Pre-tightening elastic module and elastic cushion

Abstract

The invention discloses a pre-tightening elastic module which comprises a first spring, a first end cover, a second end cover and a first flexible connecting piece. The first end cover and the second end cover are oppositely arranged, and the first spring is fixed between the first end cover and the second end cover; the first spring is in a pre-tightening state in an initial state; two ends of the first flexible connecting piece are respectively connected with the first end cover and the second end cover; when the first spring is in an initial state, the first flexible connecting piece limits the first end cover and the second end cover from moving away from each other. In the other construction mode, the pre-tightening elastic module further comprises a waist ring and a second spring, the first spring is fixed between the first end cover and the waist ring, and the second spring is fixed between the second end cover and the waist ring. And the first spring and the second spring are in a pre-tightening state in an initial state. The invention further discloses an elastic cushion. A main body of the elastic cushion is formed by splicing the pre-tightening elastic modules in the longitudinal direction or the transverse direction in a detachable connection mode. The elastic cushion further comprises a soft cushion and a flexible cloth cover.

Description

Technical Field

[0001] This invention relates to the field of furniture, and more particularly to a pre-tightened elastic module and an elastic pad. Background Technology

[0002] Beds and sofas are essential furniture in people's daily lives. Elastic mattresses, with their softness, comfort, breathability, and long lifespan, have become a crucial component of most beds and sofas. However, traditional elastic mattresses are not pre-tightened at the factory, leading to several issues that affect the user experience. For example, the significant deformation of the mattress when lying down results in excessive softness, which is not ideal for the elderly, children, or those with fragile bones or blood circulation, offering insufficient comfort and health safety. Secondly, elastic mattresses are prone to permanent deformation due to elastic fatigue over long-term use, which is unavoidable. Traditional elastic mattresses without pre-tightening exhibit greater permanent deformation after elastic fatigue, exacerbating uneven collapse between frequently stressed areas and other areas, thus shortening the mattress's lifespan. Therefore, there is an urgent need to invent a pre-tightened elastic mattress to solve these problems, thereby improving the comfort and lifespan of elastic mattresses. Summary of the Invention

[0003] The main objective of this invention is to provide a pre-tightened elastic pad that solves the problem of excessive deformation of traditional elastic pads under pressure and significant uneven collapse after long-term use.

[0004] To solve the above-mentioned technical problems, the present invention provides a pre-tightened elastic module, including a first spring, a first end cap, a second end cap, and a first flexible connector;

[0005] The first end cap and the second end cap are disposed facing each other, and the first spring is fixed between the first end cap and the second end cap;

[0006] When the first spring is in its initial state, its length is less than its length in its free state;

[0007] One end of the first flexible connector is connected to the first end cap, and the other end is connected to the second end cap; when the first spring is in the initial state, the first flexible connector restricts the first end cap and the second end cap from moving apart.

[0008] In a preferred embodiment, the first end cap is provided with a first fixing part to fix one end of the first spring; the second end cap is provided with a second fixing part to fix the other end of the first spring.

[0009] When the first spring is in the initial state, the vertical distance between the first fixing part and the second fixing part is less than the free length of the first spring.

[0010] In a preferred embodiment, the first end cap is provided with a first clearance hole, and the first flexible connector passes through the first clearance hole and can move relative to the first end cap in the axial direction; correspondingly, the end of the first flexible connector is also provided with a first end cap, and in the initial state, the first end cap and the first end cap are limited to fit together in the direction of the first spring restoring force.

[0011] In a preferred embodiment, a first limiting member is provided on the surface of the first flexible connector. When the first spring is further compressed, the first limiting member and the first end cap engage in a limiting cooperation along the extension and retraction direction of the first spring.

[0012] In a preferred embodiment, the first limiting member is a set of double-layered retaining rings disposed in the diameter direction of the first flexible connector;

[0013] The distance between the two layers of retaining rings is not less than the thickness of the first end cap, so that they can be respectively engaged on both sides of the first end cap under the action of external force, and perform a limiting cooperation with the first end cap along the extension and retraction direction of the first spring.

[0014] In a preferred embodiment, the first spring has a tapered structure.

[0015] The present invention provides an elastic pad, including the pre-tightened elastic module described above.

[0016] In a preferred embodiment, two or more layers of the pre-tightening elastic modules are provided, and the upper and lower pre-tightening elastic modules are detachably positioned together.

[0017] In a preferred embodiment, the pre-tightening elastic module located on the upper layer is recessed at the bottom to define a locking female part, the width of which gradually decreases or remains constant along the concave direction;

[0018] The lower layer of the pre-tightening elastic module has a protruding locking male component at the top; the locking male component can be nested in the upper layer of the locking female component and is limited to fit with the locking female component in the width direction.

[0019] The present invention also provides a pre-tightened elastic module, including a first spring, a second spring, a first end cap, a second end cap, a waist ring, and a first flexible connector;

[0020] The first end cap and the second end cap are arranged facing each other and are respectively located on both sides of the plane where the waist ring is located; the first spring is fixed between the first end cap and the waist ring, and the second spring is fixed between the second end cap and the waist ring;

[0021] When the first spring and the second spring are in their initial state, their lengths are less than their lengths in their free state.

[0022] When the first spring and the second spring are in the initial state, the first flexible connector restricts the first end cap and the second end cap from moving away from the waist ring.

[0023] In a preferred embodiment, the first end cap is provided with a first fixing part to fix one end of the first spring; the second end cap is provided with a second fixing part to fix one end of the second spring; the waist ring is provided with a third fixing part and a fourth fixing part to fix the other ends of the first spring and the second spring, respectively.

[0024] When the first spring is in the initial state, the vertical distance between the first fixing part and the third fixing part is less than the free length of the first spring; when the second spring is in the initial state, the vertical distance between the second fixing part and the fourth fixing part is less than the free length of the second spring.

[0025] In a preferred embodiment, the first flexible connector is a single-segment structure; the first flexible connector passes through the waist ring, with one end connected to the first end cap and the other end connected to the second end cap.

[0026] In a preferred embodiment, the first flexible connector has a two-section structure, including a first sub-connector and a second sub-connector; one end of the first sub-connector is connected to the first end cap, and the other end is connected to the waist ring; one end of the second sub-connector is connected to the second end cap, and the other end is connected to the waist ring.

[0027] In a preferred embodiment, at least one of the first spring and the second spring has a tapered structure.

[0028] The present invention also provides an elastic pad, including the pre-tightened elastic module described above.

[0029] In a preferred embodiment, the elastic pad provided by the present invention further includes lateral connectors, and the pre-tightening elastic modules are connected in pairs laterally through the lateral connectors.

[0030] In a preferred embodiment, the elastic pad provided by the present invention further includes a soft pad; the soft pad is disposed on the upper surface of the uppermost pre-tightening elastic module.

[0031] In a preferred embodiment, the elastic pad provided by the present invention further includes a flexible fabric sleeve; the flexible fabric sleeve wraps around the pre-tightened elastic module from all sides.

[0032] In a preferred embodiment, the flexible fabric cover and the cushion are detachably connected.

[0033] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0034] The elastic pad provided by this invention uses a pre-tightened elastic module as the supporting body, so that the elastic pad has suitable stiffness when it leaves the factory. Due to its small deformation under pressure, it has high comfort and is suitable for a wider range of people. It can reduce the permanent deformation caused by elastic fatigue of the first spring, and significantly improve the phenomenon of uneven collapse of the elastic pad after long-term use, thereby extending its service life. While maintaining the same support performance as traditional elastic pads, the structure is more compact in the longitudinal direction, saving longitudinal space of the bed.

[0035] The pre-tightened elastic module provided by the present invention uses the first flexible connector to pull and fix the pre-compressed first spring at the center, which has a simple structure and stable force; and the first spring adopts a conical structure, which makes the pre-tightened elastic module have better bending resistance and lateral stability.

[0036] The pre-tightened elastic module provided by the present invention can be compressed to a preset length and locked before assembly, thereby saving more storage space during transportation and storage;

[0037] The pre-tightening elastic module provided by this invention can be detachably assembled in both the horizontal and vertical directions. For manufacturers, this not only simplifies the production process and provides ample space for product line extension, but also allows users to assemble it freely and flexibly according to furniture of different sizes, such as sofas and floor mats, thus making it applicable to a wider range of home scenarios. Attached Figure Description

[0038] Figure 1 This is a cross-sectional schematic diagram of the connection between the upper and lower layers of the pre-tightening elastic module described in Embodiment 1 of the present invention;

[0039] Figure 2 This is a partial cross-sectional schematic diagram of the elastic pad described in Embodiment 1 of the present invention;

[0040] Figure 3 This is a partial cross-sectional schematic diagram of the elastic pad described in Embodiment 2 of the present invention;

[0041] Figure 4 This is a planar schematic diagram of the lateral connector described in Embodiments 1 and 2 of the present invention;

[0042] Figure 5 This is a frontal view of the pre-tightening elastic module described in Embodiment 3 of the present invention;

[0043] Figure 6 This is a schematic elevation view of the assembled pre-tightening elastic module as described in Embodiment 3 of the present invention;

[0044] Figure 7 This is a three-dimensional schematic diagram of the assembled pre-tightening elastic module as described in Embodiment 3 of the present invention;

[0045] Figure 8 This is a three-dimensional schematic diagram of the elastic pad described in Embodiments 1 to 3 of the present invention.

[0046] The diagram is labeled as follows: 1-1-Pre-tightening elastic module, 2-First spring, 3-First end cap, 4-Second end cap, 5-First flexible connector, 6-First lateral connector, 1-2-Pre-tightening elastic module, 7-First end cap, 8-Second end cap, 9-Waist ring, 10-First spring, 11-Second spring, 12-Second lateral connector, 13-Soft pad, 14-Flexible cloth cover, 15-Independent bag; 31-First fixing part, 32-Card slotting male part, 33-Second clearance hole, 41-Second fixing part, 42-Card slotting female part, 43-First clearance hole, 51-First end cap, 52-Second end cap, 53-Clamping ring, 71-First fixing part, 81-Second fixing part, 91-Third fixing part, 92-Fourth fixing part, 121-First buckle, 122-Second buckle; 53-1 is the first clamping ring 5, 53-2 is the second clamping ring. Detailed Implementation

[0047] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0048] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0050] Example 1

[0051] like Figure 1 , Figure 2 , Figure 4 as well as Figure 8 As shown, this embodiment provides an elastic pad, including a pre-tightening elastic module 1-1, a first lateral connector 6, a soft pad 13, and a flexible fabric cover 14. The first lateral connector 6, serving as the lateral connector of the elastic pad, has a mesh structure to connect the pre-tightening elastic modules 1-1 side-by-side in pairs, forming a regular working array. The soft pad 13 is disposed on the upper surface of the pre-tightening elastic module 1-1, not only distributing the localized external force from above to achieve uniform force distribution on the pre-tightening elastic module 1-1, but also cushioning the sharp touch of the pre-tightening elastic module 1-1 to the user, thereby improving the user experience. The flexible fabric cover 14 is located below the outer periphery of the soft pad 13 and is detachably connected to the soft pad 13 using zippers, buttons, or other methods. The flexible fabric cover 14 has good breathability and, utilizing its own elasticity, tightly wraps the pre-tightening elastic module 1-1 from all sides, serving to provide waterproofing, dustproofing, and aesthetic appeal. Additionally, the elastic pad also includes an individual sleeve 15 that wraps around the outer periphery of each of the pre-tightened elastic modules 1-1 to provide protection.

[0052] like Figure 1 As shown, the pre-tensioned elastic module 1-1 provided in this embodiment includes a first spring 2, a first end cap 3, a second end cap 4, and a first flexible connector 5. The first end cap 3 and the second end cap 4 are arranged facing each other. The first end cap 3 is provided with a first fixing part 31, which fixes one end of the first spring 2; the second end cap 4 is provided with a second fixing part 41, which fixes the other end of the first spring 2. Therefore, the vertical distance between the first fixing part 31 and the second fixing part 41 defines the working length of the first spring 2. When the pre-tensioned elastic module 1-1 is in the initial state, the vertical distance between the first fixing part 31 and the second fixing part 41 is less than the free length of the first spring 2, so that the first spring 2 is in a pre-tensioned state.

[0053] In the initial state, to maintain a fixed distance between the first end cap 3 and the second end cap 4 and ensure that the first spring 2 is in a stable preloaded state, a first flexible connector 5 is provided between the first end cap 3 and the second end cap 4. One end of the first flexible connector 5 is connected to the first end cap 3, and the other end is connected to the second end cap 4. In the initial state, the first end cap 3 and the second end cap 4 tend to move apart under the restoring force of the first spring 2, causing the first flexible connector 5 to be in a tensioned state. Since the first flexible connector 5 has a large elastic modulus in the tensile direction, only a small deformation is needed to generate a large pulling effect on the first end cap 3 and the second end cap 4, helping the first end cap 3 and the second end cap 4 to counteract the supporting effect from the first spring 2, thereby maintaining a stable initial distance between them.

[0054] The deformation of the spring material has a non-linear relationship with the magnitude of the external force, which means that the more the spring is compressed, the greater its stiffness, and the smaller the amount of compression when subjected to the same axial pressure. Therefore, pre-tightening the pre-tightened elastic module 1-1 can bring many benefits: (1) it can make the elastic pad have appropriate stiffness when it leaves the factory, and the user can generate ideal elastic deformation when lying down, which is especially comfortable for people with weak bones and blood circulation systems; (2) it can reduce the elastic fatigue of the first spring 2, and at the same time reduce the permanent deformation caused by the elastic fatigue of the first spring 2, greatly improve the phenomenon of uneven collapse of the elastic pad after long-term use, and thus extend its service life; (3) compared with the un-pre-tightened elastic pad, the elastic pad is more compact in the longitudinal direction while maintaining the same support performance, saving the longitudinal space of the bed; etc.

[0055] The pre-tightening elastic module 1-1 provided in this embodiment can be locked after being compressed to a certain preset length, thereby saving more storage space during transportation and storage. Figure 1As shown, the first flexible connector 5 has a set of double-layered retaining rings 53 arranged radially outward near the first end cap 3, serving as the first limiting member. For ease of description, the retaining ring 53 near the second end cap 4 is referred to as the first retaining ring 53-1, and the other retaining ring 53 is referred to as the second retaining ring 53-2. Correspondingly, a first clearance hole 43 is provided on the second end cap 4. The first flexible connector 5 passes through the first clearance hole 43 and can move relative to the second end cap 4 axially. The first retaining ring 53-1 and the second retaining ring 53-2 are made of flexible material, and the distance between them is not less than the thickness of the second end cap 4, so that after the first spring 2 is compressed to a preset length under the action of external force, the first flexible connector 5 can be pulled by another external force to drive the first retaining ring 53-1 through the first clearance hole 43. Next, when the other external force is removed, the first retaining ring 53-1 and the second retaining ring 53-2 are respectively engaged on both sides of the second end cap 4, and are in a limiting engagement with the second end cap 4 along the extension and retraction direction of the first spring 2. When the pre-tightening elastic module 1-1 needs to be removed for assembly, the first end cap 3 and the second end cap 4 are simultaneously pushed outward axially, allowing the first retaining ring 53-1 to disengage from the second end cap 4, and the pre-tightening elastic module 1-1 returns to its initial state.

[0056] The flexibility of the first retaining ring 53-1 and the second retaining ring 53-2 should not be too small, otherwise the first retaining ring 53-1 will not be able to pass through the first relief hole 43 under the action of external force, or it will need to be subjected to a large external force to pass through the first relief hole 43; nor should it be too flexible, otherwise the first retaining ring 53-1 will easily disengage from the first relief hole 43 under the action of the restoring force of the first spring 2, and thus will not be able to perform a limiting engagement with the second end cap 4.

[0057] For ease of description, the side of the first end cap 3 and the second end cap 4 facing the first spring 2 is defined as the inner side, and the side facing away from the first spring 2 is defined as the outer side. Figure 1 As shown, the first flexible connector 5 is provided with a first end cap 51 at its end located outside the second end cap 4, to ensure that in the initial state, the first flexible connector 5 can be limited and engaged with the second end cap 4 in the direction of the restoring force of the first spring 2. Obviously, the diameters of the first end cap 51, the first retaining ring 53-1, and the second retaining ring 53-2 are all larger than the diameter of the first clearance hole 43.

[0058] like Figure 1As shown, in this embodiment, a second clearance hole 33 is provided in the middle of the first end cap 3, and the first flexible connector 5 can pass through the second clearance hole 33 and move relative to the first end cap along the axial direction. Similar to the arrangement of the first end cap 51, a second end cap 52 is provided at the end of the first flexible connector 5 located outside the first end cap 3, which is in a limiting engagement with the first end cap 3 in the initial state. In addition to the movable connection method adopted in this embodiment, in other embodiments, the first flexible connector 5 and the first end cap 3 can also be fixedly connected. Neither of these two connection methods affects the normal use of the pre-tightening elastic module 1-1.

[0059] As a simple alternative to the locking method described in this embodiment, during transportation and storage, after the first spring 2 is compressed to a preset length, the first flexible connector 5 can be tightened and knotted or clamped on the outside of the second end cap 4. As long as the lateral dimension of the knot or clamp is greater than the diameter of the first clearance hole 43, it can achieve a limiting engagement with the second end cap 4 along the direction of the restoring force of the first spring 2, preventing the first spring 2 from rebounding. Similarly, when the pre-tightened elastic module 1-1 needs to be removed for assembly, loosening the knot or removing the clamp will allow the pre-tightened elastic module 1-1 to return to its initial state.

[0060] In this embodiment, the first end cap 3 and the second end cap 4 function similarly and are interchangeable in structure and connection. This means that for those skilled in the art, there are multiple combinations of limiting engagement methods between the first flexible connector 5 and the first end cap 3 and the second end cap 4. For example, in other embodiments, the first retaining ring 53-1 and the second retaining ring 53-2 can be positioned near the second end cap 4. When the first spring 2 is compressed to a preset length, the first retaining ring 53-1 and the second retaining ring 53-2 engage with the first end cap 3 along the extension and retraction direction of the first spring 2. Correspondingly, in this embodiment, the first end cap 51 is positioned at the end of the first flexible connector 5 located outside the first end cap 3.

[0061] In this embodiment, the first spring 2 has a conical structure. For a conical spring, the diameters of the circles defined by any two adjacent length segments are different; that is, any two adjacent length segments have an inner and outer side. The outer length segment provides lateral support to the inner length segment. This means that when any length segment of the conical spring undergoes lateral deformation, it will be subjected to the reverse pulling force of the adjacent segment. This mechanism allows the first spring 2 to absorb some of the lateral force within its structure, thus giving the pre-tensioned elastic module 1-1 better bending resistance and lateral stability.

[0062] In this embodiment, the supporting body of the elastic pad is assembled from two layers of pre-tightened elastic modules 1-1 via a disassembly and reassembly connection. The connection method between the upper and lower layers of pre-tightened elastic modules 1-1 will now be described with reference to the figures. Figures 1-2 As shown, considering the arrangement space of the first end cap 51, the upper-layer pre-tightening elastic module 1-1 is recessed at the bottom, defining a locking female part 42. The width of the locking female part 42 gradually decreases or remains constant along the concave direction. The lower-layer pre-tightening elastic module 1-1 has a protruding locking male part 32 at the top. The longitudinal section of the locking male part 32 fits with the locking female part 42, and thus can be nested in the upper-layer locking female part 42, providing a limiting fit with the locking female part 42 in the width direction. This detachable connection method not only simplifies the production process and provides ample space for product line extension, but also allows users to freely and flexibly assemble furniture of different sizes, such as sofas and floor mats, making it suitable for a wider range of home scenarios.

[0063] Example 2

[0064] like Figure 3 As shown, the difference between the elastic pad provided in this embodiment and that in Embodiment 1 is that the supporting body of the elastic pad consists of only one layer of the pre-tightened elastic module 1-1.

[0065] The pre-tightening elastic module 1-1 used in this embodiment is the same pre-tightening elastic module 1-1 located on the upper layer in Embodiment 1. Since the pre-tightening elastic module 1-1 in this embodiment does not need to be spliced ​​between the upper and lower layers, in other embodiments, the locking female part 42 may not be provided at the bottom of the pre-tightening elastic module 1-1. Such non-substantial modifications are all within the protection scope of this invention.

[0066] As mentioned in Embodiment 1, the first end cap 3 and the second end cap 4 are interchangeable. This embodiment illustrates another connection relationship between the first flexible connector 5 and the first end cap 3 and the second end cap 4. Figure 3 As shown, the first end cap 51 is disposed on the outside of the first end cover 3, and the second end cap 52 is disposed on the outside of the second end cover 4; the retaining ring 53 is disposed near the second end cover 4 and engages with the first end cover 3 through the second clearance hole 33.

[0067] Apart from the differences mentioned above, the other parts of the pre-tightening elastic module and elastic pad provided in this embodiment are the same as those in Embodiment 1.

[0068] Example 3

[0069] like Figures 5-8As shown, the difference between the elastic pad provided in this embodiment and that in Embodiment 1 is that: (1) the pre-tightening elastic module 1-2 is a double-layer structure, and the first flexible connector 5 is not provided with the first limiting member; (2) based on (1), the supporting body of the elastic pad is composed of only one layer of the pre-tightening elastic module 1-2 connected laterally; (3) the lateral connector used is a snap-fit ​​structure. Now, with reference to the figure, the differences between (1) and (3) will be further explained.

[0070] like Figure 5 As shown, the pre-tensioned elastic module 1-2 provided in this embodiment includes a first spring 10, a second spring 11, a first end cap 7, a second end cap 8, a waist ring 9, and a first flexible connector 5. The first end cap 7 and the second end cap 8 are arranged facing each other and are located on opposite sides of the plane of the waist ring 9. The first end cap 7 is provided with a first fixing part 71, which fixes one end of the first spring 10; the second end cap 8 is provided with a second fixing part 81, which fixes one end of the second spring 11; the waist ring 9 is provided with a third fixing part 91 and a fourth fixing part 92, which fix the other ends of the first spring 10 and the second spring 11, respectively. In this way, the first spring 10 is fixed between the first end cap 7 and the waist ring 9, and the second spring 11 is fixed between the second end cap 8 and the waist ring 9. When the first spring 10 is in the initial state, the vertical distance between the first fixing part 71 and the third fixing part 91 is less than the free length of the first spring 10, so that the first spring 10 is in a pre-tensioned state. Similarly, when the second spring 11 is in the initial state, the vertical distance between the second fixing part 81 and the fourth fixing part 92 is less than the free length of the second spring 11, so that the second spring 11 is in a pre-tensioned state.

[0071] In this embodiment, in the initial state, the first flexible connector 5 is used to restrict the separation movement between the first end cap 7 and the waist ring 9, and between the second end cap 8 and the waist ring 9, thereby keeping the first spring 10 and the second spring 11 in a stable pre-tensioned state. In this embodiment, the first flexible connector 5 is a single-segment structure, passing through the waist ring 9, with one end connected to the first end cap 7 and the other end connected to the second end cap 8. In other embodiments, the first flexible connector 5 can be a two-segment structure. In this case, the first flexible connector 5 includes a first sub-connector and a second sub-connector. One end of the first sub-connector is connected to the first end cap 7 and the other end is connected to the waist ring 9, and one end of the second sub-connector is connected to the second end cap 8 and the other end is connected to the waist ring 9.

[0072] In this embodiment, the first flexible connector 5 is not provided with the first limiting member. Therefore, compared with the first embodiment, this embodiment does not further limit the connection method between the first flexible connector 5 and the first end cap 7 and the second end cap 8. That is, the end of the first flexible connector 5 can be fixedly connected to the first end cap 7 and the second end cap 8, or it can be configured to move relative to the second end cap 8 along the axial direction.

[0073] like Figures 5-6 As shown, in this embodiment, the lateral connector is a second lateral connector 12, which is a snap-fit ​​structure, including a second snap 121 and a second snap 122. The second snap 121 is disposed on the side edge of the first end cap 7 and the second end cap 8, and is disposed in sets every 90° along the outer periphery of the first end cap 7 or the second end cap 8. The second snap 122 is disposed on the side edge of the waist ring 9, and is aligned longitudinally with the second snap 121 assembly. When two adjacent sets of the pre-tightening elastic modules 1-2 abut laterally, the second snap 121 and the second snap 122 are engaged, and the pre-tightening elastic modules 1-2 can be assembled into a regular working array in the same plane.

[0074] Apart from the differences mentioned above, the other parts of the pre-tightening elastic module and elastic pad provided in this embodiment are the same as those in Embodiment 1.

[0075] The above description is merely a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention by those skilled in the art within the scope of the technology disclosed in the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A pre-tightening elastic module, characterized in that: Includes a first spring, a first end cap, a second end cap, and a first flexible connector; The first end cap and the second end cap are disposed facing each other, and the first spring is fixed between the first end cap and the second end cap; When the first spring is in its initial state, its length is less than its length in its free state; One end of the first flexible connector is connected to the first end cap, and the other end is connected to the second end cap; when the first spring is in the initial state, the first flexible connector restricts the first end cap and the second end cap from moving apart.

2. The pre-tightening elastic module according to claim 1, characterized in that: The first end cap is provided with a first fixing part to fix one end of the first spring; the second end cap is provided with a second fixing part to fix the other end of the first spring. When the first spring is in the initial state, the vertical distance between the first fixing part and the second fixing part is less than the free length of the first spring.

3. The pre-tightening elastic module according to claim 1, characterized in that: The first end cap is provided with a first clearance hole, and the first flexible connector passes through the first clearance hole and can move relative to the first end cap in the axial direction; correspondingly, the end of the first flexible connector is also provided with a first end cap, and in the initial state, the first end cap and the first end cap are limited to fit together in the direction of the first spring restoring force.

4. A pre-tightening elastic module according to claim 3, characterized in that: The first flexible connector has a first limiting member on its surface. When the first spring is further compressed, the first limiting member and the first end cap engage in a limiting cooperation along the extension and retraction direction of the first spring.

5. A pre-tightening elastic module according to claim 4, characterized in that: The first limiting member is a set of double-layer retaining rings, which are arranged in the diameter direction of the first flexible connector; The distance between the two layers of retaining rings is not less than the thickness of the first end cap, so that they can be respectively engaged on both sides of the first end cap under the action of external force, and perform a limiting cooperation with the first end cap along the extension and retraction direction of the first spring.

6. The pre-tightening elastic module according to any one of claims 1 to 5, characterized in that: The first spring has a conical structure.

7. A pre-tightening elastic module, characterized in that: It includes a first spring, a second spring, a first end cap, a second end cap, a waist ring, and a first flexible connector; The first end cap and the second end cap are arranged facing each other and are respectively located on both sides of the plane where the waist ring is located; the first spring is fixed between the first end cap and the waist ring, and the second spring is fixed between the second end cap and the waist ring; When the first spring and the second spring are in their initial state, their lengths are less than their lengths in their free state. When the first spring and the second spring are in the initial state, the first flexible connector restricts the first end cap and the second end cap from moving away from the waist ring.

8. A pre-tightening elastic module according to claim 7, characterized in that: The first end cap is provided with a first fixing part to fix one end of the first spring; the second end cap is provided with a second fixing part to fix one end of the second spring; the waist ring is provided with a third fixing part and a fourth fixing part to fix the other ends of the first spring and the second spring, respectively. When the first spring is in the initial state, the vertical distance between the first fixing part and the third fixing part is less than the free length of the first spring; when the second spring is in the initial state, the vertical distance between the second fixing part and the fourth fixing part is less than the free length of the second spring.

9. A pre-tightening elastic module according to claim 7, characterized in that: The first flexible connector is a single-segment structure; the first flexible connector passes through the waist ring, with one end connected to the first end cap and the other end connected to the second end cap.

10. A pre-tightening elastic module according to claim 7, characterized in that: The first flexible connector has a two-section structure, including a first sub-connector and a second sub-connector; one end of the first sub-connector is connected to the first end cap, and the other end is connected to the waist ring; one end of the second sub-connector is connected to the second end cap, and the other end is connected to the waist ring.

11. The pre-tightening elastic module according to any one of claims 7 to 10, characterized in that: At least one of the first spring and the second spring has a conical structure.

12. An elastic pad, characterized in that: Includes the pre-tightening elastic module as described in any one of claims 1 to 6.

13. The elastic pad according to claim 12, characterized in that: The system is equipped with two or more layers of pre-tightening elastic modules, and the upper and lower pre-tightening elastic modules are connected by a detachable positioning connection.

14. The elastic pad according to claim 13, characterized in that: The pre-tightening elastic module located on the upper layer is recessed at the bottom, defining a locking female part. The width of the locking female part gradually decreases or remains constant along the concave direction. The lower layer of the pre-tightening elastic module has a protruding locking male component at the top; the locking male component can be nested in the upper layer of the locking female component and is limited to fit with the locking female component in the width direction.

15. An elastic pad, characterized in that: Includes the pre-tightening elastic module as described in any one of claims 7 to 11.

16. The elastic pad according to any one of claims 12 to 15, characterized in that: It also includes lateral connectors, through which the pre-tightened elastic modules are connected in pairs laterally.

17. The elastic pad according to any one of claims 12 to 15, characterized in that: It also includes a soft pad; the soft pad is disposed on the upper surface of the uppermost pre-tightening elastic module.

18. An elastic pad according to claim 17, characterized in that: It also includes a flexible fabric sleeve; the flexible fabric sleeve wraps around the pre-tightened elastic module from all sides.

19. An elastic pad according to claim 18, characterized in that: The flexible fabric cover and the soft pad are detachably connected.

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