TECHNICAL

Door performance and cycles

HI-LOAD hinges are independently tested to British and European standards. Even under more rigorous test conditions, standard quality

HI-LOAD hinges exceed the stringent BSI requirements showing no significant sign of wear after 1,000,000 cycles and requiring no need for lubrication.

Hinge positioning

Normally, three hinges are fitted to each door. Their positions are determined by the weight of door and its resistance to warping or

whipping. Royde & Tucker will advise which of the position variations shown below should be used. Hinge specification is also determined

by the adjusted door weight (based on the actual weight supplied by the manufacturer).

Hinges for use with doors of excess widths

Wider doors obviously increase the pressure and bending movement exerted on the hinge. This must be allowed for by reduction in the maximum mass of the door leaf supported by each class of hinge. The factors by which the door mass has to be adjusted for excessive widths of door are calculated by dividing the door height by its width. For a factor of

2 or greater, no allowance has to be made. When the factor is less than 2, the door mass has to be increased by the value required to bring the factor to 2 expressed as a percentage. These percentages are shown in the Side Loading Calculations Table.