JP2000115968A - Bus-duct connecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a bus-duct connecting apparatus in which a collective tightening bolt can be tightened up to a prescribed tightening torque by a small force, by a method wherein an inside plate whose socket port is formed and installed so as to be faced outward in a planet gear mechanism arranged and installed between a sun gear and an internal gear is fixed to a planet gear shaft, and an outside plate in which an insertion and passage hole is bored and formed is fixed to the planet gear shaft. SOLUTION: In a base part 10 which uses a planet gear mechanism, an inside plate 14 and an outside plate 15 are attached to, and palced on, both sides of the planet gear mechanism which is composed of a sun gear, a planet gear and an inside gear. A socket port 14a which is fitted to the collective tightening bolt 31 of a bus-duct connection part 30 is formed, so as to be faced outward, on the outer side face of the inside plate 14 which is attached to the rear of the planet gear mechanism. The size of an insertion and passage hole into and through which a sun gear shaft 11a in the central part of the outside plate 15 is inserted and passed is slightly larger than the size of the sun gear shaft 11a. Tip parts of a protrusion part 21 are fitted to the right side face and the left side face of the swell part 30 of the bus-duct connection part 30. Lock mechanism which are coupled to, and removed from, the right end edge part and the left end edge part of a duct-side-plate joint plate 35 are installed additionally at both end parts of a right arm and a left arm 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planetary gear, which is a gear mechanism for transmitting rotational motion, in a connecting device used for assisting a bolting operation of a bus duct, particularly a bus-tightening bus duct such as an insulated conductor contact type or a phase-reduction type. The present invention relates to a bus duct connection device that improves a bolt tightening operation by using a gear mechanism.

[0002]

2. Description of the Related Art Conventionally, when connecting bus ducts which are collectively tightened with bolts, as shown in FIGS. 1 and 2, an in-phase insulating coating 38a in a bus duct unit 37 to be connected is provided halfway. Are overlapped at their ends, and insulating separators 39 are interposed between the different-phase conductors and between the outermost conductor and the duct side plate joining plate 35, respectively.
The bolts 31 with insulating coating via the disc spring washers 36 are passed through the duct side plate joining plate 35, the insulating separator 39, and the conductor 38, and are collectively tightened with the nuts 32. The upper and lower open surfaces of the bus duct connecting portion 30 configured as described above are respectively covered with a cover member 40 and fixed with a screw component or the like.

As another example, as shown in FIG. 10 and FIG. 11, different-phase conductors 38 are abutted at predetermined intervals, and a backing plate 41 is attached.
There is also a type in which a double-headed insulation-coated bolt 31 is passed through the duct-side plate connecting plate 35 and is collectively tightened with a nut 32. Also in this case, the upper and lower open surfaces of the bus duct connection portion 30 formed by tightening the bolts 31 and the nuts 32 together are covered with the cover members 40, respectively, and are fixed with screw parts or the like.

[0004] When tightening with the collective tightening bolts 31 in the bus duct, a bolt such as a torque wrench is applied to the head of the bolt to rotate the bolt 31, and the nut 32 is prevented from rotating by the disc spring washer 36. Screw in the screw. At this time, the force required for the tightening gradually increases as the tightening progresses and approaches a predetermined tightening torque. When the predetermined tightening torque is finally reached, the tightening operation of the collective tightening bolts 31 is completed, and the bus duct connection portion 30 is connected by the predetermined tightening force.

The bus duct connecting portion 30 is tightened by a bolt having a normal head, or by a bolt having a double head and a predetermined tightening torque, depending on the configuration of the bolt used for the tightening. There is one that shears the outer head. The bolt tightening torque for connecting the bus duct is M12 = 44.
1 Nm (450 kgf / cm), 117.7 for M16
N · m (450 kgf / cm) or the like.

However, in the above-described configuration in which the bus duct connection portion is tightened with the collective tightening bolts, not much tightening force is required in the initial stage, but as the tightening operation progresses and approaches the predetermined tightening torque, it becomes necessary. The tightening force gradually increases. As a result, the posture at the time of the tightening work becomes severe, and in the tightening work in a high place, a narrow place, etc., a situation such as the removal of the tightening tool from the bolt head occurs, and the tightening work is very difficult and dangerous. .

Further, when using a double-headed bolt or the like that shears the outer head with a predetermined tightening torque,
The operator may lose his or her posture due to excessive force when the outer head of the bolt is sheared, and the occurrence of such an abnormal situation has made the tightening operation more difficult and dangerous.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to enable a collective tightening bolt to be tightened to a predetermined tightening torque with a small force. It is an object of the present invention to provide a bus duct connection device that can perform a tightening operation extremely safely and easily even in a place having poor workability such as a narrow place.

It is another object of the present invention to provide a bus duct connecting device which is stably held in a bus duct and does not cause an unexpected situation, and realizes higher safety and workability.

[0010]

According to the bus duct connecting apparatus of the present invention, a conductor and an insulating separator are sandwiched by a duct side plate joining plate, and bolts penetrating from one duct side plate joining plate to the other duct side plate joining plate are provided. In a bus duct connection device used for a bus duct connection portion to be screwed and fastened to a nut, a sun gear formed around a convex or concave rotation input portion at an outer center is disposed at a center in an internal gear, Between the sun gear and the internal gear, a planetary gear mechanism in which a planetary gear having a planetary gear shaft rotatably mounted at the center is disposed at the center, and a socket opening for fitting a bolt head or a nut at the center is externally provided. An inner plate formed in the direction is fixed to the planetary gear shaft and attached to the inside, and an outer plate having a through hole slightly larger than the rotation input portion at the center is fixed to the planetary gear shaft to form an outer plate. Base attached to When having a tip projecting portion which engages the outer surface of the bus duct connecting portion, characterized in that it consists of an outer periphery of the base portion and the arm is Katachi設 to the left and right.

Further, the above-mentioned bus duct connecting device is arranged near the tip of the arm via a supporting portion so as to prevent the engaging portion from coming off.
The engagement portion is provided so as to be freely disengageable.

In the above bus duct connecting device, an auxiliary arm is attached to the arm, and a tip end of the auxiliary arm is attached to a circular engagement fitting fitted around a disc spring washer interposed below a bolt head or a nut. It is characterized by being connected.

[0013]

When the bus duct connection unit is tightened with the collective tightening bolts using the above bus duct connecting device, the arm ends abut against both side surfaces of the bulging portion, and the collective tightening bolts are integrated with or separate from the connecting device. When rotating in the tightening direction with the rotating rod, the rotational force is transmitted to the bulging part that abuts the arm end and is supported by the reaction force, so the bus duct connection device is kept in a stable state Is done.

By reducing the tightening rotation speed of the collective tightening bolts at the bus duct connecting portion by the planetary gear mechanism, the collective tightening bolts can be tightened to a predetermined tightening torque with a smaller force.
It is possible to work extremely safely and easily even in a place where workability is not good such as a narrow place.

When the bus duct connection is tightened by using a double-headed bolt or the like that shears the outer head, the tightening operation is completed with extra force even when the outer head is sheared by reaching a predetermined tightening torque. It is extremely safe and workable.

Further, the thickness of the bus duct connecting apparatus according to the present invention is extremely thin as compared with a commercially available electric tool used for connecting the bus duct, and the bus duct connecting apparatus is provided at a connecting portion of a plurality of electric lines in which bus ducts are arranged at predetermined intervals. Can also be easily handled. Further, it can be manufactured at an extremely low cost and is effective.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on specific embodiments, but the present invention is not limited to these embodiments.

First, FIGS. 1 to 6 show a bus duct connection device (first embodiment) using a planetary gear reduction mechanism when applied to the tightening of collective tightening bolts at a connection portion of a close contact type insulated bus duct. FIGS. 1 to 3 are a plan view, a front view, and a rear view in which the bus duct connection device 1 of the first embodiment is fitted to a bulging portion of a close contact type insulated bus duct connection portion of an in-phase conductor overlapping method. 4 to 6 are a plan view, a front view, and a rear view in a state where the connection device of the first embodiment is tightened.

The bus duct connection device 1 according to the present invention utilizes a planetary gear mechanism, which is one of the gear units for transmitting rotational motion, and is used as a fastening aid when the bus duct connection portion 30 is tightened with the collective tightening bolts. It is a new connection device. The bus duct connection device 1 of the first embodiment shown in FIGS. 1 to 6 is used in an auxiliary manner when the insulated insulated bus duct connection portion 30 of the in-phase conductor overlapping method is collectively fastened with the bolts 31 and the nuts 32. The basic configuration is a base 10 having a planetary gear mechanism,
An arm 20 extends from the base 10 to the left and right, and supports the connecting device 1 on the connecting portion 30 at both ends.

The base 10 utilizing the planetary gear mechanism is shown in FIG.
As shown in the exploded perspective view of FIG.
2. An inner plate 14 and an outer plate 15 are attached to both sides of the planetary gear mechanism including the internal gear 13, respectively. A rotational force is input from the outer plate 15 side, and the increased torque is transmitted to the inner plate 14 side. Output from.

In the planetary gear mechanism, a hexagonal prism-shaped sun gear shaft 11a that is interlocked with a tightening input is integrally formed at the center of the sun gear 11 located at the center. That is, the sun gear shaft 11a functions as a rotation input unit. Four planetary gears 1 located on the outer periphery of sun gear 11
2, a center through hole 12b of the planetary gear shaft 12a is formed.

A circular inner plate 14 is integrally attached to the back surface of the planetary gear mechanism, and a hexagon socket socket opening which fits into the collective tightening bolt 31 of the bus duct connecting portion 30 is provided on the outer surface of the inner plate 14. 14a is provided outward. The socket opening 14a serves as an output section of a rotational force for tightening a bolt head or a nut. The inner plate 14 has a hole 14b for inserting the planetary gear shaft 12a.
Are drilled at four locations.

On the other hand, a circular outer plate 15 is integrally mounted on the front of the planetary gear mechanism, and a central portion of the outer plate 15 has a square convex, for example, a hexagonal prism-shaped sun gear shaft 1.
An insertion hole 15a through which 1a is inserted is formed. The size of the insertion hole 15a is slightly larger than the thickness of the sun gear shaft 11a. The outer plate 15 is also provided with four holes 15b for inserting the planetary gear shaft 12a. The outer diameters of the inner plate 14 and the outer plate 15 are large enough to cover the outer peripheral portion of the gear of the internal gear 13 of the planetary gear mechanism, and are large enough to prevent dust from entering the planetary gear mechanism.

The inner plate 14 and the outer plate 15 are attached to the planetary gear mechanism by inserting a planetary gear shaft 12a having grooves formed at both ends into shaft through holes 12b formed in the center of each planetary gear 12. The ends of the respective planetary gear shafts 12a that are axially threaded and protrude from the inner and outer surfaces of the respective planetary gears 12 are inserted into the holes 14b and 15b of the inner plate 14 and the outer plate 15, respectively. Then, the inner plate 14 and the outer plate 15 are attached to both side surfaces of the internal gear 13 by fitting E-shaped retaining rings 16 into groove portions formed at both ends of each planetary gear shaft 12a. Therefore, the four planetary gears 12, the inner plate 14, and the outer plate 15 are configured to rotate integrally.

As shown in FIG. 7, when a tightening torque is input to the tip of the hexagonal column-shaped sun gear shaft 11a, which is inserted through the insertion hole 15a at the center of the outer plate 15 and projects outward. A hollow hexagonal diameter expansion sleeve 17 is fitted around the circumference. When the rotational force is input by tightening the expanding sleeve 17 with a wrench or the like, the sun gear shaft 11a is interlocked with the input, the torque is amplified by the planetary gear mechanism, and then output from the socket port 14a.

Here, the planetary gear mechanism provided on the base 10 will be described in more detail. FIG. 8 is a block diagram of the planetary gear mechanism. The planetary gear mechanism has an input portion A for tightening torque and an output portion B for tightening torque. The planetary gear mechanism is fixedly mounted on the sun gear shaft 11a. Rotating sun gear 1
1, a planetary gear 12 supported by a planetary gear shaft 12a, and an internal gear 13 fixedly supported around the planetary gear 12. As shown in FIG. 9, for example, as shown in FIG. 9, the planetary gear 12 rotates leftward around the planetary gear shaft 12a by receiving the rightward rotational force of the sun gear 11 located at the center of its revolution, and the fixedly supported internal gear 13 through the sun gear 11
And revolves around the right side.

The specific design configuration of the planetary gear mechanism is, for example, when a spur gear is used for the sun gear 11, the planetary gear 12, and the internal gear 13, the sun spur gear 11 (the number of teeth Z _a ) is provided at the center, and the outer side. equal intervals in four planetary spur gear 12 (the number of teeth Z _b), each gear of the internal gear 13 (the internal gear, the number of teeth Z _c) the outermost is arranged on the same plane so as to mesh with each other.

At this time, the conditions for the number of teeth Z in each gear are as follows (1) to (3). Here, N is the number of planetary spur gears. (1) Z _c = Z _a + 2Z _b (2) (Z _a + Z _c ) / N = integer (3) Z _b +2 <(Z _a + Z _b ) sin (180 ° / N) Reduction of the planetary spur gear mechanism ratio calculation equation obtained by the planetary type, the calculation formula is _{1 / {(Z c / Z} a) +1}.

As an example of the conditions of the planetary gear mechanism and the reduction ratio, in the case of FIG. 9, the number of teeth Z _a = 22 of the sun spur gear 11, the number of teeth Z _b = 14 of the planetary spur gear 12, and the number of teeth of the internal gear 13 Z _c = 5
0, when the number N = 4 of the planetary spur gear _{12, (1) Z a +} 2Z b = 22 + 2 × 14 = 50 = Z c (2) (Z a + Z c) / N = (22 + 50) / 4 = 18
_{(Integer) (3) Z b +2 <} (Z a + Z b) sin (180 ° /
N) 14 + 2 <(22 + 14) sin (180 ° / 4) 16 <36 sin (45 °) 4 <9 × 1 / {2} 4 <6.364, which matches the condition of the number of teeth in each gear.

Further, the reduction ratio of the power transmission is 1 / ｛(Z _c
/ Z _a ) +1} as follows. 1 / {(50/22) +1} 0.306 From the above, since (work amount) = (force) × (distance), and the work amount is constant, the distance is about 1/3 at 0.306. So the force is three times its reciprocal.

That is, in the example shown in FIG. 9, when the rotational force output from the output portion B used to tighten the bolt head or the nut is set to 1, the rotational force input from the input portion A by tightening with a wrench or the like is A small force of about 1/3 is sufficient. However, since the rotational movement distance on the rotational force output unit B side is reduced to about 1/3, the tightening of the rotational force input unit A is about three times as compared with the normal case where the planetary spur gear mechanism having the above configuration is not used. A rotation distance will be required.

Therefore, the planetary gear mechanism shown in FIG.
When the rotational force is transmitted by the connection device 1 provided at the position 0, the sun gear shaft 11a to which the enlarged diameter sleeve 17 for tightening input is attached is rotated in the tightening direction with a wrench or the like. In response to this, for example, the sun gear 11 rotates clockwise, and the four planetary gears 12 meshing with the sun gear 11 rotate independently to the left around the shaft independently, while rotating around the sun gear 11 to the right. Revolves around. At this time, the circular inner plate 14 and the outer plate 15 attached to the shaft of the planetary gear 12 also rotate rightward. However, the rotation speed is controlled by the planetary gear mechanism, and the sun gear shaft 1 for tightening input is used.
It is 1/3 of the rotation speed of 1a.

At this time, although the tightening rotation speed is reduced, the hexagonal sun gear shaft 11a, which is a tightening rotation input portion, which protrudes from the outer plate 15, and the tightening bolt head of the inner plate 14, which is the tightening rotation output portion, are connected. The ratio of the received tightening force of the socket port 14a is 1: 3, so that a large tightening rotation output can be supplied with a small tightening rotation input.

The arm 20 extending left and right from the base 10 is bent into a predetermined shape as shown in FIGS. 1 to 6, and one end is screwed at the position of the outer periphery of the internal gear 13 constituting the planetary gear mechanism. , And bent portions 21 bent inward are formed at both ends of each arm 20. The distal end of the bent portion 21 which is a protruding portion engages with the left and right side portions of the bulging portion 33 of the bus duct connecting portion 30.

Further, the connecting device 1 of the bus duct connecting portion 30
The mounting surface is formed by screwing and connecting the duct side plates 34 of the left and right bus ducts to be connected to each other with the duct side plate connecting plate 35, and is detachable from the left and right end portions of the duct side plate connecting plate 35. Lock mechanism, the left and right arms 20
At both ends.

In the lock mechanism described above, inside the vicinity of the curved portions at both ends of the arm 20, the engaging portions 22 which engage with the left and right ends of the duct side plate joining plate 35 are supported by the supporting portions 23. It is arranged to keep it from falling out. The support portion 23 inserts a screw 21 b through a screw insertion hole 21 a formed in the bent portion 21 at the end of the arm 20,
1b is inserted into the coil spring 21c, the coil spring 21c is interposed, and the tip of the screw 21b is screwed into the support portion 23 to be fixed. The length of the screw 21b depends on the connection device 1
When attached to the bus duct connection 30,
The inside distance of the left and right engagement portions 22 is a length that is in a locked state with respect to the left and right edge portions of the duct side plate joining plate 35 (FIGS. 4 to 4).
See FIG. 6).

A connecting piece 24 is rotatably mounted on both upper and lower surfaces of the support portion 23. A cylindrical portion 25 is screwed between the distal ends of the connecting pieces 24, and the end bent portion 21 is provided.
Is mounted so as to be rotatable along the arm 20 with the. The lock mechanism having the above-described configuration is disposed at both left and right ends of the arm 20.

The cylindrical device 25 on the left and right sides of the arm 20 is rotated to move over the bent end portion 21, so that the connecting device 1 is in the state shown in FIGS. 1 to 3 and the state shown in FIGS. It is a configuration that can transfer each other. For example,
When the connecting device 1 is shifted from the state shown in FIGS. 4 to 6 to the state shown in FIGS. 1 to 3, the left and right cylindrical portions 25 are rotated to get over the end bent portions 21 and further rotated. Then, the screw 21b inserted into the bent portion 21 and fixed to the support portion 23 projects outward. For this reason, further rotation of the cylindrical portion 25 is suppressed, and at this time, the coil spring 21c is in a compressed state (see FIG. 3). The inner distance of the left and right engagement portions 22 is designed to be detachable from the left and right end portions of the duct side plate joining plate 35 in the above state (FIG. 2, FIG.
(See FIG. 3).

When the bus duct connection device 1 is actually used, the following operation is performed.

First, a commercially available tightening tool such as a ratchet wrench or a spanner is engaged with the head of the collective tightening bolt 31 protruding from the front of the bus duct connection portion 30, and normal tightening work is performed until the tightening becomes tight. At the stage where the tightening has become tight, the tightening tool is removed, and the connecting device 1 is attached to the bulging portion 33 of the bus duct connecting portion 30.

At the time of attachment, the cylindrical portion 25 attached to the left and right arms 20 is rotated to get over the bent end portion 21 and further rotated to be stopped at the position where it is locked by the screw 21b. Keep it. Then, in this state, the socket opening 14a formed in the center of the inside of the base 2 is fitted to the head of the bus duct collective connection bolt 31, and the end bent portions 21 of the left and right arms 20 are connected to the bus duct connection portion 30. (See FIGS. 1 and 2).

After that, when the cylindrical portion 25 is pulled toward the front in the bulging portion 33 and the end portion bent portion 21 is overcome in the opposite direction, the return force of the coil spring 21c causes the support portion 2 to move.
3 and the engagement portion 22 move inward in conjunction with this (see FIG. 6). The protruding portions of the engaging portions 22 that have moved inward engage the left and right edges of the duct-side plate joining plate 35, and the connection device 1 is fixed to the duct-side plate joining plate 35 (FIGS. 4 and 5). reference).

Next, it protrudes outside the center of the connection device 1,
A diameter-enlarging sleeve 17 is fitted on a sun gear shaft 11a having a hexagonal head that is interlocked with the sun gear 11.
The bolt 31 is tightened by rotating the 7 with a tightening tool (not shown) such as a torque wrench.
At the time of tightening, the inner surface of the inward bent portion 21 at the tip of the left and right arms 20 is connected to the bulging portion 33 of the bus duct connecting portion 30.
Presses against the side surface to play a role of supporting the reaction force and stop the rotation. The tightening operation is completed by tightening the bolt 31 to the predetermined tightening torque.

When the connecting device 1 is removed from the bus duct connecting portion 30 after the tightening work is completed, the reverse of the above-described mounting procedure is performed, and the connecting device 1 is returned to the state shown in FIGS. The connection mechanism 1 may be released from the bulging portion 33 of the connecting portion 30 of the bus duct by releasing the lock mechanism such as the portion 22.

The tightening rotation speed of the collective tightening bolt 31 is reduced by the planetary gear mechanism. However, the collective tightening bolt 31 can be tightened to a predetermined tightening torque with a small force, and workability in a high place or a narrow place is not good. It is very safe and easy to work in places.

In the configuration of the first embodiment,
A lock mechanism including the engaging portions 22 and the like of the connection device 1 acts on the left and right edge portions of the duct side plate joining plate 35 to fix the connection device 1 to the bus duct, thereby preventing the connection device 1 from falling.

Next, the connecting portion 30 of the contact type insulated bus duct
A second embodiment of the bus duct connection device 1 applied to the tightening of the tightening bolt 31 will be described. FIG.
12 to FIG. 12 are a plan view, a front view, and a rear view in which the bus duct connection device 1 of the second embodiment is applied to the bulging portion 33 of the connection portion 30, and FIGS. 13 and 14 are examples of the second embodiment. FIG. 15 is a plan view showing a state where the connecting device 1 is tightened, a rear view, and FIG. 15 is a plan view showing a state where the tightening in FIG. 13 is completed and the bus duct connecting device is removed from the bus duct connecting portion.

In this case, the configuration of the bus duct connecting portion 30 is a common-phase conductor butt system, and the head of the collectively tightening bolt 31 of the connecting portion 30 has an inner and outer double head, and is intermediate between the inner head 31a and the outer head 31b. The portion has a narrow neck portion 31c that is sheared with a predetermined tightening torque. The configuration of the bus duct connection unit 30 to which the connection device 1 is applied is appropriate as long as it is included in the gist of the present invention, in addition to the bus duct connection unit 30 of the first embodiment or the second embodiment. .

The planetary gear mechanism located at the center of the connecting device 1 and the overall configuration thereof are substantially the same as the configuration of the connecting device 1 described in the first embodiment. Instead of 11a, a rectangular recess, for example, a hexagonal insertion hole 11b for inserting a fastening tool is formed. That is, the insertion hole 11b functions as a rotation input unit. In this case, the size of the insertion hole 15a of the outer plate 15 is slightly larger than the size of the insertion hole 11b.

At both ends of the arm 20 extending left and right from the planetary gear mechanism, an inward projection 26 serving as a projection is formed.
It engages with the left and right side surfaces of the bulging portion 33 of 0, and plays a role of preventing rotation when tightening.

An auxiliary arm 27 extends inward from the inner surface of the intermediate portion of the left and right arms 20 and is connected to a circular engaging metal fitting 28 for fitting around the disc spring washer 36 of the bolt 31 for collectively tightening the bus ducts. The tip is connected. The inner diameter of the circular engagement fitting 28 is slightly larger than the outer diameter of the disc spring washer 36 to be fitted, and a notch 28a is provided at one place so that the fitting can be performed after the engagement, and outward projections are provided on the left and right portions thereof. A pair of protrusions 28b are provided, and the pair of protrusions 28b can be screwed with screws 28c to be fitted to the disc spring washer 36. By providing the auxiliary arm 27 and the circular engaging metal fitting 28, when the connecting device 1 is supported and fixed to the bus duct connecting portion 30, the periphery of the disc spring washer 36 interposed on the lower surface of the head of the bolt 31 can be used.

In order to attach the connection device 1 of the second embodiment to the bus duct connection portion 30, the socket opening 14a provided on the inner plate 14 of the planetary gear mechanism of the connection device 1 must be
It fits on the outer head of the collective tightening bolt 31 of the bus duct connection part 30. At this time, as shown in FIGS. 10 and 11, the circular engagement metal fitting 28 automatically fits around the disc spring washer 36, and the projection 26 provided at the end of the left and right arms 20.
Is in a state of being engaged with the outer surface of the bulging portion 33.
FIG. 12 is a rear view of the connection device 1 in the above state.

Next, a pair of outwardly protruding portions 28b provided on the circular engagement metal fitting 28 located around the disc spring washer 36 is screwed together with a screw 28c and screwed into the circular engagement metal fitting 28.
Is fitted on the outer circumference of the disc spring washer 36 (FIGS. 13 and 14).
reference). By fitting the connecting device 1 through such a circular engaging metal fitting 28, a fitting mechanism works around the disc spring washer 36, and the fixing to the bus duct connecting portion 30 is ensured. Can be prevented.

In the above state, a specially formed ratchet wrench or the like (not shown) is fitted into the square insertion hole 11b formed at the center of the outside of the sun gear 11, and tightened to a predetermined tightening torque. When tightening to the predetermined tightening torque, the tightening bolt 3
One thin neck portion 31c is sheared, and the outer head portion 31b comes off. Thus, the tightening operation is completed (see the example shown in FIG. 15). The connection device 1 may be removed by performing the above procedure in reverse.

In the second embodiment, similarly to the first embodiment, when the work of tightening the bus duct connecting portion 30 is performed, the connecting device 1 is not used to some extent, and a commercially available tool (monkey spanner, ratchet wrench) is used. ), And by using the connecting device 1 in the final stage, the fastening operation can be performed very efficiently. However, the means is appropriately determined depending on the working environment and the like.

In the connection device 1 of the first embodiment and the second embodiment, the ends of the bent portions 21 and the projections 26 formed on both ends of the arm 20 are appropriately hardened. By fitting a plastic cap as necessary, the bus duct connecting portion 30 can be supported by reaction force support during tightening.
It is preferable to prevent the peeling of the coating, the generation of scratches, and the like on the side surface of the bulging portion 33.

The rotational speed reduction ratio can be freely set by appropriately changing the number of teeth of the sun gear 11, the planetary gear 12, and the internal gear 13, and is limited to the above embodiment. It is not, but the rotation reduction ratio is 1/4
When it is set to １ ／, it is suitable for bolt tightening by an average worker.

The shape of the sun gear shaft 11a or the insertion hole 11b of the fastening tool at the center of the sun gear 11 is hexagonal in the illustrated example of the embodiment, but transmits a rotational force such as another polygon. It is appropriate if possible.
If necessary, a fastening tool may be integrally fixed to the connection device 1 so as to be interlocked with the sun gear 11.

[0059]

As described above, the bus duct connecting device according to the present invention has the above-mentioned structure, so that the bolts or nuts of the bus duct connecting portion to be tightened with the collective tightening bolts or the like can be tightened to a predetermined tightening torque with a small force. There is an effect that the fastening operation can be performed extremely safely and easily even in a place where the workability is not good, such as a place.

Further, the bus duct connection device has an effect that a higher security and workability can be realized without being stably held by the bus duct by the specially configured arm so that an unexpected situation does not occur. .

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a bus duct connection device according to a first embodiment of the present invention is fitted to a connection portion of a close contact type insulated bus duct.

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a rear view of the bus duct connection device in the state of FIG. 1;

FIG. 4 is a plan view showing a state in which the bus duct connection device according to the first embodiment of the present invention is fitted to a connection portion of a close contact type insulated bus duct and then tightened.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a rear view of the bus duct connection device in the state of FIG. 4;

FIG. 7 is an exploded perspective view of a base of the bus duct connection device.

FIG. 8 is a block diagram of a planetary gear mechanism in the bus duct connection device.

FIG. 9 is a front view showing a specific design configuration example of the planetary gear mechanism of FIG. 8;

FIG. 10 is a plan view showing a state in which the bus duct connection device according to the second embodiment of the present invention is fitted to a connection portion of a close contact type insulated bus duct.

FIG. 11 is a front view of FIG. 10;

FIG. 12 is a rear view of the bus duct connection device in the state of FIG. 11;

FIG. 13 shows a state after fitting the bus duct connection device of the second embodiment according to the present invention to a connection portion of a close contact type insulated bus duct.
The top view of the state where it was tightened.

FIG. 14 is a rear view of the bus duct connection device in the state of FIG. 13;

FIG. 15 is a plan view showing a state where the fastening in FIG. 13 is completed and the bus duct connection device is removed from the bus duct connection portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bus duct connection device 10 Base 11 Sun gear 12 Planetary gear 13 Internal gear 20 Arm 21 Folding part 22 Engaging part 28 Circular engaging metal fitting 30 Bus duct connecting part 31 Bolt

Claims (3)

[Claims] 1. A bus duct connection in which a conductor and an insulating separator are sandwiched by a duct side plate joining plate, and a bolt penetrated from one duct side plate joining plate to the other duct side plate joining plate is screwed into a nut and fastened together. In the bus duct connecting device used for the part, a sun gear formed with a convex or concave rotation input part at the outside center is disposed at the center in the internal gear, and between the sun gear and the internal gear, A planetary gear mechanism provided with a planetary gear rotatably passed through a planetary gear shaft is provided with an inner plate having a socket opening for fitting a bolt head or a nut outwardly formed at the center thereof. A base portion fixed to the shaft and mounted inside and an outer plate having a through hole slightly larger than the rotation input portion at the center, fixed to the planetary gear shaft and mounted outside; and an outer surface of a bus duct connection portion The protrusion that engages with A bus duct connection device having an end and an arm formed left and right from the outer periphery of the base. 2. An engaging portion is provided near a distal end of the arm via a supporting portion so as to prevent the engaging portion from coming off, and the engaging portion is detachable from right and left edges of the duct side plate joining plate. 2. The bus duct connection device according to claim 1, wherein the bus duct connection device is provided on a bus duct. 3. An auxiliary arm is attached to the arm, and the distal end of the auxiliary arm is connected to a circular engagement fitting fitted around a disc spring washer interposed below a bolt head or a nut. The bus duct connection device according to claim 1, wherein: