US1800978A - Telephone protector - Google Patents

Description

April 14, 1931. J 3 BA ER 1,800,978

TELEPHONE PROTECTOR Filed April 24, 1929 Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE JOHN S. BAKER, OF CHICAGO, ILLINOIS, ASSIGNOR TO COOK ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS TELEPHONE PROTECTOR Application filed April 24,

My invention relates to terminal boxes and more particularly to sub-station protectors used particularly for telephone, telegraph or like systems.

The principal objects of my invention are to provide a terminal box which is compact, durable and simple in construction; to provide improved means in a terminal box for accommodating, distributing, and connecting 1 the conductors leading thereinto; to provide an improved mounting, preferably of porcelain, which permits minimum spacing of the terminals accommodating the conductors; to provide improved means for grounding the protective devices associated with a terminal box; and to provide improved means for assuring a grounded connection for the cover of a terminal box, this means acting also as a guide for the cover as it is placed in position over the terminal box.

Other objects and advantages willbe apparent from the following description when taken in connection with the accompanying drawings, in which:

Figure 1 is an elevation of a terminal box mounted in position; I

Fig. 2 is a front elevation of one side of the terminal box with the cover shown in dotted lines;

Fig. 3 is asimilar view of the opposite side of the terminal box;

Fig.4 is also asimilar view looking at the device from .another side; and 1 Fig. 5 is a cross-sectional view taken on 35 line 55 of Fig. 4.

The device illustrated in the drawing comprises a horizontal base 1 and a vertical wall 2 which may be integrally formed with the base and made of any suitable insulation material such as porcelain. Protective devices comprising suitable fuses '3 and lightning arresters 4 may be, if so desired, disposed on one side of vertical wall 2. The mounts for such protectivedevices comprise spring 46 conductors 5 for receiving the lower ends of fuses 3. These spring conductors have angularly extending arms 6 disposed against the flat surface of wall 2 and held in position by line terminals 7 and 8. Line terminals 7- and 8 may be of any suitable construction for protective devices and extending outwardly 1929. Serial No. 357,662.

receiving the usual line wires 9 and 10 entering the terminal box through openings 11 formed in base 1. Similar spring conductors 12 receive the upper ends of fuses 3 and are likewise held in position by their arms 13 which engage against wall 2 in proper relation with terminals 13 and 14 accommodating wires 15 and 16 leading to the subscribers line.

Vertical wall 2 may have its upper end formed with a recess 17 adapted to receive a plate 18 which, with arms 13, form a suitable recess for receiving lightning arresters 4. Plate 18 is preferably grounded by means of a rod 20 mounted on wall 2 between the from both sides. One end of rod 2 constitutes a terminal 21 for receiving a grounded wire 22. Grounded wire 22 together with subscribers wires 15 and 16 may leave the terminal box on the side opposite to the line wi res through openings 23 formed in base 1. While it is not essential, I prefer, however, to arrange the protective devices in parallel relation in order to secure compact and officient grouping. Rod 20 extends from one side of wall 2 between lightning arresters 4 and fuses 3. Rod 20 is grounded by ground wire 22 and consequently, a sleeve of insulation 25 is disposed on rod 20 between the fuses. To assist in securing compact arrangement of the live parts on wall 2 and the minimum spacing thereof, between opposite sides of the circuit, wall 2 is provided with a longitudinal slot 26 passing between the line terminals 7 and 8 and the subscribers termin als 13 and 14. Within predetermined limits, slot 26 prevents the current creeping across these terminals, and consequently, results in permitting these terminals to be spaced closer together on wall 2 than if the slot were omitted.

A suitable cover or enclosure 28 is placed over the whole to enclose the same. Rod 20 is extended far enough from opposite sides of wall 2 to contact with the sides of cover 28 as the cover is placed in position. Being grounded, rod 20 assures that the cover is at all times grounded because it is impossible for the cover to be in position without com 1 tacting at either end, or both ends, of the said wall, and a cover placed over the whole rod 20. Another advantage of the provision of rod in the form as shown herein is that the cover is guided as it is positioned over the device, thereby preventing accidental con-- tact thereof across the opposite terminals and at the same time assuring that the cover is grounded as soon as it is slipped into position. Cover 28 provides a substantially airtight enclosure for the terminal box. It extends downwardly and tightly fits about the periphery of base 2. The terminal box may be mounted in any suitable way, say

bv an angle bracket 30 adapted to be bolted 1 t6 base 1 at 31.

It is obvious to those skilled in the art that various detailchanges may be made in vthe arrangement of the parts carried by wall 2 without departing frointhe advantages obtained by the provision of grounded rod 20 for guiding and grounding cover 28 as it is placed in position and the provision of slot 26 in wall 2 for permitting closer or minimum spacing of the terminals and other live partsof the circuit.

' I claim: 7

1. A terminal box comprising a horizontal baseportion and a vertical wall preferably integral therewith and of insulation material, terminal posts at the upper and lower ends of said vertical wall, protective devices carried by said terminal posts on one side of vices mounted upon said wall, terminals at v opposite ends of said protective devices for receiving the incoming and outgoing cone ductor' connections, said wall having a recess therein, a grounded plate in said recess, lightning arresters disposed upon said wall in recessed relation against said grounded plate, a grounded terminal member connected to said plate, and a cover placed over the whole so as to enclose the same.

3; A terminal box comprising a base and 7 an upwardly extending wall of insulation material, protective devices mounted onone side of said wall, terminals at opposite ends of saidprotective devices for receiving the incoming and the outgoing conductor connections at the opposite sides respectively of said wall, said wall ha-ving therein a longi'-' tudinal slot between said terminals, to per-. .mit minimum, spacing. of said terminals on scribed my name.

so as to enclose the same.

4. A terminal box'comprising a base and a wall extending therefrom of insulation ma terial, protective devices carried by said wall, terminals at opposite ends of said protective devices for receiving conductor connections, said wall having therein a longitudinal slot between said terminals to permit minimum spacing of said terminals on said wall, and a cover placed over the whole so as to enclose the same. 7

5. A terminal box comprising a base and a wall extending therefrom of insulation material, protective devices and terminals therefor carried by said wall, said wall having therein a longitudinal slot between said terminals to permit minimum spacing of" said terminals on said wall, and a cover placed over the whole so as to enclose the same. 7 V

6. A terminal box comprising a wall, protective devices and terminals therefor carried by said wall, said protective devices including fuses, lightning arresters, and a groundedplate associated with said lightning arresters, a grounded terminal member connected to said plate and passing through and extending a distance therefrom on each side of said wall, and a cover placed over the whole so as to enclose the same, said-cover being grounded by substantially contsant contact with said grounded terminal member.

7. A cable terminal comprising amounted wall of insulation material, protective devices mounted upon said wall, terminals at opposite ends of said protective devices for receiving the incoming and outgoing con ductor connections, said wall having a recess at one end, a grounded plate in said recess and lightning a-rresters disposed upon said wall in recessed relation against said grounded plate and forming a part of the connections at one end between said protective devices and said terminals.

8. A terminal box comprising a wall, protective devices including fuses andlightning arresters carried by said wall, a cover placed over the whole so as to enclosethe same, and a grounded terminal member in grounded relation with said lightning arresters and extending from opposite s'idesi of said Wall to contact with and thereby ground said cover.

' 9; terminal box comprising a wall, protective devices carried by said wall, a grounded terminal member forQsaidprotective devices extending a distance therefrom oneach side of said wall, and a cover placed over the whole so as to enclose the same, said cover 7 being guided by and in grounded relation Wlljh sa1d grounded terminal member.

In witness whereof, I have hereunto sub- JOHN S. BAKER.

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