JP2015018763A - Movable contact piece and electromagnetic relay having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable contact that is less in consumption power, fewer in components and in man days for assembly, and high in productivity.SOLUTION: A movable contact piece 60 is designed such that three conductive thin plate springs 61, 65, 67 are stacked, one end parts thereof are fixed and integrated to a movable contact terminal 54, movable contacts 56, 57 are fixed and integrated on the free-end side, and it is turned and driven in the direction of plate thickness by means of a card 40 that engages the free end, thereby bringing the movable contacts 56, 57 into contact with fixed contacts 52, 53 or separating them from these contacts. In particular, the free end of the conductive thin plate spring 61 located on the inner face side is provided with a driving elastic tongue 64a that engages the card 40. Additionally, the free end of the conductive thin plate spring 67 located on the outer face side has a pair of returning elastic tongues 67b, 67c, cut and raised to come into contact with the card 40 on one side in a process shifting from the state in which the movable contacts 56, 57 are abutting on the fixed contacts 52, 53 to the state in which they are open and separate.

Description

  The present invention relates to a movable contact piece, and more particularly to a movable contact piece in which at least two conductive leaf springs are stacked.

  Conventionally, for example, an elastic contact piece 4 in which three conductive leaf springs are stacked is formed on the movable contact piece, and one end of the movable contact piece is fixed to the first relay terminal 2 while the other end, which is the free end 5, is fixed to the movable contact piece. There is one in which the contact button 6 is fixed by crimping (see Patent Document 1).

US Pat. No. 6,661,319

However, since the actuator 13 merely pulls up the elastic contact piece 4 in the above-described movable contact, if contact welding occurs during the operation in which the movable contact 6 abuts against the fixed contact 3, a large opening force is required. , Big power consumption is necessary.
Further, as shown in FIGS. 3, 4, and 5, it is necessary to fix the additional elastic piece 16 to the free end 5 of the strip-shaped elastic contact piece 4, which requires a large number of parts and assembly steps and is low in productivity. There is a problem.
In view of the above problems, the movable contact piece according to the present invention aims to provide a movable contact piece with low power consumption, a small number of parts and assembly steps, and high productivity, and an electromagnetic relay including the same. To do.

  The movable contact piece according to the present invention has a structure in which at least two conductive thin plate springs are stacked and one end portion is fixed and integrated with the movable contact terminal, while the movable contact is fixed to the free end side. A movable contact piece for bringing the movable contact into and out of contact with the fixed contact by being rotated and driven in the thickness direction by a card engaging with the free end, and one conductive thin plate spring An elastic tongue for driving that engages with the card is provided at the free end of the card, and the movable contact and the fixed contact are separated from the free end of the other conductive thin plate spring. In the process of transitioning to a state, a pair of return elastic tongue pieces that come into contact with the card is provided.

According to the present invention, the pair of elastic return tongues that come into contact with the card at the time of return are cut and raised at the free end of the conductive thin leaf spring located on the outward face side, so that only the tensile force is applied to the movable contact piece. In addition, since a torsional moment also acts, even when contact welding occurs, the movable contact can be easily opened and a movable contact piece with low power consumption can be obtained.
Further, since the driving elastic tongue piece and the return elastic tongue piece are cut out from the free ends of different conductive thin plate springs, the number of parts and the number of assembling steps are small, and a movable contact piece with high productivity can be obtained.

As an embodiment of the present invention, among the movable contact pieces made of three conductive thin plate springs, a position where the free end of the conductive thin plate spring located in the middle is engaged with both sides of the card to regulate the position. A restricting elastic tongue piece may be provided.
According to this embodiment, it is possible to regulate the backlash of the movable contact piece in the width direction with the position restricting elastic tongue piece, and to obtain a movable contact piece with no variation in operation characteristics.

As another embodiment of the present invention, a spring constant adjusting slit may be provided in at least one of the conductive thin plate springs.
According to the present embodiment, it is possible to obtain a movable contact piece that can easily meet customer demands, is easy to design, and has a high degree of freedom.

As another embodiment of the present invention, the intermediate portions of the conductive thin plate springs may be provided with curved portions having different sizes and overlapping shapes.
According to the present embodiment, even if both ends of the movable contact piece are fixed and integrated, the movable contact piece having smooth operation characteristics can be obtained by the curved portion absorbing and relieving the strain accompanying elastic deformation. .

As another embodiment of the present invention, a pair of movable contacts may be juxtaposed in the width direction on the free end side of the stacked conductive thin leaf springs.
According to this embodiment, since it becomes a twin contact structure, a movable contact piece with high contact reliability is obtained.

  The electromagnetic relay according to the present invention is configured to include any of the aforementioned movable contact pieces in order to achieve the above-described problem.

According to the present invention, the pair of elastic return tongues that come into contact with the card at the time of return are cut and raised at the free end of the conductive thin leaf spring located on the outward face side, so that only the tensile force is applied to the movable contact piece. In addition, since a torsional moment also acts, even if contact welding occurs, an electromagnetic relay can be obtained that can easily open the movable contact and consumes less power.
In addition, since the driving elastic tongue piece and the return elastic tongue piece are cut out from the free ends of different conductive thin plate springs, there is an effect that the number of parts and assembly man-hours are small and a highly productive electromagnetic relay can be obtained. .

FIG. A is an overall perspective view of an electromagnetic relay to which the first embodiment according to the present invention is applied, and FIG. B is a perspective view showing a state where a cover is removed from the first embodiment of FIG. FIGS. A and B are plan views showing before and after operation. It is a disassembled perspective view of 1st Embodiment shown in FIG. 1A. It is the disassembled perspective view seen from the angle different from FIG. It is a perspective view of the box-shaped base shown in FIG. 1B. It is a principal part disassembled perspective view of 1st Embodiment shown in FIG. 1B. FIGS. A, B and C are a front view, a bottom view and a rear view of the contact mechanism shown in FIG. FIGS. A and B are a plan view and a cross-sectional view of the card shown in FIG. FIGS. A and B are a partially enlarged perspective view and a bottom view of the drive mechanism shown in FIG. FIGS. A and B are a front view and a rear view showing a contact mechanism part of a second embodiment according to the present invention. FIGS. A and B are a bottom view of the contact mechanism shown in FIG. 10 and a perspective view of a third conductive thin plate spring.

An electromagnetic relay which is an embodiment to which the present invention is applied will be described with reference to the accompanying drawings of FIGS.
The electromagnetic relay according to the first embodiment includes a box-shaped base 10, an electromagnet block 20, a rotating block 30, a card 40, a contact mechanism 50, a support plate 70, and a cover 80. .

As shown in FIG. 5, the box-shaped base 10 has a planar rectangular shallow box shape, and the inside thereof is partitioned by an insulating wall 11 having an operation cutout portion 11 a, and a first recess 12. And a second recess 13 is formed. Further, the box-shaped base 10 has a shallow groove 14a extending vertically along the outer surface thereof, and a latch receiving portion 14b protruding from the bottom surface of the shallow groove 14a.
The first recess 12 is provided with a bearing portion 16 for supporting a rotation shaft portion 34a of the rotation block 30 described later on the bottom surface thereof, and is opposed to the bearing portion 16 therebetween. Positioning recesses 17a and 17b for positioning an electromagnet block 20 to be described later are provided at the positions. Further, a notch step portion 18 for positioning a spool 21 of an electromagnet block 20 described later is provided at the opening edge portion of the first recess 12.
Furthermore, terminal grooves 15a and 15b for assembling a fixed contact terminal 51 and a movable contact terminal 54 of a contact mechanism section 50, which will be described later, are formed at the opening edge of the second recess 13.

As shown in FIG. 6, the electromagnet block 20 has a coil 23 wound around a spool 21 having flanges 22a and 22b at both ends, and an iron core 24 is inserted into a through hole 22c provided in the spool 21, The yokes 25 and 27 are caulked and fixed to both projecting ends. The yokes 25 and 27 are formed by bending plate-like magnetic materials having wide portions 26 and 28 each punched into a substantially T shape into an L-shaped cross section. Then, a pair of coil terminals 29, 29 are appropriately press-fitted into a plurality of terminal holes provided in the flange portion 22a of the spool 21, and lead wires of the coil 23 are respectively tangled to the coil terminals 29, 29 and soldered. It is.
In addition, by arranging a total of five terminal holes in the collar portion 22a, the number of coil terminals 29 and the press-fitting position can be appropriately selected according to customer needs and specifications. In addition, the coil terminal 29 does not have to be a simple bar shape, and may have a substantially T shape, for example, if necessary.

  The rotating block 30 has a rotating block body 33 formed by sandwiching a permanent magnet (not shown) between a pair of plate-shaped movable iron pieces 31 and 32 and insert molding. The rotating block body 33 has rotating shaft portions 34 a and 34 b projecting on the same upper axis on the upper and lower surfaces facing each other, and a driving arm portion 35 is integrally formed on the side surface of the rotating block body 33. Molded. The driving arm portion 35 has an engaging claw portion 36 formed at the tip thereof.

  As shown in FIG. 8, the card 40 has a drive hole 41 on one end side and an engagement hole 42 on the other end side. Further, driving protrusions 43 and 44 project from the adjacent corners on the one end side in opposite directions, have a substantially planar T shape, and have a full-safe protrusion 45 at the edge of the driving hole 41. Is protruding. Of the drive protrusions 43, 44, one drive protrusion 43 is larger in thickness than the other drive protrusion 44, and has a shape in which a movable contact piece 60 described later cannot abut simultaneously. .

As shown in FIGS. 6 and 7, the contact mechanism unit 50 includes a fixed contact terminal 51 and a movable contact terminal 54. In FIG. 7, for convenience of explanation, the distal end portions of the return elastic tongue pieces 67 b and 67 c provided at the free end portion of the second conductive thin plate spring 65 are shown in a partially cut away state.
A pair of fixed contacts 52 and 53 are fixed to the fixed contact terminal 51 in the width direction at one end thereof.
On the other hand, the movable contact terminal 54 has the movable contact piece 60 fixed by caulking at one end thereof, and an operation hole 55 is provided at the lower end thereof. The movable contact piece 60 has a structure in which three first, second, and third conductive thin plate springs 61, 65, 67 are sequentially stacked, and a pair of movable contacts 56, 57 are provided at the free ends thereof. They are integrated by caulking in the width direction.

  The first conductive thin plate spring 61 has a spring constant adjusting slit 62a extending from one end portion to which the caulking is fixed toward the free end portion, and absorbs and alleviates expansion and contraction when rotating in the middle portion. In order to ensure smooth operation characteristics, a substantially U-shaped curved portion 63a is provided. The first conductive thin plate spring 61 has its free end divided into three in the width direction, a driving elastic tongue 64a is formed at the center thereof, and reinforcing elastic tongues 64b and 64c are formed on both sides thereof. It is provided.

  The second conductive thin leaf spring 65 has a spring constant adjusting slit 62b extending from one end portion to which the caulking is fixed toward the free end portion, and absorbs and relaxes expansion and contraction when it rotates in the middle portion. In order to ensure smooth operation characteristics, a substantially U-shaped curved portion 63b is provided. Further, the second conductive thin plate spring 65 is formed with an engagement notch 66a at the center of the free end thereof, and the inner edge of the engagement notch 66a is opposed to raise the position. Elastic tongue pieces 66b and 66c are formed.

  The third conductive thin plate spring 67 is provided with a substantially U-shaped curved portion 63c in the middle portion thereof to absorb and relieve expansion and contraction when rotating, and to ensure smooth operation characteristics. In addition, the third conductive thin plate spring 67 is obtained by dividing the free end portion of which the center portion is notched into three in the width direction and bending it in the same direction, whereby the position restricting elastic tongue piece 67a and the return elastic member 67a. Tongue pieces 67b and 67c are formed.

  The spring constant can be changed by appropriately adjusting the width and length dimensions of the slits 62a and 62b provided in the first and second conductive thin plate springs 61 and 65, respectively. For this reason, it is easy to adjust the spring load at the time of operation and return, and there is an advantage that the degree of freedom of design is large.

  As shown in FIG. 3, the support plate 70 is bridged with its both ends locked to the opening edge of the box-shaped base 10. Then, the support plate 70 is fitted into the bearing hole 71 provided in the center thereof with the rotation shaft portion 34b of the rotation block 30, and the rectangular holes 72 and 72 provided on both sides of the bearing hole 71 are provided with the above-described support holes. By fitting the other end portions 26b, 28b of the wide portions 26, 28 of the yokes 25, 27, the electromagnet block 20 and the rotating block 30 can be positioned with high assembly accuracy.

  The cover 80 has a planar rectangular shape that can cover the opening of the box-shaped base 10, and an elastic locking portion 81 extends downward from each side of the outer peripheral edge.

The procedure for assembling the electromagnetic relay will be described.
First, as shown in FIGS. 3 and 5, one end of the wide portions 26 and 28 of the yokes 25 and 27 is formed in the positioning recesses 17 a and 17 b provided on the bottom surface of the first recess 12 of the box-shaped base 10. 26a and 28a are fitted and positioned. Further, positioning is performed by fitting the flange portion 22 a of the spool 21 to the notch step portion 18 of the box-shaped base 10. In this embodiment, since the electromagnet block 20 is positioned at a plurality of locations on the box-shaped base 10, there is an advantage that assembly accuracy is high. Then, the fixed contact terminal 51 is press-fitted into the terminal groove 15a of the second recess 13 and positioned.

On the other hand, as shown in FIGS. 3 and 9, the card 40 is inserted into the operation hole 55 of the movable contact terminal 54, and the card 40 is assembled to the movable contact piece 60 that is caulked and fixed to the movable contact terminal 54. For convenience of explanation, the movable contact terminal 54 is not shown in FIG.
That is, as shown in FIG. 9, the elastic tongue piece 64a for driving the first conductive thin plate spring 61 is inserted into the drive hole 41 of the card 40, and the elastic tongue piece for position regulation of the second conductive thin plate spring 65 is inserted. 66b, 66c engages both sides of the card 40 to restrict (hold) the position. Then, the elastic tongue 67a for position restriction of the third conductive thin plate spring 67 is locked to one end of the card 40, and the elastic tongues 67b and 67c for return are driven protrusions 43 and 44 of the card 40. Are engaged with each other to regulate the position in the vertical direction. Further, the engaging claw portion 36 of the rotating block 30 is engaged with the engaging hole 42 of the card 40 and inserted into the box-shaped base 10 as it is. And the said card | curd 40 is inserted in the notch 11a for operation of the insulating wall 11 of the said box-shaped base 10, and the said movable contact terminal 54 is press-fitted and positioned in the said terminal groove 15b. Next, the rotation shaft portion 34a of the rotation block 30 is fitted into the bearing hole 16 of the box-shaped base 10, and the rotation block 30 is rotatably supported.

Further, both ends of the support plate 70 are engaged and bridged to the opening edge of the box-shaped base 10, and the rotation shaft portion 34 b of the rotation block 30 is fitted into the bearing hole 71 and the positioning square is fitted. The other ends 26b and 28b of the wide portions 26 and 28 of the yokes 25 and 27 are fitted and positioned in the holes 72 and 72, respectively. For this reason, the electromagnet block 20 and the rotation block 30 are positioned with high positional accuracy on the box-shaped base 10, and there is an advantage that there is no variation in operating characteristics.
Finally, the cover 80 is positioned so as to cover the opening of the box-shaped base 10, and the elastic locking portion 81 of the cover 80 is locked to the locking receiving portion 14b of the box-shaped base 10, Assembly work is completed.

Next, the operation of this embodiment will be described.
As shown in FIG. 2A, the rotating block 30 is configured such that one end portion 32 a of the movable iron piece 32 is attracted to the wide portion 26 of the yoke 25 by the magnetic force of a permanent magnet (not shown), and The other end 31 b is adsorbed to the wide portion 28 of the yoke 27. For this reason, the movable contact piece 60 is pulled in the direction of the movable contact terminal 54 against the spring force via the card 40. As a result, the movable contacts 56 and 57 are separated from the fixed contacts 52 and 53, respectively. For convenience of explanation, the support plate 70 is not shown in FIGS. 2A and 2B.

  The coil 23 is excited by applying a voltage so that a magnetic force in a direction to cancel the magnetic force of the permanent magnet of the electromagnet block 20 is generated. As a result, one end 31 a of the movable iron piece 31 of the rotating block 30 is attracted to the wide portion 26 of the yoke 25 and the movable iron piece 32 of the rotating block 30 is attracted to the wide portion 28 of the yoke 27. The other end 32b is sucked and the turning block 30 is turned. For this reason, the driving arm portion 35 presses the card 40, and further, the spring force of the movable contact piece 60 acts on the card 40 via the driving elastic tongue 64a. Slide in the direction you head. As a result, the movable contact piece 60 moves in a direction away from the movable contact terminal 54 by its spring force, and the movable contacts 56 and 57 abut against the fixed contacts 52 and 53, respectively. Next, one end 31 a of the movable iron piece 31 of the rotating block 30 is attracted to the wide portion 26 of the yoke 25, and the other end 32 b of the movable iron piece 32 is attracted to the wide portion 28 of the yoke 27. For this reason, even if the application of the voltage to the coil 23 is stopped, the position of the card 40 is fixed, and the movable contacts 56 and 57 and the fixed contacts 52 and 53 are kept in contact with each other. In this state, the distance between the drive protrusion 43 and the return elastic tongue 67b is smaller than the distance between the drive protrusion 44 and the return elastic tongue 67c.

Next, when a voltage in the opposite direction to that described above is applied to the coil 23, one end portion 32 a of the movable iron piece 32 is attracted to the wide portion 26 of the yoke 25, and the other end portion 31 b of the movable iron piece 31 is attracted to the width of the yoke 27. Sucked into the wide portion 28. For this reason, the rotation block 30 rotates in the opposite direction, the card 40 is pulled by the engaging claw portion 36 of the rotation block 30, and the card 40 slides in a direction to be separated from the fixed contact terminal 51. At this time, after the driving projection 43 contacts the return elastic tongue 67b of the third conductive thin plate spring 67, the drive protrusion 44 contacts the return elastic tongue 67c. That is, a process of shifting from the state where the movable contacts 56, 57 and the fixed contacts 52, 53 are in contact with each other to the state where the movable contacts 56, 57 and the fixed contacts 52, 53 are separated from each other. , The card 40 is temporarily brought into contact with the movable contact piece 60, and not only a tensile force but also a torsional moment acts on the third conductive thin plate spring 67. As a result, after the movable contact 56 is separated from the fixed contact 52, the movable contact 57 is separated from the fixed contact 53.
Therefore, even if contact welding occurs, there is an advantage that the movable contacts 56 and 57 can be easily separated from the fixed contacts 52 and 53.

As shown in FIGS. 10 and 11, the second embodiment is substantially the same as the first embodiment described above, except that the driving protrusions 43 and 44 of the T-shaped card 40 have the same shape. In addition, the bending angle of the pair of return elastic tongues 67b and 67c provided at the front edge of the third conductive thin plate spring 67 is different (FIG. 11B).
Therefore, even when the driving projection 44 of the card 40 comes into contact with the return elastic tongue 67c of the third conductive thin plate spring 67 during the return shown in FIGS. The driving protrusion 43 is not in contact with the return elastic tongue 67 b of the third conductive thin plate spring 67.

  As in the first embodiment, when the electromagnet block 20 is excited to rotate the rotating block 30 and the card 40 is slid, the operation of the second embodiment is performed via the first conductive thin plate spring 61. Thus, the movable contacts 56 and 57 are in contact with the fixed contacts 52 and 53 simultaneously.

  Next, when a reverse voltage is applied to the coil 23 of the electromagnet block 20, the rotating block 30 rotates in the reverse direction, and the card 40 is reversed via the engaging claw 36 of the rotating block 30. Slide in the direction. For this reason, after the driving protrusion 43 of the card 40 abuts on the return elastic tongue 67c of the third conductive thin plate spring 67, the drive protrusion 44 returns to the return elastic elasticity of the third conductive thin plate spring 67. A torsional moment is applied to the entire movable contact piece 60 by contacting the tongue piece 67b. For this reason, the card 40 comes into contact with the movable contact piece 60, and not only a tensile force but also a torsional moment acts on the third conductive thin plate spring 67. As a result, after the movable contact 57 is separated from the fixed contact 53, the movable contact 56 is separated from the fixed contact 52. As a result, even if contact welding occurs, there is an advantage that the movable contacts 56 and 57 can be easily separated from the fixed contacts 52 and 53.

  Of course, the movable contact piece and the contact mechanism according to the present invention are not limited to the above-described electromagnetic relay but may be applied to other electromagnetic switches.

10: Box-shaped base 11: Insulating wall 11a: Notch for operation 12: First recess 13: Second recess 15a, 15b: Terminal groove 16: Bearing portion 17a, 17b: Positioning recess 18: Notch step portion 20: Electromagnet block 21: Spool 22a, 22b: collar part 23: coil 24: iron core 25, 27: yoke 26, 28: wide part 29: coil terminal 30: rotating block 31, 32: movable iron piece 33: times Moving block body 34a, 34b: Rotating shaft portion 35: Driving arm portion 36: Engaging claw portion 40: Card 41: Driving hole 42: Engaging hole 43, 44: Driving projection 45: Full safe projection 50: Contact mechanism 51: Fixed contact terminal 52, 53: Fixed contact 54: Movable contact terminal 55: Operation hole 56, 57: Movable contact 60: Movable contact piece 61: First conductive thin plate springs 62a, 6 b: Slit for adjusting spring constant 63a, 63b, 63c: Curved portion 64a: Elastic tongue for driving 64b, 64c: Elastic tongue for reinforcement 65: Second conductive thin plate springs 66b, 66c: Elastic tongue for position regulation 67 : Third conductive thin plate spring 67a: elastic tongue for position regulation 67b, 67c: elastic tongue for return 70: support plate 71: bearing hole 72: rectangular hole for positioning 80: cover 81: elastic locking portion

  The present invention relates to a movable contact piece, and more particularly to a movable contact piece in which at least two conductive leaf springs are stacked.

  Conventionally, for example, an elastic contact piece 4 in which three conductive leaf springs are stacked is formed on the movable contact piece, and one end of the movable contact piece is fixed to the first relay terminal 2 while the other end, which is the free end 5, is fixed to the movable contact piece. There is one in which the contact button 6 is fixed by crimping (see Patent Document 1).

US Pat. No. 6,661,319

However, since the actuator 13 merely pulls up the elastic contact piece 4 in the above-described movable contact, if contact welding occurs during the operation in which the movable contact 6 abuts against the fixed contact 3, a large opening force is required. , Big power consumption is necessary.
Further, as shown in FIGS. 3, 4, and 5, it is necessary to fix the additional elastic piece 16 to the free end 5 of the strip-shaped elastic contact piece 4, which requires a large number of parts and assembly steps and is low in productivity. There is a problem.
In view of the above problems, the movable contact piece according to the present invention aims to provide a movable contact piece with low power consumption, a small number of parts and assembly steps, and high productivity, and an electromagnetic relay including the same. To do.

The movable contact piece according to the present invention has a structure in which at least two conductive thin plate springs are stacked and one end portion is fixed and integrated with the movable contact terminal, while the movable contact is fixed to the free end side. A movable contact piece that contacts and separates the movable contact with the fixed contact by being rotated and driven in the thickness direction with a card that engages with the free end, and the movable contact is fixed A pair of return elastic tongues that come into contact with the card are provided at the free end of the conductive thin plate spring in the process of shifting from the state in which the movable contact and the fixed contact are in contact with each other. In addition, a driving elastic tongue piece that engages with the card is provided at the free end of the conductive thin plate spring other than the conductive thin plate spring .

According to the present invention, the pair of elastic return tongues that come into contact with the card at the time of return are cut and raised at the free end of the conductive thin leaf spring located on the outward face side, so that only the tensile force is applied to the movable contact piece. In addition, since a torsional moment also acts, even when contact welding occurs, the movable contact can be easily opened and a movable contact piece with low power consumption can be obtained.
Further, since the driving elastic tongue piece and the return elastic tongue piece are cut out from the free ends of different conductive thin plate springs, the number of parts and the number of assembling steps are small, and a movable contact piece with high productivity can be obtained.

As an embodiment of the present invention, among the movable contact pieces made of three conductive thin plate springs, a position where the free end of the conductive thin plate spring located in the middle is engaged with both sides of the card to regulate the position. A restricting elastic tongue piece may be provided.
According to this embodiment, it is possible to regulate the backlash of the movable contact piece in the width direction with the position restricting elastic tongue piece, and to obtain a movable contact piece with no variation in operation characteristics.

As another embodiment of the present invention, a spring constant adjusting slit may be provided in at least one of the conductive thin plate springs.
According to the present embodiment, it is possible to obtain a movable contact piece that can easily meet customer demands, is easy to design, and has a high degree of freedom.

As another embodiment of the present invention, the intermediate portions of the conductive thin plate springs may be provided with curved portions having different sizes and overlapping shapes.
According to the present embodiment, even if both ends of the movable contact piece are fixed and integrated, the movable contact piece having smooth operation characteristics can be obtained by the curved portion absorbing and relieving the strain accompanying elastic deformation. .

Another embodiment of the present invention, the free end side of the conductive thin plate springs stacked, may be previously arranged a pair of the movable contact in the width direction.
According to this embodiment, since it becomes a twin contact structure, a movable contact piece with high contact reliability is obtained.

The electromagnetic relay according to the present invention is configured to include a contact mechanism portion having any one of the above-described movable contact pieces in order to achieve the above-described problem.

According to the present invention, the pair of elastic return tongues that come into contact with the card at the time of return are cut and raised at the free end of the conductive thin leaf spring located on the outward face side, so that only the tensile force is applied to the movable contact piece. In addition, since a torsional moment also acts, even if contact welding occurs, an electromagnetic relay can be obtained that can easily open the movable contact and consumes less power.
In addition, since the driving elastic tongue piece and the return elastic tongue piece are cut out from the free ends of different conductive thin plate springs, there is an effect that the number of parts and assembly man-hours are small and a highly productive electromagnetic relay can be obtained. .

FIG. A is an overall perspective view of an electromagnetic relay to which the first embodiment according to the present invention is applied, and FIG. B is a perspective view showing a state where a cover is removed from the first embodiment of FIG. FIGS. A and B are plan views showing before and after operation. It is a disassembled perspective view of 1st Embodiment shown in FIG. 1A. It is the disassembled perspective view seen from the angle different from FIG. It is a perspective view of the box-shaped base shown in FIG. 1B. It is a principal part disassembled perspective view of 1st Embodiment shown in FIG. 1B. FIGS. A, B and C are a front view, a bottom view and a rear view of the contact mechanism shown in FIG. FIGS. A and B are a plan view and a cross-sectional view of the card shown in FIG. FIGS. A and B are a partially enlarged perspective view and a bottom view of the drive mechanism shown in FIG. FIGS. A and B are a front view and a rear view showing a contact mechanism part of a second embodiment according to the present invention. FIGS. A and B are a bottom view of the contact mechanism shown in FIG. 10 and a perspective view of a third conductive thin plate spring.

An electromagnetic relay which is an embodiment to which the present invention is applied will be described with reference to the accompanying drawings of FIGS.
The electromagnetic relay according to the first embodiment includes a box-shaped base 10, an electromagnet block 20, a rotating block 30, a card 40, a contact mechanism 50, a support plate 70, and a cover 80. .

As shown in FIG. 5, the box-shaped base 10 has a planar rectangular shallow box shape, and the inside thereof is partitioned by an insulating wall 11 having an operation cutout portion 11 a, and a first recess 12. And a second recess 13 is formed. Further, the box-shaped base 10 has a shallow groove 14a extending vertically along the outer surface thereof, and a latch receiving portion 14b protruding from the bottom surface of the shallow groove 14a.
The first recess 12 is provided with a bearing portion 16 for supporting a rotation shaft portion 34a of the rotation block 30 described later on the bottom surface thereof, and is opposed to the bearing portion 16 therebetween. Positioning recesses 17a and 17b for positioning an electromagnet block 20 to be described later are provided at the positions. Further, a notch step portion 18 for positioning a spool 21 of an electromagnet block 20 described later is provided at the opening edge portion of the first recess 12.
Furthermore, terminal grooves 15a and 15b for assembling a fixed contact terminal 51 and a movable contact terminal 54 of a contact mechanism section 50, which will be described later, are formed at the opening edge of the second recess 13.

As shown in FIG. 6, the electromagnet block 20 has a coil 23 wound around a spool 21 having flanges 22a and 22b at both ends, and an iron core 24 is inserted into a through hole 22c provided in the spool 21, The yokes 25 and 27 are caulked and fixed to both projecting ends. The yokes 25 and 27 are formed by bending plate-like magnetic materials having wide portions 26 and 28 each punched into a substantially T shape into an L- shaped cross section. Then, a pair of coil terminals 29, 29 are appropriately press-fitted into a plurality of terminal holes provided in the flange portion 22a of the spool 21, and lead wires of the coil 23 are respectively tangled to the coil terminals 29, 29 and soldered. It is.
In addition, by arranging a total of five terminal holes in the collar portion 22a, the number of coil terminals 29 and the press-fitting position can be appropriately selected according to customer needs and specifications. In addition, the coil terminal 29 does not have to be a simple bar shape, and may have a substantially T shape, for example, if necessary.

  The rotating block 30 has a rotating block body 33 formed by sandwiching a permanent magnet (not shown) between a pair of plate-shaped movable iron pieces 31 and 32 and insert molding. The rotating block body 33 has rotating shaft portions 34 a and 34 b projecting on the same upper axis on the upper and lower surfaces facing each other, and a driving arm portion 35 is integrally formed on the side surface of the rotating block body 33. Molded. The driving arm portion 35 has an engaging claw portion 36 formed at the tip thereof.

  As shown in FIG. 8, the card 40 has a drive hole 41 on one end side and an engagement hole 42 on the other end side. Further, driving protrusions 43 and 44 project from the adjacent corners on the one end side in opposite directions, have a substantially planar T shape, and have a full-safe protrusion 45 at the edge of the driving hole 41. Is protruding. Of the drive protrusions 43, 44, one drive protrusion 43 is larger in thickness than the other drive protrusion 44, and has a shape in which a movable contact piece 60 described later cannot abut simultaneously. .

As shown in FIGS. 6 and 7, the contact mechanism unit 50 includes a fixed contact terminal 51 and a movable contact terminal 54. In FIG. 7, for convenience of explanation, the distal end portions of the return elastic tongue pieces 67 b and 67 c provided at the free end portion of the second conductive thin plate spring 65 are shown in a partially cut away state.
A pair of fixed contacts 52 and 53 are fixed to the fixed contact terminal 51 in the width direction at one end thereof.
On the other hand, the movable contact terminal 54 has the movable contact piece 60 fixed by caulking at one end thereof, and an operation hole 55 is provided at the lower end thereof. The movable contact piece 60 has a structure in which three first, second, and third conductive thin plate springs 61, 65, 67 are sequentially stacked, and a pair of movable contacts 56, 57 are provided at the free ends thereof. They are integrated by caulking in the width direction.

The first conductive thin plate spring 61 has a spring constant adjusting slit 62a extending from one end portion to which the caulking is fixed toward the free end portion, and absorbs and alleviates expansion and contraction when rotating in the middle portion. In order to ensure smooth operation characteristics, a substantially U- shaped curved portion 63a is provided. The first conductive thin plate spring 61 has its free end divided into three in the width direction, a driving elastic tongue 64a is formed at the center thereof, and reinforcing elastic tongues 64b and 64c are formed on both sides thereof. It is provided.

  The second conductive thin leaf spring 65 has a spring constant adjusting slit 62b extending from one end portion to which the caulking is fixed toward the free end portion, and absorbs and relaxes expansion and contraction when it rotates in the middle portion. In order to ensure smooth operation characteristics, a substantially U-shaped curved portion 63b is provided. Further, the second conductive thin plate spring 65 is formed with an engagement notch 66a at the center of the free end thereof, and the inner edge of the engagement notch 66a is opposed to raise the position. Elastic tongue pieces 66b and 66c are formed.

  The third conductive thin plate spring 67 is provided with a substantially U-shaped curved portion 63c in the middle portion thereof to absorb and relieve expansion and contraction when rotating, and to ensure smooth operation characteristics. In addition, the third conductive thin plate spring 67 is obtained by dividing the free end portion of which the center portion is notched into three in the width direction and bending it in the same direction, whereby the position restricting elastic tongue piece 67a and the return elastic member 67a. Tongue pieces 67b and 67c are formed.

The spring constant can be changed by appropriately adjusting the width and length dimensions of the spring constant adjusting slits 62a and 62b provided in the first and second conductive thin plate springs 61 and 65, respectively. For this reason, it is easy to adjust the spring load at the time of operation and return, and there is an advantage that the degree of freedom of design is large.

As shown in FIG. 3, the support plate 70 is bridged with its both ends locked to the opening edge of the box-shaped base 10. The support plate 70 is fitted with a rotation shaft portion 34b of the rotation block 30 in a bearing hole 71 provided in the center thereof, and positioning rectangular holes 72, 72 provided on both sides of the bearing hole 71. By fitting the other end portions 26b and 28b of the wide portions 26 and 28 of the yokes 25 and 27 respectively, the electromagnet block 20 and the rotating block 30 can be positioned with high assembly accuracy.

  The cover 80 has a planar rectangular shape that can cover the opening of the box-shaped base 10, and an elastic locking portion 81 extends downward from each side of the outer peripheral edge.

The procedure for assembling the electromagnetic relay will be described.
First, as shown in FIGS. 3 and 5, one end of the wide portions 26 and 28 of the yokes 25 and 27 is formed in the positioning recesses 17 a and 17 b provided on the bottom surface of the first recess 12 of the box-shaped base 10. 26a and 28a are fitted and positioned. Further, positioning is performed by fitting the flange portion 22 a of the spool 21 to the notch step portion 18 of the box-shaped base 10. In this embodiment, since the electromagnet block 20 is positioned at a plurality of locations on the box-shaped base 10, there is an advantage that assembly accuracy is high. Then, the fixed contact terminal 51 is press-fitted into the terminal groove 15a of the second recess 13 and positioned.

On the other hand, as shown in FIGS. 3 and 9, the card 40 is inserted into the operation hole 55 of the movable contact terminal 54, and the card 40 is assembled to the movable contact piece 60 that is caulked and fixed to the movable contact terminal 54. For convenience of explanation, the movable contact terminal 54 is not shown in FIG.
That is, as shown in FIG. 9, the elastic tongue piece 64a for driving the first conductive thin plate spring 61 is inserted into the drive hole 41 of the card 40, and the elastic tongue piece for position regulation of the second conductive thin plate spring 65 is inserted. 66b, 66c engages both sides of the card 40 to restrict (hold) the position. Then, the elastic tongue 67a for position restriction of the third conductive thin plate spring 67 is locked to one end of the card 40, and the elastic tongues 67b and 67c for return are driven protrusions 43 and 44 of the card 40. Are engaged with each other to regulate the position in the vertical direction. Further, the engaging claw portion 36 of the rotating block 30 is engaged with the engaging hole 42 of the card 40 and inserted into the box-shaped base 10 as it is. And the said card | curd 40 is inserted in the notch 11a for operation of the insulating wall 11 of the said box-shaped base 10, and the said movable contact terminal 54 is press-fitted and positioned in the said terminal groove 15b. Next, the rotation shaft portion 34a of the rotation block 30 is fitted into the bearing hole 16 of the box-shaped base 10, and the rotation block 30 is rotatably supported.

Further, both ends of the support plate 70 are engaged and bridged to the opening edge of the box-shaped base 10, and the rotation shaft portion 34 b of the rotation block 30 is fitted into the bearing hole 71 and the positioning square is fitted. The other ends 26b and 28b of the wide portions 26 and 28 of the yokes 25 and 27 are fitted and positioned in the holes 72 and 72, respectively. For this reason, the electromagnet block 20 and the rotation block 30 are positioned with high positional accuracy on the box-shaped base 10, and there is an advantage that there is no variation in operating characteristics.
Finally, the cover 80 is positioned so as to cover the opening of the box-shaped base 10, and the elastic locking portion 81 of the cover 80 is locked to the locking receiving portion 14b of the box-shaped base 10, Assembly work is completed.

Next, the operation of this embodiment will be described.
As shown in FIG. 2A, the rotating block 30 is configured such that one end portion 32 a of the movable iron piece 32 is attracted to the wide portion 26 of the yoke 25 by the magnetic force of a permanent magnet (not shown), and The other end 31 b is adsorbed to the wide portion 28 of the yoke 27. For this reason, the movable contact piece 60 is pulled in the direction of the movable contact terminal 54 against the spring force via the card 40. As a result, the movable contacts 56 and 57 are separated from the fixed contacts 52 and 53, respectively. For convenience of explanation, the support plate 70 is not shown in FIGS. 2A and 2B.

  The coil 23 is excited by applying a voltage so that a magnetic force in a direction to cancel the magnetic force of the permanent magnet of the electromagnet block 20 is generated. As a result, one end 31 a of the movable iron piece 31 of the rotating block 30 is attracted to the wide portion 26 of the yoke 25 and the movable iron piece 32 of the rotating block 30 is attracted to the wide portion 28 of the yoke 27. The other end 32b is sucked and the turning block 30 is turned. For this reason, the driving arm portion 35 presses the card 40, and further, the spring force of the movable contact piece 60 acts on the card 40 via the driving elastic tongue 64a. Slide in the direction you head. As a result, the movable contact piece 60 moves in a direction away from the movable contact terminal 54 by its spring force, and the movable contacts 56 and 57 abut against the fixed contacts 52 and 53, respectively. Next, one end 31 a of the movable iron piece 31 of the rotating block 30 is attracted to the wide portion 26 of the yoke 25, and the other end 32 b of the movable iron piece 32 is attracted to the wide portion 28 of the yoke 27. For this reason, even if the application of the voltage to the coil 23 is stopped, the position of the card 40 is fixed, and the movable contacts 56 and 57 and the fixed contacts 52 and 53 are kept in contact with each other. In this state, the distance between the drive protrusion 43 and the return elastic tongue 67b is smaller than the distance between the drive protrusion 44 and the return elastic tongue 67c.

Next, when a voltage in the opposite direction to that described above is applied to the coil 23, one end portion 32 a of the movable iron piece 32 is attracted to the wide portion 26 of the yoke 25, and the other end portion 31 b of the movable iron piece 31 is attracted to the width of the yoke 27. Sucked into the wide portion 28. For this reason, the rotation block 30 rotates in the opposite direction, the card 40 is pulled by the engaging claw portion 36 of the rotation block 30, and the card 40 slides in a direction to be separated from the fixed contact terminal 51. At this time, after the driving projection 43 contacts the return elastic tongue 67b of the third conductive thin plate spring 67, the drive protrusion 44 contacts the return elastic tongue 67c. That is, a process of shifting from the state where the movable contacts 56, 57 and the fixed contacts 52, 53 are in contact with each other to the state where the movable contacts 56, 57 and the fixed contacts 52, 53 are separated from each other. , The card 40 is temporarily brought into contact with the movable contact piece 60, and not only a tensile force but also a torsional moment acts on the third conductive thin plate spring 67. As a result, after the movable contact 56 is separated from the fixed contact 52, the movable contact 57 is separated from the fixed contact 53.
Therefore, even if contact welding occurs, there is an advantage that the movable contacts 56 and 57 can be easily separated from the fixed contacts 52 and 53.

As shown in FIGS. 10 and 11, the second embodiment is substantially the same as the first embodiment described above, except that the driving protrusions 43 and 44 of the T- shaped card 40 have the same shape. And the bending angle of the pair of return elastic tongues 67b and 67c provided at the tip edge of the third conductive thin plate spring 67 is different (FIG. 11B).
Therefore, even when the driving projection 44 of the card 40 comes into contact with the return elastic tongue 67c of the third conductive thin plate spring 67 during the return shown in FIGS. The driving protrusion 43 is not in contact with the return elastic tongue 67 b of the third conductive thin plate spring 67.

  As in the first embodiment, when the electromagnet block 20 is excited to rotate the rotating block 30 and the card 40 is slid, the operation of the second embodiment is performed via the first conductive thin plate spring 61. Thus, the movable contacts 56 and 57 are in contact with the fixed contacts 52 and 53 simultaneously.

  Next, when a reverse voltage is applied to the coil 23 of the electromagnet block 20, the rotating block 30 rotates in the reverse direction, and the card 40 is reversed via the engaging claw 36 of the rotating block 30. Slide in the direction. For this reason, after the driving protrusion 43 of the card 40 abuts on the return elastic tongue 67c of the third conductive thin plate spring 67, the drive protrusion 44 returns to the return elastic elasticity of the third conductive thin plate spring 67. A torsional moment is applied to the entire movable contact piece 60 by contacting the tongue piece 67b. For this reason, the card 40 comes into contact with the movable contact piece 60, and not only a tensile force but also a torsional moment acts on the third conductive thin plate spring 67. As a result, after the movable contact 57 is separated from the fixed contact 53, the movable contact 56 is separated from the fixed contact 52. As a result, even if contact welding occurs, there is an advantage that the movable contacts 56 and 57 can be easily separated from the fixed contacts 52 and 53.

  Of course, the movable contact piece and the contact mechanism according to the present invention are not limited to the above-described electromagnetic relay but may be applied to other electromagnetic switches.

10: Box-shaped base 11: Insulating wall 11a: Notch for operation 12: First recess 13: Second recess 15a, 15b: Terminal groove 16: Bearing portion 17a, 17b: Positioning recess 18: Notch step portion 20: Electromagnet block 21: Spool 22a, 22b: collar part 23: coil 24: iron core 25, 27: yoke 26, 28: wide part 29: coil terminal 30: rotating block 31, 32: movable iron piece 33: times Moving block body 34a, 34b: Rotating shaft portion 35: Driving arm portion 36: Engaging claw portion 40: Card 41: Driving hole 42: Engaging hole 43, 44: Driving projection 45: Full safe projection 50: Contact mechanism 51: Fixed contact terminal 52, 53: Fixed contact 54: Movable contact terminal 55: Operation hole 56, 57: Movable contact 60: Movable contact piece 61: First conductive thin plate springs 62a, 6 b: Slit for adjusting spring constant 63a, 63b, 63c: Curved portion 64a: Elastic tongue for driving 64b, 64c: Elastic tongue for reinforcement 65: Second conductive thin plate springs 66b, 66c: Elastic tongue for position regulation 67 : Third conductive thin plate spring 67a: elastic tongue for position regulation 67b, 67c: elastic tongue for return 70: support plate 71: bearing hole 72: rectangular hole for positioning 80: cover 81: elastic locking portion

Claims (6)

At least two conductive thin plate springs are stacked and one end is fixed and integrated with the movable contact terminal, while the movable contact is fixed and integrated on the free end side, and the card is engaged with the free end. A movable contact piece for moving the movable contact to and away from the fixed contact by rotating and driving in a direction;
A driving elastic tongue that engages with the card is provided at the free end of one conductive thin plate spring, and the movable contact and the fixed contact are in contact with the free end of the other conductive thin plate spring. A movable contact piece provided with a pair of return elastic tongue pieces that come into contact with the card in the process of shifting from the state to the separated state.   An elastic tongue for position regulation that engages and regulates both sides of the card is provided at the free end of the conductive thin plate spring located in the middle of the movable contact pieces made of three conductive thin plate springs. The movable contact piece according to claim 1.   The movable contact piece according to claim 1, wherein a spring constant adjusting slit is provided in at least one of the conductive thin plate springs.   4. The movable contact piece according to claim 1, wherein each of the intermediate portions of the conductive thin plate springs is provided with a curved portion having a shape that is sequentially different and overlapped.   5. The movable contact piece according to claim 1, wherein a pair of movable contacts are arranged in parallel in the width direction on the free end side of the stacked conductive thin plate springs.   An electromagnetic relay comprising the contact mechanism section according to any one of claims 1 to 5.

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