US2217074A - Calling device - Google Patents

Calling device Download PDF

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Publication number
US2217074A
US2217074A US258241A US25824139A US2217074A US 2217074 A US2217074 A US 2217074A US 258241 A US258241 A US 258241A US 25824139 A US25824139 A US 25824139A US 2217074 A US2217074 A US 2217074A
Authority
US
United States
Prior art keywords
pawl
ratchet
spring
calling device
engaging
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
US258241A
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 BE438041D priority Critical patent/BE438041A/xx
Priority to GB538601D priority patent/GB538601A/en
Application filed by Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Priority to US258241A priority patent/US2217074A/en
Application granted granted Critical
Publication of US2217074A publication Critical patent/US2217074A/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
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K1/00—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs
    • G10K1/06—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube
    • G10K1/07—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube mechanically operated; Hand bells; Bells for animals
    • 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 to calling devices of the type employed in automatic telephone systems and, more particularly, to an improved arrangement for reducing the amount of noise ordinarily produced by a calling device incident to the operation thereof.
  • the calling device disclosed in the above-mentioned Obergfell patent comprises a finger dial which is variably rotatable in accordance with the different digits to be dialed and a member attached thereto carrying a pivotally mounted pawl.
  • a cooperating ratchet wheel having a number of teeth spaced apart by intervening notches.
  • the ratchet wheel is associated with a gear wheel which drives a suitable impulse sending mechanism.
  • the finger dial When the finger dial is released, it is returned to its normal position by an associated driving spring at a substantially constant rate controlled by an associated governor.
  • the pawl engages the then over a given number of ratchet teeth aspreviously noted, and being urged by an associated spring toward the ratchet wheel, forcibly drops from the high points of the teeth of the ratchet wheel into the succeeding notches of the ratchet wheel causing a clatter or clicking noise which is quite noticeable, especially if the dialing speed is increased.
  • This clatter or clicking noise is objectionable in that it is quite annoying to a person operating the calling device.
  • the arrangement for reducing the amount of noise ordinarily produced by the calling device incident to the operation thereof, as describedv above, which is disclosed'in the above-mentioned Peterson patent, comprises a spring having one end thereof fixed to the pivotally mounted pawl and the otherend thereof cooperating therewith a pin carried by the member upon which the pawl is pivotally'mounted.
  • the construction and arrangement of the'pawl, the mounting member and cooperating springandpin are such that the spring opposes pivotal movement ofthe pawl into the notch disposed between two adjacent teeth oi the ratchet wheel when the pawl is moved partially into the notch, thereby toprevent the pawl from striking the bottom of the notch.
  • a calling device comprising a mechanism including a ratchet having a number of teeth-spaced apart by intervening notches, a cooperating pawl, and means including a dial for operating the pawl and ratchet; means for reducing the amount, of noise ordinarily produced as the pawl is rotated over successive teeth and notches of the ratchet, which means comprise a spring carried by the pawl and adapted to engage successive teeth and notches'of the ratchet.
  • the spring is so constructed andarranged that a force is exerted thereby upon the pawl as the pawl approaches the ratchet, thereby to cushion themovement of the pawl toward the ratchet as the pawl passes over a tooth and descends in the succeeding notch of the ratchet. More particularly, the ratchet-engaging portion of the 3 for reciprocal movement therein. Also, the pawl and the ratchet are so constructed and arranged that when the pawl exerts a driving force upon the ratchet the pawl is moved against the force exerted thereupon by the spring into direct driving engagement with an adjacent tooth of the ratchet.
  • FIG. 1 is a plan view of a calling device, the finger dial being removed, including an arrangement for reducing the amount of noise ordinarily produced thereby incident to the operation thereof and embodying the present invention
  • Fig. 2 is an enlarged fragmentary plan view of the pawl and ratchet mechanism incorporated in the calling device shown in Fig. 1;
  • Fig. 1 is a plan view of a calling device, the finger dial being removed, including an arrangement for reducing the amount of noise ordinarily produced thereby incident to the operation thereof and embodying the present invention
  • Fig. 2 is an enlarged fragmentary plan view of the pawl and ratchet mechanism incorporated in the calling device shown in Fig. 1;
  • Fig. 1 is a plan view of a calling device, the finger dial being removed, including an arrangement for reducing the amount of noise ordinarily produced thereby incident to the operation thereof and embodying the present invention
  • Fig. 2 is an enlarged fragmentary plan view of the pawl and ratchet mechanism incorporated in the calling device
  • FIG. 3 is an enlarged fragmentary plan view of the ratchet-engaging end of the pawl of the mechanism showing the ratchet-engaging spring mounted thereon in normal position;
  • Fig. 4 is an enlarged side elevational view of the pawl and the ratchet-engaging spring taken in the direction of the arrows44 in Fig. 2; and
  • Fig. 5 is an'enlarged plan view of, the
  • the calling device there shown is of the type of thatdisclosed in the previouslymentioned Obergfell patent and comprises a rotatable plate III having a raised hub I I upon which a finger dial, not shown, having a centrally disposed opening therein is adapted to fit, thefinger dial being held in place by a screw, not shown, threadedv in a tapped holeprovided in the hub I I.
  • a pawl I2 is pivotally mounted on the plate I U by a pivot pin I3 and has a toothed or ratchet-engaging portion or end I4, which is urged in a clockwise direction about the pivot pin I3-by a spring I5 extending between a stud I6 carried by the plate III and an arm II provided on the pawl I2.
  • One end of thespring I5 is fixed to the stud I6 and the other end thereof is fastened in an opening I8 provided in the arm I1.
  • a rotatable ratchet wheel I 9 mounted concentric with the axis of the huh I I is operatively associated with, the pawl I2, the.
  • ratchet wheel I9 being provided with a number of teeth 20 spaced apart by intervening notches 2i.
  • -Also operatively associated with the ratchet wheel I9 is a driving gear, not shown, which is operatively associated with an impulse sending mechanism, not shown, which is operative to cause impulses corresponding to the various digits to be transmitted.
  • a ratchetengaging spring 22 is carried by the pawl I2, the spring 22 having an outwardly extending and 23 and a free end 24.
  • Thespring 22 is arranged on the outside of the pawl I2 and the outwardly extending end 23 thereof projecting through an opening 25 provided in the body portion of the pawl I2, the extreme outer end of the outwardly projecting end 23 thereofbeing bent over into frictional engagement with the body portion of the pawl I2.
  • the ratchet-engaging end I4 of the pawl I2 is provided with a bifurcation or slot 26 therein in which the free end 24 of the spring 22 is disposed,
  • the free end 24 of the spring 22 has a return-bent configuration, the general outline of which is similar, but slightly larger than the outline of the ratchet-engaging end of the pawl I 2.
  • the body portion of the spring 22 is urged into engagement with the adjacent outside surface of the pawl I2 and the forward portion of the free end 24 thereof projects through the slot 26 provided in the ratchet-engaging end I4 of the pawl I2 into engagement with the ratchet wheel I9 associated with the pawl I2.
  • the spring 22 is so constructed and arranged that the free end 24 thereof engages the ratchet wheel I9 thereby to cause the spring 22 to exert a force upon the pawl I2 tending'to rotate the pawl in a counter-clockwise direction about the pivot pin I3.
  • the force exerted upon the pawl I2 by the spring 22 opposes the force exerted thereupon by the spring I5.
  • the finger dial when the finger dial is in place, thefinger dial is rotated in a clockwise direction about the axis of the hub II in the usual manner in accordance with the digit to be transmitted.
  • the plate I0 As the finger dial is rotated in the clockwise direction, the plate I0 is also rotated in the clockwise direction due to the engagementjbetween the finger dial and the hub II of the plate ID.
  • the rotation of the plate I0 in the clockwise direction causes the pawl I2 carried thereby to slip with respect to the associated ratchet wheel I9. Accordingly, the ratchet wheel I9 remains stationary while'the pawl I2 is rotated in the clockwise direction.
  • the ratchet-engaging end I4 thereof rides up one of the teeth 20 of the ratchet wheel I! and then falls into the succeeding notch 2I of the ratchet wheel under theurgeof the spring I5, this movement of the pawl being repeated a number of times depending upon the digit dialed.
  • the ratchet-engaging spring 22 constitutes means for reducing the amount of noise ordinarily produced by the calling device incident to the operation thereof and, more particularly, means for minimizing the clicking noise produced by the ratchet-engaging end I4 of the pawl I2 when it falls into one of the notches 2
  • the spring 15 then rotates the pawl 12 in a clockwise direction thereby to cause the free end 24 of the spring 22 to engage the bottom of the associated notch 2
  • the ratchet-engaging spring 22 prevents the clicking noise ordinarily produced incident to the operation of the calling device due to the cushioning action this spring exerts upon the movement of the pawl l2 toward the associated ratchet wheel I9.
  • a spring not shown, causes the plate ID to be driven in the counter-clockwise direction back to its normal position.
  • the forward edge of the ratchet-engaging end [4 of the pawl l2 engages the then adjacent tooth 20 of the ratchet wheel IS in order to cause an operating force to be exerted between the pawl l2 and the associated ratchet wheel 19, whereupon the ratchet wheel [9 is driven in the counter-clockwise direction in order to cause the driving gear associated therewith to operate the impulse sending mechanism.
  • the pawl l2, the associated ratchet wheel 19, and the ratchet-engaging spring 22 are so constructed and arranged that when moved into the slot 26 provided in the ratchet engaging end of the pawl 12.
  • the ratchetengaging spring 22 is pre-formed as previously noted and then placed upon the associated pawl 12 as previously explained.
  • the extreme outer end of the outwardly projecting end 23 of the ratchet-engaging spring 22 is then bent over in order, frictionally, to engage the body portion of the pawl (2 as previously noted.
  • the subassembly, comprising the pawl l2 and the ratchet-engaging spring 22, is then assembled into the calling device in a well-known manner.
  • the ratchet-engaging spring 22 is so positioned and arranged, without further adjustment thereof, that the clicking noise ordinarily produced incident to the operation of the calling device is eliminated as previously explained.
  • a calling device provided with a mechanism including a ratchet having a number of teeth spaced apart by intervening notches, a cooperating pawl having a recess therein adjacent the ratchet-engaging portion thereof, and means including a dial for operating said pawl and said ratchet; means for reducing the amount of noise produced as said pawl is rotated over successive teeth and notches of said ratchet, said lastmentioned means comprising a spring having one of its ends fixed to said pawl and the other of its ends free, the free end of said spring being disposed in the recess in said pawl and adapted for reciprocal movement therein into engagement with the successive teeth and notches of said ratchet, said spring being so constructed and arranged that the free end thereof is moved into the recess in said pawl as the ratchetengaging portion of said pawl approaches said ratchet, thereby to exert a force upon said pawl in order to cushion the movement of said pawl toward said rat
  • a calling device provided with a mechanism including a ratchet having a number of teeth spaced apart by intervening notches, a cooperating pawl having a recess therein adjacent the ratchet-engaging portion thereof, and means for operating said pawl and said ratchet; means for reducing the amount of noise produced as said pawl is rotated over successive teeth and notches of said ratchet, said last-mentioned means comprising a spring having one of its ends fixed to said pawl and the other of its ends free, the free end of said spring being disposed in the recess in said pawl and adapted for reciprocal movement therein and for engagement with the successive teeth and notches of said ratchet, said spring being so constructed and arranged that the free end thereof is moved into the recess in said pawl as the ratchet-engaging portion of said pawl approaches said ratchet, thereby to cushion the movement of the last-mentioned portion of said pawl as said last-menti
  • a calling device provided with a mecha nism including a ratchet having a number of teeth spaced apart by intervening notches, a cooperating pawl having a bifurcated ratchetengaging portion, and means for operating said and notches of said ratchet, said spring being so constructed and arranged that the free end thereof is moved into the bifurcation in the ratchet-engaging portion of said pawl as the last-mentioned portion thereof'approaches said ratchet, thereby to cushion the movement of the last-mentioned portion of said pawl as said lastmentioned portion thereof passes over a tooth and descends into the succeeding notch of said ratchet.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Telephone Set Structure (AREA)
US258241A 1939-02-24 1939-02-24 Calling device Expired - Lifetime US2217074A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE438041D BE438041A (enrdf_load_stackoverflow) 1939-02-24
GB538601D GB538601A (enrdf_load_stackoverflow) 1939-02-24
US258241A US2217074A (en) 1939-02-24 1939-02-24 Calling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US258241A US2217074A (en) 1939-02-24 1939-02-24 Calling device

Publications (1)

Publication Number Publication Date
US2217074A true US2217074A (en) 1940-10-08

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ID=22979696

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Application Number Title Priority Date Filing Date
US258241A Expired - Lifetime US2217074A (en) 1939-02-24 1939-02-24 Calling device

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US (1) US2217074A (enrdf_load_stackoverflow)
BE (1) BE438041A (enrdf_load_stackoverflow)
GB (1) GB538601A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2613552A (en) * 1950-07-28 1952-10-14 Telephonics Corp Electrical impulse transmitter
US2655052A (en) * 1950-07-29 1953-10-13 Telephonics Corp Impulse switch silencer
US3925741A (en) * 1973-08-30 1975-12-09 Tamura Electric Works Ltd Electromagnetic counter
US5063812A (en) * 1990-09-28 1991-11-12 R. E. Phelon Company, Inc. Pawl assembly for manual starting of small internal combustion engines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2613552A (en) * 1950-07-28 1952-10-14 Telephonics Corp Electrical impulse transmitter
US2655052A (en) * 1950-07-29 1953-10-13 Telephonics Corp Impulse switch silencer
US3925741A (en) * 1973-08-30 1975-12-09 Tamura Electric Works Ltd Electromagnetic counter
US5063812A (en) * 1990-09-28 1991-11-12 R. E. Phelon Company, Inc. Pawl assembly for manual starting of small internal combustion engines

Also Published As

Publication number Publication date
BE438041A (enrdf_load_stackoverflow)
GB538601A (enrdf_load_stackoverflow)

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