JP2002171653A - Tool and method for gripping cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool and a method for gripping a cable which eliminate deformation of the cable such as eccentricity of the cable and reduction of a diameter, etc., and can maintain performance of the cable when the cable is gripped in the long term. SOLUTION: The cable gripping tool comprises a pair of upper and lower grips 4, 5 which have semicircular cable contacting surfaces 4a, 5a forming a cross section corresponding to a cross-sectional shape of the cable 2, adds gripping force, which is generated by a gripping force generating part 6, to the grips 4, 5, and grips the cable 2. When the cable contacting surfaces 4a, 5a of the upper and lower grips 4, 5 grip the cable 2 by the gripping force of the upper and lower grip 4, 5, the cable contacting surfaces 4a, 5a respectively have an area substantially not to deform the cable 2. The area is found by the gripping force per unit area which deforms the cable 2 and the gripping force applied to entire cable contacting surfaces 4a, 5a and required to fix the cable 2.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a cable gripper and a cable gripping method, and more particularly, to a cable for a long period of time without deformation such as eccentricity and reduction in diameter of a cable. The present invention relates to a cable gripper and a cable gripping method capable of maintaining the performance of a cable even when gripped. 2. Description of the Related Art When laying cross-linked polyethylene insulated power cables (hereinafter sometimes referred to as "CV cables") and the like, C-shaped cables are provided at intervals of several meters.
Gripping a V cable has been performed. As shown in FIG. 5, a conventional cable gripping metal includes a pair of upper gripping metal 14 and a lower gripping metal having cable contact surfaces 14a and 15a having a substantially semicircular cross section corresponding to the cross-sectional shape of the CV cable 12. Metal fitting 15 and cable contact surface 1 of upper grip metal fitting 14 and lower grip metal fitting 15
Rubber packing 13 (13a, 1a,
3b), a tightening bolt 16a provided through both ends of the upper gripping metal fitting 14 and the lower gripping metal fitting 15 on the cable contact surfaces 14a, 15a side, and the tightening bolt 1
Spring 16b disposed around the bolt axis of 6a
And a fixing bolt 11 provided at an end of the lower holding metal fitting 15 on the installation surface 15b side to fix the cable holding metal to the base material.
The one having the following is used. In this cable grip, the spring 16b is biased by tightening the fastening bolt 16a to a predetermined position, and the upper grip 14 and the lower grip 15 are pressed by the biasing force of the spring 16b. A fixed clamping force is applied to the pressed upper grip 14 and lower grip 15, and C
The V cable 12 is gripped by this pinching force (via the rubber packing 13). [0004] However, in the conventional cable-holding metal fitting, the CV cable 12 is heated at the time of energization so that the covering material is softened.
4 and cable contact surfaces 14a, 15a of lower grip 15
Has been set in consideration of only the point of gripping the CV cable 12, the clamping force of the gripping portions 14, 15 causes the CV cable 12 to be deformed such as eccentricity and a small diameter, thereby deteriorating its performance. There was a problem. In particular,
When the CV cable 12 is gripped for a long period of time, stress is continuously applied to the CV cable 12, and a serious obstacle such as disconnection may occur. Accordingly, an object of the present invention is to provide a cable gripper and a cable gripping method which can maintain the performance of the cable even when gripped for a long period without deformation such as eccentricity of the cable and reduction in diameter. To provide. SUMMARY OF THE INVENTION The present invention provides the following cable gripper and cable gripping method to achieve the above object. [1] A pair of upper gripping portions and lower gripping portions having a cable contact surface whose cross section corresponding to the cross-sectional shape of the cable is substantially semicircular is provided, and the gripping force generated by the gripping force generating portion is applied to these gripping portions. In the cable gripping device for additionally gripping the cable, the cable contact surface of the upper gripping portion and the lower gripping portion deforms when the cable is gripped by the clamping force of the upper gripping portion and the lower gripping portion. The cable has a large area that does not substantially deform the cable, which is determined from the clamping force per unit area to be fixed and the clamping force on the entire cable contact surface required to fix the cable. Cable gripper. [2] The upper and lower gripping portions are formed by a single member extending in the longitudinal direction of the cable, and the holding force generating portion is formed by the single member in the longitudinal direction of the cable. The cable gripper according to the above [1], including a plurality of pinching force generating portions provided at predetermined intervals on the member. [3] The above-mentioned [1], wherein the upper grip portion and / or the lower grip portion has a heat radiating means on an outer surface thereof.
Or the cable gripper of [2]. [4] The pinching force per unit area where deformation such as eccentricity and small diameter of the cable occurs when the cable is gripped and fixed is obtained by the cable contact surfaces of the pair of cable gripping tools, and the deformation is generated. The cable without subjecting the cable to the deformation based on the clamping force obtained by multiplying the clamping force per unit area by a predetermined coefficient and the clamping force on the entire cable contact surface required to fix the cable. The area of the cable contact surface of the cable gripper for fixing the cable gripper is determined, and based on the area, the elongate direction in the cable contact surface of the cable gripper according to the inner diameter of the cable contact surface of the cable gripper. The length of the cable is determined, and the cable is pinched by the pair of cable grippers having the cable contact surface having the inner diameter and the length. Cable holding method characterized by and fixed. [0011] In the cable gripper of the present invention, by adopting the configuration of [1], deformation such as eccentricity of the cable and reduction in the diameter of the cable may occur even in a cable whose coating material is softened by heating during energization. Therefore, maintaining the performance of the grasped cable as it is over a long period of time can avoid a serious obstacle such as disconnection. [0012] Further, by adopting the configuration of [2], the heat of the cable can be released to the outside and the softening of the cable can be suppressed, so that the deformation of the cable due to the pressing of the cable contact surface of the cable gripper can be reduced. It can be reliably prevented. [0013] In the cable gripping method of the present invention, by adopting the configuration of [4], deformation such as eccentricity and small diameter of the cable may occur even in a cable in which the coating material is softened by heating during energization. Therefore, maintaining the performance of the held cable as it is for a long period of time can also avoid a serious obstacle such as disconnection. Embodiments of the present invention will be specifically described below with reference to the drawings. 1. As shown in FIG. 1, the cable gripper of the present invention includes a pair of upper gripper 4 and lower gripper having cable contact surfaces 4 a and 5 a having a substantially semicircular cross section corresponding to the cross-sectional shape of the cable 2. The gripping portions 4 and 5 are provided with a gripping force generated by the gripping force generating portion 6 to grip the cable 2. The cable gripping surfaces 4 a and 5 a of the upper gripping portion 4 and the lower gripping portion 5 are provided. However, when the cable 2 is gripped by the upper gripping portion 4 and the lower gripping portion 5, the cable 2 deforms when the cable 2 is deformed, and the cable contact surface 4 a required for fixing the cable 2, The cable 2 has an area large enough not to substantially deform the cable 2 determined from the clamping force in the entire 5a. Specifically, for example, as shown in FIGS. 1 and 2, the cable contact surfaces 14a and 15a in the conventional gripping tool shown in FIG. The clamping force required to grip the cable 2 per unit area is doubled or tripled based on the clamping force of the entire cable contact surfaces 4a and 5a required to fix the cable 2 There can be mentioned those reduced to 1/2 or 1/3 or less. The upper grip 4 and the lower grip 5 used in the present invention preferably cover the cable contact surfaces 4a, 5a with a deformable elastic body 3 in order to increase the contact resistance with the cable. Further, it is preferable that the elastic body 3 is softer than the covering material of the cable 2 when energized. The gripping force generating portion 6 for applying a gripping force to the gripping portions 4, 5 is, for example, a tightening bolt 6 a provided through both ends of the upper gripping tool 4 and the lower gripping tool 5.
It is arranged around the bolt axis of this tightening bolt,
A spring 6b which is biased by tightening the spring 6b to a predetermined position and presses the upper gripping portion 4 with a certain force to apply a certain clamping force may be used. In addition, for example, a pressing force generated by urging a syringe, a rubber elastic body, a leaf spring, or the like may be used. In addition, the upper and lower grips 4 and 5 are formed by a single member extending in the longitudinal direction of the cable 2 from the viewpoint of applying a uniform clamping force to the cable contact surfaces 4a and 5a of the grips 4 and 5. It is preferable that a plurality of the holding force generating portions 6 are formed at a predetermined interval in a single member in the longitudinal direction of the cable 2. As shown in FIG. 3, a gripping force generator 6 for applying a gripping force to the grippers 4, 5 is provided through one end of the upper gripper 4 and the lower gripper 5. The other end of the lower grip 5 can be connected and integrated. As shown in FIG. 4, it is preferable that the upper holding portion 4 and / or the lower holding portion 5 used in the present invention is further provided with a heat radiating means 8 on its outer surface. Examples of the heat dissipating means 8 include those in which fins or the like are provided on the outer surface to increase the surface area. Further, in order to increase the heat radiation effect, it is preferable that the materials of the grip portions 4, 5 and the heat radiation means 8 have high thermal conductivity. As shown in FIG. 1, for example, the cable gripper of the present invention can be fixed to a base such as a gantry or concrete through a lower gripper 5 by a fixing means 1 such as a fixing bolt. 2. Cable gripping method The cable gripping method of the present invention obtains a clamping force per unit area where the cable is deformed such as eccentricity and small diameter when the cable is gripped and fixed by a cable contact surface of a pair of cable gripping tools. A cable gripper for fixing a cable without deforming the cable based on a clamping force obtained by multiplying a clamping force per unit area by which a deformation occurs by a predetermined coefficient and a clamping force required for fixing the cable. The area of the cable contact surface of the cable gripper is determined based on the area of the cable contact surface of the cable gripper. The cable is pinched and fixed by a pair of cable grippers having a cable contact surface as described above. More specifically, the cable can be clamped and fixed by the pair of cable gripping tools described above. As described above, according to the cable gripper of the present invention, there is no deformation such as eccentricity of the cable and reduction in diameter, and the performance of the cable is maintained even when gripped for a long period of time. The present invention can provide a cable gripper and a cable gripping method that can perform the above.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view schematically showing one embodiment of a cable gripper of the present invention, wherein (a) is a side view and (b) is a front view. FIGS. 2A and 2B are explanatory views schematically showing another embodiment of the cable gripper of the present invention, wherein FIG. 2A is a side view and FIG. 2B is a front view. FIG. 3 is an explanatory view schematically showing another embodiment of the cable gripper of the present invention, wherein (a) is a side view and (b) is a front view. 4A and 4B are explanatory views schematically showing another embodiment of the cable gripper of the present invention, wherein FIG. 4A is a side view and FIG. 4B is a front view. FIGS. 5A and 5B are explanatory views schematically showing an example of a conventional cable gripper, in which FIG. 5A is a side view and FIG. 5B is a front view. [Description of Signs] 1: Fixing means 2: Cable 3 (3a, 3b): Elastic body 4: Upper gripping tool 4a: Cable contact surface 5: Lower gripping tool 5a: Cable contact surface 5b: Installation surface 6: Nipping force generation Part 6a: fastening bolt 6b: spring 8: heat radiating means 11: fixing bolt 12: CV cables 13a, 13b: rubber packing 14: upper grip 14a: cable contact surface 15: lower grip 15a: cable contact 15b: installation surface 16: pressing means 16a: fastening bolt 16b: spring

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Takashi Nakagawa             3-22 Nakanoshima, Kita-ku, Osaka-shi, Osaka             Kansai Electric Power Co., Inc. (72) Inventor Tsutomu Tashiro             Hitachi 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture             Electric Wire Co., Ltd. (72) Inventor Hiroshi Kamoshida             Hitachi 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture             Inside the Hidaka Factory of Electric Wire Co., Ltd. (72) Inventor Shiro Tanno             Hitachi 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture             Electric Wire Co., Ltd. F term (reference) 3J022 DA15 EA42 EB14 EC14 EC22                       ED28 FA01 FB07 FB12 GA04                       GA12 GA14                 5G363 AA07 BA01 DA15                 5G369 AA06 BA01 BA05 BA06 BA07                       CB01 CB12 EA01

Claims (1)

Claims: 1. A pair of upper gripping portion and lower gripping portion having a cable contact surface having a substantially semicircular cross section corresponding to the cross-sectional shape of a cable, wherein the gripping portion includes a pinching force generating portion. In the cable gripper for gripping the cable by applying the generated gripping force, the cable contact surface of the upper gripping portion and the lower gripping portion grips the cable by the gripping force of the upper gripping portion and the lower gripping portion. The cable has a large area that does not substantially deform the cable, which is determined from the clamping force per unit area at which the cable is deformed and the clamping force on the entire cable contact surface required to fix the cable. A cable gripper characterized by the above-mentioned. 2. The apparatus according to claim 2, wherein the upper and lower gripping portions are formed by a single member extending in a longitudinal direction of the cable, and the holding force generating portion is formed by a single member in the longitudinal direction of the cable. 2. The cable gripper according to claim 1, further comprising a plurality of pinching force generating portions provided at predetermined intervals. 2. The method according to claim 1, wherein the upper grip portion and / or the lower grip portion includes:
The cable gripper according to claim 1 or 2, further comprising a heat radiation means on an outer surface thereof. 4. A clamping force per unit area at which deformation such as eccentricity and reduction in diameter of the cable occurs when the cable is gripped and fixed by a cable contact surface of a pair of cable gripping tools, and a unit at which the deformation is generated The holding force obtained by multiplying the holding force per area by a predetermined coefficient, and the holding force on the entire cable contact surface required to fix the cable, based on the holding force of the cable, without giving the cable the deformation. The area of the cable contact surface of the cable gripper to be fixed is determined, and the length of the cable contact surface of the cable gripper according to the inner diameter of the cable contact surface of the cable gripper is determined based on the area. The length is obtained, and the cable is clamped by the pair of cable grippers provided with the cable contact surface having the inner diameter and the length. Cable gripping method characterized by fixing.