US2483018A - Renewal electric fuse plug - Google Patents

Description

Sept. 27, 1949. E. MELTZER RENEWAL ELECTRIC FUSE PLUG Filed Jan. 8, 1948 JNVEN TOR. inizi/JV JYZYZZJ? BY CM 'UQ/@w fyi/'TORNEI Patented Sept. 27, 1949 UNITED STATES PATENT OFFICE) RENEWAL ELECTRIC FUSE PLUG Evelyn Meltzer, Brooklyn, N. Y.

Application January 8, 1948, Serial No. 1,169

2 Claims. (Cl. ZOO-430) My invention relates to improvements in renewal or refillable fuse plugs.

The major object of my invention is to provide an electric fuse plug of such design and construction wherein it is possible for the layman to remove the ruptured or burned-out fuse element and to insert a new element with ease and without the need or use of any tools.

Other objects of my invention are to provide a renewal or rellable fuse plug which is simple of design and construction, is inexpensive to manufacture, eliminates screws, rivets, soldering and the like for the replacement of the fuse element, simplifies assembly, is efficient in operation, and meets the requirements of the Underwriters Code.

Another object of my invention is to provide a refillable fuse plug having such body design which simplifies the molding thereof and reduces mold costs, and especially lends itself to be cold molded from cold molding plastics.

For a better understanding of the invention, reference may be had to the following detailed description taken in connection with the drawing originally filed, in which Fig. 1 is a side elevational view of the refillable fuse plug embodying the features of the present invention.

Fig. 2 is a sectional View taken on line 2--2 of Fig. 1, with the fuse element in place.

Fig. 3 is a fragmentary sectional View illustrating the manner in which the fuse element is inserted into the plug parts to renew or refill the same.

Fig. 4 is a fragmentary traverse sectional view taken on line 4-4 of Fig. 2.

Fig. 5 is a perspective view of the fuse element.

Referring now to the figures, I represents the main section of the body of the plug and I2 represents the secondary section of the body of the plug. These two sections are held together by a threaded metallic sleeve II which serves to retain and make contact with one of the terminals of the fuse receptacle. The body sections IU and I2 are made from any electrical insulating material such as glass, porcelain, Bakelite etc., but preferably from cold molding plastic. I3 is a metallic spring like terminal bent hair-pin like at I and serves to grip and make contact with one end of the `fuse element I6. The terminal I3 may be made from flat or round spring wire but preferably from semiround bobby-pin wire. This terminal is held in position and secured between the parts I0 and I2. The terminal I3 connects with the threaded sleeve II through a soldered joint I4. The hairpin like formation I5 of the terminal I3 serves to receive and retain in spring pressed relationship a removable fuse element I 6. The said formation I5 eliminates the need of a screw or other means for securing the fuse element I6. The spring portion I5 springs outwardly to receive the element IS which is inserted through an opening I'I in the part I2. A tight contact is thereby obtained. The fuse element I6 is weakened at I8 and when an overload of current is applied to the fuse, the fuse element will be severed at I8. The upper end of the element I6 is secured in position by being bent over the upper end of part I2 as indicated at i9 and is extended into a slot 2li of the part designed to receive the bent end I9. The orifice in part I2 is closed by a contact metallic cap 2l which is screw threaded onto the part I2 and is adapted to bear downwardly upon the upper end of the bent over portion I9 of the element I6 and thereby makes a secure contact with the element I6. The cap 2| serves as the second terminal in contact with the fuse receptacle. The cap 2| can be easily removed by hand, without the need or use of tools, to release the portion of the fuse element I6 which is left after the same has been severed and the hole I'I provides access to remove other portions which may still be in union with the hairpin portion I5.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

Having thus set forth and disclosed the nature of my invention, what is claimed is:

1. A fuse plug of the class described, requiring no use of tools for the removal or for the replacement of the fuse element, comprising a body made up of two sections and having an opening in each section, said sections arranged to retain securely in position a wire terminal extended across the openings, a wire terminal adapted to receive and hold securely without the need of a screw or the like one end of a fuse element, a removable terminal engaging with the opposite end of the fuse element and adapted to have engagement with a fuse receptacle contact, said removable terminal comprising a threaded cap which may be removed by hand.

2. A fuse plug of the class described, requiring no use of tools for the removal or for the replacement of the fuse element, comprising a 3 body made up of two sections and having an opening in each section, said sections arranged to retain securely in position a Wire terminal extended across the openings, a wire terminal having a portion thereof bent hairpin like and adapted to receive and hold securely one end of a fuse element, a removable terminal engaging with the opposite end of the fuse element and adapted to have engagement with a fuse receptacle contact, sad removable terminal comprising a threaded cap which may be Vremoved by hand.

EVELYN MELTZER.

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

5 UNITED STATES PATENTS| Number Name Date 1,186,090 Hanson June 6, 1916 1,384,028 Baxter July 5, 1921 10 1,496,405 Begehr 1 June 3, 1924

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