Patent US-1918-1336947
From the patent spec: "This invention is an improvement on that disclosed in my former application on improvements in airplanes, Serial No. 259,667, filed Oct. 25, 1918." -- Should we treat this one as a child patent of that one? Haven't done so yet.
"The objects of this invention are to enable the auxiliary propellers to be used as a substitute for the main propeller [if the] engine stops, to continue the forward movement of the plane, and also to enable the auxiliary propellers to be folded away ... when not in use, where they will not appreciably catch the air and retard the progress of the plane." "... while in flight, if the engine suddenly stops the main propeller ... it is necessary that the plane be kept moving in order that the planes may function and keep the airplane in proper position. Therefore in this invention the auxiliary propellers are mounted so that they can be in a position, or instantly moved into a position, whereby they can perform the function of the main propeller and propel the airplane. To do this the auxiliary propellers must at the time be in a vertical position like the main propeller. In my former patent the auxiliary propellers were designed for use to aid in lifting and starting the airplane and to retard the descent thereof in landing. To do that work the auxiliary propellers must be substantially horizontal. [So the invention involves] mounting the auxiliary propellers [so] that they can be moved instantly from a horizontal to a vertical position, preferably forward, and thus perform temporarily the work of the main propellers"
- Thus possibly this is a helicopter design, for safety.
- Tech class CPC B64C23/005: Influencing air flow over aircraft surfaces, not otherwise provided for
- Inventor and assignee location: Shelbyville, Shelby county, Indiana (FIPSloc=18145) (imputed from HistPat)
Sources
- Patent 1336947 document and bibliographic info on espacenet
- Patent 1336947 at google patents
| Year filed | 1918 |
|---|---|
| Year granted | 1920 |
| Office | US |
| Patent number | 1336947 |
| Inventors | Douglas Dobbins |
| Inventor country | US |
| Inventor location | Indiana |
| Applicant person | Douglas Dobbins, John Day De Prez |
| Applicant firm | |
| Applicant type | INDIV |
| Applicant is inventor? | 0 |
| Original title | Airplane |
| English title | Airplane |
| Tech fields | helicopter, safety |
| Filing date | 1918-11-25 |
| Full specification filed date | |
| Application number | 26407618 |
| Grant date | 1920-04-13 |
| Granted? | 1 |
| Publication date | |
| Supplementary to patent | |
| Related to aircraft? | 1 |
| Serial number | 264076 |
| Patent agent | Lockwood & Lockwood |
| Assigned to | John Day De Prez |
| National tech categories | |
| IPCs | IPC B64C23/00 |
| CPCs | CPC B64C23/005, CPC B64C2700/6274 |
| Family year | 1918 |
| First filing? | 1 |
| Cites these patents | Patent US-1918-1336946 |
| Citations from after 1930 | 0 |
| Application ID | 49122967 |
| INPADOC family ID | 44656467 |
| Number of text pages | 3 |
| Number of diagram pages | 2 |
| Number of figures | 5 |
| Number of claims | 8 |
