US3173030A - Timing control system - Google Patents

Description

2 Sheets-Sheet l INVENTOR ATTORNEYS W. M. WOODRUFF 'rIMING CONTROL SYSTEM F/G I II I ` March 9, 1965 Filed Oct. 27, 1960 Walter M. Woodfuf: by

March 9, 1965 w. M. wooDRuFF 3,173,030

TIMING coNTRoL SYSTEM Filed Oct. 27, 1960 2 Sheets-Sheet 2 Hg '25 `H3 f----L--- z I l L Vs' //4 Walter M Woodruff TTORNEYS United States Patent O 3,173,030 TIMING CONTRGL SYSTEM Walter M. Woodruff, 1172 26th Ave. N., St. Petersburg 4, Fla. Filed Oct. 27, 1960, Ser. No. 65,421 3 Claims. (Cl. 307-141) My invention relates to automatic timing systems, and more particularly to a load circuit controller which is capable of shutting off a load device after a predetermined period of operation, while resetting itself for the next period of operation. Generally speaking, the controller utilizes a novel type of circuit, having make and break switches, driving motor and cam means therefor, and a multi-position selector switch.

Many of the electrical devices found in the home and elsewhere are applied to uses in which it is des-irable to have the device Controlled by a timer. Thus, as an example, domestic refrigerators are provided with semiautomatic defrosters which having once been started manually, will continue -in operation for a pre-selected period, and then shut themselves off.l Automatic garage door opening systems have been provided With timing circuits which automatically close the doors at a predetermined time interval subsequent to the opening of the doors. The display window lighting systems of many commercial establishments are provided with automatic timers so that the lights, which are left on after closing, may be automatically extinguished after a pre-selected time interval. Coin operated, self service and amusement devices depend Iin many -instances on electric timing circuits for their control. The hereinafter disclosed timing control circuit will be found convenient for use in any or all of the above mentioned applications and in others not set forth herein. Therefore it should be understood that use of the term load device refers to any and all devices which are either powered or merely controlled by electrical means.

Therefore, it is an object of this invention to provide a timerfor shutting off a load device after a predeter mined time period.

Another object of this invention is to provide a timer for restoring a temporarily broken circuit to operation after a measured time interval.

Another object is to provide a novel timing control system which eliminates the need for relays or manual reset knobs for the purpose of resetting the control after an Operating cycle has been completed.

Still another object of this invention is to provide a novel timing control system which is simple, durable, compact in construction, positive in its operation and capable of withstanding substantial shock and vibration without being inadvertently actuated.

It is a further object of this invention to provide a timing control circuit which, upon being actuated Will deliver current to a load device over a predetermined period of time then reset itself for the next Operating cycle and finally shut off both itself and the load device which it controls.

The following description will revcal other objects and advantages of the invention to one skilled in the art.

The accompanying drawings, forming a part of this specification, disclose a preferred embodiment of this in vention and a modification thereof. In order that the invention may be clearly understood, the exemplary embodiment and modification thereof will now be describcd. However, it should be understood that variations in construction and wiring which fall within the scope of the appended claims will not depart from the spirit of this invention. Referring therefore to the drawings:

FIGURE 1 is a combined wiring and diagrammatic 3,173,03e Patented Mar. 9, 1965 'ice view of a timing control system in the preferred form of the present invention;

FIGURE 2 illustrates a modifica-tion of the preferred embodiment wherein the circuitry is identical but the actuating means for the switches in said circuit has been altered by the addition of a second cam means.

In `the preferred embodiment of my invention as shown in FIG. 1, the terminals 10 and 11 connect a work circuit, including a conductor wire 12, load device 13, conductor wire 17, single pole single throw switch 14, having blade 15 and contact 16, and conductor wire 18 to a source of electric current. It should be evident that the load device may be operated manually by means of the switch 14 without the intervention of the control circuit, since only the switch 14 breaks the work circuit at any point. Considering, for present purposes, that the load device 13 is an electric light bulb, the circuit 10, 12, 13, 17, 14, 18 and 11 will be found to be typical of lighting circuits used everywhere.

The various operative elements of my control circuit as shown in FIGURE 1 include: double pole double throw switch 32; conductor wires 24 and 25, connecting switch 32 in parallel with on-otf switch 14; branch circuits emanating from the output terminals of the switch 32, one of said branch circuits comprising conductor Wire 37, double pole single throw switch 39 and conductor Wire 38, the second of said branch circuits comprising conductor wire 35, double pole single throw switch 40 and conductor, Wire 36; a drive motor 55; a control circuit for said driving motor comprising conductor wires 49, and 51;4 and cam means 53 rotatably driven to operate the switches 39 and 40.

By means of conductor wire 24, which is attached to the lighting circuit at point 21 between the load device and the switch 14, and by means of the conductor Wire 25, which is connected to the lighting circuit at point 22 between the switchvand Iterminal 11, the control circuit is Wired in parallel with the manual on-of switch 14. Each of the two conductor wires 24 and 25 is connected to one of the blades 26 and 27 on double pole double throw switch 32. Depending upon its position the double pole double throw switch will connect either one of the double pole single throw switches 39 or 40 in a parallel relationship with switch 14, through its respective branch circuit. Th'e switches 40 and 39 include insulating blocks 43 and 44 in each of which is embedded a pair of flexible and readily movable contact fingers joined by insulating connecting members 45 and 46, respectively. Each switch also lincludes a pair of shorter and relatively fixed contact members which are likewise supported on the in'sulating blocks 43 and 44. Both switches are of identical constructions.

The switches 40 and 39 are actuated by cam means 53 through actuating arms 47 and 48, each of which is secured at one end to one long contact finger on one of the switches, while its other end frictionally engages the surface of a driving cam. The above mentioned cam is provided for the purpose of making and breaking the contact of the switches 40 and 39 in a sequence, which is vital to the operation of my invention. The sequence and its relation to the operation of my timing control circuit will now be explained.

Cam means 53 is arranged and constructed so that as the shaft 52 on the driving motor rotates, the contacts of switches 39 and 40 are alternatively closed with a short period of simultaneous closure at the time of alteration from one switch to the other. Thus the raised portion of the cam must have an arc long enough to prevent the energized switch from opening until the other switch has also been closed. Therefore the raised portion of the cam means 53 must constitute an are in .contact .arms of switch 40.

excess of l80. Phasing the operation of switches 39 and 40 in such a way that one closes before the opens is vital and essential to the operation of my circuits By means of an conductor Wire 51 attached 'to line terminal through connector Wire 12 and by ;means of Conductor wires 49 and 50, the driving 'r'notor 55 is energized. Conductor Wire 49 which joins one movable contact arm on switch 40 with the corresponding movable contact arm on switch -39 is connected to the motor windings by Conductor Wire 50. Each of the movable contact arms is energized at such times, and only at such times, as the switch of which it is a part is cioscd and connected to the Work Circuit through double pole double throw switch 32. Thus the Vmotor 55, operates whenever either or both o f the switches 40 and 39 are closed and one of them is energized.

From the foregoing description it should be apparent that the double pole double throw switch 32 serves as a selector switch by means of which one of two branch circuits may be used to bypass the switch 14 in the lighting Circuit. One of the double pole single throw switches 40 and 39 is located in each of these branch circuits. Referring now to the branch Circuit of which the switch 40 is a part, said branch Circuit has at one end the contact 31 of double pole double throw switch 32, said contact being mounted so that it will touch contactor arm 27 when it is moved to the left. Conductor Wire 35 joins the contact 31 to the two center As Was explained previously, one of the outside contacts `on switch 40 is connected to the Conductor Wire 49. The remaning outside contact on ,switch 40 is connected by Conductor Wire 36 to.contact.30 on 'double pole double throw switch 32. Contact 30 is mounted so that it will touch contactor arm 26 when contactor .arm 26 is moved to the left. .In a -similar manner the contacts 28 `and 29 serve as the ends of .a branch circuit .which includes ,contact ,29,

.Conductor Wire 38, two center contacts of the switch vof current to vthe control driving motor 55. Since the switches 40 and 39 'control the flow of current yboth to and from the drivingmotor and to the load device, neither the 'load device nor the driving motor will operate unless one of the switches 40 or 39 is closed and the branch 4circuit of which it is a part is connected to the work circuit through double pole double throw switch 32. On the other hand, if either of the switches 40 or 39 is closed, but the Circuit of which it is a part is not connected to the lighting Circuit by double pole double throw switch 32, the driving motor will be unatfected and inoperative even while the manual on-otf switch 14 is closed and the light is on.

In order that the various uses of my invention may be fully understood, I shall now describe the operation of the preferred embodiment set forth herein. For purposes of Convenience let use assume that the last operating cycle employed the branch Circuit of which the switch 39 is a part, that the control circuit has subsequently shut the light 13 and itself off, and that the manual on-olf switch 14 is in the otf position.

Assuming the foregoing condition, the double pole double throw -switch 32 will be found to be thrown to the right, switch 39 Will be found open and the switch 40 will be found closed. Automatic operation is initiated by throwing the double pole double throw switch to the left, thereby closing the branch Circuit of which the switch 40 is a part. As a result the load device will be energizcd by a circuit having the following path: terminal 10, Conductor Wire 12, load device 13, Conductor' Wire 17 to junction 21, Conductor wire 24, contactor arm 26, contact 30, Conductor Wire 36, switch 40, conductor Wire 35, contact 31, contactor arm 277, Conductor Wire 25 to junction 22, and Conductor Wire 18 from junction 25 to terminal 11. Simultaneously the Control motor circuit is closed from terminal 10 through Wire 12 to junction 23, Conductor Wire 51 to motor Windings, Conductor Wire 59, switch 4%, Conductor Wire 35, contact 31, contactor arm 27, Conductor Wire 25 to junction 22, and Conductor Wire 18 to terminal 11. Thus the control motor starts at the same instant the load device is energzed. As the motor turns the cam, the leading edge of the raised portion of cam 53 rotates in a counter-clockwise direction.

FIGURE 1 of the drawings shows the cam 53 as having rotated approximately one-quar'ter turn from the beginning of the cycle which began with actuating arm 48, in the dwell of cam 53 adjacent the trailing edge of the raised portion of cam 53, and with the actuating arm 47 of switch 40 standing upon the raised portion of the cam 53, the switch 40, the'refore, being closed.

Let us now follow the operation of the switches 40 and 39 as the cam rotates counter-ciockwise from the` postion as shown in FIG. l. Just prior to the time when actuating arm 47 reachcs the trailing edge of cam means 53, actuating arm 48 of the switch 39, which has been travelling in the dwell of cam 53 throughout the cycle, Will be engaged by the leading edge .of the raised portion of vthe cam 53, thus closing the switch 39. After the switch 39 closes the actuating arm 47 on the switch .40 Will drop oif the trailing edge into the dwell of ca'rn 53 and theload device and 4motor circuits which pass through the switch 40 will be broken on account of the opening of said switch. Thus the load device and the Control ldriving motor have been shut off automatically. Although the switch 39 is now closed, no current flows in the Circuit, since branch'circuit of which the switch 39 is a part is open at the double pole double throw switch 32, which was previously thrown to the left and remanis in that position.

Now .that the switch 39 is closed, and the switch 40 is opened, the double pole double throw switch 32 still remains in its previous position with the contacts 26 and 27 engaging contacts 30 and 31, and the on-otf switch 14 remains open. Whenever it is desired to initiate another cycle of operation, -it is necessary only to throw the double pole double throw switch to the right completing a cir- `cuit along the following path: terminal 10, Conductor Wire 12, load device 13, Conductor Wire 17 to junction 21, Conductor Wire 24, contactor arm 26, contact 28, conductor Wire 37, switch 39, Conductor Wire 38, contact 29, contactor arm 27, Conductor Wire 25 to junction 22 on Conductor Wire 18 and Conductor Wire 18 to terminal 11. The load device is now energized. The driving motor is also energized by circuit proceeding from terminal 10 along Conductor Wire 12 to junction 23, conductor Wire v51, the motor Windings, Conductor Wire 50, Conductor Wire 49, the switch 39, Conductor Wire 38, contact 29, contactor arm 27, Conductor Wire 25 to junction 22 on conductor Wire 18 and Conductor Wire 18 to terminal 11.

Throughout the ensuing cycle the actuating arm 48 of theiswitch 39 Will be riding on the raised portion of cam 53 while the actuating arm 47 of the switch 40 rides in the dwell of the cam 53. Just prior to the time when the trailing edge of the raised portion of cam 53 approaches the actuating arm 48, the leading edge of the cam Will engage the actuating arm 47 thus closing the switch 40. Actuating arm 48 then drops off the trailing edge of the cam opening the switch 39 and breaking the motor and load device circuits which pass therethrough. The system is now restored to the condition in which We found it, the same condition assumed at the beginning of this description of operation. Although the opposite sides of the axis of said shaft.

. switch 40 is now closed, the branch circuit of which it is a part is broken at the double pole double throw switch 32; hence it is incapable of closing and completing the work and motor circuits.

In the foregoing description, the double pole single throw switches were arranged, as shown in FIG. 1 in a diametrically opposed relationship wherein said switches are driven or actuated by a single cam. Alternatively, it is possible to mount the double pole single throw switches so that each is driven by its own cam. Such a modification is the subject of FIG. 2 of the drawings, which will now be explained in full.

Here, as in FIG. 1, is shown a lighting circuit comprising line terminal 110, conductor Wire 112, load device 113, conductor Wire 117, manual on-off switch 114, conductor Wire 118, and line terminal 111. Since the only break in this lighting circuit occurs between the contact 116 and contactor arm 115 of the switch 114, the load device may be operated manually by means of the switch 114 without the intervention of the control circuit, which I will now describe.

The double pole double throw switch 132, double pole single throw switches 140 and 139, driving motor 155, drive shaft 152 and conductor wires 124, 125, 135, 136, 137, 138, 149, 150 and 151, all of which are shown in FIG. 2, correspond with and perform the same functions as double pole double throw switch 32, double pole single throw switches 39 and 40, driving motor 55, drive shaft 52 vand conductor wires 24,25, 35, 3-5, 37, 38, 49, 50 and 51, all shown in FIG. l. Each of the two conductor wires 124 and 125 is connected to one of the blades of the double pole double throw switch 132. By shifting the double pole double throw switch 132 to one position or the other, either of the double pole single throw switches 139, 140, may be connected in such a Way as to obtain current from the hot side of the switch 114 circuit and to `bypass manual on-otf switch 114.

The switches 140 and 139 are identical in construction to the switches 40 and 39 of FIG. 1 and include insulating blocks 143 and 144, insulating connecting members 145 and 146, for the movable contact fingers of said switches, and actuating arms 147 and 148. Switch 140 is actuated by cam 154 and switch 139 is actuated by cam 153.

The cams 153 and 154 are arranged and constructed in such a way as to produce the same sequence of making and breaking the switches 140 and 139 as was described in connection with FIG. 1. As shown in FIG. 2, the switches 140 and 139 are shown side by side in parallel planes which include their respective cams, the two cams being identical and aflixed to the shaft 152 in such a way that the axis of shaft 152 and the leading edges of cams 153 and 154 are all in the same plane With the leading edges of the two cams being disposed in said plane on The combined Operating cycles of the double pole single throw switches 140 and 139 require that the raised portions of the cams 153 and 154 each describe an arc in excess of 180. Thus the trailing edges of these cams do not fall within the same plane described by the axis of shaft 152 and the respective leading edges of cams 153 and 154.

It would, of course, be possible to alter the position of switch 153 or 154 by rotating it through a given angle in its plane. This expedient might be desirable from a design standpoint, allowing easier access to the switches. However, its respective cam must then also be rotated through a corresponding angle with respect to the shaft 152 in order to preserve the proper relationship between cams and switches.

Repeated use of this timing device causes each of the double pole single throw switches 139 and 140 to go through a cycle wherein each switch is first closed for a relatively longer portion of the cycle and then opened for a relatively shorter portion of said cycle. The cycle of each double pole single throw switch is identical to that of the other; however, the cycles are 180 out of phase with one another. Any configuration of said cams and double pole single throw switches which falls within the appended claims and which produces the same phase relationship between the cams and switches as explained above does not depart from the spirit of my invention.

In order that this modification of my invention may be understood clearly, I shall now describe its operation. As before, let us assume beforehand the conditions which prevail just before the control circuit is thrown into operation. Assuming that the last Operating cycle employed the 'branch circuit of which the switch 140 is a part, that the control has subsequently shut the light 113 and itself off, and that the manual on-off switch 114 is in the off position, it will be found that the double pole double throw switch 132 is thrown to the left, the switch 140 is open and the switch 139 is closed. The single act of throwing double pole double throw switch 132 to the right, closes the branch circuit of which the switch 139 is a part, energizing the load device through the following circuit: terminal 110, conductor Wire 112, load device 113, conductor Wire 117 to junction 121, conductor-Wire 124, contactor arm 126, contact 128, conductor wire 138, switch '139, conductor Wire 137, contact 129, contactor arm 127, conductor Wire 2125 to junction 122 and connector Wire 118 from point 122 to terminal 111. Since the switch 139, which is closed, is now receiving current from the hot side of the load device circuit, the control motor windings are energized by a circuit which includes terminal 110,-conductor Wire 112 to junction 123, conductor Wire 151, the motor windings, conductor Wire 150, conductor Wire 149, switch 139, conductor Wire 137, contact '129, contactor arm 127, conductor Wire 125 to junction 122 and conductor Wire 118 to terminal 111. Thus the control motor starts" at the same instant the load device is energized. i As the motor turns the cams, the leading edge of the raised portion of the cam 1'53 upon which actuating arm 148 Was resting at the beginning of the cycle rotates in 'counterclockwise'direction The drawing shows the 'carn's 153 and 154 "as having rotated approximately onevthird turn from the beginning of the cycle. `It should be remembered that the cycle Was started With the actuating arm 148 actually standing upon the raised portion of the cam 153, the switch therefore, being closed. Let us now follow the operation of the switches and 139 as the cams simultaneously rotate counterclock- 'Wise from the position as shown in the drawings. Just prior to the time when actuating arm 148 reaches the trailing edge of cam 153, actuating arm 147 of the switch 140, which has been traveling in the dwell of cam 154 throughout the cycle, Will be engaged by the leading edge of cam 154, thus closing the switch 140. After the switch '140 closes, the actuating arm 148 on the switch 139 will drop off of the trailing edge into the dwell of cam 153 and the circuits to the load device and to the motor which pass through the switch 139 will be broken on account of the opening of said switch. Thus the load device and the control driving motor have been shut off automatically. Although the switch 140 is now closed no current fiows in the circuit, since the branch circuit of which switch 140 is a part is open at the double pole double throw switch 132, which was previously thrown to the right and remains in that position.

Now that the switch 140 is closed, and switch 139 is open, the double-pole double throw switch 132 still remains in its previous position of contacts 126-127 engaging contacts 128-129, and the on-otf switch 144 remains open. Whenever it is desired to initiate another cycle of operation, it is necessary only to throw the double-pole double-throw switch to the left, completing a circuit along the following path: terminal 110, conductor Wire 112, load device 113, connector Wire 117 to junction 121, conductor Wire 124, contactor arm 126, contact 130, conductor wire 136, switch 140, conductor Wire 135, contact 131, contactor arm 127, conductor Wire 125 to juncton 122 on couductor Wire 118 and 'conductor Wire 118 to terminal 111. The load device isnow ene'rg'izcd4 The driving motor is also energized by a circuit proceeding from terminal 110 along Conductor Wire 112 to juncton 123, conductor Wire 1, the motor windings, conductor .Wire 150, Switch 140, condnctcr Wire 1315, wltfcf 131, .Contactor arm 127, Condnctor Wire 125 to ilniiqn 122 on conductor wire 118, conductor Wir? 118 to terminal 1-11. -Throughout the ensuing cycle the atuator arrn of switch 140 will be rding on the raised portion of cam 155'I while the actuating rm 148 o f the switch 139 rides in the dwell of carn 153. Just prior to the time when the trailing edge of the raised portion of the cam 154 approaches the actuating' arrn 1577, the leading edge of the cam 153 will engage the actuating arm 148, thus closing the switch 139. Atuating arrn 147 then drops off the trailing edge of the cam 154, opening switch 140 and breaking the motor and load device circuits, The system i`s 110W restored to the condition in which w found it, the same condition assumed at ,the beginning of this description of4 operation. Although the switch 139 is now closed, the b'ra'ncli circuit o f which it is a part Will remain broken at the doublefpole doublethrow switch 132 until it is thrown to the right, lienc switch 139 is incapable of closing and Complfiflg ;the Work and motor circuits until .such time.

From the above description of the operation of my invention it should be apparent that, in either of the tw o exan'iples set forth hereln, each time Y the A( louhle pole .double 'throw switch vis reversed, the above squence of operation will be nitiated with the energiing of -th ad device, and that the cycle ,will end the resettlpg o f the cam operated switches and the dfcnergiaing of the road device without any funhr attention nom :the gnerator. Thus my invention will be fouhd usefpl for modifiction of or addition to any .circuit .whjhit is gie- 'sired to have broken after a .predetermined Line intryal .without attentionfrom ,the operator, r example, ;the double-pale doublethrow switch, the `srigl-,pol V81.,.031111? vthrow switches, the .operatirig motor and v,the to: gether with the wires congecting ;th .douhlpfpql doyhlethrow switch :to the double-,pole single thrwswitches and connecting the 'ltter ito the dIiYiIlS 1319 1'., I?? housed in a small ,cabinet and connected ;1,9 ,ew '1.18 llt facilities in a .garage belonging to a dwelling ;hqose By adding this control circuit 4to ;the ,existing ;light Jsystem in his garage, a home owncrwouldtbe hl Q 'W111 0111x119 lights upon entering the garage, xlaviflg .111.6 ,12911391 :19 turn off the lights after this departure in ;his autorriohile. By modifying the .doublepole double-throw switch such a way that `it could be reversed by an Airnpiilse ,from a coin collector, this circuit would .be useful in coin-op erated timers for serve-yourself washingrnachines, l aun dromats, hotel roorn 4radios and sets, exercising devices and the like` Flexibility in the 'lengthof the operting v,cycle may .he achieved by altering the V.speed of drive shaft -5 2. The shaft speed is controllable by means of .yariable speed transmissions between the motor and shaft, or by the use of a rheostat to Control-themotor vspeed whereby any other means which should be obvious to those skilled vin the art.

I claim:

1. A cycle timerfor controllinga work circuit-having a manual on-otf switch, said cycle timer enabling said manual switch to baby-passed Wheniinits off position and comprising a driving motor and ircuittherefor, a double pole double throwswitch having two input contacts, one of said input contacts being connected to each side of said manual on-olf' switch, said double pole double throw switch also having two sets of output contacts, a first branch o ircu'it connected to one of said output contacts, a second branch circuit connected to the other of said sets of output contacts, switch means located in each of said branch circuits, a cam rotatably driven by said motor for Operating' said first and second switch means whereby the work circuit, load device and motor circuit are simultaneously closed upon throwing said double pole double throw switch and energizing one of said branch Circuits, said work circuit, load device and motor Circuits being simultaneously deenergized when'the switch means in said energized branch circuit is opencd by rotation of said cam, the opening of said switch means in said energized branch circuit occurring after the switch means in the other branch Circuit is closed by the rotation of the cam4 2,. A cycle timer for controlling a work circuit, said cycle timer comprising a driving motor and circuit therefor, o multi-position selector switch, a series of branch circuits connected to said multi-position selector switch, switch meansl in said branch circuits, conductor wires oonnecting said switch means With said load device and said driving motor circuit, cam means rotatably driven by said motor for Operating said switch means, means for altering .the speed o f said motor whereby the Work circuit, load device and motor circuit may be simultaneously energized for a variable time interval upon adjusting said speed varying'rneans and changing .the position of said multi-position selector switch, thus energizing one of said branch circilits, .said Work circuit, load 'device 'an-d motor cireuits being simultaneously deenergied when the switch means in :said branch Circuit is opened by its cam means ,after the switch means in another of said lbranch circuits closes 3. A ycy''lxe timer lfor controlling a Work circuit for a manual voil-oil?switch, said cycle timer enabling said maniial .switch to he by-passed When in its off position and comprising a vmotor and circuit therefonmeans for adjus'ting the speed of said driving motor, a double pole double throw having'two input 'contacts, one of said input contacts being connected to each side of 'said manual on-otf switch, said double pole double throw Switch also having t'wo's'ets'of output contacts, a first branch circuit connected to one of said output contacts, a' second brahch circuit tconnected to the other of said 'sets of output contacts, switch means located in each of said branch circuits,la pair of cams rotataobly driven bysaid motor for'actuating said first and second switch means, Whereby the work circuit, load device and motor circuit are sirnultaneously closed upon throwing said double pole doublethrow switch and energizing one of said branch circuits, said Work circuit, load device and motor circuits being simultaneously deenergized when the switch means in said energized .branch circuit is opened by its respective cam after the other of said cams closes the switch means in the non-energized branch circuit.

References -Cited in the file of this patent UNITED STATES PATENTS l,228,993 Vandy June 5, 1917 1,936,464 Wey Nov. 21, 1933 2,452,537 Anderson Nov. 2, '1948 2,593,813 Van Derwalter Apr. 22, 1952 2,8%,944 Sheffield et al Sept. 17, 1957

Claims (1)

1. A CYCLE TIMER FOR CONTROLLING A WORK CIRCUIT HAVNG A MANUAL ON-OFF SWITCH, SAID CYCLE TIMER ENABLING SAID MANUAL SWITCH TO BE BY-PASSED WHEN IN OFF POSITION AND COMPRISING A DRIVING MOTOR AND CIRCUIT THEREFOR, A DOUBLE POLE DOUBLE THROW SWITCH HAVING TWO INPUT CONTACTS, ONE OF SAID INPUT CONTACTS BEING CONNECTED TO EACH SIDE OF SAID MANUAL ON-OFF SWITCH, SAID DOUBLE POLE DOUBLE THROW SWITCH ALSO HAVING TWO SETS OF OUTPUT CONTACTS, A FIRST BRANCH CIRCUIT CONNECTED TO ONE OF SAID OUTPUT CONTACTS, A SECOND BRANCH CIRCUIT CONNECTED TO THE OTHER OF SAID SETS OF OUTPUT CONTACTS, SWITCH MEANS LOCATED IN EACH OF SAID BRANCH CIRCUITS, A CAM ROTATALY DRIVEN BY SAID MOTOR FOR OPERATING SAID FIRST AND SECOND SWITCH MEANS WHEREBY THE WORK CIRCUIT, LOAD DEVICE AND MOTOR CIRCUIT ARE SIMULTANEOUSLY CLOSED UPON THROWING SAID DOUBLE POLE DOUBLE THROW SWITCH AND ENERGIZING ONE OF SAID BRANCH CIRCUITS, SAID WORK CIRCUIT, LOAD DEVICE AND MOTOR CIRCUITS

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