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236 Sliding glass doors sliding actions are illustrated in 235. Figure 235:1 is one type of track for doors up to 601b (27.210 kg) weight, using steel top channel and two nylon pulleys per door screwed to the back, while 235:2 is a different track for doors up to 25 lb (11.330 kg) weight with nylon sliders (235:2C,

D) instead of pulleys. There is no bottom channel with either type, thus preserving a flush surface for easy cleaning, and the doors are held in position by metal or nylon guides (235:IB, 2E) which are screwed to the centre of the carcass base (235:4). As there is a fair gap between the doors, a buffer-stop is necessary (235:1 A, 4), or pinched fingers will result. The doors can be made dustproof by fitting bevelled strips (235:3) which are glued and pinned to the leading edges, and the necessary clearance is obtained immediately a door is moved.

Sliding glass doors

The general principles are the same as for sliding wood doors. Figures 236:1, 5 show a pair of glass doors which can be either 3/16 in (5 mm) or 1/4 in (6 mm) plate, depending on the overall size, and with all edges rounded and polished. These slide in twin channels or grooves at top and bottom of the carcass opening, either worked in the solid or with one wide groove divided by an inset hardwood strip; or various channel sections can be fitted (236:2, 3 and 4). Figure 236:2 is the standard brass channel velvet lined for easy running, as bare metal alone gives a somewhat hard and gritty action; 236:3 is a metal channel with inset plastic strip, and 236:4 a plastic or fibre channel. The last is somewhat clumsy in appearance but offers little friction. All these channels are let in flush, and in every case the top channel is approximately 3/8 in (9.5 mm) deep and the base channel 1/4 in (6 mm) deep, for assembly is effected by pushing the doors up into the top channel and letting them fall into the base. In effect, therefore, the overall height of the doors will be the exact size of the opening plus 1/4 in (6 mm) for the bottom channel, and a bare 1/8 in (3 mm) for the top. As these measurements are fairly critical it is rarely safe to order by measurement alone; moreover the carcass may not be truly square, therefore it is a wise precaution to cut sheets of plywood or hardboard, test that they enter and run freely in the channels and use these as templates for purchasing the glass.

An improved sliding action for glass doors is shown in 236:5, 6 which offers definite advantages. Top and bottom metal channels are provided, also a sprung U section for the bottom of the doors and a metal carriage (236:6A) with inset metal or nylon balls. As this carriage is free to travel independently it must be longer than the width of the door or the latter will tip off, and assuming a 3 ft (914 mm) wide carcass opening with two doors, then the top and bottom channels will be 3 ft (914 mm) long, the U channel two lengths 18 in (457 mm) long, and the carriage two lengths 2 ft 2 in (660 mm) long. Here again the doors are lifted up into the deeper groove of the top channel and allowed to drop into the lower. This fitting is an improvement on the older type of carriage (236:7) in which small vulcanite wheels were used.

237 Glass door grips

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