US2917609A - Switch construction - Google Patents

Description

Dec. 15, 1959 J. J. MIKOS 2,917,609

SWITCH CONSTRUCTION Filed July 51. 1957 5 Sheets-Sheet 1 INVENTOR.

John J/Wdzog,

J. J. MIKOS SWITCH CONSTRUCTION 5 Sheets-Sheef 2 Dec. 15, 1959 Filed July 31, 1957 M, BY

t fiy lmu Dec. 15, 1959 J. J. MIKOS 2,917,609

SWITCH CONSTRUCTION Filed July 31, 1957 5 Sheets-Sheet 3 INVENTOR.

Dec. 15, 1959 J, M Kos 2,917,609

SWITCH CONSTRUCTION Filed July 31, 1957 5 Sheets-sheet 4 J. J. MIKOS SWITCH CONSTRUCTION Dec. 15, 1959 Filed July 31, 1957 5 Sheets-Sheet 5 QQEEQ INVENTOR. Jofzfi/ J/Vdsog, BY

' lowing detailed description,

United States Patent 2,917,609 SWITCH CONSTRUCTION John J. Mikos, Highland Park, Ill., assignor to & C Electric Company, Chicago, 111., a corporation of Delaware Application July 31, 1957, Serial No. 675,427 12 Claims. (Cl. 200146) This invention relates, generally, switches for high voltage application and it has particular relation to switches arranged to be opened by a load current interrupting tool or auxiliary circuit interrupter while they are carrying load current.

Among the objects of this invention are: To provide for opening a disconnecting switch of the type shown in US. Patent No. 2,351,826, issued June 20, 1944, modified as illustrated in US. Patent No. 2,621,272, issued December 9, 1952, by means of a load interrupter tool orauxiliary circuit interrupter constructed as disclosed in application Serial No. 569,909, filed March 6, 1956, now Patent No. 2,816,981, issued December 17, 1957, when the load interrupter devices of the first and second mentioned patents are removed; to provide a stationary anchor for one terminal of the load interrupter tool on the line terminal carrying the contact member that is engaged and disengaged by the switch blade when the switch is closed and opened; to mount the pull ring that is engaged by the other terminal of the load interrupter tool between the switch contact member and the pivot of the switch blade; to mechanically interconnect the pull ring and the latch lever whfch acts to unlatch the switch blade and permit opening thereof; to mount the pull ring on an arm extending from the latch lever; to provide a pair of anchors and a pair of pull rings to permit application of the load interrupter tool from opposite sides of the switch blade; to pivot the pull ring on the switch blade and connect it by a link to the latch lever; to provide lost motion between the link and latch lever; and to provide a single pull ring and a pair of anchors to receive the load interrupter tool from either side of the switch blade.

Other objects of this invention, will, in part, be obvious and in part appear hereinafter.

This invention is disclosed in the embodiment thereof shown in the accompanying drawings and it comprises the features of construction, combination of elements and arrangement of parts that will be exemplified by the construction hereinafter set forth and the scope of the application of which will be indicated in the appended claims.

For a more complete understanding of the nature and scope of this invention reference can be had to the foltaken together with the accompanying drawings, in which:

Figure l is a view, in side elevation, of a disconnecting switch in which the present invention is embodied and showing the application thereto of a load interrupter tool the details of which are disclosed in application Serial No. 569,909, filed'March 6, 1956, now Patent No. 2,816,981, issued December 17, 1957;

Figure 2 is a view, in front elevation, of the switch construction shown in Figure 1 having the load interrupter tool applied thereto;

Figure 3 is a view, at an enlarged scale, in front eleto disconnecting vation of the upper end of the disconnecting switch shown in Figure 1;

Figure 4 'is a view, in side elevation, of the upper disconnecting switch terminal and switch blade, the latter being moved toward the open position and the load interrupter tool being extended to a position where it is ready to trip and open the circuit;

Figure 5 is a view, similar to Figure 4, but showing the load interrupter tool in the full open position at which time the circuit has been opened thereby without arcing externally;

Figure 6 is a view, in side elevation, of a modified form of switch construction showing the application thereto of the load interrupter tool;

Figure 7 is a view, in front elevation, of the switch construction shown in Figure 6 with the load interrupter tool applied thereto; and

Figure 8 is a view, in side elevation, of the disconnecting switch shown in Figure 6 with the load interrupter tool being extended to a position where it is ready to trip and open the circuit.

Referring now particularly to Figures 1, 2 and 3 of the drawings it will be observed that the reference character 10 designates, generally, a disconnecting switch of the general type disclosed in US. Patent Nos. 2,351,826 and 2,621,272. It includes a channel base 11 which carries upper and lower line insulators 12 and 13. While the channel base 11 is shown in a vertical position, it will be understood that it can be located in an underhung position, if desired. The insulators 12 and 13 carry upper and lower line terminals 14 and 15 each of which includes a terminal pad 16 and 17 to permit connection of circuit conductors as is readily understood. Extending outwardly from the upper line terminal 14 is a contact member or switch tongue 18 while a hinge or fulcrum member 19 extends outwardly from the lower line terminal 15. A switch blade, shown generally at 20, is pivoted at 21 on the fulcrum member 19. As shown in Figure 3, the switch blade 20 includes blade members 22 and 23 which are spaced apart throughout the major portions of their length. At their upper ends they converge and carry downwardly extending auxiliary blade members 24 and 25 which engage opposite sides of the switch tongue 18 when the switch blade 20 is in the switch closed position. The auxiliary blade members 24 and 25 are biased into contact engagement with the switch tongue 18 by means of springs 26 and 27 which surround a bolt 28 that extends not only through the blade members 24 and 25 but also through the converging upper ends of the blade members 22 and 23.

It is desirable to lock the switch blade 20 in the closed position. For this purpose the two-way lock mechanism shown in Patent No. 2,351,826 can be used. The application of this lock mechanism to the disconnecting switch 10 is illustrated more clearly in Figure 1 of the drawings. As there shown a notch 31 is provided in the upper side of the switch tongue 18 for receiving the lower end of a latch bolt 32. The latch bolt 32 is slidably mounted between the auxiliary blade members 24 and 25. It is provided with a slot 33 near its lower end through which a guide pin 34, carried by the auxiliary blade members 24 and 25, extends. The latch bolt 32 is biased downwardly by a coil compression spring 35 which reacts against a bolt 36 which extends through the upper ends of the auxiliary blade members 24 and 25 and also through the upper ends of the blade members 22 and 23.

Rockably mounted on the bolt 36 is a latch lever 37 the lower end of which These bifurcated end which receive pins 40 bers 22 and 23 and auxiliary blade members 24 and 25. Shoulders 41 on the latch lever 37 underlie the lateral sides of a head portion 42 which is integral with the latch bolt 32. At the upper end of the latch lever 37 is an integrally formed eye 43 for receiving a prong of a switch stick. It will be understood that the latch lever 37 can be rocked about the bolt 36 in one direction or the other and, when such rocking movement occurs, one or the other of the shoulders 41 engages the corresponding side of the head portion 42 and moves the latch bolt 32 upwardly against the biasing force of the spring 35 to a position sufiicient to remove the lower end from the notch 31. On opening movement, this permits the switch blade 20 to be swung to the open position and on closing movement this permits the lower end of the latch bolt 32 to. clear the upper edge of the switch tongue 18 and permit the switch blade 20 to be moved to the fully closed position.

Also formed integrally with the upper line terminal 14 is a socket member 46. As described in Patent No. 2,621,272 the socket member 46 is arranged to removably receive a load interrupter device which is intended to be stationarily mounted on and become a part of the disconnecting switch 10. When such a load interrupting device is employed, it is operated automatically by movement of the switch blade 20 to the open position to effect the final opening and initial closing of the circuit, thereby avoiding arcing externally between the switch blade 20 and the switch tongue 18. In some applications the expense involved in the use of the load interrupter device permanently attached to the disconnecting switch is unwarranted. Accordingly, instead of employing it the load interrupter tool or auxiliary circuit interrupter of the type shown in application Serial No. 569,909, filed March 6, 1956, can be employed.

The load interrupter tool or auxiliary circuit interrupter is shown, generally, at 47 and only a general description thereof will be set forth herein. It will be noted that the load interrupter tool 47 is mounted on a live line insulating stick 48 of the type ordinarily found in a linemans truck and adapted to have various types of live line tools clamped thereto. At its upper end the live line stick 48 is provided with a metallic fitting 49 for detachable connection to a metallic strut 50. Near the upper end the strut 50 is provided with a laterally extending prong 51 which is arranged to engage one of two eyes or pull rings 52 which are carried by and formed integrally with the lower ends of arms 53 which depend from base portions 54 that are secured by bolts 55 to the opposite sides of the latch lever 37. This construction is shown more clearly in Figure 3 of the drawings and perrnits the application of the load interrupter tool to the disconnecting switch 10 from either side of the switch blade 20. Detents extending outwardly from the lower end of each of the arms 53 engage the inwardly directed portions of the blade members 22 and 23 for limiting the inward movement of the arms 53 when a closing force is applied to one or the other of the pull rings 52 for moving the switch blade 20 to the closed position. A keeper 59 cooperates with the prong 51 to prevent it from slipping out of the eye 52 in which the former is positioned. Movable with the strut 50 and prong 51 is an inner insulating sleeve 60 which moves within an outer insulating sleeve 61 for the purpose of cocking a spring operated mechanism to effect the separation of contact members within the load interrupter tool 47 in such manner as to interrupt the current flow within it without external arcing and without the formation of an are between the switch blade 20 and the contact member or switch tongue 18 when the former is moved away from the latter. Near its upper end the outer insulating sleeve 61 carries a conducting part including a bow contact member 62 which is arranged to be placed over and anchored to a hook shaped end 630i ananchor member 64 which is secured to and projects outwardly from the upper line terminal 14. It will be observed that two stationary anchor members 64 are provided, one on each side of the switch blade 20, for receiving the bow contact member 62 on either side.

In describing the operation of the disconnecting switch 16, it will be assumed that the switch blade 20 is in the closed position as illustrated in Figures 1, 2 and 3 of the drawings. The lineman manipulates the live line stick 48 to position the bow contact member 62 over one of the hook shaped ends 63 of the stationary anchor member 64. In the drawings the hook shaped end 63 on the right hand side of the disconnecting switch 10 is engaged by the bow contact member 62. Also, the live line stick 48 is manipulated to swing the strut 50 so as to position the prong 51 within the eye or pull ring 52 where it is prevented from becoming detached by the keeper 59.

Next the lineman exerts a longitudinal pull on the live line stick and moves the strut 50 together with the prong 51 and eye or pull ring 52 outwardly. This rocks the latch lever 37 in a counterclockwise direction about the pivot bolt 36 and raises the latch bolt 32 out of the notch 31. This movement is accompanied by a slight movement of the inner insulating sleeve 60 out of the outer insulating sleeve 61. The swinging movement of the latch lever 37 relative to the switch blade 26 continues until the right hand pin 40, Figure 1, is engaged by the bottom of its arcuate slot 39. Thereafter, since the latch bolt 32 has been withdrawn from the notch 31, the latch lever 37 moves unitarily with the switch blade 2".) toward the open position.

Figure 4- shows an intermediate position of the switch blade 20. Here it will be observed that the switch blade 2?; has been separated from the contact member or switch tongue 18. This takes place without arcing since these parts are shunted through the load interrupter tool 47. Here the load interrupter tool 47 is shown in the position where its contacts are ready to be tripped for opening the circuit without arcing externally.

in Figure 5 the continued movement of the switch blade 20 in the opening direction is shown and here the inner insulating sleeve 6% of the load interrupter tool 47 has been withdrawn sufiiciently to trip the contacts and open the circuit. By this time the switch blade has been moved sufiiciently far away from the upper line terminal 14 that there is no likelihood of the are restriking directly between the switch blade 26 and any part of the upper line terminal 14. The arrangement and construction of the load interrupter tool 47 is such that the are, under normal operating conditions, will not be restruck within it.

When the inner insulating sleeve 60 has been withdrawn to the position shown in Figure 5 a latch 65, Figure 2, operates automatically to hold the inner insuiating sleeve 66* in the extended position against the biasing action of the internal spring. Following the opening of the circuit by the load interrupter tool 47, as shown in Figure 5, the lineman can disengage the bow contact member 62 from the hook shaped end 63 of the stationary anchor member 64 by moving the live stick 43 in a reverse direction through a slight extent. After the bow contact member 62 has been removed from the hook shaped end 63, the switch blade 20 can operated to the full open position by the live line stick since the prong 51 still is in engagement with the eye or pull ring 52. By rotating the live line stick 48 about its longitudinal axis, the keeper 59 is disengaged from the eye or pull ring 52 and the prong 51 can be removed to disengage the load interrupter tool 47 completely from the disconnecting switch 10.

When the switch blade 20 is to be closed, such action can be accomplished by inserting a prong of a conventional switch stick in the eye 43 on the latch lever 37 and swinging it in a counterclockwise direction to lift the latch bolt 32 and swing the switch blade 20 into engagement with the contact member or switch tongue 18. On release of the latch lever 37, it'returns to the position shown in Figure 1 under the action of the spring 35 and the latch bolt 32 engages the notch 31.

Alternatively the switch blade 20 can be closed by inserting the prong of a switch stick in one or the other of the eyes or'pull rings 52 and swinging the switch blade in a counterclockwise direction to closed position. Under these circumstances the detents 56 engage the adjacent edges of the blade members 22 and 23 and move conjointly therewith toward the switch closed position. Since the head portion 42 on the latch bolt 32 can move independently of the latch lever 37, it is automatically moved upwardly when the lower and inner edge engages an inclined forward face 18 of the contact member or switch tongue 18. As soon as the switch blade 20 has been swung to the closed position where the lower end of the latch bolt 32 registers with the notch 31, it is automatically moved into locking engagement therewith by the spring 35.

Referring now to Figures 6, 7 and 8 of the drawings, it will be observed that another switch construction is illustrated which can be operated to the open position by the load interrupter tool 47. This switch construction includes upper and lower line insulators 66 and 67 which, it will be understood, are mounted on a suitable base, such as the base 11, previously described. The line insulators 66 and 67 carry, respectively, upper and lower line terminals that are shown, generally, at 68 and 69. Each includes a terminal pad 70 and 71 for receiving line conductors. The upper line terminal 68 includes a contact member or switch tongue 72 while the lower line terminal 69 has a hinge or fulcrum member 73 extending therefrom for carrying a switch blade that is shown, generally, at 74. The switch blade 74 is pivoted at 75 on the hinge or fulcrum member 73 and it includes a pair of spaced apart blade members 76 and 77. it will be observed that the blade members 76 and 77 are arranged to engage opposite sides of the hinge or fulcrum member 73 and also opposite sides of the contact member or switch tongue 72 when the switch blade 74 is in the switch closed position shown in Figures 6 and 7.

In order to hold the switch blade 74 in the closed position the upper line, terminal 68 is provided with a stationary latch detent 80 with which a latch hook S1 cooperates. The latch hook 81 is located at one end of a latch lever 82 which is pivoted at 83 to the upper end of the switch blade 74, between the blade members 7677, and on the side of the contact member or switch tongue 72 away from the hinge or fulcrum member 73. A-spring 84 cooperates with the latch lever 82 for biasing the latch hook 81 to the latching position as shown in Figure 6. Pivoted at 85 to the other end of the latch lever 82 is a link 86. The link 86 is pivoted at its upper end to the latch lever 82 and at its lower end it is pivoted at 87 to an arm 88 which has an eye or pull ring 89 formed integrally therewith. The arm 88 is pivoted at 90 between the blade members 76 and 7'? of the switch blade 74. At its upper end the link 86 has a slot 91 which permits a limited lost motion of the latch lever 82 with respect to the link 86.

It will be observed that the prong 51 of the load interrupter tool 47 is arranged to engage the eye or pull ring 89 in the manner described hereinbefore where the eye or pull ring 52 of the disconnecting switch is engaged and operated b' the load interrupter tool 47.

In order to restrain movement of the bow contact member -62 a generally U-shaped anchor member, shown generally at 94, is employed. It is secured, as shown in Figure 7, at the central portion by rivets 95 to the upper line terminal 68. The anchor member 94 includes outstanding arms 96 the outer ends 97 of which are hook shaped for receiving on either side of the switch blade 74 the bow contact member 62.

While two forms of disconnecting switch construction have been illustrated in the drawings, it will be understood that other disconnecting switch constructions can be employed in practicing this invention.

In describing the operation of the switch construction shown in Figures 6, 7 and 8, it will be assumed that the switch blade 74 is in the closed position shown in Figures 6 and 7. The lineman manipulates the live line stick 48 to position the bow contact member 62 over one of the hook shaped ends 97 and then further manipulates it to position the prong 51 in the eye or pull ring 89. Figure 7 shows the hook shaped end 97 on the right hand side being engaged by the bow contact member 62. Then an outward pull is exerted on the live line stick 48. As a result the prong 51 swings the eye or pull ring 89 and the arm 88 on which it is mounted in a clockwise direction through an extent sufficient to rock the latch lever82 through the link 86 in a similar direction and move the latch hook 81 out of the path of relative movement with the latch detent 80. Continued movement of the eye or pull ring, as described, positions the pivot 87 in substantial alignment with the pivot 90 so that further endwise pull on the live line stick 48 causes the switch blade 74 to swing in a clockwise direction away from the contact member or switch tongue 72. The separation thereof takes place without arcing since, as previously described, the circuit is shunted through the load interrupter tool 47.

As shown in Figure 8, switch blade 74 continues. 47 has been operated to contacts are ready to be movement. As described hereinbefore, the continued outward movement of the live line stick 48 results in the opening of the circuit by separation of the contacts within the load interrupter tool 47. The subsequent opening operation of the switch blade 74 is essentially as described above for the switch blade 20.

When the switch blade 74 is to be swung to the closed position, the prong of a switch stick is inserted in the eye or pull ring 89. The switch blade 74 is then swung in a counterclockwise direction to the closed position. Because of the slot 91 in the upper end of the link 86, as the switch blade 74 approaches the contact member or switch tongue 72, the latch lever 82 is permitted to rock in a clockwise direction as the latch hook 81 engages the latch detent and rides over it. Subsequently the spring 84 automatically rocks the latch lever 82 to the latching position shown in Figure 6.

Since certain further changes can be made in the foregoing switch construction and different embodiments of the invention can be made without departing from the spirit and scope thereof, it is intended that all matter shown in the accompanying drawings and described hereinbefore shall be interpreted as illustrative and not in a limiting sense.

What is claimed as new is:

1. A disconnecting switch comprising, in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with said contact member, a latch lever pivoted to the other end of said switch blade on the side of said contact member away from said hinge member, latch means interposed between said latch lever and said other terminal for holding said switch blade closed, a pull ring adjacent said contact member on the side toward said hinge member when the the opening movement of the Here the load interrupter tool a position where the internal switch is closed, means interconnecting said pull ring andsaid latch lever to unlatch said latch means and swing said switch blade to open position, and an anchor member carried by said other terminal having an anchor portion aligned with said pull ring generally transversely of said switch blade in closed position for receiving one terminal or a load interrupter tool while the other terminal thereof engages said pull ring.

tripped on a further opening 2. A disconnecting switch comprising, in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with said contact memher, a latch lever pivoted to the other end of said switch blade on the side of said contact member away from said hinge member, latch means interposed between said latch lever and said other terminal for holding said switch blade closed, a pull ring adjacent said contact member on the side toward said hinge member when the switch is closed, means interconnecting said pull ring and said latch lever to unlatch said latch means and swing said switch blade to open position, and an anchor member carried by said other terminal and having an anchor portion on the side of the center of said pull ring away from said hinge member for receiving one terminal of a load interrupter tool while the other terminal thereof engages said pull ring.

3. A disconnecting switch comprising. in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with sa d contact member, a latch lever pivoted to the other end of said switch blade on the side of said contact member away from said hinge member, latch means interposed between said latch lever and said other terminal for holding said switch blade closed, an arm rigidly extending from said latch lever toward said hinge member and carrying a pull ring so as to position it between said hinge member and said contact member when the switch is closed to unlatch said latch means and swing said switch blade to open position, and an anchor member carried by said other terminal for re eiving one terminal of a load interrupter tool while the other terminal thereof engages said pull ring.

4. A disconnecting switch comprising, in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with said contact member, a latch lever pivoted to the other end of said switch blade on the side of said contact member away from said hinge member, latch means interposed between said latch lever and said other terminal for holding said switch blade closed, an arm rigidly extending from each side of said latch lever toward said hinge member each carrying a pull ring so as to position the same between said hinge member and said contact member when the switch is closed to unlatch said latch means and swing said switch blade to open position, and anchor members carried by said other terminal on opposite sides of said switch blade in closed position either of which is capable of receiving one terminal of a load interrupter tool while the other terminal thereof engages the corresponding pull ring.

5. A disconnecting switch comprising, in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with said contact member, a latch lever pivoted to the other end of said switch blade on the side of said contact member away from said hinge member, latch means interposed between said latch lever and said other terminal for holding said switch blade closed, an arm rigidly extending from said latch lever toward said hinge member and carrying a pull ring so as to position it between said hinge member and said contact member when the switch is closed to unlatch said latch means and swing said switch blade to open position, stop means cooperating with said arm and switch blade for limiting the movement of the former relative to the latter when said switch blade is swung to closed position by force transmitted through said pull ring, and an anchor member carried by said other terminal for receiving one terminal of a load interrupter tool while the other terminal thereof engages said pull ring.

6. A disconnecting switch comprising, in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with said contact member, a latch lever pivoted to the other end of said switch blade on the side of said contact member away from said hinge member, latch means interposed between said latch lever and said other terminal for holding said switch blade closed, an arm rigidly extending from each side of said latch lever toward said hinge member each carrying a pull ring so as to position the same between said hinge member and said contact member when the switch is closed to unlatch said latch means and swing said switch blade to open position, a detent extending from each arm into cooperative relation with said switch blade for limiting the movement of the former relative to the latter when said switch blade is swung to closed position by force transmitted through either pull ring, and anchor members carried by said other terminal on opposite sides of said switch blade in closed position either of which is capable of receiving one terminal of a load interrupter tool while the other terminal thereof engages the corresponding pull ring.

7. A disconnecting switch comprising, in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with said contact member, a latch lever pivoted intermediate its ends to the other end of said switch blade and having a latch hook at one end, a latch detent on said other terminal for receiving said latch hook to hold said switch blade closed, a pull ring pivoted to said switch blade between said latch lever and said hinge member, a link pivoted at one end to the other end of said latch lever and at its other end to said pull ring, and an anchor member carried by said other terminal for receiving one terminal of a load interrupter tool while the other terminal thereof engages said pull ring.

8. A disconnecting switch comprising, in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with said contact member, a latch lever pivoted intermediate its ends to the other end of said switch blade on the side of said contact member away from said hinge member and having a latch hook at one end, a latch detent on said other terminal for receiving said latch hook to hold said switch blade closed, a pull ring pivoted to said switch blade between said contact member and said hinge member in switch closed position, a link pivoted at one end to the other end of said latch lever and at its other end to said pull ring, and an anchor member carried by said other terminal for receiving one terminal of a load interrupter tool while the other terminal thereof engages said pull ring.

9. A disconnecting switch comprising, in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with said contact member, a latch lever pivoted intermediate its ends to the other end of said switch blade and having a latch hook at one end, a latch detent on said other terminal for receiving said latch hook to hold said switch blade closed, a spring biasing said latch lever, and said latch hook carried thereby into latching engagement with said latch detent, a pull ring pivoted to said switch blade between said latch lever and said hinge member, a link pivoted at one end to the other end of said latch lever and at its other end to said pull ring, there being a lost motion connection between said link and said other end of said latch lever to permit movement thereof independent of said link and against the biasing action of said spring, and an anchor member carried by said other terminal for receiving one terminal of a load interrupter tool while the other terminal thereof engages said pull ring.

10. A disconnecting switch comprising, in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with said contact member, a latch lever pivoted intermediate its ends to the other end of said switch blade and having a latch hook at one end, a latch detent on said other terminal for receiving said latch hook to hold said switch blade closed, a pull ring pivoted to said switch blade between said latch lever and said hinge member, a link pivoted at one end to the other end of said latch lever and at its other end to said pull ring, and an anchor member stationarily mounted on said other terminal on the side of said contact member toward said hinge member for receiving one terminal of a load interrupter tool while the other terminal thereof engages said pull ring.

11. A disconnecting switch comprising, in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with said contact member, a latch lever pivoted intermediate its ends to the other end of said switch blade and having a latch hook at one end, a latch detent on said other terminal for receiving said latch hook to hold said switch blade closed, a pull ring pivoted to said switch blade between said latch lever and said hinge member, a link pivoted at one end to the other end of said latch lever and at its other end to said pull ring, and anchor members carried by said other terminal on opposite sides of said switch blade in closed position either of which is capable of receiving one terminal of a load interrupter tool while the other terminal thereof engages said pull ring.

12. A disconnecting switch comprising, in combination, a pair of line terminals mounted in insulated spaced relation with a hinge member carried by one terminal and a contact member carried by the other terminal, a switch blade pivoted at one end to said hinge member for movement into and out of engagement with said contact member, a latch lever pivoted to the other end of said switch blade on the side of said contact member away from said hinge member, latch means interposed between said latch lever and said other terminal for holding said switch blade closed, a pull ring positioned between said hinge member and said contact member when the switch is closed and operatively connected to said latch lever to unlatch said latch means and swing said switch blade to open position, and an anchor member stationarily mounted on said other terminal for receiving one terminal of a load interrupter tool while the other terminal thereof engages said pull ring.

References Cited in the file of this patent UNITED STATES PATENTS 1,856,313 Brennan May 3, 1932 2,498,250 Cole Feb. 21, 1950 2,671,145 Lindell Mar. 2, 1954

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