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July 9, 1946. _ I ' È. 1:).r KNAB ' 2,403,443 ÍMPALING INSTRUMENT Filed Jan. 13, 1945 /Av/l/E'N TOR 5.0. KNAB ~ v y @JM. Patented July 9, 1946 2,403,443 UNITED STATES PATENT OFFICE 2,403,443 IMPALING INSTRUMENT Emil D. Knab, Lake Parsipany, N. J., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application January 13, 1945, Serial No. 572,692 1 Claim. 1 This invention relates to a punching and per forating tool for mounting a succession of washers upon the central wire of a coaxial cable. An object of the invention is to simultaneously (Cl. 164-86) 2 ceive the upper end of the wire Il upon which the washers are to be placed. Let us now suppose that the operation of per Another object of the invention is to provide forating and impaling washers is to be performed. The handle I6 of the tool is depressed enough so that the cam surface 6 slightly separates the blocks 8 by pushing upon extensions II thereof and a short straight length of wire is thrust up means for and a method of more expeditiously ward through the barrel I2 and into an opening cut and impale upon a Wire a series of washers made from polythene sheet stock or similar ma terial. constructing coaxial conductors. 10 i3 in the plunger 5. The wire Il is adjusted so The nature of an embodiment of the invention that it is centered at the bottom end in a small ` is set forth in detail in connection with the ac groove I4 and clamped into place by a small clamping screw I8. The barrel I2 is of a diame Fig. 1 is a side View of an exemplary embodi ter exactly equal to the outer diameter of the ment of the invention; 15 washers. The handle I `li is now raised which lifts Fig. 2 is an end view thereof as viewed from the smaller plunger 5 upward away from the the left with parts in section; blocks 8 and the withdrawal of the larger plunger Fig. 3 is a top view showing a strip of sheet 4 allows the springs to press the -two blocks 8 to stock in the tool, from one end of which washers gether upon the end of the wire which is centered have been cut; , in the opening defined in the two grooves of the Fig. 4 is a, section on the line 4_4 of Fig. l, look abutting surfaces of the blocks. It is desirable ing downward; that the upper end of the wire be adjusted to lie Fig. 5 is a section on the line 5-5 of Fig. 1; and a Very small amount above the upper surfaces of Fig. 6 is a view of a short coaxial line with the blocks 8. The strip of polythene is now in washers hunched upon a piece of a central con 25 serted and the handle depressed. The small ductor which extends from the outer conductor. plunger forces the wire through the strip, the end In its exemplary embodiment, the invention of the wire passing up into the bore I9 of the comprises a hand-operated tool for simultaneous plunger 5, and at the same time the plunger cuts ly impaling washers and placing them upon the the washer out of the strip with an outer diameter central wire of a coaxial cable. . 30 of a size which just lits the bore I2. I‘he entrance A group of washers mounted upon the central of the wire into the central hole of the washer is wire of a coaxial conductor before they have been effected by lateral displacement of the material inserted in the outer circular conductor is indi hence no chad or circular cuttings are taken out cated at I located in the positions in which they of the hole into which the wire ñts nor does the companying drawing in which: are applied to the wire by the tool; after applica 35 tool require any means for disposing of such tion, the Washers are distributed along the wire chads. The handle and plungers are then re and thrust into the cylindrical outer conductor 2 tracted, the strip moved along and the operation along with the wire and serve to insulate the cen repeated over and over again until the bore I2 is tral wire therefrom. It is found in practice that approximately ñlled with washers; in the embodi the washers are impaled upon the wire rather 40 ment illustrated, it holds about forty to sixty tightly as a result of which considerable friction washers. Although shown as hand-operated, it is offered along the movement of the central wire is quite within the scope of the invention to em and after being distributed they remain in place body the operative elements of the device in within the outer cylindrical conductor 2 as they power operated mechanism. 45 are distributed before being inserted therein. What is claimed is: . The tool for impaling the washers consists of Washer making, impaling and mounting a base block 3 having perforations therethrough means comprising a set of normally adjacent but for two plungers 4 and 5. The plunger 5 performs separable die blocks, means for mounting an elon the cutting and impaling of the washers whereas gated member with an end between the blocks, the plunger 4 comprises a guide and also has a 50 and a sheet of washer strip upon the die blocks, a camming surface 6 to separate two anvil blocks hollow member for cutting, perforating, and im 8 which will be hereinafter referred to. The paling each washer upon a single stroke, means plungers are rigidly connected to a block 9 and simultaneously operable to advance the hollow the length of the plunger 4 is adjustable so that member against the blocks for cutting the Washer, the camming surface `[i will be effective at the and means advancing with the hollow member to proper instant. A narrow flat strip of polythene separate the die blocks whereby a washer is cut is inserted in a diagonal guideway I0 which passes from the sheet, perforated and impaled upon the over the blocks 8. 'I'he blocks 8 are pushed to elongated member and advanced therealong in gether by springs and at their adjoining surfaces a single operation. have small grooves which define an opening to re 60 EMIL D. KNAB.