GB555527A - Improvements in or relating to telephone subsets - Google Patents

Improvements in or relating to telephone subsets

Info

Publication number
GB555527A
GB555527A GB4175/42A GB417542A GB555527A GB 555527 A GB555527 A GB 555527A GB 4175/42 A GB4175/42 A GB 4175/42A GB 417542 A GB417542 A GB 417542A GB 555527 A GB555527 A GB 555527A
Authority
GB
United Kingdom
Prior art keywords
switch
magnet
hand
soft
support
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
GB4175/42A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB555527A publication Critical patent/GB555527A/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
    • H04M1/02—Constructional features of telephone sets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • H01H36/0046—Limit switches, also fail-safe operation or anti-tamper considerations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/04—Supports for telephone transmitters or receivers
    • H04M1/06—Hooks; Cradles
    • H04M1/10—Hooks; Cradles associated with switches operated by magnetic effect due to proximity of receiver or hand-set

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Telephone Set Structure (AREA)

Abstract

555,527. Telephone instruments ; switches. STANDARD TELEPHONES & CABLES, Ltd. March 28, 1942, No. 4175. Convention date, Jan. 24, 1941. [Class 40 (iv)] [Also in Group XXXVII] The switch contacts of a telephone sub-set are so arranged in relation to a magnetic circuit which traverses the receiver and the base portion when the receiver is carried by the latter as to be operated by the change of magnetic flux which occurs when the receiver is removed. In the form shown in Fig. 1, the magnetic circuit is formed by soft-iron members 7, 8, a magnet 9, and the reeds 11, 12 of a magnetically-operated switch, all arranged in the support 5, together with a soft-iron member 6 in the hand-set 1. When the latter is laid on the support, as shown, part of the magnetic flux which otherwise passes through the reeds 11, 12 and causes them to close the contacts is diverted through the path which is completed by the member 6, thus causing the switch to open. In one modification the magnet bridges the lower ends of the members 7, 8 and the switch the upper ends, and in another the members 7, 8 are replaced by magnets, a softiron bar bridges their lower ends, and the switch occupies the position shown of the magnet 9. Other forms comprise a bar magnet and the switch, arranged one in the hand-set and the other in the support so that when the hand-set rests on the latter the magnet and switch are in close parallel relationship, causing the switch contacts to close. In the form shown in Fig. 5, in which the hand-set hangs on the support, a mercury type magnetic switch 28 is arranged between soft-iron pole pieces 29, 30 on a magnet 25, and a soft-iron member 6 in the hand-set diverts a portion of the flux through itself and through auxiliary polepieces 26, 27 when the hand-set is hung up, thus causing the contacts to open. Several switches may be operated sequentially by using switches of different sensitivities, or by locating them differently in the magnetic circuit.
GB4175/42A 1941-01-24 1942-03-28 Improvements in or relating to telephone subsets Expired GB555527A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US375717A US2322851A (en) 1941-01-24 1941-01-24 Magnetic switch hook

Publications (1)

Publication Number Publication Date
GB555527A true GB555527A (en) 1943-08-26

Family

ID=23482018

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4175/42A Expired GB555527A (en) 1941-01-24 1942-03-28 Improvements in or relating to telephone subsets

Country Status (6)

Country Link
US (1) US2322851A (en)
BE (1) BE443017A (en)
CH (1) CH231797A (en)
FR (1) FR887174A (en)
GB (1) GB555527A (en)
NL (1) NL57098C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0000309A1 (en) * 1977-06-27 1979-01-10 COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel Hollow-beam generator producing monokinetic electrons along helicoidal paths

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431319A (en) * 1943-02-09 1947-11-25 Walter B Ellwood Magnetic firing device
US2523297A (en) * 1945-08-02 1950-09-26 Charles E Hastings Frequency meter
US2623128A (en) * 1946-03-15 1952-12-23 Automatic Telephone & Elect Telephone instrument with magnetic handset latch
US2546647A (en) * 1946-08-01 1951-03-27 Automatic Elect Lab Magnet operated sealed switchboard
US2672523A (en) * 1949-09-16 1954-03-16 Bell Telephone Labor Inc Telephone subscriber
US2673252A (en) * 1949-09-28 1954-03-23 Automatic Elect Lab Magnetic cradle switch
US2636933A (en) * 1949-11-21 1953-04-28 Allis Chalmers Mfg Co Control system responsive to presence of magnetic materials
US2848572A (en) * 1957-03-06 1958-08-19 Bendix Aviat Corp Electrical disconnect plug
US2912540A (en) * 1958-02-13 1959-11-10 American District Telegraph Co Defeat resistant burglar alarm contact
US3005885A (en) * 1958-09-12 1961-10-24 Foxboro Co Safety switch arrangements
US3009033A (en) * 1959-04-20 1961-11-14 Gen Electric Limit switches
US3157747A (en) * 1960-05-10 1964-11-17 Bell Telephone Labor Inc Automatic selecting switch
DE1149398B (en) * 1962-04-02 1963-05-30 Siemens Ag Arrangement for a telephone handset with local battery, preferably for a test telephone
DE1160019B (en) * 1962-05-05 1963-12-27 Telefonbau & Normalzeit Gmbh Telephone subscriber station with protective tube fork switch contacts
US3147819A (en) * 1963-06-13 1964-09-08 Timothy B Keleher Seat belt control for ignition system
US3305805A (en) * 1963-11-14 1967-02-21 Tann David Proximity switch
GB1038229A (en) * 1963-11-29 1966-08-10 Ass Elect Ind Improvements relating to subscriber's telephone instruments
US4251694A (en) * 1979-08-16 1981-02-17 Western Electric Company, Inc. Tone-ringing circuits and methods for telephone sets
DE2941220C2 (en) * 1979-10-11 1983-03-24 Krone Gmbh, 1000 Berlin Electronically controlled hook switch for telecommunications equipment or the like.
EP0128500A3 (en) * 1983-06-14 1986-08-20 Telelogic, Inc. Telephone with cradle having no moving parts
US4581490A (en) * 1983-12-22 1986-04-08 Richard Genender Wall telephone assembly
US4675903A (en) * 1984-06-29 1987-06-23 Wang Laboratories, Inc. Telephone handset assembly
US6289100B1 (en) * 1999-03-09 2001-09-11 Hubbell Incorporated Communications station having hall effect device for controlling hookswitch operations
TWI577165B (en) * 2015-11-10 2017-04-01 和碩聯合科技股份有限公司 Telephone device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0000309A1 (en) * 1977-06-27 1979-01-10 COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel Hollow-beam generator producing monokinetic electrons along helicoidal paths

Also Published As

Publication number Publication date
NL57098C (en)
BE443017A (en)
CH231797A (en) 1944-04-15
FR887174A (en) 1943-11-05
US2322851A (en) 1943-06-29

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