JPH1026107A - Fastening band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening band which assures fastening with a large fastening force without reducing the strength of a band provided with a projection for uniformally fastening a tube member. SOLUTION: In a fastening band in which a lever 14 is fixed to an overlapping part 12 of the end part of a band 10 which is bent-molded in a ring shape, and a projection 20 is provided for letting fastening force uniformally act on the tube member while complementing a gap which is produced at the base part of the overlapping part 12 when the overlapping part 12 is pinched to collapse the lever 14 on the band 10 part opposite to the lever 14 for fastening the tube member, the projection depth of the projection 20 is set at approximately 30 to 90% of the combined thickness of the lever 14 and the band 10 at the overlapping part, and the projection width of the projection 20 is set at approximately 30 to 50% of the band width.

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 and fixing a pipe such as a resin boot or a rubber pipe for a constant velocity joint of an automobile.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional tightening band used for tightening and fixing a rubber tube or the like. This fastening band is formed by bending a metal band 10 into a ring shape,
The lever 14 is formed by fixing the lever 14 to the overlapping portion 12 at the end of the band 10. Plastic tube, with tightening band
When tightening a tube such as a rubber tube, the ring portion of the band 10 is passed through the outer periphery of the tube with the lever 14 upright, and the lever 14 is tilted down at the tightening position and tightened, and the stopper 16 fixed to the band 10 is tightened. By bending and locking the lever 14.

[0003] The tightening operation of the tightening band is performed by utilizing the lever action of the lever 14.
It is characterized in that the tube can be tightened and fixed by a simple operation of tilting down and fixing. In this fastening band, since the lever 14 is tilted down and fastened, a band in which the diameter of the ring portion is set according to the outer diameter of the tube is used.

[0004]

The conventional tightening band has been used for a tube body such as a rubber tube which can be elastically deformed to some extent. However, in recent years, it has been used for a resin boot for a constant velocity joint of an automobile. It has also come to be used for tightening hard tubes having small elastic deformation such as plastic tubes. By the way, the tightening band using the lever has a gap in the vicinity of the overlapping portion of the ring portion when the lever 14 is tilted, but no clamping force acts on the pipe in this gap, and the tightening of the pipe is evenly performed. There is a problem that is not done.

As a method for preventing the formation of a gap in the vicinity of the overlapping portion of the ring portion, as shown in FIG. There is one in which a gap 20 is filled in so as to apply a clamping force evenly in the circumferential direction.
FIG. 7 is a view showing a state in which the lever 14 is tilted, in which the protrusion 20 is inserted into the gap and the tube is fastened. FIG. 8 shows the base of the lever 14 and the projection 20 on an enlarged scale. The contact surface 20a that contacts the outer surface of the tube at the projection 20 is formed into a curved surface that matches the curved surface of the tube.

However, as described above, the projections 2
When 0 is provided, the strength of the portion where the projection 20 is provided is reduced, and a problem arises in that the strength required when the tube is fastened with the fastening band is insufficient. That is, when tightening a tube having elasticity such as a conventional rubber tube, there is not much problem.However, when a tube such as a plastic tube which is not easily elastically deformed is tightened, an extremely large tightening force is required. In addition, since the protrusions 20 are provided so that the tightening force acts evenly, the portion where the protrusions 20 are formed may break when tightened with a large tightening force.

The present invention relates to such a tightening band, particularly in the case of a product of a type having a protrusion on the band. By setting the shape of the protrusion to a predetermined shape, it has sufficient strength and a uniform tightening force. It is an object of the present invention to provide a tightening band that can be tightened and fixed.

[0008]

The present invention has the following arrangement to achieve the above object. That is, when the lever is fixed to the overlapping portion of the end portion of the band bent into a ring shape, and the lever is tilted to the band portion opposite to the lever with the overlapping portion interposed therebetween, and the tube is tightened. In a tightening band provided with a projection for complementing a gap generated at the base of the overlapping portion and uniformly applying a tightening force to the tubular body, the projection depth of the projection is set to be equal to the lever of the overlapping portion. The thickness is set to about 30 to 90% of the total thickness of the band together with the band, and the projection width of the projection is set to about 30 to 50% of the band width. Also,
By forming the abutting surface of the projection abutting on the tubular body into a curved surface conforming to the outer diameter of the tubular body, it is possible to prevent air leakage and to perform more preferable fastening and fixing.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. The present invention is a one-touch type tightening band using a lever, and for a product having the above-mentioned protrusion, by setting the protrusion to a predetermined dimension, even a tube which is not easily elastically deformed, such as a plastic tube, can be suitably tightened and fixed. It is characterized by doing so.

The form of the tightening band used in this embodiment is the same as that shown in FIG. FIG. 1 shows a band width A, a projection length B, a projection width C, a projection depth D, and a curvature R of a contact surface of the projection. As shown in FIG. 1, the projection 20 is formed in a tapered surface which is rectangular in a planar shape and gradually becomes deeper toward the overlapping portion side of the band. Since the projections 20 are formed by pressing a band, the band is thinned at the portion where the projections 20 are formed, and the band width is slightly reduced.

FIG. 2 shows the result of measuring the pressure at which air leakage occurs by changing the projection depth D of the projection 20 provided on the band. The measurement was performed for a large diameter (for a tube having a diameter of about 60 to 120 mm) and a small diameter (for a tube having a diameter of about 20 to 70 mm). The band used had a band width of 9 mm, a band thickness of 0.4 mm, and a lever thickness of 1.2 mm. Air leak pressure is 1kg with a general tightening band
f / cm ² or more is an allowable range. When no projection is provided or when the projection depth is too large, air leakage easily occurs, and the measurement results show that the projection depth is 0.7 mm to 1.7 m.
It was confirmed that about m was effective.

In the case of the embodiment, the range of the projection depth is as follows.
Band thickness 0.4mm, lever thickness 1.2mm
The projection depth D is set to about 30 to 90% of the total thickness of the overlapping portion of the band in consideration of the fact that a step of 2.0 mm is formed as a whole in the overlapping portion. Is equivalent to When setting the projection depth,
Generally, it is considered effective to set this range.

FIG. 3 shows the results of measuring the breaking strength of the band while changing the projection width B. The band width is 9 mm and the band thickness is 0.4 mm. As a result of the experiment, the protrusion width C was 4.0 m.
In the case of about m or less, the base material is broken, and the projection width C is 4.5 m.
At about m or more, breakage occurred at the projection. FIG. 4 shows the results of measuring the elongation when no projection is provided, that is, the elongation when a load is applied to the base material and the breaking load at that time,
FIG. 5 shows the results of measuring the elongation of the band when the projection width C was 6 mm and the breaking load at that time. It can be seen that in the case of FIG. 5 in which the projection is provided on the band, the elongation is interrupted and the discontinuous band breaks, whereas the band without the projection shown in FIG. 4 has a sufficient elongation and a large breaking load.

Assuming that the band is provided with a projection and that a breaking load equivalent to that of the base material is an allowable condition, the width C of the projection is preferably about 4.5 mm or less in FIG. If the projection width C is made too narrow, the pressing action by the projections is reduced. Therefore, considering the pressing action (prevention of air leakage) by the projections, the projection width C is about 30 to 50% of the band width. C is preferably set to about 3.5 mm to 4.5 mm.

Regarding the length B of the projection provided on the band,
What is necessary is just to set so that a clamping force may act uniformly on the outer peripheral surface of the tube at the time of tightening, and it may be set according to the diameter of the tube to be used. Usually, the protrusion length B is 4.5 mm to 1
What is necessary is just to select suitably about 0.5 mm.

The tightening band according to the embodiment described above is a tightening band for fixing the simple by tightening the lever 14 by tilting the lever 14. By providing the projection 20 on the band, the tightening force can be uniformly applied to the tube. Accordingly, it is possible to suitably tighten and fix a tube body such as a plastic tube that is not easily elastically deformed. Also, by setting the protrusions provided on the band to the above-described size range, it is possible to obtain a breaking strength substantially equal to that of the base material without the protrusions alone, and to use an extremely large tightening force such as a plastic tube. It can also be suitably used for fastening a tube to be fastened.

[0017]

According to the tightening band according to the present invention,
As described above, it is possible to provide a product having sufficient strength as a tightening band provided with a projection on a band, while applying a uniform tightening force to a tube body to enable reliable tightening without air leakage. As a result, a remarkable effect is achieved such that it can be suitably used for a pipe body such as a plastic pipe which requires a large tightening force.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a projection provided on a band in an enlarged manner.

FIG. 2 is a graph showing a result of measuring an air leakage pressure when a projection depth is changed.

FIG. 3 is a graph showing the results of measuring the breaking load when the projection width was changed.

FIG. 4 is a graph showing the results of measuring the elongation and the breaking load of a band having no projection.

FIG. 5 is a graph showing the results of measuring the elongation and the breaking load of a band provided with protrusions.

FIG. 6 is a perspective view of a tightening band.

FIG. 7 is a side view showing a state in which a lever is tilted.

FIG. 8 is an enlarged explanatory view showing a superposed portion and a projection of a band.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Band 12 Overlapping part 14 Lever 16 Stopper 20 Projection 20a Tapered surface

Claims (2)

[Claims] 1. A lever is fixed to an overlapping portion at an end of a band bent into a ring shape, and the lever is tilted to a band portion opposite to the lever with the overlapping portion interposed therebetween to form a tube. When tightening, in a tightening band provided with a protrusion for complementing the gap generated at the base of the overlapping portion and uniformly applying a tightening force to the tubular body, the protrusion depth of the protrusion is set to A tightening band, wherein the thickness of the lever and the band is set to about 30 to 90% of the total thickness, and the width of the protrusion is set to about 30 to 50% of the band width. 2. The tightening band according to claim 1, wherein a contact surface of the projection that abuts on the tubular body is formed in a curved surface having an outer diameter dimension of the tubular body.