US1760566A - Microtelephone - Google Patents

Microtelephone Download PDF

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Publication number
US1760566A
US1760566A US337057A US33705729A US1760566A US 1760566 A US1760566 A US 1760566A US 337057 A US337057 A US 337057A US 33705729 A US33705729 A US 33705729A US 1760566 A US1760566 A US 1760566A
Authority
US
United States
Prior art keywords
microphone
casings
receiver
casing
units
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
US337057A
Other languages
English (en)
Inventor
Schneider Johann
Heckmann Georg
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.)
Firm Fuld & Co Telephon und Te
Firm Fuld & Co Telephon und Telegraphenwerke AG
Original Assignee
Firm Fuld & Co Telephon und Te
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 Firm Fuld & Co Telephon und Te filed Critical Firm Fuld & Co Telephon und Te
Application granted granted Critical
Publication of US1760566A publication Critical patent/US1760566A/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
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets

Definitions

  • MICROTELEPHONE Filed Feb. 2, 1929 Patented May 27, 1930 UNITED STATES PATENT; OFFICE JOHANN' SCHNEIDER AND GEORG- HECKMANN OF. FRANKFORT-ON-THE-MAIN, GER- MANY, ASSIGNORS TO THE FIRM FU'LD & 00. TIELEPHON' UI ⁇ TD TELEGRAPHEN-' WERKE A. Ga, FRANKFORT-ON-THE-MAIN, GERMANY MICROTELEPHONE Application filed February 2, 1929, Serial No. 337,057, and in Germany February 3,1928.
  • the invention relates to micro-telephones
  • the purpose of the invention is a simplification of the outer and inner construction of such. micro-telephones, and consequently, a cheapening of the manufacture and an improvement in the efliciency of the in- .strument.
  • micro-telephones have the disadvantage that the user can, at any time, and Without any special appliances, obtain access to the sensitive internal parts of the microphone and of the receiver. It is true that proposals are already known for preventing an unauthorized openlng of the mlcrophone or receiver casings, by making it only possible to open these casings by means of special tools. These known micro-telephones have, however, the disadvantage that complicated and encumbering appliances must be fitted within the casings and that, further, for the operation of the special appliances, openings must be provided in the casings which are unnecessary for the proper purposes of the microphone or of the receiver and which lead to a deterioration of the transmission of speech.
  • the handle '1 is pressed or produced by squirting as a whole, together with the casing 2 for the receiver unit 3 and the casing 4 for the microphone unit 5, for example from usulating material.
  • the walls 6 and 7 reectively of the casings 2 and 4 are longer than the corresponding thickness of thereings in the casings for the tools, the openings 12 and 13 of the cover parts are formed in a special manner.
  • the opening 12 of the cover part 10 for the receiver casing 2 is hexagonal so that a corresponding key can engage within the same and the speaking opening 13 of the cover part 11 for the microphone casing 4 consists of slots,-into which corresponding projecting parts of a tool can be inserted.
  • the walls 6 and 7 of the casings are towards their outer ends, set off in shoulders or steps. Against these shoulders flanges or collars 26, 14, respectively carried by the units 3 and 5 are applied, whilst the cover parts 10 and 11 are situated in front of the flanges or collars 26 and 14. The units 3 and 5 are thereby maintained in a definite position.
  • a plate 15 is supported, which bears contact springs 16 and 17 and terminals 18.
  • the contact springs 16 and 17 engage against the microphone unit 5 and constitute the electrical connection with the two poles of the microphone.
  • the contact spring 16 is formed as a plate spring and bears against a contact pin 19 at the-centre of the microphone unit- 5, Whilst spring 17 is formed with a ring 20,
  • a micro-telephone comprising a handle carrying at opposite ends integral casings open at the front and interiorly screw-threaded, receiver and microphone units housed within the respective casings so that the walls of the casings project outwards beyond the said units, and covers having their edges screw-threaded and completely screwed into the open fronts of thecasings so as to engage the interior threads thereof, said covers having their outer surfaces formed so that they cannot afford a grip for the hand.
  • a micro-telephone comprising a handle carrying at opposite ends integral receiver and microphone casings open at the front and interiorly screw-threaded at the outer ends and having interior shoulders, receiver and microphone units housed within the respective casings and engaged with the interior shoulders so that the walls of the casings project outwards beyond the said units, and covers having theirouter edges screw-threaded and completely screwed into the threaded open fronts of the casings so as to retain the receiver and microphone units against their respective shoulders, said covers having their outer surfaces formed so that they cannot afford a grip for the hand. .7
  • a micro-telephone comprising a handle carrying,at opposite ends integral receiver and microphone casings open at the front and interiorly screw threaded at their outer ends,
  • a micro-telephone comprising a handle carrying at opposite ends integral receiver and microphone casings open at the front and interiorly screw-threaded at their outer ends, a single interior shoulder on the receiver casing, two interior shoulders on the microphone casing one near the inner end and the'other towards the outer end, receiver and microphone units housed Within the respective casings the receiver unit engaging the single interior shoulder of the receiver casing and the microphone unit engaging the outer shoulder of the microphone casing, so that the walls of the casings project outwards beyond the said units, covers having their outer edges screw-threaded and completely screwed into the threaded open fronts of the casings so as to retain the receiver and microphone units against their respective shoulders said covers having they cannot afford a grip for the hand, and a plate supported against the inner shoulder of the microphone casing, said plate carrying contact springs engaging the poles of the microphone unit and terminals for the connection of the conductors leading to the microphone and receiver.
  • micro-telephone comprising a handle carrying at opposite ends integral receiver and microphone casings open at the front and interiorly screw-threaded at their outer ends, a single interior shoulder on the receiver casing, two. interior shoulders on the microphone casing one near the inner end and the other towards the outer end, receiver and microphone units housed within the respective casings the receiver unit engaging'the single interior shoulder of the receiver casing and the microphone unit engaging the outer shoulder of the microphone casing, so
  • a micro-telephone comprising a handle carrying at opposite ends integral receiver and microphone casings open at the I front and interiorly screw-threaded at their outer ends, a single interior shoulder on the receiver casing, two interior shoulders on the microphone casing one near the inner end and the other towards the outer end, receiver and microphone units housed within the respective casings the receiver unit engaging the single interior shoulder of the receiver casing and themicrophone unit engaging the outer shoulder of the microphone casing, so that the walls of the casings project outwards beyond the said units, covers having their outer edges screw-threaded and completely screwed into the threaded open fronts of the casings so as to retain the receiver and microphone 3 units against their respective shoulders said covers having their outer surfaces formed so that they-cannot afl'ord a grip'for the hand, a plate supported against the inner shoulder oi the microphone casing, and a metallic tube moulded in the handle having terminals at opposite ends situated in the receiver and microphone casings respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
US337057A 1928-02-03 1929-02-02 Microtelephone Expired - Lifetime US1760566A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1760566X 1928-02-03

Publications (1)

Publication Number Publication Date
US1760566A true US1760566A (en) 1930-05-27

Family

ID=7742167

Family Applications (1)

Application Number Title Priority Date Filing Date
US337057A Expired - Lifetime US1760566A (en) 1928-02-03 1929-02-02 Microtelephone

Country Status (2)

Country Link
US (1) US1760566A (fr)
FR (1) FR667002A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530556A (en) * 1947-04-26 1950-11-21 Bell Telephone Labor Inc Support and cord assembly for hand telephones

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530556A (en) * 1947-04-26 1950-11-21 Bell Telephone Labor Inc Support and cord assembly for hand telephones

Also Published As

Publication number Publication date
FR667002A (fr) 1929-10-09

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