US809300A - Switch-plug with electrical fuse. - Google Patents

Description

PATENTED JAN. 9, 1906.

A, HEPKE 2 K. DIENER.

SWITCH PLUG WITH ELEGTRIGA L FUSE,

APPLIGATION FILED JULY 20,1904.

winawes: am 4 /f UNITED STATIES PATENT OFFICE.

SWITCH-PLUG WITH ELECTRICAL FUSE.

Specification of Letters Patent.

Patented Jan. 9,1906.

Application filed July 20, 1904. Serial No. 217,397.

.To all whom it ntcty concern:

Be it known that we, ALEXANDER HEPKE and KURT DIENER, subjects of the King of Prussia, German Emperor, and residents of Berlin, Kingdom of Prussia, German Empire, have jointly invented certain new and useful Improvements in Switch-Plugs with Electrical Fuses, of which the following is an exact specification.

Our invention relates to improvements in fuse-plugs for electric circuits, and more especially to fuse-plugs with several fuses to be used one after the other. In such plugs with several fuses hitherto constructed the fuses mostly were arranged in a special plug, by the turning or otherwise movement of which second plug or cylinder the different fuses were inserted in the circuit. -In such plugs the current-circuit is completed by contact springs, which cannot be prevented from being heated. Therefore the elasticity of the spring and the contact made are soon diminished, so that the fuse will not melt at the right moment.

According to the present invention the fuses are not fixed to a special cylinder or the like by the changing of the position of which the desired fuses are inserted, but are rigidly fixed in the plug.

In order to make our invention more clear, we refer to the accompanying drawings, in which 1 Figure 1 is a vertical section of a plug provided with two fuse-wires. Fig. 2 is partly a horizontal section and partly a plan of the plug after removal of the top plate. Figs. 3 and 4 are similar views of a modified construction.

In the drawings, Figs. 1 and 2, two fusewires 1 and 2 are provided within the plug body 20, which are in contact with a contactscrew 3. The upper ends of the wires 1 and 2 terminate in two contact-pieces 4 1, which are situated in a disk 5, manufactured of an insulating material, (glass, porcelain, or the like.) In the disk 5 two further contactpieces 6 and 6 are fixed, which by means of wires 7, advantageously embedded in gypsum or the like, are connected to the screw threaded metal shell 8, forming the contact with the plug-socket. Above the disk 5 a second disk 11, turnable around the axle 9, is situated, which disk is also manufactured of a fireproof insulating material. The disk 11 is provided with a metal plate 10, which is constructed so as to be capable of forming an electric connection between one of the two contact pairs 1 6 or 1 6. The disk 11 is pressed by means of springs or of an elastic cap 12 downward, so that the metal piece 10 is pressed upon the contact-pieces 4 6 or 4 6, respectively.

The axle 9 is fixed in a partition 13, separating the fuse-wires 1 and 2 from one another.

In the position shown in the drawings the metal strip 10 is situated upon the contactpieces 1 and 6, (shown on the left-hand side of the drawings.) If the plug is inserted in the socket, the electric current will flow from the contact-screw 3, through the fuse-wire 1, the contact-piece 4, the plate 10, the contact piece 6, and the wire 7 to the shell 8. If the fuse-wire 1 is molten, the disk 11 is turned, for which purpose it is advantageously provided with a handle 14. If by the turning of the disk 11 the metal piece 10 is situated upon the second contact-pieces 1 and 6, the fuse-wire 2 is inserted in the circuit, so that the current flows through this fuse-wire 2, from the contact-screw 3, to the shell 8.

It will be understood that instead of using two fuse-wires or strips 1 and 2 with the contact-pieces 4 6 or 1 6, connected to the same, several such fuse-wires may be arranged es pecially in case of large plugs, so that by turning the disk 11 after one of the wires being molten always the following wire can be inserted.

In the construction shown in Figs. 3 and 4 the insertion of a new wire is effected by pressing a pin downward. The fuse-wires 1 and 2 are separated again by a partition 13. The wire 1 is guided over this partition 13 and passes over the part of the casing in which the wire 2 is situated. The wire 1 is then fixed in the casing or plug-body 30 in any convenient manner. The second wire 2 is guided over a nose 19 and is then also fixed to the casing. In the plate 5 a metal socket 15 is fixed, which is connected by means of the wire 17 to the shell 8. In this socket the pin or plug 16 is situated. In the position shown in the drawings this. plug 16 pushes against the wire 1, so that the current flows through the contact-screw 3, the fuse-wire 1, the plug 16, the socket 15, and the wire 17 to the shell 8. As the plug 16 pushes against the wire 1, this plug cannot be pressed downward. If now the wire 1 is molten, the plug 16 can be shifted downward, so as to push against the wire 2. The wires 1 and 2 are situated so that their crossing-point is situated underneath the plug 16. By shifting the plug 16 downward after the fuse-wire 1 being molten the fuse-wire 2 is inserted.

It will be understood that instead of two fuse-wires three or more fuse-wires may be used, which can be inserted one after the other. By the fuse-wire which is inserted in the circuit, preventing the downward movement of the plug, it is impossible to bring several wires in contact with the plug 16. This is very important, as the current should always pass only through one of the fuse-wires, the di ameter of which is calculated for the current. Instead of the plug 16 a screw may be used.

The hollow spaces within the plug-body may be filled with sand, gypsum, or the like, so that a melting fuse cannot damage the other fuses. The fuses can also be connected in parallel.

Having thus fully described the nature of our invention and in what manner the same is to be performed, what we desire to secure by Letters Patent of the United States is 1. In a fuse-plug for electric circuits, the combination with an insulating plug-body, of two contact-bodies fixed to said plug-body, through which contact-bodies the current enters and leaves the plug, a plurality of fuses within said plug-body in fixed position to the same, and electrically connected with one of their ends to one of said contact-bodies, and a movable member for connecting seriatim the other ends of the fuses with the other contact-body, substantially as described and for the purpose set forth.

2. In a fuse-plug for electric circuits, the combination with an insulating plug-body, of two contact-bodies fixed to said plug-body, through which contact-bodies the current enters and leaves the plug, a plurality of fuses within said plug-body in fixed position to the same, and electrically connected with one of their ends to one of said contact-bodies, and a member movable around its axis for connecting seriatim the other ends of the fuses with the other contact-body, substantially as described and for the purpose set forth.

3. In a fuse-plug for electric circuits, the combination with an insulating plug-body, of two outside contact-bodies fixed to said plugbody, through which contact-bodies the current enters and leaves the plug, a plurality of fuses within said plug-body in fixed position to the same, and electrically connected with one of their ends to one of said contact-bodies, a plate of insulated material, pairs of contactpieces situated in saidv plate, one of the contact-pieces of each pair being electrically connected to the other end of one of the fuses, the other contact-piece of each pair being electrically connected to the second contact body, and means for electrically connecting in turn the contact-pieces of each pair to each other, substantially as described and for the purpose set forth.

4. In a fuse-plug for electric circuits, the combination with an insulating plug-body, of two outside contact-bodies fixed to said plugbody, through which contact-bodies the current enters and leaves the plug, a plurality of fuses within said plug-body in fixed position to the same, and electrically connected with one of their ends to one of said contact-bodies, a plate of insulated material, pairs of contactpieces situated in said plate, one of the con tact-pieces of each pair being electrically connected to the other end of one of the fuses, the other contact-piece of each pair being electrically connected to the second contactbody, a plate of insulating material with a metallic strip, and means for turning said insulated plate so as to electrically connect the two contactpieces of in turn each pair to each other, substantially as described and for the purpose set forth.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

- ALEXANDER IIEPKE.

KURT DIENER. I/Vitnesses:

HENRY HAsrER, WOLDEMAR HAUPT.

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