and Apparatus for Hardening Card-teeth.
Year: 1897

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c. Act, 1883) as required by
the decision of the Law Officer of the 17th day of February 1898.
Date of Application, 20th Jan., 1897-Accepted, 29th May, 1897
Process and Apparatus for Hardening Card-teeth.
1, GUSTAV BOVENSIEPEN, Manufacturer, of Mettmann, in the German Empire,
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:-
This invention has for its object, to harden card teeth after their insertion into the
cardcloth, in order to increase their durability and efficiency.
For this purpose I cause the cardcloth to travel round a drum or roller, which is
hollow and kept cool by a continuous current of cold liquid, air, or other suitable
cooling medium
Underneath the roller there is a vessel containing a bath of suitable hardening
liquid or composition, and at the side of the roller there is mounted a heating
appliance adapted to produce a sharp flame acting on the extremities of the card
teeth during their passage. The said drum or hollow roller, the burner, the
hardening bath, and the driving gear are so arranged, that as the card cloth travels
round the said drum, the teeth pass first through the flame of the burner and then
through the hardening bath, which should be continually renewed, in order to
maintain a constant temperature. Only that part of each tooth which passes
through the bath will be hardened, while the rest remains unaltered.
In the accompanying drawing, Fig. 1 is a side elevation of a hardening apparatus
embodying my invention; Fig. 2 is a vertical section of the same, and Fig. 3 is a
plan. a represents the card teeth; b, the drumm or hollow roller; 7, the supply
pipe, and 6 the outlet pipe for the same; c, a flat flame burner; c, the supply pipe
for the same; d, the hardening bath, the outlet pipe for the same.
The liquid d serves to harden the card teeth by suddenly cooling the same, after
they have passed through the flame, and may consist of water or oil, with or
without suitable admixture, or of other liquids hitherto used for similar purposes.
The cooling or hardening liquid is preferably led from the supply pipe 1 through
the roller band thence through the connecting pipe 62 into the hardening bath, as
shown by the drawing; but, if desired, the roller and bath d may be fed with
cooling liquid independently of each other.
The trough containing the hardening bath has an inclined partition e, which
forms an overflow, and this partition may be adjustable in height, in order to vary
the level of the liquid according to the length of the card teeth which pass through
the same.
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 I am aware
that it has been previously proposed to harden card teeth after their insertion into
the cardcloth by first heating them at the extremities only while passing around a

page_text: roller and then passing them into a hardening bath, and I do not claim generally
such process but what I claim is:-
-
1. The process for hardening card teeth after their insertion into the cardcloth,
which consists in conducting the said cardcloth around a roller and exposing the
extremities of the card teeth during their motion, first to a heating device and then
to a hardening bath, the said roller being hollow and kept cool by water or other
suitable cooling medium, substantially as described.
2. The combination of appliances for hardening card teeth after their insertion
into the cardcloth, substantially as described with reference to the drawing.
Dated this 18th day of January 1897.
FAIRFAX & WETTER,
37 and 39, Essex Street, Strand, London, Agents.