US2887539A - Dial - Google Patents

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Publication number
US2887539A
US2887539A US607206A US60720656A US2887539A US 2887539 A US2887539 A US 2887539A US 607206 A US607206 A US 607206A US 60720656 A US60720656 A US 60720656A US 2887539 A US2887539 A US 2887539A
Authority
US
United States
Prior art keywords
impulse
dial
cam
contact
shoulder
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
US607206A
Other languages
English (en)
Inventor
Alexandersson Harald Valdemar
Sohlberg Carl Oscar
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of US2887539A publication Critical patent/US2887539A/en
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

Definitions

  • the present invention refers to a dial for automatic telephone systems having an impulse cam and an impulse contact actuated by said impulse cam when the dial is rotated.
  • the object of the invention is to provide a dial which is simple and reliable, runs quietly and sends impulses with accurately determined duration.
  • a dial according to the invention is characterized by a blocking element following by frictional engagement part of the way at the I movement of the impulse cam, the blocking element having two shoulders and being arranged for movement between two end positions, one of the shoulders being arranged to keep the impulse contact independent of the impulse cam during movement of the dial in one direction and with the blocking element in one of its end positions, and the other shoulder being arranged to enable the impulse cam to be actuated by the impulse contact during the movement of the dial in an opposite direction and with the blocking element in its other end position.
  • Fig. 1 shows, for the purpose of illustrating the invention, essential parts of a dial made in accordance with the invention, in an initial position.
  • Fig. 2 shows the device according to Fig. 1, when the dial is partially rotated out of the initial position
  • Fig. 3 shows the device according to Fig. l, with the dial in an intermediate position moving back to the initial position from a first rotated position, whereby a blocking means begins to function in order to prevent too short a first impulse in the impulse series
  • Fig. 4 finally shows the device according to Fig. 1, with the dial moving back to the initial position from a second position, whereby this second position is of such a kind, to prevent too short a first impulse in the impulse series.
  • Fig. l 1 is a cam disc directly connected by a shaft 2 to a finger wheel designed for the dialing of figures, but not shown on the drawing.
  • the cam disc 1 is provided with a number of tooth grooves 3 and teeth 4, and a tooth 5 having larger radial extension than the teeth 4.
  • a contact group with four springs 6, 7, 8 and 9 cooperates with the cam disc 1, the springs 6 and 7 of which together an impulse contact 6--7 for the real impulse generation provide and the remaining springs 8 and 9 make a shortcircuit contact 8--9 for bringing about a short-circuit function, which is necessary during the whole time the dial is brought out of its initial position.
  • the spring 6 is provided with a shoulder 10 and a lifting stud 11, that lifts the spring 9, when the dial is in its initial position and the shoulder 10 rests against the tooth 5, thus breaking the short-circuit contact 8-9.
  • a blocking means 12 is mounted on the cam disc 1, said blocking means having the shape of a sector-formed disc with two supporting shoulders 13 and 14 at the periphery of the disc. Because of the friction against the cam disc 1 the blocking means 12 is arranged to follow the same in its movement, but within a limited range, the extension of which is limited by two stops 15 and 16, between which the blocking means then can move.
  • the blocking means 12 follows the cam disc 1 in the beginning, the shoulder 10 slides then off the supporting shoulder 14, and both the springs 6 and 7 move together towards the cam disc 1, whereby an extension 71 of the spring 7, hits the edge of the supporting shoulder 13 and prevents the blocking means 12 from following the cam disc 1 for the present. No impulse has then been produced, in spite of the fact that the shoulder 10 has in any case passed a part of the tooth groove.
  • the nearest following tooth 4 will lift both the springs 6 and 7, whereby the spring 7 is lifted sufliciently high to release the supporting shoulder 13 and thus the blocking means 12 can again follow the cam disc 1, until it is stopped by the stop 16, see also Fig. 4. After this the impulse generation continues in the usual way.
  • a dial for an automatic telephone system comprising, in combination, a shaft, a circular impulse cam mounted upon said shaft and having a plurality of spaced peripheral teeth and intermediate grooves, an impulse contact coacting with the periphery of said cam, said impulse cam being operative to actuate said impulse contact in reate-argues sponse to a rotation of said dial, blocking means mounted upon said shaft in releasable frictional engagement with said impulse cam for actuating said impulse contact, said impuise Contact permitting movement of said blocking means into the same direction .as said impulse cam in response to a movement of said impulse cam toward an initial position when a tooth of said cam is in engagement with said impulse contact, said impulse contact preventing movement of said blocking means towards said initial position when a groove of said cam is in association with said impulse contact and until continued rotation of said cam rotates one of said peripheral teeth into coacting relationship with said impulse contact.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
US607206A 1955-09-19 1956-08-30 Dial Expired - Lifetime US2887539A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2887539X 1955-09-19

Publications (1)

Publication Number Publication Date
US2887539A true US2887539A (en) 1959-05-19

Family

ID=20427682

Family Applications (1)

Application Number Title Priority Date Filing Date
US607206A Expired - Lifetime US2887539A (en) 1955-09-19 1956-08-30 Dial

Country Status (3)

Country Link
US (1) US2887539A (cs)
BE (1) BE551107A (cs)
FR (1) FR1156776A (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919494A (en) * 1973-01-11 1975-11-11 Int Standard Electric Corp Pulse contact delaying mechanism for telephone dials

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB510951A (en) * 1938-02-09 1939-08-09 John Douglas Hinchcliff Improvements in impulse senders of the type used in telephone systems
US2691071A (en) * 1953-12-17 1954-10-05 Stromberg Carlson Co Party line station identification dial mechanism
US2691070A (en) * 1953-11-19 1954-10-05 Stromberg Carlson Co Party line station identification dial mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB510951A (en) * 1938-02-09 1939-08-09 John Douglas Hinchcliff Improvements in impulse senders of the type used in telephone systems
US2691070A (en) * 1953-11-19 1954-10-05 Stromberg Carlson Co Party line station identification dial mechanism
US2691071A (en) * 1953-12-17 1954-10-05 Stromberg Carlson Co Party line station identification dial mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3919494A (en) * 1973-01-11 1975-11-11 Int Standard Electric Corp Pulse contact delaying mechanism for telephone dials

Also Published As

Publication number Publication date
BE551107A (cs)
FR1156776A (fr) 1958-05-21

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