Neit, Equipment and Publications
Page 56
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Powder Couplings
A powD04, .introdu-ced by speeialloid, Ltd., 20 Black Bull Street, Leeds; provides torque-lit-rifting device, Known as the Dry fluid c6upling, the unit comp sea a hardened steel rotor Which forms the output-Member, and a housing which is driven by the -engine. .
The powder medium is in the form of spherical heat-treated steel shot, which is -impelled outwards by centrifugalforce as the speed of the engine increases to form tightly packed metallic rings between
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the aides of rhe rotor and the perimeter.of:the housing. " Under normal Operating conditions, it provides direct -drive without slip .or loss of efficiency. If necessaryi however, a coupling can be fitted, Which. Slips • at pre determined overload The de-Vice also
zits as a torsional-Vihrafion danMer throughout the speed range of the. power' unit, and does not transfer a. dangerous frequency from one speed range to another.
Floor Paint ARESIN-BONDED paint marketed
_ under the name of Rougatile, • by Weatherproof Compositions, Ltd., Dun mow, Essex, is intended for use on floors, • stairways and other surfaces subject to hard wear and oil or chemical spillage.
The paint, which may be applied by . brush, broom or spray to concrete, stone, brick, timber, metal or composition floorings: gives a non-slip finish and will take pedestrian traffic after 30 minutes and heavy traffic after 2 hours. It can be applied in humid conditions, and is said to give . a tenacious seal unaffected by weathering, petrol, oil or alkalis. Cleaning may be carried out by washing, scrubbing or polishing.
A gallon of the paint will cover from 30 to 40 sq. yd. It is available in red, white or grey, whilst other colours can be supplied to special order.
Tipper Handbook RECOMMENDED lengths and capacities for tipping bodies on most British commercial-vehicle chassis are given in their revised "Tipper Handbook" by Edbro-B. and E. Tippers, Ltd., Quebec Street, Bolton.
End and three-way tipping bodies are covered and the correct Edbro gear for use in each case is specified. A further section of this useful booklet is devoted to a table of weights and measurements for a wide range of materials in lb. and cwt. per cu. yd. and kg. per cu. metre.
Revealing Air Loss DRICED at £1 Is. retail per set of four,
Indicaps are aluminium indicators for screwing on to tyre valves, taking the place of the caps, and showing when 3 p.s.i. has been lost from the normal level of inflation. A small red plunger protrudes when pressure is within 3 p.s.i. of normal, but disappears inside should such a loss of air occur.
This allows a quick visual cheek to be made, but these accessories mabe B22 resgarded as being more valuable as a means for detecting leaks than a substitute for regular checking with a gauge as a drop of 3 p.s.i. from a tyre running at 24 p.s.i., for example, may be considered excessive.
A member of the staff of The Commercial Motor tried a set of Indicaps on his car for 2,000 miles, during which there was no significant loss of air from the tyres—an assurance that the units were probably as effective as valve caps in sealing the valves. When first fitted, the plungers of two of the units were reluctant to appear, but duly popped out after a few miles running. Indicaps are sold by John Somers, Ltd., 142 Edgware Road, London, W.2, pre-setin stages of 2 p.s.i. between 18-34 p.s.i.
Iron-powder Electrodes FERROLUX.. is : an iron-powder electrode introduced ly Qpasf-Arc, Ltd., Bilston, Staffs; for high-speed welding in the flat and vertical Positions. It is stated that such electrodes permit quicker welding and longer runs than conven tional electrodes. ferroluX electrodes are made in lengths of,1 ft. 6 in. in Sizes from 10 s.w.g. to in. diameter.
Sliding Stable Doors
ilEAT loses through large doors in industrial buildings can be considerable. An attempt to solve this problem has been made by Coburn Engineers, Ltd., Peasmarsh, Surrey.
Instead of having two single sliding doors to coVer the entrance, each door is horizontally divided in tWo and a
second sliding provided at the midpoint.. Thus the lower doors may be opened indePendently froth the 'top pair for the passage of Stnall truckk. and staff. When a large vehicle has to enter,. bolts are slid upward, joining the upper and lower sections Cif each door, which can then be slid 'back together complete with the central track.
Securing Hoses DESIGNED for securing delivery hoses to the side of a tanker vehicle, a range of webbing straps covered with p.v.c. to make them oil resistant and waterproof is being manufactured by Tannoid, LtdChurch Row Works, Wandsworth Plain, London, S.W.18.
The standard strap is 3 ft. long and 11 in. wide. Complete with a buckle and end-piece it costs 4s. Normally olive green, the straps can be supplied to special order in any colour or dimension,
Non-slip Tread STEP treads made of aluminium oxide bonded with polyvinyl chlorate, are being manufactured by the Adamite Co., Ltd., 94-98 Petty France, London, S.W.1. After six months' trial on 12 MetroCammell bus bodies, this type of tread. known as the Altro, has been specified for further bodies made by the company.
The material from which the treads are made is flexible and hard wearing, and is said to be non-slip whether wet or dry.
Pump Standard ABRITISH standard for coolant pumps for internal-combustion engines is now obtainable from the British Standards Institution, 2 Park Street, London, W.1, price 5s.
Covering both centrifugal and axialflow pumps for engines up to 250 b.h.p., the publication specifies shaft diameters and housing dimensions, together with recommended sizes for suction and discharge ports.