Locks – Operating mechanism – Using a powered device
Patent
1998-04-09
1999-10-26
Barrett, Suzanne Dino
Locks
Operating mechanism
Using a powered device
70256, 70224, 70472, 70149, E05B 4700
Patent
active
059707593
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a changeover device for a door or window fitting and to a door, gate or window fitting having such a changeover device.
2. Description of the Prior Art
Door or window fittings with means for changing over between various operating states are known.
For example, turn and tilt fittings for windows are in widespread use, making it possible to open the window both about a vertical and about a horizontal axis of rotation or else keeping the window locked.
DE-B-11 13 649 discloses a door fitting, in which the door handle can be uncoupled from the associated lever spindle by means of a coupling. This fitting makes it possible, in one position of a coupling, to rotate the lever spindle and consequently open (or close) the door, whilst, in a second position, the door handle can be rotated freely, without the lever spindle rotating and without the door being able to be opened (or closed).
DE 78 20 998 U discloses a window fitting for swinging casement windows, in which a handle, rotatable in an escutcheon or a rose and having a boltlike integrally formed portion for engagement into a striking plate, is assigned a pushbutton-actuated blocking part, by means of which the handle can be prevented from being actuated.
In these and other known fittings, a changeover between the operating states takes place on that side of the fitting (that is to say of the door or window) on which the changeover also takes effect.
There are also known possibilities for selectively allowing or preventing the opening of a door from one side (outside) or from the other side (inside).
Not only conventional locks for locking a door by means of a key actuated lock bolt are generally known here, but also the locking devices of bathroom or WC doors, in which a detent bolt provided in addition to the spring-actuated snap bolt (of the latch) is pushed behind an associated striking plate via an internally arranged rotary grip (handle, knob), after which actuation of the external lever causes the snap bolt to be drawn back, but does not cause the door to open.
When a door is barred by means of a key, any passage through the door whenever the latter is to be kept barred involves a double actuation of the lock. This is too complicated in many instances occurring in practice, for example for authorities where there is usually public access, but in which admittance has to be controlled, or for stores, after they have closed, when there are still customers in the store and it must be possible for them to leave it. The more employees work in a room or section of a building, the more difficult this solution becomes in terms of organization and cost. Furthermore, "self-confinement" must be regarded as unfavorable from the point of view of protection of labor (the presence of nonbarred escape routes) and from considerations of work psychology.
Moreover, door openers have been known for a long time, particularly from the entrance areas of companies, authorities, etc., the functioning of these door openers being based on an electromechanically remote-controlled drawback of the abutment for the snap bolt in the door frame. The greatest disadvantage of this solution is that its execution, particularly in the form of retrofitting, necessitates a high outlay for electrical installation and, particularly in the case of safety doors, the modification of the frame.
German Utility Model 1,683,917 discloses a door handle which can be locked on one side and in which the external lever handle is inactivated as a result of the axial displacement of a projecting lever on the internal lever handle and the external lever handle is fixed in the inactive state. It is no longer possible for the door to operate idly in this operating state. However, since the user recognizes that the external lever handle is a handle for moving the door, this principle entails the risk of accidents on two counts, on the one hand because the absence of movability of the external lever handle in the inactive state is co
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Derwent Abstract corresponding to 38 44 281.
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