GB1147601A - Improvements in or relating to impulsing mechanisms - Google Patents

Improvements in or relating to impulsing mechanisms

Info

Publication number
GB1147601A
GB1147601A GB1332265A GB1332265A GB1147601A GB 1147601 A GB1147601 A GB 1147601A GB 1332265 A GB1332265 A GB 1332265A GB 1332265 A GB1332265 A GB 1332265A GB 1147601 A GB1147601 A GB 1147601A
Authority
GB
United Kingdom
Prior art keywords
impulse
cam
cam follower
during
dial
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
GB1332265A
Inventor
Robert William Divall
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB1332265A priority Critical patent/GB1147601A/en
Publication of GB1147601A publication Critical patent/GB1147601A/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)
  • Transmission Devices (AREA)
  • Mechanical Control Devices (AREA)

Abstract

1,147,601. Impulse transmitters. ELECTRIC & MUSICAL INDUSTRIES Ltd. 30 March, 1966 [30 March, 1965; 28 Aug., 1965], Nos. 13322/65 and 37081/65. Heading H4K. In an impulse transmitter having a rotatable impulse cam 5, the impulse-contact-operating cam follower 12 is of unitary construction one end of which is fixed to the body of the transmitter while the other end is free to ride on the cam in such a way that during wind-up of the dial the cam follower is moved away from the impulse contacts 15, 16 but during the return motion is moved into engagement therewith so as to actuate them in accordance with the digit selected by the operator. The cam follower is made of a resilient plastics material and it is caused to flex about a fixed post 14a during wind-up. A lost motion period is provided by the movement of the cam follower during the initial portion of the return motion. The governor 11 is driven through a one-way spring clutch 9 (Fig. 1, not shown) and a gear train 6, 8, 10. The main gear 4, impulse cam 5 and the dial shaft (1) are of integral plastics construction. The off-normal contacts 28, 29 are closed by posts 24, 25 on a radially slidable plate 23 when the latter is allowed to move inwardly by the " removal " of a post 22 during wind-up. All the contact spring sets are located in position by pegs 30 moulded in the base and are retained in these positions by screws 21 which also serve as electrical terminals. The dial assembly base-plate is moulded in such a way that, in conjunction with the dial shaft, a dust free enclosure for the moving parts is obtained.
GB1332265A 1965-03-30 1965-03-30 Improvements in or relating to impulsing mechanisms Expired GB1147601A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1332265A GB1147601A (en) 1965-03-30 1965-03-30 Improvements in or relating to impulsing mechanisms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1332265A GB1147601A (en) 1965-03-30 1965-03-30 Improvements in or relating to impulsing mechanisms

Publications (1)

Publication Number Publication Date
GB1147601A true GB1147601A (en) 1969-04-02

Family

ID=10020841

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1332265A Expired GB1147601A (en) 1965-03-30 1965-03-30 Improvements in or relating to impulsing mechanisms

Country Status (1)

Country Link
GB (1) GB1147601A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0013430A1 (en) * 1979-01-08 1980-07-23 THE PLESSEY COMPANY plc Improvements in or relating to dial units for telephone sets

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0013430A1 (en) * 1979-01-08 1980-07-23 THE PLESSEY COMPANY plc Improvements in or relating to dial units for telephone sets

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