JPH0359643B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to drives for use in electrical devices and moving parts. More particularly, the invention relates to an electrical device for use in a low-voltage supply distribution network, including fuses and/or switches, and a drive device for use therein.

Supplying low voltage current from indoor and outdoor substations,
In the case of distribution, equipment such as a fuse panel is incorporated into the supply and distribution network as appropriate for the surrounding environment.

Traditionally, four or five supply buses are used;
Three of them are used, one for each phase of the three-phase current, and the remaining one or two busbars are used as a common neutral wire and ground wire, or as a neutral wire and a ground wire, respectively. be done.

The three-phase current output from the power source is connected to the power transmission cable connected to each bus bar via a respective fuse for each phase. These three fuses are housed in one power distribution device, and each has a contact that connects to each busbar, and another contact that is placed apart from it and engages with each output. , and bridges the points of contact between them.

British Electricity Standards
In the case of power distribution devices of the above-mentioned type manufactured in accordance with the Supply Industry Standard, each contact is completely exposed when the fuse is not installed.

To bridge the contacts, the fuse is engaged by one end with one contact, pivoted about the engagement, and manually moved to connect with the other contact. In this case, it is also possible to attach a fixed or removable fuse holder to the fuse and operate it with it.

In order to safely attach the fuse while the busbar is energized, quick and reliable work is required.

This is especially true if the output line is faulty, as strong arcs are likely to occur, making the work dangerous.

Furthermore, when removing a fuse from a energized circuit, a similarly reliable operation is required and the work is similarly dangerous.

In addition to this operational hazard, this type of power distribution equipment is extremely dangerous because if the fuse is removed, the live and energized contacts remain exposed. It is a danger.

In the case of another power distribution device of the same type, the contacts should be covered when the fuse is not installed, and the worker should be protected from direct exposure to arc when inserting or removing the fuse. Protective means for this purpose and means for reducing the likelihood of arcing are provided.

However, even in the case of this device, the insertion and removal of the fuses is done manually, which is potentially dangerous, and speed and reliability are still required in order to work safely. be done.

In addition, in the case of other types of power distribution equipment, each fuse may be inserted and removed using a device that is permanently fixed and controllable for the necessary operations. .
In this case, operational safety is improved, but the equipment becomes expensive.

It is an object of the present invention to provide a device which improves the safety and economy of power distribution equipment as described above, and which can also be applied to other electrical equipment regarding the operation of fuses and/or switches. It is in.

The electrical device according to the invention has an opening leading into the interior thereof, and a position set back to the interior from the opening.
a fixed casing comprising a pair of fixed contacts spaced apart from each other; a member forming a contact carrier carrying a pair of moving contacts; and a member cooperating with the casing and the contact carrier and the moving contacts; and a stationary contact between a first position in the casing in which the contacts are spaced apart and a second position in the casing in which they are engaged and connected to form a closed circuit. , a self-contained drive comprising a guide device for movement along a straight path, a housing and a drive member moving with respect thereto, and for mechanically driving said contact carrier between said two positions; drive member,
The contact carrier includes a coupling device for detachably coupling the contact carrier, and a fixing device for detachably fixing the housing to the casing.

In such devices, the stationary contacts are sufficiently protected by being located inside the casing behind the opening, so that during operation,
The possibility of contact with them is substantially reduced.

Furthermore, by making the contact carrier of the moving contact mechanically drivable, it is possible to operate the contact carrier from a sufficiently distant position without having to approach the fixed contact. in this way,
The operation according to the invention is of a much safer construction compared to conventional devices.

The use of a removable and self-contained drive provides additional cost and safety advantages. In other words, a single drive device can be used to move a large number of contact carriers in sequence.
There is no need for a separate dedicated drive for each contact carrier. Furthermore, when the drive device is not in use, it can be removed and stored safely to prevent accidental operation.

Conveniently, the guide device comprises a slideway on the inner wall of the casing extending from the opening towards the fixed contact, and sliding means mounted on the contact carrier and engaging with said slideway.

The carrier can be used as a switch in which contacts directly connected to each other are attached to bridge fixed contacts. In this case, one of the paired fixed contacts serves as an input contact and the other serves as an output contact, and the output contact can be connected to an output line via a fuse.

Furthermore, it is also possible to connect the output end of the fuse and the output line via another contact attached to another contact carrier to form a circuit that can be opened and closed on both sides of the fuse.

In yet another embodiment, a cartridge-type fuse for electrically connecting pairs of moving contacts is mounted on the contact carrier, allowing for a wider range of applications.

The electrical device according to the invention may be equipped with a stationary device such that upon release thereof the contact carrier moves between the first and second positions. In this case, it is advantageous if the drive is properly positioned so that the locking device can be released so that the contact carrier can only be moved if the drive is used properly. good.

Furthermore, another locking device is provided to connect the drive device to the
It may be possible to operate it only when installed in the correct position on an electrical device.

The present invention includes a self-contained drive device that can be used in combination with the electrical devices described above. This drive unit can couple the driven member and drive it in either direction between two fixed positions.

This drive device includes a housing, a drive member that starts from any rest position with respect to the housing and stops at another rest position adjacent to the housing, and connects the drive member in the rest position to the driven member. a coupling device that operates between the housing and the driving member to move the driving member from each resting position to the immediately next adjacent resting position when the driving member is moved in either the forward or reverse direction; It consists of a drive unit that can

With respect to the electrical device according to the invention described above, the element that is removably connected to the drive device is the contact carrier.

The casing typically houses three pairs of fixed contacts, one for each phase of the AC power source. A moving contact carrier, usually used as a fuse carrier, is connected to each pair of fixed contacts. In this case, a self-contained drive is used to move each moving contact carrier in turn from a first position to a second position, or vice versa.

Fuse panels and the like are usually installed in large equipment called bangs, and it is sufficient to have one drive for each bank.

The drive device is connected to a wander lead wire.
Safety can be further improved by grounding using a lead), and the drive device
Inadvertent removal from the electrical device can be prevented.

Hereinafter, the present invention will be described in detail through examples thereof with reference to the accompanying drawings.

1-3, a three-phase output device is shown for use in a fuse panel or similar device having three different busbars 1-3 for each phase of the power supply.

This three-phase output device consists of two casing members 5 and 6 of similar shape made of plastic molding.
It is provided with a casing 4 in which these are integrated by appropriate means. Each casing member 5, 6 is formed with a wall portion 8, 9 which reaches an opening 10 leading into the inside of the casing.

Inside the casing, there are three pairs of fixed contacts,
installed. The first input contact 11 and the output contact 12 are arranged in the lower part of the casing 4,
Connected to the first busbar 1, a second input contact 13 and an output contact 14 are arranged in the interruption of the casing 4 and connect to the second busbar 2, as well as
The third input contact and the output contact are arranged in the upper part of the casing 4 and connected to the third bus bar 3.

These three input contacts are all the same; for example, the input contact 11 includes a contact 15 for gripping the bus bar 1 and a fixed contact 16. Opposing portions of the contact 11 are brought together and integrally fixed by leaf springs 17 and 18.

Each output contact also has the same structure, for example, the output contact 12 has a contact 19 and a fixed contact 20.
The opposing parts are brought together and integrally fixed by a leaf spring.

The fixed contact 20 is equipped with an arc extinguisher 23. The contactor 19 is connected to the first output conductor 24, and the contacts of the other two output contacts are connected to the second and third output conductors 25 and 26, respectively.

The output device described above is designed to be sufficiently safe when used in conjunction with a fuse panel or similar device.

The two fixed contacts 16 and 20 used for each phase of the three-phase current are arranged sufficiently rearward with respect to the opening 10 of the casing 4, and are attached to the two casing members 5 and 6, respectively. It is sufficiently protected by integrally formed protection plates 27 and 28. Therefore, it is impossible to touch each contact point by mistake during use.

Each bus bar 1 to 3 on the power supply side is connected to an output conductor 2.
4 to 26, bridging the fixed contacts 16 and 20 for each phase with a fuse is as follows:
This is a commonly used method.

In FIG. 1, a fuse in an open state is shown in the lower part, and another fuse in a closed state is shown in the middle part.

In the interrupted part of FIG. 2, the fuse is shown in a closed state, and in the lower part, the state in which the fuse is removed is shown.

Each fuse consists of an integrally molded fuse carrier 29, with contacts 30, 31 fixed by bolts 32, 33, and a cartridge type fuse element 34 also fixed between the contacts. ing.

Each fuse carrier 29 has an outwardly projecting 2
It is provided with book shafts 35 and 36, and pins 37 and 38 are erected on each shaft, respectively.

A sliding portion 39 is formed on both sides of each fuse carrier 29, and each wall portion 8, 9 of the casing 4 extends from the opening 10 toward the fixed contact.
It engages with a slideway 40 formed inside the.

By providing the sliding portion and the slideway in this manner, each fuse carrier 29 can move on a straight path, so that the movable contacts 30 and 31 attached thereto can be connected to the fixed contacts 16 and 20. It is possible to combine and release accurately.

A self-contained drive, shown in the upper part of FIGS. 1 and 2 and in FIGS. 3 and 4, allows each fuse carrier 29 to be moved between open and closed positions. It's summery.

The drive device has a housing 50, in which a cylindrical sleeve (cylindrical cylinder) 51 in which four cam grooves 52 are formed is rotatably attached.

Each cam groove 52 is formed on the outer peripheral surface of the sleeve 51.
It is drilled at an angle slightly exceeding 90 degrees.

Each cam groove has an operational starting point 53 and then 90
and an operational end point 54 located a degree apart;
Each starting point 53 is located on a first plane perpendicular to the central axis of rotation of the sleeve 51, and each ending point 54 is located on a second plane parallel to the first plane. It's becoming like that.

Further, each starting point 53 and the end point 54 of the cam groove adjacent thereto are located on a common plane including the rotation center axis.

A biasable coil spring device is provided in the case 55 and is controlled by an operating member 56 which drives the device via a rod shaft 57 with a rectangular cross section.

This type of spring device is a well-known technology and was manufactured by IMI Santon Ltd., Somerton Works, Newport, Quentt, UK, under the trade name Santon Snap-Action Mechanism SC2/
3034/TB3/HR1" is recommended.

In this spring device, rotating the operating member 56 in either direction can apply a force to either of the two coil springs, which is automatically released by a stop device when it reaches a limit point. Thus, the sleeve 51 is configured to rotate in the same direction as the direction in which the operating member is rotated.

Moreover, this spring device is adapted to be adjusted no matter which direction the operating member is rotated, so that the sleeve 51 can be driven in the proper direction. In this way, the spring device
There is no need to readjust each time when operating continuously.

In order to drive the fuse carrier 29, the drive device must be properly attached to the electrical device. This proper joining position is shown in the upper part of FIG. 1, FIGS. 3 and 4.

As shown in these figures, both sides of the housing 50 are provided with grooves 5 at the top and bottom, respectively.
8 and 59 are provided, each with a nail 6
0,61. The bottom dowel of each phase becomes the top dowel of the phase immediately below it.

When all the grooves are fully engaged with their respective dowels, the pins 37, 38 engage the start or end points of the two cam grooves 52 on the sleeve 51, which are symmetrical to each other. In this way, pins 37, 38
By engaging the sleeve 51 with the cam groove 52, the sleeve 51 is removably connected to the contact carrier 29, and by engaging the grooves 58, 59 with the dowels 60, 61, the housing 50 of the drive device can be removably fastened to the casing 4.

to prevent the fuse carrier 29 from unintentionally moving between the first and second positions when the drive device is not installed;
A locking device is provided.

A guide path 62 is provided for each phase on both sides of the casing 4, along which a locking member 63 can slide vertically. Each locking member 63 is normally in its uppermost position due to a compression spring 64. The locking member 63 has a projection 65 and a recess 6 on the side of the fuse carrier 29.
6 or a protrusion 67 above it.

As shown in the center of FIG. 1, the fuse carrier 29 can freely move between the open and closed positions when the protrusion 65 is aligned with the recess 66, but when it is aligned with the protrusion 67 In this case, the locking member 63 prevents movement.

The locking member 63 is attached to both walls 8 and 9 of the casing 4.
, a cross-shaped member 68 lying in a plane parallel to , one end of which is adapted to be received in a groove 69 on the housing 50 of the drive device.

As shown in FIG. 1, when the drive device is installed correctly, the locking member 63 is in a lower position than usual, so the protrusion 65 and the recess 66 are aligned, and the fuse carrier 29 is can move freely. Remove the drive device by lifting it upwards and then pulling it outwards, removing the dowel 60,
When the engagement state with 61 is released, the locking member 63
is returned to its original upper position by the action of the compression spring 64, so that the protrusion 65 and the protrusion 67 are aligned to prevent the fuse carrier 29 from moving.

The drive device also includes a separate locking device to prevent operation if it is not properly attached to the electrical device.

A locking arm 70 is pivotally attached to both sides of the housing 50 about a shaft 71 located below the central axis of rotation of the sleeve 51 .

Both arms 70 are fixed by manually engaging their upper ends 72 with the upper ends 74 of the plate member 73 through the housing 50 and the openings 75 provided at the top. A keyhole 77 is provided in the downward extension 76 that is the other end of the plate member 73.
is drilled.

The plate member 73 and the arm 70 are connected to the coil spring 7
9, the rod shaft 57 is held in the position shown in FIG. 4, and the rod shaft 57 is located within the circular hole portion of the keyhole 77 and can freely rotate. Due to this positional relationship, the shoulder portion 78 of the arm 70
is adjacent to the upper dowel 60 and serves as a locking means to prevent the drive device from being accidentally separated from the dowels 60 and 61.

To remove the drive device, the upper end 74
, and pull the plate member 73 and arm 70 in the direction of the operating member 56.

At this time, since the rod shaft 55 enters the rectangular portion of the keyhole 77, rotation of the shaft is prevented and the drive device cannot be operated.

By simultaneously moving the plate member 73 and the arm 70 in parallel, the drive device is moved to the casing 4.
can be installed on the device.

The operation for inserting a fuse into the lowest phase of the circuit in FIG. 1 will be described below.

First, when fuse carrier 29 is manually placed into position, slide 39 and slideway 40 engage. The locking element 63 prevents the fuse carrier 29 from being moved any further in the direction of the fixed contacts 16, 20.

The drive is then connected to the locking arm 7 as described above.
Move grooves 58 and 59 with dowels 60 and 61
The device is lowered to the uppermost position in FIG. 1 and the predetermined position shown in FIG.
Attach to.

This causes the protrusion 65 of the locking device 63 to align with the opening 66 so that the fuse carrier 29
can be moved. By mounting the drive housing 50 in the correct position with respect to each dowel 60, 61, at the same time the cam groove 52 is automatically and accurately located with respect to the pins 37, 38, and the four It engages with the pins 37 and 38 at the starting points 53 of the two symmetrical cam grooves.

Next, when the sleeve 51 is driven clockwise in FIG. 2 by operating the operating member 56 to apply force to the coil spring and release the force, the rotational movement is caused by the cam mechanism. Due to the action of
Since it is converted into a linear motion and transmitted to the fuse carrier 29, the contact point 3 on the fuse carrier 29
0 and 31 can be electrically connected to the fixed contacts 16 and 20.

When the locking arm 70 is released, the drive device can be easily lifted and removed from its position, but at the same time the locking member 63 acts and the fuse carrier 29 cannot be pulled out.

In this way, contact 3 on the fuse carrier
0, 31 and the fixed contacts 16, 20 can be operated at a position sufficiently distant from the area where they actually connect, so that they are sufficiently protected from the influence of arcs.

Further, by giving the housing 50 an appropriate shape,
the products of the arc are discharged from the sides and rear of the housing 50 rather than from the front;
It can provide even more protection.

Furthermore, the mechanical action of the spring and the reliable fuse guiding mechanism ensure that the electrical connection of the fuse is made quickly and reliably, thus mitigating the effects of any failure. can.

When removing the attached fuse carrier 29, the same operation is simply repeated, but in this case, the end points of the two symmetrical cam grooves are engaged with the pins 37 and 38, In addition, by rotating the sleeve 51 counterclockwise, the fuse carrier 29 can be released.

Operational safety is increased by a locking device.

If, for some reason, the fuse carrier 29 is not fully connected or released when the operating member 56 is operated, the cruciform member 68 of the locking member 63 lifts the drive unit from the installed position. It will no longer be possible to remove it.
In this way, if there is an abnormality, it becomes obvious.

Due to the shape of the cam groove 52 and the mechanism that can reliably drive the sleeve 51 90 degrees in one operation, the sleeve 51 can be moved even when the fuse carrier 29 is in the open position or the closed position. can always be properly engaged with the pins 37, 38. In the case of successive drive operations in either direction, there is no need to readjust the drive each time.

For this purpose, the number of cam grooves does not necessarily need to be four. That is, regardless of the number of cam grooves, all their starting points are located on one common radial plane, all starting points are located on another common radial plane, and each cam groove The rotation angle of the sleeve that rotates in one operation, assuming that the starting point of the cam groove and the end point of adjacent cam grooves are located on a common axial plane, and the number of cam grooves is n. may be set to 360 degrees over n.

Even for large installations consisting of a large number of devices, each with a three-phase output line, only one drive is sufficient.

The frame that holds the busbar is usually grounded, and the drive device can be grounded with a wander lead of sufficient length, so it can be placed in any position. , can be engaged with a fuse carrier.

The use of a wander lead not only improves safety by grounding, but also prevents the drive from being accidentally removed from the equipment.

FIG. 8 shows a partially cut away view of another embodiment generally similar to the apparatus of FIGS. 1-3.

The insulating casing 81 includes a plurality of bus bars 82,
They are respectively supported at the rear part of a wall part 83 that connects both side plates of the casing so as to be spaced apart from each other in the vertical direction.

A fuse 86 is mounted within the compartment defined by upper horizontal extension 84 and lower horizontal extension 85 of wall 83 and connects contacts 87, 88 which are fixed in place within casing 81. Contact 87
The upper surface 89 of the contact 88 is on the same plane as the upper surface of the generatrix 82, and the lower surface 90 of the contact 88 is on the same plane as the upper surface of the casing 81.
The output conductor 91 is disposed on the same plane as the output conductor 91 supported by the output conductor 91 .

On each inner wall of the opposing walls of the casing 81 there are respectively an upper slideway 92 and a lower slideway 93, on which an insulating carrier 94 slides into and out of the compartment containing the fuse. Insulated carrier 94 supports upper strip conductor 95 and lower strip conductor 96 .

The strip conductor 95 has contacts 97, 98, and when the insulating carrier 94 is in the position shown in FIG.
Each engages with the bus bar 82 and the upper surface 89 to close the space between them and form a circuit. Similarly, the strip conductor 96
has contacts 99 and 100, each having a lower surface 90.
and engages with the output conductor 91. In this way, output conductor 91 is connected to bus bar 82 via fuse 86 .

Moving the insulating carrier 94 to the left in FIG. 8 opens the circuit on both sides of the fuse 86. Insulated carrier 94 provided for each phase
can be driven between the above-mentioned closed position and open position by using the same driving device as in the first embodiment.

In reality, it is necessary to keep only the circuit on the output side of the fuse 86 closed, but in such a case, the contact 88 is deformed so as to be on the top of the output conductor 91, and the lower side Conductor 96 and its contacts 9
9, 100 can be removed from the insulating carrier 94.

As mentioned above, the electrical device and drive device according to the present invention can be used in various modifications.

The drive device of the above embodiment supports and drives the carrier at two points equidistant from the center on both sides of the carrier, so it runs stably and does not twist on the slide. There is nothing to do.

It is also possible to support and drive the carrier at only one point, its central position. Instead of driving each carrier separately, by attaching the three carriers used for the three phases included in one output to one common member and driving this member, the three carriers can be driven. Carriers can be inserted or removed at the same time.

The electrical device according to the invention can also be used with other drive devices in addition to those described above,
Changes or variations can also be made to the casing, fixed contacts and locking devices.

[Brief explanation of drawings]

FIG. 1 is a cutaway side view of a first embodiment of an electrical device and drive device according to the invention. Figure 2 shows
2 is a front view of the embodiment of FIG. 1; FIG. Figure 3 shows the first
2 is a plan view of the illustrated embodiment; FIG. FIG. 4 is a sectional view showing a state in which the drive device according to the present invention is installed. FIG. 5 is a partially enlarged view of one side wall of the electrical device according to the invention. FIG. 6 is a sectional view taken along the line - in FIG. 5. Figure 7 shows the line -
FIG. FIG. 8 is a partial perspective view of a second embodiment of the electrical device according to the invention. 1 to 3... bus bar, 4... casing, 5, 6...
...Casing member, 8, 9... Wall, 10... Opening, 11... Input contact, 12... Output contact, 1
3... Input contact, 15... Contact, 16... Fixed contact, 17, 18... Leaf spring, 19... Contact, 20... Fixed contact, 21, 22... Leaf spring, 23... ... Arc extinguisher, 24-26 ... Output conductor, 27, 28 ... Contact, 29 ... Fuse carrier, 32, 33 ... Bolt, 34 ... Fuse element, 35, 36 ... Shaft, 37, 38
... Pin, 39 ... Sliding part, 40 ... Slideway, 5
0...Housing, 51...Sleeve, 52...
Cam groove, 53...starting point, 54...end point, 55...
Case, 56... Operating member, 57... Rod shaft, 5
8, 59... Groove, 60, 61... Dowel, 62
... Guide path, 63 ... Locking member, 64 ... Compression spring, 65 ... Projection, 66 ... Recess, 67 ... Projection, 68 ... Cross-shaped member, 69 ... Groove, 70 ...
... Locking arm, 72 ... Upper end, 73 ... Plate member, 74 ... Upper end, 75 ... Opening, 76 ...
Lower extension, 77...Keyhole, 78...Shoulder, 79
... Coil spring, 81 ... Insulation casing, 82
... Bus bar, 83 ... Wall, 84 ... Upper horizontal extension, 85 ... Lower horizontal extension, 86 ... Fuse, 87, 88 ... Contact, 89 ... Top surface, 90 ...
...Lower surface, 91... Output conductor, 92... Upper slideway, 93... Lower slideway, 94... Insulated carrier, 95, 96... Strip conductor, 97, 98... Contact, 99, 100... Contact .

Claims (1)

[Scope of Claims] 1. A fixed casing 4 having an opening 10 that communicates with the inside; a pair of fixed contacts 11 disposed within the fixed casing 4 at a position recessed from the opening 10 and spaced apart from each other; 12; a contact carrier 29 having a pair of contacts 30, 31 thereon forming a contact area between the two electrically connected and spaced apart; said casing 4 and said contacts. carrier 29
The contact carrier 29 moves the inside of the casing 4 along a straight path to the opening 10 in cooperation with the
and a second position in which the contact area is engaged with the stationary contact to close a circuit. An electrical device for supply and distribution, comprising a cooperating guide device 39, 40 for guiding the contact carrier in movement, and a drive device for driving the contact carrier between the first and second positions, wherein the drive The device is a self-contained drive unit which is manually portable and includes a housing 50, said casing 4 and said drive housing 5.
0 is a first and second mounting member 58 that can cooperate with each other,
61, by means of which the drive unit can be installed lying outside the casing and releasably locked thereto against relative movement, and furthermore can be removed from the casing. The drive unit further comprises a drive member 51 movable in relation to the drive housing, a drive mechanism 55 for effecting such movement, and the drive unit mounted on the casing. An electrical device for power supply and distribution, characterized in that it comprises coupling devices 37, 38, 52 for detachably coupling the drive member to the contact carrier when the drive member is in use. 2. The guide devices 39, 40 connect the slideway 40 on the inner wall surface of the fixed casing 4 extending from the opening 10 toward the fixed contacts 11, 12, and the contact carrier 2.
9. Electrical device for power supply and distribution according to claim 1, characterized in that it comprises sliding means (39) attached to said slideway (9) and engaging said slideway (40). 3. Electrical device for power supply and distribution according to claim 1 or 2, characterized in that the contact area is electrically connected by a cartridge type fuse (34). 4. said contact area is directly connected to a contact for bridging said fixed contacts 11, 12 when said carrier is in a second position, said fixed contact being separated from an input contact and an output contact; 3. The electrical device for power supply and distribution according to claim 1, wherein the casing further comprises a fuse between the output contact and the output line. 5 Built-in locking devices 62 to 69 operate between the casing 4 and the carrier 29, and the locking devices operate between the first and second positions of the carrier. a locking state that prevents movement and also a release state that allows movement of the carrier between a first position and a second position;
5. Electrical device for power supply and distribution according to any one of claims 1 to 4, characterized in that it is released when the drive housing is in the installed position on the casing. 6 The drive member 51 is connected to the drive housing 5
0, said coupling device 3 is movable from one of a plurality of rest positions to an adjacent rest position;
7, 38, 52 can be coupled and disengaged only when the drive member is in the rest position, and the drive mechanism 55 operates between the drive housing 50 and the drive member 51 and is in the rest position. characterized in that said drive member can be driven by an equal movement in a selected one of two opposite directions in order to terminate the movement in a position adjacent to a rest position from any one of the two opposite directions. An electrical device for power supply and distribution according to any one of claims 1 to 5. 7. The contact carrier 29 has pins 37, 38 thereon, and the drive member 51 is rotatable with respect to the drive housing 50 from one rest position to an adjacent rest position and a cylindrical cylinder member having a plurality of cam means 52 formed in a cylindrical cylinder member, each of said plurality of cam means 52 making the same angle with respect to its axis, said axis also being rotational; and the cam means is removably coupled to the pins 37, 38, the cam means and the pins together forming a coupling means, each of the cam means being connected to the cylinder member. radially extending and having a starting point 53 in a first plane common to the starting points of all the cam means, parallel to said first plane and axially spaced apart; and has an operation end point on a second surface that is common to the operation end point of all the cam means, and the operation start point of each of the cam means and a common surface extending in the axial direction of the cylinder member 51 have a , a motion end point 54 is located, and the motion start point of each cam means and the motion end point immediately adjacent to the cam means are located on a common plane extending in the axial direction of the cylinder member 51, and the drive The mechanism 55 is configured to cause the cylinder member to terminate in a rest position which is proximate to the starting position by an angle equal to the equally looking angle from each rest position in the selected direction of either the hour hand or the counter-hour hand. 7. The electric power supply and distribution electrical device according to claim 6, wherein the electrical device performs a rotational operation. 8. The cam means consists of four cam grooves 52 formed through the cylindrical member 51, each forming an angle of 90° with respect to the axis of the cylindrical member. An electrical device for power supply and distribution according to claim 7. 9. The drive mechanism includes an operating member 56 and a biasable spring device between the operating member 56 and the drive member 51, and the spring device is biased no matter which direction the operating member rotates. wherein the spring device is relaxable when biased to drive the drive member in the same direction as the operating member is moved during biasing; An electrical device for power supply and distribution according to claim 7 or 8, characterized in that: