an improvement in the Construction of impression Trays Ior Dental and other Purposes.
Year: 1885

page_text: an improvement in the Construction of impression Trays Ior
Dental and other Purposes.
THOMAS WALTER FARADAY ROWNEY of 31 Hartington St & Gordon House
St Peter's Church Yard Derby Dental Surgeon does hereby declare the nature of
the invention for IMPRESSION TRAYS FOR DENTAL & OTHER PURPOSES to be as
follows:-
The Impression Trays of whatever shape are formed of two or more plates of
metal or other materials so as to form a series of closed chambers marked in the
drawings K L M extending between the sides, front, & base of the Tray &.
communicating with each other, so that a stream of water can be made to circulate,
entering by the pipe J passing through K L M & flowing out by the tube N. By
this means hardening the composition used for taking the impression without the
water escaping into the mouth. The water being carried to the spittoon by an
elastic tube attached to N.
I prefer to make the water circulate through chambers as described but I can
also make it circulate through a convoluted tube either enclosed between the metal
jackets or attached to the upper or lower jacket of the Tray. This applies to Trays
for upper & lower impressions partial or complete.
г

page_text: An Improvement in the Construction of Impression Trays for
Dental and other Purposes.
THOMAS WALTER FARADAY ROWNEY residing at 31 Hartington Street, Derby,
in the County of Derbyshire, Dental Surgeon, I do hereby declare the nature of
my invention for IMPRESSION TRAYS 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 improvements in Impression Trays for Dental and other
purposes.
The objects of my improvements are to provide a tray of thin metal or other
suitable material of two or more plates with chambers between these plates
communicating one with another and extending between the sides, front, and
base of the Tray, through which cold water can be made to circulate, so as to cool
and harden the warm and soft material used for taking the impression of the
mouth very quickly (without the water escaping into the mouth) at the same time
getting a more perfect impression than with the old plan, with less discomfort to
the person operated upon, and with less liability to produce sickness.
I attain these objects by the instrument illustrated in the Drawings annexed
hereto which comprise:
A general view of the under side of a Tray for the upper jaw. The chambers K.
L. M. are indicated, and the tube that conveys the water to the chambers. The
arrows show the direction in which the water travells.
The dotted lines show the positions of the four sections.
The section through the central line A. B. shows the tubes and chambers.
Section through C. D. shows the chambers and the passage between the
chambers L and M.
Section through E. F. shows the chambers and the end of the tube J.
Section through G. H. shows the chambers, the tube J, and the passage between
the chambers K and L. on either side of the tube J.
Similar letters refer to similar parts throughout the several views.
The Tray is made of metal or other suitable material. The water for cooling is
contained in a reservoir and is conveyed to the Tray through an elastic tube which
slips on to the swelling at the.end of the metal tube J.
The water shall be controlled by a tap in the elastic tube near to the tray.
The water flows through the tube J and fills the chamber K, divides and passes
right and left, in the direction of the arrows through a hole on either side of the
tube J-shown in the section G. H-into the chambers L, L, following the arrows
into the chamber M, where the two streams meet and pass into the tube N and is
carried away by another elastic tube which slips on to the swelling on the tube N
-without escaping into the mouth-to a saliva ejector, spittoon, or other
receptacle.
The tubes J and N may either run along the upper and under surfaces of the
handle as shown in the drawings or along either edge of it.

page_text: I prefer to make the water circulate through chambers as described, but, I can
also make it circulate through a convoluted tube either enclosed by the metal
jackets, or attached to the upper or lower jacket of the tray.
The Drawings are of an Impression Tray for the upper jaw, but this same
principal may be applied to trays for the lower jaw, or partial trays, in like
manner.
"
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: "
An Impression Tray for either upper or lower jaw for Dental and other purposes
made of two or more plates with a series of chambers between these plates,
communicating one with another, and extending between the sides, front, and
base of the tray, and formed in such a way as to ensure a stream of cold water
or other cooling medium circulating and passing over the whole of the inner
surfaces of these chambers, without escaping into the mouth of the person operated
upon.
Dated thin Onl
ML 1000