US3579045A — High voltage air terminal chamber for indoor powe…

Claim 1

Independent Claim 220 words

In an indoor power center, the combination of: a housing, a first polyphase high-voltage circuit interrupter within said housing operable between open and closed positions and having phase output terminals and also having phase input terminals adapted to be connected to a first high-voltage electrical cable, a second polyphase high-voltage circuit interrupter within said housing operable between open and closed positions independently of said first circuit interrupter and having phase output terminals and also having phase input terminals adapted to be connected to a second high-voltage electrical cable, a plurality of fuse drawers reciprocable into and out of said housing, an elongated fuse positioned on each said fuse drawer, a movable connector member for each said fuse drawer engaging one end of said fuse on said fuse drawer when said fuse drawer is inserted into said housing and being electrically connected to corresponding phase output terminals of both said first and said second circuit interrupters, means on each said fuse drawer operable from the exterior of said housing, when said fuse drawer is inserted within said housing, for resiliently urging said connector member against said one end of said fuse on said fuse drawer, and interlock means for preventing withdrawal of said fuse drawers from said housing when either said first or said second circuit interrupter is in closed position.

Claim 2

Dependent Claim 220 words

In an indoor power center, the combination of: a housing, a first polyphase high-voltage circuit interrupter within said housing operable between open and closed positions and having phase output terminals and also having phase input terminals adapted to be connected to a first high-voltage electrical cable, a second polyphase high-voltage circuit interrupter within said housing operable between open and closed positions independently of said first circuit interrupter and having phase output terminals and also having phase input terminals adapted to be connected to a second high-voltage electrical cable, a plurality of fuse drawers reciprocable into and out of said housing, an elongated fuse positioned on each said fuse drawer, a movable connector member for each said fuse drawer engaging one end of said fuse on said fuse drawer when said fuse drawer is inserted into said housing and being electrically connected to corresponding phase output terminals of both said first and said second circuit interrupters, means on each said fuse drawer operable from the exterior of said housing, when said fuse drawer is inserted within said housing, for resiliently urging said connector member against said one end of said fuse on said fuse drawer, and interlock means for preventing withdrawal of said fuse drawers from said housing when either said first or said second circuit interrupter is in closed position.

Claim 3

Dependent Claim 35 words

In the combination defined by claim 1 wherein said interlock means includes means for preventing operation of either of said circuit interrupters to closed position when said fuse drawers can be withdrawn from said housing.

Claim 4

Dependent Claim 27 words

In the combination defined by claim 1 wherein said interlock means also includes means for preventing simultaneous operation of both of said circuit interrupters to closed position.

Claim 5

Dependent Claim 67 words

In the combination deFined by claim 1 wherein said housing has an opening therein through which the opposite end of said fuses are exposed and also including an electric transformer having a plurality of insulating bushings in said common plane and in alignment with said fuses provided with terminal means protruding through said opening in said housing into electrical engagement with said opposite end of said fuses.

Claim 6

Dependent Claim 46 words

In the combination defined by claim 1 wherein said first and second circuit interrupters have casings disposed back-to-back in horizontal planes adjacent the bottom of said housing and said common plane in which said fuse drawers are disposed is horizontal and above said circuit interrupter casings.

Claim 7

Dependent Claim 66 words

In the combination defined by claim 5 wherein said circuit interrupters are three phase and each of said circuit interrupters has three poles and three insulating bushings extending horizontally from each end thereof carrying said input and output terminals, and also including means for electrically commoning corresponding phase output terminals of said pair of circuit interrupters and electrically connecting them to one of said connector members.

Claim 8

Dependent Claim 78 words

In the combination defined by claim 4 wherein said connector members are pivoted metallic bars and including fuse-clamping means on each said fuse drawer operable from the exterior of said housing, when said fuse drawers are inserted into said housing, for resiliently urging said connector member against said one end of said fuse to thereby push said opposite end against said terminal means on said transformer insulating bushing, and means for latching said fuse drawers to said housing.

Claim 9

Dependent Claim 76 words

In the combination defined by claim 7 wherein said fuse drawer latching means includes a latching member on each fuse drawer movable between a latching position wherein said fuse drawer is held against withdrawal from said housing and a released position wherein said drawer may be withdrawn and wherein said fuse-clamping means interferes with and holds said latching member in said latching position when said fuse is clamped against said terminal means on said insulating bushing.

Claim 10

Dependent Claim 40 words

In the combination defined by claim 7 wherein said interlock means includes means to prevent operation of said fuse-clamping means in a direction to remove clamping pressure on said fuses when either of said circuit interrupters is in closed position.

Claim 11

Dependent Claim 61 words

In the combination defined by claim 4 and including means for providing universal motion of said terminal means on said transformer insulating bushings relative to said bushings and for simultaneously maintaining continuous electrical connection between said fuses and said transformer, whereby said terminal means are in current transfer relation with said fuses even when said bushings and fuses are slightly misaligned.

Claim 12

Dependent Claim 38 words

In the combination defined by claim 7 wherein said housing has a plurality of stationary insulating trays positioned in a horizontal plane above said circuit interrupters and said fuse drawers are supported on and slidable along said trays.

Claim 13

Dependent Claim 55 words

In the combination defined by claim 11 wherein said stationary trays are supported on vertical standoff insulators and said trays and fuse drawers have registering apertures therein when said fuse drawers are inserted into said housing and said pivoted connector members protrude through said registering apertures into engagement with said one end of said fuses.

Claim 14

Dependent Claim 63 words

In the combination defined by claim 6 wherein said means for electrically commoning includes a plurality of bus bars having vertical portions electrically commoning corresponding phase output terminals of said pair of circuit interrupters and horizontal portions disposed above said circuit interrupters and said connector members are pivotally mounted and electrically connected to and supported on said horizontal portions of said bus bars.

Claim 15

Dependent Claim 85 words

In the combination of claim 8 wherein each said fuse-clamping means includes rotatable threaded means on each said fuse drawer having a manual knob accessible from the exterior of said housing for engaging said pivoted connector member and actuating it in a direction longitudinally of said drawer to urge said other end of said fuse against said terminal means on said insulating bushing, and wherein said manual knob holds said latching member in said latching position when said fuse is clamped against said terminal means.

Claim 16

Dependent Claim 78 words

In the combination defined by claim 14 wherein said fuse-clamping means includes an elongated insulating rod on each fuse drawer having one end disposed adjacent said connector member when said drawer is inserted into said housing, means including a rotatable threaded member accessible from the exterior of said housing for actuating said rod longitudinally to push said connector member against said one end of said fuse, and spring means disposed between said insulating rod and said threaded member.

Claim 17

Dependent Claim 105 words

In the combination defined by claim 15 wherein each of said fuse drawers has a vertical front wall disposed against said housing when said drawer is closed and having a tapped opening therein and said rotatable member of said fuse-clamping means is a threaded shaft engaged within said opening and having a manual knob integral therewith exterior of said housing, and wherein said manual knob holds said latching member against motion when said fuse is clamped against said terminal means, whereby said fuse drawer cannot be withdrawn from said housing until said threaded shaft is rotated sufficiently to remove the clamping pressure on said fuse.

Claim 18

Dependent Claim 96 words

In the combination defined by claim 16 wherein said interlock means for preventing withdrawal of said fuse drawers from said housing when either of said circuit interrupters is in closed position includes a plurality of mechanically ganged interfering arms rotatably mounted about parallel axes on said housing and being rotatable between an interfering position wherein they block rotation of said manual knob and also obstruct withdrawal of said drawers from said housing and a noninterfering position wherein said manual knob and threaded shaft can be rotated and said fuse drawers can be withdrawn from said housing.

Claim 19

Dependent Claim 126 words

In the combination defined by claim 16 wherein each said means for latching said fuse drawer to said housing includes an eye on the front wall of said fuse drawer, a hook portion on said housing, and a latch member having an ear extending through said eye and engageable with said hook portion when said drawer is inserted into said housing, and wherein said threaded shaft is rotatable in a direction to urge said connector member against said fuse and to a position wherein said manual knob holds said latch member against motion and prevents removal of said ear from said hook portion, whereby said fuse drawer cannot be withdrawn from said housing until both said circuit interrupters are open and said fuse-clamping means is released.

Claim 20

Dependent Claim 85 words

In the combination defined by claim 1 wherein each said circuit interrupter is actuated between open and closed positions by a rotatable operating member and said interlock means includes a rotatable cam operatively connected to each said operating member, a cam follower engaging each said cam and contacting a limit position thereof when the corresponding circuit interrupter is closed, and means responsive to either cam follower engaging said limit position of the corresponding cam for interfering with removal of said fuse drawers from said housing.

Claim 21

Dependent Claim 53 words

In the combination defined by claim 19 wherein said means for interfering with removal of said fuse drawers includes a plurality of mechanically ganged interfering arms each of which is rotatable to an interfering position wherein it is in front of and blocks withdrawal of one of said fuse drawers from said housing.

Claim 22

Dependent Claim 122 words

In the combination defined by claim 19 wherein said cam followers are rods disposed generally parallel to each other and adapted to be translated longitudinally by said cams and said means for preventing simultaneous operatioN of both of said circuit interrupters to closed position includes an elongated rocker bar disposed transverse to and operatively connected adjacent its ends to said cam follower rods and a stationary stop disposed adjacent said rocker bar intermediate its ends and positioned to permit pivotal movement of said rocker bar about said stop, when one cam follower rod is moved longitudinally, but to interfere with transverse translation of said rocker bar when both said cams are rotated in a direction to actuate said cam follower rods longitudinally.

Claim 23

Dependent Claim 45 words

In the combination defined by claim 21 wherein said stop member is a defeater pin manually retractable to a noninterfering position wherein said rocker bar can be transversely translated, thereby permitting both of said circuit interrupters to be operated to the closed position when desired.

Claim 24

Dependent Claim 167 words

In the combination defined by claim 20 wherein each said cam follower has an enlarged diameter portion and said cam followers are adapted to be translated longitudinally by said cams and said means for preventing operation of either circuit interrupter to closed position when said fuse drawers can be withdrawn from said housing includes a reciprocable interlocking bar having keyhole openings therein through each of which one of said cam followers extends, the circular portion of each said keyhole opening being adapted to receive said enlarged diameter portion of said cam follower and said enlarged diameter being greater than the width of the rectangular portion of said keyhole opening, whereby said interlocking bar cannot be reciprocated when one of said cams has been rotated to actuate said enlarged diameter portion of the corresponding cam follower into said circular portion of said keyhole opening and said cam cannot be rotated to close said circuit interrupters when the cam followers are within said rectangular portion of said keyhole openings.

Claim 25

Dependent Claim 90 words

In the combination defined by claim 23 wherein said interfering arms are manually rotatable and including parallel crank linkage means operatively connecting said reciprocable interlocking bar and said mechanically ganged interfering arms for reciprocating said interlocking bar to a position wherein said cam followers are within said rectangular portions of said keyhole openings when said interfering arms are rotated to a noninterfering position wherein said fuse drawers may be withdrawn from said housing, whereby said circuit interrupters cannot be closed when said fuse drawers can be withdrawn from said housing.

Claim 26

Dependent Claim 119 words

In the combination defined by claim 24 wherein said parallel crank linkage means is responsive to rotation of said interfering arms to the interfering position wherein they block withdrawal of said fuse drawers from said housing to reciprocate said interlocking bar to the position wherein said cam followers are within said circular portion of said keyhole openings, whereby one of said circuit interrupters can be closed when said interfering arms prevent withdrawal of said drawers and said interfering arms cannot be rotated to permit fuse drawer withdrawal after one of said operating members is rotated to close the corresponding circuit interrupter and move said enlarged diameter portion of the cam follower into the circular portion of the keyhole opening.

Claim 27

Dependent Claim 150 words

In the combination defined by claim 1 wherein each of said circuit interrupters is actuated between open and closed position by a rotatable operating member and said means for preventing simultaneous operation of both circuit interrupters to closed position has associated with each said circuit interrupter a rotary cam operatively connected to said rotatable operating member, a cam follower rod associated with said cam and engaging a limit position thereon when said circuit interrupter is in closed position, spring means for resiliently urging said cam follower rod into engagement with said cam, and means including an elongated rocking bar operatively connected to said cam follower rods at its opposite ends and a Stationary stop member adjacent the middle and interfering with transverse translation of said elongated bar for preventing simultaneous rotation of both of said eccentric cams to the position wherein said limit position thereon engages said cam follower rod.

Claim 28

Dependent Claim 127 words

In the combination defined by claim 26 wherein said cam follower rods have an enlarged diameter portion and said means for preventing withdrawal of said drawers from said housing includes a plurality of mechanically ganged interference arms rotatable about parallel axes between an interfering position wherein they interfere with withdrawal of said drawers from said housing and a noninterfering position wherein said drawers can be withdrawn, and means including an elongated reciprocable interlocking bar operatively connected to said ganged interfering arms and having keyhole openings therein receiving said cam follower rods and being responsive to said interfering arms being in said interfering position for preventing rotation of either of said cams to the position wherein its associated cam follower rod engages said limit position of said cam.

Claim 29

Dependent Claim 151 words

In the combination defined by claim 27 wherein said means for preventing rotation of either of said cams includes parallel bar linkage means operatively connected to said ganged interference arms for reciprocating said interlocking bar between a first position wherein said cam follower rods are in the circular portion of said keyhole openings when said interfering arms are in said interfering position and a second position wherein said cam follower rods are in the rectangular portion of said keyhole openings when said interfering arms are in said noninterfering position, whereby one of said operating members can be rotated to close the corresponding circuit interrupter and actuate said enlarged diameter portion of said cam follower rod into said circular portion of said keyhole opening when said interfering arms are in said interfering position, thereby preventing movement of said interfering arms to the noninterfering position when one of said circuit interrupters is closed.

Claim 30

Dependent Claim 74 words

In the combination defined by claim 4 wherein said electrical transformer has a casing adjacent said housing and including three mating male and female means positioned at the vertices of a triangle for aligning said transformer casing with said housing, each said aligning means comprising a stud member and a ring member slidably receiving said stud member, one of said members being affixed to said housing and the other being affixed to said casing.

Claim 31

Dependent Claim 90 words

In the combination defined by claim 4 wherein said electrical transformer has a casing adjacent said housing and including a plurality of means for securing said casing to said housing, each of said securing means including a threaded stud member, a plate member having a circular aperture therein, a cylindrical alignment compensating member disposed and adapted to rotate within said circular aperture and having an oblong axial opening receiving said threaded stud member, one of said members being affixed to said casing and the other being affixed to said housing.

Claim 32

Dependent Claim 87 words

In the combination defined by claim 2 wherein said interlock means also includes means for preventing simultaneous operation of both of said circuit interrupters to closed position and said housing has an opening therein through which the opposite ends of said fuses are exposed and also including an electrical transformer having a plurality of insulating bushings in said common plane and in alignment with said fuses provided with terminal means protruding through said opening in said housing into electrical engagement with said opposite end of said fuses.

Claim 33

Dependent Claim 103 words

In the combination defined by claim 31 wherein said circuit interrupters have casings disposed back-to-back in horizontal planes adjacent the bottom of said housing and said common plane, in which said fuse drawers is disposed, is horizontal and above said circuit interrupter casings and said circuit interRupters and said transformer are three phase and each said circuit interrupter has three poles and three insulating bushings extending horizontally from each end thereof carrying input and output terminals, and also including means for electrically commoning corresponding phase output terminals of said pair of circuit interrupters and electrically connecting them to one of said connector members.

Claim 34

Dependent Claim 77 words

In the combination defined by claim 31 wherein said connector members are pivoted metallic bars and including fuse-clamping means on each said fuse drawer operable from the exterior of said housing, when said fuse drawers are inserted into said housing, for resiliently urging said connector member against said one end of said fuse to thereby push said opposite end against said terminal means on said transformer-insulating bushings, and means for latching said fuse drawers to said housing.

Claim 35

Dependent Claim 110 words

In the combination defined by claim 7 wherein said fuse drawer latching means includes a latching member on each fuse drawer movable between a latching position wherein said fuse drawer is held against withdrawal from said housing and a released position wherein said drawer may be withdrawn and wherein said fuse-clamping means interferes with and holds said latching member in said latching position when said fuse is clamped against said terminal means on said insulating bushing and wherein said interlock means includes means to prevent operation of said fuse-clamping means in a direction to remove clamping pressure on said fuses when either of said circuit interrupters is in closed position.

Claim 36

Dependent Claim 110 words

In the combination defined by claim 33 wherein said fuse drawer latching means includes a latching member on each fuse drawer movable between a latching position wherein said fuse drawer is held against withdrawal from said housing and a released position wherein said drawer may be withdrawn and wherein said fuse-clamping means interferes with and holds said latching member in said latching position when said fuse is clamped against said terminal means on said insulating bushing and wherein said interlock means includes means to prevent operation of said fuse-clamping means in a direction to remove clamping pressure on said fuses when either of said circuit interrupters is in closed position.

Claim 37

Dependent Claim 60 words

In the combination defined by claim 34 and including means for providing universal motion of said terminal means on said transformer-insulating bushings relative to said bushings and for simultaneously maintaining continuous electrical connection between said fuses and said transformer, whereby said terminal means are in current transfer relation with said fuses even when said bushings and fuses are slightly misaligned.

Claim 38

Dependent Claim 82 words

In the combination defined by claim 8 wherein said housing has a plurality of stationary insulating trays positioned in a horizontal plane above said circuit interrupters and supported on vertical standoff insulators and said fuse drawers are supported on and slidable along said trays and said trays and fuse drawers have registering apertures therein, when said fuse drawers are inserted into said housing, and said pivoted connector members protrude through said registering apertures into engagement with said one end of said fuses.

Claim 39

Dependent Claim 92 words

In the combination defined by claim 12 and also including means for electrically commoning corresponding phase output terminals of said pair of circuit interrupters and electrically connecting them to one of said connector members and wherein said means for electrically commoning includes a plurality of bus bars having vertical portions electrically commoning corresponding phase output terminals of said first and second circuit interrupters and horizontal portions disposed above said circuit interrupters and said connector members are pivotally mounted and electrically connected to and supported on said horizontal portions of said bus bars.

Claim 40

Dependent Claim 157 words

In the combination defined by claim 38 wherein each said fuse-clamping means includes rotatable threAded means on each said fuse drawer having a manual knob accessible from the exterior of said housing for engaging said pivoted connector member and actuating it in a direction longitudinally of said drawer to urge said other end of said fuse against said terminal means on said insulating bushing, and wherein said manual knob holds said latching member in said latching position when said fuse is clamped against said terminal means and said fuse-clamping means includes an elongated insulating rod on each fuse drawer having one end disposed adjacent said connector member when said drawer is inserted into said housing, means including a rotatable threaded member accessible from the exterior of said housing for actuating said rod longitudinally to push said connector member against said one end of said fuse, and spring means disposed between said insulating rod and said threaded member.

Claim 41

Dependent Claim 126 words

In the combination defined by claim 17 wherein each said fuse means for latching said fuse drawer to said housing includes an eye on the front wall of said fuse drawer, a hook portion on said housing, and a latch member having an ear extending through said eye and engageable with said hook portion when said drawer is inserted into said housing, and wherein said threaded shaft is rotatable in a direction to urge said connector member against said fuse and to a position wherein said manual knob holds said latch member against motion and prevents removal of said ear from said hook portion, whereby said fuse drawer cannot be withdrawn from housing until both said circuit interrupters are open and said fuse-clamping means is released.

Claim 42

Dependent Claim 115 words

In the combination defined by claim 31 wherein each said circuit interrupter is actuated between open and closed positions by a rotatable operating member and said interlock means includes a rotatable cam operatively connected to each said operating member, a cam follower engaging each said cam and contacting a limit position thereof when the corresponding circuit interrupter is closed, and means responsive to either cam follower engaging said limit position of the corresponding cam for interfering with removal of said fuse drawers from said housing including a plurality of mechanically ganged interfering arms each of which is rotatable to an interfering position wherein it blocks removal of one of said fuse drawers from said housing.

Claim 43

Dependent Claim 110 words

In the combination defined by claim 41 wherein said connector members are pivoted metallic bars and including fuse-clamping means on each said fuse drawer operable from the exterior of said housing, when said fuse drawers are inserted into said housing, for resiliently urging said connector member against said one end of said fuse to thereby push said opposite end against said terminal means on said transformer-insulating bushing, means for latching said fuse drawers to said housing, and wherein said interlock means includes means to prevent operation of said fuse-clamping means in a direction to remove clamping pressure on said fuses when either of said circuit interrupters is in closed position.

Claim 44

Dependent Claim 158 words

In the combination defined by claim 42 wherein said means for interfering with removal of said fuse drawers includes a plurality of mechanically ganged interfering arms each of which is rotatable to an interfering position wherein it blocks withdrawal of one of said fuse drawers from said housing and said cam followers are generally parallel rods adapted to be translated longitudinally by said cams and said means for preventing simultaneous operation of both of said circuit interrupters to closed position includes an elongated rocker bar disposed transverse to and operatively connected adjacent its ends to said cam follower rods and a stationary stop disposed adjacent said rocker bar intermediate its ends and positioned to permit pivotal movement of said rocker bar about said stop, when one cam follower rod is moved longitudinally, but to interfere with transverse translation of said rocker bar when both said cams are rOtated in a direction to actuate said cam follower rods longitudinally.

Claim 45

Dependent Claim 116 words

In the combination defined by claim 25 wherein said cam followers are generally parallel rods adapted to be translated longitudinally by said cams and said means for preventing simultaneous operation of both of said circuit interrupters to closed position includes an elongated rocker bar disposed transverse to and operatively connected adjacent its ends to said cam follower rods and a stationary stop disposed adjacent said rocker bar intermediate its ends and positioned to permit pivotal movement of said rocker bar about said stop, when one cam follower rod is moved longitudinally, but to interfere with transverse translation of said rocker bar when both cams are rotated in a direction to actuate said cam follower rods longitudinally.

Claim 46

Dependent Claim 135 words

In the combination defined by claim 33 wherein each of said circuit interrupters is actuated between open and closed positions by a rotatable operating member and said means for preventing simultaneous operation of both circuit interrupters to closed position has associated with each said circuit interrupter a rotary cam operatively connected to said rotatable operating member, a cam follower rod associated with said cam and engaging a limit position thereon when said circuit interrupter is in closed position, and means including an elongated rocking bar operatively connected to said cam follower rods at its opposite ends and a stationary stop member adjacent the middle and interfering with transverse translation of said elongated bar for preventing simultaneous rotation of both said eccentric cams to the position wherein said limit position thereon engages said cam follower rod.

Claim 47

Dependent Claim 68 words

In the combination defined by claim 11 and including latching means on each said fuse drawer movable between a latching position wherein said fuse drawer is held against withdrawal from said housing and a released position wherein said drawer may be withdrawn and wherein said means for urging said connector member against one end of said fuse interferes with and holds said latching means in said latching position.

Claim 48

Dependent Claim 43 words

In the combination defined by claim 46 wherein said interlock means includes means to prevent release of said means for urging said connector member against one end of said fuse when either said first or said second circuit interrupter is in closed position.

Claim 49

Dependent Claim 71 words

In the combination defined by claim 47 wherein said housing has a plurality of stationary trays positioned in a horizontal plane and said fuse drawers are supported on and slidable on said trays, and wherein said trays and fuse drawers have registering apertures therein, when said fuse drawers are inserted into said housing, and said connector members protrude through said registering apertures into engagement with said one end of said fuses.

Claim 50

Dependent Claim 154 words

In combination, a housing, a high-voltage circuit interrupter within said housing operable between open and closed positions and having an output terminal and also having an input terminal adapted to be connected to a high-voltage electrical cable, a fuse drawer reciprocable into and out of said housing, an elongated fuse on each said fuse drawer, a movable connector member engaging one end of said fuse on said fuse drawer, when said fuse drawer is inserted into said housing, and being electrically connected to said output terminal, means for latching said fuse drawer to said housing, and fuse-clamping means on said fuse drawer operable from the exterior of said housing, when said fuse drawer is inserted into said housing, for urging said connector member against one end of said fuse, said fuse-clamping means interfering with and preventing release of said drawer-latching means when said connector member is urged against said one end of said fuse.

Claim 51

Dependent Claim 154 words

In combination, a housing, a high-voltage circuit interrupter within said housing operable between open and closed positions and having an output terminal and also having an input terminal adapted to be connected to a high-voltage electrical cable, a fuse drawer reciprocable into and out of said housing, an elongated fuse on each said fuse drawer, a movable connector member engaging one end of said fuse on said fuse drawer, when said fuse drawer is inserted into said housing, and being electrically connected to said output terminal, means for latching said fuse drawer to said housing, and fuse-clamping means on said fuse drawer operable from the exterior of said housing, when said fuse drawer is inserted into said housing, for urging said connector member against one end of said fuse, said fuse-clamping means interfering with and preventing release of said drawer-latching means when said connector member is urged against said one end of said fuse.

Claim 52

Dependent Claim 42 words

In the combination defined by claim 49 and including interlock means for preventing operation of said fuse-clamping means in a direction to permit said connector member to disengage said one end of said fuse when said circuit interrupter is in closed position.

Claim 53

Dependent Claim 66 words

In the combination defined by claim 50 wherein said housing has a stationary tray and said fuse drawer is supported on and slidable on said tray and wherein said tray and fuse drawer have registering apertures, when said fuse drawer is inserted into said housing, and said connector member is pivoted and protrudes through said registering apertures into engagement with said one end of said fuse.

Claim 54

Dependent Claim 128 words

In the combination defined by claim 50 wherein said connector member is pivoted and said means for latching said fuse drawer includes a latching member on said fuse drawer movable between a latching position wherein said fuse drawer is held against withdrawal from said housing and a released position wherein said drawer may be withdrawn and said fuse-clamping means includes rotatable threaded means on said fuse drawer having a manual knob accessible from the exterior of said housing for engaging said pivoted connector member and actuating it in a direction longitudinally of said drawer and against said one end of said fuse, and wherein said manual knob holds said latching member in said latching position when said connector member is urged against said one end of said fuse.

Claim 55

Dependent Claim 27 words

In the combination defined by claim 52 and including interlock means for preventing withdrawal of said fuse drawer from said housing when said circuit interrupter is closed.

Claim 56

Dependent Claim 86 words

In the combination defined by claim 53 wherein said interlock means includes an interfering arm mounted on said housing for rotation between an interfering position wherein it blocks rotation of said manual knob and withdrawal of said fuse drawer from said housing when said circuit interrupter is closed and a noninterfering position wherein said manual knob and said threaded means can be rotated until said pivoted connector member disengages said one end of said fuse and said latching member can be moved to said released position.

Claim 57

Dependent Claim 93 words

In the combination defined by claim 54 wherein said fuse drawer has an aperture therein and said fuse-clamping means includes an elongated insulating rod on said fuse drawer movable longitudinally thereof, an insulating shoe disposed adjacent one end of said insulating rod and depending through said aperture in said drawer and being adapted to engage said connector member and pivot it upwards against said one end of said fuse when said drawer is inserted into said housing, and spring means disposed between and operatively connecting said rotatable threaded means and said insulating rod.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1974-05-17	1974-11-16	1975-05-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1978-05-17	1978-11-16	1979-05-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1982-05-17	1982-11-16	1983-05-18	$7700.00	Window Closed / Lapsed

High voltage air terminal chamber for indoor power center with interlocks between fuse drawers and circuit breakers, fuse clamping and latching means, and universally pivotal terminal means

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