US2748212A - Single-pillar scissor-type disconnect switch for high tension installations - Google Patents

Description

May 29, 1956 2,748,212

L. BUTZ SINGLE-PILLAR SCISSOR-TYPE DISCONNECT SWITCH FOR HIGH TENSION INSTALLATIONS Filed May 31, 1955 5 INVENTOR rZ oZ'Z-a/L $445, 6% viii,

ATTORNEY United States Patent SINGLE-PILLAR SCISSOR-TYPE DISCONNECT SWITCH FOR HIGH TENSION INSTALLA- TIONS Lothar Butz, Nussbaumen, near Baden, Switzerland, as-

signor to Aktiengesellschaft Brown, Boveri & Cie, Baden, Switzerland Application May 31, 1955, Serial No. 512,079

Claims priority, application Switzerland June 10, 1954 2 Claims. (Cl. 200-48) This invention relates to a so-called single-pillar scissor-type disconnector for high tension installations and is characterized in that there are two parallel pairs of scissors, each pair of scissors having two spaced-apart arms swingable in the same direction about parallel axles mounted in the insulator head, one of said arms being divided into two parts by a knee joint, the free ends of said arms being connected by hinge joints to rods which cross and are pivoted to each other, the ends of said intersecting rods beyond the pivot point providing a yoke contact. An expansion spring is positioned between said hinge joints.

The invention is illustrated in the accompanying drawings in which Fig. 1 is a front elevation of the disconnector, positioned vertically,

Fig. 2 is a diagrammatic front elevational view showing the disconnector of Fig. 1 in its connected position in full lines and in its collapsed and disconnected position in broken lines,

Fig. 3 is a diagrammatic front elevation of the disconnector, positioned horizontally with the connected arrangement shown in full lines and the collapsed and disconnected arrangement shown in broken lines, and

Fig. 1a is an end view showing the pair of the connectors mounted on a single insulator head.

Referring to the drawings the insulator head 1 carries two axles 2 and 3, the axle 3 being positioned above the axle 2 a distance which is at least equal to the width of the scissor arms 4 and 5. The arms 4 and 5 are mounted on the axles 2 and 3 to swing in the same direction (counterclockwise) through an angle of about to bring them to substantially parallel positions as shown in Fig. 2. Arm 4 is shorter than arm 5 and is connected to the link 9 by the knee joint 10 comprising the stop 11 which prevents the link 9 from swinging in one direction with respect to arm 4 beyond the alined position shown in Fig. 1 but permits it to swing in the opposite direction to the position shown in Fig. 2. The rods 6 and 7 are hinged to the ends of the link 9 and the arm 5 respectively at the joints 12 and 13 respectively. Rods 6 and 7 cross and are pivoted to each other at the joint 8 and their free ends 6a and 7a form the yoke which serves to grasp the contact piece 14 of the line 15. The spring 16 is compressed between the joints 12 and 13 and tends to push them apart. The arms 4 and 5 are, as stated above, connected to axles 2 and 3 in the insulator head 1, said axles being interlocked (not shown) within the insulator head so that they rotate together in the same direction. Inside of the insulator head 1, a motor (not shown) is connected to rotate the axles 2 and 3. When axles 2 and 3 are rotated counterclockwise as viewed in Fig. 1 arms 4 and 5 are swung to the horizontal position shown in Fig. 2 thereby lowering the rods 6 and 7 away from the contact piece 14 to the collapsed position shown in Fig. 2 and breaking the connection.

I claim:

1. A single-pillar scissor-type disconnector for high tension installations comprising an insulator head, two spaced apart rotatable axles mounted in said head, means interlocking said axles for simultaneous rotation in the same direction, means for rotating said axles, a pair of arms of substantially equal length mounted on said axles and rotatable therewith, one of said arms being rigid and the other being divided into two portions by a knee joint permitting the portion remote from the axle to swing toward the other arm, rods hinged to the free ends of said arms, said rods crossing each other and being pivoted to each other at the point of intersection, and a spring positioned between said hinges.

2. A single-pillar scissor-type disconnector as defined in claim 1 in which two pairs of arms and associated rods and spring are mounted on said axles parallel to each other.

No references cited.

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