JP3051738U - Optical fiber core cutting tool - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a cutting tool excellent in workability that can confirm the number of wire rods at hand and can effectively avoid erroneous cutting occurring in an optical fiber cable. SOLUTION: A pair of lever handles having a cutter blade exposed at a position opposed to a front end portion and a grip portion extended at a rear end portion are formed, and a cutter blade and a grip portion of each lever handle are formed. A pivot for connecting the two is provided between them, and in a wire cutting tool that cuts an appropriate wire by opening and closing operation of the lever handle, the wire is closed at the opposing position on the cutter blade side of each lever handle when the lever handle is closed. A pair of core receiving portions each having a size enough to be inserted are formed. A protective member which does not damage the wire is provided on the surface of the core receiving portion, and a lock mechanism for fixing the closed state of the lever handle is provided on the grip portion side of each lever handle.

Description

[Detailed description of the invention] [Industrial applications]

 The present invention relates to an optical fiber cutting tool used for cutting an optical fiber.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, various types of optical cables using optical fiber cores have been used depending on their bundle form and the like. One of them is an SM-type overhead collection drop optical fiber.

[0003] This optical cable uses two-fiber / 4-fiber / 8-fiber optical fibers, and a plurality of optical cables (hereinafter, referred to as wires in the present invention) including the optical fibers are wound around a support wire in a spiral shape. It has become. Each wire constituting the cable is integrated with two tension members (piano wires) having a hardness of about HRC40-48 for fiber protection and tension support.

[0004] Therefore, when connecting this fiber cable near the pole (closure D), grasp an arbitrary wire from the twisted portion and check the core number displayed on the jacket while checking the core number. Need to cut.

[0005]

[Problems to be solved by the invention]

 By the way, in these operations, due to the cable pull-out conditions, the cutting position is about 1.1 m away from the pillar where humans exist, and especially in places where bucket trucks cannot be used, stretch the safety belt rope and They checked the wire number while embarking, pulled out the wire, and cut it with pliers or other general-purpose tools.

[0006] However, the wire numbers displayed on the jacket are extremely small, and they are twisted in a spiral shape, making it difficult to confirm the wire numbers. .

[0007]

[Means to solve the problem]

 The present invention has been made in view of the above problems, and has the following structure and functions in order to improve the workability when performing the above-described optical fiber cable core cutting work on a pillar. A tool was provided.

First, in disclosing the present invention, the present inventors take advantage of the fact that the wire numbers are continuously displayed on the outer jacket of each wire, and use the wire numbers existing close to the pillar. After confirming the above, it was thought that a dangerous work could be avoided by attaching a cord confirmation ring (not shown), moving the ring etc. to the 1.1m position along the wire and cutting it.

However, in this case, it cannot be said that the risk of erroneous cutting due to the separate ring and cutting tool can be sufficiently avoided.

[0010] Therefore, a cutting tool comprising a pair of lever handles having a cutter blade exposed at a position opposed to a front end portion and a grip portion extended at a rear end portion, more specifically, a cutter blade of the lever handle is provided. A pivot is provided between the gripper and a general-purpose pliers-like cutting tool that cuts optical fibers and other wires by opening and closing this lever handle. When a prototype tool was manufactured and verified, good results were obtained.

The main structural feature of the cutting tool according to the present invention is that a pair of lever handles each having a size large enough to allow the wire to be inserted into the position opposite to the cutter blade side when the lever handle is closed. That is, the core receiving portion is formed. The core receiving portion is a circular groove in the embodiment, and a protection member which does not damage the wire is provided on the surface.

[0012] With this structure, the worker grips the wire having the wire number confirmed near the column at the core receiving portion, moves the tool along the wire to the cut portion as it is, and At this point, the lever handle is opened and the wire is cut to prevent erroneous cutting.

In the present invention, a locking mechanism for fixing the closed state of the lever handle is provided on the grip portion side of each lever handle for more secure grip. Hereinafter, these will be described along with embodiments of the invention.

[0014]

【Example】

 FIG. 1 is an overall explanatory diagram showing a first embodiment of the cutting tool of the present invention in an open state, and FIG. 2 is an overall explanatory diagram showing a second embodiment of the cutting tool of the present invention in an open state. FIG. 4 is an overall explanatory view showing a closed state of the cutting tool of the present invention, and FIG. 4 is an external view showing a state where a wire is inserted through the cutting tool of the present invention.

The present invention can be applied to electric wires and the like, but is effectively used mainly in the optical fiber multi-core cable shown in FIG. This optical fiber multi-core cable is a cable made by twisting a plurality of wires A composed of a core wire, a tension member, and a coating thereof, and the surface of the jacket of each wire A is a connection ID. The numbers (not shown) are continuously described along the length direction.

In the cutting tool 1 of the present invention, as shown in FIGS. 1 to 4, the cutter blade 6.7 is exposed at a position opposed to the front end portion, and the grip portion 2.3 is extended at the rear end portion. It is formed as a tool that can be opened and closed by intersecting a pair of plate-shaped lever handles 4.5 provided on a pivot 15.

As shown in the figure, the closing operation of the lever handle 4.5 is located at a position facing the cutter blade 6.7 side of each of the lever handles 4.5, in this embodiment, on the distal end side of the cutter blade 6.7. Sometimes, a pair of semicircular core receiving portions 10.11 each having a semicircular shape so as to have a size enough to insert the wire A is recessed in a state covered with a plastic protective member 8.9. I have.

A coil spring 16 for urging the opening / closing operation is hung over the grip portion 2.3 of each of the lever handles 4.5. Body 4a. A locking mechanism is formed which comprises a hook-shaped member 12.13 pivoting about 5a.

The hook-shaped member 12.13 is provided with a depression 4a. Formed in the outer edge of the central side of the lever handle 4.5 by its rotation operation. The lever handle 4.5 is devised so that the lever handle 4.5 is kept in a closed state by being pressed into contact with the lever 5a. More specifically, a recess 13a is formed at the tip of one hook-shaped member 13, which is fitted into the projection 4b of the lever handle 4 at the time of locking to further strengthen the lock.

In order to use the cutting tool 1 of the present invention, first, as shown in FIG. 1, both hook-shaped members 12.13 are removed, and the lever handle 4.5 is widely opened.

In this state, the worker on the pole checks the wire number of the nearby cable, finds the wire A to be cut, and locks one hook-shaped member 13 as shown in FIG. Then, after the wire A is opened so as to be small enough to pass through, the wire A is passed through the gap at the distal end, and is guided into the core receiving portion 10.10.

Then, as shown in FIG. 3, when the other hook-shaped member 12 is locked, the cutting tool 1 is closed as shown in FIG. 4, and moves along the wire A. Since it is only possible to rotate the wire A along the length direction, the wire A is guided to the cut portion on the other side.

Then, when the movement to the cutting section is completed, the state is returned to the state shown in FIG. 2, and the wire A is cut by the lower cutter blade 6.7. At this time, it is also possible to cut as shown in FIG.

The cutter blade 6.7 needs to cut not only the optical fiber core wire in the wire A but also the integrated tension member (HRC40-48) at the same time. HRC60-64), which makes it possible to carry out the cutting work extremely smoothly by the above procedure.

[0022]

[Effect of the invention]

 Since the present invention is configured as described above, the number of the wire can be checked at hand, so that the work is easy, and the work can be maintained even in a dark place by the lighting at hand. Also, when the tool is moved along the fiber core, it is kept closed by the lock mechanism, so that it does not contact the cutter blade, and the protection of the receiving part damages the sheath of the fiber core. It is possible to guide to the cutting position without performing. In general, the tool of the present invention is an epoch-making and significant invention that enables the above-mentioned working process, and in particular, makes it possible to effectively avoid erroneous cutting that has occurred in optical fiber cables.

[0023]

[Brief description of the drawings]

FIG. 1 is an overall explanatory view showing a first mode of an open state of a cutting tool of the present invention.

FIG. 2 is an overall explanatory view showing a second embodiment of the open state of the cutting tool of the present invention.

FIG. 3 is an overall explanatory view showing a closed state of the cutting tool of the present invention.

FIG. 4 is an external view showing a state in which a wire is inserted through the cutting tool of the present invention.

[Explanation of symbols]

 A Wire rod 1 Cutting tool 2 Gripping part 3 Gripping part 4 Lever handle 4a Shaft 4b Projection 5 Lever handle 5a Shaft 6 Cutter blade 7 Cutter blade 8 Protective member 9 Protective member 10 Core receiving portion 11 Core receiving portion 12 Hook-shaped member 13 Hook-shaped member 13a recess 15 Axis 16 Coil spring

Claims (3)

[Utility model registration claims] 1. A pair of lever handles having a cutter blade exposed at a position opposed to a front end portion and a grip portion extending at a rear end portion are formed, and the cutter blade of each lever handle and the grip portion are formed. A cutting tool for cutting a wire rod by opening and closing the lever handle, and closing the lever handle at a position facing the cutter blade side of each of the lever handles. An optical fiber core cutting tool comprising a pair of core receiving portions each having a size enough to insert the wire during operation. 2. The optical fiber core cutting tool according to claim 1, wherein a protective member that does not damage the wire is provided on the surface of the core receiving portion. 3. The optical fiber core wire cutting tool according to claim 1, wherein a lock mechanism for fixing a closed state of the lever handle is provided on a grip portion side of each of the lever handles. [0001]