A modified high-damping composite rubber bearing

Abstract

This invention relates to the field of rubber bearing technology, specifically a modified high-damping composite rubber bearing, comprising a fixed structure, a base plate, a first positioning groove, a docking structure, a docking block, a protrusion, a positioning structure, a laminated structure, a limiting structure, and an energy-absorbing structure. The fixed structure and the docking structure are limited by the limiting structure, which facilitates the installation of the fixed structure on the bridge and the subsequent assembly of the docking structure and the fixed structure. This makes the disassembly of the docking structure more convenient and the inspection and maintenance of the laminated structure more convenient, thus improving the efficiency of inspection and maintenance. The laminated structure is positioned by the positioning structure, which makes the assembly of the laminated structure more convenient and faster. At the same time, the design of the laminated structure improves the fatigue resistance of the laminated structure. The interlocking connection between the energy-absorbing structure and the docking structure makes the installation of the energy-absorbing structure more convenient.

Description

Technical Field

[0001] This invention relates to the field of rubber bearing technology, specifically a modified high-damping composite rubber bearing. Background Technology

[0002] Bridge and building bearings are generally made of natural rubber, while high-damping bearings typically use lead-core rubber bearings, which involve adding one or more lead cores inside a natural rubber bearing. Patent application number 202010680658.7 discloses a modified high-damping composite rubber bearing that solves the technical problems of "although lead-core rubber bearings have high damping and good protective effects, lead is a heavy metal, causing environmental pollution during use and posing health risks to workers during production, thus failing to meet green environmental protection requirements; furthermore, its self-recovery ability is weak, and its vibration isolation frequency band is narrow; while bearings made of natural rubber are prone to large deformation when subjected to excessive external impact, leading to excessive deformation and damage."

[0003] However, by fixing the upper and lower connecting plates to the outer shell and then to the bridge with bolts to form a whole, the rubber bearing is large in volume and heavy in weight, making it inconvenient to quickly install and disassemble the upper and lower connecting plates. It is also not conducive to the quick disassembly and replacement of the rubber pad after damage. In addition, the assembly of the pads through rubber elastic columns, laminated plates, upper limit columns, lower limit columns, rubber elastic column mounting grooves, and springs is relatively complicated in structure. There are no reinforcing components inside the rubber pad, and when the deformation is too large, the rubber pad is prone to fatigue damage. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a modified high-damping composite rubber bearing.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a modified high-damping composite rubber bearing, including a fixing structure, the fixing structure including a base plate, the upper and lower base plates being fixed to the bridge by bolts; the base plate is provided with a first positioning groove of a semi-cylindrical structure;

[0006] A docking structure is provided on the base plate. The docking structure includes a docking block and a protrusion. The docking block is engaged with the base plate, and a protrusion is fixed on the docking block. The protrusion engages with a first positioning groove.

[0007] A limiting structure is provided on the base plate for limiting the protrusion;

[0008] An energy-absorbing structure is fixed between the two docking blocks;

[0009] A stacked structure is provided between the two docking blocks;

[0010] The positioning structure on the docking block positions the stacked structure.

[0011] Specifically, the energy-absorbing structure includes an end cap and a shell, the shell and the end cap respectively engage with two docking blocks, a solid shaft is fixed on the shell, and the end cap is fixedly connected to the solid shaft.

[0012] Specifically, an energy-absorbing composite material is filled between the outer shell and the solid shaft, and a sealing ring abuts between the outer shell and the end cap.

[0013] Specifically, the laminated structure includes rubber layers, and multiple rubber layers are sleeved on the outer shell, with the multiple rubber layers disposed between two mating blocks.

[0014] Specifically, the rubber layer is wrapped with an inner ring and reinforcing ribs, and the inner ring and reinforcing ribs are fixedly connected.

[0015] Specifically, the positioning structure includes a slide rod; the slide rod passes through the rubber layer, and the two ends of the slide rod are slidably connected to the grooves on the mating block. The mating block is provided with a countersunk hole, and the slide rod is threadedly connected to a bolt, with the bolt passing through the countersunk hole.

[0016] Specifically, the limiting structure includes a limiting ring, which is rotatably provided on the base plate. A stop block on the base plate limits the limiting ring. The limiting ring has a second positioning groove. A push block is fixed on the limiting ring. A slider is fixed at the bottom end of the limiting ring. The slider is slidably connected to a guide groove on the base plate. A spring is fixed between the slider and the base plate. The slider has a mounting hole.

[0017] Specifically, when installing the protrusion, the push block needs to be manually pushed so that the first positioning groove aligns with the second positioning groove. The limiting ring drives the slider to pull the spring to extend. After the protrusion engages with the first positioning groove, the push block is released, the spring retracts, and the slider is reset, so that the limiting ring blocks the protrusion.

[0018] Specifically, a driving block is slidably provided on the base plate, and an anti-detachment block is provided on the driving block. The first inclined surface of the driving block abuts against the slider, and the second inclined surface of the driving block contacts the protrusion. In the initial state, the first positioning groove corresponds to the second positioning groove. When the protrusion contacts the second inclined surface, it drives the driving block to slide, and the driving block drives the limiting ring to automatically block the protrusion.

[0019] The beneficial effects of this invention are:

[0020] (1) The modified high-damping composite rubber bearing of the present invention uses a limiting structure to limit the fixed structure and the docking structure, which facilitates the installation of the fixed structure on the bridge and the assembly of the docking structure and the fixed structure. This makes the disassembly of the docking structure more convenient and the inspection and maintenance of the laminated structure more convenient, thus improving the efficiency of inspection and maintenance. That is, the two base plates are fixed to the bridge and the pier respectively by bolts. Then, the bridge deck is slightly raised using hoisting equipment or hydraulic cylinders so that the docking block can be placed on the base plate. When using the limiting structure in Embodiment 1, the push block needs to be manually pushed so that the first positioning groove corresponds to the second positioning groove. The limiting ring drives the slider to pull the spring to extend. When the protrusion engages with the first positioning groove, the push block is released, the spring retracts, and the slider is reset, so that the limiting ring blocks the protrusion, thus making the docking block and the base plate not... When the bridge is subjected to stress, the rubber layer, inner ring, outer shell, solid shaft, and energy-absorbing composite material absorb energy through deformation. After the rubber layer deforms, the distance between the two mating blocks changes, causing the bolt to slide in the countersunk hole and the slide bar to slide in the groove. This does not affect the operation of other components. The bolt passes through the mounting hole, and then the slider is fixed to the limiting ring. When using the limiting structure in Embodiment 2, in the initial state, the first positioning groove corresponds to the second positioning groove. When the protrusion contacts the second inclined surface, it drives the driving block to slide. The driving block drives the limiting ring to automatically block the protrusion. When disassembling, first remove the bolt in the limiting ring and the slider, and then push the push block so that the push block pushes the limiting ring to not block the protrusion. When the mating block is removed, the spring extends and drives the slider to reset, so that the mounting hole on the slider corresponds to the bolt. Then install the bolt to fix the limiting ring to the slider.

[0021] (2) The modified high-damping composite rubber bearing of the present invention has a stacked structure positioned by a positioning structure, which makes the assembly of the stacked structure more convenient and quick. At the same time, the design of the stacked structure makes the fatigue resistance of the stacked structure better. That is, a sliding rod is fixed to a bottom connecting block by bolts so that the sliding rod is inside the sliding groove. Then, multiple rubber layers are sleeved on the sliding rod and the outer shell. After the rubber layers are installed, the other connecting block at the top is connected by bolts so that the two connecting blocks apply a resisting force to the rubber layers. The rubber layers have a hollow inner ring inside. The setting of the inner ring facilitates the reset of the rubber layers and makes the fatigue resistance of the rubber layers better. Reinforcing ribs are fixed between the inner rings to make the overall stability better.

[0022] (3) The modified high-damping composite rubber bearing of the present invention has an interlocking connection between the energy-absorbing structure and the docking structure, which makes the installation of the energy-absorbing structure more convenient; that is: open the end cover, and then fill the space between the outer shell and the solid shaft with energy-absorbing composite material, which is composed of porous nanomaterial and matrix liquid; then fix the end cover to the outer shell and the solid shaft, and a sealing ring is provided between the end cover and the outer shell to improve the sealing performance. The end cover is designed to facilitate the replacement of the internal energy-absorbing composite material. At the same time, the end cover and the outer shell are respectively interlocked with two docking blocks, making the assembly of the outer shell and the docking blocks more convenient. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 A schematic diagram of the overall structure of the first and second embodiments of a modified high-damping composite rubber bearing provided by the present invention;

[0025] Figure 2 for Figure 1 The diagram shown is an enlarged view of the structure of part A.

[0026] Figure 3 This is a cross-sectional view of the energy-absorbing structure of the present invention;

[0027] Figure 4 for Figure 3 The diagram shown is an enlarged view of the structure of section B.

[0028] Figure 5 for Figure 4 The diagram shows an enlarged view of section C.

[0029] Figure 6 A schematic diagram of the limiting structure of a first embodiment of a modified high-damping composite rubber bearing provided by the present invention;

[0030] Figure 7 for Figure 6 The diagram shows the connection structure between the limiting ring and the slider.

[0031] Figure 8 A schematic diagram of the limiting structure of a second embodiment of a modified high-damping composite rubber bearing provided by the present invention;

[0032] Figure 9 for Figure 8 The diagram shows the exploded structure of the limiting structure.

[0033] In the diagram: 1. Fixed structure; 101. Base plate; 102. First positioning groove; 2. Docking structure; 201. Docking block; 202. Protrusion; 3. Positioning structure; 301. Bolt; 302. Sliding rod; 303. Countersunk hole; 304. Sliding groove; 4. Layered structure; 401. Rubber layer; 402. Inner ring; 403. Reinforcing rib; 5. Limiting structure; 501. Stop block; 502. Limiting ring; 503. Second positioning groove; 504. Sliding block; 505. Guide groove; 506. Spring; 507. Mounting hole; 508. Drive block; 509. First inclined surface; 510. Second inclined surface; 511. Anti-detachment block; 512. Push block; 6. Energy-absorbing structure; 601. End cap; 602. Outer shell; 603. Solid shaft; 604. Energy-absorbing composite material; 605. Sealing ring. Detailed Implementation

[0034] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0035] Example 1

[0036] like Figures 1-7 As shown, the modified high-damping composite rubber bearing proposed in Embodiment 1 of the present invention includes a fixing structure 1, the fixing structure 1 including a base plate 101, the upper and lower base plates 101 being fixed to the bridge by bolts; the base plate 101 is provided with a first positioning groove 102 of a semi-cylindrical structure.

[0037] The docking structure 2 is connected to the base plate 101. The docking structure 2 includes a docking block 201 and a protrusion 202. The docking block 201 is engaged with the base plate 101, and the protrusion 202 is fixed on the docking block 201. The protrusion 202 is engaged with the first positioning groove 102.

[0038] Limiting structure 5, the base plate 101 is provided with limiting structure 5 for limiting protrusion 202; energy absorption structure 6, the energy absorption structure 6 is fixed between the two docking blocks 201; stacked structure 4, the stacked structure 4 is provided between the two docking blocks 201; positioning structure 3, the positioning structure 3 on the docking block 201 positions the stacked structure 4.

[0039] The energy-absorbing structure 6 includes an end cap 601 and a shell 602. The shell 602 and the end cap 601 are respectively engaged with two docking blocks 201. A solid shaft 603 is fixed on the shell 602. The end cap 601 is fixedly connected to the solid shaft 603. An energy-absorbing composite material 604 is filled between the shell 602 and the solid shaft 603. A sealing ring 605 abuts between the shell 602 and the end cap 601.

[0040] First, open the end cap 601, then fill the space between the outer shell 602 and the solid shaft 603 with energy-absorbing composite material 604. The energy-absorbing composite material 604 is composed of porous nanomaterials and matrix liquid. The matrix liquid is gelatin, and the porous nanomaterial is graphite. The mass ratio of graphite to gelatin is 1:(2~4). Both the outer shell 602 and the solid shaft 603 are shape memory alloys. Then, fix the end cap 601 to the outer shell 602 and the solid shaft 603. A sealing ring 605 is provided between the end cap 601 and the outer shell 602 to improve the sealing performance. The end cap 601 facilitates the replacement of the internal energy-absorbing composite material 604. At the same time, the end cap 601 and the outer shell 602 are respectively engaged with two docking blocks 201, making the assembly of the outer shell 602 and the docking blocks 201 more convenient.

[0041] Specifically, the laminated structure 4 includes a rubber layer 401, and multiple rubber layers 401 are sleeved on the outer shell 602. The multiple rubber layers 401 are disposed between two mating blocks 201. The rubber layer 401 is wrapped with an inner ring 402 and a reinforcing rib 403. The inner ring 402 and the reinforcing rib 403 are fixedly connected.

[0042] The positioning structure 3 includes a slide rod 302; the slide rod 302 passes through the rubber layer 401, and the two ends of the slide rod 302 are slidably connected to the slide groove 304 on the docking block 201. The docking block 201 is provided with a countersunk hole 303, and the slide rod 302 is threadedly connected to a bolt 301, with the bolt 301 passing through the countersunk hole 303.

[0043] A sliding rod 302 is fixed to a bottom connecting block 201 with bolts 301, so that the sliding rod 302 is inside the sliding groove 304. Then, multiple rubber layers 401 are fitted onto the sliding rod 302 and the outer shell 602. After the rubber layers 401 are installed, another connecting block 201 at the top is connected with bolts 301, so that the two connecting blocks 201 apply a resisting force to the rubber layers 401. The rubber layers 401 have a hollow inner ring 402 inside. The setting of the inner ring 402 facilitates the reset of the rubber layers 401, making the rubber layers 401 more fatigue-resistant. Reinforcing ribs 403 are fixed between the inner rings 402 to improve the overall stability.

[0044] Specifically, the limiting structure 5 includes a limiting ring 502, which is rotatably mounted on the base plate 101. A stop block 501 on the base plate 101 limits the limiting ring 502. The limiting ring 502 is provided with a second positioning groove 503. A push block 512 is fixed on the limiting ring 502. A slider 504 is fixed at the bottom end of the limiting ring 502. The slider 504 is slidably connected to a guide groove 505 on the base plate 101. A spring 506 is fixed between the slider 504 and the base plate 101. The slider 504 is provided with a mounting hole 507.

[0045] The two base plates 101 are respectively fixed to the bridge and pier with bolts. Then, using hoisting equipment or hydraulic cylinders, the bridge deck is slightly raised so that the connecting block 201 can be placed on the base plate 101. When using the limiting structure 5 in Embodiment 1, the push block 512 needs to be manually pushed so that the first positioning groove 102 corresponds to the second positioning groove 503. The limiting ring 502 drives the slider 504 to pull the spring 506 to extend. When the protrusion 202 engages with the first positioning groove 102, the push block 512 is released, the spring 506 retracts, and the slider 504 returns to its original position, so that the limiting ring... 502 blocks the protrusion 202, thus preventing the mating block 201 from detaching from the base plate 101. When the bridge is under stress, the rubber layer 401, inner ring 402, outer shell 602, solid shaft 603, and energy-absorbing composite material 604 absorb energy through deformation. After the rubber layer 401 deforms, the distance between the two mating blocks 201 will change, causing the bolt 301 to slide in the countersunk hole 303 and the slide rod 302 to slide in the groove 304. This will not affect the operation of other components. The bolt passes through the mounting hole 507, and then the slider 504 is fixed between the limiting ring 502.

[0046] Example 2

[0047] like Figures 1-5 and Figures 8-9 As shown, the modified high-damping composite rubber support proposed in this embodiment differs from the first embodiment above in that a driving block 508 is slidably provided on the base plate 101, and an anti-detachment block 511 is provided on the driving block 508. The first inclined surface 509 of the driving block 508 abuts against the slider 504, and the second inclined surface 510 of the driving block 508 contacts the protrusion 202. In the initial state, the first positioning groove 102 corresponds to the second positioning groove 503. When the protrusion 202 contacts the second inclined surface 510, it drives the driving block 508 to slide. The driving block 508 drives the limiting ring 502 to automatically block the protrusion 202.

[0048] When using the limiting structure 5 in Embodiment 2, in the initial state, the first positioning groove 102 corresponds to the second positioning groove 503. When the protrusion 202 contacts the second inclined surface 510, it drives the driving block 508 to slide. The driving block 508 drives the limiting ring 502 to automatically block the protrusion 202. When disassembling, first remove the bolts in the limiting ring 502 and the slider 504, and then push the push block 512 so that the push block 512 pushes the limiting ring 502 to not block the protrusion 202. When the docking block 201 is removed, the spring 506 extends and drives the slider 504 to reset, so that the mounting hole 507 on the slider 504 corresponds to the bolt. Then install the bolt to fix the limiting ring 502 and the slider 504.

[0049] In use, the end cap 601 is first opened, and then an energy-absorbing composite material 604 is filled between the outer shell 602 and the solid shaft 603. The energy-absorbing composite material 604 is composed of porous nanomaterials and matrix liquid. The matrix liquid is gelatin, and the porous nanomaterial is graphite. The mass ratio of graphite to gelatin is 1:(2-4). Both the outer shell 602 and the solid shaft 603 are shape memory alloys. Then, the end cap 601 is fixed to the outer shell 602 and the solid shaft 603. A sealing ring 605 is provided between the end cap 601 and the outer shell 602 to improve the sealing performance. The end cap 601 facilitates the replacement of the internal energy-absorbing composite material 604. At the same time, the end cap 601 and the outer shell 602 are respectively engaged with two docking blocks 201, making the assembly of the outer shell 602 and the docking blocks 201 more convenient.

[0050] A sliding rod 302 is fixed to a bottom connecting block 201 with bolts 301, so that the sliding rod 302 is inside the sliding groove 304. Then, multiple rubber layers 401 are fitted onto the sliding rod 302 and the outer shell 602. After the rubber layers 401 are installed, another connecting block 201 at the top is connected with bolts 301, so that the two connecting blocks 201 apply a resisting force to the rubber layers 401. The rubber layers 401 have a hollow inner ring 402 inside. The setting of the inner ring 402 facilitates the reset of the rubber layers 401, making the fatigue resistance of the rubber layers 401 better. Reinforcing ribs 403 are fixed between the inner rings 402 to improve the overall stability.

[0051] The two base plates 101 are respectively fixed to the bridge and pier with bolts. Then, using hoisting equipment or hydraulic cylinders, the bridge deck is slightly raised so that the connecting block 201 can be placed on the base plate 101. When using the limiting structure 5 in Embodiment 1, the push block 512 needs to be manually pushed so that the first positioning groove 102 corresponds to the second positioning groove 503. The limiting ring 502 drives the slider 504 to pull the spring 506 to extend. When the protrusion 202 engages with the first positioning groove 102, the push block 512 is released, the spring 506 retracts, and the slider 504 returns to its original position, so that the limiting ring... 502 blocks the protrusion 202, thus preventing the mating block 201 from separating from the base plate 101. When the bridge is under stress, the rubber layer 401, inner ring 402, outer shell 602, solid shaft 603 and energy-absorbing composite material 604 absorb energy through deformation. After the rubber layer 401 deforms, the distance between the two mating blocks 201 will change, causing the bolt 301 to slide in the countersunk hole 303 and the slide rod 302 to slide in the groove 304. This will not affect the operation of other components. The bolt passes through the mounting hole 507, and then the slider 504 is fixed between the limiting ring 502.

[0052] When using the limiting structure 5 in Embodiment 2, in the initial state, the first positioning groove 102 corresponds to the second positioning groove 503. When the protrusion 202 contacts the second inclined surface 510, it drives the driving block 508 to slide. The driving block 508 drives the limiting ring 502 to automatically block the protrusion 202. When disassembling, first remove the bolts in the limiting ring 502 and the slider 504, and then push the push block 512 so that the push block 512 pushes the limiting ring 502 to not block the protrusion 202. When the docking block 201 is removed, the spring 506 extends and drives the slider 504 to reset, so that the mounting hole 507 on the slider 504 corresponds to the bolt. Then install the bolt to fix the limiting ring 502 and the slider 504. The limiting structure 5 in Embodiment 2 is more stable and flexible in operation, but the structure is more complex than that in Embodiment 1.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A modified high-damping composite rubber bearing, characterized in that, include: The fixed structure (1) includes a base plate (101), and the upper and lower base plates (101) are fixed to the bridge by bolts; the base plate (101) is provided with a first positioning groove (102) of a semi-cylindrical structure. The docking structure (2) is connected to the base plate (101). The docking structure (2) includes a docking block (201) and a protrusion (202). The docking block (201) is engaged on the base plate (101). The protrusion (202) is fixed on the docking block (201). The protrusion (202) is engaged with the first positioning groove (102). A limiting structure (5) is provided on the base plate (101) for limiting the protrusion (202); the limiting structure (5) includes a limiting ring (502), the limiting ring (502) is rotatably provided on the base plate (101), the stop block (501) on the base plate (101) limits the limiting ring (502), and the limiting ring (502) is provided with a second positioning groove (503). A push block (512) is fixed on the limiting ring (502), and a slider (504) is fixed at the bottom end of the limiting ring (502). The slider (504) is slidably connected to the guide groove (505) on the base plate (101). A spring (506) is fixed between the slider (504) and the base plate (101). The slider (504) is provided with a mounting hole (507). A drive block (508) is slidably provided on the base plate (101). The drive block (508) is provided with an anti-detachment mechanism. Block (511), the first inclined surface (509) of the driving block (508) abuts against the slider (504), and the second inclined surface (510) of the driving block (508) contacts the protrusion (202). In the initial state, the first positioning groove (102) corresponds to the second positioning groove (503). When the protrusion (202) contacts the second inclined surface (510), it drives the driving block (508) to slide. The driving block (508) drives the limiting ring (502) to automatically block the protrusion (202). Energy-absorbing structure (6), with the two docking blocks (201) fixed together. A stacked structure (4) is provided between the two docking blocks (201). Positioning structure (3) on the docking block (201) positions the stacked structure (4).

2. The modified high-damping composite rubber bearing according to claim 1, characterized in that: The energy-absorbing structure (6) includes an end cap (601) and a shell (602). The shell (602) and the end cap (601) are respectively engaged with two docking blocks (201). A solid shaft (603) is fixed on the shell (602). The end cap (601) is fixedly connected to the solid shaft (603).

3. The modified high-damping composite rubber bearing according to claim 2, characterized in that: An energy-absorbing composite material (604) is filled between the outer shell (602) and the solid shaft (603), and a sealing ring (605) abuts between the outer shell (602) and the end cap (601).

4. The modified high-damping composite rubber bearing according to claim 2, characterized in that: The stacked structure (4) includes a rubber layer (401), and a plurality of rubber layers (401) are sleeved on the outer shell (602), with the plurality of rubber layers (401) disposed between two mating blocks (201).

5. A modified high-damping composite rubber bearing according to claim 4, characterized in that: The rubber layer (401) is wrapped with an inner ring (402) and a reinforcing rib (403), and the inner ring (402) and the reinforcing rib (403) are fixedly connected.

6. A modified high-damping composite rubber bearing according to claim 4, characterized in that: The positioning structure (3) includes a slide rod (302); the slide rod (302) passes through the rubber layer (401), and the two ends of the slide rod (302) are slidably connected to the grooves (304) on the docking block (201). The docking block (201) is provided with countersunk holes (303), and the slide rod (302) is threadedly connected to a bolt (301). The bolt (301) passes through the countersunk hole (303).

7. A modified high-damping composite rubber bearing according to claim 1, characterized in that: When installing the protrusion (202), the push block (512) needs to be pushed manually so that the first positioning groove (102) corresponds to the second positioning groove (503). The limiting ring (502) drives the slider (504) to pull the spring (506) to extend. After the protrusion (202) is engaged with the first positioning groove (102), the push block (512) is released, the spring (506) contracts, and the slider (504) is reset, so that the limiting ring (502) blocks the protrusion (202).

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