A low coefficient of friction, slipper castor (Fig 7) manufactured from an engineering plastics material, has been introduced by Howard Clayton-Wright Limited. Designed to provide controlled movement of furniture on carpeted surfaces, the castor has a convex circular form of base to ensure that the load is spread over the maximum area, thus minimising crush and damage to the carpet. Howard Clayton-Wright England.
The concept of Tribology is described in a new leaflet produced by Mintech. It is designed to convey to the engineering industry the benefits of Tribology and has short notes on environmental effects and choice of type of bearing and materials. One interesting point about the leaflet is the inclusion of the addresses and phone number of the Regional Offices of MinTech. Available from the Ministry of Technology, Millbank Tower, Millbank, London SWl.
In place of the conventional gland or stuffing box, a nitrile ‘0’ ring has been housed which is not subject to abrasive wear. In conventional mechanisms where the gland packing is of fibrous material, friction between the brass spindle and the fibre causes wear and this can give rise to leaking. ‘Imperial Metal Instruments Limited, Kynoch Works, Witton, Birmingham 6, England.
A bath tap (Fig 6) embodying a non-rising spindle type mechanism which eliminates friction surfaces is being manufactured by lM1 Developments Limited. Wholly constructed in an acetal copolymer, they are suitable for both hot and cold water. The non-rising spindle differs from conventional types in that the washer stem is not free to rotate against the tap seat. It is raised and lowered by means of specially formed threads inside a rotating spindle of female configuration. The washer stem is constrained by a square orifice in the head nut and as toraue is auulied through the handwheel. it is translated via the washer .&em in a p&ely axial direction and no rotation between tap washer and seat occurs. Where washers are free, an abrasive scuffing action is set up which leads to breakdown of the washer causing the tap to leak.
For many years oils and greases have traditionally been used for protecting metals and other surfaces. Recently Takdust products enlarged on this concept and developed Peelable grease as a protective medium. Peelable grease is a liquid that looks like grease and can be applied to components in the same way as grease. However once it has been applied it dries to a tough plastic film. The grease can be used on all metals, ceramics, glass and any non-solvent-sensitive surface. When required the film can easily lifted and peeled away in one sheet (Fig 9). Peelable grease has been suggested for many different uses including protection of components awaiting assembly; masking machinery during painting; protection of components and machinery whilst it is stored; and as a packing material. The ‘grease’ has already been used to protect machinery whilst in use against the buildup of such substances as welding splashes, printing inks, sulphide lye, molten fibre glass, and resins and paints. Price 23/6d per gallon. Takdust Products, shire, England
Hayes Lane, Lye, Stourbridge,
Non-loading, coated abrasive papers traduced by Armour are claimed as inpolishingand finishing. The coating surface ahd resists flaking, ChiDDinE
which have been ina major breakthrough is bound to the abrasive and Dowderinp.