GB297388A - Improvements in or relating to impulse senders of the finger disc type - Google Patents

Improvements in or relating to impulse senders of the finger disc type

Info

Publication number
GB297388A
GB297388A GB26735/28A GB2673528A GB297388A GB 297388 A GB297388 A GB 297388A GB 26735/28 A GB26735/28 A GB 26735/28A GB 2673528 A GB2673528 A GB 2673528A GB 297388 A GB297388 A GB 297388A
Authority
GB
United Kingdom
Prior art keywords
spring
pawl
wheel
impulse
projection
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
Application number
GB26735/28A
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
Publication of GB297388A publication Critical patent/GB297388A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mechanical Operated Clutches (AREA)

Abstract

297,388. Telefonaktiebalaget L. M. Ericsson. Sept. 20, 1927, [Convention date]. Impulse transmitters for automatic exchange systems. In an instrument of the finger-dial type the contact springs 11 - - 13 are located between the circumference of the impulse wheel 9 and the dial shaft 2 and are actuated by a spring arm 16 which moves in a plane parallel to that of the impulse wheel. The arm 16 carries a pivoted pawl 18 having a sloped projecting end 19 which engages with sloping teeth on the impulse wheel, the pawl being held normally in the position shown in Fig. 4 by a spring 20. In the normal position of the impulse wheel the projection 19 rests on a reduced portion of the wheel so that off-normal contacts 12, 13 are held open. During the setting operation the pawl 18 oscillates in its own plane and the spring 16 only moves sufficiently to close contacts 12, 13. During the return movement, however, the oscillation of the pawl in the opposite direction is prevented by a stop 22 formed by a projection on the spring 16 so that the pawl and spring 16 are lifted to the top of each tooth and the spring 11, 12 are separated to send impulses. The return movement is controlled by a governor 27 geared to a toothed wheel which is connected to the shaft 2 by a oneway friction clutch consisting of a spiral spring.
GB26735/28A 1927-09-20 1928-09-18 Improvements in or relating to impulse senders of the finger disc type Expired GB297388A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE297388X 1927-09-20

Publications (1)

Publication Number Publication Date
GB297388A true GB297388A (en) 1929-09-19

Family

ID=20307354

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26735/28A Expired GB297388A (en) 1927-09-20 1928-09-18 Improvements in or relating to impulse senders of the finger disc type

Country Status (3)

Country Link
BE (1) BE354335A (en)
FR (1) FR660657A (en)
GB (1) GB297388A (en)

Also Published As

Publication number Publication date
FR660657A (en) 1929-07-16
BE354335A (en)

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