Todays patent is the third of Hagenlocher’s four airship patents
issued in the U.S.
The avowed purpose of the patent is to eliminate the requirement
for mobile or stick-masts at secondary landing sites. Although discussed
in the patent, none of the approved claims indicate that this supporting
frame might be removable.
The patent doesn’t discuss, and no claim indicates, how far the frame
might be from the longitudinal center of the airship. (Assuming the ship
is anchored so that it rotates about this frame, the net “weathervane”
rotational force decreases the closer the frame is to the body midpoint.
No turning/restraining force other than the wind is mentioned.
The remaining 22 of the 23 approved claims descend directly, or
secondarily, from the first claim:
“An airship construction comprising a supporting frame including
sets of cross-ribs and longitudinal beams interconnecting said sets
of cross-ribs at respective nodes, each of said sets of cross-ribs
defining a cross-plane perpendicularly to a longitudinal axis of said
airship, a gondola secured to said supporting frame, a bi-pod landing
gear including at least two landing wheels and an anchoring device,
a wheel mounting for each of said landing wheels, each wheel
mounting comprising a triangular truss frame, both truss frames
being positioned in one cross-plane of said cross-planes, said one
cross-plane being positioned forward of an aerodynamic center of
wind pressure of said airship construction, each truss frame
comprising a portion of said airship construction forming a first
triangle side and two connecting elements forming second and
third triangle sides interconnected to form an outer triangle
corner opposite said one triangle side, each of said at least two
wheels being connected to a respective outer triangle corner,
said two connecter elements being pivoted to ends of said first
triangle side so that a triangle plane of each triangular truss
frame coincides with said one cross-plane, and an anchor
mounting securing said anchoring device to a floor of said
gondola in an area of said one cross-plane.
Don’t blame the inventor, this is a typical "Patent-speak" claim sentence.
Claims 2 through 8, 10, and 21 through 23 expand (or limit) Claim 1.
Claim 9 modifies Claim 8 (the wheels may castor).
Claims 11, 12, and 16 modify Claim 10 (which introduces the ground
In turn they are modified as follows:
Claim 11 by Claims 14 and 15,
Claim 12 by Claim 13, and
Claim 16 by Claims 18, 20 and 17 (which is modified by Claim 19).
This patent is referenced by three subsequent U.S. patents:
6,286,783 (Kuenkler) Aircraft with a fuselage substantially
designed as an aerodynamic lifting body,
6,311,925 (Rist) Airship and method for transporting cargo,
7,500,638 (Colvin) Heavy lift airship.