GB2289915A

GB2289915A - Securing device

Info

Publication number: GB2289915A
Application number: GB9510885A
Authority: GB
Inventors: Helmut Fuss Fritz
Original assignee: Fritz Fuss GmbH and Co
Current assignee: Fritz Fuss GmbH and Co
Priority date: 1994-05-30
Filing date: 1995-05-30
Publication date: 1995-12-06
Anticipated expiration: 2015-05-30
Also published as: NO952115L; DE4418863C1; SE9501582D0; NO952115D0; GB2289915B; NO319453B1; SE9501582L; GB9510885D0; SE505945C2

Abstract

The security device has an electromagnetically-operated pivoted security latch with a stop nose (22) which blocks the operation of the door opener pivot lever (15). This stop nose lies parallel to the pivot axis (19) of the pivot lever, with an opposing stop nose provided by the latter, both noses interlocking in the blocking position of the security device. A second security latch (23) also cooperates with the pivot lever and is deflected against a spring force in opposition to the first security latch, upon movement of the latter into the released position.

Description

2289915 SECURING DEVICE FOR A LOCKING LEVER OF A DOOR OPENER is The

invention relates to a securing device for a locking lever (or changer) of a door opener having an electromagnetically operable, pivotably mounted securing lever for the locking lever, the securing lever having a stop, which releases or locks the locking lever as a function of the securing lever position.

Such electric door openers are generally known and a distinction can be made between an open and a closed circuit construction. Fundamentally the function of the door opener is based on the fact that the locking lever is held by the securing lever in the pivoting path of the door opener latch until the securing lever releases the locking lever by an operation of the electromagnet.

It is known from EP-Bl-0.279,878 to protect the locked position of the locking lever and the securing lever against impact effects, which could lead to a brief opening of the securing device. For this purpose a locking lever is provided, which engages behind the securing lever when in its locked position and fixes it in said position. This locking lever is controlled by an additional, upstream armature on the electromagnet.

The present invention provides a further securing device of the aforementioned type.

According to the present invention there is provided a securing device for a pivotable locking lever of an electromagnetically operated door opener, said device comprising:a first securing lever provided on an armature of an electromagnet and having a stop constructed as a nose, the axis of the nose being parallel to a pivot axis of the locking lever, the locking lever being provided with an oppositely directed nose, having its axis parallel to the axis of the nose on the first securing lever, and wherein the two noses are positioned such that, in the locked state, they engage one another preventing the locking lever releasing the securing device, and in the released state they are offset from one another allowing the locking lever to move to release the securing device, because the first securing lever has been deflected from an inoperative position on a pivot pin; and a second securing lever provided with a stop, which is pivotably located on the first securing lever and resiliently biased against the locking lever, wherein the second securing lever co-operates with the locking lever by means of a control edge, such that a deflection of the first securing lever into an open position causes the second securing lever to be deflected away from the locking lever against the applied bias, the first and second securing levers moving apart in a scissorlike manner.

The invention has the advantage that as a result of the scissor-like spreading of the two securing levers, there is a gap of precisely definable width between the stops, which only permits the passage of the nose located on the locking lever if the first securing lever is completely in its-release position. In all intermediate positions the nose on the locking is either secured by the nose on the first securing 1 lever or by the stop on the second securing lever.

A specific embodiment of the present invention will now be described by way of example and with reference to the accompanying drawings in which:Fig.1 shows diagrammatically a cross-section through an open-circuit door opener with a dead electromagnet in a locked position; Fig.2 shows diagrammatically a partial cross-section through door opener according to Fig. 1 with a live electromagnet in a release position; Fig.3 shows diagrammatically a view along line III-III in Fig.2; and FigsA&S shows part cross-sectional representions of the door opener according to Figs. 1 and 2 in the dead state under an impact effect.

The drawings show a door opener housing 9 which contains the components described herein. A pivoting or swivel latch is deflectably mounted in a known manner about a pivot pin 11 with its axis lying in the drawing plane. From the locked position shown in the drawing it can be brought into the release position by pivoting out of the drawing plane. It is subject to the action of a locking lever 15, whose pivot pin or axis 16 is at right angles to the drawing plane. The locking lever is is biased by a spring 17 against the pivot latch 10.

The locking level 15 is locked or released by a securing device comprising an electromagnet 12 and a two-arm armature 18, one arm of the armature 18 serving as a first securing lever 13 and being in engagement with the locking lever 15. A pivot pin or axis 19 of the armature 18 runs in axially parallel manner to the pivot pin or axis 16 of the locking lever 15. The armature is rototably mounted about the pivot pin 19 having two springs 20, 21 acting against one another.

According to Fig. 1 the locking lever side of the armature arm 18 is on the one hand constructed as a securing lever 13 with a nose 22 serving as a stop and on the other carries a second securing lever 23 with a stop 24. The second securing lever 23 is pivotably mounted by means of a bolt 8 parallel to the pivot pin 19, the bolt 8 being at a predetermined distance from the pivot pin 19 and therefore has a predetermined lever arm on the first securing lever 13. The second securing lever 23 is pretensioned against the locking lever 15 by a spring 25, which is supported on the armature 18, said second securing lever 23 being supported on a upper edge 26 of the locking lever.

In the represented locked position with the magnet 12 dead, the nose 22 of the first securing lever 13 and the stop 24 of the second securing lever 23 are in the pivoting path upstream of the locking lever 15 and in that way prevent a deflection of the latter.

In Figs. 2 and 3, the electromagnet 12 is live and the armature 18 is completely attracted in the a clockwise direction. The first securing lever 13 is also moved downwards in a clockwise direction, the pivot pin 19 of the second securing lever 23 having correspondingly changed its position. Since, due its engagement with the upper edge 26 of the locking ?I lever, the second securing lever 23 cannot follow this movement, it is pivoted counter-clockwise such that the stop 24 releases the locking lever 15.

As is illustrated in Fig. 3, the nose 22 is directed towards the first securing lever 13 in an axially parallel manner to the pivot pin 16 (Fig. 1) and counter to the direction of the further nose 27 on the locking lever 15. In the position shown, with the magnet 12 live. the two noses 22, 27 pass behind one another, so that the locking lever 15 can be moved out of the drawing plane. The stop 24 on the second securing lever 23 is, according to Fig. 2, displaced adequately far outwards over the upper edge 26 of the locking lever, so as not to engage the locking lever 15.

Thus, the second securing lever 23 is spread in scissorlike manner relative to the first securing lever, providing a predetermined inside width between the stop 24 on the second securing lever 23 and the nose 22 on the first securing lever and which is dimensioned in such a way that the further nose 27 on the locking lever 15 can pass unimpeded. The nose 22 on the first securing lever and the further nose 27 on the locking lever engage behind one another.

Fig. 4 shows a situation in which a mechanical impact has been exerted on the housing 9. The magnet 12 is dead, so that the locking lever 15 must be held in the locked position. As a result of the impact effect, the armature 18 is deflected somewhat out of the normal position, which leads to a partial opening of the two securing levers 13, 23. As the open position of the armature 18 has not been completely reached. although the stop 24 of the second securing lever 23 releases the locking lever 15, the further nose 27 on the locking lever 15 cannot engage behind and past the nose 22 on the first securing lever 13, so that the locking lever 15 is secured and remains in the locked position. It is clear that the energy transmitted to the housing 9 by the impact causes an equidirectional deflection of the two securing levers 13, 23. However, as the two securing levers 13, 23 of the locking/release mechanism are designed to operate in opposing directions, it is ensured that at least one of the two securing means maintains the locking function.

Fig. 5 shows a further example, in which not only is an impact effect exerted on the housing 9, but also a considerable pressure on the pivoting latch 10. The armature 18 is totally deflected in a counterclockwise direction. In such a situation the locking lever 15 is held both by the nose 22 on the first securing lever 13 and by the stop 24 on the second securing lever 23, because the latter is prevented from unlocking as a result of the surface pressure (static friction) which takes place on the stop 24 between the second securing lever 23 and the locking lever 15. In this case, where considerable pressure is acting on the pivoting latch 10 there is double security against impacting.

Claims

1. A securing device for a pivotable locking lever of an electromagnetically operated door opener, said device comprising: a first securing lever provided on an armature of an electromagnet and having a stop constructed as a nose, the axis of the nose being parallel to a pivot axis of the locking lever, the locking lever being provided with an oppositely directed nose, having its axis parallel to the axis of the nose on the first securing lever, and wherein the two noses are positioned such that, in the locked state, they engage one another preventing the locking lever releasing the securing device, and in the released state they are offset from one another allowing the locking lever to move to release the securing device, because the first securing lever has been deflected from an inoperative position on a pivot pin; and a second securing lever provided with a stop, which is pivotably located on the first securing lever and resiliently biased against the locking lever, wherein the second securing lever co-operates with the locking lever by means of a control edge, such that a deflection of the first securing lever into an open position causes the second securing lever to be deflected away from the locking lever against the applied bias, the first and second securing levers moving apart in a scissorlike manner.

2. A securing device according to claim wherein the biasing of the second securing lever is provided by a spring which is supported by the first securing lever.

3. A securing device according to claim 1 or 2, wherein the second securing lever is mounted in a fork on the first securing lever.

4. A securing device substantially as described herein with reference to Figs. 1 to 5 of the accompanying drawings.