US2322851A - Magnetic switch hook - Google Patents

Magnetic switch hook Download PDF

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Publication number
US2322851A
US2322851A US375717A US37571741A US2322851A US 2322851 A US2322851 A US 2322851A US 375717 A US375717 A US 375717A US 37571741 A US37571741 A US 37571741A US 2322851 A US2322851 A US 2322851A
Authority
US
United States
Prior art keywords
magnetic
contacts
handset
cradle
circuit
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
US375717A
Other languages
English (en)
Inventor
Robert M Kalb
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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
Priority to NL57098D priority Critical patent/NL57098C/xx
Priority to BE443017D priority patent/BE443017A/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US375717A priority patent/US2322851A/en
Priority to FR887174D priority patent/FR887174A/fr
Priority to CH231797D priority patent/CH231797A/de
Priority to GB4175/42A priority patent/GB555527A/en
Application granted granted Critical
Publication of US2322851A publication Critical patent/US2322851A/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
    • H04M1/02—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

Definitions

  • This invention relates to communication apparatu and particularly to the operation of switching contacts responsive tothe taking into use of such apparatus.
  • the in vention when applied to telephone apparatus the in vention may be defined as relating to magnetic Bwitchhook operation, the object being to improve the construction arrangement and functioning of subscribers telephones, by insuring the positive operation of the switching contacts and eliminating moving mechanical parts. Another object is the protection of th contacts against dirt and other foreign matter that would tend to destroy the efficiency of the contact surfaces.
  • a magnetic circuit including magnetically operated contacts is provided, partly in the apparatus used by the subscriber and partly in the support provided to hold such apparatus when not in use. The movement of the apparatus to and from its support will operate the contacts.
  • the magnetic circuit is shown as applied to a telephone handset and its cradle.
  • the handset has incorporated in it a magnetic element which cooperates with other magnetic elements incorporated in the cradie to operate circuit contacts which perform the usual operations of the switchhook contacts.
  • the magnetic circuit is shown in a variety of forms each having its own peculiar merits.
  • a permanent magnet is embedded or incorporated in the handset so as to operate a setof magnetically operable contacts in the cradle when the handset is placed in its normal position on the cradle.
  • Th magnetically operated contacts may be of any well-known form, though herein sealed contacts are shown as being preferable to mere magnetically movable open contacts. Since applicant does not claim any particular type of contact device it may be noted that, among many others, the contacts of the following examples of the prior art may be usefully employed: Cox,
  • Another feature of the invention is a set of circuit making contacts in the cradle of a telephone responsive, without intermediary mechanical movement, to the movement of a handset onto and from the cradle.
  • Another feature is the provision of magnetic means in a handset for operating circuit contacts in a cradle upon'the lifting of the handset from the cradle.
  • Another feature is a compound magnetic circuit having one branch through a set of magnetically operated contacts and another and lower reluctance branch thereof in shunt of said first branch completed through a movable magnetic member.
  • thesaid movable magnetic member may be embedded in or incorporated in a telephone handset while the remainder of the circuit may be incorporated in the cradle provided therefor.
  • Another feature is the provision of a soft iron member embedded in a handset for cooperation with a magnetic circuit including a set of magnetically operated circuit closing contacts constructed and arranged in the cradle provided for the support of the handset, whereby the operation of the said contacts will be equally eifective in either of two normal positions of the handset. Since the handset may easily be placed on its cradle with the transmitter and cord end to the right as to the left the use of soft iron does not have the disadvantages of a polarized magnetic I element.
  • Fig. 1 shows a preferred embodimentof the invention wherein the permanent magnet and the circuit contacts are'embodied in the cradle for the telephone, known as the attenuator type, depending on loss; a
  • Fig. 2 shows an alternative arrangement of the permanent magnets and circuit contacts
  • Fig. 3 shows a simple form of the invention wherein a permanent magnet is embodied in the handset and a set of contacts is located in the cradle;
  • Fig. 4 is a variation of the device shown in Fig. 3 with the permanent magnet located in the cradle and the contacts in the handset;
  • Fi 5 shows anarrangement when a different type of cradle is used in which the handset is hung vertically;
  • Fig. 6 shows a variation of the magnetic circuit shown in Fig. 1; 1
  • Fig. I is a magnetic circuit diagram of the arrangement shown in Fig. 1;
  • Fig. 8 is a magnetic circuit diagram of the ara piece of soft iron which is embedded in the plastic material out of which the handset is moulded.
  • a permanent magnet 9 Within the cradle 5 there are 'two pieces of soft iron I and 8, a permanent magnet 9 and a set of contacts l9. With the handset I removed from the cradle the field of the permanent magnet 9 will find its way through the soft iron pieces I and 8 and the magnetic reeds of the contact Ill and cause these reeds II and I2 to make'contact with each other. Therefore, when the handset I is removed from its cradle 5 the circuit contacts II and 12 are closed.
  • the soft iron piece 6 When the handset l is placed in the position shown then the soft iron piece 6 will sufllciently divert the field of permanent magnet 9 through the piece 6 and away from the contact reeds type since the action of the contacts depends on loss of the field when the air-gap between the part 6 and parts I and 8 is shortened.
  • Fig. 7 shows the principle of operation of the device of Fig. 1.
  • the permanent magnet 9 is shown as a'source of magnetomotive force 40. 4! represents the reluctance of the magnet 9 and 42 and 43 show the reluctances of the air-gaps between the magnet 9 and the pieces I and 8. respectively.
  • the variable element 44 represents the reluctance of the combined air-gaps between the pieces! and 8 and the magnetic element 6.
  • the diagram elements 45 and 46 represent the reluctances of the air-gaps between the reeds H and I2 and the pieces 1 and 8, respectively, and finally the variable element 41 represents the reluctance of the air-gap between the reeds II and I2.
  • the magnetically operated contact device I0 i known generally as an Ellwood relay which is more particularly described in the aforementioned Ellwood patent. Any other type of mag 'netically operated contact device may be vertically arranged magnetic elements which are i approached by the magnetic element 6 when the 19 to make contact with each other.
  • the handset is placed on its cradle are in the form of two permanent magnets l3 and I4.
  • the magnetically operated contact device i5 is placed substantially midway of the length of these permanent magnets l3 and i4.
  • a soft iron element l6 At the end opposite those ends approached by the magnetic element 6 is a soft iron element l6.
  • the magnetically operated contact device i5 is placed substantially midway of the length of the permanent magnets it should be understood that considerable variation in this placing is possible, as indicated in Fig. 8.
  • the magnetomotive force of the magnets l3 and I4 is represented by the diagram Again, there is an air-gap between the reeds H and I2.
  • the reluctance of the air-gap between the soft iron piece I and the magnets l3 and I4 is represented by the diagram element 32.
  • 53 represents the reluctance of the air-gaps between the reeds l1 and I8 and the magnets I3 and I4 and 54 represents the variable air-gap between the reeds I1 and
  • Fig. 3 represents a simple form of the inven-- tion in which the handset I rests on a cradle 5.
  • Fig. 6 an arrangement, alternative to the arrangement shown in Figs. 1 and 2, is disclosed.
  • the usual soft iron element of the magnetic circuit is incorporated in the handset I.
  • and 32 are placed in the cradle 5 and a permanent magnet33 is located on the lower extremities of these elements.
  • the rectangle 34 represents a piece of A permanent magnet 20 is incorporated in the handset and when placed on the cradle as shown, causes the operation of the contact device 2
  • the piece 22 becomes an armature which lifts-away from a non-magnetic back contact 23 due to influence of the permanent magnet 20.
  • the armature 22, not being energized any more by the magnet 20 will drop back and make contact with the element 23.
  • may be constructed in the form of an ordinary armature and back contact but the sealed type is preferred. As shown this may be a pair of sealed contacts such as shown in the aforementioned Cox or Leece patentsor it may be of that type developed by Ellwood with a back contact instead of the usual front contact.
  • Fig. 4 shows a variation of the arrangement shown in Fig. 3 with the contact device 2
  • Fig. 5 is shown an alternative arrangement brass or other non-magnetic material and here represents the means whereby the elements may be mechanically secured together while still providing the necessary air-gap.
  • the Ellwood type unit is illustrated as a magnetically operated contact device 35'having two reeds 36 and 31. from the position shown and taken into use the field of the permanent magnet'33 finds its way through the elements 36 and 31 ofthe contact device 35 and causes them to close together thereby closing the electrical circuit there-- through.
  • the soft iron piece 6 sufficiently diverts the field of the magnet 33 from the elements 36 and 31 to cause them to assume the open position here shown.
  • an electromagnet may be as easily substituted. It is only necessary to have a source of magnetomotive force and hence all references to a permanent magnet which said sound translating apparatus normally rests, a set of magnetically operated circuit contacts extending between the other ends of said magnetic elements, a permanent magnet extending substantially'from one of said elements to When the handset is removed the other of said elements at a point substantially,
  • a supporting structure sound translating apparatus removably supported thereon, a pair of magnetic elements in said support each terminating in one end thereof substantially at the surface of said support on which said sound translating apparatus normally rests, a set of magnetically operated circuit contacts extending between the other ends of said magnetic elements, a permanent magnet extending substantially from one of said elements to the other of said elements at a point substantially midway of their length and a magnetic element incorporated in said sound translating apparatus and disposed to extend substantially between the said first ends of said magnetic elements, said various magnetic elements being constructed and arranged to form a magnetic circuit including a plurality of air gaps and so proportioned that when said sound translating apparatus is resting in its normal position on I structure, sound translating apparatus removably supported thereon, a pair of permanent magnets in said support each terminating in one end thereof substantially at the surface of said support on which said sound translating apparatus normally rests, a low reluctance magnetic path between the other ends of said permanent mag- I nets, a settof magnetically operated circuit contacts extending
  • a hand telephone comprising a receiver and a transmitter moulded into either end of a handle of insulating material removably supported on said supporting structure, a bridge type magnetic circuit having a permanent magnet acting as a source of magnetomotive force effective at two corners thereof and magnetically operated circuit contacts effective at the remaining two corners of said circuit, one arm of said magnetic circuit including a magnetic element moulded into said handle, magnetic elements mounted in said supporting structure and the air gaps therebetween, whereby the force from said permanent magnet efiective to operate said contacts may be controlled by varying the said air gaps in said one arm of said bridge circuit.
  • a supporting structure a hand telephone comprising a receiver and a transmitter moulded into either end of a handle of insulating material removably supported on .said supporting structure, a complex magnetic circuit comprising a plurality of elements in aplurality of branches and including a-permanent magnet and a pair of magnetically operated contacts in one of said branches mounted in said supporting structure, extensions of said magnetic circuit comprising another branch thereof being positioned to be contiguous to said hand telephone when said hand telephone is positioned on said support and a magnetic element moulded in said hand telephone to control said other branch of said magnetic circuit by attenuation when said hand telephone is so positioned.
  • a complex magnetic circuit comprising a plurality of elements in a plurality of branches and including a permanent magnet and a pair of magnetically operated contacts in one of said branches mounted in said supporting structure, said contacts being mounted within said structure near the surface approached by said hand telephone when positioned on said support and a magnetic element moulded in said hand telephone for completing another branch of said magnetic circuit in parallel with said contacts when said hand telephone is so positioned.
  • a supporting structure sound translating apparatus removably supported thereon, a pair of magnetic elements in said supp rt each terminating in one end thereof substantially at the surface of said support on which said sound translating apparatus normally rests, a third magnetic element extending between the other ends of said first and second magnetic elements, a fourth mag netic element extending substantially from said 2,822,851 first element to said second element at a point substantially midway oi.
  • said various magnetic elements being constructed and arranged to form a magnetic circuit including a plurality of air gaps and so proportioned that when said sound translating apparatus is resting in its normal position on said support the field of said permanent 'magnet will be sufliciently diverted from a path through said contacts to a path through said fifth magnetic element to allow said contacts to assume their normal unoperated positions.
  • a supporting said elements comprising a' structure, a hand telephone comprising a receiver and a transmitter moulded into either end of a handle of insulating material removably supported on said supporting structure, a complex mag- 'netic circuit comprising a plurality of elements in a plurality of branches including a permanent magnet and magnetically operated circuit contacts, one element of said magnetic circuit being moulded into said handle and the remaining elements of said magnetic circuit being mounted in said supporting structure, the position of said one element in said handle being such i that an air gap is included in said magnetic circuit when said handle is in its normal position on said support, and a compensating air gap in said magnetic circuit in said supporting structure whereby the field of said permanent magnet is sufllciently diverted from said contacts in said normal position of said apparatus to release said contacts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
US375717A 1941-01-24 1941-01-24 Magnetic switch hook Expired - Lifetime US2322851A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL57098D NL57098C (da) 1941-01-24
BE443017D BE443017A (da) 1941-01-24
US375717A US2322851A (en) 1941-01-24 1941-01-24 Magnetic switch hook
FR887174D FR887174A (fr) 1941-01-24 1941-12-11 Appareils pour systèmes de communications électriques
CH231797D CH231797A (de) 1941-01-24 1942-03-09 Fernmeldeapparat.
GB4175/42A GB555527A (en) 1941-01-24 1942-03-28 Improvements in or relating to telephone subsets

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
US2322851A true US2322851A (en) 1943-06-29

Family

ID=23482018

Family Applications (1)

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

Country Status (6)

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

Cited By (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
US2546647A (en) * 1946-08-01 1951-03-27 Automatic Elect Lab Magnet operated sealed switchboard
US2623128A (en) * 1946-03-15 1952-12-23 Automatic Telephone & Elect Telephone instrument with magnetic handset latch
US2636933A (en) * 1949-11-21 1953-04-28 Allis Chalmers Mfg Co Control system responsive to presence of magnetic materials
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
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
DE1149398B (de) * 1962-04-02 1963-05-30 Siemens Ag Anordnung fuer einen Fernsprechhandapparat mit Ortsbatterie, vorzugsweise fuer einen Prueffernsprecher
DE1160019B (de) * 1962-05-05 1963-12-27 Telefonbau & Normalzeit Gmbh Fernsprechteilnehmerstation mit Schutzrohrgabelumschalterkontakten
US3147819A (en) * 1963-06-13 1964-09-08 Timothy B Keleher Seat belt control for ignition system
US3157747A (en) * 1960-05-10 1964-11-17 Bell Telephone Labor Inc Automatic selecting switch
US3305805A (en) * 1963-11-14 1967-02-21 Tann David Proximity switch
US3387102A (en) * 1963-11-29 1968-06-04 Ass Elect Ind Subscriber's telephone instruments
US4251694A (en) * 1979-08-16 1981-02-17 Western Electric Company, Inc. Tone-ringing circuits and methods for telephone sets
DE2941220A1 (de) * 1979-10-11 1981-05-07 Krone Gmbh, 1000 Berlin Elektronisch gesteuerter gabelumschalter fuer fernmeldetechnische geraete o.dgl.
EP0128500A2 (en) * 1983-06-14 1984-12-19 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
US20170134544A1 (en) * 2015-11-10 2017-05-11 Pegatron Corporation Telephone device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2401508A1 (fr) * 1977-06-27 1979-03-23 Commissariat Energie Atomique Injecteur d'electrons pour generateur hyperfrequence

Cited By (26)

* 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 (de) * 1962-04-02 1963-05-30 Siemens Ag Anordnung fuer einen Fernsprechhandapparat mit Ortsbatterie, vorzugsweise fuer einen Prueffernsprecher
DE1160019B (de) * 1962-05-05 1963-12-27 Telefonbau & Normalzeit Gmbh Fernsprechteilnehmerstation mit Schutzrohrgabelumschalterkontakten
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
US3387102A (en) * 1963-11-29 1968-06-04 Ass Elect Ind Subscriber's telephone instruments
US4251694A (en) * 1979-08-16 1981-02-17 Western Electric Company, Inc. Tone-ringing circuits and methods for telephone sets
DE2941220A1 (de) * 1979-10-11 1981-05-07 Krone Gmbh, 1000 Berlin Elektronisch gesteuerter gabelumschalter fuer fernmeldetechnische geraete o.dgl.
EP0128500A2 (en) * 1983-06-14 1984-12-19 Telelogic, Inc. Telephone with cradle having no moving parts
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
US20170134544A1 (en) * 2015-11-10 2017-05-11 Pegatron Corporation Telephone device
US9716780B2 (en) * 2015-11-10 2017-07-25 Pegatron Corporation Telephone device

Also Published As

Publication number Publication date
BE443017A (da)
GB555527A (en) 1943-08-26
CH231797A (de) 1944-04-15
NL57098C (da)
FR887174A (fr) 1943-11-05

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