An Improved Planing Tool or Spokeshave.
Year: 1889

page_text: COMPLETE SPECIFICATION.
An Improved Planing Tool or Spokeshave.
We RUDOLF VON SCHMITZ, Civil Engineer, and GUSTAV HEYMEIER, Sculptor, both
of Bremen in the Empire of Germany 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:—
The invention hereinafter described relates to a plane or tool for planing or making
even the bottom of ornamental recesses in wood work.
And in order that this invention may be fully understood and readily carried into
practice we will proceed to describe the same with reference to the accompanying
drawings.
Figure 1 is a front view and Figure 2 an underside view thereof.
Figure 3 is a central cross section of the plane on line A B of Figure 1. Figure 4
is a view of the blade with the protecting plate. Figure 5 is a cross section through
the tool on line CD of Figures 1 and 2.
The plane is arranged in the following manner. The blade chaving a straight or
curved edge is fixed in the metal frame a against a plate by means of a screw gas
shown and is arranged to move to and fro in a slot in the plate. In front of the
blade c is arranged the piece e having the form of a tooth made of bone or other similar
suitable material capable of being adjusted as to its length and fixed by means of the
screw d. This tooth shaped piece e prevents the blade from cutting too deeply into
the wood. The depth of the cavity to be planed is determined by the portion of the
blade e projecting beyond the plate b. This plate is screwed at the lower part of the
frame or shell and hence can be replaced by a plate of different curvature. When a
groove has to be planed the plate f formed with a curved edge is sunk down to the
cutting edge of the blade and thus the blade is guided in the curved groove which is
allowed to retain its shape-except in those parts where the blade acts.
The tool represented by in the drawing works like an ordinary plane and is
designed to cut a furrow out of small wooden pillars such as are used as legs or supports
for furniture and for similar objects. The form of the knife and its point differ
according to the grooves to be formed-also the shape of the piece e is regulated by
them that is to say is formed according to and so as to correspond with them. When
chamfers (furrows) are to be made the plate or flap fis sunk so far that it does not
stand in front of the knife. By this means the sides of the groove remain untouched
when the tool is used while the knife planes simply at the bottom of the groove in that
part which lies between the two sides.
The plate in the under plate of the plane and serves to furnish a guiding plane on
the tool when using the plane.
The plate is either straight or slightly arched. It can be screwed off and changed
by means of screws.
The shape of the grooves which are formed by the plane is quite a distinct one
and adapts itself essentially to the shape of the tool c.. If this be even on its lower
working level so straight uniform cavities are cut in the wooden object if however it
be of a curved form a groove is produced of a corresponding curved form.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. A plane or tool having a blade c movable in a shield plate
a tooth shaped guiding piece e for the purpose of planing
bottom of ornamental recesses in wood work substantially as
set forth.
from which projects
or rendering even the
and for the purposes

page_text: 2. In the plane for planing the bottom of a groove or channel the use of a shield
plate or flap provided with a curve substantially as and for the purposes set forth.
Dated this 15th day of March 1889.
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicants.