Baths – closets – sinks – and spittoons – Ventilation – Bowl structure or vent valve
Patent
1982-09-08
1985-06-25
Artis, Henry K.
Baths, closets, sinks, and spittoons
Ventilation
Bowl structure or vent valve
4213, 98116, 251133, E03D 902
Patent
active
045244693
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the technical field of ventilation means, especially for a water-closet, as described in the Swedish patent specification No. 7904292-5.
BACKGROUND ART
In said patent specification is described a ventilation means for evacuating odorous air from the bowl of the water-closet through an internal fan system for discharging to the sewer pipe of the toilet. The fan system comprises a non-return valve, which however is difficult to construct so that it operates well. The fan system must not be dimensioned so that it produces a too high over-pressure in the sewer pipe. As a matter of fact, it is desirable that the non-return valve should operate at such a small pressure difference as 5 mm of water. For obvious reasons, it is important that the non-return valve has an adequate sealing in the closed position. I have found it difficult to make a satisfactorily operating non-return valve.
More specifically, the present invention relates to a combined fan and valve for evacuating air from a space. The combined fan and valve comprises a housing having an inlet and an outlet and a fan wheel and a drive shaft. By means of the combined fan and valve according to the present invention, the above mentioned problem is solved.
In U.S. Pat. No. 4,133,060, a combined fan and valve is described wherein the fan wheel as well as the valve body are affected by the rotation of the drive shaft. When the shaft rotates, the valve body is lifted from its valve seat by means of a centrifugal device and links. However, this device requires that the shaft rotates in order that the centrifugal device shall lift the valve body. Thus, friction will arise at the connection point between the links and the valve body, which due to the fact that it bears upon the valve seat is immobile, which requires that the drive motor have quite a high starting force. A motor having a low starting force can hardly be used in this construction. Moreover, the link means is a potential source of failure and requires maintenance.
It is an object of the present invention to provide a fan having a valve, which has satisfactory sealing in the closed position, but still can be safely opened for ventilation.
Moreover, it is an object of the invention to provide a ventilation means, which can be driven by a simple and weak low voltage motor without any major power consumption, and which is simple to manufacture, has few integral parts and is simple to maintain.
DISCLOSURE OF THE INVENTION
The above objects are provided according to the invention by means of the fact that the fan wheel is assembled with a sealing membrane for sealing against a valve seat in the housing. Moreover, the fan wheel is provided with threads having a high pitch for cooperation with corresponding threads on the drive shaft. When the drive shaft is standing still, the fan wheel and the sealing membrane are forced against the valve seat. However, when the drive shaft rotates, the fan wheel and the sealing membrane are lifted from the valve seat by means of said threads in order to open the valve and allow the fan to evacuate air from said space.
Preferably, the fan wheel and the sealing membrane are forced to cooperation with the valve seat by means of gravity, but this operation can also be performed or helped by means of a spring. Preferably, said threads are spindle threads having such a high pitch, that the friction forces are overcome by means of gravity, such that the fan wheel is forced, upon the still-standing drive shaft, to the position where the sealing membrane bears against the valve seat.
Eventually, the fan wheel can operate one or several micro switches in at least one of its end positions, for operating other equipment.
BRIEF DESCRIPTION OF THE DRAWINGS
For the purpose of exemplification, a preferred embodiment of the invention is described below with reference to the appended drawings. FIG. 1 is a sectional view of the combined fan and valve according to the invention.
BEST MODE FOR CARRYING OUT THE INVENTION AND INDUS
REFERENCES:
patent: 1425903 (1922-08-01), Roth
patent: 1529711 (1925-03-01), Parrott et al.
patent: 2098208 (1937-11-01), Madden et al.
patent: 2615469 (1952-10-01), Schofield
patent: 3287743 (1966-11-01), Coates
patent: 3826183 (1974-07-01), Rudine
patent: 3888166 (1975-06-01), Stottmann
patent: 3942422 (1976-03-01), Kawai et al.
patent: 4055113 (1977-10-01), Monroe
patent: 4133060 (1979-01-01), Webb
patent: 4244685 (1981-01-01), Lahtinen
Artis Henry K.
Lagerstedt & Krantz AB
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