IMPROVEMENTS IN OR ADDITIONS TO SAWS
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by John Henry Johnson at the Office
of the Commissioners of Patents on the 30th October 1883. Communicated to
him from Félix Alphonse Troemé-Becker, a person 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 Træmé-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 bo formed either on a portion of the saw blade itself or
on removeable blades slipped into openings in the Saw blade and retained in
position by V shaped edges extending round a part of the sides of the openings
Counter-
fitting into corre-ponding grooves in the sides of the plane or vice versa.
sunk 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 blades from slipping out
accidentally. The removable blades are slightly tapered so as to be firmly held in
the opening 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 the nature of the
wood the edges being preferably curved so as not to act along their entire length

page_text: und 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 blade 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.