Static structures (e.g. – buildings) – Framing to receive door – doorjamb – or window sash
Patent
1998-01-15
1999-05-18
Friedman, Carl D.
Static structures (e.g., buildings)
Framing to receive door, doorjamb, or window sash
5220451, 52208, 526561, E06B1/04
Patent
active
059040122
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
In a first aspect this invention relates to a wooden frame for window or door leaves, composed of frame pieces each one of which comprising a first part facing outwards in a wall opening and a second part facing inwards.
BACKGROUND OF THE INVENTION
Rot damage constitutes a great problem in connection with wooden windows of previously known type. Rot damage on wooden windows gives rise to considerable costs for house-owners. A basic reason for the problem is that the frames of the windows are made of wood pieces the characteristics and fibre-orientation of which are, in all essentials, uncontrolled. Thus, the window manufacturer buys board blanks the location of extraction of which in the original log may lie just anywhere. In some cases, the board may be extracted from the outer sap of the log and in other cases extracted from the central heartwood. The window manufacturer totally lacks control of the orientation of the annual rings. Sometimes the presence of heartwood in the individual frame piece may be orientated inwards in the frame and sometimes outwards. The turning of the wooden material is above all guided by the presence of possible knots, which are orientated towards the hidden side of the frame. Usually possible knots are drilled out and replaced by knotfree wooden plugs which are glued without any particular selection in comparison to the surrounding frame wood and external weather exposure respectively. In the traditional sawing of logs, the log is split or divided by means of a plurality of parallel sawing cuts, which, particularly in case of small dimension logs, entails that the annual rings of the wood will be mainly orientated lying in the surface which is turned outwards in the finished frame piece. By the fact that the bulking susceptibility of the wood is larger in the tangential direction (in practice about 7%) than in the radial direction (about 4%), paint or other surface treatment layers outside the individual frame piece are exposed to large, alternating shrinkage and elongation stresses which lead to crack formations in the protecting paint layer as well as in the proper surface wood. The rot problem is particularly marked in the bottom piece of the frame and the lower parts of the side pieces of the frame, which in practice relatively fast (from 8 to 15 years) tend to putrefy up to a height of about 20 cm as a consequence of water penetration in cracks and capillary suction of water from the lower ends of the side pieces, which ends are connected to the bottom piece of the frame. Another disadvantage of traditional frames is that all of the frame pieces mainly are of a rectangular cross section shape. This cross section shape means that the viewing or panoramic angle for an observer being indoors is limited by the outer edges of the frame pieces facing the centre of the frame rather than the inner edges which are closer to the observer. Therefore, for a given frame size, the panoramic angle will be relatively small.
OBJECTS AND FEATURES OF THE INVENTION
The present invention aims at obviating the above-mentioned problems and disadvantages and at creating an improved wooden frame for, in particular, inwardly opening window frames or door frames. Thus, a primary object of the invention is to create a wooden frame having a considerably increased capability to, on one hand, stand up to tendencies to crack formations in the surface wood of the frame wood as well as in protecting paint or surface treatment layer lying outside, and, on the other hand, countercheck water absorption and rotting phenomena connected thereto. Another object of the invention is to create a wooden frame the tendency of which to retain moisture in the joints between individual frame pieces is reduced to a minimum. A further object of the invention is to create a wooden frame which for any given frame size offers an increased viewing or panoramic angle. In other words, the frame should allow an increased light admission through appurtenant window leaves.
In a first aspect
REFERENCES:
patent: 2727284 (1955-12-01), Adams et al.
patent: 3031726 (1962-05-01), Migneault et al.
patent: 4991369 (1991-02-01), Lamb
Dorsey Dennis L.
Friedman Carl D.
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