JPH08247362A - Coil spring type hose clamp - Google Patents

Abstract

PURPOSE: To provide a hose clamp which is capable of evenly pressurizing the outside periphery of a hose to ensure uniform sealing performance and maintaining excellent seal in response to the relaxation of stress due to permanent set in fatigue, and which is incapable of being easily removed by general users. CONSTITUTION: The coil spring type hose clamp is made up of flat belt-shaped metal spring materials 11, both longitudinal sides 12 of the metal spring materials 11 are formed corrugated, and the metal spring materials 11 are formed into the shape of spirals of the same diameter so that the sides 12 are slidably in contact with each other. The hose clamp 10 can be kept in the diameter-enlarged state by means of a holder 14, and can be contracted in diameter by removing the holder 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose clamp for fixing a hose fitted to an end of a connecting pipe to the connecting pipe.

[0002]

2. Description of the Related Art Conventionally, when connecting and fixing a hose to devices, a clamp is attached to the outer periphery of the hose fitted to the end of the connection pipe, and the hose is fixed to the connection pipe by the tightening force of the clamp. Has been done.

This hose clamp is roughly classified into a spring type clamp in which a flat strip-shaped spring material is formed in a ring shape, a screw type clamp in which both ends of a plate material formed in a substantially ring shape are tightened with screws, and a metal ring is added from the outer periphery. It is classified as a caulking type that is tightened and fixed.

As shown in FIG. 5, for example, the spring type clamp is composed of a flat strip-shaped spring material 1 which has a protrusion 2a at one end thereof and a notch 3 formed therein.
In general, the notch class 3 has a structure in which the protrusion 2b provided at the other end is inserted. This spring type clamp expands the diameter by pressing the projections 2a, 2b at both ends with a finger or a tool to bring them closer, and if the pressed projections 2a, 2b are separated, the diameter of the hose is reduced by the force of the spring to tighten the outer circumference of the hose. You can do it.

In the screw type clamp, as shown in FIG. 6, a plate member 4 made of metal is formed into a substantially ring shape with both ends thereof separated, and screw holes provided at both separated ends 5a and 5b. The end of the hose is tightened by passing the screw 6 between the two and tightening the screw 6 to bring both ends 5a and 5b close to each other and reducing the diameter. Further, the caulking type clamp is configured such that a metal ring is inserted into the outer circumference of the hose and the outer circumference is mechanically crimped to reduce the diameter, thereby tightening the outer circumference of the hose.

However, in any of the above spring type, screw type and caulking type clamps, it is difficult to uniformly pressurize the outer circumference of the hose because the diameter of the clamp is not reduced to a perfect circle. However, there is a drawback that uniform sealing properties cannot be obtained along the circumferential direction.

In addition, in the screw type clamp, if the tightening force of the screw is weak, leakage immediately occurs, so that it is extremely important to control the tightening torque. Further, particularly in the case of the caulking type clamp, it is necessary to control the wall thickness by polishing the hose and the control of the tightening diameter, and if these controls are not appropriate, excellent sealing performance cannot be obtained.

Further, in the case of the screw type clamp and the caulking type clamp, the tightened state of the clamp does not change, even if the hose deteriorates during use and its elasticity decreases, so-called sag phenomenon occurs, Cannot follow the stress relaxation. For this reason, there is a problem that the sealing property is deteriorated unless the screw tightening and the tightening are performed again.

Further, in the spring type clamp and the screw type clamp, as can be seen from FIGS. 5 and 6, the protrusions 2a, 2b or the end portions 5a, 5b are protruded from the outer circumference of the hose, which is an obstacle, and the protrusion 2a, There is a drawback that general users can easily remove it by pressing 2b or loosening the screw 6 that fastens the ends 5a, 5b.

[0010]

In view of the above conventional circumstances, the present invention can uniformly pressurize the outer circumference of the hose to ensure a uniform sealability, and follow stress relaxation due to sag of the hose. It is an object of the present invention to provide a hose clamp that can maintain excellent sealing performance forever and cannot be easily removed by general users.

[0011]

In order to achieve the above object, a hose clamp provided by the present invention is made of a flat strip-shaped metal spring material, and both side edges along the length direction thereof are formed in a corrugated shape. The coil spring type hose clamp is characterized in that the metal spring material is formed in a spiral shape having the same diameter so that the side edges are in sliding contact with each other.

Further, the coil spring type hose clamp is
The hose clamp, which expands in diameter when inserted into a hose, expands in a state where the corrugations on adjacent sides engage with each other, is equipped with a holder that holds the expanded hose clamp in an axially expanded state near both ends. It is characterized by that.

The material of the metal spring material used in the coil spring type hose clamp of the present invention is not particularly limited, and may be a metal material conventionally used as a spring material, such as high carbon steel or silicon. There are iron-based materials such as manganese steel, manganese chrome steel, chrome vanadium steel, and chrome steel, and iron-nickel-based materials.

[0014]

OPERATION The coil spring type hose clamp 10 of the present invention.
As shown in FIG. 1, basically, a flat spring metal spring member 11 is formed in a spiral shape with the same diameter so that the side edges 12 are in sliding contact with each other. Both ends 13a and 13b of the spring material 11 are released. In particular, both sides 1 along the length of the metal spring material 11
2 is formed in a waveform.

Since the whole hose clamp 10 has a spiral shape, the whole diameter can be expanded by pushing in both ends 13a, 13b or pushing open from the inner peripheral side. Moreover, as shown in FIG. 1, the diameters of the adjacent side edges 12 are expanded so that the waveforms are meshed with each other, and both ends 13a and 13b are axially pressed by the holder 14 so that the diameter is easily expanded. It is possible to hold.

In this expanded state, it is necessary that the hose clamp 10 be spirally wound at least one round or more and that both ends 13a and 13b be positioned so as to overlap each other in the axial direction. This is because it is difficult for the holder of any shape to maintain the expanded state unless it is in the expanded state.

The holder 14 shown in FIG. 1 as an example of the holder is provided with projecting pieces 15a and 15b projecting in parallel in the same direction at both ends of a straight holder body 14a, and the projecting pieces 15a and 15b are expanded in diameter. Sometimes hose clamp 1
Both ends 13a and 13b of 0 are sandwiched in the axial direction to prevent the waveforms meshed with each other from shifting.

The shape of the holder is not limited to that shown in FIG. 1, and since the expanded hose clamp 10 has the corrugations on the adjacent sides meshing with each other, it can be held so that the meshing of the corrugations does not shift. It may have any other shape if possible.

If one of the protrusions 15a of the holder 14 is made long so as to be in contact with the end edge of the hose 17 as shown in FIG. 2, the hose clamp 10 when it is attached to the hose is fixed. It is also possible to perform the alignment using the holder 14.

When the hose clamp 10 is attached to the outer circumference of the hose, the hose clamp 10 expanded in diameter as shown in FIG. 1 and held by the holder 14 is inserted into the end of the hose 17 as shown in FIGS. Then, after inserting the end of the hose 17 together with the hose clamp 10 into the end of the connection pipe 16, the holder 14 is removed.

By removing the holder 14, the diameter of the spirally-shaped hose clamp 10 is naturally reduced while the corrugated waveforms are meshed one by one by the force of the spring, and the hose is compressed as shown in FIG. Tighten the outer circumference of 17 until a proper tightening force is applied,
The positions of a and 13b are also displaced. In this state, the corrugations on the adjacent sides may be intermeshed with each other or may be in a state in which they are not intermeshed.

In the coil spring type hose clamp of the present invention, the number of turns of the spiral of the metal spring material, the size and pitch of the corrugations provided on the sides are determined by the diameter of the hose into which the hose clamp is inserted and the metal used. It can be appropriately determined so as to obtain an appropriate tightening force depending on the spring force of the spring material.

Thus, the hose clamp 10 of the present invention.
Is a metal spring material 1 formed in a spiral shape, and both ends 13a and 13b thereof are open. Therefore, when the diameter is expanded, the diameter is reduced to a perfect circle and the outer circumference of the hose 17 is tightened. At this time, the outer circumference of the hose can be uniformly pressed. Therefore, it is possible to secure a uniform sealing property in the circumferential direction over the entire outer circumference of the hose 17.

In addition, the hose clamp 10 having the outer periphery of the hose 17 is always subjected to the force of the spring in the direction of the diameter reduction until it is initially in the spirally formed minimum diameter reduction state. Therefore, even if the hose 17 gets tired, the hose 17 can always be tightened with an appropriate tightening force while keeping the position of the adjacent corrugations following the stress relaxation of the hose, and the excellent sealing property can be maintained forever. It is possible to

Furthermore, since this hose clamp 10 has no protruding portion, once it is attached to the outer circumference of the hose,
Other than cutting, it is impossible for general users to easily remove it.

[0026]

According to the present invention, it is possible to uniformly pressurize the outer circumference of the hose to ensure a uniform sealability, and to keep excellent sealability forever by following the stress relaxation due to the fatigue of the hose. Therefore, it is possible to provide a new hose clamp that can be easily removed by general users.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a specific example of a hose clamp of the present invention, the diameter of which is expanded and held by a holder.

FIG. 2 is a schematic partially cutaway side view showing a state in which the expanded hose clamp of the present invention is inserted into the outer circumference of the hose.

FIG. 3 is a schematic plan view showing a state in which the expanded hose clamp of the present invention is inserted into the outer circumference of the hose.

FIG. 4 is a schematic plan view showing a state in which the outer circumference of the hose is clamped by the hose clamp of the present invention.

FIG. 5 is a schematic perspective view showing an example of a conventional spring clamp.

FIG. 6 is a schematic perspective view showing an example of a conventional screw clamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spring material 2a, 2b Projection part 3 Notch part 4 Plate material 5a, 5b End part 6 Screw 10 Hose clamp 11 Metal spring material 12 Sides 13a, 13b Both ends 14 Holder 14a Holder body 15a, 15b Projection piece 16 Connection pipe 17 Hose

Claims (2)

[Claims] 1. A flat spring metal spring member, wherein both sides along the lengthwise direction are formed in a corrugated shape, and the metal spring member has a spiral shape with the same diameter so that the side faces are in sliding contact with each other. Coil spring type hose clamp characterized by being formed in. 2. A flat spring-shaped metal spring material, wherein both sides along the length direction thereof are formed in a corrugated shape, and the metal spring material is formed in a spiral shape having the same diameter so that the side edges are in sliding contact with each other. Which is a hose clamp formed in the above, wherein the hose clamp is expanded in such a manner that the corrugations on the adjacent sides are engaged with each other,
The coil spring type hose clamp, characterized in that the coil spring type hose clamp is provided with a holder that is pressed in the axial direction in the vicinity of both ends thereof and holds the expanded state.