Патент USA US2408166код для вставки
Sept» 24, 1946~ ` L. A, HARRAWOQD ' ¿408,155 FLUORESCENT SWITCH STARTER Filed Jan. 8, 1945 2 Sheets-Sheet l gi. ci? z? VRMWÃ,IN/, fv 6 ¿7 y@ /7/ www /g/ „fsm/.JJ www j?? É ¿33 a? IN VEN TOR. ATTE RN EYS _ Sept. 24, 1946. I|_„ A, HARRAWOOD FLUORESCENT SWITCH STARTER Filled Jan. 8, 1_945 \ 2,408,165 _ 2 Sheets-Sheet 2 INVENTOR. AWD R N EYS Patented Sept. 24, 1946 2,408,155 UNITED STATES PATENT GFFICE 2,498,165 FLUORESCEN'I‘ SWITCH STARTER Luther A. Harrawood, Broughton, Ill. Application January 8, 1945, Serial No. 571,870 6 Claims. My present invention, in its broad aspect, has to do with starting means for fluorescent lighting circuits, and the principle may be embodied in any suitable switch construction whether of the single, double or multiple pole type. I have found that automatic starting devices now associated with fluorescent lighting have a tendency to cause considerable trouble, whereas my invention (Cl. 20o-6) 2 tube, and numerals 2, 'à and 4, the usual three wire circuit, including leads to the condenser 5 and coil S; this circuit being conventional from the standpoint of starting and maintaining ie fluorescent lighting system. In the circuit is in terpolated a suitable snap switch mechanism gen erally designated by 'I mounted in an insulating casing 3 with a cover 9 held in place by screws I ll. The snap switch ‘I comprises a triple-arm plate sturdy assembly which is not likely to get out of 10 Il which is pivotally mounted on a pin I2 car order or become broken, is simple, positive, and is embodied in a compact Brieliy described, the structure bringing forth ried in the housing. Arms I3 and I 3a extend out push lever for closing the switch to start the is such that in its open position (Figure l) the wardly at an obtuse angle to each other and are my improved results, includes a simple, sturdy, switch contact arms, for engagement with con insulating casing in which is mounted a suitable snap switch for a lluorescent lighting circuit. 15 tact elements It and I5 in the circuit 4. An op erating arm I6 is located Ibetween arms I2 and I 3. Associated with the snap switch-is a second switch Referring to Figures 1, 3 and 4, it will be noted device which is spring operated to be in a nor that the are of pivotal movement of the switch ‘I mally open position and which has a handle or fluorescent lighting elements, and which remains free end l1 of the arm I5 is on one side of the 20 axis or fulcrum I2 while in its closed position closed only so long as pressure is applied, how (Figures 3 and 4) the free end Il is on the other ever, by spring means over-riding a center of side of the axis of fulcrum I2. rotation or the axis of movement of the snap Pivoted on the pin I8 is an arcuate plate I9 switch, and connected with the snap switch, the supported by frame 2e and having a depending snap switch is thrown to a closed position at the 25 arm 2l engaged by a spring 2‘2 which is attached same time the starter switch is operated. as at 23 to the casing. At the end of plate I9 My device therefore combines in a simple and is a, double contact element 24 engaging contacts eiïective apparatus means for starting and oper 25 and 26 in circuits 2 and 3, and connected ating a fluorescent lighting system, and is com pact, readily applied to conventional switch struc 30 with the plate at a point 21 moving from one side to the other of fulcrum point I2 of snap tures, practical and sturdy and unlikely to give switch 'I is a spring 28 connected with the end trouble or to become broken or deranged. Il of arm it. Spring 22 normally holds contact Other and equally important objects and ad element 24 out of engagement with the contacts vantages of my invention will be apparent from 25 and 2'5 in the position shown in Figures 1 and the following detailed description and drawings, 4. A linger lever or handle 29 on plate I 9 is but changes may be made in form, size, shape, engaged, as at A, to rotate the plate to engage construction and arrangement of parts, provided element 24 with elements 25 and 2S in which same fall within my broad inventive concept and the scope of the appended claims. position spring 22 is moved from one side of In the drawings wherein I have illustrated a fulcrum I2 to the other carrying with it the arm 40 preferred form of my invention: I6 thereby closing switch l. Contact between Figure 1 is a longitudinal section; element 2A and points 25 and 25 is sustained Figure 2l is a transverse section taken on the only so long as pressure is sustained at which line 2_2 of Figure 1; time all circuits are closed to start the iiuores Figure 3 is a partially diagrammatic view of a 45 cent lighting systems, continuance of lighting fluorescent lighting circuit in which my inven tion is incorporated and shows the starting switch mechanism in closed position with sustained fin ger pressure applied thereto, and being sustained by continued closure of snap switch 'I thereby accomplishing both starting and operation of the system in a single opera tion. A stop 3U limits the movement of plate I9 and a standard 3| supports the end of pin IS. From the foregoing, it is believed that the op In the drawings wherein like characters of ref eration, advantages and construction of my in erence are used to designate like or similar parts vention will be apparent, but interpretation throughout the several views: thereof should only be conclusive when made in The numeral I designates a fluorescent lighting 55 the light of the subjoined claims. Figure 4 is a View similar to Figure 3 with pres sure on the starting mechanism released. 2,408,165 3 4 to shift the arm from a position on one side of I claim: the fulcrum to the other, contact points in cir cuit with the lighting system to start the same, and spring means normally urging and holding ing an operating arm movable from one side to said plate with its contacts in open position. the other of the pivot point of the switch repre 3. The invention as defined in claim 2, Where senting the fulcrum, contacts for the switch in in a finger lever is provided to hold said plate circuit with the lighting system, a pivoted plate, manually with its contacts in open position. a connection from the plate to the operating arm, 4. The invention as defined in claim 2, where» said plate being movable to shift the arm from 10 in the point of attachment oi the spring with a position on one side of the fulcrum to the other, the plate and the operating arm shifts from one contact points in circuit with the lighting system side of the fulcrum to the other as the plate is to start the same, said plate having points to moved to open and close the circuit. engage the contacts in one position, and spring 5. The invention as deiined in claim 2 where means normally holding said plate with the con in a housing is provided with pins supporting tacts in open position. said snap switch and said plate, and is provided 2. A fluorescent lighting system starter, com with a. stop element `for the plate to limit its prising a pivoted semi-circular snap switch hav 1. A fluorescent lighting system starter, com prising a pivoted semi-circular snap switch hav movement. ing contact arms, an operating arm between the contact arms and movable from one side to the other of the pivot point of the switch represent~ ing the fulcrun'l, contacts for the switch in cir cuit with the lighting system, an arcuate pivoted plate having contact points, a spring connecting the plate with the arm, said plate being movable 20 6. The invention as deiined in claim 2, where in the housing has a cover through which the operating handle of the plate extends, and where in a standard is provided to support the pivoting pin for the plate. LUTHER A. HARRAWOOD.