Saunders' Adjustable Expanding Die is shown in Fig. G. It is designed to be attached to any of the ordinary pipe-threading machines in use for threading steam and gas pipe. The distinguishing features of these dies are the arrang ing of the die-block or head with a number of sets of chasers all fitting into the same, to thread the different sizes of pipe. The head is ad justable and expanding.
the thread being cut in once passing over; when the thread is c'it to the desired length, the cutters or chasers are opened by a movement of the worm, and the pipe released without stopping or reversing the motion of the ma chine. One set of chasers can be withdrawn and an other set inserted in a few minutes ; and adjustment to size is readily effected. These dies do not require to be moved from their place while cutting off the pipe, as they expand to allow the pipe to pass through into the guide in the cutting-off head of machine. The chasers can be taken out and sharpened by grinding ; when too much worn they can be recut and used again, which operation can be repeated several times.
Saunders' One-wheel Pipe Cutter is shown in Fig. 7. The body is provided with rollers for the pipe to rest on, producing a rolling instead of a sliding motion, thereby lessening the friction on the pipe. They also roll down the burr that is raised by the wheel in cutting the pipe. The hinged block with the cutter wheel is so arranged that it will not become detached and mislaid. Saunders' Three-wheel and Roller Pipe Cutter is shown in Fig. S. It will cut off pipe without revolv ing the entire circle of the pipe, thus enabling workmen to reach contracted places otherwise inaccessible, such as against the wall, between floors, or in ditches. Saunders' Pipe Vise is shown in Figs. 9 and 10. In the ordinary pipe vises in use the jaws are so enclosed on all sides that the pipe can only be entered endwise, making it necessary to reserve a space beyond the vise equal to the length of the longest pipe to be screwed. In the improved vise, the top half being hinged, can be opened, admitting the pipe sidewise, and saving about half the room that would be otherwise required. This side opening is
attended with a further advantage—that the vise may be used for holding pipes while elbows, tees, or other fittings are screwed upon one or both ends, or for taking apart old pipe work in which the parts have be come rusted together.
Hubbell's Tapping tapping machine for tapping water, steam, and gas mains, under pressure, shown in Fig. 11, consists of a ease or box adapted to be applied to a main, containing a sliding carriage holding a combined tap and drill, and a stud for screwing the corporation cock into the pipe. The carriage is placed in the machine so as to have an equal press ure above and below, and is adapted to be moved by a rod from the outside of the case, so as to bring either the combined tap and drill or the corporation stud under a socket wrench or actuating spindle, projecting into the ease and operated by a handle at the top, as shown in the cut. The spindle is forced down by the action of a sleeve, outside screw threaded, and passing through a yoke, upon a collar fastened to the said spin dle. the yoke being held in position by two studs or posts projecting from the ease or body of the machine.
Smith's Tapping Apparatus.—Fig. 12 is a sectional view of a machine for tapping water and other pipes under pressure, and connecting branch sleeves, gates, etc. The mandrel or clutter shaft is shown run in and the central drill and tap in position to begin work. After the drill and tap have completed their work of drilling and tapping a small hole in the cen tre of the piece to be cut out, the main cutting tool cuts its way through the pipe. When this operation is completed, the cut ting mechanism, carrying the circular piece cut from the main with it. is run back outside the gate, which is then shut down or closed. Then the tapping machine is removed, lean ing the huh end of the gate ready to receive the spigot end of the pipe that is to be carried wherever required.