US3171890A - Printing telegraph keyboard - Google Patents

Printing telegraph keyboard Download PDF

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Publication number
US3171890A
US3171890A US159324A US15932461A US3171890A US 3171890 A US3171890 A US 3171890A US 159324 A US159324 A US 159324A US 15932461 A US15932461 A US 15932461A US 3171890 A US3171890 A US 3171890A
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Prior art keywords
code
bar
code bars
pair
levers
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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
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US159324A
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English (en)
Inventor
Jr Louis C Anderson
Arthur A Hagstrom
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AT&T Teletype Corp
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Teletype Corp
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Filing date
Publication date
Priority to NL286299D priority Critical patent/NL286299A/xx
Priority to BE626113D priority patent/BE626113A/xx
Application filed by Teletype Corp filed Critical Teletype Corp
Priority to US159324A priority patent/US3171890A/en
Priority to GB45727/62A priority patent/GB1021023A/en
Priority to SE13396/62A priority patent/SE304041B/xx
Priority to CH1472662A priority patent/CH380190A/fr
Priority to DET23206A priority patent/DE1187667B/de
Priority to FR918724A priority patent/FR1345299A/fr
Application granted granted Critical
Publication of US3171890A publication Critical patent/US3171890A/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
    • H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
    • H04L13/16—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00 of transmitters, e.g. code-bars, code-discs
    • 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

Definitions

  • This invention relates to printing telegraph keyboards and more particularly to keyboards for permutatively actuating contacts to control the generation of telegraph code signals.
  • Another object of this invention is to provide a keyboard mechanism for printing telegraph apparatus which uses a minimum number of differently shaped parts thereby to make manufacture of the parts as economical as possible.
  • Still another object of the invention is to provide a keyboard assemblage for mounting on the framework of a telegraph printer which comprises a plurality of sheet metal and molded plastic parts all of which may be assembled as a unit without the use of any tools and then bolted to the framework of a telegraph apparatus.
  • a feature of the invention is the provision of a keyboard assemblage formed of a plurality of sheet metal parts which may be punched from sheet metal stock and assembled with plastic molded parts to form a contact operating arrangement assembled completely without the use of tools.
  • Another feature of the invention is the provision of molded plastic T-levers so formed that they serve as pivotal supports for a plurality of pairs of code bars and also serve to position and guide the code bars during the selective operation of the code bar pairs.
  • a keyboard assemblage which may be assembled without the use of tools, screws, rivets, or welding operations and which comprises a sheet metal box-like structure formed from a single sheet to provide a bottom portion and two side portions of key and code b'ar guiding and supporting assemblage.
  • the upwardly bent sides of this box-like structure have slots formed in them for receiving a plurality of key members and for guiding the key members in rectilinear paths for cooperation with a series of code bars that are disposed transversely of the key members which are movable in the slots.
  • Alternate ones of the slots extend to the upper end of the sides of the box-like structure and are open-ended while the other slots are in the form of perforations or closed-ended slots to facilitate the assembling of the apparatus.
  • the key members are rectilinearly urged to their unoperated positions by leaf springs individual to them.
  • the springs are formed from a single sheet of spring steel that is held on the bottom of the box-like structure by the tension exerted on the sheet of spring material by tabs punched and formed from the bottom of the sheet metal box-like structure.
  • Pivot rods have molded T-ievers freely oscillatable on them and the rods are snapped into the sides of the box-like structure and support the T-levers for free oscillation to coordinate the operation of pairs of code bars pivotally attached to the T-levers.
  • the code bars are held in place with respect to the T-levers solely by slots in the base of the box-like structure and by integrally formed portions of the T-levers are also connected by tie bars pivoted on them.
  • the T- levers and code bars with their associated tie rods are formed from sheet metal stock and are interconnected by the T-levers in such manner that when one code bar of a pair is depressed, due to the codecut int'o,it,by an actuate'd key member, the other code bar of the pair will rise and the T-lever w'ill either open a contact associated with it or will permit the contact to close.
  • the sides of the box-like structure also serve to support, with a snap-fit, a universal code bar and other keys and is also formed to provide supporting lugs which may be attached to a casting or molded part forming the main base of the printer.
  • a contact assemblage aligned with the .T-llevers for operation thereby, is also attached to thesides of the box-like structure with a snap-fit whereby the entire assemblage prior to beingmounted in the keyboard framework of a printing telegraph printer is assembled completely Without the use of any tools.
  • FIG. 1 is a perspective view of a printing telegraph apparatus having a keyboard assemblage, constructed in accordance with the present invention, mounted in it;
  • FIG. 2 is a front elevational view of the keyboard assemblage parts being broken awayto illustrate more clearly those parts in back of the broken away portionsj
  • FIG. 3 is a fragmentary detail view, somewhat similar to a portion of FIG. 2, showing the code bars in a different position than that shown in FIG. 1;
  • FIG. 4 is a fragmentary detail view, in perspective, looking upwardly at the bottom of the box-like structure and illustrating the manner in which the contact assemblage and the leaf springs are mounted on the box-like structure;
  • FIG. 5 is a detail view, in section, through a portion of the box-like structure illustrating the manner in which the restoring springs are mounted on the bottom of the box-like structure;
  • FIG. 6 is a fragmentary perspective view, on a greatly enlarged scale, of one end of a pair of code bars and a tie bar and showing the manner in which the code bars and tie bars are connected together by the T-lever and Show ing details of construction of the T-lever;
  • FIG. 7 is an end view of the apparatus shown in FIG. 2, looking in the direction of the arrows along the line 7-'7;
  • FIG. 8 is a transverse sectional view through the assemblage taken along the line 8--8 of FIG. 1 in the direction of the arrows;
  • FIG. 9 is a fragmentary vertical sectional view taken substantially along the line 99 of FIG. 7 in the direction of the arrows showing the mechanism whereby the keys initiate a cycle of operation of the printer, and
  • FIG. 10 is a fragmentary plan sectional View taken substantially along the line 1010 of FIG. 9 in the direction of the arrows. q
  • a keyboard 11 is provided that is designed for utilization primarily in a printing telegraph page printer which includes, in addition to the keyboard 11, a main casting 12 on which there is mounted a dis tributor 13 which may be of any suitable type hutwhich preferably is of the type described in detail andclair'ned in the copending application of K. Alonas, A. Hagstrom and B. J. Sobczak, Serial No. 159,328 filed December 14, 1961, the disclosure of which is incorporated herein by reference insofar as is necessary for an understanding of this invention. 7
  • the keyboard 11 may be used simply as a transmitter controlling keyboard, but as pointed out hereinbefore it is primarily designed for use with the page printer illustrated in FIG. 1 which includes a platen assemblage 14 for cooperation with a type wheel assemblage 15 that may be operated under control of signals generated by the distributor 13 to print a home record of any message transmitted by the distributor 13 under control of the keyboard 11.
  • FIG. 1 The specific type of page printer shown in FIG. 1 is disclosed in detail and is claimed in the copending application of W. J. Zenner, Serial No. 159,330 filed December 14, 1961 the disclosure of which is incorporated herein by reference insofar as is necessary for an understanding of this invention.
  • a plurality of character keys 16 having molded plastic keytops 17 attached to key stems 18 which are formed integrally with crossmembers 19 and with depending portions 20.
  • the key members 16 comprised of the stem 18, cross-member 19 and depending portion 20 may be punched from sheet metal stock and the keytop 17 may be assembled on the stem 18, as illustrated in FIG. 8, by simply forcing it downwardly onto the stem 18.
  • the stem 18 at its upper end is provided with a pair of oppositely disposed top locking projections 21 and is reduced in width to provide shoulders 22, whereby when a keytop 17, having a stem receiving slot 23 in it, is forced onto the stem 18, it will be held in place thereon by tension.
  • the slot 23 is made slightly smaller than the reduced upper end of the stem 18 whereby when the keytop 17 is forced onto the stem 18, it will be held in place thereon by the cold flow, of the keytop 17 back to its normal size after having been expanded to force it over the projections 21.
  • the cross-member 19, as viewed particularly in FIG. 8, is provided with a notch 26 which serves to hold the key member in position in a box-like structure 24 which forms the main supporting framework for the keys during the assembling of the keys 16 with the structure 24.
  • the depending portion 20 of the key is rounded as shown in FIG. 8 to engage a leaf spring 25.
  • the box-like structure 24 as shown most clearly in FIG. 4, comprises a sheet metal blank having a front wall 35, a rear wall 36 and a bottom 37.
  • This box-like structure may be completely formed in two punch press operations, the first of which consists in blanking out the apertures and slots in the blank in one operation and then, in thesecond operation, folding it to the configuration shown in FIG. 4.
  • the blank which ultimately forms the box-like structure 24 has a series of slots 38 with closed ends formed in it and with a plurality of open ended slots 39 also formed in it.
  • the slots 38 and 39 alternate throughout most of the length of the frontand rear walls and 36 in such a manner that a slot 38 in the rear wall will be directly opposite an open ended slot 39 in the front wall and vice versa.
  • mounting holes 40 and 41 are formed in the front and rear walls of the structure 24, for receiving and supporting a pivot rod 42 (FIGS. 2, 3, and 7).
  • a pivot rod 42 FIGS. 2, 3, and 7
  • two irregularly shaped apertures 43 are formed in the front wall 35 which apertures are substantially rectangular in shape, but provided with an inwardly extending projection 44.
  • Mounting apertures ,45 are also formed in the blank at this time, and mounting tabs 46 are sheared from the main body of the blank.
  • Contact block mounting slots 47 are also formed in the front and rear wall portions of the blank at this time as well as spring mounting. slots 48 and keyguiding slots 49 (FIG. 5).
  • a pair of apertures 50 are also formed in theblank in the front and rear walls 35 and 36 for receiving a pivot shaft 51,- the' purpose of which will be explained hereinafter.
  • the base of the box-like structure 24 also has code bar 4 guide apertures 52 (FIG. 4) formed in it in the blanking operation.
  • the blank is bent to form the front and rear walls 35 and 36 upwardly from the base 37 and also to form the tabs 46.
  • the entire supporting and guiding structure for keys, code bars, T-leve-rs and contact block is formed.
  • the box-like structure 24 just described serves to support and guide all of thekeys 16 and this structure 24 may be attached to a base casting or molding designated generally by the numeral 12 by threading machine screws 61 into posts 62 and 63 at the front and rear respectively of the keyboard 11.
  • the key members 16 will all be guided by the box-like structure 24 in cooperation with a top plate 64 of the keyboard 11 which is provided with apertures 65 in which the keytops 17 are slidable.
  • the boxlike structure 24 is mounted on the posts 62 and 63 after all of the mechanisms supported and guided by it have been assembled with it.
  • a series of tabs 66 and 67 are formed on the base 37 by partially shearing the base tobend the tabs 66 and 67 downwardly.
  • the tab 66 it will be noted by reference to FIG. 5, is appreciably longer than the tab 67 and is bent down out of the plane of the base 37 to a greater extent than the tab 67 whereby a sheet of spring material 68 may be attached to the base of the box-like structure.
  • This spring material is biased in such a manner that, if the sheet 68 were not under tension, the middle of it would bebent downwardly and the outer sides of it would be curved slightly upwardly.
  • This sheet of material is slotted alongboth sides to provide the series of individual leaf springs 25 extending outwardly from the main body of the sheet 68.
  • the sheet 68 of spring material may be attached to the base 37 by flexing it and sliding the body portion of it between the tab 66 and the bottom of the base 37 in such a manner that the bases 69 of several of the slots formed in the sheet 68 will pass beyond the downwardly bent tabs 67 thus to hold all of the leaf springs 25 in position Where there will be one of them beneath each of the key guiding slots 49.
  • the individual leaf springs 25 forming a part of the sheet of spring material 68 will be positioned to urge key members 16, later assembled in the box-like structure 24 to their upper position.
  • the pivot rod 42 may be assembled with the box-like structure 24.
  • a plurality of T-levers 70 are assembled on the rod 42 and are held closely adjacent one to another by a pair of snap-fasteners 71 such for example as the well-known Tru-arc fasteners which will snap onto the rod 42.
  • the rod 42 has annular grooves 72 in it, into which the snap-fasteners, for properly positioning the T-levers 70 on the rod 42, may be forced.
  • the ends of the rod 42 are of slightly reduced cross section to form annular shoulders 73 at each end of each of the rods 42 for engagement with the inner surfaces, of the front and rear Walls 35 and 36.
  • a pair of T-levers 70 (FIG. 6), one of which is positioned at each end of the box-like structure 24, serve: to support and guide a pair of code bars and 81 and atie bar 82. All of the T-levers 70 are of exactly thesame construction and each of them is a molded part having a bearing aperture 83 for receiving the pivot rod 42 whereby the T-lever 70 is readily oscillatable about the pivot rod 42.
  • Each T-lever 70 (FIG. 6) has a pair of code bar pivot arms 84 and 85 formed on it, and the code bar pivotarms 84 and 85 have code bar pivots 86 and 87 projecting from them for pivotally supporting the code bar 81 and the code bar 80, respectively.
  • the code bars 80 and 81 have slots 88 and 89 formed therein for engagement with the pivots 86 and 87, respectively.
  • Each T-lever 70 also has a pair of code bar guide arms 90 and 91 with guiding projections 92 and 93 on them for en gagement with the code bars 81 and 81, respectively.
  • the provision of the guiding projections 92, and 93 permits the use of code bars 80 and 81 which need not be smoothly finished on their edges, but may be punch press parts from which edge burrs formed in the blanking of the parts need not be removed.
  • Projections are also formed on the arms 84, 85, 94 and 97 which are similar to the projections 92 and 93 to prevent the rough edges of the code bars 80 and 81 and the tie bar 82 from rubbing on the faces of their respective arms.
  • a tie bar pivot arm 94 having a pivot 95 extending outwardly from it for entrance into a bearing aperture 96 formed adjacent to the end of the tie bar 82.
  • the tie bar 82 after being assembled with the T-lever 70 is held on the pivot 95 by a guide arm 97.
  • the code bar pivot arm 85 has extending from it a pair of guide fingers 98 and 99 which are disposed on opposite sides of a blocking surface 166 on the end of the pivot arm 85. These guide fingers serve to maintain a cont-act spring 161, such as that shown in dotted lines in FIG. 6, in operative association with the blocking surface 180.
  • a tie bar 82 is interconnected with each pair of T-levers 70, in the same manner illustrated in FIG. 6, prior to mounting the pivot rods 42 in the box-like structure 24 and after the pivot rods 42 with the pairs of T-levers 79 on them have been positioned in the structure 24, a pair of code bars 30 and 81 are connected to the T-levers 70 by first slipping the right end (FIGS.
  • a universal bail 108 having bearing apertures 1139 may be flexed and snapped into position on the inwardly extending projections 44 which project into the substantially rectangular apertures 43 formed adjacent to the ends of the front wall 45.
  • This universal bail 108 extends transversely of all of the key cross-members 19 for actuation thereby and as shown in FIGS. 7, 9 and has a forwardly extending lip 110, which is operative upon the actuation of any key, to actuate a trip lever 111 oscillatably mounted on the pivot rod 42.
  • This trip lever 111 has a projection 112 formed on it for engagement with a bent-over portion 113 of an intermediate lever 114 that is urged, by a contractile spring 115, to move downwardly and to oscillate in a counterclockwise direction (FIG. 9) about the pivot rod 42.
  • the bent-over portion 113 of the intermediate lever 114 lies in the path of movement of the projection 112 on the trip lever 111 and extends across the edge of a blocking lever 116, so that, when the trip lever 111 is rocked clockwise (FIG. 9), it will rock the intermediate lever 114 clockwise and the intermediate lever 114 will rock the blocking lever 116 clockwise against the action of a spring 117 attached to the blocking lever 116.
  • the contractile springs 115 and 117 in the normal unoperated position of the universal bail 110, will hold the blocking lever-116 and the intermediate lever 114 in the position 6 shown in FIG. 9 where the lower end of the blocking lever 116 will lie in the path of a clutch trip lever 118 and will prevent the clutch trip lever from rocking clockwise (FIG. 9), about its pivot shaft 119 under the influence of a spring 120.
  • the trip lever 111 is biased in a counterclockwise direction (FIG. 9) by a spring 126 and has an arm 127 on it which urges the universal bail 108 to the position shown in FIG. 9.
  • the clutch trip lever 118 (FIG.
  • each of the T-levers is provided with a locking arm 128 movable across the path of the trip lever 118 and when the T-levers have been set in their selected positions under control of the keys 16 of the keyboard and the code bars and 81, they will be locked in those positions by the trip lever 118 when it rocks clockwise (FIG. 7).
  • the distributor 13 (FIG. 1), is provided with a stop segment 122, a start segment 123 and six code segments 124 for controlling the transmission of a six-unit code in the manner commonly used for a sixth level shift modification of the well-known Baudot code.
  • the trip link 121 will be drawn to the right (FIG. 7) after having been moved to the left to trip the clutch and in being restored to its righthand position just slightly beyond the position shown in FIG. 7, it will reset the entire mechanism for another cycle of operation by sliding the left end (FIG. 7), of the lever 118 down past the end of the blocking lever 116 whose spring 117 will move the blocking lever back to the blocking position shown in FIG. 9.
  • the clutch not shown, it will supply power to drive a distributor shaft 131 through a single cycle of rotation thereby to rotate a distributor arm 132 mounted on the shaft 131 through one cycle rotation. This will cause the distributor 13 to transmit pulses representative of a permutation code out onto a signal line, (not shown), or to a selector mechanism (also not shown), for controlling the operation of the type wheel assemblage 15.
  • the permutation code signals transmitted by the distributor 13 are selectively controlled by a plurality of contact springs 101 mounted in a contact block 133 which has been forced into the contact block mounting slots 4'7.
  • the contact block mounting slots 4'7 have proturberances 134 formed on them so that when a block 133 is forced into the slots 47, it will be gripped and held firmly in the slots.
  • the contact springs 101 are urging to engage common contact bar 135 by coiled springs 136 (FIG. 3) individual to them and will be blocked from engagement with the common contact bar 135 by the surfaces of the T-levers 70 which have been rocked to the position shown in FIG.
  • the common contact bar 135 is interconnected through a wire in a cable 138 to a power source (not shown).
  • the contact springs 101 are connected through wiring in the cable 138 to the code segments 124 of the distributor 13 and when any of the contact springs 101 are permitted by their associated T-levers 70, to engage the common contact bar 135 they will connect the power source through brushes on the distributor arm 132 to a common contact ring 137 which is in turn connected to the signal line and to the selector mechanism (not shown).
  • the clutch trip lever 118 will be released and will rock clockwise (FIG. 7) to permit a contact bail link 139 (FIG. 9) to move upwardly under the influence of its actuating spring 140.
  • the link 139 has a Shoulder 141 formed on it which, upon release of link 139 by the tripping of the clutch trip lever 118, will limit the upward movement of the link 139 by engaging the underside of the base'37 of the box-like structure 24.
  • the lower end of the link 139 is slidable in a slot 142 formed in the base 37 and is pivotally attached at its upper end to an arm 143 of a contact spring blocking bail 144.
  • the blocking bail 144 has pivot studs 145 formed on its which enter into the apertures 50 in the front and rear walls and 36 of the structure 24 whereby the bail 144 is pivotally mounted in the structure 24.
  • the bail 144 is provided with a contact spring engaging portion 146 that extends transversely of all of the contactsprings 101 and when the apparatus is in the condition illustrated in FIG. 9, this contact spring engaging portion 146 will hold all of'the contact springs 101 out'of contact with the common contact bar 135.
  • the clutch trip link 121 will be moved to the right (FIG. 7) and will restore the link 139 to the position shown in FIG. 9.
  • the link 139 will be released and will permit the spring 140 to move it upwardly (FIG. 9) to move the portion 146 of the bail 144 in a clockwise direction (FIG. 9) to release the contact springs 101 for selective engagement with the common contact bar 135.
  • the keyboard 11 is provided with a repeat key'155 having shift keys 156 (FIG. 2) which do not affect the signal transmission in the same manner as the remainder of the keys in the keyboard and consequently, these keys 155 and 156 are. of slightly different construction than the other keys in the keyboard but they are guided for reciprocation in the same manner as the remaining keys in the keyboard and may be assembled in a manner similar to the keys which control transmission.
  • the space key or bar 157 which instead of having a round keytop on it has an elongated keytop 158 that isslidable in an elongated aperture 159 in the topplate 64.
  • the space key 158 has a stem 160 that is slidably mounted in a tab 161 formed out of the front wall 35 of the box-like structure 24 which is provided with a suitable slot for the reception of the lower end of the stem 160.
  • a crossbar 162 is connected to the stem 160 and extends across the keyboard to a pair of cross-members 163 (see FIG.
  • each of these cross-members 163 may actuate a code bar arrangement of code bars 80-81 to selectively set T-leve-rs for controlling the contact springs 101 totransmit a space signal.
  • the space key or bar 157 is assembled with its cross-bar 162 and its crossmembers 163 by flexing the cross-bar and cross-member to snap them together and to attach them to the shank or stem 160 of the key. Unlike the character keys :16, the space bar 157 is urged to its unoperated position'by coiled springs 166 surrounding shanks 167 extending downwardly (FIG. 9), from the cross-members 163.
  • the repeat key 155 is also provided with a coiled return spring 168 and as shown in FIG. 9, has pivotally mounted on it, a repeat lever 169 for cooperation with the blocking lever 1 16.
  • This repeat lever forms a part of a nonrepeat, repeat tripping mechanism which is described and claimed in the copending application of A. A. 'Hagstrorn Serial No. 159,240 filed December 14,
  • a telegraph keyboard mechanism a plurality of keys movable rectilinearly, a set of pairs of permutation code bars, each having coded notches and projections thereon, cross-members on said keys extending transversely of.
  • a code bar support framework having a bottom and front and rear walls, alternate guide perforati-ons and guide slots formed in said front and rear walls of said framework for receiving and guiding the ends of the cross-members of said keys, a pair of pivot rods positioned in said framework adjacent to the ends thereof and extending in a direction transverse to the length of said code bars, a contact block having a plurality of contact springs mounted on it, said front and rear walls of the framework also being provided with pivot rod apertures and with contact block slots which have surfaces for supporting and locating the pivot rods and contact block in said framework, a plurality of T-levers oscillatably mounted on said pivot rods in alignment with the contact springs on the contact block, and a tie bar associated with each pair of'code bars, said T-levers being formed to interconnect the code bars of a pair of code bars and the tie bar and to maintain the code bars and tie bar in predetermined relationshipone
  • a telegraph keyboard mechanism a plurality of keys movable rectilinearly, a set of pairs of permutation code bars each having coded notches and projections thereon, cross-members on said keys extending transversely of the length of the said code bars for cooperation with said projections and notches to selectively actuate said code bars, a code bar support framework having a bottom, and front and rear walls, alternate guide perforations and guide slots formed in said front and rear walls of said framework for receiving and guiding the ends of the cross-members of said keys, a pair of pivot rods positioned in said framework adjacent to the ends thereof and extending in a direction transverse to the length of said code bars, said front and rear walls of the framework also being provided with pivot rod apertures which have su faces for supporting and locating the pivot rods in said framework, a contact block having a plurality of contact springs mounted on it supported by said framework, a plurality of T-levers oscillatably mounted on said pivot rods in alignment with the contact spring
  • a telegraph keyboard mechanism a plurality of keys movable rectilinearly, a set of pairs of permutation code bars each having coded notches and projections thereon, cross-members on said keys extending transversely of the length of the said code bars for cooperation with said projections and notches to selectively actuate said code bars, a code bar support framework having a bottom and front and rear walls formed from a single sheet of sheet metal, alternate guide perforations and guide slots formed in said front and rear Walls of said framework for receiving and guiding the ends of the cross-members of said keys, a pair of pivot rods positioned in said framework adjacent to the ends thereof and extending in a direction transverse to the length of said code bars, said front and rear walls of the framework also being provided with pivot rod apertures which have surfaces for supporting and locating the pivot rods in said framework, a contact block having a plurality of contact springs mounted on it and frictionally held on said framework, a pair of T-levers individual to each pair of code bars and
  • a telegraph keyboard mechanism a plurality of keys movable rectilinearly, a set of pairs of permutation code bars each having coded notches and projections thereon, cross-members on said keys extending transversely of the length of said code bars for cooperation with said projections and notches to selectively actuate said code bars, a plurality of pairs of T-levers for actuation by said code bars, contact springs positioned in direct engagement with the T-levers to be guided and actuated by said T-levers to electrically set up code combinations for transmission, a tie bar associated with each pair of code bars for cooperation with the pair of T-levers associated with each set of code bars for maintaining the code bars of its associated pair in parallelism upon manipulation of the code bars by the keys, a pair of pivot rods for pivotally supporting said T-levers, and a framework for supporting and guiding all of said aforementioned parts consisting of a single sheet of metal cut and bent to provide guiding and supporting surfaces for said parts.
  • a telegraph keyboard mechanism a plurality of keys movable rectilinearly, a set of pairs of permutation code bars each having code notches and projections thereon, cross-members on said keys extending transversely of the length of said code bar for cooperation with said projections and notches selectively to actuate said code bars, a plurality of pairs of T-levers for actuation by said code bars, contact springs positioned to be actuated by said T-levers, a tie bar associated with each pair of code bars for cooperation with the pair of T-levers associated with each set of code bars for maintaining the code bars of its associated pair in parallelism upon manipulation of the code bars by the keys, a pair of rods for pivotally supporting the pairs of T-levers, and a framework for supporting and guiding all of the abovementioned parts, said T-levers on both rods each consisting of a single molded member of insulating material for direct engagement With the contact springs.
  • T-levers each comprises a bearing portion for rotatably supporting it on its pivot rods, a contact actuating extension for cooperation with one of the contact springs, a tie bar pivot stud for connection to its ti bar, code bar pivot studs for connection to its code bars, and guide portions for guiding the contact spring, tie bar, and code bars and maintaining them in proper relation one to another.
  • T-lever has spaced guide surfaces for engaging opposite sides of each code bar and tie bar connected to it for guiding them.
  • a telegraph keyboard mechanism a plurality of keys movable rectilinearly, a set of pairs of permutation code bars each having coded notches and projections thereon, cross-members on said keys extending transversely of the length of said code bars, for selective actuation by the coded projections on the code bars, a code bar supporting framework having a bottom and front and rear walls, alternate guide perforations and guide slots formed at the front and rear walls or" said framework for receiving and guiding the cross-member of said keys, a pair of pivot rods positioned in said framework adjacent to the ends thereof and extending in a direction transverse to the length of said code bars, a contact block having a plurality of contact springs mounted on it, said front and rear walls of the framework also being provided with pivot rod apertures and with contact block slots which have surfaces for supporting and locating the pivot rod and contact block, respectively, a plurality of T-levers oscillatably mounted on said pivot rods for guiding and actuating the contact springs on the contact

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Push-Button Switches (AREA)
US159324A 1961-12-14 1961-12-14 Printing telegraph keyboard Expired - Lifetime US3171890A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
NL286299D NL286299A (es) 1961-12-14
BE626113D BE626113A (es) 1961-12-14
US159324A US3171890A (en) 1961-12-14 1961-12-14 Printing telegraph keyboard
GB45727/62A GB1021023A (en) 1961-12-14 1962-12-04 Printing telegraph keyboard
SE13396/62A SE304041B (es) 1961-12-14 1962-12-12
CH1472662A CH380190A (fr) 1961-12-14 1962-12-14 Clavier pour appareil de transmission télégraphique
DET23206A DE1187667B (de) 1961-12-14 1962-12-14 Tastenwerk fuer Fernschreiber, dessen Tastenhebel auf paarweise zusammengefasste, elektrische Kontakte betaetigende Waehlschienen einwirken
FR918724A FR1345299A (fr) 1961-12-14 1962-12-14 Clavier de téléscripteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US159324A US3171890A (en) 1961-12-14 1961-12-14 Printing telegraph keyboard

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US3171890A true US3171890A (en) 1965-03-02

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US159324A Expired - Lifetime US3171890A (en) 1961-12-14 1961-12-14 Printing telegraph keyboard

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US (1) US3171890A (es)
BE (1) BE626113A (es)
CH (1) CH380190A (es)
DE (1) DE1187667B (es)
GB (1) GB1021023A (es)
NL (1) NL286299A (es)
SE (1) SE304041B (es)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2266027A (en) * 1940-02-05 1941-12-16 Teletype Corp Permutation keyboard apparatus
US2494232A (en) * 1945-03-13 1950-01-10 Sagem Telegraphic apparatus of the starting-stopping type

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE942640C (de) * 1953-01-23 1956-05-03 Siemens Ag Fernschreibmaschine
DE958201C (de) * 1953-05-03 1957-02-14 Lorenz C Ag Tastenwerk fuer Fernschreibmaschinen od. dgl.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2266027A (en) * 1940-02-05 1941-12-16 Teletype Corp Permutation keyboard apparatus
US2494232A (en) * 1945-03-13 1950-01-10 Sagem Telegraphic apparatus of the starting-stopping type

Also Published As

Publication number Publication date
GB1021023A (en) 1966-02-23
BE626113A (es)
NL286299A (es)
SE304041B (es) 1968-09-16
CH380190A (fr) 1964-07-31
DE1187667B (de) 1965-02-25

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