CA1311786C - Electrical cut-out device - Google Patents
Electrical cut-out deviceInfo
- Publication number
- CA1311786C CA1311786C CA000601203A CA601203A CA1311786C CA 1311786 C CA1311786 C CA 1311786C CA 000601203 A CA000601203 A CA 000601203A CA 601203 A CA601203 A CA 601203A CA 1311786 C CA1311786 C CA 1311786C
- Authority
- CA
- Canada
- Prior art keywords
- fusible link
- passageway
- out device
- terminals
- electrical cut
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
ABSTRACT OF THE DISCLOSURE
A horizontally mounted electrical cut-out device is provided. The device includes an insulator electrically isolating a pair of terminals and a fuse assembly comprising a fuse carrier housing a fuse element removably connected between the terminals. The fuse assembly is pivotally connected at one end to one of the terminals to allow the other end of the fuse assembly to engage with the other terminal when the fuse assembly is pivoted. The pivotal connection with the one terminal and the engagement with the other terminal is such so as to permit the fuse assembly to drop automatically to an open position following an interruption resulting from an overload or fault thereby establishing an opencircuit condition. This increases safety and provides a visible indication of the open circuit condition. A latch is provided on the other terminal to engage releasably the other end of the fuse assembly to maintain the electrical connection between the two terminals.
Doc. #21709
A horizontally mounted electrical cut-out device is provided. The device includes an insulator electrically isolating a pair of terminals and a fuse assembly comprising a fuse carrier housing a fuse element removably connected between the terminals. The fuse assembly is pivotally connected at one end to one of the terminals to allow the other end of the fuse assembly to engage with the other terminal when the fuse assembly is pivoted. The pivotal connection with the one terminal and the engagement with the other terminal is such so as to permit the fuse assembly to drop automatically to an open position following an interruption resulting from an overload or fault thereby establishing an opencircuit condition. This increases safety and provides a visible indication of the open circuit condition. A latch is provided on the other terminal to engage releasably the other end of the fuse assembly to maintain the electrical connection between the two terminals.
Doc. #21709
Description
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The present invention relates to fuses and in particular to an electrical cut-out deYice.
Blectrical cut-out devices are used to provide fusible connections in high voltage power lines in order to break the electrical connection between a pair of power lines when an overload occurs.
Typically, the cut-out devices are veItically mounted to a utility pole and comprise an insulator electrically isolating upper and lower terminal assemblies receiving the power lines. A cylindrical fuse carrier having an arc quenching liner houses a fuse element and extends between the terminals in parallel with the insulator. A pivotal connection for the fuse carrier is usually provided in the lower terminal assembly and typically is in the form of a shallow downwardly extending slot to allow the fuse calrier to be engaged releasably to the lower terminal assembly. The fuse carrier, when positioned in the slot, can ~hen be swung upwards to engage with the upper terminal assembly, thereby fiorming an electrical connection between the power lines.
When a current overload occurs, the fuse element and the arc quenching liner vapoAze to break the electncal connestion between the upper and lower terminal assembIies. The vapo~ized element and liner create a large internal pressure in ~he fuse carrier and are forced out of the lower end of the fuse carner.
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However, since ~he lin~r and fuse element vapour are discharged downwardly, the possibility of injuring a passerby or damaging equipment loca~ed beneath the cut-out dsvice is of soncern. Also, since the fuse carrier is seated in a shallow slot, the fuse carri~r may disengage from ~; .
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the slot when the fuse carrier disengages from the upper terminal assembly and swings downwardly after an overload occurs.
The horizontal mounting of cut-out devices has been S considered. In particular, IJ.S. patent 2,113,632 to Steinmayer shows a horizontally mounted, low voltage cut-out device including a ~use carrier connec~ed across a pair of terminal assemblies. To facilitate the connection, one of the terminals is provided wish a horizontal slot having a pair of upwardly extending hooks fonning an open outer end. The outer end of the slot receives the filse carrier allowing it to be slid towards the terminating end of the slot and pivoted so that the other end of the fuse carrier can be bolted to the other terminal assembly in order to complete the circuit between the power lines.
However, a proWem exists in that the filse carrier is not easily disengaged from the other terminal assembly and thus, the time required to replace the fuse element housed in the fuse earrier is increased. Another problem exists in the Steinmeyer device in ~at although the provision of the honzontal slot pe~nits the fuse carrier to slide longitudinally along the slot, the user is required to bias the fuse carrier against the terminating end of thehorizon~al slot when pivoting the fuse carrier in order to connect the other end of the fuse carrier with ~he other terrninal assembly. Thus, the slot fails to aid in posi~ioning the ~use carrier when pivoting for engagemen~
across the terminal assemblies and to locate the fuse carrier securely to 2S withstand ~e for~ imposed in service. Moreover, another problem exists in that ~he Steinmayer device c~not be re-fused wlth the power lines energiæd. Accordingb, ~ere is a need ~or an improved electrical cut-out device.
The present invention relates to fuses and in particular to an electrical cut-out deYice.
Blectrical cut-out devices are used to provide fusible connections in high voltage power lines in order to break the electrical connection between a pair of power lines when an overload occurs.
Typically, the cut-out devices are veItically mounted to a utility pole and comprise an insulator electrically isolating upper and lower terminal assemblies receiving the power lines. A cylindrical fuse carrier having an arc quenching liner houses a fuse element and extends between the terminals in parallel with the insulator. A pivotal connection for the fuse carrier is usually provided in the lower terminal assembly and typically is in the form of a shallow downwardly extending slot to allow the fuse calrier to be engaged releasably to the lower terminal assembly. The fuse carrier, when positioned in the slot, can ~hen be swung upwards to engage with the upper terminal assembly, thereby fiorming an electrical connection between the power lines.
When a current overload occurs, the fuse element and the arc quenching liner vapoAze to break the electncal connestion between the upper and lower terminal assembIies. The vapo~ized element and liner create a large internal pressure in ~he fuse carrier and are forced out of the lower end of the fuse carner.
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However, since ~he lin~r and fuse element vapour are discharged downwardly, the possibility of injuring a passerby or damaging equipment loca~ed beneath the cut-out dsvice is of soncern. Also, since the fuse carrier is seated in a shallow slot, the fuse carri~r may disengage from ~; .
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the slot when the fuse carrier disengages from the upper terminal assembly and swings downwardly after an overload occurs.
The horizontal mounting of cut-out devices has been S considered. In particular, IJ.S. patent 2,113,632 to Steinmayer shows a horizontally mounted, low voltage cut-out device including a ~use carrier connec~ed across a pair of terminal assemblies. To facilitate the connection, one of the terminals is provided wish a horizontal slot having a pair of upwardly extending hooks fonning an open outer end. The outer end of the slot receives the filse carrier allowing it to be slid towards the terminating end of the slot and pivoted so that the other end of the fuse carrier can be bolted to the other terminal assembly in order to complete the circuit between the power lines.
However, a proWem exists in that the filse carrier is not easily disengaged from the other terminal assembly and thus, the time required to replace the fuse element housed in the fuse earrier is increased. Another problem exists in the Steinmeyer device in ~at although the provision of the honzontal slot pe~nits the fuse carrier to slide longitudinally along the slot, the user is required to bias the fuse carrier against the terminating end of thehorizon~al slot when pivoting the fuse carrier in order to connect the other end of the fuse carrier with ~he other terrninal assembly. Thus, the slot fails to aid in posi~ioning the ~use carrier when pivoting for engagemen~
across the terminal assemblies and to locate the fuse carrier securely to 2S withstand ~e for~ imposed in service. Moreover, another problem exists in that ~he Steinmayer device c~not be re-fused wlth the power lines energiæd. Accordingb, ~ere is a need ~or an improved electrical cut-out device.
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It is therefore an object of the pres~nt invention to obviate or mitigate the above disadvantages.
According to one aspect of the present invention there is provided an electrical cut-out dsvice for electrically connecting a pair of power lines interconnected by a substantially horizontally mounted insulator cornprising:
a pair of conductive terminals each for receiving one o~ said power lines, each of said terminals including securing means on one end thereof, said securing means securing each of said terminals to one end of said insulator so that said terminals extend downwardly therefrom to define outwardly and inwardly facing sides, one of said terminals having a passageway formed therein having an o~en end in the outwardly facing side ~reof, said passageway extending steeply downwards from said open end when said one terminal is extending downwardly ~rom said insulator, said passageway being shap~d at the other end thereof to define a bearing surface;
releasable latch means located on the other of said terminals;
and a ~usible link connectaUe in a substantially horiz~ntal operative position between said one and other terminals to connect elec~ically said tem~inals, one end of said filsible link including means for slidably engaging in said passageway when said means is aligned with said open end, said fi~ le link being pivotal in said passagew~y when said means is positioned at the othe~ end of said passageway to engage releasably 1he other end of said fusible link with said latch means.
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According to another aspect of the present invention there is provided a generally horizontally mounted electrical cut-out device comprising:
an insulator for interconnecting a pair of power lines;
S a pair of conductive terminals each for receiving one of said power lines, each of said terminals extending downwardly from one end of said insulator and defining outwardly and inwardly facing sides, one of said terminals having a steep, downwardly extending passageway formed the~ein, said passageway including an open end formed in the outwardly facing side and being shaped at the other end there~>f to define a bearing surface;
releasable latch means located on the other said terminals; and a fusible link connectable in a substantlally hori~ontal operative position between said terminals to connect electrically said terminals and one of said fusible link including means for slidable engaging in said passageway when said means is aligned with said open end, said fusible link being pivotal in said passageway when said means is positioned at the other end of said passageway ~o engage releasably the other end of said fusible link with said latch means.
Preferably, ~e passageway is steeply angled relative to the longitudinal a~cis of the ~usible link to prov;de an abutment surface to inhibitlongitudinal movement of the fusible link when it is connected across the terminals. The provision of the steeply angled passageway also provides a bias for ~e filsible link perpendicular to the longitudinal ~xis of the fosible link to maintain the fusible linlc in the passageway when the fusible link is disengaged from ~he latch means. Furthe~more, it is also preferred th~t the fusible link is pro~ided wi~ a cam surface at the one end and the one tenninal is provided with a~resilient Tetainer such ~at upon pivotal , . .
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movement of the fusible link to engage the other end of the filsible link with the latch means, the one end of the fusible link contacts the resilient retainerand is biased in a direction along the axis of the fusible link towards the latch means.
s These features allow the present device to be mounted horizontally on a utility pole or positioned in an in-l;ne condition to increasesafety in the event of an arc quenching liner and fuse element vapour discharge while facili~ating the removal and engagement of the filsible link across the electrically isolated terminals.
Embodiments of the present invention will now be described more fully with reference to the accompanying drawings in which:
Figure 1 is a side view of an elect~ical cut-out device;
Figure 2 is an enlarged side view par~y in section of a portion of the device illustrated in Figure l;
Figure 3 is an enlarged side view partly in section of another portion of the device illustrated in Figure l;
Figure 4 is ar~ enla~ged rear view of the portion illust~at~d in Figure 3;
Figure S is another enlarged side view l?artly in section of the po~on illustrated in ~igure 3;
Figur~ 6 is a side view OI t}~e device shown in Figure 1 in an in-line condition; and l~igure 7 is a partial perspective view of the device shown in Figure 1 in a pole mount condition.
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Referring to the Pigures, an electAcal cut-out device 10 is shown interconnecting a pair of power lines 12 and 14. The cut-out device 10 includes a pair of terminal assemblies 16 and 18 receiving the power lines 12 and 14. The terminal assemblies are mounted on opposite ends of an S insulator 20 which electrically isolates the power lines 12 and 14. A fuse assembly 22 extends between the terminal assemblies 16 and 18 to complete the electrical circuit between the two power lines 12 and 14 while functioning to interrupt the electrical circuit in the event of a current ov~rload.
The terminal assemblies 16 and 18 include aluminum brackets 24 and 26 secured at one end to opposite ends of the insulator 20 and projecting downwardly sufficiently from the insulator 20 to provide clearance between the fuse assembly 22 and the insulator 2û.
~: 15 The brac~cets 24 and 26 are secured to the lnsulat~r 20 by "U"-shaped bolts 28 and 30 and have curved lower surfaces 32 and 34 respectively, each lower surface being prwided with a tapped bore. The lower surface 32 is secured to the mating top surface 35 of a bifurcated coupling 36 ~ormed from co~per via a bolt 37 which threadably engages with the bore. The coupling 36 is tin coated in suitable areas ~o prsclude ths galvanic ~eaction between the copper coupling and the aluminum bracket.
The couRling 36 includes a pair of spaced side walls 36a, 36b and outwardly and inwa~dly facing sides 36g, 36h respectively. The interior surfaces of the side walls 36a and 36b are each p~ovide~ with a curved passageway 38a and 38b re~ec~ively, in the form of a channel with each passageway having an o~ening near ~e upper po~on of the coupling 36 in the outwardly facing side 36g of ~e coupling 36. Ihe passageways 38a,3gb serve to receive one .
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end of the fuse assembly 22 and are sufflciently deep to inhibit accidental disengagement with the fuse assembly.
The curved passageways 38a and 38b are inwardly and steeply S angled with respect to a horizontal axis and terminate in substantially ver~c~
poItions 40a and 40b positioned on the~ longitudinal axis of the coupling 36.
The vertical portions 40a and 4ûb are of sufflcient depth to provide bearing surfaces 42a and 42b for facili~ating rotation of the ~use assembly 22 and to provide abutment surfaces 44a and 44b for preventing movement of the fuse assembly 22 along its longitudinal axis when engaged aeross the two terminal assemUies 16 and 18. A curved resilient retainer 46 is secured at one end to the coupling 36 by the bolt 37 and is positioned between the two sides 36a and 36b of the coupling 36. This provides additional support to p~event movPment of the fuse assembly 22 along its longitudinal axis when engaged between the terminal assemblies in an operative position and forms an auxiliary electrical contact between the terminal assembly 16 and the fuse assembly 22. A securing plate 48 is removeably secured to one side of the coupling 36 by a nut and bolt 50 to allow the power line 12 to be pinned between the plate 48 and the coupling 36.
A copper latch housing is secured to t~e bracket 26 by a bolt 51 thr~adably engaged with the ~apped bore so tha~ the top surface 52 of the housing mates with the curv~d lower surface 34 of ~e bracket. The latch housing is also tin coated in suitable areas. The housing 54 has a pair of sidewalls 54a and 54b and a backwall 54c and supports the female portion 56 of a latch 58. The latch 58 ineludes a pair of curved resi1ien~ plates 60 and 62. The p~ate ~ is secured to a support 64 locate~ in the housing 54 by a .
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nut and bolt 66 and is biased towards and positioned to provide an abutment surface 68 capable of being displaced upwardly against the bias.
The other resilient plate 62 is secured at one end to the S backwall 54c by a connector 70 and is positioned below the plate 60. The plate 62 is suppor~d along a portion of its length by a support 72. The other end 74 of the plate 62 is disposed adjacent the plate 60 and is capable of being displaced towards the backwalll 54c agains~ the bias. The abutment surface 68 and the other end 74 are separated to pro~ide an aperture 76 for receiving the male poItion 78 of the latch 58 located on the fuse assembly 22. A second secunng plate 80 is removeably secured to the sidewall 54a by a nut and bolt 82 to allow the power .line 14 to be pinned between the plate 80 and the housing 54.
The fu~e assembly 22 comprises a cylindrical fuse carrier 84 having an inner arc quenching liner and is connected at one end 84a to a bifurcated connector 86. The connector 86 includes a pair hooked extensions 88 and 90 shaped to fonn a c~n surface 92 for co operation with the coupling 36 in a manner to be descnbed here;n.
: ~ The sides of the connector 86 are provided with outwardly e3ctending trunnions 94a and 94b. The trunnions 94a and 94b a~e positioned and dimensioned to engage slidably in the passageways 38a and 38b and to form a pivotal connechon between the ~use assembly 22 and the coupling 36.
Crossbars 96 and 98 int~rconnect the extensions 88 and 90. The ~ro~sbar 96 engages with the resilient retainer 46 when the fuse assembly 22 is pivoted in the coupling 36 to engage the fuse assembly 2~ with the terminal ~ assembly 18.
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The connector 86 is secured by a pivot pin to a bracket 10 formed on the fuse calTier 84 to define a hinge 100. The bracket 102 encircles the fuse carrier 84 and is secured thereto by a suitable fastener 104. l~e bracket 102 also includes a lif~ing ring 106 to ~aciLita~e removal and the pla ement of the fuse assembly from or on the coupling 36. The connect~r 86 terminates at its lower end to form an abutment member 110 which abuts against the open end 84a of the fuse carrier 84 when the fuse assembly is in an operative position. The hinge 100 is biased by a spring (not shown) in a direction to force the abutment member 110 away from the fuse carrier 84 when the memb~r 110 ls not restrained by a fuselink.
A male portion 78 of the latch 58 is secured to the other end 84b of the fuse carrier 84. The male portion 78 includes a housing 112 receiving the fuse carrier 84 and is secured to the carrier 84 by a suitable f stener 114. One end of the housing 112 is provided with threads to receiYe an end cap 116 which sea1s one end o~ the fuse carrie~ 84. A post 118 extends upwardly from the housing 112, the up~er surface of which defines an sngagement plate 120. The plate 120 is at a slight angle to the horizontal and is dimensioned to extend outwardly beyond the sides of ~e post 118, thereby exposing a portion of its undersu~face. The engagement plate 120 is also of a thickness greater than the separ~tion distance or aperture 76 formed between the two plates 60 and 62.
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The male portion 78 also insludes an arm 122 pivotally connected to the post 118 by a hinge pin 124. The arm 122 tenninate3 at one end in a pull nng 126 which is position~d below the fuse carIier 84 to facilitate access. The o~ end 128 af ~e arm 122 extends upwardly along side the post 118 and is bias~ thereagainst by a spring (not shown).
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A third securing plate 130 is removeably held against the abutment member 110 by a bolt 132 to allow one end of a fuse cable 134 to be sscurgd to the connector 86. The iùse cable 134 as is well known in the art, extends into the fuse carrier 84 and is coupled to one end of a fuse S element (not shown). TSle other end of the fuse element extends through the ~use carrier 84 to the other end thereo~F. The fuse element is held in electrical contact with the male po~tiosl 78 of the la~ch 58 by the end cap 116. The connection of the fuse cable 134 to the member 110 at one end and to the end cap 116 at ~e other end counters the bias of the hinge 100 which acts to force the abutment member 110 away from the fuse car~ier.
Thus, the fuse cable 134 when intact maintains the abutment member 110 against the open end 84a of the fuse carrier.
The connec~ion and operation of the cut-out device 10 will now be described. ~irstly, the terminal assemblies 16 and 18 of the cut-out deYice 10 are secured to either ends of the insulator 20 so that they depend there3From. The power lines 12 and 14 are then secured to the Iespective ~elminal assemblies 16 and 18 by the securing plates 48 and 80. Prior to connecting the fuse car~ier and fuss cable across the terminal assemblies 16 and 18, the end cap 116 is removed from the housing 112. The fuse element and fue cable 134 are in~ted into fuse ~er 84 so that the fuse cable extends beyond ehe open one end 84a and the fuse element abuts againæt the other end 84b of the fuse carrier 84. The end cap 116 is then threadably engaged with the housing 112 to secure ~e fuse element and cable 134 in the . ~ 25 fuse car~ier. The end of ~he filse cable 134 extending fr~m the open end 84a of the carner is then pmned to the abutment member 110 by the s~curing plate 130 which acts against the bias of the hinge 100 to hold the open end 84a against ~e member 110.
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With this complete, the fuse assembly 22 is held via the lifting sing 106. The lifting ring 106 is positioned relative to the centre of gravity of the fuse assembly 22 so that the fuse assembly 22 assumes a substantially vertical orientation. With the fuse assembly in this orientation, the assembly is positioned to bring the trunnions 94a a~nd 94b into alignment with the open end of the passageways 38a and 38b provided in the outwardly facing side 36g of the coupling 36. With the trumnions aligned, the fuse assembly 22 is slid downwardly so that the tmnnions 94a and 94b move along the passageways until they rest at the bottom of the passageways in the vertical sections.
The cam surface 92 defined by the extensions 88 and 90 allows the connector 86 to engage with the coupling 36 without eontacting the retainer 46 whilst perrnitting the crossbar 96 to contact the retainer 46 when tlle fuse assembly 22 is in a substantially horizontal orientation.
Moreover, the design of the extensions 88,90 and the passageways 38a,3~b only permits the trunnions 94a,94b to slide to the bottom of the passageways when the fuse assembly 22 is in a substantially vertical orientation. This prevents the fuse assembly 22 from mal~ng an electrical connection between the two terminal assemblies 16 and 18 when the fuse assembly 22 is not seated properly in the passageways.
When the trunnions 94a and 94b are seated at the bottom of the passageways, ~e fuse assembly 22 is swung upwardly. The depth of the vertical sections 40a and 40b provide ~ing surf~ces 42a and 42b and fa~ilitate the piYoting motion of the fuse assembly 22 by maintaining the position of the trunnions in the passageways. When fuse assembly 22 is swung upwardly, the outer edge the engagement plate 120 abuts against the `~
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1 7 ~ 6 other end 74 of the resilient plate 62 forcing it to move laterally into the housing 54 against the bias. VYhen this occurs, the engagement plate 120 is capable of further upward movement, thereby allowing the top surface of the plate 120 to abut against the abutment surface 68 of the plate 60 causing its displacement upwardly against the bias.
After the plate 60 has been displaced upwardly by a distance sufflcient to form an ap~rture 76 betwoen the plates 60 and 62 larger in size than the plate 120, the outer ed~e of ~he engagement plate 120 no longer biases the resili~nt plate 62 into the housing. This allows the resilient plate 62 to spring back towards the post 118 beneath the plate 120. When the upward force impos~d on the fuse assembly 22 subsides, the plate 60 forces the engagement plate 120 towards the lower plate 62. This action results in the plate 120 being held between the plate 62 and the surface 68 thereby securing the male portion 78 to the female por~on 56 and completing an elec~ical connection between the power lines 12 and 14 via the assemblies 16, 22 and 18.
To release the connection between the resilient plates 60 and 62 and the engagement plate 120, the pull ring 126 is pulled downward thereby pivoting the ann 120 via hinge 124. The pivo~ng action forces the o~er end 128 of the arm 120 to abu~ against ~ resilient platc 62 causing it to move laterally into the housing ~4. When ~he other end 128 of the ~rm has moved the plate 62 beyond the outer edge of the engagement plate 120, the filse assembly :22 is released ~rom the housing 54. With the filse assembly released ~om the terminal assembly 18, ~e assembly 22 swings : downwardly under the influence of gravit~ vh its pivotal connection with the terminal assembly 16. In this position, the fuse assembly 22 can be , - 12- .
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disengaged from the coupling 36 by engaging the lifting ring 106 and sliding the trunnions 94a and 94b upwardly through the passageways.
When the cut-out device 10 is connected across the power S lines and an overload occurs, the arc quenching liner and the fuse element vaporize and due to the increase in pressure within the fuse carner 84 are jettisoned outwardly through the open end 84a of the ~use carrier in the case of a low fault overload and outwardly through both ends in the event of a high fault overload if the internal pressure attained in the fuse carrier is sufflcient to blow out the end cap 116~
When the fuse element vapourizes, the tension in the fuse cable 134 is released. This allows the spring to force the abutment member 110 away from the end of the fuse carrier 84 via the hinge 100. As the member 110 and fuse caener are forced apart, since the trunnions 94a,94b remain seated in the bottom of the passageways 38a,38b, the connector 86 pivots within the passageways via the tmnnions which in turn swings the hinge 100 in an arc away from the terminal assembly 18.
The movement of the hinge 100 in this manner forces ~e plate 120 to slide relative to the two plates 60 and 62 and out of the aper~ure 76.
-~ When the plate 120 slides a sufflcient distance to clear the plate 62, the fuse assembly 22 becomes disengaged from the terminal assembly 18 and is free to swing downwardly via the pivotal connection with terminal assembly 16 under the in~uence of gravity. Since the passageways 38a,38b are sufficiently deep, there is lit~e or no chance of the fuse assembly 22 accidentally disengaging from~the termin21 assembly 16 as it swings.
Accordingly, since ~e fuse assembly 22 ~rees itself from the terminal ~ .
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assembly 18 when an overload occurs, the device 10 gives a vi~ual indication of the occurrence of a fault.
Referring now to Figures 6 and 7, the present cut-out device S 10 is shown in an in-line condition ancl in a pole mount condition. In the in-line conditicn illustrated in l~igure 6, tlhe device 10 interconnects the p~wer lines 12 and 14 as the lines span be~veen suitable utili~ SUppOItS. Howe~sr, as can be seen in Figure 7, the device 10 can also be mounted to a utility pole 200. When the device 10 is to be mounted in this fashion, a bracket 202 is secured to the insulator 20 via a "U"- bolt 2W. A mounting post 206 bolted to the utility pole extends ~rom the pole 200 and is bolted to the bracket 202. A power line 20$ is connected to the terminal assembly 16 in the manner described ab~ve and extends to a consumer location or transforrner. A second power line 210 extends from the te~minal assembly 18 to the overhead power lines. Thus, as can be seen ~e present de~ice is capable of operating in various environments.
The pressnt device provides advantages in that since the cut-out device 10 is mounted in a substantially honzontal position with respect to ~he ground, vapour is jettisoned from the ~use carrier 84 in a direction that precludes the possibility of damage to equipment or injury to a passerby.
Also, since the passageways 38a and 313b are sufflciently deep and steeply angied downwardly, the trurmions 94a and 94b ale maintained in position in the passageways when the fuse assembly swings downwardly after releasing from the terminal assembly 18. Purthermore, ~he abutment surfases 44a and 44b provide additional support for the ~unnions 94a,94b to inhibit m~vement of the fuse assembly 22 along its~ axis when in an operating posi~on.
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It is therefore an object of the pres~nt invention to obviate or mitigate the above disadvantages.
According to one aspect of the present invention there is provided an electrical cut-out dsvice for electrically connecting a pair of power lines interconnected by a substantially horizontally mounted insulator cornprising:
a pair of conductive terminals each for receiving one o~ said power lines, each of said terminals including securing means on one end thereof, said securing means securing each of said terminals to one end of said insulator so that said terminals extend downwardly therefrom to define outwardly and inwardly facing sides, one of said terminals having a passageway formed therein having an o~en end in the outwardly facing side ~reof, said passageway extending steeply downwards from said open end when said one terminal is extending downwardly ~rom said insulator, said passageway being shap~d at the other end thereof to define a bearing surface;
releasable latch means located on the other of said terminals;
and a ~usible link connectaUe in a substantially horiz~ntal operative position between said one and other terminals to connect elec~ically said tem~inals, one end of said filsible link including means for slidably engaging in said passageway when said means is aligned with said open end, said fi~ le link being pivotal in said passagew~y when said means is positioned at the othe~ end of said passageway to engage releasably 1he other end of said fusible link with said latch means.
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According to another aspect of the present invention there is provided a generally horizontally mounted electrical cut-out device comprising:
an insulator for interconnecting a pair of power lines;
S a pair of conductive terminals each for receiving one of said power lines, each of said terminals extending downwardly from one end of said insulator and defining outwardly and inwardly facing sides, one of said terminals having a steep, downwardly extending passageway formed the~ein, said passageway including an open end formed in the outwardly facing side and being shaped at the other end there~>f to define a bearing surface;
releasable latch means located on the other said terminals; and a fusible link connectable in a substantlally hori~ontal operative position between said terminals to connect electrically said terminals and one of said fusible link including means for slidable engaging in said passageway when said means is aligned with said open end, said fusible link being pivotal in said passageway when said means is positioned at the other end of said passageway ~o engage releasably the other end of said fusible link with said latch means.
Preferably, ~e passageway is steeply angled relative to the longitudinal a~cis of the ~usible link to prov;de an abutment surface to inhibitlongitudinal movement of the fusible link when it is connected across the terminals. The provision of the steeply angled passageway also provides a bias for ~e filsible link perpendicular to the longitudinal ~xis of the fosible link to maintain the fusible linlc in the passageway when the fusible link is disengaged from ~he latch means. Furthe~more, it is also preferred th~t the fusible link is pro~ided wi~ a cam surface at the one end and the one tenninal is provided with a~resilient Tetainer such ~at upon pivotal , . .
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movement of the fusible link to engage the other end of the filsible link with the latch means, the one end of the fusible link contacts the resilient retainerand is biased in a direction along the axis of the fusible link towards the latch means.
s These features allow the present device to be mounted horizontally on a utility pole or positioned in an in-l;ne condition to increasesafety in the event of an arc quenching liner and fuse element vapour discharge while facili~ating the removal and engagement of the filsible link across the electrically isolated terminals.
Embodiments of the present invention will now be described more fully with reference to the accompanying drawings in which:
Figure 1 is a side view of an elect~ical cut-out device;
Figure 2 is an enlarged side view par~y in section of a portion of the device illustrated in Figure l;
Figure 3 is an enlarged side view partly in section of another portion of the device illustrated in Figure l;
Figure 4 is ar~ enla~ged rear view of the portion illust~at~d in Figure 3;
Figure S is another enlarged side view l?artly in section of the po~on illustrated in ~igure 3;
Figur~ 6 is a side view OI t}~e device shown in Figure 1 in an in-line condition; and l~igure 7 is a partial perspective view of the device shown in Figure 1 in a pole mount condition.
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Referring to the Pigures, an electAcal cut-out device 10 is shown interconnecting a pair of power lines 12 and 14. The cut-out device 10 includes a pair of terminal assemblies 16 and 18 receiving the power lines 12 and 14. The terminal assemblies are mounted on opposite ends of an S insulator 20 which electrically isolates the power lines 12 and 14. A fuse assembly 22 extends between the terminal assemblies 16 and 18 to complete the electrical circuit between the two power lines 12 and 14 while functioning to interrupt the electrical circuit in the event of a current ov~rload.
The terminal assemblies 16 and 18 include aluminum brackets 24 and 26 secured at one end to opposite ends of the insulator 20 and projecting downwardly sufficiently from the insulator 20 to provide clearance between the fuse assembly 22 and the insulator 2û.
~: 15 The brac~cets 24 and 26 are secured to the lnsulat~r 20 by "U"-shaped bolts 28 and 30 and have curved lower surfaces 32 and 34 respectively, each lower surface being prwided with a tapped bore. The lower surface 32 is secured to the mating top surface 35 of a bifurcated coupling 36 ~ormed from co~per via a bolt 37 which threadably engages with the bore. The coupling 36 is tin coated in suitable areas ~o prsclude ths galvanic ~eaction between the copper coupling and the aluminum bracket.
The couRling 36 includes a pair of spaced side walls 36a, 36b and outwardly and inwa~dly facing sides 36g, 36h respectively. The interior surfaces of the side walls 36a and 36b are each p~ovide~ with a curved passageway 38a and 38b re~ec~ively, in the form of a channel with each passageway having an o~ening near ~e upper po~on of the coupling 36 in the outwardly facing side 36g of ~e coupling 36. Ihe passageways 38a,3gb serve to receive one .
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end of the fuse assembly 22 and are sufflciently deep to inhibit accidental disengagement with the fuse assembly.
The curved passageways 38a and 38b are inwardly and steeply S angled with respect to a horizontal axis and terminate in substantially ver~c~
poItions 40a and 40b positioned on the~ longitudinal axis of the coupling 36.
The vertical portions 40a and 4ûb are of sufflcient depth to provide bearing surfaces 42a and 42b for facili~ating rotation of the ~use assembly 22 and to provide abutment surfaces 44a and 44b for preventing movement of the fuse assembly 22 along its longitudinal axis when engaged aeross the two terminal assemUies 16 and 18. A curved resilient retainer 46 is secured at one end to the coupling 36 by the bolt 37 and is positioned between the two sides 36a and 36b of the coupling 36. This provides additional support to p~event movPment of the fuse assembly 22 along its longitudinal axis when engaged between the terminal assemblies in an operative position and forms an auxiliary electrical contact between the terminal assembly 16 and the fuse assembly 22. A securing plate 48 is removeably secured to one side of the coupling 36 by a nut and bolt 50 to allow the power line 12 to be pinned between the plate 48 and the coupling 36.
A copper latch housing is secured to t~e bracket 26 by a bolt 51 thr~adably engaged with the ~apped bore so tha~ the top surface 52 of the housing mates with the curv~d lower surface 34 of ~e bracket. The latch housing is also tin coated in suitable areas. The housing 54 has a pair of sidewalls 54a and 54b and a backwall 54c and supports the female portion 56 of a latch 58. The latch 58 ineludes a pair of curved resi1ien~ plates 60 and 62. The p~ate ~ is secured to a support 64 locate~ in the housing 54 by a .
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nut and bolt 66 and is biased towards and positioned to provide an abutment surface 68 capable of being displaced upwardly against the bias.
The other resilient plate 62 is secured at one end to the S backwall 54c by a connector 70 and is positioned below the plate 60. The plate 62 is suppor~d along a portion of its length by a support 72. The other end 74 of the plate 62 is disposed adjacent the plate 60 and is capable of being displaced towards the backwalll 54c agains~ the bias. The abutment surface 68 and the other end 74 are separated to pro~ide an aperture 76 for receiving the male poItion 78 of the latch 58 located on the fuse assembly 22. A second secunng plate 80 is removeably secured to the sidewall 54a by a nut and bolt 82 to allow the power .line 14 to be pinned between the plate 80 and the housing 54.
The fu~e assembly 22 comprises a cylindrical fuse carrier 84 having an inner arc quenching liner and is connected at one end 84a to a bifurcated connector 86. The connector 86 includes a pair hooked extensions 88 and 90 shaped to fonn a c~n surface 92 for co operation with the coupling 36 in a manner to be descnbed here;n.
: ~ The sides of the connector 86 are provided with outwardly e3ctending trunnions 94a and 94b. The trunnions 94a and 94b a~e positioned and dimensioned to engage slidably in the passageways 38a and 38b and to form a pivotal connechon between the ~use assembly 22 and the coupling 36.
Crossbars 96 and 98 int~rconnect the extensions 88 and 90. The ~ro~sbar 96 engages with the resilient retainer 46 when the fuse assembly 22 is pivoted in the coupling 36 to engage the fuse assembly 2~ with the terminal ~ assembly 18.
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The connector 86 is secured by a pivot pin to a bracket 10 formed on the fuse calTier 84 to define a hinge 100. The bracket 102 encircles the fuse carrier 84 and is secured thereto by a suitable fastener 104. l~e bracket 102 also includes a lif~ing ring 106 to ~aciLita~e removal and the pla ement of the fuse assembly from or on the coupling 36. The connect~r 86 terminates at its lower end to form an abutment member 110 which abuts against the open end 84a of the fuse carrier 84 when the fuse assembly is in an operative position. The hinge 100 is biased by a spring (not shown) in a direction to force the abutment member 110 away from the fuse carrier 84 when the memb~r 110 ls not restrained by a fuselink.
A male portion 78 of the latch 58 is secured to the other end 84b of the fuse carrier 84. The male portion 78 includes a housing 112 receiving the fuse carrier 84 and is secured to the carrier 84 by a suitable f stener 114. One end of the housing 112 is provided with threads to receiYe an end cap 116 which sea1s one end o~ the fuse carrie~ 84. A post 118 extends upwardly from the housing 112, the up~er surface of which defines an sngagement plate 120. The plate 120 is at a slight angle to the horizontal and is dimensioned to extend outwardly beyond the sides of ~e post 118, thereby exposing a portion of its undersu~face. The engagement plate 120 is also of a thickness greater than the separ~tion distance or aperture 76 formed between the two plates 60 and 62.
.
The male portion 78 also insludes an arm 122 pivotally connected to the post 118 by a hinge pin 124. The arm 122 tenninate3 at one end in a pull nng 126 which is position~d below the fuse carIier 84 to facilitate access. The o~ end 128 af ~e arm 122 extends upwardly along side the post 118 and is bias~ thereagainst by a spring (not shown).
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A third securing plate 130 is removeably held against the abutment member 110 by a bolt 132 to allow one end of a fuse cable 134 to be sscurgd to the connector 86. The iùse cable 134 as is well known in the art, extends into the fuse carrier 84 and is coupled to one end of a fuse S element (not shown). TSle other end of the fuse element extends through the ~use carrier 84 to the other end thereo~F. The fuse element is held in electrical contact with the male po~tiosl 78 of the la~ch 58 by the end cap 116. The connection of the fuse cable 134 to the member 110 at one end and to the end cap 116 at ~e other end counters the bias of the hinge 100 which acts to force the abutment member 110 away from the fuse car~ier.
Thus, the fuse cable 134 when intact maintains the abutment member 110 against the open end 84a of the fuse carrier.
The connec~ion and operation of the cut-out device 10 will now be described. ~irstly, the terminal assemblies 16 and 18 of the cut-out deYice 10 are secured to either ends of the insulator 20 so that they depend there3From. The power lines 12 and 14 are then secured to the Iespective ~elminal assemblies 16 and 18 by the securing plates 48 and 80. Prior to connecting the fuse car~ier and fuss cable across the terminal assemblies 16 and 18, the end cap 116 is removed from the housing 112. The fuse element and fue cable 134 are in~ted into fuse ~er 84 so that the fuse cable extends beyond ehe open one end 84a and the fuse element abuts againæt the other end 84b of the fuse carrier 84. The end cap 116 is then threadably engaged with the housing 112 to secure ~e fuse element and cable 134 in the . ~ 25 fuse car~ier. The end of ~he filse cable 134 extending fr~m the open end 84a of the carner is then pmned to the abutment member 110 by the s~curing plate 130 which acts against the bias of the hinge 100 to hold the open end 84a against ~e member 110.
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With this complete, the fuse assembly 22 is held via the lifting sing 106. The lifting ring 106 is positioned relative to the centre of gravity of the fuse assembly 22 so that the fuse assembly 22 assumes a substantially vertical orientation. With the fuse assembly in this orientation, the assembly is positioned to bring the trunnions 94a a~nd 94b into alignment with the open end of the passageways 38a and 38b provided in the outwardly facing side 36g of the coupling 36. With the trumnions aligned, the fuse assembly 22 is slid downwardly so that the tmnnions 94a and 94b move along the passageways until they rest at the bottom of the passageways in the vertical sections.
The cam surface 92 defined by the extensions 88 and 90 allows the connector 86 to engage with the coupling 36 without eontacting the retainer 46 whilst perrnitting the crossbar 96 to contact the retainer 46 when tlle fuse assembly 22 is in a substantially horizontal orientation.
Moreover, the design of the extensions 88,90 and the passageways 38a,3~b only permits the trunnions 94a,94b to slide to the bottom of the passageways when the fuse assembly 22 is in a substantially vertical orientation. This prevents the fuse assembly 22 from mal~ng an electrical connection between the two terminal assemblies 16 and 18 when the fuse assembly 22 is not seated properly in the passageways.
When the trunnions 94a and 94b are seated at the bottom of the passageways, ~e fuse assembly 22 is swung upwardly. The depth of the vertical sections 40a and 40b provide ~ing surf~ces 42a and 42b and fa~ilitate the piYoting motion of the fuse assembly 22 by maintaining the position of the trunnions in the passageways. When fuse assembly 22 is swung upwardly, the outer edge the engagement plate 120 abuts against the `~
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1 7 ~ 6 other end 74 of the resilient plate 62 forcing it to move laterally into the housing 54 against the bias. VYhen this occurs, the engagement plate 120 is capable of further upward movement, thereby allowing the top surface of the plate 120 to abut against the abutment surface 68 of the plate 60 causing its displacement upwardly against the bias.
After the plate 60 has been displaced upwardly by a distance sufflcient to form an ap~rture 76 betwoen the plates 60 and 62 larger in size than the plate 120, the outer ed~e of ~he engagement plate 120 no longer biases the resili~nt plate 62 into the housing. This allows the resilient plate 62 to spring back towards the post 118 beneath the plate 120. When the upward force impos~d on the fuse assembly 22 subsides, the plate 60 forces the engagement plate 120 towards the lower plate 62. This action results in the plate 120 being held between the plate 62 and the surface 68 thereby securing the male portion 78 to the female por~on 56 and completing an elec~ical connection between the power lines 12 and 14 via the assemblies 16, 22 and 18.
To release the connection between the resilient plates 60 and 62 and the engagement plate 120, the pull ring 126 is pulled downward thereby pivoting the ann 120 via hinge 124. The pivo~ng action forces the o~er end 128 of the arm 120 to abu~ against ~ resilient platc 62 causing it to move laterally into the housing ~4. When ~he other end 128 of the ~rm has moved the plate 62 beyond the outer edge of the engagement plate 120, the filse assembly :22 is released ~rom the housing 54. With the filse assembly released ~om the terminal assembly 18, ~e assembly 22 swings : downwardly under the influence of gravit~ vh its pivotal connection with the terminal assembly 16. In this position, the fuse assembly 22 can be , - 12- .
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disengaged from the coupling 36 by engaging the lifting ring 106 and sliding the trunnions 94a and 94b upwardly through the passageways.
When the cut-out device 10 is connected across the power S lines and an overload occurs, the arc quenching liner and the fuse element vaporize and due to the increase in pressure within the fuse carner 84 are jettisoned outwardly through the open end 84a of the ~use carrier in the case of a low fault overload and outwardly through both ends in the event of a high fault overload if the internal pressure attained in the fuse carrier is sufflcient to blow out the end cap 116~
When the fuse element vapourizes, the tension in the fuse cable 134 is released. This allows the spring to force the abutment member 110 away from the end of the fuse carrier 84 via the hinge 100. As the member 110 and fuse caener are forced apart, since the trunnions 94a,94b remain seated in the bottom of the passageways 38a,38b, the connector 86 pivots within the passageways via the tmnnions which in turn swings the hinge 100 in an arc away from the terminal assembly 18.
The movement of the hinge 100 in this manner forces ~e plate 120 to slide relative to the two plates 60 and 62 and out of the aper~ure 76.
-~ When the plate 120 slides a sufflcient distance to clear the plate 62, the fuse assembly 22 becomes disengaged from the terminal assembly 18 and is free to swing downwardly via the pivotal connection with terminal assembly 16 under the in~uence of gravity. Since the passageways 38a,38b are sufficiently deep, there is lit~e or no chance of the fuse assembly 22 accidentally disengaging from~the termin21 assembly 16 as it swings.
Accordingly, since ~e fuse assembly 22 ~rees itself from the terminal ~ .
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assembly 18 when an overload occurs, the device 10 gives a vi~ual indication of the occurrence of a fault.
Referring now to Figures 6 and 7, the present cut-out device S 10 is shown in an in-line condition ancl in a pole mount condition. In the in-line conditicn illustrated in l~igure 6, tlhe device 10 interconnects the p~wer lines 12 and 14 as the lines span be~veen suitable utili~ SUppOItS. Howe~sr, as can be seen in Figure 7, the device 10 can also be mounted to a utility pole 200. When the device 10 is to be mounted in this fashion, a bracket 202 is secured to the insulator 20 via a "U"- bolt 2W. A mounting post 206 bolted to the utility pole extends ~rom the pole 200 and is bolted to the bracket 202. A power line 20$ is connected to the terminal assembly 16 in the manner described ab~ve and extends to a consumer location or transforrner. A second power line 210 extends from the te~minal assembly 18 to the overhead power lines. Thus, as can be seen ~e present de~ice is capable of operating in various environments.
The pressnt device provides advantages in that since the cut-out device 10 is mounted in a substantially honzontal position with respect to ~he ground, vapour is jettisoned from the ~use carrier 84 in a direction that precludes the possibility of damage to equipment or injury to a passerby.
Also, since the passageways 38a and 313b are sufflciently deep and steeply angied downwardly, the trurmions 94a and 94b ale maintained in position in the passageways when the fuse assembly swings downwardly after releasing from the terminal assembly 18. Purthermore, ~he abutment surfases 44a and 44b provide additional support for the ~unnions 94a,94b to inhibit m~vement of the fuse assembly 22 along its~ axis when in an operating posi~on.
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Claims (19)
1. An electrical cut-out device for electrically connecting a pair of power lines interconnected by a substantially horizontally mounted insulator comprising:
a pair of conductive terminals each for receiving one of said power lines, each of said terminals including securing means on one end thereof, said securing means securing each of said terminals to one end of said insulator so that said terminals extend downwardly therefrom to define outwardly and inwardly facing sides, one of said terminals having a passageway formed therein having an open end in the outwardly facing side thereof, said passageway extending steeply downwards from said open end when said one terminal is extending downwardly from said insulator, said passageway being shaped at the other end thereof to define a bearing surface;
releasable latch means located on the other of said terminals; and a fusible link connectable in a substantially horizontal operative position between said one and other terminals to connect electrically said terminals, one end of said fusible link including means for slidably engaging in said passageway when said means is aligned with said other end, said fusible link being pivotal in said passageway when said means is positioned at the other end of said passageway to engage releasably the other end of said fusible link with said latch means.
a pair of conductive terminals each for receiving one of said power lines, each of said terminals including securing means on one end thereof, said securing means securing each of said terminals to one end of said insulator so that said terminals extend downwardly therefrom to define outwardly and inwardly facing sides, one of said terminals having a passageway formed therein having an open end in the outwardly facing side thereof, said passageway extending steeply downwards from said open end when said one terminal is extending downwardly from said insulator, said passageway being shaped at the other end thereof to define a bearing surface;
releasable latch means located on the other of said terminals; and a fusible link connectable in a substantially horizontal operative position between said one and other terminals to connect electrically said terminals, one end of said fusible link including means for slidably engaging in said passageway when said means is aligned with said other end, said fusible link being pivotal in said passageway when said means is positioned at the other end of said passageway to engage releasably the other end of said fusible link with said latch means.
2. An electrical cut-out device as defined in Claim 1 wherein said passageway terminates in a substantially vertical section to define an abutment surface to inhibit movement of said fusible link along its longitudinal axis when said fusible link is in said operative position.
3. An electrical cut-out device as defined in Claim 2 further comprising a resilient retainer mounted on said one terminal, and wherein said means for slidably engaging in said passageway includes a cam surface having an abutment member, said abutment member contacting said resilient retainer when said fusible link is pivoted to assume said operative position to bias said fusible link along its longitudinal axis towards said latch means.
4. An electrical cut-out device as defined in Claim 3 wherein said passageway is in the form of a pair of spaced channels, said channels being angled steeply, downwardly with respect to a horizontal axis, each of said channels including a bend along a portion of its length between said one and other ends thereof andterminating in said substantially vertical section at the other end thereof, said vertical sections lying on the longitudinal axis of said one terminal and being of sufficient depth to define said abutment and bearing surfaces.
5. An electrical cut-out device as defined in Claim 4 wherein said one terminal is in the form of a bifurcated member having a pair of spaced side walls, said channels being formed in the interior surfaces of the side walls and wherein said means for slidably engaging in said passageway includes a pair of outwardly extending trunnions, said trunnions being slidably engageable in said channels via said open ends when said fusible link is substantially vertically oriented.
6. An electrical cut-out device as defined in Claim 5 wherein said cam surface and said channels are arranged to inhibit said fusible link from being pivoted to engage the other end of said fusible link with said latch means when said trunnions are not seated in said substantially vertical sections.
7. An electrical cut-out device as defined in Claim 6 wherein said fusible link includes a lifting ring adjacent said one end thereof, said lifting ring being positioned on said fusible link so that when said fusible link is lifted via said lifting ring, said fusible link assumes said substantially vertical orientation.
8. An electrical cut-out device as defined in Claim 1 wherein said fusible link includes an engagement plate located at the other end thereof and wherein said latch means includes a pair of biased retainers, said biased retainers engaging opposite sides of said engagement plate when said fusible link is in said operative position and release means for reverse biasing said biased retainers to allow said engagement plate to be released from said biased retainers.
9. An electrical cut-out device as defined in Claim 8 wherein said release means is in the form of a pull-ring disposed beneath said fusible link adjacent the other end thereof to facilitate disengagement of said fusible link from said other terminal.
10. A generally horizontally mounted electrical cut-out device comprising: an insulator for interconnecting a pair of power lines;
a pair of conductive terminals each for receiving one of said power lines, each of said terminals extending downwardly from one end of said insulator and defining outwardly and inwardly facing sides, one of said terminals having a steep, downwardly extending passageway formed therein, said passageway including an open end formed in the outwardly facing side and being shaped at the other end thereof to define a bearing surface;
releasable latch means located on the other said terminals; and a fusible link connectable in a substantially horizontal operative position between said terminals to connect electrically said terminals and one of said fusible link including means for slidably engaging in said passageway when said means isaligned with said open end, said fusible link being pivotal in said passageway when said means is positioned at the other end of said passageway to engage releasably the other end of said fusible link with said latch means.
a pair of conductive terminals each for receiving one of said power lines, each of said terminals extending downwardly from one end of said insulator and defining outwardly and inwardly facing sides, one of said terminals having a steep, downwardly extending passageway formed therein, said passageway including an open end formed in the outwardly facing side and being shaped at the other end thereof to define a bearing surface;
releasable latch means located on the other said terminals; and a fusible link connectable in a substantially horizontal operative position between said terminals to connect electrically said terminals and one of said fusible link including means for slidably engaging in said passageway when said means isaligned with said open end, said fusible link being pivotal in said passageway when said means is positioned at the other end of said passageway to engage releasably the other end of said fusible link with said latch means.
11. An electrical cut-out device as defined in Claim 10 wherein said passageway terminates in a substantially vertical section to define an abutment surface to inhibit movement of said fusible link along its longitudinal axis when said fusible link is in said operative position.
12. An electrical cut-out device as defined in Claim 11 further comprisinga resilient retainer mounted on said one terminal and wherein said means for slidably engaging in said passageway includes a cam surface having an abutment member, said abutment member contacting said resilient retainer when said fusible link is pivoted to assume said operative position to bias said fusible link along its longitudinal axis towards said latch means.
13. An electrical cut-out device as defined in Claim 12 wherein said passageway is in the form of a pair of spaced channels, said channels being angled steeply, downwardly with respect to a horizontal axis, each of said channels including a bend along a portion of its length between said one and other ends thereof andterminating in said substantially vertical section at the other end thereof, said vertical sections lying on the longitudinal axis of said one terminal and being of sufficient depth to define said abutment and bearing surfaces.
14. An electrical cut-out device as defined in Claim 13 wherein said one terminal is in the form of a bifurcated member having a pair of spaced side walls, said channels being formed in the interior surfaces of the side walls and wherein said means for slidably engaging in said passageway includes a pair of outwardly extending trunnions, said trunnions being slidably engageable in said channels via said open ends when said fusible link is substantially vertically oriented.
15. An electrical cut-out device as defined in Claim 14 wherein said cam surface and said channels are arranged to inhibit said fusible link from being pivoted to engage the other end of said fusible link with said latch means when said trunnions are not seated in said substantially vertical sections.
16. An electrical cut-out device as defined in Claim 15 wherein said fusible link includes a lifting ring adjacent said one end thereof, said lifting ring being positioned on said fusible link so that when said fusible link is lifted via said lifting ring, said fusible link assumes said substantially vertical orientation.
17. An electrical cut-out device as defined in Claim 10 wherein said fusible link includes an engagement plate located at the other end thereof and wherein said latch means includes a pair of biased retainers, said biased retainers engaging opposite sides of said engagement plate when said fusible link is in said operative position and release means for reverse biasing said biased retainers to allow said engagement plate to be released from said biased retainers.
18. An electrical cut-out device as defined in Claim 17 wherein said release means is in the form of a pull-ring disposed beneath said fusible link adjacent the other end thereof to facilitate disengagement of said fusible link from said other terminal.
19. An electrical cut-out device as defined in Claims 10 or 18 further comprising attachment means extending from said insulator to permit said cut-outdevice to be mounted on a utility pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000601203A CA1311786C (en) | 1989-05-30 | 1989-05-30 | Electrical cut-out device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000601203A CA1311786C (en) | 1989-05-30 | 1989-05-30 | Electrical cut-out device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1311786C true CA1311786C (en) | 1992-12-22 |
Family
ID=4140129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000601203A Expired - Fee Related CA1311786C (en) | 1989-05-30 | 1989-05-30 | Electrical cut-out device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1311786C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185672A (en) * | 2015-08-19 | 2015-12-23 | 江苏省电力公司扬州供电公司 | Shield of drop-type fuse |
-
1989
- 1989-05-30 CA CA000601203A patent/CA1311786C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185672A (en) * | 2015-08-19 | 2015-12-23 | 江苏省电力公司扬州供电公司 | Shield of drop-type fuse |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |