US1656856A

US1656856A - Electric appliance having pin contacts and method of manufacturing the same

Info

Publication number: US1656856A
Application number: US155959A
Authority: US
Inventors: William J Gagnon
Original assignee: BEAD CHAIN Manufacturing Co
Current assignee: BEAD CHAIN Manufacturing Co
Priority date: 1926-12-20
Filing date: 1926-12-20
Publication date: 1928-01-17
Anticipated expiration: 1945-01-17

Description

Jan. 17, 1928. 1,656,856

W. J. GAGNON ELECTRIC APPLIANCE HAVING PIN CONTACTS AND METHOD OF MANUFACTURING THE SAME Filed'Dec 20 1926 IIVVEIVTOR MTG/van N i m A ATTORNEYS Y 45 by the invention disclosed in m Patented Jan. 17, 1928.

UNITED, STATES g 1,656,856 PATENT OFFICE.

WILLIAM J. GAGNON, OF BRIDGEPORT, CONNECTICO'T, ASSIGNOR TO THE CHAIN MANUFACTURING COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CONNECTICUT. I

ELECTRIC APPLIANCE HAVING PIN CONTACTS AND METHOD OF MANITFACTUBING TIEIES A]IIE. p

' Applicatlonflled December 20, 1926. Serial No. 155,959.

My invention relates to electric appliances having pin contacts, and method of manufacturing the same, and particularly to appliances having frangible bases to which 6 said pins are riveted. The object of .m invention is to so form the frangible bo y at the point at which the in is attached, and to so shape and attach t e pin thereto, that danger of breakage of the frangible body in- 1 cident to the riveting operatlon is minimized.

In theaccompanying drawings- Fig. 1 is a vertical section through the insulating base of an audion tube showing two pins attached thereto, and a third pin in position for attachment;

Fig. 2 is a top plan view of an audion base showing four pins secured thereto in accordancewith my invention;

Figs. 3', 4 and 5 are enlarged sectiona views illustrating successive operations-upon a pin during the attaching operation;

' Fig. 6 is a view similar to Fig. 5, but illustrating the position of the attached pin to a base of different thickness;

1 Fig. 7 is a'section drawn to enlar ed scale and illustrating a slightly modi ed construction; and

Fig. 8 is a similar view illustrating a further modification.

A heavy percentage of breakage is experienced in the attachment of contact pins to the insulating bases of audion bulbs. These bases are commonly made of porcelain,

or glass, or bakelite, suitably apertured to permit the attaching end of the pin to be passed therethrough. To secure this end in position it is common to resort to a spreading or riveting operation, which results in pressure upon the relatively thin diaphragm of the frangible base material. This breakage percentage is rticularly high when the pins used are 0 the solid type. I have succeeded in reducing this loss materially copending application Ser. No. 56,291, file September 14, 1925, in which I have disclosed a tubular sheet metal pin provided intermediate its ends with an open shoulder enlargement, which during the offset or rivetin operation forms a cushion which material y lessens the strain upon the frangible material of the base. A p

However, even with this cushioning collapsible abutment shoulder on the pin, all losses are not avoided. This is, in large part due to thefact that there-is an unavoidable variation in the thickness of the diaphragm of the base incident to its manufacture. Consequently, the upsetting tools which are ad- ]usted to approach each other a uniform distance, bear heavily upon the basematerial and rupture.

Where the thickness of the dia hragm is below normal the upsetting tools 0 not approach each other sufficiently closely to ef-' If)ect the firm attachment of the pin to the ase.

These difliculties have beensolved, according to the present invention, by so' forming the base at the point of engagement with the pin end that a relatively'great tolerance mechanical connection between the pin and the base,'and also relievin rupture strains incident to t e upsetting operation. j

Referring to the drawings, an audion base 15 of conventional type has been illustrated in Figs. 1 and 2, the diaphragm 16 of the base being pierced in usual fashion to er mit the passage of the attachin ends 0 the pins therethrough. I have s own longitudinally split rigid tubular sheet metal pins of the type described in my copending application mentioned, since I regard these pins as the best and most economical forv use. Pins of this ty e are preferably provided intermediate their ends with a collapsible cushioning abutment shoulder 18, although I have found that with the features hereinafter described a cushioning shoulder of this type is not necessary. In

{is afforded with respect to the. thickness of I "the base, while. nevertheless insuring a good the base from 6 -After a pin has been inserted preparatory to upsetting, it is held in position by a suitable support engaged with the lower face of the shoulder 18. The upsetting operation preferably comprises two steps, first, a

. 'tact with t and spreads the split tongues 24 radially.

The spreader is outward in all directions. so shaped that it does not bearagainst the diaphragm 16 of the base, and consequently little or no rupturing stress is exerted. The tongues 24 are, however, pressed outward over the relatively sharp lip 20, forming the upper margin of the aperture, but a firm engagement therewith is not established by I the spreader.

The action of the spreader is followed by the action of the tubular upsetter tool 22. The working end of the latter is inwardly bevelled at 25, as indicated in Figs. and 6, so that onl its 'outer edge 26 comes in con lie tongues 24. The travel of the spreader 22 toward the diaphragm 16 of the base is so predeterminedthat the working edge 26 of the upsetter. does not force the tongues 24 down to the bottoms of. the

recesses 19. Consequently, no severe or rupturin pressure is exerted thereby upon the diap ragm 16, while, nevertheless, the

ton ues 14 are bent down into the recesses 19 y su cientl to firmly grip the lip 20 of the recess an thus securely rivet the pin in position. 1

The fact that the upsetter 22 does not bear against the diaphragm 16 when the latter is of normal thickness, insures a generous tolerance for variation in the diaphragm thickness, without danger of rupturing stresses being exerted by the upsettcr 22 upon the diaphragm. Nevertheless a firm connection is established even when the diaphragm is of sub-thickness, as illustrated in. Fig. 6, since the upsetting of the tongues 24 over thelip 20 is sufficient even under such conditions to firmly rivet the pin to the base.

In Fig. 7 I have shown a recess 19 of slightly different shape from that shown in Figs. 3 to 6, the outer margin of the recess being substantially parallel with the pin axis.

In Fig. 8, instead of a recess, I have shown a lip 27 raised above the upper surface of the diaphragm. This necessitates a mouse somewhat longer pin neck, but strengthens scribed, so long as the upsettingtool 22 depresses the tongues 24 only toward, but not to, the surface of the diaphragm 16.

Breakage is practically eliminated by an attachment of this character, and since breakage resultsndt only in the loss of the base 15, but in the discard of a plurality of pins as well, the saving is very material.

While I prefer to use pins of the character shown, it will be readily understood that the present invention may he applied to the attachment of pins of various types, particularly to other types of tubular pins. It will be understood, therefore, that the accompanying illustration and the foregoing de-' scription are merely illustrative of the thoughts which underlie my invention, the scope of which is pointed out in the fol* lowing claims.

I claim 1. The method of attaching a contact pin to a frangible body having a pin holetherethrough, and a lip at the mouth of the hole, said lip being above the level of the surrounding surface of the body, said method comprising the steps of mushrooming the projecting pin end and deflecting the marginal portion of the mushroom toward but not against the surface by pressure applied to said marginal area of the mushroom beyond thearea of the lip.

'2. The method of attaching a contact pin to a frangible body having a pin hole theret-hrough, and a lip atthe mouth of the hole, said lip being above the level of the surrounding surface of the body, said method comprising the steps ofmushrooming the projecting pin end and causing the latter to bind against the lip by deflecting pressure applied to the mushroom beyond the area of the lip, and causing the portions of the mushroom to which said pressure is applied to approach, but not bear against, the surface of the frangible body.

3. A frangible body perforated to receive a contact pin, and'having on one face and at the mouth of the perforation a marginal lip above the level of the surrounding surface, incombination with a contact pin liaving a shoulder bearing against: the opposite face of said body, and a mushroonied end frictionally engaging said lip, the margins of said mushroom beyond said lip approaching, but out of contact with, the surface which it overlies.

In testimony whereof I have signed my name to this specification.

WILLIAM J. GAGNON