(57) @ The water-tight door 10 of a safe or strongroom is hung on two double-articulated
hinges 12,13 (Figure 1). Each hinge includes an intermediate element 18,18A connected
by a pivot pin 19,19A to a mounting block 16,16A on the door frame 11, and also connected
by a pivot pin 20,20A to a second block 17,17A on the door itself. This articulated
connection permits, firstly, swinging of the door about the axis of the pins 19,19A
when it is opened and closed. Secondly when closed the door is clenched inwards against
a sealing strip 52 by throwing a series of tapered bolts 54 (Figure 3), in so doing
the intermediate hinge elements 18,18A turning slightly relative to the door about
the pins 20,20A. In the upper hinge 12 a compensation spring 40 (Figure 5) acts between
the intermediate element 18 and the door block 17 so as to keep these parts rotated
relative to one another in the direction opposite to the relative rotation performed
during clenching. By this means the tendency of the door to twist under its own weight
on the double hinges is resisted.
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