July i5, i952 J. WIELAND 2,662,969
TILTABLE DooR STRUCTURE FiledApril 18, 195o [jig- 5' I 1N VEN TOR:
Patented July 15, 1952 TILTABLE DOOR STRUCTURE JacobWieland, Gorinchem, Netherlands, assigner i to De Vries Robb & Co. N. V.
' Application April 18, 1950, Serial No. 156,543
VVI nkthe Netherlands March 28, 1949 The invention relates to a tiltable door structure of thetype wherein a door is suspended on one or more hinged arms, so that when opening or closing the door the lower side thereof moves in the plane, in which the door opening is arranged or in a plane parallel thereto, and the lower side of the door being guided.
The invention is applicable `not only for doors vbut also for suspended windows or panels.
i With door and window construction of said type a hinged arm is at oneendconnectedjwith the wall, in which there, is arranged the opening to be closed by the said door or window.
The problem underlying the invention, as well as lthe solutions and applicationjresulting'from same; are illustrated. in the accompanying drawing and more.preciselydescrbed underneath.
Fig. 1 is a schematic view, partly in section that shows an almost completely opened door with the wall, to which the door is iixed, with triangle of forces belonging to it.
Fig. 2 is a schematic view, partly in section, similar to Fig. l, but shows a corresponding schematic performance with the door in an almost closed position, also with a triangle of forces belonging to it.
Fig. 3 and Fig. 4 are schematic views that show the ratio between the lengths of the hinged arm and the distance of the guide of the lower side of the door up to the fastening point of the hinged arm.
Fig. 5 is a schematic elevational view that shows a way of attachment of the spring to the door and the fixed wall.
The door I has at the lower side guiding rollers 2, which when opening and closing the door roll along the guides 3 in the plane of the wall 4. The door l is fixed by means of the hinged arm 5. Said hinged arm is xed to the wall at 6 and to the door at l. The length of the hinged arm between the two pivoting points is indicated at C, whereas the distance between the roller shaft and the pivoting point 'l is indicated at D. According to the invention C is larger than D.
From the triangles of forces belonging to Figs. 1-4, it can be observed that in the highest position of the lower side of the door the vertical component of the compressive force working in the door plane is as small as possible and, conversely, that force is as large as possible when said lower side is situated as far as possible from the point 6. If the legs 6, 'l and 2, 'l of the trangle 6, l, 2 were equal, the vertical projections of the stressing force and the Vertical projection of the compressive force would be equal.
2 claims. (c1. .2cK-i6),`
By the construction accordingto the invention the vertical projection of I,the` compressive force becomes larger as the doorapproachesthe closed position (seeFg. 2 triangle of' forces) 1 On the lowerjside of the doorthere' always applies a force G and the vertical-component of the compressive force If the door is brought from `the closedinto the open position, inthe beginning, the largest force must. be exerted upwardsin vertical direction on the lower s ide 'of the door. i
If, for instance. a tension spring is fixed at one end to Vthe lower side o f the door (such as one of the springs schematically indicated at 8 and l I of Fig. 5), and the other spring end is attached to a xed point in such a way that for closing the door the spring is stretched, the spring will be stretched more when the door is closed as the distance between the points 6 and 2 becomes larger. Therefore when the door is opened, that spring has in the beginning the largest influence, which decreases when the vertical component of the compressive force becomes smaller.
According to an embodiment of the invention, there is provided a so-called pre-stretched tension spring. Such a spring is especially suited for acting in very different positions of the door. The tension of the spring is largest in the completely closed position of the door and is decreased when the door is opened.
With the help of the triangular diagrams of Figs. 3 and 4 the length of the hinged ar-m in proportion to the distance of the fastening point of the hinged arm up to the guide at the lower side of the door can be calculated.
In Fig. 3 the door hangs horizontally in the extremely opened position.
a=the distance of the guide of the lower side of the door in completely closed position up to the fastening point of the hinged arm c b=this distance, when the door is completely from which follows that c=a-d.
3 When the angle of inclination of the door is cos A Whereas in the schematical drawing only one hinged arm is indicated, in practice a hinged arm will generally be arranged at both sides of the door.
As appears from Fig. 5 the springs, especially the pre-stretched springs, can lie in the same or nearly the same plane as the door opening. In this case tension springs 8 and Il are attached at the lower side of the `door at both sides of the door, whereas the other ends of said springs are attached to the wall of the door opening at points 9 and I0 diagonally. opposite to the fastening points 2 oi' the springs to the door.
In the embodiment as illustrated two prestretched springs 8 and H are xed in the described Way, so that the spring 8 is fixed to the point 2 of the door and the point 9 of the wall, whereas the draw spring Ii is xed at the other side of the door and to the point l of the wall.
1. In an overhead door structure including an apertured frame having a straight guide, a door movable relative to said frame between an aperture closing position and an opening position at right angle to the former and having an end sin 4 edge engaging said guide describing a substantially linear path. pvot means mounted directly on said door within the connes thereof spaced from said end edge for a predetermined distance, and unitary rigid link means pivoted to said pivot means and to said frame, said link means having a length greater'than said predetermined distance, said predetermined distance being the sum of the length of said link means and the distance between said edge in closed position and the pivot point of said frame.
2. Inv an overhead structure, as lclaimed in claim 1. in combination with, tension spring means secured to said frame and connected to said one end edge and being operable, in con- JACOB WIELAND.
REFERENCES CITED The following references are of record in the le of this patent:
UNITED STATES PATENTS Number Name Date 693,952 Cross Feb. 25, 1902 875,306 Wilson Dec. 31, 1907 1,757,955 Dautrick May 13, 1930 2,173,684 Graham et al Sept. 19, 1939 2,353,263 Pierce July 11, 1944 FOREIGN PATENTS Number Country Date 41,442 Netherlands Aug. 16, 1937 55,413 Netherlands Oct. 15, 1943 115,569 Australia July 17, 1942