US2113617A - Relay - Google Patents

Description

April 12, 1938. L. s. HARRISON 2,113,617

RELAY A Filed April 19, 1935 2 Sheets-Sheet l 44 55 43 g 4 26 j 5l 52 uwgllwu--m @ily-iv NVENTOR. 6 MQ ATTO Ey April 12, 1938. L. s. HARRISON 2,113,617

RELAY Filed April 19, 1935 2 sheets-sheet 2 IN V EN TOR.

' ATToR Y n Patented Apr. 12,`

OFFICE j SAMU RELAY l Inrenoes. Harrison, Binghamton. N. Y., assignor to International Business Machines Oor- ;otion, New York, N. Y., aces-poration o( New sppumam spi-n 1o, ms. sei-isi No. '17.246

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This invention relates to electrically controlled vmechanisms and more particularly toa relay which is responsive only to currents of certain frequency characteristics. lThe invention still more speciilcally relates to relays responsive to certain frequency characteristics of the vibrating reed type by means of which reeds tuned to vvibrate in resonance with certain' frequencies operate to close oropen lcontacts or both for the purpose of selectively controlling circuits.

It is the .object of this invention to provide a relay having two 'circuit controlling contacts each controlled by frequency responding memb'ers adapted to be responsive at diiferent frequencies.

Another object ol' this invention is to provide a relay havinga reset mechanism' for restoring the relay contacts to normal position after having been moved out of normal position by actuation of the relay.

Still another object is to provide La. relay having twotuned reeds surrolmded by a single coil, each-reed being responsive to a diil'erent frequency of current passing through said coil.

A still further object is to provide a relay in n* which tuned reeds are responsive to diileret current frequencies transmitted to said relay and in` which each reed supports an ann of a contact which is tripped to actuate said contact upon vibration of the reed corresponding to said f contact.

embodying the invention'or from an inspection of the accompanying drawings, and the invention also constitutes certain newand novel features bracket 1 is mounted which supports' a square shaped magnet yoke 8, the upper horizontal side of which terminates in `pole faces l leaving a small air gap Il (Fig. 3). The lower horizontal side Ii of the yoke has integral with it a boss 5 I2 which has an extension I3 on one side to v which reeds I4 and li are anchored. The extensions I-8 act as a stiil'ener and are of different lengths selected to anchor the reeds in such a way that each has a diiferent but deilnite period 10' of vibration Thus the reed that is supported lowest down with the short stiifener will have 'a slower period ofvibration than the reed which has the stiener 'extended higher along the reed. In the present 15 lower frequency; i. e., 60 cycles and normally holds the reeds in a vertical position -so that the ends are held steady substantially in the centerI of the air gap Il between the pole faces (Fig.13).' v The bracket Il is Jformed upwardly at one end and to this end are mounted two groups of contactsprings insulated from each other'and terminating in contacts Il and il for onesroup and 2l and 2l for the other group. The center contact springs have contact arms 23 and 24. exv tending at right angles to thecontact springs.

"Ihesecontact'armseachextendacrosstheplane 35 ofoneofthereedssothattherelsonecontact arm corresponding to and associating with each tunedreed. Flxedtotheend of eachcontact annisa rigid dependingmember 2l whichrests ontheendofthereeddirectlyunderitasviewed 40 inl'lgsothatbothcontactarmsarethusnormally supported by its corresponding reed and lsuch a position contact I and 2| are normally closed. It will be seen that if either one or both close. It

so that the end or the depending member 25 is raised above the end ofl its corresponding reed, the reed will assume its normal position so that when the contact arm is lowered the depending member 25 will again rest on the end of reed iti and the contacts 26 and 2i will be restored to their normal or original position.

To accomplish this restoration a reset mechanism is provided. A bracket 26 is mounted on the base 6 and on this bracket is mounted a magnet 21 and a cylinder 28 of an air dash pot. The magnet coil is enclosed in a metal cylindrical jacket and cooperates with a solenoid plunger 23 extending into the core of the magnet winding. The plunger 29 is pivotally fastened to an arm 36 which is in turn pivotally mounted at 3i to an extension 32 xed to the metal jacket oi the magnet coil.

The opposite end of the arm 36 is pivotally connected to a link 33 which is in turn pivotally fastened to an arm 34. The arm is pivotally mounted at 35 to the bracket 26, (Fig. 2). The arm 34 is biased in a clockwise direction by means of a spring 36 fastened between its upper end and a stud 31 on the bracket 26. The lower end of the armo 34 is bifurcated and engages a pin 38 in the end of the piston 39 which is slidably mounted within the air dash pot cylinder 28. An arm 46 is pivotally `mounted at 4I to the bracket 26 and is slightly biased in a clockwise direction by a spring 42 which is fastened to said arm at one end and to arm 36 at the other end.

A projection 43 on the arm 46 is formed over to cross into the plane of a pawl 44 which is pivoted vat 45 on the bracket 26 and is biased in a clockwise direction by the spring 46 fastened to said pawl and to a stud 41 on the bracketnrember which also acts as a limit stop for the movement of the arm 46 in a counterclockwise direction since the extension of said arm abuts said stud.

The pawl 44 is provided with a shoulder 49 which latches on the formed-over portion 43 of the arm 46 and prevents said arm turning in a clockwise direction unless unlatched. Pivoted to the arm 46 is a link 50 which is pivoted at its other end to a U-shaped member 5I which is piv- .oted on the stud 31 mounted on the bracket 26 so that the legs of the U-shaped arm straddle the bracket. 'I'he other arm 52 of said U-shaped member carries a stud 53 of suitable insulating material which extends under the contact arms 23 and 24 (Fig. 1). Thus if this U-shaped member is turned in a clockwise direction, the stud 53 will lift both contact arms 23 and 24.

A stud 54 is provided on the arm 36 and cooperates With a` downwardly inclined tail piece 55 on the pawl 44 so that a movement of the arm 36 to the right will cause the stud to hit the tail piece and cam the pawl 44 in a counter-clockwise direction to remove the shoulder 49 from its latching position against the formed out portion 43 to permit the arm 46 to rotate in a clockwise direction.

The operation of the reset mechanism is as follows:- Assuming one of the reeds have been vibrated to permit one of their associated contacts to function. The reset magnet coil 21 will become energized in a manner later to be explained in connection with the circuits. 'I'his magnet will then draw its solenoid plunger into its coil rotating the arm 36 clockwise about its pivot. This rotation will-be' retarded in its speed by the action of the dash pot as the arm 36 pushes the arm 34 counterclockwise about its pivot through atraen' the link 33, and thus pushes the piston into the air chamber. As the arm 36 moves counterclockwise it increases the tension in the spring 42 fastened to arm 46 since said arm is latched against rotation by the pawl 44 as previously described. As the arm 36 approaches its limit of travel in a clockwise direction, the stud 54 cams the pawl 44 out of latching position, as previously explained, and the arm 46 is moved in a counterclockwise direction by the increased tension in the spring 42, and by means of the link 56- rotates the arm 5I of the U-shaped member in a clockwise direction to lift the contact arms to a height suilicient to permit the reeds to be restored to a supporting position for said contact arms. o

When the restoring magnet is deenergized the spring 36 rotates arm 34 clockwise and pushes the link 33 to the left as viewed in Fig. 2. The pivot stud 51 is provided with an extension which extends into the plane of the link 50 and said link is provided with a shoulder 56. As the link 33 is moved to the left the extension of said pivot stud 55 bears against the shoulder 56 and causes the arm 44 to he moved counterclockwise, this movement continuing until the extension 46 strikes the limit stud 41 by which time the arm 46 has moved far enough for the shoulder 46 of pawl 44 to latch up behind the formed-over portion 43 of the arm 46.

'Iurning now to the wiring diagram shown in Fig. 4 to show the functioning of the relay. It will be understood that the closing of contacts I8 or 26 could be used to control relays or other equipment which could be placed in parallel with the reset coil 21. It is the purpose here however to describe and explain how the relay itself oper- Yates and not what it may control by its operation. Let it be assumed now that we have a regular 110 volt 60 cycle commercial current source of supply being transmitted over lines 66 and16l and that said current isoperating a motor 62 which is connected by means of a shaft 63 to two high frequency generators 64 and 65,- generating currents of 1800 and 1200 cycle frequency re# spectively. Blocking condensers 66, 61, 6I arid 69, are provided i the circuit to prevent' the flowing back of the 60 cycle frequency current or any other stray frequency other than for what that circuit is tuned for. Switches 16 and 1I are provided in the generator circuits and may be automatically operated by time controlled means or by cyclically operated cams, or numerous other well known methods, or they may be operated manually. depending on the use to which the relay may be put. It will be noted that the biasing coil I1 is constantly energized, being connected across the 60 cycle lines 66 and 6I by means of wires 12 and 13, with a resistance I1a in series withsaid coil.

It will be further noted that one side of each generator is common and grounded at 14. Now let it be assumed that the switch 1I is closed for one second and opened again. When said switch is closed a circuit is completed from one side of the 1200 cycle generator 66 through the condenser 61, switch 1I, \wires 16 and 16, contact I6 (normally closed) condenser 66, main coil I6, to ground 11 and thence to ground connection 14, wire 16 to the generator. The energlzation of the main coil I6 by the 1200 cycle current will cause the reed I4 tuned to thatl frequency to vibrateand cause contacts I6 to close and contacts I9vto open. The opening of contactsiil will immediately open vthe circuit tothe main coil and the closing of contacts Il will now close a circuit from line 60 of the 60 cycle power line, through wires 19, 80, 1I and 1B, contacts I I (now closed), reset magnet 21, wire 13 to the other sideof the supply line 6 I 'Ihe reset magnet then operates to reset the contacts as previously described, closing contacts I9 and opening contacts Il. Aspreviously stated, any suitable work or lcontrol circuit, can be taken from the reset magnet cillcuit such as shown by the dotted line circuit l In asimilar manner if the switch 10 is closed a circuit is established from one side of the 1800 cycle generator 64 through condenser 88,. switch 1l, wires l0, 1l and 82, contacts 2|, condenser 88, main coil Il, ground connection 11 to ground connection 14 and backto the generator 84. The

4reed Ill tuned to'respond to this frequency will vibrate causing contacts 2i to open and contacts 20 to close, again establishing a circuit through the reset magnet 21 from supply line 80 through wires 19, Ill, 1l and 82, contacts 20 -(now closed) wire 83, reset magnet 21, wire 13 to supply line The energization of the reset magnet will again cause the contacts 20 and 2| to be reset to their normal position as previously explained.

While the fundamental and novel features of I v the invention as applied to a single modification *have been shown anddescribed and pointed out,

vit will be understood that various omissions and 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 deand operable by the vibration of said members,

into a closed position, electromagnetic means for restoring said closed contacts to open position and a circuit extending from said contacts to saidelectromagnetic means whereby the closure of the contacts causes the electromagnetic means vto become operable to restore said contacts from .closed to open position. l

2-1m electromagnetic device including a resonant reed having a certain resonant frequency,

means including electromagnetic means for vibrating said reed at resonant frequency, a circuit controller controlled by saidreed and operable by the vibration of said reed for movement into operative position, electromagnetic means for restoring said circuit controller to inoperative position, a circuit extending from said .circuit controller to said electromagnetic restoring means and another circuit extending from said circuit' controller to said electromagnetic'vibrating means whereby the movement of saidcircuit controller into operative position renders the electromagnetic vibrating means ineffective and the electromagnetic restoring means effective.

.3. An electromagnetic device including a resonant reed having a certain frequency of vibraftion, means including electromagnetic means for vibrating said reedat resonant frequency, a circuit. controller comprising a normally open contact and normally closed. contact, means controlled by said reed for normally holding the last named contact in closed position, said last-'named y anaal? means being operable by the vibration ofsaid reed at its resonant frequency for causing the normally open contact to be closed and the normally closed contact to be opened, and a circuit included in the ilrst named means extending from said normally closed contact to said electromagnetic vibrating means whereby the opening of said normally closed contact terminates the vibration of said reed by the electromagnetic means.

4. An electromagnetic device including a resonant reed having a certain frequency of. vibration, means including electromagnetic means for vibrating said reed at resonant frequency, a circuit controller comprising a normally open contact and a normally closed contact, means normally latched in position by said last named reed to hold said contact in closed position, said lastnamed means being unlatched by the vibration of said reed at its resonant frequency to cause the normally open contact to be closed and the normally closed contact to be opened, `electromagnetic means for restoring said contacts to normal position, and a circuit included in the nrst named means extending from said normally open contact to said electromagnetic means whereby the closing of said normally.Z opened contact renders the electromagnetic restoring means effective to restore said contacts to open position. 1.

5. An electromagnetic device including a resonant reed having a certain frequency of vibration, means including electromagnetic means for vibrating said reed at resonant frequency, a circuit controller normally heldin one position controlled by said reed and operable by the vibration of said reed for movement into an alternate position, a restoring device for restoring said circuit controller to its normal position, said restoring device including an electromagnetl connected to a. circuit extending from restoring device and operable upon movement of the circuit controller to its alternate position, anv armature operated thereby, a speed retarding device, and a member controlled by the conjoint operation of said speed llsl retarding device and said armature, whereby the operation of said electromagnet causes said member to lmove'the circuit controller to its normal first named position.

6. An electromagnetic device including a plurality of resonant reeds each aving a dlerent frequency of vibration, electromagnetic means for vibrating each reed at its resonant frequency, said means including an electromagnst for receivlng electrical current impulses of diiferent frequencies .whereby the reeds are severally vibrated in response to current impulses received by said electromagnet of frequencies corresponding to the frequency of vibrati of said'reeds,

a plurality of circuit controllers normally held in a certain position each controlled by a different reed and operable by the vibration of its controlling reed for moving the circuit' controller controlled by said vibrating reed into an alternate position, a restoring device for restoring all circuit breakers to their normal certain positions, said restoring device including an electromagnet connected to circuits extending to each of said circuit controllers and operable upon movement or any one of sale circuit controllers to its alternate position and means-operated by said electromagnet upon energization thereof for restoring` said circuit controllers to their normal iirst named certain position.

'loA

7. An electromagnetic device including e. resoswitching member to said normal position, and nant reed having a certain frequency of vibrameans controlled by said switching member for tion, Aelectromagnetic means for vibrating said causing the latter when moved to its alternate reed at resonant frequency, anwitching member position to render the electromagnetic means incontrolled by said. reed and movable from noroperative and to renderthe restoring means 5 mal position to on alternative position ioy the operativeI Vibration of said reed, means for restoring seid LAURENCE S.. HARRISON.

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