Multi-contact movable reed and electromagnetic relay

Abstract

A multi-contact movable reed, comprising a body which is provided with two opposite surfaces, two opposite ends in the length direction of the body, and two opposite sides in the width direction thereof, wherein the part of the body close to a first end is a root, the body is provided with at least one slit in the length direction to form at least two swinging members capable of freely swinging relative to the root of the body; and a movable contact is fixed to the position of one surface of each swinging member close to a free end of the swinging member. The free end of at least one swinging member is provided with an extension portion. which extends in a direction away from the movable contact. A connecting piece is fixed to at least one swinging member, and the connecting piece comprises a piece body and an elastic arm extending in the width direction of the body of the moving reed, wherein the elastic arm abuts against the swinging member other than the swinging member to which the connecting piece is fixed; and by adjusting the value of pressure applied to the swinging member by the elastic arm, a contact gap between the movable contact on the swinging member and a corresponding fixed contact is adjusted.

Description

CROSS-REFERENCE

[0001] This disclosure claims priority to the Chinese patent applications with application numbers 202310192957.X, 202310192963.5, and 202320370442.X, all filed on March 02, 2023. The entire contents of these Chinese patent applications are incorporated herein by reference.TECHNICAL FIELD

[0002] This disclosure relates to the field of relay technology, and more particularly, to a movable contact piece with multi-contact and an electromagnetic relay.BACKGROUND

[0003] A relay is an electronic control device. It has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). The relay is usually applied in automatic control circuits. The relay is actually a kind of "automatic switch" that uses a smaller current to control a larger current. The relay plays roles of automatic regulation, safety protection, and circuit conversion in the circuit. The relay is a thermally sensitive component. When the temperature exceeds its tolerance threshold, it will accelerate the aging of the internal plastic and insulating materials of the relay, causing the contact points to be oxidized and corroded, making arc extinction difficult, the degradation of electrical component technical parameters, and a decrease in reliability.

[0004] In order to achieve low temperature rise of the contact resistance, in a relay with a multi-contact structure in the related technology, a movable contact component includes a movable contact, a movable contact piece, and a movable lead-out piece. The movable contact piece has a first end and a second end. The first end of the movable contact piece is connected to one end of the movable lead-out piece. The second end of the movable contact piece is fixed to the movable contact. Two slots are provided on the movable contact piece extending from the second end to the first end (the end connected to the movable lead-out piece), dividing the movable contact piece into three current-carrying conductors. There are three movable contacts, respectively fixed on the corresponding current-carrying conductor, thereby dividing the movable contact piece into a three-way parallel structure. This structure designs the contact components into a multi-group parallel contact structure, reducing the current through each current-carrying conductor, thereby reducing the temperature rise.

[0005] In order to ensure that the multiple contact gaps are consistent when the movable and static contacts are disconnected, and to reduce the fluctuation of the multiple contact gaps caused by the tilt of the push card, the movable contact piece in the related technology has a connecting piece installed on the side facing the static contact. The connecting piece is connected between the movable contacts. This arrangement completely fixes the connecting piece to the three movable contacts. This arrangement can maintain the consistency of each contact gap, but cannot be adjusted. This arrangement cannot meet the requirements under certain specific conditions. How to maintain the consistency of contact gaps while being able to adjust the contact gaps when needed has become an urgent problem to be solved.SUMMARY

[0006] The purpose of this disclosure is to overcome the shortcomings of the related technology and provide a movable contact piece with multi-contact and an electromagnetic relay. Through improving the structure, the elastic arm of the connecting piece abuts against the adjacent swing piece. When the elastic arm does not exert pressure on the swing piece, the contact gaps can remain consistent. Moreover, the contact gap between the movable contact on the swing piece and the corresponding static contact can be adjusted by regulating the magnitude of the force exerted by the elastic arm on the swing piece.

[0007] According to one aspect of this disclosure, a movable contact piece with multi-contact, including: a body having opposite first surface and second surface, opposite first end portion and second end portion along a length direction of the body, and opposite sides along a width direction of the body, a part of the body near the first end portion being a root portion, the body having at least one slot extending from the root portion towards the second end, forming at least two swing pieces swinging freely relative to the root portion, each swing piece having a movable contact fixed on one of the first surface and second surface near a free end of the swing piece, wherein at least one of the at least two swing pieces has an extension portion extending away from the movable contact at the free end to cooperate with a retention slot of the push card, at least one of the at least two swing pieces is fixed with a connecting piece, the connecting piece including a piece body and an elastic arm extending along the width direction of the body of the movable contact piece, the elastic arm abutting against remaining swing pieces other than the swing piece fixed with the connecting piece, contact gaps between the movable contact on the swing piece and the corresponding static contact being adjustable by regulating a pressure exerted by the elastic arm on the swing piece.

[0008] According to one embodiment of this disclosure, a number of the swing pieces is odd, the extension portion is provided on a middle swing piece among the swing pieces, and the connecting piece has two elastic arms, each abutting against the swing pieces on both sides.

[0009] According to one embodiment of this disclosure, the extension portion has a flanged structure on both sides to reduce friction between the movable contact piece and the push card so as to reduce shavings.

[0010] According to one embodiment of this disclosure, the piece body of the connecting piece is fixed on a surface of the swing piece provided with the extension portion.

[0011] According to one embodiment of this disclosure, the piece body of the connecting piece extends along a direction from the root portion of the body towards the second end of the body to be flush with the extension portion.

[0012] According to one embodiment of this disclosure, an end of the piece body of the connecting piece has a limit bend.

[0013] According to one embodiment of this disclosure, the piece body of the connecting piece has a bend portion between the movable contact and the limit bend.

[0014] According to one embodiment of this disclosure, the elastic arm of the connecting piece has at least one pair of V-shaped portions with opposite opening directions; wherein an unfolded planar shape of the V-shaped portion is trapezoidal.

[0015] According to one embodiment of this disclosure, the body includes multiple piece bodies stacked together, and the swing piece includes multiple piece bodies stacked together; the flanged structure is provided on an outermost piece body, and the two sides of the flanged structure are bent towards adjacent piece body, and the adjacent piece body has a clearance structure on both sides.

[0016] According to one embodiment of this disclosure, the movable contact on the swing piece fixed with the connecting piece is offset from the movable contacts on other swing pieces in the length direction of the body, and the movable contact on the swing piece fixed with the connecting piece is larger than the movable contacts on other swing pieces, and the width of the swing piece fixed with the connecting piece is greater than the widths of other swing pieces.

[0017] According to one embodiment of this disclosure, the number of swing pieces is two, the extension portion is provided on one of the swing pieces, and the connecting piece has one elastic arm, the elastic arm extending towards and abutting against another swing piece.

[0018] According to one aspect of this disclosure, a n electromagnetic relay including the movable contact piece with multi-contact of present disclosure.

[0019] Compared with the related technology, the beneficial effects of this disclosure are as follows: 1. In this disclosure, one of the swing pieces is provided with an extension portion that cooperates with the retention slot of the push card, and one of the swing pieces is also fixed with a connecting piece. The elastic arm of the connecting piece abuts against the adjacent swing piece. With this structure of this disclosure, when the push card drives one of the swing pieces to swing, the connecting piece can drive the other swing pieces to move, avoiding the differences in contact gaps caused by the tilt of the push card, that is, it can ensure the consistency of the contact gaps. Moreover, when needed, the contact gap between the movable contact on the swing piece and the corresponding static contact can be adjusted by regulating the magnitude of the pressure exerted by the elastic arm on the swing piece, that is, the contact gaps can also be adjusted according to actual needs to make them inconsistent. At the same time, in actual use, after the movable and static contacts are disconnected, it is only necessary to measure the contact gap (minimum gap) between the movable contact and the corresponding static contact on the swing piece that is fixed with the connecting piece. The contact gap between the movable contact and the corresponding static contact on the swing piece that is not fixed with the connecting piece does not need to be measured, which can further simplify the process control points. 2. In this disclosure, flanged structures are provided on both sides of the extension portion. With this structure of this disclosure, the flanged structure of the movable contact piece contacts the push card, reducing the friction between the movable contact piece and the push card when the movable contact piece swings, thereby reducing the generation of shavings. 3. In this disclosure, the piece body of the connecting piece extends to be flush with the end of the extension portion and has a limit bend at its end. With this structure of this disclosure, the push card can be positioned to prevent the push card from disengaging. 4. In this disclosure, the piece body of the connecting piece has a bend portion. With this structure of this disclosure, the rigidity of the connecting piece is reduced, which can prevent permanent deformation after long-term movement. 5. In this disclosure, the elastic arm of the connecting piece has at least two V-shaped portions, and the opening directions of at least two V-shaped portions are opposite. The unfolded planar shape of each V-shaped portion is trapezoidal. With this structure of this disclosure, the elastic arm makes line contact with the swing piece through the arc surface of the V-shaped portion at the end of the elastic arm, reducing the friction between them. Moreover, because the unfolded planar shape of the V-shaped portion is trapezoidal, the deformation position of the elastic arm occurs near the contact position with the swing piece, and the deformation of the root portion of the elastic arm is small, which can more reliably apply pressure. 6. In this disclosure, the movable contacts on the swing piece that is fixed with the connecting piece and the movable contacts on the remaining swing pieces are offset from each other in the length direction of the movable contact piece, and the movable contact on the swing piece that is fixed with the connecting piece is larger than the movable contacts on the remaining swing pieces. The width of the swing piece that is fixed with the connecting piece is greater than the width of the remaining swing pieces. With this structure of this disclosure, the swing piece that is fixed with the connecting piece has the largest width and the largest movable contact, ensuring that the most current flows through it. Moreover, because of the larger width, the deformation is more difficult, so the amount of deformation of the swing piece that is fixed with the connecting piece is small. In applications where the contact gaps are inconsistent, the gap difference between the contact gaps can be more reliably controlled. At the same time, because the elastic arm of the connecting piece presses against the remaining swing pieces, these swing pieces are moved away from the swing piece that is fixed with the connecting piece. Therefore, the contact gap between the movable contact and the corresponding static contact on the swing piece that is fixed with the connecting piece is smaller than the contact gap between the movable contact and the corresponding static contact on the remaining swing pieces. When multiple closed movable and static contacts are disconnected, the movable contacts on the remaining swing pieces are separated from the corresponding static contacts first, and then the movable contact on the swing piece that is fixed with the connecting piece is separated from the corresponding static contact. In this way, when multiple movable and static contacts are disconnected instantaneously, an electric arc is only generated between the movable contact and static contact on the swing piece that is fixed with the connecting piece, and no electric arc is generated between the movable contact and static contact on the remaining swing pieces. This is conducive to reducing the resistance temperature rise, thereby reducing the relay temperature rise and extending the service life.

[0020] The purpose of this disclosure is to overcome the deficiencies of the related technology and provide a movable contact piece with multi-contact and an electromagnetic relay. By improving the structure, the two sides of the connecting piece extend to both sides and elastically abut against the two swing pieces on both sides. While maintaining the consistency of the contact gap, the gap difference between the middle contact and the side contacts can be adjusted by regulating the height difference between the two ends of the connecting piece and the two swing pieces on both sides.

[0021] The technical solution adopted by this disclosure to solve the above technical problems is: a movable contact piece with multi-contact including a movable contact piece body. The movable contact piece body has at least one slot opened upward from a root portion, so that the movable contact piece body forms at least two swing pieces swinging freely relative to the root portion. One surface of a free end of each swing piece is fixed with a movable contact. One of the swing pieces has an extension portion extending upward from a connection with the movable contact to cooperate with a retention slot of the push card. A connecting piece is fixedly connected to the movable contact of one of the swing pieces. The connecting piece extends to a side and elastically abuts against adjacent swing piece to adjust a gap difference between the contact of one of the swing pieces and adjacent contact by regulating a height difference between the swing piece with the connecting piece and the adjacent swing piece.

[0022] According to one embodiment of this disclosure, a number of the swing pieces is odd. The extension portion is located in the swing piece at the middle of the odd swing piece. The two sides of the connecting piece extend to both sides and elastically abut against the swing pieces on both sides to adjust the gap difference between a middle contact and side contacts by regulating the height difference between the middle swing piece and the swing pieces on both sides.

[0023] According to one embodiment of this disclosure, the two sides of the extension portion of one of the swing pieces are provided with flanged structures to reduce friction between the movable contact piece and the push card by the bending of the flanged structures.

[0024] According to one embodiment of this disclosure, the connecting piece is fixed on one surface of one of the swing pieces.

[0025] According to one embodiment of this disclosure, the connecting piece extends upward to be flush with the extension portion, and has a limit bend at end.

[0026] According to one embodiment of this disclosure, a U-shaped bend is provided in the connecting piece between the connection with the movable contact at the middle and the end.

[0027] According to one embodiment of this disclosure, the connecting piece has at least one double-V-shaped bend in a section cooperating with adjacent swing piece. Each double-V-shaped bend has two V-shaped bends that are oppositely arranged. The V-shaped bend close to the swing piece elastically abuts against the corresponding swing piece. The unfolded planar shape of the double-V-shaped bend is trapezoidal.

[0028] According to one embodiment of this disclosure, the movable contact piece body comprises multiple piece bodies stacked together. The flanged structure is provided on one of the first piece bodies at outer the side and corresponding to one surface of the free end of the swing piece. The flanged structures on two sides are bent towards a second piece body. Two edges of the second piece body are provided with clearance structures.

[0029] According to one embodiment of this disclosure, the movable contact on one of the swing pieces is offset from the movable contact on adjacent swing piece, and the movable contact on one of the swing pieces is larger than the movable contact on adjacent swing piece. A width of the piece body of one of the swing pieces is greater than a width of the piece body of adjacent swing piece.

[0030] The electromagnetic relay of this disclosure includes the movable contact piece with multi-contact as described above in this disclosure.

[0031] Compared with the related technology, the beneficial effects of this disclosure are as follows: 1.In this disclosure, one of the swing pieces has an extension portion that extends upward from the connection with the movable contact to cooperate with the retention slot of the push card. A connecting piece is also fixedly connected to the movable contact of one of the swing pieces. The connecting piece extends to the side and elastically abuts against the adjacent swing piece. With this structure of this disclosure, the connecting piece drives the other swing pieces to move when the push card drives one of the swing pieces to swing, avoiding the gap difference caused by the tilt of the push card. Moreover, the gap difference between the contact of one of the swing pieces and the adjacent contact can be adjusted by regulating the height difference between the swing piece with the connecting piece and the adjacent swing piece, which can maintain the consistency of the contact gap and can also be adjusted according to actual needs. 2.In this disclosure, the two sides of the extension portion of one of the swing pieces are provided with flanged structures. With this structure of this disclosure, the flanged structure of the movable contact piece contacts the push card through its bending, reducing the friction between the movable contact piece and the push card when the movable contact piece swings, thereby reducing the generation of shavings. 3.In this disclosure, the connecting piece extends upward to be flush with the extension portion, and its end has a limit bend. With this structure of this disclosure, the push card can be positioned to prevent the push card from disengaging. 4.In this disclosure, a U-shaped bend is provided in the connecting piece between the connection with the middle movable contact and the end. With this structure of this disclosure, the rigidity of the connecting piece is reduced, which can prevent permanent deformation after long-term movement and ensure the maintenance of the gap difference. 5.In this disclosure, the connecting piece has at least one double-V-shaped bend in the section cooperating with the adjacent swing piece. Each double-V-shaped bend has two V-shaped bends that are oppositely arranged. The V-shaped bend close to the swing piece elastically abuts against the corresponding swing piece. The unfolded planar shape of the double-V-shaped bend is trapezoidal. With this structure of this disclosure, the contact forms an arcuate line contact, reducing the friction and making the contact more stable. Moreover, because the unfolded planar shape of the double-V-shaped bend is trapezoidal, the deformation position occurs at the contact position, and the deformation of the root portion is small, which can more reliably transmit the displacement of the middle contact. 6.In this disclosure, the movable contact on one of the swing pieces is offset from the movable contact on the adjacent swing piece, and the movable contact on one of the swing pieces is larger than the movable contact on the adjacent swing piece. The width of the piece body of one of the swing pieces is greater than the width of the piece body of the adjacent swing piece. With this structure of this disclosure, the movable contact on one of the swing pieces is the largest, and the corresponding slot width is the largest to ensure the most current flow through it. Moreover, because the larger width makes deformation more difficult, the amount of deformation of the piece body of one of the swing pieces is small, indirectly making the contact gap the smallest. The arc occurs on the large contact with the smallest gap during the life process, ensuring the reliability of the life.

[0032] The purpose of this disclosure is to overcome the deficiencies of the related technology and provide a connecting structure of movable contact piece and push card, and an electromagnetic relay. On one hand, by providing a flanged structure on the first piece body, the generation of shavings in the width direction between the movable contact piece and the push card when the movable contact piece swings are reduced. On the other hand, the push card only contacts the first piece body, reducing the generation of shavings in the thickness direction between the movable contact piece and the push card when the movable contact piece swings.

[0033] The technical solution adopted by this disclosure to solve the above technical problems is: a connecting structure of movable contact piece and push card including the movable contact piece and the push card. The movable contact piece has at least one slot opened upward from a root portion, forming at least two swing pieces swinging freely relative to the root portion. Each swing piece has a movable contact fixed on one surface of a free end. Each swing piece has an extension portion extending upward from a connection with the movable contact. The push card has at least two retention slots arranged in parallel and penetrating through a thickness direction. The extension portions of the swing pieces are respectively fitted into the corresponding retention slots. Both sides of the extension portion of one of the swing pieces respectively have a flanged structure, a distance between the flanged structure of the extension portion of one of the swing pieces and the corresponding side wall of the corresponding retention slot is less than a distance between a side of the extension portion of the adjacent swing piece and the corresponding side wall of the corresponding retention slot. This allows the flanged structure of the movable contact piece to contact the push card through a bending of the flanged structure, reducing the generation of shavings in the width direction between the movable contact piece and the push card when the movable contact piece swings.

[0034] According to one embodiment of this disclosure, a number of the swing pieces is odd, and the flanged structure is provided on the swing piece at the middle.

[0035] According to one embodiment of this disclosure, a sum of the distances between two flanged structures on the sides of the extension portion of one swing piece and the corresponding side walls of the corresponding retention slot is less than a distance between a side of the extension portion of the adjacent swing piece and the corresponding side wall of the corresponding retention slot.

[0036] According to one embodiment of this disclosure, the movable contact piece comprises multiple piece bodies stacked together, and the flanged structure is provided on one of the piece bodies.

[0037] According to one embodiment of this disclosure, the flanged structure is provided on one of the first piece bodies at outer the side and corresponding to one surface of the free end of the swing piece, and the flanged structures on two sides are bent towards a second piece body. Two edges of the second piece body are respectively provided with a clearance structure.

[0038] According to one embodiment of this disclosure, each piece body of the swing pieces has a shoulder near the extension portion, and the shoulder on one piece body is set higher to ensure that only one piece body of the movable contact piece contacts the push card in the thickness direction of the push card when the movable contact piece operates, thereby reducing the generation of shavings in the thickness direction between the movable contact piece and the push card when the movable contact piece swings.

[0039] According to one embodiment of this disclosure, the movable contact piece comprises four piece bodies stacked together. A first piece body, a second piece body, and a third piece body are respectively provided with an extension portion, while a fourth piece body is not provided with an extension portion.

[0040] According to one embodiment of this disclosure, the first piece body, the second piece body, and the third piece body of each swing piece respectively have a shoulder near the extension portion, and the shoulder on the first piece body is higher than the shoulders on the second and third piece bodies to ensure that only the first piece body of the movable contact piece contacts the push card in the thickness direction of the push card when the movable contact piece operates, thereby reducing the generation of shavings in the thickness direction between the movable contact piece and the push card when the movable contact piece swings.

[0041] According to one embodiment of this disclosure, the first piece body, the second piece body, and the third piece body of each swing piece are bent into a U-shape between a connection with the movable contact and the root portion, with openings of the U-shape facing away from a surface connected with the movable contact.

[0042] The electromagnetic relay of this disclosure includes the connecting structure of movable contact piece and push card as described above in this disclosure.

[0043] Compared with the related technology, the beneficial effects of this disclosure are as follows: 1.In this disclosure, both sides of the extension portion of one of the swing pieces have flanged structures, and the distance between the flanged structure of the extension portion of this swing piece and the corresponding side wall of the corresponding retention slot is less than the distance between the side of the extension portion of the adjacent swing piece and the corresponding side wall of the corresponding retention slot. This structure of this disclosure allows the flanged structure of the movable contact piece to contact the push card through its bending, reducing the generation of shavings in the width direction between the movable contact piece and the push card when the movable contact piece swings. 2.In this disclosure, the first piece bodies, the second piece bodies, and the third piece bodies of the three swing pieces respectively have a shoulder near the extension portion, and the shoulder on the first piece body is higher than the shoulders on the second and third piece bodies. This structure of this disclosure ensures that only the first piece body of the movable contact piece contacts the push card in the thickness direction of the push card when the movable contact piece operates, thereby reducing the generation of shavings in the thickness direction between the movable contact piece and the push card when the movable contact piece swings.

[0044] The purpose of this disclosure is to overcome the deficiencies of the related technology and provide a movable contact piece with three-contact-gap-difference and electromagnetic relay. By providing ribs on two swing pieces on both sides and not in the middle, the middle contact gap is ensured to be smaller than the contact gaps on both sides to achieve the effect of the gap difference between the three contacts.

[0045] The technical solution adopted by this disclosure to solve the above technical problems is: a movable contact piece with multi-contact-gap-difference including a movable contact piece body. The movable contact piece body has at least one slot opened upward from a root portion, forming at least two swing pieces swinging freely relative to the root portion. One surface of a free end of each swing piece fixed with a movable contact. At least one of the swing pieces has an extension portion extending upward from a connection with the movable contact to cooperate with the retention slot of the push card. Some of the at least two swing pieces also have a rib between the connection with the movable contact and the root portion to increase rigidity of the swing piece and ensure a gap difference between the movable contacts.

[0046] According to one embodiment of this disclosure, a number of the swing pieces is odd, and the extension portion is provided on the swing piece at the middle.

[0047] According to one embodiment of this disclosure, two sides of the extension portion of one of the at least two swing pieces are provided with flanged structures to reduce friction between the movable contact piece and the push card through a bending of the flanged structures and thereby reduce the generation of shavings.

[0048] According to one embodiment of this disclosure, the rib is strip-shaped.

[0049] According to one embodiment of this disclosure, the rib is located in a middle position of a width of the corresponding swing piece.

[0050] According to one embodiment of this disclosure, the rib is formed by pressing one side of the swing piece to create a recess, making another side protrude facing away from the surface connected with the movable contact.

[0051] According to one embodiment of this disclosure, a pressure spring is connected to the side of at least two swing pieces away from the movable contact. A root portion of the pressure spring is fixed at the swing pieces where the movable contacts are fixed, and an end of the pressure spring is forked into at least two branches extending to the corresponding retention slot of the push card.

[0052] According to one embodiment of this disclosure, the movable contact piece body comprises multiple piece bodies stacked together. The flanged structures are provided on the first piece bodies at the outer side and corresponding to one surface of the free end of the swing piece, and the flanged structures on two sides are bent towards a second piece body. Two sides of the second piece body are respectively provided with a clearance structure.

[0053] According to one embodiment of this disclosure, the movable contact on at least one swing piece is offset from the movable contact on the adjacent swing piece, and the movable contact on at least one swing piece is larger than the movable contact on the adjacent swing piece.

[0054] The electromagnetic relay of this disclosure includes the movable contact piece with multi-contact-gap-difference as described above in this disclosure.

[0055] Compared with the related technology, the beneficial effects of this disclosure are as follows: 1.In this disclosure, at least one of the swing pieces has an extension portion extending upward from the connection with the movable contact to cooperate with the retention slot of the push card, and some of the swing pieces also have a rib between the connection with the movable contact and the root portion to increase the rigidity of the swing piece and ensure the gap difference between the movable contacts. This structure of this disclosure allows the rib to enhance the rigidity of part of the swing piece. The stronger the rigidity of the piece body, the smaller the deformation, and the larger the gap between the movable and static contacts. By setting the rib on part of the swing piece of the movable contact piece, the rigidity of the movable contact piece is enhanced. When the same travel is achieved, due to the higher rigidity of part of the swing piece, the contact gap of the piece body of part of the swing piece is larger than that of the swing piece without the rib thereby ensuring the effect of the gap difference between multiple contacts. Moreover, by setting the gap difference between the contacts, only the contacts with the minimum gap (without the rib) needs to be measured in actual use, and the contact with the rib does not need to be measured, which can further simplify the process control points. 2.In this disclosure, the two sides of the extension portion of one swing piece are provided with flanged structures to reduce the friction between the movable contact piece and the push card through the bending of the flanged structures and thereby reduce the generation of shavings. This structure of this disclosure allows the flanged structure of the movable contact piece to contact the push card through its bending, reducing the friction between the movable contact piece and the push card when the movable contact piece swings, thereby reducing the generation of shavings. 3.In this disclosure, a pressure spring is connected to the side of the three swing pieces away from the movable contact. The root portion of the pressure spring is respectively fixed at the swing pieces where the three movable contacts are fixed, and the end of the pressure spring is forked into three branches, each extending to the corresponding retention slot of the push card. This structure of this disclosure eliminates the need for auxiliary positioning, reduces the number of parts used, and thereby reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The above and other features and advantages of this disclosure will become more apparent through a detailed description of its exemplary embodiments with reference to the accompanying drawings. FIG. 1 is a three-dimensional structural diagram of the movable contact piece with three-contact in Embodiment One of this disclosure. FIG. 2 is a front view of the movable contact piece with three-contact in Embodiment One of this disclosure. FIG. 3 is a side view of the movable contact piece with three-contact in Embodiment One of this disclosure. FIG. 4 is an enlarged view of area A in FIG. 3. FIG. 5 is a current-carrying diagram of the movable contact piece with three-contact in Embodiment One of this disclosure. FIG. 6 is a partial construction diagram of the electromagnetic relay in this disclosure. FIG. 7 is a three-dimensional structural diagram of the movable contact piece with two-contact in Embodiment Two of this disclosure. FIG. 8 is a top view of the movable contact piece with two-contact in Embodiment Two of this disclosure. FIG. 9 is a side view of the movable contact piece with two-contact in Embodiment Two of this disclosure. FIG. 10 is a three-dimensional structural diagram of the movable contact piece with five-contact in Embodiment Three of this disclosure. FIG. 11 is a top view of the movable contact piece with five-contact in Embodiment Three of this disclosure. FIG. 12 is a side view of the movable contact piece with five-contact in Embodiment Three of this disclosure. FIG. 13 is a front view of the connecting structure of movable contact piece and push card in Embodiment Four of this disclosure. FIG. 14 is an enlarged view of area B in FIG. 13. FIG. 15 is a side view of the connecting structure of movable contact piece and push card in Embodiment Four of this disclosure. FIG. 16 is an enlarged view of area C in FIG. 3. FIG. 17 is a partial construction diagram of the electromagnetic relay in Embodiment Four of this disclosure. FIG. 18 is a three-dimensional structural diagram of the connecting structure of movable contact piece and push card in Embodiment Five of this disclosure. FIG. 19 is a front view of the connecting structure of movable contact piece and push card in Embodiment Five of this disclosure. FIG. 20 is a three-dimensional structural diagram of the connecting structure of movable contact piece and push card in Embodiment Six of this disclosure. FIG. 21 is a front view of the connecting structure of movable contact piece and push card in Embodiment Six of this disclosure. FIG. 22 is a three-dimensional structural diagram of the movable contact piece with three-contact in Embodiment Seven of this disclosure (with the rib upward). FIG. 23 is a front view of the movable contact piece with three-contact in Embodiment Seven of this disclosure. FIG. 24 is a top view of the movable contact piece with three-contact in Embodiment Seven of this disclosure. FIG. 25 is a three-dimensional structural diagram of the movable contact piece with three-contact in Embodiment Seven of this disclosure (with the U-shaped portion upward). FIG. 26 is an enlarged view of area D in FIG. 25. FIG. 27 is a partial construction diagram of the electromagnetic relay in Embodiment Seven of this disclosure. FIG. 28 is a three-dimensional structural diagram of the movable contact piece with two-contact in Embodiment Eight of this disclosure (with the rib upward). FIG. 29 is a top view of the movable contact piece with two-contact in Embodiment Eight of this disclosure. FIG. 30 is a three-dimensional structural diagram of the movable contact piece with five-contact in Embodiment Nine of this disclosure (with the rib upward). FIG. 31 is a top view of the movable contact piece with five-contact in Embodiment Nine of this disclosure. DETAILED DESCRIPTION

[0057] Now, exemplary embodiments will be described more comprehensively with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship between one component of a drawing and another component, these terms are used in this specification merely for convenience, for example, based on the orientation of the example in the drawing. It should be understood that if the device in the drawing is flipped upside down, the component described as being "upper" will become the component "lower." Other relative terms, such as "top," "bottom," and the like, are also to be interpreted in a similar manner. When a structure is described as being "on" another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0058] The terms "a," "an," "the," and similar terms are used to indicate the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to indicate an open-ended inclusion, meaning that there may be additional elements / components / etc. beyond those listed; the terms "first," "second," and the like are used merely as labels and do not limit the number of objects they refer to.Embodiment One

[0059] The movable contact piece with multi-contact of this disclosure includes a body, an extension portion, and a connecting piece. The body has opposite first and second surfaces, opposite first and second end portions along its length direction, and opposite sides along its width direction. The part of the body near the first end portion is a root portion. The body has at least one slot that extends from the root portion towards the second end, forming at least two swing pieces that can swing freely relative to the root portion. Each swing piece has a movable contact fixed on either the first or second surface near the free end of the swing piece.

[0060] The extension portion is fixed to the free end of one of the at least two swing pieces, and extends away from the movable contact at the free end of swing piece. The extension portion is used to cooperate with the retention slot of the push card.

[0061] The connecting piece is fixed to one of the at least two swing pieces, and includes a piece body and an elastic arm that extends along the width direction of the body of the movable contact piece. The elastic arm abuts against the remaining swing pieces other than the swing piece to which the connecting piece is fixed. The contact gap between the movable contact on the swing piece and the corresponding static contact can be adjusted by regulating the pressure exerted by the elastic arm on the swing piece.

[0062] Referring to FIG. 1 to FIG. 5, the first embodiment of the movable contact piece with multi-contact of this disclosure is a movable contact piece with three-contact. This first embodiment includes a body 1a, an extension portion 121a, and a connecting piece 4a. The body 1a has opposite first and second surfaces, opposite first and second end portions along its length direction L, and opposite sides along its width direction W. The part of the body 1a near the first end portion is a root portion 10a.

[0063] The body 1a has two slots extending from the root portion 10a towards the second end of the body 1a, forming three swing pieces 11a, 12a, and 13a that can swing freely relative to the root portion 10a. The first surfaces near the free ends of the three swing pieces are respectively fixed with movable contacts 31a, 32a, and 33a.

[0064] The extension portion 121a is fixed to the free end of the middle swing piece 12a among the three swing pieces. The extension portion 121a extends away from the movable contact 32a from the free end of the swing piece 12a. The extension portion 121a is used to cooperate with the retention slot of the push card 2a (see FIG. 6).

[0065] The connecting piece 4a is fixed to the swing piece 12a at the middle. In one embodiment, the connecting piece 4a can be fixed simultaneously with the movable contact 32a, meaning that the fixing point of the connecting piece 4a on the swing piece 12a is the same as the fixing point of the movable contact 32a on the swing piece 12a. In this embodiment, the two sides of the extension portion 121a are respectively provided with flanged structures 122a, which are used to reduce the friction between the movable contact piece and the push card 2a to prevent the generation of shavings.

[0066] The connecting piece 4a includes a piece body 40a and an elastic arm 47a, and an elastic arm 47a extends along the width direction W of the body 1a of the movable contact piece from one side of the piece body 40a. In this embodiment, the connecting piece 4a has two elastic arms 47a, and two elastic arms 47a extend in opposite directions and respectively abut against the swing pieces 11a and 13a. Under the pressure of the two elastic arms 47a, the two swing pieces 11a and 13a can move a distance s relative to the swing piece 12a. Therefore, by adjusting the pressure exerted by the two elastic arms 47a on the two swing pieces 11a and 13a, the contact gaps between the movable contacts 31a and 33a on the swing pieces 11a and 13a and the corresponding static contacts can be adjusted to be greater than the contact gap between the movable contact 32a on the swing piece 12a and the corresponding static contact. That is to say, a gap difference h is formed between the contact gap of the movable contact 32a on the swing piece 12a and the static contact and the contact gaps of the movable contacts 31a and 33a on the swing pieces 11a and 13a and the corresponding static contacts (see FIG. 12).

[0067] Each elastic arm 47a of the connecting piece 4a has a pair of V-shaped portions 43a and 44a, with the openings of the pair of V-shaped portions 43a and 44a facing opposite directions. The two V-shaped portions 44a of the two elastic arms 47a that are away from the piece body 40a respectively abut against the swing pieces 11a and 13a. The unfolded planar shape of the V-shaped portions 43a and 44a is a trapezoidal shape.

[0068] In this embodiment, the connecting piece 4a is fixed to the first surface of the swing piece 12a at the middle. In other embodiments, the connecting piece 4a can also be fixed to the second surface of the swing piece 12a at the middle. The piece body 40a of the connecting piece 4a is flush with the end of the extension portion 121a, and the end of the piece body 40a has a limit bend 41a. A bend portion 42a is provided between the limit bend 41a and the movable contact 32a on the piece body 40a.

[0069] In this embodiment, a pressure spring 5a is connected to the side of the three swing pieces 11a, 12a, and 13a away from the movable contacts 31a, 32a, and 33a. The root portion of the pressure spring 5a is fixed at the fixing points of the three movable contacts 31a, 32a, and 33a on the swing pieces. The end of the pressure spring 5a is forked into three branches, each extending to the corresponding retention slot of the push card 2a.

[0070] In this embodiment, the body 1a includes multiple piece bodies stacked together, and the corresponding swing pieces also respectively include multiple piece bodies stacked together. The flanged structure 122a is provided on the first piece body 14a of the swing piece 12a at the outer side, and the two sides of the flanged structure 122a are bent towards the second piece body 15a. The corresponding positions of the second piece body 15a are respectively provided with a clearance structure 151a.

[0071] In this embodiment, the body 1a is composed of four piece bodies stacked together. The first piece body 14a, the second piece body 15a, and the third piece body 16a are respectively provided with corresponding extension portions, while the fourth piece body 17a is not provided with an extension portion. The first piece body 14a, the second piece body 15a, and the third piece body 16a of the three swing pieces respectively have a U-shaped portion 18a between the movable contacts 31a, 32a, 33a and the root portion 10a, and the opening of the U-shaped portion 18a faces away from the surface of the body with the movable contacts 31a, 32a, 33a.

[0072] In this embodiment, among the three swing pieces, the movable contact 32a on the middle swing piece 12a is offset from the movable contacts 31a and 33a on the two side swing pieces 11a and 13a in the length direction of the body 1a, and the movable contact 32a on the swing piece 12a is larger than the movable contacts 31a and 33a on the swing pieces 11a and 13a. The width of the swing piece 12a is greater than the widths of the swing pieces 11a and 13a.

[0073] Referring to FIG. 6, an electromagnetic relay of this disclosure includes a movable contact piece with three-contact, a static contact piece 61a, a static contact 62a, a magnetic circuit part 7a, an armature assembly 8a, and a movable lead-out piece 9a. A first armature, a second armature, and a permanent magnet of the armature assembly 8a are combined into an I-shaped structure through a plastic part. The yoke of the magnetic circuit part 7a is fitted at the openings on both sides of the I-shaped structure of the armature assembly 8a. The static contact 62a is fixed at one end of the static contact piece 61a, and the other end of the static contact piece 61a usually extends outside the housing of the relay as a lead-out part. One end of the movable contact piece with three-contact is fixed with movable contacts 31a, 32a, and 33a, and the other end of the movable contact piece with three-contact is fixed with one end of the movable lead-out piece 9a. The other end of the movable lead-out piece 9a extends outside the housing of the relay as a lead-out part. The movable contacts 31a, 32a, and 33a are positioned to cooperate with the static contact 62a. The armature assembly 8a is fitted at one end of the push card 2a through a plastic push arm 81a, and the other end of the push card 2a is fitted with the movable contact piece.

[0074] The movable contact piece with multi-contact and electromagnetic relay of this disclosure have an extension portion 121a at the free end of one of the swing pieces to cooperate with the retention slot of the push card. The movable contact of this swing piece is also fixedly connected to a connecting piece 4a. The connecting piece 4a has a piece body and an elastic arm extending from the piece body to the side, which abuts against the remaining swing pieces. With this structure, when the push card drives one of the swing pieces, the connecting piece can drive the other swing pieces to move, avoiding the inconsistency of the contact gap between each movable contact and the corresponding static contact caused by the tilt of the push card. Moreover, the pressure exerted by the elastic arm of the connecting piece on the swing piece can be adjusted, thereby adjusting the contact gap between each movable contact and the corresponding static contact to meet specific application scenarios.

[0075] In the movable contact piece with multi-contact and electromagnetic relay of this disclosure, the two sides of the extension portion 121a of the swing piece are respectively provided with flanged structures 122a. With this structure, the flanged structures 122a of the movable contact piece contact the push card 2a, reducing the friction between the movable contact piece and the push card 2a when the movable contact piece swings, thereby reducing the generation of shavings.

[0076] In the movable contact piece with multi-contact and electromagnetic relay of this disclosure, the piece body 40a of the connecting piece 4a is flush with the extension portion 121a, and the end of the piece body 40a has a limit bend 41a. With this structure, the push card 2a can be positioned to prevent the push card 2a from disengaging.

[0077] In the movable contact piece with multi-contact and electromagnetic relay of this disclosure, the piece body 40a of the connecting piece 4a has a bend portion 42a between the movable contact 32a and the limit bend 41a. With this structure, the rigidity of the connecting piece 4a is reduced, which can prevent permanent deformation after long-term movement.

[0078] In the movable contact piece with multi-contact and electromagnetic relay of this disclosure, the elastic arm 47a of the connecting piece 4a has two V-shaped portions 43a and 44a with opposite opening directions. The outer V-shaped portion 44a abuts against the corresponding swing piece. The unfolded planar shape of each V-shaped portion is trapezoidal. With this structure, the V-shaped portion makes line contact with the swing piece through its arc surface, reducing the friction between the elastic arm 47a and the swing piece. Moreover, because the unfolded planar shape of the V-shaped portion is trapezoidal, the deformation position of the elastic arm occurs near the contact position with the swing piece, and the deformation of the root portion of the elastic arm is small, which can more reliably apply pressure.

[0079] In the movable contact piece with multi-contact and electromagnetic relay of this disclosure, the movable contact on the swing piece with the connecting piece is offset from the movable contacts on the other swing pieces in the length direction of the body 1a of the movable contact piece, and the movable contact on the swing piece with the connecting piece is larger than the movable contacts on the other swing pieces. The width of the swing piece with the connecting piece is greater than the widths of the other swing pieces. With this structure, the movable contact on the swing piece with the connecting piece is the largest, ensuring that the most current flows through it. Moreover, because of the larger width, the deformation is more difficult, the amount of deformation of the swing piece with the connecting piece is small. In applications where the contact gaps are inconsistent, the gap difference between the contact gaps can be more reliably controlled. At the same time, because the elastic arm of the connecting piece presses against the remaining swing pieces, these swing pieces are moved away from the swing piece with the connecting piece. Therefore, the contact gap between the movable contact and the corresponding static contact on the swing piece with the connecting piece is smaller than the contact gap between the movable contacts and the corresponding static contacts on the remaining swing pieces. When multiple closed movable and static contacts are disconnected, the movable contacts on the remaining swing pieces are separated from the corresponding static contacts first, and then the movable contact on the swing piece with the connecting piece is separated from the corresponding static contact. In this way, when multiple movable and static contacts are disconnected instantaneously, an electric arc is only generated between the movable contact and static contact on the swing piece with the connecting piece, and no electric arc is generated between the movable contacts and static contacts on the remaining swing pieces. This is conducive to reducing the resistance temperature rise, thereby reducing the relay temperature rise and extending the service life.Embodiment Two

[0080] Referring to FIG. 7 to FIG. 9, the movable contact piece with multi-contact of this disclosure in Embodiment Two is different from Embodiment One in that the movable contact piece is a movable contact piece with two-contact. The body 1a has one slot forming two swing pieces 11a and 12a that can swing freely relative to the root portion. The first surface near the free end of each swing piece is respectively fixed with a movable contact, namely movable contacts 31a and 32a. In other embodiments, each movable contact can also be set on the second surface of each swing piece. The free end of the swing piece 12a is provided with an extension portion 121a to cooperate with the retention slot of the push card 2a. The movable contact 32a of the swing piece 12a is also fixedly connected to a connecting piece 4a. The connecting piece 4a includes a piece body 40a and an elastic arm 47a, which extends towards the swing piece 11a and abuts against it. The movable contact 32a on the swing piece 12a is offset from the movable contact 31a on the swing piece 11a in the length direction of the body 1a of the movable contact piece, and the movable contact 32a on the swing piece 12a is larger than the movable contact 31a on the swing piece 11a. The width of the swing piece 12a is greater than the width of the swing piece 11a.

[0081] The other structures of this Embodiment Two are basically the same as those of Embodiment One and will not be repeated here.Embodiment Three

[0082] Referring to FIG. 10 to FIG. 12, the movable contact piece with multi-contact and electromagnetic relay of this disclosure in Embodiment Three are different from Embodiment One in that the movable contact piece is a movable contact piece with five-contact. The body 1a has four slots forming five swing pieces 11a, 12a, 13a, 19a, and 20a that can swing freely relative to the root portion. The first surface near the free end of each swing piece is respectively fixed with a movable contact, namely movable contacts 31a, 32a, 33a, 34a, and 35a. The swing piece 12a is located in the middle position among the multiple swing pieces. The free end of the swing piece 12a is provided with an extension portion 121a to cooperate with the retention slot of the push card 2a. The movable contact 32a of the swing piece 12a is also fixedly connected with a connecting piece 4a. The connecting piece 4a includes a piece body 40a and two elastic arms 47a extending from the piece body 40a to both sides. Each elastic arm 4a has two pairs of V-shaped portions, each pair including two V-shaped portions with opposite opening directions. As shown in FIG. 12, four V-shaped portions of each elastic arm 4a are respectively 43a, 44a, 45a, and 46a. The movable contact 32a on the swing piece 12a is offset from the movable contacts 31a, 33a, 34a, and 35a on the other four swing pieces in the length direction of the body 1a. The movable contact 32a on the swing piece 12a is larger than the movable contacts 31a, 33a, 34a, and 35a on the other four swing pieces. The width of the swing piece 12a is greater than the widths of the swing pieces 11a, 13a, 19a, and 20a.

[0083] The other structures of this Embodiment Three are basically the same as those of Embodiment One and will not be repeated here.

[0084] The above are just the preferred embodiments of this disclosure and are not intended to limit this disclosure in any form. Although this disclosure has been disclosed with the preferred embodiments as described above, it is not intended to be limited thereby. Any person skilled in the art can make many possible changes and modifications to the technical solution disclosed herein, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this disclosure. Therefore, any simple modification, equivalent change, or decoration made to the above embodiments based on the technical essence of this disclosure, without departing from the content of the technical solution of this disclosure, should fall within the scope of protection of the technical solution of this disclosure.

[0085] In addition, a magnetic latching relay generally includes a magnetic circuit system, a contact system, a push mechanism, and a base. The magnetic circuit system generally comprises two basically symmetrical magnetic circuits, including a stationary magnetic component, a movable magnetic component, and a coil. The contact system includes a movable contact part and a static contact part. The push mechanism mainly includes a push card. When the relay coil is supplied with a forward pulse voltage, the magnetic circuit system operates, and the push card drives the movable contact part, causing the movable contact of the movable contact part to come into contact with the static contact of the static contact part, thereby actuating the relay. When the coil is supplied with a reverse pulse voltage, the magnetic circuit system operates, and the push card drives the movable contact part, causing the movable contact of the movable contact part to separate from the static contact of the static contact part, thereby resetting the relay. Herein, the push card serves as a component connecting plastic and metal, sliding relative to the metal part. Due to sliding friction, plastic shavings are easily generated. Moreover, in the related technology, the direction of movement of the push card and the metal part are in edge contact, without any anti-shaving design. The generated plastic shavings can easily cause the contacts to fail to conduct electricity.

[0086] This disclosure also provides a connecting structure of movable contact piece and push card and an electromagnetic relay. By providing a flanged structure on both sides of the extension portion of one swing piece, the generation of shavings between the movable contact piece and the push card in the width direction of the body of the movable contact piece during the swinging of the movable contact piece is reduced.

[0087] According to one aspect of this disclosure, a connecting structure of movable contact piece and push card includes the movable contact piece having a body. The body has opposite first and second end portions along its length direction and opposite sides along its width direction. A part of the body near the first end portion is a root portion. The body has at least one slot that extends from the root portion towards the second end, forming at least two swing pieces that can swing freely relative to the root portion. Each swing piece has a movable contact fixed on one surface near the free end of the swing piece. Each swing piece has an extension portion extending away from the movable contact at its free end. The push card has at least two retention slots arranged in parallel and penetrating through a thickness direction. The extension portions of the swing pieces are respectively fitted into the corresponding retention slots. One of the swing pieces has a flanged structure on both sides of its extension portion, and a distance between the flanged structure and the corresponding inner wall of the retention slot is less than a distance between a side of the extension portion without the flanged structure and the corresponding inner wall of the retention slot. This allows the flanged structure to contact the retention slot, reducing the generation of shavings between the swing piece and the push card in the width direction of the body during the swinging of the swing piece.

[0088] According to one embodiment of this disclosure, the flanged structure is arc-shaped.

[0089] According to one embodiment of this disclosure, a number of the swing pieces is odd, and the flanged structure is provided on the extension portion of the swing piece at the middle among the multiple swing pieces.

[0090] According to one embodiment of this disclosure, a sum of the distances between the two flanged structures on the sides of the extension portion and the corresponding inner walls of the retention slot is less than the distance between either side of the extension portion without the flanged structure and the corresponding inner wall of the retention slot.

[0091] According to one embodiment of this disclosure, the movable contact piece includes multiple piece bodies stacked together, and the swing piece and extension portion include multiple piece bodies stacked together. The flanged structure is provided on one of the piece bodies.

[0092] According to one embodiment of this disclosure, the flanged structure is provided on the piece body at the outermost, and the two sides of the flanged structure are bent towards the adjacent piece body. The adjacent piece body has a clearance structure on both sides.

[0093] According to one embodiment of this disclosure, each swing piece has a shoulder extending along the length direction of the body near the extension portion on each piece body, and one of the piece bodies has a longer shoulder than the others. This ensures that during the operation of the movable contact piece, only the piece body with the longer shoulder contacts the push card in the thickness direction of the push card, thereby reducing the generation of shavings between the movable contact piece and the push card in the thickness direction during the swinging of the movable contact piece.

[0094] According to one embodiment of this disclosure, piece body at the outermost has a longer shoulder.

[0095] According to one embodiment of this disclosure, the movable contact piece includes a first piece body, a second piece body, a third piece body, and a fourth piece body stacked together in sequence. The first piece body, the second piece body, and the third piece body each has an extension portion, while the fourth piece body does not have an extension portion.

[0096] According to one embodiment of this disclosure, each swing piece has a shoulder extending along the length direction of the body near the extension portion on the first piece body, the second piece body, and the third piece body, and the shoulder on the first piece body is longer than the shoulders on the second and third piece body. This ensures that during the operation of the movable contact piece, only the first piece body contacts the push card in the thickness direction of the push card, thereby reducing the generation of shavings between the movable contact piece and the push card in the thickness direction during the swinging of the movable contact piece.

[0097] According to one embodiment of this disclosure, the first piece body, the second piece body, and the third piece body of each swing piece have a U-shaped portion between the movable contact and the root portion, with the opening of the U-shaped portion facing away from the surface of the piece body with the movable contact.

[0098] According to one aspect of this disclosure, an electromagnetic relay includes the connecting structure of movable contact piece and push card as described above.

[0099] Compared with the related technology, the beneficial effects of this disclosure are as follows: 1.In this disclosure, one of the swing pieces has a flanged structure on both sides of its extension portion, and the distance between the flanged structure and the corresponding inner wall of the retention slot is less than the distance between the side of the extension portion without the flanged structure and the corresponding inner wall of the retention slot. This structure of this disclosure allows the flanged structure of the movable contact piece to contact the push card, reducing the generation of shavings between the movable contact piece and the push card in the width direction of the body of the movable contact piece during the swinging of the movable contact piece. 2.Furthermore, in this disclosure, the first piece body, the second piece body, and the third piece body of the swing piece have a shoulder near the extension portion, and the shoulder on the first piece body is higher than those on the second and third piece bodies. This structure of this disclosure ensures that during the operation of the movable contact piece, only the first piece body contacts the push card in the thickness direction of the push card, thereby reducing the generation of shavings between the movable contact piece and the push card in the thickness direction during the swinging of the movable contact piece.

[0100] The following is a further detailed description of this disclosure in conjunction with the drawings and embodiments; however, the connecting structure of movable contact piece and push card and the electromagnetic relay of this disclosure are not limited to the embodiments.Embodiment Four

[0101] In the connecting structure of movable contact piece and push card of this disclosure, the movable contact piece includes a body, an extension portion, and a connecting piece. The body has opposite sides along its width direction. The part of the body near the first end portion is the root portion. The body has at least one slot that extends from the root portion towards the second end, forming at least two swing pieces that can swing freely relative to the root portion. Each swing piece has a movable contact fixed on one surface near the free end of the swing piece. Each swing piece has an extension portion extending away from the movable contact at its free end.

[0102] The push card has at least two retention slots arranged in parallel and penetrating through the thickness direction. The extension portions of the swing pieces are respectively fitted into the corresponding retention slots.

[0103] One of the swing pieces has a flanged structure on both sides of its extension portion, and the distance between the flanged structure and the corresponding inner wall of the retention slot is less than the distance between the side of the extension portion without the flanged structure and the corresponding inner wall of the retention slot. This allows the flanged structure to contact the retention slot, reducing the generation of shavings between the swing piece and the push card in the width direction of the body during the swinging of the swing piece.

[0104] Referring to FIG. 13 to FIG. 16, in this embodiment, three are swing pieces, and the movable contact piece is a movable contact piece with three-contact. In other embodiments, the number of swing pieces can be other odd numbers of swing piece.

[0105] The body 1b of the movable contact piece has two slots extending upwards from the root portion, forming three swing pieces 11b, 12b, and 13b that can swing freely relative to the root portion (see FIG. 20). Each swing piece has a movable contact 3b fixed on one surface near its free end. The free ends of the three swing pieces have extension portions 111b, 121b, and 131b extending away from the movable contact 3b. The push card 2b has three retention slots 21b, 22b, and 23b arranged in parallel and penetrating through the thickness direction T. The extension portions 111b, 121b, and 131b of the three swing pieces are respectively fitted into the corresponding retention slots 21b, 22b, and 23b. Herein, the thickness direction T of the push card 2b is consistent with the length direction L of the body 1b of the movable contact piece. The extension portion 121b of the middle swing piece 12b among the three swing pieces has a flanged structure 1211b on both sides, and the distance between the flanged structure 1211b and the corresponding inner wall of the corresponding retention slot 22b is less than the distance between the sides of the extension portions 111b and 131b of the two side swing pieces 11b and 13b and the corresponding inner walls of the corresponding retention slots 21b and 23b, respectively. This allows the flanged structure 1211b of the movable contact piece to contact the push card 2b, reducing the generation of shavings between the movable contact piece and the push card 2b in the width direction W during the swinging of the movable contact piece.

[0106] In this embodiment, the sum of the distances between the two flanged structures 1211b on the sides of the extension portion 121b of the middle swing piece 12b and the corresponding inner wall of the corresponding retention slot 22b is less than the distance between either side of the extension portions 111b and 131b of the two side swing pieces 11b and 13b and the corresponding inner walls of the corresponding retention slots 21b and 23b. Specifically, the distance between the two flanged structures 1211b on the sides of the extension portion 121b of the middle swing piece 12b and the corresponding inner wall of the corresponding retention slot 22b is 0.1 mm, while the distance between the sides of the extension portions 111b and 131b of the two side swing pieces 11b and 13b and the corresponding inner walls of the corresponding retention slots 21b and 23b is 0.3 mm each.

[0107] In this embodiment, the movable contact piece includes multiple piece bodies stacked together. The flanged structure 1211b is provided on the outermost piece body (first piece body 14b), and the two sides of the flanged structure 1211b are bent towards the second piece body 15b. The second piece body 15b has a clearance structure 1212b on both sides.

[0108] In this embodiment, the movable contact piece includes four piece bodies stacked together. The first piece body 14b, the second piece body 15b, and the third piece body 16b each has an extension portion, while the fourth piece body 17b does not have an extension portion.

[0109] In this embodiment, as shown in FIG. 16, the three swing pieces have shoulders 141b, 151b, and 161b extending along the length direction L of the body 1 near the extension portion on the first piece body 14b, the second piece body 15b, and the third piece body 16b, respectively. The shoulder 141b on the first piece body 14b is longer than the shoulders 151b and 161b on the second piece body 15b and the third piece body 16b. This ensures that during the operation of the movable contact piece, only the first piece body 14b contacts the push card 2b in the thickness direction T (see FIG. 15) of the push card 2b, thereby reducing the generation of shavings between the movable contact piece and the push card 2b in the thickness direction T during the swinging of the movable contact piece.

[0110] In this embodiment, the three swing pieces have a U-shaped portion 18b between the movable contact 3b and the root portion on the first piece body 14b, the second piece body 15b, and the third piece body 16b. The opening of the U-shaped portion 18b faces away from the surface of the piece body 14b with the movable contact.

[0111] Referring to FIG. 17, the electromagnetic relay of this disclosure includes the connecting structure of movable contact piece and push card as described above, a static contact piece 51b, a static contact 52b, a movable lead-out piece 4b, a magnetic circuit part 6b, and an armature assembly 7b. A first armature, a second armature, and a permanent magnet of the armature assembly 7b are combined into an I-shaped structure through a plastic part. The yoke 61b of the magnetic circuit part 6b is fitted at the openings on both sides of the I-shaped structure of the armature assembly 7b. The static contact 52b is fixed at one end of the static contact piece 51b, and the other end of the static contact piece 51b usually extends outside the housing of the relay as a lead-out part. One end of the movable contact piece is fixed with the movable contact 3b, and the other end of the movable contact piece is fixed with one end of the movable lead-out piece 4b. The other end of the movable lead-out piece 4b extends outside the housing of the relay as a lead-out part. The movable contact 3b and the static contact 52b are positioned to cooperate with each other. The armature assembly 7b is fitted at one end of the push card 2b through a plastic push arm 71b, and the other end of the push card 2b is fitted with the movable contact piece.

[0112] The connecting structure of movable contact piece and push card and the electromagnetic relay of this disclosure have a flanged structure 1211b on both sides of the extension portion of one of the swing pieces, and the distance between the flanged structure 1211b and the corresponding inner wall of the corresponding retention slot is less than the distance between the side of the extension portion without the flanged structure and the corresponding inner wall of the corresponding retention slot. This structure of this disclosure allows the flanged structure of the movable contact piece to contact the push card, reducing the generation of shavings between the movable contact piece and the push card in the width direction W of the body of the movable contact piece during the swinging of the movable contact piece.

[0113] The connecting structure of movable contact piece and push card and the electromagnetic relay of this disclosure have shoulders 141b, 151b, and 161b near the extension portion on the first piece body 14b, the second piece body 15b, and the third piece body 16b of the three swing pieces, respectively. The shoulder 141b on the first piece body 14b is longer than the shoulders 151b and 161b on the second piece body 15b and the third piece body 16b. This structure of this disclosure ensures that during the operation of the movable contact piece, only the first piece body 14b contacts the push card 2b in the thickness direction T of the push card 2b, thereby reducing the generation of shavings between the movable contact piece and the push card 2b in the thickness direction T during the swinging of the movable contact pieceEmbodiment Five

[0114] Referring to FIG. 18 and FIG. 19, the connecting structure of movable contact piece and push card and the electromagnetic relay of this disclosure differ from Embodiment Four in that the movable contact piece is a movable contact piece with two-contact. The body 1b of the movable contact piece has one slot forming two swing pieces 11b and 12b capable of swinging freely relative to the root portion. The free ends of the two swing pieces have extension portions 111b and 121b, respectively. The push card 2b has two retention slots 21b and 22b arranged in parallel and penetrating through the thickness direction T. The extension portions 111b and 121b of the two swing pieces are respectively fitted into the corresponding retention slots 21b and 22b. The extension portion 121b of swing piece 12b has a flanged structure 1211b on both sides.Embodiment Six

[0115] Referring to FIG. 20 and FIG. 21, the connecting structure of movable contact piece and push card and the electromagnetic relay of this disclosure differ from Embodiment Four in that the movable contact piece is a movable contact piece with five-contact. The body 1b of the movable contact piece has four slots forming five swing pieces 11b, 12b, 13b, 19b, and 20b capable of swinging freely relative to the root portion. The free ends of the five swing pieces have extension portions 111b, 121b, 131b, 191b, and 201b, respectively. The push card 2b has five retention slots 21b, 22b, 23b, 24b, and 25b arranged in parallel and penetrating through the thickness direction T. The extension portions 111b, 121b, 131b, 191b, and 201b of the five swing pieces are respectively fitted into the corresponding retention slots 21b, 22b, 23b, 24b, and 25b. The extension portion 121b of swing piece 12b has a flanged structure 1211b on both sides.

[0116] In addition, in one type of high-current magnetic latching relay and its contact assembly in the related technology, the second end portion of the movable contact piece forms at least one rib. The rib can be formed on the first piece body, can be stacked on the first piece body and the second piece body, or can be stacked on the first piece body, the second piece body, and the third piece body to enhance the rigidity of the second end portion. The rib is located between the movable contact and the push card, with its length direction consistent with the length direction of the movable contact piece. The second end portion of the movable contact piece has a slit extending outward in the length direction, thereby separating the two movable contacts at the second end portion of the movable contact piece.

[0117] Although this structure can enhance the rigidity of the piece body through the rib, the presence of a rib on each movable contact piece results in uniform flexibility for each movable contact piece. When the push card pulls and separates the contacts, all movable contacts and corresponding static contacts are separated simultaneously. In some specific applications, this simultaneous separation does not meet the requirements.

[0118] This disclosure also provides a movable contact piece with multi-contact and an electromagnetic relay. By providing a rib on some swing pieces and not on others, the rib can enhance the rigidity of the swing pieces with the rib, enabling sequential separation of multiple movable contacts and corresponding static contacts during the separation process.

[0119] According to one aspect of this disclosure, a movable contact piece with multi-contact includes a body. The body has opposite first and second end portions along its length direction and opposite sides along its width direction. A part of the body near the first end portion is a root portion. The body has at least one slot that extends from the root portion towards the second end, forming at least two swing pieces that can swing freely relative to the root portion. Each swing piece has a movable contact fixed on one surface near its free end. At least one of the swing pieces has an extension portion extending away from the movable contact at its free end to cooperate with a retention slot of the push card. Some of the swing pieces have a rib between the movable contact and the root portion to enhance the rigidity of the swing piece, allowing for sequential separation of multiple movable contacts and corresponding static contacts during the separation process.

[0120] According to one embodiment of this disclosure, a number of swing pieces is odd, and the extension portion is provided on the swing piece at the middle among the multiple swing pieces.

[0121] According to one embodiment of this disclosure, the swing piece with the extension portion does not have a rib; the swing piece without the extension portion has a rib.

[0122] According to one embodiment of this disclosure, the extension portion has a flanged structure on both sides to reduce the friction between the movable contact piece and the push card and thereby reduce the generation of shavings.

[0123] According to one embodiment of this disclosure, the rib is strip-shaped.

[0124] According to one embodiment of this disclosure, the rib is located in the middle of the width direction of the swing piece.

[0125] According to one embodiment of this disclosure, the rib is a protrusion formed by a depression on one surface of the swing piece having the movable contact and protruding from the other surface.

[0126] According to one embodiment of this disclosure, a pressure spring is connected to the side of at least two swing pieces away from the movable contact. The root portion of the pressure spring is fixed on the swing pieces where the movable contacts are fixed. The end of the pressure spring is forked into at least two branches, each extending to the corresponding retention slot of the push card.

[0127] According to one embodiment of this disclosure, the body includes multiple piece bodies stacked together. The flanged structure is provided on the outermost first piece body, and the two sides of the flanged structure are bent towards the adjacent piece body. The adjacent piece body has a clearance structure on both sides.

[0128] According to one embodiment of this disclosure, the movable contact on the swing piece with the extension portion is offset from the movable contacts on the other swing pieces in the length direction of the body, and the movable contact on the swing piece with the extension portion is larger than the movable contacts on the other swing pieces.

[0129] According to another aspect of this disclosure, an electromagnetic relay includes the movable contact piece with multi-contact as described above.

[0130] Compared with the related technology, the beneficial effects of this disclosure are as follows: 1.In this disclosure, at least one of the swing pieces has an extension portion at its free end to cooperate with the retention slot of the push card. Some swing pieces also have a rib between the movable contact and the root portion. The rib enhances the rigidity of the swing piece. The stronger the rigidity of the piece body, the smaller the deformation. Other swing pieces do not have rib; thus, this disclosure includes swing pieces with different rigidities. During the separation process from the closed state to the open state of each movable contact and corresponding static contact, the swing piece with the rib has a larger deformation energy and faster separation speed due to its higher rigidity, and the contact gap between the movable contact and corresponding static contact is larger after separation. Meanwhile, the swing piece without the rib has a smaller deformation energy and slower separation speed due to its relatively lower rigidity, and contact gap between the movable contact and corresponding static contact is smaller after separation. Thus, this disclosure can achieve sequential separation, and the contact gap between each movable contact and corresponding static contact is different after separation. In practical use, only the contact gap (minimum gap) between the movable contact and corresponding static contact on the swing piece without the rib needs to be measured. The contact gap on the swing piece with the rib does not need to be measured, which can further simplify the process control points. 2.The swing piece with the extension portion does not have a rib and has lower rigidity. The swing piece without the extension portion has a rib and higher rigidity. When multiple closed movable and static contacts are separated, the movable contact and corresponding static contact on the swing piece with the rib separate first. The movable contact and corresponding static contact on the swing piece without the rib separate later. This ensures that when multiple movable and static contacts are separated instantaneously, an electric arc is only generated between the movable contact and static contact on the swing piece without the rib, and no electric arc is generated between the movable contact and static contact on the swing piece with the rib. This is conducive to reducing the resistance temperature rise, thereby reducing the relay temperature rise and extending the service life. 3.In this disclosure, the extension portion has a flanged structure on both sides to reduce the friction between the movable contact piece and the push card and thereby reduce the generation of shavings. This structure of this disclosure allows the flanged structure of the movable contact piece to contact the push card, reducing the friction between the movable contact piece and the push card during the swinging of the movable contact piece, thereby reducing the generation of shavings. 4.In this disclosure, a pressure spring is connected to the side of the three swing pieces away from the movable contact. The root portion of the pressure spring is respectively fixed at the three movable contact fixing points on the swing pieces. The end of the pressure spring is forked into three branches, each extending to the corresponding retention slot of the push card. This structure of this disclosure eliminates the need for auxiliary positioning, reduces the number of parts used, and thereby reduces the cost.

[0131] The following is a further detailed description of this disclosure in conjunction with the drawings and embodiments; however, the movable contact piece with multi-contact and electromagnetic relay of this disclosure are not limited to the embodimentsEmbodiment Seven

[0132] The movable contact piece with multi-contact of this disclosure includes a body. The body has opposite sides along its width direction. A part of the body near the first end portion is a root portion. The body has at least one slot that extends from the root portion towards the second end, forming at least two swing pieces that can swing freely relative to the root portion. Each swing piece has a movable contact fixed on one surface near its free end. At least one of the swing pieces has an extension portion extending away from the movable contact at its free end to cooperate with a retention slot of the push card. Some of the swing pieces have a rib between the movable contact and the root portion to enhance the rigidity of the swing piece, allowing for sequential separation of multiple movable contacts and corresponding static contacts during the separation process.

[0133] Referring to FIG. 22 to FIG. 26, in this embodiment, the number of the swing pieces is odd, and the movable contact piece is a movable contact piece with three-contact. In other embodiments, the number of the swing pieces can be other odd numbers.

[0134] The movable contact piece with three-contact includes a body 1c. The body 1c has two slots forming three swing pieces 11c, 12c, and 13c capable of swinging freely relative to the root portion. Each swing piece has a movable contact fixed on one surface near its free end. The middle swing piece 12c among the three swing pieces has an extension portion 121c extending away from the movable contact 32c to cooperate with the retention slot of the push card 2c. The two side swing pieces 11c and 13c have a rib 18c between the movable contact and the root portion to enhance their rigidity, making it greater than that of the middle swing piece 12c. This allows for sequential separation of the movable contacts 31c and 33c on the side swing pieces 11c and 13c from the corresponding static contacts before the movable contact 32c on the middle swing piece 12c separates from its corresponding static contact. After separation, the contact gaps between the movable contacts 31c and 33c and their corresponding static contacts are greater than the contact gap between the movable contact 32c and its corresponding static contact.

[0135] In this embodiment, the extension portion 121c has a flanged structure 141c on both sides to reduce the friction between the movable contact piece 1c and the push card 2c and thereby reduce the generation of shavings.

[0136] In this embodiment, the rib 18c is strip-shaped.

[0137] In this embodiment, the two ribs 18c are respectively located in the middle of the width direction W of the swing pieces 11c and 13c.

[0138] In this embodiment, the rib 18c is a protrusion formed by a depression on one surface of the swing pieces 11c and 13c having the movable contacts 31c and 33c and protruding from the other surface.

[0139] In this embodiment, a pressure spring 4c is connected to the side of the three swing pieces 11c, 12c, and 13c away from the movable contact. The root portion of the pressure spring 4c is fixed at the swing pieces where the movable contacts 31c, 32c, and 33c are fixed. The end of the pressure spring 4c is forked into three branches, each extending to the corresponding retention slot of the push card 2c.

[0140] In this embodiment, the body 1c includes multiple piece bodies stacked together. The flanged structure 141c is provided on the outermost first piece body 14c, and the two sides of the flanged structure are bent towards the adjacent second piece body 15c. The adjacent second piece body 15c has a clearance structure 151c on both sides.

[0141] In this embodiment, the body 1c includes four piece bodies stacked together: the first piece body 14c, the second piece body 15c, the third piece body 16c, and the fourth piece body 17c. The first piece body 14c, the second piece body 15c, and the third piece body 16c each has a corresponding extension portion, while the fourth piece body 17c does not have an extension portion.

[0142] In this embodiment, the first piece body 14c, the second piece body 15c, and the third piece body 16c of the three swing pieces have a U-shaped portion 19c between the movable contact and the root portion, with the opening of the U-shaped portion 19c facing away from the surface of the piece body with the movable contact. The rib 18c is provided on the fourth piece body 17c.

[0143] In this embodiment, the movable contact 32c on the middle swing piece 12c among the three swing pieces is offset from the movable contacts 31c and 33c on the two side swing pieces 11c and 13c along the length L of the body 1c, and the movable contact 32c is larger than the movable contacts 31c and 33c on the two side swing pieces 11c and 13c.

[0144] Referring to FIG. 27, the electromagnetic relay of this disclosure includes the movable contact piece with multi-contact as described in the above embodiment, a static contact piece 51c, a static contact 52c, a magnetic circuit part 6c, an armature assembly 7c, and a movable lead-out piece 8c. A first armature, a second armature, and a permanent magnet of the armature assembly 7c are combined into an I-shaped structure through a plastic part. The yoke of the magnetic circuit part 6c is fitted at the openings on both sides of the I-shaped structure of the armature assembly 7c. The static contact 52c is fixed at one end of the static contact piece 51c, and the other end of the static contact piece 51c usually extends outside the housing of the relay as a lead-out part. One end of the movable contact piece is fixed with the movable contact, and the other end of the movable contact piece is fixed with one end of the movable lead-out piece 8c. The other end of the movable lead-out piece 8c also extends outside the housing of the relay as a lead-out part. The movable contact and the static contact 52c are positioned to cooperate with each other. The armature assembly 7c is fitted at one end of the push card 2c through a plastic push arm 71c, and the other end of the push card 2c is fitted with the movable contact piece.

[0145] In the movable contact piece with multi-contact and electromagnetic relay of this disclosure, some of the swing pieces have a rib 18c between the movable contact and the root portion to enhance the rigidity of the swing piece, while the other part of the swing pieces does not have a rib 18c. This structure of this disclosure allows for sequential separation of each movable contact and corresponding static contact during the separation process from the closed state to the open state. The swing piece with the rib 18c has a larger deformation energy and faster separation speed due to its higher rigidity, and the between the movable contact and corresponding static contact is larger contact gap after separation. Meanwhile, the swing piece without the rib 18c has a smaller deformation energy and slower separation speed due to its relatively lower rigidity, and contact gap between the movable contact and corresponding static contact is smaller after separation. Thus, this disclosure can achieve sequential separation, and the contact gap between each movable contact and corresponding static contact is different after separation. In practical use, only the contact gap (minimum gap) between the movable contact and corresponding static contact on the swing piece without the rib 18c needs to be measured. The contact gap on the swing piece with the rib 18c does not need to be measured, which can further simplify the process control points.

[0146] In the movable contact piece with multi-contact and electromagnetic relay of this disclosure, the extension portion has a flanged structure 141c on both sides to reduce the friction between the movable contact piece 1c and the push card 2c and thereby reduce the generation of shavings. This structure of this disclosure allows the flanged structure of the movable contact piece to contact the push card, reducing the friction between the movable contact piece and the push card during the swinging of the movable contact piece, thereby reducing the generation of shavings.

[0147] In the movable contact piece with multi-contact and electromagnetic relay of this disclosure, a pressure spring 4c is connected to the side of the three swing pieces 11c, 12c, and 13c away from the movable contact. The root portion of the pressure spring 4c is fixed at the swing pieces where the movable contacts are fixed. The end of the pressure spring 4c is forked into three branches, each extending to the corresponding retention slot of the push card 2c. This structure of this disclosure eliminates the need for auxiliary positioning, reduces the number of parts used, and thereby reduces the cost.Embodiment Eight

[0148] Referring to FIG. 28 and FIG. 29, the movable contact piece with multi-contact and electromagnetic relay of this disclosure differ from Embodiment Seven in that the movable contact piece is a movable contact piece with two-contact. The body 1c has one slot forming two swing pieces 11c and 12c capable of swinging freely relative to the root portion. The extension portion 121c is provided on swing piece 12c, and swing piece 11c has a rib 18c. The movable contact 32c on swing piece 12c is offset from the movable contact 31c on swing piece 11c along the length direction L of the body 1c, and the movable contact 32c is larger than the movable contact 31c.Embodiment Nine

[0149] Referring to FIG. 30 and FIG. 31, the movable contact piece with multi-contact and electromagnetic relay of this disclosure differ from Embodiment Seven in that the movable contact piece is a movable contact piece with five-contact. The body 1c has four slots forming five swing pieces 11c, 12c, 13c, 20c, and 21c capable of swinging freely relative to the root portion. The extension portion 121c is provided on swing piece 12c, and swing pieces 11c, 13c, 20c, and 21c each has a rib 18c. The movable contact 32c on swing piece 12c is offset from the movable contacts 31c, 33c, 34c, and 35c on the two side swing pieces 11c, 13c, 20c, and 21c along the length direction L of the body 1c, and the movable contact 32c is larger than the movable contacts 31c, 33c, 34c, and 35c.

[0150] It should be understood that this disclosure does not limit its application to the detailed structure and layout of the components proposed in this specification. This disclosure can have other embodiments and can be implemented and performed in various ways. The aforementioned variations and modifications fall within the scope of this disclosure. It should be understood that the disclosure and definition of this specification extend to all alternative combinations of two or more individual features mentioned or evident in the text and / or drawings. All these different combinations constitute multiple alternative aspects of this disclosure. The embodiments of this specification illustrate the best-known ways to implement this disclosure and will enable those skilled in the art to utilize this disclosure.

Claims

1. A movable contact piece with multi-contact, comprising: a body having opposite first surface and second surface, opposite first end portion and second end portion along a length direction of the body, and opposite sides along a width direction of the body, a part of the body near the first end portion being a root portion, the body having at least one slot extending from the root portion towards the second end, forming at least two swing pieces swinging freely relative to the root portion, each swing piece having a movable contact fixed on one of the first surface and second surface near a free end of the swing piece, wherein at least one of the at least two swing pieces has an extension portion extending away from the movable contact at the free end to cooperate with a retention slot of the push card, at least one of the at least two swing pieces is fixed with a connecting piece, the connecting piece comprising a piece body and an elastic arm extending along the width direction of the body of the movable contact piece, the elastic arm abutting against remaining swing pieces other than the swing piece fixed with the connecting piece, a contact gap between the movable contact on the swing piece and the corresponding static contact being adjustable by regulating a pressure exerted by the elastic arm on the swing piece.

2. The movable contact piece with multi-contact according to claim 1, wherein a number of the swing pieces is odd, the extension portion is provided on a middle swing piece among the swing pieces, and the connecting piece has two elastic arms, each abutting against the swing pieces on both sides.

3. The movable contact piece with multi-contact according to claim 1 or 2, wherein the extension portion has a flanged structure on both sides to reduce friction between the movable contact piece and the push card so as to reduce shavings.

4. The movable contact piece with multi-contact according to claim 1, wherein the piece body of the connecting piece is fixed on a surface of the swing piece provided with the extension portion.

5. The movable contact piece with multi-contact according to claim 4, wherein the piece body of the connecting piece extends along a direction from the root portion of the body towards the second end of the body and is flush with the extension portion.

6. The movable contact piece with multi-contact according to claim 4, wherein an end of the piece body of the connecting piece has a limit bend.

7. The movable contact piece with multi-contact according to claim 5, wherein the piece body of the connecting piece has a bend portion between the movable contact and the limit bend.

8. The movable contact piece with multi-contact according to claim 1, wherein the elastic arm of the connecting piece has at least one pair of V-shaped portions with opposite opening directions; wherein an unfolded planar shape of the V-shaped portion is trapezoidal.

9. The movable contact piece with multi-contact according to claim 3, wherein the body comprises multiple piece bodies stacked together, and the swing piece comprises multiple piece bodies stacked together; the flanged structure is provided on an outermost piece body, and the two sides of the flanged structure are bent towards adjacent piece body, and the adjacent piece body has a clearance structure on both sides.

10. The movable contact piece with multi-contact according to claim 1, wherein the movable contact on the swing piece fixed with the connecting piece is offset from the movable contacts on other swing pieces in the length direction of the body, and the movable contact on the swing piece fixed with the connecting piece is larger than the movable contacts on other swing pieces, and the width of the swing piece fixed with the connecting piece is greater than the widths of other swing pieces.

11. The movable contact piece with multi-contact according to claim 1, wherein a number of the swing pieces is two, the extension portion is provided on one of the swing pieces, and the connecting piece has one elastic arm, the elastic arm extending towards and abutting against another swing piece.

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

Images