Improved Apparatus for Cutting Grooves and Channels in Wood...
Year: 1890

page_text: Date of Application, 17th Mar., 1890
Complete Specification Left, 10th Jan., 1891-Accepted, 28th Feb.,
1891
.
PROVISIONAL SPECIFICATION.
· Improved Apparatus for Cutting Grooves and Channels in Wood...
I, EWALD MÜLLER, of Sorau, in Silesia, German Empire, Locksmith, do
hereby declare the nature of the said invention for "IMPROVEMENTS IN WOOD-
WORKING MACHINERY" to be as follows:-
This invention comprises means of producing grooves or channels of varying
depth in wood, and regulating the longitudinal and vertical dimensions of such
grooves or channels with mathematical accuracy.
The cutting tool is fixed in the bottom end of a flat bar or plate of steel or
metal, which is formed with a rack on one of its edges.
This bar or plate is fitted about the centre of an oblong framework, which is
provided with clamps or jaws at each end, for securing it in place on the piece
of wood or material to be operated upon.
One or both of the side bars constituting this framework is or are made with
a screw thread, passing through matrices in the end bars, so that the position
of the centre part, in which the cutting tool is fixed, may be regulated longi-
tudinally by a hand-wheel or handle at one end.
The cutting tool is thus capable of being drawn backwards and forwards over
the work as, desired, without risk of, disturbing its centre of motion.
A small pinion is mounted on an upright side plate, and worked by a handle
outside. This pinion is in gear with the rack, for regulating the upward and
downward motion of the cutting tool.
The flat bar or plate in which the cutting tool is fixed, is provided with a
properly figured scale,, on one or both sides, so that the depth of the groove
channel to be cut may be adjusted to a nicety.
C. R. BONNE & Co.,
41, Eastcheap, E.C., Agents to the Applicant.
COMPLETE SPECIFICATION.
Improved Apparatus for Cutting Grooves and Channels in Wood.
I, EWALD MÜLLER, of the City of Soran, Germany, Gentleman, 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:—
My invention relates to an apparatus for cutting grooves in wood, for instance
such a groove as is made in a door for putting in the lock and the apparatus
according to my invention is illustrated in the accompanying drawings in
which
Fig. 1 is a half plan and half end view,
Figs. 2 and 4 half plan and half side views, and
Fig. 3 is a ground plan.
screw i
The apparatus consists of a chisel h, fixed in a rack e by means of a thumb
A crank g and a tooth wheel f' move the rack e with chisel / attached
thereto, up or down. The said tooth wheel is placed on a shaft, carried in
uprights d, the arms of which rest upon and grasp two horizontal rods b and c,
one of which is provided with screw threads while the corresponding part of d
is the nut for same. This screw threaded rod is provided with a crank or
wheel and the whole fixed in such a manner that when the wheel m is turned,
the rod upon which the same is fixed is likewise turned, causing the upright d
SDC

page_text: o move forwards or backwards. The rods b and c are fixed in frame a,
between which the piece of wood o to be grooved, is spanned by means of
thumb screws n, or rather the frame, and with that the entire apparatus, is
attached to the wood in this manner.
When now the apparatus is required for use then a hole to commence with, is
bored or otherwise made in the wood, the upright d is moved, in the manner
described to such a position that the chisel point when forced downwards, by
turning crank g, will shave the side of the hole thus elongating it. The
chisel is now again withdrawn, the wheel m turned, thereby shifting the position
of the chisel so that when forced down again it further enlarges the hole and thus
onward until a groove of the desired length has been made.
For the purpose of adjusting the depth to which the chisel shall penetrate into the
wood for every stroke an adjustable ring is placed on rack e and provided with a
set screw so that it can be fixed anywhere. When this ring strikes against
upright d the chisel cannot of course be forced further downwards and in this
manner uniform depth of the groove is assured.
It is obvious that the groove will be parallel relatively to the wood, provided that
the frame a is parallel relatively to the wood; which again may be regulated by
means of screws n.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner it is to be performed, I declare that what I claim is:
The improved apparatus for cutting grooves in wood substantially as described
and as shewn in the drawings.
C. R. BONNE & Co.,
41, Eastcheap, London, E.C., Authorised Patent Agents.