Movable or removable closures – Up-and-over type; e.g. – moves from vertical to withdrawn... – On lever or link
Patent
1996-11-14
1998-01-27
Dorner, Kenneth J.
Movable or removable closures
Up-and-over type; e.g., moves from vertical to withdrawn...
On lever or link
49205, E05D 1546
Patent
active
057111138
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a suspension mechanism for a door construction of the kind which includes a door panel that can be swung vertically up and down, wherein the door construction includes a stationary pivot means located in the region between the upper and lower parts of the door opening, a first brace means extending from the pivot means to the lower part of the door, a spring means which is tensioned when closing the door and which when opening the door exerts a torque-generating force that tends to pivot the first brace such as to raise the door panel, and further includes a second brace means whose one end is pivotally connected to the first brace by a second pivot means at a point between the stationary first pivot means and the point of connection of the first brace to the lower part of the door, wherein the other end of the second brace is intended to support against the upper part of the door panel.
An arrangement of this kind is known from FIG. 1 of SE-B-462 054 for instance.
It is preferred to use compression springs in arrangements of this kind. The lifting force of a compression spring will be limited only to a relatively small degree should the spring fracture. In contrast, the lifting function of a pull spring or tension spring is lost completely when such a spring fractures.
One problem with compression springs, and then particularly with compression springs that are located in the region of the lower half of the door, is that the turns of the spring are mutually compressed as the door is closed. This presents a danger to children playing in the vicinity of an exposed spring.
Consequently, it has been considered necessary to encase the compression spring in a protective sleeve and to extend a pull rod through the full length of the spring, wherein the sleeve also functions to transmit the forces that pass through the spring.
The object of the invention is to provide a simple door suspension mechanism of the kind defined in the introduction, partly with the aim of simplifying the actual linkage mechanism itself, and partly with the aim of also simplifying the spring arrangement while minimizing the risk of damage thereto.
The invention is defined in the following claim 1.
Embodiments of the inventive arrangement are defined in the claims appendant to claim 1.
In a construction of the kind described in the introduction, the invention is characterized in that the second brace means extends displaceably through a stationary axial guide means located above the first stationary pivot means.
This axial guide enables the second brace to move axially through the guide and also to pivot therein. This pivoting action of the second brace can be achieved, for instance, by mounting the guide for rotation on a horizontal axle which extends at right angles to the second brace. The actual axial guide can then consist in an opening in the rotatable part of the guide, said opening corresponding in shape to the cross-sectional shape of the second brace.
The stationary pivot means and the stationary axial guide may advantageously be located close to the plane of the door panel when the door is closed, wherein the links may extend parallel with and close to the plane of the door panel when the door is closed. The spring means may include a compression spring and the spring may surround the second brace between the axial guide and that end of the second brace which supports against the door. The second brace will therewith also function to stabilize the compression spring, so as to prevent the spring from buckling away from its operative direction.
According to one embodiment of the invention, that end of the second brace which supports against the door may have the form of a runner and the door may have fitted thereto an undercut profiled section which extends vertically along the door panel and which receives said brace end in a shape bound manner for movement of said brace end along the profiled section. As an alternative to the aforedescribed positioning of the compression spring it is conceivable
REFERENCES:
patent: 2244182 (1941-06-01), Allen
patent: 3849937 (1974-11-01), Blumenthal
patent: 3913266 (1975-10-01), Smith
patent: 5027554 (1991-07-01), Parker
patent: 5384975 (1995-01-01), Yuran
Cohen Curtis
Dorner Kenneth J.
JKG Snickerikonsult AB
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