JP2013026071A - Earth hook - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent pinching and holding force of a hook member for wires from lowering during operation to return an insulating rod toward a hook unit member opening direction, as for a type of an earth hook in which the insulating rod needs to be slightly returned toward the hook member opening direction after fixing the hook member.SOLUTION: When rotating the insulating rod 2 in one direction with rotation of a tip unit 20 stopped during an open state of the hook member 22, a lock pin 3 moves in one direction in a circumferential slit 13b to rotate a base end unit in one direction. Thereby, a hook member opening and closing mechanism 40 closes the hook member, and a latch mechanism 60 locks a portion to be locked 61 in the tip unit 20 and a latch member 63 having a locking portion meshed with the portion to be locked at the tip part thereof and an actuation piece 65 at the rear end part thereof with the latch member projected ahead when the hook member is in a closed state to lock the locking portion to the portion to be locked, and allows the insulating rod to rotate in the other direction while maintaining the locked state.

Description

  The present invention relates to an improvement of a protective device for power failure work called an earth hook.

The work of maintaining and inspecting electrical equipment in a state where a power failure occurs at an electrical station such as a substation is carried out while grounding the electrical circuit using a protective device called an earth hook. By performing the work with the ground hook attached, it is possible to ensure the safety of the worker in the event of a current flowing in the electric circuit of the kite in the event of a power failure.
The ground hook disclosed in Patent Document 1 is an insulating rod (operation rod) made of an epoxy pipe or the like, a metal hook member pivotally supported at the tip of the insulating rod so as to be openable and closable, and the insulation rod is advanced and retracted in the axial direction. An opening / closing mechanism that includes operating means that is freely supported and that opens and closes the hook member by operating the operating means in the axial direction, and an earth wire with a grounding fitting connected to the hook member.
In addition, a hook unit having a hook member at the tip of the insulating rod is attached to be relatively rotatable and detachable, and the hook is operated by rotating the insulating rod in the forward and reverse directions with respect to the hook unit to operate the opening / closing mechanism. The thing provided with the structure which opens and closes a member is marketed.

FIG. 6 is a diagram for explaining the configuration of this type of ground hook. By fitting the base end opening of the hook unit 110 to the outer periphery of the tip end of the insulating rod 100, the hook unit 110 is rotated with respect to the insulating rod. I can move. Further, the distal end of the insulating rod is configured to be able to be pulled out in the axial direction from the proximal end opening of the hook unit 110.
The hook unit 110 includes a proximal end portion 111 and a distal end portion 120 that is rotatably supported relative to the distal end of the proximal end portion. One end of the base end portion 111 is open, and the tip of the insulating rod is detachably fitted into the opening. A T-shaped notch 113 is provided at one end edge of the base end 111, and a locking pin 115 protruding from the outer periphery of the insulating rod tip is fitted into the notch 113. The distal end portion 120 is pivotally supported by a base portion 122 attached so as to be rotatable relative to the base end portion 111 and a pivot shaft 122a provided on the base portion 122 so that one end thereof is pivotable in the vertical direction. A hook member 124 and a holding piece 126 fixed to the base portion 122 for holding and holding the electric wire W between the hook member are provided. In addition, a screw rod 128 is disposed inside the base portion 122 so as to be able to advance and retreat in the axial direction, and the tip end portion of the screw rod 128 is located at an appropriate position of the hook member 124 (a position closer to the tip end of the hook member than the rotating shaft 122a). Is engaged with the engaging portion 122b provided on the inner portion of the engaging portion 122b so as to be rotatable and unremovable. Further, the lower portion of the screw rod 128 extends into the base end portion 111 and is screwed with a female screw portion 111a formed on the front end surface of the base end portion.
One end of a ground wire 130 is connected to the base end 111.

As shown in the drawing, with the base end portion 111 attached to the distal end of the insulating rod so that the locking pin 115 fits in the circumferential slit 113a of the notch 113, the insulating rod 100 is moved to the left with respect to the hook unit 110. When rotating in the direction, the locking pin 115 located at the neutral position moves leftward in the circumferential slit 113a and presses the left end portion of the circumferential slit 113a in the same direction to rotate the base end portion. For this reason, the screw rod 128 screwed with the female screw portion 111a at the base end portion is pushed in the distal direction to push up the engaging portion 122b to open the hook member 124. Further, when the insulating rod is rotated rightward and the locking pin 115 is pressed against the right end of the circumferential slit 113a in the same direction, the screw rod 128 is retracted to the base end side, so that the hook member 124 is closed. Rotate.
In the grounding work using the ground hook of the type in which the hook unit is detachably supported by the insulating rod as described above, the insulating rod 100 is rotated in the opening direction and the hook member 124 is opened, so that the electric wire, metal fitting, etc. After the contact, the hook is closed by rotating the insulating rod in the closing direction to hold and hold the electric wire or the like. After the hook member is locked to the electric wire or the like, the insulating rod is removed from the hook unit, and the ground wire 130 extending from the hook unit is connected to a ground member (not shown).

By the way, in order to remove the insulating rod from the hook unit after the hook member is locked to the electric wire or the like by rotating the insulating rod 100 in the closing direction, the engagement that is in contact with the left end portion of the circumferential slit 113a. By returning the stop pin 115 to the neutral position as shown in the drawing and pulling out the insulating rod from the base end opening in this state, the locking pin can be detached from the cutout portion 113 via the axial slit 113b.
However, in order to pull out the insulating rod from the hook unit, an operation for returning the insulating rod in the direction in which the hook member is released is necessary. When this return operation is performed, the hook member is rotated in the opening direction to pinch the electric wire. Looseness is easily generated in the pressure holding force. When the force for holding and holding the electric wire is loosened, the hook member turns around the electric wire, and the fixing angle of the hook unit with respect to the electric wire is easily changed. If there is a shift in the hook unit's fixing angle with respect to the electric wire when the electric wire is clamped and held by the hook member, an insulating rod may be inserted into the base end opening to remove the ground unit from the electric wire after maintenance and inspection work is completed. It can be difficult. In particular, in power outage work in electrical equipment at an electric power station, there are many cases in which a hook member is fixed to an electric wire or the like in a narrow gap between devices, but the hook member is connected to the electric wire through the narrow gap. If the angle of the entire hook unit with respect to the electric wire is slightly shifted after the insulating rod is removed after fixing, it becomes difficult to reattach the insulating rod to the hook unit at the end of the work due to a gap. For this reason, it becomes difficult to perform the work of removing the ground hook by rotating the insulating rod in the opening direction to open the hook member.
In addition, if the hook member falls off the electric wire or metal fitting during maintenance and inspection work, a serious accident may occur if the power transmission line is energized.

JP 2010-35305 A

As described above, in the case of a ground hook of the type in which an insulating rod is detachably attached to the hook unit and is pivotable, the hook is hooked on an electric wire or the like, and then the insulating rod is rotated in the closing direction. While the hook member is fixed to the electric wire by the above method, in order to remove the insulating rod from the hook unit after the hook member is fixed, it is necessary to slightly return the insulating rod in the hook member opening direction. For this reason, the return operation causes slack in the fixing force between the hook member and the electric wire, the angle of the hook unit with respect to the electric wire changes, and the work of reattaching the insulating rod to the hook unit may become difficult.
The present invention has been made in view of the above, and in an earth hook of a type in which it is necessary to slightly return the insulating rod in the hook member opening direction in order to remove the insulating rod from the hook unit after the hook member is fixed. An object of the present invention is to provide a ground hook that can prevent the holding force of the hook member against the electric wire or the like from being lowered during the operation of returning the hook unit member to the opening direction.

In order to achieve the above object, an earth hook according to the invention of claim 1 includes an insulating rod and a hook unit for fitting the rear end opening to the outer periphery of the tip of the insulating rod so as to be detachable and relatively rotatable. And a ground wire connected to the hook unit, wherein the hook unit has a proximal end unit having the opening at the rear end and a distal end of the proximal end unit. A distal end unit that is freely supported and supports the hook member so as to be freely opened and closed, and a hook member opening and closing mechanism that opens and closes the hook member when the base end unit is rotated in two forward and reverse directions with respect to the distal end unit. A latch mechanism that allows or prevents relative rotation of the base unit with respect to the tip unit, and the rear end edge of the base unit has an axial direction extending axially forward from the rear end edge A T-shaped notch portion comprising a lit and a circumferential slit extending in both circumferential directions from the tip end of the axial slit is provided, and a locking pin protruding from the outer periphery of the insulating rod tip is provided in the notch portion. The distal end unit is movably fitted, and the rear end is rotated in the opening and closing direction by a base portion that is rotatably attached to the base end unit and a rotation shaft provided on the base portion. The hook member rotatably supported by the hook member, and a holding piece provided on the base portion for holding the object to be attached between the hook member, and within the opening of the base unit. When the tip of the insulating rod is fitted and when the insulating rod is rotated in one direction with the tip unit being rotated when the hook member is in an open state, the locking pin is in the circumferential slit. Moving the one direction to the proximal end By pressing the knit and rotating it in the one direction, the hook member opening / closing mechanism closes the hook member, and when the hook member is in the closed state, the tip unit is rotated and the insulating rod is rotated. When the locking pin is rotated in the other direction, the hook pin opening mechanism moves in the circumferential slit in the other direction, presses the proximal end unit and rotates in the other direction, so that the hook member opening / closing mechanism is The hook member is opened, and the latch mechanism is supported by a locked portion formed along a circumferential direction on the outer periphery of the rear end edge of the distal end unit, and supported by the proximal end unit so as to be movable back and forth in the axial direction, and A latch member having a lock portion meshing with the locked portion at the front end portion and an operating piece at the rear end portion; a first elastic member for biasing the latch member toward the locked portion; Said When the lock member is in the closed state, the latch member is locked in a state of protruding forward to lock the lock portion with the locked portion, and the insulating rod is moved in the other direction while maintaining the lock state. It is characterized in that it can be rotated to the right.
In the process of closing the hook member in the open state, since the lock between the lock portion and the locked portion of the latch member can be once released, the hook member is rotated in the closing direction until the object to be attached is firmly held and held. On the other hand, even if the insulating rod is slightly rotated in the hook member opening direction in order to remove the insulating rod from the opening of the proximal unit, the latch portion of the latch member immediately locks with the locked portion. The fixing force between the hook member and the attachment object is not weakened.

According to a second aspect of the present invention, the latch mechanism further includes a sliding contact surface that is in sliding contact with the rear end portion of the operating piece, and a plurality of unlocking fitting portions that fit the rear end portion. A piece, and a piece to be pressed that is in contact with the locking pin that extends backward from both ends in the circumferential direction of the sliding piece and protrudes into the circumferential slit, and is capable of moving back and forth in the circumferential direction. An action member; and a second elastic member that holds the action member in a neutral circumferential position and has a resilient force stronger than that of the first elastic member, and the locking pin includes the axial slit. Since the rear end portion of the operating piece is in contact with the sliding contact surface, the lock portion is locked with the locked portion when the actuator is at a neutral position that is an intersection of the circumferential slit and the operation portion. When the rear end of the piece is fitted in the fitting part The lock portion is unlocked from the locked portion, and when the locking pin moves in the circumferential direction from the neutral position and moves the action member in the circumferential direction for a predetermined length, When the end portion is fitted in one of the fitting portions and the locking pin moves in a direction to return to the neutral position, the action member moves in a direction to return to the neutral position by the force of the second elastic member. Then, the rear end portion of the operating piece separates from the fitting portion and rides on the rubbing surface.
The locking and unlocking operations by the latch mechanism are performed in such a manner that the rear end portion of the operating piece of the latch member rides on the sliding contact surface provided on the operating member or the sliding is performed in the process in which the locking pin advances and retracts the operating member in the circumferential direction. This is realized by fitting into the fitting portion from the contact surface. This operation is smoothed by setting the force for returning the acting member to the neutral position by the second elastic member to be larger than the force for urging the latch member in the locking direction by the first elastic member.

According to a third aspect of the present invention, when the rear end portion of the operating piece is fitted in the fitting portion, the rear end of the operating piece is moved when the locking pin moves to the side opposite to the neutral position. A step portion is provided that prevents the portion from being detached from the fitting portion.
After the locking pin moves in one direction from the neutral position and the rear end of the operating piece of the latch member is fitted in the fitting portion, the operating piece is further pushed in the same direction by the locking pin. The rear end portion may be detached from the fitting portion. Therefore, a step portion that prevents the rear end portion of the operating piece from being detached from the fitting portion is provided.

According to a fourth aspect of the present invention, the locking pin is further moved in the same direction after the rear end portion of the operating piece is fitted into the one fitting portion by the movement of the locking pin in the circumferential direction. When the base end unit is rotated in the same direction to operate the hook member opening / closing mechanism to rotate the hook member in the closing direction and to move the locking pin in the reverse direction, the rear end portion of the operating piece Is separated from the one fitting portion and rides on the sliding surface.
By interlocking the latch mechanism and the hook member opening / closing mechanism, after the hook member is closed and the object to be attached is clamped and held, the operation is performed by moving the insulating rod slightly in the hook member opening direction. The closed state of the member can be locked, and the insulating rod can be detached from the proximal unit. At this time, since the holding force for holding the electric wire or the like by the hook member does not decrease, the angle of the hook unit with respect to the electric wire or the like can be prevented from changing.

According to a fifth aspect of the present invention, the hook member opening / closing mechanism is disposed inside the base portion so as to be capable of moving forward and backward in the axial direction, and the tip is provided closer to the tip of the hook member than the pivot shaft of the hook member. A screw member that is rotatably coupled to the engaging portion and whose rear portion is screwed with a threaded portion formed in the base end unit is fitted, and the tip of the insulating rod is fitted into the opening of the base end unit And when the insulating rod is rotated in one direction with the tip unit being rotated when the hook member is in the open state, the locking pin moves in the circumferential slit in the one direction. The base end unit is pressed and rotated in the one direction, so that the screw member moves rearward due to the rotation of the screwed portion, and the engaging portion is lowered rearward to move the hook member. Closed, and the hook member is in a closed state. When the insulating rod is rotated in the other direction with the distal end unit being rotated, the locking pin moves in the other direction in the circumferential slit to press the proximal end unit and By rotating in the other direction, the screw member is moved forward by the rotation of the screwed portion, and the engaging portion is pressed forward to release the hook member.
By adopting such a hook member opening / closing mechanism using a screw member, the hook member can be effectively opened / closed, locked and unlocked with a compact configuration.

In the present invention, in the ground hook in which the insulating rod is detachably attached to the hook unit, the hook unit is composed of a tip unit that supports the hook member and a base end unit that rotates relative to the tip unit, and a latch mechanism. Thus, the relative rotation of the proximal end unit with respect to the distal end unit is allowed or prohibited. The insulating rod was configured to be detachable in the rear end opening of the base unit. In order to pull out the insulation rod from the proximal unit after tightening while the insulation rod can be tightened until the hook member firmly clamps the electric wire etc. by the action of the latch mechanism when the insulation rod is rotated in the closing direction of the hook member Even if the insulating rod is slightly rotated in the hook member opening direction, the hook member can be locked in the closed position without loosening the hook member.
By providing the latch mechanism, even when the hook member is closed and fixed to the electric wire or the like and then rotated in the loosening direction to extract the insulating rod, the fixing force of the electric wire by the hook member is prevented from decreasing. For this reason, the angle of the hook unit with respect to the electric wire does not change, and there is no inconvenience when attaching the insulating rod to the hook unit later.
In other words, when closing the hook member, it can be rotated in the closing direction until the electric wire or the like can be firmly fixed, but when removing the insulating rod after fixing, the hook member loosens and the electric wire and the hook The angle with the unit will not change. As a result, it becomes easy to reattach the insulating rod to the hook unit.

(A) And (b) is a front view which shows the neutral state of the earth hook which concerns on one Embodiment of this invention, and XX sectional drawing. It is a front view which shows the hook member closed state in the ground hook. It is a front view which shows the state which closed and locked the hook member. It is a perspective view which shows the structure of a latch mechanism. It is composition explanatory drawing of the hook member opening / closing mechanism in the earth hook of this invention. It is structure explanatory drawing of the conventional earth hook.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
1A and 1B are a front view showing a neutral state of an earth hook according to an embodiment of the present invention, and an XX cross-sectional view, and FIG. 2 shows a hook member closed state of the earth hook. FIG. 3 is a front view showing a state in which the hook member is closed and locked, FIG. 4 is a perspective view showing a configuration of a latch mechanism, and FIG. 5 is a view showing opening and closing of the hook member in the ground hook of the present invention. It is structure explanatory drawing of a mechanism.

The ground hook 1 includes an insulating rod 2 made of an insulating material such as an epoxy pipe, a hook unit 10 that allows the rear end opening 12 to be attached to the outer periphery of the tip end of the insulating rod so as to be detachable and relatively rotatable, and a hook. And a ground wire (ground lead wire) E connected to the unit.
The hook unit 10 includes a proximal end unit 11 having an opening 12 at the rear end, a distal end unit 20 that is rotatably supported at the distal end of the proximal end unit 11 and supports a hook member 22 so as to be opened and closed, and a distal end unit. A hook member opening / closing mechanism 40 that opens and closes the hook member 22 when the base end unit is rotated in two forward and reverse directions with respect to 20, and a relative rotation of the base end unit 11 with respect to the distal end unit 20; And a latch mechanism 60 that prevents relative rotation.
The rear end edge of the base end unit 11 has a T-shaped notch including an axial slit 13a extending axially forward from the rear end edge and a circumferential slit 13b extending in both circumferential directions from the distal end of the axial slit. A portion 13 is provided, and a locking pin 3 protruding from the outer periphery of the end of the insulating rod is fitted in the notch portion so as to be movable in the notch portion 13. Since the locking pin 3 is integrated with the insulating rod 2, the locking pin 3 moves in the circumferential slit 13 b by rotating the insulating rod left and right in the circumferential direction while preventing the rotation of the tip unit 20. The base end unit 11 is rotated left and right by reciprocating in the circumferential direction and pressing both end edges of the circumferential slit. In this example, the locking pin 3 moves in the right direction (hook member closing direction) and presses the right end edge of the circumferential slit 13b in the right direction so that the proximal end unit 11 is moved to the right of the illustrated position (neutral position). By moving in the direction, the hook member opening / closing mechanism 40 operates in the closing direction to rotate the hook member 22 in the open state in the closing direction. On the other hand, the locking pin 3 moves leftward (hook member opening direction), presses the left end edge of the circumferential slit 13b leftward, and moves the proximal end unit 11 leftward from the illustrated position. The hook member opening / closing mechanism 40 operates in the opening direction to rotate the hook member in the closing position in the opening direction.
As the locking pin 3 moves to the left and right, the latch mechanism 60 also performs a predetermined operation (locking and unlocking).
It should be noted that the locking pin presses the left edge of the circumferential slit 13b to the left, and the base end unit is set in a predetermined direction, rather than the opening angle of the hook member 22 when the locking pin 3 is in the neutral position shown in FIG. The opening angle (shown by a broken line) when rotated to the limit position is larger.

The distal end unit 20 is disposed substantially in the same axial center as the proximal end unit 11, and is attached to the base portion 21 so as to be rotatable relative to the proximal end unit about the axial center. In order to hold the object W to be attached such as an electric wire or a metal fitting between the hook member 22 and the hook member 22 pivotally supported so that the rear end thereof is freely rotatable in the opening / closing direction by the rotation shaft 21a provided in And a holding piece 23 fixed to the outside of the base portion 21. Since the rotation shaft 21a extends in a direction orthogonal to the central axis direction of the tip unit, the opening / closing path of the hook member 22 is in a direction along a plane orthogonal to the rotation shaft 21a.
One end of the insulating rod 2 is fitted in a state in which the tip of the insulating rod is fitted in the opening 12 of the proximal end unit 11 and the tip unit 20 is not rotated when the hook member 22 is in an open state (for example, the state shown in FIG. 1). When rotating in the direction (right direction = hook member closing direction), the locking pin 3 moves in the circumferential slit 13b in the one direction and presses the proximal end unit 11 (circumferential slit right edge) to the right. By rotating in the direction, the hook member opening / closing mechanism 40 operates in the closing direction to rotate the hook member in the closing direction (counterclockwise direction).

In addition, when the insulating rod is rotated in the other direction (left direction = hook member opening direction) with the tip unit 20 being rotated when the hook member 22 is in the closed state, the locking pin 3 is moved into the circumferential slit 13b. Is moved in the other direction and the base end unit (the left end edge of the circumferential slit) is pressed and rotated leftward, whereby the hook member opening / closing mechanism 40 is operated in the opening direction to release the hook member (clockwise). Rotate in the rotation direction).
As shown in FIG. 5, the hook member opening / closing mechanism 40 includes a screw rod 41 supported by a screw guide (female screw) 42 fixed in the tip unit 20 so as to be movable back and forth in the axial direction. Is engaged with an engaging portion 21b provided at an appropriate position of the hook member 22 (a position closer to the tip of the hook member than the rotating shaft 21a) so as to be rotatable and detachable. Further, the lower portion of the screw rod 41 extends into the proximal end unit 11 and is screwed with a female screw portion 11a fixedly disposed on the distal end surface of the proximal end unit.
As shown in the drawing, the base end unit 11 is attached to the tip of the insulating rod so that the locking pin 3 fits in the circumferential slit 13b of the notch 13, and the rotation of the tip unit 20 is prevented. When the base end unit 11 is rotated leftward using the screw, the locking pin 3 located at the neutral position moves leftward in the circumferential slit 13b and presses the left end of the circumferential slit 13b in the same direction. To rotate the base unit. For this reason, the screw rod 41 screwed with the female screw portion 11a of the base end unit is pushed out in the distal direction and pushes up the engaging portion 21b to rotate the hook member 22 in the opening direction. Further, when the insulating rod 2 is rotated rightward and the locking pin 3 presses the right end portion of the circumferential slit 13b in the same direction, the screw rod that protrudes forward is pulled backward to engage the engaging portion 21b. The hook member 22 that has been opened and retracted is rotated in the closing direction.

  The latch mechanism 60 is uneven by a gear mountain-shaped uneven portion (locked portion) 61 formed along the circumferential direction on the outer periphery of the rear end edge (outer end of the lower end edge) of the distal end unit 20 and the outer peripheral surface of the proximal end unit 11. A latch member 63 having a latch portion (lock portion) 64 that is supported so as to protrude and retract toward the portion 61 and meshes with the concavo-convex portion, and an operating piece 65 that projects from the rear end portion of the latch member 63. The first elastic member 66 that urges the latch member 63 and the operating piece 65 toward the concave and convex portion 61, the sliding contact surface 72a that is in sliding contact with the rear end portion of the operating piece 65, and the sliding contact surface are formed. From the slide piece 72 having a plurality of latch release (lock release) fitting portions (holes or recesses) 72b, 72c for fitting the rear end portion, and from both ends in the circumferential direction of the slide piece 72 Each of the locking pins 3 extending rearward and projecting into the circumferential slit 13b An operation member 70 having pressed pieces 73a and 73b in a contactable positional relationship and capable of moving back and forth in the circumferential direction, and a neutral circumferential position by pressing the action member 70 inward from both sides in the circumferential direction 2nd elastic member 75a, 75b hold | maintained.

The action member 70 is stably guided in the circumferential direction by projecting the guide member 70a on the outer surface of the proximal end unit.
The second elastic members 75a and 75b guided by the guide rods 76 supported by the outer surface of the base end unit 11 on both the left and right sides of the action member 70 urge the action member 70 with equal force from the left and right to the inside. When the locking pin 3 is in the neutral position shown in FIG. 1, it functions to always hold the action member 70 in the illustrated neutral position. The elastic force (expanding force) of each elastic member 75a, 75b is set sufficiently larger than the elastic force (expanding force) of the first elastic member 66.
The latch member 63 and the operating piece 65 integrated with the latch member 63 are guided by a guide member 63a provided on the outer surface of the proximal end unit in order to stabilize the movement in the axial direction, and the first elastic member 66 is a latch member. It arrange | positions between 63 and the slidable contact surface 72a, and is urged | biased in the expansion direction, the latch part 64 is press-contacted to the uneven | corrugated | grooved part 61, and the operating piece 65 rear end is press-contacted to the slidable contact surface 72a. In this example, the 1st elastic member 66 is arrange | positioned between the annular collar member 65a and the latch member bottom face which were fitted so that it could advance / retreat to an axial direction along the rear end of an action | operation piece. The flange member 65a moves in the circumferential direction along the sliding contact surface while transmitting the force from the first elastic member 66 to the sliding contact surface 72a. The operating piece rear end portion protrudes and retracts toward the fitting portion side through the central hole of the flange member.
When the action member 70 moves in the circumferential direction (rightward direction) and the rear end portion of the operating piece 65 reaches the left fitting portion 72b, the operating piece rear end portion is fitted (immersed) into the fitting portion 72b. Then, the locked state (strong contact state) between the latch portion 64 and the uneven portion 61 is released. In this state, the latch part 64 and the concavo-convex part 61 are lightly in contact with each other by the urging force of the first elastic member 66, but are not in a strong locked state, and the action member 70 and the latch member 63 with respect to the tip unit 20. Can be moved in the circumferential direction. At this time, the latch member 64 and the uneven portion 61 allow the movement of the action member while intermittently contacting the tick.

As shown in FIG. 1, when the locking pin 3 is in the neutral position that is the intersection of the axial slit 13a and the circumferential slit 13b, the rear end portion of the operating piece 65 is in contact with the sliding contact surface 72a. The latch portion 64 is in a state of being strongly locked with the uneven portion 61, and when the rear end portion of the operating piece is fitted in the fitting portion, the latch portion 64 is in a state of being unlocked from the uneven portion. In the state of FIG. 1, the hook member 22 is in an open state as shown by the solid line.
Further, in FIG. 1, when the hook member is locked to the electric wire W and rotation of the tip unit 20 is prohibited, the insulating rod 2 is rotated to the right to move the locking pin 3 from the neutral position to the right (hook member). When the action member 70 is rotated in the right direction by a predetermined angle by moving in the closing direction), the rear end portion of the operating piece 65 is fitted into the left fitting portion 72b as shown in FIG. . When the insulating rod is further rotated leftward in the state shown in FIG. 2 in which the rear end portion of the operating piece is fitted in the fitting portion, the force that the locking pin 3 presses the action member 70 rightward is released. Therefore, the action member 70 tries to return to the left by the expanding force of the second elastic member 75a on the right side that has been compressed so far. Since the expansion force of the second elastic member 75a exceeds the force by which the first elastic member 66 presses the latch member and the operating piece against the sliding contact surface 72a, the action member 70 starts moving leftward. Immediately after that, the rear end portion of the operating piece 65 is disengaged (pushed out) from the fitting portion 72b and rides on the sliding contact surface 72a (state of FIG. 3). For this reason, immediately after the action member 70 is rotated to the left, the latch portion 64 is locked with the concavo-convex portion 61, and the proximal end unit 11 cannot be rotated relative to the distal end unit 20. Further, when the insulating rod is further rotated leftward from the state of FIG. 3, only the action piece 70 is pushed leftward by the locking pin, so that the rear end portion of the operation piece relatively slides while sliding on the sliding contact surface 72a. Move to the right. When the rear end portion of the operating piece reaches the neutral position (the center in the circumferential direction of the sliding contact surface 72a), the locked state becomes more secure, and the locking pin 3 reaches the distal end portion of the axial slit 13a. Thus, the insulating rod can be pulled out from the opening 12 of the eleventh opening. Therefore, when the insulating rod is rotated leftward from the state shown in FIG. 2, the hook member opening / closing mechanism 40 cannot operate in the hook member opening direction, and the hook member 22 can be kept closed.

For this reason, the insulating rod can be detached from the base end unit 11 while taking out the locking pin 3 from the notch 13 without weakening the pinching force of the electric wire W by the hook member.
As shown in FIG. 2, after the rear end portion of the operating piece 65 is fitted to the left fitting portion 72b, the operating rod rear end portion is moved from the fitting portion 72b by further rotating the insulating rod to the right. Since it will be in a locked state if it detaches | leaves and moves relatively on the sliding contact surface of the left side of the fitting part 72b, the operating piece rear end part will detach | leave from a fitting part on the left side of the fitting part 72b. It is preferable to provide a stepped portion (detachment preventing portion) 72a ′ so that it cannot move to the left. By providing the stepped portion 72a ′, the rear end portion of the operating piece remains fitted in the fitting portion even when the action member 70 rotates further to the right than the position of FIG. For this reason, the proximal end unit 11 can be rotated relative to the distal end unit 20, and can be rotated to firmly clamp the hook member with the electric wire.

  When the hook member 22 is closed as shown in FIG. 3 and the state in which the electric wire W is held under pressure is released, the rear end portion of the operating piece 65 is slidably brought into contact with the sliding surface 72a by rotating the insulating rod leftward. Are moved in the right direction relatively, and finally fitted into the right fitting portion 72c. As long as the rear end portion of the operating piece 65 is on the slidable contact surface 72a, the latch portion 64 continues to be strongly locked with the concavo-convex portion 61 and the base end unit 11 cannot be rotated with respect to the front end unit. The member cannot be opened, but the locked state is released when the rear end portion of the operating piece is fitted in the fitting portion 72c. In this state, if the insulating rod is further rotated leftward, The proximal end unit 11 can be rotated relative to the unit 20. When the rear end portion of the operating piece is fitted in the fitting portion 72c, it cannot be moved further to the right by the stepped portion 72a 'located on the right side thereof. It is possible to turn the tip unit in the opening direction by turning leftward, and to release the hook member from the electric wire.

In the ground hook according to the present invention, when the rear end portion of the operating piece of the latch member is fitted into the fitting portions 72b and 72c provided on the action member 70, the strong lock between the latch portion and the uneven portion is released. Thus, the proximal end unit 11 can be rotated relative to the distal end unit 20 that is prevented from rotating. On the other hand, when the rear end portion of the operating piece is detached from the fitting portion and comes into contact with the sliding contact surface 72a, the latch portion and the concavo-convex portion are strongly locked. Therefore, the proximal end unit is rotated relative to the distal end unit. It becomes difficult to move.
The action member 70 can move in the circumferential direction even after the distal end unit and the proximal end unit are locked by the rear end portion of the operating piece moving from the fitting portion onto the sliding contact surface. The rod can also rotate within a predetermined range.

Since it comprised in this way, after making the operating piece rear end part fit into the fitting part 72b in the process in which the insulating bar 2 is rotated in the hook member closing direction, the insulating bar is further rotated in the same direction and the limit is reached. By rotating to the position, the hook member opening / closing mechanism 40 can be operated, and the hook member can be firmly coupled to the electric wire W. When the insulating rod is slightly rotated in the hook member opening direction after reaching this coupled state, the operating piece rear end portion is detached from the fitting portion 72b and moves onto the sliding contact surface 72a. (Latch part) and to-be-locked part (uneven part) will lock strongly, and the state where the hook member was firmly locked with the electric wire can be maintained. Further, when the locking pin 3 reaches the neutral position, the insulating rod can be extracted from the rear end opening 12 of the proximal end unit. At this time, since the coupling force between the hook member and the electric wire does not decrease, the hook unit 10 does not rotate with respect to the electric wire and the direction of the rear end opening 12 does not change.
In order to release the coupling between the hook member 22 and the electric wire W, the insulating rod may be inserted into the opening 12 of the base unit and then rotated in the opposite direction. Since the direction of the rear end opening of the proximal unit with respect to the electric wire has not changed, even if there are obstacles in the vicinity, an operation of releasing the coupling between the hook member 22 and the electric wire W by inserting an insulating rod is performed. be able to.

  As described above, according to the present invention, in the process of closing the hook member in the open state, the lock between the latch portion of the latch member and the locked portion of the tip unit can be released once. While the hook member can be freely rotated in the closing direction until the holding pressure is held, even if the insulating rod is slightly rotated in the hook member opening direction in order to remove the insulating rod from the opening of the base unit, Since the locking portion of the latch member immediately locks with the locked portion, the fixing force between the hook member and the attachment object is not weakened.

Further, the locking and unlocking operations by the latch mechanism are performed in such a manner that the rear end portion of the operating piece of the latch member rides on the sliding contact surface provided on the action member while the locking pin advances and retracts the action member in the circumferential direction. This is realized by detaching from the sliding contact surface and fitting in the fitting portion. This operation is smoothed by setting the force for returning the acting member to the neutral position by the second elastic member to be larger than the force for urging the latch member in the locking direction by the first elastic member.
Further, after the locking pin moves in one direction from the neutral position and the operating piece rear end portion of the latch member is fitted in the fitting portion, the action member is further pushed in the same direction by the locking pin. It is possible that the rear end portion of the operating piece is detached from the fitting portion. Therefore, a step portion that prevents the rear end portion of the operating piece from being detached from the fitting portion is provided.
In addition, by interlocking the latch mechanism and the hook member opening / closing mechanism, after the hook member is closed and the object to be attached is clamped and held, the operation is performed by moving the insulating rod slightly in the hook member opening direction. The closed state of the hook member can be locked, and the insulating rod can be detached from the base end unit.
Further, by adopting a hook member opening / closing mechanism using a screw member, the hook member can be effectively opened / closed, locked / unlocked while having a compact configuration.
In addition, as the latch mechanism and the hook member opening / closing mechanism, configurations other than those illustrated and described can be adopted.

DESCRIPTION OF SYMBOLS 1 ... Ground hook, 2 ... Insulating rod, 3 ... Locking pin, 10 ... Hook unit, 11 ... Base end unit, 11a ... Female screw part, 12 ... Rear end opening, 13a ... Axial slit, 13b ... Circumferential slit , 20 ... tip unit, 21 ... base part, 21a ... rotating shaft, 21b ... engaging part, 22 ... hook member, 23 ... holding piece, 40 ... hook member opening / closing mechanism, 41 ... screw rod, 60 ... latch mechanism, 61: Uneven portion (locked portion), 63: Latch member, 63a ... Guide member, 64 ... Latch portion, 65 ... Actuating piece, 65a ... Gutter, 66 ... Elastic member, 70 ... Acting member, 70a ... Guide member, 72 ... sliding piece, 72a ... sliding contact surface, 72a '... stepped portion, 72b ... fitting portion, 72c ... fitting portion, 73a ... pressed piece, 75a ... elastic member

Claims (5)

An earth hook comprising: an insulating rod; a hook unit that allows the rear end opening to be attached to and detached from the outer periphery of the tip end of the insulating rod and that can be relatively rotated; and an earth wire connected to the hook unit. Because
The hook unit includes a proximal unit having the opening at the rear end, a distal unit that is rotatably supported at the distal end of the proximal unit and supports a hook member so as to be opened and closed, and the distal unit. A hook member opening / closing mechanism that opens and closes the hook member when the base end unit is rotated in two forward and reverse directions, and a latch mechanism that allows or prevents relative rotation of the base end unit with respect to the tip unit. With
The rear end edge of the base end unit includes an axial slit extending axially forward from the rear end edge, and a T-shaped notch portion including a circumferential slit extending in both circumferential directions from the distal end of the axial slit. A locking pin protruding from the outer periphery of the insulating rod tip is movably fitted in the notch,
The tip unit includes a base portion that is rotatably attached to the base end unit, and the hook member that is pivotally supported in an opening / closing direction by a turning shaft provided on the base portion. And a holding piece for holding the object to be attached between the hook members,
When the distal end of the insulating rod is fitted into the opening of the proximal end unit and the hook is in the open state, the distal end unit is rotated and the insulating rod is rotated in one direction. A stop pin moves in the circumferential slit in the one direction to rotate the proximal unit in the one direction, so that the hook member opening / closing mechanism closes the hook member, and the hook member is in a closed state. When the insulating rod is rotated in the other direction with the distal end unit being rotated, the locking pin moves in the circumferential slit in the other direction to move the proximal unit in the other direction. The hook member opening / closing mechanism opens the hook member by turning to
The latch mechanism includes a locked portion formed along the circumferential direction on the outer periphery of the rear end edge of the distal end unit, and a lock that is supported by the base end unit so as to advance and retreat in the axial direction and meshes with the locked portion. A hook member that includes a latch member having a front end portion and an operating piece at a rear end portion, and a first elastic member that biases the latch member toward the locked portion. When the latch member is in a closed state, the latch member is locked in a protruding state to lock the lock portion with the locked portion, and the insulating rod rotates in the other direction while maintaining the lock state. An earth hook characterized in that it is allowed to do. The latch mechanism further includes a sliding piece having a sliding contact surface that is in sliding contact with a rear end portion of the operating piece, and a plurality of unlocking fitting portions that fit the rear end portion, and the sliding piece An action member that has a pressed piece that is in a positional relationship that can contact the locking pin that extends rearward from both ends in the circumferential direction and protrudes into the circumferential slit, and the action member that can advance and retreat in the circumferential direction. And a second elastic member having a resilient force stronger than that of the first elastic member.
When the locking pin is in a neutral position that is an intersection of the axial slit and the circumferential slit, the rear end portion of the operating piece is in contact with the sliding contact surface. When the rear end portion of the operating piece is fitted in the fitting portion, the lock portion is unlocked from the locked portion,
When the locking pin moves in the circumferential direction from the neutral position and moves the action member by a predetermined angle in the circumferential direction, the rear end portion of the operating piece is fitted into one of the fitting portions, and the locking pin Is moved in the direction returning to the neutral position, the action member is moved in the direction returning to the neutral position by the force of the second elastic member, and the rear end portion of the operating piece is detached from the fitting portion. The ground hook according to claim 1, wherein the ground hook rides on the rubbing surface.   When the rear end portion of the operating piece is fitted in the fitting portion, the rear end portion of the operating piece is moved away from the fitting portion when the locking pin moves to the side opposite to the neutral position. The ground hook according to claim 1, further comprising a stepped portion for preventing separation.   When the locking pin is further moved in the same direction after the rear end portion of the operating piece is fitted in the one fitting portion by the movement of the locking pin in the circumferential direction, the base end unit is the same. When the hook member opening / closing mechanism is operated by rotating in the direction to rotate the hook member in the closing direction and the locking pin is moved in the reverse direction, the rear end portion of the operating piece becomes the one fitting portion. The ground hook according to any one of claims 1 to 3, wherein the ground hook is disengaged and rides on the sliding contact surface. The hook member opening / closing mechanism is disposed inside the base portion so as to be capable of moving forward and backward in the axial direction, and the tip of the hook member opening / closing mechanism rotates with respect to an engaging portion provided closer to the tip of the hook member than the pivot shaft of the hook member. A screw member that is movably coupled and has a rear portion screwed with a screwed portion formed in the proximal end unit,
When the distal end of the insulating rod is fitted into the opening of the proximal end unit and the hook is in the open state, the distal end unit is rotated and the insulating rod is rotated in one direction. A stop pin moves in the circumferential slit in the one direction and presses the proximal end unit to rotate in the one direction, so that the screw member moves backward by the rotation of the screwed portion. And pulling down the engagement portion rearward to close the hook member,
When the insulating rod is rotated in the other direction with the tip unit being rotated when the hook member is in the closed state, the locking pin moves in the other direction in the circumferential slit to move the base. When the end unit is pressed and rotated in the other direction, the screw member moves forward by the rotation of the screwed portion and presses the engaging portion forward to release the hook member. The grounding hook according to any one of claims 1 to 4, wherein the grounding hook is provided.

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