IMPROVEMENTS IN APPARATUS FOR TEMPERING SAWS AND OTHER ARTICLES CAPABLE OF BEING
Year: 1866

page_text: LETTERS PATENT. to James Dodge, of Manchester, in the County of
Lancaster, Mechanical Engineer, for the Invention of "IMPROVEMENTS
IN APPARATUS FOR TEMPERING SAWS AND OTHER ARTICLES CAPABLE OF BEING
Sealed the 21st August 1866, and dated the 23rd February 1866.
PROVISIONAL SPECIFICATION left by the said James Dodge at the
Office of the Commissioners of Patents, with his Petition, on the
23rd February 1866.
I, JAMES DODGE, of Manchester, in the County of Lancaster, Mechanical!
Engineer, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN APPARATUS FOR TEMPERING SAWS AND OTHER ARTICLES CAPABLE OF
BEING TEMPERED BETWEEN TWO HEATED SURFACES," to be as follows:-
My Invention relates to apparatus whereby I am enabled to temper saws,
doctor blades, springs, and other articles capable of being tempered between
heated surfaces, and at the same time to correct the distortions caused by
hardening. To accomplish this I employ a metal block: provided with flues,
which are heated by a furnace beneath or by other convenient means.
Against a surface of this internally heated block the saw or other article is

page_text: placed, and is confined thereto by a plate forced forward by a cam or any such
suitable and ordinary contrivance until the necessary heat for tempering has
been imparted. In order to prevent the block becoming untrue on its surface
by the pressure exerted against it I apply internal stays. In the above case
it is supposed that the pressing plate derives heat from the block, but in some
cases the said pressing plate may be otherwise heated.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Dodge in the Great Seal Patent Office on the 23rd
August 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
DODGE, of Manchester, in the County of Lancaster, Mechanical Engineer, sends
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-third day of February, in the year of our
Lord One thousand eight hundred and sixty-six, in the twenty-ninth year of
Her reign, did, for Herself, IIer heirs and successors, give and grant unto
me, the said James Dolge, Her special license that I, the said James
Dodge, my executors, administrators, and assigns, or such others as I,
the said James Dodge, my executors, administrators, and assigns, should
at any time agree with, and no others, from time to time and at all times
thereafter during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for "IMPROVE-
MENTS IN APPARATUS FOR TEMPERING SAWS AND OTHER ARTICLES CAPABIE OF
BEING TEMPERED BETWEEN TWO HEATED SURFACES," upon the condition (amongst
others) that I, the said James Dodge, by an instrument in writing under my
hand and seal, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said James Dodge, do hereby declare the
nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement and accompanying Drawings, that is to say :-
My Invention relates to apparatus whereby I am enabled to temper saws

page_text: doctor blades, springs, and other articles capable of being tempered between
heated surfaces, and at the same time to correct distortions caused by
hardening. To accomplish this I employ a metal block provided with flues,
which are heated by a furnace or by other convenient means. Against a
surface of this internally heated block the saw or other article is placed, and
is confined thereto by a plate forced forward by a cam or any such suitable
and ordinary contrivance until the necessary heat for tempering has been
imparted. In order to prevent the block becoming untrue on its surface by
the pressure exerted against it I apply internal stays. In the above case it
is supposed that the pressing plate derives heat from the block, but the said
pressing plate may be otherwise heated.
In the accompanying Drawing Fig. 1 represents a side elevation of the
apparatus; Fig. 2 a cross section; and Fig. 3 a plan view. A framework
is formed by upright bars a tied together by transverse rods b, which are
provided with projections c, between which is placed the block d, against the
surfaces of which the saw or other article is to be pressed. This block is
formed with hollow parts e constituting flues, and the solid parts fact as
stays for the surfaces d. At 9, 9', are bars resting upon the block d at their
inward ends, and upon a portion h of the framework at their outward ends;
they are also prevented from moving sideways by guides i which project
above them, but they are free to slide longitudinally. To these bars are
attached plates k capable of being pressed forward by cams mounted upon
shafts m carried by the framework. The flues e are heated by placing them
in communication with an ordinary flue of a furnace, or by jets of gas or
other convenient means; the excentrics are turned by means of the levers m
and the plates k withdrawn from the block d. The saw or other article is
then placed upon one of the surfaces, and the plate k closed upon it, after
which the cams are turned so as forcibly to press the article between the
surfaces k, d, and it is there retained until by the experience of the workman
it is known to have acquired sufficient heat for the desired tempering.
According to the arrangement shewn the plates k derive their heat from, the
block d, but they may be heated separately by gas or other source of
heat. The required degree of heat having been imparted, the cams are
turned, the plate k drawn back, and the article removed. For bringing back
the plates d projecting hooks o are fixed thereto, against which the cams [
act when turned back. In order to assist the workman in adapting the saw
or other article pins p are placed loosely in the plates k, and forced forward
by springs q, upon these pins the article may rest, but they move back against
the force of the springs q when the cams come into action.

page_text: Having thus described and ascertained the nature of my said Invention,
and the manner in which the, same is to be performed, I desire it to be
understood that I claim, as secured to me under the above in part recited
Letters Patent, the use of a metal block provided with an internal beating,
flue or flues,, and between which and another surface the article to be
tempered is pressed, also constructing the said block with internal stays.
In witness whereof; I, the said James Dodge, have hereunto set my
hand and seal, this Twenty-second day of Aug., in the year of our
Lord One thousand eight hundred and sixty-six.
JAMES DODGE. (L.S.)