US2133469A - Calling device - Google Patents

Calling device Download PDF

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Publication number
US2133469A
US2133469A US99547A US9954736A US2133469A US 2133469 A US2133469 A US 2133469A US 99547 A US99547 A US 99547A US 9954736 A US9954736 A US 9954736A US 2133469 A US2133469 A US 2133469A
Authority
US
United States
Prior art keywords
pawl
ratchet
teeth
ratchet wheel
wheel
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
US99547A
Other languages
English (en)
Inventor
Herbert F Obergfell
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 BE422956D priority Critical patent/BE422956A/xx
Application filed by Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Priority to US99547A priority patent/US2133469A/en
Priority to FR825817D priority patent/FR825817A/fr
Application granted granted Critical
Publication of US2133469A publication Critical patent/US2133469A/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
    • Y10T74/1558—Grip units and features
    • Y10T74/1565—Gripper releasing devices
    • Y10T74/1566—Power pawl lifter
    • 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
    • Y10T74/1558—Grip units and features
    • Y10T74/1565—Gripper releasing devices
    • Y10T74/1566—Power pawl lifter
    • Y10T74/1568—Automatic
    • Y10T74/1569—Idle stroke
    • 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
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20732—Handles
    • Y10T74/20834—Hand wheels
    • Y10T74/2084—Knob or dial
    • 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

  • This invention relates to calling devices or impulse senders of the type commonly employed in automatic telephone systems for establishing telephone connectio' nsbetween telephone lines or for remote control systems of various types in which selective operations are to be performed.
  • Calling devices as employed in automatic telephone systems are extensively used and are well known to the average telephone subscriber.
  • a further object of the invention is to provide a calling device of standard construction with means for rendering its operation noiseless without extensive changes or alterations to its various parts thereby cheapening the cost of the same.
  • a calling device of the type applicable to the invention and which is widely used is that disclosed in Patent 1,642,822, issued September 20, 1927, to H. F. Obergfell.
  • This calling device has a finger wheel plate which is variably rotatable by the user in accordance with the different digits of a wanted subscriber's telephone number.
  • the finger wheel carries a plate upon which is mounted a pawl, and associated with the pawl is a ratchet wheel having a series of teeth around its periphery. As the finger wheel is rotated the pawl is rapidly rotated and passes over the teeth in succession, the number being dependent upon the digit dialled. Upon release of the finger wheel it returns to normal by means of a spring and at a constant governor controlled speed.
  • the ratchet wheel controls mechanism to operate the impulse transmitting springs to set the automatic switches at the distant 5 switching center or exchange.
  • the pawl passes over a plurality of teeth of the ratchet wheel in succession and being urged by a spring 10 drops between each pair of teeth and then rides up over the following tooth.
  • a spring 10 drops between each pair of teeth and then rides up over the following tooth.
  • the objects of the invention are attatned in accordance with the feature of the invention by 20 the provision of resilient means interposed between the pawl and ratchet mechanism of the calling device.
  • Such resilient means may take the form of an auxiliary rubber ratchet wheel attached to the main ratchet wheel to take up 25 and absorb the force and shock of the pawl dropping between the teeth of the ratchet wheel or alternatively providing the pawl with a rubber nose.
  • the pawl subsequent to dropping between the ratchet wheel and engaging the 30 adjacent tooth makes a metal-to-metal contact to positively rotate the ratchet wheel, the rubber being only utilized to absorb the shock or impact of the spring actuated pawl at the time it drops off the end of a ratchet tooth.
  • Fig. 1 illustrates a front view of a calling device with a portion of certain of the parts cut away;
  • Fig. 2 is an extended perspective view of the pawl and ratchet mechanism of Fig. 1;
  • Fig. 3 is an enlarged rear view of the mechanism; while
  • Figs. 4 and 5 are rear views of the pawl and ratchet mechanisms illustrating modifications of that shown in Fig. 1.
  • the finger wheel dial 5 arranged with its finger holes above the number plate 6, has a central opening'keyed to a raised hub portion 8 of the plate 9 and to 50 which it is held by means of a screw threaded in the hole in the center of hub 8. Manual rotation of the finger wheel 5 clockwise therefore also results in the movement of plate 9.
  • the finger wheel 5 is rotated until the finger stop I 55 is encountered whereupon it is released and then rotates counter-clockwise under control of a tension spring attached to shaft I5 at a governor controlled speed (not shown).
  • the return movement is limited by a projection on plate 9 striking the stop I3.
  • the pawl I is pivoted at II to the plate 9 and is normally urged against and between the teeth of ratchet wheel I4 by the coiled tension spring I2.
  • the ratchet wheel remains stationary and the pawl snaps over the ends and between the ratchet wheel teeth.
  • the pawl engages one of the teeth thereby carrying the ratchet wheel I4 along with it and also rotating the gear wheel which is formed integral with the ratchet wheel.
  • Gear wheel 20 operates the impulsing mechanism (not shown). So far the above parts are constructed and operate in the same manner as in the aforementioned Obergfell patent.
  • auxiliary ratchet wheel I I is interposed between them.
  • This ratchet is preferably constructed of synthetic rubber which resists excessive wear and is immune to corrosion due to the presence of lubricating oil on the dial mechanism.
  • the auxiliary ratchet wheel I1 is formed in the shape of a ring (Fig. 2) with the ratchet teeth on the outside and a pair of oppositely spaced projections I8 on the inside which engage notches I9 on the hub portion formed on the ratchet wheel I4. The two ratchet wheels are thereby held together and movement relative to each other is prevented.
  • a fiber bearing washer I6 is interposed between the auxiliary ratchet wheel I! and the plate 9 carrying pawl III in order to lessen the friction between these parts when the mechanism is operating.
  • Fig. 3 shows an enlarged rear view of the pawl and ratchet mechanism with the gear wheel 20 cut away
  • the teeth of the auxiliary ratchet wheel I! are slightly wider along their sloping or back sides than the teeth of the metal ratchet wheel I4.
  • the extreme outside edges and the faces of the teeth of both ratchet wheels coincide with each other.
  • the finger wheel 5 is rotated manually in the direction indicated by the arrow it carries the plate 9 along with it and this in turn moves the pawl Ill around the teeth of the ratchet wheels I4 and I! which at present remain stationary.
  • the nose of pawl ll] engages the face of the tooth of ratchet wheel I4 that it is stopped at, and establishing contact therewith pulls the ratchet wheel I4 along with it to perform its function of operating the impulsing mechanism through the medium of gear wheel 20.
  • the resilient ratchet teeth cushion the pawl as it passes over the teeth while when the pawl is actually performing its work of pulling ratchet wheel I4 around it makes a direct metal contact with the face of the metal teeth.
  • the pawl therefore contacts with a portion of each ratchet wheel tooth and auxiliary wheel tooth. Wear on the nose of the pawl and obnoxious noises are consequently obviated.
  • this resilient ratchet to calling devices already in use may be readily accomplished by merely replacing the regular ratchet wheel I4 with one having the hub and notches I9 formed in it, or the regular ratchet may be machined and altered to provide these changes.
  • the auxiliary ratchet I! and washer I6 are then added resulting in a noiseless dial.
  • the nose of pawl 20' is provided with a rubber inset 23 held in place in a slot in the pawl and by a rivet 22.
  • attached to the rivet 22 on the end of pawl 29 exerts a pull on the pawl which is in line with the pawl pivot thereby rendering the action of the pawl semi-floating; that is, the spring has a tendency to hold back on the pawl as it falls between the ratchet wheel teeth, thereby lessening its force as it snaps against the sloping sides of the teeth.
  • the rubber nose 23 in addition cushions the impact of the pawl and eliminates the clicking noise.
  • the pawl 20' is made shorter so as to provide an effective length for the pawl spring 2
  • a modification is shown in which the nose of pawl 24 is provided merely with a rubber insert 25 which is held in place in an opening of the pawl by a pin or rivet 26.
  • This rubber insert on the pawl as it passes over the ratchet teeth cushions the impact of the pawl and prevents the metallic contact between the sloping sides of the teeth and the nose. of the pawl.
  • the pawl moves the ratchet wheel it contacts its metal trigger edge with the metal face of the ratchet teeth.
  • means for eliminating the clicking noise comprising an auxiliary ratchet wheel having teeth larger than the teeth of the first ratchet wheel for preventing engagement between the pawl and the back of the teeth of the first ratchet wheel.
  • an auxiliary ratchet wheel having resilient teeth, each tooth of the auxiliary ratchet wheel being of greater area than each tooth of the first ratchet wheel and arranged in juxtaposition to the teeth of the first ratchet wheel for eliminating the clicking pawl noise.
  • a pair of ratchet wheels one of said ratchet wheels having the sloping surface of its teeth arranged slightly in advance of the sloping surface of the teeth of the other ratchet wheel, and means for operating said pawl so as to move first over a portion of a tooth of one ratchet wheel and then over a portion of a tooth of both ratchet wheels.
  • a pair of ratchet wheels arranged side by side, one of said ratchet wheels having resilient teeth arranged with the back of the teeth in advance of the back of the teeth of the other ratchet wheel, the front face of the teeth of both ratchet wheels being coincident, means for moving the pawl forward over the back of the teeth of only one of said ratchet wheels, and means for moving the pawl backward and into engagement with the front face of a tooth of both ratchet wheels.
  • a calling device having a pawl, a ratchet wheel having metal teeth, an auxiliary ratchet wheel having teeth formed of resilient material, means cooperative with both of said ratchet wheels for holding them in locked relationship, means responsive to the operation of said calling device for rotating said pawl across successive ones of the teeth of both ratchet wheels, the resilient teeth preventing any engagement of the pawl with the back of the metal teeth and thus eliminating the noise of the pawl as it drops between the metal teeth, and means for rotating said pawl backward in engagement with the face of one of said metal teeth to rotate both of said ratchet wheels.
  • a pawl and ratchet mechanism means for moving said pawl across the back surface of successive ones of said ratchet teeth, means for moving said pawl back again in engagement with the face of one of said ratchet teeth to rotate the ratchet wheel, and resilient means attached to said pawl for preventing any engagement between the pawl and the back of the ratchet teeth thus eliminating the clicking noise of the pawl as it is moves across the back surfaces of said ratchet teeth.
  • a ratchet wheel a pawl, means for moving the pawl backward over the ratchet wheel without moving the wheel and for moving it forward to engage a tooth to move the wheel, an element of resilient material interposed between the pawl and the back of the teeth of the ratchet wheel, said element having a surface parallel to the back of a tooth of the ratchet wheel and preventing the pawl from engaging any part of the back of a ratchet tooth while permitting direct engagement of the pawl with the front face of a ratchet wheel.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
US99547A 1936-09-05 1936-09-05 Calling device Expired - Lifetime US2133469A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE422956D BE422956A (en, 2012) 1936-09-05
US99547A US2133469A (en) 1936-09-05 1936-09-05 Calling device
FR825817D FR825817A (fr) 1936-09-05 1937-08-20 Perfectionnements aux émetteurs d'impulsions tels que ceux utilisés dans les systèmes téléphoniques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US99547A US2133469A (en) 1936-09-05 1936-09-05 Calling device

Publications (1)

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US2133469A true US2133469A (en) 1938-10-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
US99547A Expired - Lifetime US2133469A (en) 1936-09-05 1936-09-05 Calling device

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US (1) US2133469A (en, 2012)
BE (1) BE422956A (en, 2012)
FR (1) FR825817A (en, 2012)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522004A (en) * 1947-12-24 1950-09-12 Telephonics Corp Electric impulse transmitter pawl silencer
US2757250A (en) * 1953-09-11 1956-07-31 Gen Motors Corp Direction signal mechanisms
US2781666A (en) * 1951-12-26 1957-02-19 Itt Dial type of impulse sender
US2800542A (en) * 1955-08-12 1957-07-23 Gen Motors Corp Direction signal
US3285094A (en) * 1963-09-02 1966-11-15 Micro Electric A G Disc cam device
US3422699A (en) * 1967-04-11 1969-01-21 Friden Inc Antibackup device
US3658655A (en) * 1969-09-19 1972-04-25 Peter N Heere Direct reading relux rating controller for a distillation apparatus
FR2423677A1 (fr) * 1978-04-19 1979-11-16 Poettinger Ohg Alois Dispositif d'entrainement pour le plateau a rouleaux ou a raclettes d'une voiture de chargement

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522004A (en) * 1947-12-24 1950-09-12 Telephonics Corp Electric impulse transmitter pawl silencer
US2781666A (en) * 1951-12-26 1957-02-19 Itt Dial type of impulse sender
US2757250A (en) * 1953-09-11 1956-07-31 Gen Motors Corp Direction signal mechanisms
US2800542A (en) * 1955-08-12 1957-07-23 Gen Motors Corp Direction signal
US3285094A (en) * 1963-09-02 1966-11-15 Micro Electric A G Disc cam device
US3422699A (en) * 1967-04-11 1969-01-21 Friden Inc Antibackup device
US3658655A (en) * 1969-09-19 1972-04-25 Peter N Heere Direct reading relux rating controller for a distillation apparatus
FR2423677A1 (fr) * 1978-04-19 1979-11-16 Poettinger Ohg Alois Dispositif d'entrainement pour le plateau a rouleaux ou a raclettes d'une voiture de chargement

Also Published As

Publication number Publication date
BE422956A (en, 2012)
FR825817A (fr) 1938-03-15

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