US3260808A - Electric switch with lockable rotary operator - Google Patents

Description

July 12, 1966 H. M. DIMOND ETAL 3,260,808

ELECTRIC SWITCH WITH LOCKABLE ROTARY OPERATOR Original Filed Sept. 15, 1961 3 Sheets-Sheet 1 FIGZ INVENTORS- HERBERT M.D|Mo-o, GEORGE E.GAu-rmza- ATTORNEY July 12, 1966 DlMOND ETAL 3,260,808

ELECTRIC SWITCH WITH LOCKABLE ROTARY OPERATOR Original Filed Sept. 15, 1961 3 Sheets-Sheet 2 u s2- U 33 FIG 3 INVENTOR HERBERT M.D|Mo-o, GEORGE E.GAUTHIER BY W 6 7 A TTORNEY July 12, 1966 H. M. DlMOND ETAL 3,250,808

ELECTRIC SWITCH WITH LOCKABLE ROTARY OPERATOR Original Filed Sept. 15. 1961 3 Sheets-Sheet 5 FIG? 5m N WM NT n B R E H GEORGE E.GAUTHIER BY NEY ATTOI? United States Patent 3,260,808 ELECTRIC SWITCH WITH LOCKABLE ROTARY OPERATOR Herbert M. Dimond, West Hartford, and George E.

Gauthier, Plainville, Conn., assignors to General Electric Company, a corporation of New York Original application Sept. 15, 1961, Ser. No. 138,526, now Patent No. 3,192,334, dated June 29, 1965. Divided and this application Nov. 4, 1964, Ser. No. 408,938

2 Claims. (Cl. 200-42) This application is a division of application Serial No.

138,526, filed September 15, 1961, now Patent No. 3,192,- 334, issued June 29, 1965, and is assigned to the same assignee as the aforesaid application. The present invention relates to electric switches and circuit breakers, and particularly to electric switches and circuit breakers of the type including an oscillatible or toggle type operating member and a rotary or twist type manually engageable handle member connected to the toggle type operating member by an adapting mechanism. More particularly, the invention relates to such switches and circuit breakers which are adapted for use with an enclosure having a cover overlying all portions of the switch except the manually engageable handle portion, and interlock means operated by the enclosure cover and by the manually engageable handle for preventing actuation of the switch and/ or opening of the cover under certain predetermined conditions.

7 An electric circuit breaker construction comprising a conventional molded-case circuit breaker and a separable adapting operating mechanism is disclosed in copending application Serial No. 138,363, filed September 15, 1961, now Patent No. 3,171,908, issued March 2, 1965, and assigned to the same assignee as the present invention. The basic circuit breaker includes a toggle-type operating mechanism, and the adapting mechanism provides a rotatable or twist-type handle as well as handle and cover interlocking means.

It is an object of the present invention to provide an enclosed switch or circuit breaker of the type shown in the aforementioned application which shall be highly dependable in operation, inexpensive to manufacture, and which shall provide the desired locking and interlocking functions. It is a more specific object of the present invention to provide a rotary type handle having a simplified, attractive, and readily accessible locking means for locking the handle in any desired angular position.

In accordance with the invention, a switch operating mechanism is provided including a rotary type handle surrounded by a raised locking or guard ring. The handle includes a sl-idable' locking bolt which is movable radially outwardly of the handle, and the guard ring is provided with a clearance notch or notches at locations corresponding to the angular positions such as on and off at which it is desired to lock the handle. The slidable bolt has an opening therein to receive a padlock to pre vent movement of the bolt inwardly when in a desired locking position.

The invention will be more fully understood from the following detailed description, taken in conjunction with accompanying drawings, and its scope will be pointed out in the appended claims.

' In the drawings,

FIGURE 1 is a perspective view of an enclosed switch or circuit breaker incorporating the invention;

FIGURE 2 is an exploded perspective view of the basic switch mechanism and accompanying adapter mechanism of the device of FIGURE 1;

FIGURE 3 is a side elevation view of the switching device and adapting mechanism of FIGURE 1, together 3,260,808 Patented July 12, 1966 with a portion of the enclosure cover, showing particularly the interlocking mechanism;

FIGURE 4 is a fragmentary view showing portions of the interlocking mechanism, showing a first construction;

FIGURE 5 is a view similar to FIGURE 4, showing an improved construction;

FIGURE 6 is a sectional view of the adapter mechanism of FIGURES 1 and 2;

FIGURE 7 is a bottom plan view of the adapter mechanism of the invention, and

FIGURE 8 isa plan view of the handle escutcheon or mounting plate.

In the drawings, the invention is shown as embodied in an enclosed electric circuit breaker incorporating an enclosure or box 10 having a cover 11 and enclosing an electrical control device comprising a molded case circuit breaker 12 having an operating handle 13, and a removable operating adapter mechanism 14.

The operating mechanism 14, as shown more particularly in FIGURES 3-8, comprises a supporting pan or base 15 having a projecting flange 16 and mounting tabs 17 by which the plate is adapted to be fixedly mounted on the circuit breaker 12 by suit-able means such as by means of screws 17A.

Referring to FIGURE 7, the operating mechanism includes a first operating lever 18 which is pivotally supported on the plate 15 by being bolted to the shaft of a V rotatable handle member 40.

The operating lever 18 is connected, by means of a pin 18a in a slot 19a, to a second operating plate 19. The plate 19, in turn, is pivotally supported on the base 15 by means of a pivot pin 20, to which it is retained by means of a retaining washer 2011.

The plate 19 includes a pair of spaced apart upstanding studs 21 which are adapted to engage the operating handle 13 of the circuit breaker 12 when the mechanism 14 is mounted thereon.

Thus rotational movement of the external operating handle 19' causes swinging movement of the plate 19 by means of the pin and slot connection 18a, 19a, which in turn acts on the operating handle 13 through the agency of the studs 21 to operate the handle 13 in an oscillating fashion.

For the purpose of providing various interlocking functions to be described, an interlock lever 22 is provided which is pivotally supported on the pan 15 by means of a stud23. The stud 23 is non-rotatably fixed to the lever 22 and is rotatably supported in the pan 15. The interlock lever 22 is biased counterclockwise about the pivot pin 23 as viewed in FIGURE 7 by means of a tension spring 24. The lever 22 projects through an irregular elongated opening 25 having an enlarged portion providing a step or shoulder 26 in a wall member 15A of the pan 15 (see FIGURES 3-5). The lever 22 also carries a pair of spaced studs 27 and 2 8 projecting upwardly toward the inner surface of pan 15, for purpose to be described. The stud 23 has an enlarged head 29 above the surface of the pan 15, and carries a compression spring 30 which exerts a compressive force between the lever 22 and a retaining washer 31 carried by the stud 23. The effect of the spring 30 is to surge the lever 22 upwardly against the upper surface of the opening 25, and to urge the stud 23 downwardly, pressing the head 29 against the upper surface of the pan 15.

For cooperation with the interlock lever 22, the cover 11 of the enclosure is provided with a stationary catch catch 32. When the operating handle is moved toward on position, the lever 22 is permitted to move to the left as viewed in FIGURE 3 to the latched condition, and enters the slot 34 in the catch 32. This prevents the opening of the cover 11 unless the interlock is defeated in a manner to be described.

For the purpose of permitting the defeat of the interlock mechanism, the stud 29 is made accessible through an opening 36. Through this opening, a screwdriver may be inserted to manually twist the stud 23 and thereby retract the lever 22 against the bias of the spring 24, permitting opening of the cover. When the handle is moved to off position, however, a projection 37 on the plate 19 engages the stud 27 on the lever 22 and rotates the lever 22 to the right as viewed in FIGURE 3, withdrawing it from the position in which it would latch with the catch 32. Thus the cover may be opened when the switch is in the oif position without the necessity of defeating an interlock.

It will thus be observed that according to the present invention there is provided a cover interlock mechanism, whereby the cover may not be inadvertently opened while the switch is in the on position, that is, it is necessary to defeat a releasable interlock before opening the cover, but nevertheless the cover may be readily opened without the necessity of releasing an interlock when the switch is in the off condition.

While the switch may be readily operated from off to on and vice versa in the absence of any padlocking, to be descr bed, so long as the cover of the enclosure is closed, it is desirable, for safety reasons to guard against the turning on of the switch while the cover is open, unless this is clearly intended to be done. For this purpose there is provided a handle interlock which prevents the turning of the handle from off to on position while the cover is open, unless an interlock is released. This function is also provided by the lever 22 in the following manner. Lever 22 has a downwardly bent end 22, which rests on the plate 19 and acts as a pivotal support for the lever 22.

Referring to FIGURE 3, it will be observed that the opening 25 permits some movement in the wider portion thereof of the lever 22 in a direction normal to its general plane. It has also been mentioned that the cornpression spring 30 exerts an upward force on the lever 22 pushing it against the upper surface of the slot 25. In normal operation, the lever 22 is held in a position adjacent the bot-tom edge of the opening 25 by means of the the surf-ace 33 of the catch 32 carried by the cover 11. Thus so long as the cover is closed, the lever 22 is held in a downward position. In this position, the stud 28 permits passage of a second projection 38 on the plate 19.

When the cover is opened (the switch normally being is off condition), the lever 22 is permitted to rise to the upper portion of the slot 25. In this condition, the end of the stud 28 projects into the path of movement of the projection 38, and when it is attempted to turn the switch handle to the on position, while the cover is open, the projection 38 strikes the stud 28 and prevents such movement.

If it is desired, nevertheless, to turn the switch to the on position while the door is open, this is possible by depressing the lever 22 manually while turning the handle. When this is done, the lever 22 moves into the narrower portion of the slot 25 where it is retained while the switch is in the on position. When the switch is again turned to the ofi position, however, the lever 22 slides off of the shoulder portion 26 and rises again to interlocking position.

It will be observed that the spacing between the projections 37 and 38, as compared to the spacing between the studs 27 and 28, is such that as the switch is moved toward off position, the projection 38 moves out from under the stud 28 before the projection 37 engages the stud 27, thereby insuring that the lever 22 will be free to move to interlock position when the cover is open.

Referring now to FIGURES 4 and 5 particularly, it will be observed that there is a critical relation between the height of the pin 28 and the position of the lever 22 as depressed by the cover. Thus it will be observed that once the lever 22 has been depressed enough to pass over the shoulder 26 of the opening 25, the stud 28 should be below the projection 38 of the plate 19. If this did not occur, it would not be possible to turn the switch to the on position even though the cover was closed and latched. If, on the other hand, the stud 28' were made sufficiently short to insure that it would always be below the projection 38 when the lever 22 is depressed to the level of the shoulder 26, there might be a possible position in which the lever 22 could be held by the door in which it would not be quite beyond the shoulder 26, and yet the upper end of the stud 28' would be below the projection 38. In such a situation, it would then be possible to turn the switch to the on position even though the cover were not latched closed. Either of these conditions is undesirable from a safety standpoint. At the same time, however, it is virtually impossible to manufacture enclosures in volume and to mount such devices within such enclosures with extremely accurate spacings provided.

In order to overcome this extremely critical situation, the stud 28 is modified in accordance with the invention as shown in FIGURE 5, in .which it will be observed that the upper end of the stud 28 is provided with a tapered portion 28a. With this construction, it is only necessary for the cover C to depress the lever 22 to a depth which is within the range in which the projection 38 will strike the stud 28 at some point on the tapered surface. When this is done, turning the switch toward the on position exerts a force on the projection 38 transmitted to the stud 28 which earns the stud 28 and the member 22 downwardly and forces it over the shoulder 26, insuring that it will move to the fully latched position.

It will also be observed that since the surface 33 of the catch 32 is the portion of the cover which strikes the lever 22, the lever 22 will be assured of moving into the slot 34 when it clears the shoulder 26. This would of course not necessarily be the case if some other projection on the cover were used to depress the lever 22.

Referring to FIGURE 6, the manually engageable handle assembly includes a manually engageable handle member which is generally rectangular in outline and has a pointed end and a blunt end. The handle 40 has a cylindrical boss 41, which rides in a sleeve portion 42 of a circular handle escutcheon member 43. The cylindrical boss 41 is connected to and supports the operating lever 18, to which it is connected by suitable means such as screws 44. An extra set of tapped mounting holes 45 is provided in the lever 18 to permit mounting of the handle 40 at any of four different relative positions with respect to the operating arm 18.

The escutcheon 43 comprises a circular rim portion and a base or floor portion 46. A series of holes 47a, 47b, 48 are provided at each mounting location (see FIG- URE 8). At each mounting location, one of the openings 47a affords access to the head 29 ofthe stud 23 to permit defeat of the interlock lever 22. The adjacent opening 47b afiords access to the head, not shown, of the stud 20 for assembly purposes. The adjacent opening 48 is tapped to receive a retaining screw, not shown, inserted upwardly from the pan 15 to positively retain the escutcheon 43 on the pan 15.

The handle 40 is provided with a slot extending inwardly from one end thereof, and a locking slide member 49 formed of flat sheet metal and having an elongated opening 50 therein for a purpose to be described, and a raised end projection 51, to facilitate manual operation of the slide. The locking slide 49 is frictionally retained for sliding movement in the handle 40 by means of a compression spring 52 which is trapped against movement in the handle 40 but which presses against a fixed retaining member 53 at one end and against the upper edge of the opening 50 at the other end. A retaining member 53 also acts as a stop to limit the outward movement of the slide 49. For the purpose of cooperating with the slide 49, a notch 54 is provided in the raised 'edge of the escutcheon 43, permitting the slide 49 to be drawn out when the handle is in the off position, as indicated in FIGURE 1, in which position one or more padlocks may have the hasp portion thereof inserted through the opening 50 thereof as indicated in FIGURE 1. In order to provide for optional locking of the handle when in the on position, a notch shaped portion of the edge of the escutcheon ring 43 is provided which is thinner and may be easily broken out to provide a second clearance notch for this position.

It will be observed that when the slide 49 is drawn out and looked as shown in FIGURE 1, the handle is locked in the particular position it occupies, and, since the slide at such time overlies a portion of the outer cover 11 of the enclosure, the enclosure is locked in the closed position simultaneously.

For the purpose of improving the appearance and for carrying a suitable on-ofi indication, an indicator plate 55 is provided which is trapped between the handle 40 and the escutcheon floor or base 46.

While the invention has been shown and described in only one embodiment, it will be readily appreciated that many modifications thereof may be made, .and it is therefore intended by the appended claims to cover all such modifications as fall within the true spirit and scope of the invention.

What we claim as new and desire to secure by Letters Patent of the United States is:

1. An electric switch comprising an enclosure having a generally planar top surface, a manually operable handle member pivotally mounted on said planar top surface on an axis of rotation generally perpendicular thereto, said manually operable handle being movable about said axis of rotation between spaced on and 01f positions, a

raised circular ridge surrounding said manually operable handle, said operating handle having a locking slide 6 slidably supported therein and movable therein to a position in which at least a portion of said locking slide projects outwardly from one end of said manually operable handle, at least a portion of said raised circular rim lying closely adjacent the path of movement of said end of said manually operable handle member, said raised circular rim having a notch cut therein at the position corresponding to the position of said slide when said handle is in said oif position whereby said slide may be drawn out of said handle when said handle is in said off position, and an opening in said locking slide to permit the insertion of a locking means said locking means preventing the movement of said locking slide fully within said operating handle and said locking slide preventing the movement of said handle away from said off position.

2. Enclosed electric control device comprising an electric switch, a manually operable handle mounted on said electric switch, an operating member connected to said operating handle for operating said electric switch, means for selectively connecting said operating handle to said operating member in any selected one of four desired positions each separated by degrees from the adjacent positions so that said electric switch may be mounted in any desired vertical or horizontal orientation while a predetermined indicating position of said handle remains unchanged, said operating handle comprising an elongated manually engageable member, a circular raised guard ring surrounding said manually operable handle, said guard ring including a base portion extending parallel to said top surface of said switch, at least four holes in said base portion of said guard ring, said switch including an interlock defeat screw lying within the area covered by said guard ring and accessible only through an opening in the base portion of said guard ring, whereby said release screw is accessible through one of said four openings regardless of the mounted relation of said handle on said operating member.

No references cited.

ROBERT K. SCHAEFER, Primary Examiner.

H. HOHAUSER, Assfstant Examiner.

Claims (1)

1. AN ELECTRIC SWITCH COMPRISING AN ENCLOSURE HAVING A GENERALLY PLANAR TOP SURFACE, A MANUALLY OPERABLE HANDLE MEMBER PIVOTALLY MOUNTED ON SAID PLANAR TOP SURFACE ON AN AXIS OF ROTATION GENERALLY PERPENDICULAR THERETO, SAID MANUALLY OPERABLE HANDLE BEING MOVABLE ABOUT SAID AXIS OF ROTATION BETWEEN SPACED "ON" AND "OFF" POSITIONS, A RAISED CIRCULAR RIDGE SURROUNDING SAID MANUALLY OPERABLE HANDLE, SAID OPERATING HANDLE HAVING A LOCKING SLIDE SLIDABLY SUPPORTED THEREIN AND MOVABLE THEREIN TO A POSITION IN WHICH AT LEAST A PORTION OF SAID LOCKING SLIDE PROJECTS OUTWARDLY FROM ONE END OF SAID MANUALLY OPERABLE HANDLE, AT LEAST A PORTION OF SAID RAISED CIRCULAR RIM LYING CLOSELY ADJACENT THE PATH OF MOVEMENT OF SAID END OF SAID MANUALLY OPERABLE HANDLE MEMBER, SAID RAISED CIRCULAR RIM HAVING A NOTCH CUT THERIN AT THE POSITION CORRESPONDING TO THE POSITION OF SAID SLIDE WHEN SAID HANDLE IS IN SAID "OFF" POSITION WHEREBY SAID SLIDE MAY BE DRAWN OUT OF SAID HANDLE WHEN SAID HANDLE IS IN SAID "OFF" POSITION, AND AN OPENING IN SAID LOCKING SLIDE TO PERMIT THE INSERTION OF A LOCKING MEANS SAID LOCKING MEANS PREVENTING THE MOVEMENT OF SAID LOCKING SLIDE FULLY WITHIN SAID OPERATING HANDLE AND SAID LOCKING SLIDE PREVENTING THE MOVEMENT OF SAID HANDLE AWAY FROM SAID "OFF" POSITION.

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