. Illustrated catalogue and general description of improved machine tools for working metal . long intension. Maximum stroke of piston in straining-head, 24. Hydraulic scaleshown in position. holders and specimen in place. The compressionplatforms are on the floor. 320 Wm. Sellers & Co., Incorporated, Philadelphia, Pa. and the bearings allowing ample room for this travel even when the heads arethoroughly lubricated. This head is thus entirely cut off from the rapid vibra-tions of the straining screws, and the necessity of making the nuts an exceedinglygood fit to both screw and head i
. Illustrated catalogue and general description of improved machine tools for working metal . long intension. Maximum stroke of piston in straining-head, 24. Hydraulic scaleshown in position. holders and specimen in place. The compressionplatforms are on the floor. 320 Wm. Sellers & Co., Incorporated, Philadelphia, Pa. and the bearings allowing ample room for this travel even when the heads arethoroughly lubricated. This head is thus entirely cut off from the rapid vibra-tions of the straining screws, and the necessity of making the nuts an exceedinglygood fit to both screw and head is entirely avoided. The straining-head is provided with a piston packed to receive fluid pres-sure in either direction, and the piston-rod passing through a packed bearing inone end is provided with a screw-thread, similar to that on the draw-bar, toreceive the various holders. The fluid is supplied to this straining cylinderthrough two systems of jointed pipes, which are connected through the valves atthe scale-case with the pressure pump and the tank respectively, so that each pipe. acts either as a pressure pipe or an exhaust pipe, depending upon the direction inwhich the strain is to be exerted upon the specimen. The Emery testing-machines are now made horizontal instead of vertical;in the first place to make all sizes of machines of one type, and in the secondplace to get certain advantages in overcoming the shocks of recoil. In all but thevery smallest size of machines, the weighing-head and the hydraulic cylinder orstraining-head are carried and aligned by the top surface of a wrought-iron bed,as shown in the view of a 200,000-pound testing-machine, Plate No. 259, thestraining-head on the right hand and the weighing-head on the left, back of whichstands the scale, and to its right is the pump ; in the foreground are the parts ofthe tension holders. Wm. Sellers & Co., Incorporated, Philadelphia, Pa. 321 Plate No. 259.
Size: 1865px × 1339px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidillu, booksubjectmachinery
