JP4596666B2 - Hose clamp - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hose clamp for tightening connection portions of pipes such as a hose and a tube.
[0002]
[Prior art]
Conventionally used hose clamps are formed from a belt-shaped leaf spring material 100 in an unfolded state as shown in FIG. 7 by turning the whole into a ring shape as shown in FIG. First and second knobs 102 and 103 for expanding the diameter of the entire hose clamp 101 are provided at both ends so as to stand up radially outward.
[0003]
A punching hole 104 is opened on one end side in the unfolded state, and the first picking piece 102 is formed by bending from the middle of the punching hole 104. In addition, a gradual change portion 105 whose width dimension changes is formed on the other end side, and the gradual change portion 105 crosses on the circumference through the hole 104 when it is turned into an annular shape from the developed state. Thus, the second knob 103 is bent and raised so as to face the first knob 102.
[0004]
Further, a pair of triangular windows 106 are opened in a portion between the gradual change portion 105 and the hole 104 so that the vertices of each other face each other. The triangular window 106 has a known structure, and can make the tightening force relatively uniform along the circumferential direction.
[0005]
[Problems to be solved by the invention]
By the way, it is easier to insert the hose clamp 101 into the hose or the like when the hose clamp 101 is carried into the site with the inner diameter expanded beforehand. For this reason, conventionally, both the knobs 102 and 103 are brought close to each other so that the entire hose clamp 101 is expanded, and then a holder (not shown) is attached to both the knobs 102 and 103 to hold the knobs close to each other. Thus, the entire hose clamp has been held in an expanded state.
[0006]
However, when the conventional hose clamp is set in such an expanded state, the following points to be solved remain. That is, a portion between the triangular window 106 and the hole 104 (portion A shown in FIG. 7) and a portion from the other triangular window 106 to the gradually changing portion 105 (portion B shown in the drawing). Then, the entire width dimension (the width dimension of the portion with the meat) changes abruptly. For this reason, when the hose clamp is deformed into the expanded diameter state, stress concentrates on the above-described A and B portions. Then, there is a possibility that the roundness may not be maintained when such a portion is “biased” and reduced in diameter and tightened.
[0007]
The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a hose clamp capable of avoiding stress concentration when expanded in diameter. .
[0008]
As a means for achieving the above object, the invention of claim 1 is directed to a clamp main body formed by turning a belt-shaped leaf spring material in an unfolded state into an annular shape, and a length direction of the clamp main body. A hose clamp including first and second knob operation pieces that are erected radially outward from both ends, and in the deployed state , with a Y axis that is a central axis in the length direction as a boundary The one side region is a first region for forming the first picking operation piece, the other one side region is a second region for forming the second picking operation piece, and the first region Is symmetric with respect to the X axis, which is the central axis in the width direction , and an opening is formed to increase the opening width almost continuously from the periphery of the Y axis toward the tip, while the second region is symmetrical with respect to the X axis. From the Y axis to the opening. The length range from the distance A equal distance position spaced from the Y axis up to the starting end of the Y-axis closer to the distal end portion is formed so as to continuously narrow that, the clamp body portion When turning in an annular shape, the inside of the opening is crossed while forming the same peripheral surface , and the rate of change in the width dimension of the second region sandwiches the opening in the first region. It is set to be approximately equal to the rate of change of the combined width dimension of both side portions, and is a predetermined distance B from the Y axis at the start end position near the Y axis and the substantially central portion in the length direction of the opening edge of the opening. A length range between the position separated from the Y axis by a predetermined inclination angle (θ1) with respect to the X axis and the opening from the position separated by the predetermined distance B from the Y axis. The length range to the end of the X axis is On the other hand, of the side edges of the narrow portion of the second region that is formed with an inclination angle (θ2) slightly smaller than the inclination angle (θ1), the distance A from the Y axis. A length range between a position separated from the Y axis by a distance equal to the predetermined distance is formed so as to form an inclination angle equal to the θ1 with respect to the X axis. The length range from the position away from the axis by a distance B to the end of the narrow part is formed with an inclination angle equal to the θ2 with respect to the X axis. It is a feature.
[0009]
According to a second aspect of the present invention, in the first aspect of the present invention, in the corner portion at the base position of the narrow portion, the arc-shaped portion formed at the starting end position of the opening edge of the opening portion. The connecting portion is formed with a curvature that is substantially equal to the curvature.
[0010]
[Action and effect of the invention]
According to the first aspect of the present invention, the width dimension of the first and second regions is continuously changed from the center in the length direction of the clamp main body portion to both ends. I tried not to provide a place where the abrupt changes. For this reason, when a clamp main-body part is deform | transformed into a diameter-expanded state, stress does not concentrate on a specific site | part. Therefore, there is no problem of deviation, and the roundness of the clamp main body is highly retainable, so that the tightening force can be made uniform along the circumferential direction.
[0011]
According to the second aspect of the present invention, if the starting end of the opening is formed in an arc shape, the opening can be easily formed by punching with a press. Even in this case, the base position of the narrow portion is set at a symmetrical position with respect to the arc-shaped portion and the length direction, and a connecting portion is formed in this portion with substantially the same curvature as the arc-shaped portion. It is possible to avoid stress concentration and contribute to uniform tightening force.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
First, in order to help understanding of the present invention, the example shown in FIG.
FIG. 1 shows a developed state of the hose clamp according to the first embodiment. The hose clamp is made of a strip-shaped leaf spring material. As a result of being bent in an approximately annular shape with the central axis in the length direction (Y-axis in Fig. 1) as a boundary, a clamp body that can tighten the hose is provided. Further, first and second knob operation pieces as described later are provided at both ends thereof.
[0013]
For the convenience of the following description, the right side of the drawing from the Y axis in FIG.
Now, the interval between the outer edges of the entire first region 1 is formed to have a uniform dimension from the Y axis to the tip. Further, the first region 1 is provided with an opening 3 extending to a range in which a part of the tip edge is left starting from the Y axis. The opening 3 is formed so as to be symmetric with respect to the central axis (X axis in FIG. 1) in the width direction when the hose clamp is in the unfolded state, so that the opening width increases linearly from the start end to the tip end side. Is formed.
[0014]
On the other hand, the second region 2 is also formed to be symmetric with respect to the X axis, and the width dimension is continuously reduced from the Y axis to the tip. However, only the same dimension 5 as the length dimension of the portion which becomes the connecting piece 4 at the tip in the first region 1 has a uniform width. In addition, the width dimension at an arbitrary position in the second region 2 is equal to the total width dimension of the portion (the portion with meat) sandwiching the opening at a position equidistant from the Y axis in the first region. . That is, the change rate of the width dimension is the same in the first and second regions.
[0015]
In the unfolded leaf spring material, the first and second regions 1 and 2 are bent in a ring shape with the Y axis as a boundary. And the front-end | tip part in the 2nd area | region 2 crosses on the substantially same peripheral surface through the opening part 3 of the 1st area | region 1. FIG. Further, the distal ends of the first and second regions 1 and 2 are bent radially outward to form a knob operation piece, whereby a hose clamp is completed.
[0016]
Thus, in the case shown in FIG. 1, the clamp body portion of the hose clamp is held in the diameter-expanded state by picking both knob operation pieces and bringing them closer to each other. Here, in the 1st area | region 1 in a hose clamp, the opening width of the opening part 3 changes continuously toward a front-end | tip, and the location where the width dimension changes rapidly like the past is not provided. Therefore, there is no stress concentration and the stress can be distributed over the entire length. Moreover, in the above, the width dimension on the second region 2 side is changed by the combined dimension of both side portions at an arbitrary position in the opening. That is, the combined dimension (Y1 + Y2) of both side portions of the opening at a position at an arbitrary distance (distance indicated by X1) from the Y axis in the first region 1 is equidistant from the Y axis in the second region 2. It is equal to the width dimension at the position (Y3 = Y1 + Y2). For this reason, since the first and second regions 1 and 2 are symmetrical with respect to the Y axis, the stress distribution state is also symmetric in both regions, resulting in uniform tightening force over the entire circumference. Can be achieved.
[0017]
<First Embodiment>
2 and 3 show a first embodiment of the present invention. In the first embodiment, the starting end of the opening 3 in the first region 1 is set at a location separated from the Y axis by a certain dimension (A dimension). In addition, the starting end is formed in an arc shape so that the opening 3 can be formed by punching with a press. Furthermore, the opening 3 extends at a predetermined inclination angle (θ1) from the starting end to the substantially central portion (at a distance of B from the Y axis), and is formed so that the opening width increases linearly. The range from the part to the end is formed with a slightly smaller inclination angle (θ2; θ1> θ2). Note that the openings 3 are formed symmetrically with respect to the X axis, as in the above-described example.
[0018]
On the other hand, in the second region 2, a step 6 is formed in an arc shape at both outer edge portions at the same distance as the distance from the Y axis to the starting end of the opening 3. The step 6 is formed with the same curvature as the starting end of the opening 3, and is formed with a uniform width equal to the width between the outer edges of the first region 1 from the Y axis to the step 6. . Then, between the step 6 and a predetermined position (position at a distance of B from the Y axis), both outer edges make a predetermined inclination angle (θ1), and thereafter, a slightly smaller inclination angle (θ2; θ1> θ2) is set. Furthermore, the width of the tip of the second region is the same as that of the connecting piece 4 of the first region 1, and the width of the second region 2 changes in three stages. become.
As in the example described above, the change rate of the width dimension between the outer edges in the second region 2 is set to be the same as the change rate of the combined width size in the first region 1.
[0019]
FIG. 3 shows a state in which the unfolded state shown in FIG. 2 is circularly bent and a portion where the width dimension in the second region 2 changes is formed in the opening 3 of the first region 1 so that substantially the same peripheral surface is formed. Thus, the clamp body 7 is formed. Further, the tip portions of the first and second regions 1 and 2 are once erected outward in the radial direction, and then bent at a substantially right angle in the circumferential direction so that the first and second knob operation pieces 8, 9 The clamp body 7 is expanded and deformed when both the knob operation pieces 8 and 9 are operated, and can be restored to its natural state by its own elastic force when released. Although not shown, if the clamp main body 7 is in a state in which the diameter of the clamp main body 7 is expanded using a separate holder, the clamp main body 7 is in a diameter-expanded state by being locked so as to straddle both knobs 8 and 9. It is also possible to hold it as it is.
[0020]
Also in the first embodiment configured as described above, the width dimension of both the first and second regions 1 and 2 is changed substantially continuously, and the abrupt width dimension change point that causes stress concentration is set. Absent. Therefore, a substantially uniform tightening force can be applied to the hose or the like along the entire circumference.
[0021]
<Second Embodiment>
FIG. 4 shows a second embodiment of the present invention. Although the thing of 1st Embodiment changed the width | variety of the opening part 3 in the substantially middle part, in 2nd Embodiment, it is so that an opening width may change continuously with a fixed inclination angle from the start end to a termination | terminus. It is a thing. Also, the entire width of the second region 2 is changed correspondingly.
[0022]
By the way, since the maximum distortion rate was compared in the three forms of the prior art shown in FIGS. 7 and 8, the first embodiment, and the second embodiment, this will be described.
[0023]
The maximum strain rate was determined by computer simulation. In comparison, each form has the same conditions such as plate thickness and material. That is, the plate thickness was 1.2 mm, the maximum plate width was 12 mm, the inner diameter of the clamp body 7 in the natural state was 12.9 mm, and the inner diameter of the clamp body 7 in the expanded state was 17.7 mm. And when calculating the maximum strain at the location (stress concentration location) that produces the maximum strain rate for each form when the diameter is expanded,
(1) Conventional: 6.92 (occurs around the boundary between the triangular window and the gradually changing portion)
{Circle around (2)} Second Embodiment: 4.46 (occurs around the step and the outer edge corresponding to the start of the opening)
{Circle around (3)} First Embodiment: 3.85 (occurs around the portion where the tilt angle changes)
[0024]
Thus, both the first and second embodiments can obtain better results than the conventional one, and it has been found that better stress distribution than the conventional one is achieved. Moreover, it turned out that especially the thing of 1st Embodiment can obtain a favorable result.
[0025]
<Third Embodiment>
FIG. 5 shows a third embodiment of the present invention. In this embodiment, like the one shown in FIGS. 2 and 3, the starting end of the opening 3 is set to the Y axis, but the opening edge is formed in an arc shape at the starting end. The opening 3 is formed so that the width dimension continuously changes from the start end to the end, and the entire width dimension also changes correspondingly in the second region 2.
[0026]
The present embodiment is also effective when the plate width is narrow with respect to the plate thickness, that is, when it is difficult to bend in an annular shape, and the same action as described above also by what is configured in this way An effect is obtained.
[0027]
<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In any of the forms, the starting end of the opening 3 is set in the first area 1, but it may be configured to bite into the second area 2 as shown in FIG. 6. In that case, on the contrary, the place where the step 6 is provided is set in the first region 1 which is equidistant from the Y axis.
(2) The means for holding the clamp body 7 in an expanded state is not only a separate holder but also a part that performs the same function as the holder, i.e., a part that locks the two tabs together. It is also possible to do.
[Brief description of the drawings]
FIG. 1 is a developed view for explaining the solution principle of the present invention. FIG. 2 is a developed view of a hose clamp according to a first embodiment. FIG. 3 is a perspective view. FIG. 4 is a hose clamp according to a second embodiment. FIG. 5 is a development view of a hose clamp according to a third embodiment. FIG. 6 is a plan view of a hose clamp according to another embodiment. FIG. 7 is a development view of a conventional hose clamp. Figure [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... 1st area | region 2 ... 2nd area | region 3 ... Opening part 6 ... Level | step difference 7 ... Clamp main-body part

Claims (2)

A clamp main body formed by circularly bending a belt-shaped leaf spring material in an unfolded state, and first and second erected radially outward from both longitudinal ends of the clamp main body A hose clamp with a knob operation piece of
In the unfolded state , the one side region is defined as a first region for forming the first picking operation piece with the Y axis as a central axis in the length direction as a boundary , and the other one side region is the second picking operation piece. And a second region for forming
While the first region has an opening that is symmetrical with respect to the X axis that is the central axis in the width direction and that increases the opening width almost continuously from the periphery of the Y axis toward the tip,
The second region has a symmetric shape with respect to the X axis, and extends from the position away from the Y axis to the tip by a distance equal to a distance A from the Y axis to the starting end of the opening near the Y axis. The length range is formed so as to be continuously narrow, and when the clamp body portion is bent in an annular shape, the inside of the opening is crossed while forming the same peripheral surface , and the The rate of change of the width dimension of the second region is set to be approximately equal to the rate of change of the width dimension obtained by summing both sides sandwiching the opening in the first region,
Of the opening edge of the opening, the length range between the starting end position near the Y axis and the position substantially at the center in the length direction and separated from the Y axis by a predetermined distance B is the X axis. The length range from the position away from the Y axis by the predetermined distance B to the terminal end of the opening is formed on the X axis. In contrast, an inclination angle (θ2) slightly smaller than the inclination angle (θ1) is formed,
Of the side edges in the narrow portion of the second region, the length between a position separated from the Y axis by the distance A and a position separated from the Y axis by a distance equal to the predetermined distance The range is formed so as to form an inclination angle equal to the θ1 with respect to the X-axis, and extends from a position away from the Y-axis by a distance B to a terminal portion of the narrowed portion. The hose clamp is characterized in that a length range is formed with an inclination angle equal to the θ2 with respect to the X axis . The corner portion at the base position of the narrow portion is formed with a joint portion having a curvature substantially equal to the curvature of the arc-shaped portion formed at the starting end position of the opening edge of the opening portion. The hose clamp according to claim 1, wherein:

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