JPH088397Y2 - Pipe telescopic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a pipe expansion / contraction device that can be used for an expansion / contraction pipe such as a tripod for a camera.

(Prior Art) There are many uses of a pipe, such as a tripod for a camera, in which the pipe is stretched to an arbitrary length and fixed to the length. The conventional type of pipe that can be stretched in this way is to install pipes with different diameters, insert a small diameter pipe into a large diameter pipe, and reduce the outside diameter of the large diameter pipe with some structure. The inner small diameter pipe is gripped. This type of conventional gripping structure has a slit in the end of a large-diameter pipe, draws a small-diameter pipe from this large-diameter pipe to the desired length, and then attaches it to the outer peripheral part of the large-diameter pipe. By rotating the tightening ring described above, the portion of the large diameter pipe provided with the slit is tightened to hold the small diameter pipe. Further, as a structure different from this, there is a structure in which a lever is provided in place of the tightening ring and the large-diameter pipe is tightened by rotating the lever.

Among the above-mentioned conventional structures, the structure using a tightening ring is very troublesome because it is necessary to rotate the tightening ring for fixing after setting the total length of both pipes to be connected. Yes, and in some cases, the mechanism cannot be used due to the structure. Further, the lever-provided one has a problem that the lever is complicated to operate and, moreover, the bolt attached to the lever has a small diameter, so that it is easily worn.

Since the above-mentioned structure which has been generally used conventionally has such a defect, there are some which have been devised to solve this problem and have already filed a utility model registration application (actual application
1-93579). The general description of this application is that in this case, the pipes are not directly connected but are connected via a connector. That is, a connecting tool including a first tubular body for inserting a large-diameter pipe that becomes an outer side when connected and a second tubular body for inserting a small-diameter pipe that becomes an inner side is provided. An end of a large-diameter pipe is integrated with the first tubular body by bonding or the like, and a small-diameter pipe is inserted into the large-diameter pipe through a connecting tool. Then, the second tubular body that is reduced in diameter holds the small-diameter pipe by causing the second tubular body to bite into the first tubular body.

The structure for causing the second tubular body to bite into the first tubular body includes a taper that expands toward the opening on the side where the second tubular body is inserted on the inner circumference of the first tubular body. And a thin wall portion is provided on the side of the second tubular body that bites into the tapered portion, and when the second tubular body is pushed into the first tubular body, the thin wall portion shrinks at the tapered portion. The pipe having a small diameter is grasped by making the diameter and reducing the diameter. For this reason, a slit is provided in the thin portion to facilitate bending, and a friction material for gripping a small diameter pipe without slipping is attached to the inside of the thin portion.

(Problems to be solved by the invention) In the structure described above, the fixing operation is so simple that it can be performed with a so-called one-touch operation. Since the direction of the load applied to the large-diameter pipe side acts on the side that locks both pipes, extremely high safety and good operability can be obtained.
It can therefore be said to be a very good idea, but it has only one problem. Since the structure is such that the friction material is attached to the thin portion of the second tubular body, the workability of manufacturing this portion is extremely poor. That is, for example, if there are four slits, it is necessary to manually attach each of the four friction materials one by one, so that it takes a lot of time to work on this portion, There was a problem that it would be bent and stuck.

The present invention has been made in view of this point, and an object of the present invention is to provide a pipe expanding / contracting device which is remarkably improved in manufacturing workability by adding a part of the second cylindrical body to an improvement. .

(Means for Solving the Problem) As a means for solving the above problems, the present invention provides a connector 1 for connecting two pipes 6 and 16 having different outer diameters so as to be expandable and separable. The first cylinder 2 having the taper portion 9 therein and the second cylinder 3 having the thin portion 11 fitted to the taper portion 9 of the first cylinder 2 are formed, and the second cylinder A part of the body 3 where the thin portion 11 is fitted into the tapered portion 9 of the first tubular body 2 is formed of a friction material.

(Operation) If the connecting tool 1 is configured as described above, the portion of the first tubular body 2 of the connecting tool 1 is held by hand, and the first tubular body 2 is held.
If the second tubular body 3 is pulled with respect to the thin tubular portion of the second tubular body 3,
Since 11 is separated from the taper portion 9 of the first tubular body 2, the small-diameter pipe 16 is pushed into the second tubular body 3 in this state. Then, depending on the degree of pushing of the small diameter pipe 16, the large diameter pipe 6
When the second cylinder 3 is pushed into the first cylinder 2 when the total length of the second cylinder 3 reaches a predetermined value, the second cylinder 3 is formed by the friction material of the second cylinder 3. The thin portion 11 is fitted into the tapered portion 9 of the first cylindrical body 2 to reduce its diameter. Due to this diameter reduction, the small diameter pipe 16 is locked to the large diameter pipe 6. When the small-diameter pipe 16 is pulled out from the large-diameter pipe 6 by unlocking, the second tubular body 3 may be pulled out from the first tubular body 2 as described above.

(Embodiment) Next, an embodiment of a pipe expansion / contraction device according to the present invention will be described with reference to the drawings. Reference numeral 1 denotes a connecting tool, which is a first tubular body 2
And the second cylindrical body 3. First
The cylindrical body 2 has a step portion 4 formed on the inner periphery of the lower portion thereof, and is integrally attached with a large-diameter pipe 6 which is inserted from the opening portion 5 and comes into contact with the cut portion 4. As a means for integration, it is preferable to apply an adhesive to the outer periphery of the large-diameter pipe 6 when inserting the large-diameter pipe 6, and to bond with this adhesive. The first tubular body 2 is made of a hard synthetic resin, and an annular groove 8 is formed immediately inside the opening 7 on the side opposite to the opening 5. Since the first tubular body 2 is made of synthetic resin and the position of the thin groove 8 is just inside the opening 7, a large force for opening the opening 7 is provided. When actuated, the opening 7 will temporarily open with a small size. A portion of the first tubular body 2 inside the concave groove 8 is formed as a tapered portion 9 that widens on the opening 7 side.

The second tubular body 3 is formed of a main body portion 10 and a thin wall portion 11 integrally connected to the main body portion 10. The main body 10 is made of a hard synthetic resin like the first tubular body 2, and a step portion 13 is formed immediately inside the opening 12 at the lower end in the figure, and a thin wall inserted through the opening 12 is formed. It is adapted to receive the upper end of the part 11. A ridge 14 whose surface is chamfered is provided on the outer periphery of the opening 12 so that the ridge 14 engages with the concave groove 8 of the first cylindrical body 2 described above. In this case, the length of the groove 8 is set to be several times the length (thickness) of the ridge 14 so that the ridge 14 can move in the groove 8. By moving in this manner, the thin portion 11 of the second tubular body 3 is fitted into and released from the tapered portion 9 of the first tubular body 2. In addition, the upper opening 15 in the drawing of the second tubular body 3
Is slightly larger than the outer diameter of the small-diameter pipe 16 so that the small-diameter pipe 16 can be inserted.

The thin portion 11 forming a part of the second tubular body 3 is formed of a friction material such as rubber with cloth. The overall shape of the thin portion 9 is a tapered shape in which the lower portion in the drawing is reduced in diameter,
The dimensions of this outer peripheral portion are adapted to match the tapered portion 9 of the first cylindrical body 2. The thin portion 11 is provided with a plurality of slits 17 in the axial direction, and when the outer peripheral portion is fitted into the taper portion 9 of the first cylindrical body 2, the slits 17 effectively reduce the diameter. As a result, the small-diameter pipe 16 is easily gripped.

Next, a method of expanding and contracting a pipe using the connecting tool 1 having the above configuration will be described. First, the single state in which the pipe is not inserted into the connector 1 will be described. The first cylinder 2 is in a posture in which the opening 7 faces upward and the protrusion 14 is in a posture in which the pipe 14 is located below, as shown in the figure. The second cylindrical body 3 is placed on top of it. Then, when a large force is momentarily applied from the upper end of the second cylindrical body 3 with a hammer or the like, the opening 7 of the first cylindrical body 2 moves to the second
The ridge 14 is pushed open by the ridge 14 of the cylindrical body 3 of
Fit inside. The connector 1 when not used for connecting pipes is stored in this state.

When the small-diameter pipe 16 is inserted into the large-diameter pipe 6, the portion of the first tubular body 2 of the connecting tool 1 is held by hand, and the second tubular body is attached to the first tubular body 2. Just pull the body 3. In this way, when the second tubular body 3 is pulled with respect to the first tubular body 2, the thin portion 11 of the second tubular body 3 separates from the tapered portion 9 of the first tubular body 2, A small-diameter pipe 16 is pushed into the second tubular body 3. Then, the full length dimension with the large diameter pipe 6 is determined by the indentation degree of the small diameter pipe 16, and when the full length dimension reaches a predetermined value, the small diameter pipe 16
When the second tubular body 3 is pushed into the first tubular body 2 together with it, the thin-walled portion 11 of the second tubular body 3 formed of a friction material is fitted to the tapered portion 9 of the first tubular body 2. And reduce the diameter. Due to this reduced diameter, the small-diameter pipe 16 is gripped by the second cylindrical body 3, so that it is locked with respect to the large-diameter pipe 6. When the small-diameter pipe 16 is pulled out from the large-diameter pipe 6 by unlocking, the second tubular body 3 may be pulled out from the first tubular body 2 as described above.

(Effects of the Invention) As described above, the present invention provides a connector for connecting two pipes having different outer diameters in a stretchable and separable manner with a first tubular body having a tapered portion inside thereof. A second tubular body having a thin wall portion that fits into the tapered portion of the first tubular body, and a thin wall that fits into the tapered portion of the first tubular body with a portion of the second tubular body Since the pipe expansion and contraction device has a structure in which the parts are formed of friction material,
By simply pushing in or pulling out the tubular body, the pipe connection and the locking / unlocking in the connected state can be performed very easily and quickly. The thin wall portion of the second cylinder in the mechanism for this purpose is manufactured by a member different from other parts, and this member is easily coupled. Therefore, the manufacturing work thereof is different from that of the above-mentioned prior art. The property can be significantly improved.

[Brief description of drawings]

 The drawing is a cross-sectional view of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Connection tool 2 ... 1st cylinder 3 ... 2nd cylinder 6 ... Large diameter pipe 9 ... Tapered part 10 ... Main body 11 ... Thin part 16 ... Small diameter pipe 17 ... Slit

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A connector for connecting two pipes having different outer diameters to each other in a stretchable and separable manner, in a first tubular body having a tapered portion inside and a tapered portion of the first tubular body. A second tubular body having a thin-walled portion to be fitted therein, and a portion of the second tubular body to be fitted into the tapered portion of the first tubular body is formed of a friction material. A device for expanding and contracting pipes that is characterized.