Year: 1896

page_text: I JAMES DUKE of Bethlehem Street, Grimsby in the County of Lincoln,
ironmonger do hereby declare the nature of this invention to be as follows:-
A "Tobin " tube or inlet ventilator of any required length having communication
with the outside air or any other convenient source of air supply is provided with a
valve or flap b, turning on a hinge or axle at its lower edge, by which means it can
be made to close entirely the air passage as shewn in Fig. 1, or to allow the same to
be open to any required extent within the limits of its proper motion, as shewn in
the Figure 3 of the accompanying drawing. To open and close the said flap ba
bandle c on the front of the tube is provided, turning on a short axle f which goes to
the inside of the tube, there being fixed on the same axle at right angles to it and
within the tube an arm d. A link or rod is attached by one end with a ball-&-socket
joint or any other joint that will allow of a similar freedom of motion, to the extremity
of the arm d, and by similar means by the other end to any convenient part of the
flap b, in such a position on each that when the handle c with the attached arm dis
turned on its axle the link e advances or withdraws the flap b, and thereby opens or
closes the air passage, substantially in the manner shewn on the drawing. The
Figures 1 and 2 shew the link e brought by the arm d to a position at or near a
perpendicular with the flap, in which position the flap is advanced and closed:
Figures 3 and 4 show the arm d moved away from this position, and the link
consequently inclined to one side, when the flap is withdrawn or opened. The
Figures 1 and 3 are transverse sections on a vertical plane of the ventilator as above
described: Figures 2 and 4 are front elevations with the front of tube (a) removed.
Dated this 26th day of August, 1896.
I JAMES DUKE of Bethlehem Street Grimsby in the County of Lincoln, ironmonger
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:-
I desire to adopt the drawings accompanying my Provisional Specification as the
drawings for this Complete Specification. Figures 1 and 3 on the said drawings are
sections of the ventilator on a vertical plane parallel with the direction of the
incoming current of air; the shaded parts shew the wall, into which the ventilator
may be fixed and the arrow in Fig. 3 shews the direction of the incoming air.
Figures 2 and 4 are elevations of the ventilator looking from the apartment towards
the ventilator, the front of the tube a being removed.

page_text: An inlet ventilator consisting of a passage or tube opening in an upward direction
into an apartment and known sometimes as a "Tobiu" tube and having communication
with the outside air or any other convenient source of air supply is provided with
a valve or flap b turning on a hinge or axle at its lower horizontal edge by which
means it can be made to close entirely the air passage as shown in Fig. 1, or to
allow the same to open to any degree within the limits of its proper motion on the
hinge or axle above named as shewn in Fig. 3. To open and close the said flap ba
handle c on the front of the tube is provided turning on a short axle f which goes
within the tube and which is perpendicular to the flap in its closed position. There
is fixed on the same axle and projecting at right angles from it within the tube an
arm d. A link or rod e is attached by one end with a ball-and-socket joint or any
other joint that will allow of a similar freedom of motion to the outer extremity of
the arm and by similar means to the flap b, the length of the said link or rod c
being the distance between the face of the flap b when closed and the outer end of
the arm d (where the link e is attached) when the two points of attachment to b and
to d are opposite to each other, & being perpendicular to b and d. The flap b is
closed when the link e is brought by the revolution of the arm d actuated by the
handle c to a position perpendicular with the flap b in its closed position as above
described and as shewn on Figures 1 and 2: it is opened when the link e is moved
away from that position as shewn on Figures 3 and 4.
Having now particularly described and ascertained the nature of my said Invention
and in what manner the same is to be performed I declare that what I claim is ;-
1. The valve or flap as applied to the above and similar ventilators, turning on
one edge to wit the lower horizontal, and closing the air passage, or when opened
allowing of an upward 'discharge of air through the ventilator substantially as above
described and as shewn on the drawings.
2. The method of opening and closing the above or any similar valve or flap in
ventilators by means of the revolving axle, cross arm, and connecting link as above
described and as shewn on the drawings.
Dated this 97th day of May 189Z
JOHN J. CRESSWELL,
Agent for James Duke.