Improvements in Reciprocating and Band Saws.
Year: 1890

page_text: Date of Application, 11th Oct., 1890
Complete Specification Left, 10th Aug., 1891-Accepted, 12th Sept., 1891.
PROVISIONAL SPECIFICATION.
Improvements in Reciprocating and Band Saws.
I, JOSEPH ELTON BOTT of Eyam in the County of Derby, Metallurgist, do
hereby declare the nature of this invention, to be as follows:-
The invention has for its object improvements in reciprocating and, band saws,
whereby they are enabled simultaneously to cut up material and to plane the
divided surfaces thereof.
For this purpose I form the saw with ordinary saw teeth and with planing.
teeth, a number of saw teeth (preferably from three to six) alternating with a single
planing tooth or cutter.
The saw teeth are formed with the usual cutting edges at their points but the
દ set" usually given to such teeth alternately on each side of the saw is dispensed
with. The planing teeth or cutters are relatively of considerable length and are
slightly "set" alternately to one and to the other side of the saw and they have
their cutting, edges formed alternately along one or other side thereof.
A deep space or gullet is formed between each set of saw teeth and the front or.
point of each adjacent planing tooth or cutter and a space or gullet, more or less
deep according to the character of the saw, is made between the rear of each planing
tooth or cutter and, the first of the set of saw teeth to the rear thereof whilst the.
cutting edge is, at such an angle or curve with the line of the teeth, or cutters
generally as to produce a draw cut. The set given to the planing teeth is such
that the cutting edge thereof is in a plane parallel with the plane of the saw teeth,
or nearly so.
In a ripping saw, the saw teeth are, as is usual in ordinary ripping saws,
sharpened nearly square across their points or front edges, whilst the saw teeth of
a cross cut saw, are as is usual with other cross cut saws, sharpened at a more
acute angle.
The planing teeth of a ripping saw are sharpened at a comparatively slight angle.
across their peripheries, outer edges or backs, whilst those of a cross cut saw are
sharpened at a much more acute angle.
The saw may also, be, formed with curved or straight ribs across the blade and
alternately on each side thereof, the general line of such ribs being preferably at a
considerable angle with the length of the saw.
My present invention is more particularly applicable to machine saws.
Dal 111 1
1... 100
COMPLETE SPECIFICATION.
Improvements in Reciprocating and Band Saws.
I JOSEPH ELTON BOTT of Eyam in the County of Derby, Metallurgist 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, reference being had to, the accompanying drawings and to the figures
and letters marked thereon:-
The invention has for its object improvements in reciprocating and band saws
whereby they are enabled simultaneously to cut up material and to plane the divided
surfaces thereaf

page_text: Figures 1 and 2 represent side and edge views of a saw constructed according to
my invention and
Figure 3 represents a side view showing a slight modification.
For this purpose I form the saw with ordinary saw teeth and with planing teeth,
a number of saw teeth alternating with a single planing tooth or cutter.
a. a are the saw teeth which are formed with the usual cutting edges at their
points but the "set" usually given to such teeth alternately on each side of the saw
is dispensed with. b. b. are the planing teeth or cutters which are relatively of
considerable length and are slightly "set" alternately to one and to the other
side of the saw and they have their cutting edges formed alternately along one or
other side thereof.
A deep space or gullet c is formed between each set of saw teeth a and the front
or point of each adjacent planing tooth or cutter band a space or gullet more or
less deep according to the character of the saw is made between the rear of cach
planing tooth or cutter and the first of the set of saw teeth to the rear thereof,
whilst in the saw represented at Figures 1 and 2 the cutting edge is at such an
angle or curve with the line of the teeth or cutters generally as to produce a
draw cut.
The set given to the planing teeth is such that the cutting edge thereof
is in a plane parallel with the plane of the saw teeth a or nearly so.
In the saw represented at Figure 3 the planing teeth are formed with their
fronts square or nearly so with their backs and both of such edges are similarly
sharpened to the one or the other side thereof according to the set of the tooth..
The saw may also be formed as represented by the dotted lines d in Figure 1.
with curved or straight ribs across the blade and alternately slightly projecting on
each side thereof, the general line of such ribs being preferably at a considerable
angle with the length of the saw.
In a ripping saw the saw teeth a are as is usual in ordinary ripping saws,
sharpened nearly square across their points or front edges, whilst the saw teeth
of a cross cut saw are as is usual with other cross cut saws sharpened at a more
acute angle.
The planing teeth of a ripping saw are sharpened at a comparatively slight angle
across their peripheries, outer edges or backs whilst those of a cross cut saw are
sharpened at a much more acute angle.
As shown in the drawings the planing teeth stand a little to the rear of the line
of the saw teeth whereby the planing teeth are not subject to the shocks given to
the saw teeth by the act of sawing but simply act to plane the material at each side
of the saw cut.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed declare that what I
claim is :-
Gi
The construction of reciprocating and band saws with sets of saw teeth having
no set" and with intermediate planing teeth or cutters "set" alternately to each
side of the saw and sharpened on the one or the other side substantially as herein
shown and described.
تبصر
1001
Dated August 10th
100
J. E. BOTT.
By Harris & Mills,
23, Southampton Buildings, London, W.C.