US1530319A - Fuse plug - Google Patents

Description

March 17, 1925. 1,530,319

H. T. PAlSTE FUSE PLUG Filed Oct. 27, 1922 Patented Mar. 17, 1925.

UNITED STATES PATENT OFFICE.

HENRY T. PAISTE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO H. T. ZPAISTE COMPANY, OF PHILADELPHIA, VANIA.

PENNSYLVANIA, A CORPORATION OF PENNSYL- FUSE PLUG.

Application filed October 27, 1822,

To all whom it may concern:

Be it known that I, HENRY T. PAISTE, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented a Fuse Plug, of which the following is a specification.

One object of this invention is to provide a fuse plug of the type including a renewable fuse-carrying capsule, which shall be simple and substantial in construction and which shall insure good electrical contact between the fuse on the capsule and the terminal shell on the plug body.

another object of my invention is to pro vide a fuse plug of the above type including a body of insulating material of novel form particularly adapting it to be con veniently held and turned when it is desired to screw the plug into or out of a receptacle.

I also desire to provide'a capsule carrying a relatively fusible link and especially designed for use in a fuse plug of the above noted type, the invention including a novel construction for holding in place the otherwise free end of the fusible element so that this will not spring outwardly from the capsule and become bent or broken.

It is further desired to provide a fuse plug body with novel means for removably holding therein a capsule carrying a fuse or fusible link. i

In the drawings herewith:

Figs. 1 and 2 are respectively a side elevation and a plan of the fuse plug constituting my invention;

Figs. 3 and 4: are respectively a side elevation and an inverted plan of the fuse plug capsule;

Figs. 5 and 6 are respectively a plan and an inverted plan of the fuse plug body with the capsule removed;

Fig. 7 is a longitudinal vertical section on the line 7-7, Fig. 5; and

Fig. 8 is a longitudinal vertical section of the fuse capsule taken through the fusible link.

In the above drawings, 1 represents an elongated, substantially cylindrical casing of insulating material such as porcelain, having one end closed and formed with a cavity 3, which while for the most part of circular cross section, has a portion 4 ad- Serial No. 597,328.

jacent its open end of polygonal section, in the present case hexagonal. The external cylindrical surface of the casing 1 has longitudinal grooves 5 extending from one end to the other, each communicating with radially extending grooves 6 formed in the open end of the casing, which latter grooves open into the cavity of said casing.

Mounted on the open end of the casing 1 is a threaded sheet metal shell 7 formed to screw into a standard lamp socket or receptacle and having one edge notched or forced into certain of the longitudinal grooves 5, as indicated at 8. Those grooves into which said shell is extended are formed with shoulders 5) against which the portions 8 of the shell abut to prevent it being drawn off the end of the casing. Said shell '7 is inwardly flanged as indicated at 10 so as to extend over the otherwise open end of the casing 1 and is thereafter cut to form a series of angular tongues 11 which are bent into the portion 4-. of the cavity to lie immediately adjacent the flat walls thereof. These tongues however do not. lie immediately in contact or parallel with said walls but extend toward each other so as to form more or less yielding contact members for engagement with a fusible link on the fuse capsule. The radial passages 6 in the end of the casing permit of the escape of gases from the cavity 3 into the longitudinal groove 5, since the tongues 11 are spaced away from and make a more or less loose fit with the walls of the casing.

The fuse capsule consists of a morc or less tapering body including a portion 12 of circular section and a portion 13 of hexagonal section formed with an integral head or flange 14. This structure is made of porcelain and the body 1213 is formed with a cavity 15 opening into its unfianged end. A strip of relatively fusible metal 16 has one end in electrical engagement with a metal terminal 17 in the form of a piece of sheet material having a branched bod extending into the flange 14v. and including two oppositely projecting semi-circular portions lying against the otherwise flat outer face of said flange adjacent the center thereof.

One end of the fusible strip 16 extends between the branches of this terminal menu her and is formed in two tongues bent at right angles in opposite directions so as to lie parallel and: in engagement; with. the semi-circular portions of said terminal 17.

From the latter the link extends centrallythrough the flange into the cavity 15, of the fuse; body, then outwardly through a notch in the edge of the open end thereof and back in engagement with the external; surface of said body to the under side of the flange. Here it is offset as indicated at 18-, beingfbent into a recess of said flange so as to be effectually held. in place and then extended radiallyfout. over' the under surface ofthe flange.

The body 12-1'3 is of such dimensions as to be capable ofenteringthe cavity 4 -3 of the casingl, the flat sides of-the portion 13 being formed tocooperate with the spring tongues 11, which frictionally engage it to removably hold. the capsule in thecasing after it has been inserted. When in this position, the portion ofthe fusiblelink extending over the externalsurface of' the body 12 -13 is electrically engaged" with one of, the tongues 11 and when the capsule is forcibly pressed into engagement with the turned'in portion lO of thelshell 7, the latter engages the outwardly projecting part 16 of'the link. i

The casing with its parts and the capsule therefor constitute a fuse plug which may be screwed into a receptacle of suitable construction, whereupon the oppositely. projecting ends l6 -of the fusible link are ens gaged with one terminal ofsaidsreceptacle, from which the circuit is completed through the fusible link to one of the spring tongues 11, thence to the threaded shell"? andto the second terminal of the receptacle.

In the event ofan abnormally heavy current flow through the fusible link 16, this is fused in the ordinary manner and, as abovefnoted', any, gases formed or resulting from this fusing, pass out between the tongues 11' and'the wallsofthe cavity 3, thence into the passages 6 and'to the grooves 5, through whiehthfey are-led so as to eS-, cape-into theair.

By reason-of the; polygonal cross section of=the portion-4 of the casing 11 and of the openingin the shell 7, the similarly formed portion 13 ofthecapsule body-is prevented from rotating,- after being inserted. Asa I consequence when the plug is rotated by a turning force applied to its casing 1, the capsule,is likewise turned; and niay, be withdrawn withthe body from the receptacle in which the plug is used.

I.- claim-:

1. The: combination in a fuse, plug of a threaded shell inwardly fianged at: one end and having spring tongues projecting inwardly from the inner edge of said flanged end; anelongatecb hollow casing of insulating material having an open end fitting into said threaded shell; and having-itszopposite end integral with its bodyqand' closed; there being grooves extending longitudinally in the outer surface of saidcasing andipassages in the edge of the open end thereof; coniinunicating with. its hollow, interior, with a capsule having a portionforined to pass through the opening in the flange of the threaded shell into the casing, and including a link electrically engaging one off the spring tongues, one end of the link terminating atone end of the capsule,

i. The-combination in a fuse plug of; an elongated substantially cylindricalbodyof insulating material integrally; closed at one end and havinglongitudinally extending grooves inits external surface; radial'pas' sages in the edge of the open enduof said casing; a threaded metallic shell fixedion the casing including a flange extending-inwardly over theedge of the open end thereof and having spring tongues projectinginwardly into the cavity'of'thecasingy with a fuse'capsule comprising a body havinga flange atone end formed with a recess in its under side, a fusible link extending from the outer faceof said" flange through the body, then longitudinally overthe; external surface thereofinto the recessin theunder side of the flange.

8-. A; fuse plug capsule. including abodyportion having an externalflange; aternlinal plate on theouterface; and'a-fuse link, having one end engaging said terminal plate, extendingtherefrom through the body portion of the capsule to the-outside thereof, thence longitudinally -overthe external surface of'the capsule and'in-to a-recess in the flange, and then radially outward overthe under surface of the flange;

HENRY T PAISTE;

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