JP2012039679A - Grounding hook - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a hook from unfastening an electric wire and the like by absorbing and alleviating shakes and impacts even when they are given to the hook through an electric wire with an insulation rod fixed to a steel tower and with the hook at the tip of the insulation rod fastening an electric wire and the like.SOLUTION: A grounding hook includes: an insulation rod 2; a coil spring 10 whose one end is fixed to a tip of the insulation rod; a tip part 20 relatively rotatably connected to the insulation rod through the coil spring; a hook part 30 supported by the tip part so as to be freely opened/closed between an open/close state; and a locking mechanism 50 to prevent or allow a relative rotation of the insulation rod and the tip part.

Description

  The present invention relates to an improvement of a power transmission line work protector called an earth hook.

Maintenance and inspection work performed on the steel tower after the power transmission line is in a power outage state is performed while grounding the power transmission line using a power transmission line work protector (Otsuno Earth) called an earth hook. By performing the work with the ground hook attached, it is possible to ensure the safety of workers in the event that current flows through the power transmission line in the event of a power failure.
The earth hook has an insulating rod (operating rod) made of an epoxy pipe, a metal hook member pivotally supported at the tip of the insulating rod, and an opening / closing mechanism for opening and closing the hook member by operating the operating means. And a ground wire with a grounding fitting connected to the hook member (Patent Document 1).

Further, as the operation means, there is commercially available one having a configuration in which an opening / closing mechanism is operated by rotating an insulating rod in a forward / reverse direction with respect to a hook member.
In the grounding work by the earth hook, the hook member is locked to the electric wire or metal fitting around the insulator attached to the armature of the steel tower, and the insulating rod is secured to the earth member of the steel tower with a wire or the like. The earth lead electrically connected to the earth member of the steel tower is connected. When the hook member is locked to the electric wire, etc., the hook is released by turning the insulating rod in the opening direction, and then the hook is closed by turning the insulating rod in the closing direction. Do. The opening / closing mechanism is configured to open or close the hook member by rotating the insulating rod by a manual operation by a human, or to lock the hook member in the open state or the closed state. The insulation rod does not rotate. For this reason, when an excessive force is applied to push the hook from the electric wire side with the hook member closed, the hook member may fall off the electric wire.

For example, when the hook member is locked to the electric wire, the opening and closing mechanism is locked so that the insulating rod fixed to the steel tower and the hook member do not rotate relative to each other. If the hook member vibrates or twists due to the vibration or impact when it rides, the stress tends to concentrate on the contact portion between the hook member and the electric wire, and a force is applied in the direction to open the hook member in the closed state. There is a possibility that the hook member may be detached from the electric wire.
If the hook member falls off the electric wire or metal fitting during maintenance or inspection work, there is a risk of a serious accident if the power transmission line is energized.

JP 2010-035305 A

As described above, in the conventional ground hook, when the hook member is locked to the electric wire or the like, the insulating rod fixed to the steel tower and the hook member are locked so as not to rotate relatively. If the wire or the like is subjected to vibration or impact while it is locked to the wire or the like and the insulating rod is fixed to the tower side, the hook member may fall off the wire and cause a serious accident.
The present invention has been made in view of the above. In the state where the insulating rod is fixed to the steel tower and the hook member at the tip of the insulating rod is locked to the electric wire or the like, vibration or impact is applied to the hook member from the electric wire or the like. Even if it is a case, it aims at absorbing a vibration and an impact and preventing a hook member from detaching from an electric wire or the like.

In order to achieve the above object, an invention according to claim 1 is directed to an insulating rod, a coil spring having one end fixed to the tip of the insulating rod, and a tip connected to the insulating rod via the coil spring so as to be relatively rotatable. A member, a hook member supported by the tip member so as to be openable and closable between an open posture and a closed posture, and a lock mechanism that prevents or allows relative rotation between the insulating rod and the tip member. It is characterized by that.
According to a second aspect of the present invention, the tip member includes a casing made of a metal pipe, a shaft member disposed so as to be relatively rotatable in the casing, and a hook member connected to the shaft member and built in the casing. An opening / closing mechanism that opens or closes, and the opening / closing mechanism is integrated with the female screw member disposed in the casing so as to be able to advance and retreat in the axial direction, and is integrated with the shaft member, and is screwed into the female screw member. A screw rod that advances and retracts the female screw member in the axial direction by rotating together, and an action member that is integrated with the female screw member and opens and closes the hook member when the female screw member advances and retracts in the axial direction. It is characterized by providing.
According to a third aspect of the present invention, there is provided an elastic member for urging the hook member in an opening direction or a closing direction.

In the present invention, by arranging the coil spring between the insulating rod and the tip member that pivotally supports the hook member so that it can be opened and closed, when the ground hook is fixed between the electric wire (metal fitting) and the steel tower, The stress in the twisting direction or the bending direction applied between the hook member (tip member) and the insulating rod is buffered by the coil spring, and the hook member can be prevented from being detached from the electric wire or the like.
Furthermore, if the coil spring is always operating effectively, the opening / closing mechanism cannot be operated by rotating the insulating rod. Therefore, by fixing or unfixing the tip member and the insulating rod, Relative rotation can be prevented at any time. Therefore, when opening and closing the hook member to lock the hook member of the ground hook to the electric wire or the like, or opening the hook member to remove the hook member locked to the electric wire from the electric wire, the tip member And the insulating rod are locked in a fixed state to invalidate the coil spring.

(A) is explanatory drawing which shows the whole structure (unlocked state) of the earth hook (power transmission line work protector) which concerns on one Embodiment of this invention, (b) is the locked state of an insulating rod and a front-end | tip member. It is a principal part block diagram shown, (c) is a perspective view which shows the structure of a locking mechanism. (A), (b) and (c) are an enlarged view, a right side view, and a left side view of a main part (opening / closing mechanism) of the ground hook showing an open state of the hook member. (A) (b) And (c) is an enlarged view, a right side view, and a left side view of a main part (opening / closing mechanism) of the ground hook showing a closed state of the hook member. These are the schematic diagrams which show the state which attached the earth hook of this invention between the steel tower and the insulator.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
Fig.1 (a) is explanatory drawing which shows the whole structure (unlocked state) of the earth hook (power transmission line work protective equipment) which concerns on one Embodiment of this invention, (b) is a lock | rock with an insulation rod and a front-end | tip member. It is a principal part block diagram which shows a state, (c) is a perspective view which shows the structure of a locking mechanism. 2A, 2B, and 2C are an enlarged cross-sectional view, a right side view, and a left side view of a main part (opening / closing mechanism) of the ground hook showing an open state of the hook member, and FIG. FIGS. 4A and 4B are an enlarged cross-sectional view, a right side view, and a left side view of a main part (opening / closing mechanism) of the ground hook showing a closed state of the hook member, and FIG. 4 is a ground hook of the present invention. It is the schematic which shows the state which attached to between the steel tower and the insulator.

The ground hook 1 includes an insulating rod 2 made of an insulating material such as an epoxy pipe having a grip portion (fixed portion) 3 at a base end portion, a coil spring 10 having one end fixed to the tip of the insulating rod 2, and a coil spring 10 A distal end member 20 connected to the distal end of the insulating rod via a shaft and a shaft portion (bolt) 21 provided on the distal end member 20 between an open posture (FIG. 2) and a closed posture (FIG. 3). A metal hook member 30 supported in an openable / closable manner, the insulating rod 2 and the tip member 20 are detachably connected to each other to prevent or allow relative rotation between them, and the tip member 20 And a grounding lead wire 60 having one end electrically connected thereto.
The tip member 20 includes a casing 22 made of a metal pipe, a shaft member 25 disposed in the casing 22 so as to be relatively rotatable, and is connected to the shaft member 25 and built in the casing 22 to open or close the hook member 30. And an opening / closing mechanism 40.
The shaft member 25 has a rear end portion 25 a protruding from the front end opening of the coil spring 10 into the shaft member 25, and the front end portion of the coil spring is fixed to the shaft member 25. Further, the front end portion 2a of the insulating rod 2 is protruded into the inside from the rear end opening of the coil spring, and the rear end portion of the coil spring is fixed. A lock mechanism 50 is provided at the rear end portion 25a of the shaft member 25 and the distal end portion 2a of the insulating rod to lock (unlock) the two portions and release the lock. The shaft member 25 has a circumferential groove 26 formed in the circumferential direction on the outer periphery thereof, and the guide member 23 provided in the casing 22 is fitted in the circumferential groove 26 to move in the axial direction with respect to the casing 22. The shaft member 25 is configured to be relatively rotatable along the guide member 23 while being supported in an impossible manner.

The opening / closing mechanism 40 is integrally and integrally connected to the distal end portion of the shaft member 25 and the female screw member 42 disposed in the casing 22 so as to be able to advance and retreat in the axial direction, and is screwed to the female screw member 42. A screw rod 44 that advances and retracts the female screw member in the axial direction by rotating together, and an action member 46 that is integrated with the female screw member 42 and opens and closes the hook member 30 when the female screw member advances and retracts in the axial direction. An elastic member (for example, a torsion spring) (not shown) that urges the hook member 30 in the opening direction or the closing direction (the opening direction in the present embodiment), and the insulating rod 2 and the shaft member 25 by the lock mechanism 50. Is configured so that the forward / reverse rotational force of the insulating rod 2 is reliably transmitted to the screw rod 44 to rotate the screw rod forward / reversely. In other words, when the lock mechanism 50 separates the insulating rod 2 and the shaft member 25, since the insulating rod and the shaft member are connected via the coil spring 10, the rotational force from the insulating rod is transmitted via the coil spring. Is transmitted to the shaft member 25.
The female screw member 42 is a pipe disposed so as to be capable of moving back and forth in the axial direction along the inner periphery of the casing 22, and has a female screw portion that engages with the male screw portion of the screw rod 44 on the inner periphery thereof. Since the screw rod 44 is supported by the guide member 23 so as to be rotatable and immovable in the axial direction with respect to the casing, the screw rod 44 is rotated in the forward direction shown in FIG. When rotating in the direction (closing direction), the female screw member 42 moves in the casing 22 in the distal direction. The action member 46 integrated on the distal end side of the female screw member 42 urges the hook member in the closing direction when the acting part 31 of the hook member 30 is pressed by the shoulder part 46a.
On the other hand, when the screw rod 44 rotates in the reverse direction (opening direction) shown in FIG. 3A, the female screw member 42 moves rearward in the casing 22. At this time, since the shoulder portion 46a of the action member 46 integrated on the distal end side of the female screw member 42 is retracted rearward, the force of the elastic member that constantly biases the hook member in the opening direction is released, and the hook member is released. Operate in the opening direction.

The lock mechanism 50 is a means for locking (unifying) or unlocking the rear end portion 25a of the shaft member 25 and the front end portion 2a of the insulating rod, and in this example, the pipe-shaped rear end of the shaft member A substantially L-shaped slit 52 formed at the edge of the portion 25a, a small-diameter fitting portion 54 provided in the insulating rod front end portion 2a and fitted in the rear end opening of the shaft member rear end portion 25a, And an engaging pin 56 that protrudes from the outer periphery of the fitting portion 54 in the outer diameter direction and engages with the slit 52. The slit 52 includes a portion 52a extending in the axial direction, a portion 52b extending in the circumferential direction, and a portion 52c bent further in the axial direction.
As shown in FIG. 1C, the fitting portion 54 at the front end of the insulating rod is pushed into the opening of the shaft member rear end 25a against the coil spring 10, and the engagement pin 56 is inserted into the slit 52 to terminate. By moving to the portion 52c, it will not come off due to the force of the coil spring. In this locked state, by rotating the insulating rod 2 forward and backward with respect to the tip member 20, the opening / closing mechanism 40 can be operated to open / close the hook member 30.
Further, when the insulating rod 2 is rotated forward and backward with respect to the distal end member 20 in the unlocked state in which the shaft member rear end portion 25a and the insulating rod distal end portion 2a are separated from each other, within the range of the elastic force of the coil spring 10. Then, the rotational torque is transmitted to the rear end portion 25a of the shaft member and the opening / closing mechanism 40 is operated to open / close the hook member 30. However, when a large torque exceeding the elastic force is applied, the coil spring 10 is twisted. Since it is deformed and buffered, the torque from the insulating rod is not directly transmitted to the shaft member rear end portion 25a.

When the earth hook 1 having the above configuration is installed in a steel tower, as shown in FIG. 4, while the rear end portion of the insulating rod 2 is secured to the arm metal 100 of the steel tower with a rope or the like, The member is locked to the metal fitting 104 (or the electric wire 106) at the end of the insulator 102, and the grounding lead wire 60 is connected to a grounding member (not shown) of the steel tower.
The hook member 30 opens and closes around the shaft portion 21 by rotating the insulating rod 2 forward and backward with respect to the tip member 20. The opening / closing operation of the hook member is performed in a state where the insulating rod 2 is locked to the shaft member 25 by the lock mechanism 50.
When the hook member 30 is open as shown in FIG. 2, the electric wire 106 is inserted into the gap between the hook member and the tip member 20, and in this state, the insulating rod 2 is rotated in the forward direction shown in FIG. Turn to. Then, the female screw member 42 moves in the distal direction, the shoulder 46a of the action member 46 presses the acted part 31 of the hook member 30 in the closing direction, and the hook member 30 in the open position as shown in the drawing is elastic member. The wire can be locked between the hook member 30 and the casing 22 of the tip member as shown in FIG.
With the hook member 30 closed and the electric wire locked, the end of the insulating rod is secured to the arm metal 100, and then the lock mechanism 50 is brought into the unlocked state, so that the coil spring 10 becomes effective and has a buffering action. It can be demonstrated. Accordingly, when various stresses are applied to the hook member 30 from an electric wire or the like, the coil spring 10 exhibits a buffering action, and the relative movement between the tip member 20 and the insulating rod 2 becomes free. Even if an excessive load concentrates during this period, the hook member can be prevented from being detached from the electric wire.

  On the other hand, when the inspection and maintenance work is completed and the ground hook is removed, the hook member 30 in the closed state is opened as shown in FIG. What is necessary is just to remove the edge part. When opening the hook member, an operation for opening is performed in a state where the lock mechanism 50 is in the locked state. In the opening operation, the female screw member 42 moves rearward by rotating the insulating rod 2 in the reverse direction, so that the shoulder portion 46 moves away from the actuated portion 31 and the elastic member is released. The member 30 is rotated in the opening direction by the force of the elastic member. For this reason, the hook member can be easily detached from the electric wire.

As described above, in the present invention, by arranging the coil spring between the insulating rod and the tip member that pivotably supports the hook member, the ground hook is fixed between the electric wire (metal fitting) and the steel tower. At that time, the stress in the twisting direction or the bending direction applied between the hook member (tip member) and the insulating rod is buffered by the coil spring, so that the hook member can be prevented from being detached from the electric wire or the like.
Furthermore, if the coil spring is always operating effectively, the opening / closing mechanism cannot be operated by rotating the insulating rod. Therefore, by fixing or unfixing the tip member and the insulating rod, Relative rotation can be prevented at any time. Therefore, when opening and closing the hook member to lock the hook member of the ground hook to the electric wire or the like, or opening the hook member to remove the hook member locked to the electric wire from the electric wire, the tip member And the insulating rod are locked in a fixed state to invalidate the coil spring.
The lock mechanism may have any structure as long as the insulating rod and the tip member can be arbitrarily locked or unlocked, and is not limited to the structure shown in FIG.
Further, an elastic member that urges the hook member in the opening direction or the closing direction is not essential, and the hook member may be opened and closed only by a rotational torque obtained by rotating the insulating rod forward and backward.

DESCRIPTION OF SYMBOLS 1 ... Ground hook, 2 ... Insulating rod, 2a ... Tip part, 3 ... Grip part (fixed part), 10 ... Coil spring, 20 ... Tip member, 21 ... Shaft part, 22 ... Casing, 23 ... Guide member, 25 ... Shaft member, 25a ... rear end, 26 ... circumferential groove, 30 ... hook member, 40 ... opening / closing mechanism, 42 ... female screw member, 44 ... screw rod, 46 ... action member, 46a ... shoulder, 50 ... lock mechanism, 52 ... Slit, 54 ... Fitting part, 56 ... Engagement pin

Claims (3)

  An insulating rod, a coil spring having one end fixed to the tip of the insulating rod, a tip member connected to the insulating rod via the coil spring so as to be relatively rotatable, and an opening posture and a closing posture by the tip member An earth hook comprising: a hook member supported so as to be openable and closable; and a lock mechanism for preventing or allowing relative rotation between the insulating rod and the tip member. The tip member includes a casing made of a metal pipe, a shaft member disposed in the casing so as to be relatively rotatable, and an opening / closing mechanism connected to the shaft member and incorporated in the casing to open or close the hook member. And comprising
The opening / closing mechanism is integrated with the female screw member disposed in the casing so as to be capable of moving back and forth in the axial direction, and is integrated with the shaft member, and is screwed into the female screw member and rotated to rotate the female screw member. 2. A screw rod that advances and retracts in an axial direction; and an action member that is integrated with the female screw member and opens and closes the hook member when the female screw member advances and retracts in the axial direction. Earth hook described.   The ground hook according to claim 2, further comprising an elastic member that biases the hook member in an opening direction or a closing direction.

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