US2311092A - Repeating cutout construction - Google Patents

Description

Feb. 16, 1943. w Q SCHULTZ EI-AL 2,311,092

REPEATING CUTOUT CONSTRUCTION Filed Aug. 3, 1940 4 Sheets-Sheet 1 INVENTORS Mum/w 0. Jaw/1 rz BY 6 mm 6. Jaw/m V5? Feb. 16, 1943. w. o. SCHULTZ ETAL REPEATING CUTOUT CONSTRUCTION Filed Aug. 3, 1940 4 Sheets-Sheet 3 INVENTORS 0/4/14 0. Jae 0172 flaw/v 6. JffM/MAYEP zzzw flZ Feb. 16, 1943. w. o. SCHULTZ EI'AL REPEATING CUTOUT CONSTRUCTION Filed Aug. 3, 1940 4 Sheets-Sheet 4 mvmons Mum/M O. Jam/z rz ORNEY? Patented Feb. 16, 1943 REPEATING CUTOUT CONSTRUCTION William 0. Schultz, South Milwaukee, and Alwin G. Steinmayer, Milwaukee, Wis., assignors to Line Material Company, South Milwaukee, Wis., a corporation of Delaware Application August 3, 1940, Serial No. 350,994

Claims.

This invention relates to a repeating cut-out construction.

Objects of this invention are to provide a novel form of repeating cut-out, such as a repeating fuse for example, which is so made that when a fuse link is ruptured, a wide separation of the parts is automatically obtained and in which a successive fuse unit or cut-out is automatically placed in circuit after a predetermined interval of time.

Further objects are to provide a repeating fuse construction in which pairs of outwardly projecting arms are carried adjacent opposite ends of an elongated insulator and are so arranged that one arm of each pair is movable outwardly away from the other arm of the corresponding pair, a fuse link being normally interposed between the arms of the respective pairs, and to provide a novel form of time delay mechanism which delays the outward motion of one of the arms, which is adjustable as to the extent of the time delay and which allows the arm delayed by the time delay mechanism to execute the initial portion of its stroke very quickly, which thereafter delays an intermediate portion of its stroke, and which finally releases the arm and allows a quick final stroke, the latter part of its stroke serving to close the circuit to the next fuse.

Further objects are to provide a novel reclosing .switch construction in which an auxiliary switch is provided and is actuated upon motion of the delayed arm hereinabove mentioned, in which this auxiliary switch is so made that it has a quick closing stroke after an interval of time has elapsed following blowing of the fuse link, in which the auxiliary switch will automatically close itself after it has passed a certain point in its closing stroke, in which the movable arm is operatively associated with the auxiliary switch to initiate the closing motion of the auxiliary switch after an interval of time but which is inoperatively associated with the auxiliary switch after the auxiliary switch has closed so that the delayed arm may be restored to its operative position during refusing without opening the auxiliary switch, thereby preventing opening of the circuit until the auxiliary switch is moved to open position.

Further objects are to provide a novel manner of supporting the time delay mechanism in a relatively small housing so that it i adequately protected from the weather and also to provide adjusting means for adjusting the time delay interval, such adjusting means being accessible exteriorly of the housing of the time delay means.

Further objects are to provide a novel construction of fuse link which is so made that the fuse link is housed in a fiber-lined insulating tube, such for example as a phenolic condensation product, in which means are provided for sealing the tube at both ends so that the tube may be used with either end uppermost without danger of water entering the tube, and specifically to provide a weather seal for the end of the tube which will be open upon blowing of the fuse link, the weather seal being spring pressed towards tube closing position as long as the fuse link is intact.

Further objects are to provide a novel form of repeating fuse construction which may be mounted on a suitable support or which may be mounted on a terminal of a transformer and may be bodily supported thereby, the device being readily changed from one type of construction to the other by merely interchanging a small portion of the time delay housing, the other parts of the apparatus remaining unchanged.

Further objects are to provide a repeating cutout construction in which leakage is prevented and a long surface path is interposed between the active elements, in which the arc is confined to a definite point preferably in an enclosing casing provided with an arc extinguishing inner surface, and in which actual fusing takes place at a point spaced a material distance from any portion of the insulating body so that there i no chance of the formation of a conducting film on the insulating body due to volatilization of the fusible element.

Further objects are to provide a construction which may be very easily refused by means of a switch stick or similar instrument without having the lineman contact or handle any live portion of the apparatus during this refusing operation.

Embodiments of the invention are shown in the accompanying drawings, in which:

Figure l is an elevation of one form of the invention showing the parts in full lines in 0perative position and showing in dotted lines one of the fuse devices in inoperative position.

Figure 2 is a further view of the form of invention shown in Figure 1, such view being taken at from that of Figure 1 and showing one of the devices in inoperative position with the auxil iary switch in closed position.

Figure 3 is a sectional view on the line 3-3 of Figure 2.

Figure 4 is a fragmentary view illustrating the manner in which the auxiliary switch cooperates with the stationary portion of the apparatus for imparting a quick final stroke to the auxiliary switch.

Figure 5 is an enlarged sectional detail of the lower portion of the apparatus as shown in Figure 1, such view being partly in section.

Figure 6 is a sectional view on the line 6-5 of Figure 5.

Figure 7 is a view of a further form of the invention.

Figure 8 is a view of the fuse link, such view being partly in section.

Figure 9 is a fragmentary sectional view of a further form of fuse link.

Referring to the drawings, it will be seen that the device comprises an elongated insulator I which is provided with a plurality of petticoats and with a cylindrical intermediate portion 2 which may be held by an outwardly projecting arm 3 from a suitable support. This insulator is provided with an upper terminal 4. This upper terminal may be provided with a projecting portion 5 to which a conductor, not shown, may be attached by means of a suitable connector 6. The terminal I is also provided with a pair of outwardly projecting rigid arms I and 8 which terminate in inwardly turned hook-shaped portions 9 and 28 having substantially conical interior surfaces adapted to receive the conical portion of fuse links hereinafter described. The terminal 4 may also be provided with an upwardly projecting eyeleted portion I to which the incoming line wire maybe tied.

The lower portion of the insulator carries a lower casing member or terminal member II which takes the form of a housing for the time delay mechanism hereinafter described. This lower terminal ll may have a downwardly projecting portion l2 which is adapted to have a conductor, not shown, attached thereto by means of a suitable connector l3. The terminal l|,'as stated, constitutes a housing or casing for the time delay means and the lower portion of the housing or termianl member II is in the form of a removable bottom cover plate ll with which the conductor receiving portion I2 is integral in the form shown in Figures 1, 2 and 5.

A transversely extending shaft 15 is revolubly mounted in the housing or terminal member II, as most clearly shown in Figures and 6. This revolubly mounted shaft is spring urged in a clockwise direction as viewed in Figures 1 and 5, by means of a spring 15 loosely coiled around the shaft and having one end bearing against the interior of the casing or terminal member H, see Figure 5, and the other end bearing against the yoke portion of a U-shaped casting or member II. This member I1 is provided with a pair of spaced arms which carry a transversely extending pin l8, see Figure 5, the pin being operatively connected to the time delay mechanism as will hereinafter appear.

The revolubly mounted shaft I5 projects outwardly of the housing or terminal member I l and carries the spaced arms 13 of the movable arm portion 20, see Figures 1, 3 and 5. The movable arm 20 is therefore biased towards clockwise rocking motion as viewed in Figure 1 and tends to move away from the fixed arm I. The outer end of the arm 20 is provided'with a casting or fuse receiving hook like portion 2| which is rigid and which has a conical interior surface adapted to receive a corresponding approximately 'conically shaped portion of the fuse link.

The arm 20 may be formed of a single piece of rod or wire like metal which is provided with a U-shaped rear portion 22.

The rear portion 22 is also provided with a pair of spaced arms 23 which-are approximately parallel as shown most clearly in Figure 6. The

the portion 2| previously described. The corresponding arm 8, see Figure 2, is also provided with an inwardly opening hook-shaped portion 28 corresponding to the portion 9, see Figure 1.

The arm 26 is formed of resilient material and has a portion provided with spaced arms 29 which have coiled portions 30 which are integral with a rear U-shaped portion 3| clamped to the intermediate terminal 25.

The intermediate terminal 25 is provided with integral stationary switch contact members 32, see Fgures 1, 2 and 3. These contact members 32 are bevelled on their inner and outer sides as shown most clearly in Figure 3. The outer tapered sides are adapted to be engaged by the rear parallel portions 23 of the lower arm 20. The inner tapered sides are adapted to be engaged by the parallel portions of a resilient auxiliary switch or transfer switch 33, as shown in Figure 2.

The auxiliary switch 33 is provided with a pair of inwardly turned prongs 34, see Figures 2-and 5, and these inwardly turned prongs constitute pivot members for the auxiliary switch 33. They are received in a transverse aperture formed in a lug 35 integral with the lower terminal H, see Figures 1 and 5. The lug 35 extends rearwardly and is provided with a pair of parallel faces 36 and with shouldered portions 31 and with tapered portions 38.

It is apparent from the construction just described that when the auxiliary switch 33 is in its open position as shown in Figures 1 and 5, that the side arms thereof will frictionally engage the parallel surfaces 36, see Figures 1 and 5. The auxiliary switch 33 is formed oi resilient material and the side arms thereof attempt to approach each other and consequently will frictionally grip the flat or parallel faces 35 when the auxiliary switch 33 is in open position. This auxiliary switch is adapted to be moved by the transverse portion 22 of the time delayed lower arm 20, see Figure 1.

When the fuse link blows and releases the arm 20, see Figure 1, the portion 22 rocks along the arc indicated at 39 and engages the auxiliary switch 33 after an interval of time has elapsed as shown in dotted lines in Figures 1 and 5 and in full lines in Figures 2 and 3.

The time delay mechanism hereinafter described has no restraint on the final portion of the rocking stroke of the arm and consequently the normally parallel portions 23, see Figure 6, will rock upwardly to the dotted line position shown in Figure 5 to the full line position shown in Figure 2 and will make a final quick closing stroke and will engage the outer side of the stationary contacts 32, the auxiliary switch 33 having previously engaged the inner side of the eta; tionary contacts 32.

This transfers the circuit to the next fuse link, namely, to the arm 25, so that the next fuse indicated generally at 24 in Figures 1 and 2 is placed in circuit. The fuse 24' may be identically like the fuse 24 and is so illustrated, or it may be a different type. It is preferable, however, to have the two fuses 24 and 24' of the same type.

If the overload has ceased, nothing further happens, but if the overload continues, the fuse 24' will blow and the arm 26 will move downwardly due to its resiliency and will thus open the circuit, by rupturing of the fuse link and separation of its ends.

The fuse link may consist of a sleeve of a phenolic condensation product or other insulating sleeve 4| which is provided with a fiber sleeve liner 42, see Figure 8. The upper end of this sleeve 4| is closed by means of -the upper metal fitting or cap 43 which frictionally engages the outer side of the tube 4|. The fusible wire is indicated at 44 and the strain wire at 45. These may be of the usual types. Their upper ends are gripped by the contacting portion 48 which extends outwardly through the cap 43 and is engaged by a manipulating ring 41. Preferably the parts are secured together by means of solder as indicated at 48, or they may be secured in any other suitable manner.

The lower end of the fusible wire 44 and strain wire are secured as indicated at 49 to a flexible leader 50 which extends outwardly through the lower end of the tube 4| and terminates in a portion 5| which is secured within a lower approximately conical metal member 52, corressponding in external contour to the metal cap 43.

A manipulating ring 53 is secured to the member 5| and preferably the parts are joined by means of solder 54 or in any other suitable way. A weather seal in the form of a tubular member 55 is provided for the normally lower end of the fuse tube 4|. This tubular member 55 is provided with a flange 56 which is held in sealing engagement with the normally lower end of the tube 4| by means of a spring 51 located internally of the tubular member 55. One end of the spring bears against such tubular member 55 and the other end of the spring bears against the member 58 which slidably receives the normally lower end of the tubular member 55 as shown in Figure 8.

The sleeve 58 is provided with a portion 59 which may take the form of a collar and which is firmly secured to the leader 50. It is obvious that the collar portion 53 could be either integral with the sleeve 58 as described hereinabove, or could be a separate member.

It is obvious from the description hereinabove given that the weather seal prevents water from entering the fuse tube and permits the fuse tube to be used in the inverted position from that shown in Figure 8 if so desired. It is also apparent that when the fuse link blows, one end of the fuse tube is always immediately opened to provide free venting of the gases. The upper cap 43, as stated, frictionally grips the tube 4| It may be desirable to have an even more permanent grip with the tube 4|, in which event the construction shown in Figure 9 is provided. This construction is exactly like that previously described except for the fact that the cap 43' is knurled into a groove formed in the tube 4|;

The members '43 and 52 are approximately conical and may be slightly rounded if desired. They are received within the inwardly opening hooked ends of the stationary and movable arms hereinbefore described and provide adequate contacting surfaces for engaging such hookshaped or eyelet portions. However, they are free from binding in such eyelet or hook-shaped portions and are not gripped by such portions.

It is apparent that when the fuse blows, that the flexible leader 5|! is quickly withdrawn from the tube or shell 4| and that the fiber lining 42 evolves an arc extinguishing gas in a well known manner which also assists in the quick rupture of the arc within the sleeve or tube 4|. The ends of the fuse link are quickly separated and the arc extinguished and the movable arm 20 moves downwardly to thereby increase the spacing betweenthe arm I and the arm 20, see Figure 1.

As will hereinafter appear, the initial portion of the stroke of the arm 20 is rapid and the intermediate portion delayed by the time delay mechanism and the final portion of its stroke is i also rapid. After a suitable interval of delay has occurred, the auxiliary switch 33 is pushed off the parallel portions 36, see Figure 2, and rides upon the slanting portions 38. This causes the auxiliary switch 33 to quickly rock towards closed position, thereby making a quick closing stroke. Thereafter when the arm 20 is released by the time delay mechanism, it also has a quick final stroke and the portions 23, see Figure 6, engage the outer side of the stationary contacts 32 of the intermediate terminal 25. thus transferring the circuit to the next fuse, not only through the switch 33 but also through a part of the arm.

Upon refusing, the lineman hooks the end of the fuse stick or switch stick in the eyelet 41 of the fuse link, see Figure 8. Thereafter the lineman engages the portion 52 of such fuse link within the hooked eyelet portion 2|, see Figure 1. and pulls the arm 20 upwardly and hooks th portion 43 into the eyelet portion 9.

During this operation, the circuit through the reserve fuse is not interrupted as the auxiliary switch 33 remains in closed position. This is possible due to the fact that the arc 39 traced by the portion 22 passes outside of the upper portion of the are 40 traced by the outer end of the auxiliary switch 33, which upper portion of the are 40 is the portion occupied by the upper end of the auxiliary switch 33 when it is in closed position. Thereafter the lineman with the switch stick opens the auxiliary switch 33 and thus transfers the circuit to the new fuse without having at any time caused an opening of the circuit. The lineman moves the auxiliary switch 33 into the position shown in full lines in Figures 1 and 5 so that the auxiliary switch will engage the parallel portions 36, such parallel portions being shown most clearly in Figure 2 With regard to the fuse link shown in Figures 8 and 9, it has been found that normally it is preferable to hold the fuse tube rigidly to the upper member or cap 43 and this may be done either by a very tight frictional grip for the construction shown in Figure 8, or by knurling the cap portion into a groove formed in the tube as shown in Figure 9. However, it also may be found desirable, as when it isdesired to interrupt very heavy loads, to have the frictional grip between the cap 43 and the tube M of Figure 8 of a lesser value so that the tube 4I may blow off free of the cap 43 if desired.

The time delay mechanism hereinbefore referred to comprises a pair of bellows members, namely, the retarding bellows Iill and the storage bellows BI, connected by a restricted passage 62, formed in an intermediate rigid portion 63. This intermediate rigid portion is provided with an annular groove as indicated at 64 in Figure 5, and a pair of transversely extending pins 65 are carried by the housing or terminal member II and serve to hold the bellows construction in position, as is apparent from an examination of such figure.

The restoring bellows carries an internally located restoring spring 66 and is provided at its outer or free end with a rigid member 61 provided with a pair of pins 68 projecting from opposite sides thereof. The projecting pins 68 are loosely carried by a pair of arms of a U- shaped member 69 pivotally supported upon the pin 10 and provided with an outwardly projecting arm II. The pins 68 are also received in a slot 12 formed in the arms of a U-shaped link member I3 which is pivotally carried by means of the pin I8, such pin being in turn carried by the arms of the member H which is rigid with the shaft I5.

The time delay device is provided with an adjusting screw I4 which determines the delay interval. This adjusting screw projects outwardly of the casing and may be carried by the bottom plate or closure plate I4 as shown in Figure 5. Obviously if the screw 14 is moved downwardly, it allows the delay bellows or retarding bellows 60 to open out to a greater extent and consequently increases the delay interval. If a lesser delay interval is needed, the screw is moved inwardly and the delay bellows is allowed to expand to a lesser extent, thus decreasing the delay interval.

It is obvious that when the fuse blows and the shaft I is free to turn, that the spring I6 urges the shaft in a clockwise direction as viewed in Figure 5 and causes the link member 13 to move to the left as viewed in Figure 5.

When the right-hand end of the slot 'I2 is reached, the pins 68 are engagedand the bellows 60 is compressed, thus retarding further rota tion of the shaft I5. However, when the pin I3 passes through a line joining the center of the shaft I5 and the pins 68, the retarding bellows will have no further retarding effect as the toggle link construction has now passed dead center and consequently the shaft I5 can execute a quick final rotary motion.

The retarding and storage bellows are filled with a liquid. Any suitable liquid may be used, such for instance as alcohol.

In refusing, the slots 12 allow the arm 20 to be rocked back to initial position without forcing the bellows to move, the bellows 60 being restored by the spring 66.

The invention may take other forms. For example, the bottom plate or closure plate I4 of Figure 7 may integrally carry a fitting I5 which may be in the form of a socket to receive the terminal I6 of a transformer or other instrumentality, such terminal being preferably carried by means of a bushing H. A suitable set screw I8 is provided to lock the socket I5 on the terminal I6.

It is to be noted that in the event the supporting bracket arm 3 of Figure 1 is used, that the body or insulator I supports the lower terminal II. However, when the device is supported in a manner shown in Figure 7, it is clear that the lower terminal member I I supports the main insulator I. The only alteration in the structure that is needed in order to effect these changes is to omit the bracket 3 of Figure 1 and substitute for the lower cover plate I4 of Figure 1 the new cover plate I4 with the socket member I5 of Figure 7. There is no other change needed in the structure.

It will be seen that a novel form of repeating cut-out construction has been provided which has a time delay means for delaying the transfer of the circuit from the blown fuse to the succeeding fuse, and which has an auxiliary switch so arranged that the auxiliary switch automatically executes a quick closing stroke when it is moved due to the blowing of the first fuse.

It will be seen further that the auxiliary switch maintains contact and prevents opening of the circuit when refusing is taking place, the auxiliary switch being positioned out of the return path of movement of the actuating part which initiated the closing of the auxiliary switch.

It is to be noted that the auxiliary switch and the rear portion of the first described movable arm each individually constitute transfer switch means, and that although one of the transfer switch means is opened during refusing, the other transfer switch means remains closed until pulled open by the switch stick of a lineman. The transfer switch means connect the second terminal, namely, the bottom terminal in the form illustrated, with the third terminal, namely, the intermediate terminal, and thus connect the reserve fuse in circuit between the first terminal, namely, the upper terminal, and the second terminal, namely, the lower terminal, upon blowing of the first fuse link.

It will be seen further that although the auxiliary switch is closed by the rear portion of the first described movable arm, nevertheless without the use of any auxiliary mechanism whatsoever the opening movement of the rear portion of the first mentioned movable arm does not open the auxiliary switch.

Although this invention has been described in considerable detail, it is to be understood that such description is intended as illustrative rather than limiting, as the invention may be variously embodied and is to be interpreted as claimed.

We claim:

1. A repeating cut-out construction comprising a body portion, a first terminal member carried by said body portion adjacent one end thereof and having a fuse link receiving portion, a second terminal member adjacent the other end of said body portion and having a movable arm provided with a fuse link receiving portion and biased toward motion away from said first terminal member, a fuse link normally carried by said fuse link receiving portion and restraining said movable arm against motion, a reserve fuse link, and an auxiliary switch for connecting said reserve fuse link between said terminal members, said auxiliary switch having at least the initial portion of its closing stroke initiated by -movement of said movable arm, said auxiliary switch remaining closed when said movable arm is moved back to its initial position during refusing.

2. A repeating cut-out construction comprising a body portion, a first terminal member carried by said body portion adjacent one end thereof and having a fuse link receiving portion, a second terminal member adjacent the other end of said body' portion and having a movable arm provided with a fuse link receiving portion and biased toward motion away from said first terminal member, a fuse link normally carried by 7 said fuse link receiving portion and restraining said movable arm against motion, a reserve fuse link, and a self-closing auxiliary switch for connecting said reserve fuse link between said terminal members, said auxiliary switch having at least the initial portion of its closing stroke initiated by movement of said movable arm, said auxiliary switch remaining closed when said movable arm is moved back to its initial position during refusing.

3. A repeating cut-out construction comprising a body portion having a first terminal provided with a pair of arms projecting outwardly therefrom and having a second terminal with a movable arm projecting outwardly therefrom, and a third terminal having an arm projecting outwardly therefrom, a pair of fuse links normally connecting the arms of said pair of arms to said movable arm and to the arm of said third terminal respectively, means biasing'said movable arm toward motion away from said first terminal, and a transfer switch carried by said second terminal and moved by said movable arm towards closed position when said movable arm moves outwardly, said transfer switch when closed connecting said second and third terminals and being adapted to remain closed when said movable arm is moved back to its initial position during refusing and being adapted to be independently opened.

4. A repeating cut-out construction comprising a body portion having a first terminal provided with a pair of arms projecting outwardly therefrom and having a second terminal with a movable arm projecting outwardly therefrom, and a third terminal having an arm projecting outwardly therefrom, a pair of fuse links nor mally connecting the arms of said pair of arms to said movable arm and to the arm of said third terminal respectively, means biasing said movable arm toward motion away from said first terminal, and a transfer switch carried by said second terminal and moved by said movable arm towards closed position through a predetermined distance when said movable arm moves outwardly, means for completing the closing stroke of said transfer switch after the motion of said switch has been initiated by said movable arm, said transfer switch when closed connecting said second and third terminals and being adapted to remain closed when said movable arm is moved back to its initial position during refusing and being adapted to be independently opened.

5. A repeating cut-out construction comprising an elongated insulating body portion having a first terminal adjacent one end provided with a pair of arms projecting outwardly therefrom and having a second terminal adjacent the other end with a movable arm projecting outwardly therefrom, and a third terminal located between the first and second terminals having an arm projecting outwardly therefrom, a pair of fuse links normally connecting the arms of said pair of arms to said movable arm and to the arm of said third terminal respectively, means biasing said movable arm toward motion away from said first terminal, and a transfer switch carried by said second terminal and moved by said movable arm towards closed position when said movable arm moves outwardly, said transfer switch when closed connecting said second and third terminals and being adapted to remain closed when said movable arm is moved back to its initial position during refusing and being adapted to be independently opened.

6. A repeating cut-out construction comprising an elongated insulating body portion having a first terminal adjacent one end provided with a pair of rigid arms projecting outwardly therefrom and having a second terminal adjacent the other end with a movable arm projecting outwardly therefrom, and a third terminal located between the first and second terminals having an arm projecting outwardly therefrom and biased for motion away from said first terminal, a pair of fuse links normally connecting the arms of said pair of arms to said movable arm and to the arm of said third terminal respectively, means biasing said movable arm toward motion away from said first terminal, and a transfer switch carried by said second terminal and moved by said movable arm towards closed position when said movable arm moves outwardly, said transfer switch when closed connecting said second and third terminals and being adapted to remain closed when said movable arm is moved back to its initial position during refusing and being adapted to be independently opened.

7. A repeating fuse construction comprising an elongated insulating body portion adapted to be mounted in a substantially vertical position and having an upper terminal provided with a pair of fuse link receiving portions and having a lower terminal provided with a downwardly biased fuse link receiving arm, means for permanently connecting said upper and lower terminals in a power circuit, a fuse link connecting said upper terminal and said downwardly biased arm, an intermediate terminal carried by said body portion and provided with a second downwardly biased arm, a second fuse link connecting said upper terminal and said second downwardly biased arm transfer switch means for connecting said lower terminal to said intermedi ate terminal upon blowing of said first mentioned fuse link, and time delay means for providing a time interval between the blowing of the first fuse link and the closing of the transfer switch means.

8. A repeating fuse construction comprising an elongated insulating body portion adapted to be mounted in a substantially vertical position and having an upper terminal provided with a pair of fuse link receiving portions and having a lower terminal provided with a downwardly biased fuse link receiving arm, a fuse link connecting said upper terminal and said downwardly biased arm, an intermediate terminal carried by said body portion and provided with a second downwardly biased arm, a second fuse link connecting said upper terminal and said second downwardly biased arm, transfer switch means for connecting said lower terminal to said intermediate terminal upon blowing of said first mentioned fuse link, time delay means for providing a time interval between the blowing of the first fuse link and the closing of the transfer switch means, said transfer switch means including an auxiliary switch member which normally remains in open position, and means for automatically moving said auxiliary switch member to closed position after it has been moved part way towards closed position.

9.- A repeating fuse construction comprising an elongated insulating body portion adapted to be mounted in a substantially vertical position and having an upper terminal provided with a pair of fuse link receiving portions and having a lower terminal provided with a downwardly biased fuse link receiving arm, a fuse link connecting said upper terminal and said downwardly biased arm, an intermediate terminal carried by said body portion and provided with a second downwardly biased arm, a second fuse link connecting said upper terminal and said second downwardly biased arm, transfer switch means for connecting said lower terminal to said intermediate terminal upon blowing of said first mentioned fuse link, and time delay means for providing a time interval between the blowing of the first fuse link and the closing of the transfer switch means, said transfer switch means including a part of said first mentioned downwardly biased arm and an auxiliary switch member, said auxiliary switch member remaining in closed position when said first mentioned downwardly biased arm is moved back to its initial position during refusing.

10. A repeating cut-out construction comprising a first terminal member having a pair of arms, a second terminal member, a movable arm carried by said second terminal member and biased for movement away from said first terminal member, connecting means severable upon overload normally connecting one of said first mentioned arms and said movable arm and restraining said movable arm against motion, a fourth arm adjacent said movable arm, connecting means severable upon overload normally connecting the other of said first mentioned arms and said fourth arm, and normally open switch means separate and distinst from said movable arm and movable to closed position to connect said fourth arm and said second terminal member, said switch being closed when said movable arm is released by said first mentioned connecting means upon the occurrence of an overload.

11. A repeating fuse device comprising an elongated insulator having upper and lower terminals and an intermediate terminal, supporting means constituting a permanent part of the power circuit through said device for supporting said device from said lower terminal and directly electrically connected to said lower terminal, said lower terminal being in the form of a housing, a fuse link normally connecting said upper and intermediate terminals, a downwardly biased arm carried by said lower terminal, a fuse link normally connecting said upper terminal and said arm and restraining said arm, normally open transfer switch means for connecting said lower terminal to said intermediate terminal when said arm is re1eased,-and time delay means housed within said lower terminal for providing a delay between the fusing of said second mentioned fuse link and the closing of said transfer switch means.

12. A repeating fuse device comprising an elongated insulator having upper and lower terminals and an intermediate terminal, supporting means constituting a permanent part of the power circuit through said device for supporting said device from said lower terminaland directly electrically connected to said lower terminal, said lower terminal being in the form of a housing, a transversely extending shaft carried by said housing, an arm carried by said shaft and projecting outwardly from said housing, a first fuse link connecting said arm with said upper terminal, a second fuse link connecting said upper and intermediate terminals, a normally open transfer switch for connecting the lower terminal to said intermediate terminal, spring means biasing said shaft for rotation to move said arm downwardly and to close said transfer switch, and time delay means for delaying the rotation of said shaft, said time delay means being housed within said lower terminal.

13. A repeating fuse construction comprising an elongated insulator having upper and lower terminals and an intermediate terminal, said lower terminal being in the form of a housing, a transversely extending shaft carried by said housing, an arm carried by said shaft and prov jecting outwardly from said housing, a first fuse link connecting said arm with said upper terminal, a second fuse link connecting said upper and intermediate terminals, a normally open transfer switch for connecting the lower terminal to said intermediate terminal, spring means biasing said shaft for rotation to move sa d arm downwardly and to close said transfer switch, and time delay means for delaying the rotation of said shaft, said time delay means being housed I within said lower terminal, said transfer switch being distinct and separate from said arm and remaining in closed position when said arm is rocked back to its initial position during refusing.

14. In a repeating fuse construction the combination of two main terminals and an auxiliary terminal, a pair of fuse links having one end of each link electrically connected to one of said main terminals and having the other ends of said links respectively electrically connected to the other of said main terminals and to said auxiliary terminal, a movable member biased towards motion and restrained by the fuse link and electrically connected to the last mentioned main terminal, transfer switch means for connecting said last mentioned main terminal to said auxiliary terminal when said movable member is moved beyond a predetermined point, time delay means, and toggle link mechanism operatively connecting said movable member to said time delay means, said toggle link mechanism causing said time delay means to delay a portion of the motion of said movable member and passing through dead center upon continued motion of said movable member, whereby said movable member is free from the effect of said time delay means after said toggle link mechanism has passed through dead center.

15. A repeating fuse construction comprising a first main terminal and a. second main terminal and an auxiliary terminal, a first fuse link electrically connecting said second main terminal to said first main terminal, a second fuse link electrically connecting said auxiliary terminal to said first main terminal, a normally open transfer switch pivoted on said second main terminal and adapted to electrically connect said auxiliary terminal with said second main terminal when said transfer switch is closed, a movable member biased towards motion and normally mechanically restrained by said first mentioned fuse link, said movable member having means for moving said transfer switch through the initial portion of the closing stroke of said transfer switch, said transfer switch including a resilient U-shaped mem-- her, and cam means cooperating therewith and having one portion of the cam means exerting no closing force on said transfer switch and another portion of said cam means tapered. whereby said transfer switch is urged towards closed position when it arrives at the tapered portion of said cam means.

WILLIAM 0. SCHULTZ. ALWIN G. STEINMAYER,

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