Multi-contact movable spring and electromagnetic relay

Abstract

A multi-contact movable spring strip includes a main body having two opposite faces, two opposite ends along a length direction, and opposite sides along a width direction, a portion of the main body adjacent to the first end being a base, the main body having at least one slit along its length to form at least two rocker members that are freely rockable relative to the base of the main body, a movable contact being fixed to one face of each rocker member adjacent to its free end, the free end of at least one rocker member having an extension extending away from the movable contact, and a connecting piece being fixed to at least one rocker member, the connecting piece including a piece and an elastic arm extending along the width direction of the main body of the movable spring strip, the elastic arm abutting against the remaining rocker members except for the rocker member to which the connecting piece is fixed, and the contact gap between the movable contact on the rocker member and the corresponding fixed contact is adjusted by adjusting the pressure applied by the elastic arm to the rocker member.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to Chinese patent applications bearing application numbers 202310192957.X, 202310192963.5, and 202320370442.X, filed on March 2, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the technical field of relays, and more particularly to multi-contact movable spring and electromagnetic relays. [Background technology]

[0003] A relay is an electronically controlled device that has a control system (also called the input circuit) and a controlled system (also called the output circuit). It is typically used in automatic control circuits. It is essentially an "automatic switch" that controls large currents with small currents, fulfilling the functions of automatic regulation, safety protection, and conversion circuits. Relays are sensitive to heat. Exceeding the allowable temperature accelerates the deterioration of the plastic and insulating materials inside the relay, resulting in problems such as oxidation and corrosion of contacts, difficulty in arc extinguishing, deterioration of the technical parameters of electrical components, and reduced reliability.

[0004] To increase contact resistance at low temperatures, a conventional relay with a multi-path contact structure includes a movable spring member including a movable contact, a movable spring sheath, and a movable spring lead. The movable spring sheath has a first end and a second end, with the first end connected to one end of the movable spring lead, and the second end fixedly connected to the movable contact. The movable spring sheath has two slits extending from the second end to the first end (the end connected to the movable spring lead), dividing the movable spring sheath into three current-carrying conductors. There are three movable contacts, each fixed to a corresponding current-carrying conductor, dividing the movable spring sheath into a three-path parallel structure. This structure, designed as a multi-group parallel contact structure, reduces the current flowing through each current-carrying conductor and reduces temperature rise.

[0005] To ensure a consistent gap between the contacts when the movable and fixed contacts are disconnected and to reduce fluctuations in the gap between the contacts due to distortion of the pusher card, the conventional movable spring element has a connecting piece on the surface facing the fixed contact, which is connected between each of the movable contacts. This configuration completely fixes the connecting piece and the three movable contacts. While this maintains a consistent gap between the contacts, it is not adjustable, which means that it cannot meet the requirements under certain conditions. Therefore, a solution to maintain a consistent gap between the contacts while also adjusting the gap as needed is urgently needed. Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the present disclosure is to overcome the drawbacks of the prior art and to provide a multi-contact movable spring piece and electromagnetic relay in which, by improving the structure, the elastic arms of the connecting piece abut against the adjacent oscillating member, the gap between the contacts can be maintained constant when the elastic arms are not applying pressure to the oscillating member, and the contact gap between the movable contact on the oscillating member and the corresponding fixed contact can be adjusted by adjusting the force applied by the elastic arms to the oscillating member. [Means for solving the problem]

[0007] According to one aspect of the present disclosure, there is provided a multi-contact movable spring piece including a main body, the main body having opposite first and second surfaces, opposite first and second ends along its length, and opposite sides along its width, a portion of the main body adjacent to the first end being a base, the main body being provided with at least one slit, the slit extending from the base toward the second end of the main body, whereby the main body forms at least two rocking members that are freely rockable relative to the base, and a movable contact is fixed to the first or second surface of each of the rocking members at a position adjacent to the free end of the rocking member, the at least two An extension extending in a direction away from the movable contact is provided at the free end of one of the rocking members, and the extension is used for engaging with the card slot of the push card. A connecting piece is fixed to one of the at least two rocking members, and the connecting piece includes a piece and an elastic arm extending along the width direction of the main body of the movable spring piece. The elastic arm abuts against the remaining rocking members excluding the rocking member to which the connecting piece is fixed. By adjusting the pressure value applied by the elastic arm to the rocking member, the contact gap between the movable contact on the rocking member and the corresponding fixed contact is adjusted.

[0008] According to one embodiment of the present disclosure, there are an odd number of the oscillating members, the extension portion is provided on the most central oscillating member among the plurality of the oscillating members, and the connecting piece has two of the elastic arms, each of which abuts against the oscillating members on both sides.

[0009] According to one embodiment of the present disclosure, flange structures are provided on both sides of the extension portion, so as to reduce the generation of chips due to friction between the movable spring piece and the push card by utilizing the flange structures.

[0010] According to one embodiment of the present disclosure, the connecting piece has a piece fixed to a surface of the swinging member on which the extension portion is provided.

[0011] According to one embodiment of the present disclosure, the connecting piece has a section extending from a base of the main body toward the second end of the main body until it is flush with the extension.

[0012] According to one embodiment of the present disclosure, the end of each of the connecting pieces is provided with a limiting bend portion.

[0013] According to an embodiment of the present disclosure, a bent portion is provided on one side of the connecting piece, and the bent portion is located between the movable contact and the limiting bent portion.

[0014] According to one embodiment of the present disclosure, the elastic arm of the connection piece has at least a pair of V-shaped portions that open in opposite directions, and the V-shaped portions have a trapezoidal planar shape after being unfolded.

[0015] According to one embodiment of the present disclosure, the main body is constructed by stacking a plurality of spring pieces, the oscillating member is constructed by stacking a plurality of spring pieces, the flange structure is provided on one of the outer spring pieces, the flange structures on both sides are bent toward the adjacent spring pieces, and escape structures are provided on both sides of the adjacent spring pieces.

[0016] According to one embodiment of the present disclosure, the movable contact of the oscillating member to which the connecting piece is fixed and the movable contact of the other oscillating member are arranged offset in the longitudinal direction of the main body, the movable contact of the oscillating member to which the connecting piece is fixed is larger than the movable contact of the other oscillating member, and the width of the oscillating member to which the connecting piece is fixed is larger than the width of the other oscillating member.

[0017] According to one embodiment of the present disclosure, there are two oscillating members, one of the oscillating members is provided with the extension portion, the connecting piece has one of the elastic arms, and the elastic arm extends toward the other oscillating member and abuts against the other oscillating member.

[0018] According to another aspect of the present disclosure, an electromagnetic relay includes a multi-contact movable leaf spring as described herein.

[0019] Compared with the prior art, the beneficial effects of the present disclosure are as follows:

[0020] 1. In the present disclosure, one of the rocker members is provided with an extension for engaging with a card slot of a push card, and a connecting piece is fixed to one of the rocker members, with the elastic arm of the connecting piece abutting against the adjacent rocker member. In this structure, when a push card rocks one of the rocker members, the other rocker members move in tandem, preventing inconsistencies in the contact gaps caused by the push card being pushed obliquely. This ensures that the contact gaps are uniform. Furthermore, the pressure applied by the elastic arm to the rocker member can be adjusted as needed to adjust the contact gaps between the movable contacts on the rocker members and the corresponding fixed contacts. This means that the contact gaps can be adjusted to be inconsistent according to actual needs. At the same time, in actual use, after the movable contact and the fixed contact are disconnected, it is only necessary to measure the contact gap (minimum gap) between the movable contact on the oscillating member to which the connecting piece is fixed and the corresponding fixed contact, and there is no need to measure the contact gap between the movable contact on the oscillating member to which the connecting piece is not fixed and the corresponding fixed contact, which further simplifies the process control points.

[0021] 2. In the present disclosure, flange structures are provided on both sides of the extension, and in this structure, the flange structures of the movable spring contact the push card, reducing friction between the movable spring and the push card when the movable spring swings, thereby reducing the generation of chips.

[0022] 3. In the present disclosure, the connecting piece is extended so that it is flush with the end of the extension, and a limiting bend is provided at the end of the connecting piece. This structure of the present disclosure can prevent the push card from being removed.

[0023] 4. In the present disclosure, a bent portion is provided on one side of the connecting piece. This structure of the present disclosure reduces the rigidity of the connecting piece and prevents permanent deformation after long-term movement.

[0024] 5. In the present disclosure, the elastic arm of the connecting piece is provided with at least two V-shaped portions, the opening directions of the at least two V-shaped portions being opposite to each other, and the planar shape of each V-shaped portion after deployment being a trapezoid-like shape. With this structure of the present disclosure, the arc lines of the V-shaped portions of the elastic arm abut against the swinging member from their ends, reducing friction between the two. Furthermore, because the planar shape of the V-shaped portions after deployment is a trapezoid-like shape, deformation of the elastic arm occurs in a location close to the contact point with the swinging member, minimizing deformation at the base of the elastic arm and enabling more reliable pressure application.

[0025] 6. In the present disclosure, the movable contacts on the rocker member to which the connecting piece is fixed and the movable contacts on the remaining rocker members among at least two of the rocker members are alternately arranged in the longitudinal direction of the movable spring piece, and the movable contacts on the rocker member to which the connecting piece is fixed are larger than the movable contacts on the remaining rocker members, and the width of the rocker member to which the connecting piece is fixed is larger than the width of the remaining rocker members. In this structure of the present disclosure, the rocker member to which the connecting piece is fixed has the widest width and the largest movable contact, so the largest current flows. Furthermore, because of its wide width, it is less likely to deform, and deformation of the rocker member to which the connecting piece is fixed is also small. In applications where the gaps between the contacts are uneven, the gap difference between the contact gaps can be more reliably controlled. At the same time, the elastic arms of the connecting pieces press the remaining rocker pieces, causing these rocker pieces to move away from the rocker piece to which the connecting piece is fixed. Therefore, the contact gap between the movable contact on the rocker member to which the connecting piece is fixed and the corresponding fixed contact is smaller than the contact gap between the movable contact on the remaining rocker pieces and the corresponding fixed contact. When the multiple movable contacts and fixed contacts are disconnected in the closed state, the movable contacts on the remaining rocker pieces and their corresponding fixed contacts are separated first, and then the movable contacts on the rocker piece to which the connecting piece is fixed and their corresponding fixed contacts are separated. In this way, when the multiple movable contacts and fixed contacts are instantly disconnected, an arc is generated only between the movable contacts on the rocker piece to which the connecting piece is fixed and the fixed contact, and no arc is generated between the movable contacts on the remaining rocker pieces and the fixed contacts, which reduces resistance heating and is advantageous for suppressing temperature rise and extending the lifespan of the relay.

[0026] The object of the present disclosure is to overcome the drawbacks of the prior art and provide a multi-contact movable spring piece and electromagnetic relay that, by improving the structure, can adjust the difference in gap between the intermediate contact and the two contacts by adjusting the difference in engagement height between the two ends of the connecting piece and the two contacts on both sides while maintaining a constant contact gap by extending both sides of the connecting piece and elastically pressing the two rocking pieces on both sides.

[0027] The technical means of the present disclosure for solving the above problem includes a movable spring piece body, the movable spring piece body having at least one slit extending upward from its base, thereby forming at least two oscillating members that can oscillate freely relative to the base, and a multi-contact movable spring piece having movable contacts fixed to one surface of the free ends of the oscillating members, one of the oscillating members having an extension extending upward from the connection point of the movable contact for engaging with a card slot of a push card, and one connecting piece being fixedly connected to the movable contact of one of the oscillating members, the connecting piece extending laterally and elastically pressing against an adjacent oscillating member, and adjusting the difference in height between the oscillating member to which the connecting piece is fixed and the adjacent oscillating member, thereby adjusting the difference in gap between the contact of one of the oscillating members and the adjacent contact.

[0028] According to one embodiment of the present disclosure, there are an odd number of the oscillating members, and the extension portion is provided on the central oscillating member among the oscillating members, and both sides of the connecting piece are extended to two sides respectively to elastically press the oscillating members on the two sides, thereby adjusting the difference in height between the central oscillating member and the oscillating members on both sides, thereby adjusting the difference in gap between the intermediate contact and the contacts on both sides.

[0029] According to one embodiment of the present disclosure, a flange structure is provided on each side of the extension portion of one of the oscillating members, and by utilizing the flange structure, the generation of chips due to friction between the movable spring piece and the push card is reduced.

[0030] According to one embodiment of the present disclosure, the connection piece is fixed to one surface of one of the rocking members.

[0031] According to one embodiment of the present disclosure, the connecting piece extends upwardly to be flush with the extension portion and has a limiting bend at its end.

[0032] According to one embodiment of the present disclosure, the connecting piece is provided with a U-shaped bent portion between the connecting point with the intermediate movable contact and the distal end.

[0033] According to one embodiment of the present disclosure, the connecting piece has at least one double V-shaped bent portion at an engaging portion with an adjacent rocker member, and the two V-shaped bent portions in each double V-shaped bent portion of the at least one double V-shaped bent portion are arranged in opposite directions, and the V-shaped bent portion closest to the rocker member elastically presses the corresponding rocker member. The developed surface of the double V-shaped bent portion is arranged in a trapezoidal shape.

[0034] According to one embodiment of the present disclosure, the movable spring piece body is formed by stacking a plurality of spring pieces, and the flange structure is provided on one first spring near the outside of one side corresponding to the free end of the oscillating member, and the flange structures on both sides are bent toward the second spring, and relief structures are provided on both sides of the second spring.

[0035] According to one embodiment of the present disclosure, the movable contact of one of the rocking members is positioned offset from the movable contact of an adjacent rocking member, the movable contact of one rocking member is larger than the movable contact of the adjacent rocking member, and the width of the spring piece of one of the rocking members is larger than the width of the spring piece of the adjacent rocking member.

[0036] The electromagnetic relay of the present disclosure includes the multi-contact movable spring leaf described in this disclosure as above.

[0037] Compared with the prior art, the beneficial effects of the present disclosure are as follows:

[0038] 1. In the present disclosure, one of the rocker members has an extension extending upward from the movable contact connection point for engaging with the card slot of a push card, and a connecting piece is fixedly connected to the movable contact of one of the rocker members, extending laterally to elastically press the adjacent rocker member. This structure of the present disclosure allows the other rocker members to move in conjunction with the push card when the push card rocks one rocker member, preventing gap differences caused by the push card being pushed obliquely. Furthermore, by adjusting the height difference between the rocker member to which the connecting piece is fixed and the adjacent rocker member, the gap difference between the contact of one rocker member and the adjacent contact can be adjusted, thereby maintaining a constant contact gap while adjusting the gap difference according to actual needs.

[0039] 2. In the present disclosure, flange structures are provided on both sides of the extension of one of the swing members. This structure of the present disclosure utilizes the bending of the flange structures of the movable spring piece to contact the push card, thereby reducing friction between the movable spring piece and the push card when the movable spring piece swings, and reducing the generation of chips.

[0040] 3. In the present disclosure, the connecting piece extends upward so as to be flush with the extension part, and a limiting bend part is provided at the end of the connecting piece. This structure of the present disclosure positions the push card and prevents it from being removed.

[0041] 4. In the present disclosure, the connecting piece has a U-shaped bent portion between the connecting point with the intermediate movable contact and the end. This structure of the present disclosure reduces the rigidity of the connecting piece, prevents permanent deformation due to long-term movement, and ensures that the gap difference is maintained.

[0042] 5. In the present disclosure, the connecting piece has at least one double V-shaped bent portion at the engagement portion with the adjacent oscillating member, and the two V-shaped bends in each double V-shaped bent portion of the at least one double V-shaped bent portion are arranged in opposite directions, the V-shaped bend closest to the oscillating member elastically presses against the corresponding oscillating member, and the developed surface of the double V-shaped bend is arranged in a trapezoidal shape. This structure of the present disclosure allows the contact point to be a line contact of arcuate surfaces, reducing friction between the two and making the contact point more stable. Furthermore, by setting the developed surface of the V-shaped bent portion to a trapezoidal shape, it is ensured that deformation occurs at the contact position, reducing root deformation and more reliably transmitting displacement of the intermediate contact.

[0043] 6. In the present disclosure, the movable contact of one of the oscillating members is offset from the movable contact of an adjacent oscillating member, the movable contact of one oscillating member is larger than the movable contact of the adjacent oscillating member, and the width of the spring piece of one of the oscillating members is larger than the width of the spring piece of the adjacent oscillating member. This structure of the present disclosure ensures that the movable contact of one oscillating member is the largest, thereby ensuring the maximum current flow. In addition, because the large width makes it less likely to deform, the amount of deformation of one oscillating member is small, which indirectly minimizes the contact gap and prevents arc discharge during life from occurring at the large contact with the smallest gap, ensuring life reliability.

[0044] The object of the present disclosure is to overcome the drawbacks of the prior art and to provide a connection structure between a movable spring piece and a push card, and an electromagnetic relay, which, on the one hand, provides a flange structure on the first spring piece, thereby reducing the amount of scraping generated in the width direction of the movable spring piece and the push card when the movable spring piece oscillates, and, on the other hand, reduces the amount of scraping generated in the thickness direction of the movable spring piece and the push card when the movable spring piece oscillates by having only the first spring piece contact the push card.

[0045] The technical solution of the present disclosure to solve the above problem is a connection structure for a movable spring piece and a push card, the movable spring piece having at least one slit extending upward from its base, thereby forming at least two rocking members that can freely rock relative to the base, each rocking member having a movable contact fixed to one surface of its free end. Each rocking member has an extension extending upward from the connection point of the movable contact at its end, the push card has at least two card slots arranged side by side that penetrate the thickness direction, and the extension of each rocking member engages with a corresponding card slot. One of the rocking members has flange structures on both sides of the extension, and the distance between the flange structure of the extension of one rocking member and the corresponding slot wall of the card slot is smaller than the distance between the side of the extension of the adjacent rocking member and the corresponding slot wall of the card slot. This reduces the amount of chips that are generated in the width direction of the push card when the movable spring piece makes contact with the card slot by utilizing the bending of the flange structure of the movable spring piece and the movable spring piece swings.

[0046] According to one embodiment of the present disclosure, the number of the rocker members is odd, and the flange structure is provided on the most central rocker member among the rocker members.

[0047] According to one embodiment of the present disclosure, the sum of the distances between the flange structures on both sides of the extension portion of one rocking member and the corresponding slot wall of the corresponding slot is smaller than the distance between the side of the extension portion of an adjacent rocking member and the corresponding slot wall of the corresponding card slot.

[0048] According to one embodiment of the present disclosure, the movable spring is configured by stacking a plurality of spring pieces, and the flange structure is provided on one of the spring pieces.

[0049] According to one embodiment of the present disclosure, the flange structure is provided on one spring piece near the outside of one side corresponding to the free end of the oscillating member, and the flange structures on both sides are bent toward the second spring, and a relief structure is provided on each side of the second spring.

[0050] According to one embodiment of the present disclosure, a stepped portion is provided at a position adjacent to the extension portion of each spring piece of each swinging member, and the stepped portion of one spring piece is set higher, so that when the movable spring piece moves, only one spring piece contacts the push card in the thickness direction of the push card, thereby reducing scraps generated in the thickness direction of the push card when the movable spring piece swings.

[0051] According to one embodiment of the present disclosure, the movable spring piece is configured by stacking four spring pieces, wherein the first spring piece, the second spring piece, and the third spring piece each have an extension portion, and the fourth spring piece does not have an extension portion.

[0052] According to one embodiment of the present disclosure, the first, second, and third spring pieces of each of the swing members are each provided with a stepped portion at a position adjacent to the extension portion, and the stepped portion of the first spring piece is higher than the stepped portions of the second and third spring pieces, so that when the movable spring piece moves, only the first spring piece comes into contact with the push card in the thickness direction of the push card, thereby reducing chips generated in the thickness direction of the push card when the movable spring piece swings.

[0053] According to one embodiment of the present disclosure, the first spring piece, the second spring piece, and the third spring piece of each of the oscillating members are further bent into a U-shape between the movable contact connection point and the base, and the opening of the U-shaped portion faces the opposite side to the side to which the movable contact is connected.

[0054] The electromagnetic relay of the present disclosure includes the connection structure between the movable spring piece and the push card described in the above disclosure.

[0055] Compared with the prior art, the beneficial effects of the present disclosure are as follows:

[0056] 1. In the present disclosure, flange structures are provided on both sides of the extension of one of the rocking members, and the distance between the flange structure of the extension of one of the rocking members and the corresponding slot wall of the corresponding card slot is smaller than the distance between the side of the extension of the adjacent rocking member and the corresponding slot wall of the corresponding card slot. With this structure in the present disclosure, the bending of the flange structure of the movable spring piece is used to contact the push card, thereby reducing scrapes generated in the width direction of the push card when the movable spring piece swings.

[0057] 2. In the present disclosure, the first, second, and third spring pieces of the three swinging members each have a stepped portion at a position close to the extension of the main body, and the stepped portion of the first spring piece is higher than the stepped portions of the second and third spring pieces. With this structure of the present disclosure, when the movable spring piece operates, only the first spring piece can come into contact with the push card in the thickness direction of the push card, thereby reducing shavings generated in the thickness direction of the push card when the movable spring piece swings.

[0058] The objective of the present disclosure is to overcome the shortcomings of the prior art and provide a three-contact gap difference movable spring piece and electromagnetic relay that has ribs on the two rocking members on both sides and no rib in the center, thereby ensuring that the contact gap in the center is smaller than the contact gaps on both sides and ensuring the effect of the gap difference between the three contacts.

[0059] The technical means of the present disclosure for solving the above problem includes a movable spring piece body, the movable spring piece body being provided with at least one slit extending upward from the base, thereby forming at least two oscillating members that can oscillate freely relative to the base, a movable contact being fixed to one surface of the free end of each oscillating member, one of the at least two oscillating members being provided with an extension portion extending upward from the connection point of the movable contact for engaging with a card slot of a push card, and some of the at least two oscillating members being further provided with a rib between the connection point of the movable contact and the base, the rib being used to improve the rigidity of the oscillating member and ensure a gap difference between the movable contacts, resulting in a multi-contact gap difference movable spring.

[0060] According to one embodiment of the present disclosure, there is an odd number of the rocking members, and the extension portion is provided on the most central rocking member among the rocking members.

[0061] According to one embodiment of the present disclosure, flange structures are provided on both sides of the extension portion of one of the rocking members, and by utilizing the bending of the flange structures, the generation of chips due to friction between the movable spring and the push card is reduced.

[0062] According to one embodiment of the present disclosure, the rib has an elongated shape.

[0063] According to one embodiment of the present disclosure, the rib is located at the center of the width of the corresponding rocker member.

[0064] According to one embodiment of the present disclosure, the rib is formed by recessing one surface of the oscillating member and protruding the other surface, and protrudes in the direction opposite to the surface to which the movable contact is connected.

[0065] According to one embodiment of the present disclosure, a compression spring is further connected to one side of at least two of the rocking members away from the movable contacts, the roots of the compression spring are fixed to the respective movable contact fixing points of the rocking members, and the ends of the compression spring are branched into at least two pieces, each extending to a corresponding card slot of the push card.

[0066] According to one embodiment of the present disclosure, the movable spring piece body is constructed by stacking a plurality of spring pieces, the flange structure is provided on one first spring piece near the outside of one side corresponding to the free end of the oscillating member, the flange structures on both sides are bent toward the second spring piece, and a relief structure is provided on each side of the second spring piece.

[0067] According to one embodiment of the present disclosure, the movable contact of at least one of the rocking members is offset from the movable contact of an adjacent rocking member, and the movable contact of at least one of the rocking members is larger than the adjacent movable contact.

[0068] The electromagnetic relay of the present disclosure includes the multi-contact gap difference movable spring leaf described in the present disclosure as above.

[0069] Compared with the prior art, the beneficial effects of the present disclosure are as follows:

[0070] 1. In the present disclosure, one of the at least two rocker members has an extension extending upward from the connection point of the movable contact for engaging with the card slot of a push card, and some of the at least two rocker members have an additional rib between the connection point of the movable contact and its base, using the rib to improve the rigidity of the rocker member and ensure a gap difference between the movable contacts. This structure of the present disclosure allows the rib to improve the rigidity of some of the rocker members; the stronger the rigidity of the spring piece, the smaller the deformation amount and the larger the gap between the movable contact and the stationary contact. Ribs are provided on the movable spring pieces of some of the rocker members to improve their rigidity. Due to their high rigidity, the contact gap of some of the rocker members is larger than the contact gap of one of the rocker members during the same stroke, ensuring the effect of the gap difference between multiple contacts. By setting the gap difference between contacts, in actual use, only the minimum gap without the rib needs to be measured, and the contacts with the rib do not need to be measured, further simplifying process control.

[0071] 2. In the present disclosure, flange structures are provided on both sides of the extension of one of the swinging members, and the bending of the flange structures is utilized to reduce the generation of chips between the movable spring piece and the push card. With this structure of the present disclosure, the bending of the flange structure of the movable spring piece is utilized to contact the push card, thereby reducing friction between the movable spring and the push card when the movable spring swings, thereby reducing the generation of chips.

[0072] 3. In the present disclosure, a compression spring is further connected to one side of the three oscillating members away from the movable contacts, with the base of the compression spring fixed to the three movable contacts of the oscillating members respectively, and the ends of the compression spring branch into three pieces that extend to the corresponding card slots of the push card. This structure of the present disclosure does not require auxiliary positioning, reducing the number of parts and reducing costs. [Brief explanation of the drawings]

[0073] The above and other features and advantages of the present disclosure will become more apparent from the detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings. [Figure 1] 1 is a schematic diagram of the three-contact movable spring piece according to the first embodiment of the present disclosure; FIG. [Figure 2] FIG. 2 is a front view of an example of a three-contact movable spring piece according to the first embodiment of the present disclosure. [Figure 3] FIG. 2 is a side view of an example of a three-contact movable spring piece according to the first embodiment of the present disclosure. [Figure 4] FIG. 4 is an enlarged schematic view of A in FIG. [Figure 5] 1 is a schematic diagram of a three-contact movable spring piece according to a first embodiment of the present disclosure in a conducting state. FIG. [Figure 6] 1 is a schematic diagram illustrating a partial structure of an embodiment of an electromagnetic relay according to the present disclosure. [Figure 7] FIG. 10 is a schematic diagram of the three-dimensional structure of an example of a two-contact movable spring piece according to Example 2 of the present disclosure. [Figure 8] FIG. 10 is a top view of an example of a two-contact movable spring piece according to a second embodiment of the present disclosure. [Figure 9] FIG. 10 is a side view of an example of a two-contact movable spring piece according to a second embodiment of the present disclosure. [Figure 10] FIG. 10 is a schematic diagram of the three-dimensional structure of an embodiment of a five-contact movable spring piece according to the third embodiment of the present disclosure. [Figure 11] FIG. 10 is a top view of an example of a five-contact movable spring piece according to a third embodiment of the present disclosure. [Figure 12] FIG. 10 is a side view of an example of a five-contact movable spring piece according to a third embodiment of the present disclosure. [Figure 13] FIG. 10 is a front view showing a connection structure between a movable spring and a push card according to a fourth embodiment of the present disclosure. [Figure 14] FIG. 14 is an enlarged schematic view of B in FIG. [Figure 15] FIG. 10 is a side view showing a connection structure between a movable spring and a push card according to a fourth embodiment of the present disclosure. [Figure 16] FIG. 4 is an enlarged schematic view of C in FIG. [Figure 17] FIG. 10 is a schematic diagram illustrating a partial structure of an electromagnetic relay according to a fourth embodiment of the present disclosure. [Figure 18] FIG. 10 is a schematic diagram of a three-dimensional structure showing a connection structure between a movable spring and a push card according to a fifth embodiment of the present disclosure. [Figure 19] FIG. 10 is a front view showing a connection structure between a movable spring and a push card according to a fifth embodiment of the present disclosure. [Figure 20] FIG. 13 is a schematic diagram of a three-dimensional structure showing a connection structure between a movable spring and a push card according to a sixth embodiment of the present disclosure. [Figure 21] FIG. 13 is a front view showing a connection structure between a movable spring and a push card according to a sixth embodiment of the present disclosure. [Figure 22] FIG. 13 is a schematic diagram of the three-contact movable spring piece (ribs facing upward) according to the seventh embodiment of the present disclosure. [Figure 23] FIG. 13 is a front view of a three-contact movable spring piece according to a seventh embodiment of the present disclosure. [Figure 24] FIG. 13 is a top view of a three-contact movable spring piece according to a seventh embodiment of the present disclosure. [Figure 25] FIG. 13 is a schematic diagram of the three-contact movable spring piece (with the U-shaped portion facing upward) according to the seventh embodiment of the present disclosure. [Figure 26] FIG. 26 is an enlarged schematic view of D in FIG. 25. [Figure 27] FIG. 10 is a schematic diagram illustrating a partial structure of an electromagnetic relay according to a seventh embodiment of the present disclosure. [Figure 28] FIG. 13 is a schematic diagram of the three-dimensional structure of a two-contact movable spring piece according to Example 8 of the present disclosure (ribs facing upward). [Figure 29] FIG. 13 is a top view of a two-contact movable spring piece according to an eighth embodiment of the present disclosure. [Figure 30] FIG. 13 is a schematic diagram of the three-dimensional structure of a five-contact movable spring piece according to Example 9 of the present disclosure (ribs facing upward). [Figure 31] FIG. 13 is a top view of a five-contact movable spring piece according to a ninth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0074] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in various forms and should not be construed as limited to the embodiments described herein. Although relative terms such as "above" and "below" are used herein to describe the relative relationship of one component to another component shown in the drawings, these terms are used herein merely for convenience, e.g., based on the orientation of the example shown in the drawings. It is understood that if the device shown in the drawings is inverted and turned upside down, the component described "above" would become the component located "below." Other relative terms, such as "top" and "bottom," have similar meanings. When a structure is "above" another structure, it can mean that the structure is integrally formed on the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via the other structure.

[0075] The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements / components / etc. The terms "comprise" and "have" are open-ended and mean that other elements / components / etc. may be present in addition to the listed elements / components / etc. The terms "first," "second," etc. are used as indicative terms only and do not limit the number of their objects.

[0076] Example 1 The multi-contact movable spring of the present disclosure includes a body, an extension, and a connecting piece. The body has opposite first and second surfaces, opposite first and second ends along its length, and opposite sides along its width. The portion of the body adjacent to the first end is a root. The body has at least one slit extending from the root to the second end, such that the body forms at least two rocker members that can freely rock relative to the root, and a movable contact is fixed to the first or second surface of each of the rocker members at a position adjacent to the free end of the rocker member.

[0077] An extension is fixed to a free end of one of the at least two rocker members, the extension extending from the free end of the rocker member in a direction away from the movable contact, and the extension is used for engaging a push card with a card slot.

[0078] A connecting piece is fixed to one of the at least two oscillating members, and the connecting piece includes a piece and an elastic arm extending along the width direction of the main body of the movable spring piece, and the elastic arm abuts against the remaining oscillating members excluding the oscillating member to which the connecting piece is fixed, and by adjusting the pressure value applied by the elastic arm to the oscillating member, the contact gap between the movable contact on the oscillating member and the corresponding fixed contact is adjusted.

[0079] 1 to 5, a first embodiment of the multi-contact movable spring piece of the present disclosure is a three-contact movable spring piece. The three-contact movable spring piece of the first embodiment includes a main body 1a, an extension 121a, and a connecting piece 4a. The main body 1a has opposite first and second surfaces, opposite first and second ends along its length, and opposite sides along its width. The portion of the main body 1a adjacent to the first end is a base 10a.

[0080] The main body 1a has two slits extending from the base 10a toward the second end of the main body 1a, thereby forming three swing members 11a, 12a, and 13a that can swing freely relative to the base 10a. Movable contacts 31a, 32a, and 33a are fixed to first surfaces of the three swing members that are close to the free ends, respectively.

[0081] The extension 121a is fixed to the free end of the rocking member 12a, which is located in the center of the three rocking members, and extends from the free end of the rocking member 12a in a direction away from the movable contact 32a. The extension 121a is used to engage with the card slot of the push card 2a (see FIG. 6).

[0082] The connecting piece 4a is fixed to the central rocker 12a. In one embodiment, the connecting piece 4a can be fixed simultaneously with the movable contact 32a, i.e., the fixing point of the connecting piece 4a on the rocker 12a is the same as the fixing point of the movable contact 32a on the rocker 12a. In one embodiment, flange structures 122a are provided on both sides of the extension 121a, respectively, and the use of the flange structures 122a reduces the generation of chips due to friction between the movable spring and the push card 2a.

[0083] The connecting piece 4a includes a piece 40a and a resilient arm 47a, and the resilient arm 47a extends from one side of the piece 40a along the width direction W of the movable spring body 1a. In the first embodiment, the connecting piece 4a has two resilient arms 47a that extend in opposite directions and abut against the oscillating members 11a and 13a, respectively. The pressure of the two resilient arms 47a allows the two oscillating members 11a and 13a to move a certain distance s relative to the oscillating member 12a. Therefore, by adjusting the pressure that the two resilient arms 47a apply to the two oscillating members 11a and 13a, the contact gap between the movable contacts 32a of the oscillating members 11a and 13a and the corresponding fixed contacts can be adjusted to be larger than the contact gap between the movable contacts 32a of the oscillating member 12a and the corresponding fixed contacts. That is, the contact gap between the movable contact 32a of the oscillating member 12a and the corresponding fixed contact and the contact gap between the movable contacts 31a, 33a of the oscillating members 11a, 13a and the corresponding fixed contact form a certain gap difference h (see FIG. 12).

[0084] Each elastic arm 47a of the connecting piece 4a has a pair of V-shaped portions 43a, 44a, the opening directions of which are opposite to each other, and the two V-shaped portions 44a of the two elastic arms 47a that are away from the half body 40a abut against the swinging portions 11a, 13a, respectively. The developed planar shape of the V-shaped portions 43a, 44a is similar to a trapezoid.

[0085] In this embodiment, the connecting piece 4a is fixed to a first surface of the central rocking member 12a. In other embodiments, the connecting piece 4a can be fixed to a second surface of the central rocking member 12a. The half 40a of the connecting piece 4a is flush with the end of the extension 121a, and the end of the half 40a is provided with a bend 41a, and the half 40a has a bend 42a between the limiting bend 41a and the movable contact 32a.

[0086] In this embodiment, a compression coil spring 5a is further connected to one side of each of the three oscillating members 11a, 12a, 13a that is away from the movable contacts 31a, 32a, 33a. The base of the compression coil spring 5a is fixed to the fixed positions of the three movable contacts 31a, 32a, 33a of the oscillating members, respectively, and the ends of the compression coil spring 5a are branched into three pieces that each extend to the corresponding card slot of the push card 2a.

[0087] In this embodiment, the main body 1a is formed by stacking a plurality of spring pieces, and the corresponding rocker members are also formed by stacking a plurality of spring pieces. The flange structure 122a is disposed on the first spring piece 14a outside the rocker member 12a, and both sides of the flange structure 122a are bent toward the second spring piece 15a, and the second spring piece 15a has relief structures 151a at corresponding positions.

[0088] In this embodiment, the main body 1a is configured by stacking four spring pieces, and the first spring piece 14a, the second spring piece 15a, and the third spring piece 16a are each provided with a corresponding extension portion, while the fourth spring piece 17a is not provided with an extension portion. The first spring 14a, the second spring 15a, and the third spring 16a of the three oscillating members further have a U-shaped portion 18a between the movable contacts 31a, 32a, and 33a and the base portion 10a, and the opening of the U-shaped portion 18a faces away from the side of the main body having the movable contacts 31a, 32a, and 33a.

[0089] In this embodiment, of the three oscillating members, the movable contact 32a of the central oscillating member 12a and the movable contacts 31a and 33a of the oscillating members 11a and 13a on both sides are arranged offset in the longitudinal direction of the main body 1a, the movable contact 32a of the oscillating member 12a is larger than the movable contacts 31a and 33a of the oscillating members 11a and 13a, and the width of the oscillating member 12a is larger than the width of the oscillating members 11a and 13a.

[0090] As shown in FIG. 6, the electromagnetic relay of the present disclosure includes the aforementioned three-contact movable spring piece, fixed spring 61a, fixed contact 62a, magnetic circuit unit 7a, armature assembly 8a, and movable spring lead piece 9a. The first armature, second armature, and magnet of the armature assembly 8a are combined into an I-shaped integrated member via a plastic member. The yoke of the magnetic circuit unit 7a is engaged with openings on both sides of the I-shaped structure of the armature assembly 8a. The fixed contact 62a is fixed to one end of the fixed spring 61a, and the other end of the fixed spring 61a typically extends outside the relay housing as a lead piece. One end of the three-contact movable spring piece is fixed to the movable contacts 31a, 32a, and 33a, and the other end of the three-contact movable spring piece is fixed to one end of the movable spring lead piece 9a, and the other end of the movable spring lead piece 9a also extends outside the relay housing as a lead piece. The movable contacts 31a, 32a, and 33a are positioned to engage with the fixed contact 62a. The armature assembly 8a engages with one end of the push card 2a via a plastic push arm 81a, and the other end of the push card 2a engages with the movable spring piece.

[0091] In the multi-contact movable spring piece and electromagnetic relay disclosed herein, one of the rocker members has an extension 121a at its free end for engaging with a card slot of a push card. A connecting piece 4a is also fixedly connected to the movable contact of the rocker member. The connecting piece 4a has a body and a resilient arm extending laterally from the body, which abuts against the remaining rocker members. In this structure disclosed herein, when a push card presses one of the rocker members, the other rocker members are moved in tandem through the push card, preventing mismatches in the contact gaps between the movable contacts and the corresponding fixed contacts due to oblique pressing of the push card. Furthermore, by adjusting the pressure applied to the rocker members by the resilient arm of the connecting piece, the contact gaps between the movable contacts of each rocker member and the corresponding fixed contacts can be adjusted to suit specific applications.

[0092] In the multi-contact movable spring element and electromagnetic relay of the present disclosure, flange structures 122a are provided on both sides of the extension portion 121a of the swinging member. This structure of the present disclosure utilizes the flange structures 122a of the movable spring to contact the push card 2a, thereby reducing friction between the movable spring and the push card during swinging and reducing scrap generation.

[0093] In the multi-contact movable spring piece and electromagnetic relay of the present disclosure, the piece 40a of the connection sheet 4a is flush with the extension 121a, and the end of the piece 40a is provided with a bend 41a. This structure of the present disclosure positions the push card 2a and prevents the push card 2a from falling off.

[0094] In the multi-contact movable spring piece and electromagnetic relay of the present disclosure, a bent portion 42a is provided in the piece 40a of the connection sheet 4a at a position between the movable contact 32a and the bend 41a. This structure of the present disclosure reduces the rigidity of the connection sheet 4a, making it possible to prevent permanent deformation due to long-term movement.

[0095] In the multi-contact movable spring piece and electromagnetic relay of the present disclosure, the elastic arm 47a of the connecting piece 4a has two V-shaped portions 43a, 44a that open in opposite directions, and the outer V-shaped portion 44a abuts against the corresponding oscillating portion. The planar shape of each V-shaped portion after deployment is trapezoidal. This structure of the present disclosure allows the V-shaped portion to make line contact with the oscillating portion on its arcuate surface, reducing friction between the elastic arm 47a and the oscillating portion. Furthermore, because the planar shape of the V-shaped portion after deployment is trapezoidal, the deformation position of the elastic arm is close to the contact position with the oscillating portion, minimizing deformation of the base of the elastic arm and ensuring more reliable pressure application.

[0096] In the multi-contact movable spring piece and electromagnetic relay disclosed herein, the movable contacts of the oscillating part to which the connecting piece is fixed and the movable contacts of the other oscillating members are alternately arranged along the length of the movable spring body, the movable contact of the oscillating member to which the connecting piece is fixed is larger than the movable contacts of the other oscillating members, and the width of the oscillating member to which the connecting piece is fixed is wider than the width of the other oscillating members. In this structure disclosed herein, the movable contact of the oscillating member to which the connecting piece is fixed is the largest, thereby ensuring the maximum current flow. Furthermore, because its width is large and less prone to deformation, the amount of deformation of the oscillating member to which the connecting piece is fixed is small. In applications where the gaps between the contacts are uneven, this improves the reliability of gap difference control between the contact gaps. At the same time, the elastic arm of the connecting piece presses the remaining oscillating members, moving them away from the oscillating member to which the connecting piece is fixed. Therefore, the contact gap between the movable contact on the oscillating member to which the connecting piece is fixed and the corresponding fixed contact is smaller than the contact gap between the movable contact on the oscillating member to which the connecting piece is fixed and the corresponding fixed contact. When multiple movable contacts and fixed contacts are disconnected simultaneously, the movable contacts on the remaining oscillating members are first separated from their corresponding fixed contacts, followed by the movable contacts on the oscillating members to which the connecting pieces are fixed, and then the movable contacts on the oscillating members to which the connecting pieces are fixed are separated from their corresponding fixed contacts. In this way, when multiple movable contacts and fixed contacts are disconnected simultaneously, an arc occurs only between the movable contacts on the oscillating members to which the connecting pieces are fixed and the fixed contacts, and no arc occurs between the movable contacts on the remaining oscillating members and the fixed contacts. This is beneficial to reducing the rise in resistance temperature, thereby reducing the rise in relay temperature and extending the service life.

[0097] Example 2 As shown in FIGS. 7 to 9, Example 2 of the multi-contact movable spring piece of the present disclosure differs from Example 1 in that the movable spring piece is a two-contact movable spring piece. A slit is formed in the main body 1a, forming two oscillating members 11a and 12a on the main body 1a of the movable spring piece, which are freely oscillating relative to their bases. Movable contacts, i.e., movable contacts 31a and 32a, are fixed to the first surfaces of the oscillating members adjacent to their free ends. In other embodiments, the movable contacts may be provided on the second surfaces of the oscillating members. The free end of the oscillating member 12a is provided with an extension 121a for engaging with the card slot of the push card 2a. Furthermore, a connecting piece 4a is fixedly connected to the movable contact 32a of the oscillating member 12a. The connecting piece 4a includes a piece 40a and a resilient arm 47a. The resilient arm 47a extends toward the oscillating member 11a and abuts against the oscillating member 11a. The movable contact 32a of the oscillating member 12a and the movable contact 31a of the oscillating member 11a are arranged offset in the longitudinal direction of the movable spring piece 1a, the movable contact 32a of the oscillating member 12a is larger than the movable contact 3a of the oscillating member 11a, and the width of the oscillating member 12a is larger than the width of the oscillating member 11a.

[0098] The other configurations of the second embodiment are basically the same as those of the first embodiment, and therefore will not be repeated here.

[0099] Example 3 As shown in FIGS. 10 to 12, the multi-contact movable spring piece and electromagnetic relay of the present disclosure differ from Example 1 in that the movable spring piece is a five-contact movable spring piece. Four slits are formed in the main body 1a, thereby forming five oscillating members 11a, 12a, 13a, 19a, and 20a that can freely oscillate relative to the base. Movable contacts, i.e., movable contacts 31a, 32a, 33a, 34a, and 35a, are fixed to a first surface adjacent to the free end of each oscillating member. The oscillating member 12a is located at the center of the multiple oscillating members. The free end of the oscillating member 12a is provided with an extension 121a for engaging with the card slot of the push card 2a. A connecting piece 4a is further fixedly connected to the movable contact 32a of the oscillating member 12a. The connecting piece 4a has a piece 40a and two elastic arms 47a extending on both sides from the piece 40a. Each resilient arm 47a has two pairs of V-shaped portions, each pair having two V-shaped portions with opening directions opposite to each other, and as shown in Fig. 12a, the V-shaped portions of each resilient arm 47a are designated 43a, 44a, 45a, and 46a, respectively. The movable contact 32a on the rocker member 12a is shifted from the movable contacts 31a, 33a, 34a, and 35a on the other four rocker members in the longitudinal direction of the main body 1a, and the movable contact 32a on the rocker member 12a is larger than the movable contacts 31a, 33a, 34a, and 35a on the other four rocker members, and the width of the rocker member 12a is larger than the widths of the rocker members 11a, 13a, 19a, and 20a.

[0100] The other configurations of the third embodiment are basically the same as those of the first embodiment, and therefore will not be repeated here.

[0101] The above is merely a preferred embodiment of the present disclosure and does not limit the present disclosure in any way. Although the present disclosure is disclosed as a preferred embodiment as described above, it does not limit the present disclosure. Those skilled in the art can make various possible changes and modifications to the technical solutions of the present disclosure, or convert them into equivalent embodiments, using the technical content disclosed above, without departing from the scope of the technical solution of the present disclosure. Therefore, based on the essence of the disclosed technology, simple modifications, equivalent changes, and modifications made to the above embodiments without departing from the content of the disclosed technical solutions should be included in the protection scope of the technical solutions of the present disclosure.

[0102] A magnetic hold relay generally comprises a magnetic circuit system, a contact system, a push mechanism, and a base. The magnetic circuit system generally comprises two symmetrical magnetic circuits, each including a fixed magnetic conductive part, a movable magnetic conductive part, and a coil. The contact system includes a movable spring part and a fixed spring part, and the push mechanism mainly comprises a push card. When a forward pulse voltage is applied to the relay coil, the magnetic circuit system operates, causing the push card to push the movable spring part, bringing the movable contact of the movable spring part into contact with the fixed contact of the fixed spring part, thereby operating the relay. When a reverse pulse voltage is applied to the coil, the magnetic circuit system operates, causing the push card to push the movable spring part, separating the movable contact of the movable spring part from the fixed contact of the fixed spring part, thereby resetting the relay. Push cards are components that connect plastic and metal, and slide relative to the metal component, so sliding friction can easily generate plastic shavings. Furthermore, with existing technology, the push card makes edge contact with the metal component in the direction of movement, and there is no design to prevent shavings, so the resulting plastic shavings are highly likely to cause contact discontinuities.

[0103] The present disclosure further provides a connection structure between a movable spring and a push card, and an electromagnetic relay. By providing flange structures on both sides of the extension portion of one of the swing members, it is possible to reduce scraping that occurs in the width direction of the push card and the main body of the movable spring when the movable spring swings.

[0104] According to one aspect of the present disclosure, in a connection structure between a movable spring piece and a push card, the movable spring piece comprises a main body portion, the main body having a first end and a second end facing each other along its length direction and two opposing side surfaces along its width direction, the portion of the main body adjacent to the first end is a base, at least one slit is opened in the main body, the slit extends from the base of the main body toward the second end, the main body forms at least two swinging members that can swing freely relative to the base, and one surface of each of the swinging members is provided with a self-adjusting portion for adjusting the swinging member's position. a movable contact fixed at a position adjacent to the free end of each of the swing members, an extension extending in a direction away from the movable contact, the push card having at least two slots arranged side by side through the thickness direction, the extension of each of the swing members engaged with a corresponding slot, and one of the extensions of the swing members having flange structures on both sides, the distance between the flange structures and the corresponding slot wall of the slot being shorter than the distance between the side of the extension without the flange structure and the corresponding slot wall of the corresponding slot, thereby reducing scraping generated by the movable spring and the push card in the width direction of the body of the movable spring when the movable spring swings by utilizing the flange structures to contact the slots.

[0105] According to one embodiment of the present disclosure, the flange structure is an arc surface.

[0106] According to one embodiment of the present disclosure, the number of the rocker members is odd, and the flange structure is provided on the extension of the central rocker member among the plurality of rocker members.

[0107] According to one embodiment of the present disclosure, the sum of the distances between the flange structures on both sides of the extension and the corresponding slot walls of the corresponding slots is smaller than the distance between either side of an extension without a flange structure and the corresponding slot wall of the corresponding slot.

[0108] According to one embodiment of the present disclosure, the movable spring is configured by stacking a plurality of spring pieces, the oscillating member is configured by stacking a plurality of spring pieces, the extension portion is configured by stacking a plurality of spring pieces, and the flange structure is provided on one of the spring pieces.

[0109] According to one embodiment of the present disclosure, the flange structure is provided on one of the spring pieces closest to the outside, and the flange structures on both sides are bent toward the adjacent spring pieces, and a relief structure is provided on each side of the adjacent spring pieces.

[0110] According to one embodiment of the present disclosure, each spring piece of each swinging member is provided with a stepped portion extending along the length of the body at a position adjacent to the extension portion, and the stepped portion of one of the spring pieces is relatively long, so that when the movable spring piece operates, only the spring piece having the stepped portion that is long in the thickness direction of the push card comes into contact with the push card, thereby reducing shavings generated in the thickness direction of the push card when the movable spring piece swings.

[0111] According to one embodiment of the present disclosure, the length of the stepped portion of the outer spring piece is relatively long.

[0112] According to one embodiment of the present disclosure, the movable spring piece includes a first spring piece, a second spring piece, a third spring piece, and a fourth spring piece stacked in sequence, and the first spring piece, the second spring piece, and the third spring piece each have an extension portion, and the fourth spring piece does not have an extension portion.

[0113] According to one embodiment of the present disclosure, the first spring piece, the second spring piece, and the third spring piece of each of the oscillating members are each provided with a stepped portion extending along the length of the main body at a position close to the extension portion, and the stepped portion of the first spring piece is longer than the stepped portions of the second spring piece and the third spring piece, so that when the movable spring piece operates, only the first spring piece comes into contact with the push card in the thickness direction of the push card, thereby reducing shavings generated in the thickness direction of the push card when the movable spring piece oscillates.

[0114] According to one embodiment of the present disclosure, the first spring piece, the second spring piece, and the third spring piece of each of the oscillating members have a U-shaped portion between the movable contact and the base, and the opening of the U-shaped portion faces opposite to the one side of the main body having the movable contact.

[0115] According to another aspect of the present disclosure, an electromagnetic relay includes the connection structure of the movable spring and the push card described herein.

[0116] Compared with the prior art, the beneficial effects of the present disclosure are as follows:

[0117] 1. In the present disclosure, flange structures are provided on both sides of the extension of one of the swinging members, and the distance between the flange structures and the corresponding slot wall of the corresponding card slot is smaller than the distance between both sides of the extension without flange structures and the corresponding slot wall of the corresponding card slot. This structure of the present disclosure utilizes the flange structure of the movable spring to contact the push card, thereby reducing scrapes generated between the movable spring and the push card in the width direction of the movable spring body when the movable spring swings.

[0118] 2. Furthermore, in the present disclosure, the first, second, and third spring pieces of the swinging member are each provided with a stepped portion at a position close to the extension, and the stepped portion of the first spring is higher than the stepped portions of the second and third springs. With this structure of the present disclosure, when the movable spring piece operates, only the first spring piece comes into contact with the push card in the thickness direction of the push card, reducing the amount of shavings generated in the thickness direction of the movable spring piece and the push card when the movable spring piece swings.

[0119] The present disclosure will be described in more detail below with reference to the accompanying drawings and embodiments, but the connection structure between the movable spring piece and the push card, as well as the electromagnetic relay of the present disclosure, are not limited to these examples.

[0120] Example 4 In the connection structure between a movable spring piece and a push card of the present disclosure, the movable spring piece includes a main body, an extension, and a connection piece. The main body has opposite sides along its width direction. The portion of the main body adjacent to the first end is a root. At least one slit is provided in the main body, and the slit extends from the root toward the second end of the main body, thereby forming at least two rocker members that can freely rock relative to the root. A movable contact is fixed on one surface of each of the rocker members at a position adjacent to the free end of the rocker member. The free end of each of the rocker members has an extension extending in a direction away from the movable contact.

[0121] The push card has at least two card slots arranged side by side and penetrating through the thickness thereof, and the extensions of the swing members are engaged with the corresponding card slots, respectively.

[0122] One of the swing members has a flange structure on each side of its extension, and the distance between the flange structure and the corresponding slot wall of the slot is smaller than the distance between the side of the extension without the flange structure and the corresponding slot wall of the slot, thereby utilizing the flange structure to contact the slot and reducing chips generated by the swing member and the push card in the width direction of the body when the swing member swings.

[0123] 13 to 16, in this embodiment, there are three oscillating members and the movable spring is a three-contact movable spring. In other embodiments, the number of oscillating members may be any other odd number.

[0124] The movable spring body 1b has two slits extending upward from its base, forming three oscillating members 11b, 12b, and 13b (see FIG. 20) that can freely oscillate relative to the base. A movable contact 3b is fixed to one surface of each oscillating member near its free end. The free ends of the three oscillating members each have extensions 111b, 121b, and 131b that extend away from the movable contact 3b. The push card 2b has three slots 21b, 22b, and 23b that run parallel to the thickness direction T. The extensions 111b, 121b, and 131b of the three oscillating members are engaged with the corresponding slots 21b, 22b, and 23b, respectively. The thickness direction T of the push card 2b coincides with the length direction L of the movable spring body 1b. Of the three swing members, the central swing member 12b has an extension 121b provided with flange structures 1211b on both sides thereof, and the distance between the flange structures 1211b and the corresponding slot walls of the corresponding slots 22b is smaller than the distance between the opposite sides of the extensions 111b and 131b of the swing members 11b and 13b on both sides thereof and the corresponding slot walls of the corresponding slots 21b and 23b. This allows the flange structures 1211b of the movable spring to come into contact with the push card 2b, reducing chips generated in the width direction W with the push card 2b when the movable spring swings.

[0125] In this embodiment, the sum of the distances between the flange structures 1211b on both sides of the extension 121b of the central rocker 12b and the slot walls of the corresponding slot 22b is smaller than the distances between the side edges of the extensions 111b and 131b of the rocker members 11b and 13b on both sides and the slot walls of the corresponding slot 21b and 23b. Specifically, the distance between the flange structures 1211b on both sides of the extension 121b of the rocker 12b and the slot walls of the corresponding slot 22b is 0.1 mm, and the distances between the side edges of the extensions 111b and 131b of the rocker members 11b and 13b on both sides and the slot walls of the corresponding slot 21b and 23b are 0.3 mm.

[0126] In this embodiment, the movable spring is constructed by stacking multiple spring pieces, the flange structure 1211b is provided on the outer first spring piece 14b, the flange structures 1211b on both sides are each bent toward the second spring piece 15b, and escape structures 1212b are provided on both sides of the second spring piece 15b.

[0127] In this embodiment, the movable spring is constructed by stacking four springs, and the first spring 14b, the second spring 15b, and the third spring 16b each have an extension portion, while the fourth spring 17b does not have an extension portion.

[0128] In this embodiment, as shown in Fig. 16b, the first spring piece 14b, the second spring piece 15b, and the third spring piece 16b of the three swinging members are provided with stepped portions 141b, 151b, and 161b, respectively, at positions close to the extension portions and extending along the length direction L of the main body 1. The stepped portion 141b of the first spring piece 14b is longer than the stepped portions 151b of the second spring piece 15b and the stepped portions 161b of the third spring piece 16b. As a result, when the movable spring piece operates, only the first spring piece 14b comes into contact with the push card 2b in the thickness direction T (see Fig. 15). This reduces the amount of chips generated by the movable spring piece and the push card 2b in the thickness direction T when the movable spring piece swings.

[0129] In this embodiment, the first spring piece 14b, the second spring piece 15b, and the third spring piece 16b of the three oscillating members have a U-shaped portion 18b, which is located between the movable contact 3b and the base of each spring piece, and the opening of the U-shaped portion 18b faces opposite to the side having the movable contact of the spring piece 14b.

[0130] As shown in FIG. 17, the electromagnetic relay of the present disclosure includes the above-described connection structure between the movable spring piece and the push card, a fixed spring 51b, a fixed contact 52b, a movable spring lead piece 4b, a magnetic circuit unit 6b, and an armature assembly 7b. The first armature, the second armature, and the magnet of the armature assembly 7b are combined into an I-shaped integrated member via a plastic member. The yoke 61b of the magnetic circuit unit 6b is engaged with the openings on both sides of the I-shaped structure of the armature assembly 7b. The fixed contact 52b is fixed to one end of the fixed spring 51b, and the other end of the fixed spring 51b typically extends outside the relay housing as a lead piece. One end of the movable spring piece is fixed to the movable contact 3b, and the other end of the movable spring piece is fixed to one end of the movable spring lead piece 4b. The other end of the movable spring lead piece 4b also extends outside the relay housing as a lead piece. The movable contact 3b and the fixed contact 52b are in the engaged position. The armature assembly 7b is engaged with one end of the push card 2b via the plastic push arm 71b, and the other end of the push card 2b is engaged with the movable spring piece.

[0131] In the connection structure between the movable spring piece and the push card and the electromagnetic relay of the present disclosure, a flange structure 1211b is provided on each side of the extension of one of the swing members, and the distance between the flange structure 1211b and the corresponding slot wall of the corresponding card slot is smaller than the distance between the side of the extension without the flange structure and the corresponding slot wall of the corresponding card slot. This structure of the present disclosure uses the flange structure of the movable spring piece to contact the push card, thereby reducing the amount of scraping generated by the movable spring and the push card in the width direction W of the movable spring body when the movable spring piece swings.

[0132] In the connection structure between a movable spring piece and a push card and the electromagnetic relay of the present disclosure, the first spring piece 14b, the second spring piece 15b, and the third spring piece 16b of the three oscillating members are provided with stepped portions 141b, 151b, and 161b, respectively, at positions adjacent to the extension portions, and the stepped portion 141b of the first spring piece 14b is longer than the stepped portion 151b of the second spring piece 15b and the stepped portion 161b of the third spring piece 16b. With this structure of the present disclosure, when the movable spring piece operates, only the first spring piece 14b can come into contact with the push card 2b in the thickness direction T of the push card 2b, thereby reducing shavings generated by the movable spring and the push card in the thickness direction T when the movable spring oscillates.

[0133] Example 5 18 and 19, in the connection structure between a movable spring and a push card and the electromagnetic relay of the present disclosure, the movable spring is a two-contact movable spring, a slit is provided in the movable spring main body 1b, the main body 1b forms two swing members 11b, 12b that can swing freely relative to its base, and extensions 111b, 121b are provided at the free ends of the two swing members, respectively, which differ from Example 4. The push card 2b has two card slots 21b, 22b that penetrate in the thickness direction T and are arranged side by side, the extensions 111b, 121b of the two swing members engage with the corresponding card slots 21b, 22b, respectively, and flange structures 121b are provided on both sides of the extension 121b of the swing member 12b.

[0134] Example 6 20-21, in the movable spring and push card connection structure and electromagnetic relay of the present disclosure, the movable spring is a five-contact movable spring, and four slits are opened in the movable spring main body 1b. As a result, the main body 1b is formed with five swinging parts 11b, 12b, 13b, 19b, and 20b that can swing freely relative to the base, which is different from Example 4. The free ends of the five swinging parts are provided with extension parts 111b, 121b, 131b, 191b, and 201b, respectively. The push card 2b has five slots 21b, 22b, 23b, 24b, and 25b that run parallel to the thickness direction T. The extensions 111b, 121b, 131b, 191b, and 201b of the five oscillating members are engaged with the corresponding slots 21b, 22b, 23b, 24b, and 25b, respectively. The extension 121b of the oscillating member 12b has flange structures 1211b on both sides.

[0135] In addition, in conventional high-current magnetically held relays and contact assemblies thereof, at least one reinforcing rib is formed at the second end of the movable spring. This reinforcing rib can be formed on the first spring piece or can be laminated on the first and second spring pieces, or on the first, second and third spring pieces, to strengthen the rigidity of the second end. The reinforcing rib is located between the movable contact and the push card, and its length direction coincides with the length direction of the movable spring. The second end of the movable spring is provided with an outward cut-type slit along its length, which separates the two movable contacts at the second end of the movable spring.

[0136] In this structure, the stiffening ribs can increase the rigidity of the spring pieces, but in order to make the flexibility of each movable spring piece uniform, a stiffening rib is provided on each movable spring.When the push card is pulled down to cut, multiple movable contacts and corresponding fixed contacts are cut at the same time, which cannot meet the usage requirements in certain situations.

[0137] The present disclosure further provides a multi-contact movable spring element and electromagnetic relay in which some of the oscillating members are provided with ribs and some of the oscillating members are not, thereby improving the rigidity of the oscillating members by utilizing the ribs and realizing sequential disconnection between the multiple movable contacts and the corresponding fixed contacts when disconnected.

[0138] According to one aspect of the present disclosure, a multi-contact movable spring piece includes a main body having a first end and a second end opposite to each other along its length and opposite sides along its width, the portion of the main body adjacent to the first end being a base, the main body having at least one slit extending from the base toward the second end, the main body forming at least two rocker members that are freely rockable relative to the base, and a movable contact fixed to a first or second surface of each of the rocker members adjacent to the free end of the rocker member. The free end of one of the at least two rocker members has an extension extending away from the movable contact, the extension being used to engage with a card slot of a push card. Some of the at least two rocker members have a rib between the movable contact and the base, which improves the rigidity of the rocker member and enables sequential disconnection of the multiple movable contacts and corresponding fixed contacts when disconnected.

[0139] According to one embodiment of the present disclosure, the number of rocking members is odd, and the extension portion is provided on the central rocking member among the plurality of rocking members.

[0140] According to one embodiment of the present disclosure, the rib is not provided on the rocking member provided with the extension portion, and the rib is provided on the rocking member not provided with the extension portion.

[0141] According to one embodiment of the present disclosure, flange structures are provided on both sides of the extension, and by utilizing the flange structures, scrapings generated by friction between the movable spring and the push card are reduced.

[0142] According to one embodiment of the present disclosure, the rib has an elongated shape.

[0143] According to an embodiment of the present disclosure, the rib is disposed at the center of the swinging member in the width direction.

[0144] According to one embodiment of the present disclosure, the rib is recessed from one surface of the oscillating member on which the movable contact is provided toward the other surface and protrudes from the other surface.

[0145] According to one embodiment of the present disclosure, a compression spring is further connected to one side of at least two of the rocking members away from the movable contacts, the roots of the compression springs are fixed to the respective fixed positions of the movable contacts of the rocking members, and the ends of the compression springs are branched into at least two pieces, each of which can extend to a corresponding card slot of the push card.

[0146] According to one embodiment of the present disclosure, the main body is constructed by stacking a plurality of spring pieces, the flange structure is provided on a first spring piece that is closer to the outside of the plurality of spring pieces, both sides of the flange structure are bent toward the adjacent spring piece, and each side of the bent spring piece is provided with a relief structure.

[0147] According to one embodiment of the present disclosure, the movable contacts of the oscillating member provided with the extension portion and the movable contacts of the other oscillating members are arranged alternately in the longitudinal direction of the body, and the movable contacts of the oscillating member provided with the extension portion are larger than the movable contacts of the other oscillating members.

[0148] According to another aspect of the present disclosure, an electromagnetic relay includes a multi-contact movable leaf spring as described herein.

[0149] Compared with the prior art, the beneficial effects of the present disclosure are as follows:

[0150] 1. In the present disclosure, the free end of one of at least two rocker members is provided with an extension for engaging with a card slot of a push card, and some rocker members further have ribs between the movable contact and the base. The ribs can improve the rigidity of some rocker members; the stronger the rigidity of the spring piece, the smaller the deformation amount. Some other rocker members are not provided with ribs, so the present disclosure includes rocker members with different rigidities. In this structure of the present disclosure, during the disconnection process between each movable contact and its corresponding fixed contact from a closed state to an open state, the rocker member with the ribs has higher rigidity, resulting in a faster disconnection speed and a larger contact gap between the movable contact and its corresponding fixed contact after disconnection. On the other hand, the rocker member without the ribs has relatively lower rigidity, resulting in a slower disconnection speed and a smaller contact gap between the movable contact and its corresponding fixed contact after disconnection. Therefore, the present disclosure can achieve sequential disconnection, with the contact gap between each movable contact and its corresponding fixed contact being different after disconnection. Therefore, in actual use, it is only necessary to measure the contact gap (minimum gap) between the movable contact on the oscillating member without ribs and the corresponding fixed contact, and there is no need to measure the contact gap between the movable contact on the oscillating member with ribs and the corresponding fixed contact, which further simplifies the process control points.

[0151] 2. The oscillating member with an extension does not have a rib and has relatively low rigidity. The oscillating member without an extension has a rib and has relatively high rigidity. If a break occurs when the multiple movable contacts and fixed contacts are closed, the movable contact of the oscillating member with a rib separates from the corresponding fixed contact first, and the movable contact of the oscillating member without ribs separates from the corresponding fixed contact last. In this way, when the multiple movable contacts and fixed contacts are instantly separated, an arc occurs only between the movable contact and the fixed contact of the oscillating member without ribs, and no arc occurs between the movable contact and the fixed contact of the oscillating member with ribs. This reduces resistance heating, which is advantageous for suppressing temperature rise and extending the relay's lifespan.

[0152] 3. In the present disclosure, a flange structure is provided on each side of the extension, and the flange structure is used to reduce the generation of chips due to friction between the movable spring and the push card. This structure of the present disclosure uses the flange structure of the movable spring to contact the push card, thereby reducing friction between the movable spring and the push card when the movable spring swings, and reducing the generation of chips.

[0153] 4. In the present disclosure, an additional compression spring is connected to one side of each of the three rocker members away from the movable contacts, with the base of the compression spring fixed to each of the three movable contact fixing points of the rocker member, and the ends of the compression spring branch into three pieces, each of which extends to a corresponding card slot of the push card. This structure of the present disclosure does not require auxiliary positioning, reducing the number of parts and reducing costs.

[0154] The present disclosure will be described in more detail below with reference to the accompanying drawings and embodiments, but the multi-contact movable spring piece and electromagnetic relay of the present disclosure are not limited to these embodiments.

[0155] Example 7 The multi-contact movable spring piece of the present disclosure includes a main body. The main body has opposite sides along its width direction. A portion of the main body adjacent to a first end is a root. The main body has at least one slit extending from the root toward a second end of the main body, thereby forming at least two rocking members that are freely rockable relative to the root. A movable contact is fixed to a position adjacent to a free end of each of the rocking members. One of the at least two rocking members has an extension at its free end that extends away from the movable contact, the extension being used to engage with a card slot of a push card. Some of the at least two rocking members have a rib between the movable contact and the root. The rib improves the rigidity of the rocking member, enabling sequential disconnection between the multiple movable contacts and corresponding fixed contacts during disconnection.

[0156] 22 to 26, in this embodiment, the number of the oscillating members is an odd number, and the movable spring is a three-contact movable spring. In other embodiments, the number of the oscillating members may be another odd number.

[0157] The movable spring is a three-contact movable spring including a main body 1c. Two slits are formed in the main body 1c, and the main body 1c forms three oscillating members 11c, 12c, and 13c that can freely oscillate relative to a base. A movable contact is fixed to one surface of the free end of each oscillating member. The free end of the central oscillating member 12c of the three oscillating members is provided with an extension 121c that extends in a direction away from the movable contact 32c. The extension 121c is used to engage with the card slot of the push card 2c. The two oscillating members 11c, 13c on both sides are provided with ribs between the movable contacts and the base, and ribs 18c are used to improve the rigidity of the oscillating members 11c, 13c on both sides, making them greater in rigidity than the oscillating member 12c located in the middle. Thus, when cutting, the movable contacts 31c, 33c on the oscillating members 11c, 13c are first cut off from the corresponding fixed contacts, and then the movable contact 32c on the oscillating member 12c is cut off from the corresponding fixed contact, so that after cutting is completed, the contact gap between the movable contacts 31c, 33c and the corresponding fixed contacts is larger than the contact gap between the movable contact 32c and the corresponding fixed contact.

[0158] In this embodiment, flange structures 141c are provided on both sides of the extension portion 121c, and by using the flange structures, it is possible to reduce the generation of chips due to friction between the movable spring 1c and the push card 2c.

[0159] In this embodiment, the rib 18c has an elongated shape.

[0160] In this embodiment, the two ribs 18c are disposed at the center in the width direction W of the swinging members 11c and 13c, respectively.

[0161] In this embodiment, the rib 18c is a rib recessed from one surface of the oscillating members 11c, 13c having the movable contacts 31c, 33c toward the other surface not having the movable contacts 31c, 33c.

[0162] In this embodiment, a compression spring 4c is further connected to one side of the three oscillating members 11c, 12c, and 13c away from the movable contacts, and the base of the compression spring 4c is fixed to the three movable contacts 31c, 32c, and 33c of the oscillating members 11c, 12c, and 13c, respectively. The ends of the compression spring 4c are branched into three pieces, which can each extend to the corresponding card slot of the push card 2c.

[0163] In this embodiment, the main body 1c is constructed by stacking multiple spring pieces, and a flange structure 141c is provided on the outside of the first spring piece 14c, and both sides of the flange structure are bent toward the adjacent second spring piece 15c, and escape structures 151c are provided on both sides of the second spring piece 15c.

[0164] In this embodiment, the main body 1c is configured by stacking four springs: a first spring 14c, a second spring 15c, a third spring 16c, and a fourth spring 17c. The first spring piece 14c, the second spring piece 15c, and the third spring piece 16c are each provided with a corresponding extension, while the fourth spring piece 17c is not provided with an extension.

[0165] In this embodiment, the first spring piece 14c, the second spring piece 15c, and the third spring piece 16c of the three oscillating members are further bent into a U-shaped portion 19c between the movable contact and the base, and the opening of the U-shaped portion 19c faces away from the side of the spring piece having the movable contact. The rib 18c is provided on the fourth spring piece 17c.

[0166] In this embodiment, of the three oscillating members, the movable contact 32c of the central oscillating member 12c and the movable contacts 31c and 33c of the oscillating members 11c and 13c on both sides are arranged offset along the length L of the main body 1c, and the central movable contact 32c is larger than the movable contacts 31c and 33c on both sides.

[0167] As shown in FIG. 27, the electromagnetic relay of the present disclosure includes the multi-contact movable spring leaf, fixed spring 51c, fixed contact 52c, magnetic circuit unit 6c, armature assembly 7c, and movable spring lead piece 8c described in the above-described embodiments. The first armature, second armature, and permanent magnet of the armature assembly 7c are combined into an integrated member having an I-shaped structure via a plastic member. The yoke of the magnetic circuit unit 6c engages with openings on both sides of the I-shaped structure of the armature assembly 7c. The fixed contact 52c is fixed to one end of the fixed spring 51c, and the other end of the fixed spring 51c typically extends outside the relay housing as a lead piece. A movable contact is fixed to one end of the movable spring leaf, and one end of the movable spring lead piece 8c is fixed to the other end of the movable spring leaf. The other end of the movable spring leaf 8c also extends outside the relay housing as a lead piece. The movable contact and the fixed contact 52c are in an engaged position, and the armature assembly 7c engages with one end of the push card 2c via the plastic push arm 71c, and the other end of the push card 2c engages with the movable spring piece.

[0168] In the multi-contact movable spring piece and electromagnetic relay disclosed herein, at least two of the oscillating members further include a rib 18c between the movable contact and the base, improving the rigidity of the oscillating member. The other oscillating members do not include a rib. In this structure disclosed herein, during the disconnection process between each movable contact and its corresponding fixed contact from a closed state to an open state, the oscillating member with the rib 18c has high rigidity, resulting in a faster disconnection speed and a larger contact gap between the movable contact and its corresponding fixed contact after disconnection. On the other hand, the oscillating member without the rib 18c has relatively low rigidity, resulting in a slower disconnection speed and a smaller contact gap between the movable contact and its corresponding fixed contact after disconnection. Therefore, the present disclosure enables sequential disconnection, with the contact gaps between each movable contact and its corresponding fixed contact being different after disconnection. Therefore, in actual use, it is only necessary to measure the contact gap (minimum gap) between the movable contact on the oscillating member without ribs 18c and the corresponding fixed contact, and there is no need to measure the contact gap between the movable contact on the oscillating member with ribs and the corresponding fixed contact, which further simplifies the process control points.

[0169] In the multi-contact movable spring piece and electromagnetic relay of the present disclosure, flange structures 141c are provided on both sides of the extension, and by using the flange structures 141c, the generation of chips due to friction between the movable spring 1c and the push card 2c is reduced. This structure of the present disclosure uses the flange structures of the movable spring to contact the push card, thereby reducing friction between the movable spring and the push card when the movable spring oscillates, and reducing the generation of chips.

[0170] In the multi-contact movable spring piece and electromagnetic relay disclosed herein, a compression spring 4c is further connected to the side of each of the three oscillating members 11c, 12c, and 13c that faces away from the movable contacts. The base of the compression spring 4c is fixed to each of the three movable contact fixing positions of the oscillating member, and the ends of the compression spring 4c branch into three pieces that each extend to the corresponding card slot of the push card 2c. This structure disclosed herein does not require additional positioning, reducing the number of parts and lowering costs.

[0171] Example 8 28 and 29, in the multi-contact movable spring element and electromagnetic relay of the present disclosure, the movable spring is a two-contact movable spring, the main body 1c is provided with a slit, the main body 1c forms two oscillating members 11c and 12c that can freely oscillate relative to a base, the oscillating member 12c is provided with the extension 121c, and the oscillating member 11c is provided with a rib 18c, which differs from Example 7. The movable contact 32c of the oscillating member 12c and the movable contact 31c on the oscillating member 11c are arranged to be offset in the length direction L of the main body 1c, and the movable contact 32c is larger than the movable contact 31c.

[0172] Example 9 30 and 31 , in the multi-contact movable spring element and electromagnetic relay of the present disclosure, the movable spring is a five-contact movable spring, and four slits are opened in the main body 1c, thereby forming five oscillating members 11c, 12c, 13c, 20c, and 21c that can freely oscillate with respect to the base of the main body 1c, and the oscillating member 12c is provided with the extension 121c, and ribs 18c are provided on each of the oscillating members 11c, 13c, 20c, and 21c, which differ from Example 7. The movable contact 32c of the oscillating member 12c and the movable contacts 31c, 33c, 34c, and 35c of the oscillating members 11c, 13c, 20c, and 21c on both sides are arranged with a shift in the length direction L of the main body 1c, and the movable contact 32c is larger than the movable contacts 31c, 33c, 34c, and 35c.

[0173] It should be understood that the present disclosure is not limited in its application to the precise construction and arrangement of components described herein. The present disclosure may have other embodiments and may be realized and carried out in various ways. The foregoing variations and modifications are within the scope of the present disclosure. The present disclosure as disclosed and defined herein should be understood to cover all alternative combinations of two or more individual features described or illustrated in the text and / or drawings. All of these different combinations constitute multiple alternative aspects of the present disclosure. The examples described herein illustrate the best modes known for carrying out the present disclosure and will enable those skilled in the art to utilize the present disclosure.

Claims

1. a multi-contact movable spring piece including a main body, the main body having opposite first and second surfaces, opposite first and second ends along its length, and opposite sides along its width, a portion of the main body adjacent to the first end being a base, the main body having at least one slit extending from the base toward the second end of the main body, whereby the main body forms at least two rocking members that are freely rockable relative to the base, and a movable contact is fixed to the first or second surface of each of the rocking members at a position adjacent to the free end of the rocking member; An extension part extending in a direction away from the movable contact is provided at a free end of one of the at least two rocking members, and the extension part is used for engaging with a card slot of a push card. A connecting piece is fixed to one of the at least two rocking members, and the connecting piece includes a piece body and an elastic arm extending along the width direction of the main body of the movable spring piece. The elastic arm abuts against the remaining rocking members excluding the rocking member to which the connecting piece is fixed, and the contact gap between the movable contact on the rocking member and the corresponding fixed contact is adjusted by adjusting the pressure value applied by the elastic arm to the rocking member. A multi-contact movable spring piece characterized by:

2. The number of the swinging members is odd, and the extension portion is provided on the most central swinging member among the plurality of swinging members, and the connecting piece has two elastic arms, each of which abuts against the swinging members on both sides.

2. The multi-contact movable spring piece according to claim 1.

3. a flange structure is provided on each side of the extension portion, so as to reduce the generation of chips due to friction between the movable spring piece and the push card by using the flange structure; 3. The multi-contact movable spring piece according to claim 1 or 2.

4. The connecting piece is fixed to the surface of the swinging member on which the extension portion is provided.

2. The multi-contact movable spring piece according to claim 1.

5. The connecting piece extends from the base of the main body toward the second end of the main body until it is flush with the extension.

5. The multi-contact movable spring piece according to claim 4.

6. A limiting bend portion is provided at the end of one of the connecting pieces.

5. The multi-contact movable spring piece according to claim 4.

7. A bent portion is provided on one side of the connecting piece, and the bent portion is located between the movable contact and the limiting bent portion.

6. The multi-contact movable spring piece according to claim 5.

8. The elastic arm of the connecting piece has at least a pair of V-shaped portions that open in opposite directions, and the V-shaped portions have a trapezoidal planar shape after being unfolded.

2. The multi-contact movable spring piece according to claim 1.

9. The main body is formed by stacking a plurality of spring pieces, the swinging member is formed by stacking a plurality of spring pieces, the flange structure is provided on one of the outer spring pieces, the flange structures on both sides are bent toward the adjacent spring pieces, and relief structures are provided on both sides of the adjacent spring pieces.

4. The multi-contact movable spring piece according to claim 3.

10. The movable contact of the rocking member to which the connecting piece is fixed and the movable contact of the other rocking member are arranged to be offset in the length direction of the body, the movable contact of the rocking member to which the connecting piece is fixed is larger than the movable contact of the other rocking member, and the width of the rocking member to which the connecting piece is fixed is larger than the width of the other rocking member.

2. The multi-contact movable spring piece according to claim 1.

11. The number of the swinging members is two, the extension portion is provided on one of the swinging members, the connecting piece has one of the elastic arms, and the elastic arm extends toward the other swinging member and abuts against the other swinging member.

2. The multi-contact movable spring piece according to claim 1.

12. An electromagnetic relay comprising the multi-contact movable spring piece according to any one of claims 1 to 11.

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