Improvements in or appertaining to Rotary Fans or Air Propellers.
Year: 1895

page_text: Date of Application, 22nd Jan, 1896
Complete Specification Left, 22nd Oct., 1895-Accepted, 23rd Nov., 1895
Date of application
Complete Specification Left, 22nd Oct., 1895-Accepted, 23rd Nov., 1895
Improvements in or appertaining to Rotary Fans or
Air Propellers.
I, JOHN WALTER GIBBS of the Firm of John Gibbs and Son of 27 South John
Street, Liverpool in the County of Lancaster, Ventilating Engineer, do, hereby
declare the nature of this invention to be as follows:-
-
This invention relates to an improved form of boss or centre for rotary fans or
air propellers.
It is well known that in cases where fans are driven at high speeds, the strain on
the vanes or blades is very great, and as is often the case the vanes or blades work
loose from the centre or boss onto which they are secured.
The object of this invention is to overcome this difficulty, and by means of the
improved boss to securely lock the blades in position from which it is impossible to
work loose. The boss itself is split vertically into two disc-like halves, each of which
is formed into steps or sloping faces, which fit into one another as in the ordinary
bevel clutch coupling. One of the halves of the boss is provided on its inner face
with flangesiwhich run out radially between each of the steps or sloping faces, and the
other half boss has grooves or recesses into which these flanges fit, thus securely
locking the two portions together.
The vanes or blades which may be of any desired shape according to requirements,
are placed with their inner ends between the two halves of the boss. The end of
each blade will rest between two sloping faces, and will be further locked securely
in position by means of the radial flanges bounding its two edges. The two halves
containing the blades are fastened firmly together by set screws, bolts or the like
passing through the faces of the boss, and the blades are thus firmly locked in
position. It is found that the blades of a fan thus constructed are so firmly secured
that the above mentioned difficulty of the blades working loose is entirely done
away with.
In some cases I prolong the two halves of the boss circumferentially so as to
secure a better support for the blades.
Dated this 21st day of January 1895.
WM. P. THOMPSON & Co.,
Of 6 Lord Street, Liverpool, Patent Agents for the Applicant.
Improvements in or appertaining to Rotary Fans or
Air Propellers.
I, JOHN WALTER GIBBS of the Firm of John Gibbs and Son of 27 South John
Street, Liverpool in the County of Lancaster Ventilating Engineer, do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
This invention relates to an improved form of boss or centre for rotary fans or

page_text: It is well known that in cases where fans are driven at high speeds, the strain or
the vanes or blades is very great, and as is often the case the vanes or blades work
loose from the centre or boss onto which they are secured.
The object of this invention is to overcome, this difficulty, and by means of the
improved boss to securely, lock the blades in. position from which it is impossible
to work loose. In carrying same into effect, the boss itself is split vertically into
two disc-like halves A B, each of which is formed with steps or sloping faces, which
fit into one another as in the ordinary bevel clutch coupling. One of the halves
of the boss is provided on its inner, face with flanges, C, which run out radially
between each of the steps or sloping faces, and the other half boss has grooves or
recesses D into which these Hauges fit, thus securely locking the two portions
together
.
P..
i
The vanes or blades, which may be of any desired shape according to requirements,
are placed with their inner ends, between, the two halves of the boss. The end of
each blade will rest between two sloping faces, and will be further locked securely
in position by means of the radial flanges bounding its two edges. The two halves
containing the blades are fastened firmly together by set screws, bolts or the like
passing through the faces of the boss, and the blades are, thus firmly locked in
position. It is found that the blades of a fan thus constructed. are so firmly
secured that the above mentioned difficulty of the blades working loose is entirely
done away with.
In some cases 1 prolong the two halves of the boss circumferentially, so as to
secure a better support for the blades.
....
Referring to the drawings-
Figure 1 is a perspective view of a fan and frame, complete ;
Figures 2 and 3 side views of the two parts of the boss;
Figures 4 and 5 corresponding face views.
J... + 64
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
tuff
1. The improvement in or appertaining to rotary fans or air, propellers, which
consists in forming the boss in two parts having stepped faces and edge abutments
substantially as described.
2. In combination with stepped bosses in two parts, a locking devic
independent of the bolts, consisting of the radial flanges on the one part and
corresponding radial
esponding radial grooves on the other part, substantially as described.
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1
Dated this 21st day of October 1895.
WM. P..THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Patent Agents.