Abstract A control mechanism for a steam driven sound transmitter of the type having a valve diaphragm which during signalling oscillates relative to a seat and periodically opens and closes the communication for the steam between an inlet chamber and an outlet passage opening into a resonance horn but which, when no signal is to be generated, is blocked against the seat by the action of the steam pressure in a back pressure chamber located behind the diaphragm, comprises a valve housing with a cavity, steam passages connecting the inlet chamber and the back pressure chamber with said cavity, a drain passage connecting said cavity with a drainage tank, and a valve-controlled relief passage connecting said cavity with the atmosphere, said passage between the inlet chamber and said cavity having a minimum crosssectional area which is smaller than the minimum cross-sectional area of the relief passage but greater than the minimum crosssectional area of the drain passage.
Inventors
👤 N Dahlquist
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-08 07:11
CPC Classifications
G; G10; G10K; G10K7/00; G10K7/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
163 words
A control mechanism for steam driven diaphragm sound transmitters having a diaphragm which during signaling oscillates relative to a seat and periodically opens and closes the communication for the steam between an inlet chamber and an outlet passage opening into a resonant horn but which, when no signal is to be generated, is blocked against the seat by the action of the pressure of the steam in a back pressure chamber located behind the diaphragm, the inlet chamber and the back pressure chamber being connected via passages in a valve housing to a cavity formed in said valve housing and communicating via a drain passage with a drainage tank and via a valve-controlled relief passage with the atmosphere, wherein the improvement comprises the passage between the inlet chamber and the cavity within the valve member having a minimum cross-sectional area which is smaller than the minimum cross-sectional area of the relief passage, but greater than the minimum cross-sectional area of the drain passage.
Claim 2
Dependent Claim
163 words
A control mechanism for steam driven diaphragm sound transmitters having a diaphragm which during signaling oscillates relative to a seat and periodically opens and closes the communication for the steam between an inlet chamber and an outlet passage opening into a resonant horn but which, when no signal is to be generated, is blocked against the seat by the action of the pressure of the steam in a back pressure chamber located behind the diaphragm, the inlet chamber and the back pressure chamber being connected via passages in a valve housing to a cavity formed in said valve housing and communicating via a drain passage with a drainage tank and via a valve-controlled relief passage with the atmosphere, wherein the improvement comprises the passage between the inlet chamber and the cavity within the valve member having a minimum cross-sectional area which is smaller than the minimum cross-sectional area of the relief passage, but greater than the minimum cross-sectional area of the drain passage.
Claim 3
Dependent Claim
44 words
The control mechanism of claim 1 wherein the valve-controlled relief passage comprises an annular passage communicating with a relief passage open to the atmosphere and a valve mechanism which closes said annular passage to escape of steam to the atmosphere through said annular passage.