IMPROVEMENTS IN FRAME SAWS
Year: 1875

page_text: PROVISIONAL SPECIFICATION left by Edward Newton at the Office
of the Commissioners of Patents, with his Petition, on the 20th
February 1875.
I, EDWARD NEWTON, of 12, Warwick Place, West Drayton, in the
County of Middlesex, Gentleman, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN FRAME SAWS," to be as follows:—
This Invention relates to improvements in frame saws.
According to my Invention I use a rigid frame either rectangular or
curved, and strain or tighten up the saw by a direct screw action as herein.
after explained, applied in the direct line of the length of the saw blade.
The ends of the frame between which the saw blade is stretched have
drilled through each of them a circular hole in the direction of the saw
blade when in use, through each of which holes the end of a handle is
passed, a shoulder on the handle butting against the outer side of the
frame, and preventing the handles passing through further than required.
to and between the inner ends of these handles the saw blade is fixed;
these inner ends have each a saw cut formed in them in the direction of
their length, and a pin fixed through transversely, a small notch being
made in each end of the saw blade to take on to these pins. The notch

page_text: in one end of the saw blade is made of an angular or other form, so that
when the saw blade is stretched it cannot be forced off the pin whilst
the notch at the other end is made simply to drop on to the pin in the
handle, the saw being fixed in position by the action of tightening up
the same. This is effected as follows:-The projecting part of the
handle in which the end of the saw blade is held by the pin is formed of
a square spindle passing through a like shaped aperture in the outer
part of the handle. The outer end of this spindle is furnished with a
screw thread, upon which is worked a nut butting against the outer part
of the handle, so that by turning the nut in the direction to screw it on
to the spindle the spindle will be drawn into the handle, tightening up
the saw blade, and at the same time locking it in the notch of the
handle. Or instead of fixing the saw as described the end may be
notched and inserted into a groove formed in the handle, which handle
is provided with a spring to take into the said notch, and thus hold the
saw.
In order to hold the handles firm in the frame, and at the same time
allow them to be turned round when required, a saw cut is passed
through the ends of the frame so as to cause them to bite on the handles
with a spring action. Or the holes in the extremities of the frame may
be lined with india-rubber tube, or other spring action may be used to
tighten the hold on the handles.
In order to have the frames as light as possible, I prefer to make them
up to using solid material. This may be done in various ways. One
method is to have the two sides joined by two stretchers at the ends
opposite to the saw blade, the inner one to take the strain of tightening
up the saw, and the outer or upper to tie together the ends of the two
sides. If one piece of bent wood is used I prefer to let in at the top a
thin plate of steel or other material, thus greatly strengthening the
frame with but a small addition of weight; I find in practice a tubular
metal frame both light and strong. This I form by stamping out the
two halves of the tube longitudinally with a flange on one or both sides,
and fastening them together by riveting or soldering, or by other suitable
means.
.
The handles I form very simply as follows:- -I bore a hole lengthwise
1
11

page_text: prevent it going further through than required. The projecting portion
of the tube is inserted in the ends of the frame as described.
I provide for the flexibility of the saw blade by placing an india-
rubber washer, spiral or other spring between the extremities of the
frame, and the shoulders on the handles saw.