US1937178A - Fuse - Google Patents

Description

Nov. 28, 1933. T. F. ViNDAL 5, ,1

FUSE

Original Filed July 19, 1929 BY 5: g t

A WITNESS ATTORNEY.

Patented Nov. 28, 1933 UNITED STATES PATENT OFFICE FUSE Thomas Francis Vindal, New York, N. L

Application July 19, 1929, Serial No. 379,467 Renewed May 29, 1933 i 1 Claim. (Cl. 260-121) This invention relates to fuses and has par- 13 for engagement with coacting threads in the ticular reference to fusible material for carrying electrical current.

One of the objects of the invention is to pro= vide e. removable member for installment in on electric circuit, which includes s fusible element for breaking the circuit, with e filament connested in parallel with the sold element, so that on the latter being fused the filament is thereby placed in series in the circuit to accommodate the now of current and visibly indicate the brook in the fuse.

Another object of the invention is the provision of e. fuse which contains a. fusible element having sections of different current cepocity, so that e. filament having its terminals in shunt on sections of large carrying capacity moy he automatically placed in series with sold sections on the fusing of interposed section m o reduced cerrring cspocity.

it further ohject of the invention is to provide n vccuum chsmcer in a, fuse plug in which as filament is installed together with e fusihic ele ment. Ordinarily the letter element carries the electric current, owing to the increased resist once ofiered by the filament, but on the sold ele ment heinu fused the filement carries the cur rent and thereby gives forth light to indicete the breaking of the fusible element.

A still further object of the invention is the provision of u fuse of the sleeve described cher= octer which is simple in construction, eficient and durable for the purpose intended, and ice expensive to manufacture.

With these and other objects in view the in vention resides in certain novel constructions-l features, the essential charscteristics of which, hereinafter fully described, and particularly pointed out in the appended claim, ore illus= trated in the accompanying drawing, in whichz Figure l is u perspective view of my improved fuse plug.

Frc 2 is w enlarged longitudinal sectional view thereof.

M Figure 3 is e, perspective view of the fusible ele= ment and illent.

Figure 4 is o wiring diagram.

Referring particularly to the drawing on refor ence characters, the numeral 1o clesignotes the fuse in its entirety, the body ll of which con structed of porcelain, hard rubber or other in= sulating material, is formed with e. central charm ber 12.

The body ii is provided with a metallic sleeve or covering, which is formed with screw usual socket member, while a. terminal 14 is also carried by said body. Electric current emanating from a source 15 flows through wiring 16, which is connected with the screw threads of said socket member, and through the threads iii. A fusible element 17 contacts with said threads 13 and with the terminal 14, end as the letter terminal contests with or terminal in the usual socket member, which is connected with n continuation it of the Wiring, current is transmittecl to any current consuming device such as e lump 19, there being e switch 20 in the circuit.

The element lt'is constructed with e pair of sections 21, 22 of like current carrying cspscity While, between said sections and preferably integrel therewith, a reduced portion 23 of less con-ring capacity is formed. Contacting with the sections 21, 22 n parallel with the element 17, and bridging the section 23, is at filament 2c of tungsten or the like. AS the materiel of the filsmen; so is of higher resistance than the materiel of element 17, current flows through the letter while illuinent remains unheated; one. as the carrying capacity of the sections 21 and 22 is greater than of the inner section 23, said letter section fuses when the current ininressed on the circuit reaches a certain predetermined demity. After the section 23 has fused or melted to normally break the circuit, current flows in the filament, thereby heating the letter to incom descence and giving forth lightorder to fully utilise the filament for displaying a visible end to clearly distinguish e. fused element from others, when n number of fuses are used together, i prefer to utilize the chamber 12 es a vacuum chamber, but on inert or non-combustible gas may be used in sold chamber without departing from the invention. The body ii is therefore formed with an annular step or shoulder 25, on which, with o ring or collar 26, disc 2'? of glass or other suitable trsns= porent materiel is sealed.

l t lnle hove described what i deem be the most desirable ernhodunent of my invention, it is obvious that more? of the detoils may be varied Without in any way departing from the spirit of my invention, end I therefore do not limit myself to the exact details of construction herein set forth nor to sm th is less than the whole of my invention limited only by the appended cleun.

What is claimed as new is:---

A fuse plug" comprising n body member formed with end and peripherei contacts for engagement with the contacts in o fuse block, the body memt ll her being hollowed out to provide a-chamber, a transparency closing the chamber at the end remote from the center contact and having an air-tight connection with the body member to 5 preclude the entrance of air to the chamber, a

fuse disposed interior to the chamber and connecting the center and peripheral contacts and THOMAS FRANCIS VINDAL.

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