Wall fixings for hollow & solid surfaces

Wall fixings for hollow & solid surfaces - Wall fixings...

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Wall fixings for hollow surfaces F s a how to u d h s t m s tever. ixings for hollow tructures (walls, ceilings nd doors etc.) and se them When fixing onto any urface the strength of the fixing is always ependent upon the strength of the actual surface, with ollow surfaces this is generally less than for a olid structure. It is always best with hollow surfaces o try to locate and fix into one of the support embers. This is not always possible and it is ometimes necessary to actually secure onto the covering, be it plaster board, hardboard or wha s When drilling relatively thin, soft materials it is not necessary or desirable to use hammer action if a power drill is used. Before drilling into any void, check for possible concealed pipes and electric wiring. Rubber-sleeved fixing with captured insert As the screw is tightened into the rubber sleeve inserted through the wallboard, the sleeve is compressed against the reverse side of wall. The screw can be removed/replaced if required, the fixing will remain in place through the wall. After the required hole is drilled, the rubber sleeve is inserted through the covering; the sleeve needs to be a fairly tight fit through the hole to ensure that it does not rotate when the screw is tightened. The screw is then inserted through the workpiece and into a tapped insert, which is moulded into the back end of the sleeve. The sleeve has a small rim which stands proud of the outer surface, to allow the workpiece to sit flat against the surface, the back of the workpiece should be relieved around the hole. Various sizes are available; the screws are supplied with the fitting although longer screws of the appropriate diameter/thread can be used where the workpiece is too thick for the screw supplied. Plastic collapsible fixing Very similar to the above fixing but using an ordinary wood screw. The fixing is used in the same manner as the above but they tend to stand up less well to repeated screw removal/replacement as the screw tends to cut a new thread each time it is inserted. Plastic spread fixing An inexpensive fixing which is not reusable - removal of the screw will result in the fixing dropping down the cavity. Drill a hole just large enough to take the head of the fixing.
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An ordinary wood screw of the appropriate length (at least equal to the thickness of the workpiece plus the thickness of wallboard plus the length of the fixing), is inserted through the workpiece and into the fixing by about 2 or 3 turns. The fixing is then pushed through the hole in the wallboard. As the fixing is pushed through, the 'legs' of the fixing are compressed and they spring out once the fixing is through the board. The workpiece needs to be pulled away from the front surface so that the legs of the fixings bear on the reverse side of the wall as the screw is tightened.
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This note was uploaded on 11/27/2009 for the course ENGR 23432 taught by Professor Puliyambath during the Spring '09 term at Punjab Engineering College.

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Wall fixings for hollow & solid surfaces - Wall fixings...

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