US2068700A - Calling device - Google Patents

Calling device Download PDF

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Publication number
US2068700A
US2068700A US30799A US3079935A US2068700A US 2068700 A US2068700 A US 2068700A US 30799 A US30799 A US 30799A US 3079935 A US3079935 A US 3079935A US 2068700 A US2068700 A US 2068700A
Authority
US
United States
Prior art keywords
pawl
ratchet
spring
dial
calling device
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
US30799A
Other languages
English (en)
Inventor
Peterson Seth
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.)
Associated Electric Laboratories Inc
Original Assignee
Associated Electric Laboratories Inc
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
Priority to BE416209D priority Critical patent/BE416209A/xx
Application filed by Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Priority to US30799A priority patent/US2068700A/en
Application granted granted Critical
Publication of US2068700A publication Critical patent/US2068700A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/12—Freewheels or freewheel clutches with hinged pawl co-operating with teeth, cogs, or the like
    • 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
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1526—Oscillation or reciprocation to intermittent unidirectional motion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2133—Pawls and ratchets
    • Y10T74/2135—Noiseless

Definitions

  • the present invention relates in general to calling devices, such as are used in automatic telephone systems, and the object of the invention is to reduce the noise produced by the operation of.a calling device of this character.
  • a calling device which is in wide use is shown in U. S. patent to Obergfell, No. 1,642,822, granted September 20, 1927.
  • This calling device has a finger dial which is variably rotatable in accordance with the different digits. Attached to the dial is a member carrying a pawl, and with the pawl there is associated a ratchet wheel.
  • the pawl When the dial is rotated the pawl is rotated over successive ratchet teeth, the number passed depending on the digit dialled. When the dial is released it is returned by means of a spring at a constant speed controlled by a governor. On the beginning of the return movement the pawl engages the then adjacent ratchet tooth and rotates the ratchet wheel while the dial is returning.
  • the ratchet wheel has an associated, gear wheel which drives the impulse sending mechanism.
  • Fig. l is a front view of a calling device with finger dial removed
  • Fig. 2 is a rear view of part of the mechanism appearing in Fig. 1, showing the ratchet and pawl to better advantage
  • Fig. 3 is a view similar to Fig. 2 and showing a modification of the invention. 7
  • the finger dial (not shown) has a central opening which fits over the slightly raised hub l3 on plate 12, being held 5 in place by a screw threaded in a hole at the center of I3.
  • the member I2 When the dial is in place, there fore, and is rotated in the usual manner, the member I2 will be rotated also, the direction of rotation being clockwise as seen in Fig. l, and 3 counter clockwise as seen in Fig. 2.
  • the ratchet wheel l5 stands still while the member 12 is retated and consequently the pawl is, pivoted on l2 at H, will pass over the teeth of the ratchet wheel.
  • a spring l9 seen best in Fig. 1.
  • One end of this spring is attached to the member 12 in any suitable manner, as by soldering, while the other end is bent over at right angles and is passed through the same hole in pawl 16 that accommodates the hook on the end of spring l8.
  • This spring I9 is so tensioned that it begins to oppose the spring I8 after the pawl has dropped into a ratchet notch a short distance and arrests the further movement of the pawl by the time it has gone about half way into the notch, or at least before it reaches the bottom of the notch.
  • ratchet wheel l5 pawl l6, and spring 18'
  • the pawl 6 is shaped slightly difierent at the pivot end.
  • the pawl i6 is slotted and one end of a flat spring 20 is in- 5 serted under pressure, being thus secured to the pawl.
  • the other end of spring 20 bears against a pin or stud 2i secured to member l2.
  • a calling device having a dial and a ratchet and pawl mechanism operated thereby, means foreliminating noise during operation of the dial, said means comprising a spring adjusted to become effective each time'the pawl passes over a ratchet tooth and prevent the pawl from dropping to the bottom of the notch following such tooth.
  • means for eliminating noise due to the pawl passing over successive ratchet teeth said means comprising a spring which opposes the pawl open ating spring during movement of the pawl in the direction of the ratchet and limits the movement of the pawl.
  • a spring continuously under tension regardless of the position of the pawl and tending to hold it against the ratchet, and a second spring which is under tension only after the pawl has been moved a certain distance into a notch following a ratchet tooth, said second spring opposing said first spring to prevent the pawl from striking the bottom of the notch.
  • a calling device including a finger dial adapted for rotation against the tension of a spring, a ratchet wheel, a pawl rotated past successive ratchet teeth when the dial is rotated, a pawl spring for forcing the pawl into the notches between said ratchet teeth, and a third' spring which prevents the pawl from dropping to the bottom of said notches, said pawl and ratchet teeth being so designed that when said first spring applies power to the ratchet through the pawl the latter moves toward the ratchet against the tension of said third spring and fully engages a tooth of the ratchet.
  • a calling device including a rotatable

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Signal Processing (AREA)
  • Transmission Devices (AREA)
US30799A 1935-07-11 1935-07-11 Calling device Expired - Lifetime US2068700A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE416209D BE416209A (en, 2012) 1935-07-11
US30799A US2068700A (en) 1935-07-11 1935-07-11 Calling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30799A US2068700A (en) 1935-07-11 1935-07-11 Calling device

Publications (1)

Publication Number Publication Date
US2068700A true US2068700A (en) 1937-01-26

Family

ID=21856104

Family Applications (1)

Application Number Title Priority Date Filing Date
US30799A Expired - Lifetime US2068700A (en) 1935-07-11 1935-07-11 Calling device

Country Status (2)

Country Link
US (1) US2068700A (en, 2012)
BE (1) BE416209A (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2655052A (en) * 1950-07-29 1953-10-13 Telephonics Corp Impulse switch silencer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2655052A (en) * 1950-07-29 1953-10-13 Telephonics Corp Impulse switch silencer

Also Published As

Publication number Publication date
BE416209A (en, 2012)

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