US2186322A - Method of forming boxes with one or more nipples - Google Patents

Description

Jan.'9, 1940. Q 5 BROWN 2,186,322

G BOXES WITH ON Jan; 9, 1940. 2,186,322

METHOD 'OF FORMING BOXE WITH ONE OR MORE NIPPLES c. 5. BROWN Filed May 8, 1937 5' Sheets-Sheet 2 IIIIII/IIIL J l940- c. s. BROWN 2,186,322

METHOD OF FORMING BOXES WITH ONE OR MORE NIPPLES File d May 8, 1937 3 Sheets-Sheet 3 A TTORNEYS the views.

Patented 1 I S A S PAT NT FICEA a METHOD -OF" FORMING; BOXES WIT v ORlMORE nI PnEs v I Charles Syracuse, N. Y. Application May 8, 1937, Serial No. 141,506

J N E' 1 Claim. 4, (ores-148.2)

, I This invention relates to-the manufacture of ing the punching out operation 'metal boxes having nipples, as electric conduit outlet boxes, having tubular nipples forreceiving conduits. x I

It has for its object'the'method of forming conduit outletboxes, as hereinafter; set forth andclaimed.

In describing this invention, reference is hadv tov the accompanying drawings in which like characters designate corresponding parts in all Figures 1 and 2 are'sectional views, through'av pairof forging dies, Figure 1 showing'the operation of the dies, after they have formed the blank into box form with projecting nipples; Figure 2 being a view similarto Figure 1, shownippleslinto tubular form. a Figures Band 4 are sectionallviews similar to Figures 1 and 2 of additionaldies that may be used during the punching out nipples. 1 H

Figures 5 and 6 are face views' of thejforging dies shown in Figures 3 and 4, the finishedlbox being shown in broken lines,.Fi'gure 6. j

The methodaconsistsfin forming the box by forging. the same-iromya blank first into a box body with one side entirely open :oropensubstant ially throughout its area, and with one or more solid nipples; then 'forming thenippl'es j with axial passages .communicating'with the inaxially, as by punching,- while holding the nip- {the nipples at IT; e a I 'Th'e use of the second pair of'dies, ll, I2 may l in some cases be necessary to equally distribute.

the nipples and during the operationof the terior of, the boxby displacing the metal ofthe central part of the nipples by a force applied ples to a predetermined shape to control the' displacement of the metal into asymmetrical formation, as into a tubular or cylindrical formation, and finallyremoving the portion ofthe wall of the boxlike body in linewith the passage of the nipple or nipples, so-that the hollow nipples open in the boxlike body.

The apparatus consists of a pair dies formed with cavities shaped to forge the "blank into a box body with one or more solid; nipples" projecting therefrom and punches mov-.

able between the dies in a direction axially of punches displacing the metal of the nipples'into the nipple cavities to fill the same.

i I and} designate, respectively,'the opposing forging .die sections formed with a cavity be-v tween them for shaping the box 3 and the solid nipples 4. The dieQl-is provided with a projection or core 5 for forming the interior of the body'of the box. The portions Got the cavities of the solid foperationof the of forging forming the nipples 4 are of such size ordiamdisplaced by the forging operation forming the nipples, so that there is a clearance in the portions .6, as at 1.

8 are punches mounted between the die sec tions l, 2, there being one punch for each nipple..These punches are forced inwardly by any tially fill the portions 6 of the cavities so that the walls of the portions iisymrne'trically shape the nipples during the punching operation. I

As seen-in Figure '2; the punching operation terminates a little short of the inner end of the nipple or shortpofgthe interior ofthe boxpor- ,tion-of the blank, leaving a .thinslug at 9, which may be afterwards removed in any suitable mannerjas by additional punchinsybor ng or drilling,

after the blank'is removed from the dies How-- ever, as seeninFigures 3 and 4, the blank, after "it is forged, with the solidnipples, as in Figure 1,

veteras not'to be'completely filled by the metal suitable means axially into-the nipples 4 and displace the metal of the nipples, so as to substanmay beplaced in another pair jofdies II and l2 fitting the preformed blank, after it is taken "from the dies 1,2, and thecor'e piece l5 isformed with transverse passages 20. axially alined with the solid-nipples 4. iThe' corepiece is also'formed with a: cavitylll5a, with. whichfthe transverse passages 20 communicate a to receive the metal displaced while thepunches are working in the transverse passages 20;

the metalinto the nipple cavities when it is unequally distributed in -these cavities, after the ;firstforging. operation by the dies l 2'. l 1 l8 designates the punches suitably mounted between the sections I! and {2 in passages alined with the nipples! and .the transverse passages 20, these punches havingreduced end portions I9 for .entering' the passages 20, which are of less diameter than the finalfbor'e'of the nipples.

Whenforce is applied to move the punches l8 inwardly, the'bod yf of each punch of larger diameter forms the axial passageof the nipple and the portion [9 of smaller diameter moves into the passage -2il,. and in "so doing provides 'an annular shoulder -2l at the" inner end I of the nipple againstwhi'ch the end of the conduit received in the. nipple, abuts. The metal displaced duringj the'. punching operation fills up the clearance l1, so that the cavity portions form the nipple to a predetermined shape and size during the displacement of the metal by the punches l8. l

The box, as finally formed, is shown in dotted lines in Figure 6 as an elongated box open at one side, with a nipple 4 at each end and lateral ly extending nipples between its ends, this being one conventional form of electric conduit outlet box.

Under the requirements of the Board of Underwriters, electric conduit outlet boxes must stand certain tests, as tostrains, etc., and an outlet box formed by this method-and apparatus What I claim is: l l

The method of making metal boxes open at one side with one or more conduit-receiving nipples, consisting in forging a blank into a boxlike body having one side open substantially throughout the area of said side, and one or more solid projecting nipples, then punching out the nipple or nipples in an axial direction from their outer ends inwardly while holding the nipple or nipples and the body to a predetermined shape during the punching operation, and finally cuttingthe wall of metal at the inner ends of the nipple or nipples so that the passage or passages of thelnipple ornipples formed by the punchingdisplacing operation, open into the interior of the body.

CHARLES S. BROWN.

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