JPH0631442Y2 - Tension member fixture - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a fixing member for a tension member used in an optical fiber cord or a connecting portion between optical fiber cables.

[Prior Art] Optical fiber cords and optical fiber cables have a tension member built therein in order to obtain their tensile strength. The tension member is made of steel wire, steel stranded wire, FRP, Kevlar braid, etc., and at the connection part of the optical fiber cord and optical fiber cable, both optical fiber cords to be connected, each optical fiber of the optical fiber cable Before and after the connection, each tension member is connected to the inside of the connection box by using a fixture.

The fixture shown in FIG. 4 has a hole 62 penetrating from one side surface to the other side surface in parallel with the long side of the rectangular parallelepiped block 61, and the hole 62 from the upper surface parallel to the extending direction of the hole 62. A plurality of screw holes 63, 63 that reach up to, and set screws 64, 64 are screwed into these screw holes 63, 63, and the tip end of the screw is abutted against the tension member TM passing through the hole 62 to stop the tension member TM. Screw 64
The tip surface and the peripheral surface of the hole 62 are pressed and fixed.

[Problems to be solved by the invention]

By the way, none of the conventional fixtures as described above can obtain a sufficient fixing force, and especially when the tension member is a steel stranded wire, the fixing force varies depending on the position, and the tension member disperses and the tensile strength decreases. There was such a problem.

[Means for solving problems]

The present invention has been made in view of such circumstances, and an object thereof is to reliably obtain a fixing force even with respect to a plurality of tension members by changing the abutting direction of the set screw to the tension members. It is to provide a fixing member for the tension member.

The tension member fixture according to the present invention is a fixture for fixing a tension member to an inner surface of a hole by pressing a tension member at a connection portion of optical fiber cables to each other. It is characterized by alternately projecting from two directions orthogonal to each other in the axial direction of the hole.

〔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 device for connecting optical fiber cables to each other, which is provided with a fixing member for a tension member according to the present invention.
Is a flange, 3 is a connecting plate, 4 is a housing box, and 5 is an optical fiber.
A storage case with an extra length of 1f, and 10 are fixtures of the tension member TM which is the product of the present invention.

The optical fiber cables 1 and 1 have their coatings 1a and 1a cut off for a required length, respectively, and a plurality of optical fibers 1f and one tension member TM are exposed to an appropriate length. Flange 2 and 2 are attached to the respective ends of the optical fiber cables 1 and 1 so as to sandwich the respective coatings 1a and 1a from the inside and the outside. Are fixed to the flanges 2 and 2 with screws. The connecting plate 3 is a long plate made of aluminum or the like,
A housing box 4 is arranged at the center of the upper surface, and fixing members 10 for the tension member TM are arranged on both sides thereof (only one side is shown in the drawing).

The housing box 4 is composed of bottom plates 4a, left and right plates 4b, 4c, and upper plates 4d, 4d projecting in opposite directions from the upper ends of both side plates 4b, 4c, and the longitudinal sides of the connecting plate 3 are open. It is formed in the shape of a hollow rectangular box, and a plurality of storage cases 5 are stored therein in a stacked state. Although not specifically shown in each storage case 5, the connection portion of the optical fiber 1f and the extra length portion connected to the connection portion are stored in a loop.

The fixture 10, which is the product of the present invention, is constructed as shown in FIG. FIG. 2 is a partially cutaway perspective view of the product of the present invention, in which 11 is a clamp member and 12a, 12b, 12c are set screws.

The clamp member 11 is formed in a substantially pentagonal prism shape, and a hole 11a having the same diameter as the tension member TM or slightly larger than that of the tension member TM is horizontally provided from one side surface to the other side surface thereof.
From the upper surface orthogonal to the axis of the hole 11a, the screw hole 11
b, 11c, and screw holes 11d are formed from the bottom surface so as to reach the holes 11a, respectively, and the set screw 1 is formed in each screw hole 11b, 11c, 11d.
2a, 12b, 12c are screwed together so that their tip ends protrude into the hole 11a, and the tension member T passed through the hole 11a.
M is pressed against the upper and lower peripheral surfaces of the hole 11a alternately in the axial direction of the hole 11a.

The stopper 13 is a long plate whose axial dimension is substantially equal to the width dimension of the clamp member 11, and the set screw 13 is provided on the base end surface of the clamp member 11.
It is integrally fixed at a, and when the product is fixed on the connecting plate 3 as shown in FIG. 1, the storage case 5 comes out of the storage box 4 so as to face the opening ends on both sides in the longitudinal direction of the storage box 4. It is designed to prevent

As described above, the tension member is used in this product.
Insert TM into the hole 11a of the clamp member 11 and extend its tip to a position where it contacts the stopper 13.In this state, screw the set screws 12a, 12b, 12c into the screw holes 11b, 11c, 11d. When tightened and the stopper 13 is positioned on the side of the storage box 4 and fixed on the connecting plate 3, the tension member TM becomes the clamp member 11.
It is pressed against the peripheral wall of the hole 11a and firmly connected and held.

Especially because the tension member is made of metal such as steel stranded wire,
The upper surface and the lower surface are pressed against the inner peripheral surface of the hole of the clamp member 11 and the lower surface, respectively, so that a large holding force can be obtained and the tension member does not come apart.

FIG. 3 is a partially cutaway perspective view showing another embodiment of the present invention, in which a hole 22 having an oval cross section is formed through a block 21 made of steel or aluminum and the surfaces of the block 21 facing each other, for example, At least three screw holes 23a, 23b, 23c are formed at regular intervals from the upper and lower surfaces toward the hole 22, and each of the holes 23a, 23b, 2
3c, the set screw 24a, 24b, 24c is screwed and tightened in such a manner that the tip is abutted against the tension member TM inserted in the hole 22, and the tension member TM is attached to the tip surface of the set screw 24a, 24b, 24c and the peripheral wall of the hole 22. It is designed so that it can be held between the lower surface, the upper surface, and the lower surface alternately. The screw holes 23a and 23c are passed through the hole 22 from the upper surface to the lower surface of the block 21.
When the setscrews 24a, 24c are screwed in from above c, the setscrews 24a, 24c push the tension member TM into the portion of the screw holes 23a, 23c extending below the hole 22. As a result, the binding force on the tension member TM is significantly strengthened.

The width of the hole 22 is set to be approximately equal to the diameter of the tension member TM, and the diameter of the set screws 24a, 24b, 24c is set to the hole 22.
The set screw 24a, 24b, 24c can be surely brought into contact with the tension member TM by setting the size to be close to the width dimension, so that a large clamping force can be obtained surely.

Thus, in the above embodiment, the tension member TM
Are set screws 24a, 24b, 24c alternately in the hole 22 from the top and bottom
Is brought into contact with each other, the tensile strength can be remarkably increased, and the structure is simple.

In each of the above-mentioned embodiments, one set screw 24a, 24b, 24c is provided on each tension member alternately in the order of up, down, and up.
Although the configuration of abutting against the TM is shown, a plurality of upper and lower portions may be alternately abutted on the upper side and the lower side. Further, the screwing directions of the set screws 24a, 24b, 24c are not limited to the upper and lower directions, but may be alternately abutted from the left and right directions.

〔effect〕

As described above, in the product of the present invention, by making the tension member meander and press-contacting the inner peripheral surface of the hole, it becomes possible to significantly increase the restraining force by imparting friction and deformation resistance to the tension member respectively. The present invention has excellent effects such as an enhanced connection function for members and a simple structure.

[Brief description of drawings]

FIG. 1 is a perspective view showing an optical fiber cable connection device to which the present invention is applied, FIG. 2 is a partially cutaway enlarged perspective view of the present invention, and FIG. 3 is a partially cutaway perspective view showing another embodiment of the present invention. FIG. 4 is a partially cutaway perspective view of a conventional product. 1 ... Optical fiber cable, 1f ... Optical fiber, TM ...
Tension member, 2 ... Flange, 3 ... Connection plate, 4
…… Storage box, 5 …… Storage case, 10 …… Fixing device, 11 ……
Clamp member, 11a ... hole, 11b, 11c, 11d ... screw hole, 12
a, 12b, 12c …… Set screw, 13 …… Stopper, 21 …… Clamping member, 22 …… Hole, 23a, 23b, 23c …… Screw hole, 24a, 24b, 2
4c …… Set screw

Claims (1)

[Scope of utility model registration request] 1. A tension member made of metal is inserted into a hole of a clamp member at a connecting portion of optical fiber cables, and the tension member is attached to an inner surface of the hole by using a set screw projected from a peripheral wall of the hole into the hole. In the fixture adapted to be fixed by pressure contact with each other, the three or more setscrews are alternately projected into the hole of the clamp member from two opposite directions orthogonal to the axial direction of the hole in the axial direction of the hole. Fixing member for tension members characterized by being tightened.