Metal enclosed loop switches with drawout fuses, fuse isolator switches and ground switches

Claim 2

Loop circuit switching apparatus comprising: a loop electric power supply circuit conductor adapted to be energized from either or both ends, first and second loop feeder switches connected in series to said loop circuit conductor, series conductor means connecting said loop feeder switches in series whereby on closure thereof the loop circuit extends therethrough, a fuse isolator switch connected to said series conductor means, a load circuit, and a fuse connected in series with said fuse isolator switch and to said load circuit whereby said load circuit is connected to said loop circuit conductor when either or both of said loop feeder switches is closed.

Claim 3

Loop circuit switching apparatus according to claim 1 wherein: housing means enclose said loop feeder switches and said fuse isolator switch, and a drawer slidably mounted on said housing means has said fuse mounted therein for disconnection from said fuse isolator switch on withdrawal of said drawer.

Claim 4

Loop circuit switching apparatus according to claim 1 wherein: each loop feeder switch and said fuse isolator switch includes a stationary contact, and conducting means commonly mount said stationary contacts.

Claim 5

Loop circuit switching apparatus according to claim 1 wherein: a second fuse isolator switch is connected to said series conductor means between said loop feeder switches, and a second fuse is connected in series with said second fuse isolator switch.

Claim 6

Loop circuit switching apparatus according to claim 3 wherein an arc extinguishing structure for each stationary contact is mounted on said conducting means for cooperation with the respective switch blade.

Claim 7

Loop circuit switching apparatus according to claim 3 wherein a grounding switch individual to each feeder switch is arranged when closed to connect the respective feeder switch blade to ground.

Claim 8

Loop circuit switching apparatus comprising: a support frame, a stationary insulator on said support frame, a contact support plate on said stationary insulator, first and second loop feeder switch contacts connected to said contact support plate, fiRst and second loop feeder switch blades pivoted on said support frame for engaging and disengaging said first and second loop feeder switch contacts respectively, a fuse isolator switch contact connected to said contact support plate, a fuse isolator switch blade pivoted on said support frame for engaging and disengaging said fuse isolator switch contact, and a fuse on said support frame connected to said fuse isolator switch blade.

Claim 9

Loop circuit switching apparatus comprising: a support frame, a stationary insulator on said support frame, a contact support plate on said stationary insulator, first and second loop feeder switch contacts connected to said contact support plate, fiRst and second loop feeder switch blades pivoted on said support frame for engaging and disengaging said first and second loop feeder switch contacts respectively, a fuse isolator switch contact connected to said contact support plate, a fuse isolator switch blade pivoted on said support frame for engaging and disengaging said fuse isolator switch contact, and a fuse on said support frame connected to said fuse isolator switch blade.

Claim 10

Loop circuit switching apparatus according to claim 7 wherein a drawer mounted on said support frame has said fuse mounted therein for disconnection from said fuse isolator switch blade on withdrawal of said drawer.

Claim 11

Loop circuit switching apparatus according to claim 7 wherein a grounding switch blade individual to each loop feeder switch blade is pivoted on said support frame and is arranged to connect the respective loop feeder switch blade to ground.

Claim 12

Loop circuit switching apparatus according to claim 7 wherein: operating means individual to each switch blade is arranged to pivot it between open and closed positions, and manually operable means is provided on said support frame for each of said operating means.

Claim 13

Loop circuit switching apparatus according to claim 10 wherein said manually operable means all are located at one end of said support frame.

Claim 14

Loop circuit switching apparatus according to claim 10 wherein: said manually operable means for said first and second loop feeder switch blades are located at one end of said support frame, and said manually operable means for said fuse isolator switch blade is located remotely from said one end of said support frame.

Claim 15

Loop circuit switching apparatus according to claim 9 wherein: operating means individual to each switch blade is arranged to pivot it between open and closed positions, and manually operable means is provided on said support frame for each of said operating means.

Claim 16

Loop circuit switching apparatus according to claim 13 wherein said manually operable means all are located at one end of said support frame.

Claim 17

Loop circuit switching apparatus according to claim 13 wherein: said manually operable means for said first and second loop feeder switch blades and for said grounding switch blade are located at one end of said support frame, and said manually operable means for said fuse isolator switch blade is located remotely from said one end of support frame.

Claim 18

Loop circuit switching apparatus according to claim 7 wherein an arc-extinguishing structure for each switch contact is mounted on said contact support plate for cooperation with the respective switch blade.

Claim 19

Loop circuit switching apparatus comprising: a support frame, a stationary stack of insulators on said support frame, a contact support plate between adjacent insulators of said stack, first and second loop feeder switch contacts secured to each contact support plate on opposite sides of said stack of insulators, first and second stacks of insulators pivoted on said support frame, first and second loop feeder switch blades fixed between adjacent insulators of said pivoted stacks of insulators respectively for engaging and disengaging the respective loop feeder switch contacts, a fuse isolator switch contact on each contact support plate, a third stack of insulators pivoted on said support frame, a fuse isolator switch blade fixed between adjacent insulators of said third stack of insulators for engaging and disengaging the respective fuse isolator switch contacts, and a fuse on said support frame connected to each fuse isolator switch blade.

Claim 20

Loop circuit switching apparatus comprising: a support frame, a stationary stack of insulators on said support frame, a contact support plate between adjacent insulators of said stack, first and second loop feeder switch contacts secured to each contact support plate on opposite sides of said stack of insulators, first and second stacks of insulators pivoted on said support frame, first and second loop feeder switch blades fixed between adjacent insulators of said pivoted stacks of insulators respectively for engaging and disengaging the respective loop feeder switch contacts, a fuse isolator switch contact on each contact support plate, a third stack of insulators pivoted on said support frame, a fuse isolator switch blade fixed between adjacent insulators of said third stack of insulators for engaging and disengaging the respective fuse isolator switch contacts, and a fuse on said support frame connected to each fuse isolator switch blade.

Claim 21

Loop circuit switching apparatus according to claim 17 wherein said stationary stack of insulators is located at the apex of an isosceles triangle and said first and second pivoted stacks of insulators are located at the ends of the base of said triangle.

Claim 22

Loop circuit switching apparatus according to claiM 17 wherein a drawer mounted on said support frame has said fuses mounted therein for disconnection from said isolator switch blades on withdrawal of said drawer.

Claim 23

Loop circuit switching apparatus according to claim 17 wherein: first and second ground switch shafts are pivoted on said support frame, and first and second ground switch blades are fixed to said pivoted shafts respectively for grounding the respective first and second loop feeder switch blades.

Claim 24

Loop circuit switching apparatus according to claim 17 wherein: operating means individual to each of said stacks of insulators for pivoting them between open and closed positions, and manually operable means on said support frame for each operating means.

Claim 25

Loop circuit switching apparatus according to claim 21 wherein said manually operable means all are located at one end of said support frame.

Claim 26

Loop circuit switching apparatus according to claim 21 wherein: said manually operable means for said first and second stacks of insulators are located at one end of said support frame, and said manually operable means for said third stack of insulators is located remotely from said one end of said support frame.

Claim 27

Loop circuit switching apparatus according to claim 21 wherein: operating means individual to each of said stacks of insulators and to each of said ground switch shafts for pivoting them between their respective operating positions, and manually operable means on said support frame for each of said operating means.

Claim 28

Loop circuit switching apparatus according to claim 24 wherein said manually operable means all are located at one end of said support frame.

Claim 29

Loop circuit switching apparatus according to claim 24 wherein: said manually operable means for said first and second stacks of insulators and for said ground switch shafts are located at one end of said support frame, and said manually operable means for said third stack of insulators is located remotely from said one end of said support frame.

Claim 30

Loop circuit switching apparatus according to claim 17 wherein an arc-extinguishing structure for each switch contact is mounted on the respective contact support plate for cooperation with the respective switch blade.

Claim 31

Loop circuit switching apparatus according to claim 20 wherein: said stationary stack of insulators is located at 116 apex of an isosceles triangle, said first and second pivoted stacks of insulators are located at the ends of the base of said triangle, and said ground switch shafts are located between said first and second pivoted stacks of insulators and on the side of said base of said triangle away from said apex.