An Improved Fret and Drilling Machine.
Year: 1899

page_text: Date of Application, 12th Dec., 1899
Complete Specification Left, 10th Sept., 1900-Accepted, 8th Dec., 1900
PROVISIONAL SPECIFICATION.
An Improved Fret and Drilling Machine.
I, JAMES CARRUTHERS, Whistle Lodge, Harburn, by West Calder, Joiner, do
hereby declare the nature of this invention to be as follows:-
That whereas in ordinary fret & drilling machines the work requires to be
turned round to suit the saw in my improved machine this is avoided & the saw
is made to adapt itself to the work thus effecting a great economy in time & enabl-
ing the operator to produce larger & more efficient work.
The improvement as regards the saw is effected thus.
The saw clamps work on swivels at top & bottom. The top clamp from the
swivel passes down through a grooved pulley & the bottom one passes up through
another. These two pulleys have slotted centres to fit the clamps which are of
a flat shape allowing the clamps to move freely up & down, but when either of
The pulleys
the pulleys is turned round it turns the clamp along with the saw.
are connected by an endless cord or belt by which the motion is transmitted.
This cord being guided round on small pulleys fixed in the arm of the machine the
operator is enabled while cutting to turn the clamps with saw attached in any
direction.
The drilling attachment is effected thus.
The saw being removed out of the clamps the drill is inserted in its place in
the top clamp. The cord is removed off the top pulley through which the clamp
with drill passes & it is replaced by another endless cord. This cord is driven
from the driving spindle of the machine & is guided up round to the top pulley
by small pulleys fixed on the arm of the machine & thus the pulley with clamp &
drill are made to revolve for the purpose of drilling.
A lever handle attached immediately above the top saw clamp causes the clamp
& drill to descend the tension-spring of saw clamp taking it up again. The saw
clamps are provided with a small hole drilled near the thumb screw which ensures
the saw being always in the centre when turning & the drill when drilling as they
are centred through it before being fixed or clamped by the thumb screw.
Dated this 9th day of December 1899.

page_text: be performed, to be particularly described and ascertained in and by the following
statement:-
-
That whereas in ordinary fret & drilling machines the work requires to be turned
round to suit the saw, in my improved machine this is avoided and the saw is
made to adapt itself to the work thus effecting a great economy in time and
enabling the operator to produce larger and more effecient work. The saw is made
to adapt itself thus. The saw clamps A A work on swivels BB at top & bottom,
the swivels which are fixed on the ends of the saw arms C C consist of a metal
plate with a circular hole in which rests a half ball washer.
The clamps A A which have a long screw for adjusting pass through the plates
& washers and are held in place by small jam nuts, thus forming a swivel BB
which allow the clamps A A to revolve. The clamps A A are made to revolve
by means of two grooved pulleys D D these pulleys DD are fixed on the frame E
of machine between the saw arms CC and in a line with the top and bottom
swivels B B. These pulleys D D have a slot running through the centre of the
boss which fits the clamps A. A. The clamps A A are passed through the slot
of each pulley before being attached by the swivel B to the saw arms CC. The
clamps move freely up & down in the slot of each pulley but when the pulleys D D
are turned they also turn the clamps AA with saw F attached. The grooved
pulleys D D through which the clamps A work are made to revolve, both turn-
ing together by means of a cord or belt G by which the motion is transmitted the
said cord or belt G being guided round on small pulleys HH fixed on the frame E
of machines. By means of a disc or hand wheel I which is fixed on the lower
end of the boss of the bottom pulley, D, the operator can turn the pulleys DD
which cause the clamps A A to revolve with saw F attached in any direction while
cutting.
To assist the operator while cutting, and enable him to follow the saw F when
turning it. A presser foot J is fixed to the lower end of the boss of the top
grooved pulley D by which it is made to revolve, and being placed behind and
in a line with the saw F so that it indicates the position or direction in which the
saw is cutting.
In cutting inlaid work and to retain the advantage of the revolving saw, the
table when once adjusted to the angle required, made to adapt itself to the saw,
thereby maintaining the required angle being made to revolve along with the
saw, by the following means. The tilting table K is composed of three parts the
bottom part consists of a flat ring L Fig. 2 resting on two supports M M on which
it can be raised or lowered, and is fixed by the supports to the frame E of machine
above the bottom pulleys D through which the bottom clamp A works.
On the top of this flat ring L rests the middle part N, which carries the table K,
the middle part N Fig. 2 which is a flat square piece having the centre recessed
on the under side to fit the bottom ring L so that while resting on the ring L
it can revolve, near the centre of the middle part N are two holes, OO Fig. 2
the use of which is hereafter explained.
The top part which is really the table K is fixed by two clamps P P to the
middle part N so that it can be adjusted to the angle required.
The angle being adjusted the whole three parts are lowered untill the middle
part N comes in contact with two upright pins Q Q which cause the middle part N
and table K to revolve.
The points of these two pins Q Q just entering into the two holes 0 0 provided
in the middle part N to receive them.
These two pins QQ are fixed on the upper end of the boss of the bottom grooved
pulley D by means of a collar R.
Thus the middle part N & table K are made to revolve along with the saw F,
while the bottom ring L on which they rest remains stationary.
When cutting ordinary work the whole three parts are raised up, allowing the
pins QQ to revolve freely under them.

page_text: The saw clamps A A Figs. 3, 4, 5, are self centring being provided with a
small hole S in the centre of the end, the saw F entering through it into a square
eye T Fig. 5 formed on the ends of the clamps.
This eye T contains two moveable jaws Fig. 5 which grip the saw between them
by means of a thumb screw Fig. 5 on the side of the eye. The jaw next the
thumb screw is adjusted by it, while the other jaw, is made to move endways
Fig. 3 4 through the eye T. On the face or side of this jaw which grips the saw,
is a small vertical slot U Fig. 34 so that when the jaw is pushed home through
the eye T, Fig. 4 this small slot U comes in a line with the small hole S in the
end of the clamp A. This small slot U is for the purpose of allowing small drills
being gripped in the clamp A. The drill being thicker than the saw the slot U
allows it being gripped in the centre of the jaws, the drill being entered through
the small hole S in the end of clamp A slides up the vertical slot U in the face of
the jaw, and is held by the other jaw being brought against it by the thumb screw
on the side of clamp. Thus the clamps which hold the saw when sawing are
adapted to hold drills for the purpose of drilling.
The top clamp A is converted into a drilling spindle at will and is effected thus.
When the drill is gripped in the top clamp as explained.
The belt G by which the grooved pulleys D D were made to turn, is removed
from the bottom one being allowed to remain on the top one, so that the top
pulley D with clamp A and drill are made to revolve by means of the belt G which
is lead from the top pulley D down to the driving spindle of machine, on small
pulleys V H fixed on the frame E of machine. When drilling the clamp A with
drill are made to descend by simply pressing down the top saw arm C to which
they are fixed, and are raised by a small spring W fixed between the arm C and
frame E of machine. The tension of the stretcher rod X is relaxed to give the
top arm C freedom when drilling. Thus the usual vertical drilling attachment is
dispensed with.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:―
1. Improved revolving saw clamps for cutting and drilling all as substantially
described.
2. Revolving presser foot which is used as an indicator all as substantially
described.
3. Revolving tilting table all as substantially described.
Dated thin 9th dr. of th
1000