US2443799A - Cradle-type telephone subset - Google Patents

Cradle-type telephone subset Download PDF

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Publication number
US2443799A
US2443799A US529317A US52931744A US2443799A US 2443799 A US2443799 A US 2443799A US 529317 A US529317 A US 529317A US 52931744 A US52931744 A US 52931744A US 2443799 A US2443799 A US 2443799A
Authority
US
United States
Prior art keywords
cradle
handset
pins
shaft
type telephone
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
US529317A
Other languages
English (en)
Inventor
Nilsson Karl Wilhelm
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 US2443799A publication Critical patent/US2443799A/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
    • H04M1/04—Supports for telephone transmitters or receivers
    • H04M1/06—Hooks; Cradles
    • H04M1/08—Hooks; Cradles associated with switches operated by the weight of the receiver or hand-set

Definitions

  • the invention relates 'to telephone instruments in which the contact springs arranged in the instrument are actuated by means or" two pins movably arranged in the cradle of the casing.
  • the motive mechanism between said pins and contact springs consists of a bridge supported on a horizontal shaft, one part of the bridge being operated by the pins and the other part operating the contact springs. Said shaft is thereby supported in a rack fixed toa base plate. Said motive mechanism which thus is composed of a number of details causes a comparatively strong friction.
  • Fig. l is a cross section of the instrument.
  • Fig. 2 is a side elevation of the contact springs.
  • Fig. 3 is a cross section of a portion of the instrument along the line A-A in Fig. 1, and
  • Fig. 4 shows a portion of the base plate and the details mounted thereon.
  • I signifies the instrument casing
  • 2 and 3 are the pins movably arranged in the cradle.
  • the contact springs i are fixed to the base plate 6 by means of a bent plate 5.
  • the shaft 'I is in one end riveted to the base plate 6.
  • a member 8 of insulating material in the shape of a cylindrical ring provided with a bottom 22 and top and bottom bearings 9, lll enabling it to slide on the shaft l, is provided. Said member is performed with stop surfaces I2, I3 for the pins 3, 2 and with a wedge-shaped stud I8 which, on the movement of the member, operates the springs 4.
  • a coil-spring Il is arranged between the member il and the base plate 6 which spring tends to move said member and pins 2, i! to their upper position in which the stud I8 does not operate the springs 4 and which position is taken up by said member when the handset is lifted from the cradle.
  • the member 3 is displaced downwardly against the eiect of the spring II, the stud I8 thereby actuating the springs Il.
  • the member 8 is centered in its vertical movement by cooperation between the wedge I8 and the springs I9, 2li which are arranged with their longitudinal direction Vertical.
  • said member is provided with an arm I4 which engages a guide I5 consisting of one leg of the U-shaped plate 5 and having a hole IB, shaped as an hour-glass.
  • a guide I5 consisting of one leg of the U-shaped plate 5 and having a hole IB, shaped as an hour-glass.
  • the motive mechanism i. e., a member slidable along a fixedly arranged shaft, the longitudinal axis of which coincides with that of the pins, it has been possible firstly to considerably reduce the friction, thus enabling the use of a light handset and, secondly, to simplify the manufacture and mounting of said motive mechanism.
  • An instrument according to the invention enables the use of a handset, the weight of which is 20% less than the weight of a handset used in hitherto known instruments.
  • the shaft may be made of raw material which need not be treated in any other way than forming the one end into a tap which is then riveted to the base plate.
  • the member with its arms I2, I3, Iii and the stud I3 are cast in a single structure, for instance in Bakelite.
  • the cylindrical shape of the member t is shown in the embodiment considerably simplifies the manufacture in case said member is pressed in Bakelite.
  • a cradle telephone having a removable handset, a casing, two pins pushed downwards when the handset is placed on the cradle and moved upwards when the handset is removed lfrom the cradle, contact springs operated upon placing and removing of the handset, a shaft iixedly arranged within said casing and disposed parallel with the pins, a member having the shape of a cylindrical ring of press-material, the axis of which is perpendicular to said shaft, said' ring member being sldably arranged on said shaft at two diametrically opposed points, said member being pushed down by means of said pins when the handset is placed on the cradle, spring means for moving said member upwardly when the handset is removed from the cradle, and means on said member for operating said contact springs upon movement of said member.
  • a cradle telephone having a removable handset, a casing, two pins pushed downwards when the handset is placed on the cradle and moved upwards when the handset is removed from thel cradle, contact springs operated upon ⁇ placing and removing of the handset, a shaft xedly arranged within said casing and disposed parallel with the pins, a member having the shape of aV cylindrical ring of press-material, the axis REFERENCES CITED

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Calculators And Similar Devices (AREA)
US529317A 1943-06-02 1944-04-03 Cradle-type telephone subset Expired - Lifetime US2443799A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE241312X 1943-06-02

Publications (1)

Publication Number Publication Date
US2443799A true US2443799A (en) 1948-06-22

Family

ID=20305928

Family Applications (1)

Application Number Title Priority Date Filing Date
US529317A Expired - Lifetime US2443799A (en) 1943-06-02 1944-04-03 Cradle-type telephone subset

Country Status (5)

Country Link
US (1) US2443799A (fr)
CH (1) CH241312A (fr)
DE (1) DE881676C (fr)
FR (1) FR904836A (fr)
GB (1) GB585037A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2855324A (en) * 1955-04-07 1958-10-07 van dorn
US3027432A (en) * 1959-08-18 1962-03-27 Bell Telephone Labor Inc Switching device
US5033083A (en) * 1989-09-29 1991-07-16 At&T Bell Laboratories Telephone line switch apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1917724A (en) * 1931-04-04 1933-07-11 Ericsson Telefon Ab L M Telephone set
US2205491A (en) * 1936-06-19 1940-06-25 Gen Electric Co Ltd Switching device for use in telephone systems

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1917724A (en) * 1931-04-04 1933-07-11 Ericsson Telefon Ab L M Telephone set
US2205491A (en) * 1936-06-19 1940-06-25 Gen Electric Co Ltd Switching device for use in telephone systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2855324A (en) * 1955-04-07 1958-10-07 van dorn
US3027432A (en) * 1959-08-18 1962-03-27 Bell Telephone Labor Inc Switching device
US5033083A (en) * 1989-09-29 1991-07-16 At&T Bell Laboratories Telephone line switch apparatus

Also Published As

Publication number Publication date
GB585037A (en) 1947-01-29
CH241312A (de) 1946-02-28
DE881676C (de) 1953-07-02
FR904836A (fr) 1945-11-16

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