Improvements in "Fret" or other Sawing Machines and Drill Appliances connected therewith.
Year: 1892

page_text: Date of Application, 8th Mar., 1892
Complete Specification Left, 6th Oct., 1892-Accepted, 26th Nov., 1892
PROVISIONAL SPECIFICATION.
Improvements in "Fret" or other Sawing Machines and Drill
Appliances connected therewith.
We, ABRAHAM JONES, of 69 Grattan Street, Burley Road, Leeds, in the County
of York, Joiner, and ELIZA SHEPHERD, of 349 Lower Broughton Road, Broughton,
Manchester, in the County of Lancashire, do hereby declare the nature of this
invention to be as follows:-
Our invention relates to that type of sawing machines in which the saw is kept
in tension between the ends of two rocking beams, whilst the opposite ends of the
rocking beams are connected together by a rod or other connection.
In machines of this description hitherto constructed, the rocking beams are
actuated by a crank situated on a shaft, which crank moves the rocking beams up
and down, and in the case of the saw breaking the rocking beams are thrown up
and down in a manner both dangerous to the operator and injurious to the machine.
According to our invention, we provide a shaft carrying a cam or eccentric
which bears against the lower rocking beam, and is for the purpose of imparting
the downward movement to the saw, the return or upward movement being
obtained by means of a spring situated above the saw.
The rear ends of the rocking beam are connected together by a rod having a
slotted end to same, which rod tends to keep the beams together, but not to hold
them apart.
Should the saw break whilst the machine is working, the lower rocking beam
falls away from the cam, and the upper beam is lifted by the spring, thus throwing
the apparatus out of action at once and preventing the beams being rocked
violently up and down to the danger of the attendant and damage of the machine.
The fulcrum of the lower rocking beam is preferably fixed, and the upper rocking
beam is fulcrumed to an adjustable support on the extremity of a lever carried on
the framework. The adjustment of the fulcrum of the rocking beam may be
effected at either extremity of the lever, or at both extremities, the free end of the
lever engaging with a rack situated on the framework, and the fulcrum of the
rocking beam may be adjusted by screws or other means on the opposite end of
the lever. This arrangement of fulcrum of the rocking beam is for altering the
tension of the saw.
The fret saw is clamped between two faces and passes through a hole in the
clamping screw, which makes a much firmer holder for the saw and allows of the
employment of a fly nut, instead of a nut requiring a spanner to operate same.
The table may be adjustable for the performance of inlaid work, and a slot may
be provided in the table for receiving a circular saw, mounted on adjustable screws
beneath the table, which saw may be removed at pleasure.
For the purpose of making holes in the wood to be worked, we employ a drill
mounted on the end of an arm, and driven by a band or cord from a pulley situated
on the framework, such arm being supported at the end carrying the drill by a
hook, which is attached to the upper clamp employed with the fret saw, and thus
the arm carrying the drill is held up by the spring and can be brought down onto
the work by the hand when desired.
A lever, cam, or other appliance may be employed to hold the beams in the
down position, and so throw the apparatus out of action without stopping the
driving shaft.
D
كيم
1

page_text: ATION
Improvements in "Fret" or other Sawing Machines and Drill
Appliances connected therewith.
We,
ABRAHAM JONES, of 69 Grattan Street, Burley Road, Leeds, in the County
of York, Joiner, and ELIZA SHEPHERD, of 349 Lower Broughton Road, Broughton,
Manchester, in the County of Lancashire, 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 :-
Our invention refers to fret or other reciprocating sawing machines, and
particularly to that type in which the saw is kept in tension between the ends of
two rocking beams, whilst the opposite ends of the rocking beams are connected
together by a rod or other connection.
In machines of this description hitherto constructed, the rocking beams are
actuated by a crank situated on a shaft, which crank moves the rocking beams up
and down, and in the case of the saw breaking, the rocking beams are thrown up
and down in a manner both dangerous to the operator, and injurious to the
machine.
In order that our invention may be clearly understood and readily carried into
effect, we will proceed to describe same with reference to the accompanying
drawings in which similar letters refer to like parts in all the figures.
Fig. 1 is a side elevation, partly in section, of a machine constructed according
to our invention.
Fig. 2 is a plan of same.
Fig. 3 is a part end elevation.
Fig. 4 is a part plan, shewing drill appliance fitted to the machine, and
Fig. 5 is an elevation of the parts shewn in Fig. 4.
According to our invention we provide a shaft A carrying a cam or eccentric B,
which bears against a bearing C situated on the lower rocking beam E, and is for
the purpose of imparting the downward movement to the saw G; the return or
upward movement being obtained by means of a spring H situated above the saw.
The rear ends of the rocking beams E and F are connected together by a rod J
having a slotted end J' to same, which rod tends to keep the beams E and F
together, but not to hold them apart.
Should the saw G break whilst the machine is working, the lower rocking
beam E falls away from the cam B, and the upper beam F is lifted by the spring H,
thus throwing the apparatus out of action at once, and preventing the beams
being rocked violently up and down to the danger of the attendant and damage of
the machine. Any sort of spring may be employed for raising the upper beam F,
such for instance as a V spring, but the spring H shewn in the drawing is simple
and has been found to answer the purpose well.
The fulcrum E of the lower rocking beam is preferably fixed, and the upper
rocking beam F is fulcrumed at F' to an adjustable support K on the extremity
of a lever L carried on the framework. The adjustment of the fulcrum F¹ of the
rocking beam F may be effected at either extremity of the lever L. The free end
of such lever L engages with a rack M situated on the framework, whereby said
lever can thus be adjusted up or down to suit the required tension of the saw.
For altering the tension of the saw the fulcrum of the rocking beam F can also be
adjusted by the fly-nut K¹ working on the adjustable support K on the opposite

page_text: end of the lever L. This arrangement of fulcrum of the rocking beam is for suiting
the machine for different lengths of saws.
The fret saw G is clamped in clamps N and O, each having two faces N', N2,
Fig. 3, and O, O2, and such saw G passes through a hole in the clamping screw,
which makes a much firmer holder for the saw G, and allows of the employment
of fly-nuts N and O³, instead of nuts requiring a spanner to operate same.
The table P may be adjustable for the performance of inlaid work, such adjust-
ment being obtained by unscrewing the fly-nut Q, and allowing the table P
to turn on its centre, coming down on one side upon the angular frame P1, when
the fly-nut Q can again be tightened and the table held in its inclined position.
A slot R may be provided in the table P for receiving a circular saw S mounted
on adjustable screws T T beneath the table, which saw S is driven by a band or
cord being passed round the pulley U on the driving shaft A and onto the small
pulley S on the said spindle. This circular saw S may be thrown out of gear and
removed at pleasure.
For the purpose of making holes in the wood to be worked, we employ drill V
mounted on the end of an arm W, such drill V being driven by a band or cord X
from pulley X on the driving shaft A, such cord being passed round the pulleys X'
and the pulley X³ situated on the framework of the drill. The arm W is supported
at its end carrying the drill V by a hook Y, which is attached to the upper
clamp N employed with the fret saw, and thus the arm carrying the drill V is held
up by the spring H, and can be brought down onto the work by the hand of the
operator when desired.
During the drilling operation a lever, cam, or other appliance may be employed
to hold the beams E and F in the down position, and so throw the sawing apparatus
out of action without stopping the driving shaft A. A suitable catch lever
appliance, best seen Fig. 3, has been shewn in the drawings, in which a is the catch
lever fulcrumed at and held in position by the arm c. In order to throw the
sawing apparatus out of gear the arm c is moved inwardly, thus bringing the
shoulder a of the lever a over the lower rocking beam E and holding same down
out of action.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:
1. In fret or other reciprocating sawing machines, the employment of a shaft
carrying a cam or eccentric, which latter brings the saw down on the cutting
stroke, but which is free to rotate without communicating motion to the machine
should the saw break, substantially as set forth.
2. In fret or other reciprocating sawing machines, the employment of an adjust-
able support for the fulcrum of the upper rocking beam, for the purpose of
controlling the tension of the saw, substantially as described and shewu in the
accompanying drawings.
3. In reciprocating sawing machines, the employment of an arm carrying a drill
at its outer end, which drill is geared to the main shaft and supported by means of
a hook attached to the spring head of the upper arm, substantially as described and
sbewn in the accompanying drawings.
4. In fret or other reciprocating sawing machines, the employment of connecting
rod J having slot J1, the said connecting rod J being for the purpose of holding
the ends of the rocking beams together but not to keep them apart, substantially
as described and shewn in the accompanying drawings.
5. In reciprocating sawing machines, the employment of clamps N and O
substantially as and for the purposes set forth.
6. In reciprocating sawing machines, the employment of a lever a for throwing
the apparatus out of action, substantially as described and shewn in the accompanying
drawings.
7. The arrangement, construction, and combination of the various parts forming

page_text: the sawing machine and drill appliance connected therewith, substantially as herein
set forth.
1000
CELES CA City
ABRAHAM JONES.
ELIZA SHEPHERD.
Brewer & Son,
33, Chancery Lane, London, and 30, East Parade, Leeds,
Agents for Applicants.