Improvements in Curvilinear Planing Machines.
Year: 1887

page_text: Date of Application, 25th Feb., 1887
Complete Left, 22nd Nov., 1887
Complete Accepted, 23rd Dec., 1887
TRUVIDIONAL DIECIFICATION.
Improvements in Curvilinear Planing Machines.
We, BENJAMIN CHEW TILGHMAN, Engineer, and GEORGE RICHARDS, Engineer, both.
of Altrincham, in the County of Chester, do hereby declare the nature of our invention
for IMPROVEMENTS IN CURVILINEAR PLANING MACHINES, to be as follows:-
Our invention relates to machines for planing metals in curved lines and consists in a
combination of a side planing machine of the kind described in the Specification of the
Patent granted to George Richards, 13th May, 1882, No. 2260, or its equivalent, with
a radius bar, in such a manner that the tool which is fastened to the end of the radius
bar, receives its longitudinal motion and cutting force from the overhanging arm, and
at the same time is free to slide crossways in said arm, so that the tool moves in a
curved line over the work, which is held stationary.
The tool post is fastened to the radius bar in such a manner that the tool will retain
the proper angle of clearance with the work during the whole stroke.
Different degrees of curvature are obtained by varying the distance of the pivot of
the radius bar from the tool, and by sliding the radius bar on the pivot box.
By giving to the radius bar two pivots, which move in slots placed at an angle with
each other, the tool can be made to describe eliptic or other curves.
Vertical and horizontal feeds, either automatic or by hand, are given to the tool.
Dated this Twenty fourth day of February 1887
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page_text: DENJAMIN CHEW LILGHMAN, and GEORGE RICHARDS, both of Altrincham,
Cheshire Engineers, 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 :—
Our invention relates to machines for planing metals in curved lines and consists in
a combination of a side planing machine of the kind described in the Specification of
the Patent granted to George Richards dated 13th May 1882, No. 2260, or its
equivalent with a radius bar, in such a manner that the tool which is fastened to the
end of the radius bar, receives its longitudinal motion and cutting force from the over-
hanging arm of the side planing machine, and at the same time is free to slide
crossways in said arm, so that the tool moves in a curved line over the work which is
held stationary. The tool post is fastened to the radius bar, and is free to turn in the
slide of the overhanging arm, in such a manner that the tool will retain the proper
angle of clearance to the work during the whole stroke. Different degrees of curvature
are obtained by varying the distance of the pivot of the radius bar from the tool, and
by sliding the radius bar on the pivot block. By giving to the radius bar two pivots
which move in slots placed at an angle to each other the tool can be made to describe
eliptic or other curves. Vertical and horizontal feed motions, either automatic or by
hand are given to the radius bar and the tool.
The following is a description of the machine, referring to the drawings, Fig. 1.
being a plan, and Fig. 2. an elevation.
A is the cutting tool fastened in a tool post or sleeve B, which is capable of being
rotated and fastened to the radius bar C at any angle so as to give the tool the proper
angle of clearance to the work.
°
The sleeve B is attached to and capable of rotating in the slide D, which is free to
move backward and forward on the arm E, while the arm moves backward and forward.
on the bed F of the machine.
The motion of the arm E is usually given by a screw turned by reversing pulleys
GG G, as is well understood.
The radius bar C, has a long slot at one end, and can be made to slide on the pivot
block H, by means of the screw S so as to change the effective length of the radius bar
between the pivot and the tool A.
This causes a feed of the tool across the work so as to describe an arc of a larger or
smaller circle.
The feed motion can be given by hand or automatically from the reciprocating
motion of the arm E, as is well understood. The screw K causes the pivot block H to
slide in a slot in the bracket I, which is at-right angles to the bed F, and the block
can be fastened at any point of the bracket so as to form the centre of the arc described
by the tool.

page_text: The slot in the radius bar C is made long enough to allow the pivot block H to be
placed at any point in the bracket I.
The tool A is arranged to feed downward to the work by ordinary methods. The
tables TTT support and hold the pieces operated on, by ordinary methods. The
length of stroke or traverse of the arm E on the bed F is regulated by adjusted stops
as is well understood.
The operation of the machine is as follows. The work is fastened to the tables TT,
and the stroke of the arm E is regulated to the length of the cut. The pivot block H
is adjusted in the bracket I, and in the slot of the radius bar C, so that the tool moves
in the required arc, and is then clamped fast in the bracket I. The rotary sleeve B is
then adjusted so that the cutting edge of the tool has the proper angle of clearance to
the work and is then clamped fast to the radius bar C, but is capable of turning in the
slide D. After each stroke of the arm E the tool is fed across the work by the screw S
which lengthens or shortens the radius of the arc described.
Having now particularly described and ascertained the nature of our said Invention
and in what manner the same is to be performed, we declare that what we claim is
A machine for planing metals in curved lines consisting of a combination of a side
planing machine such as is described in the Patent granted to George Richards dated
13th May 1882, No. 2260, or its equivalent, with a radius bar having at one end an
adjustable pivot or pivots, and at the other end a tool having the angle of clearance of
its cutting edge kept in a fixed relation to the radius bar, and capable of sliding in the
overhanging arm of the planing machine and receiving motion therefrom, substantially
as described.