Ventilation – Means combined with window – Having air passage between sill and bottom of sash
Patent
1991-04-16
1993-03-16
Joyce, Harold
Ventilation
Means combined with window
Having air passage between sill and bottom of sash
454274, 454334, E06B 702
Patent
active
051940400
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a slot ventilator, for example for use in a room with a sealed window or double glazing wherein it is desirable to provide ventilation without having to open the window.
BACKGROUND PRIOR ART
Slot ventilators are known but they have always required a substantial dimension perpendicular to the face containing the slot in order to achieve effective opening of the slot by moving a facing strip for closing the slot by movement essentially parallel with the face containing the slot.
For some applications a slot ventilator is desirable with a very short dimension perpendicular to the face containing the slot and that is achieved in accordance with the present invention.
SUMMARY OF THE INVENTION
According to the present invention there is provided a slot ventilator comprising an elongate slotted backing member and an elongate facing strip mounted by a spaced parallel-motion link to the backing member such that longitudinal movement of the facing strip also produces movement thereof towards or away from the backing member between a closed position obstructing a slot in the backing member, and a forward open position; the link being pivoted at one end to a rib extending from the facing strip into the slot, and at the other end to the backing member, the rib being cut away or otherwise shaped to accommodate the pivotal connection between the link and the backing member.
The cutaway enables the pivotal connections respectively to the rib and the backing member to be separated by only a short distance in a direction perpendicular to the plane of the slot while the, or each, link need only be a little longer than the desired amount of opening movement of the facing strip away from the backing member.
Each link is conveniently of "U" cross-section being pivoted to the backing member at the bottom of the "U" and pivoted to the rib at the top of the "U" where the two arms are on either side of the rib. The two arms of the "U" may be closely spaced on either side of the rib to provide an adequate support when the facing strip is in the open position. In spite of the cutaway to accommodate the pivot to the backing member, the rib can be of sufficient extent into the slot to provide adequate engagement surfaces for the arms of the "U" of the, or each, link.
Preferably both the backing member and the facing strip are formed from extruded sections of uniform crosssection, possibly from aluminium or an aluminium alloy or of a suitable plastics material.
DESCRIPTION OF THE DRAWINGS
The invention may be carried into practice in various ways and one embodiment will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a perspective view of a slot ventilator.
FIG. 2 is a diagrammatic plan view to an increased scale showing the relationship between the backing member and the facing strip and a link in each of the closed and the open positions, and
FIG. 3A is a sectional end view of FIG. 2 with the facing strip in the open position and in the closed position to the right of the centre line.
FIG. 3B is a sectional end view of FIG. 2 with the facing strip in the closed position.
DETAILED DESCRIPTION
The slot ventilator shown generally by reference number 1 comprises a backing member 3, a facing strip 7 and a parallel motion linkage supporting the facing strip on the backing member.
The backing member 3 comprises an elongate strip with a slot 4 extending lengthwise along it, and two parallel flanges 5 extending rearwardly from the slotted strip. The flanges 5 are disposed close to the longitudinal edges of the slotted strip, on either side of the slot 4.
The facing strip 7 has a rearwardly extending longitudinal rib 8 which at all times projects into the slot 4.
The parallel motion linkage comprises two parallel links 12 made of a tough, resilient plastics material such as that sold under the trade mark "Delrin". Each link 12 is "U" shaped, the gap between the arms of the "U" accommodating the rib 8, and the outer faces of these arms lying
REFERENCES:
patent: 2207671 (1940-07-01), King
patent: 3392658 (1968-07-01), Korff
patent: 4727797 (1988-03-01), Smith
patent: 4736677 (1988-04-01), Smith
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