US2050072A - Housed type of drop-out fuse - Google Patents

Description

' A. G. STEINMAYER ET AL HOUSED TYPE OF' DROP-OUT FUSE Filed March l5, 1934 3 Sheets-Sheet lf Aug. 4, 1936.

Aug. 4, 1936. A. G. STEINMAYER ET A1. 2,050,072

HOUSED TYPE OF DROP-OUT FUSE Filed March 15, 1934 s shee'rs-shet 2 Aug. 4, 1936. AA G. STEINMAYER ET AL.

HOUSED TYPE OF DROP-OUT FUSE Filed March 15, i934 5 sheets-sheet 3 Patented Aug. 4, 1936 UNITED STATES PATENT OFFICE HOUSED TYPE F DROP-OUT FUSE Alwin G. Steinmayer, Milwaukee, and William 0. Schults, South Milwaukee, Wis., assignors to une Material Company, South Milwaukee, Wis., a corporation of Delaware Application March 15, 1934, Serial No. 715,668

-20 Claims. (Cl. 200-127) 'I'.his invention relates'to a housed type of dropwhich was detaehably attached to the door, sliding downwardly and detaching itself from the door and from the upper catch which normally restrains the fuse, and thereafter rocking outwardly and downwardly, the door swinging back Y of drop-out fuse which is of simple construction,

towards closed position. l Further objects are to provide a drop-out fuse in which al1 of the live parts are completely enclosed in the housing, in which all contacts of the fuse tube as well as the hinge support for the fuse tube are electrically dead when the fuse has rocked to its down position, in which the door automatically tends to close and protect the live parts within the housing from the weather after the fuse has blown, and in which the contacts of the fuse tube do not break contact with the sta-v tionary contacts of the housing until the circuit has been interrupted by the blowing oi.' the fuse link within the fuse tube, thereby avoiding arcing at the contacts, a certain interval of time elapsing before the breaking of the contacts occurs, thereby giving ample time for the fuse to clear itself, and to provide a construction which has the advantages of both a drop-out fuse and a housed fuse.

Further objects are to provide a construction in which the fuse tube is hinged adjacent its lower end by link mechanism restrained against opening -movement by the. fuse link, in which the fuse tube is biased towards open position, in which latching or restraining means are provided for the upper end of the fuse tube which automatically locks the fuse in circuit closing or operative position, in which means are provided for opening such latching means so that the fuse can be rocked to open position and thus act as a cut-out, and generally to provide a construction which may be as freely handled as an unhoused type of fuse.

In certain forms that the invention may take, additional objects are to provide spring means for holding the door elevated to providethe utmost freedom for the lineman, and to provide means which can be operated by a fuse pole or switch stick for unlatching the'fuse and rocking it to open position.

In other forms that the invention may take, further objects are to provide a novel construction of door such that the door forms an insulat- 5 ing handle for releasing the latching means and also for lifting the fuse from its supporting means during removal, or for replacing a new fuse, and. to provide a, construction in which the lineman or operator is practically forced to remove the door 10 by simply unhooking it, thereby placing in his hand an insulating manipulating handle that acts as a switch stick or fuse pole and thus acting, in effect, as aninherent safety device for the protection of the operator. 15

Further objects are to provide a housed type which is practical, which may be easily re-fused or otherwise easily handled.

Embodiments of the invention are shown in the 20 accompanying drawings, in which:-

Flgure 1 is a vertical sectional view showing one form of the invention, such view showing the, parts in operative position in full hues, and show-f1 ing, in dotted lines, successive positions, as the`25 fuse drops out.

Figure 2 is a sectional view on the line 2-2 of Figure 1.

Figure 3 is a bottom view of the construction shown in Figure 1. 30 Figure 4 is a fragmentary view of the lower part of the device, such view being similar to Figure 1, but with the fuse tube and door removedfor the sake of clearness.

Figure 5 is a vertical sectional view, with parts 35 broken away, sho'wing a modified form of the invention, such view showing, in dotted lines, the fuse in its lowermost position and in the position it assumes during removal or replacement. such view further showingin dotted lines, posi.` 4o tions assumed by the door when the fuse tube is being manipulated.

Figure 6 is a fragmentary face view of the lower portion of the door, of the type shown in Figure 5. i 45 Referring to the drawings, particularly Figures l, 2, 3, and 4, which show o ne form of the invention, it will be seen that a casing I of porcelain or similar material is provided with a door 2 which may be of a phenol condensate compound, 50 or other suitable insulating material. This door is pivotally mounted, as indicated at 3, adjacent its upper end and is provided with an inwardly extending upper portion ending in a at cam face 4. 55

vIhis projecting portion is adapted to depress a holding spring ii which is a relatively heavy leaf spring supported :from the lupper terminal member t of the casing and the ilat face d is adapted to engage the upper face of the spring 'd when the door is rocked to an approminately horizontal position, as indicated in the dotted lines in the upper portion of Figure l, to thereby hold the door open and extend it outwardly from the casing. The, casing is provided with the upper terminal member E mentioned hereinabove and the lower terminal member l, and is preferably provided with a barrier @which may be integrally formed and which is located intermediate the upper and lower terminals. These upper and lower terminals respectively carry brush contacts 9 and it which constitute yielding stationary contact members and respectively engage the spaced contacts il and i2 carried adjacent the upper and lower portion of the expulsion fuse tube it. The upper terminal member of the casing also carries a forwardly projecting stop ld' which when the :fuse is in its operative position, as shown in full lines in Figure l, is located. above the upper contact il of the fuse and is adapted to resist the upward pressure due to the reaction of the fuse when the fuse blows.

It is to be noted further from Figure l that the fuse tube carries an intermediate collar or block l5 to which the lower contact l2 oi the fuse is pivoted. This lower contact i2 in reality is a pivoted link or lever which has a biiurcated upper end provided with ears l t pivoted, as indicated at ll, on opposite sides of the block it.

This link l2 is provided with a thumb nut lil which clamps the fuse link lil, joining the upper and lower contacts in the usual manner, to the lever l2 and thus retains the lever in the position shown in full lines in Figure l until the fuse link is ruptured, at which time the contact lever i2 and the fuse tube lil may have relative motion. This contact lever l2 is provided with trunnions dll which nt within the hook-shaped hinge inembers 2l such hinge members being provided with inwardly projecting stops 272, see Figures i, 3, and 4, which are engaged in the iinal downward inotion of the mechanism by the laterally projecting reet or bottom ears of the Contact lever ii?.

The door 2 is provided with an inwardly projecting portion 253, see Figure 3, which carriers a locking plate or catch 25. The collar or block i5 carried by the fuse tube carries 'forwardly projecting spring arms it, each of which is provided with an inwardly 'turned portion 2l. These inwardly turned or bent portions snap over the projecting ends of the latch plate 25 and thus temporarily lock the fuse tube to the door. However, it is to be noted that when the fuse blows, the joint action of the latch plate 25 and the portions 2l of the spring arms 2t guide the fuse tube with reference to the door when the fuse tube moves downwardly after blowing of the fuse. lf desired, these spring arms may be formed of a strap or band, as indicated in Figure 3, which surrounds the block lo. @bviously when the fuse is in place, the door :may be closed or opened by exerting suficient pressure on the door, preferably by. catching it with a switch stick or fuse stick adjacent the lower projecting portion, such portion constituting a rounded lower end 2t, see Figure l. Obviously, the door may be closed by merely pressing it inwardly, the spring arms 26 being spread by the plate 25 and snapping back into locking position as shown in Figure 3.

accept/a Additionally, it is to be noted that when the contact lever l2 is released by the blowing of the fuse linlr ld, that the door and fuse tube both roch outwardly, as shown in Figure l, and the spring arms 2S slide downwardly out of. engagement withthe latching plate 2.5,, the fuse nnally rocking to the lower dotted line position and the door rocking towards closed position.

The upper contact of the fuse is provided with a pair of projecting ears 29, seo Figures 1 and 2, which are provided with slanting cani faces on their front and rear sides. These ears slide in between the inturned portions 3d of upper spring arms 3l carried by the upper 'terminal member t. As may be seen :from Figures l and 2, the

inner ends of these inturned portions dt of the spring arms are provided with downwardly and forwardly slanting :faces which are positioned in iront of the ears. @il when the fuse is in operative position, as shown in Figures l and 2.' l-loW- A ever, when the lower end of the fuse rocks outwardly, due to the release of the contact lever l2 by the rupturing of the fuse link, the imc may slide downwardly with respect to the arins and may thus disengage itself from the upper latching rneans. @bviously when a new fuse is put into operation, it is merely necessary to roel: it into vertical position after having hooked the trunnions 2li into the hinge supporting members 2l, the spring arms 3l spreading and allowing the ears 29 to snap back of the inner faces 32 of the inturned portions till, see Figure 2. Y

It is apparent, therefore, that the door may be opened or closed independently of the fuse and that the fuse, when the fuse link is blown, will drop downwardly and outwardly, the door swinging outwardly and allowing the discharge of the fuse tube and subsequently swinging towards closed position. lit is sometimes necessary to remove the fuse tube manually. This is readily accomplished by providing spreading means consisting of a pivoted lever having an upper cam portion 33 and a lower hoolrlike portion 3d adapted to he engaged by a switch stick to thereby roclr the cam portion downwardly. This cani portion 33 or spreading portion is provided with cam faces which engage the inwardly projecting portions d@ ci the upper spring arms and thereby spread such arms. bviously, when the hook of a switch stick is hooked into the hook-shaped portion ll of the spreader or releasing means, the cam portion is rocked downwardly, thereby releasing the upper end of the fuse, and continued pulling on the switch stick will rock the upper end oi the fuse outwardly clear of the upper spring arms.

The :fuse may be removed by unhooking the trunnions 2S from the hinge means d i see Figures l and 4, it being noted that the hinge means is electrically dead when the fuse is opened as it is distinct and separate from both stationary contacts and as the contact lever i2 is moved out of engagement with the stationary contact lli.

lt is tobe noted particularly that the yielding contact members il and l@ are deflected or tensioned when the :fuse tube is in closed position, as shown iniull lines in Figure l, and that, therefore, they exert a spring pressure against the fuse tube which supplements the action of gravity and biases the fuse tube towards open position. In addition to this, they iollow their respective contacts il and l2 of the fuse tube outwardly a material distance at the initiation of the outward dropping motion of the fuse tube and thus maintain electrical contact for a material interval of time so that the fuse tube will completely clear itself before the contacts are broken, thus avoiding arcing at the stationary contacts.

It is to be noted that the spring 5, see Figure l, which locks with the dat face 4 of the door, materially assists a lineman in manipulating the fuse, as in re-fusing or during inspection, as it holds the door in its open position and allows free access to the interior of the casing.

The device may take otherforms. For example as shown in Figure 5, the casing 36 may be provided with upper hocklike hinge means 31 which receive the pivot pin 38 carried by the upper portion of the door 39. 'I'he fuse tube 40 is provided with the intermediate block 4I and with the lower4 contact lever 42 which engages the lower brush contact 43, as previously described, and which is held in place by the fuse link 44.

This lower contact lever 42 is providedwith trunnions 45 which are removably received within the lower hinge member 46 and may be detached therefrom when the fuse has dropped to open position. 4

Similarly to the form previously described, the door may be provided with a latch plate 41 which is received between the spring arms 48 carried by the collar 4I as previously described.

The upper contact 49 of the fuse tube engages the upper stationary contact 50 of the casing in a manner similar to that previously describedand is provided with ears 50 which fit behind the slanting faces 5l of the upper spring arms 52 similar to the previously described forni. However, this upper contact member is provided with a forwardly directed hook or ear 53 which is upwardly directed when the fuse is in its operative position, as shown in full lines in Figure 4.

The door 39 is detachable from the casing, as described, and is provided with a lower projecting portion which constitutes a handle and is formed with a pair of outwardly projecting ribs 54, most clearly shown in Figure 6. These ears are joined at their outer ends by a rounded web 55 which conforms approximately to the curvature of the fuse tube. Further, this projecting handle portion is provided with a slot or opening 56 which is preferably provided with a bevelled face 51.

This door, it will be noted, isl freely removable from the casing by merely pulling it outwardly and thereafter unhooking the upper 'trunnions or pin 38 from the upper hook member 31 of the casing. Thereafter the door is reversed and the projecting portion is employed to engage the upper contact of the fuse and to spread the spring arms 52. y

This is accomplished by hooking such projecting portion of the door over the hook 53. as shown in the upper dotted line position for-the door in Figure 5, the hook 53 of the upper contact of the fuse passing into the opening 55. The door is then rocked upwardly and the projecting portion enters between the spring arms 52 and spreads them in the same manner that the cam portion 33 spreads the spring arms of that form of the invention. Thereafter the door is merely pulled forwardly. thereby pulling the upper end of the fuse forwardly and the fuse is rocked down to its outward position.

The door is now unlocked from the hook 53, placed-below the tube, andthereafter re-engaged with the hook 53, as shown in dotted lines in Figure 5.

It will be seen that the fuse tube body rests upon the web 55' and the extreme upper portion of the contact of the fuse rests between the webs 54, while the hook portion 53 is interlocked with the door. 'Ihe fuse may thereafter be lifted bodily upwardly and unhooked from the lower hinge members 46.

'I'he fuse may be re-fused and replaced by the use of the door and thereafter the door is unhooked from the fuse tube and isused to push the fuse tube into closed position. Subsequently the door is itself hooked on its hinge supporting means 31 and rocked to closed position.

It is to be particularly noted that in this form of the invention the door itself, formed of insulating material, constitutes the switch stick or fuse stick and is used in the manipulation of the fuse so that the fuse can be opened, removed, or replaced by means of the door without requiring the lineman to carry a separate switch stick.

In addition to this, there is a further safety feature with this form of the invention in that the lineman is practically compelled to remove the e door in order to get at the fuse, as he would otherwise have to hold the door up with one hand whenever he attempted to reach the fuse. It is thus a reminder to the lineman that he must remove the door and thereafter he nds himself with a fuse stick in his hands with which he can remove or manipulate the fuse.

Further than this, the projecting portion of the door forms a manipulating handle for the door itself in opening or closing the door. y

When the fuse blows, the lower end moves outwardly, thereby rocking the door outwardly and slips downwardly, thereby detaching'itself from the door, as previously described, and subsequently rocks downwardly, the door thereafter swinging to closed position and protecting the interior of the casing.

In this form of the invention no stops are employed in the hook supporting means 46 and the fuse tube swings downwardly into a vertical position, as indicated in dotted lines in Figure 5. Obviously either form of the invention can provide for the complete downward swinging of the fuse tube as described in connection with the form shown in 'Figure 5, or stops may be provided, as described in connection with the form shown in Figure 1. The door may either partially close or may be completely closed, as described in the two forms of the invention. Under all conditions, however, the fuse drops out from the casing in the manner described and the door moves towards closed position, thereby substantially closing the housing in the one case and fully closing the housing in the other, though either form may be employed with either of the two forms shown.

1t win be seen that the construction is simple and is practical and that the fuse is wholly reliable in operation.

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 housed type of drop-out fuse comprising a casing having stationary contacts, a door for said casing, a fuse tube movable outwardly to inoperative position and having spaced ccntactsengaging said stationary contacts when said fuse tube is in operative position, a fuse link nonnally electrically joining said spaced contacts, mechanism normally holding said fuse tube in operative position and releasable when s'aid fuse link 75 blows, and means independently supporting said door and fuse tube from said casing, a portion at least of said door being located in the path of travel of said fuse tube, said fuse tube when said fuse blows. moving to inoperative position and moving said door outwardly during a part at least of the motion of the fuse tube to inoperative posin tion, said door being pivotally supported above its center of gravity, whereby said door will tend to close after said fuse tube has moved to inoperative position,

2. A housed type of drop-out fuse comprising a casing having stationary contacts, a door hinged adjacent its upper end to said casing, a iuse tube hinged adjacent its lower end to said casing and adapted to move downwardly and outwardly from said casing and from said door, the lower portion of said door being located in the path of travel oi said fuse tube, said fuse tube having spaced contacts normally engaging said sta= tionary contacts and having a fuse link electrically joining said spaced contacts, and releasable mechanism controlled by said fuse link for holding said fuse tube in normal position, said fuse tube upon blowing of said fuse moving said door outwardly during a part at least of the motion of said fuse tube towards inoperative position, the hinged portion of said door being above the center of gravity of said door, whereby said door is biased towards closed position and tends to close after said fuse tube has moved downwardly and outwardly.

3. A housed type of drop-out fuse comprising a casing having stationary contacts, al door hinged adjacent its upper end to said casing, a' fuse tube hinged adjacent its lower end to said casing and adapted to move downwardly and outwardly from said casing and from said door, said fuse tube having spaced contacts normally engaging said stationary contacts and having a fuse link electrically joining said spaced contacts, releasable mechanism controlled by said fuse link for holding said fuse tube in normal position, the hinged portion of said door being above the center of gravity of said door, said door being biased towards closing position and tending to close after said fuse tube has moved downwardlyl and outwardly, the lower portion of said door being located in the path of travel of said fuse tube, said fuse tube upon blowing of said fuse moving said door outwardly through a portion at least of the travel of said fuse tube towards inoperative position, said door being normally movable to an elevated position, and means for releasably holding said door in elevated position.

4. A housed type of drop-out fuse comprising a casing having stationary contacts, a fuse tube having spaced contacts and having a fuse link electrically joining said spaced contacts, hinge link mechanism adjacent the lower part of saidfuse tube for supporting said fuse tube from said casing and for guiding said fuse tube outwardly and downwardly, said mechanism being normally restrained by said fuse link, latch means normally holding the upper end of said fuse tube against outward motion, and a door hingedly supported adjacent its upper end from said oasingkthe lower portion of said door being located at the path of travel of said fuse tube, said fuse tube moving said door outwardly through a portion at least of the motion of said fuse tube to inoperative position, said door being biased towards closed position and moving towards closed position after said fuse tube has completed its travel towards inoperative position, 1

i, apodera mally holding the upper end of said fuse tube against outward motion, and al door hingedly supported adjacent its upper en d from said casing, the hinged portion of said door being above the center oi' gravity of said door, said door tending to swing closed after said fuse tube has moved to its down position, the lower portion of said door being located in the path of travel of said fuse tube, and said fuse tube releasing itself from said latch means by a downward. motion and moving said door outwardly through a portion at least of the travel of said fuse tube towards inoperative position.

6. .A housed type of drop-out fuse comprising a casing having stationary contacts, a fuse tube having spaced contacts and having a fuse link electrically joining said spaced contacts, hinge link mechanism adjacent the lower part of said fuse tube for supporting said fuse tube from said casing and for guiding said fuse tube outwardly and downwardly, said mechanism being normally restrained by said fuse link, latch means normally holding the upper end of said fuse tube against outward motion, a door hingedly sup ported adjacent its upper end from said casing, and means operable independently of the action of said fuse for releasing said latch means. i

7. A housed type of drop-out fuse comprising a casing having stationary contacts, a door hinged to said casing, a fuse movably supported from said casing and having spaced contacts e1ectri1 cally joined by a fuse link, said fuse being movable from said casing and being restrained from movement by said fuse link, latch means normally holding 'said fuse with the spaced contacts in engagement with said stationary contacts and including spring fingers, said door being movable outwardly without disturbing said fuse tube, and means for spreading said spring fingers, whereby said fuse tube may be manually moved to open position.

8. A housed type of drop-out fuse comprising a casing having stationary contacts, a door hinged to said casing, a fuse movably supported from said casing and having spaced contacts electrically joined by a fuse link, said fuse being movable from said casing and being restrained from movement by said fuse link, latch means normally holding said fuse -with the spaced contacts in engagement with said stationary contacts and including spring lingers, said door being movable outwardly without disturbing said fuse tube, and means for spreading said spring ngers, whereby said fuse tube may be manually moved to open position, the spreading means being .carried by 'said fuse tube.

outwardly without disturbing said fuse tube, and a housing having stationary contacts, a fuse means for spreading said spring ngers, whereby said fuse tube may be manually moved to open position, the spreading means being pivotally mounted on said fuse tube and including a cam member adapted to be rocked between said spring lingers.

10. A housed type ot drop-out fuse comprising a casing having stationary contacts, a door hinged to said casing, a fuse movably supported from said casing and having spaced contacts electrically joined by a fuse link, said iuse being movable from said casing and being restrained from movement by said fuse link, latch means normally holding said fuse with the spaced contacts in engagement with said stationary contacts and including spring iingers, said door being movable outwardly without disturbing said fuse tube, and means for spreading said spring fingers, whereby said fuse tube may be manually moved to open position, the spreading means being carried by said door.

11. A housed type of drop-out fuse comprising a casing having stationary contacts, a' door hinged to said casing, a fuse movably supported from said casing and having spaced contacts electrically joined by a fuse link, said fuse being movable from said casing and being restrained from movement by said fuse link,` latch means normally holding said fuse with the spaced contacts in engagement with said stationary contacts and including spring iingers, said door being movable.

outwardly without disturbing said fuse tube, and means for spreading said spring ngers, whereby said fuse tube may be manually moved to open position, said door being formed of insulating material and having the spreading means formed as a unitary part of said door.

12. In a housed fuse, a casing having stationary contacts, a fuse tube having spaced contacts and having a fuse link electrically joining said spaced contacts, means for releasably holding said fuse tube in position with the spaced contacts engaging the stationary contacts, and a door for said casing, said door being detachable from said casing and having means for releasing said fuse tube after said door has been detached from said casing.

13. In a, housed fuse, a casing having stationary contacts, a fuse tube having spaced contacts and having a fuse link electrically joining. said spaced contacts, means for releasably holding said fuse tube in position with the spaced contacts engaging the stationary contacts, and a door for said casing, said door being detachable from said casing and having means for releasing said fuse tube and for interlocking with said fuse tube after said door has been detached from said casing, whereby said door constitutes a fuse stick for manipulating said fuse tube.

14. A housed type of drop-out fuse comprising a casing having stationary contacts, a fuse tube having spaced contacts and having a fuse link electrically joining said spaced contacts, mechanism adjacent the lower portion of said fuse tube for normally supporting said fuse tube, said mechanism being normally restrained by said fuse link, a door movably related to said casing, and means carried jointly by said door and said fuse tube for slfidably connectingxsaid fuse tube and door, whereby said fuse tube slides with-respect to said door during at least a part oi?l the travel of said fuse tube towards inoperative position upon blowing of said fuse.

15. A housed type of drop-out fuse comprising tube assembly including pivotally mounted supporting means and a fuse tube carried by said supporting meansvand movablewith respect to said supporting means, said fuse tube assembly having spaced contacts normally engaging said stationary contacts, said fuse tube assembly be` ing movable outwardly from operative to inoperative position, a fuse link carried by said fuse tube electrically connecting said spaced contacts and normally restraining said fuse tube assembly from moving from operative to inoperative position, and a door for said housing pivotally supported from said housing independently oi.' said supporting means and arranged in the path of travel of said fuse tube assembly from operative to inoperative position, whereby said door will be moved towards open position while said fuse tube assembly is moving towards inoperative position.

16. vA housed type of drop-out fuse comprising a housing having terminal members, a fuse tube assembly including a fuse tube and supporting means pivotally supported from said housing and movably supporting said fuse tube, said fuse tube assembly being movable from closed position to open position outwardly from said housing, a fuse link carriedby said fuse tube electrically connecting said terminal members and normally holding said fuse tube assembly against opening movement, and a door supported from said houswhile said fuse tube assembly is moving towards inoperative position.

17; A housed'type of drop-out fuse construction comprising a housing having terminal members, a fuse tube assembly including a fuse tube and supporting means pivotally carried by said housing and movably holding said fuse tube, a i'use link carried by said fuse tube electrically connecting said terminal members and normally holding said fuse tube against motion with respect to said supporting means, said construction including latch means normally latching said fuse tube assembly in closed position, lsaid fuse tube assembly freeing itself from said latch means as said fuse tube moves with respect to said supporting means, and a door supported from said housing independently of saidsupporting means and at a point remote from the pivot point of said supporting means, said door being arranged in the path of travel of said fuse tube assembly from. operative to inoperative position, whereby said door will be moved towards open position while said fuse tube assembly is moving towards inoperative position.

18. A housed type of drop-out fuse construction comprising a housing having terminal members,*a fuse tube assembly including a fuse tube `spect tosaid supporting means, said construction including latch means normally latching said fuse tube assembly in closed position, said fuse tube assembly freeing itself from said latch means as said fuse tube moves with respect to said supporting means, and a door pivotally supported from wid. housing independently of seid u Y rooting device comprising a, casing having stosupporting means and et e, point above tbe `pivot pointof seiszi .supporting means, seid door being arranged in the path of travel of seid fuse tube assembly from operative to inoperative position, whereby said door will be moved towards open position while seid fuse tube assembly is moving,

towards inoperative positione 19. A housed type of drop-out circuit intenz rupting device comprising e cosine having stefl tionelry contacts, e door for seid casing, en eroineq tube movable downwardly to inoperative position, len expulsble conductor in said orcing tube norinaliy establishing electrical. connection betweenl seid stationery contacts, end current responsive ineensl for releasing said eroine tube when said circuit interrupting device is subjected to en overload, seid door being positioned in the beth of movement of said ercing tube when said ercing tube moves from operative to inoperative position whereby seid door will be moved towards open position while seicl eroine tube :is moving towards inoperative positionu entente 2o. i housed type of drop-out circuit inter= tionery contacts, e, door for said casing, en arcing ltube movable downwardly to inoperative position, en expulsible conductor in said arcing tube normally establishing electrical connection be" tween seid stationary contacts, and current re-u sponsive means for releasing seid eroine tube when seid circuit interrupting device is subjected to en overiosd, seid door being positioned in the path oi movement of seid, eroine tube when said eroine' tube moves from operative to inoperative position whereby seid door will be moved towards open position wiiiie seid arcing tube is moving towards inoperative position, said door being pivvoteoi independently of seid arcing tube and swinging towei'cis closed position after said eroine tube has moved to inoperative position.

ALWIN G. SEHR/ILAYER. VTILLIAM O., SCHULTZ.

Images