An Improvement in Spring Fret Saw Machines.
Year: 1895

page_text: Date of Application, 3rd Oct., 1895
Complete Specification Left, 21st Mar., 1896-Accepted, 25th Apr., 1896
PROVISIONAL SPECIFICATION.
An Improvement in Spring Fret Saw Machines.
HENRY MATTHEW COLES 299 Brick Lane, London N.E. Fret Cutter, do-
hereby declare the nature of this invention to be as follows:-
The introduction of a spring or springs attached to lower sliding bar of machine,.
in such a manner as to compensate for and counter-balance the upward strain of
top spring or springs when saw is strained. Thereby equalising the strain of
tension on up and down stroke of machine.
Dated this Third day of October 1895.
An Improvement in Spring Fret Saw Machines.
I, HENRY MATTHEW COLES 299 Brick Lane, London 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 :-
This invention relates to an improvement in spring fret saw machines and
consists in the use of one or more springs which operate the lower and upper
sliding rods or bars, to each of which one end of the saw is secured.
The plate carrying the upper sliding rod and springs is adjustably attached to
the frame of the machine or a support by means of bolts passing through slots in
same.
In order that my invention may be fully understood I now refer to the annexedi
drawings in which:
Figure 1 is a front elevation of a fret saw machine showing my invention.
a is the saw blade which is secured at its ends to the sliding rods b & c
respectively, 6 being the upper sliding rod and c the lower.
C
The upper sliding rod is carried by the plated having slots e said plate being
secured to the support by means of bolts g. h, h, are the upper springs connected
at one end by the hooks i to the plate d and at the other to the upper sliding rod b.
at
The lower springs j,j are connected at the ends to the hooks k, k, secured to the
frame and at m to the lower sliding rod c. This lower sliding rod c is pivotally
attached to the lever or bar n at o which is in turn connected with the crank pin p
upon the disc or wheel q which is carried upon the spindler which rotates in the
bearings s. t and u are the ordinary fast and loose pulleys upon the spindle r.
Any convenient power may be employed to cause the disc or wheel 9 to rotate so
as to give an up and down motion to the saw blade a.
It will be seen that by the use of the upper springs h, h, and lower springs j,j,
the strain upon the saw blade a is of a more equal or constant force.
The plate d may be raised or lowered by means of the slots e in same and bolts
so as to regulate the tension of the springs.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I, declare that what I
claim is :-
In fret saw machines, in combination two or more springs attached to the sliding
rods, said sliding rods carrying the saw blade between the ends of same, a slotted
plate secured to the frame of the machine by screws passing through said slots so
that the tension of the springs may be varied or adjusted substantially as described
and illustrated.
Dand this 10th day of March 1906
E. EATON,
Agent for Applicant.