US2407889A - Automatic telephone dialer - Google Patents

Automatic telephone dialer Download PDF

Info

Publication number
US2407889A
US2407889A US539512A US53951244A US2407889A US 2407889 A US2407889 A US 2407889A US 539512 A US539512 A US 539512A US 53951244 A US53951244 A US 53951244A US 2407889 A US2407889 A US 2407889A
Authority
US
United States
Prior art keywords
keys
key
row
frame
gears
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
US539512A
Other languages
English (en)
Inventor
Thomas W Mackenzie
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US539512A priority Critical patent/US2407889A/en
Priority to CH259265D priority patent/CH259265A/fr
Application granted granted Critical
Publication of US2407889A publication Critical patent/US2407889A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/274—Devices whereby a plurality of signals may be stored simultaneously with provision for storing more than one subscriber number at a time, e.g. using toothed disc

Definitions

  • This invention relates to apparatus for use in automatically making telephone calls for normal interechange uses within the range of a self-calling area, as well as devices or apparatus of this kind adapted for inter-department or house calling systems. More particularly, the invention relates to an apparatus employing a large number of closely and compactly arranged keys divided into two banks or sides, each bank or side operating independent control or call mechanisms, whereas means is employed whereby the opera tion of a key in one bank will automatically lock adjacent keys in said bank and in the opposed bank.
  • Fig. l is a plan view oi an apparatus made according to my invention, with part of the construction broken away and in section. c
  • Fig. 2 is a longitudinal sectional view substantially on the line 2 2 of Fig. 3, with parts of the construction shown in elevation.
  • Fig. 3 is a partial section on the line 3-3 of Fig. 2.
  • Fig. i is a partial section on the line 4-4 of Fig. 2, showing a different key depressed.
  • Fig. 5 is a partial section on the line 5-5 of Fig. 2.
  • Fig. 6' is a partial section on the line 6-6 of Fig. 2, showing only a part of the construction.
  • Fig. '7 is a view similar to Fig. 4, but showing only a part of the construction with parts in a diiierent position.
  • Fig. 8 is a broken detailed section on the line 8-8 of Fig. Li.
  • Fig. 9 is a partial section on the line 9 9 of Fig. 3.
  • the apparatus has been illustrated as a unit independent and apart of telephone receiver and transmitting apparatus, except of course, for the electrical connections which would be made With the conventional apparatus.
  • the casing of the apparatus included the means for supporting the receiver and transmitter as well as the dialing apparatus, whereas in the present structure, the casing is devoted primarily to the mechanism of the dialer, thus materially simplifying the construction of this apparatus and minimizing the size thereof.
  • I represents a casing, preferably having an inclined top wall II formed by a short front wall I2, and a longer back wall I3, as will clearly appear from a consideration of Fig. 2 of the drawings.
  • supplemental end walls I4 and I5 which form the bearings and supports for the various shafts employed, as will clearly appear from a consideration of Figs. 3, 4 and 5 of the drawings.
  • the end walls i4 and I5 are joined by a top plate casting I5, shown in section in Fig. 2 of the drawings, to which is attached side key guide plates I1, which in conjunction with the plate I5 form vertical apertures or key channels I8 for supporting and guiding a plurality of keys I9 and 20.
  • a cover plate 2l Arranged upon the top of the casing I0 is a cover plate 2l which also has apertures therein in registering alinement with the apertures I8.
  • the casting I6 has two longitudinal raised ribs 212, note Fig. ll, which have therein longitudinally spaced and directly opposed bores or passages 23, in which are mounted independent rods 24, inner adjacent ends of which are reduced to receive coil springs at 25.
  • Aarranged balls 26 At the outer ends of the rods are Aarranged balls 26 which normally seat in recesses 21 in the keys I9 land 20 to retain all of the keys in raised position, as indicated at the left of Fig. 4 of the drawings.
  • the ratchets 36 and 3l are secured to the shafts, whereas the gears 34 are free to rotate on the shaft.
  • Pivoted to ⁇ the face of each gear 34 and 35 is a pawl 38 actuated by a spring 3S to support the same in constant engagement with the ratchets 36 and 3l, so that upon depression of one of the keys I9-2Il, its associated elongated gear 3*-3I is rotated to rotate the ratchet 35-31 freely beneath the respective pawls 36, so that, in the spring motor rotation of the elongated gears, the ratchets will operate to rotate the gears 34-35 for operating the circuit maker and breaker mechanism, later described.
  • gears 3S and 3l Arranged inwardly of the gears 3S and 3l are two shafts 4i) and 4I on which are arranged pinions 42 and 43, note Fig. 3, These pinions are in constant mesh with the gears 3-3I, and in the initial rotation or the gears 3ii*3l the pinions are rotated to wind-up elongated coil springs 44 and 45, which springs then serve to rotate the gears 34-35 through the medium or" the ratchets 36*3'I, as previously described.
  • the motors $4 and 45 are formed from. a single wire, the central portion of which is looped around a, stud or screw, as seen at 46 in Fig. 4 of the drawings to anchor one end of each motor.
  • the other ends of these springs or motors 44-45 are keyed to collars 4'! and 46, as seen in Fig. 3 of the drawings, the collars being secured to the shafts 4U and I I.
  • the shafts 4 and 4I prortude through the end wall 42, and adjustabiy secured thereon are stops 49 and 58 which check the iinal rotary movement of the gears 30 and 3l,
  • two longitudinal control or escapement rods i and 52 Arranged outwardly of the gears 3U and 3 l and slightly above these gears, are two longitudinal control or escapement rods i and 52, which are rectangular in cross sectional form throughout the major portion of the length thereof, at least throughout such lengths of the rods as will be exposed to the row or bank of keys I9 and 2e employed. These rods are normally supported with the high-points of the rectangular cross section thereof arranged horizontally, as clearly seen in Fig, 4 of the drawings, by springs 53 secured to blocks 54 mounted on the ends of the rods El and 52, which protrude through the wall I4, as clearly seen in Fig. 6 of the drawings.
  • pinions 56 Adjacent ends of the springs 53 are secured to a common post 55, Secured to the rods adjacent the wall I5 are pinions 56. These pinions 56 are adapted to register with rack faces 51 on levers 5S, pivoted to the wall I5, as seen at 59.
  • the free ends of the levers have pinions 6@ which operate in elongated slots 6I in switch operating rods 62. Also coupled with the pinion 6i] are springs 63 supported on the wall I5, as seen at 64, to normally maintain the levers 58 in perpendicular position. These latter springs also cooperate with the springs 53 to maintain the rods 5I and 52 in their normal position, as seen in Fig. 4.
  • insulators, sleeves or rollers 65 Secured to the switch operating rods 62 are insulators, sleeves or rollers 65 adapted to engage and operate one spring contact 56 to move the same into engagement with an adjacent contact 6l in the manner illustrated in Fig. 7 of the drawings to complete the electric circuit to the telephone apparatus in automatically dialing or transmitting a telphone number by one of the depressed keys of the apparatus, as later described.
  • the spring contacts 66 and 61 are supported in a block of insulating material 68, as is also other spring contacts 69, forming parts of the make and break circuits, and engaged by the make and break element lll, rotated between the contact 69 and associated contacts 1l in providing ythe desired impulses controlling the signal or call transmitted to the telephone system in calling a predetermined number in the upward movement of a depressed key, as more specifically described later.V
  • Each make and break element 10 is mounted on a shaft arranged in the wall I 5, and has at its outer end a pinion l2 which meshes with a gear 'I3-arranged on a stub shaft 'I4 supported in the wall I5. On the shaft 'I4 is a pinion I5 which meshes with the gear 34--35.
  • Inner surfaces of the keys I6 and 2i) have rack teeth which are adapted to mesh with the gears 30 and 3
  • On the outer surfaces of the keys I9 and 20 are arranged longitudinally spaced V-shaped recesses 8
  • the construction of the keys I9 and 2D are generally of the type and kind more speoiiically disclosed in my prior application 432,676, being modified in the present case in the contour of the recesses 8
  • the upper ends of the keys I9 and 2i) have Ilat ringer pieces 83 of the general contour, seen in Fig. 1 of the drawings, by means of which each of the keys may be depressed, and these finger piece endsor heads of the keys are directed inwardly in the manner seen in Fig. 1 of the drawings.
  • Adjustably secured on the shafts 40 and 4I are interfitting key locking elements 84 and 85, each having a recess B6 in the periphery thereof adapted to receive the other element.
  • the element184 will enter the recess 86 of the element 85, and thus key the element 85 against rotation. This will automatically lock all of the keys in the row controlled by the spring motor 45 and gear 3l against operation. The same operation takes place when the element 85 is rotated and enters the recess 86 of the element B4.
  • each row or bank of keys actuates independent mechanisms, one bank and row of keys can be used for an intercommunicating system, whereas the other rowlor bank of keys can be used for other or outside calls by simply constructing the switch devices and the wire accordingly.
  • each key is of the same construction, and thus one standard type of key will be made, this enables the keys to be shifted into dlierent positions at either side ofthe apparatus, or in either row of keys, excepting that the finger piece ends 83 may be directed differently on certain of the keys by reason of the arrangement i'llustrated in Fig. 1 of the drawings.
  • the keys are all of the same structure and the ringer piece ends may be attached in any desired manner, the details of this not being shown in the accompanying drawings. This is desirable from the standpoint of keeping keys which are operated more frequently at convenient positions on the dialer.
  • these keys may be easily guided and supported in the'apparatus and can be economically produced. Still further, the square cross sectional contour oi the operating rods 5I--52 l materialiy simplifies the structure of these elements and apparatus, and if any appreciable wear should appear on the surface engaged by the keys, these rods may simply be turned to ring a new surface or corner into position, thus vfour wearing surfaces are provided.
  • An automatic telephone dialer com ri. ing a frame, means forming two rows of longitudinally spaced key receiving channels at the upper portion of the frame, keys having rack surfaces mounted to move vertically in said channeis, clongated gears in the frame one adjacent each rou1 oi keys and adapted to be operated by any one of the keys in a row, spring motors operatively engaging said gears, two control rods, one arranged longitudinally of each row of keys, said rods being of rectangular cross sectional form, means maintaining said rods in operative engagement with spaced elements on each.
  • An automatic telephone dialer comprising a frame, means forming two rows of longitudinally spaced key receiving channels at the upper portion of the frame, keys having rack surfaces mounted to move vertically in said channels, elongated gearsl in the frame one adjacent each row of keys and adapted to be operated by any one of the keys in a row, spring motors operatively engaging said gears, two control rods, one arranged longitudinally of each row of keys, said l rods being' of rectangular cross sectional form, means maintaining said rods in operative engagement with spaced elements on each of the keys characterizing predetermined telephone numbers, two independent impulse transmitting devices, independent switches controlling circuits to said devices, means in direct operative engagement with each bar for closing and opening the circuit through an associated switch device in controlling automatic transmission of a telephone number by movement of a key relatively to its associated rod, said last named means comprising a switch operating bar, and a lever directly actuated by said rod for moving the bar to close said switch.
  • An automatic telephone dialer comprising a frame, means forming two rows of longitudinally spaced key receiving channels at the upper portion of the frame, keys having rack surfaces mounted to move vertically in said channels, elongated gears in the frame one adjacent each row of keys and adapted to be operated by any one of the keys in a row, spring motors operatively engaging said gears, two control rods, one arranged longitudinally of each row of keys, said rods being of rectangular cross sectional form, means maintaining said rods in operative engagement with spaced elements on each of the keys characterizing predetermined telephone numbers, two independent impulse transmitting devices, independent switches controlling circuits to said devices, means in direct operative engagement with each bar for closing and opening the circuit through an associated switch device in controlling automatic transmission of a telephone number by movement of a key relatively to its associated rod, said last named means comprising aswitch operating bar, a lever directly actuated by said rod for moving the bar to close said switch, and means providing free movement of the lever relatively to the bar in the depression of a key.
  • each row of keys having an independent operable unit controlling transmission of a telephone number in actuation of one of the keys in said rows
  • each unit comprising an elongated gear, means on each key of a row for independently rotating said gear, an elongated control bar arranged longitudinally of the row of keys and operatively engaging characterized elements on said keys, each unit having means transmitting impulses to a telephone circuit and a switch controlling the circuit to said last named means, and each unit having means directly operable by said bar controlling, through the medium of the elements on said keys, the opening and closing of said switch.
  • each row of keys having an independent operable unit controlling transmission of a telephone number in actuation of one of the keys in said rows
  • each unit comprising an elongated gear, means on each key of a row for independently rotating said gear, an elongated control bar arranged longitudinally of the row of keys and operatively engaging characterized elements on said keys, each unit having means transmitting impulses to a telephone circuit and a switch controlling the circuit to said last named means, each unit having means directly operable by said bar controlling, through the medium of the elements on said keys, the opening and closing of said switch, said last named means comprising a lever having a rack surface, a gear on said rod engaging the rack of said lever, and a switch operating bar in operative engagement with said lever.
  • a frame means for supporting a row of call keys longitudinally of the frame, keys arranged in said last named means, each key having on one surface a gear rack and on the other surface spaced elements characterizing a telephone number to be called, an elongated member having means adapted to operatively engage the rack of all of said keys in thedepression of said keys, a spring motor ⁇ operatively engaging said elongated member and wound upon the ⁇ depression of any one of the keys in said row, means transmitting impulses to a telephone circuit, means placing said elongated member when actuated by the spring motor in operative engagement with said last named means, a switch controlling the circuit to said impulse transmitting means, and a single member operatively engaging the spaced elements of all of said keys in controlling said switch.
  • a frame means for supporting a row of call keys longitudinally of the frame, keys arranged in said last named means, each key having on one surface a gear rack and on the other surface spaced elements characterizing a telephone number to be called, an elongated member having means adapted yto operatively engage the rack of all of said keys in the depression of said keys, a, spring motor operatively engaging said elongated member and wound upon the depression of any one of the keys in said row, means transmitting impulses to a telephone circuit, means placing said elongated member when actuated by the spring motor in operative engagement with said last named means, a switch controlling the circuit to said impulse transmitting means, a single member operatively engaging the spaced elements of all of said keys in controlling said switch, said keys having inwardly of the racks and elements thereon recesses, and means in the frame operatively engaging the recesses of said keys to support the same in raised position.
  • an automatic telephone dialer employing a row of keys, with means for supporting said keys for inward and outward movement with respect to the support, means directly operable by one movement of any one of the keys in a row for actuating a motor to move the keys in .the opposite direction, an elongated rod of rec- .tangular cross sectional form arranged longitudinally of and in operative engagement with all of said keys, means spaced longitudinally of the surface of all of said keys arranged adjacent said rod for imparting intermittent rotary movement to said rod in the last mentioned movement of the keys, and means in operative engagement with said rod for opening and closingr an electric circuit in the intermittent rotary operations of said rod.
  • an automatic telephone dialer employing a row of keys, with means for supporting said keys for inward and outward movement with respect to the support, means directly operable by one movement of any one of the keys in a row for actuating a motor to move the keys in the opposite direction, an elongated rod of rectangular cross sectional form arranged longitudinally of and in operative engagement with al1 of said 9 keys, means spaced longitudinally ⁇ of the surface of all of said keys arranged adjacent said rod for imparting intermittent rotary movement to said rod in the last mentioned movement ⁇ of the keys, means in operative engagement with said rod for opening and closing an electric circuit in the intermittent rotary operations of said rod, and means rendering the last named means inoperative in the nrst named movement of the keys with respect to said rod.
  • a spring motor for actuating said iii-st named means, means involving a key for winding said motor, means utilizing said motork to feed the key in one direction in the apparatus, means operatively engaging said key in the last named movement thereof for opening and closingv the circuit through said switch, said last named means comprising a key engaging rod, a switch operating sliding rod, and a lever operatively engaging both rods and movable independently of said sliding rod.
  • an automatic telephone dialer employing a row of keys, with means for supporting said keys for inward and outward movement with respect to the support, means directly operable by one movement of any one of the keys in a row for actuating.r a motor to move the key in the opposite direction, an elongated rod of rectangular cross sectional form arranged longitudinally of and in operative engagement with all of keys, means spaced longitudinally of the surface of all of said keys arranged adjacent said rod for imparting intermittent rotary movement lto said rod in the last mentioned movement of the keys, means in operative engagement with said rod for opening and closing an electric circuit in the intermittent rotary operations of said rod, and tensional means for supporting the last named means and said rod in neutral position.
  • an automatic telephone dialer apparatus the combination with call keys having spaced elements characterizing predetermined telephone numbers arranged at one end portion of said keys, a recess in the keys inwardly oi said elements, of a unit comprising a frame having spaced rows of key supporting channels at opposite sides of said frame, yieldable means at the upper portion of the frame operatively engaging the recess portions of keys arranged in said channels to support said keys in raised position in said frame with all of the elements arranged within boundaries of the frame, and a single member arranged longitudinally of each row of keys in operative relation with the elements of said keys for controlling transmission of predetermined telephone numbers in one movement of said keys relatively to said frame,
  • an automatic telephone dialer apparatus the combination with call keys having spaced elements characterizing predetermined telephone numbers arranged at one end portion of said keys, a recess in the keys inwardly of said elements, of a unit comprising a frame having spaced rows of key supporting channels at opposite sides of said frame, yieldable means at the upper portion of the frame operatively engaging the recess portions of keys arranged in said channels to support said keys in raised position in said frame with all of the elements arranged within boundaries of the frame, a single member arranged longitudinally of each row of keys in operative relation with the elements of said keys for con- 10- trolling transmission of predetermined telephone numbers in one movement of said keys relatively to said frame, said keys each including gear racks on the surface thereof opposed to said elements, and a single gear member arranged longitudinally of each row of keys adapted to be operated by any one oi the keys in a row for putting the apparatus in operation.
  • An apparatus of the class described comprising a unit frame, said frame having a longitudinal gear at each side oi the frame, a rectangular'ro'd adjacent and longitudinally of each gear, coil spring motors inwardly of said gears with means engaging the gears for winding said motors, a row of key supporting and guiding channels arranged above and intermediate said and rods, keys arranged in said channels and movable vertically between and operatively engaging the gears and rods, means supporting each of the keys in raised inoperative position above said gears and rods, each side oi the frame having independent means for transmitting impulses to an electric circuit, gear trains placing said spring motors in operative engagement with the last named means, an independent switch controlling each of the last named means, and means in operative engagement with each rod controllinfr one of said last named switches.
  • An apparatus of the class described comprising a unit frame, said frame having a longitudinal gear at leach side of the frame, a rectangular rod adjacent and longitudinally of each gear, coil spring motors inwardly of said gears withv means engaging the gears for winding said motors, a row of key supporting and guiding channels arranged above and intermediatel said gears and rods, keys arranged in said channels and movable vertically between and operatively engaging the gears and rods, means supporting each ofA the keys in raised ino-perativeposition above said gears and rods, each side of the frame having independent means for transmitting impulses to an electric circuit, gear trains placing said spring motors in operative engagement with the last named means, anl independent switch controlling each of the last named means, means in operative engagement with each rod controlling one of said last named switches, said last named means comprising a rackedy lever'engaging avpinion on said rod, and a switch operating bar actuated by said lever.
  • An apparatus of the class described comprising a unit traine, said frame having a longitudinal gear at each side of the frame, a rectangular rod adjacent and longitudinally of each gear, coil spring motors inwardly of said gears with means engaging the gears for winding .said motors. a row of key supporting and guiding channels arranged above and intermediate said gears and rods, keys arranged in said channels and movable vertically between and operatively engaging the gears and rods, means supporting each of the keys in raised inoperative position above said gears and rods, each side of the frame having independent means for transmitting impulses to an electric circuit.
  • gear trains placing said spring motors in operative engagement with the last named means, an independent switch controlling each of the last named means, means in operative engagement with each rod controlling one of said last named switches, said last named means comprising a racked lever engaging a pinion on said rod. a switch operating bar actuated by said lever, and tensional means for supporting the lever and rod in neutral position.
  • An apparatus of the class described comprising a unit frame, said frame having a longitudinal gear at each side of the frame, a rectanguiar rod adjacent and longitudinally of each gear, coil spring motors inwardly of said gears with means engaging the gears for winding said motors, a row of key supporting and guiding channels arranged above and intermediate said gears and rods, keys arranged in said channels and movable vertically between and operatively engaging the gears and rods, means supporting each of the keys in raised inoperative position above said gears and rods, each side of the frame having independent means for transmitting impulses to an electric circuit, gear trains placing said spring motors in operative engagement withthe last named means, an independentJ switch controlling each of the last naimed means, means in operative engagement with each rod controlling one of said last named switches, said last named means comprising a racked lever engaging a pinion on said rod, a switch operating bar actuated by said lever, and tensional means for supporting the lever and rod in neutral position and in operative engagement with the elements of said
  • a key actuated telephone number calling device employing two rows of call keys, a frame in which said keys are vertically movable, means in the frame supporting all of the keys in raised position, independent number transmitting units, one unit controlling one row of keys and another unit controlling another row of keys, each unit comprising means -transmitting impulses to a telephone circuit in transmitting a predetermined telephone number, a switch controlling the circuit to said last named means, and a single switch operating element operatively engaging all of the keys alined in a row and actuated by each depressed key in upward movement of said key in controlling movement of said switch into operative and inoperative positions in calling a number.
  • a key actuated telephone number calling device employing two rows of call keys, a frame i in which said keys are vertically movable, means in the frame supporting all of the keys in raised position, independent number transmitting units, one unit controlling one row of keys and another unit controlling another row of keys, each unit comprising means transmitting impulses to a telephone circuit in transmitting a predetermined telephone number, a switch controlling the circuit to said last named means, a single switch operating element operatively engaging all of the keys alined in a row and actuated by each depressed key in upward movement of said key in controlling movement of said switch into operative and inoperative positions in calling a number, all oi said keys having gear rack surfaces, and means operated by the gear rack surface of any one of the keys in said row for putting the second named means in operation.
  • a key actuated telephone number calling device employing two rows of call keys, a frame in which said keys are vertically movable, means in the frame supporting all of the keys in raised position, independent number transmitting units, one unit controlling one row of keys and another unit controlling another row of keys, each unit comprising means transmitting impulses to a telephone circuit in transmitting a predetermined telephone number, a switch controlling the circuit to said last named means, a single switch operating element operatively engaging all of the keys alined in a row and actuated by each depressed key in upward movement of said key in controlling movement of said switch into operative and inoperative positions in calling a number, and tensional means for supporting the switch operating element in constant engagement with a key in the upward movement of said key.
  • a key actuated telephone dialer means for supporting a plurality of keys in predetermined alinement in a casing with adjacent keys in close proximity to each other, said keys having recessed portions centrally thereof, means engaging all of the keys to maintain the same in predetermined inoperative position, said last named means comprising spring pressed balls engaging the recessed portions of said keys, means whereby in the operation of one of the keys adjacent keys will be automatically retained against operation, means for returning the keys to normal inoperative position, and said spring pressed balls in cooperation with the recessed portions of the keys serving to move said keys and hold the same in their iinal inoperative position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
US539512A 1942-02-27 1944-06-09 Automatic telephone dialer Expired - Lifetime US2407889A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US539512A US2407889A (en) 1942-02-27 1944-06-09 Automatic telephone dialer
CH259265D CH259265A (fr) 1942-02-27 1945-12-28 Appareil à touches pour appeler des numéros d'abonnés téléphoniques prédéterminés.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US259265XA 1942-02-27 1942-02-27
US539512A US2407889A (en) 1942-02-27 1944-06-09 Automatic telephone dialer

Publications (1)

Publication Number Publication Date
US2407889A true US2407889A (en) 1946-09-17

Family

ID=26700474

Family Applications (1)

Application Number Title Priority Date Filing Date
US539512A Expired - Lifetime US2407889A (en) 1942-02-27 1944-06-09 Automatic telephone dialer

Country Status (2)

Country Link
US (1) US2407889A (fr)
CH (1) CH259265A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2660621A (en) * 1950-07-14 1953-11-24 Louis L Billar Identification code on sound records
US2767252A (en) * 1952-09-04 1956-10-16 Deutsche Telephonwerk Kabel Impulse sender for telephone systems with dial service
US3614331A (en) * 1968-09-30 1971-10-19 Mkh Inc Keyboard pulse generator including a locking plate for use in telephone dialing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2660621A (en) * 1950-07-14 1953-11-24 Louis L Billar Identification code on sound records
US2767252A (en) * 1952-09-04 1956-10-16 Deutsche Telephonwerk Kabel Impulse sender for telephone systems with dial service
US3614331A (en) * 1968-09-30 1971-10-19 Mkh Inc Keyboard pulse generator including a locking plate for use in telephone dialing

Also Published As

Publication number Publication date
CH259265A (fr) 1949-01-15

Similar Documents

Publication Publication Date Title
GB1247178A (en) Improvements in or relating to automatic current-pulse emitters for telephony or like installations
US2407889A (en) Automatic telephone dialer
US2579983A (en) Apparatus for operating automatic telephones
US2099913A (en) Automatic telephone signaling apparatus
US4186279A (en) Stored program telephone dialer
US2398019A (en) Call key for automatic telephone dialers
US3751594A (en) Telephone alarm
US3125643A (en) Solenoid
US2348758A (en) Automatic telephone calling system
US6130946A (en) Cryptographs
US3125289A (en) o-o o-o o-o
US3366747A (en) Selector for impulse sender
US3286040A (en) Call transmitter employing a code bearing medium
US3127098A (en) N brewer
US2391911A (en) Automatic telephone dialer
US3511938A (en) Impulse transmitter for telephone and telewriter installations
US2999133A (en) Tape advancer for automatic telephone dialer
US2798119A (en) Cross-bar type, impulse responsive, telephone switching apparatus
US3681535A (en) Settable automatic call repertory device with control of dial, pushbuttons and data memories
US681951A (en) System of electrical intercommunication.
US3209077A (en) Automatic telephone dialer
US3188002A (en) Write-in for voting machines
US1079467A (en) Search-call apparatus.
US2301908A (en) Remote control device for automatic phonographs
US2033507A (en) Automatic telephone signal transmitting method and device