US2161526A - Automatic burglar and fire alarm - Google Patents

Automatic burglar and fire alarm Download PDF

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Publication number
US2161526A
US2161526A US172462A US17246237A US2161526A US 2161526 A US2161526 A US 2161526A US 172462 A US172462 A US 172462A US 17246237 A US17246237 A US 17246237A US 2161526 A US2161526 A US 2161526A
Authority
US
United States
Prior art keywords
casing
transmitter
microphone
housing
fire alarm
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
US172462A
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English (en)
Inventor
Mountstephen Edred Rabjohn
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2161526A publication Critical patent/US2161526A/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
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
    • H04M11/045—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems using recorded signals, e.g. speech

Definitions

  • the object of' the present invention therefore is to overcome this disadvantage and the invention consists broadly in interconnecting the tone arm of the'gramophone with the telephone transmitter or microphone by an enclosed housing or casing and locating a layer or layers of sound insulating or damping material between the parts connecting the tone arm and/or the transmitter or microphone with the interconnecting housing or casing.
  • tone arm and the housing or casing arranged between it and the transmitter are lined with sound insulating or damping material.
  • the end of the tone arm 2 remote from that on which the sound box 3 of the gramophone is mounted is rigidly connected, for example by welding, with a cylindrical housing or casing 4 into which it opens and which at its opposite end is provided with an end cover in the form of a disc 5 having at its periph- 50 ery an annular cylindrical flange 6 adapted to fit within the cylindrical walls of the casing 4.
  • a normal telephone transmitter or microphone unit 1 is mounted on this covering disc 5 so as to be housed within the housing or casing 4, a central cylindrical projection 8 formed on the back of said transmitter through which the transmitter leads 9 pass, projecting through and-being held in a corresponding cylindrical part III formed by an annular flange extending outwardly from the edge or rim of an aperture formed in the centre of the covering disc 5.
  • the cylindrical projection 8 on the transmitter or microphone I is firmly 5 secured in the cylindrical part II] of the covering disc 5 by a rubber or like sound insulating ring or washer ll located between the outer surface of said projection 8 and the inner wall of the cylindrical part 10. In this way the transmitter or 10 microphone unit is firmly secured in position within the cylindrical housing or casing 4 without being in direct contact therewith.
  • the inner wall of the tone arm 2 of the gramophone is lined with a layer l2 or layers of sound 15 insulating or damping material, such as rubber or felt or both, and the inner walls of the cylindrical housing or casing 4 in which the transmitter or microphone 1 is mounted is lined with sound insulating or damping material consisting preferably of a layer of felt or other fabric l3 and a layer of rubber M.
  • the tone arm 2 of the gramophone instead of being welded to the housing or casing 4 may be connected therewith in the same manner as the transmitter or microphone is mounted on the covering disc 5; also any form of sound insulating material other than rubber and felt may be employed for lining the tone arm of the gramophone and the housing or casing interconnecting said tone arm with the telephone transmitter or microphone.
  • an automatic burglar or fire alarm of the kind described comprising a gramophone operatively connected with a telephone line, an arrangement wherein the telephone transmitter or microphone is. enclosed in a housing or casing interconnected with the tone arm of the gramophone and at least one layer of sound insulating and damping materal is located between the tone arm and the interconnecting housing or casing and between the transmitter or microphone and the interconnecting housing or casing.
  • a tone arm including a casing and a tubular member extending from one side of the casing, a sound box at the outer extremity of the tubular member, a microphonic device having a sound sensitive portion with the casing, and a sound insulating lin- 7 ing extending throughout the inner surface of the casing and the tubular member and enclosing the sound sensitive portion of the microphonic device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Burglar Alarm Systems (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
US172462A 1936-11-04 1937-11-02 Automatic burglar and fire alarm Expired - Lifetime US2161526A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB30013/36A GB484307A (en) 1936-11-04 1936-11-04 Improvements in automatic burglar and fire alarms

Publications (1)

Publication Number Publication Date
US2161526A true US2161526A (en) 1939-06-06

Family

ID=10300856

Family Applications (1)

Application Number Title Priority Date Filing Date
US172462A Expired - Lifetime US2161526A (en) 1936-11-04 1937-11-02 Automatic burglar and fire alarm

Country Status (4)

Country Link
US (1) US2161526A (enrdf_load_stackoverflow)
BE (1) BE424391A (enrdf_load_stackoverflow)
FR (1) FR828568A (enrdf_load_stackoverflow)
GB (1) GB484307A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR828568A (fr) 1938-05-20
GB484307A (en) 1938-05-04
BE424391A (enrdf_load_stackoverflow)

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