Building construction and superintendence, by F.E. Kidder ... (1896)
Kidder, Frank E. (Frank Eugene), 1859-1905 · New York, W.T. Comstock · leaf 394
ton. When the door is released, thespring tends to close it, but the air behind the piston prevents thedoor from closing too quickly or from slamming. The spring ismade sufficiently strong to both close the door and to latch it afterthe air has escaped from the cylinder. The main part of the… … Fig. 418. — Blount Door Check same principles as the Norton, but with the spring and cylinder dif-ferently arranged, is made by the Russell & Erwin Manufacturing Co. It has been claimed that in all door checks depending upon an aircushion, the bearings will wear loose after having been used for…
Building
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