Builder's hardware; a manual for architects, builders and house furnishers . Fig. I I 7. Reliance Door-spring. Chicago Spring-Butt Fig. I I 8. Engine-house SpringJ. B. Shannon & Sons. the cut, the spring would force the door open, which, ofcourse, is the intention in an engine-house; but the same prin-ciple could be applied to springs which are to close a door. DOOR SPRINGS, CHECKS, AND HANGERS. 7!) The spring is tightened at the bottom, and the upper lever-armworks through a staple and pulley-wheel on the door. For light screen-doors a spring is sometimes used winch actsby the twisting s
Builder's hardware; a manual for architects, builders and house furnishers . Fig. I I 7. Reliance Door-spring. Chicago Spring-Butt Fig. I I 8. Engine-house SpringJ. B. Shannon & Sons. the cut, the spring would force the door open, which, ofcourse, is the intention in an engine-house; but the same prin-ciple could be applied to springs which are to close a door. DOOR SPRINGS, CHECKS, AND HANGERS. 7!) The spring is tightened at the bottom, and the upper lever-armworks through a staple and pulley-wheel on the door. For light screen-doors a spring is sometimes used winch actsby the twisting strain or torsion of a single steel rod. Figure119. The two side pieces, A A, are screwed to the upper flange is fastened to the door and has a catch fittinginto the ratchets of a drum attached to the rod. As usuallyapplied, the rod is not strictly vertical, but is at an angle withthe door jamb, so that when the door is opened the rod is sub-jected to both a torsion and a bending strain. If the rod iswell tempered, the bending strain, of course, gives it an addedefficiency. Figure 120 is a form of torsion door-spring
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