Патент USA US2406144код для вставки
Aug. :20, 1946-. w. P. HERMAN‘ CONTACT BLADE ASSEMBLY _ 2,406,144 I V ' Filed June 14, 1941 ‘ INVENTOR ATTORNEY , Patented Aug. 20, 1946 2,405,144 UNITED STATES PATENT OFFICE 2,406,144 CONTACT BLADE ASSEMBLY William P. Herman, Providence, R. I. Application June 14, 1941, Serial No. 398,098 1 A 2 Claims. My present invention relates to the manufac ture of electrical contact plugs and has particular (01. 173-361) 2 trating my invention, and particularly Fig. 1 thereof, the contact blade illustrated is prefer ably stamped in one, ?at, integral piece. The reference to a novel construction of contact blades and novel methods of assembly of the contact blade comprises the conventional contact por blade with the electric cord. U! tion 32, the intermediate self-anchoring portion, This application is a continuation in part of my copending application Ser. No. 188,262, ?led February 2, 1938, and entitled Contact plug as sembly, issued July 8, 1941, Patent No. 2,248,082. It is the principal object of my invention to pro vide a contact blade which'is ?rmly attached to the cord lead wire against pulls and abnormal and the upper cord receiving portion. The upper cord receiving portion of the blade 32 is provided with a transverse slot 33 adjacent to its upper end, and a second transverse slot 34 below the slot 33 and extending from the opposite edge of the blade 32. The slot 34 pref strains. erably extends inwardly from the blade edge at It is an additional object of my invention to provide a contact blade which can be so attached a slight upward angle so that tension or pull on to the end of a cord lead wire as to provide a the cord lead wire will tend to slide the wire into the slot rather than outwardly. The blade 32 may be soldered or spot welded to the lead wire. The bared end 35, of a cord 35, is attached to the upper edge of the blade Laboratories. Another object of my invention is to provide 20 32, either by soldering or welding, as shown in Fig. 2. The wire is then passed through the slot various methods which will facilitate the secur 33, back through the slot 34, see Fig. 3, and then ing of cord lead wire to the contact blade, which reentrantly bent into the position shown in Figs. are easy and economical to practice, and which 4 and 5 ready for assembly. will facilitate assembly of the ?nal plug. This construction provides a strong relief With the above and other advantageous fea 25 against stresses and strains. Any strain on the tures in View, my invention consists of a novel cord is taken up by the convolutions of the insu arrangement of parts, and novel methods of lated portion of the conductor through the slots manufacture and assembly, more fully disclosed of the blade and very little of the strain is trans in the detailed description following, in conjunc tion with the accompanying drawing, and more 30 mitted to the bared contact portion. While I have described a speci?c constructional speci?cally defined in the claims appended hereto. embodiment of my invention, and a Speci?c meth In the drawing, od of assembly, it is obvious that changes in the ' Fig. l is a perspective view of a self~anchoring size and shape of the parts, in their. relative ar contact blade embodying my invention; rangement, and in the method of assembly, may Fig. 2 is an edge view thereof with the cord be made to suit the requirements for di?erent lead wire inserted therein preparatory to solder strain relief which will withstand much more than the minimum required by the Underwriters plug designs, without departing from the spirit 111%; Fig. 3 is a similar View, the cord lead passed through the second slot after Fig. 4 is a perspective view of the cord soldered and ready for assembly; and the scope of the invention as de?ned in the wire being appended claims. soldering; I claim: blade and 40 1. In combination, a contact blade for an elec Fig. 5 is a plan view thereof. In the manufacture of electrical contact plugs, it has been found desirable to eliminate the use of screws, clamps, or other outside anchoring 45 means. It is therefore necessary to provide a blade and cord lead connection which affords a positive electrical contact of su?icient strength to meet the requirements of the Underwriters’ Laboratories. While the present invention may 50 be applied to any type of blade, for the purposes of illustration I have shown the invention as ap trical contact plug comprising a flat, one-piece, rigid stamping of generally elongated form and having two spaced transverse slots extending in wardly from opposite side edges adjacent the upper portion of said blade, the lower slot ex tending inwardly at an upward angle, and an insulated cord lead wire having its bared end ?xed to one side of said blade adjacent the upper slot and extending upwardly above the upper slot, said insulated wire passing alternately through the upper and then the lower slots and being bent to extend upwardly in alignment with said plied to a self-anchoring blade having intermedi blade. ate shoulders for interlocking with a plug slot. Referring more in detail to the drawing illus 55 2. In combination, a contact blade for an elec trical contact plug comprising a flat, one-piece, '~ p 7 3 ~ 2,406,144 ‘ rigid stamping of generally elongated form and‘ having two spaced transvers slots extending inwardly from the side and adjacent the upper portion of said blade, and an insulated cord lead ‘ (wire having its bared end ?xed to one side of said 5 blade adjacent the upper slot and extending up- r " 4 wardly above the upper slot, said insulated wire , passing alternately through the upper and then the lower slots and being bent to extend upwardly in alignment with said blade. . WILLIAM P. HERMAN.