JPH0755366Y2 - Clamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention mainly relates to a clamp for fixing a bellows, a hose and the like to the outer circumference of a pipe.

[Conventional technology]

FIG. 6 is a perspective view showing a conventional hose clamp, and FIG. 6 (a) shows a state before the hose is fastened.
FIG. 6 (b) is a perspective view showing a state after the hose is fastened.

The clamp is formed by bending a metal strip 20 into an annular shape. The strip 20 has a strip 20 in the middle in the longitudinal direction.
A step portion 21 corresponding to the thickness of itself is formed so as to extend in the width direction from one side edge of the belt-shaped body 20 toward the other side edge thereof, and the side portion is closer to one end side than the step portion 21 in a side view. An ear portion 22 that is curved in a letter shape and protrudes toward one side is formed, and further, a plurality of engaging holes 23 formed by punching are formed in line at one end portion. On the other hand, a plurality of locking projections 24 that engage with the engagement holes 23 are formed in a line near the other end side of the step portion 21.

Then, such a band-shaped body 20 is made to make one turn in a spiral shape so that the ears 21 project to the outer peripheral side, and both ends are outwardly at one end where the engaging holes 23 and ears 22 are formed. Further, the other end portion where the locking projection 24 is formed is inwardly overlapped for a required length.

Thus, in such a clamp, for example, after the hose is fitted on the end of the pipe, the belt-shaped body 20 is looped.
Is located on the outer periphery of the hose end, and while still wound around the outer peripheral surface of the hose, engage the engagement hole 23 at one end with the locking projection.
24, and the ears 22 are crimped in this state so as to compress them in the circumferential direction. As a result, the other end located on the inner side and the outer peripheral surface of the hose formed by the step portion 21 and the strip-shaped body are
Move the inside of the gap with 20 toward the vicinity of the step 21 in the circumferential direction by a dimension corresponding to the reduction of the ear 22, tighten the hose to the outer peripheral surface of the pipe, and fix the hose to the outer periphery of the pipe. To do.

By the way, in such a clamp, when the ears 22 are crimped, the other end of the strip 20 moves to the vicinity of the step 21, but does not always move to the position where it hits the step 21. Therefore, there is a sixth gap between the other end terminal and the step portion 21.
A gap d may be formed as shown in FIG.

When such a gap d is formed, when the hose is made of, for example, rubber having high elasticity, a crack may be generated by pinching the outer periphery, and a synthetic resin hose having relatively poor elasticity is used. In this case, the fastening force is interrupted at a portion corresponding to the gap d, which causes a leakage of liquid or the like.

As a countermeasure against this, a clamp as shown in FIG. 7 has been proposed (Japanese Patent Laid-Open No. 55-152993). FIG. 7 (a) is a perspective view showing a state before fastening of a conventional clamp, and FIG. 7 (b) is a perspective view showing a state after fastening similarly.

Similar to that shown in FIG. 6, the metal strip 30 has a step portion 31 in its middle portion and an ear portion 32 on one end side thereof,
Further, an engaging hole 33 is formed at one end, a locking projection 34 is formed at the other end, and a tongue piece 35 is provided at the end of the other end from the center in the width direction. The step portion 31 formed in the middle of the strip-shaped body 30 in the longitudinal direction forms a concave portion 31a cut according to the shape of the tongue piece 35, and the convex portions 3 on both sides thereof.
1b and 31b are formed, and the strip 30 is looped to form the ear 32.
When crimped, as shown in FIG. 7 (b), the tongue piece 35 at the other end
Are fitted in the step portion 31 so that the fastening force with respect to the hose is continuous in the circumferential direction of the band-shaped body 30.

[Problems to be solved by the device]

By the way, in such a conventional product, the tongue piece 35 is replaced by the strip-shaped body 30.
On the other hand, the stepped portion 31 is provided with a cut concave portion 31a for positioning the tongue piece 35 at the central portion in the width direction at the other end portion of the concave portion 31a. Part 31
Although b and 31b are formed, in order to give a sufficient fastening force to the hose and the like, the tongue piece 35, the concave portion 31a of the step portion 31 and the convex portion 31b are formed.
Each of them requires a certain width dimension, and there is a problem that there is a limit in narrowing the width of the strip 30 itself.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a clamp having a continuous fastening force in the circumferential direction and a simple structure.

[Means for Solving the Problems]

In the clamp according to the present invention, a band-shaped body having a stepped portion corresponding to the thickness in the middle portion and an ear portion for tightening near one end portion thereof is curved in an annular shape, and one end portion thereof is formed into the middle portion. While overlapping and fixing to the outer periphery, the other end is opposed to the vicinity of the step portion through the inside of the ear, and the ear is compressed in the circumferential direction,
In a clamp having a reduced circumferential length to obtain a fastening force, the other end edge is formed by inclining in one direction with respect to the width direction of the strip from one side edge in the width direction toward the other side edge. Then
Further, the stepped portion is formed so as to extend obliquely with respect to the width direction in conformity with the edge shape of the other end portion.

[Action]

According to the present invention, the step portion formed on the strip and the other end of the strip are formed so as to extend obliquely with respect to the width direction of the strip. Overlap in the width direction, the fastening force is continuous, and the strip itself can be made narrower.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to the drawings showing an embodiment thereof. FIG. 1 is a perspective view showing a clamp according to the present invention,
2 is a front view seen from a direction different from that of FIG. 1, FIG. 3 is a right side view of FIG. 2, and 10 in the figure shows a strip forming a clamp.

The band-shaped body 10 is made of metal, and a step portion 11 corresponding to the thickness of the band-shaped body 10 is formed in the middle in the longitudinal direction of the band-shaped body 10.
A guide edge 12 is provided along one side edge 11a in the width direction at a position closer to one end than that, and an ear portion is further provided to the one end side.
13, a protrusion 14 is formed on one side edge 11a in the width direction on the other end side of the step portion 11, and the step portion 1 is formed on the other terminal.
A slanted edge 15 is formed corresponding to 1.

The step portion 11 is formed so as to extend obliquely from the one side edge 11a of the band-shaped body 10 toward the other side edge 11b thereof by a required angle θ with respect to the width direction. The guide edge 12 is formed by standing upright along the side edge 11a of the strip 10 over a required length 1 by a width m at a right angle to the surface of the strip 10. The ears 13 are formed by curving the strip-shaped body 10 toward the surface side thereof in a U shape in a side view and projecting it. On the other hand, the projecting portion 14 is formed on the one side edge 11a of the strip-shaped body 10 in the same manner as the guide edge 12 by raising this so as to be orthogonal to the strip-shaped body 10. And the strip 10
The other end of the is formed with an inclined edge portion 15 formed so as to extend obliquely from one side edge 11a side in the width direction toward the other side edge 11b side.

Such a band-shaped body 10 is made to make one turn in a spiral shape so as to be overlapped with the one end located outside and the other end located inside, and the protrusion 14 is positioned corresponding to the guide edge 12. In addition, the other end passes through the inner side of the ear 13, and the other end faces the stepped portion 11 with a required gap and one end of the strip 10 is placed on the outer peripheral surface near the other end. It is welded.

In such a device of the present invention, for example, one end of the hose is externally fitted to the pipe while the clamp is fitted to the hose in advance, and the clamp is positioned on the outer periphery of the one end of the hose. In this state, crimp the ear 13. As a result, the other end moves toward the step 11 side, but at this time, the frictional force acting from the hose and the strip 10 on the inclined edge 15 of the other end is different in the width direction of the strip. Is the acting force F _{1 in} the circumferential direction of the strip 10 and the strip 10 as indicated by the arrows.
There is a possibility that the acting force F _{2 in} the width direction will act and the moving direction of the other end will shift in the width direction, but the protrusion 14 is locked to the guide edge 12 and is restrained from moving in the width direction. As a result, the inclined edge portion 15 can be smoothly moved in the circumferential direction.

As a result, the other end is guided through the gap between the outer peripheral surface of the hose and the strip 10 by the projection 14 and the guide edge 12, corresponding to the reduction in the circumferential length of the ear 12. By moving in the circumferential direction, the inclined edge portion 15 approaches the stepped portion 11 and overlaps the stepped portion 11 in the width direction.

In such a state, a continuous tightening force acts on the hose over the entire circumference in the circumferential direction, so that it is possible to reliably prevent leakage of oil and the like. Even if the rubber hose is highly elastic, the step 11 and the slanted edge 15
You won't get pinched in between.

FIG. 5 is a partial crushing side view showing a configuration in which the clamp according to the present invention is applied to a power steering apparatus for an automobile, in which 1 is a hydraulic control valve, 2 is a steering wheel, 3 is a rack shaft, 4 is a hydraulic cylinder. Is shown.

The hydraulic control valve 1 is accommodated in a housing 5 as a whole together with a rack portion (not shown) formed on a part of the rack shaft 3, and its input shaft is connected to the steering wheel 2 and is not shown in the drawing. The output shaft is meshed with the rack of the rack shaft 3 via a pinion. Both ends of the rack shaft 3 are connected to a not-illustrated mounting wheel, and a hydraulic cylinder 4 having the rack shaft 3 as a piston rod is formed in a part thereof.

The hydraulic cylinder 4 is configured by providing a piston 4a on the rack shaft 3 and coaxially arranging a cylinder 4b integral with the housing 5 on the outer periphery thereof, and the hydraulic chambers A and B on both sides of the piston 4a are respectively formed as described above. Steering is made to communicate with the port of the hydraulic control valve 1 opened in the peripheral wall of the housing 5, and to the right side by supplying the pressure oil into the hydraulic chamber A and to the left side by supplying the pressure oil into the hydraulic chamber B. It is designed to generate auxiliary power.

Then, at both ends of the rack shaft 3, beross 6, 7 are provided between the housing 5 and the cylinder 4b of the hydraulic cylinder 4 and watertightly by using the clamps 8, 9 according to the present invention as described above. ， Installed in an airtight state. In the embodiment, one end of the belt-shaped body is welded to the outer periphery near the other end. However, the welding is not limited to welding, and the engagement hole and the engagement projection may be used as in the prior art to cause any problem.

[Effect of device]

As described above, in the present invention, the step portion and the other end edge are formed obliquely so as to incline in one direction with respect to the width direction of the strip, so that the hose, bellows, etc. can be formed in the entire circumferential direction. Since a continuous fastening force can be applied over the circumference, leakage of oil, water, etc. can be reliably prevented, the width dimension of the belt-shaped body can be reduced, and even a highly elastic hose can be clamped. The present invention has excellent effects such as no possibility of being pinched.

[Brief description of drawings]

1 is a perspective view of a clamp according to the present invention, and FIG. 2 is a first view.
A front view seen from a direction different from the drawing, FIG. 3 is a right side view of FIG. 2, FIG. 4 is a perspective view seen from the same direction as FIG. 1, and FIG.
FIG. 6 is a partial crushing side view showing a usage state of a clamp according to the present invention, and FIGS. 6 and 7 are explanatory views showing a conventional clamp, respectively. 10 …… Band, 11 …… Step, 12 …… Guide edge, 13 ……
Ear, 14 ... Projection, 15 ... Slanted edge

Claims (1)

[Scope of utility model registration request] 1. A belt-shaped body having a stepped portion corresponding to the thickness in the middle portion and an ear portion for tightening near one end portion thereof is curved in an annular shape, and the one end portion is overlapped with the outer periphery of the middle portion. With the clamp fixed, the other end faces the vicinity of the step portion through the inside of the ear portion, compresses the ear portion in the circumferential direction, and shortens the circumferential length to obtain a fastening force, The edge of the other end is formed by inclining from one side edge in the width direction toward the other side edge in one direction with respect to the width direction of the strip, and the step portion conforms to the edge shape of the other end. The clamp is characterized in that it is formed so as to extend obliquely with respect to the width direction.