Ventilation – Workstation ventilator – Movable
Patent
1997-12-04
1999-06-15
Joyce, Harold
Ventilation
Workstation ventilator
Movable
138 89, B08B 1500
Patent
active
059116234
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an exhaust extractor device for evacuating vehicle exhaust gases from a working area.
1. Technical Problem
Vehicle manufacturers, garages, testing stations, etc, in certain cases make use of installations for exhaust gas extraction for evacuation of exhaust gases from motor vehicles with running engines. Such insulations have suction hoses which are intended to be temporarily attached to the vehicles' exhaust pipe. In a typical installation there is generally a central suction fan which is in continuous operation irrespective of whether the hose is connected to the vehicle or whether it is in its standby position. Normally, there are several work-stations with hoses which are connected in parallel to a common suction fan. If the hose is kept open in a standby state, air will be continuously withdrawn, something which creates a disturbing suction noise and, when there are several work-stations with parallel hoses connected to a common suction fan, the suction power will thereby be negatively affected at those stations where a hose is connected. In addition, open suction hoses are energy-consuming, given the fact that heated room air is unnecessarily withdrawn from a place of work.
2. Background of the Invention
Attempts have been made to eliminate the above-mentioned problems by providing suction hoses in the standby position with a hinged closure flap which is intended to sealingly close against the connection opening to the connector piece which is located at the end of the hose, see for example SE-B 7709129-6. This type of closure arrangement places high demands on the precision and cleanliness of the sealing surfaces. However, the environment in question is relative demanding, the connector piece is dragged across dirty floors and runs the risk of being run over, which may lead to deformation thereof. In practise, this known closure arrangement does not function as intended; instead the flap will not form a complete seal because of deformation and dirt on the sealing surfaces, with disturbing suction sounds as a consequence.
The object of the present invention is to eliminate the above-mentioned drawbacks and thereby eliminate disturbing suction sounds in the standby position of the connector piece for exhaust gas extraction.
The above object is achieved by a device according to the present invention, the features of which are given in claim
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in the following in greater detail by means of one embodiment and with reference to the attached drawings, in which
FIG. 1 shows an installation for exhaust gas extraction provided with the device according to the invention,
FIG. 2 shows a cross-sectional view on a larger scale through a connector piece in an attached position provided with the device according to the invention,
FIG. 3 shows a view corresponding to FIG. 2, though with the connector piece in a standby position, whilst
FIG. 4 shows a cross-sectional view through the connector piece along line IV--IV in FIG. 3, whilst
FIGS. 5-7 show three different arrangements for retaining a closure member in the standby position.
PREFERRED EMBODIMENT
The device according to the invention forms a part of an installation for the evacuation of exhaust gases from motor vehicles and, as is apparent from FIG. 1, the installation consists of a suction device 1 which is schematically shown in the form of a suction fan 1 with a suction or inlet side 2 and a pressure or outlet side 3. This extends through a wall 4 or a roof of a building in which a number of work-stations for motor vehicles is arranged. The evacuation installation has a conduit system of suction hoses 5, 6 which, in the shown embodiment, each lead to a respective work-station and are connected to the inlet side 2 of the suction device 1. At least one section of each suction hose 5, 6 to each work-station is in the form of a flexible, reinforced hose which can be wound up on a hose winder 7, 8 at each station to thus be adjustable to desire
REFERENCES:
patent: 2733668 (1956-02-01), Pfetzing
patent: 3749131 (1973-07-01), Burger
patent: 4750525 (1988-06-01), Vaughan
patent: 5469890 (1995-11-01), Carpentier
Persson Tommie
Trana Claes
AB Volve
Joyce Harold
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