Movable or removable closures – Mounted for multidirectional or oblique movement – Swings on plural axes; e.g. – pivotal link arms
Patent
1996-05-31
1997-11-25
Dorner, Kenneth J.
Movable or removable closures
Mounted for multidirectional or oblique movement
Swings on plural axes; e.g., pivotal link arms
267175, 267177, 49253, E05D 1530
Patent
active
056899165
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a window, particularly for installation in an inclined roof surface, comprising a main frame and a frame hinged to the top thereof as well as a frame lifting arm inserted between the main frame and the frame, said arm having one end pivotally connected with a lateral member of the main frame or the frame and its other end pivotally connected with a slide shoe which in a longitudinally displaceable manner is connected with the corresponding lateral member of the frame or the main frame, respectively, and which is associated with a pre-stressed lifting spring, as a first coupling member on the slide shoe is adapted to be brought into engagement; with a second coupling member connected with the lifting spring when installing the window at the installation site.
Such a window is known e.g. from WO-A-89/10460. Herein is described how it is possible, by moving the point of action of the lifting spring, to alter the pre-stressing of the spring in dependence on the roof inclination. However, the pre-stressing interval is insufficient due to the constructive elaboration and the application is thus limited to roof inclinations within a relatively small angular range.
The object of the present invention is to provide a window in which the window frame can easily be opened and at the same time be kept in a stable position of rest in the whole range of the opening angle for roof inclinations within a large angular range.
For obtaining this, the Window is, according to the invention, characterized in chat an auxiliary spring is located between the slide shoe and the lifting spring, the pre-stressing of which can be adjusted in dependence on the roof inclination, by means of a manually operated adjusting element, to exert a parallel spring force for supplementing the spring force from the lifting spring within a given range of the opening angle of the window.
It is thereby possible to obtain a spring bias which makes the force to be added by the user of the window manageable when opening and closing the window frame, while at the same time the spring moment is adjusted in such a way that the window can be parked in a stable position of rest at an arbitrary opening angle of the window.
By pre-stressing the auxiliary spring, the window according to the invention can be applied in a roof with different roof inclinations within an angular range covering even very small angles, as e.g. 20.degree.. In the case of large roof inclinations, the pre-stressing of the auxiliary spring is not required, as the lifting spring alone provides the required bias force.
The auxiliary spring is preferably installed as a compression spring and is accommodated in a spring box placed on the tie rod between the lifting spring and a guide rail for the slide shoe between an abutment which is stationary with respect to the tie rod and an abutment which is movable along the spring box.
Hereby the auxiliary spring can easily be manually pre-stressed by moving the movable abutment to a position where the auxiliary spring will be compressed and thereby pre-stressed.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, the invention will be explained in detail with reference to the accompanying drawings, in which
FIG. 1 illustrates a known window in a schematic side elevation, partially in section, the window being in its open position and the glass-carrying frame released from the intermediate frame,
FIG. 2 is a schematic side elevation, partially in section, of one of the top corners of the window, and
FIGS. 3-5 moment graphs on the moments of the frame weight and the spring force about a hinge axis through the hinges.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The window main frame 1 illustrated in FIG. 1 is, by means of hinges 2, connected in the top with an intermediate frame 3, which constitutes a support to a glass-carrying pivotal frame 4. The pivotal frame 4 is normally connected with the intermediate frame 3 by means of an upper closing means, not shown, the hinges 2 thus being
REFERENCES:
patent: 3561162 (1971-02-01), Goldman
patent: 3714680 (1973-02-01), Little
patent: 3737947 (1973-06-01), Little
patent: 3851909 (1974-12-01), Hester et al.
patent: 4217732 (1980-08-01), Reichstadt
patent: 4294039 (1981-10-01), Dalheimer et al.
patent: 4706333 (1987-11-01), Lauderbach
patent: 4991675 (1991-02-01), Tosconi et al.
Jensen Jan Fahlen
Kornerup Klaus
Cohen Curtis
Dorner Kenneth J.
V, Kann Rasmussen Industri A/S
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