US1866333A - Inclosed electric switch - Google Patents

Description

July 5, 1932.

ms 2 0 m 1/ M". B. WOOD INCLOSED ELECTRIC SWITCH Filed Jan. -2,- 1929 3 Sheets-Sheet l I 6 n t wk I r i h July 5, 1932- M. B. WOOD INCLOSED ELECTRIC SWITCH SSheets-Sheet 3 Filed Jan. 2, 1929 I //llllllllll q\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\N\\\\ \h Patented July 5, 1932 UNITED STATES PATENT OFFICE MORRIS B. WOOD, OF SOMERVILLE, MASSACHUSETTS, ASSIGNOR TO CONDIT ELECTRICAL MANUFACTURING CORPORATION, OF SOUTH BOSTON, MASSACHUSETTS, A CORPORA- TION OF MASSACHUSETTS INCLOSED ELECTRIC SWITCH Application filed January 2, 1929.

' to be raised and lowered to move the contact terminals thereof into and out of engagement with cooperating fixed line terminals which are located within and. carried by the cell structure.

It is highly desirable to mount the control mechanism for the switch on the movable portion, thereof so that it can be withdrawn from the vicinity of the high tension conductors in the cell for inspection and repairs, and consequently the actuating mechanism for the switch, as the opening and closing electromagnets, and the control relays therefor, are mounted on apanel carried by the switch truck. Cooperating movable and stationary contact members are carried by the switch and cellwhereby automatically to make and break electrical circuits for said apparatus by the corresponding vertical movements of the switch to and from circuit controlling position. The number of cooperating pairs of these secondary contact members may be very great, sometimes as many'as forty being required, and due to slight in accuracies in the cell and truck construction, it frequently happens that some of the secondary contacts do not make proper engagement, or that some do not engage at all.

It is an object of this invention to provide a draw-out electric switch having self-aligning secondary contact members; and specifically to provide cooperating secondary contact members carried by the switch and cell, one of which is resiliently mounted on its support and the other of which has a lost motion connection with its support, whereby it can be moved on its support into engagement with its cooperating resiliently supported contact member.

It is a further object of the invention to provide means responsive to the vertical movements of the switch to and from circuit controlling position to move said cooperating secondary contact members positively into engagement irrespective'of any misalignment Serial No. 329,744.

of the contact members upon initial engagement thereof.

The horizontally directed force exerted against the switch truck by the combined spring pressures of the secondary disconnect contacts when in engagement is frequently sufficient to cause the switch to roll on its wheels and consequently to move the switch so far out of position as to prevent the proper engagement of the vertical line-disconnects of the switch. i

It is therefore a further object of the invention to provide aconstruction wherein the force of the spring pressed secondary contact members is exerted against the fixed or movable unit which carries them, rather than ing its vertical movement to and from circuit controlling position in its cell.

A yet further object is generally to improve the construction and performance of vertically movable draw-out circuit interrupters and particularly the secondary contact structures therefor.

Another object is the provision of means to guide the circuit interrupter for movement into and out of engagement with its line terminals or disconnects, and means independent of said guiding means to insure en gagement of the cooperating secondary contact members.

Fig. 1 is a side elevation of an electric switch and the secondary contact structure therefor embodying the invention, the inclosing cell for the switch being shown in section. Fig. 2 is a sectional view on lines 22 of Fig. 1, showing a plan view of the cooperating contact members and the supporting structure therefor.

Fig. 3 is an enlarged view of the secondary contact members of Fig. 1, the position of the truck panel being shown by dotted lines in both the test position and in its lowermost posit-ion partially withdrawn from the cell.

Fig. 4 is a side elevation of the supporting frame for the fixed contact members.

Fig. 5 is a side elevation of a cam member.

Fig. 6 is a perspective detail showing a cooperating cam and pin for effecting the engagement of the contact members.

The inclosing cell structure for the switch comprises the back wall 10, the top wall 12, and the front wall 14, which latter wall is carried by and is movable with the switch and comprises the front closure for the cell when the switch is disposed therein. A pair of insulating bushings 16 extend through and are carried by the top wall 12, and support the conducting studs 18. Said studs are provided with lower extended end-portions 20 which constitute the stationary switch members of a pair of disconnecting switches of which the exposed terminals of the switch form the movable members. Said studs 18 are connected electrically at their upper end with line conductors 22.

The switch or circuit interrupter shown is of the oil immersed type and comprises an inclosing casing consisting of the oil containing receptacle 2d, and the switch frame 26 which forms a closure for the top of said oil receptacle. Stationary switch members 1nclu ding insulating bushings 28 and their central conducting studs 29 are carried by said switch frame and extend ther-ebelow into the oil receptacle and also extend above said switch frame. At their upper ends said studs 29 are provided with contact clips 30 which comprise the movable switch members of the aforesaid line disconnecting switches.

The switch is adapted to be supported above the floor of the cell at a number of different elevations and to this end is provided with raising and lowering means. Said means comprise essentially pairs of crossed arms or levers, 32 and 34, a pair being located on each side of the switch. Said arms are provided their lower ends with switch sup porting rollers 36 and at their upper ends are connected pivotally with a channel frame 38 which is connected fixedly to the switch frame by the tie bolts 40. Said arms 3e are pr vided with a lost motion connection with said channel frame, androllers l2 are carried thereby which are adapted to bear against and roll along the inner face of said channel frame. The lower ends of said arms 32 and 3 1- are operatively connected by a shaft is having a screw threaded connection at one end with the lower ends of arms 32 and having at its other end an operative connection 46 with a manually operated crank (not shown).

The interrupter is raised and lowered by rotating the shaft 44. It will be apparent that when the shaft 44 is rotated in one direction, the lower ends of bars 32 and 34: will be drawn toward each other thus to raise the illterrupter; and that when the shaft is rotated in the other direction, the lower ends of the arms will be moved apart thus to lower the interrupter. The interrupter is shown in Fig. 1 in full raised position wherein the stationary and movable terminals 20 and 30 of the line disconnecting switch are in engagement. lVhen in the full lowered position the terminals of the interrupter will be at a lower position wherein they will be clear of the line terminals and the interrupter can be moved horizontally from the cell upon the wheels 36.

Means is also provided to lock the raising and lowering means against operation except when the interrupter is in the open position. Said means comprises a vertical locking bar 48 which is adapted to engage an aperture in a member 50 whicn is slidable in the frame 38 as the arms 32 and 3st are moved to raise and lower the switch. Said locking bar 4-8 is pivotally connected with a cam plate 52 which is pivoted at 5% to the switch frame 26, and an operatinglever 56 is also pivotally connected with said plate at 58. A cam 60 is connected operatively with the switch operating mechanism and said cam and the cam plate cooperate to prevent the improper operation both of the switch and the raising and lowering mean The above elevating means for the switch and the interlocking means are described more fully and are claimed in my copending application Serial No. 281.151,

filed May 28. 19 28 and need not be further described herein.

It is desirable to mount as much as is possible of the electrical control apparatus, as the switch closing and opening mechanism a, auxiliary switch 6. and control relay 0, on the movable unit whereby it can be removed from the vicinity of the high tension wiring in the cell by withdrawing the switch therefrom. Cooperating secondary contact members carried by the switch cell are provided to connect and disconnect the electrical circuits of the aforesaid apparatus autoznatt cally by the vertical movement of said switch in the cell.

The stationary contact members of said secondary disconnects are mounted on a fixed vertical panel 62 which depends beneath the top wall 12 at the front of the cell. As shown most clearly in Figs. 2 and 3, a pair of spaced vertical supporting angles 64; are secured by means of bolts 65 to the front face of said panel 62. Said angle-supports are'provided with aligned horizontally extended upper and lower slots 66 and 68 within which pins 70 and 72 of the contact supporting frame are adapted to be slidably received. Said contact supporting frame (see Figs. 2, a and 6). which is adapted to be disposed between and supported by said vertical angles 6st, comprises a pair of similar spaced side members each having the upper and lower horizontal arms 74 and 76 and a vertically disposed connecting member 78 which is welded to said horizontal arms to form a unitary structure. Said side members are also provided with a the Wall 14 by means of bolts 102.

pair of integral ledges intermediate their ends on which the vertically spaced insulating, as spaced wooden, cross bars 82 and 84 are adapted to rest and to which they are secured by screws at 85. The frame-supporting pins 7 0 and 72 are secured at the top and bottom thereof and extend outwardly therebeyond into the slots 66 and 68 of said frame supporting angles, whereby to permit a substantial horizontal movement of said contact supporting frame on its support. A sec ond pair of pins 86 and 88 are also secured to the extended ends of the upper and lower horizontal arms 74 and 76, the purpose of which will be hereinafter set forth. As shown in Fig. 2 the several stationary contact members 90 of the secondary disconnects are mounted on and insulated from each other by the cross bars 82 and 84, two identical banks or sets of contact members being thus provided one above the other. Said contact members are connected to various control circuits in a more or less usual manner.

. The front Wall 14 of the movable unit is provided with an offset portion 92 in the vicinity of the panel 62 of the cell whereby to provide an enlarged space for the movable contact members 91 which cooperate with the stationary contact .members 90. An apron 94 carried by the cell structure overlaps the offset portion 92 of wall 14 whereby to provide a closure for the front of the cell regardless of the vertical position of the switch therein.

The movable contact members of the secondary disconnects are adapted to be mounted on the inner face of said wall 14 and in vertical alignment with the stationary contact members 90 of the cell. As shown in Fig. 2, spaced vertical angles 96 and 98 are secured to the inner face of wall 14 above the offset portion 92 thereof. A single contact carrying cross bar 100 of wood or other insulating material is secured to the backs of said angles and to Said bar is arranged to be parallel with the bars 82 of the stationary cont-act members and the movable contact members 91 are suitably fas tened thereto in spaced relationand in alignment with their corresponding cooperating fixed contacts 90. Said movable contact members comprise the flat contact faces 104 having reflexed upper and lower ends and integral flanges'106 by which they are adapted to be supported. Said movable contact members are arranged to be supported. resiliently on their insulating cross bar 100 and to this end said cross bar is provided with a pair of inwardly directed brackets 108 and 110 tothe extended ends of which the similar ends of arms 112 are loosely pivotally connected through a pin and slot connection. Said arms 112 are pivotally connected at their other endswith the flange 106 ofthe contact member by pins 105. Resilient means as the springs 114 are provided about the pivot pins 105, the extended ends of which act against the arms 112 and a pin 113 carried by flange 106 of the contact member whereby constantly to urge said contact member horizontally in a direction to engage its cooperating stationary contact member. The above arrangement by which the movable contact members are supported loosely through the pin and slot connection to provide for a limited universal movement thereof, whereby they can align themselves with the flat contact face of their cooperating stationary contact members, is claimed and more fully described in a copending application of T. M. Wood, Serial No. 92,371, filed March 4, 1926, which has eventuated into Patent No. 1,790,690, and assigned to the assignee of this application.

The spaced vertical angles 96 and 98 are further provided with 'cam supporting brackets 116 (Fig. 5), which are secured by bolts 118 to the outer faceof said angles 96 and 98 and extend inwardly toward the panel 62. Said brackets are spaced apart sufliciently to permit the extended ends of pins 86 and 88 carried by the stationary contact supporting frame to pass freely therebetween as the switch is moved vertically upward. Said brackets 116 have secured to their inner surfaces and at their extended ends, as by weld: ing, the cam members 120. Said cam members are each provided with upper and lower angularly related cam surfaces 122 and an intermediate dwell surface 124 over which the pins 86 and 88 of said stationary contact supporting frame are adapted to pass during the vertical movement of the switch in its cell. The relation of the pins 86 and 88 to the cam members 120 of the movable unit is shown most clearly in Figs. 3 and 6.

Means, in addition to the elevating mechanism, are provided to guide the switch in its vertical movement in the cell. Said means may comprise a pair of brackets 126 (Fig. 1) one of which is disposed on each side of the switch frame 26. Each of said brackets is provided with a vertical slot 128 in which a vertical guide strip (not shown) carried by the cell wall is adapted to be received as the switch is moved upwardly.

In the position shown in Fig. 1 the switch is in its normal operative position with the main line disconnects thereof in engagement and the movable secondary contact 91 thereof in engagement with the upper bank of fixed secondary contact 90 which contacts comprise the service contacts for the auxiliary circuits. When the switch is lowered by means of the switch lowering means above described, the movable secondary contacts 91 move downwardly therewith until in position to engage the lower bank of fixed sec ondary contacts 90 which contacts connect the control equipment on the switch with testing circuits.

The position of the front wall let when the test contacts are thus in engagement is indicated in F 3' by the dotted lines at A. Further lowering of the switch causes these contacts to disengage and the top of wall 1% to be below the apron 9st of the cell structure, in which position the switch can be withdrawn from the cell, as indicated by the dotted lines at B (Fig.

Due to the floating support of the stationary contact supporting frame, it is evident that as the switch is raised sufficicntly to cause the lowermost pins 88 to ride over the angular cam surfaces 122 the frame will yield on its support, permitting the flat contact faces of the fixed contact members to align themselves with the corresponding contact faces of the movable contact members, and that as the pins 88 travel over the cam faces and onto the dwell faces 124 thereof the fixed contact members will be moved in a general horizontal direction toward the yielding movable contacts, causing them to yield and stress the springs 11% thereof, whereby to press the cooperating contacts firmly together. It is obvious that during the afore said horizontal movement, which may be substantially equal to the distance which the pins 70 and 72 are free to move in slots 66 and 68 respectively, any irregularities in the alignment of the several pairs of cooperating contacts will disappear.

By this arrangement, the spring pressure of the movable secondary disconnects is eX- erted, not against the cell structure, but instead against the cams 120 carried by the movable switch unit itself and consequently no horizontally directed force acts against the switch tending to roll it on its wheels. Due to the floating support for the fixed contacts and the universal support for the movable contacts, which is provided by the loose fit of its supporting pins in the slotted arms 112, the complete engagement of the cooperating fiat contact faces of each set of contacts is insured even though considerable misalignment may existbetween the cell and switch structures. Due to the horizontal movement of the fixed contact members, during which they are n: ved against the yielding springs 114, the engagement of all cooperating sets of contacts is assured even though they may not make simultaneous initial engagement.

The construction and arrangement may be modified in many ways without departing from the scope of the invent-ion.

I claim:

1.. In an electric switch gear of the vertical draw-out type having operating mechanism for the main switch contacts carried by the movable portion thereof, the combination of relatively fixed and movable secondary contact members carried by the fixed and movable portions thereof having cooperating vertical contact faces which have wiping engagement during the movement of said movable draw-out portion, and means operative during the engagement of said secondary contact members to urge bot-l1 said fixed and said movable contact members positively toward each other into pressure engagement.

2. In an electric switch gear of the vertical draw-out type having operating mechanism for the main switch cont-acts carried by the movable portion thereof, the combination of relatively fixed and movable secondary contact members carried by the fixed and movable portions thereof having cooperatin vertical contact faces which have wiping engagement during the movementof said movable draw-out portion, and cooperating means carried by said fixed and movable portions to urge both said fixed and said movable secondary contact members laterally into pressure engagement.

3. In an electric switch gear of the vertical draw-out type having operating mechanism for the main switch contacts carried by the movable portion thereof, the combination of relatively fixed and movable secondary contact members carried by the fixed and movable portions thereof having coopcrating vertical contact faces which have wiping engagement during the movement of said movable draw-out portion, and coopcrating means carried by said fixed and movable portions operative in response to the vertical movement of said draw-out portion to move both said fixed and movable secondary contact members horizontally into engagement.

4;. In an electric switch gear of the vertical draw-out type having operating mechanism for the main switch contacts carried by the movable portion thereof, the combination of relatively fixed and movable sec ondary contact members carried by the fixed and movable portions thereof having cooperating vertical contact faces which have wiping engagement during the movement of said movable draw-outportion, and camoperated means responsive to the vertical movement of said draw-out portion arranged to force both said fixed and said movable contact members in opposite directions toward each other.

5. In an electric switch gear of the drawout type having the operating mechanism for the main switch carried by the movable portion, relatively fixed and movable secondary contact members carried by the fixed and movable portions thereof having cooperating vertical contact faces, one of said contact members having a resilient connection with its support and its cooperating contact member having a lost-motion connection with its support, and cooperating means int carried by said fixed and movable portions and responsive to the movement of said movable portion arranged to move said coopcrating contact on its support into engagement with and against the resilience of said resilient contact member.

6. In a vertical draw-out switch the combination of a contact supporting frame carried by the fixed portion thereof and having a floating connection therewith, a plurality of fixed secondary disconnect contact members carried by said supporting framehaving vertical contact faces, a plurality of vertically aligned cooperating contact members carried by said movable portion, said coopcrating contact members having a resilient support, and means including a cam member carried by said movable portion and disposed in, position to engage a projection of said frame during the vertical movement of said movable portion, whereby to move said frame and the contact members carried thereby positively into engagement with said'cooperating contact members.

7. In an inclosed electric switch gear of the draw-out t we havin a movable ortion' b which is adapted to be moved horizontally and thereafter vertically into circuit controlling position, the combination of a contact supporting frame carried by and having a floating connection with said fixed portion, a plurality of sets of horizontal aligned contact members carried by and insulated from said frame, said sets being arranged one above the other and with the several contact members thereof in vertical alignment, a set of cooperating contact members carried yieldingly by said movable portion, a cam member carried by and movable vertically with said movable portion, cooperating cam engaging members carried by said frame in the vicinity of each set of contact members thereon, said cam being arranged during the vertical movement of said movable portion to engage said members and efi'ect a positive horizontal movement of said frame on its. support, whereby to effect the engagement of the adjacent cooperating fixed and movable contact members.

8. In an inclosed draw-out electric switch having a fixed portion and a movable portion which is movable horizontally and thereafter vertically into circuit controlling position,

the combination of a vertical panel carried by said fixed portion, a frame carried by and having an upper and lower lost-motion sup-e port on said panel, whereby it is free for l1m-' ited horizontal movement thereon,upper and lower horizontal contactsupporting bars carried by said frame, a plurality of fixed secondarydisconnect contact members carried by said bars having vertical contact faces,a

single horizontal contactsupporting bar car-' ried by said movableportion, movable secondary disconnect contact members carried ment with the fixed contact members of said fixed portion, said movable contact members having individual resilient supports on their contact supporting bar, a rearwardly extended arm carried by said movable portion, upper and lower forwardly extended arms carried by said frame, a cam member carried by the arm of said movable portion having a forwardly directed cam face, and cam engaging projections carried by the forwardly extended arms of said frame and disposed in position to engage said cam face successively during the upward movement of said movable portion to effect the horizontal movement of said frame and the contacts carried thereby.

9. In a vertical draw-out switch the combination of two horizontally-spaced vertical contact-supporting portions one of which is vertically movable, a I contact-supporting frame carried by the fixed portion and having a horizontal lost-motion connection therewith, a horizontal contact-supporting bar carried by said frame, a similar horizontal contact-supportingbar carried by said movable portion, cooperating fixed and movable secondary disconnect contacts carried by said bars and having vertical contact faces, the contact members of said movable portion having a resilient support, an arm carried by said movable portion and extended in the direction of said frame, a cam member carried by said arm in the vicinity of said frame having upper and lower divergent cam faces and an intermediate vertical dwell face, and a projection carried by said frame adapted to engage said cam and dwell faces during the vertical movement of said movable portion whereby to move said frame and the contact members carried thereby into and out of engagement with their cooperating resilient contact members during the vertical move ment of said switch.

10. In a draw-out electric switch, the combination with the fixed and. movable portions thereof, of a relatively stationary con-' tact member having a vertical contact face carried by said fixed portion and free to move a limited distance horizontally thereon, a yieldingly supported cooperating contact member carried by said movable portion having a vertical contact face adapted to make wiping engagement with the vertical face of said fixed contact member, and means operable during such movement to move said stationary contact member on its support in a direction to engage and move said cooperating contact member against its yielding suport. p 11. In a switch of the draw-out type, the combination with the fixed and movable portions thereof, of a contactsupporting member carried by said jfixed portion and having me ans for limited horizontal movement thereon, a plurality of stationary contact members carried by said member, each having a vertical contact face, a contact supporting member carried by said movable unit, a plurality of movable contact members carried thereby having vertical contact faces adapted to engage the corresponding vertical aces of said stationary contact members, said movable contact members having a resilient connection with their supporting member wherecontact supporting member horizontally on its support in a direction to urge said sta-- tionary and movable contact members into engagement.

12. In a draw-out switch having a fixed portion and a vertically movable portion, the combination of a contact supporting frame having a floating support on said fixed portion, relatively stationary contact members carried by said frame, a contact supporting member having a rigid support on said movable portion, movable contact members having a resilient support carried by said member in position to cooperate with said stationary contact members, a cam member carried by said movable member, and means car ried by said frame arranged to engage said cam member during the movement of said movable portion into contact engaging position, whereby to move said frame and consequently said stationary contact members into engagement with said resilient movable contact members.

13. In a draw-out switch the combination of cooperating fixed and movable contactmembers carried by and having a lost motion connection with the fixed and movable portions thereof, said contact members having aligned vertical contact faces adapted to make sliding engagement during vertical movement of said movable portion, resilient means urging one of said contact members in a direction to engage its cooperating con tact member, and means operative during the movement of said movable portion to urge the other of said contact members into alignment with and against said resilient contact member.

14. In a vertical draw-out electric switch the combination with the fixed and movable portions, of a contact supporting frame havment of said fixed and movable contact ment bers arranged to move said frame on its supportin a direction to urge the contact members carried thereby into engagement with their cooperating contact members.

15. In an electric switch of the draw-out type, the combination of a plurality of sets of cooperating contact members carried by the stationary and movable portions thereof, the contact members of one of said sets having resilient supporting means urging them in a direction perpendicular to the line of movement of the switch during its movement into circuit controlling position, and the set of cooperating contact members being free for movement in the same direction, and means operative during the movement of the switch into circuit controlling position to engage and move said set of cooperating contact members positively into engagement with said resilient contact members and also to continue said movement against the resilience of said contact, whereby to insure the engagement of all cooperating contact members.

16. In an electric switching apparatus hav- "ig relatively fixed and vertically movable portions, a contact member carried by said fixed portion having a vertical contact face, a contact member carried by said movable portion having a cooperating vertical contact face which is arranged to be moved into confronting relation with the contact face of said fixed portion during the movement of saic movable portion, resilient means for supporting one of said cooperating contact members yieldingly, and interconnecting means having an operative engagement with both said fixed and movable portions arranged to cooperate to effect a horizontal pressureengagement of said cooperating contact members without exerting a horizontal pressure on the movable portion of said switching apparatus.

17. In an electric switching apparatus having relatively fixed and vertically movable portions, a contact member carried by said fixed portion having a vertical contact face, a contact member carried by said movable portion having a cooperating vertical contact face which is arranged to make wiping engagement with the contact face of said fixed portion during the movement of said movable portion, said fixed contact member having a lost-motion connection with said fixed portion and said movable contact member having a yielding connection with said movable portion, and means associated with said fixed and movable portions arranged to cooperate to move said fixed contact member horizontally on its support into pressure engagement with its cooperating contact member during the vertical movement of said movable portion.

18. In an electric switching apparatus having relatively fixed and vertically movable portions, a. contact member carried by said fixed portion having a vertical contact face, a contact member carried by said movable portion having a cooperating vertical contact face which is arranged to make wiping engagement with the contact face of said fixed portion during the movement of said movable portion, said fixed contact member having a lost-motion connection with said fixed portion and said movable contact member having a yielding connection with said movable portion, and cam-actuated means associated with one of said contact members arranged to cooperate with a cam member associated with said other contact member to urge said fixed contact member horizontally into engagement with said yielding movable contact member.

19. In an electric switching apparatus having fixed and movable portions, a vertical contact member carried by a fixed portion thereof, both of said contact members being free for limited horizontal movement on their supports, a cooperating vertical contact member carried by a movable portion thereof, means to move said movable portion vertically whereby to effect a wiping engagement of said contact members, and means effective during the vertically-engaging movement thereof to urge both said cooperating contact members also horizontally on their supports into pressure engagement.

20, An electric switching apparatus having a fixed portion, a cooperating portion vertically movable in relation thereto, a frame having a floating support on said fixed portion, contact members carried by and insulated from said frame and having flat vertical contact faces, cooperating vertical contact members carried by and having a resilient connection with said movable portion, a cam member carried by and movable with said movable portion which is arranged to cooperate with a projection on said frame to move said frame and the contact members thereon into engagement with said resilient movable contact members and thereafter to move said frame and its contact members against the resilience of said movable contact members.

21. The combination of an inclosing structure and a truck type switch which is movable into and out of said structure and also is adapted to be elevated therein, line disconnects carried by both said structure and switch which are adapted to be engaged when the switch is in elevated position, cooperating sets of secondary contacts carried by said structure and switch respectively which'are adapted to be engaged and disengaged by vertical movement of the switch, and pressure-applying means which acts in opposite directions on both sets of contacts to establish a horizontally-directed engaging pressure between said cooperating sets of contacts while maintaining the switch free from such pressure. I

' 22. The combination of an inclosing structure and a truck type switch which is movable into and out of said structure and also is adapted to be elevated therein, line disconnects carried by both said structure and switch. which are adapted to be engaged when the switch is in elevated position, cooperating sets of secondary contacts-carried by said structure and switch respectively which are adapted to be engaged and disengaged by vertical movements of the switch, one set of secondary contacts having a support which is free for horizontal and is fixed against vertical movement, and means operable to move said support toward the other set of secondary contacts due to vertical movements of said switch.

23. The combination of a fixed support, a switch vertically movable with respect to said support, a secondary switch having cooperating contact members carried respectively by said switch and support, one of said contact members being movable vertically with said switch and the other being movable horizontally on said support, and means responsive to vertical movement of the switch to move said horizontally-movable member into engagement with said cooperating member.

24:. The combination of a fixed support, a switch vertically movable with respect to said support, a secondary switch having cooperating contact members carried respectively by said switch and support, one of said contact members being movable horizontally on said fixed support, and means responsive to vertical movement of said switch to move said horizontally-movable contact member toward the cooperating contact member and to establish contact therebetween.

25. The combination of an inclosing structure, a switch movable vertically within said structure and also horizontally into and out thereof, secondary contact members carried by the front of said structure above said switch, a cover plate carried by said structure in front of said contact members, and a plate carried by said switch in front of said contact members, said plates being overlapping to inclose said contact members, except in the lowermost vertical position of said switch.

26. Electric switch gear including an inclosing structure having fixed line terminals, a truck-type switch having switch terminals and wheels on which the switch is movable into and out of engagement with said line terminals, and auxiliary stationary and movable contacts carried respectively by said structure and switch above said wheels, spring-means acting to urge said contacts into engagement, and means operated by a movement of the switch for urging both of said contacts toward each other and for counter-acting the action of said spring means on the switch t prevent said spring means from exerting a tilting effect on the switch. 2?. Electric switch including a stationary structure having contacts, a movable truck-type switch having wheels on which the switch on its wheels is movable and contacts which are engageable with said strucm titre-contacts by 1110ve1nent of the switch, spring-means which urge both of said con tacts toward each other, and means engaging both the stationary structure and the switch at the line of contact engagement for counter-acting the action of said springmeans on the switch to prevent said springmeans from exerting a tilting efi ect on the switch.

28. An electric switch having stationary contacts, movable contacts, spring-means for pressing said contacts into engagement, a movable structure which carries said stationary contacts and against which said spring means acts when the switch is closed in a 0 direction to move said contacts apart, and means carried by the SWiLCll which draws said structure toward said movable contacts and which counter-acts the action or" said spring means on said movable structure. In testimony whereof, I have signed my name to this specification.

MORRIS B. XVOOD.

CERTIFICATE OF CORRECTION.

Patent No. 1,866,333. July 5, 1932.

MORRIS B. WOOD.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 7, lines 23 to 25, claim 19, strike out the words "both of said contact members being free for limited horizontal movement on their supports," and insert the same after "thereof," in line 26, of same claim; page 8, line 8, claim 27, strike out the words "on its wheels" and insert the same to follow "switch" in line 10, same claim; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 1st day of November, A. D. 1932.

M. J. Moore, (Seal) Acting Commissioner of Patents.

CERTIFICATE 6F IGRREUTIUN Patent No. 1,866,333. July 5, 1932.

MORRIS B. WOOD.

it is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 7, lines 23 to 25, claim 19, strike out the words "both of said contact members being free for limited herizentai movement on their supports, and insert the same after "thereof," in line 26, of same claim; page 8, line 8, claim 27, strike out the words "en its wheels" and insert the same to follow "switch" in line 10, same claim; and that the said Letters Patent should be read with these corrections therein that the same may conform to the recertl of the ease in the Patent Office.

Signed and sealed this lst day of November, A. D. 1932.

M. J. Moore, (Seal) Acting Commissioner of Patents.

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