Movable or removable closures – Mounted for multidirectional or oblique movement – Initial or terminal movement transverse to sliding movement...
Patent
1994-09-08
1997-04-15
Kannan, Philip C.
Movable or removable closures
Mounted for multidirectional or oblique movement
Initial or terminal movement transverse to sliding movement...
E05D 1510
Patent
active
056198221
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a sash window unit, at least comprising a frame with a sash window which is slidable vertically therein by means of two guideways comprising a single track, which can interact with one or more guide parts, sealing means between the sash window and the frame, closing means for moving the sash window relative to the frame at substantially right angles to the plane of the sash window over a relatively small distance for at least near a closed position of the sash window, placing said sash window in sealing contact with the frame, with the interposition of the sealing means, and on release to make the sash window slidable without appreciable friction and means for holding the sash window balanced in an open position
Such a sash window unit is known from EP-A-0 438 778. The sash window disclosed in said European application comprises means on the sash window for moving the guide parts relative to the sash window. Said means comprise a handle coupled with angle bars, on which the guide parts are mounted.
The presence of movable guide parts on the sash window itself has the disadvantage that with such a sash window unit always relatively large side members of the sash window are necessary to house the respective components. This is especially considered to be a drawback in case of large sash windows, which may sometimes have a large area of up to 7 m.sup.2, as these windows will then become excessively heavy, giving rise to extremely large forces exerted on the guide parts and coupled components with consequent increased wear.
Sash window units have been in use for over a century already for many buildings, such as houses, factory workshops etc. The invention is, of course, not limited to such older sash windows, but can also be used in the case of sash window units yet to be fitted. Sash windows have the advantage that they do not involve swinging windows or the like, and are thus not affected by wind. Moreover, windows which swing outwards in houses directly beside the street or a pavement are forbidden, and windows swinging inwards require empty window sills. A relatively large area of a window can be opened in a simple way in the case of sash windows.
The means for holding the sash window balanced in an open position are often designed in the form of a counterweight which is connected by a cord to the sash window by means of a pulley, and which lies in a weight shaft in or near the frame.
Apart from the practical advantages, the appearance of sash windows also gives them an aesthetic advantage compared with other types of windows.
Sash window units are still being placed in new buildings, and there are also a large number of listed buildings with sash window units which have to be restored, and in which the sash windows must be retained, but where sound and heat insulation are essential. Therefore there exists a need of improving known sash units.
The object of the present invention is to provide a solution to the abovementioned problems and to provide a generally improved sash window unit. To that end the sash window unit according to the invention is characterised in that the guide parts are stationary, and that the closing means form part of the guideways.
According to the invention, it is therefore made possible to use a sash window in said unit with relatively small dimensions of the side members and consequently having a relatively small weight. The sash window can be closed in an essentially airtight and soundproof fashion, without the sealing means being impeded in any way during the upward movement of the sash window in the frame, and so-called "skewing" or pulling out of square of the sash window in the frame, possibly resulting in it becoming jammed, is also prevented.
Per se, stationary guide parts and closing means forming part of the guideway are known from FR-A-2 339 045, however the sash window unit disclosed therein differs from the present unit in the following aspects. The movement of the sash window relative to the frame is relatively large and every guidew
REFERENCES:
patent: 1551510 (1925-08-01), Campbell
patent: 1629017 (1927-05-01), Burroughs
patent: 1738183 (1929-12-01), Hickman
patent: 2426474 (1947-08-01), Trammell, Sr. et al.
patent: 5012611 (1991-05-01), Hsu
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