Патент USA US2405923код для вставки
Aug. 13, 1946. E. G. HENRY MERCURY SWITCH RELAY Filed Nov. 18, 1942 2,405,923 Patented Aug. 13, 1946 2,405,923 UNITED STATES PATENT OFFICE 2,405,923 MERCURY SWITCH RELAY Earle G. Henry, Wilmette, Ill., assignor to Buckley Music System, 'Inc., a corporation of Illinois Application November 18, 1942, Serial No. 465,989 2 Claims. (01. 200—112) 1 2 The present invention relates to relays in which of the pan, to provide three-point bearing against one or more mercury switches are oscillated to a wall to which the base may be fastened with its open side toward the wall. A pair of horizon tal arms 3 are ?xed to opposite sides of the base make and break circuits, upon the energization and de-energization of an operating electric mag net. Any conventional electromagnet, if power ful enough to do its work at all, tends to act suddenly. Consequently, such an electromagnet and project forwardly therefrom. Between these arms or brackets is mounted a cradle that is adapted to rock about a horizontal aXis parallel serving as an actuator for an oscillatory mer with the front face of the base in opposite direc cury switch, produces a correspondingly rapid tions from a horizontal plane. The cradle may swinging movement of the switch; the result be 10 conveniently be formed of a ?at piece of sheet metal that is square or retcangular and is pro ing that the mercury is caused to oscillate rela tively to its container and thus repeatedly open vided at its four edges with ?anges or wings; and close the circuit which it was intended either those at the sides being indicated at 5 and those at the front and rear at 6 and l. The side ?anges to open or to close. The primary object of the present invention is 15. and the rear ?ange are bent upwardly whereas the front flange is bent downwardly. A little to produce a simple and novel construction which trunnion 8 projects outwardly from each of the will overcome the fault just mentioned and insure side ?anges and through an opening in the adja that a circuit will be opened or closed positively upon the operation of an oscillatory mercury cent supporting bracket or arm 3. Fastened to switch. 20 the bottom of the cradle, toward opposite sides, My invention has for a further object to sim are a pair of stiff arms 9. Another stiff arm H3, 'plify the construction of mercury switch relays lying flat against the under side of the cradle, is fastened thereto and projects rearwardly through and make them sturdy and durable as well as effective and efficient in operation. a window H in the front wall of the base. The A further object of the present invention is to rear end of the arm or stem Ill may be bent up provide simple and novel means for holding cap wardly, within the base, as indicated at l2}. sule-like mercury switches in a relay structure - Resting loosely on the part I2 is a fairly massive or the like, so that they may be easily removed weight 24 held in the pan by a pair of vertical and replaced and be adapted to be turned end for guides l5 which leave the weight freedom of up end and be accurately located and securely held . and down movements. Projecting forwardly from the longitudinal when inserted in the relay structure. The various features of novelty whereby my center of the base, below the cradle, is a heavy bar or plunger I6 of magnetic material; connec invention is characterized will hereinafter be pointed out with particularity in the claims; but. for a full understanding of my invention and of its objects and advantages, reference may be had to the following detailed description taken in tion with the base being a hinge that permits t, swinging movements in a vertical plane, pref erably through a limited angle only. In the ar rangements shown, the front wall of the base is provided with a hole through which the short flange of an L-shaped plate I‘! projects; the wherein: Figure 1 is a top plan view of a relay embody 49 long ?ange or arm of the plate lying against and being welded to the rear side of this wall. ing the present invention; Fig. 2 is a section on line 2—2 of Fig. l, the counter-balancing weight The rear end of the member !6 is slotted to re ceive the forwardly projecting ?ange and is se being shown in elevation; Fig. 3 is a front view of the device, a fragment of the retaining plate cured to the latter by a hinge pin l8. It will be for the switches being broken away; Fig. 4 is a ;, seen that the rear end of the member l6 extends quite close to the long arm of the supporting rear view of the device; Fig. 5 is a section through the cradle and one of the switches at the longi plate I‘! which, therefore, serves as a stop to lim it swinging movements in both directions. tudinal axis of the switch; and Fig. 6 is a sec Cooperating with the member IE is a massive tion on line B—6 of Fig. 2, showing only a frag- I electromagnet l9 surrounded by a heavy iron ment of the cradle and one of the switches. shell 20. The electromagnet has a central bore Referring to the drawing, I represents a base in which the member i6 is a good sliding ?t, which is conveniently in the form of a shallow. this member forming an armature or plunger sheet metal, rectangular pan. Within the pan device for the electromagnet. There is the are three feet 2 distributed in the form of a triangle and somewhat longer than the depth # ‘usual plug 2| of electromagnetic material ?xed connection with the accompanying drawing, 2,405,923 4 3 ible cords 33, containing the conductors that are in the forward end of the bore in the electro magnet, and this plug may be caused to strike against the forward end of the plunger member to limit the rearward travel of the electromag connected to the switches, are carried from one side of the rod 3i and underneath the same to the switch terminals, so as to insure against the creation of sharp bends in the cords when net and thus serve as the actual stop for this the cradle is rocked. purpose. The electromagnet is connected to the When a mercury switch is rocked suddenly arms 9 by means of short pins or trunnions 22 from one position to another, there is a surging fixed to the shell of the electromagnet and ex of the mercury back and forth before a stable tending through holes in the lower ends of the arms. Consequently when the electromagnet is 10 condition is reached. By my improved con struction, I prevent this sudden shifting of the energized and moved toward the base it rocks the switches which the powerful electromagnets tend cradle and lifts the weight M. Then, upon de to cause. This improved action results from energizing the electromagnet, the weight M re the inertia of the masses that must be moved. stores the parts to the positions illustrated in Fig. 2. 15 The cradle serves to support any desired num ber of mercury switches of the type that are adapted to open and close by means of such rocking movements as can be provided by the cradle. To this end the cradle is equipped with holders for as many switches as are needed. In order to permit all of the switches to be simul Part of the inertia is provided by the weight it, which I use in lieu of the usual springs, but the greater part is afforded by the electromagnet itself which is purposely made massive. As a result of this construction, the elect-romagnet starts slowly when energized and, when deener gized, likewise aids in producing a slowly start ing return movement. ' I have also found that the position of the rock taneously opened or closed or to permit some of ing relative to the body of mercury, affects them to open at the time that others are clos ing, I so construct the holders that any switch 25 the tendency to surge on the part of the mer cury and that the least amount of surging oc may be turned end for end so that the same curs when this axis is in the vicinity of the cen rocking movement of the cradle may serve both ter of gravity of the movable body of mercury. to open and to close the same switch, depending In the particular switch illustrated, the inner upon which end is forward which end is toward the rear. 30 shell as of the capsule is metal and forms one electrode, while the other electrode 35 is a but The switches illustrated are of the capsule ton or disk at the longitudinal center of the type indicated as a whole at 2'5, one end of each switch within the large end of the capsule and nearer to the inner end than to the outer end of shaped clips 25, of resilient sheet metal, secured 35 the enlarged part of the capsule. It will be seen that the axis of the trunnions 8 of the cradle, in alignment with each other, one behind and upon which it rocks, is about midway between one in front of the axis about which the cradle the ends of the capsule and intersects the longi rocks. Each clip is secured to the cradle by two rivets 25 along the longitudinal center line; the tudinal axis of the latter. Therefore, in this heads of the rivets projecting up into the clips 40 particular form of switch, the shifting body 323 of mercury lies wholly on one side of the rock- I to form bearings which are engaged by the un ing axis of the cradle when the switch is open der side of the large end of a capsule as shown as in 5; and when the switch is rocked in in “'g. 5. Each clip has in one of the sides ad jacent to the top, and midway between the ends, the counter~clockwise direction, so ‘as to bring a rounded inward projection 2'5 that bears upon 45 the mercury into the other end of the switch, the center of gravity of the movable body of mer the large end of the capsule, somewhere in the cury is approximately at the axis about which upper half of the latter. By this means the large end of the capsule is provided with a three the oracle rocks. It is immaterial whether the switch is positioned in the cradle as in Fig. 5 or point hearing which accurately aligns it. Al though the small end of the capsule extends is turned end for end, because the cradle rocks through equal angles above and below a horizon through a clip, it has no bearing in the same as long as it is properly held by its large end. tal position; and, as a result, if the switch in Upon turning a switch end for end the clip Fig, 5 were turned end for end, the movable body of mercury would be in the same position with which was previously idle becomes the active respect to the rocking axis, when the switch is one. closed, as it is with the disposition of parts il It will be seen that the cradle is so propor lustrated in Fig. 5. The limits of the rocking tioned that the rear ends of the switches may movements are always the same, the rocking engage with the rear ?ange 'a', while the front ends may be engaged by a retaining plate 28 lying movement in one direction always ceasing when flat against and secured to the ?ange 5 at the the armor tail piece it strikes the edge of the bot front end of the cradle. The plate 28 may con tom of the window ii, whereas the cradle can veniently be held in place by screws 23 extending swing in the opposite direction only until the through vertically elongated slots 33 into the plug 25 strikes the end of the plunger l6. It will thus be seen that I have produced a flange 5. Theslots are made long enough so that, upon loosening the screws, the retaining simple novel mercury switch electromag plate may be dropped down clear of the switches, netic relay to insure that a circuit once closed,v without completely detaching the plate from the remains closed until the relay is operated for cradle. the purpose of closing the same, thereby pre venting chattering or repeated opening and clos The side walls or ?anges of the cradle are carried a considerable distance above the tops ing of a switch due to undesirable movements of of the switches so as to provide room above the the mercury; that switches may easily be re switches for a rod til extending transversely moved replaced; and that any switch in a across the cradle and supported at its ends by group thereof may easily be turned end for end these sides or ?anges. The rod is preferably to cause it to close when the others open. sheathed with insulating material 32. The flex While I have illustrated and described with capsule or casing being smaller in diameter than the other end. Each holder consists of two U 5 2,405,923 particularity only a single preferred form of my invention, I do not desire to be limited to the exact structural details thus illustrated and de scribed; but intend to cover all forms and ar rangements which come within the de?nitions of terial hinged at one end to the base and ex‘ tending at the other end into the solenoid tov cause the solenoid to be drawn toward the base and the cradle to be rocked in the direction op posite to the aforesaid direction when the sole noid is energized, the hinge axes of the solenoid I claim: and core being so disposed that the solenoid and 1. In an electromagnetic switch device, an up core remain coaxial during shifting movements right base, a cradle for a mercury switch mount of the solenoid along the core. ed on the front side of the base for rocking 10 2. A device as set forth in claim 1, wherein movements above a horizontal axis parallel to the hinge axis of the solenoid is parallel to the the base, a weight cooperating with the cradle to ‘axis about which the cradle rocks and passes swing it in one direction, a solenoid below and through the center of gravity of the solenoid. hinged to the cradle, and a core of magnetic ma EARLE G. HENRY. my invention constituting the appended claims.