Improvements relating to the Heating of the Dies of Hot Presses,
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements relating to the Heating of the Dies of Hot Presses,
I, ARTHUR TRUELOVE, of 57, Moore Street, City of Sheffield, 'Brass Founder,
do hereby declare the nature of my invention to be as follows:-
My invention relates to improvements in the method of heating the dies or
the slides carrying the dies or pressing tools of hot-presses, such for example
as are used by gilders, presses for plastic substances and the like, and which
have hitherto been heated by gas or the like applied to the outside.
It is usual in these machines to have an upper movable slide carrying the
top die, and a lower stationary die holder and dic, between which the article
or substance is placed to be pressed.
I propose to make the top and bottom die holders hollow, and to introduce
the flanie into the interior, and to enable the flame to burn and the gases to
escape, I provide suitable openings through the sides of the die-holders.
I connect a burner of the Bunsen type with each die, holder, and I supply
the air under pressure, so that the flame shall be made to impinge upon the
end of the holder or slide, and thus cause it to heat the die more effectually
than hitherto, with the least expenditure of gas.
41 BOLL
Ը
ROBT. F. DRURY, C.P.A.,
Agent for Applicant, Bank Buildings, George Street, Sheffield.
Improvements relating to the Heating of the Dies of Hot Presses.
I, ARTHUR TRUELOVE, of. 57, Moore Street, City of Sheffield, Brass Founder,
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 improvements in the method of heating the dies (or
the slides which carry the dies) of hot presses, such for example as are used'
by pressers of any plastic substance, pulp or the like, when forming the sub-
stance into a desired shape.
Hitherto such dies or tools have been heated by the application of gas jets
to the outside which system has many inconveniences.
My invention is illustrated by the annexed sheet of drawings in which
Fig. 1, is an elevation of the upper toolholder or die holder with a die in
position.
Fig. 2. section of same to show the interior.

page_text: It will be understood that the holder and die shown in the drawings is merely
an example of how my invention is carried into effect, as the formation of such
tools will naturally vary according to the size and shape of the work to be
pressed.
Pressing machines such as herein before described are usually made with a
vertically moving slide constructed to carry a die holder to which the remov-
able dies or pressing tools can be readily secured, and for various classes of
work these dies are required to be made and kept hot while in use in order to
produce the desired result.
A bottom die or bed plate which is supported directly under the top die must
also be made and kept hot, and I propose to accomplish this in both cases in
the following manner.
The die holder H, and the bed plate holder which is of similar construction,
are both made hollow, and the die D, (or the bed plate as the case may be) may
be secured to the holder by a screw thread as shown or by other means..
I introduce in any suitable manner into the end of the holder farthest from
the die or bed plate, the nozzle N, of a combined gas pipe G, and an air pipe A,
which constitute what is commonly known as a Bunsen burner the air being
preferably under pressure.
In order to protect the nozzle from the effect of the heat I may surround it
with a packing of asbestos or other refractory substance E.
To supply the flame from the nozzle N, with air to support combustion and
to provide for the escape of the products of combustion, I make a number of
openings or ports 1', through the wall of the holder, and to concentrate the
heat from the burner upon the central portion of the die or the bed plate, I use
a conical conductor C, which I find in practice answers the purpose satisfactorily.
The flame from the nozzle or burners is thus caused to impinge upon the
back of the die D, and of the bed plate, and to heat them quicker and more
effectively than has hitherto been possible, dispensing with the troublesome
outside gas jets, and combining cleanliness and compactness.
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:-
1st The method of heating the dies, bed plates, or like pressing tools of
hot-presses, as herein before described and set forth."
2nd A die holder for hot-presses provided with a Bunsen burner, the nozzle
of which projects into the interior of the holder, so that the flame issuing there-
from will impinge upon the back of the die or pressing tool as herein before
described.
3rd A hollow die holder for hot-presses, provided with a so called Bunsen
burner in the interior, ports for the admission of air and the escape of gases;
and a conical flame conductor for the purpose of concentrating the flame upon
the back of the die, as herein before described and shown.
Dated the 31st day of January 1900.
ROBT. F. DRURY, C.P.A.,
Applicant's Agent.