Патент USA US2120787код для вставки
June 14, 1938. G. LOWKRANTZ' 2,120,787 TIME DELAY DEVICE Filed Dec. 1, 1936 6 f L 50 g 7 o 7 - Z7 F\ 20K 9' 3/ 4 ' 11 0 2o 25 l2 /6 . l5 k“24 23 22 l9 8 /0 /7 /3 K2! /8 “ /4 ‘f INVENTOR. m BY ' A TTORNEY Patented June 14, 1938 2,120,787 UNITED STATES PATENT OFFICE 2,120,787 TIME DELAY DEVICE Gunne Lowkrantz, Endicott, N. Y., assignor to International Business Machines Corporation, New York, N. Y., a corporation of New York Application December 1, 1936, Serial No. 113,620 9 Claims. This invention relates to time delay mecha nisms and more particularly to mechanisms adapted to delay the applicationof a connected load to a supply circuit whereby the supply cir cuit may be conditioned properly during the 5 delayed time interval and then automatically connected to the applied load. A speci?c application of the present invention is in connection with various electric discharge 10 devices such as thermionic tubes. In order to secure long tube life it is desirable to delay the application of any load thereto until suf?cient time has elapsed for the cathodes to become com pletely heated after the supply source has been 1 OK connected thereto. An object of the present invention is to pro Vide means whereby the load circuit is connected to the supply source or circuit after a prede termined timed interval has elapsed after the 20 controlling element has been operated. Another object of the invention is the provi sion of means whereby the time delay mechanism becomes effective if any interruption in the sup ply power occurs during the initial said prede termined timed interval or at any time there after. Various other objects and advantages of the invention will be obvious from the following par ticular description of one form of mechanism 30 embodying the invention or from an inspection of the accompanying drawing; and the invention also constitutes certain new and useful features of construction and combination of parts here inafter set forth and claimed. In the accompanying drawing, a circuit dia 35 gram is shown of the invention showing dia grammatically the control elements thereof. Referring to the drawing, a full wave recti her I is shown representing one type of power 40 supply unit, the anodes of which are connected in the usual manner to the terminals of the secondary winding 2 of transformer 3, the center tap of said winding connected to one side of the _ coil of clutch magnet 4 and the other side of which is connected to one terminal or side of the secondary winding. The cathode potential is supplied by the additional secondary winding 5, the center tap of which is connected to the power supply conductor 6 and any desired load 1. Any suitable means to rotate shaft 8 may be provided such as motor 9 to rotate continuously the said shaft, upon. which a clutch member ID is slidably keyed or secured and adapted by means of the pivoted extension of armature II to be 55 positioned to engage a clutch member I2 which 50 (Cl. 250-27) is attached to or may be an integral part of the cam 13 which are rotatably mounted on shaft 8. A support member I4 is shown for shaft 8 and upon which is attached a stop ?nger l5 to engage a stop IS on the cam so as to prevent 5 the cam to be returned farther by spring ll when the clutch members are disengaged. Co operating with cam I3 is a cam follower I8 mounted on the arm 19 which is an extension of spring blade 20. The multi-contact switch 2| 10 comprises a plurality of normally open contacts 22, 23, and 24 and a normally closed contact 25. The contacts are so adjusted that as the cam. I3 is rotated and due to its con?guration actuates the spring blade to the right, the contacts are 15 adapted to be operated in the following order; ?rst contact 22 closes followed in succession by the vclosure of contacts 23 and then contacts 24; ?nally, when the said contacts are closed, con tacts 25 are opened. The operation of the mechanism is as follows: Upon closure of the main switch the secondary Winding 2 and 5 of transformer 3 are energized. The clutch magnet 4 connected directly to wind ing 2 is energized to attract its armature l l caus 25 ing the clutch members It and IE to be engaged. Through the normally ‘closed contacts 25, con ductor 21, speed control resistor 28, or like device, the motor 9 is energized rotating shaft 8 and the cam 18 through clutch members It and i2 which are now engaged. The tube cathode starts to heat at the same time the clutch magnet and motor are energized. It will be noted at this time that the load 1 is disconnected from the out put of the tube 1 by means of the normally open contacts 22, .23, and 24. The cathode continues to be energized and heated for a predetermined time interval equivalent to the time necessary for the cathode to attain its proper operating tem- ._ perature before the high section or lobe of the cam 13 approaches the cam roller or follower I8. As the cam is rotated at a predetermined rate and in accordance with the elapsed time required, the spring blade 2|] will gradually be positioned so that contacts 22 are closed. By this time the cathode is completely heated and the tube passes current which ?ows from the cathode through ?lter condenser 30, resistor 3|, and contacts 22 to the center tap of winding 2. The said resistor limits the initial charging current of the condenser and as the condenser is gradually charged to nearly full voltage, the spring blade 20 is positioned to close contacts 23 which causes the resistance 3| to be shunted from the described circuit and thereby the con 2 2,120,787 denser 30 is connected directly across the recti iier output to be fully charged. Finally, con rotation of said cam element thereby maintain ing the said contacts operated. tacts 24 are closed to connect the external load 4. The invention set forth in claim 3 pro vided with means to return the cam element to 1 directly to the center tap of winding 2 thereby connecting the load directly to the power supply therefor. After connecting the load to the recti ?er tube the normally closed contacts 25 in the motor circuit are opened to cause the motor to be deenergized. The cam i3 remains in its ?nal 10 position to maintain the said contacts in an operated position so long as the clutch magnet 4 remains energized so that the clutch members I0 and I 2 remain engaged. If, however, there is an interruption in the supply voltage at any 15 time, due to power failure or opening of the switch 26, etc., the clutch magnet 4 is deenergized to release its armature and disengage the said clutch members, whereupon the spring I’! will return the cam. 53 to the normal starting position 20 and is prevented from being returned to any other position by means of stops it and i5. In this manner, the ‘cathode will always have sul? cient time to regain the proper operating tem perature before the load is again applied to the 25 tube. While there has been shown and described and pointed out the fundamental novel features of the invention as applied to a single modi?cation, it will be understood that various omissions and 30 substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without de parting from the spirit of the invention. It is the intention therefore to be limited only as indi 35 cated by the scope of the following claims. What is claimed is as follows: 1. A device of the character described com prising, in combination, a thermionic tube com prising cathode and anode elements and circuits 40 therefor, means to energize the cathode circuit, a load circuit, control means comprising cam operated contacts, and means to operate said contacts after energization of the said cathode circuit for a predetermined timed interval there 45 by connecting the said load circuit to the anode circuit. 2. A device of the character described com prising, in combination, a. thermionic tube com prising cathode and anode elements and circuits 50 therefor, a supply source to energize the said circuits, a load circuit, control means comprising cam operated contacts, means to operate said contacts after energization of the said cathode circuit for a predetermined timed interval there 55 by connecting the said load circuit to the anode circuit, and means to maintain the said con tacts operated during the time the supply source is effective to energize the said circuits. 3. A device of the character described com 60 prising, in combination, a cam element and sup porting means therefor, means to rotate the supporting means continuously, means to con nect the cam element and the said supporting means thereby rotating the cam element from 65 a normal starting position, contacts: operated by said cam element, and means to prevent further the normal starting position. 5. A device of the character described com prising, in combination, a thermionic tube com— prising cathode and anode elements and circuits therefor, a supply source to energize the said circuits, a load circuit, a cam and rotating means 10 therefor, control means energized by said supply source to operate the cam rotating means, con tacts cooperating with said cam and operated a predetermined timed interval after energization of the said control means to connect the load circuit to the anode circuit, and means to pre vent further rotation of said cam thereby main taining the said cam contacts operated. 6. A device of the character described com prising, in combination, a thermionic tube com 20 prising cathode and anode elements and circuits therefor, a supply source to energize the said circuits, a load circuit, a cam normally positioned in an initial starting position and rotating means therefor, control means energized by said supply 25 source to operate the ca‘). rotating means, a plurality of contacts cooperating with said cam and operated a predetermined timed interval after energization of the said control means to connect the load circuit to the anode circuit, 30 means to prevent further rotation of said cam thereby maintaining all the said cam operated contacts in operative position, and means upon discontinuance of the supply source and de cnergization of said control means to return the .35 said cam to said initial starting position. 7. The invention set forth in claim 6 in which the cam con?guration is such as to operate the said contacts progressively. 8. A device of the character described com 40 prising, in combination, a rectifier tube compris ing cathode and anode elements and circuits therefor, a supply source to energize the said circuits, a load circuit, control means, a 0011 denser, and means including time delay means to operate the said control means a predeter mined timed interval after energization of the cathode circuit to ?rst connect the condenser to said anode circuit and then connect the load circuit to said anode circuit including the con denser. 9. A device of the character described com prising, in combination, a recti?er tube com prising cathode and anode elements and cir cuits therefor, a supply source to energize the said circuits, a load circuit, control means, a condenser and a charging resistor therefor, and means including time delay means to operate the said control means a predetermined timed interval after energization of the cathode cir cuit to connect ?rst the condenser and resistor to the anode circuit, then shunting said resistor from the anode circuit and then connecting the load circuit to said anode circuit including the condenser. 65 GUNNE LOWKRANTZ.