US2607848A - Telegraph keyboard transmitter - Google Patents

Telegraph keyboard transmitter Download PDF

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Publication number
US2607848A
US2607848A US95964A US9596449A US2607848A US 2607848 A US2607848 A US 2607848A US 95964 A US95964 A US 95964A US 9596449 A US9596449 A US 9596449A US 2607848 A US2607848 A US 2607848A
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United States
Prior art keywords
lever
bail
selector
key
bars
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US95964A
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English (en)
Inventor
Walter J Zenner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Teletype Corp
Original Assignee
Teletype Corp
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Filing date
Publication date
Priority to BE495935D priority Critical patent/BE495935A/xx
Application filed by Teletype Corp filed Critical Teletype Corp
Priority to US95964A priority patent/US2607848A/en
Application granted granted Critical
Publication of US2607848A publication Critical patent/US2607848A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L17/00—Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
    • H04L17/02—Apparatus or circuits at the transmitting end
    • H04L17/04—Apparatus or circuits at the transmitting end with keyboard co-operating with code-bars
    • H04L17/06—Contact operating means

Definitions

  • the present invention 'pertains to telegraph transmitters and more particularly to telegraph transmitters controllable from a manually operated keyboard.
  • the primary object of the invention is to provide a simple, compact and efficient apparatus fortra nsmission of telegraph signals at very high speeds.
  • -Another-object of the invention is to provide in .atransmitter, a rocking contact arrangement for (generating accurate chatter-free signals.
  • a furtherobject of the invention is to provide ialkeybo'ard operated device wherein the key action is smooth, uniform and light to the touch.
  • cam drum having aseries of cam projections arranged helically to effect through a corresponding series of interponentspwhich are settable permutably by a novel keyboard structure, the operation of a transfer mechanism to vibrate a transmitting contact mechanism to distribute the signalimpulses over thesignal-line.
  • Fig. 1 is a fragmental [plan view showingessential elements of the keyboard transmitter according to the invention
  • Fig.2 is a front elevational view, partly in section, of the device shown in Fig. 1; i
  • Fig. 3 is a sectional view taken on line 33 of 'Fig. 1;
  • Fig. -8 is a fragmentary elevational view, partly in section, showing an arrangement for preventing the simultaneous operation of two or moreke'ylevers; I v
  • Fig. '9 is a fragmental 'crossfsectional' view of l4 mounted on abracket l5.
  • '10 is a sectional view taken on line ill-I fl of Fig. 9;
  • Fig. 11 is a sectional view taken .onl-ine H of Fig,-1, and
  • Fig. 1'2' is a fragmental view showing the alterna'te'position of the key lever locking bail.
  • the present apparatus embodies primarily a base I'll which is provided at its forward portion with a keyboard of the usual form, and which is adapted to house the key levers and the selector mechanisms operated thereby.
  • Mounted on the base are the power drive means, signal generator and related parts which are selectively controlled by the aforementioned selector mechanism.
  • a motor H for supplying the power for operating the keyboard transmitter of the present invention is appropriately mounted on the base :portion '10 in position to efiect' the rotation of a single operating shaft [2. All the parts are thus suitably supported inlsuch a manner as to form .a compact 'selfrc'o'ntained unit.
  • the base I0 is provided at its frontwith a keyboard comprising keylevers l2 operated by. keys [3.
  • the keylevers or key members 12 are slidable verticallyand areg'uide'd at one end by a guide comb
  • Each of the key vmembers 1-2 is 'pivotally articulated at I6 to an associated selector lever I! mounted pivotally .on a-common pivot shaft l8 suitably supported on brackets 19 (one at each end) fixed to the base portion l0.
  • distended between a depending portion '22 of lever I! and the lower end of its associated key member I-2 tends normally to'bia'sfthe lever l!
  • Each of the keymembers lzi's' provided with an upwardly directed'portion 23 to which'is fitted its individual key top or cap-l3.
  • Key caps 13 areiprovided with individual flange portions 24, and are 'removably attached .to the portions 23 by means of chin strap? type "springs-25. v
  • the key members l2 and selectorlevers H are guided adjacent their points of mutilation T6 in slots in "a comb-tame suitably supported-in the mainframe 10.
  • Each of the key members [2" has pivotally articulated thereto [a depending wedge'shapedjmeiiiber 21 (Figsii and 8) adapted to cooperate with 'a series of balls' 28 in such a manner that upon the depression of a key" memoer-"l2 the was member 2-! associated therewith functions to shift'theballs '28 so as to prevent the depression of any of the other key members
  • the displacement of the balls 28 is adjustd by means of an adjusting screw 29.
  • the wedge members 21 and balls 28 are appropriately guided between a pair of guide bars 3
  • a space bar 33 is similarly supported on a pair of arms 34, one of which is associated with a selector lever H.
  • 1 cooperate with the coded bottom edges of a series of permutation members or code bars 35.
  • the code bars 36 are adapted to be slidably mounted on cross members 36 and 31 supported on brackets 38 and 39 suitably attached to the base In.
  • the code bars 35 are normally urged rightwardly (as viewed in Fig. 2) by springs 4
  • code bars 35 are provided with leftwardly directed extensions 43 to which one end of spring 4
  • Alternate ones of said code bars 35 are provided with depending portions 45 to which one end of spring 42 is attached, the
  • Each of the code bars 35 is provided with a shouldered portion 41 which cooperates with a bail member 48 mounted pivotally on pivot studs 49 and carried in a bracket 58 (Fig. 6).
  • Fixed to bail 48 by means of screws 52 (Fig. 6) is a bracket 53, at the outer end of which is'pivotally carried, on pivot 54, a depending lever 55 which is normally urged in a clockwise direction by a spring 56 connected to lever 55 and anchored to bracket 53.
  • the lever '55 is adapted to thrust against a ball bearing member 51 carried on a pivot shaft 58.
  • Lever 55 is also adapted to bear against an adjustable stop screw 59, due to the pull of spring 56.
  • and 42 tend to urge the code bars 35 rightwardly (Fig. 2) tom turn tend. to urge the bail 48 to rotate counterclockwise, but this motion is resisted by the lever 55 bearing against the ball bearing 51.
  • the adjusting screw 59 is carried on the vertical arm of a lever 6
  • cooperates with a lever 62 pivoted at 63 (Fig. 6).
  • Lever 62 is normally biased counterclockwise by a spring 64.
  • lever 62 is provided with a shoulder 65 (Fig. 6)
  • Bail 69 normally tends to rotate clockwise about a pair of pivot studs 1
  • Each selector lever I1 is provided adjacent its left end (Fig. 6) with a projection 13 which cooperates with the upper flange of the bail 69, so
  • a universal bar 11 (Fig. 11) which is also provided with a spring 4
  • the clutch release lever 19 is associated with a clutch, indicated generally as 88, of the type disclosed in copending application Serial No. 707,176, filed November .1, 1946, by A. N. Nilson et al., now U. S. Patent No. 2,568,249 of September 18, 1951.
  • Clutch is of the single revolution type, and is normally locked against rotation by the release lever 19 which is normally biased clockwise (as viewed in Fig. 11) by a spring 8
  • Fixed to shaft I2 (Fig. 1) is the driving portion of clutch 8
  • the universal bar 11 when the universal bar 11 is actuated rightwardly in response to a key operation, its projection 18 will act through a laterally directed flange 83 of release lever 19 to actuate the clutch release lever 19 counterclockwise about its pivot 84 against the tension of spring 8
  • the clutch'release lever 19 is comparable to lever 52 in the copending application. However, in the present embodiment the lever 19 is mechanically controlled, while in said copending application the corresponding lever 52 is electromagnetically controlled.
  • an eccentric drive mechanism for resetting the bail 48 and the code bars 35 (including the universal bar 11);
  • Aflixed to the bail 48 is a bent plate 81 having a slot '88 engageable by an arm '89 integral with a plate 9
  • ] and 92 is effected by inserting a screw driverin the slots 99 or I08, 'depending upon which-direction adjustment is to be made, and by turningsaid screw driver to achieve ,the desired adjustment.
  • aeoasle plate GI "leftw'ardly ⁇ as 'vi'ewedfin Fig; 2) to in "turn, "through plate “01, rotate the bail d clockwise-, thereby causing thelever '55, through spring -56-,-t'o rest ag'a-in uponthe bearing 51 and causing the lever to assume the position'in Fig-2, preparatory to response to a further actujatioh of a keymemb'er-I-Z.
  • a bell crank lever 86 (Fig. 3) is mounted on a pivot 91 carried in the bracket '50. and is provided with a horizontal "arm 98 adapted to cooperate with the lever 02.
  • Pivotally"carrie'd'atthe extremity of the depending arm of bell crank lever siii's a latch member 99. has a vertical projection IOI which'cooper-ates .with a stop pin I02 fixed to the bracket 50.
  • the bellcrank lever 96 and latch .09 normally assume the dottedline position shown in Fig. 3 under thepull of spring I03, wherein-the latchmemher-99 is unlatched from the extension I04 of bail ,48, and the projectionIDI is abutting the stop I02.
  • ls'i'x' o'fthe code bars are employed'for making permutation code selections according to the well known Baudot code. If desired, a '5 unit or 'other code may be employed. In the embodiment shown, eight of the code bars 35 are aljlotte'dfto the transmission or a si'X- u'nit code,
  • Each of the code bars 35 is also provided on its upper edge with a shoulder I06 which cooperates with the lower arm of a lever I01.
  • Levers I01 are mounted pivotally on a suitably supported pivot rod I08, and are normally biased counterclockwise by individual springs I09.
  • Levers I0! are guided' by the upper and lower notched flanges of the comb member III.
  • each lever I07 Pivotally articulated to the upper arm-0 f each of the levers I07, and also guided in the -u pper flange of the comb member-I I I, is air-interponent member IIO.
  • Each lever I01 and itsas's'oci-ated interponent III! are maintainedin cooperative relationship by an individual spring II'3, which also normally biases the associated interponent H0 in a clockwise direction.
  • Each interponent H0 is provided with'a cam follower portion I-I' l adapted to cooperate with an individual cam M5.
  • Each interponent I I0 is also provided with a pair of marking and spacing abutments I I6 and II], respectively, adapted to cooperate under predetermined conditions with depending flanges 'or abutment-s H8 and H9, respectively, of a'rocker member I2I, mounted pivotally on a pivot shaft
  • cam projections on the cams II'5' are arranged helically, in well known mannerfso that upon 'rotation of said earns, the interponents -I I0 will'be oscillated sequentially.
  • Bail I25 is provided with a blade I21 which cooperates with the pointed upper extremities I28 of levers I01.
  • the rightward and leftward reciprocating movements of the interponents H is controlled by a limiting stop bar I29, suitably slotted togovern the relative movement between abutments H6 and H1, and the flanges H8 and H9, respectively.
  • Normal counterclockwise bias is imparted to bail I25 by a spring I3I.
  • a lever arm H2 Integral with the rocker member I2I (in the present embodiment) is a lever arm H2 for actuating the contact mechanism indicated generally by the number I32.
  • This contact mechanism I32 is of the type disclosed in the copending application Serial No. 70,730 filed January 13, 1949, by W. J. Zenner, and comprises in the embodiment disclosed herein, a lever arm I33 having a forked extremity I34 adapted to cooperate with a pin I35 carried by the arm H2 of the rocker member I2I. In this manner, the arm H2 is pivotally articulated to the arm I33 of the contact mechanism I32.
  • Arm I33 is pivotally mounted on a pivot I36 carried in a bracket I31 secured by screws I38 to a pedestal I 39 supported on-the base I0.
  • lever arms I42 and I43 pivotally articulated to associated hinge plates I44 and I45, respectively, secured by screws I46 to the pedestal I39.
  • Carried on lever arm I42 is a contact element I41 which cooperates with a contact element I48'fixed to the bracket I31.
  • a contact I49 which cooperates with a contact element II fixed to the bracket I31.
  • the contacts I49I5I function as marking contacts
  • the contacts I41I48 function as. spacing contacts.
  • positive or marking battery is applied to contact I5I, and the terminal I52 is connected to the signal line.
  • the code bar 35I which controls the start signal, is invariably actuated rightwardly upon each key operation, due to the absence of wards 16, to close contacts .I41-I48.
  • a pin I53 cooperable with a limiting stop member I54 to control the rocking motion of member I2I (Fig. 5).
  • a member I55 having a depending extremity I56.
  • An overcentering member I51 is provided at one end with a tongue I58 adapted to fit loosely in a suitable aperture in the depending extremity I56 by 1 means of which the member I51 is pivotally articulated to the member I55.
  • the member I51 is also provided at its other end with a tongue (not shown) which fits loosely in a suitable aperture in a detent lever I59 mounted pivotally on a pivot IBI.
  • Lever I59 is normally biased counterclockwise (as viewed in Fig. 4) by a spring I62.
  • MemberI51 8 is thus also pivotally articulated to the detent lever I59. With this over-centering arrangement, the rocker member I2I is urged quickly to its clockwise or counterclockwise position and held thereat due to the extension and retraction of spring I62.
  • Interponents H0 will also assume a right or left position according to setting of levers I01 to brin abutments H6 or H1 into alignment with their respective flanges H8 and H9. Then upon continuation of rotation of cam sleeve 82, the cams II5 will oscillate the interponents H0 to, in turn, rock the member I2I to operate the contact mechanism I32 accordingly. At the close of the cycle of rotation of cam sleeve 82 the eccentric drive 9I92 will impart clockwise movement to the bail 48 to thereby restore the code bars 35 to their leftward position, and to restore levers 55 and 62 to their normal rest positions.
  • Fig. 5-A an alternate form of contact arrangement differing somewhat from the contact mechanism I32 (Fig. 2) in principle of operation.
  • the contact levers I42 and I43 cooperate in an overcentering manner with a pair of oppositely disposed V-shaped notches MI in the lever arm I33.
  • a contact assembly for closing one or the other of two contact pairs wherein the movable contact pair carrier will, upon movement, be fulcrumed about the stationary contact point of the pair to be closed, rather than about an external pivot point, to prevent vibration and chattering.
  • the arm or extension H2 of the rocker member I2I is pivotally connected, through the pin I35, to an operating lever I85 which is connected pivotally to the stem of a T-shaped lever I86.
  • Each of the arms of the T-lever I06 is provided on its underside with a contact point I81 which cooperate respectively with fixed contact points I88 carried on brackets I89.
  • the swingable lever I86 is provided with a V-shaped notch I9I which cooperates with an arm of substantially U shaped member I92, the other arm of which cooperates with a V-shaped notch I93 in a bracket I94 mounted on the pedestal I39.
  • a spring'I95 having one end attached to the member I92 has the other end attached to a spring post I96.
  • the spring I95 is, thus,s'o connected that the member I92 will be urged normally in a clockwise direction (Fig. 5-A), urging the contact points I81 toward their associated contact points I88 formed by the upper surface of pins I91. With the notch I9I centrally located, a balanced pressure is exerted with respect to both of the contact points I 81. In actual practice the operating lever I85 will normally be held in such a position that only one contact pair I81--I88 will be'closed-at a time.
  • the operating lever I85 willbe' in one of its two positions, or moving from onetothe other, which causes the -T -lever I86 to be positioned in such amanneras to cause one of the contact points I81 to fulcrum about its associated contact point I88 formed by'the upper surface of the pin I91.
  • the T-lever I86 will be moved from one position to the other, and as the lever I86 is not pivoted about'an external point, it will fulcrum about the contact pair which is desired to be closed. In this-manner bounce and vibrationwill be again eliminated.
  • V 1 I An alternate form of key arrangement is shown in Figs.
  • Key'member I65 are suitably formed, depending on the positions of their respective key' tops I66 in the key bank, to terminate in an alignment to engage the respective lateral portions I61 of select'or' levers I68 mounted pivotally on common pivot' shaft I69 (analogous to'shaft-I i Fig.6)i
  • A'spa'ce bar IN is mounted on a pairof vertical bars I12 pivoted to'bell cranks I13 which are in turn pivotally mounted on a pivot shaft I14.
  • the v'erti cal arm of bell crank I 13 is pivoted to one end of a' link I15, the other end of which is connected pivotally to an arm I16 integral to its particular selector lever I68.
  • Each of the selector levers I68 are provided with an arm I11terminating in a forked end on which is suspended a wedge member I18 (analogous to wedge member 21, Fig. 8),
  • the selector levers Similar to selector levers I1, the selector levers 1.
  • a telegraph transmitter transmitting contacts, contact actuating mechanism therefor comprising a rockable member having a pair of abutments, a signal distributor cam assembly disposed subjacently to said member, a plurality of interponents disposed between said cam assembly and said rockable member, each of said interponents provided with a pair of spaced abutments, respective ones of said abutments on said interponents adapted to coact selectively with its associated abutment on said rocker member, a set of permutation members, instrumentalities associated with said permutation members for con.- trolling the selective positions of said interponents, a bail means for normally restraining selective movement of said permutation members, a series of depressible keys, a corresponding series of selector bars actuated by said keys, said permutation members having coded elements cooperable with said selector bars, means universally controlled by said selector bars, initiating means operably associated with
  • a telegraph transmitter transmitting contacts, contact actua'tingmechanism thereiqr comprising, a rockable member havingfa pair of abutments, a signal distributor cam. assembly disposed subjacently to said member, a plurality of interponents disposed between said cam assembly and said rockable member, each of said interpo-. nents provided with a pair of spaced abutments,
  • a telegraph transmitter transmitting contacts, contact actuating mechanism therefor comprising a rockable member having a pair of abutments, a signal distributor cam assembly disposed subjacently to said member, a plurality of interponents disposed between said cam assembly and said rockable member, each of said interponents provided with a pair of spaced abutments, respective ones of said abutments on said interponents adapted to coact selectively with its associated abutment on said rocker member, a set of permutation members, instrumentalities associated with said permutation members for controlling the selective positions of said interponents, a bail means for normally restraining selective movement of said permutation members, a series of clepressible keys,-a'corresponding series of selector bars actuated by said keys, said permutation members having coded elements co: operable with said selector bars, means universally controlled by said selector bars, means on said universally controlled means effective on conformed extremities of said selector barsfor fixating said selector bars during
  • I l 4 In a telegraph transmitter, transmitting contacts, contact actuating mechanism therefor comprisin'ga rockable member having a pair fofabutmerits, a, signal distributor cam assemblydisposed subjacently to' said member, a plurality of interponents disposed between said cam assemmy and said rockable member, eachof said interponents providedwith a pair of spaced abutments, respective ones of said abutments on said interponents, adapted to coact selectively with its associated abutment on said rocker member, a set of permutation members, instrumentalities associated with said permutation members for controlling theyselectivet positions of said interponents, a first means for normally restraining selective movement of said permutation members, a series of depressiblekeys, a corresponding series of selector bars actuated by said keys, said permutation members having coded elements operable With said selector bars, means universally controlled by said selector bars, initiating means operably associated with said universally controlled means, said
  • a telegraph transmitter transmitting contacts, contact actuating mechanism comprising a rockable member having a pair of abutments, a signal distributor cam assembly disposed subjacently to said member, ,a plurality of 'interponents disposed between said cam assembly and said rockable'member, each of said interponents provided with a pair of spaced abutments, respective ones of said abutments on said interponents adapted to coact selectively with its associated abutment on said rocker member, a set of permutation members, instrumentalities associated with said permutation members for controlling the selective positions of said interponents, a bail means for normally restraining selective movement of said permutation mem-.
  • said permutation members having coded elements 00- operable with said selector bars, means universally controlled by said selector bars, starting means adapted to initiate operationof the transmitter under control of said universally controlled means, said starting means comprising a first release means operated under the control of said universally controlled means and a second release means operated under the control of said first release means, whereby said bail means is released to efiectuate the selective movement of said permutation members under the control of said selector bars to impart through said instrumentalities a corresponding setting to said interponents to enable said cam assembly to operate said rockable member to activate said transmitting contacts according to the setting of said interponents, cam means for subsequently restoring said bail means to normal position, and means controlled by said bail means effective during said operation of restoration to condition said starting means for reoperation.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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US95964A 1949-05-28 1949-05-28 Telegraph keyboard transmitter Expired - Lifetime US2607848A (en)

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US95964A US2607848A (en) 1949-05-28 1949-05-28 Telegraph keyboard transmitter

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069674A (en) * 1959-10-30 1962-12-18 Soroban Engineering Inc Coding keyboard mechanism

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1994949A (en) * 1933-03-23 1935-03-19 Western Union Telegraph Co Telegraph transmitting apparatus
US2274911A (en) * 1941-05-31 1942-03-03 Rca Corp Direct keyboard transmitter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1994949A (en) * 1933-03-23 1935-03-19 Western Union Telegraph Co Telegraph transmitting apparatus
US2274911A (en) * 1941-05-31 1942-03-03 Rca Corp Direct keyboard transmitter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069674A (en) * 1959-10-30 1962-12-18 Soroban Engineering Inc Coding keyboard mechanism

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