JP3009349B2 - Spring structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a spring structure used for a mattress or the like.

[0002]

2. Description of the Related Art Generally, a mattress has a rectangular spring structure formed by arranging a large number of coil springs in a matrix and connecting upper and lower end portions of adjacent coil springs with helical wires.

The mattress is constructed by laminating a sheet-like elastic material on at least the upper and lower surfaces of the spring structure and covering the laminated body with a bag-like sewn cloth outer body. . On the upper and lower peripheral edges of the spring structure, a frame line formed of a hard wire is used to reduce the degree of connection of the coil spring, reinforce the coil spring in the peripheral portion, or maintain the outer shape of the mattress. It is provided.

[0004] The mattress thus constructed is used by being placed on a floor plate provided on a bed base. Beds include so-called wake-up beds that are used by people who are difficult to get up on their own, such as sick and elderly people.

[0005] In the wake-up type bed, a floor plate is divided into a plurality of floor portions, and a floor portion corresponding to the back of the user, ie, a raised floor portion, is rotatably provided. The raised floor is driven up and down by a driving device. Therefore,
A user who lies on the floor panel via a mattress is raised in the upper body by driving the back-raising floor portion in the rising direction.

[0006] The mattress used in such a wake-up bed must have a structure that bends according to the rising of the raised floor portion of the floorboard. However, as described above, in the spring structure, adjacent end faces of the coil springs arranged in a rectangular shape are connected by a helical wire.

Therefore, when the user raises the back-raising floor in order to raise the user's upper body, a large tensile force is generated on the lower surface side in the thickness direction of the mattress spring structure bent accordingly. . Since the end faces of the coil springs adjacent to each other in the longitudinal direction are connected by a helical wire, the spring structure generates a large resistance to the tensile force. Therefore, even when the back raising floor is raised, the spring structure, that is, the mattress may not be smoothly bent.

Accordingly, the present applicant has filed Japanese Patent Application No. 5-8852.
The mattress device shown in No. 2 was proposed. In this mattress device, coil springs are arranged in a rectangular shape, and adjacent end faces of the coil springs are connected by a helical wire, and the spring unit of the coil spring end face on the lower surface side of the spring unit (spring assembly) is connected to the spring unit. The connection by the helical wire along the longitudinal direction of the spring unit is released so that no tensile force is generated on the lower surface side of the spring unit when bent.

According to such a configuration, the mattress can be smoothly bent when the back-raising floor is raised. However, if the lower end face of the coil spring constituting the spring unit is released from the coupled state, the spring unit may be bent,
When extending, for example, the end faces of adjacent coil springs whose coupling state has been released may collide with each other to generate noise, which may cause discomfort to the user.

[0010]

As described above, in the conventional spring structure, the connection state of the end faces of the adjacent coil springs by the helical wire is released in order to be easily bent. When the spring structure from which the is released is bent or extended, the end faces of adjacent coil springs may collide with each other and generate noise.

The present invention has been made based on the above circumstances, and an object of the present invention is to release the joined state of the end faces of adjacent coil springs to facilitate bending, and to bend or extend the coil springs. Another object of the present invention is to provide a spring structure in which end faces of adjacent coil springs do not collide with each other.

[0012]

In order to solve the above-mentioned problems, the invention described in claim 1 is characterized in that end portions at both ends of a spring portion are provided.
A number of coil springs with
Connect the end faces of the coil springs with
In the formed spring structure, this spring structure
One of the above coil springs in the middle of the body in the longitudinal direction
The length of the spring assembly by the connecting member at the end face of
Form a release part that releases the hand-connected state, and
One end face of the coil spring is
By bending the part radially inward to form a recess,
A gap is formed between adjacent end surfaces in the longitudinal direction.
And one end face of the coil spring
Is provided with a cushioning member having a cushioning portion that enters the gap.
The spring structure is characterized in that the spring structure is provided.

According to a second aspect of the present invention, both the spring portions are provided.
Numerous coil springs with end faces at the ends
Arrange and connect the end faces of adjacent coil springs
In the spring structure formed by
In the middle of the spring structure in the longitudinal direction, the coil split
The spring provided by the connecting member on one end of the spring.
Forming a release part that releases the connection state in the longitudinal direction of the
And release one end of the coil spring at the release
By forming it with a smaller diameter than the end face,
A gap is formed between adjacent end faces
On one end face side of the coil spring,
It is provided with a buffer member having a buffer portion that enters the gap portion
A spring structure characterized in that: Claim 3
The invention described in the publication has a large number of springs having end faces at both ends.
Coil springs are arranged in a rectangular shape, and adjacent coil springs
Spring formed by joining the end faces of the
In a ring structure, the spring structure
In the middle, the one end face of the coil spring
Connection of the spring structure in the longitudinal direction by a connecting member
The release part is released and the coil spring of this release part is
One end face of the ring is formed in an elliptical shape and
Position the end axis along the length of the spring structure.
In this way, there is a gap between the end faces adjacent in the longitudinal direction.
A gap is formed and one of the above coil springs
On the side of the end face, there is a buffer portion that enters the gap
A spring structure provided with a buffer member
It is in.

[0014]

According to the first to third aspects of the present invention , a gap is formed between the adjacent end faces of the coil spring in which the coupling state is released, and the gap of the cushioning member is formed in the gap.
Interposed, the adjacent end faces collide and the noise
Sound can be prevented from being generated.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a first embodiment of the present invention, and FIG. 6 shows a rising bed 1. The wake-up bed 1 includes a base 2 formed in a rectangular frame shape and having a headboard 2a at one longitudinal end and a footboard 2b at the other end. At the four corners of the lower surface of the base 2, casters 3 with stoppers for supporting the base 2 so as to be able to travel are provided, and on the upper surface, a floor plate 4 divided into a plurality in the longitudinal direction is provided. In this example, the floor panel 4 is divided into first to fourth four floor panel sections 4a to 4d.

The floor plate 4 is located at a distance of 2 from the headboard 2a side.
The second floor plate portion 4 b is fixed to one of the two horizontal rails 5 laid in the width direction of the base 2. A first floor plate 4a and a third floor plate 4c are provided at both ends of the floor plate 4b.
And a fourth floor plate portion 4d is pivotally connected to the third floor plate portion 4c.

One end of each of a pair of arms 6 (only one is shown) is fixed to the pair of horizontal rails 5 at predetermined intervals in the longitudinal direction. A first shaft 7 and a second shaft 8 are rotatably supported by a pair of arms 6 of each cross rail 5. One end of a first lever 9 is fixed to a first shaft 7 located on the headboard 2a side, and a second
One end of the lever 11 is fixed. Each lever 9, 1
At the other end of the roller 1, a roller 12 is rotatably provided.

The roller 12 provided on the first lever 9 is in rolling contact with the first slope 13 provided on the lower surface of the first floor plate 4a, and is provided on the second lever 11. The roller 12 is in rolling contact with a second slope 14 provided on the lower surface of the third floor plate portion 4c. Further, a third surface is provided on the lower surface of the fourth floor plate portion 4d.
One end of the lever 15 is pivotally mounted. The other end of the third lever 15 is pivotally connected to the base 2.

A driving device 16 indicated by a chain line is provided on the lower surface side of the base 2. The driving device 16 drives the first shaft 7 and the second shaft 8 to rotate. When the first shaft 7 is driven in the clockwise direction indicated by the arrow, the first lever 9 interlocking with the first shaft 7 drives the first floor plate portion 4a of the floor plate 4 in the upright direction, and the second shaft 8 moves in the arrow direction. Is driven in the counterclockwise direction, the third floor plate portion 4c is driven in the upright direction by the second lever 11 interlocked therewith. This third
The fourth floor panel 4d is also driven in the upright direction in conjunction with the third floor panel 4c, and is held by the third lever 15 so as to form a substantially mountain shape with the third floor panel 4c.

The floor plate 4 of the wake-up type bed 1 having such a configuration.
A mattress 20 using the spring structure 21 according to the present invention is mounted thereon. This mattress 20
Is provided with the above-mentioned spring structure 21 having a rectangular planar shape as shown in FIGS. The spring structure 21 has a rectangular shape with a number of coil springs 22 arranged in a matrix. The above coil spring 2
As shown in FIGS. 1 and 4, reference numeral 2 comprises a spring portion 22a, an upper end portion 22b and a lower end portion 22c formed continuously at both ends of the spring portion 22a. Each end face part 22b, 22c is formed in an annular shape.

The lower end portion 22c of the coil spring 22, which is located in the middle part of the sprib structure 21 in the longitudinal direction, has a concave portion 22d formed by bending a part of an annular shape radially inward. Therefore, a gap 23 is provided between the lower end face 22c adjacent via the recess 22d in the middle of the lower surface of the spring structure 21 in the longitudinal direction as shown in FIGS.
Are formed.

The above-mentioned spring assembly 21 is composed of an upper end surface 22b and a lower end surface 22c of an adjacent coil spring 22.
Are connected by a helical wire 24, respectively. The helical wire 24 is provided along the width direction of the spring structure 21, and connects the adjacent coil springs 22 in the width direction and the longitudinal direction of the spring structure 21.

In the middle of the lower surface side of the spring structure 21, that is, the portion where the coil spring 22 having the concave portion 22d formed in the lower end surface portion 22c is located,
Of the helical wire 24 along the longitudinal direction is released. This release unit 25
When the above-mentioned spring structure 21, that is, the mattress 20 is bent, a tensile force is prevented from being generated on the lower surface side outside the bend. Therefore, the mattress 20 can be smoothly bent.

Since the lower end surface 22c of the coil spring 22 of the release portion 25 along the width direction of the spring structure 21 is connected by the helical wire 24, each coil spring 22 swings in the width direction of the spring structure 21. Has been blocked.

At both ends of the upper and lower peripheral edges of the spring structure 21 except for both sides of the release portion 25, frame lines 26 each formed by bending a wire material harder than the coil spring 22 into a U-shape are provided at clips 27. Are linked by
The frame structure 26 reinforces both ends in the longitudinal direction of the upper and lower peripheral edges of the spring structure 21. Further, since the frame 26 is not provided at a portion corresponding to the release portion 25 of the spring structure 21, the flexibility, that is, the softness of the release portion 25 is not impaired by the frame 26.

As shown in FIG. 1, a soft or semi-hard synthetic resin sheet such as a synthetic resin sheet, for example, is provided on the lower surface side of the spring assembly 21, that is, on the lower end surface portion 22a side of the coil spring 22 corresponding to the release portion 25. Vinyl chloride
A sheet-shaped cushioning member 31 made of metal is joined and held by the clip 30. In this cushioning member 31, a bellows-like cushioning portion 32 is formed so as to extend over substantially the entire length of the spring structure 21 in the width direction, and at substantially the same interval as the pitch of the coil spring 22 in the longitudinal direction. In this embodiment, the buffer member 31 is divided into three pieces in the longitudinal direction of the spring structure 21 as shown in FIG. 5, but one piece may be used.

The buffer portion 32 is inserted into the gap 23 of the release portion 25. That is, the buffer portion 32 is interposed between the lower end surface portion 22c of the coil spring 22 of the release portion 25 of the spring structure 21. Accordingly, the buffer portion 32 is formed by the lower end surface portion 22c of the coil spring 22 adjacent to the release portion 25 in the longitudinal direction of the spring structure 21 of the release portion 25 released from the connection state by the helical wire 24.
Are preventing direct collisions.

[0029] As shown in FIG.
A sheet-like elastic material 33 made of urethane foam or the like is bonded to the upper and lower surfaces of the upper and lower surfaces via a fabric 34 such as a stretchable knit, and the elastic material 33 is covered with an exterior body 35. Thereby, the mattress 20 is configured.

According to the wake-up bed 1 using the mattress 20 constructed as described above, the driving device 16 is operated to raise the upper body of the user who is lying on the mattress 20, and the first floor plate portion 4a is activated. Is raised, the mattress 20 on the floorboard 4 is bent from the middle part in the longitudinal direction in accordance with the rising.

An intermediate portion in the longitudinal direction of the spring structure 21 constituting the mattress 20 is formed as a release portion 25 in which the coupling of the lower end surface portion 22c of the coil spring 22 along the longitudinal direction by the helical wire 24 is released. For this reason, even if the spring structure 21 is bent by raising the first floor plate portion 4a, no tensile force (reaction force against bending) is generated on the lower surface side outside the bending, so that the spring structure 21 is It will be surely bent with a light force.

The release portion 25 is provided with the coil spring 22
When the spring structure 21 is bent, the lower end surface portions 22c of the coil springs 22 adjacent to each other in the longitudinal direction of the spring structure 21 may collide with each other and generate noise. There is.

However, the cushioning member 31 is joined to the release portion 25 with the cushioning portion 32 interposed in the gap 23 between the lower end surface portions 22c. Therefore, the buffer 32
This prevents the adjacent lower end surface portions 22c from directly colliding with each other, so that when the spring structure 21 is bent, noise can be prevented from being generated.

In addition, since the buffer portion 32 is formed in a bellows shape, when the spring structure 21 is bent, it expands in accordance with the bending, so that the bending of the spring structure 21 is also prevented. There is nothing.

FIG. 7 shows a second embodiment of the present invention.
In this embodiment, a non-woven fabric, vinyl laser, polypropylene sheet, acrylic sheet, cloth, or the like is used as the cushioning member 41, and the cushioning member 41 is loosened to form a buffer portion 42, and the buffer portion 42 is a coil spring. 22 is inserted into the gap 23 between the lower end faces 22c. In addition,
The buffer member 41 is held on the lower surface of the spring structure 21 by the clip 30 as in the first embodiment.

Even with such a cushioning member 41, the same operation and effect as those of the first embodiment can be obtained.
FIG. 8 shows a third embodiment of the present invention. The buffer member 51 of this embodiment is formed of a thin sheet-like urethane foam, and the buffer section 52 is also formed of a strip-like urethane foam. The buffer portion 52 is erected and fixed on the upper surface of the buffer member 51, and is inserted into the gap 23 between the lower end portions 22c of the coil spring 22.

Although the buffer section 52 is fixedly bonded to the buffer member 51, they may be integrally formed. The present invention is not limited to the above embodiments, and can be variously modified without departing from the gist of the invention. For example, in the above embodiment, by forming a concave portion in the lower end surface portion of the coil spring, a gap portion is formed between adjacent lower end surface portions, and the buffer portion of the cushioning member is inserted there, but without forming the concave portion, If the cushioning member is formed of a thin sheet, the cushioning portion of the cushioning member can be inserted between the lower end surfaces of the adjacent coil springs.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. Note that the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. That is, the fourth embodiment is a modification of the spring structure 21A. The spring structure 21A of this embodiment has a first structure.
, And a second col spring 62. The first coil spring 61 has end face portions 61b formed above and below a coil portion (not shown),
Reference numeral 61c denotes a drum-shaped coil spring having the same diameter, and the second coil spring 62 has a lower end surface portion 62c formed at the lower end of the coil portion 62a having a smaller diameter than the upper end surface portion 62b as shown in FIGS. It is a formed coil spring having a different diameter.

The spring structure 21A includes a first spring portion 63 having the first coil springs 61 arranged in a matrix, and a second spring portion having the second coil springs 62 arranged in a matrix. The parts 64 are arranged alternately in the longitudinal direction. That is, in this embodiment, the first spring portion 63 is disposed at both ends and the center of the spring structure 21A in the longitudinal direction, and the second spring portion 64 is disposed at two positions in the middle in the longitudinal direction. Become.

A frame line 26a formed by bending a steel wire into a U-shape is connected by clips 27 to the upper and lower peripheral edges of the pair of first spring portions 63 located at both ends of the spring structure 21A. Except for one side on the lower surface side of the first spring portion 63 located at the center, the three sides are
a is connected by a clip 27, and linear frame lines 26 b are connected by clips 27 on both sides of the upper surface.

The first spring portion 63 is formed by connecting the upper and lower end surfaces 61b and 61c adjacent to each other in the longitudinal direction of the spring structure 21A of the first coil spring 61 with the helical wire 2.
4.

In the second spring portion 64, the upper end surface portion 62b of the second coil spring 62 adjacent in the longitudinal direction of the spring structure 21A is connected by the helical wire 24 on the upper surface side, and the spring structure 21A on the lower surface side. A release portion 25A is formed in which the connection by the helical wire 24 along the longitudinal direction is released. That is,
In the release portion 25A, the lower end surface portion 62c of the second coil spring 62 is connected by the helical wire 24 only along the width direction of the spring structure 21A.

Further, on the lower surface side of the second spring portion 64, since the lower end surface portion 62c of the second coil spring 62 is formed to have a smaller diameter than the upper end surface portion 62b, a gap is formed between the adjacent lower end surface portions 62c. 23A are formed.

Then, the spring structure 21A having the above-mentioned structure is provided.
As shown in FIGS. 13 and 14, one cushioning member 31 having a cushioning portion 32 formed in the space 23A is joined to the lower surface of the cushioning member 31.

According to the mattress 20A shown in FIG. 14 constituted by using the spring structure 21A having the above-described structure,
As in the case of the mattress 20 of the first embodiment, the release portion 25A is formed in the spring structure 21A, so that the spring portion 21A can be bent with a light force, and the buffer portion 32 of the buffer member 31 enters the gap portion 23A. Therefore, even if the spring structure 21A is bent or extended, the lower end surface portion 62c of the second coil spring 62 at that portion is prevented from hitting, and no noise is generated.

Further, the lower end portion 62c of the second coil spring 62 has a smaller diameter than the upper end portion 62b, and the gap 23A is formed between the adjacent lower end portions 62c.
Since it becomes easy to insert the buffer portion 32 of the buffer member 31,
Workability during assembly can be improved.

FIG. 15 shows a fifth embodiment of the present invention. This embodiment is a modification of the fourth embodiment. That is, the lower end portion 62c of the second coil spring 62 of the second spring portion 64 is connected to the straight hard steel wire 71 instead of the helical wire 24. The above hard steel wire 71
Is provided along the width direction of the spring structure 21A, and is connected to the lower end surface portion 62c of the second coil spring 62 along the width direction by a clip 72.

The lower end surface portion 6 of the second coil spring 62
2c is connected by a hard steel wire 71, each coil spring 6
2 can be prevented from swinging in the width direction of the spring structure 21A.

FIG. 16 shows a sixth embodiment of the present invention. This embodiment is a modification of the second coil spring 162 forming the second spring portion 64. The coil spring 162 includes a coil portion 162a, a circular upper end portion 162b, and an elliptical lower end portion 162c. The lower end face portion 162c is arranged with its elliptical minor axis direction along the longitudinal direction of the spring structure 21A.

As a result, in the second spring portion 64, a gap 23A is formed between the lower end surface portions 162c adjacent to each other along the longitudinal direction of the spring structure 12A.

FIG. 17 shows a sixth embodiment of the present invention. This embodiment is different from the first embodiment in that coil springs 22 adjacent to each other along the longitudinal direction of a spring structure 21 are arranged.
The connection in the width direction of the lower end surface portion 22c of the release portion 25 having released the connection of the lower end surface portion 22c of the
Instead, the hard steel wire 81 and the hard steel wire 81 are connected to the lower end face portion 22c with a clip 82.

FIG. 18 shows a seventh embodiment of the present invention. In this embodiment, a bar 83 made of resin is used instead of the hard steel wire 81 of the sixth embodiment. The bar 83 has a substantially U-shaped cross section,
2c is provided so as to be elastically engaged therewith. That is, since the bar 83 only needs to be elastically engaged with the lower end surface 22c, its attachment is easy.

FIG. 19 shows an eighth embodiment of the present invention. This embodiment is a modification of the second embodiment shown in FIG. 7, in which a buffer portion 42A formed in a buffer member 41 and inserted into a gap 23 is provided with an upper end surface portion 22b
, And is connected to the upper end surface portion 22b with a clip (not shown) or the like.

[0054]

[0055]

[0056]

According to the first to third aspects of the present invention,
A gap is formed between the adjacent end faces of the coil spring, and the buffer section of the cushioning member is inserted therein, so that the gap between the end faces of the adjacent coil springs is less likely to collide than when there is no gap. In addition, since the buffer portion of the buffer member inserted between the end surface portions of the coil spring is less likely to be compressed by the end surface portion, there is an advantage that the performance of the buffer portion can be maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a side view showing a part of a spring structure according to an embodiment of the present invention.

FIG. 2 is a plan view showing a part of the lower surface side of the spring structure.

FIG. 3 is a plan view showing the upper surface side of the spring structure.

FIG. 4 is a perspective view of the same coil spring.

FIG. 5 is a plan view showing a state in which a buffer member is joined to the lower surface side of the spring structure.

FIG. 6 is a side view of the wake-up bed.

FIG. 7 is a side view showing a part of a spring structure according to a second embodiment of the present invention.

FIG. 8 is a side view showing a part of a spring structure according to a third embodiment of the present invention.

FIG. 9 is a plan view of a lower surface side of a spring structure according to a fourth embodiment of the present invention.

FIG. 10 is a plan view of the upper surface side of the same spring structure.

FIG. 11 is an enlarged view of a part on the lower surface side of the spring structure.

FIG. 12 is a perspective view of the same coil spring.

FIG. 13 is a plan view of the lower surface side of the spring structure to which the cushioning material is similarly joined.

FIG. 14 is an enlarged sectional view of a part of the mattress.

FIG. 15 is a plan view of a lower surface side of a spring structure according to a fifth embodiment of the present invention.

FIG. 16 is a perspective view of a coil spring showing a sixth embodiment of the present invention.

FIG. 17 is an enlarged plan view of a part of a spring structure according to a seventh embodiment of the present invention.

FIG. 18 is an enlarged plan view of a part of a spring structure according to an eighth embodiment of the present invention.

FIG. 19 is an enlarged plan view of a part of a spring structure according to a ninth embodiment of the present invention.

[Explanation of symbols]

22: coil spring, 22a: spring portion, 22b, 22c: end face portion, 24: helical wire (connection member), 25: release portion,
31: buffer member, 32: buffer section.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tatsuo Kamata 1148 Nakagamicho, Akishima-shi, Tokyo France Bed Co., Ltd. Tokyo factory (56) References JP-U 6-77609 (JP, U) JP-U 63- 159550 (JP, U) Japanese Patent Publication No. 54-14536 (JP, B2) Japanese Patent Publication No. 5-10523 (JP, B2) Japanese Utility Model Showa 57-36053 (JP, Y2) Japanese Utility Model Showa 64-6145 (JP, Y2) 62-28941 (JP, Y2) Jong 48-3688 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47C 27/04-27/07 A47C 23/043

Claims (3)

(57) [Claims] A plurality of springs having end portions at both ends of a spring portion;
The coil springs are arranged in a rectangular shape.
A splice formed by joining the end faces of the ring with a connecting member
In the spring structure, the above-mentioned coil
The spring is formed by the connecting member on one end face of the spring.
Release part that released the coupling state in the longitudinal direction of the pulling structure
Formed and released on one end face of the coil spring
Is formed by bending a part of the ring radially inward to form a recess.
By forming, between end face parts adjacent in the longitudinal direction
A gap is formed in the coil spring, and
On one end face side, there is a buffer part to enter the gap.
Characterized in that a spring member is provided.
Structure. 2. A large number of cores having end portions at both ends of a spring portion.
The coil springs are arranged in a rectangular shape.
A splice formed by joining the end faces of the ring with a connecting member
In the spring structure, the above-mentioned coil
The spring is formed by the connecting member on one end face of the spring.
Release part that released the coupling state in the longitudinal direction of the pulling structure
Formed and released on one end face of the coil spring
By forming a smaller diameter than the other end surface,
To form a gap between the end faces adjacent in the direction
In addition, on one end face side of the coil spring,
Do not provide a cushioning member having a cushioning part that enters the gap.
A spring structure characterized in that: 3. A large number of cores having end portions at both ends of a spring portion.
The coil springs are arranged in a rectangular shape.
A splice formed by joining the end faces of the ring with a connecting member
In the spring structure, the above-mentioned coil
The spring is formed by the connecting member on one end face of the spring.
Release part that released the coupling state in the longitudinal direction of the pulling structure
Formed and released on one end face of the coil spring
Is formed in an elliptical shape, and the direction of the end axis of the ellipse is springed.
By arranging along the longitudinal direction of the structure,
A gap is formed between adjacent end faces in the direction
To, on one end face side of the coil spring, the
It is provided with a buffer member having a buffer portion that enters the gap portion
A spring structure, characterized in that: