Year: 1887

page_text: I, ABRAHAM HUN BERRY, of Boston in the County of Suffolk and State of
Massachusetts, United States of America, Engineer do hereby declare the nature of this
invention and in what mauner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The object of my invention is to so construct-form, and arrange the blades of
an air wheel or pump that in their rotation no counter or interfering currents can
have place, and that the whole energy of the machine can be devoted to moving a mass
of air in the direction required.
This object I attain by the mechanism shown in the accompanying drawings in
which
Figure 1 is a perspective view showing one of my air wheels complete; and
Figure 2 is a view in perspective more clearly showing the form and arrangement
of one of the blades and its connection with the run and hub.
Figure 3 is an elevation of the front face of the wheel.
Figure 4 is an elevation of the rear face of the wheel.
Figure 5 is a section through y z of Figure 3.
Figure
Figure
6 is a section on line UX of Figure 5.
7 is a section on line V X of Figure 5.
Figure 8 is a section on line S x of Figure 5.
Figure 9 is a section on line F F of Figure 5.
In the drawing, Figure 1, I have shown the air wheel with five blades although the
number of blades may be varied to suit the particular conditions under which the
device is to be used.
That part of the wheel which serves as a framework for holding the blades C
consists of a hub B, in this case said hub has five curved tangential faces T-
- T

page_text: 1
to which faces the inner ends of the curved radial arms R ------R are attached by
means of bolts or other suitable fastenings. The outer ends of the radial arms R. R
are secured to the rim A:
In the wheel shown, the radius of the arms R
same, as that of the rim A.
-----
----
R is the same or about the
------
- R,
The blade proper C is a compound warped surface having three edges two of which
ddd, eee, Figure 2 are in the plane of the rim and radial arms, R.
while the third edge k, is in a plane at about right-angles to the face of the
wheel.
The surface of the blades at the edges d d d, eee are made to fit the radial arms
and the rim and the edge kkk serves to gather the air into the wheel.
The three edges d d d, e e e and k, ¹² are connected by easy curves which gives to
the body of the blade a warped or concavo convex form as shown in 6, 7, 8 and 9
which are sections drawn through different parts of the blade.
It will be seen upon inspection of Figures 3 and 4, that the outer portion of the
blade from H to X is curved, beginning at the point H on the edge of the blade,
tangent to an are described by the radial H L, thence curving backward to the point X
and meeting the rim of the wheel.
Between the points H and k, Figure 5, the curves of the blade all begin at the
front edge, tangent to arcs described by radii from the axis of the wheel L, and
gradually changing in curvature, at last coincide with the circular rim of the wheel
which will be the arc or circle described by the radial of the wheel.
Between H and P, Figure 5, the curves are more clearly shown by sections of one
of the blades of my wheel taken on the lines U X, V X, SX and F, F, Figure 5.
The curves beginning at the points U. V. and S at the front of the blade, are also
tangent to arcs described by radii from the axis of the wheel, and curve to the rear to
the common point X which is the point where the top edge e é e and the rear edge ddd
of the blade meet.
Figure 9 shows the curve of the blade on the line F. F. which is parallel to S X.
The curves shown in Figures 6, 7, 8 and 9 are of a parabolic nature with their
vertices at the front of the blade, are of different degrees of curvature, and the uniting
of them by curved lines will make a blade which can be described as a compound
warped or concavo convex form.
In my drawings I have shown the front or air gathering edge k k¹ k² in a plane at
right angles to the rear face of the wheel, but it may be made at any angle by adding
to or diminishing the distance between X and T. Figure 3, as it may be desirable to
diminish or increase the size of the passage between the blades without changing the
number of blades.
In either case the front or air gathering edge kkk² of the blade should be tangent
to the circles of rotation of the said front edge.
The shape of the gathering edge of the blade kkk viewed in profile as in Figure 5,
is not material to the efficiency of the wheel, except as it will give a larger or
smaller area of inlet, but as viewed at right angles to that position it is essential
that this edge shall be at all points tangent to the circles of rotation or path
described by the gathering edge around the axis of the wheel, and not be merely at
right angles to the front of the blade: for if the distance from the point J to X be
diminished and the points & and P. remain as they are shown, the front or gathering
edge can be at right angles to the front of the blade, but it will be angular to its
direction around the axis of the wheel, and cause the blade to drag through the air.
If the distance from J to X be increased the points k and P, remaining as they are
shown, the edge can still be at right angles to the front of the blade, the tendency
then will be to deflect the air outward and away from the following blade: but if
the gathering edge is tangential to its direction around the axis of the wheel the
distance from J to X may be increased or diminished, yet a cutting edge will always
be presented to the air, thus causing the least disturbance, and the curved body of the
blade will carry the air through the wheel without the violent changes of direction
which have so retarding an effect on air in motion.

page_text: Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed I declare that what I claim is ;-
First A ventilating wheel having blades made from triangular blanks secured at
two of their edges and bent substantially as described so that no part of their surface
is plane.
:
Second A ventilating wheel made up of blades having two edges secured in the
plane of the rear face of the wheel and bent substantially as described, so that any
line drawn upon the surface of the. blade from the rear to the front edge will be
curved.
Dated this Twelfth day of September 1887.
ABRAHAM HUN BERRY.
Haseltine, Lake & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.