Improved Apparatus for Supplying Heated Air for Dessicating, Specially Applicable for Dental and Surgical Purposes.
Year: 1889

page_text: Date of Application, 12th July, 1889-Accepted, 7th Sept., 1889
COMPLETE SPECIFICATION.
Improved Apparatus for Supplying Heated Air for Dessicating,
Specially Applicable for Dental and Surgical Purposes.
L, THOMAS ROWNEY Dental Surgeon of 16 Savile Street Hull, do hereby declaro
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 consists of a hollow cylinder of Compressed Carbon which is filled
with short lengths of line iron wire tightly packed. This part I name the pyrophore or
heat bearer to one end of which is attached an adjustablo jet & a guard of ivory. To
the other end is fixed an air tube which is bent until it lays parallel with the carbon
cylinder, with a space of an inch or more between them. Near the middle of the
cylinder the tube is bent again at right angles, or at any angle greater or less than a
right-angle. To this is attached a hollow handle having at its upper end a piston
valve which can be moved by the forefinger & thumb while the instrument is
in use.
By the lower end connexion is made with the air vessel, which may be a resevoir &
bollows of india rubber, or any other rosevoir acted upon by any convenient force.
The handle by preference is made up of a layer of silica wool next the air tube then
a case of cork & over this a layer of wood or bone or ivory, or of all combined.
As the air passes through the handle before being heated the latter is kept cool.
The screws being interchangeable, the handle & jet can be attached to the pyrophore
in various ways yet no heat will pass through to the hand of the operator, & connexion
with the air resevoir is still made through the bent air tube.
In action the instrument is placed in the adjustable holder & the pyrophore is
suspended over the flame of a spirit lamp or of a Bunsen burner until sufficiently
heated. The heat being retained for a considerable time from the construction of the
pyrophore.
The stream of air when admitted, in its passage through the pyrophore is quickly
heated, & can be easily controlled by the piston valve.
The pyrophoro can be made of metal glass, graphite, terra cotta, fire clay, porcelain,
or any kind of earthenware glazed or unglazed & packed with rough lumps of
compressed carbon or metal wire of various kinds, or pumico, or combinations of any
of these or of any other materials capable of retaining heat & increasing the heating
surface within the cylinder & dividing and arresting the stream of air in its passage.
Of all these arrangements I give the preference to, the compressed carbon cylinder
filled with tightly packed fine iron wire, but I do not bind myself to these only.
Having now déclared the nature of my Invention I will describe it fully by reference
to the drawing.
Fig. 1. is the pyrophore in section. A is the carbon cylinder. B the short lengths
of iron wire. Care metal caps to wh. are attached respectively the air tube H &
the adjustable jet F. D is the adjusting nut. E is an ivory guard for preventing
contact with the lips or other parts. It is mounted on a split tube so that its position
can be changed if necessary. S S are connecting screws & are interchangeable.
J is the hollow handle through the air tube H is continued. K the layer of silica wool
surrounding it. L the layer of cork & wood or ivory. N metal washers for
retaining the handle in position on the tube. G is the ivory head of piston valve.
Y the elastic tube connecting the instrument with the air resevoir.
.
Fig. 2. shows the cylinder of pyrophore with rough lumps of compressed carbon P
within it.
Fig. 3. shows V the piston valve in detail. W is the circular channel & is shown
insail

page_text: Fig. 4 shows the handle J removed from its position in Fig. 1 & attached to the
pyrophore at C, the jet F being now attached to the handle J so that the instrument
can be held in the fingers as a pen, & having the piston heads..G conveniently placed
for regulation by the thumb & forefinger, leaving the other hand free to operate the
bellows. In this form the elastic air tube is attached to H. Fig. 1. at S*.
Fig. 5. is the holder. TT are channels in a metal tube which is fast to the slide U.
The channels receive the heads G G of the piston. The slide can be supported on
any suitable stand which will admit of adjustment so that the pyrophore can be raised
to a proper height while being heated.
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 !
claim is
1. "The pyrophore or heat bearer" made of compressed carbon & filled with fine
iron wire in short lengths in the manner described, of whatever shape it may be, &
whether portable or fixed.
2. "The principle involved in the.construction of the pyrophore or heat, bearer," viz.,
the increased heating surface within the vessel & division of the stream of air & its
application to dental & other surgical operations, whatever materials may be used, for
increasing the surface & dividing the stream of air.
3.
"
The hollow handle" made up of a layer or of layers of silica wool or of asbestos
or both & cork & wood or cork & ivory in whatever sequence they may be used &
however put together, or wood alone.
دو
4. The position in which the handle is placed with reference to the pyrophore,"
whether at "right angles to it or at any angle less or greater than a right angle,
or parallel to it.
5. "The piston valve" with its double head. & its position with or on the handle, as
shown in the drawing, or in any other position in which it can be moved by either
finger or thumb-or with both of the hand by which the instrument is held while
being used.
"
"
6. The holder so much of it as is shown in the drawing.
7. "The position in which the air resevoir is attached to the handle
"
or to the
metal air tube, so far as it provides for the passage of a stream of cold,air to keep the
handle & air tube from being heated.
Dated this Tenth day of July 1889.
THOMAS ROWNEY.