Flying Machine Page: 3 of 6
[2], 4 p. : ill. ; 23 cm.View a full description of this patent.
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UNITED STATESPATENT OFFICE.
JAMES C. CRITCHETT, OF EL PASO, TEXAS.
FLYING-MACHINE.Specification of Letters Patent.
Patented Feb. 18, 1919.
Application filed March 11, 1918. Serial No. 221,827.
To all whom it may concern:
Be it known that I, JAMES C. CRITCHETr,
a citizen of the .United States, residing at
El Paso, in the county of El Paso and
5 State of Texas, have invented certain new
and useful Improvements in Flying - Ma-
chines; and I do hereby declare the fol-
lowing to be a full, clear, and exact de-
scription of the invention, such as will en-
10 able others skilled in the art to which it ap-
pertains to make and use the same.
The present invention relates to improve-
inents in flying machines, and has for an ob-
ject to provide an improved flying machine
15 having a framework built up in the shape
of one or a plurality of tetrahedral figures,
whereby a relatively small flying machine
may be constructed in the form of a single
tetrahedron, while larger machines may be
20 produced by enlarging upon the smaller
framework without alteration. By this
means the tetrahedron forms a standardized
unit for flying machines of small or large
size, and the work of constructing and as-
25 sembling the parts is simplified and ren-
dered expeditious. .
Another object of the present invention
resides in providing a flying machine with
a framework in which the component mem-
30 bers are united after the fashion of a tetra-
hedral figure, thereby securing great
strength with little strain on the individual
members of the framework, enabling the
use of inferior material to that necessary
35 for the present construction of aeroplanes,
and eliminating the necessity for that care-
ful selection of material that is at present
practised.
A further object of the present invention
40 resides in providing a flying machine which
will combine great strength with lightness,
and have increased carrying capacity.
It is a further object of the present inven-
tion to provide a flying machine in which
45 the framework will afford one or more con-
venient and strong locations for fuselage,
platforms, power plants, etc.
In the accompanying drawings forming
a part of this application; and in which
50 similar reference symbols indicate corre-
sponding parts in the several views:
Figure 1 is a side elevational view of one
form of flying machine constructed in ac-
cordance with my present invention.Fig. 2 is a rear elevational view thereof. 56
Fig. 3 is a top plan view of the flying ma-
chine; and
Fig. 4 is a diagrammatic perspective view
of a fragment of the machine framework.
In Figs. 1, 2 and 3 of the drawings is 60
shown a flying machine, the framework
whereof is constructed in the shape of three
tetrahedral figures located side by side and
having parts thereof in common.
Referring in detail to the construction, 1 65
designates the lower edge member of the
central portion of the framework; while 2
and 3 represent the edge members of the
tetrahedral portions of the lateral parts of
the framework. At 4 and 5, in Fig. 3, are 70
shown the forward edge members which
connect with the front end of the lower
edge member 1 at 6, and which diverge and
extend upwardly and at an inclination rear-
wardly. Similar rear edge members 7 and 75
8 are shown in Figs. 2 and 3 to be coupled
to the rear end of the lower edge member
1, and diverge upwardly and extend for-
wardly.
The front edge members 4 and 5 and 80
the rear edge members 7 and 8 of the cen-
tral portion of the tetrahedral framework
do not merge upwardly into a single edge
member, but the top prism of the tetra-
hedron is truncated, as indicated in Fig. 85
1, and the front edge members 4 and 5
are joined together by a horizontally ex-
tending tie-rod 9; while the upper ends of
the rear edge members 7 and 8 are simi-
larly connected by a horizontal tie-rod 10 90
running parallel with the tie-rod 9. The
left ends of the tie-rods 9 and 10, in Fig. 3,
together with the upper ends of the front
edge member 4 and rear edge member 7,
are connected to another horizontal tie-rod 95
11. At 12 is shown a tie-rod parallel to the
tie-rod 11, and serving to join the right-
hand ends of the tie-rods 9 and 10 and the
upper ends of the front edge member 5 and
rear edge member 8. These several tie-rods 100
9, 10, 11 and 12 provide a horizontal frame
forming the upper end of the central tetra-
hedral part of the machine framework.
A series of struts 13 are connected between
separated and preferably equidistant points 105
14 and 15 along the forward edge member
4 and horizontal tie-rod 9; and a similar se-
ries of struts 16 are coupled between the1;294,774.
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Critchett, J. C. Flying Machine, patent, February 18, 1919; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1259430/m1/3/: accessed June 23, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.