US1719535A - Calling device for wireless telegraphy - Google Patents

Calling device for wireless telegraphy Download PDF

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Publication number
US1719535A
US1719535A US512439A US51243921A US1719535A US 1719535 A US1719535 A US 1719535A US 512439 A US512439 A US 512439A US 51243921 A US51243921 A US 51243921A US 1719535 A US1719535 A US 1719535A
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United States
Prior art keywords
contacts
relay
plungers
disk
magnet
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Expired - Lifetime
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US512439A
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English (en)
Inventor
Davis Wilfred John
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RCA Corp
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RCA Corp
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Publication date
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Publication of US1719535A publication Critical patent/US1719535A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L15/00—Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code
    • H04L15/24—Apparatus or circuits at the receiving end
    • H04L15/26—Apparatus or circuits at the receiving end operating only on reception of predetermined code signals, e.g. distress signals, party-line call signals

Definitions

  • WILFRED JOHN DAVIS OF PLYMOUTH, ENGLAND, ASSIGNOR TO RADIO CORPORATION V OF AMERICA, A CORPORATION OF DELAWARE.
  • the dbject of this invention is to provide improved apparatus by which an alarm can be automatically given on the receipt of a predetermined combination of Morse characters such as the international distress signal S. O. S. (0 forexample although the arrangement may be adjusted to respond to any prearranged combination.
  • a relay A is provided in a receiving circuit, say, in the anode circuit of a valve (not shown), and cach time this relay is closed a current is caused to pass through a slow acting relay B which only closes for a dash butnot for a dot.
  • This slow acting' relay B controls the.
  • a ratchet wheelhaving fast with it a disk is turned one tooth by the second electromagnet F each time it is energized, that is, for each dot and each dash.
  • spring plungers which can move parallel to the axis and the number of which is equal to the number of teeth on the ratchet wheel.
  • Adjacent to each plunger is a spring finger pivoted to the disk and adapted, on any plunger being moved outwards from the face of the disk to slip in under the head of the plunger to lock and keep it protruding from the face of the disk.
  • the other contact plungers Q on the bracket are adapted to make electrical connection with the head of anyl protruding plunger I which may be opposite them, that is, the six dot contacts are normally open but are closed when there is a protruding plunger on the disk opposite one of the six plungers on the bracket.
  • the bracket When, however7 the required sequence has been set up none of the plungers I on the disk opposite the six plungers Q, onthe bracket will be protruding and therefore all the nine contacts will be open and the bell or other alarm will be actuated. Unless, however, the predetermined combination of signals has been received some one or more of the contacts will be closed and therefore the bell or other alarm will not be actuated.
  • a plunger ⁇ it may be caused to actuate a spring lever which pushes the plunger outwards from the disk as shown in Fig. 2.
  • the slow acting relay may be an ordinary electromagnet having stout copper bushes around the pole tips, so that the eddy currents set up in the copper retard the building up of the magnetic flux.
  • a slow acting space relay C may be provided to control the circuit of an electromagnet E which will only be energized by inter-letter spaces and not by the spaces between the elements of a letter.
  • Fig. 1 of which is a diagram showing the connections
  • Fig. 2 is a side elevation in partial section of the apparatus
  • Fig. 3 is a face view of the disk along the section line III. III. of Fig. 2
  • Fig. 4 is a rear View of the apparatus
  • Figs. 5 and 6 are sections on the lines 5-5 and 6-6 of Figure 4.
  • Figure 7 is a diagram showing a modification.
  • Fig. 1 A is a signal relay the coils of which are in the anode circuit of a receiving valve so that the tongue T follows the dots and dashes of the incoming signals.
  • a delayed action marking relay B connected to a battery A
  • a delayed action spacing relay C also connected to the battery A. The contacts of these delayed action relays B and C do not close until some little time after the contacts T and M and T and S respectiva,
  • the relay B is adjusted to close for a dash and not for a dot, while the relay C is adjusted to close when a space at least equal to that between letters is received but to remain open for the shorter spaces between elements of a letter.
  • D the dash magnet
  • E the space magnet
  • F Also connected in series with T and M and in parallel with relay B is a ratchet controlling magnet F which is operated whenever T contacts with M.
  • a number of contacts G in parallel withI a bell X or other form of alarm or recording device connected across them are inserted in series with B, C, D, E and F, therefore every time contacts T and M of the signal relayy A close, a current will flow round the coils B andF and across such of the contacts at G as are closed. If the contacts T and M remain closed for a longer period than is represented by a dot then the contacts of relay B close and D is energized.
  • FIG. 2 An arrangement for controlling the contacts G is shown in Fig. 2 in which H is a disk which is preferably made of aluminum to reduce its momentum and which has a number of plun ers I, 1 to 24 fitted round its periphery. Eac plungerl is kept in position by a spring J under compression which pulls the head of the plunger on to the face of the disk.
  • the disk is fast on a spindle O which has also fast with it a ratchet wheel L having Y a number of teeth (24) equal to the number of plungers on the disk; a pawl P operated by the magnet F engages with this wheel and every time the tongue of relay A returns to its position of rest after having been moved by a dot or dash, that is to say, every time the contacts T and M open, the disk H is rotated through one tooth of the wheel L.
  • a light locking finger R Fig. 3 Pressed against the head of each plunger by a spring 1' is a light locking finger R Fig. 3) so that when a plunger is pushed outward from the disk the finger R will slip in under its head and so prevent the plunger from re-A turning to its normal position when released.
  • the alarm bell shall ring after the signal c 0 0 has been received.
  • a space that means that the tongue T and spacing contact Sof the relay A are closed for an appreciable period so that the contacts of the delayed action spacing relay C close.
  • the space magnet E is therefore energized and let us assume that plunger I is pushed outwards by the space lever or ar- CTI mature lever E and locked by its finger R.
  • the signal commences the contacts Tand S open .and the spacelever or armature is released and remains so until the end of the signal and the plungers I2 to 110 which rotate in a counter-clockwlse direction as indicated in Figure 3, and passed by" armature E are not actuated.
  • the plunger I10 When the space after thel last dot occurs the plunger I10 is actuated.
  • the first three dots of the signal close the contacts T and M of relay A three times and i after each dot is completed it causes the disc H to be rotated through one tooth of the Aratchet wheel L by closing the relay F without the operation of the dash relay offfthe movement of plungers 113,114, 115; now when the rst dash comes alongf the contacts of the relay Blo'se, this causes the dash ma et D to be energized and the plun er 1 Wixch is in front of'D is therefore pus ed outwards from the disc.
  • the dash ends Whenv the dash ends the disk is rotated through one tooth.
  • the other two f dashes act similarly to push plungers IH, Il, outwards.
  • the last three dots cause the disk to be rotated through three teeth and plungers 11 I2, and I21 are not affected because the dash ma et is not energized.
  • a dot merely causes t e disk to b e subsequently rotated through one toothof the ratchet wheel, while a dash causes a plunger to be pushed outwards as well as siibsequentlyvrotating the disk throu h one tooth.
  • vand I2 are extra lungers and in the illustration given, no s ort circuiting devlces are used in conjunction therewith.
  • a fixed insulated bracket V In front of the disk H is a fixed insulated bracket V,
  • the lastthree plungers haveno function so that the position of the first nine counting from the stops K and N are the ones Jvwhich control. From this it is seen that a continuous operation is maintained and no at- ⁇ tention is required when once. the'device is 110 placed in operation.
  • the lapparatus may be reset by isimplypushing in one of the short circuiting switches as at G which allows suliicient cur- 11.5
  • the delay with thisarrangement is the time taken by tongue 5 f relay 6 to make one swing, this is governed by the inertia of the tongue and the tension of the restoring spring.
  • a main relay adapted to be actuated by incoming signals, a slow-acting relay controlled by the main relay, an electromagnet controlled by the slow-actin relay, a second electromagnet in parallel with the slow-acting relay, a set of normally closed contacts in series with both electromagnets, means whereby said contacts are selectively controlled by the magnets in accordance with the length of the received impulses,- and an alarm shunted by said contacts, so that opening of the set of contacts by the electromagnets actuates the alarm.
  • an electromagnet energized by impulses corresponding to dashes only
  • a second elecitromagnet energized by impulses corresponding to both dots and dashes
  • a set of normally closed contacts in series with both electromagnets, means whereby said contacts are selectively controlled b the magnets in accordance with the length ofY the received impulses, and an alarm shunted by said contacts, whereby upon opening of said contacts by the electromagnets the alarm is actuated.
  • an alarm and af magnet which is energized by relatively long electrical impulsesl only,' secondmagnet which is energized by both relatively long and relatively short electrical impulses, ⁇ a disk carrying round its periphery a set of plungers, means operated by the first ma et to cause plungers to protrude from the ilsk, means actuated by the second maxet for rotating the disk through the angle etween two plungers and a set of contacts which are controlled by the plungers and which short circuit the alarm, another magnet energized on the occurrence of an inter-letter space to actuate some of the plungers on the disk.
  • an electric calling device the combination of an alarm and a magnet which is energized by relatively loiig electrical impulses only, a second ma et which is energized by both relatively nng and relatively short electrical impulses, a disk carrying round its periphery a set of plungers, means operated by the first magnet to cause plun ers to protrude from the disk, means actuate b lthe second ma et for rotatin the dis through the angle between two p ungers and a set of contacts w hich are controlled b the" ⁇ plungers and which short circuit the a arm,
  • an electric calling device the combination of an alarm and a magnet which is energized by relatively long electrical impulses only, a second magnet which is energized by both relatively long and relatively short electrical impulses, a disk carrying round its periphery a set of plungers', means operated by the first magnet to causeplun ers to protrude from the disk, means actuate by the second magnet for rotating the disk through the angle between two plungers and a set of contacts, shunting said alarm, con-v trolled by said plungers, the set ofcontacts being so arranged in front of the disk that some contacts are normally closed while others are normally open.
  • an alarm in combination, an alarm, a magnet energized by im- Y pulses corresponding to dashes only, a sec ⁇ l ond magnet energized by impulses corresponding to both dots and dashes, a set of contacts normally short-circuiting ,said alarm, plungers associated With said contacts, some of which are controlled by the two magnets, and another magnet for controlling other of said contacts -by means of-said plungers, said. last mentioned vmagnet being energized only on occurrence-of inter-letter spaces;
  • a step by step rotating? element means for rotating the element a Y step each time an element of a signal is received, sliding means carried by theelement, l switching means carried on a stationary part and affected by the sliding means, actuating means controlled by certain signals and .in-
  • AIn combination a step by step rotating element, (means for rotating the element a step each time an, element of a signal is received, sliding means carried bythe element, switching means carried on a stationary part and affected by the sliding means, actuating means controlled by certain elements of the signal for actuating the sliding means, lockinfr means adjacent the sliding means for holding said sliding means in actuated position over a period of rotation .of tlie rotating element, and releasing means for unlocking.
  • the locking means to release the slidingmeans to its original position for canceling the ef fect of incorrect signals, said releasing means determining the locking period 'of 'the locking means. .A
  • Y 10 In combination, a. step by step rotating element, ⁇ means for 'rotating the element a .step each time an clment of a signalis ref ⁇ ceived, sliding means carried by the element, switching means carried on a stationary part and affected by the sliding means, actuating means controlled by-certain elements of the signal for actuating the sliding means, lockingmeans for the sliding means to hold the sliding means in actuated position over a period of rotation of the rotating element, and releasing means for unlocking the locking means to release the slidingmeans to its original position for canceling the effect of incorrect signals, said releasing, means determining the locking period of the locking means, the switching means being so arranged as to produce a change of circuit conditions only when actuated by a proper sequence of si nal elements throughthe sliding and loc ing means. l
  • astep by step rotating element means for rotating the elementa step each-time an element of a signal is received, sliding means carried bly the element, switching means carried on a stationary part andv effected by the sliding means, actuating means .controlled by certain elements ofthe signal for actuating the sliding means, lockin g means for the sliding means to hold the sliding means in actuated position over a period of rotation of the rotating element, releasing 'means 'for' unlocking the locking means to release the sliding means to its original position for canceling the effect of incor- -rect si nals, the switching means being so arrange as to produce a-cha-nge of circuit conditions only when actuated by a proper sequence of signal elements through the sliding and locking means, and alarm means operated by the switching means in response lto change of circuit conditions.
  • a slow acting relay controlled by the first re.- lay, a magnet controlled by said slow acting relay, a second magnet in parallel with ⁇ the slow actingrelay, a set of contacts inseries with both magnets, a signallingcircuit including a source -of power and an alarm normally short circuited' bythe -set of contacts, and means controlled by said magnets in accordance with the signal impulses and intervals for'relatively positioning the contacts of theset to remove -the ⁇ short circuit whereby "the Aalarm-is rendered operative.
  • a relay in Acombinatin, a relay .actuated by incoming signals,y aslowactingrlay controlled by the rst relay, a magnet controlled by said slow acting ⁇ relay, a-second magnetparallel with the slow acting relay, a of contacts in series with .both magnets, a 'gnalling circuit including a source of, power and an-.alarm normally short circuited by saidset of contacts, andmeans operatively interposed vide of signals and intervals to position the contacts of the set to remove the short circuit and render the alarm operative.
  • a signalling circuit including a source of power' ⁇ and an alarm, a magnet energized .by impulses corresponding to dashes only, a second magnet energized by impulses corresponding to both dots and dashes, a set of contacts in series with both magnets and normally 'short circuiting said alarm, and
  • a signalling circuit including an indicating device and a source of power, means for normally short circuiting s aid indicating device including a plurality of normally closed contacts, a signal relay, a slow acting, spacing relay associated therewith,.a spacing magnet associated with said spacing relay, a-slow acting marking relay associated with said signal relay, a dash magnet associated with said marking relay, a ratchet control Amagnet in 'parallel with said slow marking relay, a rotatable disk, a ratchet wheeled integral with said disk, a ratchet interposed between said ratchet control magnet.
  • a signalling circuit including a source of power and indicating means, a plurality of contacts normally short circuiting said indicating means, a signal relay, switching means associated therewith,
  • a signalling circuit including a source of power. and an alarm, a magnet energized by impulses corresponding to dashes only, a second ma et energized y impulses corresponding to oth dots and dashes, a set of contacts in series with both magnets and normally 'short circuiting said alarm, and
  • a ratchet control magnet in parallel with said slow markin relay, a rotatable disk, a ratchet wheele integral with said disk, a ratchet interposed between said ratchet control magnetand said ratchet wheel, a plurality vof plungers slidably located around the periphery of said 'rotatable disk cooperating withV said normally) closed contacts, an armature interposed etween said dash mavnet and the periphe of said disk, a second armature inter-pose between said space magnet and the periphery of said disk and means operated by said armatures in response to'a predetermined signal for rotating said Wheel and operating said plungers to open all of said contacts.
  • a signallin circuit including a source of power and in icating means, a plurality of contacts normally shortcircuitingsaidindicatin means,asignal relay, switching means associated therewith,

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Burglar Alarm Systems (AREA)
  • Near-Field Transmission Systems (AREA)
US512439A 1920-12-20 1921-11-03 Calling device for wireless telegraphy Expired - Lifetime US1719535A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35755/20A GB177240A (en) 1920-12-20 1920-12-20 Improvements in calling devices adapted to be operated by wireless signals

Publications (1)

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US1719535A true US1719535A (en) 1929-07-02

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US512439A Expired - Lifetime US1719535A (en) 1920-12-20 1921-11-03 Calling device for wireless telegraphy

Country Status (4)

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US (1) US1719535A (enrdf_load_stackoverflow)
FR (1) FR544674A (enrdf_load_stackoverflow)
GB (1) GB177240A (enrdf_load_stackoverflow)
NL (1) NL11285C (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485551A (en) * 1944-08-29 1949-10-25 Western Union Telegraph Co Signal controlled selector
US2489638A (en) * 1944-12-11 1949-11-29 Ipsophon Patentgesellschaft A Arrangement for switching on and initiating processes by means of telephone calls
US2497936A (en) * 1946-10-18 1950-02-21 Rca Corp Code printer
US2517559A (en) * 1946-03-02 1950-08-08 Standard Telephones Cables Ltd Presettable impulse register
US2577085A (en) * 1949-07-13 1951-12-04 Ibm Multielement code translator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485551A (en) * 1944-08-29 1949-10-25 Western Union Telegraph Co Signal controlled selector
US2489638A (en) * 1944-12-11 1949-11-29 Ipsophon Patentgesellschaft A Arrangement for switching on and initiating processes by means of telephone calls
US2517559A (en) * 1946-03-02 1950-08-08 Standard Telephones Cables Ltd Presettable impulse register
US2497936A (en) * 1946-10-18 1950-02-21 Rca Corp Code printer
US2577085A (en) * 1949-07-13 1951-12-04 Ibm Multielement code translator

Also Published As

Publication number Publication date
GB177240A (en) 1922-03-20
FR544674A (fr) 1922-09-26
NL11285C (enrdf_load_stackoverflow)

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