JPS6252405B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller contact device, in particular a
The present invention relates to a roller contact device configured using a so-called bridge type roller contact in which one roller contact contacts two fixed contacts.

In a roller contact device using a bridge type roller contact, a current path from one fixed contact, i.e., a first fixed contact, to the other fixed contact, i.e., a second fixed contact, is a current path from the first fixed contact to the first fixed contact. It is formed by a path that sequentially passes through the contact point between the fixed contact and the roller contact, the roller contact, and the contact point between the roller contact and the second fixed contact, and then reaches the second fixed contact, with only the roller contact as an inclusion. It has the feature of being configured. In other words, this is because the contact sliding part between the roller contact and the roller shaft that rotatably supports it, or the bearing provided between them is not present in the current path, so the electric current in the contact sliding part is not interposed in the current path. It is characterized by the fact that there is no eclipse and the smooth rotation of the roller contact can be maintained indefinitely.

However, when it is required to increase the current carrying capacity of such a roller contact device, it is usual to install a plurality of roller contacts in the axial direction or in a parallel connection in a direction perpendicular to the axial direction. However, in such cases, it is extremely difficult to achieve this with only a small increase in space. For example, if two roller contacts are used, the attached drawing No. 1 shows the case where two roller contacts are used.
As shown in the figure, when two sets of the first and second fixed contacts 1 and 2 and the roller contact 3 are arranged in the axial direction of the roller contact 3, the axial dimension is doubled. Furthermore, as shown in FIG. 2, when two roller contacts 3 are arranged in a direction perpendicular to the axial direction thereof, for example, in the direction of movement A, the planar dimension in the direction of movement A is doubled. In either case, the space increases by the number of roller contacts used.

In addition, in order to increase the current carrying capacity, it is possible to widen the width of the fixed contact and also to widen the contact width of the contact ring of the roller contact to the fixed contact, but how to manufacture the fixed contact and the roller contact accurately However, due to processing and installation errors, the contact surfaces of both fixed contacts always have a slight error in parallelism, and the contact surfaces of the contact rings on both sides of the roller contact also have a slight error in parallelism. There is no escape from parallelism errors. As a result, the contact surface of the roller contact is slightly inclined with respect to the contact surface of the fixed contact, and therefore, the effective contact width that should be energized is very small, even though the width has been increased. This results in an excessive amount of current per unit width, which has the disadvantage of causing burn-in and the like.

The present invention aims to provide a roller contact device that eliminates the drawbacks of such conventional devices.
In order to achieve this purpose, a plurality of roller contacts are fitted such that the body of each roller contact is fitted substantially coaxially and in a multi-cylindrical manner, and the body of the inner roller contact is inserted loosely into the hollow hole formed in the center of the outer roller contact and the hole in the holder that supports it, and both contact rings of the inner roller contact are connected to the contact rings at both ends of the outer roller contact. It is characterized in that it is arranged so as to be located on each outer side in the axial direction of the section.

Hereinafter, the present invention will be explained based on FIG. 3 of the accompanying drawings showing one embodiment thereof.

In the figure, numeral 1 is the first fixed contact, 2
3 is a second fixed contact, 3 is a first roller contact, and the first and second fixed contacts 1,
2, a coaxial center and a contact ring portion 3 of the same diameter contact each other.
1 and 32, and a body portion 3 which mutually connects the contact ring portions 31 and 32 and has a hollow hole 331 formed in the center thereof.
It is composed of 3. Further, the first roller contact 3 has self-aligning bearings 61 and 6 at both ends thereof.
2, it is tiltably and rotatably supported by holders 51 and 52.

Reference numeral 4 indicates the contact ring portions 31 and 32 of the first roller contact 3 and the holder 51 that supports the contact ring portions 31 and 32.
mutually coaxial centers located on both outer sides of 52 and in contact with the first and second fixed contacts 1 and 2, respectively;
Contact ring parts 41 and 42 of the same diameter, hollow hole 331 of first roller contact 3 and holders 51 and 52
a body part 43 that freely passes through holes 511 and 521 formed in the contact ring parts 41 and 521 and that connects both contact ring parts 41 and 42 to each other and has a hollow hole 432 formed in the center thereof; For assembly, the body part 43 has a connecting part 431 in the middle thereof so that it can be separated and connected in the axial direction, and is tightly integrated with a bolt 44 and a nut 45 passing through a hollow hole 432. Although these connections are designed to function as one complete roller contact, these connections may, of course, be made by other known means, such as by connecting the connection portion 431 with male and female threads. In this case, it is still possible to provide the third roller contact in the hollow hole 432, and if redisassembly is not considered, it may be integrated by friction welding or electric resistance welding. good. Further, the second roller contact 4 is tiltably and rotatably supported by the holders 53 and 54 via self-aligning bearings 63 and 64 at both ends of the bolt to which it is integrated by tightening. There is.

Note that the hollow hole 33 of the first roller contact 3
1 and holes 511, 521 of holders 51, 52
and the body portion 43 of the second roller contact 4.
The first roller contact 3 and the second roller contact 4 that occur due to unevenness of the contact surface of the contact surfaces and manufacturing errors in the outer diameters of the contact ring portions 31, 32, 41, 42 of the first and second roller contacts 3, 4, etc. The value is set to be larger than the mutual eccentricity between the two.

Next, the other ends of the holders 51, 52, 53, 54 are connected to guide holes 81, 8 provided in the drive arm 8 that moves in a direction perpendicular to the plane of the paper in FIG.
The holders 51, 52, 53, 54 are slidably inserted into the holders 51, 52, 53, and 84 respectively in the direction of the arrows.
The collar 513 is fixedly provided to each of the
Pressing springs 71, 72, 73, 74 are provided between the drive arm 8 and the respective holders, that is, the roller contacts 3, 523, 533, 543, respectively.
4 to the first and second fixed contacts 1 and 2 individually to bring the contact ring parts 31 and 41 into contact with the first fixed contact 1 and contact the contact ring parts 32 and 42 with the second fixed contact 2. In addition, when both roller contacts 3 and 4 come to a place where both fixed contacts 1 and 2 are not present due to the movement of drive arm 8, each holder 51, 52, 53, and 54 is prevented from slipping out from drive arm 8. In addition, stoppers 512, 522, 532, and 542 are provided on the respective holders 51, 52, 53, and 54.

The present invention is configured as described above, and its operation will be explained next.

When energizing, the first
The roller contact 3 and the second roller contact 4 have respective holders 51, 52, 53,
54, respectively, the first,
The pressure springs 71, 72, 7 rest on the second fixed contacts 1, 2 without contacting or interfering with each other due to the loose gap between the two roller contacts 3, 4.
3 and 74, the contact ring portions 31 and 41 of the first and second roller contacts contact the first fixed contact 1, and the contact ring portions 32 and 42 contact the second fixed contact 2, Power can be applied. Therefore, the energizing current is passed through the energizing path via the first fixed contact 1, the first roller contact 3, and the second fixed contact 2, and the energizing path via the first fixed contact, the second roller contact, and the second fixed contact 2. It flows depending on the electric path.

In addition, when the current is to be cut off, the drive arm 8 is moved in the opposite direction to the above, and both roller contacts 3 and 4 are moved via the holders 51, 52, 53, and 54, and both roller contacts 3 and 4 are moved. Contacts 3 and 4 are the first and second fixed contacts 1 and 2
In this case, both roller contacts 3, 4 are moved leftward in the figure by the push springs 71, 72, 73, 74, but the stoppers 512, 522, 53
2,542, the movement is stopped by a certain amount,
Both roller contacts 3 and 4 are placed in a state where they can be inserted again.

As described above, according to the device of the present invention, the first and second
The roller contacts 3 and 4 can independently contact the first and second fixed contacts 1 and 2 to bridge them without interfering with each other. That is, the purpose of bridging two fixed contacts in parallel using two roller contacts can be achieved. Moreover, these require only a very small increase in the axial dimension, which is the sum of the width of the upper and lower contact ring parts 41 and 42 of the second roller contact and the width of the support parts of the upper and lower holders 51 and 52. As a trade-off, the device of the invention has the advantage of being able to cope with increased current carrying capacity with only a slight increase in axial dimension.

In the above embodiment, self-aligning bearings 61, 62, 63, 64 are provided between the bolts 44 of the first roller contact 3 and second roller contact 4 and each holder 51, 52, 53, 54. In addition, one roller contact is supported by a pair of holders that can move independently of each other, but in both cases, if the contact surfaces of both fixed contacts are not coplanar, The roller contact is designed to be able to tilt so that bridging contact can be reliably achieved even in the case of contact. If there is no such thing, or if there is none at all, it is also possible to support it by a non-self-aligning bearing, or by a non-independent integral holder. However, even in such a case, since there is a slight gap between each part of the support, it is possible to tilt the roller contact accordingly.

It is also possible to make the bolt 44 that fastens the second roller contact hollow, and to arrange a third roller contact therein in the same way as the second roller contact for the first roller contact. According to the method of providing male and female threads in the body connection portion described in the description of the bolt 44 above, it is possible to always arrange the required number of roller contacts coaxially.

Furthermore, in the above embodiment, the contact surfaces of the fixed contacts were made to be the same plane and the contact ring portions were made to have the same diameter, but the diameter of the contact ring portion of each roller contact is different from that of each roller. There is no problem even if the contact surface of the fixed contact is configured to be different for each contact, and to correspond to this, the contact surface of the fixed contact can be configured in steps or in layers.

In this way, the device of the present invention can increase the number of roller contacts to be used in parallel with a small increase in space, so it is possible to increase the capacity of the roller contact device without increasing the size of the device. In addition, even if the contact parts of the roller contact and the fixed contact are not completely on the same surface due to processing accuracy and installation accuracy, the contact at each contact part can be optimally made.
The total length of each contact portion has the effect of increasing the desired contact length and increasing the current carrying capacity.

[Brief explanation of the drawing]

FIG. 1 is an explanatory plan view showing an example of a case where a plurality of bridge-type roller contacts are used;
The figure is an explanatory perspective view of another example, and FIG. 3 is a longitudinal sectional view of one embodiment of the present invention. 1... First fixed contact; 2... Second fixed contact; 3... First roller contact; 4...
...Second roller contact; 31, 32, 41, 42...
Contact ring part; 33, 43...Body part; 44...Bolt; 4
5... Nut; 51, 52, 53, 54... Holder; 331... Hollow hole; 511, 521...
hole.

Claims (1)

[Scope of Claims] 1. A first and second fixed contact, a pair of mutually coaxial and identical diameter contact rings that contact the first and second fixed contacts, and this pair of contact rings. In a roller contact device having a plurality of roller contacts, each having a body portion that connects the roller contacts, and a holder that supports each of the plurality of roller contacts, the plurality of roller contacts are arranged such that the body portions of each roller contact are substantially coaxial. They are fitted into each other centrally and in a multi-cylindrical manner, with the body of the inner roller contact loosely penetrating the hollow hole formed in the center of the outer roller contact and the hole of the holder that supports the hollow hole. A roller contact device characterized in that both contact ring portions of the inner roller contact are provided so as to be located on the respective outer sides in the axial direction of the contact ring portions at both ends of the outer roller contact. 2. The roller contact device according to claim 1, wherein the contact ring portions of each roller contact all have the same diameter. 3. The roller contact according to claim 1 or 2, wherein the roller contact having another roller contact on the outside has a connecting part configured to be separable and connectable between the pair of contact ring parts. Roller contact device.