JPH09310792A - Fastening band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening band to effect excellent fastening and cope with aging and creep deformation of a body to be fastened after fastening. SOLUTION: A fastening band 1 has a body 1 for fastening wound around the outer periphery of a body 2 to be fastened for clamping. Cuts 10 in a longitudinal direction by which width is divided into small widths are formed in the body 2 and at least two small width parts 11A and 11B. By effecting longitudinally external bending molding of the small width parts 11A and 11B, and spring parts 8A, 8B, 9A, and 9B worked in a contraction direction are formed. The spring part is displaced in a position by an amount equivalent to at least the length thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tightening band for tightening an object to be tightened, such as a boot at a joint or a hose inserted in a pipe.

[0002]

2. Description of the Related Art Conventionally, as a tightening band for fixing a boot covering a joint portion of a shaft, for example, a boot band 100 having a structure shown in FIG. 8 is known. That is, as shown in FIG. 8, this conventional boots band 100 is provided with an operation piece 102 and an engagement hole 103 at one end of a metal strip 101, and at appropriate intervals on the other end side in the longitudinal direction. A plurality of locking claws 104 cut and raised are provided and the strip 1
On the side of the operation piece 102 of 01, the crimp portion 10 bent outward
5 are provided. As shown in FIG. 9, the boots band 100 includes a boots 106 that covers the joint portion.
Is wound around a predetermined peripheral portion of the engaging hole 103 and one locking claw 104.
, Then swaging the swaged portion 105 in the direction of the arrow in FIG. 9 to wind the belt plate 101 around the boot 106.
Is tightened.

Further, there is also known a boots band 111 shown in FIG. 10 in which a spring portion 113 acting in a contracting direction is provided on a peripheral surface of a strip plate 112, and as shown in FIG. The boot band 111 is assembled to the boot with the spring portion 113 in a tensioned state. Note that FIG. 10 and FIG.
In the figure, 114 is an operation piece, 115 is an engagement hole, and 116 is a locking claw.

[0004]

However, in the conventional caulking type boots band 100 described above, when the boot 106 is aged due to a change with time after tightening, or when the boot 106 is creep-deformed due to heat, the strip 101 is removed. Since the wheel is fixed by the engagement, it cannot be tightened thereafter and there is a problem that the tightening force is reduced. Further, in the boot band 111 of FIG. 10 provided with the spring portion 113, there is a problem that when tightened, a gap S is formed on the lower surface of the spring portion 113, and the tightening property of this portion is not good. As a boots band for solving this gap S, a boots band 121 shown in FIG.
As described above, the strip plate 122 can be double-wound to improve the tightening property of the spring portion 123.
Has to be long, and there is a problem that a lot of materials are required. Also, in the hose band for tightening the connection portion between the hose and the pipe, the above-mentioned boot band has the same problem.

Therefore, an object of the present invention is to solve the above-mentioned inconvenient problems in tightening bands such as a boot band and a hose band. As good as
And the aging of the tightened body after tightening
The purpose of the present invention is to provide a tightening band capable of coping with deformation of the fold.

[0006]

In order to solve the above-mentioned problems, the invention of claim 1 is a tightening band for winding and clamping a tightening main body around a tightened body, the main body having a width thereof. At least two small width portions are formed by providing a notch in the longitudinal direction that divides the inside into a small width, and each of the small width portions is bent outward in the longitudinal direction to form each spring portion that acts in the contracting direction. It is characterized in that it is formed by shifting the position of the spring portion in the longitudinal direction so that the other portion of the narrow width portion excluding the spring portion is located within the width of the main body including the one spring portion.

In order to solve the above-mentioned problems, the invention of claim 2 is characterized in that, in the tightening band according to claim 1, the tightening structure for tightening the main body to a small diameter is a structure in which it is in close contact with the object to be tightened. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the tightening band according to the first aspect of the present invention, the object to be tightened is clamped by the ring-shaped body. In the clamped state, the spring part is in a tensioned state and the tightened body is aged.
When creep deforms, the spring portion acts in the contracting direction to reduce the diameter of the clamp portion. The spring portion is provided in a small width portion where the width portion of the main body is separated so as to be displaced, so that no gap is generated in the spring portion.

In the tightening band according to the second aspect of the present invention, the both ends of the main body are tightened so as to be in close contact with the object to be tightened, and the tightening property of this portion is good.

[0010]

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the structure of a tightening band 1 of the present embodiment (which is also referred to as a boot band in general, since this embodiment is applied to tighten a boot covering a joint portion of a drive shaft and an axle shaft). . This tightening band 1 is formed into a ring-shaped main body 2 whose opposite ends are formed by processing a band plate, and has a shape suitable for clamping a tightened body such as a boot 16.

As shown in FIG. 1, an operation piece 3 bent outward is provided on one end side of the main body 2, and an engaging hole 4 is formed through the inside of the operation piece 3 in the longitudinal direction thereof. A caulking portion 5 that is bent outward in an M-shape is provided further inward of the joint hole 4. The other end of the main body 2 facing the operation piece 3 is formed as a stacking part 6 for covering the lower part of the caulking part 5, and a plurality of locking claws 7 are cut and raised inside the stacking part 6 at predetermined intervals. ing. The locking claw 7 can be engaged with the engagement hole 4. The tip portion 6A of the overlapping portion 6 is formed obliquely as shown in FIG. 4 in order to improve the tightening property when tightened.

At a predetermined position on the inner side in the longitudinal direction of the main body 2 which is not related to the engagement, the first and second members are urged in the direction of contracting the strip plate.
Spring groups 8 and 9 are formed at appropriate intervals. That is, the first spring group 8 is provided with a longitudinal notch 10 that divides the width of the strip near the caulking portion 5 into small widths to form at least two small width portions 11A and 11B.
1A and 11B are provided with spring portions 8A and 8B which are bent outward in a mountain shape or a rectangular shape and are biased in a contracting direction. The second spring group 9 is also provided with a longitudinal notch 10 that divides the width of the strip apart from the first spring group 8 into smaller widths as well, and at least two small width portions 11A, 11B.
Spring portions 9A and 9B are formed on each of the narrow width portions 11A and 11B and are outwardly bent into a mountain shape or a rectangular shape and urged in a contracting direction. The notch 10 for forming the two spring groups 8 and 9 is formed in a slit shape having a small width. (Note that the notch 10 may be a notched state with no width.) In both spring groups 8 and 9, the adjacent spring part 8B is at least the spring part with respect to the spring part 8A of the small width part 11A. They are formed in a staggered manner by sequentially shifting their positions in the longitudinal direction by the length of 8A.

As shown in FIGS. 1, 3 and 5, in this example, spring groups 8 and 9 are provided at two positions of the strip plate at appropriate intervals, and each spring group 8 and 9 has the width of the strip plate. A cut 10 is made in the longitudinal direction at the center of the width so as to have an equal small width, and the left and right small width portions 11A and 11B are divided into two small width portions 11A and 11B.
In B, the spring portions 8A and 8B that protrude outward in an arc shape are formed. Each spring portion 8 of the left and right narrow width portions 11A and 11B
A and 8B are staggered by shifting one side by the length thereof in the longitudinal direction so that they are not in the same position.

It should be noted that the left and right pairs of spring portions 8A, 8B, 9A, 9B in each spring group 8, 9 preferably have a staggered relationship so as not to be too far apart in order to equalize the spring action. The band plate of the tightening band is made of a metal plate and is hardened after each member is molded to give the band itself proper spring rigidity. The quenching process may be performed mainly by the first and second spring groups.

Then, the drive shaft 1 shown in FIG.
The case where the tightening band 1 of FIG. 1 is tightened on the boot 16 which covers the joint portion 15 of the axle shaft 14 and the shaft 3 will be described. As in the conventional case, for example, when the joint portion 15 is assembled, the tightening band 1 is inserted together with the boot 16 on the drive shaft 13 side, and then the large diameter side of the boot 16 is fitted to the cup portion 14A of the axle shaft 14. It is externally mounted, and the tightening band 1 is placed on the large diameter portion of the boot 16 and tightened.

That is, in FIG. 1, the overlapping portion 6 of the main body 2
The operation piece 3 is placed on the upper side, and the operation piece 3 is pulled toward the locking claw 7 side with a tool to insert the one locking claw 7 at a position where the ring of the tightening band 1 has a small diameter into the engaging hole 4. By caulking the caulking portion 5, the tightening is completed as shown in FIGS. 6 and 7.

In the tightening band 1 after crimping, the spring portions 8A, 8B, 9A, 9 of the first and second spring groups 8, 9 are formed.
B is in a state of acting in the contracting direction, and the outer periphery of the boot 16 is clamped and held by the small-diameter ring-shaped portion of the tightening band 1. Since the locking claw 7 is inserted into the engagement hole 4 of the ring-shaped portion, the ring-shaped portion which is assembled is retained without coming off. The lower portion of the caulking portion 5 is covered with the overlapping portion 6, and each spring portion 8A, 8B, 9A, 9B has a narrow portion 11 next to it.
Since A and 11B cover the boots 16 side, boots 1
The outer circumference of the connecting portion of 6 is evenly tightened.

When heat is applied to the connecting portion 16A of the boot 16 or the material of the boot 16 is aged in this tightened state, as shown by the phantom line K in FIG. Since the thickness is reduced, the tightening force of the tightening band 1 in the engaged state is reduced. Since both ends of the tightening band 1 are engaged with the engaging holes 4 and the locking claws 7, further tightening cannot be performed after tightening, but each spring portion 8
A, 8B, 9A, and 9B are in a tensioned state at the time of the first tightening operation and have a spring action that returns to the original shape. Therefore, when the thickness of the boot 16 after the tightening is reduced, the spring portion is The ring-shaped portion is automatically reduced in diameter by the spring action of 8A, 8B, 9A, and 9B in the contracting direction (see the arrow direction in FIG. 7). Therefore, the tightening force of the connecting portion 16A can be maintained in response to the decrease in the thickness of the boot 16 after tightening. Since the spring portions 8A, 8B, 9A and 9B have been hardened and have a spring action, the boot 16
It positively acts in the direction of shrinkage with respect to the reduction of the wall thickness, and the tightening of the connecting portion 16A of the boot 16 can be favorably maintained for a long period of time.

In the tightening band 1 of this example, the width of the strip is divided into two small width portions 11A and 11B on the left and right, which are formed by cutting the width of the strip into equal small widths.
A and 9B are provided alternately to form spring groups 8 and 9, and this spring group is provided at two places. However, the number of strips divided into small widths and the number of spring groups are not limited to this example, and small widths are provided. 2 or more, and the number of spring groups is 1 or more, which can be determined as necessary. The tightening of the band plate of the tightening band 1 in this example is performed by crimping the caulking portion 5, but an appropriate structure that does not create a gap between the band plate and the object to be fastened should be adopted. You can

[0020]

According to the first aspect of the present invention, the tightening band clamps the object to be tightened by the main body provided with the spring portion. Therefore, the tightening of the object to be tightened can be performed as well as the conventional one. Since the tightening band according to claim 1 is clamped by the main body provided with the spring portion that acts in the contraction direction, when the diameter of the tightened body is reduced after the tightening such as aging or creep deformation. By the action of the portion, the tightening can be performed according to the change in the diameter of the tightened body. In particular, this tightening band is provided with a longitudinal cut in the width of the body to form at least two small width portions, and a spring portion acting on the small width portion in the contracting direction is formed by at least the length of the spring portion. Since it is formed by shifting the position in the longitudinal direction, the tightening body is tightened in the other narrow width part in the gap generated in the small width spring part, so that the tightening body is tightened in the spring part like the conventional tightening band shown in FIG. The tightening property of the object to be tightened can be made good without any untightened part. Further, in the tightening band according to the first aspect of the present invention, it is not necessary to double the band plate, so that it is not necessary to lengthen the main body. Since the tightening band according to claim 2 has a structure in which both ends of the main body are tightly attached to the object to be tightened, in addition to the effect of the tightening band according to claim 1, the tightening property of the entire object to be tightened can be excellent.

[Brief description of drawings]

FIG. 1 is a perspective view of a tightening band according to an embodiment.

FIG. 2 is a tightening state diagram of a tightening band of the embodiment.

FIG. 3 is a shape diagram of a spring group, (a) shows the front side,
(B) shows the back side.

FIG. 4 is an end view of the overlapping portion.

FIG. 5A is a development view in which a part of the tightening band is omitted. (B) is a side view in which a part of the tightening band in a deployed state is omitted.

FIG. 6 is a view in which a tightening band is applied to a boot of a joint portion.

FIG. 7 is an explanatory view of the action of the tightening band.

FIG. 8 is a perspective view of a conventional tightening band.

9 is a view showing a tightening state of the tightening band shown in FIG.

FIG. 10 is a shape view of another conventional tightening band.

11 is a view showing a tightening state of the tightening band shown in FIG.

FIG. 12 is a tightening state diagram of another conventional tightening band.

[Explanation of symbols]

 1 Tightening band 2 Main body 4 Engagement hole 5 Caulking part 6 Lapping part 7 Locking hole 8, 9 Spring group 8A, 8B, 9A, 9B Spring part 10 Notch 11A, 11B Small width part 16 Boots

Claims (2)

[Claims] 1. A tightening band for winding and clamping a tightening main body around an object to be tightened, wherein the main body is provided with a longitudinal notch dividing the width thereof into small widths to form at least two small width portions. In addition, each part of each small width part is bent outward in the longitudinal direction to provide each spring part that acts in the contraction direction, and the spring of another small width part is included within the width of the main body including one spring part. A tightening band formed by shifting the position of the spring part in the longitudinal direction so that the part excluding the part is located. 2. The tightening band according to claim 1, wherein the tightening structure for tightening the main body to a small diameter has a structure in which the main body is in close contact with the object to be tightened.