JP2009055659A - Spacer for electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spacer for electric wire which is suitable for a UHV transmission line that allows a cable clamp to be attached to the electric wire, without causing an attachment failure, with the attachment posture of the cable clamp kept in a regular attachment state, and besides without using a special tool. <P>SOLUTION: This spacer for cables is structured such that it is provided with a rotation preventing stopper (22) for keeping the regular assembly posture of boltless cable clamps (30), when a regularly polygonal frame (23) is constituted and the boltless cable clamps (30) are coupled to terminals (14) thereby being assembled to chambers (15), that locking pieces (25) mounted to the heads of the shaft bolts (4) of the boltless cable clamps (30) are assembled to be rotatable in its horizontal direction to the axes of axial bolts, and that in attachment of the boltless cable clamps (30) to cables (C), they can be locked surely, crossing slots (24) at right angles without needing a special tool. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric wire spacer such as a boltless spacer for a multi-conductor electric wire, and more specifically, a direct current in which the number of element conductors constituting one phase is a regular polygon made up of 6 to 10 electric wires. Or it is related with the structure of the boltless spacer for multiconductors suitable for being used for an alternating current ultra-high voltage (UHV) transmission line.

Examples of conventional boltless electric wire gripping portions of this type include those described in FIGS. 1 to 10 of Patent Document 1 and FIGS. 1 to 3 of Patent Document 2.
No. 07-056572 Japanese Patent Laid-Open No. 08-228422

  The wire gripping portion of Patent Document 1 is shown in [FIGS. 9 to 11] attached to the present application. In these [FIGS. 9 to 11], reference numeral (1 ′) denotes a boltless wire gripping portion main body, and a presser foot (2 ′) is rotatably attached by a pin (3 ′), and the electric wire (4 ′) is held and held by both of them. Further, the bolt-less electric wire gripping part main body (1 ′) has a through hole (5 ′) through which a T bolt (21 ′) described later passes on the opposite side of the pin (3 ′) with respect to the electric wire (4 ′). A U-shaped portion (11 ′) is provided on the side opposite to the presser foot (2 ′) with respect to the through hole (5 ′). It is provided integrally with the boltless electric wire gripping part main body (1 ′). Further, a screw hole (12 ′) through which a screw member described later, for example, a push screw (13 ′) is threaded, is provided at the bottom of the U-shaped portion (11 ′). Furthermore, the boltless wire gripping portion main body (1 ′) opposite to the pin (3 ′) with respect to the wire (4 ′) is provided with a boltless wire gripping portion, for example, a spacer frame (not shown). A connecting portion (14 ') for attachment to the like is provided.

a
Next, (21 ') is the T bolt described above, and a T portion (21'c) is provided at the tip, and a screw portion (21'a) is formed at the end. . Further, the end of the presser foot (2 ′) opposite to the pin (3 ′) with respect to the electric wire (4 ′), as shown in FIG. 9, is a fork corresponding to the through hole (5 ′). (15 ') is formed, and its width L is wider than the width of the T portion (21'c) of the T bolt (21'), and the T bolt (21 ') passes through the through hole (5'). In this case, when the longitudinal direction of the T portion (21′c) coincides with the longitudinal direction of the fork portion (15 ′), the T portion (21′c) replaces the fork portion (15 ′). It is possible to pass through, and when the above two directions intersect each other, it is formed so as not to pass.

Further, the screw member (21′b) of the T bolt (21 ′) is provided with a nut (7 ′) and a washer (8 ′), and this washer (8 ′) and a through hole (5 ′) are provided. An elastic member such as a compression coil spring (9 ′) is provided between the boltless electric wire gripping part main body (1 ′) and constitutes a spring device (10 ′).
Further, when a screw member, such as a push screw (13 '), is screwed into a screw hole (12') formed in the bottom of the U-shaped part (11 ') of the boltless wire gripping part main body (1'). The tip of the tip abuts against the end face of the T-bolt (21 ′) and moves the T-bolt (21 ′) toward the T portion (21′c) against the tension of the compression coil spring (9 ′). Let

  Since the conventional boltless wire gripping portion is configured as described above, when gripping the wire, the T portion (21′c) of the T bolt (21 ′) is aligned with the fork portion (15 ′), and Screw the push screw (13 '). In this state, after the electric wire (4 ′) is inserted between the boltless electric wire gripping part main body (1 ′) and the presser foot (2 ′), the presser foot (2 ′) is closed and the boltless electric wire gripping part main body (1 Oppose to '). At this time, in a state where the press screw (13 ′) is returned, the T portion (21′c) of the T bolt (21 ′) enters the fork (15 ′) of the presser foot (2 ′). Since the T part (21'c) does not come out of the surface of the presser foot (2 '), the T bolt (21') is rotated and the T part (21'c) is hooked on the fork (15 '). I can't. Therefore, by rotating and pushing the push screw (13 ′), the compression coil spring (9 ′) is compressed and the T bolt (21 ′) is moved to the T portion (21′c) side. The part (21′c) is protruded from the surface of the presser foot (2 ′). Therefore, in this state, the T bolt (21 ′) can be rotated.

  Next, the T-bolt (21 ′) is rotated so that the T portion (21′c) and the fork portion (15 ′) intersect, in particular perpendicular to each other, and then the push screw (13 ′) is returned and removed. The T-bolt (21 ') is loaded in the direction of the threaded portion (21'a) by the compression coil spring (9'), and the T portion (21'c) is pressed against the surface of the presser foot (2 '). To hold the wire (4 ′). When the T-bolt (21 ′) is rotated to cross the T portion (21′c) and the fork portion (15 ′), in particular, perpendicular to each other, the T-portion (21′c) is bifurcated. A special tool (not shown) is fitted and rotated 90 degrees to be locked.

  As shown in [FIGS. 12 to 14] attached to the present application, the wire gripping device (100) of Patent Document 2 includes a clamp body (1A), a clamp lid (1B), and a connecting body. And a T-bolt (102), a first spring (10 (103)) as a spring body, a spring receiving portion (104), and a push bolt (105).

  The clamp body (1A) has a semi-cylindrical first recess (C1) and a storage space (1C). The clamp lid (1B) has a semi-cylindrical second recess (C2) and a bolt engaging portion (1G) having a slit (1S) with a certain width, and is clamped by a hinge (110). The main body (1A) is hinged so that it can be opened and closed. With such a configuration, when the clamp lid (1B) is closed to the clamp body (1A), the electric wire (W) is sandwiched in the cylindrical recess formed by the first recess (C1) and the second recess (C2). (See FIG. 14).

The T-bolt (102) is formed by a head (2A) which is a clamp engaging portion, and a rod-like portion (2B) fixed to the head (2A). The head (2A) has a block shape having a width passing through the slit (1S) provided in the clamp lid ((1B)) and a length larger than the width of the slit (1S). The rod-like portion (2B) is made of a cylindrical member, and a male screw portion is provided on the circumferential surface thereof. One side of the storage space (1C) of the clamp body (1A) is provided with an insertion hole (1E) through which the rod-shaped portion (2B) of the T-bolt (102) can be inserted, and the rod-shaped portion (2B) is stored. It enters the space (1C). With such a configuration, the head (2A) of the T-bolt (102) can be moved in the axial direction of the rod-shaped portion (2B) from the clamp body (1A), and the axis of the rod-shaped portion (2B) is the center of rotation. It can be rotated.
Therefore, the head (2A) of the T-bolt (102) is moved toward the clamp body 1A in the axial direction of the rod-shaped portion (2B), and is rotated by an angle of 90 degrees around the axis of the rod-shaped portion (2B). The bottom surface of the horizontal member is locked to the upper surface of the bolt engaging portion 1G of the clamp lid (1B), and the clamp body 1A and the clamp lid (1B) can be connected.

  The first spring (103) is a string-wound spring, and penetrates the rod-like portion (2B) of the T-bolt 2 in the storage space 1C of the clamp body 1A, and one end of the first spring (103) is a lower surface on one side of the clamp body 1A The other end is supported by the spring support portion 4. With such a configuration, the first spring (103) urges the T-bolt (102) in the first direction, which is a direction in which the T-bolt (102) approaches the clamp body (1A).

  The spring receiving portion 4 includes a spring support (106), a nut (107), a lid (108), and a second spring (109). The spring support 106) includes a flat plate member that supports the other end of the first spring 103 and a hollow cylindrical member, and a rod-shaped portion 2B of the T-bolt 102 at the center of the flat plate member. An insertion hole (6A) is provided through which can be rotatably inserted. The nut (107) has a female screw portion that is screwed into the male screw portion of the rod-like portion (2B) of the T-bolt (102), and is housed inside the hollow cylindrical member of the spring support (106). It is attached to the rod-shaped part (2B) as described. The end of the spring support (106) opposite to the flat plate member is an opening, and a lid (108) is attached to the opening. The lid (108) can move freely in the axial direction of the T-bolt (102) with respect to the spring support (106), and between the lid (108) and the nut (107), a backlash prevention is provided. A second spring (109) is disposed, and the tail portion of the rod-like portion (2B) of the T-bolt (102) and the lid (108) are not in direct contact with each other. Therefore, when the lid (108) is pressed, the compressive force is transmitted to the first spring (103) via the spring support (106), and the compressive force is applied to the tail of the rod-like portion (2B) of the T-bolt (102). Don't join.

  The push bolt (105) is provided on one side of the storage space (1) C of the clamp body (1A) and on the side opposite to the side where the insertion hole (1E) is provided. Is screwed into the bolt hole (1F) formed with the tip, and the tip of the bolt hole (1F) contacts the lid (108) of the spring receiving portion (104) in the storage space (1C).

  Next, operation | movement of said electric wire holding | gripping apparatus (100) is demonstrated using FIGS. With the above configuration, when the push bolt (105) is rotated and tightened, the tip of the push bolt (105) presses the lid (108) of the spring receiving portion (104), thereby compressing the spring support ( 106) is applied to the first spring (103) via the first spring (103), and the nut (107) is always subjected to a compressive force by the second spring (109) to prevent backlash. Therefore, the push bolt (105), the lid (108), and the first spring (103) constitute a pressing means. That is, the compression force or the like does not act on the tail portion of the rod-like portion (2B) of the T-bolt (102), resulting in an unloaded state. For this reason, the head (2A) of the T-bolt (102) can be easily rotated with a slight force, for example, bare hands.

  On the other hand, if the push bolt (105) is tightened, the nut (107) is rotated, and the nut (107) is moved in the same direction as the push bolt (105) is tightened, the first spring (103) is added. Since the compressive force increases, the first spring (103) contracts, and the spring support (106) of the spring receiving portion (104) moves toward the spring support (1D). Accordingly, the rod-like portion (2B) of the T-bolt (102) protrudes from the clamp body (1A), and the bottom surface of the head (2A) of the T-bolt (102) and the bolt engagement between the clamp lid (1B). The top surface of the portion (1G) is separated and the state as shown in FIG. 12 is obtained. Thus, the spring support (106) is supported by the male screw portion provided on the rod-shaped portion (2B) of the T-bolt 2 and the nut (107), and the rod-shaped portion (2B) is in an unloaded state. Therefore, the male screw portion provided on the rod-like portion (2B) of the T-bolt (102) and the nut (107) constitute a connecting means.

Therefore, in the case of the wire gripping device (100) of the present embodiment, after the state shown in FIG. 12, it is attached to the wire or the like by the following operation.
(1) Open the clamp lid (1B), put the wire (W) (see Fig. 14) in the first recess (C1) of the clamp body (1A), close the clamp lid (1B) by hand, (W) is clamped between the clamp body (1A) and the clamp lid (1B).
(2) While holding the clamp lid (1B) closed with one hand, rotate the head (2A) of the T-bolt (102) by 90 degrees with that hand, and the head of the T-bolt (102) The part (2A) is locked to the bolt engaging part (1G) of the clamp lid (1B), and temporarily clamped so that the clamp lid does not open.
(3) Loosen and remove the push bolt (105) with a tool such as a spanner (see FIG. 14).

  In summary, the clamp body (1A) having the semi-cylindrical first recess (C1) and the semi-cylindrical second recess (C2) can be opened and closed to the clamp body (1A). A clamp lid (1B) that is hinged to a clamp body by a hinge (110) and that closes toward the clamp body to sandwich an electric wire (w) in a cylindrical recess formed by the first recess and the second recess. A T-bolt that is placed between the clamp body that sandwiches the electric wire in the cylindrical recess and the clamp lid and has a width that can be engaged with the clamp lid and a length that prevents disengagement of the engagement ( 102) a clamping member having a head ((2A)) and a rod-like portion ((2B)) of a character bolt (102) that passes through the clamp body in a non-fixed manner, and is engaged with the clamp lid By a first spring (103) that presses the head of the clamping member against the clamp lid Elastic means for generating elastic force; and elastic force releasing means for releasing an elastic relationship between the elastic means and the holding member so that the elastic force does not act on the holding member; The electric wire is clamped in the cylindrical recess of the clamp lid, and the head of the clamping member is engaged with the clamp lid in a state where the elastic relationship is released by the elastic force release means, and the clamp Rotating a member head to prevent disengagement of the engagement relationship, and then prohibiting release of the elastic relationship by the elastic force releasing means, and the elastic force of the elastic means to An electric wire gripping device configured to be pressed against the clamp lid.

  Since the conventional device of Patent Document 1 is configured and operates as described above, the variation in the gripping force of the electric wire is extremely small, and a predetermined gripping force is given by removing the push screw, so that confirmation after construction can be performed. It does not require a wrench and has many other advantages. However, on the other hand, when the T part is engaged with the fork, the T bolt is crossed and engaged with the T bolt outside the lattice wrench used for removing the push screw. Since the shaft is under compressive force, it cannot be manually crossed and engaged, requires a special bifurcated tool in addition to the ratchet wrench for removing the push screw, and has an unstable height. However, since two types of installation tools are required, the workability is poor and inconvenient, and there is a problem to be solved.

  The conventional device of Patent Document 2 solves the problem of Patent Document 1 and does not require a special tool for locking the T-bolt head to the clamp lid (1B). In order to be able to rotate, the structure of the spring receiving portion provided on the other end side of the T-bolt head is a complicated mechanism, and it is suitable for a spacer for a UHV transmission line that requires a large number of bolt-less wire gripping portions. As a result, there is a problem that the weight of the entire spacer increases and the cost increases.

Also, in any of the above patent documents, only the structure of the boltless wire gripping portion is shown, but when the number of conductors is as many as 8 to 10 as in the UHV transmission line, the gripping portion is set in a predetermined direction. If they are not attached to the electric wire in a uniform manner, a sharp point where corona such as a protrusion of the gripping portion is likely to occur is located at a high potential gradient. As a result, there is a risk of corona noise being generated due to radio wave interference to a radio, TV, etc., or in the rain.
In order to prevent such a failure, it is necessary to attach the wire part to the electric wire while keeping the predetermined position and posture without floating, but such a function is not described in the spacer of the above literature, There is a common problem that a spacer for a UHV transmission line that can solve these problems cannot be provided.

In order to solve this problem and achieve the object, the following means is used for the wire spacer of the present invention suitable for a UHV transmission line or the like.
(1) The same number of connecting members (20) and chambers (15) as the number of wires to be gripped are joined together to form a polygonal spacer frame (23), the same number of clamps (1) as the number of wires to be gripped, 2) an electric wire spacer comprising a shaft bolt (4), a spring (5), a push bolt (9), and a terminal (14),
The clamp (1) and the clamp (2) are configured to be openable and closable around the connecting pin (3), and an electric wire is sandwiched between them.
The shaft bolt (4) is arranged to penetrate the clamp (1) and the clamp (2),
A locking piece (25) is disposed at the end of the shaft bolt (4) on the clamp (1) side, and the shaft bolt (4) and the clamp (1) are engaged via the locking piece (25). Stopped,
The clamp (2) includes a spring (5) for applying an electric wire clamping force between the clamp (1) and the clamp (2) by loading on the fastening member (6, 7) on the end side of the shaft bolt (4). A pressing bolt (9) for pressing the end of the shaft bolt (4) to release the electric wire clamping force, and
The clamp (2) is connected to the cylindrical chamber (15) via the terminal (14),
The terminal (14) includes a flat plate clevis portion (28) attached to the clamp (2), and a columnar bolt neck portion (16) rotatably connected to the chamber (15).
An electric wire spacer provided with means for restricting the rotation angle in the mutual arrangement of the terminal (14) and the chamber (15) was obtained.
(2) In the wire spacer of (1),
The chamber (15) is provided with a stopper portion (22) protruding on the end face in the direction of the clamp (2).
The rotation angle with respect to the terminal (14) may be regulated by bringing the clevis portion (28) of the terminal (14) into contact with the stopper portion (22) of the chamber (15).

(3) A spacer frame (23) having the same number of connecting members (20) and chambers (15) as the number of electric wires to be gripped to form a polygonal shape, the same number of clamps (1) and clamps ( 2) an electric wire spacer comprising a shaft bolt (4), a spring (5), a push bolt (9), and a terminal (14),
The clamp (1) and the clamp (2) are configured to be openable and closable around the connecting pin (3), and an electric wire is sandwiched between them.
The shaft bolt (4) is arranged to penetrate the clamp (1) and the clamp (2),
A locking piece (25) is disposed at the end of the shaft bolt (4) on the clamp (1) side, and the shaft bolt (4) and the clamp (1) are engaged via the locking piece (25). Stopped,
The clamp (2) includes a spring (5) for applying an electric wire clamping force between the clamp (1) and the clamp (2) by loading on the fastening member (6, 7) on the end side of the shaft bolt (4). A pressing bolt (9) for pressing the end of the shaft bolt (4) to release the electric wire clamping force, and
The clamp (2) is connected to the cylindrical chamber (15) via the terminal (14),
The terminal (14) includes a flat plate clevis portion (28) attached to the clamp (2), and a columnar bolt neck portion (16) rotatably connected to the chamber (15).
The shaft bolt (4) and the locking piece (25) are electric wire spacers that are set so that the locking piece (25) can rotate in a direction perpendicular to the axis of the shaft bolt (4).
(4) In the wire spacer (3),
An interposition member (33) may be interposed between the shaft bolt (4) and the locking piece (25) to restrict mutual rotation.

Moreover, the following means may be used for the spacer for electric wires of this invention.
A boltless spacer for a transmission line suitable for the UHV transmission line of the present invention includes a boltless wire gripping portion (30), and the boltless wire gripping portion (30) includes clamps (1) and (2) that are connected to a connecting pin (3 ) Around the clamp, and the clamp bolt (4) and the clamp bolt (4) are loaded on the screw part side while holding the electric wire between the clamps (1) and (2). 5), the clamp (2) is pressed against the clamp (1), and the clamp (2) against the clamp (1) is pushed by the push bolt (9) that loads the bolt (4) to the locking piece (25) side. It is comprised so that the press of may be cancelled | released.

  The boltless spacer for power transmission line connects the same number of chambers (15) with a plurality of connecting rods (20) to form a regular polygonal frame (23), and the frame (15) The boltless wire gripping portion (30) is radially attached via the terminal (14) so as to be axially symmetric with respect to (23), the boltless wire gripping portion (30) is connected to the terminal (14), and the chamber (15 ), A rotation prevention stopper (22) for maintaining the normal assembly posture of the boltless wire gripping portion (30) is provided at a predetermined position of the chamber (15).

In the boltless spacer for power transmission lines, the anti-rotation stopper (22) has a substantially V-shaped raised shape and is provided opposite to two locations on the outer plane of the chamber (15), and the boltless wire gripping portion ( The locking piece (25) mounted on the head on the clamp (2) side of the shaft bolt (4) of 30) is configured to be rotatable in the horizontal direction with respect to the shaft bolt (4). On the head side of the shaft bolt (4), a locking piece (25) and a locking piece fixing sleeve (31) are screwed to the tip of the shaft bolt (4), and the locking piece fixing sleeve (31). The outer periphery is compressed and fixed to the shaft bolt (4).
In addition, a ring-shaped groove (32) is carved around the shaft bolt (4) at a place where the locking piece (25) is attached to the shaft bolt (4), and an O-ring (33) is provided at the place. A boltless spacer for a multi-conductor power transmission line, characterized in that it is configured so that it can be mounted to restrict the movement of the locking piece (25) and can be stopped at a desired position.

  In the boltless spacer of the present invention, the shaft bolt head is configured to be rotatable in the horizontal direction with a very simple mechanism, so even if a compression force is applied to the shaft bolt by a push screw, a special tool is not used. It can be manually cross-engaged with the long groove of the clamp. Accordingly, the spacer mounting operation at a high place can be made extremely easy.

  In addition, since the O-ring is attached to the pivoting portion of the shaft bolt and the locking piece, the locking piece is configured to be able to stand still at a desired position without loosely moving. The stop piece can be engaged with the long groove (24) at a right angle to provide a boltless spacer that is unlikely to cause poor construction.

In addition, since the rotation prevention stopper (22) for maintaining the normal assembly posture of the boltless wire gripping portion (30) is provided opposite to the two outer planes of the chamber (15), the direction of the boltless wire gripping portion is Since it can be attached to a normal attachment posture without being disjointed, it can be attached to the electric wire with good aesthetics regardless of the skill of the installer.
Also, check after installation, especially whether the long groove (24) of the clamp (2) and the T part of the bolt (4) are locked at a right angle as shown in FIG. Since inspection can be confirmed, it is possible to reliably eliminate construction defects.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIG. 1 is a front view of a boltless spacer for 8 conductors when the spacer of the present invention is applied to a UHV 8 conductor transmission line.
FIG. 2 is an enlarged cross-sectional view of the boltless gripping portion (30 ₁ ).
FIG. 3 is a front view of a 6-conductor boltless spacer for an ultrahigh-voltage transmission line or UHV transmission line.

First, the structure of the spacer according to the present invention will be described with reference to an example of a boltless spacer for 8-conductor. As shown in FIG. 1, the 8-conductor boltless spacer is formed by welding a connecting rod (20) to a cylindrical chamber (15) to form an 8-conductor frame. The eight chambers (15) are arranged at an angle of about 45 ° from the center of the frame (23) and spaced from each other, and the eight chambers (15) have grips (30 ₁ ) to (30 ₈ ) are mounted symmetrically and radially.

Note that the gripping portions (30 ₁ ) to (30 ₈ ) gripping the conductor C are shifted in the left-right direction from the axis line in order to avoid a decrease in corona characteristics. Here, the clamps (1) and (2) have a structure that can be opened and closed around the connecting pin (3), and the radius of curvature of the part is usually about R10 to R12 mm, and the part is clamped (2 If the radius of curvature is the same as the radius of curvature of the back surface of the wire (about R130 to 45 mm in the normal design for the above wire diameter), the thickness will increase and the weight of the gripping part will increase. Often designed with a small radius of curvature.

However, a spacer for a UHV transmission line has a higher potential gradient than a general transmission line. Therefore, if a portion having a projection with a small curvature radius is provided so as to coincide with the axial direction, raindrops and the like are generated particularly in rainy weather. It is easy to be formed at a location, and a sharper protrusion is formed to easily generate corona, which may be a source of pollution noise such as corona noise.
Therefore, in the present invention, the position of the connecting pin is displaced by θ from the axial direction where the potential gradient is highest, and the back surface portion of the clamp (2) where the radius of curvature of the axial portion can be increased is located. A design method to mitigate was adopted. A specific value of θ is preferably about 25 ° to 45 °.

FIG. 2 is an enlarged sectional view of the conductor gripping portion (30 ₁ ) of FIG. ₁ , and the function of the boltless clamp of the present invention will be described with reference to this sectional view.
The clamps (1) and (2) of the boltless electric wire gripping part (30) can be opened and closed with the connecting pin (3) as the center, and the electric wire is sandwiched between the clamps (1) and (2). The clamp (2) is pressed against the clamp (1) by the shaft bolt (4) and the tightening spring (5) that loads the shaft bolt (4) on the threaded portion side, and the bolt (4) is engaged with the locking piece ( 25) The push bolt (9) loaded on the side is configured to release the pressure of the clamp (2) from the clamp (1).

  A plurality of connecting rods (20) connect the same number of chambers (15) to form a regular polygonal frame (23), and the chamber (15) is axially symmetrical with respect to the frame (23). Thus, when the boltless wire gripping portion (30) is radially attached via the terminal (14) and the boltless wire gripping portion (30) is connected to the terminal (14) and assembled to the chamber (15), An anti-rotation stopper (22) for maintaining the normal assembly posture of the boltless electric wire gripping part (30) is provided at a predetermined position of the chamber (15).

As shown in FIG. 4, the anti-rotation stopper (22) has a fan-shaped or substantially V-shaped bulge that extends outward, and is opposed to two locations on the outer plane of the chamber (15). Is provided.
The locking piece (25) attached to the head of the boltless wire gripping part (30) on the clamp (2) side of the shaft bolt (4) is shown in detail in FIGS. Thus, the shaft bolt (4) is configured to be rotatable in the horizontal direction, and the head side of the shaft bolt (4) is provided with a locking piece (25) and a locking piece fixing sleeve (31). ) Is screwed to the tip of the shaft bolt (4), and the outer periphery of the locking piece fixing sleeve (31) is compressed and fixed to the shaft bolt (4).

In addition, an enlarged view of the portion A in FIG. 5 is shown in FIG. 6 at the place where the locking piece (25) is attached to the shaft bolt (4), but a ring-shaped groove ( 32) is sculpted, and an O-ring (33) is attached to the portion to restrict the looseness of the locking piece (25) and can be stopped at a desired position.
In addition, although the case where an O-ring was used was demonstrated above, it is not limited to this, A strip | belt-shaped band may be sufficient, and also in FIG. 6, instead of using an O-ring, although not shown, a locking piece (25) A disc spring or the like is interposed between the locking piece fixing sleeve (31) and the locking piece fixing sleeve (31) to increase the friction between the locking piece (25) and the locking piece fixing sleeve (31). You may not make it.

Next, a method for determining the effective tightening length (L _T ) of the shaft bolt for obtaining the required wire gripping force of the shaft bolt (4) will be described.
As shown in FIG. 7, with the electric wire (C) gripped, with the locking piece (25) crossing the long groove (24), the push bolt (9) is removed from the push bolt screw hole (29). When this occurs, it must have a predetermined gripping force (= the specified gripping force that does not cause slip between the boltless clamp and the electric wire when an external force is applied).
For this purpose, it is necessary to determine the effective tightening length (L _T ) of the shaft bolt shown in FIG.

In order to determine the effective tightening length (L _T ) of the shaft bolt, after mounting the O-ring (33) on the electric wire side of the shaft bolt (4), the locking piece (25) is mounted and the locking piece fixing sleeve ( 31) is screwed, and the locking piece fixing sleeve (31) is compressed from the outer peripheral direction and fixed to the shaft bolt (4) so that the locking piece (25) is movable in the horizontal direction.

Next, with the wire (C) gripped as shown in FIG. 7, the clamping spring (5), plain washer (6), and hexagon nut (7) are attached to the other end of the shaft bolt as shown in FIG. After mounting, the hexagon nut (7) is tightened until a predetermined gripping force is obtained, and this operation is carried out for a large number of boltless clamps, and an effective tightening length (L _T ) in consideration of variations in which the predetermined gripping force can be obtained. Is obtained in advance.
The above (L _T ) varies depending on the outer diameters of various electric wires. If these are also determined by the same method, after tightening the hexagon nut (7) to a predetermined position in the assembly process of the boltless clamp, If the nut fixing sleeve (8) is tightened to the hexagonal nut (7) and compressed and fixed, a boltless clamp having a stable gripping force can be obtained.

FIG. 8 shows the shape of the terminal (14) used in the boltless spacer of the present invention, wherein (a) is a plan view, (b) is a side view, and (c) is a bottom view. As can be seen from the figure, the portion (28 ₁ ) to be attached to the clevis portion (28) of the clamp (1) is flat and the bolt side (16 ₁ ) has a slightly wider shape. The reason for this is to ensure that the clamp (1) does not rotate excessively by hitting the anti-rotation stopper (22) shown in FIG. 4 in advance, and that the clamp should not be mounted in the wrong direction during construction. It also serves as a purpose. (18 ₁ ) is a threaded portion for mounting a grooved nut, and (19 ₁ ) is a split pin hole for mounting a split pin.
1 and 3, the push bolt (9) is removed when it is actually attached to the power transmission line.

[The invention's effect]
As described above, according to the boltless spacer for the UHV transmission line of the present invention, it has a remarkable effect as written.
1) Boltless gripping part assembled to the frame body is controlled by an anti-rotation stopper provided opposite to the chamber surface part, so that excessive looseness is not restricted during normal transportation and construction. Installation can be done reliably.
2) Since the locking piece of the shaft bolt can be rotated in the horizontal direction with respect to the shaft, a special tool is not required for locking in the long groove of the clamp (2). Workability is improved.

It is a front view of the boltless spacer for 8 conductors of this invention. It is an expanded sectional view of a boltless electric wire holding part. It is a front view of the boltless spacer for 6 conductors of this invention. It is a three-dimensional perspective view which shows the shape of the rotation (rotation) prevention stopper provided facing two outer surface surfaces of a chamber. It is a partial cutaway front view of the boltless electric wire holding part of the present invention. It is an expanded sectional view of the A section of FIG. FIG. 6 is a right side view of FIG. 5. (A) is a plan view, (b) is a right side view, and (c) is a bottom view. These are the front views of the boltless electric wire holding part of patent document 1. FIG. FIG. 10 is a right side view of FIG. 9. FIG. 3 is a perspective view of a T bolt. FIG. 3 is a partially cutaway front view of the electric wire gripping device of Patent Document 2. FIG. 13 is a partially cutaway front view showing details of the washer part shown in FIG. 12. FIG. 13 is a front view showing a state where an electric wire is held using the electric wire holding device shown in FIG. 12.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Clamp 3 Connecting pin 4 Shaft bolt 5 Clamping spring 6, 11, 17 Plain washer 7 Hexagon nut 8 Nut fixing sleeve 9 Push bolt 10 Connecting bolt 10 ₁ Connecting bolt hole 12 Buffer spring 13 Spring pin 14 Terminal 15 Chamber 16 Coil The spring 16 ₁ connecting bolt neck 18 grooved nut 18 ₁ grooved nut screwed part 19 split pin 19 ₁ split pin insertion hole 20 connecting rod (connecting member)
21 Upper display mark 22 Stopper (rotation) prevention stopper 23 Frame (spacer frame)
24 Long groove 25 Locking piece 26 U-shaped saddle portion 27 Cavity portion 28 Clevis portion 29 Push bolt screw hole 30, 30 ₁ to 30 ₈ Bolt-less electric wire gripping portion 31 Locking piece fixing sleeve 32 Ring-shaped groove 33 O-ring 1 ′ Boltless wire gripping part body 2 'Presser foot 3' Pin 4 'Electric wire 5' Through hole 7 'Nut 8' Washer 9 'Compression coil spring 10' Spring device 11 'U-shaped part 12' Screw hole 13 'Push screw 14' Connection Part 15 'Fork part 21' T bolt 21'a Screw part 21'b Screw member 21'c T part 100 Electric wire gripping device 1A Clamp body 1B Clamp lid 1C Storage space 1D Spring support part 1E Insertion hole 1F Bolt hole 1G Bolt Engagement section 1S slit 2A head section 2B rod-shaped section C1 first recess C2 second recess 6A insertion hole 102 T-shaped bolt 103 first spring 104 spring receiving section 105 push Screw 106 Spring support 107 Nut 108 Lid 109 Second spring 110 Hinge C, W Electric wire L Width of long hole L Effective tightening length of _T- axis bolt θ Deviation angle of pin from symmetrical axis

Claims (4)

The same number of connecting members (20) and chambers (15) as the number of wires to be gripped are joined together into a polygonal spacer frame (23), the same number of clamps (1) as the number of wires to be gripped, clamps (2), A wire spacer comprising a shaft bolt (4), a spring (5), a push bolt (9), and a terminal (14),
The clamp (1) and the clamp (2) are configured to be openable and closable around the connecting pin (3), and an electric wire is sandwiched between them.
The shaft bolt (4) is arranged to penetrate the clamp (1) and the clamp (2),
A locking piece (25) is disposed at the end of the shaft bolt (4) on the clamp (1) side, and the shaft bolt (4) and the clamp (1) are engaged via the locking piece (25). Stopped,
The clamp (2) includes a spring (5) for applying an electric wire clamping force between the clamp (1) and the clamp (2) by loading on the fastening member (6, 7) on the end side of the shaft bolt (4). A pressing bolt (9) for pressing the end of the shaft bolt (4) to release the electric wire clamping force, and
The clamp (2) is connected to the cylindrical chamber (15) via the terminal (14),
The terminal (14) includes a flat plate clevis portion (28) attached to the clamp (2), and a cylindrical bolt neck portion (16) rotatably connected to the chamber (15).
An electric wire spacer, characterized in that, in the arrangement of the terminal (14) and the chamber (15), a means for regulating the mutual rotation angle is provided. In the spacer for electric wires of Claim 1,
The chamber (15) is provided with a stopper portion (22) protruding on the end face in the direction of the clamp (2).
A wire spacer, characterized in that a rotation angle with respect to a terminal (14) is regulated by bringing a clevis part (28) of a terminal (14) into contact with a stopper part (22) of a chamber (15). The same number of connecting members (20) and chambers (15) as the number of wires to be gripped are joined together into a polygonal spacer frame (23), the same number of clamps (1) as the number of wires to be gripped, clamps (2), A wire spacer comprising a shaft bolt (4), a spring (5), a push bolt (9), and a terminal (14),
The clamp (1) and the clamp (2) are configured to be openable and closable around the connecting pin (3), and an electric wire is sandwiched between them.
The shaft bolt (4) is arranged to penetrate the clamp (1) and the clamp (2),
A locking piece (25) is disposed at the end of the shaft bolt (4) on the clamp (1) side, and the shaft bolt (4) and the clamp (1) are engaged via the locking piece (25). Stopped,
The clamp (2) includes a spring (5) for applying an electric wire clamping force between the clamp (1) and the clamp (2) by loading on the fastening member (6, 7) on the end side of the shaft bolt (4). A pressing bolt (9) for pressing the end of the shaft bolt (4) to release the electric wire clamping force, and
The clamp (2) is connected to the cylindrical chamber (15) via the terminal (14),
The terminal (14) includes a flat plate clevis portion (28) attached to the clamp (2), and a columnar bolt neck portion (16) rotatably connected to the chamber (15).
The shaft bolt (4) and the locking piece (25) are set so that the locking piece (25) can be rotated in a direction perpendicular to the axis of the shaft bolt (4). In the spacer for electric wires of Claim 3,
An electric wire spacer characterized in that an interposition member (33) is interposed between the shaft bolt (4) and the locking piece (25) to restrict mutual rotation.

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