JPH08247363A - Coil spring type hose clamp - Google Patents

Abstract

(57) [Summary] [Purpose] A hose clamp that can evenly pressurize the outer circumference of the hose to ensure uniform sealability and can maintain excellent sealability by following stress relaxation due to hose fatigue. provide. [Structure] Both side edges 12 along a length direction are made of a linear flat metal spring material 11, and the metal spring material 11 is formed in a spiral shape having the same diameter so that the side edges 12 are in sliding contact with each other. Coil spring type hose clamp 10. The hose clamp 10 can hold the expanded diameter by the holder 14, and the holder 14 is removed to reduce the diameter.

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 connecting pipe, and the hose is fixed to the connecting pipe by the clamping 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.
A general structure is one in which the protrusion 2b provided at the other end is inserted into the notch 3. 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.

[0011]

In order to achieve the above object, a hose clamp provided by the present invention is made of a flat belt-shaped metal spring material, and both side edges along the length direction thereof are linear, 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 diameter of the hose clamp increases when it is attached to a hose, but the holder holds the expanded hose clamp near both ends and holds it in the expanded state, or the hose clamp is inserted into the inner circumference of the expanded hose clamp. It is characterized in that it is provided with a holder for holding the diametrically expanded state.

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 or FIG. 2, basically, a metal spring material 11 in the form of a flat strip whose side 12 along the length direction is linear is formed.
Is formed in a spiral shape with the same diameter so that the side edges 12 are in sliding contact with each other, and both ends 13a, 13b, 13c, 13d of the spirally wound metal spring material 11 are released.

Since the whole hose clamp 10 has a spiral shape, the whole diameter can be expanded by pushing in both ends 13a, 13b, 13c, 13d or opening it from the inner peripheral side. Moreover, as shown in FIG. 1, the hose clamp 10 having the expanded diameter can be maintained in the expanded diameter state by using the holder as shown in FIG. 1 or 2.

That is, for example, as shown in FIG. 1, both ends 13a and 13b of the metal spring material 11 are formed into projecting pieces protruding to the outer peripheral side, and two projecting pieces of these both ends 13a and 13b can be inserted. By holding both ends 13a and 13b with the holder 14 provided with the groove portion, it is possible to easily hold the expanded state.

Further, as shown in FIG. 2, a cylindrical holder 15 having an outer diameter substantially equal to the inner diameter of the expanded hose clamp 10 and axially divided into two parts detachably from the outer circumference of the hose is used. By inserting the cylindrical holder 15 into the inner circumference of the expanded hose clamp 10, it is possible to easily maintain the expanded condition.

In this expanded state, the hose clamp 10 must be spirally wound at least once. Further, when the holder 14 for gripping the protruding piece as shown in FIG. 1 is used, the hose clamp 1 having the expanded diameter is used.
It is necessary that both ends 13a and 13b of 0 be positioned so as to overlap each other in the axial direction.

When the hose clamp 10 is attached to the outer circumference of the hose, the hose clamp 10 whose diameter is expanded and held by the holder 14 or 15 as shown in FIG. 1 or 2 is used as shown in FIG. The hose clamp 10 and the end of the hose 17 are inserted into the end of the connection pipe 16, and then the holder 14 is removed.

By removing the holder 14, the expanded diameter of the spiral hose clamp 10 naturally decreases due to the force of the spring, and as shown in FIG.
It is tightened to a state where an appropriate tightening force is applied to the outer periphery of the both ends, and the positions of both ends 13a and 13b are also displaced.

In the coil spring type hose clamp of the present invention, the number of spiral turns of the metal spring material depends on the diameter of the hose into which the hose clamp is inserted and the spring force of the metal spring material used. It can be appropriately determined to obtain an appropriate tightening force.

Thus, the hose clamp 10 of the present invention.
Is a metal spring material 1 formed in a spiral shape, and both ends 13a, 13b, 13c, 13d thereof are open, so that the diameter of the hose 17 is reduced to a perfect circle when the diameter is reduced. The outer circumference of the hose can be uniformly pressed when tightening the outer circumference. 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 is flattened, the hose 17 can always be tightened with an appropriate tightening force in accordance with the stress relaxation of the hose, and the excellent sealing property can be maintained forever.

Further, since the hose clamp 10 shown in FIG. 2 has no protruding portion, once attached to the outer circumference of the hose, it cannot be easily removed by a general user except for cutting.

[0025]

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. It is possible to provide a new hose clamp capable of Moreover, if the both ends have no protrusions, general users cannot easily remove the hose after mounting it on the outer periphery of the hose.

[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 perspective view showing a state in which another specific example of the hose clamp of the present invention is expanded and held by another holder.

FIG. 3 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. 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, 13c, 13d Both ends 14, 15 Holder 16 Connection pipe 17 Hose

Claims (3)

[Claims] 1. A flat spring-shaped metal spring material, wherein both sides along the length direction are linear, and the metal spring material has a spiral shape with the same diameter so that the side edges are in sliding contact with each other. Coil spring type hose clamp characterized by being formed in. 2. A flat spring metal spring member having straight sides on both sides along the length direction, and the metal spring member having a spiral shape with the same diameter so that the side faces are in sliding contact with each other. The coil spring type hose clamp, further comprising: a holder for holding the expanded diameter hose clamp near both ends thereof and holding it in the expanded diameter state. 3. A flat spring metal spring member, wherein both sides along the length direction are linear, 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. The coil spring type hose clamp, further comprising a holder that is inserted into an inner circumference of the expanded hose clamp and holds the hose clamp in the expanded condition.