US3430003A - Calling dial of the dead-angle type - Google Patents

Calling dial of the dead-angle type Download PDF

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Publication number
US3430003A
US3430003A US500070A US50007065A US3430003A US 3430003 A US3430003 A US 3430003A US 500070 A US500070 A US 500070A US 50007065 A US50007065 A US 50007065A US 3430003 A US3430003 A US 3430003A
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US
United States
Prior art keywords
dial
spindle
rotor
dead
clutch means
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
US500070A
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English (en)
Inventor
Giorgio Dal Monte
Luciano Callegari
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.)
Italtel SpA
Original Assignee
Societa Italiana Telecomunicazioni Siemens SpA
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 Societa Italiana Telecomunicazioni Siemens SpA filed Critical Societa Italiana Telecomunicazioni Siemens SpA
Application granted granted Critical
Publication of US3430003A publication Critical patent/US3430003A/en
Assigned to ITALTEL S.P.A. reassignment ITALTEL S.P.A. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE SEPT. 15, 1980. Assignors: SOCIETA ITALIANA TELECOMUNICAZIONI SIEMENS S.P.A.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04M1/30—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
    • H04M1/34—Lost-motion or other arrangements for ensuring a pause between successive digit transmissions
    • 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

Definitions

  • This invention relates to calling dials of the dead-angle type.
  • a number is dialed by turning the calling dial, after which the calling dial is released.
  • the dial mechanism transmits a signal corresponding to the number or letter which has been dialed, the signal varying according to the angular distance through which the dial has been turned.
  • it is necessary to provide a time lag between the dialing and the transmission of the dialed datum.
  • a number of dialing devices known heretofore ensure the necessary delay by providing a dead angle for the dial return. This means that, upon return movement of the dial, the dial first moves through an angle during which the dial transmits none of the dialed data. The time interval occupied by the dial turning back through this dead angle ensures that the dialed datum will not encroach on a previously dialed datum.
  • FIGURE 1 is a side elevational view of a calling dial mechanism according to the present invention
  • FIGURE 2 is an exploded perspective assembly view of a portion of the structure shown in FIG. 1;
  • FIGURE 2a shows a portion of FIG. 2 in a different position.
  • the calling dial mechanism shown there comprises a ⁇ finger plate 1 which is fixed to and rotatable with a first spindle 19.
  • a gear 3 is fixed to spindle 19 and meshes with a gear 4 carried by a second spindle 11.
  • Spindles 11 and 19 are mounted for rotation on and relative to a base plate 2.
  • the other principal components of the assembly comprise a sector-shaped member 5 fixedly secured to spindle 11, one-way clutch means 6 mounted for rotation on and relative to spindle 11, an impulse rotor 7 also mounted for rotation on and relative to spindle 11, and an impulse contact 18 intermittently engaged by impulse rotor 7.
  • member 5 has abutments- 8 and 9 thereon, which are radially outwardly extending shoulders or opposite peripheral edges on member 5 spaced apart an even fraction of the arc of a circle, in the illustrated embodiment
  • One-way clutch means 6 comprises a central annular boss 17, to which is fixed spring means generally arcuate in configuration about the spindle 11 and having an up standing end 10 and spiralling downward about a spring portion 16 to an opposite end in the form of a pawl 12.
  • Spring portion 16 is helical so that end 10 and pawl 12 are spaced apart a distance axially of spindle 11.
  • Impulse rotor 7 has a plurality of detents 13 thereon which are wedge-shaped to permit movement of pawl 12 counterclockwise thereover but to prevent movement of the pawl 12 clockwise therealong as seen in FIG. 2.
  • Impulse rotor 7 also has a number of radially extending projections 15 thereon equal in number of detents 13 and, on its face opposite detents 13, a number of recesses 23 equal in number to detents 13.
  • Detents 13, projections 15 and recesses 23 are all spaced equally peripherally about rotor 7.
  • a resilient stop spring 20 is fixedly secured to the fixed structure that supports spindle 11, and has a pawl 21 that resiliently snaps into each successively presented recess 23, thereby releasably to retain rotor 7 in any of a plurality'of positions spaced 120 of arc apart.
  • Impulse contact 18 is provided with an end 22 that yieldably contacts each successive projection 15, so that the rotation of impulse rotor transmits a signal by means of impulse contact 18, each time a projection 15 deflects the end 22.
  • member 5 will be brought to the dotted line position shown in FIG. 2a; while upon dialing two, five and eight, member 5 will be brought to the position which is 120 removed from both the full line and the dotted line positions of FIGS. 2 and 2a.
  • abutment 8 moves away from end and abutment 9 moves counterclockwise toward end 10.
  • abutment 9 must move through 240 of arc (equal to two dial intervals) before abutment 9 reaches end 10, that is, before member 5 assumes the phantom line position shown in FIG. 2a.
  • clutch means 6 Further movement of member 5 counterclockwise, once it is in contact with end 10, moves one-way clutch means 6 counterclockwise. Until that time, clutch means 6 remains stationary because impulse rotor 7 is held stationary by stop spring and pawl 12 is in frictional contact with rotor 7, the spindle 11 turning within clutch means 6 and there being insuflicient frictional contact between clutch means 6 and spindle 11 to turn clutch means 6 when spindle 11 turns.
  • pawl 12 When abutment 9 of member 5 contacts end 10 and turns clutch means 6, pawl 12 simply rides up and over the detents 13 in succession. The frictional contact between pawl 12 and detents 13 is insufiicient to move rotor 7 against the releasable spring contact of pawl 21 in recess 23.
  • dial 1 is two dial positions, in the illustrated embodiment.
  • clutch means 6 is turned clockwise.
  • -Pawl 12 is in contact with the steep end of a detent 13, and thereupon moves rotor 7 clockwise.
  • This clockwise movement of rotor 7 is under a sufiiciently strong impetus from pawl 12, thanks to the contact between pawl 12 and the steep end of the associated detent 13, that pawl 21 is popped out of recess 23 and rotor 7 is moved through a number of increments of 120 of are equal to the number dialed.
  • member 5 moves through 240 plus 240 equal 480 of are upon dialing and moves back through 480 of are upon return movement of the dial; but clutch means 6 and impulse rotor 7 move through only 240 of arc upon dial return, as they remain stationary through the first 240 which is the dead angle of spindle 11.
  • These 240 of arcuate movement of impulse rotor 7, however, are just exactly suflicient to transmit two impulses by passage of two projections 15 past end 22 of impulse contact 18. The same principle of operation holds true for the other dialed numbers and intervals.
  • the dead angle of dial 1 is shown as being two intervals, it is obvious that one, three, four, etc. intervals may be chosen to be dead, depending on the lag time needed by the switching equipment between signals.
  • the interposition of gear train 3, 4 merely gives greater flexibility and sensitivity to the mechanism.
  • a calling dial comprising a spindle, a rotatable finger plate for rotating the spindle, an impulse rotor, a pair of abutments on and rotatable with the spindle spaced apart an angular distance corresponding to a dead angle, one-way clutch means for rotating the impulse rotor in one direction only, one of said abutments engaging said one-way clutch means to turn said one-way clutch means in a direction which will not rotate the impulse rotor upon clockwise movement of said finger plate while upon counterclockwise movement of said finger plate said one abutment leaves said one-way clutch means and said abutments rotate through said dead angle until the other said abutment contacts said one-way clutch means to rotate said one-way clutch means in a direction that will rotate said impulse rotor, whereby at the beginning of counterclockwise movement of said finger plate there is no movement of said impulse rotor until said spindle and its abutments have turned through said dead angle.
  • said one-way clutch means including spring means with which said abutments are engageable, and detents on said impulse rotor with which said spring means is engageable, said spring means riding over said dctents when the finger plate turns clockwise but engaging with the detents to turn the impulse rotor when the finger plate turns counterclockwisc.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mechanical Operated Clutches (AREA)
  • Transmission Devices (AREA)
  • Telephone Set Structure (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
US500070A 1964-10-28 1965-10-21 Calling dial of the dead-angle type Expired - Lifetime US3430003A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2313264 1964-10-28

Publications (1)

Publication Number Publication Date
US3430003A true US3430003A (en) 1969-02-25

Family

ID=11204116

Family Applications (1)

Application Number Title Priority Date Filing Date
US500070A Expired - Lifetime US3430003A (en) 1964-10-28 1965-10-21 Calling dial of the dead-angle type

Country Status (9)

Country Link
US (1) US3430003A (it)
BE (1) BE670756A (it)
CH (1) CH423888A (it)
DE (1) DE1261172C2 (it)
DK (1) DK116374B (it)
GB (1) GB1106216A (it)
LU (1) LU49650A1 (it)
NL (1) NL6513866A (it)
NO (1) NO117135B (it)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2252875A (en) * 1939-11-10 1941-08-19 Bell Telephone Labor Inc Call transmitter device
US2919311A (en) * 1955-06-25 1959-12-29 Automatic Telephone & Elect Dial switches for use in telephone or like switching systems

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2252875A (en) * 1939-11-10 1941-08-19 Bell Telephone Labor Inc Call transmitter device
US2919311A (en) * 1955-06-25 1959-12-29 Automatic Telephone & Elect Dial switches for use in telephone or like switching systems

Also Published As

Publication number Publication date
CH423888A (it) 1966-11-15
LU49650A1 (it) 1965-12-20
NO117135B (it) 1969-07-07
DE1261172C2 (de) 1976-11-11
BE670756A (it) 1966-01-31
NL6513866A (it) 1966-04-29
DK116374B (da) 1970-01-05
DE1261172B (de) 1968-02-15
GB1106216A (en) 1968-03-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ITALTEL S.P.A.

Free format text: CHANGE OF NAME;ASSIGNOR:SOCIETA ITALIANA TELECOMUNICAZIONI SIEMENS S.P.A.;REEL/FRAME:003962/0911

Effective date: 19810205