Patent Application
20120186955
The present application hereby claims priority under 35 U.S.C. §119 to German patent application number DE 10 2011 003 131.6 filed Jan. 25, 2011, the entire contents of which are hereby incorporated herein by reference.
At least one embodiment of the invention generally relates to an electric switch, in particular an electric circuit-breaker.
Such a switch is known from the German patent publication DE 10 2008 039 066 A1. This switch comprises a rotor housing and an electric contact arm, rotatably mounted in the rotor housing, the contact arm being pivotable between an on-position and an off-position as well as relative to the rotor housing. In the on-position, the electric contact arm connects a contact element of the contact arm to a stationary contact element of the switch. In the off-position, the contact element of the contact arm and the stationary contact element of the switch are separated. For switching on and off, the contact arm can be pivoted by rotating the rotor housing; the rotating rotor housing carries the contact arm with it and also pivots the contact arm. In addition, the contact arm can pivot even without a rotation of the rotor housing, i.e. relative to the rotor housing, namely if the current flowing via the contact arm becomes too great: in this case, the contact arm is pivoted relative to the rotor by way of a magnetic force induced by the current, the contact element of the contact arm and the stationary contact element of the switch being separated from one another as a result.
In one of the embodiments described in the German patent publication DE 10 2008 039 066 A1, two intermediate parts are present which, in a predefined locking position, lock the pivotable contact arm with the rotor housing and, in the event of a relative rotation between the pivotable contact arm and the rotor housing, are moved away from the predefined locking position. Each of the two intermediate parts consists of a pressure element which is pivotably connected at one end to a pivot bearing of the contact arm and at another end holds a roller via a rotation bearing. The roller can roll on a wall section of the switch.
In at least one embodiment of the invention, a switch is specified which has few parts and a particularly easy-to-assemble design.
Advantageous embodiments of the switch are specified in subclaims.
It is provided according to at least one embodiment of the invention that the intermediate part is a spherical body which, in the predefined locking position is held in a resiliently clamped manner. Spherical bodies are understood here to mean bodies whose surface is spherical or spheroidal.
A substantial advantage of the switch according to at least one embodiment of the invention is its simple mechanical design and the resulting ease of assembly. In contrast to the switch described in the introduction, in which each intermediate part comprises one pressure element, one roller and two rotation bearings, the intermediate part in the switch according to the invention is formed by a spherical body which can be held only by way of clamping—i.e. with no mechanical connection to other parts. For assembly, the spherical body can merely be inserted between the pivotable contact arm and the rotor housing and clamped there. Fewer parts are thus required for the locking mechanism between the pivotable contact arm and the rotor housing, which reduces the manufacturing and assembly costs significantly.
A further substantial advantage of the switch according to at least one embodiment of the invention is that, due to the spherical shape of the intermediate part, it is possible to rotate the contact arm with very little friction and thus also with very small trip forces and/or very small trip currents. This makes it possible to achieve current limitation even when there are “no” short-circuit currents and at the same time to reduce burning of the contacts, as the contacts can be opened with no appreciable delay.
The intermediate part is preferably a hollow body with a spherical or ellipsoidal surface or a solid spherical body or a solid ellipsoid.
With a view to providing good thermal insulation between the rotor housing and the contact arm and to preventing arcing between the contact arm and the rotor housing, it is considered advantageous for the intermediate part to be composed of a non-conductive material.
The predefined locking position can be arranged such that the switch is closed when the intermediate part is held in the predefined locking position in a resiliently clamped manner. Alternatively, the predefined locking position can be arranged such that the switch is open when the intermediate part is held in the predefined locking position in a resiliently clamped manner. Multiple different locking positions can also be provided, for example one for the open switch state and one for the closed switch state.
With a view to achieving a favorable distribution of force, it is considered advantageous for at least two intermediate parts to be provided. The arrangement of the intermediate parts between the rotor housing and the contact arm is preferably rotationally symmetrical.
In the event of a pivoting of the contact arm relative to the rotor housing, the intermediate part is preferably pressed out of the locking position. The locking position is preferably formed by a recess (e.g. in the form of a hole, a blind hole or an indentation) in a wall section. During a further relative rotation between the contact arm and the rotor housing—i.e. after leaving the locking position and/or the recess—the intermediate part rolls and/or slides preferably on this wall section.
On the wall section, indentations are preferably provided which brake the rolling and/or sliding of the intermediate part on the wall section. Such indentations make it possible to control the pivoting movement, in particular the pivoting speed in the event of an overcurrent, in a targeted manner by choosing the geometry and the density of the indentations appropriately.
A spring is preferably arranged between the rotor housing and the pivotable contact arm. In order to achieve the locking position, a first spring end of the spring presses the intermediate part preferably into the recess in the wall section. The second spring end of the spring is preferably braced against the contact arm.
According to at least one embodiment, the first spring end presses directly onto the intermediate part, and the second spring end of the spring is braced directly against the contact arm.
The wall section is preferably formed by a wall section of the rotor housing. It is considered particularly advantageous in this regard if the rotor housing has a housing shell with an edge section whose inner edge surface forms the wall section on which the intermediate part can roll or slide and in which the recess for the locking position is positioned.
It is additionally considered advantageous if the rotor housing has a lid which laterally closes the rotor housing with the contact arm located therein. The lid lies preferably directly on the intermediate part. With a view to achieving low friction, it is considered advantageous if the intermediate part—in the event of a relative movement between the pivotable contact arm and the rotor housing—can also roll and/or slide on the lid, in particular can slide with low friction.
The lid may, for example, form an inner lid, which is rotated together with the contact arm.
In at least one embodiment, the intermediate part has, in addition to the aforementioned locking position, hereinafter called the first locking position, a second locking position, to which the intermediate part can move, after being pressed out of the first locking position and after further pivoting of the contact arm relative to the rotor housing.
The spring which presses the intermediate part into its first locking position in the recess is preferably arranged such that it can also hold the intermediate part in its second locking position in a resilient manner, for example by pressing it into a second recess or against a stop, the contact arm thereby being held in its pivoted position relative to the rotor housing.
In addition, the spring can interact with an impact body, which, in the event of a pivoting of the contact arm relative to the rotor housing and a resulting deformation of the spring, is brought into contact with the intermediate part and presses the intermediate part out of the first and/or the second locking position. An impact body may, for example, reduce the effect of friction on the rotational movement of the contact arm.
The contact arm of the switch is preferably pivoted if the current flowing via the contact arm exceeds a predefined value or the rotor housing is rotated.
The invention will be explained in detail below with the aid of example embodiments; by way of example:
In the figures, for the sake of clarity, the same reference characters are used consistently for identical or comparable components.
Various example embodiments will now be described more fully with reference to the accompanying drawings in which only some example embodiments are shown. Specific structural and functional details disclosed herein are merely representative for purposes of describing example embodiments. The present invention, however, may be embodied in many alternate forms and should not be construed as limited to only the example embodiments set forth herein.
Accordingly, while example embodiments of the invention are capable of various modifications and alternative forms, embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intent to limit example embodiments of the present invention to the particular forms disclosed. On the contrary, example embodiments are to cover all modifications, equivalents, and alternatives falling within the scope of the invention. Like numbers refer to like elements throughout the description of the figures.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention. As used herein, the term “and/or,” includes any and all combinations of one or more of the associated listed items.
It will be understood that when an element is referred to as being “connected,” or “coupled,” to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being “directly connected,” or “directly coupled,” to another element, there are no intervening elements present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between,” versus “directly between,” “adjacent,” versus “directly adjacent,” etc.).
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the invention. As used herein, the singular forms “a,” “an,” and “the,” are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the terms “and/or” and “at least one of” include any and all combinations of one or more of the associated listed items. It will be further understood that the terms “comprises,” “comprising,” “includes,” and/or “including,” when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may in fact be executed substantially concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
Spatially relative terms, such as “beneath”, “below”, “lower”, “above”, “upper”, and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, term such as “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein are interpreted accordingly.
Although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, it should be understood that these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are used only to distinguish one element, component, region, layer, or section from another region, layer, or section. Thus, a first element, component, region, layer, or section discussed below could be termed a second element, component, region, layer, or section without departing from the teachings of the present invention.
The contact bridge 30 is formed by a first contact arm 50 and a second contact arm 51. Each of the two contact arms 50 and 51 is furnished at the end of the contact arm with a contact element. The contact elements are labeled in
In the representation shown in
It can also be seen that the rotor housing 20 has a housing shell 21 with an edge section, the inner edge surface of which is labeled with the reference character 22. The inner edge surface 22 forms a wall section, on which two intermediate parts in the shape of spheres 100 and 101 can slide and/or roll.
In the switched-on state of the switch 10 shown in
The two spheres 100 and 101 form separate parts which are not mechanically connected either to the housing shell 21 or the rotor housing 20 or to the contact bridge 30. The spheres 100 and 101 are separate independent parts which are merely held between the housing shell 21 of the rotor housing 20 and the contact bridge 30 in a resiliently clamped manner by the two spheres 120 and 121.
To assemble the switch 10, the two spheres 100 and 101 have therefore merely to be inserted into the recesses 110 and 111 and clamped firmly there by way of the two springs 120 and 121.
As can additionally be seen from
In order to define the first locking position of the contact bridge 30 shown in
If the current that flows via the contact bridge 30 from the one contact bar 70 to the other contact bar 71 and vice versa becomes too great, magnetic forces act indirectly or directly on the contact bridge 30, as a result of which the contact bridge 30 will be pivoted in the direction of pivot P. This pivoting movement occurs relative to the rotor housing 20. In the event of such a pivoting movement occurring, the two springs 120 and 121, which are braced against the contact bridge 30, exert a compressive force onto the two spheres 100 and 101 and press these out of their recess 110 and 111 respectively. After being pressed out in this way, the two spheres 100 and 101 roll on the inner edge surface 22 of the housing shell 21 in the direction of the arrow P.
The second locking position ensures that the open switch state of the contact elements which is shown in
If the current flowing through the contact bridge 30 exceeds a threshold value, then—as explained previously—this will cause a pivoting of the contact bridge 30 relative to the rotor housing 20, as a result of which the two spheres 100 and 101 will each be pressed out of their recess 110 and 111, respectively. The two spheres 100 and 101 will roll on the inner edge surface 22 of the housing shell 21 and enter second recesses 200 and 201. In these second recesses 200 and 201, the two spheres 100 and 101 will each also be resiliently held by the four springs.
In other respects, the example embodiment according to
In other respects, the third example embodiment corresponds to the second example embodiment according to
Impact bodies like those shown in
Alternatively or additionally, impact bodies may also be provided on an inner lid 500 (cf.
The patent claims filed with the application are formulation proposals without prejudice for obtaining more extensive patent protection. The applicant reserves the right to claim even further combinations of features previously disclosed only in the description and/or drawings.
The example embodiment or each example embodiment should not be understood as a restriction of the invention. Rather, numerous variations and modifications are possible in the context of the present disclosure, in particular those variants and combinations which can be inferred by the person skilled in the art with regard to achieving the object for example by combination or modification of individual features or elements or method steps that are described in connection with the general or specific part of the description and are contained in the claims and/or the drawings, and, by way of combinable features, lead to a new subject matter or to new method steps or sequences of method steps, including insofar as they concern production, testing and operating methods.
References back that are used in dependent claims indicate the further embodiment of the subject matter of the main claim by way of the features of the respective dependent claim; they should not be understood as dispensing with obtaining independent protection of the subject matter for the combinations of features in the referred-back dependent claims. Furthermore, with regard to interpreting the claims, where a feature is concretized in more specific detail in a subordinate claim, it should be assumed that such a restriction is not present in the respective preceding claims.
Since the subject matter of the dependent claims in relation to the prior art on the priority date may form separate and independent inventions, the applicant reserves the right to make them the subject matter of independent claims or divisional declarations. They may furthermore also contain independent inventions which have a configuration that is independent of the subject matters of the preceding dependent claims.
Further, elements and/or features of different example embodiments may be combined with each other and/or substituted for each other within the scope of this disclosure and appended claims.
Example embodiments being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
P direction of arrow, pivoting direction
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2011 003 131.6 | Jan 2011 | DE | national |
