JPS5930247Y2 - Telescopic double tube tightening device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a tightening device for a telescopic double pipe.

Traditionally, display stand columns and motsupu handles have been made of telescopic double tubes that can be adjusted in length freely, but the tensioning device used is one that uses the elastic force of a leaf spring, etc. many.

However, if the elastic force of the plate is strengthened, the friction increases, making it difficult for the tube to expand and contract smoothly.If the elastic force is weak, it can only be used within a limited range because it can expand and contract with a small amount of force. There wasn't.

This invention was made to eliminate the drawbacks of conventional systems such as above-ground systems, and consists of a nut fixed to the inner tube and an elastic ring fitted to the tapered surface of the core that is screwed into the nut. This provides a tightening structure for a telescopic double pipe, which is configured so that the inner pipe can be released and tightened with a touch of the hand.

Hereinafter, details of the present invention will be explained based on embodiments shown in the drawings.

The telescopic double tube shown in the figure by the reference numeral 1 includes an outer tube 2 formed into a cylindrical shape, and an inner tube 3 slidably fitted into the outer tube 2.
and has.

A guide tube 4 is fitted and fixed to one end of the outer tube 2.

The guide tube 4 is formed into a substantially cylindrical shape, and a large diameter portion 4a into which one end of the outer tube 2 is fitted is formed on the inner circumferential surface of one end thereof, as is clear from the sectional view of FIG. At the other end, a through hole 4b having approximately the same external shape as the outer tube 2 is formed, and the connecting portion between the two is a stepped portion 4c to which the edge of the outer tube 2 is locked.

A constricted portion 4d is formed on the outer peripheral surface of the guide tube 4 on the side of the through hole 4b, giving an elegant appearance.

A nut 5 is fitted and fixed to the inner end of the inner tube 3.

The nut 5 is formed into a stepped cylindrical shape as shown in FIG.
Then, the small diameter portion 5a is fitted and fixed into the inner tube 3.

The small diameter portion 5a has a stepped portion 5b having a wall thickness equal to that of the inner tube 3, and forms a large diameter portion 5c having an outer diameter that is similar to the outer diameter of the inner tube 3.

A tapered hole 5d whose diameter becomes smaller toward the inside is formed at the end of the nut 5 on the large diameter portion 5° side, and the internal force end of this tapered hole 5d is continuous with the female threaded portion 5e. Ori,
The other end of the female threaded portion 5e is continuous with a through hole 5f having an inner diameter equal to the thread diameter of the female threaded portion.

What is repelled by the reference numeral 6 is a core, and this core 6 has a cylindrical portion 6a at one end having an outer diameter approximately equal to the outer shape of the inner tube 3, and an outer end of this cylindrical portion 6a. Projections 6 all around
b is formed, and the cylindrical portion 6a including the protrusion 6b is formed.
A notch 6c is formed along the axial direction over a predetermined distance from the external force end, and the cylindrical portion 6a is divided into a plurality of tongues 6d by these plurality of notches 6°.

Therefore, the tips of these tongue pieces 6d are structured to be able to freely elastically deform inward.

The outer diameter of the protrusion 6b is slightly larger than the inner diameter of the outer tube 2, and as shown in FIG. is in elastic contact with the inner peripheral surface of the outer tube 2.

The cylindrical portion 6a is continuous with a taper portion 6e which has a smaller diameter as it extends outward, and the tip of this taper portion 6o is formed over a length approximately equal to the female thread portion 6° of the nut 5. There is a button continuous to the male threaded part 6f, and two buttons are arranged parallel to the axial direction of the core 6 at the tip of the male threaded part 6f.
6g piece of protrusion.

6g are formed continuously.

These protrusions weigh 6g. 6 are formed continuously.

These protrusions weigh 6g. The diameter of 6 is approximately equal to the root diameter of the male threaded portion 6f, and the amount of protrusion thereof is approximately twice the length of the through hole 5f of the nut 5.

And these protrusions 6g, 6. The distal ends of the buttons are formed with hemispherical bulges 6h that bulge outward, and the base ends of these bulges 6h are perpendicular to the projections 6g.

The outer diameter of these bulging portions 6h is approximately equal to the thread diameter of the male threaded portion 6f.

An elastic ring γ is fitted into the tapered portion 6e of the core 6 having the above structure.

As shown in FIG. 5, the elastic ring 7 has a substantially cylindrical shape and is molded from a material having sufficient elasticity, such as synthetic resin.

The width of the elastic ring 7 is approximately equal to the length of the tapered portion 6e, and a portion of the elastic ring 7 is divided by forming it along the axial direction of the notch portion 7a, and the diameter becomes smaller toward the inside. is given elasticity.

Further, the inner diameter of the elastic ring 7 is equal to the outer diameter of the approximately central portion of the tapered portion 6°.

1, the outer diameter of the elastic ring 7 is approximately equal to the inner diameter of the outer tube 2.

The core 6 is screwed into the nut 5 while being fitted into the tapered portion 68 of the elastic ring I.

At the time of this screwing, the outer diameter of the bulging portion 6h//'i is almost the same as the thread diameter of the male threaded portion 6f, so when it is fitted into the female threaded portion 5e from the tapered hole 5d, the protrusion 6g, 6
g are fitted together while being elastically deformed, and the male threaded portion 6f advances as it is screwed into the female threaded portion 5e, and eventually the through hole 5
When it passes through f, it expands outward due to the elasticity of the protrusion 68, and the proximal end of the bulging portion 6h is hooked to the outside of the nut 5f, making it impossible to remove it.

Next, a method of using this embodiment configured as above will be explained.

If the inner tube 3 is to be cut into the outer tube 2 and fitted without being separated, the core 6 is screwed into the nut 5, and the protrusion 6 at the tip of the core is inserted.
．． The bulging portions 611, 611 at the tip of the nut 6g are buttoned to the tip side of the through hole 5f of the nut 5, so that they are hooked to the edge of the nut 5.

In this state, the elastic ring 7 is only in contact with the edge of the dog diameter portion 5c of the nut 50.

In this state, the tongue piece 6d of the cylindrical portion 6a of the core 60 is bent inward and press-fitted into the outer tube 2.

After press-fitting, the protrusion 6b formed at the tip of the tongue piece 6d
Due to the elasticity of the tongue piece 6d, the tongue piece 6d contacts the inner circumferential surface of the outer tube 2 with a predetermined frictional force, and the elastic ring T comes into close contact with the inner circumferential surface of the outer tube 2.

In this state, if enough force is applied to the inner tube 3 to overcome the frictional force between the protrusion 6b or the elastic ring I and the inner peripheral surface of the outer tube 2, the inner tube 3 can be freely expanded and contracted.

In this way, when it is desired to fix the inner tube 3 in a state in which it is expanded and contracted to a desired position, the outer tube 2 and the inner tube 3 are rotated relative to each other, and the core 6 is screwed into the nut 5. Just do it.

When core 6 begins to spiral toward nut 5, nut 5
The end edge on the large diameter portion 5c side approaches the base of the tapered portion of the core 6 at 6°, and presses the elastic ring 7 toward the large diameter portion of the tapered portion at 6°.

At this time, the elastic ring 7 is initially in a state in which the inner side of the edge on the cylindrical portion 6a side is in contact with the tapered portion 6° as shown in FIG. 2, but as it is pressed by the nut 5, the taper It is pushed into a space having a substantially triangular cross section between the portion 68 and the inner peripheral surface of the outer tube 2, and is elastically deformed along the space.
The inner circumferential surface of the elastic ring 7 comes into complete contact with the outer circumferential surface of the tapered portion 6e, and as shown in cross section in FIG. The portion 6e is elastically deformed so that it is thinner on the base side and thicker on the opposite side.

In this state, the outer circumferential surface of the elastic ring 7 strongly presses the inner circumferential surface of the outer tube 2, and the inner circumferential surface strongly presses the outer circumferential surface of the tapered portion 6e, and the outer circumferential surface of the tapered portion 6e and the outer tube A wedge is driven between the core 6 and the inner peripheral surface of the core 6.
Therefore, the inner tube 3 and the outer tube 2 are completely fixed with a large frictional force.

In this state, even if a large external force is applied to the inner tube 3 or outer tube 2, they will not expand or contract.

On the other hand, if you want to expand or contract the inner tube 3 again, simply rotate the inner tube 3 and the outer tube 2 relative to each other in the direction in which the core 6 moves away from the nut 5 from the state shown in FIG. In order to release the pressing force on the elastic ring 7, the elastic ring I tries to restore itself by its own elasticity.

This restoring force occurs in the direction in which the diameter of the elastic ring 7 decreases and in the thickness direction in which the elastic ring 7 tries to return to its original thickness, and this force acts on the outer circumferential surface of the tapered portion 6e, so that the core A component force is generated in the direction of the axial force of the outer tube 2, and the elastic ring T obtains a force that moves in the direction of the smaller diameter of the tapered portion 6o.As shown in FIG. It returns to its original state where it can't control its power.

In this way, the inner tube 3 can be freely expanded and contracted and can be fixed at any position with a single touch.

As is clear from the above description, according to the present invention, an elastic ring having a substantially C-shaped cross section is provided on the tapered part of the core that is aligned and screwed into the nut fixed to the tip of the inner tube. Because they have a fitted structure, simply rotating the inner tube and outer tube relative to each other presses the elastic ring to fill the space between the tapered part of the core and the inner circumferential surface of the outer tube. It can be press-fitted while being elastically deformed as a wedge to completely fix the space between the outer tube and the inner tube.

If the inner tube and outer tube are rotated in opposite directions when the tightened state is released, this operation can be performed extremely easily with one touch.

Further, the structure is extremely simple and easy to manufacture, and there are excellent effects such as no failures or the like.

[Brief explanation of drawings]

The figures are for explaining one embodiment of the present invention, and FIG. 1 is an enlarged perspective view of the main part, and FIGS. 2 and 3 are partially enlarged lines taken along the line AA of FIG. 4 is a sectional view taken along line BB in FIG. 3, FIG. 5 is a perspective view of the core and elastic ring, and FIG. 6 is a perspective view of the nut. 1... Telescopic double tube, 2... Outer tube, 3... Inner tube, 5
... Nut, 6... Core, 6a... Cylindrical part, 6e
...Chi+part, 6f...male thread part, 6g...protruding piece, 6h...bulging part, 7...elastic ring.

Claims (1)

[Scope of utility model registration request] The inner end of the inner tube 3 is pressed by pressing a button on the tightening device of the telescopic double tube consisting of an outer tube 2 formed in a cylindrical shape and an inner tube 3 that is slidably fitted into the outer tube 2. A nut 5 is fixed to the nut 5, a core 6 is attached to the nut 5, and an elastic ring 7 is fitted on the outside of the core 6. The nut 5 has a tapered tip at its tip. This tapered hole 5 has a hole 5d.
The inner end of d is continuous with the female threaded portion 5e, and the other end of the female threaded portion is opened as a through hole 5f.The core 6 has a cylindrical portion 6a at its base, and this cylindrical portion 6a The tip of is released, and a protrusion 6b is formed on the outer peripheral surface of this open end with an outer diameter slightly larger than the inner diameter of the outer tube 2, and the cylindrical portion 6a including the protrusion 6b is Notches 6° are formed along the axial direction and at equal intervals in the circumferential direction over a predetermined distance, and the other end of this cylindrical portion 6a becomes smaller in diameter as it moves away from the cylindrical portion. Taper part 6e
This tapered portion 6° is continuous with the male threaded portion 6f that is screwed into the female threaded portion 5e of the nut 5, and
At the tip of the protrusion 6., there are two projecting pieces 6. having a diameter approximately equal to the root diameter of the male threaded portion 6f. ．． 6° is provided, and these two protruding pieces'
6g, a hemispherical bulge 6 extending outward from the tip of 6g
h, and the diameter of these bulging portions 6h is approximately equal to the thread diameter of the male threaded portion 6f, and the proximal end thereof has a protrusion 6g.
The elastic ring 7 is formed in a cylindrical shape, and a notch 7a is formed along the axial direction in a part of the elastic ring 7, and the inner diameter of the notch 7a is 6 degrees in the tapered part of the core 6. The outer diameter of the core 6 is approximately equal to the diameter of the central portion in the axial direction, and the outer diameter thereof is approximately equal to the inner diameter of the outer tube 2. A tightening device for a telescopic double pipe, characterized in that it is screwed onto the nut 5 via a male threaded portion 6f with an elastic ring I partially fitted at an angle of 6 degrees.