Patent US-1920-1330329
Inventor reports he wanted to improve the construction and mode of operation of safety valves. Refers to observation balloons extensively.
Specification says ordinary valves are twice as thick as necessary; this invention reduces that thickness. "In the orthodox type of safety valve ..., the greater the amount of the opening of the valve, the greater is the tension on the springs tending to close it. [So when there is a] sudden expansion of the gases contained in the balloon, the patch, to which the valve is connected, is subjected to an undue strain and as a result this patch is liable to be torn rendering the valve functionless and thereby subjecting the balloon itself to the danger of exploding as a result of undue expansion of the gases therein contained."
- "This invention [keeps an approximately] constant tension on the springs ... irrespective of the amount the valve is opened."
- "a ... further feature [is the] mechanism for increasing and decreasing at will the tension on the springs employed to maintain the valve on its seat thereby enabling the valve to be responsive to any predetermined or desired pressure."
- Tech classes: CPC B64B1/64 Gas valve operating mechanisms, Y10T137/2012 Pressure, Y10T137/7905 Plural biasing means, Y10T137/7924 Spring under tension
- Inventor and assignee location: Richmond, Wayne county, Indiana (FIPSloc=18177, imputed from HistPat)
- Maxwell is "assignor to" the Starr Piano Company of Richmond, a corporation of Indiana.
- No source yet observed makes clear what the Starr company meant to do with this invention -- perhaps expand product lines, or apply it to musical instruments
- There is a lot about the company online: Starr Piano Factory, South First Street at lostrichmond/mrlinfo.org; Starr Pianos: Dates and Serial Numbers at waynet.org; Historic Structures: Starr Piano Company, Richmond Indiana at historic-structures.com -- all pianos and music, no aero
Sources
- Patent 1330329 document and bibliographic info on espacenet
- Patent 1330329 at google patents
| Year filed | 1918 |
|---|---|
| Year granted | 1920 |
| Office | US |
| Patent number | 1330329 |
| Inventors | John S. Maxwell |
| Inventor country | US |
| Applicant person | John S. Maxwell |
| Applicant firm | Starr Piano Company |
| Applicant type | COMPANY+INDIV |
| Applicant is inventor? | 1 |
| Original title | Safety-valve |
| English title | Safety-valve |
| Tech fields | safety, valve, balloons |
| Filing date | 1918-10-07 |
| Full specification filed date | |
| Application number | 25722918 |
| Grant date | 1920-02-10 |
| Granted? | 1 |
| Publication date | |
| Supplementary to patent | |
| Related to aircraft? | 1 |
| Serial number | 257229 |
| Patent agent | Kerr, Page, Cooper & Hayward |
| Assigned to | Starr Piano Company |
| National tech categories | |
| IPCs | IPC B64B1/64 |
| CPCs | CPC B64B1/64, CPC Y10T137/2012, CPC Y10T137/7905, CPC Y10T137/7924 |
| Family year | 1918 |
| First filing? | 1 |
| Cites these patents | |
| Citations from after 1930 | 1 |
| Application ID | 49066245 |
| INPADOC family ID | 44618803 |
| Number of text pages | 3 |
| Number of diagram pages | 1 |
| Number of figures | 5 |
| Number of claims | 12 |
