Bagged spring assembly and pillow

Abstract

The invention relates to a bagged spring assembly and a pillow. The bagged spring assembly comprises a spring body and a wrapping bag, the spring body is an unequal-pitch spring and comprises a first ring section and a second ring section, one end of the first ring section is connected with one end of the second ring section, the first ring section is located above the second ring section, the first ring section is provided with a first pitch, and the wrapping bag is located above the first ring section. The first ring section is provided with a first pitch, the second ring section is provided with a second pitch, the second pitch is larger than the first pitch, and the overall rigidity of the spring body generates step change when the first ring section is subjected to axial pressure to reach a ring closing state; and the wrapping bag wraps the spring body. According to the scheme provided by the invention, the supporting requirements under different sleeping postures can be met, and the sleeping experience of the user is improved.

Description

Technical Field

[0001] This application relates to the field of bedding technology, and more particularly to a pocket spring assembly and a pillow. Background Technology

[0002] Currently, the main pillow products on the market include latex pillows, memory foam pillows, and pocket spring pillows. Latex pillows typically use natural or synthetic latex as the filling material, giving them linear elastic properties; memory foam pillows typically use polyurethane foam, giving them linear viscoelastic properties. Both latex and memory foam pillows only have a single linear stiffness, making it impossible to simultaneously meet the conflicting needs of initial softness and support, and deep compression support.

[0003] In related technologies, pocket spring pillows generally use equal-pitch springs. The mechanical characteristics of equal-pitch springs are linear: from the first millimeter of compression to the last millimeter, the spring constant K remains constant. Equal-pitch springs can only provide linear support throughout the compression process and cannot automatically adjust their stiffness according to the depth of compression. When a user uses a pocket spring pillow with this technology while sleeping on their side, the user's head weight is concentrated in a small area. The equal-pitch spring is prone to fully coiling, resulting in a noticeable "bottoming out" sensation, severely impacting sleep quality and cervical spine support. Summary of the Invention

[0004] To address or partially address the problems existing in the related technologies, this application provides a pocket spring assembly and a pillow that can meet the support needs of different sleeping positions and improve the user's sleep experience.

[0005] The first aspect of this application provides a bagged spring assembly, which includes a spring body and a packaging bag. The spring body is an unequal pitch spring, and the spring body includes a first coil segment and a second coil segment. One end of the first coil segment is connected to one end of the second coil segment. The first coil segment is located above the second coil segment. The first coil segment has a first pitch, and the second coil segment has a second pitch, which is greater than the first pitch. The overall stiffness of the spring body undergoes a step change when the first coil segment is subjected to axial pressure and reaches a closed coil state. The packaging bag wraps the spring body.

[0006] Furthermore, the ratio of the second pitch to the first pitch is 1.5 to 3.

[0007] Furthermore, the effective number of coils of the spring body is 4 to 8; wherein, the effective number of coils of the first segment is 2 to 4, and / or, the effective number of coils of the second segment is 2 to 4.

[0008] Furthermore, the two opposite ends of the spring body are pressed against the package bag and are in a pre-compressed state. In the pre-compressed state, the compression of the spring body is 20-40% of the free height of the spring body.

[0009] Furthermore, the free height of the spring body is 70~100mm.

[0010] Furthermore, the spring body is a spring made of metal wire coiled together, and the tensile strength of the metal wire is greater than or equal to 1770 MPa.

[0011] Furthermore, the spring body is a spring made of metal wire coiled together, and the diameter of the metal wire is 0.6~1.2mm.

[0012] Furthermore, the outer diameter of the spring body is 30.5~57mm.

[0013] Furthermore, the ratio of the reaction force of the spring body when compressed by 30mm to the reaction force of the spring body when compressed by 20mm is 1.4 to 1.7.

[0014] This application also provides a pillow comprising at least a first layer, a second layer, and a third layer; The second layer is a spring layer formed by arranging multiple of the aforementioned bag spring assemblies. The second layer is sandwiched between the first layer and the third layer.

[0015] Furthermore, the first layer is the upper sponge layer, and the third layer is the lower sponge layer; the density of the first layer and / or the third layer is 35~80 kg / m³. 3 .

[0016] Furthermore, the thickness of the first layer is 30-40 mm, and the thickness of the third layer is 20-30 mm.

[0017] The technical solution provided in this application may include the following beneficial results: by setting a first coil segment and a second coil segment in the spring body, making the second pitch larger than the first pitch, when the pocket spring assembly is pressed down, the first coil segment preferentially closes into a rigid body, causing the stiffness of the spring body to increase in a stepwise manner, realizing a two-stage nonlinear mechanical characteristic from soft fit to deep hard support; compared with the traditional equal pitch spring, the spring body of this application has an ultimate support force that is about 30.9% higher, and can provide about 30mm of support and cushioning stroke under deep compression; using the pocket spring assembly in a pillow can effectively prevent the user from touching the bottom when sleeping on their side when the user presses the pillow deeply, thus expanding the user's body shape adaptation range.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0019] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0020] Figure 1 This is a schematic diagram of the structure of the bag spring assembly shown in the embodiments of this application; Figure 2 This is a cross-sectional view of the pillow shown in an embodiment of this application; Figure 3 This is a schematic diagram showing the compressed spring body according to an embodiment of this application; Figure 4 This is a schematic diagram of a traditional equal-pitch spring; Figure 5 This is a graph showing the change in support force after spring compression, as illustrated in an embodiment of this application.

[0021] Reference numerals in the attached diagram: Spring body 1; First coil segment 11; Second coil segment 12; First layer 2; Second layer 3; Third layer 4. Detailed Implementation

[0022] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0023] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application.

[0025] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In related technologies, pocket spring pillows generally use equal-pitch springs. The mechanical characteristics of equal-pitch springs are linear: from the first millimeter of compression to the last millimeter, the spring constant K remains constant. Equal-pitch springs can only provide linear support throughout the compression process and cannot automatically adjust their stiffness according to the depth of compression. When a user uses a pocket spring pillow of this technology while sleeping on their side, the user's head weight is concentrated in a small area, and the equal-pitch spring is prone to fully coiling, resulting in a noticeable "bottoming out" sensation, severely affecting the user's sleep quality and cervical spine support. To address the above problems, this application provides a pocket spring assembly and pillow that can meet the support needs of different sleeping positions and improve the user's sleep experience.

[0027] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0028] See Figure 1 The bagged spring assembly includes a spring body 1 and a packaging bag. The spring body 1 is an unequal pitch spring. The spring body 1 includes a first coil segment 11 and a second coil segment 12. One end of the first coil segment 11 is connected to one end of the second coil segment 12. The first coil segment 11 extends spirally from the second coil segment 12 in a direction away from the second coil segment 12, and the second coil segment 12 extends spirally from the first coil segment 11 in a direction away from the first coil segment 11.

[0029] The first coil segment 11 is located above the second coil segment 12. The first coil segment 11 has a first pitch, which is the distance between two adjacent coils in the first coil segment 11. The second coil segment 12 has a second pitch, which is the distance between two adjacent coils in the second coil segment 12. The second pitch is greater than the first pitch. When the spring body 1 is compressed, the first coil segment 11 closes its coil faster than the second coil segment 12. That is, the two adjacent coils of the first coil segment 11 come into contact with each other, and the first coil segment 11 is no longer compressed. The first coil segment 11 becomes a rigid body, and the overall stiffness of the spring body 1 undergoes a step change when the first coil segment 11 is subjected to axial pressure and reaches the closed state. After the first coil segment 11 closes its coil, if the spring body 1 is continued to be compressed, the second coil segment 12 contracts until the second coil segment 12 closes its coil. When the spring body 1 is in a free state, that is, when the spring body 1 is not compressed, the first pitch of any two adjacent coils in the first coil segment 11 is the same, and the second pitch of any two adjacent coils in the second coil segment 12 is the same. The spring body 1 is wrapped in a bag, with the two opposite ends of the spring body 1 abutting against the inner surface of the bag. The bag serves to protect the spring body 1 and limit its movement.

[0030] In some embodiments, the first ring segment 11 and the second ring segment 12 are made of the same material and are integrally formed. In some embodiments, the first ring segment 11 and the second ring segment 12 may be made of the same material or different materials and are fixed together by welding.

[0031] This application, by setting a first coil segment 11 and a second coil segment 12 in the spring body 1, makes the second pitch larger than the first pitch. When the pocket spring assembly is pressed down, the first coil segment 11 preferentially closes into a rigid body, causing the stiffness of the spring body 1 to increase in a stepwise manner, realizing a two-stage nonlinear mechanical characteristic from soft fit to deep hard support. Compared with traditional equal-pitch springs, the spring body 1 of this application has an ultimate support force that is about 30.9% higher, and can provide a support and buffer stroke of about 30mm under deep compression. Using the pocket spring assembly in a pillow can effectively prevent the user from hitting the bottom when sleeping on their side when the user presses the pillow deeply, thus expanding the user's body shape adaptation range.

[0032] The reaction force F of spring body 1 when compressed by 30mm 30 The reaction force F when compressed by 20mm 20The ratio is 1.4 to 1.7. When the spring body 1 is in a free state, that is, when the spring body 1 is not compressed, the ratio of the second pitch to the first pitch is 1.5 to 3, preferably 1.5 to 1.6. Setting the ratio of the second pitch to the first pitch within this range allows the spring body 1 to be better compatible with high, medium, and low pillows, ensuring that when the user sleeps on their back with a pillow with a pocket spring assembly, the first coil segment 11 is in a closed or nearly closed state; when the user sleeps on their side with a pillow with a pocket spring assembly, the first coil segment 11 is in a closed state, and the second coil segment 12 is in a partially contracted or nearly closed state, effectively preventing the user from touching the bottom while sleeping on their side.

[0033] The effective number of coils in the spring body 1 is 4 to 8. In some embodiments, the effective number of coils in the first segment 11 is 2 to 4. In some embodiments, the effective number of coils in the second segment 12 is 2 to 4. In some embodiments, the effective number of coils in the first segment 11 is the same as that in the second segment 12, with both segments having 2 to 4 effective coils. After the first segment 11 is closed, the overall stiffness of the spring becomes N / (N-n1) times that before closure, where N is the total effective number of coils in the spring body 1 and n1 is the effective number of coils in the first segment 11. When using pocket spring components in a pillow, the pillow height needs to be controlled within the comfortable range for human sleep. Because the pillow height is limited and the spring body 1 has a certain wire diameter, the number of coils in the first coil segment 11 and the second coil segment 12 cannot be too high. This application sets the effective number of coils in the spring body 1 to 4 to 8 to ensure that the spring body 1 does not occupy too much of the pillow's height, so that when the user sleeps on their side, the second coil segment 12 will not be fully closed, effectively preventing the user from touching the bottom while sleeping on their side.

[0034] The two opposite ends of the spring body 1 are pressed against the packaging bag and are in a pre-compressed state. In the pre-compressed state, the compression of the spring body 1 is 20-40% of its free height. The free height of the spring body is 70-100mm, preferably 85mm. By pre-compressing the spring body 1 inside the packaging bag, the top portion of the first coil 11 is closed. When the pocket spring assembly is used in a pillow, the spring body 1 provides an initial soft touch to the user after their head contacts the pillow, thereby improving the user's experience.

[0035] The spring body 1 is a spring made of wound metal wire. The spring body 1 can be made of steel wire with a tensile strength greater than or equal to 1770 MPa and a diameter of 0.6~1.2 mm. The outer diameter of the spring body 1 is 30.5~57 mm, ensuring sufficient fatigue strength and thus improving the service life of the pocket spring assembly. The spring body 1 is wound from a single metal wire, requiring no additional materials or processes. Only the pitch parameters of the first and second turns 11 in the winding process need to be changed to manufacture the spring body 1, reducing the production cost of the pocket spring assembly.

[0036] In one embodiment, the natural height of the spring body 1 is 85mm, the total effective number of coils n is 6, the wire diameter d of the spring body 1 is 0.8mm, the first pitch p1 is 9mm, and the spring body 1 is pre-compressed by 25mm after being placed in a bag. The height of the spring body 1 inside the bag is 60mm. Since all coils of the spring body 1 have the same stiffness, the pre-compression is evenly distributed to each coil, and the pre-compression amount per coil is 25 / 6 = 4.167mm. The total compressible space per coil of the first coil segment 11 is p1-d = 9-0.8 = 8.2mm. After deducting the pre-compression, the remaining compressible space per coil is 8.2-4.167 = 4.033mm. The total remaining space for the three coils of the first coil segment 11 is 12.1mm.

[0037] The complete mechanical properties of the spring body 1 under compression can be divided into two stages: In the first stage, each coil of spring body 1 is in the fully active state, corresponding to the user lying on their back and initial contact. Calculated from the free state, when each coil of spring body 1 is compressed to 8.2mm, the first coil segment 11 closes, at which point the total compression is 6 × 8.2 = 49.2mm. Calculated from the time spring body 1 is placed in the bag, the compression after user application is 49.2mm. The step jump is triggered after 25 = 24.2 mm. During this stage, the total stiffness remains at K6 = 0.01047 N / mm, and the spring body 1 provides soft and uniform support, exhibiting high conformity. The closing trigger force is 0.515 N.

[0038] In the second stage, which corresponds to the user sleeping on their side or under heavy pressure, after the first segment 11 closes, the stiffness instantly jumps to K3=0.02093N / mm, which is twice that of the first stage. At this time, the remaining compressible space of each ring of the second segment 12 is (19-0.8)-8.2=10.0mm, and the three rings still have a deep strong support stroke of 30.0mm.

[0039] The final fully engaged force is 0.515 + 0.02093 × 30.0 = 1.143 N. Compared with the conventional equal-pitch spring with the same parameters and a maximum engaged force of about 0.873 N, the ultimate support force of the spring body 1 of this invention is significantly improved by 30.9%, greatly reducing the risk of hitting the bottom while sleeping on one's side.

[0040] Corresponding to the aforementioned application function implementation device embodiments, this application also provides a pillow and corresponding embodiments.

[0041] See Figure 1 and Figure 2 The pillow comprises at least a first layer 2, a second layer 3, and a third layer 4. The second layer 3 is a spring layer consisting of multiple pocket spring assemblies arranged in a specific pattern, sandwiched between the first layer 2 and the third layer 4. The first layer 2 is located above the third layer 4, and it covers the sides of the spring layer. The first layer 2 provides facial comfort and initial support, while the third layer 4 provides bottom support and cushioning.

[0042] This application, by setting a first coil segment 11 and a second coil segment 12 in the spring body 1, with the second pitch being greater than the first pitch, allows the first coil segment 11 to preferentially close into a rigid body when the pocket spring assembly is pressed down. This results in a step-like increase in the stiffness of the spring body 1, achieving a two-stage nonlinear mechanical characteristic from soft and conforming to deep, firm support. A single spring body 1 can achieve this nonlinear transition from soft to firm without the need for mixing springs of different specifications. Compared to traditional equal-pitch springs, the ultimate support force of the spring body 1 is approximately 30.9% higher. During user use, the spring body 1 is softer before closing, thus improving the user's experience. When the user sleeps on their side, the pillow provides approximately 30mm of support and cushioning travel under deep pressure, effectively preventing the user from hitting the bottom and expanding the user's body shape adaptability range. The spring layer works in conjunction with the first layer 2 and the third layer 4. The spring layer provides point-to-point independent response and nonlinear stiffness variation, while the first layer 2 provides surface support, achieving micro-regional self-adaptation.

[0043] In some embodiments, the first layer 2 is the upper sponge layer, and the third layer 4 is the lower sponge layer. The density of the first layer 2 and / or the third layer 4 is 35~80 kg / m³. 3 Preferably, the density of the third layer 4 is greater than that of the first layer 2, making the hardness of the third layer 4 higher than that of the first layer 2. This ensures that the third layer 4 can firmly support the user's head as well as the first layer 2 and the second layer 3, guaranteeing the stability of the overall pillow structure.

[0044] The thickness of the first layer 2 is 30~40mm, and the thickness of the third layer 4 is 20~30mm. The thickness of the first layer 2 is greater than that of the third layer 4. When the user's head is pressed on the pillow, it can effectively prevent the top of the spring from causing a foreign object sensation on the user's head, thereby improving the user's experience.

[0045] The pocket spring assembly employing the present invention will be further described in detail below using specific embodiments and comparative examples. The following embodiments are illustrative and do not limit the scope of this application.

[0046] Example 1 See Figure 3 The first coil segment 11 and the second coil segment 12 are made of the same metal wire. The diameter d of the metal wire in the spring body 1 is 0.8 mm, the mean diameter D of the spring body 1 is 40 mm, the spring index c=D / d is 50, and the total effective number of coils n in the spring body 1 is 6. The material of the spring body 1 is SWP-B high carbon piano wire with a shear modulus G of 78,500 MPa. The number of coils n1 in the first coil segment 11 is 3, and the first pitch p1 is 9 mm; the number of coils n2 in the second coil segment 12 is 3, and the second pitch p2 is 19 mm; the pitch ratio p2 / p1 is 2.11. The free height verification is: H0=n1×p1+n2×p2+1mm (end thickness)=3×9+3×19+1=85 mm. The bag height is set at 60 mm, and the pre-compression amount is 25 mm.

[0047] Comparative Example 1 See Figure 4 This comparative example provides a traditional equal-pitch spring with the following specific parameters: wire diameter d = 0.8 mm; spring mean diameter D = 45 mm; spring index c = D / d = 56.25; total effective coils n = 4; wire material is SWP-B high-carbon piano wire with a shear modulus G of 78,500 MPa. The pitch p3 between adjacent coils is 14 mm. Free height verification: H1 = 6 × 14 + 1 = 85 mm. The bagging height is set at 60 mm, and the pre-compression is 25 mm.

[0048] Comparative Example 2 This comparative example provides a traditional equal-pitch spring with the following specific parameters: wire diameter d = 0.8 mm; spring mean diameter D = 40 mm; spring index c = D / d = 50; total effective coils n = 6; wire material is SWP-B high-carbon piano wire with a shear modulus G = 78,500 MPa; and the spring pitch p4 between adjacent coils is 14 mm. Free height verification: H2 = 6 × 14 + 1 = 85 mm. The bagging height is set at 60 mm, and the pre-compression is 25 mm.

[0049] The following performance tests were performed on Example 1 and Comparative Example 1: See Figure 3 In Example 1, the single-turn stiffness of the spring body 1 is calculated according to the formula for helical spring mechanics: k = G × d 4 / (8 × D³). Substituting the parameters G=78500MPa, d=0.8mm, and D=40mm, we can obtain the single-coil stiffness k=0.06280N / mm. The spring coils are mechanically connected in series. Initially, all 6 coils are fully operational, with a total stiffness of K6=k / 6=0.01047N / mm. When the first coil segment 11 closes, only the second coil segment 12 is operational, resulting in a sudden change in overall stiffness: K3=k / 3=0.02093N / mm. The stiffness ratio is K3 / K6=2.0, meaning the stiffness immediately doubles after coil closure. When the wire diameter d and mean diameter D are consistent throughout, different pitches do not affect the initial stiffness of each coil, only the compressible space of that coil. The denser coils use up the space first and close, while the sparser coils continue to operate, resulting in a step change in stiffness.

[0050] See Figure 4 In Comparative Example 1, the single-turn stiffness of the equal-pitch spring is calculated as follows: Substituting the parameters G=78,500MPa, d=0.8mm, and D=45mm, according to the formula k = G × d 4 The stiffness of a single coil can be obtained from (8 × D³) as k′≈0.04411 N / mm. Since the effective number of coils n′ of the comparison spring is only 4, its total stiffness remains constant throughout the entire stroke, and is calculated as: K′=4k′≈0.01103 N / mm.

[0051] In Comparative Example 2, the single-turn stiffness of the equal-pitch spring is calculated as follows: Substituting the parameters G=78500MPa, d=0.8mm, and D=40mm, according to the formula k = G × d 4 The stiffness of a single coil can be obtained from (8 × D³) as k = 0.06280 N / mm. The coils of the spring are mechanically connected in series. Initially, all 6 coils are fully engaged, and the total stiffness is: K6 = k / 6 = 0.01047 N / mm.

[0052] The following is a performance comparison between Example 1 and Comparative Example 1: 1. Comparison of initial pre-compression force: In the initial state with a bag height of 60mm (pre-compression amount of 25mm), the initial support force of the equal-pitch spring in Comparative Example 1 is F0′=0.01103×25≈0.276N; the initial support force of the equal-pitch spring in Comparative Example 2 is F0′′=0.01047×25≈0.262N; while the spring body 1 of the present invention, due to its 6-coil design, has a lower initial total stiffness, and its initial support force is F0=0.01047×25≈0.262N. Calculations show that the spring body 1 of the present invention provides approximately 5% lighter pressure feedback in the initial contact phase compared to the large-diameter spring of Comparative Example 1, offering a superior sense of enclosure and pressure reduction effect.

[0053] 2. Comparison of ultimate support force: When the compressed displacement continues to increase until it approaches the physical limit, the free height minus the diameter of 6 turns of metal wire equals a compression amount of 79.2mm. The user-available stroke after pre-compression is 79.2mm. 25 = 54.2 mm, where the supporting force of the equal-pitch spring in Comparative Example 1 increases linearly to Fmax′=0.01103×79≈0.873N, and the supporting force of the equal-pitch spring in Comparative Example 2 increases linearly to Fmax′=0.01047×79≈0.829N; while the spring body 1 of the present invention triggers a doubling step of stiffness at a compression of 24.2 mm, and its final supporting force reaches 1.143N.

[0054] The relevant experiments were conducted on Example 1 and Comparative Example 1 above, and the specific experimental results are shown in Table 1 below: Table 1

[0055] See Figure 5 In summary, through the above calculations and comparisons, it can be seen that the spring body 1 of the present invention achieves a softer initial state than the traditional equal-pitch spring by combining the logic of increasing the number of coils to reduce the initial stiffness and changing the pitch to increase the final stiffness. Under the same material parameters (d, D, n, G) and packaging conditions, the spring body 1 of the present invention has a higher end support force than the equal-pitch spring of Comparative Example 1 by approximately (1.143-0.873) / 0.873=30.9%. Compared with the equal-pitch spring of Comparative Example 2, the ultimate support force of the spring body 1 of the present invention increases from 0.829N to 1.143N, an increase of (1.143-0.829) / 0.829=37.9%. This non-linear support characteristic effectively solves the shortcomings of the traditional equal-pitch spring, which is too stiff at the beginning and has a tendency to bottom out under deep pressure.

[0056] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0057] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A pocket spring assembly, characterized in that, include: The spring body is an unequal pitch spring, which includes a first coil segment and a second coil segment. One end of the first coil segment is connected to one end of the second coil segment. The first coil segment is located above the second coil segment. The first coil segment has a first pitch, and the second coil segment has a second pitch, which is greater than the first pitch. The overall stiffness of the spring body undergoes a step change when the first coil segment is subjected to axial pressure and reaches the closed coil state. A package bag that encloses the spring body.

2. The pocket spring assembly according to claim 1, characterized in that: The ratio of the second pitch to the first pitch is 1.5 to 3.

3. The pocket spring assembly according to claim 1, characterized in that: The effective number of coils of the spring body is 4 to 8; wherein, the effective number of coils of the first coil segment is 2 to 4, and / or, the effective number of coils of the second coil segment is 2 to 4.

4. The pocket spring assembly according to claim 1, characterized in that: The two opposite ends of the spring body press against the package bag and are in a pre-compressed state. In the pre-compressed state, the compression of the spring body is 20-40% of the free height of the spring body.

5. The pocket spring assembly according to claim 1 or 4, characterized in that: The free height of the spring body is 70~100mm.

6. The pocket spring assembly according to claim 1, characterized in that: The spring body is a spring made of metal wire coiled together, and the tensile strength of the metal wire is greater than or equal to 1770 MPa.

7. The pocket spring assembly according to claim 1, characterized in that: The spring body is a spring made of metal wire coiled together, and the diameter of the metal wire is 0.6~1.2mm.

8. The pocket spring assembly according to claim 1, characterized in that: The outer diameter of the spring body is 30.5~57mm.

9. The pocket spring assembly according to claim 1, characterized in that: The ratio of the reaction force of the spring body when compressed by 30mm to the reaction force of the spring body when compressed by 20mm is 1.4 to 1.

7.

10. A pillow, characterized in that: It includes at least the first, second, and third layers; The second layer is a spring layer comprising a plurality of bag spring assemblies arranged as described in any one of claims 1 to 9. The second layer is sandwiched between the first layer and the third layer.

11. The pillow according to claim 10, characterized in that: The first layer is the upper sponge layer, and the third layer is the lower sponge layer; the density of the first layer and / or the third layer is 35~80 kg / m³. 3 .

12. The pillow according to claim 11, characterized in that: The thickness of the first layer is 30-40 mm, and the thickness of the third layer is 20-30 mm.

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