US718632A - Electrical fuse or junction box. - Google Patents

Description

No. 718,632. PATEN'IED JAN. 2.0, 1903.` M. H. JOHNSON. ELECTRICAL FUSE 0R JUNCTION BOX.

APPLICATION FILED MAY 31, 1902. x0 MODEL.

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TENT

ELECTRICAL FUSE OR'JUNCTION BOX.

SPECIFICATION forming part of Letters Patent No. 718,632, dated January 20, 1903.

Application filed May 31, 1902. Serial No. 109,650. (No model.)

To LZZ whom, it wtf/.y concern:

Beit known that I, MONTGOMERYH. JOHN- SON, of Utica, in the county of Oneida and State of New York, have invented certain new and useful Improvements in Electrical Junction or Fuse Boxes; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the iigures of reference marked thereon, which form part of this specification.

The object of my present invention is to provide an improved junction or fuse box of that class which are adapted to be placed in the walls of a building and in which the movable, delicate, and visible parts are readily removable and may be removed while the box or casing is being placed in the wall in the construction of a building.

By means of my invention a fuse or junction box is provided in which the above results are attained, and which is simple and strong in its construction and in which the electrical connections are surely and perfectly made when the parts are completely assembled.

In the drawings, Figurel shows a cross-section, on an enlarged scale, taken on line A B of Fig. 2,0f myimproved junction-box. Fig. 2 shows a plan view of the construction, except as to a small. portion of the tablet, which is broken out. In this figure the cover is shown removed.

Referring to the reference figures in a more particular description, 1 indicates the bottom, and 2 the side walls, of the outer box or casing. The bottom of the box is provided with an insulating lining-piece 3, and the side Walls of the lower portion are provided with insulating lining-pieces 4 4. Inlet and outlet openings for conductors are provided in suitable numbers into the bottom portion of the box, and these openings are preferably provided with insulating tubes or bushings, as 5. Asuitable number of circuit-terminals 6 are provided. These are of a Z-shaped form and secured to the lining 4 by a screw or bolt 7, with the lower arm projecting toward the center of the box and the upper arm overlying the edge of the liningpiece 4. branch circuits are attached, by a screw or other suitable means, to the lower arm of the terminal pieces 6. The removable tablet 9, of insulating material, is mounted on the edges of the lining-pieces 4, or, more properly, on the overhanging arm or branch of the circuit-terminal 6, and is secured in place by the screws 10. It is further secured in place by the upper or outer lining-pieces 11. The end construction of the box is similar to the side constructions described, except, preferably, that the main circuits (indicated by a. b) are brought into the end of the box through a construction similar to that described for the branch circuits, and particular description of these may be omitted. The main circuits connect with the bus-bars 12 13, arranged on the under side of the tablet 9.

On the face of the tablet 9 are arranged switches, fuse-wire, and distributing connections in suitable numbers. These are connected up between the bus-bars and the terminals 6, as follows: The screw 10, as well as securing the tablet in place, also connects the tablet-terminal 14C with the casing-terminal 6. On one end of the tablet-terminal is provided a binding-screw 15, which secures one end of the fuse-wire 16. The other end of the fuse-wire is secured by a binding-screw 17 in an electrical connection with the contact-pieces 16 of the switch. The opening and closing switch-blade 19 is adapted to establish connection between the switch-con tacts 18 and the fulcrum pieces 20. The switch blades are preferably arranged in pairs, secured to a cross-bar 21, and provided with a handle 22, by means of which the switches are manually operated. The switch fnlcrum-piece 20 (shown on the right-hand side of Fig. 1) is put in electrical connection with the bus-bar 12 by a cross strap 23. The next adjacent pivotal mounting 20, preferably of the same pair of blades, connects directly with the bus-bars 13 through the medium of screws passing through the tablet and engaging the bus-bar. A section taken on line O D of Fig. 2 would show exactly the reverse of the arrangement shown in Fig. 1 of the drawings. Between the section of busbar, as 13, which is opposite the switchmounting 20, not in electrical connection The Wires or conductors 8 of the IOO therewith, there is preferablyinserted apiece of mica 24, which more certainly interrupts or prevents electrical currents jumping the space and passing from the bus-bar to the screws 25 and 2G, which secure this mounting on the tablet.

While the rough building-work is going on, the tablet 9, together with the mechanism and devices mounted thereon and the liningpieces l1, all of which are usually highly finished, are removed from the casing. The electrical connections in the lower part of the box can be adjusted, manipulated, and arranged when the tablet is removed. The final assembling of the box is a very simple matter, simply requiring the placing of the tablet in position and placing and tightening the screws 10, which secure the tablet and establish the electrical connections. In addition to this the lining-pieces ll ot' course have to be inserted.

The box Or casing is provided with a cover 30, which is preferably provided with aglass panel 3l.

What I claim as new, and desire to secure by Letters Patent, is

l. The combination in a fuse or junction box of an outer box or casing, a lining for the bottom and lower portion of the box, openings for electrical conductors into the said lower portion, ixed terminal pieces secured in said lower portion of box, a removable tablet carrying the electrical4 distributing or other mechanism mounted on said tablet with circuit-terminals juxtaposed with the casingterminals and screws engaging said tablet and casing-terminals electrically connecting them and securing the tablet in position, substantially as set forth.

2. The combination in a fuse or junction box of an outer box or casing, a lining for the bottom and lower portion of the box, conductor-openings through the sides into said bottom portion of box, fixed circuit-terminals secured in said lower portion of box, a removable tablet of insulating material substantially litting the outer box or casing and mounted on the edge of the lining of said lower portion of box, electrical distributing or other apparatus mounted on said tablet having circuit-terminals juxtaposed with the box or casing-terminals, means for detachably connecting the tablet and casing-terminals and means for securing said tablet within the box or casing, substantially as set forth.

In witness whereof I have aflixed my signature, in presence of two witnesses, this 27th day of May, 1902.

MONTGOMERY H. JOHNSON.

XVitnesses:

S. I. DE VINE, S. R. BROWN.

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