Improvements in Extracting Ventilators or Chimney Cowls.
Year: 1893

page_text: Date of Application, 12th Aug., 1893
Complete Specification Left, 11th May, 1894-Accepted, 7th July, 1894
PROVISIONAL SPECIFICATION.
Improvements in Extracting Ventilators or Chimney Cowls.
THOMAS WHITEHEAD, 17 Nile Street, and 58 Great George Street, Liverpool,
Ventilator and Chimney Cowl Manufacturer, do hereby declare the nature of this
invention to be as follows :-
My invention applies to "Improvements in Archimedean screw ventilators or
chimney cowls" with the object of obtaining greater extracting power than
hitherto (1) by reducing the weight of the working parts (2) by increasing the
driving power by employing a series of wind-chambers in connection with improved
driving vanes, hereinafter described.
The invention is best described by aid of the accompanying drawing representing
a side section.
On the end of the terminal shaft AI place bracket F carrying oil-box D and
bearing E in which runs the spindle L. Attached together to lower part of
spindle are an oil-box cover N and the Archimedean screw M M. The upper part
of spindle runs in bearing H and oil-feeder J supported by bracket K. The
oil-box G is attached to spindle and revolves with it. The small inner band P is
attached by supporting stays R R R to outer band Q to which are attached the
driving-vanes S S. The inner band P is slipped over oil-box G, and is secured
thereto by a bayonet joint. The body is so constructed as to allow a larger
Archimedean screw being employed than hitherto. The cap T is supported by
stays U U.
The mode of action is as follows:-
The wind-chambers C C are so arranged that more than one-third of their
number is acted upon by the outer wind from any quarter. These acting directly
upon a corresponding number of driving vanes, greatly increased power is thereby
obtained to propel the screw, and so create a much more powerful exhaust than
hitberto.
Did th
1000
COMPLETE SPECIFICATION.
Improvements in Extracting Ventilators or Chimney Cowls.
THOMAS WHITEHEAD, 103 Great George Street, Liverpool, Ventilator and
Chimney Cowl Manufacturer, 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 :-
My invention applies to improvements in or applicable to Archimedean screw
ventilators or chimney cowls, and has for its objects the following :-
(1) Increased driving power than hitherto.
(2) Greater exhaust of vitiated air, dust, smoke, etc.
(3) Better resisting power against eddy wind pressure in low situations.
(4) To be used either as an upcast or downcast ventilator accordingly as
equired.

page_text: The invention is best described by aid of the accompanying drawings in which
Figure 1 is a side elevation and Figure 2 section.
On the end of the terminal shaft A I place bracket F carrying oil-box D and
bearing E in which runs the spindle L. Attached together to lower part of spindle
are an oil-box N and the Archimedean screw M M. The upper part of spindle runs
in bearing H and oil-feeder J supported by bracket K. The oil-box G is attached
to spindle and revolves with it. The small inner band P is attached by supporting
stays R, R, R, to outer band Q to which are attached the driving sails S S. The
inner band P is slipped over oil-box G and is secured thereto by a bayonet joint.
The cap T is supported by stays U U.
The body B B is so constructed as to allow of a larger Archimedean exhaust fan
being employed than hitherto. The driving sails and exhaust fans are well secured
to the one spindle working in bearings E and H as herein before described.
Around body of ventilator are arranged a number of wind-passages C C.
The mode of action is as follows:-
The backs of the wind-passages sloping inwardly direct the outer wind force up
and under the driving sails, materially reducing friction by taking the weight of
spindle with parts attached off the bearings, and thus giving greatly increased
driving power to propel the large screw fans, and so constituting a much more
powerful exhaust than hitherto. By reversing the fan M M it will act as a
downcast ventilator.
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:
1st. The peculiar construction arrangement and combination of parts constituting
the Archimedean screw ventilator or chimney cowl, substantially as, and for the
purposes herein before described and illustrated in the drawings Figures 1 and 2.
2nd. The employment and arrangement of the wind-passages in combination with
the driving sails, substantially as, and for the purposes described.
3rd. The manufacture of ventilating or chimney cowls constructed and arranged
substantially as herein described.
Dated this Tenth day of May 1894.