JPH0414700Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an oval hose band used for tightening and fixing the end of a hose fitted into an oval mouthpiece of various devices.

Problems to be solved by conventional techniques and ideas This type of hose band is made by bending a strip material with a plurality of engagement grooves interconnected in the length direction at one end, so that one end overlaps the outer surface of the other end. A rotating shaft provided with a worm that meshes with the meshing groove is rotatably supported on a support body that is fixed to the outer surface of the other end with one end straddling the outer surface of the other end to form an oval tightening part. An oval hose band is used in which one end of the band material is moved relative to the other end by rotation of the shaft, and the tightening part is expanded and contracted, but the conventional oval hose band is
It has a structure in which the support body supporting the rotating shaft is positioned on the short axis or long axis of the tightening part, and when it is fitted onto the end of the hose fitted into the oval base and tightened, The clamping force mainly acts in the long axis direction of the outer peripheral surface of the hose, and the clamping force in the short axis direction is insufficient, which sometimes causes liquid leakage.

Means for Solving the Problems The oval hose band of the present invention aims to solve the above problems by changing the position of the support that supports the rotating shaft. The structure is such that the long axis of the attached part and the central angle intersect in a range of 25 to 45 degrees.

Functions and Effects The present invention has the above-mentioned configuration, and is fitted onto the end of a hose fitted into an oblong mouthpiece, and the diameter of the tightening portion is reduced by rotating the rotating shaft in one direction, thereby tightening the outer peripheral surface of the hose. When tightened, the tightening force that acts on the outer circumferential surface of the hose is compared to when a structure in which the support body is located on the short axis or long axis of the tightening part is tightened with the same tightening torque. It has been confirmed through experiments that the clamping force in the short axis direction of the outer circumferential surface of the hose becomes significantly larger, and that the clamping force in the long axis direction is also about the same or slightly larger. A substantially uniform and large tightening force can be applied across the entire body, which has the effect of reliably achieving the function of preventing fluid leakage.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

The hose band of this embodiment is made by bending a band material 1 whose both widthwise edges are bent inward to form biting portions 2, 2, so that one end portion 1a of the band material 1 is bent inward to form bite portions 2, 2. An elliptical tightening part 3 is formed by overlapping the strip material 1 with one end 1a and the other end 1b.
are formed so as to overlap at a position between the long axis and the short axis of the elliptical tightening part 3, and a plurality of engaging grooves 5 are formed at a constant pitch along the length direction in one end 1a of the strip 1. At the same time, a box-shaped support 6 is attached to the outer surface of the other end 1b of the strip 1 on the line A rotating shaft 7 to which a worm 8 is fixed is rotatably supported by the support 6, and the worm 8 is engaged with the above-mentioned engagement groove 5. This oval hose band is externally fitted onto the end of an oval hose b fitted into an oval mouthpiece a, and by rotation of the rotating shaft 7 in one direction, one end 1a of the band material 1 is attached to the support 6.
By moving in the direction of protruding from the support body 6 through the openings 9, 9 on both end faces of the hose b and reducing the diameter of the tightening part 3, the outer circumferential surface of the hose b is tightened, and the outer peripheral surface of the hose b is tightened. Due to the rotation of , one end 1a of the strip 1
By moving in the direction of retracting into the support body 6 and expanding the diameter of the tightening portion 3, the tightening is released.

Next, as in the above embodiment, the support body 6 is attached to the biting part 2 of the oval hose band located on the line The measurement results of the clamping force on the outer circumferential surface of the hose b with the formed biting part 2 and the one without the biting part 2 are based on the structure in which the support body 6 is positioned on the short axis and the long axis of the clamping part 3. A comparison is shown with the measurement results of the tightening force of

To measure this tightening force, first, attach an oval hose band to an oval cap a with an outer diameter of 113 mm in the major axis direction and 73 mm in the short axis direction, and a wall thickness of 5.5 mm.
It is formed into a size suitable for fitting and tightening hose b of mm, and on the other hand, make 8 slits on the rim of cap a so as to divide the outer circumference into 8 equal parts, and A total of 8 test pieces were formed on both sides of the axis, on both sides of the long axis, and between them, and a strain gauge for measuring the amount of strain in the test piece was attached to the base of each of these test pieces. Hose b at the tip of the test piece
Attach the oval hose band to this hose b, and tighten the oval hose band to a torque of 1.
The amount of strain of each test piece was measured when tightened to 0, 20, 30, 40, and 50 kg cm, and
As shown in the figure, by plotting the amount of strain measured toward the center of the ellipse with the amount of strain on the circumference of the ellipse as 0, and expressing it in a graph connecting each tightening torque with a line, each ellipse can be The distribution of the tightening force of the hose band is now shown.

The distribution state of the tightening force of each oval hose band by the above measurement method is as follows: First, the support body 6 is positioned on the line Regarding the oval hose band, the one without the cut-in part 2 is as shown in Figure 3a, and the one with the cut-in part 2 is shown in Figure 3b.
The oval hose band with the fastening part 3 located on the short axis is shown in FIG. 4a without a biting part and in the same figure b with a biting part, For an oval hose band with the elliptical hose band located on the long axis of the tightening part 3, the one without the biting part is shown in Figure 5a, and the one with the biting part is shown in Figure 5b. A comparative study shows that both the one without a biting part and the one with a biting part have the support 6 aligned with the long axis 3 of the fastening part 3.
The oval hose band located on the line
or the support 6
Compared to the one where the is located on the long axis of the tightening part 3,
The clamping force in the short axis direction increases, and the clamping force in the long axis direction is about the same or slightly larger,
It was confirmed that the tightening force was equalized over the entire circumference, and it was also confirmed that by forming the biting portion 2, the tightening force could be increased with the same tightening torque. Ta.

Note that in the above embodiment, the support body 6 is
The support body 6 is positioned on a line where the long axis 3a of the fastening part 3 intersects with the center angle α at 35°, but the support 6 It has been confirmed through similar experiments that positioning the screws is effective in equalizing the tightening force.

Further, the present invention is not limited to the geometrical oval shape as in the above embodiment, but can be similarly applied to an oval hose band that is a flattened circle.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a partially enlarged perspective view thereof, and Fig. 3 shows a support body positioned on a line where the long axis of the tightening part and the center angle intersect at 35 degrees. Figure 4 shows the same graph when the support is positioned on the short axis of the tightening part.
FIG. 5 is the same graph when the support body is positioned on the long axis of the tightening part. 1...Strip material, 1a...One end (of band material 1), 1
b...Other end (of band material 1), 2...Encroachment part, 3...
...Tightening part, 3a... Long axis of (tightening part 3), 5...
Engagement groove, 6... Support, 7... Rotating shaft, 8... Worm, α... Center angle, X... Line, b... Hose.

Claims (1)

[Claims for Utility Model Registration] 1. A belt material having a plurality of engaging grooves connected in the length direction at one end is bent and the one end is overlapped with the outer surface of the other end to form an oval shape. forming a section;
A rotating shaft provided with a worm that engages with the engaging groove is rotatably supported on a support fixed to the outer surface side of the other end across the one end, and the one end of the band material is rotated by rotation of the rotating shaft. In the oval hose band in which the tightening portion is expanded/contracted by being moved relative to the other end, the support body has a center angle of 25 to 45° with respect to the long axis of the tightening portion.
An oval hose band characterized by being located on a line that intersects within the range of. 2. An oblong hose band according to claim 1, which is a registered utility model, characterized in that a biting portion that bites into the outer peripheral surface of the hose is formed by bending both side edges of the band material inwardly. .