US1473960A - Throw-off or circuit-breaking switch for skeet heads - Google Patents

Description

Nov. 13 1923.

'T. F. JOHNSON, JR

THROW-0FF OR CIRCUIT BREAKING SWITCH FOR SKEET HEADS Original Filed May 13 1920 2 Sheets-Sheet 1 7 .1 170/0260; r if,

INVENTOR WITNESSES ATTOR N EY Nov. 13 1923.

- 1,473,960 T. F. JOHNSON. JR

THROW-OFF OR CIRCUIT BREAKING SWITCH FOR sKEE r HEADS Original Filed May 13 1920 2 Sheets-Sheet 2 IFJohmofl, J 3

v INVE WITNESSES I WM ATTO RN EY son, Jr., a citizen of the United States, resid- Patented Nov. 13, 1923.

PATENT OFFICEL ro unrnson ron'r JoHNsoN, Ja, or ATLANTA, enonera.

THROW OFI OR CIRCUIT-BREAKING SWITCH FOR SKEET HEADS.

Application filed May 13, 1920, Serial -No.- 381,135. Renewed May 2, 1923.

To all whom it may concern:

Be 1t known that I, TOMLINSON F. JOHN- ing at Atlanta, in the county of Fulton and State of Georgia, have invented a new and useful Throw-Off or Circuit-Breaking Switch forSkeet Heads, of which the following is a specification.

This invention refers to throw-off or circult breaking switches particularly adapted for use on high tension transmission lines for maintaining; the continuity ofthe circuit under normal conditions but causing the breaking of the circuiton the passage of abnormally high tension or heavy currents to thereby protect translating devices fed by the transmission line or lines.

The object of the invention is to provide an electro-Inagneticdevice which, under normal conditions, maintains the circuit closed but, 011 the )assage of an abnormal current liable to do injuryto the translating devices, the circuit is ruptured and can only be re stored by an attendant.

Theinvention is susceptible of many cliffercnt embodiments of which but one is shown.

In accordance withthe invention the transmission line is assumed to feed translating devices in the form of transformers. The

- transmission line is assumed to be an overan electrojmagnetic release responsive to a bniostpiito.

Y By the term skeet head is meant a structure,

such as defined 1n this e; se for breaking the 1 circuit, because of the peculiar tone then emitted, simulating the high pitch tone of a. Tliis term has bcwme. known commercially by such name; which has become recognized in the commercial art where the structure is in use. The circuit breaker is mounted on top of thecolumn of insulating materialv and includes a spring actuated circuit breaker, under the control of normal currents, so that on an abnormal rise inelectrical pressure the circuit is ruptured and the translating device fed thereby is thus protected. i

' The invention is intended for-high tension long distance transmission lines Where the voltage may reach from 60,000 to 110,QOO

volts, or even higher, but should a super-- hlgh tension be mposed upon the mam line the electro-magnetic device will be energized andrthe circuit to the transformer will be,

broken, thus protecting the latter. The circuit remains broken until purposely restored by an attendant.

The invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming part of this specification, with the understanding, however, that the invention is not confined to any strict conformity with the showing in the drawings, but may be changed and modified so long as such changes and modifica tions mark no material departure from the salient features of the invention as expressed in the appended claims.

In the drawings:

Fig. l is a more or less diagrammatic View of the installation equipped withthe invention.

Fig. 2 is a detailed view on a larger scale than Fig. l, and also partly in section, showing a skeet head arrangement.

F 3 a view similar to Fig. 2 except that the locking means in thobranch conductor from the main conductor isshown-in the tln-own position. i

Referring to tl edrawings there is shown in Fig. 1 a main line conductor 1 which may be considered as teri'ninating at a pole 2 to which the main line conductor is mechanicallyconncctedthrough a string of insulators 3, such arrangement being the usual practice.

Connected to the main line conductor 1 is a branch conductor 4 of a flexible nature passingover a roller mounted in a block 6 fast on and supported by the conductor 1. The branch conductor 4. is mechanically and directly connected to the conductor 1 by clips '7. Al the end, of the conduc or 1] emote from the clips l is a terminal 8.

There is also provided. an. elec former 9 of suitable type, w fem which ri a post 11 which may be f, .ned of l .ies of nested and. connected insulators l2 of a character common in high tens on electric transmission lines. Usually the transmission systems are made up of a plurality of transmission conductors l, with an equalnumber of transformers 9, but, as this particular arrangement is not material to the invention, but one transmission. line lit) 1 and one transformer 9 are shown in the drawings.

On top of post 11 there is an insulating member 13 carried by a conducting collar let on the uppermost one of the insulators Rising from the insulating member 13 there is a fork or yoke 15 from one side of which there projects a shelf or bracket 16 on which there is mounted an clectro-magnet 17. The electro-magnet is provided. with an arma ture carried by an arm 18 pivotally connected to one leg of the yoke 15, the arm 18 being under the influence of a spring 19 tending to move it away from the magnet 17.

Formed through the terminal portions of the legs of the yoke 15 are alined passages 20 indicated in dotted lines. Adapted to the passages 20 is a rod or bar 21 long enough to span the space between the legs of the yoke and enter both passages and also to project for an appropriate distance beyond that side of the yoke carrying the armature arm 18. Mounted on the rod 21 is a sleeve 22 made fast to the rod by a lock nut 23 and extending into the sleeve 22 is an expansion spring 24; of a length to reach to an adjacent leg of theyoke 15, with the spring sufiiciently open when uncompressed to force the sleeve 22 away from the yoke 15, thereby carrying the rod 21 from traversing relation to the yoke 15. The armature arm 18 is in the nature of a latch, being provided with a nose 25 adapted to engage a coacting member 26 on the sleeve 22.

lVhen the parts are properly set current from the main line 1 passes by way of the conductor 4 and terminal 8 to the rod 21 and thus by way of the yoke 15 through the interior of the column 11 to the transformer 9, this last named arrangement being common to installations of the character to which the invention relates and hence needs no special, illustration or description.

The elcctro-magnet 17 is fed by conductors 27, 28, one being connected to the yoke 15 and the other to the collar 14, forming a path which may be in series to the main course of current through the device to the transformer 9.

iVhen the parts are properly set and cur rent is passing, the energy developed by the magnet 17 is insuflicient to draw the armature arm 18 toward the magnet 1'? so to. the member 26 is held by the nose 25 in such manner as to maintain the rod 21 in holding relation to the terminal 8. If, now, an abnormal current should occur on the main line it will pass through the trans-- former 9, but before any harm can come to the transformer the super-current passing through the electro-magnet 17 causes the movement of the latch nose 25 out of the path of the companion member 26, thereby releasing the spring 2 1 to action and causing it to move the rod 21 to a sufiicient extent to release the terminal 8.

The conductor 41 is under a normal strain because of the presence ot the weight 29 pendantly carried by a roller sustained by a portion of the conductor 1 between the clips 7 and the roller 5. As soon as the terminal 8 is released the weight 29 acts to move the terminal 8 toward the block 6 well away from the skeet head and far beyond flashing distance from the rod 21, wherefore, when the circuit breaker is opened there is no possibility of producing an arc.

This invention has features in common with my application No. 381,134:, for a throw-oft circuit breaking switch for skeet heads. filed May 13, 1920; and my application No. 361,526, for automatic circuit breaker attachment for high tension electric installation, tiled February 26, 1920.

lVhat is claimed is:

1. The herein described circuit breakin means for installation between an overhead high tension transmission line and a translating device located at a lower level, comprising a terminal adapted to be suspended from the transmission line by a flexible conductor, a. slidable rod having a normal tendency in one direction and adapted to engage said terminal, a support for the rod, and an electro-magnetically operated means for holding the rod in opposition to its normal tendency and responsive to abnormal currents on the transmission line to cause the release of the rod and the consequent escape of theterminal to thereby cause the breaking of the circuit.

2. The herein described circuit breaking means for installation between an overhead high tension transmission line and a translating device, comprising a terminal. adapted to be suspended from a flexible conductor, a slidable member adapted to be carried by the translating device and provided with means for imparting to it a normal tendency to move in one direction, said terminal being constructed to be traversed by the said slid able member, and an electro-magnetically operated latch. for holding the slidable member against its normal tendency thereby holding said. terminal in position. to maintain the circuit closed, said electromagnetically operated latch being inoperative to normal. currents and responsive to abnormal currents on the line.

3. The herein described circuit breaking means for installation between a high tension transmission line and a translating device, comprising a yoke adapted to be mounted on the translating device and provided with legs for inclusion in the circuit thereto, a rod adapted to traverse the legs of the yoke, a terminal adapted to be carried by a flexible conductor and constructed to be traversed by said rod, electromagnetic electromagnetic means on the passage of means carried by the yoke and supplied with an abnormal current therethrough to release current from the main line through the the rod to its normal tendency. flexible conductor, means for imparting to In testimony, that I claim the forevoing 5 the rod a normal tendency to move toward as my own, I have hereto aflixed my s1gnaone position to release the terminal, and a, ture.

latch responsive to energy developed in the TOMLINSON FORT JOHNSON, JR.

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