US2718560A - Device for forwarding calling signals in telephone instruments - Google Patents

Device for forwarding calling signals in telephone instruments Download PDF

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Publication number
US2718560A
US2718560A US349241A US34924153A US2718560A US 2718560 A US2718560 A US 2718560A US 349241 A US349241 A US 349241A US 34924153 A US34924153 A US 34924153A US 2718560 A US2718560 A US 2718560A
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US
United States
Prior art keywords
calling signals
movable member
armature
contact
calling
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
US349241A
Other languages
English (en)
Inventor
Alexandersson Harald Valdemar
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 US2718560A publication Critical patent/US2718560A/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
    • H04M1/71—Substation extension arrangements
    • H04M1/715—Substation extension arrangements using two or more extensions per line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/006—Call diverting means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/08—Indicating faults in circuits or apparatus
    • H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error

Definitions

  • the incoming line 1 can be connected with the outgoing line 2 by means of a contact spring device 3.
  • a slide 6 in the switch hook is moved to the position shown on the drawing.
  • the slide is then pressed between a roll 7 on the spring set 3 and a cylinder 8 which is part of a switching means actuated by the armature 22 of the bell 23 of the instrument.
  • the coil 9 of the bell is normally connected to the incoming line 1.
  • the switching means is shown as comprising a shaft 10, on which a lever 11 is fixed.
  • the armature 22 of the bell engages a fork 12 in said lever.
  • the shaft is pressed between three rolls 13 rotatable about pins 14 on cylinder 8.
  • the rolls are connected to the cylinder 8 by means of the balls 15, which are kept in frictional engagement with the two rolls and the cylinder by means of a light spring pressure.
  • the coil 9 of the bell When the coil 9 of the bell is energized, the lever 11 is rocked.
  • the friction coupling formed by balls 15 causes the cylinder 8 to turn in the direction of the arrow, when the lever moves upwards.
  • the lever moves downwards, on the other hand, the cylinder is released and remains stationary during that movement of the lever.
  • a stepwise rotation of the cylinder in the direction of the arrow is obtained as long as the bell works.
  • the slide 6 is moved downwardly step by step and after a sufficiently large rotation of cylinder 8 the slide has been moved so far downwards, that the roll 7 is released and moves to the left, whereby the contact set 3 connects the lines 1 and 2.
  • the incoming calling signal is then forwarded to the outgoing line 2 leading to the next telephone substation set. If receiver 4 is lifted, the slide is restored to its initial position by a lifter 21 on the switch-hook 5 and the connection between the lines 1 and 2 is broken again, whereby the calling signal is forwarded in a known manner tov the line 9 only.
  • the design according to the invention has several advantages in comparison with known designs. As appears from the description no additional relays are required. No additional elements load the line circuits, and the whole device can be made extremely small and cheap. It is naturally not necessary to use the friction connection described above with relation to the invention, but this embodiment permits a very favourable construction of the device mostly due to the described connection effecting a reduction of the movement of the armature of the bell so that the cylinder 8 will turn through very small steps for each call of the bell.
  • a device for forwarding calling signals from one set to another comprising a switching means movable by the armature movements of the signal means of a set of the installation receiving calling signals, an incoming calling line for the said set, an outgoing calling line leading from the said set to another set, and contact means controlling the interconnection of said lines, the said contact means being controlled by the movement of said switching means so as to connect said lines in response -to the said set receiving a predetermined number of calling signals each operating the signal means thereof.
  • a device for forwarding calling signals from one set to another comprising a switching means movable by the armature movements of the signal means of a set of the installation receiving calling signals, an incoming calling line for the said set, an outgoing calling line leading from the said set to another set, contact means controlling the interconnection of said lines, the said contact means being controlled by the movement of said switching means so as to connect said lines in response to the said set receiving a predetermined number of calling signals each operating the signal means thereof, and return means for returning the switching means into a position causing disconnection of said lines by the contact means, the said return means being operable by a component of the said substation set movable by lifting the receiver of the respective set from its cradle.
  • a device for forwarding calling signals from one set to another comprising an incoming line leading to a first substation set of the installation, an outgoing line leading from the first set to a second substation set, contact means on the first set controlling the interconnection of said lines, and switching means controlling said contact means, the said switching means including a first movable member movable by the armature movements of the signal means on the first set due to the reception of calling signals by said set, and a second movable member coacting with the first movable member for movement thereby, movement of the second member from an initial position into a position corresponding to a predetermined number of calling signals received by said first set effecting closing of said contact means for interconnecting said lines.
  • a device for moving said second movable member into a position causing opening of said contact means, the said return.
  • means including a lifting member engageable with said second movable member for the purpose aforesaid and operable by lifting the receiver of said first substation set from its cradle.
  • a device wherein the said contact means comprise a contact member biased into a position closing said contact means, and wherein the said second movable member in its initial position retains said contact member in a position opening said contact means and upon movement into its position corresponding to the predetermined number of received calling signals, releases the contact member for closing said contact means.
  • the said first movable member is a rotary member rotatable by movements of said armature and wherein the said second movable member is an axially displaceable member engaged by the first movable member for effecting displacement of the second member by the rotation of the first member, the said contact member being retained by the second movable member in the initial position of the latter and released upon displacement of the second movable member into the position corresponding to the predetermined number of received calling signals.
  • the said first movable member comprises a rotary hollow cylinder
  • the said second movable member being in movement transmitting engagement with the outer periphery of said cylinder
  • the said one-Way coupling means comprises a rotary shaft, an arm fixedly seated upon said shaft and coupled with said armature for rotating the shaft by the movements of the armature and roller means coupling the shaft with the inner peripheral wall of said cylinder, the said roller means including rollers disposed to transmit rotation in one direction and to idle in the opposite direction thereby causing said cylinder to rotate step-by-step in one direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Devices For Supply Of Signal Current (AREA)
US349241A 1952-05-05 1953-04-16 Device for forwarding calling signals in telephone instruments Expired - Lifetime US2718560A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE725030X 1952-05-05

Publications (1)

Publication Number Publication Date
US2718560A true US2718560A (en) 1955-09-20

Family

ID=20316086

Family Applications (1)

Application Number Title Priority Date Filing Date
US349241A Expired - Lifetime US2718560A (en) 1952-05-05 1953-04-16 Device for forwarding calling signals in telephone instruments

Country Status (4)

Country Link
US (1) US2718560A (da)
DE (1) DE916179C (da)
DK (1) DK81237C (da)
GB (1) GB725030A (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892038A (en) * 1957-05-07 1959-06-23 Gen Dynamics Corp Line adapter circuit for special telephone service
US3041405A (en) * 1958-12-08 1962-06-26 Automatic Elect Lab Line circuit with two-way transfer
US3176082A (en) * 1961-12-12 1965-03-30 Ericsson Telefon Ab L M Telephone ringing signal transfer device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892038A (en) * 1957-05-07 1959-06-23 Gen Dynamics Corp Line adapter circuit for special telephone service
US3041405A (en) * 1958-12-08 1962-06-26 Automatic Elect Lab Line circuit with two-way transfer
US3176082A (en) * 1961-12-12 1965-03-30 Ericsson Telefon Ab L M Telephone ringing signal transfer device

Also Published As

Publication number Publication date
DE916179C (de) 1954-08-05
GB725030A (en) 1955-03-02
DK81237C (da) 1956-07-02

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