Builder's hardware; a manual for architects, builders and house furnishers . he springhas a double power; first, by the friction of the door as itcloses, and secondly, by the door coming in contact with theshoulder at the end of the spring. There is a special form ofspring used to close this door consisting of a straight coil, witha hook on the jamb and a shoulder 011 the door. There are a few variations of the Barlow door-checks, butthey all act on essentially the same principle, and this one willbe sufficient for illustration. A very different kind of checkis that which acts on the principle
Builder's hardware; a manual for architects, builders and house furnishers . he springhas a double power; first, by the friction of the door as itcloses, and secondly, by the door coming in contact with theshoulder at the end of the spring. There is a special form ofspring used to close this door consisting of a straight coil, witha hook on the jamb and a shoulder 011 the door. There are a few variations of the Barlow door-checks, butthey all act on essentially the same principle, and this one willbe sufficient for illustration. A very different kind of checkis that which acts on the principle of a piston-pump, ofwhich, perhaps, the best known is the Norton article has been on the market a long time, and is usedvery extensively in some parts of the country. Figure 124 will give an ideaof how it appearswhen set. Thecheck consistssimply of aplunger or pistonworking in a cyl-inder. Betweenthe piston and thecylinder head iscoiled a strongspiral spring, andthe piston, aswell as the cyl-inder, is pierced with a small hole to permit the air to Fig. I 24. Norton Door-check. A. J. Wilkinson & Co. DOOR SPRINGS, CHECKS, AND HANGERS. 83 The cylinder is attached to the head of the door-frame, and is Chapter VI. hinged at A. The piston-rod is connected by a hinged-joint with a lever hinged to the frame, and a lever G attached to the door. When the door is opened, the piston is drawn out, the internal spring compressed, and the air enters through the holes in the piston and the cylinder head, filling the space beyond the piston. When the door is released, the spring tends to close it, but the air behind the piston acting as a cushion, prevents the door from closing too quickly or from slamming. The orifice in the cylinder can be made larger or smaller, thus regulating the speed at which the door shall close. The spring is made sufficiently strong to both close and latch the door after the air has escaped from the cylinder. It will be seen that this door-ch
Size: 1794px × 1392px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidbuildershard, bookyear1890
