JP3315021B2 - Connecting rod connection rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for a connecting rod, and more particularly, to connecting a connecting rod as a nominal line in the middle of a pipe when laying a cable in an underground pipe. For connecting devices for

[0002]

2. Description of the Related Art In general, when a cable is laid in an underground pipeline, a cable rod as a reference line is inserted into the pipeline, and a cable is attached to a distal end or a base end of the cable rod. 2. Description of the Related Art There is known a method of extending a cable by pulling out a wire rod from one of them. In addition, when the pipeline is relatively long or bent, frictional resistance and the like become large and it becomes difficult to insert or push in the wire rod. It has been practiced to insert rods for use and to connect them in the middle of a pipe and then pull them out from one side. The connection of the connecting rods is usually performed by a connecting tool or a joint fitting provided at the end of each connecting rod. As a conventional connection or joint fitting,
It is known that a wire material such as an iron wire is bent into a hook shape. When the wires come into contact with each other from the opposite direction, the hook portions are hooked to each other so that a connection is made. Incidentally, as such a connection tool, there are those disclosed in Japanese Utility Model Publication No. 45-11736 and Japanese Utility Model Publication No. 3-43795,
In addition, in those disclosed in Japanese Utility Model Publication No. 4-6865, Japanese Utility Model Publication No. 56-164612 and Japanese Utility Model Publication No. 61-165019,
A hook-shaped member is provided on one of the connecting rods, and a ring-shaped member is provided on the other connecting rod, so that they are hooked to each other.

[0003]

However, in such a conventional connecting device, since the wire material is largely bulged in the radial direction with respect to the axial direction of the connecting rod, the existing connecting device is particularly provided in the pipe. When a cable is accommodated and inserted into the gap, insertion is extremely difficult because of the size and the fact that the wire is caught by the existing cable. In particular, when the size of the pipe and the existing cable are similar, the insertion is often impossible because the gap is a very narrow gap with a crescent cross section.

Therefore, the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a connecting device for a wire rod which enables insertion even when a gap in a pipeline is narrow. To provide.

[0005]

In order to achieve the above object, the present invention according to claim 1 is for connecting two connecting rods inserted respectively from both ends of a pipeline to each other. The connecting tool of the above, at the tip of both of the wire rods
A plate-shaped head with a circular cross section attached and one of the heads
A male member provided at the tip of the head and the other
A female member provided at the tip of the head;
Material is a cross-sectional circle separated in the thickness direction of the one head
An arc-shaped holding plate and a hooking plate, and
Plural pieces folded in the gap between the holding plate and the hook plate
And the female member is formed in an arc shape in cross section.
A frame is formed at the tip to catch the claw.
It consists of an opening plate.

The present invention according to claim 2 is based on claim 1.
In the present invention described above, the holding plate and the hook plate
The total thickness of the male member is equal to the thickness of the one head
Things.

[0007]

According to the present invention, a cross section is formed at the time of insertion of a wire rod.
An arc-shaped head is inserted along the inner surface of the pipe,
And the frame on the other rod side
Parts are hooked, and the connection of the
Is done.

[0008]

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show a connecting tool for a connecting rod according to the present invention, in which (a) is a plan view, (b) is a front view,
(C) is a partial vertical side view. This connecting device has a pair of male and female.

FIG. 1 shows a male member. The male member 1 is attached to a distal end portion of a wire rod 2a via a head 3 for pushing. As the rod 2a, a wire material such as split bamboo, polyethylene pipe, iron wire, glass fiber, or the like is used, which is flexible so that it does not easily buckle and deform when pushed into a pipe. The head 3 is a molded product made of a metal such as aluminum or iron, a resin, a plastic, or the like. The head 2 is fitted with a rod 2a in a mounting hole 4 at a base end thereof, and is detachably attached with an appropriate fastener. . The head 3 is formed in a substantially rectangular plate shape having a relatively large area, and its corners and sides are rounded in a round shape. In particular, the corners on the distal side are greatly rounded as compared with the corners on the proximal side.
The male member 1 attached to the tip of the head 3 is mainly composed of three plate members, that is, metal plates.
That is, the male member 1 is composed of a mounting plate 6 fixed to the distal end of the head 3, a pressing plate 7 welded and fixed to the upper surface of the mounting plate 6, and a hook plate 8 fixed to the lower surface of the mounting plate 6 by welding. Be composed. An embedding bolt 9 is welded to the mounting plate 6, and the embedding bolt 9 is fixed at the same time as the molding of the head 3 or embedded in the screw hole. Reference numeral 10 denotes a hole.

The holding plate 7 and the hooking plate 8 have their base ends fixed to the mounting plate 6 and are bent into a crank shape separated from each other and extend to the distal end side. In particular, a claw portion 11 extending longer than the holding plate 7 is formed at the distal end of the hooking plate 8. The claw portion 11 is folded back to the base end side and is housed in the gap 12 between the holding plate 7 and the hooking member. Form.
In this embodiment, the claw portions 11 are formed in a triangular shape and provided at equal intervals in the width direction. In addition, the length of the holding plate 7 and the length of the hooking plate 8 become equal by folding the claw portion 11.

In particular, the head 3, the mounting plate 6, the holding plate 7, and the hooking plate 8 are curved such that a cross section orthogonal to the longitudinal direction of the head 3 has an arc shape. Here, the longitudinal direction of the head 3 corresponds to the insertion direction of the rod 2a into the pipe. The bending direction of the member is a bending direction such that a central portion in the width direction is lifted upward. A detailed description of the radius of curvature and the like will be given later.

In the female connector shown in FIG. 2, a female member 20 is attached to the tip of another rod 2b via a head 3. Since the rod 2 and the head 3 have the same configuration as described above, only the female member 20 will be described. Here, the female member 20 is composed of a single opening plate 21 made of a metal plate. Similarly to the mounting plate 6, the opening plate 21 has an embedded bolt 22 welded to the base end thereof embedded in the head 3 and fixed. A hole 23 is also provided. The opening plate 21 is formed in a rectangular shape, and an opening 25 is formed on the tip end side thereof except for a U-shaped frame portion 24. The width a of the frame portion 24 is equal to the interval b at the base end of the claw portion 11 formed on the male member 1. The frame portion 24 forms a locking member that is hooked on the claw portion 11 of the male member 1. Further, similarly to the above, the aperture plate 21 is also curved such that a cross section orthogonal to the longitudinal direction of the head 3 has an arc shape. The male and female members 1 and 20 formed in this manner have the same overall length and width as L and W.

As for the insertion of the connecting rods 2a and 2b, as shown in FIG. 5, both ends of the underground conduit 30 are opened in a manhole or the like, and an existing cable 31 is accommodated therein. ing. Cable 31 is conduit 30
Therefore, a gap 32 with the cable 31 is formed at the upper part in the conduit 30. As shown in FIG. 4, the gap 32 is formed between the cable 31 and the conduit 30.
When the diameter is slightly smaller, a relatively narrow gap having a crescent cross section is obtained. Note that the cable 31 may be a CVT cable having no jacket as shown in these figures, or a CV cable having a jacket.
A cable or the like may be used. The broken line in FIG. 4 indicates the effective diameter of the cable without the jacket. And as shown in FIG.
In the gap 32, there is provided a rod 2 for a wire to which the male member 1 is attached.
“a” is inserted from one end of the conduit 30, and the wire rod 2 b to which the female member 20 is attached is inserted from the other end of the conduit 30.

FIG. 3 is a view of the head 3 when the rod 2a (or 2b) is inserted, as viewed from the proximal end side. As shown, the head 3 completely fits into the gap 32 above the cable 31. Head 3, which is curved, rounded radius R ₁ of the lower surface 3a is equal to the radius R ₂ of the cable 31 (external object), Earl radius R ₃ of the upper surface 3b is equal to the radius R ₄ of the conduit inner surface 33 Have been. The head 3 has a substantially uniform thickness t such that the upper surface 3b forms a predetermined gap (about 5 mm) with the pipe inner surface 33. From the figure, it can be seen that the side of the head 3 is rounded.

Similarly, referring to FIG. 1B, in the male member 1, the mounting plate 6, the holding plate 7, and the hooking plate 8 are all curved. The rounded radius R ₅ of the lower surface 8a of the hook plate 8 is equal to the radius R ₂ of the cable 31, rounded radius R ₆ of the upper surface 7a of the pressing plate 7 is equal to the radius R ₄ of the conduit inner surface 33, hooking The total thickness T formed by the plate 8 and the holding plate 7 is equal to the thickness t of the head 3. Therefore, the upper surface 7a, the lower surface 8a and the thickness T of the male member 1
Are formed equal to those of the head 3.

Referring to FIG. 2B, the female member 20
The radius R of the center of the thickness of the aperture plate 21
_7, a pressing plate 7 ares radius R ₅ of the lower surface 8a of the hook plate 8
Value the sum divided by two of the rounded radius R ₆ of the upper surface 7a, i.e. _{(R 5 + R 6) /} 2 = (R 2 + R 4) / 2 are.
The thicknesses of these plates 6, 7, 8, 21 are all equal.

The mounting plate 6 of the male member 1 and the female member 20
Are fixed at the center position of the thickness of the head 3, so that when the male member 1 and the female member 20 abut against each other from the opposite direction, the opening plate 21 of the female member 20 It enters the gap 12.

Therefore, when the connecting rods 2a, 2b are inserted from both ends of the conduit 30, the male and female members 1, 20 abut each other in the middle of the conduit 30, and the opening plate 21 of the female member 20 is opened. At the same time as entering the gap 12 of the male member 1,
The connection (joint) is achieved by hooking the claw portion 11 on 4.

Then, referring to FIG. 5, by pulling any one of the connecting rods (for example, 2a), tension is applied to the connecting portions 34 of the male and female members 1 and 20, and the connection between them is established. When the wire rod 2a is held and the wire rod 2a is pulled out, the other wire rod 2b is extended or wired over the entire length of the conduit 30. In this case, the rod for communication 2b
Laying of a new cable, for example, laying of an optical cable, a communication line or the like.

As described above, such a connector can be easily inserted even when the existing cable 31 is housed in the conduit 30 and the gap 32 is narrow. In particular, since the connecting member is formed from a curved plate-like member, frictional resistance and snagging with the inner surface 33 of the conduit and the outer peripheral surface of the cable 31 are reduced, and long-distance wiring is possible by sliding on the surface. Become. In the case of the conventional wire, only the bulging portion is concentrated and abutted, so that the frictional resistance is large.
Long-distance lines are not possible due to catching with projections, steps, dust and the like in the inside.

Further, since the radius of curvature due to the curvature of the male and female members 1 and 20 is set as described above, the contact between the inner surface 33 of the conduit and the outer peripheral surface of the cable 31 at the time of the passage is uniform. Thus, frictional resistance can be reduced, and the length of the wire rod 2 can be increased.

The male and female members 1 and 20 are connected to the conduit 30.
In order to insert the cable into the gap 32 with the cable 31 inside, the radius of each radius should satisfy the following conditions.

The radius R ₅ of the lower surface 8 a of the hooking plate 8: R ₂ ≦ R ₅ ≦ R ₄ −T The radius R ₆ of the upper surface 7 a of the holding plate 7: R ₂ + T ≦ R ₆ ≦ R ₄ The radius R ₇ formed by the center of the thickness: R ₂ ≦ R ₇ ≦ R ₄ Accordingly, the values R ₅ , R ₆ , and R ₇ of the radius radii can be appropriately changed within this range. The minimum value of the total thickness T formed by the hooking plate 8 and the holding plate 7 is 5 mm in order to secure a certain gap 12.

As an advantage of the male member 1, the provision of the holding plate 7 above the hooking plate 8 prevents the claw 11 hooked on the opening 25 from being turned back by tension, and the opening plate 21 or The point that the female member 20 can be prevented from coming off is raised. Further, the presser plate 7 prevents the claw portion 11 from directly contacting and digging into the inner surface 33 of the conduit, and at the same time plays a role of reducing the frictional resistance due to the surface contact itself.

A relatively large pressing head 3 is provided between the male and female members 1 and 20 and the wire rods 2a and 2b, so that the members 1 and 20 are firmly attached. And the frictional resistance during insertion can be greatly reduced. In addition, the head 3 guides the male member 1 and the female member 20 to a predetermined position so that the male member 1 and the female member 20 do not fall into the gaps 32 on both sides in the conduit 30 so that the connection is reliably performed. By rounding the corners and sides of the head 3, it is also possible to easily get over a projection, a step, or the like in the conduit 30. This is even more pronounced because the corners are more rounded than the proximal corners.
As described above, insertion and connection of the connecting rod are further facilitated.

Further, a plurality of claws 11 are formed on the male member 1, and the minimum distance b between them is set to the frame portion 24 of the opening plate 21.
Is set to be equal to the width a, so that any one of the claws 11 can always be hooked when they abut, and at the same time, the frame portion 24 can be inserted deepest between the claws 11. The hooks 11 are triangular and easy to hook, but this can be changed to any shape.

In addition, the present invention is capable of various modified embodiments.

[0030]

The present invention exhibits the following excellent effects.

(1) Insertion is possible even when the gap in the pipeline is narrow.

(2) The cable can be inserted into the gap between the cable and the existing cable in the pipeline .

[Brief description of the drawings]

FIG. 1 shows an embodiment of a male fitting according to the invention,
(A) is a plan view, (b) is a front view, and (c) is a partial longitudinal side view.

FIG. 2 shows an embodiment of a female connector according to the present invention,
(A) is a plan view, (b) is a front view, and (c) is a partial longitudinal side view.

FIG. 3 is a diagram showing an inserted state of a wire rod.

FIG. 4 is a view showing a pipeline in which an existing cable is accommodated.

FIG. 5 is a view showing a connection state of a wire rod.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Male member (connector) 2a, 2b Connecting rod 8 Hook plate (plate-like member) 11 Claw part (hook member) 20 Female member (connector) 21 Opening plate (plate-like member) 24 Frame part (hook) Stop member) 30 Pipeline 31 Existing cable 32 Gap

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiro Nakagawa 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture Hidaka Works, Hitachi, Ltd. (56) References JP-A-6-284541 (JP, A) Actually open sho 61-156417 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G 1/08

Claims (2)

(57) [Claims] 1. Two pipes respectively inserted from both ends of a pipe
A connecting tool for connecting the connecting rods to each other, and attached to the distal end portions of both the connecting rods.
A plate-shaped head having an arc-shaped cross section and a tip of one of the heads
A male member provided at the end, and a tip of the other head
And the male member is separated in the thickness direction of the one head.
Presser plate and hook plate having an arcuate cross section, and a tip of the hook plate
Is folded back into the gap between the holding plate and the hook plate
The female member is formed in an arcuate cross-section , and the claw portion is formed at the distal end.
A connecting member for a wire rod, comprising an opening plate formed with a frame portion for hooking the wire. 2. The male member formed by the holding plate and the hook plate.
2. The apparatus according to claim 1, wherein a total thickness of the member is equal to a thickness of the one head.
A connecting tool for the rod for wiring described .