Builder's hardware; a manual for architects, builders and house furnishers . of support is directly overthe centre of the door, there is no tendency to bind; while asthe track is secured to only one side of the door-pocket, thepossible effects of shrinkages and settlements are reduced toa minimum. A form of door-hanger which is essentially the same as this,but in which the axle of the wheels work in a slot on the j>rin-ciple of the Hatfield sheave, lias been manufactured by DOOR SPRINGS, CHECKS, AND HANGERS. Burditt & Williams, for one of the Boston builders, but has re-ceived no patent, an
Builder's hardware; a manual for architects, builders and house furnishers . of support is directly overthe centre of the door, there is no tendency to bind; while asthe track is secured to only one side of the door-pocket, thepossible effects of shrinkages and settlements are reduced toa minimum. A form of door-hanger which is essentially the same as this,but in which the axle of the wheels work in a slot on the j>rin-ciple of the Hatfield sheave, lias been manufactured by DOOR SPRINGS, CHECKS, AND HANGERS. Burditt & Williams, for one of the Boston builders, but has re-ceived no patent, and is not really in the market. The Emerson door-banger, Figure 157, is yet anothervariety, and represents in some respects a different principlefrom any of the former, in that the rollers are entirely separateand distinct from each other, being connected merely by a thinstrip of wood notched over the axles. The rollers bear on thewooden rail C. The hangers D, to which the door is directlyattached, are fastened to a rider bar E, which bears directly on 103 Chapter Fig. I 58. Endless Anti-friction Parlor-door Hanger. Reading Hardware Co. the rollers. This form of hanger is very effective, does notget out of order, and works very smoothly. Adjustment isobtained by a small set-screw in the attachment of the track is fastened to one partition only. Figure 158 is a very ingenious combination of the principlesof the Warner and the Prindle hangers. It consists ofa set of double, flanged wheels A, bearing on two tracks, whichare bolted to each side of the pocket. The axle of the doublewheel supports a ring B, which in turn supports a plain,grooved, pulley-wheel. The axle of the pulley-wheel turns iniron flange-plates which are fastened to the top of the this way the friction is greatly reduced ; and the principleof the continuous run of the axle, which is embodied in the Warner hanger, is here provided for by means of the ring 104 BUILDERS HARDWARE. Chapter vi. c
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