JPH0736236Y2 - Pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pipe connector used for various purposes.

(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 fixing structure of the pipe to be stretched in this way has a structure in which a slit is formed in the end portion of the outer pipe, the inner pipe is drawn to a desired length, and then the tightening ring is rotated to tighten the outer pipe. It is common. Further, as a structure different from this, there is a structure in which a lever is provided and the lever is rotated to replace the rotation of the tightening ring.

(Problems to be solved by the invention) Of the above-mentioned conventional structures that use a tightening ring, it is necessary to rotate the tightening ring after setting the length of the pipe, which is very troublesome. It is complicated, and in some cases, there are applications where the structure cannot be used. 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.

The present invention has been made in view of this point, and makes the operation so-called simple one-touch operation to give quickness to the expansion and contraction operation of the pipe, and the load direction applied to the inner pipe pulled out is to the lock side. It is intended to provide a pipe fitting that will work.

(Means for Solving the Problem) According to the present invention, an opening 4a for inserting a large-diameter pipe 12 and a step 7 for receiving the pipe 12 are formed at one end, and a small-diameter pipe 13 is inserted at the other end. The opening 4b, the tapered portion 5 that expands toward the opening 4b, and the first cylindrical body 1 in which the annular recess 6 having an arbitrary length is formed on the opening 4b side of the tapered portion 5, and the tapered portion 5. A thin-walled portion 9 fitted to the inside from the inside and provided with an axial slit 8 in a part thereof and a friction material 11 adhered to the inside thereof, and an annular protrusion 10 slidably engaged with the annular recess 6 from the inside. It is a pipe connecting tool 3 including a second cylindrical body 2 provided with.

(Operation) With such a configuration, one end is inserted into the large-diameter pipe 12 from the opening 4a of the first cylinder 1 until it hits the step 7, and is connected to the second cylinder 2 side. After inserting and pulling out the small-diameter pipe 13 that is mostly contained in the large-diameter pipe 12, the friction material 11 moves it together with the small-diameter pipe 13 by pushing it back a small amount in the direction of expansion and contraction. The thin portion 9 of the second tubular body 2 is the tapered portion 5 of the first tubular body 1.
The two pipes 12 and 13 are fixed in that state by biting into.

(Embodiment) Next, an embodiment of a pipe expansion / contraction device according to the present invention will be described with reference to the drawings. In FIG. 1 with a part cut away and in FIG. 2 showing its structure in cross section, 1 is a first cylinder and 2 is a second cylinder. These first and second cylinders
Both 1 and 2 are made of resin, and are integrally connected to each other to form the connector 3, as described later. The first cylindrical body 1 has, inside thereof, a tapered portion 5 that widens toward the opening 4b.
And an annular recess 6 located on the opening 4b side of the tapered portion 5 and having an arbitrary length (height direction in the drawing). The portion of the first cylindrical body 1 opposite to the opening 4b is formed in the opening 4a, and the step 27 is formed in the back of the opening 4a. It is designed to be insert-coupled.

A plurality of slits 8 are provided in the second tubular body 2, a thin portion 9 that fits into the tapered portion 5 of the first tubular body 1 from the inside, and an annular recess of the first tubular body 1. 6 is provided with an annular projection 10 slidably engaged from the inside. Thin part 9
A friction material 11 such as cloth-filled rubber is attached to the inside of the. As described above, the second tubular body 2 constitutes the connector 3 together with the first tubular body 1. And these first and second cylinders
The fact that 1 and 2 are integrated even when not in use can be said to be a major feature of the present invention. As means for integrally connecting, the first and second cylindrical bodies 1 and 2 each having the structure described above are prepared, and the first cylindrical body 1
It suffices to heat the portion in the vicinity of the opening 4b to an appropriate temperature and press fit the second cylindrical body 2 in the heated state.

Reference numeral 12 indicates a large diameter pipe, and reference numeral 13 indicates a small diameter pipe. As mentioned above, this large diameter pipe
12 is inserted into the step portion 7 of the first tubular body 1 and is joined to the first tubular body 1 with an adhesive or the like. The outer diameter of the small-diameter pipe 13 is slightly smaller than the inner diameter of the large-diameter pipe 12, so that the slidable state is maintained when fitted. This small diameter pipe 13 is a large diameter pipe.
It will be inserted from the second cylindrical body 2 side into the connection tool 3 after coupling 12 together.

The expansion / contraction device for a pipe thus constructed is used as follows. That is, as described above, the end portion of the large-diameter pipe 12 is inserted and coupled to the first tubular body 1 side of the connecting tool 3 that is integrally coupled, and the second tubular body 2 in that state has a small diameter. Insert the pipe 13. At this time, the second tubular body 2 of the connector 3 is set so that the annular projection 10 is most pulled in the annular recess 6 of the first tubular body 1 (the state opposite to the most inserted state shown in the drawing). Keep it. This is because the degree of biting of the thin portion 9 into the tapered portion 5 is reduced in this state. Therefore, the thin portion 9 and the friction material 11 attached to the inside thereof do not hinder the insertion of the small-diameter pipe 13.

After inserting the small-diameter pipe 13 in this way, the second tubular body 2 is moved to the first tubular body 1 side so that the annular projection 10 is located at the innermost position in the annular recess 6 as shown in the drawing. (Or even before this), the thin portion 9 comes into pressure contact with the tapered portion 5 from the inside, and as a result, the thin portion 9 grips the small diameter pipe 13 via the friction material 11. Become. This allows the small diameter pipe 13 to
Will be position locked against. This connection tool 3
When the pipes 12 and 13 to be connected are used in an upright state, the load acting on the second tubular body 2 due to the weight of the small-diameter pipe 13 causes the thin portion 9 to taper the first tubular body 1. Since it acts in the lock direction in which it is pressed against the portion 5, it is extremely safe in use. To release the lock, the first tubular body 1 may be held and the second tubular body 2 may be pulled in the direction away from the first tubular body 2 (upward direction in the drawing). This is because the gripping force of the thin portion 9 becomes small in this way.

(Effects of the Invention) Since the present invention is a pipe connecting tool configured as described above, it does not require the trouble of rotating the tightening ring unlike the conventional one, and it does not break like the one provided with a lever. There is no problem of being easy. Since it can be securely fixed with a so-called one-touch, usability is significantly improved. Since the direction in which the load is applied is the lock direction, extremely high safety can be obtained when the heavy pipe in the extended state is connected and used. Since the first tubular body and the second tubular body are integrally coupled, one is not lost and cannot be used. Since the first cylinder and the second cylinder have a structure in which the tapered portion formed on the first cylinder is engaged with the thin portion of the second cylinder to obtain frictional force, It is possible to manufacture a pipe expansion / contraction device that can be manufactured with uniform diameter dimensions and without protruding parts, and that has excellent handleability. Furthermore, since the structure is simple and no fatigue generating parts such as springs are required, there is an advantage that it can be used for a long period of time.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a pipe expanding / contracting device according to the present invention by cutting away, and FIG. 2 is a sectional view showing an internal structure of the device of FIG. 1 …… First cylinder 2 …… Second cylinder 3 …… Connector 4a …… Opening 4b …… Opening 5 …… Tapering 6 …… Annular recess 7 …… Step 8 …… Slit 9 ... Thin-walled part 10 ... annular protrusion 11 ... friction part 12 ... large-diameter pipe 13 ... small-diameter pipe

Claims (1)

[Scope of utility model registration request] 1. An opening for inserting a large-diameter pipe and a step portion for receiving the pipe are formed at one end, and an opening for inserting a small-diameter pipe at the other end and a taper expanding toward the opening. And a first cylindrical body having an annular recess of arbitrary length on the side of the opening from the tapered portion, and the tapered portion fitted from the inside and provided with an axial slit in a part thereof and friction on the inside. A connector for a pipe, comprising a second tubular body provided with a thin portion having a material attached thereto and an annular projection slidably engaged with the annular recess from the inside.