Патент USA US2407572код для вставки
Sept. 10, 1946. > M_ F_ MlLLER INTERMITTENT SWITCH Filed June' 16, 1944 \\ 2,407,571 2,407,57l Patented Sept. 10, 1946 UNITED STATES- PATENT OFFICE _ 2,407,571 INTERMITTENT SWITCH Milo F. Miller, Kansas city, M0. Application June 16, 1944, Serial No. 540,586 6 Claims. (Cl. 20D-33) 1 . filed January l0, 1944, in that the periodic switch rI‘his invention relates to electrical apparatus in the nature of intermittent switches employed disclosed therein, may be made as hereinafter in circuits where it is desired to periodically close a circuit to operate electrical apparatus, and the primary aim is to provide such a switch wherein the essential element constitutes a volume of con set forth. 5 ducting liquid, the surface whereof is raised and lowered in properly timed relation with respect to the appearance of a movable brush upon each of a series of contact plates. Another important object of this invention is to provide an intermittent switch for electrical circuits having means for insuring that the clos ing and opening of the'circuit will occur only while a movable brush is passing across the faces of each of a number of short contact plates, said means including a specially formed, rotatable . The switch about to be described may be used in the electrical system set down in my said co-pending application, and therefore, it will be understood that the circuit diagrammatically il lustrated in Fig. 2, may be of any character so long as the switch assembly is disposed therein to periodically supply a number of electrical appliances Iii, I2, I4 and I6 with operating cur rent. , . _ The source of electrical supply, in the instance illustrated, is a conventional battery I8 and a conductor 2% .extends from this battery to the elongated, stationary contact memberv 24, sup ported in a casing of insulating material 26. Opposed to this elongated contact member 24, are hollow element having current conducting liquid a. number of relatively short Contact plates Z3, therein, the surface whereof is raised and lowered Sù, 32 and 34, each connected to their respective to and from engagement with a part of the rotat 20 appliances Iii, I2, I4 and IG by conductors form able element as the brush reaches and leaves each ing a part of the circuit. Other conductors join` of the several contact plates. appliances Iû, I2, I4 and IS with battery i8 and Intermittent switches usually embody rela connection thereto may be as illustrated, or other~ tively expensive and complicated parts where ` wise, to supply the proper voltage as the situation arcing is effectively overcome. Switches of this type may be made to present a rugged structure which positively functions if the shiftable assem bly thereof includes a properly contoured, hollow contact member timed ‘as hereinafter set forth, so that no current will be present until the brush of the movable assembly is actually resting upon one of a series of contact plates. It is, therefore, the main object of this invention to provide a simple, inexpensive and efficient intermittent switch that embodies a volume of current con ducting liquid, the level whereof may be raised and lowered in a predetermined manner.v - demands. , , Referring now to the intermittent switch and the preferred manner of constructing the same, elongated contact member 24 is preferably in the form of a rack having teeth 35 formed thereon, which mesh with teeth 38 on a hollow, rotatable element 40, which is formed of conducting mate rial as is Contact member 24. Element 40 is hollow and the interior thereof , is provided with a number of pockets 42, radially arranged and disposed to raise and lower the level of liquid 44 therein. This liquid may be any substance capable of flowing rapidly into pockets Minor objects o-f the invention will appear dur 42 as element 40 is rotated. ing the course of the. following specification, A part 46 in the form of a shaft extends axially referring to the accompanying drawing wherein: 40 through element 4U and into engagement with Fig. 1 is a top plan view of an intermittent yoke 48, bifurcated as illustrated in Fig. 3, and switch made in accordance with the present in continuing into a barrel 5i) having brush 52 slid vention. . ably mounted therein. Spring 54 bears upon the Fig. 2`is a vertical longitudinal centra-l sec inner end of brush 52 and yieldably maintains tional view through the switch taken on line 45 its outer end against the inner surface of one II-II of Fig. 1. wall of case 2li or against contact plates 28, 3Q, Fig. 3 is a transverse sectional view through 32 or 34, as the case may be. The sides of element the switch taken on line ïIï-lII-of Fig. 2 and 4f) areformed of non-conducting material and looking in the'direction of the arrows; and are in the nature of removable plates 5E, through 50 Fig. 4 is a fragmentary sectional View of the which part 45 passes, as shown in Fig. 3. hollow, rotatable element per se, entirely removed An operating rod 58 is in connection with the from association with the remaining parts of parts just described, through the medium of a the switch. holder 6I) formed of non-conducting material and This application is a continuation in part of when the level of liquid 44 rises to a point where my co-pending application, Serial No. 517,626, 55 3 2,407,571 it is against part 46, current may flow from con to the brush to close and open the switch while the brush is on each of the relatively short con tact member 36 through element 40, liquid 44, part 46, yoke and barrel 43 and 50 respectively, and brush 52 to plate 28, if the parts of the tact plates. 2. In an intermittent switch of the kind de scribed, an elongated stationary contact mem ber; a series of relatively short contact plates; a be so numbered and arranged as to cause the brush movable across the faces of the said con level of liquid 44 to engage part 46 only immedi tact plates; a hollow rotatable element of con ately after brush 52 has reached the surface of one of the contact plates 28, 30, 32 or 34. Like~ lO ducting material in constant contact with the elongated contact member having an axially dis wise, as the entire assembly, controlled by rod posed part of conducting material in connection 58, is moved in the direction of the arrow, the with the said brush and insulated from the ro level of liquid 44 should drop away from part 46 tatable element; and current conducting liquid immediately before brush 52 leaves any one of Iin the hollow element and in contact therewith, these several contact points. In so doing, the said element being formed to cause the level of brush and contact plates will be spared the detri the liquid to shift to and from a point against mental efi‘ect of arcing and clean surfaces may the said part while the brush is on each of the always be maintained in the switch. switch are in the position shown in Fig. 2. CR In constructing element 40, pockets 42 should The form of element 40 and member 24 is such that no slipping can occur between the areas thereof that are in contact, and therefore, when the switch is timed with regard to the level of liquid 44 and the disposition of pockets 42, the circuit will always be closed at the proper instant while brush 52 is upon one of the contact plates. The specific form of pockets 42 may be altered as desired and to suit conditions. Mercury has been found satisfactory as a liquid current con~ ducting medium, and also as a liquid which will quickly leave part 46 as element 40 is rotated. As illustrated in Figs. 2 and 4, the level of the liquid 44 when three pockets 42 are receiving the volume thereof, is high enough to contact part 46, but when parts of more than three pockets are below the level drop, as illustrated and therefore, open may be introduced relatively short contact plates. 3. In an intermittent switch of the kind de scribed, an elongated stationary contact mem ber; a series of relatively short contact plates; a brush movable across the faces of the said con tact plates; a hollow rotatable element of con ducting material in constant contact with the elongated contact member having an axially disposed part of conducting material in connec tion with the said brush and insulated from the rotatable element; and current conducting liquid in the hollow element and in contact therewith, said element being formed to cause the level of the liquid to shift to and from a .point against the said part while the brush is on each of the rela tively short contact plates, said elongated con~ tact member and the hollow rotatable member of liquid 44, that level will in Fig. 4, to leave part 46 the circuit. This liquid 44 having interengaging surfaces to preclude slip ping between the intercontacting areas thereof. into element 40 by merely scribed, an elongated stationary contact member; 4. In an intermittent switch of the kind de- ’ removing one of plates 56 for the same are re a series of relatively Short contact plates; a brush movably attached in place by screws or analogous 40 movable across the faces of the said contact means 6U. plates; a hollow rotatable element of conducting The manner of employing the intermittent material in constant contact with the elongated switch and one preferred way of constructing the contact member having an axially disposed part same has been made clear during the course of of conducting material in connection with the the specification, and since alterations may be said brush and insulated from the rotatable ele made without departing from the spirit of the ment; and current conducting liquid in the hol invention, it is desired to be limited only by the low element and in contact therewith, said ele* scope of the appended claims. ment being formed to cause the level of the liquid Having thus described the invention,` what is to shift to and from a point against the said part claimed as new and desired to be secured by Let while the brush is on each of the relatively short ters Patent is: contact plates, said elongated contact member 1. A switch of the kind described comprising being a rack, said rotatable member being a gear an elongated stationary contact member; a se» in mesh with the rack. ries of relatively short, spaced apart contact 5. A switch of the character set forth in claim plates; a brush disposed to move across the faces 2, wherein the hollow rotatable member is pro of the several plates of the series one at a time; vided with a series of internal radial pockets to a rotatable hollow element in constant contact receive the liquid as the member is turned about its axis. with the elongated contact member and in elec trical connection with the said brush; and a fill 6. A Switch of the character set forth in claim ing of current conducting liquid in the hollow 60 2, wherein the hollow rotatable member is pro element, said hollow element having its interior vided with a series of radial pockets to receive the formed to raise and lower the level of the con current conducting liquid, said Ipockets being ar~ ducting liquid as the element is rotated over the ranged to raise the level of the liquid against the axially disposed part only when the brush is on relatively long contact member, the switch being closed when the liquid level is raised to a prede one of the relatively short contact plates and to termined point and being opened when the liquid lower the level of the liquid to a point spaced from the said part when the brush is between the falls below said predetermined point, said hollow contact plates. element being formed and disposed with respect MILO F. MILLER.