US2889435A - Telescoping blade switch - Google Patents

Telescoping blade switch Download PDF

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Publication number
US2889435A
US2889435A US660920A US66092057A US2889435A US 2889435 A US2889435 A US 2889435A US 660920 A US660920 A US 660920A US 66092057 A US66092057 A US 66092057A US 2889435 A US2889435 A US 2889435A
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Prior art keywords
blade
switch
pinion
rack
contact
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US660920A
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Roy H Albright
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ITE Circuit Breaker Co
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ITE Circuit Breaker Co
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H31/00Air-break switches for high tension without arc-extinguishing or arc-preventing means
    • H01H31/26Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
    • H01H31/32Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with rectilinearly-movable contact

Description

June 2" 1959 I R. H. ALBRIGHT 2,889,435 TELESCOPING BLADE SWITCH I Filed May 22, 1957 4 Sheets-Sheet 1 W VQ/M; BY
June 2, 1959 R. H. ALBRlGHT TELESCOPING BLADE SWITCH 4 Sheets-Sheet 2 Filed May 22, 1957 INVENTOR. ia fl flzie/w/r BY 7% June 2, 1959 R. H. ALBRIGHT TELESCOPING BLADE SWITCH 4 Sheets-Sheet 5 Filed May 22', 1957 June 2, i959 R. H. ALBRIGHT TELESCOPING BLADE SWITCH Filed May 22, 1957 v 4 Sheets-Sheet 4 NVENTOR. fldyji 191 6/9/6797 q kw igg States TELESCDPING BLADE SWITCH Roy H. Albright, Grcensburg, Pa., assignor to I-T-E Circuit Breaker Company, Phiiadelphia, Pa., a corporation of Pennsylvania Application May 22, 1957, Serial No. 660,920
Claims. (Cl. 200-163) This invention relates to electric switches used in high current and high voltage applications and more particularly to an electric switch wherein the operating force therefore is transmitted through a rotating insulator to move the switch blade along its longitudinal axis, which coincides with the longitudinal axis of the terminating conductor, to effect circuit opening and closing.
In isolated phase bus, metal enclosed switchgear, and certain indoor applications space is at a premium. At the present time the conventional methods of breaking the circuit, in such equipment, comprise a pivoted blade or a blade that is moved transverse to its own axis to produce a double break. Therefore, equipment must be constructed with large unoccupied spaces through which the blades will travel during operation of the switches.
This invention provides a blade which is moved along its longitudinal axis to telescope within one of the terminating conductors thereby achieving a large saving in space. The telescoping blade switch lends itself to high current applications as it permits the use of more highly efiicient tubular conducting members for blades than the conventional switches using bar type blades. The telescoping blades permit the use of multiple contacts on the outer surface of the blades to provide a uniform and effective current distribution. Inasmuch as the blade may have essentially the same contour as the conductors, the blade will have an equalized current distribution. Furthermore, this switch is adaptable for high voltage applications since the parts can be effectively shielded to approach a uniform electrostatic field which is essential for high dielectric characteristics.
Movement is imparted to the blade by means of an operating mechanism comprising a pinion gear which is in operative engagement with a rack secured to the blade. A rotatable insulator is interposed between the pinion gear and the switch actuating means which may be hand or power operated.
The rack and pinion require very little space. In fact, in the case of isolated phase bus, with its large hollow conductors, the rack and pinion will mount inside the conductors and the entire switch will mount inside an enclosure of the same dimensions as the bus housing. For smaller sized conductors the pinion will be mounted outside of the blade and cooperate with a rack mounted on the inner surface of the blade.
Operational force requirements are very low which reduces the stresses on the rotatable insulator. Furthermore, the insulator is not subjected to a cantilever load but rather to a torsional load which it is better able to withstand.
Accordingly, a primary object of this invention is to provide an electric switch for high current and high voltage application which does not require additional space for blade movement during operation of the switch.
Another object is to provide an electric switch having a telescoping blade operated by means of a rack and pinion.
Still another object is to provide an electric switch having a telescoping blade operated by means of a rack and pinion wherein the pinion is driven through a rotatable insulator.
A further object is to provide an electric switch having a telescoping blade operated by means of a rack and pinion both mounted within the blade.
Still another object is to provide an electric switch having a telescoping blade operated by means of a rack and pinion wherein the rack is mounted on the blade and the pinion is mounted outside the blade.
Yet another object is to provide an isolated phase bus having a telescoping blade switch wherein the blade is operated by means of a rack and pinion both mounted inside the blade and the pinion is driven by a rotatable insulator positioned between the bus housing and hollow bus bar.
These objects and other objects will readily become apparent after reading the following description of the accompanying drawings in which:
Figure 1 is a side elevation of a switchgear enclosure wherein the telescoping blade switch may be mounted.
Figure 2 is a section through line 2-2 of Figure 1 looking in the direction of arrows 2-2.
Figure 3 is a longitudinal section of a telescoping blade switch having the actuating pinion mounted externally of the blade. In Figure 3 the switch is open.
Figure 4 is a view similar to that of Figure 3 with the switch closed.
Figure 5 is a section, reduced in size, through line 55 of Figure 3 looking in the direction of arrows 55.
Figure 6 is a section, reduced in size, through line 66 of Figure 3 looking in the direction of arrows 66.
Figure 7 is a longitudinal section of another embodiment of the telescoping blade switch.
Figure 8 is a section through line -8 8 of Figure 7 looking in the direction of arrows 8-8.
Figure 9 is a section through line 9-9 of Figure 7 looking in the direction of arrows 9-9.
Figure 9a is a transverse section of isolated phase bus having a telescoping blade switch.
Figure 10 is a section through line iii-10 of Figure 7 looking in the direction of arrows 1(l10.
Referring more particularly to Figures 1-6, switchgear enclosure 10 is provided as a setting for the first embodiment of this invention. Balcony 97, reached by stairway 96, encircles enclosure 10' about midway between the top and bottom thereof. Upper 99 and lower 98 access doors provide convenient entrance to the interior of enclosure 10' for maintenance purpose. Hand operated mechanism 11, mounted near ground level to the outside of enclosure it acts through rotating linkages 12, through 19 and directional gear boxes 20 and 21 to simultaneously operate three identical switches 22.
For the sake of simplicity, only one switch 22 and its coupling to its associated directional gear box 20 shall be described, it being understood that the other ganged switches 22 are substantially identical. Switch 22 comprises a jaw structure 24 mounted on a first conductor 25, a contact structure 26 mounted on a second conductor 27, and a movable blade 28 which is slidably positioned within contact structure 26. Conductors 25 and 27 are positioned in axial alignment with a gap therebetween which is bridged by blade 28 when the switch 22 is in a closed position (Figure 4).
Contact structure 26 comprises a housing 32 which has mounted therein contact fingers 33 which are'arr-anged in circular fashion to be in wiping contact with the outer surface of blade 28. Garter springv 34 provides'a' biasing force to urge fingers 33 against blade'28. Housing'32i is secured to hollow conductor 27 by means of bolts 31, which also pass through flanges 30 of clamp 29 which is secured to the end of conductor 27. Pinion 35 is positioned in housing 32 and is mounted for rotation on shaft 36 with teeth 35 being in operative engagement with longitudinal gear rack 37 on the outer surface of blade 28.
law structure 24 is secured to hollow conductor 25 at the end thereof by means of bolts 38 which pass through flange 39 of clamp 40 which is secured to the end of conductor 25. It is to be noted that blade 28, jaw structure 24, and conductors 25, 27 are axially aligned.
When pinion 35 is rotated clockwise with respect to Figure 3, plate 28 Will be projected from housing 32 into engagement with jaw structure 24 as in Figure 4. law structure 24 includes a tapered guide means 41 at the entrance thereof to guide blade 28 between the circular arranged contact fingers 42 which are biased toward the longitudinal axis by garter spring 43 into engagement with the outer surface of blade 28. Thus, an electrical path is completed between hollow conductor 25 through the contact fingers 42 of jaw structure 24, blade 28, contact fingers 33 of contact structure 26 to the hollow conductor 27. If switch 22 is mounted with the longitudinal axis of conductors 25, 27 in a vertical position with conductor 27 positioned below conductor 25, a spring 44 is provided to counterbalance the weight of blade 28. One end of spring 44 rests against abutment 45 which is welded or otherwise secured to conductor 27 and the other end of spring 45 rests against member 46 which is wedged into blade 28 thereby biasing blade 28 upward and in this manner lessens the force required to operate switch 22 to its closed position and the force required to maintain blade 28 in its projected position.
A rotating insulator 50 serves as the operative connection between rotating linkage 20 and pinion shaft 36. Inserts 51 and 52 project from ends 53, 54 respectively of insulator 50 and are secured thereto by means of die metal recess linings 55. Pin 57 secures insert 52 to coupling 56 which is secured to shaft 36 by means of said screws 58 while pin 59 secures insert 51 to coupling 60 which is joined to output shaft 61 of gear box 20 by means of key 62 and screw 63.
Shaft 64 of gear box 20 is driven by one of the rotating linkages 14-49 having splined ends (not shown) which mate with internal formations 64' to thereby drive bevel gear 65. Bevel gear 65 mates with a second bevel gear 66 keyed to output shaft 61 to thereby rotating insulator 50 which in turn rotates pinion shaft 36 to drive pinion 35 and operate switch 22.
When switch 22 is closed, blade 28 bridges the gap between jaw structure 24 and contact structure 26. To move switch 22 to its open position of Figure 3, pinion 35 is rotated counter clockwise with respect to Figure 3. Pinion 35 being in engagement with rack 37 will move blade 28 longitudinally to the right with respect to Figure 4 so that it telescopes within conductor 27 and once again a gap is formed between jaw structure 24 and contact structure 26.
Referring more particularly to Figures 7-10, the second embodiment of this invention is illustrated as switch 100 which is connected as a disconnect switch for isolated phase bus of a type described in detail in copendlng application Ser. No. 353,301, filed May 6, 1953 and assigned to the assignee of the instant invention. Briefly, isolated phase bus comprises a hollow conductor 101 centered within a housing 102 and insulated therefrom by means of insulators 103. Hollow conductor 101 is large enough to permit pinion 105 to be mounted therein. Contact structure 106 is secured to the end of hollow conductor 101 at flange member 101 and a jaw structure (not shown) similar to jaw structure 24 of Figures 3 and 4 is secured to a second isolated phase conductor (not shown) which is in longitudinal alignment with conduc- 4 tor 101. A gap between the jaw structure and contact structure 106 will be bridged by switch blade 107 when switch 106 is in its closed position.
Contact structure 106 includes a housing 108 inside of which concave rollers 109 are rotatably mounted on shafts 109. Rollers 109 are provided since the great weight of blade 107 makes a sliding bearing contact impractical. Resilient contact fingers 119, which are secured to the outside of housing 108, have the free ends thereof extending through openings in housing 108 into wiping contact with blade 107. A rack 104 is secured to the inside of blade 107 together with strengthening members 108 which are positioned adjacent to longitudinal slots 129 and provide additional support for the walls of blade 107.
Pinion 105 is mounted on shaft 110 which is journalled in bearings 111 of contact structure housing 108. Pin 112 couples shaft 110 to rotatable insulator 103a, which extends from contact structure housing 108 to isolated phase bus housing 102. Rotatable insulator 103a is of substantially the same design as rotatable insulator 50 of Figure 2 and may be used to replace one of the insulator supports 103 in the region of switch 100. A stub shaft 113 extends from the housing end of rotatable insulator 103a and is later connected to the actuating means (not shown) for switch which may be of the same construction as the actuating means for switch 22.
It is to be noted that by mounting the rack 104 and pinion within the blade 107, the size of housing 108 may be substantially equal to the size of conductors 101 thereby providing a substantially uniform current distribution. In the same manner, isolated phase bus housing 102 need not be mis-shapened over the area into which blade 107 telescopes thereby simplifying electrostatic shielding at high voltages.
Although the present invention has been described with an exemplary form, it is to be understood that variations may be made within the broader spirit and scope of the invention, and it is not intended to be limited except as set forth in the following claims.
I claim:
1. An electric switch comprising a first structure, a second structure, a hollow elongated blade; said structures being fixed in axial alignment with a gap therebetween; said blade being disposed within said first structure and slideable along the axis thereof; said switch having a closed position wherein said gap is bridged by said blade and an open position wherein said gap is open; a rack secured to said blade and a pinion in operative engagement with said rack to move said blade along its axis and thereby operate said switch between said open and closed positions; said rack being positioned between the ends of said blade; both said rack and said pinion being disposed within said blade; said pinion having its axis of rotation positioned perpendicular to the longitudinal axis of said blade; said blade having a longitudinally extending slot; said pinion axis of rotation extending through said slot.
2. An electric switch comprising a first structure, a second structure, a hollow elongated blade; said structures being fixed in axial alignment with a gap therebetween; said blade being disposed within said first structure and slideable along the axis thereof; said switch having a closed position wherein said gap is open; a rack secured to said blade and a pinion having the teeth thereof in mesh with the teeth of said rack to move said blade along its axis and thereby operate said switch between said open and closed positions; an insulator having its axis in alignment with the axis of said pinion; one end of said insulator being in operative engagement with said pinion whereby a. rotational force applied to the other end of said insulator will be effective to operate said switch; said rack being positioned between the ends of said blade; both said rack and said pinion being disposed within said blade; said pinion having its axis of rotagss ass tion positioned perpendicular to the longitudinal axis of said blade; said blade having a longitudinally extending slot; said pinion axis of rotation extending through said slot.
3. An isolated phase bus structure comprising a first hollow conductor, a second hollow conductor, a bus housing, a plurality of insulators, a switch; said conductors being in axial alignment with a gap therebetween; said insulators being positioned between said conductors and said housing to center said conductors within said housing; said switch comprising a hollow elongated blade, a jaw, and a contact structure; said jaw being secured to said second conductor at an end thereof; said contact structure being secured to said first conductor at an end thereof; said blade being slidably disposed within said contact structure to move longitudinally into and out of said first conductor in a telescoping manner; said switch being movable between an open and a closed position; said blade being positioned across said gap and in engagement with said jaw when said switch is in said closed position; a rack secured to and positioned within said blade and a pinion disposed within said blade in operative engagement with said rack; a rotatable insulator being interposed between said pinion and said housing whereby actuating power may be transmitted to said switch; said longitudinal axis being in alignment with the axis of rotation of said pinion; said blade having a longitudinally extending slot; means connecting said longitudinal axis and said axis of rotation; said means extending through said slot and being positioned perpendicular to the longi tudinal axis of said blade.
4. An electric switch comprising a first structure, a second structure, a hollow elongated blade; said structures being fixed in axial alignment with a gap therebetween; said blade being disposed within said first structure and slideable along the axis thereof; said switch having a closed position wherein said gap is open; a rack secured to said blade and a pinion in operative engagement with said rack to move said blade along its axis and thereby operate said switch between said open and closed positions; said rack being positioned between the ends of said blade; both said rack and said pinion being disposed within said blade; said pinion having its axis of rotation positioned perpendicular to the longitudinal axis of said blade; said blade having a longitudinally extending slot; said pinion axis of rotation extending through said slot; said first structure including a plurality of conducting fingers having first ends thereof in wiping contact with the 6 exterior surface of said blade; said first structure also ifi cluding resilient means and at least one opening through which said first ends are urged by said resilient means iti= to contact with said blade.
5. An isolated phase bus structure comprising a first hollow conductor, a second hollow conductor, a bus housing, a plurality of insulators, a switch; said con= ductors being in axial alignment with a gap therebetwee'nj said insulators being positioned between said conductors and said housing to center said conductors within said housing; said switch comprising a hollow elongated blade, a jaw, and a contact structure; said jaw being secured to said second conductor at an end thereof; said contact structure being secured to said first conductor at an end thereof; said blade being slidably disposed within said contact structure to move longitudinally into and out of said first conductor in a telescoping manner; said switch being movable between an open and a closed position; said blade being positioned across said gap and in engagement with said jaw when said switch is in said closed position; a rack secured to and positioned within said blade and a pinion disposed within said blade in operative engagement with said rack; a rotatable insulator being interposed between said pinion and said housing whereby actuating power may be transmitted to said switch; said insulators longitudinal axis being stationary; said longitudinal axis being in alignment with the axis of rotation of said pinion; said blade having a longitudinally extending slot; means connecting said longitudinal axis and said axis of rotation; said means extending through said slot and being positioned perpendicular to the longitudinal axis of said blade; said rack being posi tioned between the ends of said blade; said contact structure including a plurality of conducting fingers having first ends thereof in wiping contact with the exterior surface of said blade; said contact structure also including resilient means and at least one opening through which said first ends are urged by said resilient means into contact with said blade.
References Cited in the file of this patent UNITED STATES PATENTS 1,968,869 Austin Aug. 7, 1934 2,179,636 Koehler Nov. 14, 1939 2,273,069 Rossman Feb. 17, 1942 2,517,435 Jensen Aug. 1, 1950
US660920A 1957-05-22 1957-05-22 Telescoping blade switch Expired - Lifetime US2889435A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3694592A (en) * 1971-02-11 1972-09-26 Westinghouse Electric Corp Isolating switch having improved separable contact assembly
US3700840A (en) * 1971-02-11 1972-10-24 Westinghouse Electric Corp Isolating switch
US4288667A (en) * 1978-11-01 1981-09-08 Westinghouse Electric Corp. Telescoping disconnect switch with rail-mounted telescope section
WO2012099919A1 (en) * 2011-01-19 2012-07-26 Actuant Corporation Air break electrical switch having a blade toggle mechanism
US9679721B2 (en) 2012-08-31 2017-06-13 Hubbell Incorporated Air break electrical switch having a blade toggle mechanism

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1968869A (en) * 1931-07-07 1934-08-07 Ohio Brass Co Electric switch
US2179636A (en) * 1936-03-09 1939-11-14 Charles H Koehler Electrical connector
US2273069A (en) * 1937-08-23 1942-02-17 Allen M Rossman Disconnecting switch
US2517435A (en) * 1946-07-31 1950-08-01 Ite Circuit Breaker Ltd Disconnect switch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1968869A (en) * 1931-07-07 1934-08-07 Ohio Brass Co Electric switch
US2179636A (en) * 1936-03-09 1939-11-14 Charles H Koehler Electrical connector
US2273069A (en) * 1937-08-23 1942-02-17 Allen M Rossman Disconnecting switch
US2517435A (en) * 1946-07-31 1950-08-01 Ite Circuit Breaker Ltd Disconnect switch

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3694592A (en) * 1971-02-11 1972-09-26 Westinghouse Electric Corp Isolating switch having improved separable contact assembly
US3700840A (en) * 1971-02-11 1972-10-24 Westinghouse Electric Corp Isolating switch
US4288667A (en) * 1978-11-01 1981-09-08 Westinghouse Electric Corp. Telescoping disconnect switch with rail-mounted telescope section
WO2012099919A1 (en) * 2011-01-19 2012-07-26 Actuant Corporation Air break electrical switch having a blade toggle mechanism
US10468213B2 (en) 2011-01-19 2019-11-05 Hubbell Incorporated Air break electrical switch having a blade toggle mechanism
US9679721B2 (en) 2012-08-31 2017-06-13 Hubbell Incorporated Air break electrical switch having a blade toggle mechanism
US10229800B2 (en) 2012-08-31 2019-03-12 Hubbell Incorporated Air break electrical switch having a blade toggle mechanism
US10741346B2 (en) 2012-08-31 2020-08-11 Hubbell Incorporated Air break electrical switch having a blade toggle mechanism

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