US2951227A - Multitap transformer terminal and insulator securing means - Google Patents

Description

' Aug. 30, 1960 E. s. CORNELL, JR 2,951,227

MULTITAP TRANSFORMER TERMINAL AND INSULATOR SECURING MEANS Filed Dec. 31, 1956 Z64 INVENTOR.

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XMJFFM/ United States Patent MULTIT AP TRANSFORMER TERIVIINAL AND INSULATOR SECURING MEANS Edward S. Cornell, Jr., Westport, Conn., assignor to Burndy Corporation, a corporation of New York Filed Dec. 31, 1956, Ser. No. 631,960

1 Claim. (Cl. 339-32) My invention relates to a multitap transformer terminal, by which I mean a transformer terminal to which a connection may be made in either a horizontal or a vertical position.

Previously, a standard eye and basket design was employed, wherein an eyebolt mated into a basket with vertical grooves or lips provided for horizontal or vertical entrance. The conductor was inserted into the eye, and upon tightening the nut, compression was achieved and a connection made.

Among the objects of my invention are to provide a multitap transformer terminal having a large surface contact area whereby aluminum, as :well as copper condoctors may be suitably secured; to provide such a terminal in a design that lends itself to manufacture by plastic deformation whereby the metal will be work hardened to approximately the ultimate limit of the alloy being used; and to provide a locating means for holding the terminal to the transformer insulator whereby a single size terminal may be assembled in a variety of customer installations, thereby reducing the cost of manufacture and inventory requirements.

I accomplish these and other objects and obtain my new results as will be apparent from the device described in the following specification, particularly pointed out in the claim, and illustrated in the accompanying drawing, in which:

Fig. !l is a perspective View of my multitap terminal mounted to the insulator of a transformer.

Fig. 2 is a longitudinal sectioned view of the terminal itself.

Fig. 3 is the conductor inserting end view of the same.

Fig. 4 is the transformer insulator attaching end view of the same.

Fig. 5 is a plan view of a tongue and groove pressure bar modification.

Fig. 6 is a sectional view of a modified form of clamping screw and bar attaching means.

A cylindrically shaped terminal body 10 is preferably employed, as is shown in Fig. l. The shape may be obtained on a screw machine, or by forging, casting, or drawing, and is preferably formed by plastic deformation which work hardens the metal to a degree approaching its ultimate limit.

The body has transverse and axially positioned cable holes 12 and 14, respectively, the axes of which are 90 apart to provide the horizontal and vertical connections.

In the plastic deformation process, hole 14 is formed for one of the positions of the cable connection. Hole 16 is also formed on the opposite end of the cylindrical body and threaded for receiving one end of threaded post 18 inserted through the transformer insulator 20.

A drilled and tapped hole 22 transversely positioned with respect to holes 12 and 14, is provided for the clamping screw 24. A pressure bar 26 having crossgrooves 28 and 30 is inserted into the junction of the holes 12 and 14.

, 2 The pressure bar may be a solid element, as illustrated in Fig. 2, or two sections 32 and 34 which are assembled within the hollow body at interlocking grooves 36 and 38, respectively, as shown in Fig. 5.

The pressure bar is centrally apertured as at 40 for the clamping screw tip 42 which is inserted therein and peened over to provide a unitary assembly of screw and bar, one rotatable with respect to the other.

A locating means 44 for aligning the terminal assembly to the insulator is illustrated in Figs. 1 to 4. It comprises a washer-like element with extending ears 46 for locking into the recesses 48 of the insulator. The 10- cating means may be of any type corresponding to the different insulator requirements. Each, however, has an opening 50 with a fiat side 52 to permit fitting over the stem 54 of the connector body, which is similarly shaped to receive the washer in a drive fit to prevent accidental loosening.

Thus a single connector body may be accommodated with an interchangeable locking member having an external shaft corresponding to the particular customers requirement. This reduces the cost of manufacture and the inventory requirement. The change is made economically and easily as the insulator design is made known.

The foregoing design provides a connector body made of work hardened metal. The pressure bar is provided with generous surface contacting areas for engaging aluminum as well as copper cables, since aluminum requires more surface area than copper in order to avoid fiattening the wire, with loss of contact. Horizontal or vertical connections may be made to the terminal, as is evident from the construction shown and described.

A modified form of clamping screw 24a and pressure bar 26a is shown in Fig. 6. The end of the screw is spear-shaped as at 42a, with the point slotted as at 42b to permit the spear points to be resiliently cammed together at taper 40a into recess 40b, until the shoulder 42c of the spear engages stop 400 of the pressure bar. When the screw is inserted into the connector body and the pressure bar is inserted through the conductor opening, thus eliminating the peening operation previously described, the two parts may be snap fitted to each other.

I have thus described my invention, but I desire it understood that it is not confined to the particular forms or uses shown and described, the same being merely illustrative, and that the invention may be carried out in other ways without departing from the spirit of my invention, and, therefore, I claim broadly the right to employ all equivalent instrumentalities coming within the scope of the appended claim, and by means of which, objects of my invention are attained and new results accomplished, as it is obvious that the particular embodiments herein shown and described are only some of the many that can be employed to attain these objects and accomplish these results.

I claim:

A termination for a transformer having a post threaded at one end, comprising an insulator mounted coaxially on said post, a terminal for attachment to said post including a cylindrically-shaped body member having axial and transverse joining holes for alternatively receiving conductors spaced apart, a pressure bar positioned inside the holes having crossed conductor engaging surfaces, a clamping screw threaded to said body member and adapted to compress said pressure bar to the conductor, a socket axially in line with said axial hole for joining said terminal to the threaded end of said post, a stern section coaxial with said socket, .a washer-like part coupled to said stern section and locked against relative rotation therewith and mating means on said insulator 3 V and washer-like part to prevent relative rotation there- 2,105,129 between. 2,499,985 2,719,277 References Cited in the file of this patent UNITED STATES PATENTS 5 246 096 1,016,146 Hawes Jan. 30, 1912 343:073

1,934,581 Bach Nov. 7, 1933 4 R-idgers Jan. 11; 1938 Cafiero Mar. 7, 1950 Rice Sept. 27, 1955 FOREIGN PATENTS Switzerland Dec. 15, 1946 Germany Jan. 28, 1922

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