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Moulded speech transmitter
| Details |
Inventors: Davis, Ronald E.;
Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister (Ontario, CA)
Primary Examiner: Burr; Edgar S.
Assistant Examiner: Asher; Kimberly L.
Attorney, Agent or Firm: Nixon & Vanderhye
A speech transmitter for use in gas masks and the like comprises a body member having a central, circular recess in one end thereof and a marginal rim surrounding the recess, a cover member having a complementary central, circular recess in one end thereof and a marginal rim surrounding the recess, the cover member marginal rim being lockingly engageable with the body member marginal rim so as to form an unitary assembly in which the body recess and the cover recess are in coaxially aligned, face-to-face relation and define a membrane chamber, the marginal rims having mating surfaces adapted to secure and radially tension a membrane therebetween; and a membrane having a marginal edge interposed between the mating surfaces and a main body portion disposed within the membrane chamber. |
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DETAILED DESCRIPTION The present invention seeks to provide a speech transmitter which is easily manufactured and assembled and which provides reliability of tension application and sealing effectiveness.
In accordance with the present invention, the body and cover members are formed with interlocking means which engage when the two members are axially pressed together into a unitary or integral assembly.
This considerably facilitates assembly of the device.
In addition, the members are formed with interlocking surfaces which cooperate during assembly to securely grip the marginal edge of the mylar membrane and subject the membrane to a uniform radial tension.
This arrangement avoids the need of a tension ring, seals and/or gaskets and, therefore, considerably facilitates both manufacturing and assembling and reduces costs.
Thus, the present invention is generally defined as a speech transmitter for use in gas masks and the like comprising a body member having a central, circular recess in one end thereof and a marginal rim surrounding the recess, a cover member having a complementary central, circular recess in one end thereof and a marginal rim surrounding the recess, the cover member marginal rim being lockingly engageable with the body member marginal rim so as to form an unitary assembly in which the body recess and the cover recess are in coaxially aligned, face-to-face relation and define a membrane chamber, the marginal rims having mating surfaces adapted to secure and radially tension a membrane therebetween, and a membrane having a marginal edge interposed between the mating surfaces and a main body portion disposed within the membrane chamber.
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Obesity Surgery 
