Ventilation – Having inlet airway – Sleeved vent for ceiling – wall – or floor
Patent
1996-11-19
2000-04-11
Joyce, Harold
Ventilation
Having inlet airway
Sleeved vent for ceiling, wall, or floor
454213, E06B 7084
Patent
active
060482664
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a ventilator, for example to a glazed-in ventilator. A glazed-in ventilator is a ventilator which may be installed between the edge of a window pane (or window panes in the case of multiple glazing) and the window sash or other adjacent structure. The invention may also relate to ventilators such as slot ventilators, which may be installed in apertures formed through or in the region of, such as above, the frames of doors or the frames or sashes of windows.
GB 2135045 discloses a ventilator comprising an elongate flap having first and second ends, first and second connection means located at the first and second ends respectively, the connection means connecting the flap to support means and being arranged to permit the flap to rotate about a longitudinal axis thereof. A problem with this ventilator is that the flap has to be manufactured to very accurate tolerances and, if it is slightly too short, due to the resultant end-float, the structure of the ventilator is not rigid enough, and, if it is too long or too short, the flap is liable to jam in extreme cases. The first and second connection means include friction washers for holding the flap in a selected rotational position. Again, the length of the flap needs to be very accurate since, if the flap is slightly too long, there will be too much friction, and if the flap is too short, there will not be enough.
The present invention aims to alleviate these problems.
According to a first aspect of the present invention, a ventilator comprises an elongate flap having first and second ends, first and second connection means located at the first and second ends respectively, the connection means connecting the flap to support means and being arranged to permit the flap to rotate about a longitudinal axis thereof, and biassing means arranged to bias the first end along the longitudinal axis. This has the advantage that the structure of the ventilator is more rigid than in the prior art. The biassing means may be included in the first connection means.
Preferably, the biassing means is arranged to bias the first end of the flap towards the second end of the flap.
In a preferred embodiment, the biassing means comprises a bearing element located on one of the first end and the support means, and a resilient projection carried on the other of the first end and the support means, the bearing element having a generally conical or tapered bearing surface substantially coaxial with the longitudinal axis of the flap, the projection engaging the tapered bearing surface. In this case, the projection may engage the bearing surface frictionally to couple the rotational orientation of the flap relative to the support means.
According to a second aspect of the present invention, there is provided a ventilator comprising an elongate flap having first and second ends, first and second connection means located at the first and second ends respectively, the connection means connecting the flap to support means and being arranged to permit the flap to rotate about a longitudinal axis thereof, the first connection means including a friction coupling comprising a bearing element located on one of the first end and the support means, and a resilient projection carried on the other of the first end and the support means, the bearing element having a substantially cylindrical, conical or tapered bearing surface substantially coaxial with the longitudinal axis of the flap, the projection engaging the bearing surface frictionally to couple the rotational orientation of the flap relative to the support means. This has the advantage that the flap can be manufactured to a relatively low tolerance without adversely affecting the friction coupling.
Preferably, the exterior bearing surface is tapered or conical.
In each of the aforementioned aspects of the present invention, the first connector preferably includes an intermediate carrier element which carries the projection, and the carrier element is mounted to the first end of the flap. The carrier element ma
REFERENCES:
patent: 884598 (1908-04-01), Martin
patent: 1600369 (1926-09-01), Sochowitz
patent: 4186656 (1980-02-01), Weber
Joyce Harold
Titon Hardware Limited
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