US2229504A - Switch construction - Google Patents

Description

Jan. 21, 19 41. P. B. HOYE v SWITCH CONSTRUCTION Filed Oct 30, 1939 5 Sheets-Sheet l I [mi/607F05 Peder B. Hgye Jan. 21, 1941. HOYE 2,229,504

SWITCH CONSTRUCTION Filed Oct. 30, 1959 5 Sheets-Shee t 2 f/vsuumozv E {1U GfTZOf" v Peder B. Hgye @y W v A Mm, M

Jan. 21, 1941. R a H YE 2,229,504

SWITCH CONSTRUCT ION Filed Oct. 30, 193 9 5 Sheets-Sheet 4 [IVSULA T/ON JNSULA /0/v v Pederflflo e 29 mW-M Jan. 21, 1941. P. B. HOYE 2,229,504

SWITCH CONSTRUCTION,

Filed Oct. 50, 1939 5 Sheets-Sheet s [IV-SUM r/o/v p: 5i 1 INSULATION 4 fnueni or federfl Hgya Patented Jan. 21, 1941 UNITED STATES SWITCH CONSTRUCTION Peder B. Hoye, Maywood, 111., assignor to Electrical Engineers Equipment 00., Melrose Park, 111., a corporation of Illinois Application October 30, 1939, Serial No. 301,899

13 Claims.

My invention relates, generally, to electric switch constructions and it has particular relation to switches of the disconnecting type for use in electric power distribution circuits.

The object of my invention, generally stated, is to provide a disconnecting switch construction that shall be simple and efficient in operation, safe to use, and which can be readily and economically manufactured and installed.

An object of my invention is to so arrange the installation in a gang operated disconnecting switch as to require a minimum of spacing between the terminals.

Another object of my invention is to provide an improved frame construction for a gang operated disconnecting switch by employing a one-piece panel member as the principal part.

Still another object of my invention is to provide for guiding a movable shelf carrying contact members within the one piece frame construction by providing guide channels on the inside of the ends of the frame for cooperation with guide members carried by the shelf.

Another object of my invention is to provide a relatively rigid frame construction for a disconnecting switch intended for mounting on a panel of insulating material.

A still further object of my invention is to provide for rear connecting of a disconnecting switch arranged for panel mounting.

A still further object of my invention is to provide for mounting the movable contact members of a disconnecting switch on a shelf that itself is formed of insulating material.

Another object of my invention is to provide a double throw disconnecting switch for panel mounting in which the movable contact members are carried by a shelf that itself is formed of insulating material.

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

My invention, accordingly, is disclosed in the embodiments thereof shown in the accompanying drawings, and it comprises the features of construction, combination of elements and arrangement of parts which will be exemplified in the constructions 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 my invention, reference may be had to the following detailed description taken in connection with the accompanying drawings, in which:

Figure 1 is a view, in front elevation, of a gang operated disconnecting switch having a one-piece frame construction and intended for use on circuits where the voltage is of the order of 5,000 volts, certain parts being broken away in order to more clearly show the details of construction; 5

Figure 2 is a longitudinal sectional view taken along the line 2-2 of Figure 1;

Figure 3 is a longitudinal sectional view taken along the line 3-3 of Figure 1;

Figure 4 is a view in front elevation of a panel 10 type of disconnecting switch adapted for use on circuits the voltage of which is the order of 600 volts, the upper and lower barriers being shown in section and a movable barrier being omitted in order to more clearly show the details of con- 15 struction;

Figure 5 is a view in end elevation of the switch shown in Figure 4;

Figure 6 is a longitudinal sectional view taken along the line 66 of Figure 4; and

Figure 7 is a perspective view showing a double throw type of disconnecting switch for panel mounting that is constructed generally along the lines shown in Figures 4, 5, and 6 of the drawings.

Referring now particularly to Figures 1, 2, and 25 3 of the drawings, it will be observed that the reference character It] designates a generally rectangular frame ID, the cross section of which is generally channel shaped. The frame I0 is formed in one piece by bending a suitable chan- 30 nel shaped metal member, the flanges of which are indicated at H, into the desired rectangular shape. In order to do this, portions of the flanges I I are removed at the corners and then, when the frame has been properly bent into shape, the abutting edges of the flanges H are welded together as indicated at [2. It is only necessary to complete the welds along the abutting edges l2 of both flanges II and to weld the abutting edges of the flat portions together along one corner in order to provide a rigid and relatively inexpensive frame that is comparatively light in weight. At the rear corners apertured lugs [3 are welded to permit mounting the frame I0 and the switch mechanism carried thereby on a suitable supporting structure such as a type frame or a well, as will be readily understood.

The frame I0 is provided with a top 14 and a bottom l5 that are provided respectively with aligned apertures l6 and I1, Figure 3.

It will be observed that three inverted cupshaped insulators l8 are provided having portions 19 projecting downwardly through the openings IS in the top M of the frame In. The insulators l8 may be formed of any suitable in- 55 sulating material such as a phenolic condensation product. Bolts 20, projecting through a flange integrally formed with the insulators l3 and through suitable apertures and the apertures it in the top M serve to hold the insulators !8 in position. Centrally located within each of the insulators I8 is a rode-like terminal 2! that is secured in position by means of a nut 22. It will be understood that connection to the rod-like terminals 2! is provided by means of suitable terminals that may be clamped in position by nuts 23, Figure 1.

With a view to facilitating the application of insulating tape to cover the projecting portions of the rod-like terminals 2! and the line terminal attached thereto, the upper ends of the insulators it are reduced, as indicated at 2 1. The tape can then be readily applied to the exposed metallic connections and extended over the reduced end portions 24, as will be readily understood.

On the underside of the bottom 5 of the frame 10 there are provided three upright cup-shaped insulators 2'! which are provided with portions 28 that extend upwardly through the respective apertures H. The insulators 2'! are also provided with flanges E9, spaced from the portions 28 forming therebetween an annular recess 30, Figure 3, the purpose of which will be presently apparent. Bolts 3! extending through flanges integrally formed with the insulators 21 and through suitable apertures in the bottom !5 serve to hold the insulators 2! in position. Mounted within each of the insulators 2?, shown in Figure 3, is a rodlike terminal 32, which, as shown, extends a substantial distance into the frame H] and beyond the upper end of the upwardly extending portion 28 of the insulator 21. The lower end of each rod-like terminal 32 is threaded and is secured in position in its insulator 2! by a nut 33. A nut 31, Figure 1, serves to clamp a line terminal thereto. The lower ends 35 of each of the insulators 2'! is reduced to facilitate taping as described hereinbefore.

Within the housing It and movable between the top !4 and bottom !5 is a shelf 38 that is preferably formed by Welding end plates 39 across the ends of angle members 40. It will be apparent that this will provide a rigid generally rectangular frame for receiving thereon three sleeve insulators 4!. The upper end 42 of each sleeve insulator 4! is tapered and is arranged to telescopically interfit within the corresponding inverted cup-shaped insulator l8 thereabout in the switch closed position. The lower end 43 of each of the sleeve insulators 4! is likewise tapered and is arranged to telescopically interfit with the corresponding upright cup-shaped insulator 2'! and to extend into the annular groove 30 in the switch open position. By providing the annular groove 30 in each of the lower upright cup-shaped insulators 2?, it is possible to substantially reduce the distance that would otherwise be required between the top M and bottom !5 of the frame l0. It will be obvious that proper clearance distances must be provided between the live parts of the switch and the frame and that when voltages of the order of 5,000 volts and above are employed the provision of the proper clearance presents quite a problem. The lower end 43 of each sleeve insulator 4! must be of suflicient length to overlap the upwardly extending portion 28 of the corresponding insulator 2'! when the switch is in the closed position. In the switch open position provision must be made for taking care of the depending portion 43 of each of the sleeve insulators 4!. At the same time proper creepage distance must be maintained between the lower rod-like terminals 32 and the frame It. By providing the flanged portions 29 on the upright cupshaped insulators 2! and the annular grooves 30 therein, a simple and satisfactory solution to this problem is provided.

Each of the sleeve insulators 4! is provided with an outwardly extending flange 44 through which bolts 45 project through suitable apertures in the angle members 4t for holding the sleeve insulators i! in position in alignment with the corresponding upper and lower insulators l8 and 21, as will be readily understood.

Within each of the sleeve insulators 4! and movable therewith is provided a sleeve contact member 46, the ends of which are longitudinally slotted as indicated at 41, Figure 3, to provide relatively flexible contact fingers 48 for engaging the corresponding rod-like terminals 2! and 32. Garter springs t9 surrounding the contact fingers G8 to serve to increase the contact pressure that is otherwise provided by the contact fingers 48 alone. It will be understood that the contact sleeve 46 always remains in engagement with the relatively long rod-like terminal 32 in both the switch open and the switch closed position. The circuit is closed and opened by engagement of the upper end of the contact sleeve 46 with the respective upper rod-like terminal 2!.

The contact sleeve 46 is threaded at 52 intermediate its ends and a collar 53 having a flanged lower end 54 is threaded thereon. A clamp nut 55 is threaded on the collar 53, as shown, to clamp the contact sleeve 46 in operative position on opposite sides of a flange 56 that extends in- Wardly from the sleeve insulator 4!.

It will be understood that the upright cupshaped insulators 2'! and the sleeve insulators l! are formed of material similar to that of which the inverted cup-shaped insulators. !8 are formed. As indicated hereinbefore, this may be a phenolic condensation product.

With a view to operating the shelf 38 from one position to another within the frame III, the end plates 39 are provided with pins 59 through which one end of links iii? are pivoted. The other ends of the links 69 are pivoted to pins 6! that are carried by links 62 at one end, the other ends being securely fastened, as by welding, to an operating shaft 63 which is mounted in bearings 64 that are carried by the ends 65 of the frame Hi. An operating arm or handle 66 is secured to one end of the operating shaft 63 to permit manual rotation thereof. A spring biased pin 6! cooperates with a pivotally apertured face plate 58 for locking the operating arm or handle 66 in either of the two extreme positions. Additional locking means are also provided as will be presently apparent.

The shelf 38 is guided in its movement Within the housing !0, in part, by heads 69 of the pins 59 sliding in guide channels 0 that are secured, as by welding, to the inner surfaces of the ends 65 of the frame HP. Additional guiding action is also provided by the contact sleeves 46 in sliding over their respective rod-like terminal members 32.

When the operating arm or handle 66 is rotated to the position shown in Figure l of the drawings, the links fifl-and 82 are rotated to move the shelf 38 and parts carried thereby upwardly. In this switch closed position the upper'ends of the contact sleeves 46 are in contact engagement with the respective rod-like terminals 2| while the lower ends, as described, remain in contact engagement with the elongated rod-like terminals 32. Also in this position the upper ends 42 of the sleeve insulators 4I telescope within the inverted cup-shaped insulators 'I 8. The links 60 and 62 provide an over-center toggle for, as shown in Figure 2 of the drawings, in the switch closed position, the pin 6! interconnecting the links 60 and 62 is moved to a position that is slightly beyond the line connecting the center of the pin 59 and the center of theshaft 63. This over-center toggle arrangement provides additional means for locking the switch in the closed position. Movement of the links 62 passed the center position is limited by stops II which may be formed of suitable metal members secured, as by welding, to the inside of the ends 65. Movement of the shelf 38 downwardly is limited by the engagement of the outer ends of the links 62 with the upper surface of the bottom I5 of the frame I0.

While the switch construction shown in Figures l, 2, and 3 is provided with three poles for three phase use, it will be apparent that any desired number of poles may be employed. For example, only two poles may be provided for single phase use. In some cases it may also be desirable to provide only a single pole switch construction. The only change that is required for the different numbers of poles, in general, is to change the length of the frame In and the length of the shelf 38. It will be obvious that the construction shown and described in Figures 1, 2, and 3 of the drawings is simple and compact and yet proper clearances and creepage distances are provided for high voltage circuits.

Referring now particularly to Figures 4, 5, and 6 of the drawings, it will be observed that a switch construction is there shown that is adapted to be mounted on a panel I5 of suitable insulating material such as slate, marble or ebony asbestos or other suitable insulating material. The switch construction shown in these figures is of the three pole type for connection in a three phase circuit operating at a relatively low voltage of the order of 600 volts. For this voltage it will be appreciated that the clearance and creepage distances are much less than are required for the high voltage switch construction shown and described in the preceding figures. While the switch construction shown in Figures 4, 5, and 6 of the drawings is of the three pole type, it will be readily understood that it might be of the two pole type for single phase circuit, or, if desired, of the single pole type.

A frame for the switch is provided, in part, by U-shaped strap iron frame members 16 and upper and lower insulator blocks 11 and I8 that are positioned, as shown, underneath and above the outwardly extending ends of the members I6 and secured in rigid spaced-apart relation by rods I9. When the flat portions of the frame members I6 are secured, as by bolts 80, to the panel I5, it will be observed that a rigid frame structure for the switch is provided by the parts just described. The upper and lower insulator blocks 1! and I8 may be formed of any suitable insulating material such as ebony asbestos. The rods I9 are threaded at their ends, as shown, and are secured in position by nuts threaded thereon, as will be readily understood.

As shown more clearly in Figure 6 of the drawings, the upper insulator block I1 carries rodlike terminal members 8I which project downwardly into recessed apertures 82 on the underside thereof. Nuts 83 serve to hold the terminal members 8I in position. It is desirable to provide for rear connecting the switch. This is effected by the use of rod-like terminal connectors 84 which extend through suitable apertures in the panel 15. Discs 85, of suitable insulating material such as a phenolic condensation product, are threaded onto the terminal rods 84 on the rear side of the panel I5 for holding them in position.

The lower insulator block I8 is likewise provided with rod-like terminals 88 which extend upwardly through recessed openings 89 on the upper side thereof. rod-like terminals 88 in position. Terminal rods 9|, extending through the panel I5 and held in position, in part, by threaded insulating discs 92 provide for rear connection to the terminals 88.

It will be understood that the terminals of the line conductors are positioned on the rearwardly extending terminal connectors 84 and 9| and that they may be secured thereon by suitable nuts 86 and 93 respectively.

Between the upper and lower insulator blocks TI and I8 there is provided a removable insulator block 98 which carries three contact sleeves 91. Contact sleeves 9l' are secured in position by nuts 98 that are threaded, as shown in Figure 6, on the central portion thereof and are disposed on opposite sides of inwardly extending flanges 99 integrally formed with the movable insulator blocks 96. The upper and lower ends of the contact sleeves 91 are slotted, as previously described, to provide relatively flexible contact fingers I00 but are further biased by garter springs IIJI into contact engagement with the rod-like terminals BI and 88. It will be understood that the contact sleeve 91 is always in contact engagement with the rod-like terminal 88 and that, on movement of the movable insulator block 96, it is moved into and out of engagement with the respective rod-like terminals 8|.

The movable insulator block 98 is guided in its movement between the upper and lower insulator blocks I1 and I8 by the rods I9 which project through suitable apertures near the ends which, while they are large enough to permit the movable insulator block 96 to freely slide, are still small enough to provide the desired guiding action. At the ends of the movable insulator block 98 there are provided generally C-shaped metal end members I04 that are secured in position by any suitable means, such as the transversely extending bolts I 85. Pins I86 extend from the end members IM for pivotally mounting one end of links I01, the other ends of which are pivotally mounted on pins I08 extending transversely through one end of links I89 that are secured at their other end to an operating shaft H0. The operating shaft I I8 is mounted in suitable bearings III that are carried by the frame members I6. An operating arm or handle II2 is also secured to the operating shaft III] for rocking the same. The links I89 are provided on one side with a boss H3 which is arranged to engage an adjustable stop II4 that is carried by a stepped support member II5 extending from the rear portion of the frame members I6. Also the other side of each of the links I09 is provided with a boss II6 which is arranged to engage an adjustable stop II! that is carried by a lug II8 extending from the lower arm of the frame member 16.

Nuts 90 serve to hold the When the operating arm handle H2 is moved to the position shown in Figures 4 and 6 of the drawings, the links ill? and W9, which in effect form a toggle linkage, are moved to such a position that the pin ti -8 interconnecting the links is moved to a position which is slightly beyond a line joining the center of the pin m6 and the center of the operating shaft fill. In this position the movable insulator block St has carried the contact sleeves i l into engagement with the respective rod-like terminals 2!. They are then securely locked in this position and will remain there until the operating arm or handle H2 is rotated to first move the links it? and H39 back past the dead center position, after which further movement will cause the movable insulator block at to move downwardly carrying with it the contact sleeves ill to the open circuit position.

It is desirable that the live parts of the switch be covered so that there is no likelihood of a person coming in contact with them. For this purpose barrier plates l2! are secured on opposite sides of the movable insulator block 96. In the switch closed position it will be observed that the barrier plates l2l overlap both the upper and the lower insulator blocks fl and 78 as shown in Figure 6. In the open circuit position, as shown in Figure 5, the barrier plates l2l move to positions slightly below the upper insulator block ll thereby permitting a visual inspection of the air gap that is present between the rod-like terminals Bi and the contact sleeves bl.

For the same purpose insulatirn barriers l22 are provided for covering the projecting ends of the rod-like terminals 8i and 2E and the portions of the terminal connectors 34 and 95 which extend from the front of the panel '45. They are held in position on the upper and lower insulator blocks Ti and I8 by any suitable means such as screws N3.

In Figure 7 of the drawings there is shown a three pole double throw switch construction which is generally similar to that shown in Figures 4, 5, and 6 of the drawings. A principal difference, however, resides in the construction of the contact members carried by the movable insulator block 9'6. As shown in Figure '7, the contact members carried by the movable insulator block 9% are provided at their upper ends with relatively flexible contact fingers that are biased inwardly by garter springs B27. The low ends are provided with rod-like portions for extending through contact sleeves, not shown, that are carried by the lower insulator block T8. The rod-like portions lZB are provided for engagement with the respective contact sockets I29 which, as shown, are provided with a plurality of relatively flexible fingers that are biased inwardly by garter springs lSll. It will be understood that the contact sleeves carried by the lower insulator block '58 are similar in construction to the contact sockets Hill, the details of which are generally shown. The contact sockets I29 are carried by suitable terminal studs I35 that extend through the panel lb. In the event that the contact sockets l29 are employed for grounding the circuit when the switch is in the open position, then the studs lSl will be commonly connected together and to ground.

Since it is obvious that further changes may be made in the above constructions and different embodiments of the invention may be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I claim as my invention:

1. In a switch, in combination, a one piece generally rectangular metal frame having an internal channel section with aligned openings in the top and bottom, inverted cup-shaped insulators carried by said top with portions projecting downwardly therethrough, upright cupshaped insulators carried by said bottom with portions projecting upwardly therethrough, a rod-like contact stud carried by each of said insulators, a shelf guided for movement within said frame between the top and bottom thereof, a plurality of sleeve insulators carried by said shelf and aligned with said insulators above and below for telescopic movement with respect to the same, a contact sleeve carried by each of said sleeve insulators always in engagement with the corresponding lower contact stud and movable into and out of engagement with the corresponding upper contact stud, and means for moving said shelf to move said contact sleeves into and out of contact engagement with said upper contact studs.

2. In .a switch, in combination, a one piece generally rectangular metal frame having an internal channel section with aligned openings in the top and bottom, inverted cup-shaped insulators carried by said top with portions projecting downwardly therethrough, upright cupshaped insulators carried by said bottom with portions projecting upwardly therethrough, a rod-like contact stud carried by each of said insulators, a guide channel secured to the inside of each end of said metal frame and extending vertically thereof, a shelf movable within said frame between the top and bottom thereof, a guide member at each end of said shelf projecting into and guided by the guide channel thereat, a plurality of sleeve insulators carried by said shelf and aligned with said insulators above and below for telescopic movement with respect to the same, a contact sleeve carried by each of said sleeve insulators always in engagement with the corresponding lower contact stud and movable into and out of engagement with the corresponding upper contact stud, and means for moving said shelf to move said contact sleeves into and out of contact engagement with said upper contact studs.

3. In a switch, in combination, a one piece generally rectangular metal frame having an internal channel section with aligned openings in the top and bottom, inverted cup-shaped insulators carried by said top with portions projecting downwardly therethrough, upright cupshaped insulators carried by said bottom with portions projecting upwardly therethrough, a rod-like contact stud carried by each of said insulators, a shelf guided for movement within said frame between the top and bottom thereof, a plurality of sleeve insulators carried by said shelf and aligned with said insulators above and below for telescopic movement with respect to the same, a contact sleeve carried by each of said sleeve insulators always in engagement with the corresponding lower contact stud and movable into and out of engagement with the corresponding upper contact stud, an operating shaft rockably mounted on the ends of said metal frame, a link pivoted to each end of said shelf and to a link secured to each end of said shaft, and an operating arm secured to said shaft for rocking the same to move said shelf and thereby said contact sleeves into and out of contact engagement with said upper contact studs.

4. Ina switch, in combination, a one piece generally rectangular metal frame having an internal channel section with aligned openings in the top and bottom, inverted cup-shaped insulators carried by said top with portions pro- J'ecting downwardly therethrough, upright cupshaped insulators carried by said bottom with portions projecting upwardly therethrough, a rod-like contact stud carried by each of said insulators, a guide channel secured to the inside of each end of said metal frame and extending vertically thereof, a shelf movable within said frame between the top and bottom thereof, a guide member at each end of said shelf projecting into and guided by the guide channel thereat, a plurality of sleeve insulators carried by said shelf and aligned with said insulators above and below for telescopic movement with respect to the same, a contact sleeve carried by each of said sleeve insulators always in engagement with the corresponding lower contact stud and movable into and out of engagement with the corresponding upper contact stud, an operating shaft rockably mounted on the ends of said metal frame, a link pivoted to each end of said shelf on said guide member thereat and to a link secured to each end of said shaft, and an operating arm secured to said shaft for rocking the same to move said shelf and thereby said contact sleeves into and out of contact engagement with said upper contact studs.

5. In a switch for mounting on a panel, in combination, a pair of U-shaped support members adapted to be secured to the panel in vertical spaced relation, upper and lower insulator blocks carried by the outstanding ends of said support members, guide rods extending through said ends of said support members and the ends of said insulator blocks thereat for securing the same in rigid spaced relation, sets of upper and lower stationary contact members carried by said upper and lower insulator blocks, an insulator block guided for movement on said guide rods between said upper and lower insulator blocks, contact members carried by the movable insulator block always in engagement with one set of said stationary contact members and movable into and out of engagement with the other set' of stationary contact members, and means for moving said movable insulator block to move said contact members carried thereby into and out of contact engagement with said other set of stationary contact members.

6. In a switch for mounting on a panel, in combination, a pair of U-shaped support members adapted to be secured to the panel in vertical spaced relation, upper and lower insulator blocks carried by the outstanding ends of said support members, guide rods extending through said ends of said support members and the ends of said insulator blocks thereat for securing the same in rigid spaced relation, sets of upper and lower stationary contact members carried by said upper and lower insulator blocks, terminals secured to said upper and lower sets of stationar Contact members and adapted to extend through said panel to permit rear connection to the switch, an insulator block guided for movement on said guide rods between said upper and lower insulator blocks, contact members carried by the movable insulator block always in engagement with one set of said stationary contact members and movable into and out of engagement with the other set of stationary contact members, and means for moving said movable insulator block to move said contact members carried thereby into and out of contact engagement with said other set of stationary contact members.

'7. In a switch for mounting on a panel, in combination, a pair of U-shaped support members adapted to be secured to the panel in vertical spaced relation, upper and lower insulator blocks carried by the outstanding ends of said support members, guide rods extending through said ends of said support members and the ends of said insulator blocks thereat for securing the same in rigid spaced relation, sets of upper and lower stationary contact members-carried by said upper and lower insulator blocks, terminals secured to said upper and lower sets of stationary contact members and adapted to extend through said panel to permit rear connection to the switch, an insulator block guided for movement on said guide rods between said upper and lower insulator blocks, contact members carried by the movable insulator block always in engagement with one set of said stationary contact members and movable into and out of engagement with the other set of stationary contact members, insulating barrier means covering substantially all live parts of the switch to prevent accidental contact therewith, and means for moving said movable insulator block to move said contact members carried thereby into and out of contact engagement with said other set of stationary contact members.

8. In a switch for mounting on a panel, in combination, a pair of U-shaped support members adapted to be secured to the panel in vertical spaced relation, upper and lower insulator blocks carried by the outstanding ends of said support members, guide rods extending-through said ends of said support members and the ends of said insulator blocks thereat for securing the same in rigid spaced relation, sets of upper and lower stationary contact members carried by said upper and lower insulator blocks, an insulator block guided for movement on said guide rods between said upper and lower insulator blocks, contact members carried by the movable insulator block always in engagement with one set of said stationary contact members and movable into and out of engagement with the other set of stationary contact members, an operating shaft rockably mounted on said U-shaped support members, a link pivoted to each end of said movable insulator block and to a link secured to each end of said shaft, and an operating arm secured to said shaft for rocking the same to move said movable insulator block and the contact members carried thereby into and out of contact engagement with said other set of stationary contact members.

9. In a switch for mounting on a panel, in combination, a pair of U-shaped strap iron support members adapted to be secured to the panel in vertical spaced relation, upper and lower in sulator blocks respectively underneath and upon the outstanding ends of said support members, guide rods extending through said ends of said support members and the ends of said insulator blocks thereat for securing the same in rigid spaced relation, upper and lower sets of stationary contact studs carried by said upper and lower insulator blocks, an insulator block guided for movement on said guide rods between said upper and lower insulator blocks, contact sleeves carried by said movable insulator block always in engagement with said lower set of contact studs and movable into and out of engagement with said upper set of contact studs, and means for moving said movable insulator block to move said contact sleeves carried thereby into and out of contact engagement with said upper set of contact studs.

10. In a switch for mounting on a panel, in combination, a pair of U-shaped strap iron support members adapted to be secured to the panel. in vertical spaced relation, upper and lower insulator blocks respectively underneath and upon the outstanding ends of said support members, guide rods extending through said'ends of said support members and the ends of said insulator blocks thereat for securing the same in rigid spaced relation, upper and lower sets of stationary contact studs carried by said upper and lower insulator blocks, terminals secured to said upper and lower sets of stationary contact studs and adapted to extend through said panel to permit rear connection to the switch, an insulator block guided for movement on said guide rods between said upper and lower insulator blocks, contact sleeves carried by said movable insulator block always in engagement with said lower set of contact studs and movable into and out of engagement with said upper set of contact studs, and means for moving said movable insulator block to move said contact sleeves carried thereby into and out of contact engagement with said upper set of contact studs.

11. In a switch for mounting on a panel, in combination, a pair of U-shaped strap iron support members adapted to be secured to the panel in vertical spaced relation, upper and'lower insulator blocks respectively underneath and upon 40 the outstanding ends of said support members,

guide rods extending through said ends of said support members and the ends of said insulator blocks thereat for securing the same in rigid spaced relation, upper and lower sets of stationary contact studs carried by said upper and lower insulator blocks, .an insulator block guided for movement on said guide rods between said upper and lower insulator blocks, contact sleeves carried by said movable insulator block always in engagement with said lower set of contact studs and movable into and out of engagement with said upper set of contact studs, an operating shaft rockably mounted on said U-shaped support members, a link pivoted to each end of said movable insulator block and to a link secured to each end of said shaft, and an operating arm secured to said shaft for rocking the same to move said movable insulator block and the con tact sleeves carried thereby into and out of contact engagement with said upper set of contact studs.

12. In a double throw switch for mounting on a panel, in combination, a pair of U-shaped support members adapted to be secured to the panel in vertical spaced relation, upper and lower insulator blocks carried by the outstanding ends of said support members, guide rods extending through said ends of said support members andthe ends of said insulator blocks thereat for securing the same in rigid spaced relation, a set of contact studs carried by said upper insulator block, a set of contact sleeves carried by said lower insulator block, a set of contact sleeves mounted below said lower insulator block and aligned respectively with said set of contact sleeves carried thereby, an insulator block guided for movement on said guide rods between said upper and lower insulator blocks, contact members carried by said movable insulator block each including ,a contact sleeve at its upper end for engagement with the respective contact stud carried by said upper insulator block and a contact stud at its lower end always in engagement with the respective contact sleeve carried by said lower insulator block and adapted to engage the respective contact sleeve of the set thereof disposed below said lower insulator block, and. means for moving said movable insulator block to move said contact members carried thereby into engagement with said contact studs in one position and to move them into engagement with said contact sleeves below said lower insulator block in the other position.

13. In a double throw switch for mounting on a panel, in combination, a pair of U-shaped support members adapted to be secured to the panel in vertical spaced relation, upper .and lower insulator blocks carried by the outstanding ends of said support members, guide rods extending through said ends of said support members and the ends of said insulator blocks thereat for securing the same in rigid spaced relation, a set of contact studs carried by said upper insulator block, a set of contact sleeves carried by said lower insulator block, a set of contact sleeves mounted below said lower insulator block and aligned respectively with said set of contact sleeves carried thereby, an insulator block guided for movement on said guide rods between said upper and lower insulator blocks, contact members carried by said movable insulator block each including a contact sleeve at its upper end for engagement with the respective contact stud carried by said upper insulator block and a contact stud at its lower end always in engagement with the respective contact sleeve carried by said lower insulator block and adapted to engage the respective contact sleeve of the set thereof disposed below said lower insulator block, terminals secured to the stationary contact studs and sleeves and adapted to extend through said panel to permit rear connection to the switch, and means for moving said movable insulator block to move said contact members carried thereby into engagement with said contact studs in one position and to move them into engagement with said contact sleeves below said lower insulator block in the other position.

PEDER B. HOYE.

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