US1138857A - Combined switch and fuse. - Google Patents

Description

R. ELSMAN & C. DALLERUP. COMBINED SWITCH AND FUSE. APPLICATION FILED Aumo. ma.

'R. ELSMAN & c. 'DALLERUP COMBINED SWITCHAND FUSE. APPLICATION FILED AUG.20, 19x3.

Patented May 11, 1915.

. 2 SHEETS-SHEET 2.

ama/ 12) UNITED STATES PATENT" OFFICE.

BAILPH ELSMAN or sen FRANCISCO, AND cnannns DALLnRUr, or SAN meat,

camronma.

-QOMBINED SWITCH AND FUSE.

To all whom it may concern:

Be it known that we, Rgmrn ELSMAN and CHARLES DALLnnUPpcitizens of the. United States, residing, respectively, at San Fran cisco, in the county of San Francisco and State of California, and at San Rafael, in

the county of Marin and State of California, have invented new and useful Improvements in Combined Switches and Fuses, of which the following is a specification.

It is the object of the' present invention to provide a fuse supporting structure, suitable fpr use in-the protection of electrical circuits of high voltage and combining the fuse device with a switch mechanism, where by the fuse element may be entirelydisconnected from the line when it is to be replaced or adjusted. The structure is pref-- erably so constructed as to be adapted for interrupting a plurality of conductors simultaneously.v as for instance the three conductors of a poly-phase circuit and is of a construction easy to manufacture and install and well suited for use in the open air where the weather conditions are severe. By eliminating the fuses from'the structure, it may be converted into a simple sectionalizing switch, as hereinafter explained.

Other features and advantages will be come apparent from the following description, which is to be taken in conjunction with the drhwings, wherein Figure 1 is an elevation of the pole top cap 5 suitably attached, as by c'ementing,.

. or spinning in at the edges. Each of these caps carries a stud bolt, -provided with a wing nut 6'un der which anelectric conductonmay be clamped. This conductor may be connected with a high voltagetransmission line. Each metal cap 5 also carries a pair of spring clips 7 serving as switch contacts between which a blade is-inserted whenthe switch is closed.

Specification of Letters Patent.

The bolts 8 whereon each insulator 4 is mounted pass through the top cross arm 2 and also through the end of a metal strip or bracket 9, the lower end of which. is bolted to the lower cross arm and the intermediate portion of which is twisted around at right angles to the end portions so that the strip may serve as a bearing membrr'for the movable parts of the switch mechanism.

The switch mechanism comprises switching elements rigidly mounted on an operating shaft or rock shaft 10, which may be in the form of an iron pipe passed throughholes in the braces 9 and having a rotating motion with respect to those braces. This rock shaft is preferably provided with a rearwardly extending pipe 11. (See Fig.

Patented .May ll, T915. Application filed August 20, 1-913. Serial No. 785,660. 7 i

2) carrying a counter-weight l2 adjustable thereon and pivotally connected with a reach rod 13 of insulating material, as wood properly treated. It is by operating this reach bar up and down, that the switch and fuse mechanism may be thrown into or out of action. The reach bar 13 passes freely through a retaining strap 14 and 15 provided with a stop-plate 15 bent up at either end to strike against strap 14, thereby to limit the up and down movements of the reach bar. The lower end of the reach bar is provided with a hasn 16 and pad-lock so that the switches may be locked either open or closed as desired. It will be understood that the reach bar is long enough to be easily accessible when the operator is at a safe distance from the line wires, as for instance when-standing on the ground.

The switch mechanism in the particular embodiment here illustrated comprises three members carried by the rock shaft 10 and each made upof an arm 17 which may be iron tubing bent up at one end to form a support for an insulator 18, and rigidly attached at the other end, as by screw-threaded engagement and by clamping bolts, to a casting 19 rigidly attachedto the rock shaft 10 and also serving as a support for a nippleorpin 20, whereon a second insulator 21 is.

permanently mounted. Insulator .18 carries a metal cap 22 as shownin Fig. fl'cemented Jor spun into permanent relation therewith and tapped out to receive stud bolts 23 under which. is clamped the flattened end of'a switch arm 24, the upper end of which is slotted to receive a switch blade 25 adapted for insertion between the resilient 60 freeze I switch jaw clips 7 of the stationary insulator Cap 22 also carries a .stud bolt 26,

which, as shown in Fig. 4: is used for secur-1 ,ing' the clip '27 for the fuse. This clip may 5 be provided with .a retaining bolt 28 and in I accordance Wltll common practice is used to clip the upper end of a. removable fuse tube 29, wherein 1s inountcd a fuse adapted to blow and open up the circuit when a dangerous or abnormal current flows through the conductors 0 apparatus to be protected. The other end of the fuse tube is similarly clamped at the cap 30 of insulator 21 and that cap is provided with a stud'bolt having a wine; nut 31, whereby a conductor may be attached for connection to the circuit to be protected.

lVith the reach bar down as shown in Fig. 1 all three of the switch blades will be in contact with theirv clips 7 and current comingin to the insulators 4 will pass through. the switch hides and through the .fuses to the caps and thence on to the l0ad circuit. The potentials may be high,

25 higher, than eleven kilovolts and the load may boot the character so frequently found in the lVest. where alternating currentmotors'are used extensively for irrigation and reclamation purposes. In case of an abnor- 0 mal current through the device here shown.

operator may then thrust the wood reach bar upward, thereby swinging the rock shaft 10 and opening up the switches simultaneously and by a distance far enough to make it safe for the operator to then re 40 place the fuses and to otherwise make such examination and changes as may be necessary. By combining the fuse element with the switchelcment, the fuse retaining clip is swung outward away from the line conductors at the time theswitch is opened and all. manipulations necessary for the replacement of the fuse may be carried on at a safe distance from the live transmission conductors at the top of the pole. The fuse may consist of a glass tube provided with metal ferrules suitably attached to each end. the fuse wires being. attached to the ferrule in passing through the tube or other special fuses of'suitable. size and construction may be used.

The structure can be used. either indoors or butdoors and if they are for outdoor use, the bearing supports for the rock shaft are of such type that they will not rust or after being exposed to the Weather, under severe conditions. In the construction shown, the c oss arm which supports the line also supports the upper element of the switch and only one other cross arm is required, and the two cross arms are tied together in such a way that the entire structure is rigid and secure and perfect alinement of the switch elements is accurately maintained. The construction is cheap to build and to. assemble and is rugged in character and the several parts are easily replaceable in case of accident.

If for any reason, the fuse protection is not needed. the fuses and their supporting clips may be removed and a piece of ship copper may be bolted on in place of the fuse, between the fuse caps, and the device then becomes a line sectionalizing switch, serviceable in usual. manner and yet reconyertible into "a fuse protective device if the need arises.

Although we have herein shown and described one embodiment of our invention, changes and modifications may be made therein without departing from thcscope of the invention as defined by the appended claims.

. o claim 1.. A combined fuse and switch for use at the top of a pole comprising an upper wrod cross arm. stationary clips supported thereon and forming circuit terminals for h-gh voltage line conductors, another wood closs arm on said pole, braces connecting said cross arms to form a rigid structure, a rock .shaft carried by said braces and a plurality of switch. elements supported by said rock shaft and swinging therewith away from said pole and out of operative connection with said hi gh voltage stationary clips, each of said swinging switch elements including a replaceable fuse.

.2. In an electric switch mechanism, the

combination with a tubular rock shaft, a

counterweig'hted arm rigidly connected therewith, an insulating push bar operati vely connected to said arm to swing said shaft, stationary clips supported above said shaft on a wood cross arm and adapted for connection with high voltage conductors, and swinging members clamped to said shaft and swinging therewith into and out of operative connection with said' clips. each of said members comprising'a. pair of insulators spaced the topmost of said insulators carrying a apart and bridged by a fuse,

switch arm connected with the fuse andmovable therewith into .or out of contact with the stationary clip and the lowermost insulator having means for permanent attachment to a conductor to be protected by said fuse.

3. In a combined fuse and switch for high voltage electric circuits, the combination of a pair of wood cross arms spaced apart at the top of a transmission line pole andconnected by three metal strips bolted thereto to form arigid structm'c. insulators carried by the topmost arm and bearing stationary clips projecting away from said pole and adapted nal of the top cross arm,

to form the circuit terminals ofa high voltage line,

sa1d metal strlps, a ccuntcrwelghted arm a rock shaft pivotally" mounted in rigidl connected to said shaft, aninsnlated push rod connected to said counter-weighted arm to swing said rock shaft in its-bearings, and switch memberssupported by said rock shaft and swinging therewith toward the pole to engage said clips, each of said members comprising an arm carrying a pair of insulators spaced apart and bridged by a re newable fuse, one of said insulators carrying a switch arm movable therewith into and out of contact with a stationarytermisubstantially as described. y

-'l. In an electrical switch mechanism for use on the top of a pole, the combination of a plurality of stationary terminals adapted for connection with dnctors, a tubular rock shaft, a counterweighted arm connected therewith, a reach bar connected with said arm for controlling means of its reach bar.

high. voltage line 0011- the position of said rock shaft from the base of the pole, means for locking said rock shaft in desired position, and a plurality of switch elements carried by said rock shaft and mot able therewith into and out of operative connection with said high voltage terswung upward toward the topvof the pole by ,In Witness whereof, We hereunto subscribe our names this 31 day of May, A. D; 1913.

RALPH ELSMAN. v v CHAS. DALLERUP. Witnesses: v R. J. CANTRELL,

Enw. S. BATTLES.

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