US3141947A - Front-operated switch with bail type handle - Google Patents

Description

21, 1954 D. F. DALY ETAL 3,141,947

FRQNT-QPERATED SWITCH WITH BAIL TYPE HANDLE Filed Dec. 4, 1959 3 Sheets-Sheet 1 INVENTORS. DANIEL F. DALY Roam-r 5. TILLSON ATTORNEY y 21, 1964 D. F- DALY ETAL 3,141,947

FRONT-OPERATED SWITCH WITH BAIL TYPE HANDLE 3 Sheets-Sheet 2 Filed Dec. 4. 1959 INVENTORS. DANIEL E DALY Rosam- S-TH-LSON July 21, 1964 D. F. DALY ETAL FRONT-OPERATED SWITCH WITH BAIL TYPE HANDLE Filed Dec. 4, 1959 NORMAL MOUNTING 3 Sheets-Sheet 3 REVERSED MOUNTING INVENTORS DANIEL F. DALY,

ROBE-RT $.Tn LLSON ATTORNEY United States Patent Our invention relates to enclosed electric switches, and

particularly to electric switches of the type including an electric switching device contained within a metallic enclosure and provided with mechanism for operating the switching device from outside of the enclosure.

According to the prior art, enclosed switches have ordinarily included an operating handle which is either (1) mounted on the front or cover of the enclosure on an axis perpendicular to the back of the enclosure to provide a front-operated type of enclosed switch, or (2) on the side wall of the enclosure on an axis parallel to the back of the enclosure to provide a side-operated type of enclosed switch. Side-operated types of switches have certain advantages in that the operating handle moves in a rectilinear fashion upwards and downwards and it is very easy to perceive the on or o condition of the switch even without reading the markings on the switch. Thus according to traditional practice, the upward position is normally on and the downward position is off. Sideoperated switches, however, have the disadvantage that they cannot be mounted closely adjacent each other, since room must be left for the operator to grasp the operating handle.

Front-operated switches, on the other hand, have the advantage that they can be mounted closely side-by-side, thereby conserving space. Since the handles of prior art front-operated switches are mounted on an axis perpendicular to the back wall of the enclosure, they must be operated by a rotary or twisting motion, rather than a vertical reciprocal motion. This makes such switches more difficult to operate, and also makes it more diflicult to detect the on or oil? condition of the switch.

In addition, prior art switches having a vertical reciprocating handle are so constructed that the on and o positions of the handle are predetermined and unchangeable. This requires that the switch be mounted in a particular orientation when in use in order that the on position will be upward and the off position downward. For ease in wiring the switch, however, it is sometimes desirable to mount the switch in an inverted position so that incoming wires may enter from the end of the enclosure which is closest to the line terminals of the interior switching device. This has not been possible with prior art switches since this would place the on position of the handle downward and the off position upward, which is not desirable for safety reasons.

The term switch or electric switch, as used herein, means any repetitively operable electric circuit making and breaking device whether or not such device includes means for automatically operating, and specifically includes switching devices known as circuit breakers.

It is an object of the present invention to provide an enclosed electric switch having a manually operable handle accessible for operation from the front of the switch, which does not require that the operators hand project beyond the side of the switch, and which is nevertheless operable in a vertically reciprocating manner.

t is another object of the invention to provide an enclosed electric switch which may be mounted in a first position or in a second position which is inverted end-forend with respect to the first position, and which includes a reciprocating type handle and means whereby the switch may be modified so that the on position of the handle may be at either extreme of its movement as desired,

whereby the switch may be mounted on a vertical wall, and the on position of the handle may always be upward, regardless of the upright or inverted condition of the entire switch.

It is another object of the invention to provide an enclosed electric switch including electric switching means contained within an enclosure and operating means carried by the enclosure, wherein the switching means may be readily removed from the enclosure without disturbing the manually operable means.

Another important object of the invention is to provide an enclosed switch having a snap-acting mechanism which has no dead-center condition, which is positive in operation (i.e., will operate the switch even though the overcenter spring is broken) and which will operate an insulating rotor without danger of breakage.

Additional objects will in part become obvious from the following detailed description, and in part be set forth therein.

In accordance with the invention in one form, an enclosed electric switch is provided including an enclosure, electric switching means within the enclosure having an operating member, and manually operable means carried by the cover of the enclosure and comprising a generally U-shaped bail type handle, pivotally supported upon the cover of the enclosure and operably interconnected with the interior switch operating member.

In accordance with one aspect of the invention, means is provided for maintaining the manually operable handle in either of its two extreme positions even when the cover is disengaged from the switch enclosure.

In accordance with another important aspect of the invention, the switch operating mechanism includes means which is selectively connectible in either of two conditions to provide a predetermined desired relation between a given position of the manually operable handle and the circuit open or closed condition of the switching means within the enclosure.

In accordance with a still further aspect of the invention, a snap acting mechanism is provided including a pair of rotatable operating members and a compression spring acting therebetween to bias the members to one side or the other of the line connecting their pivots, and a carn-and-roller interconnection between the two members. The relation of the biasing spring mounting to the cam-and-roller interconnection is such as to minimize the possibility of stalling the mechanism on a dead-center position.

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

In the drawings:

FIGURE 1 is a front elevation view of an electric switch incorporating the invention and shown as mounted on a vertical wall surface;

FIGURE 2 is a fragmentary view in perspective showing the portion of the operating mechanism carried by the enclosure cover;

FIGURE 3 is a front elevation view of the interior switch unit of FIGURE 1;

FIGURE 4 is a side elevation view partially in section taken generally on the line 44 of FIGURE 1, and showing particularly the snap-acting mechanism;

FIGURE 5 is an exploded perspective view of the portions of the mechanism shown in FIGURE 2;

FIGURE 6 is a side elevation view of a portion of the operating mechanism shown connected in a first condition;

FIGURE 7 is a view similar to FIGURE 6 and showing the parts connected in a second condition;

FIGURE 8 is a front elevation view of an electric switch in accordance with the invention shown mounted in a first or normal mounting position;

FIGURE 9 is a view similar to FIGURE 8 but showing the electric switch mounted in a second or reversed mounting position, inverted with respect to the first position and after modification of the operating mechanism to alter the on-off direction of the handle.

In the drawings, the invention is shown as embodied in an electric switch comprising a generally rectangular enclosure 10 having an openable cover 11 hinged thereto by suitable hinge means 12 and containing an electric switching device 13 (FIG. 3) having an operating rotor 14. The switching device 13 may be of any suitable type such as a conventional switch or circuit breaker. The particular switch means illustrated is similar to that shown in copending application Serial Number 857,384, filed December 4, 1959, and assigned to the same assignee as the present invention. Since the particular construction and operation of the electric switch is not critical to the present invention, it will be described only in general terms here.

The switch 13 includes an insulating base, line terminals 15, and load terminals 16. The line and load terminals are connected to pairs of spaced, relatively stationary contacts 17 and 18 respectively, which are adapted to be bridged and interconnected by contact blades 19 carried by the rotor 14, in one position of the rotor. Fuses 79 are inserted in series between the load terminals 16 and the stationary contacts 18. When the rotor is rotated through a predetermined angle, the bridging contacts 19 are moved out of engagement with the pairs of stationary contacts, and the circuit is interrupted between the line and load terminals.

For the purpose of operating the electric switch member 14 between its on and off positions, there is provided an operating mechanism including a snap-acting mechanism 20 mounted on the side wall of the enclosure 10, a manually operable handle 21, and intermediate operating mechanism 22 carried by the cover 11.

The Snap-Acting Mechanism Referring particularly to FIGURE 4, the snap-acting mechanism 20 carried by the side of the enclosure 10 includes a main supporting plate 23 which is attached to the side wall of the enclosure 10 by suitable means such as by rivets 24. A first operating plate 25 is pivotally supported on the plate 23 by pivot pin 26 and has a pair of upwardly bent projections 27 for the purpose of receiving an operating member carried by a cover mechanism in a manner to be described. The plate 25 also includes a pair of spaced projections 28a and 28b, adapted to coact with the stop projection 29 carried by the supporting plate 23 to limit the angular movement of the plate 25 about the pin 26. An operating hub 30 is likewise pivotally supported on the plate 23 by means of a pivot pin 31. The operating hub 30 has an irregularly shaped recess 32 in the outer surface thereof for the purpose of receiving the laterally projecting end of the actuating member or rotor 14 of the switching means. The end of the switch rotor 14 is preferably made nonsymmetrical so as to be receivable in the recess 32 in only one position. An elongated flat leaf spring 33 is mounted on the hub 30, being retained thereon by being trapped between the shoulders 34 and the projection 35. The leaf spring 33 serves to resiliently retain the operating member 14 normally in predetermined relation position within the recess 32, while permitting a small amount of lost-motion during operation. The hub 30 also includes a projecting pin 36 having a roller 37 supported thereon and received within a generally circular recess 38 in the operating plate 25. .The edge portions of the plate 25 adjacent the recess 38 are adapted to act as cam means upon the roller 37 to cause movement of the hub 30 upon rotational movement of the operating 4 plate 25. The relation of the cam surface 38 to the roller 37, however, is such that a lost motion is provided between the two pieces 25 and 30.

A compression spring 39 is provided having one end seated in a generally cup-shaped retaining member 40a mounted on an upwardly bent projection 41 of the plate 25. The opposite end of the spring 39 is seated in a cup-shaped retaining member 40b having an opening in the bottom wall thereof guided on a spherical retaining member 43 comprising an integral portion of the hub member 30, and adapted to rock about the apex of an adjacent generally V-shaped projection of the hub 30.

In operation, referring to FIGURE 4, as the plate 25 is moved counterclockwise about its supporting pivot pin 26, the cam surface 38 engages the roller 37 and moves the hub member 30 clockwise about its supporting pivot pin 31. As the motion of these two parts proceeds, the compression spring 39 is compressed and at a predetermined point in the movement, the line of action of the spring passes from one side to the other of the center line of the pivot pin 26 and the pivot pin 31, and the mechanism snaps further in the same direction.

The arrangement of the cam-and-roller interconnection is so related to the mounting of the spring 39 that when one end of the spring 39 is in line with the center-line of the members 25 and 31 the other end is out of such line.

In addition the spring 39 is preferably of such length that it assumes a slightly S-shaped condition at each extreme of movement. Thus as the overcenter point of the mechanism is approached, the spring itself has an overcenter action as the cup 43b rocks about the apex 89 of the hub 30.

These structural characteristics of the snap-acting mechanism make it virtually impossible to stall the mechanism in a dead-center position. In addition, if the compression spring 39 were to fail such as by breaking, the camand-roller interconnection provides a means for positively operating the switch.

The rotational movement of the hub 30 is limited in each direction by the projections 44 and 45, bent up from the plate 23.

The switch unit 13 may be readily separated from the snap-acting mechanism 20 and removed from the enclosure 10 by removing the mounting screw 46 and sliding the switch unit along the back wall of the enclosure away from the hub member 30, to withdraw the end of the operating member 14 from the recess 32.

The Handle Mechanism For the purpose of operating the snap-acting mechanism, a handle mechanism is provided, including a manually operable handle member 21 which is generally U- shaped and which has one end thereof, 48, bent inwardly and journalled in a drawn opening in the side portion of the dome or bump 49 of the cover 11. The opposite end 50 of the handle is pivotally supported upon a pivot pin 51 which is carried by a generally L-shaped bracket 52 attached to the cover 11 by shouldered rivets 53. A second generally L-shaped member 54 is slidably supported on top of the bracket 52 under the heads of the rivets 53. The second bracket 54 has a pair of elongated slots 55 through which the rivets 53 project. Thus the bracket 52 is fixedly mounted on the cover, while the bracket 54 is slidable by the amount permitted by the slots 55. In addition, both the brackets 52 and 54 have openings therein, not shown, in the upstanding portions thereof, which are adapted to register when the bracket 54 is slid forwardly to a first position. The cover 11 also has an elongated slot 56 positioned just forwardly of the bracket 54 adapted to receive a generally hook-shaped catch 57 which is pivotally supported on the side wall of the enclosure 10 and which includes a portion which is adapted to overlie the top surface of the cover 11 when the cover is in its fully closed position. The catch 57 may normally be retracted by pivoting about its pivot pin to permit opening of the cover. When the bracket 54 is slid to a forward position, however, and locked in this position, such as by passing a padlock through the registering openings in the two brackets, it interferes with the retracting movement of the catch 57 and thereby prevents opening of the cover.

The inwardly bent end of 48 of the handle 21 has a non-circular cross-section and is fitted into a corresponding opening in an operating link or crank-arm 58, see FIG. 5. The link 58 has a cam pin 59 rigidly attached thereto, and a cam roller 59' is supported on the pin 59 and retained thereon by the enlarged head 60.

An intermediate operating plate 61 is slidably supported on the inner surface 11a of the cover 11 by means of enlarged shouldered rivets 62, see FIG. 2, extending through elongated slots 63 in the plate 61. The plate 61 also has an upwardly bent operating tongue or projection 64 which is adapted to extend between the projections 27 of the operating member 25 of the snap-acting mechanism to cause operation of the member 25 upon operation of the plate 61.

An interlock catch 65 is pivotally supported upon a pin 66 mounted on the cover 11, and is biased by a tension spring 67 constantly in a counterclockwise direction as viewed in FIG. 2. The interlock catch 65 includes a generally hook-shaped portion 69 which is adapted to interengage with a stationary bracket 70 rigidly mounted on the side wall of the enclosure when the interlock member 65 is in its farthest counterclockwise direction of movement as viewed in FIGURE 2. When the slide member 61 is moved to one extreme of its movement, however, it engages the interlock catch 65 and rotates it out of interlocking engagement. On the other hand, when the slide 61 moves away from the interlock member 65 to its opposite extreme of movement, corresponding to the on position, it is permitted to move to its farthest counterclockwise direction and into interlocking engagement. This serves normally to prevent opening of the switch cover when the switch parts are in the on condition. The operating plate 61 includes a portion bent upwardly at substantially 90 degrees with respect to the first portion and including an elongated slot 71 for the purpose of receiving the cam roller 59' carried by the cam pin 59.

For the purpose of providing a desired biasing action on the handle 21, a supplementary link 72 is provided which is pivotally supported in the upstanding portion of the plate 61 in a generally V-shaped notch 73. The link 72 has an elongated slot 74 therein, through which the cam pin 59 also passes: The link 72 is biased for rotation about its pivot point by an elongated tension spring 76 which is anchored to the cover 11 by the hook 77 at one end and which has its other end engaged in an aperture 75 in the upwardly bent end of link 72.

In operation, rotation of the handle member 21 about the pivotal axis formed by the bearing of the portion 48 in the cover 11 and the bearing of the end 50 on the pin 51, causes rotation of the link 58 about the bearing point of the inturned handle end 48. This causes movement of the cam roller 59 in an arc and the roller 59' in turn acts upon the sides of the slot 71 to move the operating plate 61 in rectilinear fashion along the inner surface of the cover. This sliding movement of the plate 61 causes movement of the operating plate of the snap-acting mechanism to operate the switch.

At both extremes of movement of the manually operable handle 21, the link 72 is biased in a clockwise direction about its pivot point 73 as viewed in FIGURE 4. It will be observed that the result of this is to cause the link 72 to exert a force on the cam roller 59' and the cam pin 59 which is directed generally upwardly as viewed, i.e., toward inner surface 11a of the cover 11. Since the cam pin 59 is carried by the link 58, the link 58 is also urged toward the inner surface 11a of the cover 11, and

the outer portion of the handle 12 is urged toward the outer surface 11b of the cover 11. It will also be observed that the result of such an upwardly directed force on the cam roller 59' in each extreme of its positions is such as to retain the handle in its then existing extreme position. This is important, since it is desirable that the handle retain itself in the position it occupies when the cover of the switch is opened so that the parts will register again when the switch cover is closed.

Reversibility of Mechanism Referring now particularly to FIGURES 6 and 7, FIG- URE 6 shows certain portions of the mechanism connected in the relation similar to that shown in FIGURES 1-5, in which the link 58 projects beyond the end of the handle 21. As previously described, rotation of the bandle 21 beween extreme arcuate positions causes movement of the slide 61 between corresponding rectilinearly displaced positions. For the purpose of reversing the relation between the extreme positions of the handle 21 and the extreme positions of the slide member 61, the mechanism is so constructed that the link 58 may be removed and reassembled on the handle 21 in a position which is degrees reversed, as shown in FIGURE 7. When the parts are assembled in this manner, it will be observed that the relationship of the positions of the slide member 61 and the positions of the handle has been reversed. In other words, although the handle 21 is in the same position, in both FIGURES 6 and 7, the position of the slide 61 has changed from the on position to the off position.

By this means it is possible to mount the switch of the present invention in either of twopositions when mounted on a wall and still provide that the operating handle shall be in the upper position when the switch is on and in the lower position when the switch is otf. This is illustrated in FIGURES 8 and 9. FIGURE 8 illustrates a common method of mounting such a switch, in which the electric power or line enters the switch at the top and the handle movement is upwardly to on position and downwardly to off position. In FIGURE 9, there is shown an application where the power feed line enters from below the switch but the handle movement is still in the same direction. In changing from the installation of FIGURE 8 to the installation of FIGURE 9, the entire switch is inverted 180 degrees and is mounted upside down with respect to the position in FIGURE 8. The only changes made in the switch are the reversal of the nameplate which carries the on-otf designation, and the change in linkage described above.

The ability to mount the switch in an inverted position is important because the line terminals are usually desired to be closest to the point of entry of the line wiring to prevent the necessity of having to bring the line wires through the entire box to the opposite end and the load Wires likewise through the box to the opposite end.

Since many modifications of the invention will readily occur to those skilled in the art, it is 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 enclosed electric switch comprising a generally rectangular box-like body having a back wall and upstanding side and end walls and an open top wall, an electric switch unit mounted in said box body on said back wall and including an operating member movable between on and off positions, an openable cover mounted on said box body and closing said top wall, said cover having a generally planar peripheral portion and a generally central outwardly deformed enlargement or bump providing a chamber on said communicating with the interior of said box body, a manually operable handle member comprising a generally U-shaped member having its ends pivotally supported on said cover on an axis extending parallel to the plane of said peripheral portions,

said handle including a manualiy engageable bight portion parallel to said axis, said manually engageable portion being entriely within the space defined by the planes of said side Walls extended, an intermediate operating member slidably supported on the inner surface of said peripheral planar portion of said cover and including a portion projecting into said cover chamber, an elongated aperture in said portion of said intermediate member, means connected to one end of said handle and extending into said aperture for causing reciprocating sliding motion of said intermediate operating member upon pivotal movement of said handle member about said axis, said intermediate operating member also including an extension projecting into said box body chamber and having a releasable engagement with said operating member of said switch unit.

2. An enclosed electric switch comprising a generally box-like enclosure having an open top wall, an openable cover supported on said enclosure and closing said top wall, an electric switch mounted in said enclosure and including an operating member movable between on and off positions, an operating handle rotatably carried by said cover and including a portion accessible for manual operation externally of said switch when said cover is closed, an intermediate operating member movably supported on the inner surface of said cover and having a releasable connection with said operating member of said switch unit, said intermediate operating member having an elongated slot therein, said operating handle including an extension extending through said cover, an operating link rigidly carried by said extension inside said cover and including a cam projection spaced from the axis of rotation of said handle and extending into said slot of said intermediate member to cause movement of said intermediate member so as to move said operating member of said switch unit between on and olf positions upon movement of said operating handle, means for mounting said operating link selectively in first and second mounting positions displaced 180 degrees with respect to each other on said shaft said cam projection being engageable in said slot when said link is in each of said positions, whereby reversal of the mounting position of said link causes reversal of the operating relation of the manually operable handle member to the operating member of the contained switch.

3. An enclosed electric switch comprising a generally box like body having an open top wall, an openable cover supported on said box body and closing said top wall, an electric switch unit mounted in said box body and including an operating member movable between on and off positions, an operating handle pivotally supported on said cover, an intermediate operating member within said enclosure operably connected to said switch unit operating member, said intermediate operating member having an elongated slot therein, operating means including a member interconnecting said operating handle and said intermediate operating member, said operating means including a cam projection receivable in said slot of said intermediate operating member, said operating means being selectively mountable in first and second positions displaced 180 degrees with respect to each other about the axis of rotation of said operating handle with said cam projection engageable in said slot in each of said positions, whereby reversal of the mounted position of said operating means causes reversal of the operating relation of the operating handle to the operating member of the said switch unit.

4. An electric switch comprising a generally rectangu- 8 lar enclosure having a back wall and upstanding side and end walls and an opentop wall, an openable cover mounted on said box body and normally closing said open top Wall, an electric switch unit contained within said enclosure and including an operating member movable between open and closed circuit positions, a manually operable handle member pivotally supported on said cover and comprising a generally U-shaped member having its ends pivotally supported on a common axis parallel to said top Wall, an intermediate operating member slidably mounted on the inner surface of said cover, means releasably interconnecting said intermediate operating member with said operating member of said switch unit, said manually operable handle including an operating shaft portion extending within said enclosure parallel to said top wall, a crank arm rigidly connected to said operating shaft within said enclosure, an elongated aperture in said intermediate operating member, a cam roller carried by said crank arm eccentric of said operating shaft and extending into said elongated aperture in said intermediate operating member to produce reciprocating sliding movement of said intermediate operating member upon rotational movement of said manually operable member, and biasing means for retaining said manually operable handle member in each of its two extreme positions when said cover is open, said biasing means comprising an elongated link pivotally supported on said intermediate operating member and biasing means tending to urge said link for rotation about its pivotal support toward the inner surface of said cover and into engagement with said cam member whereby to urge said cam member toward the inner surface of said cover and to urge the outer portion of said handle toward the outer surface of said cover, when said handle is in each of its two extreme positions.

5. An electric switch comprising an insulating base, at least one pair of relatively movable contacts supported on said base, a contact operating member supported on said base and movable to move said movable contacts between open and closed circuit positions, means for operating said operating member comprising a support, a first operating link pivotally supported on said support, a second operating link pivotally supported on said support on a pivot spaced from said pivot of said first link and operatively connected to said contact operating member, a

' cam-and-follower interconnection between said first and second links, a compression spring between said first and second links and disposed and arranged to shift its line of action from one side to the other of the center line of said pivots of said first and second links, said compression spring extending between a point eccentric of said first link and a point eccentric of said second link, said points of connection of said spring being positioned so that when one of said points is on said center line, the other of said points is disposed to one side of said center line. 7

References Cited in the file of this patent UNITED STATES PATENTS 1,460,542 Griswold July 3, 1923 2,237,530 Olley Apr. 8, 1941 2,646,488 Platz July 21, 1953 2,771,523 Stoecklin et al Nov. 20, 1956 2,917,593 Groves et al. Dec. 15, 1959 FOREIGN PATENTS 162,356 Sweden Mar, 4, 1958

Claims (1)

1. AN ENCLOSED ELECTRIC SWITCH COMPRISING A GENERALLY RECTANGULAR BOX-LIKE BODY HAVING A BACK WALL AND UPSTANDING SIDE AND END WALLS AND AN OPEN TOP WALL, IN ELECTRIC SWITCH UNIT MOUNTED IN SAID BOX BODY ON SAID BACK WALL AND INCLUDING AN OPERATING MEMBER MOVABLE BETWEEN "ON" AND "OFF" POSITIONS, AN OPENABLE COVER MOUNTED ON SAID BOX BODY AND CLOSING SAID TOP WALL, SAID COVER HAVING A GENERALLY PLANAR PERIPHERAL PORTION AND A GENERALLY CENTRAL OUTWARDLY DEFORMED ENLARGEMENT OR BUMP PROVIDING A CHAMBER ON SAID COMMUNICATING WITH THE INTERIOR OF SAID BOX BODY, A MANUALLY OPERABLE HANDLE MEMBER COMPRISING A GENERALLY U-SHAPED MEMBER HAVING ITS END PIVOTALLY SUPPORTED ON SAID COVER ON AN AXIS EXTENDING PARALLEL TO THE PLANE OF SAID PERIPHERAL PORTIONS, SAID HANDLE INCLUDING A MANUALLY ENGAGEABLE BIGHT PORTION PARALLEL OF SAID AXIS, SAID MANUALLY ENGAGEABLE PORTION BEING ENTRIELY WITHIN THE SPACE DEFINED BY THE PLANES OF SAID SIDE WALLS EXTENDED, AN INTERMEDIATE OPERATING MEMBER SLIDABLY SUPPORTED ON THE INNER SURFACE OF SAID PERIPHERAL PLANAR PORTION OF SAID COVER AND INCLUDING A PORTION PROJECTING INTO SAID COVER CHAMBER, AN ELONGATED APERTURE IN SAID PORTION OF SAID INTERMEDIATE MEMBER, MEANS CONNECTED TO ONE END OF SAID HANDLE AND EXTENDING INTO SAID APERTURE FOR CAUSING RECIPROCATING SLIDING MOTION OF SAID INTERMEDIATE OPERATING MEMBER UPON PIVOTAL MOVEMENT OF SAID HANDLE MEMBER ABOUT SAID AXIS SAID INTERMEDIATE OPERATING MEMBER ALSO INCLUDING AN EXTENSION PROJECTING INTO SAID BOX BODY CHAMBER AND HAVING A RELEASABLE ENGAGEMENT WITH SAID OPERATING MEMBER OF SAID SWITCH UNIT.

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