Ventilation – Workstation ventilator – Movable
Patent
1991-09-04
1993-06-29
Joyce, Harold
Ventilation
Workstation ventilator
Movable
F23J 1104
Patent
active
052229068
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an exhaustion device of the kind which is intended for the removal by suction of exhaust gases and other environmentally harmful gases from a working area or location, or from the exhaust pipe of an automotive vehicle, and which comprises a suction line which is connected at one end thereof to a central suction means or to a suction fan and the other end of which is intended to be connected temporarily to the working location or to the exhaust pipe of an automotive vehicle, or some like location, for the purpose of removing therefrom by suction waste or exhaust gases generated in the working location or by the automotive vehicle.
Exhaustion devices of this kind are used in vehicle workshops, vehicle-inspection localities and vehicle-repair shops which are intended for other types of motor vehicle than cars, lorries (trucks) and buses, e.g. for such vehicles as tractors, forestry machines and agricultural machines. The exhaustion devices are operative to remove the exhaust gases generated when running tests on the engines of such vehicles and/or when bench-testing the engines in closed areas. Such exhaustion devices are also used in other kinds of workshops and also in laboratories, for the purpose of removing by suction environmentally harmful gases and vapours that are generated in such working locations, e.g. for the removal of welding gases from welding sites and from cutting machines. Exhaustion devices of this kind normally include a flexible suction hose which is provided at one end thereof with a connector or like device operative to connect the hose to the exhaust pipe of an automotive vehicle, or to a gas-collecting box or like device arranged over a workplace. In order to enable the hose carrying the connector to be connected, for instance, to the exhaust pipe of a vehicle, it is necessary for the hose to have a given length, and the greater the length of hose available, the greater the spatial working range of the exhaustion device. In those periods when the device is not being used to remove exhaust gases or other environmentally harmful gases or vapours, it is necessary for the hose to be stowed in some way or another, so that the hose will not be left hanging, with part of the hose lying on the floor, and therewith cause an obstacle to other work.
In order to overcome this drawback, it is known to wind the hose onto a reel fixed to the ceiling or a wall of the locality concerned, such as to enable a required length of hose to be uncoiled from the reel and the hose connected to the vehicle exhaust pipe. Such reels are normally provided with a spring device which is operative to recoil the hose automatically, i.e. with a powerful spring which when the hose is pulled from the reel is tensioned to an extent sufficient to rotate the reel automatically when the pulling force is removed, and thus re-wind the hose. In order to achieve automatic re-coiling of the hose after use in the case of an exhaustion device of such a kind, it is necessary, however, to use an extremely powerful spring with the subsequent drawback that an extremely large force must be applied to the hose in order to draw the hose from the reel, particularly when the hose is to be uncoiled to the extent of its full length. If the hose is not unwound to its full length, since a shorter hose-length will suffice, as is often the case, the flow resistance through the remaining turns of the hose will increase, resulting in a reduction in the exhausting ability of the device.
As a result of these and other drawbacks this kind of gas-exhausting device has been used to an increasingly smaller extent and the device has been replaced with exhaustion devices with which a required length of hose can be withdrawn from within a tube which is carried substantially horizontally by a wall-mounted, pivotal carrier arm and which is connected to a suction fan or to a central suction outlet located in a main suction line. The end of the hose located in the tube is sealed against the tube suc
REFERENCES:
patent: 495141 (1893-04-01), Norton
patent: 1691816 (1928-11-01), Klyce
patent: 2023263 (1935-12-01), Blume
patent: 2415740 (1947-02-01), Gammack
patent: 2665647 (1954-01-01), Knutson et al.
patent: 3435752 (1969-04-01), Capstran
patent: 4086847 (1978-05-01), Overmyer
Fumex AB
Joyce Harold
LandOfFree
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