Improvements in the Manufacture of Ventilators for Oven Doors and other like Uses.
Year: 1888

page_text: Date of Application, 23rd Oct., 1888
Complete Specification Left, 19th July, 1889-Accepted, 31st Aug., 1889
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Ventilators for Oven Doors and
other like Uses.
I, CHARLES JAMES HARCOURT of the firm of R. and C. Harcourt and Son, of 223
Moseley Street, Birmingham, in the County of Warwick, Brassfounder, do hereby
declare the nature of this invention to be as follows:-
My invention relates to that class of oven door and other like ventilators which are
opened and closed by the use of a disc or valve moving on a centre through part of a
circle, and consists in manufacturing such class of ventilators of wrought or rolled
metal in lieu of making them of cast metal as heretofore.
The outer brass cap is made in a press by means of cutting out and stamping dies
of the kind ordinarily used in the working of metal. In this cap, preferably at a
point between its centre and the inner edge of the ventilating openings, a slot is
made.
The moveable plate is also made in a press. I raise thereon a protuberance,
technically known by mechanics as a "teat," which occupies such a position upon the
plate, relatively to the slot in the cap, that, when the one is superimposed on the other,
the teat may be made readily to enter the slot. For the purpose of this invention it
is necessary that the teat shall bo less than the slot, so that it shall, by a partial revo-
lution of either the cap or the plate, be capable of traversing the length of the slot.
Such partial revolution is accomplished by use of a thumb bit. The measure of the
slot and the distance to be traversed are regulated by the distance it is requisite to
move the plate in order either to cover the ventilating holes in the cap, or to open
them.
It is obvious that if a teat were made on the inner side of the cap to fall into a slot
on the plate, the same result would be accomplished.
It is also obvious that it is possible to vary the position of the slot and teat within
the circumference of the plate, or to substitute a notch made in the periphery of
the plate and a teat on the inner side of the plate, and accomplish the object
desired.
It is also obvious that a teat may be made by inserting a beg in the plate which
shall fall into the slot in the cap, or vice versa.
But, whatever positions may be chosen for the teat and slot, or notch, I, according
to my invention, make a teat, by pressure, out of the body of the metal, or by the
insertion of a separate piece of metal, and I form a slot, or notch by cutting out, in
lieu of producing the teat and slot or notch, as heretofore, by casting them in
cast metal.
In order to secure a closer contact between the underside of the cap and the upper
surface of the plate, than can be done with facility when flat surfaces are employed,
I sometimes, according to my invention, press these two surfaces so that they form
a curved section.
Dated this 23rd day of October 1888
CHARLES JAMES HARCOURT.
By Harris & Mills,
23, Southampton Buildings, Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Ventilators for Oven Doors and
other like Uses.
I, CHARLES JAMES HARCOURT, of the firm of R. and C. Harcourt and Son, of 223
Moseley Street, Birmingham, in the County of Warwick, Brassfounder, 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 relates to that class of oven door and other like ventilators which are
opened and closed by the use of a disc or valve moving on a centre through part of a
circle, and consists of improvements in manufacturing such class of ventilators of
wrought or rolled metal.
The outer brass cap is made in a press by means of cutting out and stamping dies
of the kind ordinarily used in the working of metal. In this cap, preferably at a
point between its centre and the inner edge of the ventilating openings, a slot is
inade.
The moveable plate is also made in a press.
I raise thereon a protuberance,
technically known by mechanics as a "teat," which occupies such a position upon the
plate, relatively to the slot in the cap, that, when the one is superimposed on the other,
the teat may be made readily to enter the slot. For the purpose of this invention,
it is necessary that the teat shall be less than the slot, so that it shall, by a partial revo-
lution of either the cap or the plate, he capable of traversing the length of the slot.
Such partial revolution is accomplished by use of a thumb bit. The measure of the
slot and the distance to be traversed, are regulated by the distance it is requisite to
move the plate in order either to cover the ventilating holes in the cap, or to
open them.
It is obvious that if a teat were made on the inner side of the cap to fall into a slot
on the plate, the same result would be accomplished.
It is also obvious that it is possible to vary the position of the slot and teat within
the circumference of the plate, or to substitute a notch made in the periphery of the
plate and a teat on the inner side of the cap or body, and accomplish the object
desired.
It is also obvious that a teat may be made by inserting a peg in the plate which
shall fall into the slot in the cap, or vice versa.
But whatever positions may be chosen for the teat and slot or notch, I, according
to my invention, make a teat by pressure out of the body of the metal, instead of by
casting, or by the insertion of a separate piece of metal, and I form a slot or notch
by cutting out by means of dies, in lieu of producing the slot or notch, as heretofore,
by casting or by filing.
In order to secure a closer contact between the underside of the cap and the upper
surface of the plate than can be done with facility when flat surfaces are employed,
I sometimes, according to my invention, press these two surfaces, so that they form a
curved section.
And in order that my invention may be more clearly understood, and readily
carried into effect, I will proceed, aided by the accompanying drawings, more fully to
describe the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a cross section
according to my invention.
and Figure 2 is an edge view of a ventilator constructed
Figure 3 is an interior view, and Figure 4 is a section on
the line 1. 1. of figure 3, of the cap separately, and Figures 5 and 6 are respectively
Land rose coation of the moveable nato canoratoly

page_text: modification. In all the figures like parts are indicated by similar letters of reference.
a is the outer brass cap or body of the ventilator, which is made in a press by means
of cutting out and stamping dies of the kind ordinarily used in the working of metal.
In this cap, preferably at a point between its centre and the inner edge of the
ventilating openings a, a slot a² is made; a circular hole as is also made in its centro,
to permit the passage therethrough of the shank of the thumb bit c, and holes a¹ are
formed near the outer edge of the said cap or body a, to permit of the same being
secured in position by screws passing through such holes a. The openings a¹, slot a³,
and holes a, a, are all formed at the same operation of stamping or cutting
out.
.
The moveable plate b and the ventilating openings b¹ therein, are also made in a
press by means of cutting out and stamping dies, and according to my invention, I
raise thereon a protuberance 6, technically known by mechanics as a teat," which
occupies such a position on the plate b, relatively to the slot a² in the cap or body a,
that when the one is superimposed on the other, the teat 62 may be made readily to
enter the slot. The plate b is also formed with a central slot 6 to receive the shank
of the thumb bit c. The teat 62 is made less than the slot a², so that it shall, by
a partial revolution of the plate b, be capable of traversing the length of the
slot.
.
Such partial revolution of the plate bis accomplished by use of a thumb bit
which is preferably made by stamping the same out of sheet metal; in fixing said
thumb bit c to the plate b, a washer d is first placed between it and the cap or body a,
the plate b is then placed on the shank c' of the thumb bit c and on the inner face of
the cap or body a, and a washer e is placed on the end of the shank c¹ and on the inner
face of the plate b, the end of the shank of the thumb bit is then upset or rivetted
over on to the washer e.
It is obvious that if a teat a were made on the inner side of the cap or body a, as
represented at figure 7, to fall into a suitable slot formed in the plate, the same result
would be accomplished.
It is also obvious that it is possible to vary the position of the slot a² and teat b
within the circumference of the plate b, or to substitute a notch 63 made in the
periphery of the plate band a teat a in corresponding position on the inner side of
the cap or body and accomplish the object desired.
It will be seen that the cap or cover a is made of one piece of sheet or rolled metal
pressed or stamped to the required form.
In order to secure a closer contact between the underside of the cap or body a and
the upper surface of the plate b than can be done with facility when flat surfaces are
employed, I prefer, according to my invention, to press these two surfaces so that they
forin a curved section, as shown in the drawings, but, if desired, the curve of such
parts may be increased, or they may be made flat.
b
If desired the plate 6 may be applied to the exterior of the body a.
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
1. In ventilators for oven doors and other like uses, a cap or body a formed of a
single piece of sheet metal with the required apertures therein, by means of cutting
out and stamping dies, substantially as herein shown and described.
2. In ventilators for oven doors and other like uses, constructing a teat in either
the cap or body a or in the plate b, by pressing the same out of the material forming
such parts, substantially as herein shown and described.
Dated this 19th day of July 1889.
CHARLES JAMES HARCOURT.
By Harris & Mills,
23, Southampton Buildings, Agents.