US1437906A - Multiple-fuse plug - Google Patents

Description

B. L, MOSS AND J. SCHURY.

MULTIPLE FUSE PLUG.

APPLICATION FILED DEC. 27. 1919.

Patented Dec. 5, 1922.

' vertical section. Fig. 5 is a section on the Patented Dec. 5, 1922 UNITED STATES BENJAMIN L. MOSS AND JOHN SCHURY, OF DETROIT, MICHIGAN.

MULTIPLE-FUSE PLUG.

Application filed December 27, 1919. Serial No. 347,746.

To all whom it may concern:

Be it known that we, BENJAMIN L. Moss, a citizen of the United States, and JOHN SoHURY, a subject of the Government of Austria, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Multiple-F use Plugs, of which the following is a specification.

In our'pending application No. 333,957 there is disclosed a fuse plug of that type used in connection with electric light sockets or the like, there being a plurality of fuses which are successively brought into operative position, so that when one fuse. blows, another may be connected, the successive connections being made by turning a central block which carries the fuses.

The object of the present invention is to improve the fuse plug disclosed in said application, particularly with respect to the construction of the fusible member, and with respect to other features as will more. fully appear from the following description.

The invention is illustrated in the accompanying drawing in which Fig. 1 is a side elevation of the plug. Fig. 2 is a side elevation of the block or member which is r0- tatable within the casing or outer part of the plug. Fig. 3 is a top view of the casing with the plug removed. Fig. 4 is a central line 55 of Fig. 4. Fig. 6 is a plan of the fuse element before it is bent to final shape.

The plug comprises an outer casing or cylindrical member 6 having an enlarged upper part 7. This is made of porcelain,

fiber, or other insulating material, and is.

provided externally with a threaded conducting shell 8, which screws into the ordinary socket, not shown. The plug is closed at the inner end and is provided with a central contact pin 30 fitting snugly in an 0 ening in the mner end of the casing. he shell 8 is electrically connected by a metal strip 22 to a contact spring and detent 23 which projects into the bore or hollow part of the casing.

Fitting within; the casing, in such manner that it may be turned therein, is a circular block 9, made of insulating material, and the exterior of this block is provided .with a plurality of equally spaced longitudinal grooves 10, each of which receives one of the arms 11 of a multiple fuse member conveniently made of sheet metal, the

arms radiating in the blank, from a central circular part 12, as shown in Fig. 6. When this member is assembled on the block, the central part 12 fits in a recess in the inner end of the block, and each of the arms is bent up to he within one of the grooves 10 in the side of the block, and when the block is assembled in the casing the central part 12 is in contact with the upper end of the pin 30 and so makes electrical connection between said arms and the central contact of the plug. Each of the arms 11 is reduced in width, as indicated at 11a, to make a weakened neck portion, which may be varled according to the desired or intended capacity of the fuse.

The outer ends 15 of the arms 11 form contact plates or portions, each of which rests in a ratchet notch or depression v16 formed in the rim 17 of the block 9, and thls rim fits and turns in an annular channel or depression 16 in the top of the casing. Above the notched rim the block 9 has a flange 19 which rests against a shoulder 20 in the top of the casing, and the block 9 is also provided with a finger piece 21 which may be grasped to turn the block to bring the successive fusible arms into the circuit. A cap 24 is screwed on the top of the plug and has an opening through which the finger piece 21 projects.

When the block 1s assembled in the casing the end 15 .of one of the arms is in contact with the finger 23, and the circuit may be traced from the shell 8 through the connection 22 to the spring contact 23, the contact-15, arm 11, plate 12 to the central contact pin or stud 30.

In use, if the connected fuse blows, it is merely necessary to turn the block 9 until the spring piece 23 snaps into the next notch 16 into connection with the plate 15 and next arm 11, thereby connecting a newfusible arm in the circuit; and so the block may be turned to bring successive fuses into osition as fast as they burn out. When all t e arms are fused the cap 24 may be taken off and the block 9 lifted out and a new fuse plate substituted. By making all the fuses from a. single blank or piece the construction is cheapened and all soldering is avoided;

We claim 1. In amultiple successive fuse plug, the

combination with a casing having a contact, of a rotatable block in the casing having i and an outer shell contact, of an externally grooved block rotatable in the casing, and

a contact member carried by the block, said member having a central part at the inner end of the block and in contact with said pin and a plurality of integral fusible arms 20 located in the grooves and having reduced necks adjacent said chamber. said arms adapted to be successively closed upon said shell contact by turning the block.

In testimony whereof, we hereby aifix our 25 signatures in presence of two witnesses.

BENJAMIN L. MOSS. JOHN SOHURY. Q

Witnesses CHARLES W. TANN, IDA 'HAGEN.

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