Improvements in Hardened and Tempered Cast Steel Needle Pointed Teeth Used in the Manufacture of Silk Combs Employed in the Dressing of Waste Silk.
Year: 1886

page_text: Date of Application, 12th May, 1886.
Complete Left, 11th Feb., 1887.
Complete Accepted, 11th Mar., 1887.
Improvements in Hardened and Tempered Cast Steel Needle Pointed
Teeth Used in the Manufacture of Silk Combs Employed in the
Dressing of Waste Silk.
We, LOUIS EDMUND PRIESTLEY and GEORGE FREDERICK PRIESTLEY trading as
Edmund Priestley of Hope Street Mills, Halifax, Yorkshire, Silk Comb Makers, do
hereby declare the nature of this invention to be as follows
:-
Hitherto it has been customary to temper the entire tooth of silk combs so that the
temper was uniform throughout, but according to our Invention we temper the teeth
in such a manner as to leave the points of the teeth glass hardened, or at least much
harder than that portion of wire below the elbow or bend of the tooth, whereby the
teeth will be far more durable than those at present in use, and which are made of one
uniform temper.
Several means or methods may be employed to temper the teeth unequally as above
set forth, but we find the following to be an useful method.
After the teeth have been hardened in a bath of oil or water in the ordinary
manner they are placed upon suitably constructed steel plates which are placed over
an oven, so that when the plates get hot they impart their heat to the teeth placed
upon them.
The teeth are placed upon the plates in such manner that the points thereof over-
hang the edge of the hot plates, consequently the point of the teeth is not heated as
high as the wire below the bend, by which means we accomplish the desired result.
The temper given to such teeth can be regulated to a nicety, as the operator can see
the steel change color with the heat, and, when the color has risen high enough up the
teeth, they are placed on one side as finished..
TASKER & CROSSLEY,
Commercial Street, Halifax,
Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Hardened and Tempered Cast Steel Needle Pointed
Teeth Used in the Manufacture of Silk Combs Employed in the
Dressing of Waste Silk.
We LOUIS EDMUND PRIESTLEY and GEORGE FREDERICK PRIESTLEY trading as
Edmund Priestley of Hope Street Mills, Halifax Yorkshire Silk Comb Makers 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
Our invention has reference to hardened and tempered cast steel pointed teeth which
have hitherto been tempered throughout the whole tooth, so that the temper was
uniform but according to our invention we temper the teeth in such a manner as to
leave the points of the teeth glass-hardened or at least much harder than that portion
of the wire below the elbow or bend of the tooth; whereby the teeth will be far more
durable than those at present in use and which are made of one uniform temper.
Several means or methods may be employed to temper the teeth unequally as above
set forth, but we find the following to be a useful method.
After the teeth have been hardened in a bath of oil or water in the ordinary manner,
they are removed from the said bath and placed upon suitably constructed steel plates,
which are placed over a hot oven so that when the plates get hot their heat is imparted
to the teeth placed upon them. The teeth are placed and arranged upon the plates
with their points overhanging the edge of the hot plates, consequently the points of
the teeth are not heated to the same degree as the wire below the bend, by which
means we accomplish the desired result,
The temper given to such teeth can be regulated to a nicety, as the operator can see
the steel teeth change colour with the heat, and when the colour has risen high enough
up the teeth, they are removed and placed on one side as finished.
Having now particularly described and ascertained the nature of our said invention,
and in what manner the same is to be performed, we declare that what we claim is :-
:-
The manufacture of hardened and tempered cast steel-needle-pointed teeth, where
the points thereof are purposely made harder than that portion of the wire below
the bend.
TASKER & CROSSLEY,
Halifax, Agents.