US2843703A

US2843703A - Fuse protective system

Info

Publication number: US2843703A
Application number: US408086A
Authority: US
Inventors: Grepe Frederick Yorke
Original assignee: Clark Controller Co
Current assignee: Clark Controller Co
Priority date: 1954-02-04
Filing date: 1954-02-04
Publication date: 1958-07-15
Anticipated expiration: 1975-07-15

Description

July 15, 1958 F. Y. GREPE FUSE PROTECTIVE SYSTEM Filed Feb. 4, 1954 4 Sheets-Sheet l INVENT OR ATTORNEY July 15, 1958 IF. Y. GREPE 2,843,703

FUSE PROTECTIVE SYSTEM Filed Feb. 4, 1954 4 Sheets-Sheet 2 .BY 6 a l ATTORN Y y 15, 1958 m. GREPE I 2,843,703

FUSE PROTECTIVE SYSTEM Filed Feb.. 4, 1954 4 Sheets-Sheet 3 INVENT OR July 15, 1958 F. Y. GREPE 2,843,703

FUSE PROTECTIVE SYSTEM Filed Feb. 4, 1954 I 4 Sheets-Sheet 4 I NEE-1% amedzmicfl 3. 944 90,

I ATTORNEY United States Patent FUSE PROTECTIVE SYSTEM Frederick Yorke Grepe, Toronto, Ontario, Canada, as-

signor to The Clark Controller Company, Cleveland, Ohio, a corporation of Ohio Application February 4, 1954, Serial No. 408,086

12 Claims. (Cl. 200-414) My invention relates broadly to protective systems for heavy-duty electrical circuits and more particularly to a combined manual and automatic protective fuse system for electrical circuits.

One of the objects of my invention is to provide a construction of manual and automatic protective fuse system for electrical circuits of heavy-duty characteristic such as 500,000 kilovolt amperes whereby a power circuit is automatically disconnected from the fuse terminals upon the blowing of the fuse with provision for also manually disconnecting the power circuits from the fuse terminals.

Another object of my invention is to provide a composite automatic and manually operated disconnect system for electric fuses in heavy-duty power circuits which permits withdrawal of a blown fuse for replacement or which effects opening of the power circuit to allow repairs of the circuits normally protected by the fuse to be safely conducted.

Still another object of my invention is to provide a fuse system employing a pair of aligned jaw-like receptacles in one of which a cartridge type fuse may be pivotally installed for orientation into or out of position establishing connection or disconnection with the other of the jaw-like receptacles with means associated with the cartridge fuse and the last-mentioned jaw-like receptacle for effecting either an automatic or manual disconnect operation for isolating the power circuits from the fuse.

Still another object of my invention is to provide an arrangement of attachment means which may be readily applied to opposite terminals of a cartridge type fuse for co-action with special fuse-receiving receptacles about one of which receptacles the fuse may be oriented for engagement with the other of the receptacles preparatory to either an automatic disconnect operation or a manual disconnect operation whereby the associated power circuits are isolated from the fuse-receiving receptacles.

Still another object of my invention is to provide a construction of fittings for the terminal ends of a cartridge type fuse and for the fuse-receiving receptacles whereby manual installation and removal of the fuse in the fuse-receiving receptacles is facilitated while permitting the automatic tripping of the power circuits to the fuse-receiving receptacles under conditions of blowing of a fuse.

A still further object of my invention is to provide a cartridge type fuse disconnect or switching device which upon blowing of the fuse develops a mechanical force which in turn operates a linkage arranged to operate a snap-action relay which trips out an associated circuit breaker or contactor for isolating the fuse terminals with respect to the power circuits.

Still another object of my invention is to provide a construction of cartridge type fuse mounting which includes snap-action mechanism associated with the terminal ends of the fuse serving to interlock the fuse with a switch or contactor and insuring the opening of the power circuits associated with the fuse before disconnection of the fuse from the power circuits.

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Other and further objects of my invention reside in the construction of mechanism for pivotally mounting a cartridge type fuse in a fuse receptacle in association with automatic disconnect means for isolating the fuse from power circuits as set forth more fully in the specification hereinafter following, by reference to the accompanying drawings, in which:

Figure 1 is a side elevational view schematically illustrating a fuse installation in accordance with my invention, the fuse being shown in a position for normal operation in the protection of a polyphase power circuit;

Fig. 2 is a view similar to Fig. 1 but illustrating on a reduced scale the automatic disconnect operation of the fuse system under the action of the blowing of a fuse by one of the methods of my invention;

Fig. 3 is a perspective view showing a fuse in position in accordance with my invention preparatory to either an automatic or a manual disconnect operation;

Fig. 4 is a fragmentary side elevational view of the upper receptacle which receives the upper end of the cartridge type fuse and showing particularly the arrangement of the tripping mechanism which is either automatically or manually tripped for effecting a disconnect operation and isolating the fuse from the associated power circuits;

Fig. 5 is a view similar to Fig. 4 showing the manner in which the manual disconnect operation isolates the fuse from the power circuits by tripping the power circuits to open position before removal of the fuse from the fuse receptacles;

Fig. 6 is a view illustrating the next successive operation following the power circuit tripping operation of Fig. 5 and illustrating the fuse in the process of being removed from the fuse receptacle;

Fig. 7 is a perspective view illustrating the manner of manually removing or installing a cartridge type fuse in the associated receptacles in accordance with my invention;

Fig. 8 is a view similar to the view illustrated in Fig. 7, but illustrating the cartridge type fuse pivotally mounted in the lower receptacle preparatory to orientation into engaged position in the upper receptacle;

Fig. 9 is a fragmentary front elevational view of the upper end of the cartridge type fuse mounted in the associated receptacle;

Fig. 10 is a perspective view of the components of the latch and interlock mechanism employed in the structure of my invention;

Fig. 11 is a perspective view of the components of the actuating mechanism;

Fig. 12 is a perspective view of the mounting plate attached to the upper end of the cartridge type fuse;

Fig. 13 is a perspective view of the bottom plate and yoke attached to the lower end of the cartridge type fuse; and

Fig. 14 is a view showing the components of the pivot mounting assembly for detachably supporting the lower end of the cartridge type fuse.

My invention is directed to a construction of protec tive fuse and mounting means therefor, including tripping mechanism which is automatically operated when the fuse blows for isolating the circuit terminals at the fuse receptacle from the associated power circuits which will enable the fuse to be removed and replaced or repairs and adjustments to be made on the fuse receptacle with complete safety. I provide fittings attachable to the opposite terminals of a cartridge type fuse for co-action with receptacles for mounting the opposite terminals of the fuse. In one receptacle I mount a transverse pivot bar which supports a rockable member over which a downwardly directed fork on the bottom fitting that attaches to the terminal of the carridge fuse may be engaged and angularly shifed to a position for engaging the opposite end of the cartridge fuse in the opposite aligned recep tacle. The upper end of the fuse is provided with a composite fitting, including means enabling the cartridge to be manually engaged for orientation into and out ofposition in the aligned receptacle. The end of the cartridge may also include a variety of means for operating an ejection plunger upon blowing of the fuse such as by an explosive device that operates upon the blowing of the fuse for bulging or displacing some part of the cartridge. Such displacement operates an actuator that trips a latch resulting in the automatic tripping of the circuit controlling mechanism and the opening of the power circuit to the fuse receptacles. With the power circuits thus isolated from the fuse receptacles the fuse may be withdrawn and replaced or repaired and adjustments made on the operating and tripping mechanism.

In a polyphase system the blowing of any one fuse automatically trips open the switch or contactor, clears all phases simultaneously and, what is most important, prevents single phasing. The problem of single phasing has always been a bugbear in the use of fuses. The device may be manually operated by pushing or pulling on an associated rod or by rotating an associated crank shaft. The preferred way is by pushing or pulling on the rod engaged in a ring in the upper attachment fitting on the fuse.

In the application of my invention where an explosive displaceable striker pin is associated with the fuse, when the fuse blows, the striker pin is ejected and is held ejected by a spring locking ring within the body of the fuse. The fuse must be dismantled to get at this ring so that it is, therefore, inaccessible to the operator and cannot be pushed back down.

Referring to. the drawings in more detail, reference character ll designates a rack or panel on which there is mounted the pedestal insulator 2 projecting forwardly from the rack and forming a mounting means for the top receptacle 3 for the upper terminal of a cartridge fuse 4. The fuse receptacle 3 is a multiple spring jaw assembly which is secured by a suitable retaining bolt 5 to the top plate 6 carried by the corona shield 7 secured to the end of the pedestal insulator 2. The plate 6 has an extension 6a at the upper end thereof provided with an aperture 6-17 therein which facilitates installation of the assembly. The rod 8 formed from insulation material is provided with spaced flanges 9 of insulation material distributed along the length thereof for insuring complete insulation of the tripping mechanism with respect to the power circuit control contacts shown at 1% housed within casing 11 supported by bracket 12 from the rear of rack 31. The power circuit control contacts comprise stationary contacts 14- and movable contacts 15 controlled by movement of pivotally mounted spring biased lever 16 pivoted at 17. The positions of contacts 14 and 15 which control a polyphase power circuit leading to the cartridge type fuse 4- are controlled by the coaction of the tension spring 59 and the compression of spring 59a. The tripping mechanism represented at if, is shown in normal position in Fig. 1 with the contacts closed and in Fig. 2 with the contacts open.

In the lower right-hand portion of Fig. l, I have illustrated the manner in which the protective system of this invention is associated with a polyphase circuit represented at 7%. In this arrangement the circuits leading to the fuses represented at 71, 72 and 73 include contactors which are maintained closed so long as operating solenoid 74 is energized. However, when operating solenoid 74 is de-energized, the circuits through the contactors '75, 76 and 77 are opened under the action of spring 78 which pulls actuating member 79 to open the circuits through the fuses. The protective system of my invention is applicable to many arrangements of the polyphase circuits illustrated herein, by way of example.

The tripping mechanism is journaled between a pair of plate members shown at 19 and 2t) projecting from the front of plate 6 and forming mounting means for the transverse pin 21. The transverse pin 21 forms journaling means for the transversely extending member 22 from which lugs 22a and 22-h project for journaling transverse pin 21. The transversely extending member 22 serves as a mounting for the strip 23 which carries the upwardly extending member 24 which is pivotally connected at 25 to the rod of insulation material 8. Thus angular rocking movement of member 22 imparts corresponding movement to arm 24 for moving rod 3 in a linear direction for controlling the power contacts 14 and 15. The member 22 is provided with a forwardly projecting tripping lever 26 which extends to a position slightly beyond the axis of the cartridge type fuse 4 when the fuse is mounted in receptacle 3. The tripping lever 26 has an adjustable abutment stop in the end thereof formed by a screw 27 having a lock nut 27-a thereon which permits the abutment stop constituted by the head 27-11 of screw 27 to be advanced to a position at which the striker pin 28, or other displaceable member, can engage the head 27-17.

The transverse pin 21 also provides journaling means for the latch element 29 for co-action with the lock element shown at 62, pivoted on pin 63 that extends between and outwardly projecting bracket constituted by

plate members

19 and 20. The lock element 62 is spring biased by coil spring 64 that is centered by pin 63 and fits over plate member 19 at one end and engages the lock element 62 at the other end. The lock element has two oppositely extending arms, disposed at approximately 90 to each other, one of which terminates in a cam-shaped end 62a and the other of which terminates in a locking head 62b. The cam-shaped end 62-a coacts with the latch head 30 of the terminal end 31 of the cartridge fuse while the locking head 62b coacts with the projecting end 29a of latch element 29.

The cartridge fuse 4 is equipped on the end of the terminal cap 31 thereof with an attachable head formed by the centrally apertured plate 36 secured in position on the terminal end of the cartridge fuse by cap screws 39. The plate 36 is provided with a pair of spaced lugs 4! between which the lock lever 41 is pivoted as represented at 42. The lock lever 41 is provided with a transversely extending arm 41-a transversely apertured at 41b for the passage of the ejector pin 28. The plate 36 carries the latch head 30 engageab le'by latch 29 as hereinbefore explained. The position of lock lever 41 is angularly adjustable by means of a set screw 41c which engages one side of the terminal cap 31 of the cartridge fuse 4, thereby predetermining the angular elevation of the arm 41-a above the end plate 36. The lock lever 41 is provided with a ring portion 41d through which the prong of the manual rod 32 may be inserted, as illustrated in Fig. 8, in withdrawing or replacing a fuse in the fuse receptacles. The cartridge fuse 4 is lifted out of engagement with the receptacles or inserted into the receptacles by use of manual rod 32 in the arrangement represented in Fig. 7 where forked end'34 engages beneath the lock lever 41 as illustrated in Fig. 7. V

In order to provide for the orientation of the cartridge fuse 4 about the lower receptacle, I provide an attachment on the lower end of thefuse cap 43 of the cartridge fuse 4 in the form of a plate 44 from which fork 45 lineally projects. The fork 45 has a bifurcation which extends over the rockable member 46 journaled on pin 47 in spaced lugs 48 which project from the plate 49 secured by bolts 50 to a corona shield 51 on the end of pedestal insulator 52 supported on the rack 1 in a position 7, inserting the fork 45 over the pivoted plate 46 which is gravitationally suspended-in an angular position as represented in Fig. 7, preparatory for receiving the fork-ed end 45 of the fuse cartridge. The rockable member 46 normally remains in the angularly disposed position illustrated in Fig. 7 by abutment with suitable stops located between the inner faces of lugs 48 under the action of biasing spring id-41 one end of which is engaged in one end of the lugs 48 and the other end of which is engaged in the slot 4645 in rockable member 46, enabling the manual rod 32 to be withdrawn from the position illustrated in Fig. 7, and axially shifted to the position in which prong 35' is inserted through ring 41-51 as represented in Fig. 8, whereupon the cartridge fuse 4 is oriented about transverse pivot pin 47 as a center to a position in which terminal cap 31 is engaged between spring jaws 3 and latching head 30 is engaged beneath latch 29.

The lock lever 41 operates to raise latch 29 and correspondingly elevate trip lever 26 when the fuse t is manually removed by use of manual rod 32 resulting inthe shifting of interlock rod 8 through rack 1 and the movement of contact lever 16 for opening contacts 14 "and 15', thereby opening the power circuit to the fuse before the fuse is removed from the

receptacles

3 and 53 and this enables the fuse to be removed with perfect safety. For this purpose adjustment may be initially made by movement of set screw 41c to provide for necessary displacement of the lock lever 41. That is to say, when the prong 35 of hook stick 32 is inserted in the ring 41-0! of lock lever 41 and an outward pull effected, the lock lever 41 pivots about transverse pin 42 and lifts latch 27. Locking element 62 restrains latch 29 until the actuating element constituted by lock lever 41 is manuallydisplaced or the trip lever 26 operated by some device comparable to striker pin 28. In the latter instance, the latch 29 lifts the trip lever 26 actuating the interlock rod 8 through member 24. Movement of the interlock rod 8 opens the contacts 14 and 15 of the snap-action relay in the rear of the rack 1 opening the power circuits and permitting withdrawal of the fuse. This insures that the fuse cannot be withdrawn under load conditions. When the fuse has been withdrawn, latch 29 is then mechanically locked open by locking element 62 and cannot be tripped until a replacement fuse is inserted and locked in operating position.

The striker pin 28 in the end of the cartridge fuse 4 is illustrated simply as one of the methods of operating the protective system. When the fuse 4 isblown, according to one of the methods of my invention, the spark discharged therefrom may ignite an ignition fuse communieating a flame to an explosive charge which explodes. The force of the explosion confined within the cartridge serves to axially eject the striker pin 28 which passes through aperture 4147 in lock lever 41 and engages the abutment stop formed by screw head 2742, thereby angularly shifting trip lever 26 and moving interlock rod 8 from the position shown in Fig. 1 to the position shown in Fig. 2, thus opening the circuit through contacts 14 and 15. The power circuits to the

fuse receptacles

3 and 53 are now isolated so that removal and replacement of the blown fuse can be proceeded with safely.

The snap-action relay includes coil springs 59 and 59-a which control the position of lever 16. The tension of spring 59 holds the rod 8 toward the left and 'holds actuating arm 26 down, and this holds latch 29 down in latching position. A space at 8i) provides for such movement of lever 16 that spring a can expand and hold contacts i5 closed. When arm 26 is forcibly raised by raising hook 29 and forcibly moving rod 8 toward he right against tension of spring 59, the space 89 is closed and the collar or nut 81 strikes the end of the switch arm and opens the contacts against the pressure of spring 59-a. The latch 62 keeps the rod 8 held toward the right in spite of the extension of spring 59. When the fuse is blown or removed and rod 8 displaced to the position shown in Fig. 2, coil spring 59 contracts and coil spring SSLa expands as member 60 is displaced toward the right looking at Figs. 1 and 2, thereby moving contacts 15 away from fixed contacts 14 and opening the power circuit through contacts 14 and 15 to the fuse receptacles.

In the operation of the. protective system, the handle element or lock lever 41 is biased to a first position and is movable to a second position. The latch element 29 is movably supported on a frame and is biased to normally latch the fuse end in its receptacle and is movable to unlatching position. The lock element 62 is movably supported on the frame and biased toward a locking position and is normally held in unlocking position by engagement with the fuse and when in its receptacle. The actuating element 26 is movably supported on the frame and is biased to a normal position and movable to an actuating position and back to normal position and is adapted to acuate a circuit controlling device by said movements. The said elements are arranged to operate as follows: manual movement of the handle element or lock lever 41 from a first position to a second position moves the actuating element 26 to actuating position and then moves the latch element 2? to unlatching position, and continued movement of the handle element lock lever 41 withdraws the fuse end out of the receptacle 3 and its withdrawal movement permits the lock element 62 to move to lock the latch element 29 in unlatched position and the actuating element 26 in actuating. position. Upon manual movement of the handle element or lock lever 41 of the same fuse or of a like fuse in the other direction, the handle element is returned to itsfirst position and the fuse end is returned into the receptacle, the end of the fuse restoringthe lock element 62 and thereby unlocking the latch element 29 and actuating element 26, the latch element returning to latching position whereupon the actuating element returns to its normal position.

I have found the construction described herein highly practical in manufacture and production and efiicient in use, but I realize that modifications may be made, and I desire that it be understood that no limitations upon my invention are intended'other than may be imposed by the scope of the appended claims.

What I claim and desire to secure by Letters Patent of the United States is:

1. In a fuse disconnect mounting and mechanism for supporting a fuse of the cartridge type, comprising supporting means, a pair of laterally open receptacles for the-ends of a cartridge fuse, mounted in said receptacles, a movable actuating element for actuating an apparatus associated with the fuse and biased to a normal position, a movable latch element disposed normally in a latching position and latching an end of the cartridge fuse in its associated receptacle, a manually controllable member supported on said end of the cartridge fuse and movable manually to move the actuating element to an actuating position subject to restoration to an unactuating position, lock means to lock the actuating element in actuating position before the cartridge fuse end is withdrawn, the mechanism being operable by movement of the said end of said fuse into the associated receptacle to successively set the latch element and unlock the actuating element for return to its normal position.

2. A fuse disconnect mounting and mechanism for supporting a fuse of the cartridge type that forcibly ejects a fuse projectable element outwardly when the fuse blows, comprising supporting means, a pair of laterally open receptacles for the ends of the fuse mounted with respect to said supporting means, a movable actuating element for actuating an apparatus associatedwith the fuse and biased to a normal position, a movable latch element journaled with respect to said supporting means and disposed normally in a latching position, and latching an end of the cartridge fuse in its associated receptacle, manually controllable means supported on an end of the cartridge fuse and movable to displace the actuating element to an actuating position subject to return to its normal position and withdraw the cartridge fuse end from the receptacle, and lock means to lock the actuating element in actuating position before the cartridge fuse end is withdrawn, said mechanism being operable by movement of the cartridge fuse end into the receptacle to successively set the latch element and unlock the actuating element for return to its normal position, said actuating element being disposed in the path of movement of the fuse projecting element and movable thereby to actuating position.

3. A fuse disconnect mounting and mechanism for supporting a fuse of the cartridge type, comprising a support, a pair of laterally open receptacles for the ends of a cartridge fuse mounted with respect to said support, a movable actuating element for actuating a circuit breaker associated with said fuse and biased to a normal position, a mechanism comprising a movable latch element pivotally mounted with respect to said support and normally maintained in a latching position for latching an end of the cartridge fuse in its associated receptacle, a manually controllable element supported on the end of the cartridge fuse and movable to move the latch element to cause it to engage the actuating element subject to an unlatching operation and withdrawal of the fuse from its receptacle, and spring biased lock means journaled on said support adjacent one of said receptacles to lock the latch element in unlatched position to cause it to retain the engaged actuating element in actuated position, said mechanism being operable by movement of the cartridge fuse end with re spect to the receptacle to release the said lock means and to successively set the latch element to latch the fuse in the receptacle and release the actuating element for return to its normal position.

4. A fuse disconnect mounting and mechanism for supporting a fuse of the cartridge type that forcibly ejects a fuse projectable element outwardly when the fuse blows, comprising supporting means, a pair of laterally open receptacles for the ends of the fuse cartridge mounted on said supporting means, a movable actuating element for actuating an apparatus associated with the fuse and journaled with respect to said supporting means and biased to a normal position and movable to an actuating position, a movable latch element pivoted on said support and disposed normally in a latching position and latching an end of the cartridge fuse in its associated receptacle, a member pivotally supported on one end of the fuse and movable manually to move the latch element to cause it to unlatch said fuse end for permitting withdrawal of the fuse cartridge from its associated receptacle and to move the actuating element to an actuating position, and lock means to lock the latch element in unlatched position and to retain the actuating element in actuated position, said mechanism being operable by movement of the end of the cartridge fuse with respect to the associated receptacle to release the said lock means and to successively set the latch element to latch the fuse end and release the actuating element for return to its normal position, said actuating element being disposed in the path of the fuse projectable element and movable thereby to actuating position.

5. A fuse disconnect mounting and mechanism for supporting a fuse of the cartridge type that forcibly ejects a projectable element outwardly and retains it in outer position when the fuse blows, comprising a pair of insulated supports, a laterally open receptacle mounted on each of said supports for supporting the ends of the fuse, a bracket carried by one of said supports adjacent the receptacle thereon, a movable actuating element for actuating an apparatus associated with the fuse and journaled in said bracket and biased to a normal position and disposed in the path of movement of the projectable element and movable to and retained in an actuating position by movement of the projectable element, a movable latch element disposed normally in latching position for latching an end of the cartridge fuse in said last mentioned receptacle, a manually controllable element supported on the end of the fuse cartridge and movable within limits to either of two positions and in one of which it moves the latch element to unlatching position and enables the fuse cartridge to be withdrawn from the receptacle, and the other of which enables the end of the fuse cartridge to be maintained in the said receptacle, lock means operable by said other movement of the manually controllable element to lock the actuating element in actuating position independently of the projectable element on the fuse cartridge when the fuse cartridge is withdrawn from the receptacles, and the latch element being operable by movement of the end of a replacement fuse into the receptacle to restore it to latching position and to correspondingly restore the lock means to permit the actuating element to return to normal position.

6. A fuse disconnect mounting and mechanism for supporting a fuse of the cartridge type that forcibly projects an element outwardly and retains it in outer position when the fuse blows, comprising a pair of spaced insulated aligned supports, a laterally open receptacle carried by each of said supports for supporting the ends of the fuse, a movable actuating element for actuating a circuit breaker associated with said fuse and biased to a normal position and disposed in the path of movement of the projectable element of said fuse and movable to and retained in an actuating position by movement of the projectable element, mechanism mounted on one of said supports and comprising a movable latch element disposed normally in latching position and operative for latching an end of the cartridge fuse in its receptacle, mechanism supported on the end of the cartridge fuse and movable manually to either of two limited positions in one of which said latch element is engaged to cause it to move the actuating element in a direction to retain it in actuated position, and in the other of which said latch element is displaced to unlatching position, and lock means rendered effective by said movement of the latch element to lock it in position to cause it to retain the actuating element in actuated position independently of the fuse projectable element when the blown fuse is withdrawn from said receptacles, and the mechanism being operable by movement of the end of a re placement fuse into the receptacle to restore the lock means and restore the latch element to latching position and permit the actuating element to return to normal position.

7. A fuse disconnect mounting for a cartridge type fuse comprising a pair of laterally open receptacles for the conductive ends of a cartridge type fuse, an actuating element for actuating an apparatus associated with said fuse and biased to a normal position and displaceable to an actuating position and operative to operate said apparatus upon displacement from one position to the other, the actuating element being supported adjacent the end of one of said receptacles, a mechanism at said end of said receptacle comprising a biased latch element normally latching the end of the fuse in said receptacle against withdrawal, and a handle element supported on the end of the fuse end and manually movable to unlatch the latch element to permit the fuse end to be withdrawn and to cause the latch element to move the actuating element to actuating position before the latch element is fully unlatched, said handle element being operative to withdraw the fuse end from said receptacles upon continued normal movement of the handle element, a biased lock element freed to move by withdrawal movement of the fuse end for thereupon locking the latch element in unlatched position and the actuating element in actuating position,"the latch element being restored by movement of a replacement fuse end into the receptacle by the handle elementto restore'thelatch element to latching position and thereby correspondingly restoring'the' actuating elementto normal position.

8. A fuse disconnect mounting'and mechanism for supporting a fuse of the cartridge type having a pin ejectable upon the blowing of the fuse, comprising a support, a pair of receptacles mounted with respect to the sup ort forthe-insertion and removal of the cartridge type fuse, said fuse having a-latching head on one end thereof and provided with a pivotally mounted manually controllable member for manipulating said fuse with respect to said receptacles, said member being angularly displaceable in a plane extending diametrically through the end of said fuse and through the latching head thereon, a latch pivotally mounted with respect to said support in a position above one of said receptacles for engaging the latching head on the end of said cartridge when said cartridge is inserted in said receptacle, a device for actuating a circuit breaker associated with said fuse and controlled by said latch, said member extending beneath said latch and operative to raise said latch when said member is angularly displaced for controlling said device, said member being centrally apertured for the passage of the ejectable pin of said fuse whereby said device is controlled by the ejected pin independently of the displacement of said latch.

9. A fuse disconnect mounting and mechanism for supporting a fuse of the cartridge type having a pin ejectable upon the blowing of a fuse comprising a support, a pair of receptacles mounted with respect to the support for the insertion and removal of the cartridge type fuse, said fuse having a latching head on one end thereof and provided with a pivotally mounted manually controllable member for manipulating said fuse with respect to said receptacles, said member being angularly displaceable in a plane extending diametrically through the end of said fuse and through the latching head thereon, a latch pivotally mounted with respect to said support in a position above one of said receptacles for en-' gaging the latching head on the end of said cartridge when said cartridge is inserted in said receptacle, a device for actuating a circuit breaker associated with said fuse and movable by said latch, said member extending beneath said latch and operative to release said latch when said member is angularly displaced for moving said device, said member being centrally apertured for the passage of the ejectable pin of said fuse whereby said device is also moved by the ejected pin independently of the displacement of said latch, in which a spring biased locking member pivotally mounted with respect to said support and movable to retain said device in the position to which it is moved either by said pin or by the displacement of said member upon removal of the fuse from the associated receptacle and pending restoration of the position of said locking member by abutment of the cartridge fuse therewith upon replacement of a fuse in the associated receptacle.

10. A terminal structure for the end of a cartridge fuse comprising a plate attachable to the end of a cartridge fuse, a latching head carried by one side of said plate adjacent the peripheral edge thereof, a pair of lugs carried by the same side of said plate adjacent the opposite peripheral edge thereof in diametrical alignment with said latching head, a lock lever pivotally mounted in said lugs and extending diametrically of said plate and around the end of the cartridge fuse, one end of said lever terminating short of said latching head and the other end of said lever having an adjustment screw therein for establishing an adjustable abutment with the side of the end of the cartridge fuse and controlling the amplitude of displacement of said lock lever around said lugs as a pivot, the diametrically extending portion of said lock lever being apertured at the center of the end of the cartridge fuse'for the passage therethrough of a projecta'ble; pin associated with said fuse and means g-carried bysaid lock lever for engagement by' an inser- 1 tion and removal tool.

11.- A' fuse disconnect mounting for a cartridge type fuse comprising a pair of laterally open receptacles for the conductive ends of a cartridge type fuse, a-circuit ing position-and operative to operate the circuit'breaker upon'displacement to the actuating position; the actuating element being supported-adjacent'the end-of one of said receptacles, a mechanism at said end of said receptacle comprising a biased latch element normally latching the end of the fuse in said receptacle against withdrawal, and a handle element supported on the end of the fuse end and manually movable to unlatch the latch element to permit the fuse and to be withdrawn and to cause the latch element to move the actuating element to actuating position before the latch element is fully unlatched, said handle element being operative to withdraw the fuse end from said receptacles upon continued normal movement of the handle element, a biased lock element freed to move by withdrawal movement of the fuse end for thereupon locking the latch element in unlatched position and the actuating element in actuating position, the latch element being restored by movement of a replacement fuse end into the receptacle by the handle element to restore the latch element to latching position and thereby correspondingly restoring the actuating element to normal position.

12. A fuse disconnect mounting for a cartridge type fuse, having a circuit breaker in a circuit with a fuse, the mounting comprising a pair of laterally open receptacles for the ends of a cartridge type fuse, a fuse manipulating member on one end of the fuse cartridge comprising a handle element movably supported on the said end of the fuse cartridge and movable to either a first or second position, a frame support, a latch element movably mounted on said frame support adjacent one of said receptacles and biased to normally latch one end of said fuse in said last mentioned receptacle and movable to unlatching position, a lock element movably mounted on the frame support and biased toward a locking position and normally held in unlocking position by engagement with the fuse when in its associated receptacle, an actuating element movably supported on the frame support and biased to a normal position and movable to an actuating position and back to normal position, and means to cause the circuit breaker to open when moved to the actuating position, the said elements being arranged to operate as follows: manual movement of the handle element from first position to second position moves the actuating element to actuating position and moves the latch element to unlatching position, and continued movement of the handle element withdraws the fuse end out of the receptacles whereby its withdrawal movement permits the lock element to move to lock the latch element in unlatched position and upon manual movement of the handle element of the same fuse cartridge or of a like fuse cartridge in the other direction, the handle element is returned to its first position and the end of the fuse cartridge is returned into the receptacle, the end of the fuse cartridge restoring the lock element thereby unlocking the latch element and permitting it to return to latching position and the latch element releasing the actuating element whereby said actuating element returns to normal position.

References Cited in the file of this patent UNITED STATES PATENTS 826,888 Sachs July 24, 1906 1,192,974 Anderson Aug. 1, 1916 (Other references on following page) 11 UNITED STATES PATENTS Wyman Oct. 13, Farrell June 19, Ramsey July 1, Matthews July 15, Matthews Sept. 9, Ludwig et a1. Feb. 10, Dickinson Mar. 23, Triplett June 26, Strang et a1. Sept. 25, Froland Jan. 13, Dannenberg June 14,

12 Steinmayer Apr. 10, Smith Jan. 1, Lindell June 3, Lindell Mar. 2, Schneider May 31, Smith Aug. 30, Schneider Feb. 14,

FOREIGN PATENTS Great Britain Dec. 24, France May 23,