JPH1026108A - Fastening band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening band which does not produce thinning of a band member in the board thickness direction even if a lever is repeatedly bent, and has an improved durability and reliability. SOLUTION: This tightening band is designed such that both end sides of a metallic band member 2 are overlapped to be mitered so as to form the whole form in a ring shape, a lever 4 is joined with the mitered part, and a grip side end part 4b is bent with a fulcrum side end part 4a of the lever 4 being as a fulcrum to collapse the lever 4 so as to be along the circumferential surface of the band member for reducing the diameter of the band member 2. In this case, the lever 4 is surface-treated so that the edge parts of the fulcrum side end part 4a of the lever 4 in the width direction and board thickness direction are removed to make the tip part a curved chape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal band member which is overlapped on both ends so as to form a substantially ring-like shape, and a lever is joined to the joint portion. The present invention relates to a tightening band for reducing the diameter of the band member by tilting the lever along the peripheral surface of the band member with the end portion serving as a fulcrum.

[0002]

2. Description of the Related Art Conventionally, a fastening band called a one-touch band has been used as a fastening band for fastening a member to be fastened such as a cover of a joint portion of an automobile or a hose. This is done by forming a metal band member into a ring shape so that both ends of the metal band members overlap each other and overlapping them, and by inserting a tightening band in which a lever is joined to the joint portion by spot welding in the axial direction to the member to be tightened. By bending the lever side end along the peripheral surface of the band member using the lever as a fulcrum, the band member is reduced in diameter and the member to be tightened is tightened.

[0003]

When a relatively elastic material such as a rubber joint cover or a rubber hose is tightened as a material to be tightened using the tightening band, even if the tightening is performed with a low tightening force, High sealing performance was maintained by returning the material to be tightened.

However, when a relatively low elastic material such as a resin joint cover is tightened as a member to be tightened, it is necessary to tighten the band member with a high tightening force in consideration of the sealing property. In this case, if the handle is bent along the peripheral surface of the band member using the lever as the fulcrum side end, the contact portion with the fulcrum side end of the band member extends in the longitudinal direction. If an edge is formed at the fulcrum-side end, the band portion in contact with the edge is reduced in thickness, and local stress concentration is apt to occur, and the band is more easily broken than the reduced thickness portion. This is remarkable especially when the band member abutting on the fulcrum side end of the lever has a flaw or variation in plate thickness. Further, when the bending of the lever is repeated, the breaking strength of the band member is significantly reduced.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and even if the band member is tightened with a high tightening force or the lever is repeatedly bent, the band member does not lose its thickness in the thickness direction, and the durability is improved. An object of the present invention is to provide a tightening band with improved reliability.

[0006]

The present invention has the following means to achieve the above object. That is, the two ends of the metal band member are overlapped so as to form a joint, and the entire shape is substantially formed in a ring shape, and a lever is joined to the joint part, and the lever is attached to an end of the lever as a fulcrum. In a tightening band in which the diameter of the band member is reduced by falling down along the peripheral surface of the band member, the lever is subjected to a surface treatment so that an edge portion in a width direction and a plate thickness direction of a fulcrum side end of the lever is processed. It is characterized in that the tip is formed into a curved shape by removing.

The surface treatment applied to the lever is preferably a barrel polishing treatment or a shot blast treatment.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing the configuration of a tightening band, FIG. 2 is an explanatory view showing a tightened state of a lever subjected to barrel polishing and a broken state due to repeated bending, and FIG. 3 is a conventional tightened state of a lever without any processing. And FIG. 4 is a comparative explanatory view showing a tightened state of a conventional chamfered lever and a broken state due to repeated bending, and FIG. 5 is a comparative explanatory view showing a broken state due to repeated bending. It is a graph which compares the number of times of bending until breakage of a band member.

First, the structure of the tightening band will be described with reference to FIG. Reference numeral 1 denotes a so-called one-touch type tightening band, and a metal band member 2 is used. The band member 2 is formed in a ring shape by overlapping the both ends so that the two sides overlap. A lever 4 is joined to the joint portion 3 of the band member 2 by spot welding. The lever 4 is formed in an arc shape so as to be in close contact with the peripheral surface of the band member 1 when bent.
The joint portion 4c on the side of the curved projecting surface is joined to the palm joint portion 3. The band member formed in a ring shape by bending the handle side end 4b in the direction of the arrow shown in FIG. 1 with the fulcrum side end 4a of the lever 4 as a fulcrum and falling along the peripheral surface of the band member 2. 2, the member to be tightened can be tightened. As the band member 2 and the lever 4, a relatively soft band-shaped metal material containing iron, for example, stainless steel (SUS430) is preferably used. Since the lever 4 receives a large tightening force, the band member 2 (having a plate thickness of about 0.4 mm) is used.
For this purpose, a sheet having a sufficiently large thickness (about 1.2 mm in thickness) is used.

The lever 4 may be subjected to a barrel polishing process (a process in which a lever and an abrasive are put into a barrel and water is added to rotate the same) or a shot blast process (a process in which a small steel ball is blown against the lever by air force). ) Etc. are applied. As a result, the edge portion is removed in the width direction and the plate thickness direction of the fulcrum-side end 4a of the lever 4, and the tip is formed into a curved shape. In addition, the surface treatment causes surface hardening, and the strength of the lever 4 is improved.

Next, referring to FIG. 2 to FIG. 5, the tightening state of the lever 4 of the tightening band 1 and the broken state due to repeated bending will be explained by the difference between the working state of the lever 4 in the present invention and the conventional tightening band. A comparison will be described. As described above, the lever 4 is connected to the band member 2.
Although a thicker plate is used, the breaking strength of the band member 2 greatly differs depending on whether or not any processing is performed on the fulcrum-side end 4a of the lever 4. The relationship between the number of bending of the lever 4 and the breaking strength of the band member 2 is as follows.
When the lever 4 is repeatedly bent without any processing on the fulcrum-side end 4a (see FIG. 3), when the corner of the fulcrum-side end 4a of the lever 4 is repeatedly bent with a chamfered process (see FIG. 3). 4) and a case where the lever 4 is repeatedly bent in a state in which barrel polishing is performed (see FIG. 2).

FIG. 3A shows a fulcrum-side end 4a of the lever 4.
3 shows a tightened state of the conventional tightening band 1 which is not subjected to any chamfering, and shows a state in which the thickness of the band member 2 is reduced at the edge A of the fulcrum-side end 4a. FIG. 3B shows a broken state when the lever 4 is repeatedly bent. It can be seen that the band member 2 is broken at the edge portion A of the fulcrum-side end 4a because the thickness of the band member 2 is reduced.

FIG. 4A shows a fulcrum side end 4a of the lever 4.
Shows the tightened state of the conventional tightening band 1 in which the corner portion B is chamfered, and the thickness of the band member 2 is slightly reduced in the width direction at the corner portion B of the fulcrum-side end 4a. I understand the state. FIG. 4B shows a broken state when the lever 4 is repeatedly bent. It can be seen that the band member 2 is broken at the corner B of the fulcrum-side end 4a because the thickness of the band member 2 is reduced in the width direction. Comparing the number of times the band member 2 is completely folded, as shown in FIG. 5, it can be seen that the band without the chamfer processing breaks about three times and the band with the chamfer processing breaks about seven times.

In the tightening operation of the lever 4 of the conventional tightening band 1 shown in FIG. 3 and FIG.
When the band member 2 is deformed so that the thickness of the band member 2 is slightly reduced, for example, when the band member 2 is tightened with a high tightening force or when the lever 4 fails to bend and is repeatedly bent, the durability is remarkably increased. descend. That is,
When the thickness of the band member 2 is reduced in the thickness direction, the lever 4 is bent, so that the contact portion of the band member 2 with which the fulcrum-side end 4a contacts is elongated in the longitudinal direction. Concentration occurs, and when metal fatigue and corrosion progress, it is easy to break, leading to a decrease in reliability.

On the other hand, the tightening band 1 according to the present invention
As shown in FIG. 2, the fulcrum-side end 4a of the lever 4 has an edge portion removed in the width direction and the plate thickness direction to form a curved end portion. When the lever 4 is attached to the member in the axial direction and the handle-side end 4b of the lever 4 is bent along the peripheral surface of the band member 2, FIG.
The fulcrum-side end 4a formed in a curved shape as shown in FIG.
With the fulcrum as a fulcrum, the contact surface of the band member 2 is deformed into a bag shape and smoothly bent, and the fulcrum-side end 4a is housed in a bag shape on the contact surface of the band member 2. At this time, since the fulcrum-side end 4a is formed in a curved surface shape with an edge portion removed in the width direction and the plate thickness direction, the contact portion of the band member 2 is plastically deformed into a bag shape, but in the plate thickness direction. There is no local thinning. In other words, even when the band member 2 is tightened with a high tightening force, the band portion that comes into contact with the fulcrum-side end 4a is easily extended in a bag-like manner over the entire surface, and the elongation can absorb the stress over the entire contact surface. No local stress concentration occurs as compared with the tightening band shown in FIGS. Therefore, the band member 2 with which the fulcrum-side end 4a of the lever 4 abuts can be plastically deformed into a bag shape and the stress can be dispersed over the entire abutment surface, so that the breaking strength can be improved.

FIG. 2B shows a state of breakage when the lever 4 is repeatedly bent. Although the break point is broken at a different point from the break point of the band member by the conventional lever, it depends on the processing accuracy of the lever 4 and the stress applied to the band member 2, but it is generally experimentally determined that the fulcrum side end portion is broken. It is presumed that the band member 4a comes into contact and breaks at a portion where the band member is plastically deformed into a bag shape by bending.

Here, referring to FIG.
Comparing the number of times the lever 4 was bent before breaking with the conventional one, it was found that the number of times the surface-treated lever 4 was bent was about 14 times, about twice that of the chamfered one.

According to the above configuration, since the breaking strength when the lever 4 is repeatedly bent is significantly improved as compared with the conventional product, the band member 2 can be tightened with a high tightening force.
The durability of the band member 2 can be maintained at a high level even if the bending of the lever 4 fails and is restarted. Further, since the fulcrum-side end 4a of the lever 4 is formed in a curved surface with an edge portion removed in the width direction and the plate thickness direction, when the lever 4 is bent, the contact surface of the band member 2 is formed into a bag-like shape. Due to the deformation, the thickness is not locally reduced in the plate thickness direction, stress concentration occurs in the reduced thickness portion, metal fatigue, corrosion, and the like hardly occur, and the reliability of the tightening band can be improved. As described above, the tightening band 1 according to the present invention is configured such that the fulcrum-side end 4a of the lever 4 is formed into a curved surface, so that a relatively low elastic member to a relatively high elastic member. It can be used for a wide range of objects to be tightened, improving versatility. Therefore, as a configuration of the tightening band 1, a lever 4 having a relatively thin plate member 2 subjected to barrel polishing or shot blasting to form a fulcrum-side end 4a with a curved surface is combined. By using this, a great effect of improving the strength and versatility of the band member 2 can be obtained.

As mentioned above, various preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and may be subjected to many more modifications without departing from the spirit of the invention. Of course you get it.

[0020]

As described above, according to the present invention, since the breaking strength when the lever is repeatedly bent is significantly improved as compared with the conventional product, even if the band member is tightened with a high tightening force or the lever is bent again. High durability of the band member can be maintained. Therefore, it can be used for a wide range of objects to be tightened from a relatively low elastic member to a relatively high elastic member, and the versatility of the tightening band is improved. In addition, since the fulcrum side end of the lever is formed in a curved surface with the edge portion removed in the width direction and the plate thickness direction, when the lever is bent, the contact surface of the band member is plastically deformed into a bag shape, There is no local thickness reduction in the thickness direction, extreme stress concentration, metal fatigue, corrosion, and the like hardly occur, and the reliability of the tightening band can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a tightening band.

FIG. 2 is an explanatory diagram showing a tightened state of a lever subjected to barrel polishing and a broken state due to repeated bending.

FIG. 3 is a comparative explanatory view showing a tightened state and a broken state due to repeated bending of a conventional lever which is not subjected to any processing.

FIG. 4 is a comparative explanatory view showing a tightened state and a broken state due to repeated bending of a lever which has been subjected to a conventional chamfering process.

FIG. 5 is a graph comparing the number of times the band member is broken by the lever of the present invention and the conventional tightening band until the band member is broken.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tightening band 2 Band member 3 Joint part 4 Lever 4a Supporting end 4b Handle end 4c Joint

Claims (3)

[Claims] 1. A metal band member is superimposed on both ends so as to form a ring shape so as to form a substantially ring-like shape, and a lever is joined to the joint portion, and the end of the lever is used as a fulcrum. In a tightening band for reducing the diameter of the band member by tilting the lever along the peripheral surface of the band member, a surface treatment is performed on the lever, and a width direction and a thickness direction of a fulcrum side end of the lever are applied. 2. The tightening band according to claim 1, wherein an edge portion is removed to form a tip portion into a curved shape. 2. The tightening band according to claim 1, wherein the surface treatment performed on the lever is a barrel polishing process. 3. The tightening band according to claim 1, wherein the surface treatment applied to the lever is a shot blast treatment.