Patent Application
20150162671
The invention relates to an electrical connection terminal comprising a housing having a conductor insertion opening, a busbar arranged in the housing, a spring element which is rotatably mounted in the housing and is pivotable into an open position and into a closed position, it being possible, in the closed position, to clamp a conductor inserted into the conductor insertion opening against the busbar by means of the spring element, and having an actuating element which is rotatably mounted in the housing, has an actuating arm and by means of which the spring element can be actuated so as to be transferred into the open position and into the closed position.
An electrical connection terminal of this type is known, for example, from DE 10 2008 039 868 A1, in which a spring element formed as a leg spring can be pivoted, by means of an actuating element, into an open position and a closed position in order to clamp a conductor inserted into the housing. To open the spring element and to thus facilitate the pivoting of the spring element out of the closed position into the open position, the actuating element comprises an actuating wall and two unlocking portions formed laterally next to the actuating wall. When the spring element is pivoted out of the closed position into the open position, the actuating wall can enter a slot formed in the spring element. To pivot the spring element completely from the closed position into the open position, the actuating element has to be moved upwards and thus itself pivoted or rotated. In this case, the actuating wall of the actuating element slides through the slot in the spring element until the end of the actuating wall hits, from the inside, a leg of the spring element, so that when the actuating element is pivoted further, the spring element is also pivoted into the open position.
A drawback here is that, owing to the pivot movement or rotational movement of the actuating element when the spring element is transferred from the closed position into the open position, the user is at great risk of injury since, in particular with high spring forces, a large force acts on the actuating element and thus the actuating element is rotated at high speed in an uncontrolled manner. If the actuating element is actuated by a tool, the risk of injury to the user is additionally increased in the process, since the tool pivots therewith in a fast and uncontrolled manner.
The problem addressed by the invention is therefore to provide an electrical connection terminal in which the risk of injury to the user when transferring the spring element from a closed position into an open position can be significantly reduced.
In an electrical connection terminal of the type mentioned at the outset, this problem is solved according to the invention in that the actuating element comprises a clearance which is adapted to the spring element and into which the spring element can pivot during a pivot movement from the closed position into the open position, without triggering a rotational movement of the actuating element.
Expedient embodiments and advantageous developments of the invention are given in the dependent claims.
The invention is thus characterised in that the actuating element does not move, in particular does not pivot, during an opening movement of the spring element, i.e. when the spring element is transferred from the closed position into the open position by a pivot movement of the spring element. The actuating element thus substantially remains in position during an opening movement of the spring element. In this case, the open position of the spring element is the completely open position of the spring element, in which the spring element is in its final position. This ensures that when the spring element is transferred from the closed position into the open position, the movement of the spring element is uncoupled from the movement of the actuating element, thereby preventing an uncontrolled movement of the actuating element that is normally initiated by the movement of the spring element, and it thus being possible to reduce to a minimum the risk of injury to the user as a result of an unexpected rotational movement of the actuating element. To achieve this, the actuating element, which is arranged in the housing preferably above the spring element, comprises a clearance (which can also be termed a recess or cut out) which is adapted to the spring element and is formed to be so large as to allow the spring element to be pivoted so far inside the clearance that said spring element is in a final position when in the completely open position, without triggering a movement of the actuating element in the process. The spring element is preferably formed as a leg spring comprising a clamping leg and an actuating leg, the actuating leg having, at its end remote from the clamping leg, a holding portion which is bent towards the clamping leg and by means of which the spring element, when in the closed position, locks on a holding element formed on the busbar or the housing. When the spring element is pivoted from the closed position into the open position, in particular the holding portion and also part of the actuating leg of the spring element enter the clearance in the actuating element. When the spring element is opened, the holding portion of the spring element is first released from its lock by means of the actuating arm of the actuating element, although there is still no pivot movement of the spring element in this case. Once the holding portion of the spring element has been released from the lock by the actuating element, despite the pivot movement of the spring element, the actuating element is not moved further, in particular is not rotated, until the spring element is in its completely open position. In particular if a large clamping force is exerted when clamping a connector having a large connector cross section, it is advantageous for the forces to now no longer be transmitted to the actuating element and thus to the tool, which is arranged in the actuating element, when the conductor is released and thus when the spring element is transferred from the closed position into the open position by the pivot movement of the spring element, but rather, in accordance with the solution according to the invention, the holding portion of the spring element is merely released from its lock by means of the actuating element or the actuating arm of the actuating element and then the spring element can “jump”, i.e. can be pivoted, into the untensioned, open position, in that said spring element enters the clearance in the actuating element without the actuating element itself being moved. Unlike the known connection terminals, in this case there is no coupling of the movement between the actuating element and the spring element during a pivot movement of the spring element for opening the spring element. This produces improved operating comfort for the user when using the electrical connection terminal, since high restoring forces of the spring element now no longer act on the actuating element and thus not on the tool for actuating the actuating element either, whereby the risk of injury to the user can be reduced. In addition, by forming a clearance in the actuating element, there is no need for an additional component to achieve the uncoupling between the actuating element and the spring element.
According to a preferred configuration of the invention, the spring element comprises at least one restoring spring portion, by means of which the spring element can be automatically transferred from the closed position into the open position. As soon as the holding portion of the spring element is released from the lock in the closed position, the restoring spring portion causes the spring element to pivot into the open position without additional aid or means. For this purpose, the restoring spring portion is tensioned when the spring element is in the closed position, in that the restoring spring portion is pushed against an element, preferably a plate which, for example, is a part of the busbar. When the spring element is transferred into the closed position and into the open position, the restoring spring portion is moved, in particular displaced, on the plate. A guide element which engages in and guides the restoring spring portion on the plate can be formed on the housing. Owing to the restoring spring portion, is it also possible to transfer the spring element from the closed position into the open position without there being a conductor connected or clamped. The restoring spring portion is preferably in the form of a spring arm which extends between the actuating leg and the clamping leg and is preferably attached to the actuating leg. The spring element can comprise one restoring spring portion or two or more restoring spring portions which are preferably arranged in parallel at a certain distance from one another.
Another preferred configuration of the invention provides that the spring element is formed as a spring assembly comprising two or more springs, the springs each projecting into the conductor insertion opening by different amounts. The springs of the spring assembly directly abut one another, so that, by using a spring assembly consisting of two or more springs, the spring force or contact force applied to the conductor to be clamped can be increased, whereby a sufficiently high contact force can be applied for secure clamping, even for large conductor cross sections. To additionally allow conductors having a small conductor cross section to be directly plugged, the springs of the spring assembly each project into the conductor insertion opening by different amounts, in that the length of the clamping legs of the individual springs of the spring assembly is different. In the case of two or more springs, the springs preferably project into the conductor insertion opening with a stepped length. Conductors having a small conductor cross section are then, for example, only pressed against the busbar by one spring or a clamping leg of one spring of the spring assembly, thereby allowing the conductors to be directly plugged. In the case of conductors having a large conductor cross section, however, said conductors are pressed against the busbar by a plurality or all of the springs and thus by a plurality or all of the clamping legs of the spring assembly. The electrical connection terminal is thus suitable for conductors having different conductor cross sections. However, if the electrical connection terminal is only used for conductors having one particular conductor cross section, it is also possible for the springs of the spring assembly to each project into the conductor insertion opening by the same amount so that a particularly high contact force can be applied to the conductor to be clamped.
To prevent the actuating element from being freely movable when a conductor is clamped against the busbar by means of the spring element, in particular when the spring element is in the closed position, it is preferably provided that the actuating element comprises a locking means for holding the actuating element in a fixed position. The locking means can, for example, take the form of a pin or web which is formed on the actuating element, protrudes laterally from the actuating element, and can, for example, hook behind a holding element, for example in the form of a web or a rib, formed on the inside of the housing.
In order to be able to transfer large forces, it is also preferably provided for the actuating element to comprise a tool insertion opening for actuating the actuating element by means of a tool. The rotational movement of the actuating element can thus be brought about by means of a tool, for example a screwdriver.
The actuating element is preferably formed such that said element comprises a main body, on which the actuating arm is formed, the main body having a greater thickness than the actuating arm. Owing to the greater thickness of the main body, said body can have a particularly high degree of stability, so that large forces can be absorbed via the main body of the actuating element. A through-opening is preferably formed in the main body, by means of which opening the actuating element is rotatably mounted on a bearing journal of the housing.
In addition, it is preferably provided for the housing to comprise two conductor insertion openings and for two spring elements and two actuating elements to be arranged in the housing, the two actuating elements being rotatable in the opposite direction to one another and opposing one another such that the actuating arms of the actuating elements are arranged behind one another in the separation direction. Owing to this specific arrangement with a plurality of actuating elements in a housing of a connection terminal, the necessary construction space can be divided up in as compact a manner as possible when two conductor connections are provided, whereby the electrical connection terminal as a whole can be formed to be particularly compact.
The invention will be described in more detail below with reference to a preferred embodiment and on the basis of the accompanying drawings, in which:
In addition, a first spring element 4a and a second spring element 4b are arranged in the housing 1, the first spring element 4a being arranged opposite the second spring element 4b. The two spring elements 4a, 4b are each rotatably mounted on a bearing journal 5a, 5b, so that the spring elements 4a, 4b can be separately transferred into a closed position and into an open position. In
Here, the spring elements 4a, 4b are each formed as a spring assembly comprising a first spring 6a, 6b and a second spring 7a, 7b. In this case, the second spring 7a, 7b abuts the inner surface of the first spring 6a, 6b. Both springs 6a, 6b, 7a, 7b are formed as leg springs which comprise a clamping leg 8a, 8b, 9a, 9b and an actuating leg 10a, 10b, 11a, 1 lb. By means of the clamping leg 8a, 8b, 9a, 9b, a conductor 23a, 23b inserted into the conductor insertion opening 2a, 2b can be clamped against the busbar 3. In this case, the clamping leg 9a, 9b of the second, inner spring 7a, 7b is longer than the clamping leg 8a, 8b of the first, outer spring 6a, 6b, so that, when clamping conductors 23a, 23b having a small conductor cross section, these are only clamped against the busbar 3 by means of the clamping leg 9a, 9b of the second spring 7a, 7b, and when clamping conductors 23a, 23b having a large conductor cross section, these are clamped against the busbar 3 by means of the clamping leg 8a, 8b of the first spring 6a, 6b and the clamping leg 9a, 9b of the second spring 7a, 7b.
A holding portion 12a, 12b, which is bent towards the clamping leg 8a, 8b, is formed on the actuating leg 10a, 10b, at the end thereof remote from the clamping leg 8a, 8b, of the first spring 6a, 6b, which actuating leg is longer than the actuating leg 11a, 1 lb of the second spring 7a, 7b, by means of which holding portion the first spring 6a, 6b and thus the spring element 4a, 4b formed as a spring assembly can, when in the closed position, lock on a holding element (not shown here) formed on the busbar 3 or on the housing 1.
When the spring elements 4a, 4b are in the closed position, as shown in
To actuate the spring elements 4a, 4b and thus the spring assemblies, two actuating elements 15a, 15b formed as eccentrics are additionally arranged in the housing 1. The actuating elements 15a, 15b are mounted so to be rotatable in the housing 1 by means of bearing journals 16a, 16b. As can be seen in particular in
To transfer the spring element 4a, 4b from the open position back into the closed position, the actuating element 15a, 15b is rotated such that it is pressed, preferably with the main body 17a, 17b thereof, against the actuating leg 10a, 10b, 11a, 11b of the spring element 4a, 4b so as to push said actuating leg downwards.
The actuating element 15a, 15b can be moved in a rotational manner by means of a tool, in particular a screwdriver, in that said tool is inserted into a tool insertion opening 20a, 20b formed in the actuating element 15a, 15b, the tool insertion opening 20a, 20b being formed in the main body 17a, 17b of the actuating element 15a, 15b.
To hold the actuating elements 15a, 15b in a fixed position, in particular when the spring elements 4a, 4b are in the closed position, the actuating elements 15a, 15b comprise a locking means 21a, as shown in
In the embodiment shown in
In
In
In this context, the design of the connection terminal is not limited to the embodiment shown here having two conductor insertion openings 2a, 2b, two spring elements 4a, 4b and two actuating elements 15a, 15b. It is also possible for the connection terminal to be formed having either one or more than two conductor insertion openings 2a, 2b, spring elements 4a, 4b and actuating elements 15a, 15b.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2012 011 794.9 | Jun 2012 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2013/001662 | 6/6/2013 | WO | 00 |
