relay

Abstract

The application relates to a relay, comprising: a normally open static spring provided with a normally open static contact; a dynamic spring provided with a normally open dynamic contact; a stopper comprising a first stopper unit part and a second stopper unit part, the first stopper unit part extends along a first direction, the second stopper unit part is bent relative to the first stopper unit part to form a second direction and extends along a third direction, and is located on a side of the dynamic spring away from the normally open static contact, the second stopper unit part is provided with a protruding part facing the normally open dynamic contact at a position corresponding to the normally open dynamic contact, and the protruding part is configured to prevent the relay from being damaged or malfunctioning under the action of gravity of the dynamic spring when the relay is in an unexcited state. The application can reduce cost, reduce process difficulty, make the dynamic spring have anti-vibration performance, and reduce time cost waste caused by product reform.

Description

Technical Field

[0001] This application relates to the field of electrical control devices, and in particular to relays. Background Technology

[0002] Changeover relays are mainly used in security (video surveillance, access control, video intercom, etc.), fire protection (fire alarms, emergency lighting, etc.), and communications. Currently, based on market understanding, many customers only use normally open contacts (normally open contacts) in these applications. In this scenario, normally closed contact groups (including...) are often used in other applications. Figure 1 The presence of the normally closed stationary contact 801 of the normally closed stationary spring 800 and the normally closed moving contact 212 of the moving spring 210 not only increases manufacturing costs but also raw material costs. Furthermore, the presence of the normally closed stationary spring lead-out pin 802 of the normally closed stationary spring 800 adds extra complexity to PCB routing. Therefore, the current method for reducing costs is generally to remove the normally closed stationary spring. However, relays without the normally closed stationary spring exhibit a noticeable performance reduction during use. Utility Model Content

[0003] Based on this, in response to at least one of the aforementioned technical problems, a relay is provided that can reduce costs while preventing the moving spring from swinging due to bumps or vibrations, thereby preventing damage or malfunction of the relay.

[0004] This application provides a relay, comprising: a normally open stationary spring having a normally open stationary contact; a moving spring having a normally open moving contact; and a stop member comprising a first stop member unit portion and a second stop member unit portion, the first stop member unit portion extending along a first direction, the second stop member unit portion being bent relative to the first stop member unit portion in a second direction and extending along a third direction, and located on the side of the moving spring away from the normally open stationary contact, the second stop member unit portion having a protrusion facing the normally open moving contact at a position corresponding to the normally open moving contact, the protrusion being configured such that: when the relay is in an unenergized state, under the action of the gravity of the moving spring, the protrusion contacts the side of the moving spring away from the normally open stationary contact and has contact pressure.

[0005] Preferably, the second stop member unit is bent in a direction closer to the normally open contact at a position corresponding to the normally open contact to form the protrusion.

[0006] Preferably, the bends of the first stop unit and the second stop unit are provided with reinforcing structures.

[0007] Preferably, in the third direction, the end of the second stop member unit portion away from the first stop member unit portion is provided with a chamfer.

[0008] Preferably, the relay further comprises: a coil frame; an iron core extending along the third direction and passing through the coil frame; and a coil wound on the coil frame and capable of generating a magnetic field on the iron core.

[0009] Preferably, the relay further includes an L-shaped yoke and an L-shaped armature assembly; the L-shaped yoke has a yoke blade; the L-shaped armature assembly is mounted to the base and includes: an L-shaped armature and a push block; the L-shaped armature includes: a magnetic attraction part, which is disposed corresponding to the iron core and pressed at the yoke blade; a push part, which is located between the moving spring and the coil, and the push block is disposed on the push part; wherein, the magnetic field generated by the coil can attract the magnetic attraction part, so that the L-shaped armature assembly rotates around the yoke blade, thereby causing the push block to contact the moving spring and push the moving spring.

[0010] Preferably, when the relay is in an unenergized state, the protrusion of the stop member is higher than the highest point of the push block of the L-shaped armature assembly.

[0011] Preferably, the relay further includes a compression spring capable of applying pressure to the L-shaped armature to press the L-shaped armature against the yoke blade.

[0012] Preferably, the end of the moving spring with the normally open contact is bent toward the protrusion.

[0013] Preferably, the relay further includes a base, and the normally open stationary spring, the moving spring, the stop member and the compression spring are mounted on the base; and / or, the relay is provided with a normally open stationary spring lead-out pin connected to the normally open stationary spring and a moving spring lead-out pin connected to the moving spring, and the stop member is not provided with a lead-out pin.

[0014] The above-mentioned relay has the following beneficial effects:

[0015] (1) When the coil of the relay is not energized, the protrusion contacts the side of the moving spring away from the normally open stationary contact and has contact pressure, thereby preventing the moving spring from swinging due to bumps or vibrations, thus preventing the relay from being damaged or malfunctioning.

[0016] (2) By replacing the original normally closed stationary contact and normally closed moving contact with the protrusion, not only is the material cost of the contact, which accounts for a high proportion of the product cost, saved, but the welding steps of the normally closed stationary contact and normally closed moving contact can also be eliminated in the contact welding process, which is difficult to process. Furthermore, the configuration of the protrusion allows the original production line used to produce two sets of changeover relays to produce the relay of this application with almost no adjustment, reducing the mold, equipment and time costs invested due to the production of different specifications. That is, it can be compatible with the production and manufacturing process of changeover relays.

[0017] (3) The overtravel can be adjusted by adjusting the height of the protrusion to meet different specifications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of two sets of traditional changeover relays.

[0019] Figure 2 A schematic diagram of the relay structure after the normally closed stationary spring is removed, concealed in the housing and base.

[0020] Figure 3 for Figure 2 Cross-sectional view.

[0021] Figure 4 This is a schematic diagram of the relay structure of this application after the housing is removed.

[0022] Figure 5 for Figure 4 A schematic diagram of the structure after the base is hidden.

[0023] Figure 6 for Figure 5 Cross-sectional view.

[0024] Figure 7 for Figure 5 A magnified view of a portion of point A in the middle.

[0025] Figure 8 for Figure 6 A magnified view of a section at point B.

[0026] Figure 9 This is a schematic diagram of the stop component in this application.

[0027] Figure 10 This is a schematic diagram of the relay structure of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 110. Normally open stationary spring; 111. Normally open stationary contact;

[0030] 120. Normally open stationary spring lead-out foot; 121. Step;

[0031] 210. Moving spring; 211. Normally open moving contact; 212. Normally closed moving contact;

[0032] 220. Spring extension foot;

[0033] 300, Stop; 310, First stop unit; 320, Second stop unit; 321, Protrusion; 322, Chamfer; 330, Reinforcing structure;

[0034] 400. Base;

[0035] 510. Iron core; 520. Coil; 521. Coil lead-out terminal;

[0036] 600, L-shaped armature assembly;

[0037] 610. L-shaped armature; 611. Magnetic attraction part; 612. Propulsion part;

[0038] 620. Push block;

[0039] 710. Compression spring; 720. Housing; 730. L-shaped yoke;

[0040] 800, Normally closed stationary spring; 801, Normally closed stationary contact; 802, Normally closed stationary spring lead-out pin. Detailed Implementation

[0041] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0042] The reason for the performance reduction after removing the normally closed stationary spring is that when the coil 520 is de-energized, the L-shaped armature assembly 600 (including the L-shaped armature 610 and the push block 620) descends freely to the bottom under gravity. At this time, the normally open stationary contact 111 disengages from the normally open moving contact 211. After the product stabilizes, the L-shaped armature 610 and the push block 620 do not contact the moving spring 210, and there is a certain gap. If there were no gap between the push block 620 and the moving spring 210, the push block 620 could be used to hold the moving spring 210 in place; that is, the push block 620 would act as a stop structure for the moving spring 210. This requires... Figure 2 and Figure 3The product structure was adjusted in two ways: The first adjustment was to increase the height of the push block 620 to the same height as the moving spring 210. However, this would increase the weight of the push block 620, requiring the coil 520 to generate greater magnetic force to drive the armature. This necessitates a larger coil, increasing material costs and reducing the insulation distance between the coil and contacts. The second adjustment was to move the moving spring 210 and the normally open stationary spring 110 downwards as a whole, so that the moving spring 210 is in contact with the push block 620. In this case, the push block 620 acts as a stop for the moving spring 210. This would bring the normally open moving contact 211 on the moving spring 210 closer to the coil 520, causing the insulation performance between the coil 520 and the product contacts to fail to meet design requirements.

[0043] Therefore, in the solution that removes the normally closed stationary spring, the moving spring 210 of the relay has no stop structure when it is not energized. It does not contact the push block 620 and there is a certain gap, forming a cantilever beam structure. Furthermore, the moving spring 210 is usually made of highly elastic copper. As a result, if the product encounters bumps or vibrations during transportation or customer use, the moving spring 210 of the relay will swing up and down with the normally open moving contact 211. When the swing is severe, it may lead to the following consequences:

[0044] (1) The dynamic spring 210 changes from elastic deformation to plastic deformation, which damages the mechanical parameters of the product.

[0045] (2) When a relay is used in a circuit, and the normally open stationary contact 111 and the normally open moving contact 211 are connected to the load, if the relay is not energized but the normally open stationary contact 111 and the normally open moving contact 211 make contact due to swinging, it will cause abnormal function of the customer's circuit or even damage the circuit.

[0046] The following is combined Figures 4 to 10 The relay according to the implementation scheme of this application is described.

[0047] like Figures 4 to 8 As shown, the relay of this application includes: a normally open stationary spring 110, a moving spring 210, and a stop member 300.

[0048] like Figure 8 As shown, the normally open stationary spring 110 is provided with a normally open stationary contact 111.

[0049] The moving spring 210 is provided with a normally open moving contact 211.

[0050] like Figure 8 and Figure 9As shown, the stop member 300 includes a first stop member unit portion 310 and a second stop member unit portion 320. The first stop member unit portion 310 extends along a first direction (i.e., the z-axis direction), and the second stop member unit portion 320 is formed by bending relative to the first stop member unit portion 310 in a second direction (i.e., the y-axis direction) and extending along a third direction (i.e., the x-axis direction), and is located on the side of the moving spring 210 away from the normally open stationary contact 111. The second stop member unit portion 320 is provided with a protrusion 321 facing the normally open moving contact 211 at a position corresponding to the normally open moving contact 211. Specifically, the first stop member unit portion 310 has a first end and a second end, and the second stop member unit portion 320 is formed by bending from the first end of the first stop member unit portion 310 in the second direction (i.e., the y-axis direction).

[0051] The protrusion 321 is configured as follows:

[0052] When the relay is in an unenergized state, under the gravity of the moving spring 210, the protrusion 321 contacts the side of the moving spring 210 away from the normally open stationary contact 111 and has contact pressure (i.e., the protrusion 321 and the moving spring 210 maintain overtravel), thereby preventing the moving spring 210 from swinging due to bumps or vibrations, thus preventing the relay from being damaged or malfunctioning.

[0053] This application has the following beneficial effects:

[0054] (1) When the coil of the relay is not energized, the protrusion 321 contacts the side of the moving spring 210 away from the normally open stationary contact 111 and has contact pressure, thereby preventing the moving spring 210 from swinging due to bumps or vibrations, thus preventing the relay from being damaged or malfunctioning.

[0055] (2) The protrusion 321 replaces the original normally closed stationary contact and normally closed moving contact, which not only saves on the material cost of contacts, which accounts for a high proportion of the product cost, but also eliminates the welding steps of normally closed stationary contacts and normally closed moving contacts in the contact welding process, which is difficult to process. Furthermore, the configuration of the protrusion 321 allows the original production line used to produce two sets of changeover relays to produce the relay of this application with almost no adjustment, reducing the mold, equipment and time costs invested due to the production of different specifications. That is, it can be compatible with the production process of changeover relays.

[0056] (3) The overtravel can be adjusted by adjusting the height of the protrusion 321 to meet different specifications.

[0057] Furthermore, the relays in this application are two sets of normally open relays.

[0058] like Figure 5As shown, the relay further includes a normally open spring lead 120, which is connected to the normally open spring 110. The normally open spring lead 120 extends along a first direction.

[0059] Furthermore, such as Figure 5 and Figure 7 As shown, the end of the normally open stationary spring lead-out 120 near the normally open stationary spring 110 has a step 121. The distance between the step 121 and the moving spring 210 is the minimum electrical clearance distance from the normally open moving contact 211 to the stop member 300.

[0060] In this article, the first direction refers to the height direction of the relay, the second direction refers to the width direction of the relay, and the third direction refers to the length direction of the relay.

[0061] Furthermore, such as Figure 5 As shown, the relay further includes a moving spring lead 220, which is connected to the moving spring 210. The moving spring lead 220 is L-shaped.

[0062] The movable spring 210 has a connecting portion and a contact portion. The movable spring 210 extends along a third direction (i.e., the x-axis direction). The connecting portion of the movable spring 210 is connected to the movable spring lead-out foot 220. The contact portion of the movable spring 210 has a normally open movable contact 211 fixed thereon and extends between the normally open stationary spring 110 and the second stop unit portion 320. More specifically, the movable spring 210 has a first end and a second end distributed along a third direction. The connecting portion is located at or near the first end of the movable spring 210, and the contact portion is located at the second end of the movable spring 210.

[0063] The movable spring 210 has a normally open movable contact 211 on the side of its contact portion facing the normally open stationary contact 111. The movable spring 210 is rotatable around its connecting portion.

[0064] Furthermore, such as Figure 8 As shown, the second stop member unit 320 is bent towards the normally open contact 211 at a position corresponding to the normally open contact 211 to form the protrusion 321. This protrusion 321, formed by bending, is not only simple in structure and easy to process, but can also be formed in a single stamping without the need for additional components. The protrusion 321 is formed corresponding to the normally open contact 211. The normally open contact 211 of the moving spring 210 moves away from the normally open stationary contact 111, and the moving spring 210 contacts the protrusion 321 of the stop member 300, effectively improving the contact pressure and contact stability when this part contacts the normally open contact 211.

[0065] It is understood that the protrusion 321 is not limited to the above-mentioned method of forming by bending.

[0066] Since the bending angle of the stop member 300 indirectly affects the position of the protrusion 321 after the stop member 300 is assembled, a reinforcing structure 330 can be provided at the bending points of the first stop member unit 310 and the second stop member unit 320 (see also [reference]). Figure 9 The reinforcing structure 330 is used to improve the structural rigidity at the bend, thereby suppressing the springback effect generated after bending and ensuring that the first stop unit 310 and the second stop unit 320 can stably maintain the predetermined bending angle. The reinforcing structure 330 may be a reinforcing rib.

[0067] Compared to the prior art, in this application, since the normally closed stationary contact is no longer needed, and there is no need to leave space for welding the normally closed stationary contact, a chamfer 322 can be provided at the end of the second stop unit 320 away from the first stop unit 310, so that the end becomes an obtuse angle (see reference). Figure 9 Through this improvement, the distance d between step 121 and moving spring 210 is extended, that is, the minimum electrical clearance distance between normally open contact 211 and stop 300 is larger (see details). Figure 7 This not only effectively increases the electrical spacing between key components but also significantly alleviates the charge concentration problem caused by tip discharge. Ultimately, this structure exhibits better dielectric withstand capability in relay withstand voltage tests, reduces the risk of breakdown, and improves the overall insulation safety and long-term operational reliability of the device.

[0068] Furthermore, such as Figure 4 As shown, the relay of this application further includes a base 400, on which a normally open stationary spring 110, a moving spring 210, and a stop member 300 are mounted.

[0069] like Figure 5 As shown, in the third direction (i.e., the x-axis direction), the moving spring lead-out foot 220, the first stop unit 310, and the normally open stationary spring lead-out foot 120 are arranged in sequence.

[0070] like Figure 8 As shown, in the first direction (i.e., the z-axis direction), the moving spring 210 is located between the second stop unit 320 and the normally open stationary spring 110.

[0071] Furthermore, such as Figure 5 and Figure 6 As shown, the relay of this application further includes: a coil frame, an iron core 510, and a coil 520. The coil frame has a through hole. The iron core 510 extends along a third direction and passes through the coil frame. The coil 520 is wound on the coil frame and is capable of generating a magnetic field on the iron core 510.

[0072] Furthermore, such as Figure 6As shown, the coil 520 is provided with a coil lead 521, which serves as the electrical connection interface between the internal coil 520 and the external control circuit. Its typical form can be soldered pins or terminals, which facilitates the connection of the relay to the external control system and realizes precise control of the relay's opening and closing state.

[0073] Furthermore, such as Figure 6 As shown, the relay of this application further includes an L-shaped yoke 730 and an L-shaped armature assembly 600. The L-shaped yoke 730 has a yoke blade. The L-shaped armature assembly 600 is mounted to a base 400 and is rotatable about the yoke blade, and includes an L-shaped armature 610 and a pusher block 620. The L-shaped armature 610 includes a magnetic attraction portion 611 and a pusher portion 612.

[0074] The magnetic attraction part 611 is provided corresponding to the iron core 510 and presses against the yoke blade edge. The portion of the magnetic attraction part 611 that is away from the pushing part 612 (i.e., in...) Figure 6 The lower middle part of the coil 520 is directly opposite the iron core 510, and the magnetic attraction part 611 rotates around the yoke blade under the action of the magnetic field generated by the coil 520.

[0075] The pusher 612 is located between the moving spring 210 and the coil 520. The pusher 612 is provided with a pusher block 620 facing the moving spring 210, which is configured to act directly on the moving spring 210. The L-shaped armature 610 and the pusher block 620 are two parts made of different materials. Specifically, the L-shaped armature 610 is a metal part, and the pusher block 620 is an insulating part to ensure voltage-resistant insulation performance.

[0076] When the coil 520 is energized, it generates a magnetic field in the iron core 510. This magnetic field will produce sufficient electromagnetic attraction on the magnetic attraction part 611 of the L-shaped armature 610 to attract the magnetic attraction part 611, so that the L-shaped armature 610 surrounds the yoke blade along... Figure 6 The rotating block 620 contacts the moving spring 210 and pushes it. Under the push of the block 620, the moving spring 210 moves around its connecting portion (i.e., the connection point between the moving spring 210 and the spring extension leg 220) along... Figure 6 The spring 210 rotates counterclockwise so that the normally open moving contact 211 located at the second end of the moving spring 210 moves closer to the normally open stationary contact 111 and contacts the normally open stationary contact 111 of the normally open stationary spring 110. After the normally open moving contact 211 contacts the normally open stationary contact 111, the switching action is completed.

[0077] Furthermore, when the relay is in an unenergized state, the protrusion 321 of the stop member 300 is higher than the highest point of the push block 620 of the L-shaped armature assembly 600, and its function is as follows:

[0078] (1) This ensures that when the relay is in a stationary state without excitation, the moving spring 210 only contacts the protrusion 321 of the stop member 300, without having the push block 620 of the L-shaped armature assembly 600 act as a stop part and thus sacrificing other performance indicators of the relay.

[0079] (2) This fundamentally avoids the possibility that, in a stationary state, the moving spring 210 simultaneously contacts two independent components: the protrusion 321 of the stop member 300 and the push block 620 of the L-shaped armature assembly 600. If such dual contact occurs, it means that the moving spring 210 is subjected to two independent supporting forces that may have slight differences at the same time, forming an ambiguous force system. This uncertainty directly introduces an additional variable, significantly affecting the stability and consistency of the overtravel parameters between the moving spring 210 and the stop member 300.

[0080] Furthermore, such as Figures 4 to 6 As shown, the relay of this application further includes a compression spring 710, which is mounted to the base 400 and can apply pressure to the L-shaped armature 610 to press the L-shaped armature 610 against the yoke blade edge, thereby fixing and limiting its position.

[0081] Specifically, when the coil 520 is de-energized, the magnetic field it generates disappears, and the electromagnetic attraction acting on the L-shaped armature 610 is immediately released. At this time, under the gravity of the L-shaped armature 610 and the push block 620, the L-shaped armature assembly 600 moves around the yoke blade in the opposite direction to the attraction direction (i.e., Figure 6 The rotor (in a clockwise direction) quickly rotates back to its initial stationary position, i.e., a rapid reset. Further, as... Figure 10 As shown, the relay of this application further includes a housing 720, and a base 400 is mounted inside the housing 720.

[0082] Furthermore, the end of the moving spring 210 with the normally open moving contact 211 is bent towards the protrusion 321 to increase the rigidity of the moving spring 210 and further improve the contact pressure between the moving spring 210 and the protrusion 321. In addition, it can also ensure the gap after the normally open moving contact 211 and the normally open stationary contact 111 are disconnected, improve the withstand voltage, and reduce the gap between the L-shaped armature assembly 600 and the iron core 510, thereby reducing the initial electromagnetic attraction force generated by the coil 520 to drive the L-shaped armature assembly 600, and thus reducing the number of turns of the coil 520.

[0083] like Figure 4 and Figure 5 As shown, the relay is provided with a normally open stationary spring lead-out pin 120 connected to the normally open stationary spring 110 and a moving spring lead-out pin 220 connected to the moving spring 210. The stop member 300 is not provided with a lead-out pin, which eliminates the original normally closed stationary spring lead-out pin and reduces the difficulty of PCB board wiring.

[0084] The coil lead 521, the normally open stationary spring lead 120, and the moving spring lead 220 extend from the housing 720.

[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A relay, characterized in that, include: Normally open stationary spring, which is equipped with normally open stationary contact; The moving spring is equipped with a normally open moving contact; A stop member includes a first stop member unit portion and a second stop member unit portion. The first stop member unit portion extends along a first direction, and the second stop member unit portion is bent relative to the first stop member unit portion in a second direction and extends along a third direction, located on the side of the moving spring away from the normally open stationary contact. The second stop member unit portion has a protrusion facing the normally open moving contact at a position corresponding to the normally open moving contact. The protrusion is configured as follows: When the relay is in an unenergized state, under the action of gravity of the moving spring, the protrusion contacts the side of the moving spring away from the normally open stationary contact and has contact pressure.

2. The relay according to claim 1, characterized in that, The second stop member unit is bent toward the normally open contact at a position corresponding to the normally open contact to form the protrusion.

3. The relay according to claim 1, characterized in that, The first stop unit and the second stop unit are provided with a reinforcing structure at their bends.

4. The relay according to claim 1, characterized in that, In the third direction, the end of the second stop member unit that is away from the first stop member unit is provided with a chamfer.

5. The relay according to claim 1, characterized in that, It further includes: Coil frame; The iron core extends along the third direction and passes through the coil frame; A coil, which is wound on the coil frame, is able to generate a magnetic field on the iron core.

6. The relay according to claim 5, characterized in that, It further includes an L-shaped yoke and an L-shaped armature assembly; The L-shaped yoke has a yoke blade; The L-shaped armature assembly includes: an L-shaped armature and a pusher block; L-shaped armatures include: A magnetic attraction part is provided corresponding to the iron core and is pressed against the yoke blade edge; A pushing part is located between the moving spring and the coil, and a pushing block is disposed on the pushing part; The magnetic field generated by the coil can attract the magnetic attraction part, so that the L-shaped armature assembly rotates around the yoke blade, thereby causing the push block to contact the moving spring and push the moving spring.

7. The relay according to claim 6, characterized in that, When the relay is in an unenergized state, the protrusion of the stop member is higher than the highest point of the push block of the L-shaped armature assembly.

8. The relay according to claim 7, characterized in that, It further includes: A compression spring is provided, which applies pressure to the L-shaped armature to press the L-shaped armature against the yoke blade.

9. The relay according to claim 1, characterized in that, The end of the moving spring with the normally open contact is bent toward the protrusion.

10. The relay according to claim 8, characterized in that, It further includes a base, on which the normally open stationary spring, the moving spring, the stop member, and the compression spring are mounted; and / or, the relay is provided with a normally open stationary spring lead connected to the normally open stationary spring and a moving spring lead connected to the moving spring, and the stop member is not provided with a lead.

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