,7f,7g. . . Return spring

71. . . Lower end

71a, 71b. . . Protrusion

73,74. . . Upper end

75,76. . . Apex

75a, 76a, 76b, 76c, 76d, 76e, 76f, 76g. . . Protrusion

76h, 76i. . . Straight line

76j, 76k. . . Step difference

77. . . Narrow slit

78. . . direction

79. . . Mold release direction

8,8’. . . card

8x. . . Center line

80. . . Linkage

80a, 80a', 80b, 80b', 80c, 80d, 80d', 80e. . . Protrusion

80a1. . . Shaft

80a2. . . hemisphere

80b1‧‧‧ Small Trails Department

80b2‧‧‧Great Path Department

Paragraph 80b3‧‧‧

81‧‧‧ card hole

81a, 81b, 81c, 81d‧‧‧ protrusion

81e‧‧‧ sloped surface

82,85‧‧‧ arrow

83,84‧‧‧Return to spring hole

83a, 83b, 83c, 84a, 84b, 84c‧‧

86,87‧‧‧ card hole

86a, 86b, 86c, 87a, 87b, 87c‧‧

88,89‧‧‧arm

88a, 89a‧‧‧Drop

88b, 89b‧‧‧ lower end

88c, 89c‧‧‧Intermediate facing

88d, 89d‧‧‧

9‧‧‧Upper cover

91‧‧‧ top board

91a‧‧‧rail

91b‧‧‧ lower end

Fig. 1 is an exploded perspective view showing an electromagnetic relay according to a first embodiment of the present invention.

Fig. 2 is a perspective view showing the assembled state of Fig. 1.

Fig. 3 is a plan view of Fig. 2.

4(a) and 4(b) are vertical sectional views for explaining the operation of the above electromagnetic relay.

Fig. 5(a) is a perspective view showing a tip end portion of a return spring in the electromagnetic relay according to the first embodiment of the present invention, and Fig. 5(b) is a view showing an enlarged front end portion of the return spring and a card stuck thereto Return to the plan view near the spring hole.

Fig. 6(a) is a perspective view showing a modification of the tip end portion of the return spring in the electromagnetic relay according to the first embodiment of the present invention, and Fig. 6(b) is an enlarged view of the tip end portion of the return spring and the latching portion thereof A plan view of a modification of the return spring hole of the upper card.

Fig. 7(a) is a perspective view showing a tip end portion of a return spring in the electromagnetic relay according to the second embodiment of the present invention, and Fig. 7(b) is a perspective view showing a modification of the tip end portion of the return spring.

Fig. 8(a) is a perspective view showing a tip end portion of a return spring in the electromagnetic relay according to the third embodiment of the present invention, and Fig. 8(b) is a perspective view showing a modification of the tip end portion of the return spring.

Fig. 9(a) is a perspective view showing a tip end portion of a return spring in the electromagnetic relay of the fourth embodiment of the present invention, and Fig. 9(b) is a perspective view showing a modification of the tip end portion of the return spring.

Fig. 10 is a cross-sectional view showing the vicinity of the return spring hole of the card on which the return spring of the Fig. 9 is enlarged and the card stuck thereon.

Fig. 11 is an exploded perspective view showing the electromagnetic relay of the first reference example.

Fig. 12 is a perspective view showing the assembled state of Fig. 11.

Figure 13 is a plan view of Fig. 12.

14(a) and 14(b) are vertical sectional views for explaining the operation of the electromagnetic relay of the first reference example.

Fig. 15 is a side view showing the body of the first reference example.

Fig. 16(a) is a plan view showing a card of the first reference example, and Fig. 16(b) is a side view thereof.

Figures 17(a) and 17(b) are side views of Figures 14(a) and 14(b).

Fig. 18(a) and Fig. 18(b) are side views showing the body of another type of the first reference example.

Fig. 19(a) is a plan view showing a card of another type of the first reference example, Fig. 19(b) is an enlarged view of the vicinity of the protrusion of the card, and Fig. 19(c) is a side view of the card.

Fig. 20 is an exploded perspective view showing the electromagnetic relay of the second reference example.

Fig. 21 is a perspective view showing the assembled state of Fig. 20.

Figure 22 is a plan view of Figure 21.

23(a) and 23(b) are vertical sectional views for explaining the operation of the electromagnetic relay of the second reference example.

Fig. 24 is an enlarged view of the vicinity of the tongue piece and the locking hole in Fig. 22.

Fig. 25 is a sectional view taken along line XXV-XXV of Fig. 22.

Fig. 26 is an exploded perspective view showing a conventional electromagnetic relay.

Figure 27 is a vertical sectional view of another conventional electromagnetic relay.

Figure 28 is a cross-sectional view showing the electromagnetic relay of Figure 27 cut in a plane parallel to the horizontal direction.

Figure 29 is a cross-sectional view taken along line XXIX-XXIX of Figs. 27 and 28.

Figure 30 is an exploded perspective view showing another conventional electromagnetic relay.

Figure 31 is a perspective view showing the electromagnetic relay of Figure 30.

2. . . a (normally open: NO) contact

21a, 22a, 31a, 32a. . . Curved part

21b, 22b, 31b, 32b. . . Lower end

22f, 32f. . . Tab

3. . . b (normally closed: NC) contact

21,31. . . Fixed contact terminal

22,32. . . Movable contact terminal

21c, 22c, 31c, 32c. . . Upper arm

21d, 22d, 31d, 32d. . . Contact element

21e, 31e. . . Rib

22e, 32e. . . Narrow slit

4. . . Ontology

40,45,46. . . Insulating partition

41. . . Base

42,43. . . Side wall

44. . . Linking component

45a. . . Upper end

46a. . . Difference surface

46b. . . Upper end

47. . . Terminal block

49. . . Trench

5. . . Electromagnet square

51. . . Coil

52. . . Spool

52a. . . Flange

54,55. . . Yoke

56. . . Coil terminal

6. . . Armature block

61. . . Daughter card

64. . . plug

65. . . Tab

7. . . Return spring

71. . . Lower end

71a, 71b. . . Protrusion

73,74. . . Upper end

75,76. . . Apex

8. . . card

80. . . Linkage

81. . . Locking hole

82,85. . . arrow

83,84. . . Regression spring hole

86,87. . . Locking hole

88,89. . . Arm

88a, 89a. . . Drop down

88b, 89b. . . Lower end

88c, 89c. . . Medial facing surface

88d, 89d. . . Segment

9. . . Upper cover

91. . . roof

91a. . . guide

91b. . . Lower end

Claims (7)

An electromagnetic relay comprising: an electromagnet; an armature, which generates a rocking displacement by the electromagnet; a card, which is locked with the armature and is displaced by the armature of the armature to generate a sliding displacement; a movable contact, The card is locked with the card; the fixed contact can be switched by the contact or separation with the movable contact; and the return spring is disposed between the armature and the movable contact and the card is locked; The movable contact and the fixed contact are respectively disposed on both sides of a center line of the card extending along the sliding direction of the card to form a combination, and a combination of one side of the center line is a normally open contact a combination of the other side of the center line is a normally closed contact; the return spring has a protrusion formed by sheet metal processing at a tip end portion thereof, and the card has a locking hole inserted into a tip end portion of the return spring, The projection is locked to the locking hole. The electromagnetic relay of claim 1, wherein the return spring has a slit in the vicinity of the protrusion. The electromagnetic relay of claim 1, wherein the protrusion has a semi-cylindrical shape, and a surface thereof is in linear or surface contact with the locking hole. Such as the electromagnetic relay of claim 1 of the patent scope, wherein the above The return spring is divided into a plurality of shapes by the sheet metal forming, and the plurality of divided portions in the leading end portion include a linear divided portion and a divided portion having a step formed by bending processing The portions are alternately arranged in a zigzag shape, and a portion of the divided portion having the step higher than the step has a function as the protrusion, and the protrusion is locked to the locking hole. The electromagnetic relay according to claim 4, wherein in the return spring, the linear divided portion and the lower end portion are located on a same plane, and the protrusion having the stepped portion is oriented toward the plane One side protrudes. The electromagnetic relay according to claim 5, wherein the step is subjected to bending in a direction opposite to a direction in which the mold is released from the mold during the bending process. A control device comprising the electromagnetic relay of any one of claims 1 to 6.