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Devices for Ventilating Passenger Vehicles
Page 154
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Brief Descriptions of Types of Ventilator which are on the Market ASSENGER-VEIIICLE operators ,E cannot fail to realize the need for the efficient ventilation of their machines, when consideration is given to the importance of this factor in relation to the comfort of passengers. In view of this, a few notes upon some of the patterns of device which are marketed may be appropriate.
Messrs. Airvac Ventilators, of Honeypot Works, Darlington, offer their wellknown Airvac, which is arranged on the slotted-vane principle. In order to ensure exactly the balance of ventilation that is necessary both at high and low road speeds. a couple of slotted vanes are situated in .front of two forward apertures in an oval-shaped cowl, another pair being placed just behind tho two rear orifices in the cowl. At low road speeds a stream of air passes through the foremost slots and is deflected outward. The same stream then passes aft to the rear openings and is deflected into them by the rear vanes.
Inside the ventilator the stream is drawn forward over the main aperture in the base plate, and the speed of the current is increased by the interior contours of the Airvac, so that it draws with it air from the interior of the vehicle. At greater speeds the air flow "jumps" the slots, the extraction of spent air being set up by negative pressure at the faces of the slots and around the top and outer edges of the vanes.
Auster, Ltd., of Crown Works, Barford Street, Birmingham. markets a device under the name of Visolator, which constitutes a windscreen at the top of which is a narrow glass strip ; this is transversely hinged and is made to open.
The main screen is of the single-panel type. At each side there are guides, which are equipped, at various intervals, with slots, so that different sizes of aperture may be obtained. In front and above the windscreen is a smoked-glass visor.
Auster, Ltd., manufactures several other types of ventilator, amongst which may be mentioned the usual pattern of hinged roof light, as well as louvres for use above main side windows.
Beckett, Layeock and Watkins-on; Ltd., Acton Lane, London, N.W.10, is, of course, well known for its Beclawat D60
devices. The company is shortly to place on the market a new fitting, called the Ventilouvre. This is for use above drop-windows. The chief point with regard to this form of ventilator is to embody the framework of all the louvre glasses with the gutter rail. The object is to have a continuous line running along the side of the vehicle, which would form a gutter rail, its lower edge acting as the top section for the glass ventilator.
The brackets for the sides of the ventilators are brass pressings and are made in two patterns ; one is for use at each end of the vehicle, whilst the other is designed for employment at intermediate points. The latter type is a double fitting, so that it will hold the right-hand and left-band ends of two glass louvres, Various designs of roof ventilator, including the well-known Sidno fitting, are offered by Cooper, Webb-Jones and Co., Stockwell Works, Walsall, Staffs. The Sidno device is claimed to be weatherproof and care has been taken to prevent backdraughts. It is symmetrical in design, taking the form of a cylinder 24 ins, high and 91 ins, in diameter. Besides this device, the company markets ordinary roof lights which open outward, ventilators for interior use, such as those of the circular and hitand-miss patterns, and rectangular plates having rows of square orifices. A foot-operated scuttle ventilator is also produced Cox and Co., of Lower Richmond Road, London, S.W.15, is engaged in
the manufacture and sale of a large variety of products, including windscreens, hood frames, trunks, tilt covers• and blinds, so that it is natural for such an item as a ventilator to take quite an important part in the company's output. Therefore a useful device is marketed which is embodied in the top rail of the Cox patent windscreen, an advantage being that no extra fitting is necessary on the part of the coach-, builder.
The Ashanco air intake and the ex-, tractor marketed by George Johnston, Ltd., 173-177, Shaftesbury Avenue, London, W.C.2, are to be found on many long-aistance coaches, whilst they have recently been successfully tried out on
London,:ibus. The former device is suitable for incorporation in the front bulkhead and is specially designed to. permit an ample volume of fresh air to enter the interior of the vehicle.
The bulkhead fitting, when employed in conjunction with four side-type Ashanco air extractors, is claimed completely to change the air in the interior every three or four minutes. Both the interior and exterior aspects of the Ashanco ventilators are neat, so that they may be made to harmonize with the general decoration schemes.
Several types of ventilator, including a neat combined ventilator and roof lamp, are offered for sale by William McGeoch and Co., Ltd., Warwick Works, 46, Coventry Road, Birmingham. The diameter of this fitting is 51 ins., whilst the overall depth is 21 ins. Then there are several slottedplate devices, both rectangular and circular. Those of the former shape are available in five sizes, ranging from 6 ins. by 3 ins. to 10 ins. by 3 ins. ; the latter are 7 ins. and 8 ins, in diameter.
A new ventilator, called the Zephyr, has been constructed by the Palnut Co., Ltd., of Morley House, 26-30, Holborn Viaduct, London, E.C.1. It is based on strictly scientific principles and has undergone searching tests in various climates. The Zephyr is a roof fitting, consisting of two parallel open extractor cylinders connected to a vacuum channel by two suction pipes, which are constructed on the well-known streamline principle.
The spent air in the interior of the vehicle passes through the bottom of the valve and then travels out through the cylinders. The speed of the draught passing through the valve is in close relation to that of the air travelling through the cylinders. The ventilator is simple in construction and, therefore, does not obstruct the free passage of air. It is claimed to be weatherproof and has a good appearance.