JPH09229269A - Hose clip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make fastening force for a hose uniform along the whole periphery thereof by gradually twisting a spring plate and crossing both ends and giving second moment of area at an arbitrary point such that it satisfies a specific formula. SOLUTION: A hose clip HC is gradually twisted along the axial direction in a bending process when it is formed and is shaped like a spiral such that both ends cross when it is twisted one turn. But, since the inner diameter of a fastening part 1 is set sufficiently large compared with its plate axis, the fastening part 1 can be uniformly put into close contact with a hose H along the whole peripheral surface thereof by changing the second moment of area such that it satisfies a specific equation IZC=IZMAX.(1+cosθ)/2 (where IZMAX is the maximum value of second moment of area at a fulcrum part of a spring plate and θ is an angle between the supporting part and an arbitrary point), which can extend the life of the hose without partially deteriorating the hose.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hose clip.

[0002]

2. Description of the Related Art Conventionally, a hose clip HC1 of the type shown in FIG. 9 has been used for tightening a connecting portion of a hose connected to a pipe or the like. In this device, a long leaf-shaped spring plate material is bent in an annular shape so that it has an inner diameter smaller than the outer diameter of the target hose in a natural state. When tightening the hose, it is forcibly expanded and deformed and fitted into the hose, and then if the expanded diameter state is released, the hose is tightened by reducing its diameter by its own elasticity.
And so on.

By the way, this kind of hose clip HC1
The basic function required for the hose is that the tightening force on the hose is uniform over the entire circumference. However, even if a leaf spring material having a uniform width is simply bent into an annular shape, a uniform tightening force cannot be obtained. Therefore, conventionally, the triangular window 10 has been devised.

[0004]

However, it has been found that the above-mentioned prior art has room for improvement in the following points. First, although the triangular window 10 as described above provides uniform tightening force by changing the plate width, if it is provided, the contact area with the hose is not uniform in the circumferential direction. Therefore, the tightening force per unit area is determined by the knob pieces 12, 1
Different from the vicinity of 2 and other portions, a larger tightening load is applied to the outer peripheral surface of the hose per unit area near the knob pieces 5 and 12. As a result, the bite depth into the hose becomes uneven, and there is a concern that the hose may partially deteriorate.

As a second point, the conventional hose clip HC1 has a shape in which one end has one leg and the other end has a groove 11 for receiving the one leg portion. Has become. By doing so, the knob pieces 12 formed upright on both ends are made to face each other coaxially, and the knob operation is facilitated. However, in order to form such an operation portion, almost half circumference of the hose clip is formed. As a result, it was difficult to make the tightening force uniform.

The present invention was developed in view of the above circumstances, and an object thereof is to make the tightening force for the hose uniform over the entire circumference and at the same time make the load per unit area uniform. It is to provide a hoses clip.

[0007]

In order to achieve the above-mentioned object, the invention of claim 1 is a hose in which a long piece-shaped spring plate material is wound in an annular shape to exert an elastic force in a diameter reducing direction. The spring plate member is gradually twisted so that both ends of the spring plate member cross each other in a crosswise manner. The second moment of area IZ at an arbitrary point C is equal to IZC = IZMAX. (1 + COSθ) / 2 (IZMAX: maximum value of the second moment of area at the fulcrum of the spring plate, while making the contact area with the hose etc. uniform along the circumference. , Θ: an angle formed by the fulcrum portion and an arbitrary point C).

[0008]

The operation and effect of the first aspect of the present invention are as follows. FIG. 10 is a schematic diagram for performing a mechanical analysis in the case of expanding and deforming by applying an equal load to both ends of the hose clip, and considering a bending beam S corresponding to a half circumference of the hose clip. Now, load P at one end B
It is assumed that the bending beam S is deformed from the original state shown by the broken line to the state shown by the solid line when the above is applied. At this time, the bending beam S
The bending moment M acting on an arbitrary point C in the middle of is expressed by M = P · RC (1 + COSθ). Where RC is the radius of curvature at point C and θ is the angle that point C makes with the horizontal axis. On the other hand, when the bending beam is in the original state, the following expression holds when the radius of curvature at the point C0 which is the original position of the point C is RC0. (1 / RC)-(1 / RC0) = M / (E · IZ) ... However, E represents Young's modulus. Therefore, from the above, (1 / RC)-(1 / RC0) = P ・ RC (1 + COSθ) / (E ・ IZ) ... Also, the bending moment becomes maximum at point A, and point A
Since the second moment of area at the point is also the maximum value, IZMAX can be expressed as (1 / RA)-(1 / RA0) = 2 · P · RA / (E · IZMAX) ... By the way, in the hose clip In order to obtain a uniform tightening force over the entire circumference, the curvature change {(1 / R)-(1 / R0)} at any point must be constant. Therefore, (1 / RC)-(1 / RC0) = (1 / RA)-(1 / RA0) ... In other words, IZ = 1 / 2.IZMAX. (1 + COS.theta.). It can be seen that a uniform tightening force can be obtained along the entire circumference by changing the relationship according to the formula (see FIG. 10B).

According to the present invention, the shape of the leaf spring material is set with such a relationship, and thereby the tightening force for the hose or the like is made uniform. At the same time, when realizing such a shape, a method other than changing the plate width is used. In other words, by gradually twisting the spring plate material so that both ends cross each other in a crossed manner, it is possible to achieve a uniform contact area for the hose etc. along the entire circumference. The tightening force per unit area is also uniform.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show the first embodiment of the present invention, in which spring steel is used as the material of the hose clip. The hose clip HC is composed of a tightening portion 1 formed by bending a long plate material having a uniform width into a substantially annular shape, and an operating portion 2 formed by erecting its end portion at an equal height in the radial direction. ing.

As shown in FIG. 1, the hose clip HC is gradually twisted along the axial direction in the bending process during its molding, and both ends of the hose clip HC are misaligned when wound once. That is, it has a spiral shape as a whole. However, since the inner diameter of the tightening portion 1 is set sufficiently larger than the plate width thereof, the twist of the inner peripheral surface of the tightening portion 1 can be almost ignored.
Therefore, the tightening portion 1 can be brought into close contact with the outer peripheral surface of the hose H uniformly over the entire width thereof, and further, can be made to evenly adhere along the entire circumference thereof.

As described above, the condition for making the tightening force of the hose clip HC uniform along the entire circumference is to change the second moment of area so as to satisfy the following equation. IZ = 1/2 · IZMAX · (1 + COSθ) In the first embodiment, the tightening portion 1 is used as a means for this.
In the above, the ribs 3 of varying depth are formed so as to project outward. This rib 3
Is formed along the circumferential direction in the central portion in the width direction of the tightening portion 1, and the central position in the longitudinal direction (position P in FIG. 1, position corresponding to point A in FIG. 10) is deepest. It is formed (see FIG. 4 (A)), and is formed symmetrically and gradually shallower from here to both operating portions 2. That is, the position of the point P is set as the most difficult point to bend, and the point P is gradually made to bend easily.

Although not shown, the hose clip H
A suitable holder (not shown) is attached to both operation parts 2 in order to hold the whole C in the expanded state,
As a result, the hose clip HC can be carried in the expanded state.

Therefore, the first structure constructed as described above
In the embodiment, when tightening the hose H, the hose clip HC in the expanded diameter state is previously set to the hose H.
After connecting to a pipe or the like, the hose clip HC is moved to the mouth. Then, if the holder (not shown) is removed, the hose clip HC contracts and deforms due to its elasticity, so the hose H is tightened by the tightening portion 1, and the connection work to the hose H is completed.

By the way, in the hose clip HC of the first embodiment, the tightening force on the hose H is applied so as to be uniform over the entire circumference, and both operating parts 2 are crossed in a crossed manner, so that the tightening is performed. Since the portion 1 tightens the entire circumference of the hose H with a uniform width, the tightening force acting on the hose H per unit area is also uniform. Therefore, unlike the conventional case, the hose H is not locally deteriorated and contributes to prolonging the life of the hose H.

Further, in the prior art, when both operating portions 2 were formed, a groove portion was punched in the other to receive one end portion, but in the first embodiment such a punching portion is formed. Since it is unnecessary, there is an effect that the material can be effectively used.

FIGS. 5 and 6 show a second embodiment of the present invention. In this embodiment, the above-mentioned second moment of area of the section as a condition for equalizing the tightening force of the hose clip HC over the entire circumference. The relational expression of is determined to have the following shape. That is, in this embodiment, the entire hose clip HC is formed with a uniform width, and the width of the flange 4 is gradually changed to both outer peripheral edges of the tightening portion 1.
Is formed symmetrically. Specifically, the height (bending width) of the flange 4 is set to be the highest at the center position (the position corresponding to the point A in FIG. 10) in the lengthwise direction, and from here the direction toward both operation parts 2 is increased. It is formed symmetrically and gradually lowers.

The other structure is similar to that of the first embodiment.
Accordingly, the same function and effect can be exhibited.

7 and 8 show a third embodiment of the present invention. In the third embodiment, the entire hose clip HC is formed with a uniform width and the thickness of the tightening portion 1 is gradually changed. Thus, the second moment of area satisfies the above-mentioned relationship. Other configurations are the first,
The second embodiment is similar to the second embodiment, and thus the same operational effect can be exhibited.

In the present invention, various modifications are possible.
The following modifications are also included in the technical scope of the present invention.

The first to third embodiments merely show an example of the cross-sectional shape of the tightening portion 1, and the point is that the second moment of area satisfies the above-mentioned predetermined conditions. Its shape is not of a nature to be limited.

[Brief description of drawings]

FIG. 1 is a perspective view of a hose clip according to a first embodiment.

FIG. 2 is also a front view

FIG. 3 is a side view of the same.

[FIG. 4] (A) is a cross-sectional view near the center, and (B) is a cross-sectional view at the end side.

FIG. 5 is a perspective view of a hose clip according to a second embodiment.

FIG. 6A is a cross-sectional view near the center, and FIG. 6B is a cross-sectional view at the end side.

FIG. 7 is a perspective view of a hose clip according to a third embodiment.

FIG. 8A is a cross-sectional view near the center, and FIG. 8B is a cross-sectional view at the end side.

FIG. 9 is a perspective view of a conventional hose clip.

FIG. 10A is a conceptual diagram for explaining the equalization of the tightening force, and FIG. 10B is a characteristic diagram showing the relationship between the quadratic coefficient of section and the angle.

[Explanation of symbols]

 1 ... Tightening part 2 ... Operating part 3 ... Rib 4 ... Flange HC ... Hose clip

Claims (1)

[Claims] 1. A hose clip for tightening a hose or the like by winding a long strip-shaped spring plate material in an annular shape and applying an elastic force in a diameter reducing direction, wherein the spring plate material is gradually twisted. The both ends of the spring plate material cross each other in a crossed manner, and the range of tightening the hose or the like in this spring plate material is a cross section at an arbitrary point C while making the contact area with the hose or the like uniform along the entire circumference. The second moment IZC is given by the following formula: IZC = IZMAX · (1 + COSθ) / 2 (IZMAX: maximum moment of inertia of area at the fulcrum of spring plate, θ: angle between fulcrum and arbitrary point C) A hose clip characterized by being used.