A Process for Hardening the Surface of Revolving Bodies, such as Mangles, Balls, Calender Rollers, and the like
Year: 1890

page_text: Date of Application, 28th Oct., 1890
Complete Specification Left, 25th July, 1891-1ccepted. 19th Sept., 1891
PROVISIONAL SPECIFICATION.
A Process for Hardening the Surface of Revolving Bodies, such as
Mangles, Balls, Calender Rollers, and the like
I, CARL WILHELM MODEL of 114 Silberburgstrasse, Stuttgart, in the Empire
of Germany, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
The object of this invention is a process for giving revolving bodies whose
surfaces are exposed to outer pressure and cannot be replaced by metal, a hard
surface from the first in order to obviate the drawback that such bodies only get
sufficiently hard by degrees and therefore often lose in shape.
The process is in the main as follows:
The wood cylinder to be treated is set in rapid rotation between the points of a
lathe, and a blunt tool, or preferably a roller is firmly pressed against the cylinder
so as to cut for about 1 millimetre into the cylinder. Subsequently the support is
guided along the latter. Thereby the outer region of the surface of the wood is
rendered denser and a hard but elastic surface produced, if required by repetition
of the said process.
Dated this 28th day of October 1890
HUELSER & Co.,
Agents for Applicant.
COMPLETE SPECIFICATION.
A Process for Hardening the Surface of Revolving Bodies, such as
Mangles, Balls, Calender Rollers, and the like.
1, CARL WILHELM MODEL of 114 Silberburgstrasse, Stuttgart, in the Empire
of Germany, Manufacturer, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention has for its object to condense the surface regions of wooden objects,
especially revolving bodies, for instance mangles, calender rollers balls etc. and
thereby to produce an elastically hard surface.
It is a known inconvenience, that rotary wooden bodies, such as rollers, balls etc.
are apt to receive impressions especially as long as they are new. Mangle rollers
for instance receive even the design of the mangled linen. Said inconvenience
gradually vanishes by the rollers becoming by degrees harder at their surface.
My improved process consists in giving the rollers from the first an elastically
hard surface and is carried out as follows, reference being had to the accompanying
drawing in which
Fig. 1 is a front view and
Fig. 2 an end view, of a wooden roller showing the hardening tool as applied
thereto.
a,
The wooden body A having been set in rapid rotation between the points of a
latke or of any other suitable contrivance, a blunt tool, but preferably a roll is
firmly pressed on and moved to and fro by means of the support of the lathe in the
same manner as the turning of wooden bodies is effected except that as mentioned
above a roll or blunt tool is employed in lieu of the sharp turning tool. The
success attained by the improved process is surprising. Experiments made with
mangle rollers by the "Royal Institute for Examining Material" at Stuttgart
showed that the impression produced on a hardened roller was only one sixth of

page_text: that on an unhardened roller and disappeared again directly after removal of the
charge, while the impression on unhardened rollers was lasting.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
The method of condensing the surface regions of objects of wood especially of
rotary bodies such as mangles, calender rollers, balls and the like and of producing
thereby an elastically hard surface consisting in firmly pressing a blunt tool or a
roller (a) against the wooden body (A.) set in rapid rotary or sliding movement
and moving the tool to and fro according to requirement, substantially as set
forth.
Dated this 21th dor of July 1801
CARL WILHELM MODEL,
By Huelser & Co.,
His Agents.