IMPROVEMENTS IN, OR ADDITIONS TO, SAWS
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by John Henry Johnson at the Oflice
of the Commissioners of Patents on the 26th June 1883. Communicated to
him from Félix Alphonse Troemé-Becker, a porson resident at Paris in the
Republic of France.
JOHN HENRY JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex,
Gentleman, "IMPROVEMENTS IN, OR ADDITIONS TO, SAWS:" a communication
to me from Felix Alphonse Troemé-Becker a person resident at Paris in the
Republic of France
This Invention relating to improvements in Saws consists in combining Saws
with means for planing or smoothing the surface of the wood as hereinafter
described.
The work of sawing and planing wood has heretofore been divided into two
distinct and independent operations but according to this Invention these
operations are performed simultaneously thereby effecting a considerable saving of
time materials and tools whilst at the same time the planing is more efficiently
effected than by the planing devices heretofore employed
The saw blade made according to this Invention is of about the usual width
and the teeth are of the ordinary form but at about the middle of the blade there
are formed openings extending diagonally and preferably at different angles
alternately and provided with blades or cutting edges which project slightly from
the surface of the saw on opposite sides of the latter similarly to the cutting
edges of ordinary planes-These edges are preferably inclined at opposite angles
alternately to the line of the teeth and may be formed either on a portion of the
saw blade itself or on removeable blades slipped into openings in the saw blado
and retained in position by V shaped edges extending round a part of the sides of
the openings fitting into corresponding grooves in the sides of the plane or
vice versa.
Countersunk holes are drilled half in the plane and half in the Saw
blade for the reception of pins rivets or screws which prevent the planing bla-les
from slipping out accidentally-The removable blades are slightly tapered so as to
be firmly held in the openings by a wedging action and a recess is provided at
the back of the plane for the introduction of a tool to facilitate its extraction.
The planes are inclined more or less obliquely according to the nature of the

page_text: wood, the edges being preferably curved so as not to act along their entire length
and are so set as to remove an extremely thin shaving just sufficient to clean off
the marks of the saw teeth. The latter require to have scarcely any way or set on
them as the planes follow closely and clear the cut directly behind the teeth.
The planes are so set that the extremities of the edges do not cut and overlap in
order to avoid ridges
The planes projecting from the one side of the saw blade plane the wood on one
side of the saw cut whilst the planes projecting from the opposite side of the blade
plane it on the other side of the said cut.
Similar results may be obtained by employing planing irons or cutters arranged
on a separate blade or a thin rod placed directly behind the saw blade and moving
with the latter-In this case the saw is made narrower than when the fixed or
moveable cutters are directly attached to the saw itself.
A smooth polished surface may be produced by employing a lozenge shaped or
rectangular scraper or polishing-iron-attached-to-the-saw-blado in-a-similar..manner.
to the planing cutters which precede them and interweaving a polishing skin or
leather or glass paper through suitable slits in the saw behind the planes
When applied to circular saws the wood operated upon must not be so thick as
to rise above the radius of the cutters.