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Oct. 22,‘ 1946. ‘ ' 2,409,889 J. OGDEN TIMING DEVICE ' Original Fiied Sept. 21, 1940 ‘ J” 2,409,889 Patented Oct. 22, 1946 ~ UNITED STATES " PATENT QQOFFICE“ TIMING DEVICE Jack Ogden, Huntington Woods,‘ Mich., assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Original application September 21, 1940, Serial No. 357,794. Divided and this application Sep tember 22, 1945, Serial No. 617,991 7 Claims. (Cl. 161—15) 2 1 ergizes the relay coil I56. The tube I44 on the other hand supplies power across another pair of more speci?cally to electrical circuits for meas condensers I18 and I80 which are in parallel uring minute time intervals and is a division of across a variable resistor I82 through lines I84 S.‘ N. 357,794 ?led September 21, 1940, The need and I86. The resistor I82 has two adjustable taps for means for measuring very small increments l88 and I90, the ?rst of these being connected of time has increased considerably and at the through line I92 to a cathode I94 of a “magic present time devices of this nature are much in eye” or 6E5 tube of the cathode ray type. Line demand. As one example which may be men I92 is also connected to one side of a resistor I96 tioned is that of timing the various steps of Weld and one side of condenser I98, the opposite side of ing machine cycles which are at the most a few the last-named resistor being connected by line electrical cycles long. There are of course many 200 to a stationary contact 202. The opposite other instances in which time intervals approxi side of the last-named condenser is connected mately the length of electrical cycles must be through line 204 to line 206, the latter being con measured for correct timing and operation.‘ It is therefore an object of my invention to 15 nected to a movable switch element 208 and also to the grid or control element 2I0 of the 6E5 provide timing means capable of measuring small tube. The stationary switch member cooperat time periods. ing with the movable switch element 208 is con It is a further object of my invention to pro nected by line 2I2 to a movable switch member vide such a timing device as can be easily trans 2I4 on the member actuated by the relay coil 58. ported and connected to means whose actuation ' This invention relates to timing devices and it is desired to time. Line 204 continues and is connected to a movable . switch point 2I6 movable with the members I16 It is a still further object of my invention to provide timing means which is easily and accu and 2| 4 all three of which are supported on a common bracket and moved simultaneously by With these and other objects in view which will 25 actuation of the relay coil 58. It should also be noted that the switches I68-l16 and 2I6—‘—2I8 become apparent as the speci?cation proceeds, are closed upon energization of the relay coil 58 my invention will be best understood by reference to the following speci?cation and claims and the - while switch 202-—2I4 is opened upon such ener gization. Any suitable spring bias means (not illustration in the accompanying drawing, in 30 shown) may be provided to return the movable which: ' switch arm upon deenergization of the coil '58 to ' 'Thel?gure shows a schematic Wiring diagram rately adjusted to read the required period. of the measuring system of my invention. its deenergized positionto close switch 202--2I4 and open switches I68--I16 and 2I6—2I8_ The movable contact 2I6 cooperates, as mentioned, ' Referring now more speci?cally to the drawing, there is provided a power supply line I40 of for example the conventional 110 volt 60 cycle to 35 with a stationary contact 2I8 which is connected by line 220 with a resistor 222 the opposite side of supply power for the indicating apparatus.’ This which is connected by a line 224 to a variable resistance 226 which is in turn connected to the incoming 110 volt line is connected to two rec ti?er tubes I42 and I44 which supply the nec essary direct current from the usual alter line I86. nating current supply. of the 6E5 tube are connected across a resistor The tube I42 supplies The remaining elements 228 and 230 direct current across a pair of condensers I46 and I48 and a resistor I50 through lines I52 and I54. The line I54 continues and is con nected to a relay coil I56 the opposite side of which is connected by line I58 to a variable re 45 232 and thence by common line 234 to the ad justable tap I90 on the resistor I82. The incom ing lines 56 and 28 connected to the operating relay 58 are supplied with power from the mech anism whose operating periods it is desired to sistor I60, the adjustable tap I62 of which is connected by line I64 to line I66, this line being measure. They may be connected across certain connected in turn to a stationary switch point I68, Between lines I54 and I66 there is pro vided a ?xed condenser I10. The adjustable tap I12 engaging resistor I50 is connected by line I14 to a movable switch point I 16 actuated by a relay coil 58 and cooperates with the stationary switch point I68 just described. Thus the tube I42 sup long the equipment is energized for any portion ‘plies power to charge the condenser I18 and en portions of a welding circuit to determine how of its cycle or they may be connected with some other equipment whose operating cycle it is de sired to time. The over-all operation of the system may be brie?y described in that when the relay coil 58 is energized the 6E5 pattern closes and if the 55 time period is such that the pattern will just 3 2,409,889 4 close without over~lapping the operator will be however, a series of impulses is being studied it able to determine from the setting on the variable resistor 226 which is calibrated in timed periods how long that time interval is. If the 6E5 tube will be comparatively easy for the operator to adjust the resistor 226 for, as far as he will be concerned, the cathode ray tube appears to have closes too far or over-laps then more resistance the opening or closing relatively stationary and will be introduced into the circuit and the read ing will therefore be less or vice versa, if the tube does not entirely close then less resistance is in he can adjust to the proper point. If it is de sired to study a different portion of the working cycle it will only be necessary to so connect lines serted so that the same may entirely and com 56 and 28 so that they will be energized by the pletely be closed. Therefore, when relay 58 is 10 new portion of the complete cycle whose duration energized and attracts its armature switches it is now desired to measure. I58--I16 and 2I8-2I6 close and switches 202 2I4 open the closure of switches I68-I1B causes the energization of relay coil I56 through the fol~ I claim: 1. In a timing device, a cathode ray tube hav ing a target and control electrode, a condenser lowing circuit: From the output of tube I42, line 15 connected to said control electrode whereby the I54, relay coil I56, line I58, resistor I60, tap I62, charge thereon will alter the pattern on the tar line I64, line I66, switch contact I68, switch con get, a source of voltage connected to the con tact I16, line I14, adjustable tap I12, resistance denser, a. variable resistance connected between I50 to line I52. At the same time tube I42 supplies the source and the condenser, switching means to voltage to the condenser I10 through an obvious 20 control .the circuit whereby the condenser is peri circuit. When the relay coil I56 is then energized odically charged and discharged and the pattern it attracts its armature and opens the switch 203. With the opening of this switch and also switch 202--2 I4 the ‘short circuit which has been applied to condenser I98 is removed and the closure of switch 2I6-2I8 applies to this condenser through a circuit to be described the output of the tube I44. This circuit is as follows: line I86, variable resistor 226, line 224, resistor 222, line 228, switch 2‘I6-2I8 directly to condenser I 98. on the target is simultaneously varied as the switching means is operated, and automatically operated delay means connected into said circuit to prevent immediate discharge of the condenser upon deenergization of the switching means. 2. In a timing device, a cathode ray tube hav ing a target, a source of power, a variable resist ance connected thereto and having a calibrated 30 dial, a control electrode in the tube, a condenser The amount of energy applied to the condenser I98 is regulated by the setting of the variable resistor 226, the dial of which is calibrated in cycles. This voltage is applied to the control ele ment or grid ZIO of the 6E5 tube and causes the shadow portion to become smaller and if resistor 226 is properly set will disappear entirely, the setting of this dial indicating the length of time of the operation. The necessary operating volt ages for the remaining elements of the tube are 40 provided by lines I92 and 234 through resistance I82 by obvious circuits. When the machine cycle has been completed and the relay 58 deenergized, the switches I68 I16 and 2I6--2I8 will open and switch 202--2I4 will'reclose, the opening of switch 2l6-2IB will remove the supply of energy from the condenser I98 and the opening of the switch I68-—I16 will open the circuit to the relay coil I56. However, connected thereto and to the resistance, whereby ‘the charge on the condenser controls the elec trode potential and the pattern on the target and the resistance varies the rate of charge so that a desired pattern may be obtained, the dial act~ ing as an index means, a shunt circuit for short ing out the condenser to discharge the same, switching means in the shunt, relay means to control the switching means and delay means to prevent the immediate deenergization of the re lay and shorting of the condenser upon general deenergization of the system. 3. In a timing device, a cathode ray tube hav ing a target and control electrode, a condenser connected to said control electrode whereby the 'charge thereon will alter the pattern on the tar get to indicate a predetermined charge, a source of voltage connected to the condenser, a variable resistance connected between the source and the this relay will not immediately drop its contact condenser, switching means operating in succes 208 inasmuch as the condenser I10 is directly sive timed sets of series, said sets having din‘erent across the relay terminals. This charge will length pulses but all of one series being of the slowly leak off and in a short time the switch 208 same length to control the circuit whereby the will drop, completing the short-circuit around condenser is brought to said predetermined the condenser I98 and discharging the same, re 55 charge as indicated by the cathode ray tube by turning the apparatus to its initial condition. a single series of pulses and if the length of the This delay is provided to allow a time to elapse pulses of a series is changed the resistance may between the charge and discharge of the con ‘be varied to still bring ‘the condenser to the same denser I98 so that the retina of the eye of the charge, and an indicating dial on said variable operator or observer may follow the ?uctuations resistance to denote the time during which the ‘on the shadow in the cathode ray tube. It will 60 series of pulses was applied. thus be ‘evident that as the variable resistor 226 is 4. In a timing device, a cathode ray tube hav altered to cause the shadow to completely dis ing a target, a control electrode in said tube appear without over-lap that the reading on this dial will give the duration of the portion of the 65 whose potential controls the con?guration on ‘said target, a source of power, variable resistance cycle being measured. means connected to the source, a condenser con In most equipment passing through or operat nected to said variable resistance and to the ing on a complete working cycle there is a suc control electrode, and a periodically timed switch cessive reoccurrence of that portion of that cycle controlling the circuit whereby as the length of in which the operator may be interested which 70 time the switch is closed is varied, the rate of will cause the indications on the 6E5 tube to charging the condenser may also be varied to re-appear at rapid intervals and the relay 58 bring the condenser up to a predetermined charge would therefore be rapidly and successively ener as indicated by the con?guration on the cathode gized for a series of similarily timed impulses for target. the given timed interval to be measured. Since 75 5. In a timing device, a cathode ray tube hav~ 2,409,889 5 ing a target thereon capable of producing a pre determined con?guration, a control electrode for said tube whereby when a certain voltage is ap plied to the electrode the con?guration will be produced, a condenser connected to the electrode, the voltage thereacross being applied to the elec-! trode, a source of power of substantially constant voltage, a variable resistance and a switch con nected in series between the source and the con 6 for similar time periods whereby by regulating said resistance the charge on said condenser may be brought to a given value though the time pe riod may be changed by altering the voltage applied and therefore the desired con?guration will be obtained to indicate this value, and dial means in conjunction with said resistance to indicate the time period involved since that is proportional to the voltage applied. denser, means operating said switch periodically for similar time periods whereby by regulating 7. In a timing device, a cathode ray tube hav ing a target and control electrode, a condenser said resistance the charge on said condenser may be brought to a given Value though the time pe connected to said control electrode whereby the charge thereon will alter the pattern on the tar riod may be changed by altering the voltage ap plied and therefore the desired con?guration will be obtained to indicate this value. get to indicate a predetermined charge, a source of voltage connected to the condenser, a variable resistance connected between the source and the condenser, switching means operating in succes 6. In a timing device, a cathode ray tube hav ing a target thereon capable of producing a pre sive time sets of series, said sets having dilferent length pulses but all of one series being of the determined con?guration, a control electrode for said tube whereby when a certain voltage is ap 20 same length to control the circuit whereby the condenser is brought to said predetermined plied to the electrode the con?guration will be charge as indicated by the cathode ray tube by produced, a condenser connected to the electrode, a single series of pulses and if the length of the the voltage thereacross being applied to the elec pulses of a series is changed the resistance may trode, a source of power of substantially constant voltage, a variable resistance and a switch con 25 be varied to still bring the condenser to the same nected in series between the source and the con denser, means operating said switch periodically charge. JACK OGDEN.