RU2584877C2 - Device for electric current interruption with simple structure - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: apparatus for electric current breaking consists of case (1), fixed contact (21), sliding carriage (3), bearing movable contact (22), activation means (5) for carriage movement when movable contact near fixed contact and retention device (6) for temporary retention of carriage position, in which fixed and movable contacts are separated from each other, while the activation unit compresses spring at its free carriage and enable mutual compression of fixed and movable contacts. Retainer comprises arm (61) and latch (62), pivotally mounted on carriage (3). Latch interacts with arm (61) to hold carriage during spring compression and subjected to turn it, which enables to move from shoulder, as soon as spring is sufficiently is compressed.

EFFECT: technical result is simple, reliable and reproducible operation of retaining contacts in position when they are separated from each other.

10 cl, 14 dwg

Description

The invention generally relates to the field of electrical equipment.

More specifically, the invention relates to a device for interrupting electric current, such as a switch-disconnector, comprising:

housing;

at least a fixed contact attached to the housing;

a carriage slidably mounted in the housing along the axial direction from an inactive position, through a holding position, to an end position of mutual closure;

a movable contact mounted with the possibility of sliding in the carriage along the axial direction, which abuts against the carriage stop in its inactive position and in the holding position and which is superimposed on each fixed contact in the final position of the carriage mutual closure;

a first spring located in the carriage, pre-stressed by compression, and having a first end that is applied to the movable contact in the axial direction, the elastic force being directed to the stationary contact;

activation means containing an eccentric and a connecting link, the first end of which is connected to the eccentric, such activation means can be moved outside the housing from the rest position in the direction of the final position of mutual closure through the engagement position and the release position, and configured to axially selectively apply to the second the end of the first spring and through the second end of the connecting link, a force directed in the direction of the fixed contact, which allows lichit compression of the first spring;

and a holding means comprising a holding element connected to the housing and configured to maintain the carriage in its holding position for any position of the activation means, in the range from its engagement position to its release position, and to release the carriage as soon as the activation means crosses its position release, the carriage suddenly moves in the direction of its final position of mutual closure as a result of the partial expansion of the first spring.

A device of this type, for example, is described in US Pat. No. 7,115,829.

In a device of this type, in the manufacture of a containment device, it is subject to two contradictory restrictions, which are represented, on the one hand, by the need to provide a reliable and reproducible operation for this device, and, on the other hand, the desire to obtain the quality of this operation using a structure that is as simple as possible.

In this context, the invention is directed to providing a device for interrupting an electric current, such as a switch-disconnector, the holding means of which very effectively satisfy this need.

To this end, the interrupt device in accordance with the invention, which further meets the general definition presented in the above introductory part, is essentially characterized in that the holding element connected to the housing consists of a housing shoulder, in that the holding means further comprises a latch pivotally mounted on the carriage around the pivot axis, that the latch comprises at least a first cam element extending obliquely with respect to the axial direction, and a supporting surface, inter adjacent to said shoulder, to maintain the carriage in its holding position, that the second end of the connecting link interacts with the first cam element to ensure that the activation means moves from its engagement position to its release position, corresponding to the rotation of the latch in the first direction about its axis of rotation, and that said supporting surface of the latch moves away from the shoulder of the housing as soon as the activation means crosses its release position.

In a clear manner, essentially, the first spring may be composed of a coil spring.

Preferably, the second end of the link extends laterally to the axial direction and presses directly on the second end of the first spring.

In addition, the shoulder is formed integrally with the bottom wall, where a housing is usually provided.

In particular, in this case, the rear side of the carriage can be installed so that it faces the bottom wall of the housing, and on which the latch is pivotally mounted.

Thus, it is advisable to provide the rear side of the carriage so that a slot is formed in it parallel to the axial direction, so that the second end of the connecting link intersects this slot, and that this slot is designed, at least in terms of its size, so so that it provides the ability to direct the second end of the connecting link in the axial direction.

The front side of the carriage may also be parallel and at a distance from its rear side, and its front side may also intersect with the second end of the connecting link.

In a preferred embodiment of the invention, it is provided that the first latch cam element is mounted between the pivot axis and the support surface of this latch, that the latch comprises a second cam element extending substantially parallel to the first cam element and is located between said first cam element and the latch pivot axis , and that the second end of the connecting link interacts with the second cam element to provide, while the carriage moves from its final floor When the latch interlocks to its inactive position, corresponding to the rotation of the latch in the second direction around its axis of rotation, again setting the supporting surface of the latch in the latched gear position with the housing shoulder.

The latch, for example, has a hole that is bounded by a closed edge and is located between the axis of rotation and the supporting surface of the latch, each cam element of the latch can thus be defined as a portion of the edge of the hole.

As is known, such an electric device for interrupting an electric current may also contain a second spring, previously prestressed, being compressed between the housing and the carriage, this second spring constantly biases the carriage in the direction of its inactive position.

Other characteristics and advantages of the invention will be apparent from reading the following description, which is presented only as a reference material and is in no way restrictive, with reference to the attached drawings, in which:

in FIG. 1 is an exploded perspective view of a device in accordance with a possible embodiment of the invention;

in FIG. 2 shows an enlarged perspective view of the functional subassembly of the device of FIG. 1, this subassembly, in particular, contains a carriage, which can be seen from its front side;

in FIG. 3 shows an enlarged perspective view of the functional subassembly of the device of FIG. 1, this subassembly, in particular, comprises a carriage, which can be seen from its rear side, on which a latch is provided;

in FIG. 4 is a view illustrating the subsystem seen in FIG. 3, in the form as before installing the latch on the carriage;

in FIG. 5 shows a partial side view of a device according to a possible embodiment of the invention, in the form of the activation means in the resting position and from the front of the carriage;

in FIG. 6 is a partial side view of the device of FIG. 5, in the resting state of the activation means and from the rear of the carriage;

in FIG. 7 is a partial side view of the device of FIG. 5 and 6, in the engagement view of the activation means and on the front of the carriage;

in FIG. 8 is a partial side view of the device of FIG. 5-7, in the engagement view of the activation means and from the rear of the carriage;

in FIG. 9 is a partial side view of the device of FIG. 5-8, observed in the intermediate position of the activation means between its engagement position and its release position, and from the front of the carriage;

in FIG. 10 is a partial side view of the device of FIG. 5-9, observed in an intermediate position of the activation means between its engagement position and its release position, and from the rear side of the carriage;

in FIG. 11 is a partial side view of the device of FIG. 5-10 observed in an extremely short state corresponding to the release position of the actuation means and on the front side of the carriage;

in FIG. 12 is a partial side view of the device of FIG. 5-11, observed in an extremely short state corresponding to the release position of the activation means, and from the rear of the carriage;

in FIG. 13 is a partial side view of the device of FIG. 5-12, observed in the final position of the mutual closure of the activation means, and from the front of the carriage;

in FIG. 14 is a partial side view of the device of FIG. 5-13, observed in the final position of the mutual closure of the activation means, and from the rear of the carriage.

The main elements presented in these drawings and referred to in the present description are marked with reference numerals in brackets or not, while reference numerals in brackets are assigned for assemblies to which elements marked with reference numbers without brackets belong.

As indicated above, the invention relates to a device for interrupting electric current, such as a switch-disconnector.

Such a device comprises, in a known manner, a housing 1, one or more fixed contacts 21 attached to the housing 1, a movable contact 22, a carriage 3, a spring 41, an activation means 5 and a holding means 6.

The carriage 3 is slidably mounted in the housing 1 along the axial direction Z vertically shown in FIG. 2-14 from the inactive position shown in FIG. 5 and 6, through the holding position, which is shown in FIG. 7-10, to the end position of the mutual closure, which is shown in FIG. 13 and 14.

Secondly, such a device usually also contains a second spring 42, pre-stressed, being compressed between the housing 1 and the carriage 3, this second spring 42 consists, for example, of a spiral spring and constantly biases the carriage 3 in the direction of its inactive position.

Such a movable contact 22 is mounted in the carriage 3 with the possibility of sliding along the axial direction Z.

Such a movable contact 22, abutting against the abutment 30 of the carriage 3 in the inactive position (Figs. 5 and 6) and in the holding position (Fig. 7-10) of such carriage 3, however, is superimposed on each stationary contact 21 in the final position of the mutual closure of the carriage 3 (FIGS. 13 and 14).

A spring 41, which preferably also consists of a coil spring, is housed in the carriage 3 and is prestressed while being compressed.

The end 411 of the spring 41, i.e. the lower end of this spring in the drawings, thus applies an elastic force to the movable contact 22 and along the axial direction Z directed to the fixed contact 21, i.e. in the downward direction in FIG. 2-14. Such an elastic force is therefore the opposite of the force exerted by the spring 42, but is of greater importance.

The function of the activation means 5, which comprises an eccentric 51 and a connecting link 52, is to increase the compression ratio of the spring 41 so that it can move the carriage 3 from its inactive position in the direction of its final position of mutual closure, overcoming the oppositely directed reverse force applied to the carriage 3 by a second spring 42.

To this end, the eccentric 51, which is mounted to rotate in the housing 1 around its spindle 510, is made with a handle 511, which can be moved outside the housing 1.

In addition, the connecting link 52 has an end 521 kinematically connected to the eccentric 51, and an end 522 acting on the end 412 of the spring 41, i.e. at the higher end of the spring 41, in the arrangement shown in FIG. 2-14.

The action of the handle 511, which is pulled outward from the housing 1, therefore, allows for the rotation of the eccentric 51 around its spindle 510 and the sliding of the connecting link 52.

More precisely, the eccentric 51 and the connecting link 52 can thus simultaneously move from the rest position, which is shown in FIG. 5 and 6, in the direction of the end position of the mutual closure, which is shown in FIG. 13 and 14, in particular, passing through the engagement position, which is shown in FIG. 7 and 8, and the release position shown in FIG. 11 and 12.

During such a movement, the activation means 5 acts on the end 412 of the spring 41 through the end 522 of the connecting link 52 and along the axial direction Z with a force that is directed in the direction of the fixed contact 21, i.e. downward in FIG. 2-14, and which has the effect of increasing the compression ratio of the spring 41 from the engagement position of this activation means shown in FIG. 7 and 8.

The retention means 6, which contains the retention element 61 connected to the housing 1, is configured to support the carriage 3 in its retention position (Fig. 7-10) in any position of the activation means 5 in the range from its engagement position (Fig. 7 and 8 ) and its release position (FIGS. 11 and 12) and for the release of the carriage 3 when the activation means 5 crosses its release position (FIGS. 11 and 12).

When the activation means 5 crosses its release position, the carriage 3 suddenly moves in the direction of its final position of mutual closure by partially expanding the spring 41 already highly prestressed by this activation means 5.

In this context, the contribution of the invention mainly relates to the simplification of the retention means 6.

According to the invention, the holding element connected to the housing 1 consists of a housing shoulder 61, and such holding means 6 further comprise a latch 62 pivotally mounted on the carriage 3 about the rotation axis X, preferably transversely to the axial direction Z.

The latch 62 comprises (Fig. 3) a cam element 621 that extends obliquely with respect to the axial direction Z and a support surface 623 that interacts with the shoulder 61 to support the carriage 3 in its holding position.

Between the rest position (Figs. 5 and 6) and the engagement position (Figs. 7 and 8) of the activation means 5, the spring 42 is constantly compressed, and the supporting surface 623 of the latch 62 moves closer to the shoulder 61 until it comes into contact with him in the gearing position of this activation means 5.

Then, the abutment of the abutment surface 623 against the shoulder 61 allows the carriage 3 to be held in its holding position, while the activation means 5, once it has reached its engagement position, continues to move in the direction of its release position, as shown in FIG. 9 and 10, and sequentially compresses the spring 41.

In addition, the end 522 of the connecting link 52 interacts with the cam member 621 in order to provide, while the activation means 5 extends from its engagement position to its release position, corresponding rotation of the latch 62 in the release direction D about its rotation axis X ( Fig. 10).

This hinge is dimensioned such that when the activation means 5 crosses its release position (FIG. 12), the support surface 623 of the latch 62 moves away from the shoulder 61 of the housing 1, thereby enabling the carriage 3 to suddenly move under the action of the spring 41 in the direction its final position of mutual closure.

In fact, as shown in FIG. 8, 10, and 12, the cam member 621 may be configured such that the end 522 of the link 52 only allows the latch 62 to rotate from the intermediate position shown in FIG. 10, that is, only in close proximity to the end of the passage of the activation means 5 from its engagement position in the direction of its release position.

Preferably, as shown in particular in FIG. 1, the ends 521 and 522 of the connecting link 52 extend at the same time transverse to the axial direction Z and transverse to the middle portion of the connecting link that connects these ends.

Thus, it becomes possible to ensure that the end 522 of the connecting link 52 presses directly on the end 412 of the spring 41 without using any additional part.

Preferably, the shoulder 61 may be formed on the bottom wall 10 provided in the housing 1.

The latch 62, for example, is pivotally mounted on the rear side 31 of the carriage 3, that is, on the side of the carriage 3, which is placed so that it faces the bottom wall 10 of the housing 1.

In this case, it is preferable that the end 522 of the connecting link 52 also intersects the front side 32 of the carriage 3, that is, the side of the carriage, which is parallel and at a distance from the rear side 31.

It may also be advisable to ensure that a slot 310 is formed on the rear side 31 of the carriage 3 parallel to the axial direction Z, and that this slot 310 intersects the end 522 of the connecting link 52, in order to ensure the direction of this end 522.

To optimize the stability of the latch 62 and reduce the size of the holding means 6, the latch cam 621 is preferably located between the pivot axis X and the supporting surface 623 of this latch 62.

The latch 62 may also include another cam element 622, which extends at least approximately parallel to the cam element 621 and which is located between this cam element 621 and the rotation axis X of the latch 62.

The end 522 of the connecting link 52 can thus cooperate with this second cam element 622 to ensure that the carriage 3 passes from its final interlocked position to its inactive position, corresponding to a rotation of the latch 62 in the direction of the fuse A about its rotation axis X ( Fig. 3), this rotation allows you to change the position of the supporting surface 623 of the latch 62 in the position of the hidden connection with the shoulder 61 of the housing 1 without the use of an additional spring.

In FIG. 3 also shows that the latch 62 can be provided with an opening 620 that is bounded by a closed edge and is located between the pivot axis X and the supporting surface 623 of this latch 62, so that each of the cam elements 621 and 622 of such a latch can be defined by a portion, corresponding to the edge of this hole 620.

Claims (10)

1. Device for interrupting electric current, such as a switch-disconnector, containing:
building 1);
at least one fixed contact (21) attached to the housing (1);
a carriage (3) mounted slidably in the housing (1) along the axial direction (Z) from an inactive position, through a holding position, to an end position of mutual closure;
a movable contact (22) mounted for sliding in the carriage (3) along the axial direction (Z), abutting against the stop (30) of the carriage (3) in its inactive position and in the holding position and superimposed on each fixed contact (21) in end position of mutual closure of the carriage (3);
a first spring (41) located in the carriage (3), pre-stressed by compression and having a first end (411) that applies an elastic force to the movable contact (22) in the axial direction (Z) directed to the fixed contact (21) ;
activation means (5) comprising an eccentric (51) and a connecting link (52), the first end of which (521) is connected to the eccentric (51), and this activation means (5) can move from the outside of the housing (1) from the rest position in the direction the final position of the mutual closure through the engagement position and the release position, and configured to selectively apply in the axial direction (Z) to the second end (412) of the first spring (41) by means of the second end (522) of the connecting link (52), the force directed to motion direction contact (21), which allows to increase the compression of the first spring (41);
and a holding means (6) comprising a holding element (61) connected to the housing (1) and configured to hold the carriage (3) in its holding position for any position of the activation means (5) in the range from its engagement position to its position the release and release of the carriage (3), as soon as the activation means (5) crosses its release position, the carriage (3) thus suddenly moving in the direction of its final position of mutual closure as a result of the partial expansion of the first spring (41),
characterized in that the holding element connected to the housing (1) consists of a shoulder (61) of the housing, and that the holding means (6) further comprises a latch (62) pivotally mounted on the carriage (3) around the axis (X) rotation, and the fact that the latch (62) contains at least a first cam element (621) extending obliquely with respect to the axial direction (Z) and a supporting surface (623) interacting with said shoulder (61) to maintain the carriage (3) in its holding position that the second end (522) of the connecting link (52) interacts with the first cam element (621) to ensure that the activation means (5) passes from its engagement position to its release position corresponding to a rotation of the latch (62) in a first direction (D) about its rotation axis (X), and that said support the surface (623) of the latch (62) moves away from the shoulder (61) of the housing (1) when the activation means (5) crosses its release position. 2. An electric current interruption device according to claim 1, characterized in that the first spring (41) is a coil spring. 3. An electric current interruption device according to any one of the preceding paragraphs, characterized in that the second end (522) of the connecting link (52) extends transversely to the axial direction (Z) and presses directly on the second end (412) of the first spring (41). 4. The device for interrupting electric current according to claim 1 or 2, characterized in that the housing (1) has a lower wall (10) and that the shoulder (61) is formed integrally with the lower wall (10). 5. An electric current interruption device according to claim 4, characterized in that the carriage (3) has a rear side (31) located so that it faces the bottom wall (10) of the housing (1), and that the latch (62) ) pivotally mounted on the rear side (31) of the carriage (3). 6. An electric current interruption device according to claim 5, characterized in that the rear side (31) of the carriage (3) has a slot (310) parallel to the axial direction (Z), so that the second end (522) of the connecting link (52) intersects this slot (310) and that this slot (310) is configured to guide the second end (522) of the connecting link (52) in the axial direction (Z). 7. An electric current interruption device according to claim 6, characterized in that the carriage (3) has a front side (32) located parallel to and at a distance from its rear side (31), and that this front side (32) also intersects the second end (522) of the connecting link (52). 8. The electric current interruption device according to claim 1, characterized in that the first cam element (621) of the latch (62) is located between the axis of rotation (X) and the supporting surface (623) of this latch (62), that this latch (62) comprises a second cam element (622) extending substantially parallel to the first cam element (621) and is located between said first cam element (621) and the pivot axis (X) of the latch (62), and that the second end (522) of the connecting link (52) interacts with the second cam element (622) to ensure that the carriage (3) passes from its final position of mutual closure to its inactive position, corresponding to the rotation of the latch (62) in the second direction (A) around its axis (X) of rotation, again setting the supporting surface (623) of the latch (62) in the position of the latched gear with the shoulder ( 61) housing (1). 9. An electric current interruption device according to claim 1, characterized in that the latch (62) has an opening (620) bounded by a closed edge and located between the axis of rotation (X) and the supporting surface (623) of this latch (62), and that each cam element (621, 622) of the latch (62) is defined by a portion of the edge of said opening (620). 10. The device for interrupting electric current according to claim 1, characterized in that it contains a second spring (42), prestressed by compression between the housing (1) and the carriage (3), and this second spring (42) constantly biases the carriage ( 3) in its inactive position.

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