JPH0663524B2 - Tightening band - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of a tightening band used for tightening and fixing a tubular member made of an elastic body or the like to a fixed object having a circumferential surface. is there.

(Prior Art) For tightening and fixing a cylindrical boot, cover and the like to a fixed object having a substantially circumferential surface such as a transmission shaft of a vehicle, a tightening band made of steel strip or the like is used. . This type of tightening band encloses the outer peripheral surface of the cover cylinder so that it can be tightened.At the beginning, both ends are not joined and there is a loop shape when tightening. It is necessary to provide each end with a tool engaging portion for engaging the tightening tool and a connecting portion that is engaged with each other at the end of tightening. An example of this type of tightening band is Japanese Utility Model Application No. 59-105288.

When referring to the connecting part here, it is desirable that it is easy to form and has high strength, but in the conventional connecting part, a substantially U-shaped cut is made at either one of both ends of the band.
In many cases, the connecting projection formed by bending and bending the portion surrounded by the notch is connected to the edge of the connecting hole formed at the other end. With this configuration, the connecting protrusions project obliquely from the band body and the amount of protrusion is considerably large.By connecting the edge of the connecting hole to the connecting protrusions, the two ends are brought into close contact with each other and separated from each other. The feature is that is prevented.

(Problems to be solved by the invention) However, on the other hand, since the connecting projection merely bends and raises the tongue, its strength is not sufficient, and it deforms after being engaged with the edge of the connecting hole (upright). May be further raised in the direction of contact), and the amount of protrusion from the connecting hole in the radial direction is large, so there is a risk of contact and interference with the operator's hand and other peripheral members.

On the other hand, the tool engaging portion is often formed on the end portion of the band in the same manner as the connecting protrusion, and the tool is engaged with the free end of the bent tongue portion. The tool engaging portion formed in this manner has a feature that it is easy to engage the tool due to the large amount of protrusion from the band main body, but the strength is not so great for the above-mentioned reason, so the tool engaging portion When they are combined and tightened, there is a fear that they may be deformed or damaged due to the frictional force acting between the band and the boot or the like (this becomes considerably large depending on the position of the tool engaging portion).

The present invention is a tightening band having a pair of open ends for solving the above-mentioned drawbacks in the prior art, that is, for surrounding and tightening an outer peripheral surface of a tubular object from an elastic body or the like. , First on each open end
A locking band or a second locking surface is formed, both locking surfaces are locked to each other when tightening, and the purpose of the present invention is to provide a tightening band in which each locking portion can be easily formed. Is.

In order to achieve the above object, in the present invention, the first locking surface is a first hole 28 formed in the inner end 20.
The inner surface of the inner end portion of the first protrusion 24 that is formed on the edge near the tip of the first projection 24 and that is radially outward and is formed obliquely with respect to the outer surface of the inner end portion away from the tip of the inner end portion. And the inner surface of the first protrusion connected to the. On the other hand, the second locking surface is formed on the edge near the tip of the second hole 18 formed in the outer end 12 so as to be radially inward and away from the tip of the outer end. The outer surface of the second projection is continuous with the outer surface of the outer end of the second projection 15 that is formed obliquely to the inner surface of the outer end, and the outer surface of the second projection is the outer surface of the first projection. It forms an angle corresponding to the inner surface of the protrusion.

Then, when the band is tightened, the inner end portion and the outer end portion are deformed so that the overlapping amount is increased, and the first locking surface and the second locking surface are locked.

(Example) Hereinafter, the Example of this invention is described based on drawing. First to
As shown in FIG. 3, a band body 10 made of a steel strip has a pair of open ends 12 and 20, and one end 12 has a rectangular hole 14 of a medium length in order from the end, A short hole 16, a protrusion 15 formed by bending the tongue inward and bending it, and a long hole 18 are formed. The other end 20 has a tapered shape,
Protrusions 22 and 24 formed by bending and bending outwardly the tongue in order from the tip, and rectangular holes 26 and
28 (see FIG. 4), a long and narrow rectangular hole 30, a raised portion 32 that is raised like a tunnel, and a rectangular hole 34 adjacent to the raised portion 32 are formed. End 20 with elongated hole 30
At the portion of, a lifting prevention member 40 including a bottom portion 36 and a pair of bent portions 38 is integrally fixed to the back surface of the end portion 20 by spot welding, and the bunt body 10 and the lifting prevention member 40 are joined together. A tightening band 50 is constructed.

Next, with the tightening band 50 of the present embodiment, the transmission shaft of the vehicle is
A method of tightening and fixing the rubber boot 54 on the 52 will be described.

Before use, the tightening band 50 is bent so that the side from which both the projections 22 and 24 project is outward, but the both ends 12 and 20 are not connected to each other and are open. Therefore, by wrapping the rubber boot 54 from both sides with the both ends 12 and 20 and pressing an appropriate portion of the tightening band 50 toward the rubber boot 54 by hand, the diameter is reduced and the band body is reduced.
The 10 contacts the rubber boot 54 and the ends 12 and 20 are overlapped so that the end 12 is outside the end 20.

At this time, as shown in FIG.
Between the bent portions 38 (see FIG. 5) bent slightly inward, and the outer surface of the projection 15 formed inwardly on the end portion 12 and the end portion. Temporary fixing is carried out by engaging the inner surface of the projection 22 formed outwardly on the 20 with each other. In this state, the protrusion 15 is fitted in the hole 26 and the protrusion 22 is fitted in the hole 18, but neither of the protrusions 15 and 22 protrudes inward or outward from the holes 26 and 18. Also, at the same time as the protrusion 22 is fitted into the hole 18, the protrusion 24
Is fitted in the hole 16, and the projections 22 and 24 contact both side edges of the holes 16 and 18, thereby preventing the both ends 12 and 20 from being relatively displaced in the width direction thereof.

In the temporarily fixed state, as is apparent from FIG. 2, the hole 14 of the end portion 12 and the hole 30 of the end portion 20 are in phase with each other in a part in the circumferential direction. Therefore, as shown by the chain double-dashed line in the figure, the one engaging portion 60 of the tightening tool tip is inserted into the corresponding hole portion to engage with the end edge 13 of the hole 14, and the other engaging portion 62. Is inserted into the hole 34, the inner surface is engaged with the edge 33 of the raised portion 32 having a tunnel shape, and a force is applied in a direction in which the length of the overlapping portion of the both end portions 12 and 20 becomes longer. Then, the end portion 12 in FIG. 2 is displaced leftward and the end portion 20 is displaced rightward, and the diameter thereof is further gradually reduced so that the rubber boot 54 is pressed onto the transmission shaft 52 by the tightening band 10. As the tool is tightened, one of the engaging portions 60 passes through the space between the bent portions 38 of the rising prevention member 40 (see FIG. 5), and the tip of the end portion 12 reaches the front of the engaging portion 32. become. During this time, the projection 15 gets over the projection 24 and fits into the hole 28, and its outer surface engages with the inner surface of the projection 24, and the substantial tightening is completed. Since the protrusions 22 are still fitted in the holes 18, the protrusions 22 guide each other to prevent the band ends 12 and 20 from being displaced in the width direction during tightening. Then engage the tool
Remove 60 and 62 and, as shown in FIG.
The bent portion 38 is bent inward and engaged with the side edge of the hole 16 to complete the final tightening, and the tightening band 50 securely fixes the rubber boot 54 on the transmission shaft 52. However, the hole 30 serves as an escape hole for the tool engaging portion 62, but since the end 12 is located outside and allows a slight upward movement in the radial direction, the hole 30 is not always necessary. Not necessarily.

As is clear from the above description, the hole 14 on the end 12 side serves as an insertion hole for the tool engaging portion 60, and the edge 13 of the hole 14 has the tool engaging portion 60.
The hole 16 serves as an escape hole for the protrusion 24 during temporary fixing, and the hole 18 serves as an escape hole for the protrusion 22 during temporary fixing.
When fully tightened, it serves as an escape hole for protrusions 22 and 24, and
The groove 15 serves as a guide groove and a groove for preventing misalignment in the width direction, and the projection 15 serves as a temporary fixing and final tightening projection. On the other hand, the hole 26 on the end 20 side serves as an escape hole for the protrusion 15 during temporary fastening, the hole 28 serves as a throw hole for the protrusion 15 during final tightening, the hole 30 serves as an escape hole for the engaging portion 60 of the tool, and the hole 34 is It serves as an insertion hole for the tool engagement portion 62, the projection 22 serves as a temporary fixing projection, the projection 24 serves as a final fastening projection, and the edge 33 of the raised portion 32 serves as the engagement portion of the tool engagement portion 62. ing.

The features of this embodiment are as follows. First tightening band
The band 50 includes two members, the band body 10 and the rising prevention member 40.The band body 10 is easily and inexpensively manufactured by pressing one band steel, so that the manufacturing cost of the tightening band 50 is reduced. To be done. In addition, by bending around the rubber boot 54 of the tightening band 50 by hand and temporarily fixing it, and then performing final tightening with a manual or automatic tightening tool,
The protrusion 15 is actively moving inward due to the tension of the band main body 10, so that the protrusion 15 is pushed at the moment when it gets over the protrusion 24.
And the projection 24 are automatically engaged. Therefore, even if only Yui is used, each tightening work can be performed stably and easily, and the tightening becomes reliable. In addition, the contact portions of the engaging surfaces of the protrusions 15 and 24 that support the tension of the band at the time of final tightening are located close to the inner surface of the outer end portion and the outer surface (overlapping contact surface) of the inner end portion, and the protrusions 15 and 24 respectively. Since this tension is supported by the shearing resistance of the root of the bent portion, the projection is not deformed and further bent, and a reliable engagement portion is obtained.

Further, the portions where the engagements 60 and 62 of the tools are engaged at the time of final tightening, that is, the edge 13 of the hole 14 and the edge 33 of the raised portion 32 whose inner surface is a tunnel are each a wide area in the entire width direction. Engagement part 60
Since they are engaged with No. 62 and No. 62, they are strong and are not deformed by the tightening force applied by the tool. Furthermore, in the fully tightened state, as is apparent from FIG.
Neither 15 nor 24 protrude from the inner peripheral surface and the outer peripheral surface of the band body 10 (the protrusion 22 also does not protrude from the outer peripheral surface), which reduces the swing circle on the outer periphery and interferes with peripheral members. The tightening band 50 prevents the rubber boot 54 from being damaged. This keeps the height of the protrusions 22, 24 and 15 as low as possible, these protrusions are used only to connect the ends 12 and 20, and
The lifting of 12 is possible because the prevention member 40 regulates it.

Further, since the first and second end portions 12 and 20 are pulled close to each other in the tangential direction of the rubber boot 54 at the time of final tightening, the friction between the rubber boot 54 and the tightening band 50 is small, and the rubber boot 54 is Without damage
Easy to tighten.

In addition to the above-mentioned ones as the floating prevention member,
As shown in FIG. 11, a lifting prevention member 88 composed of a bottom portion 80 and a pair of bent portions 84 in which an intermediate step portion 82 is formed is used, and in the temporarily fixed state, the bottom portion 80 and the step portion 82 are At both ends 12 and 20
When the final tightening is completed, the tool engaging portion 60 is passed between the upright bent portions 84, and after the final tightening, the bent portion 84 is bent inward as shown in FIG. It may be engaged with the edge.

Next, another embodiment of the present invention will be described with reference to FIGS. A projecting portion 74, which is narrower than the end portion 70 and has a step 72 directed inwardly between the end portion 70 and the end portion 70, is provided at the tip of the end portion 70. Long holes in the 76,
A short hole 78, an inward projection 80, a medium hole 82 and an inward projection 84 are formed. On the other hand, the other end 90 is provided with three outwardly projecting projections 92, 94 and 96 and rectangular holes 98, 100 and 102 adjacent to each projection, and a short tunnel-shaped cavity on the inner surface. A ridge portion 104, an elongated rectangular hole 106, and a ridge portion 108 having a long tunnel-shaped cavity on the inner surface are sequentially formed from the tip. In addition, the end portion 90 has substantially the same width as that of the end portion 90, and is formed from the protrusion 92 to the raised portion.
The back metal 110, which is longer than the circumferential distance to reach 108, is fixed to the end 90 by spot welding at a predetermined portion,
98, 100, 102 and 106 are covered from the inner peripheral surface side.

In the tightening band 120 according to the present embodiment, the ends 70 and 90 are superposed in the same manner as described above, and the projections 80 and 84 are engaged with the projections 94 and 92, respectively, as shown in FIG. To do. At this time, the projections 80 and 84 are respectively holes 100 as escape holes.
And 98, and the projections 94 and 92 are fitted into holes 78 and 82, respectively, which serve as clearance holes. Further, the protrusion 96 is fitted into the hole 76 and comes into contact with the side edge of the hole 76 to prevent relative displacement of the both end portions 70 and 90 in the width direction. Further, the protruding portion 74 is a raised portion 108.
It is slightly inserted into the inlet part of the hole, thereby preventing the end portion 70 from rising, and the holes 76 and 106 are partially in phase.

Next, the hole 76 of one of the engaging portions 112 and 114 of the tool 114
The other edge 112 is engaged with the edge edge 115 of the raised portion 104, and a force is applied to separate the engagement portions 112 and 114 from each other. Then, in FIG. 9, the end portion 70 is displaced to the left and the end portion 90 is displaced to the right, and the protrusions 80 and 84 are fitted into the rear holes 102 and 100 which have passed over the protrusions 96 and 94, respectively. It engages with 94, and by this, it becomes a final tightening state. At this time, the protrusion
92 is fitted in the hole 82, and the protrusion 74 is deeply inserted in the tunnel-shaped raised portion 108. The back metal 110
The rubber boot 54 is elastically deformed during final tightening
It is fixed in order to prevent it from entering into 98, 100, 102 or 106 and blocking these holes to prevent the projections 80 and 84 from being fitted or the protrusion 74 from being inserted.

This embodiment is different from the above embodiment in that the back metal 110 is
In addition to the provision of, the rise prevention member 40 is eliminated and instead the protrusion 74 and the raised portion 108 are formed,
Assuming that a fastening tool of the type in which the engaging portions 112 and 114 are expanded is used, the end edges 77 and 115 have a corresponding structure, and the two protrusions 80 on the end portion 70 side.
And 84, and three protrusions 9 on the end 90 side.
2, 94 and 96 are formed.

Also in this embodiment, similarly to the above embodiment, the protrusions 80 and 96 and the protrusions 84 and 94 which are engaged with each other in the final tightening state have high strength and do not project from the inner and outer peripheral surfaces of the band body 71. Further, the edges 115 and 77 with which the engaging portions 112 and 114 of the tools are engaged have a large width and a large area, so that the strength is large and they do not deform during final tightening.

Needless to say, the present invention is not construed as being limited to the above-described embodiments, and can be appropriately modified within a range not impairing the gist thereof. For example, the specific shapes and sizes of the first and second protrusions and the first and second tool engaging portions can be arbitrarily improved. The application of the tightening band is not limited to tightening the rubber boot on the transmission shaft.

(Effects of the Invention) As described above, according to the present invention, the tightening body tightens the tightening body on the tightened body, and the first or the first shape is formed on both open ends of the tightening band. It is fixed in a tightened state by locking the locking surface of 2. At that time, the first locking surface and the second locking surface abut against each other in the vicinity of the mating surfaces of the respective open ends, so that the locking surface is deformed by the tangential force applied to each locking surface, Almost never damaged.

[Brief description of drawings]

1 to 7 show a first embodiment of the present invention, FIG. 1 is a perspective view showing both ends of a tightening band before tightening, and FIG. 2 is a sectional view showing a temporarily fixed state (partly). (Omitted), FIG. 3 is a cross-sectional view (partially omitted) showing the final tightened state, FIG. 4 is a view in the IV direction in FIG. 1, and FIG. 5 is V in FIG.
-V sectional view, FIG. 6 is a sectional view taken along line VI-VI in FIG. 3, and FIG. 7 is an enlarged view of a VII portion in FIG. 8 to 10 show a second embodiment of the present invention, FIG. 8 is a perspective view of both ends before tightening, and FIGS. 9 and 10 show a temporarily fixed state and a final tightened state, respectively. It is a sectional view (all are partially omitted). FIG. 11 and FIG. 12 show a modified example of the lifting prevention member, which correspond to FIG. 5 and FIG. 6, respectively. [Description of symbols of main parts] 10 ... band body, 12 ... first end portion, 13 ... first tool engaging portion, 15 ... first protrusion, 20 ... second end portion , 24 ... second protrusion, 33 ... second tool engaging portion, 40 ... floating prevention means, 60, 62 ... tool engaging portion,

Claims (3)

[Claims] 1. An inner end portion that surrounds a tubular tightening body that is attached to a tightened body, and an inner end portion that becomes an inner side and an outer end that becomes an outer side when they are stacked to tighten the tightened body body to the tightened body body. A fastening band having a portion, wherein the inner end portion has a first locking surface, and the outer end portion has a second locking surface that is locked with the first locking surface at the time of tightening. In each of the tightening bands formed, the first locking surface is formed at an edge of the first hole formed in the inner end portion near the tip, and is radially outward and the inner end portion is formed. The inner surface of the first protrusion that is continuous with the inner surface of the inner end of the first protrusion that is formed obliquely with respect to the outer surface of the inner end so as to move away from the tip of the second lock. The surface is formed on the edge near the tip of the second hole formed at the outer end, and faces inward in the radial direction. And an outer surface of the second projection that is continuous with an outer surface of the outer end of a second projection that is formed obliquely with respect to the inner surface of the outer end so as to move away from the tip of the outer end, The outer surface of the second protrusion forms an angle corresponding to the inner surface of the first protrusion, and when tightened, the inner end portion and the outer end portion are deformed so that the overlapping amount increases, A tightening band that locks the first locking surface and the second locking surface. 2. The first projection and the second projection are each formed with a height and an inclination that do not project from the second hole or the first hole. The tightening band shown. 3. An inner tool engaging portion is formed at the inner end portion, an outer tool engaging portion is formed at the outer end portion, and the first and second tool engaging portions are formed at the time of tightening. The tightening band according to claim 1 or 2, wherein the engaging portions of the tool are engaged with each other to apply a tangential force to the inner end portion and the outer end portion.