No_5_May_1969 — Page 44

Non-panic bolt

Four components make up the de- vice: the bolt-hole plate for screwing to the door frame; the body that is screwed to the door; the bolt, which slides in a slot in the body; and a retaining plate with four fixing studs, that fits over the body.

When the other three pieces are in position, the studs of the retaining plate are pressed into four holes in the outer face of the body. This has the dual effect of tightly sealing the bolt in its slot and hiding the heads of the screws with which the body has been fixed to the door. The retaining plate is also the piece that gives way under pressure from the bolt when the door is pushed from the outside.

The non-panic bolt is made in white polyurethane and measures 21⁄2 by 1% by 9/16 in. deep (64 by 32 by 14 mm), excluding the bolt-hole plate. The photograph shows an assembled unit at the top-right, and the four com- ponents below; the bolt is in the posi- tion it would be if the door were forced open and the retaining plate (front) displaced.

SEALING STRIPS

Filler strips moulded from rubber reinforced with natural and synthetic fibres have been introduced by Green- gate and Irwell Rubber Co. Ltd., Odsall Lane, Salford, Lancs., to seal the

Profiled filler strip

interstices between corrugated sheeting and the structural framework.

The strips are made in a range of profiles matching commonly-specified makes of asbestos-cement, aluminium, iron and translucent sheeting. They are normally fixed by drilling through to accommodate a hookbolt. Once in place they provide a positive seal

against the ingress of moisture and do not contract or expand with tempera- ture changes.

The material's properties also in- clude resistance to rot and corrosive atmospheres, and it is not attacked by birds or vermin. Another advantage claimed for the filler is that it will not lose its outer skin or crack if the sheeting moves.

In the case of cladding or where double-skin roofing may overhang the purlin, the strength of the compound allows the final course of sheeting to be screwed to the filler piece, or the top and bottom sheets to be closed by fixing through the material.

The filler strips are available in a range of 20 to 24 in. (203 to 609 mm) lengths, 1 in. (25 mm) wide as standard.

DIMMER CONTROL

The PH 200 Dimlite solid state lighting dimmer control from Photain Controls Ltd., Randalls Road, Leather- head, Surrey, UK, incorporates a new type of patented radio interference type of patented radio interference circuit.

The unit is capable of controlling 200 watts of tungsten lighting load at 240V a.c. and has an overall size of 3in. x 3 in. x 14in. which will fit a standard MK plaster depth (7/8 in.) box without modification or spacers. box without modification or spacers.

It is complete with an on/off switch and will vary the amount of lighting from full brilliance down to 15 per cent. of total load. As well as providing a variation in the lighting to suit the need of the moment, this unit effects savings due to the reduction of current consumed.

PLAN FILE

A shallow drawer sectional plan file introduced by E.N. Mason & Sons Ltd., Colchester, Essex, UK, provides space for drawings of all sizes up to antiquarian size.

Each drawer is lin. deep and holds about 100 drawings. Twin hinged flaps are fitted at the front and a deep hood at the back to prevent the drawings from curling. By using drawer dividers, the system can be used for filing small sized drawings. These dividers can be placed in position in a drawer instant- ly, to accommodate any size of draw ing, so that there is no wastage of filing space.

The cabinets are available in ten- drawer sections with separate tops and plinths. Construction is in heavy gauge furniture steel. Drawer fronts are fitted with card holders for indexing. Handles are plated and the stoved enamel finish

Mason shallow drawer chest

is in a choice of Olive Green or Ham- mer-toned Grey.

Agents are: Tan Kwang Seng & Co., Singapore.

DRAINAGE SYSTEM

A new economical underground drainage system which uses p.v.c. pip- ing has preformed glass fibre inspection chambers. It is available in 4in. (101,6 mm) and 6in. (152,4 mm) diameters and uses a polypropylene coupling for jointing plain-end pipes.

The jointing action of the coupling has in-built provision for any sub- sequent pipe expansion and saves labour time because welding is not required. The inspection chamber can be linked to any existing piping.

Extruded in standard lengths of 10ft. (3,05 m) and 20ft. (6,1 m), the piping gives accurate alignment at joints. Its smooth bore gives good flow characteristics. It is resistant to impact and abrasion, flexible and will accommodate ground movement.

As all the joints in the system em- body locked-in ring seals to eliminate the possibility of displacement on jointing, laying can proceed regardless of weather or trench conditions. Test- ing and backfilling of the system, including inspection chamber installa- tions, can follow immediately after laying.

Plastidrain, Ltd., Pollard Moor Works, Padiham, Burnley, UK, are the makers.

TAPS

Most fittings in the range of bath, basin and sink taps and mixers manu- factured by James Barwell Ltd., 40 Great Hampton Street, Birmingham, 18, UK, can now be supplied with clear acrylic headwork. The new fluted shield heads follow the same design as the makers' chromium-plated mo- dels. They give greater thermal insula. tion than metal headwork.

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Far East BUILDER, May 1969