Apparatus and Process for Manufacturing Chair Seats.
Year: 1899

page_text: Date of Application, 22nd July, 1899 -Accepted, 26th Aug., 1899
COMPLETE SPECIFICATION.
Apparatus and Process for Manufacturing Chair Seats.
I, CHRISTIAN LINGENBERG, Bahnhofstrasse, Hottenheim-on-the-Rhine, Ger-
many, Chair 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:-
It is well known that wooden seats of chairs have heretofore been made of
several thicknesses of veneer laid one upon another and glued or otherwise stuck
together.
The object of the present invention is to prevent such seats from twisting or
warping and at the same time facilitate the pressing into shape of the seat.
These veneer seats present the serious disadvantage that when exposed to the
slightest damp, the layers of wood become separated from one another, so that
the seat after a short time becomes useless. They moreover, possess very little
power of resisting injury from outside violence, being easily broken through if
trodden upon by the foot for example. In chair seats made according to the
present invention these objections are overcome.
In contrast to these heretofore in use my improved chair-seat is made in one
piece whereby greater durability is obtained.
this invention is the saving of material, glue, workman's wages, ete.
A still more important feature of
According to my invention the board, out of which the seat is to be made is
first boiled or steamed for about twenty minutes in alum or other solution which
has the property of making the wood elastic and pliable. The board is then
pressed, by means of the press shown in the accompanying drawing, between con-
cave and convex plates, by which the desired arching or hollowing is obtained.
As may be seen from the drawing, the lower press plate b is made concave and
the upper press plate a convex.
channels c, which meet in a central hollow or depression d.
The lower press plate has a number of radial
These channels are intended to carry away the moisture exuded during the
pressing process, completely dry boards being taken from the press. Of course
the press-plates a and b can be made of zinc or other suitable material and so
arranged as to be interchangeable or to take in and out.
The wooden seat can be perforated or impressed with any desired pattern or
design. The seats made according to the present process possess the advantage
of being quite unaffected by moisture, and do not crack or come to pieces after
being washed.
Having now particularly described and ascertained the nature of the said
nvention, and in what manner the same is to be performed, I declare that what
claim is:-
First. The process for making chair seats in one piece, which consists in first
teaming or boiling the wood in alum or other similar and suitable solution then
ubjecting the wood to pressure and conducting away the exuding moisture by
means of suitably formed press plates, substantially as described.
Second. A press for carrying out the process for making chair seats referred to
D

page_text: in the first claiming clause hereof the press plates being provided with radially
arranged conducting channels which meet in a drain or opening whereby mois-
ture is permitted to flow away, substantially as described with reference to the
drawings.
Date vuay of try
CHR. LINGENBERG,
Per W. H. Beck,
Agent, 115, Cannon Street, London, E.C.,