US2426492A

US2426492A - Compression die

Info

Publication number: US2426492A
Application number: US510426A
Authority: US
Inventors: Dupre Henry Peter
Original assignee: Burndy Engineering Co Inc
Current assignee: FCI USA LLC
Priority date: 1943-11-15
Filing date: 1943-11-15
Publication date: 1947-08-26
Anticipated expiration: 1964-08-26

Description

Aug. 26, 1947.A H. P. DUPRE- x 2,426,492

c'oMPREssIox DIE Filed Nov. 15, 1943 'INVENTOR JYem" eef'a RNEY Patented Aug. 26, 1947 COIWPRESSION DIE vHenry Peter Dupre, New York, N. Y., assigner to Burndy Engineering Company, Inc., a corpora- AtionY of New York I Application November 15,

1 Claim. 1

My invention relates to a novel form of compression die for indenting the sleeve of a connector into a conductor contained therein for securing the two together.

I-Iitherto such dies have been made to a size corresponding to a given diameter of sleeve. A change of sleeve size necessitated a change in the compression die parts. The principal object of my invention is to provide a compression die for accommodating a variety of sleeve diameters without changing parts. Other objects are to provide a compression die capable of accommodating a variety of sleeve diameters without damaging the sleeve by splitting it open, or thinning out the sleeve wall unduly at the bottom of the indentation.

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. 1 is a side elevation of my proposed compression die.

Fig. 2 is a sectional View of the same indenting a maximum size sleeve.

Fig. 3 is a sectional view of the same indenting an intermediate size sleeve.

Fig. 4 is a sectional view of the same indenting a minimum size sleeve.

In the drawings, I have shown a compression die ID, having a plurality of superimposed indenting mounds II, I2 and I3 having diminishing base areas forming annular recesses at the point of junction. That is to say, if the base of the compression die I has a transverse dimension (1, the largest indenting mound II may have a reduced dimension l1 Projecting therefrom, the secondary indenting mound I 2, having a further reduced base dimension c is formed, and last, the smallest indenting mound I3, may have the smallest base (1. While three reductions of mound dimensions are shown, this is by way of example only, the use of two or more being contemplated, depending on circumstances.

In Fig. 2, I have shown the compression die I0, and the holding die 20, within which is contained the sleeve 2l, about the conductor 2,2. A hydraulic tool, not shown, but possibly of the type shown in the patent to Matthysse No. 2,254,613 may be used for indenting purposes.

In this large size of connector sleeve, the three concentric mounds II, I2 and I3 are used to establish the indentation. Where an intermediate size sleeve 23, is used, only mounds I2 and I3 enter the sleeve, as shown in Fig. 3. In Fig, 4

194s, serial No. 510,426

2 the smallest sleeve 24, is entered by mound I3 only. The holding die 20 may be used for the different sizes for I have found that a small harmless flattening of these sleeves which may occur, does not interfere with such use.

Where the compression die is not depth-controlled, and descends to the same point with each stroke, the largest size sleeve will receive the deepest impression. In the #2 AWG size conductors, an impression up to of the diameter will not split or unduly thin out the metal at the lowest point clue to the provision of the

circumferential recesses

25 and 26, wherein the well dened lines of junction apparently establishes a firm grip on the metal in the recesses and carries the metal with it in its downward movement, maintaining a substantial thickness at the deepest point. A depth of 50% of the diameter of the #8 AWG conductor may be obtained with intermediate size conductors varying between 50 and 70%.

all height of the combined mounds, and the smallest and intermediate heights may be 35% of the total height. Where vthe impression die may be depth controlled a uniform ratio of the depth of impression with respect to the diameter of the sleeve may be employed. The mounds may be circular, oval, or otherwise shaped at their base sections.

The sides of the mounds may be tapered slightly to facilitate withdrawal from the sleeve, and the tip of the die should be rounded to avoid cutting the metal.

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:

An indenting tool for indenting a metal tubular sleeve to a wire, said tool comprising a lower die part having a transversely extending semi-cylindrical groove for supporting a sleeve therein; a longitudinally extending indenting die having a base with encircling sides forming a tip portion Thef smallest mound may be 16% of the effective over-v extending from the base and circumferentially rounded on all sides from the base to the center of the tip, said tip having a maximum diameter less than the minimum diameter of the base; said indenting die being provided with a shoulder having a flat face which extends transversely to the longitudinal axis of the die, said shoulder connecting said maximum diameter of the tip to the base of the indenting die; and means for controlling the distance that the indenting die is capable of moving into the sleeve supported in the semi-cylindrical groove of the lower die part, to a point substantially in excess of twice the Wall thickness of the sleeve from the bottom of the semi-cylindrical groove, and less than the diameter of the sleeve,

HENRY PETER DUPRE.

REFERENCES CITED The following references are of record in the le of this patent:

Number UNITED STATES PATENTS Name Date Connery Apr. 21, 1925 Davis Mar. 1, 1938 Dobrick Dec. 31, 1940 Wiegand July 25, 1933 Haller May 9, 1939 Walton Nov. 8, 1881 Legere Feb. 8, 1916 Grout Jan. 4, 1887 Pinchart-Deny et al. Feb. 6, 1923 Zeh Mar. 13, 1934 Eden, Jr Aug. 4, 1936 Matthysse Sept 2, 1941 Coover Oct. 22, 1872 Cadwallader, Jr May 21, 1940