An Improved Tool for Setting Saw-teeth.
Year: 1890

page_text: Date of Application, 22nd Sept., 1890
Complete Specification Left, 30th Apr., 1891--Accepted, 30th May, 1891
PROVISIONAL SPECIFICATION.
An Improved Tool for Setting Saw-teeth.
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this invention (a communication_to me
from abroad by William Johnstone, of 217, East 30th Street, in the City County
and State of New York, United States of America, Carpenter) to be as
follows:-
The object of this invention is to provide a practical saw-set whereby two
contiguous teeth may be set at each operation, and to this end the invention
consists principally of two oppositely-acting main frames pivoted to two levers,
one frame carrying two anvils and the other frame one of the punches the other
punch being carried by one of the levers.
The levers are practically L-shaped, the shorter member of the one lever being
formed by a pair of check pieces between and to which the other lever is pivoted
by a pin situated at the angle of the lever whose short arm plays between the
cheek pieces of the first mentioned lever. On the same pin is also pivoted the one
main frame comprising the cheek pieces, inner and outer bridge pieces. The cheek
pieces are slotted to receive the saw to be set and are provided on their inner sides
with ways in which is placed an anvil block carrying an anvil adapted to be
moved in its ways to and from the saw by a set screw which works in the outer
bridge and is swivelled at its inner end to the anvil block. The set-finger or punch
which acts against the said anvil is pivoted to the end of the short arm of the one
lever whilst the opposite set finger or punch (which acts against another anvil
carried by the inner bridge piece before referred to) is mounted on a traversing.
screw or worm and guide rod at the outer end of the other main frame which
frame is pivoted to the angle of the other lever so that when the levers are brought
together, the oppositely directed set-fingers will be caused to approach their anvils.
In this movement said frame is suitably guided, and may be disengaged from its
guides for convenience in adjusting the anvils to suit the size of the teeth to be set,
whilst by turning the traversing screw or worm, the corresponding set-finger may
be laterally adjusted to suit fine or coarse saws. The edges of both anvils are
bevelled at different degrees of slant on different sides to suit different degrees of
set to be put in the saw teeth and the anvils may be turned to bring either bevel
into position for use.
The hand levers are normally held apart by a spring, and, in using the saw
set, the saw is placed in the saw slot and the set fingers adjusted to come in line
with the teeth. The adjustable anvil block is then forced firmly against the saw
blade. The levers are then pressed together which forces the set-fingers in opposite
directions against contiguous teeth and bends them against the bevelled edges of
the anvils so that two teeth are set at each operation. The saw is then released
from between the anvils, the set moved to the next teeth, and the operation repeated.
and so on, until all the teeth are set. When the levers are open they abut against
a stop, making both levers open the same distance.
Dated this 22nd day of September 1890.
A.
MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.

page_text: COMPLETE SPECIFICATION.
An Improved Tool for Setting Saw-teeth.
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark,
of 53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of
Patent Agents, do hereby declare the nature of this invention (a communication
to me from abroad by William Johnstone, of 217, East 30th Street, in the City,
County, and State of New York, United States of America, Carpenter) and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
The object of this invention is to provide a practical saw-set whereby two
contiguous teeth may be set at each operation; and to this end the invention
consists principally of two main frames pivoted to two levers and fastened to
slide together in opposite directions, one frame carrying two anvils and the
other frame one of the punches, the other punch being carried by one of the
levers.
The invention also consists in the construction, arrangement, and combination of
parts, all as hereinafter described and claimed.
Reference is to be had to the accompanying drawings, forming part of this
Specification, in which
Figure 1 is a side elevation, and Figure 2 a plan view, of the new saw-set.
Figure 3 is a sectional elevation, on line a-x, Figure 2.
Figure 4 is a view of the under side of the tool; and
Figure 5 is an end view, shewing the upper frame turned up to vertical position.
Similar letters of reference indicate corresponding parts in all the figures.
A represents a lever formed with two cheek pieces a a, and B represents
another lever formed with the arm & pivoted to and between the cheek pieces a a on
the pin a. On the pin a¹ is also pivoted the main frame C comprising the cheek
pieces e inner bridge piece or sill c¹ outer bridge piece or sill c² and guide c.
The cheek pieces c c are slotted, as shewn at d, to receive the saw to be set. In
front of this slot the said check pieces ce are provided on their inner sides with
the ways d' d' in which is placed the anvil block D provided with the anvil D'
held thereto by the set screw D2 and adapted to be moved to and from the saw on
the ways d d by the large set screw D³ which works in the outer bridge c² and is
swivelled at its inner end to the anvil block, as shewn clearly in Figure 3. The
edges of the anvil D' are bevelled, as shewn at d, at different degrees of slant on
different sides to suit different degrees of set to be put in the saw teeth and by
loosening the set screw D2 the anvil may be turned to bring either bevel into
position for use. E is the set-finger or punch which acts against the anvil D' and
F is the opposite set-finger or punch which acts against the other anvil G, held
on the bridge piece or sill c¹ by the set screw G. The set-finger or punch E is
held by the guide c¹ above referred to, and is reciprocated by the arm 6 of the
lever B to which arm it is pivoted on the pin e which passes through a slot e¹ in
the said arm, as shewn clearly in Figure 3. The set-finger F is held on the
transverse screw or worm H' and rod I at the outer end of the yoke frame H
which yoke frame is pivoted on pins at ff to the cheek pieces a of the lever A
so that when the levers A B are brought together, like the handles of pincers, the
yoke frame will be moved back to cause the set-finger to approach the anvil G.
In this movement said yoke frame is guided by the projections g at the outer ends
of the cheek pieces c and the sliding plate J attached to the outer bridge piece of
the frame H by a set screw J' which passes through a slot j in the said plate, the
side projections j' thereof entering under the said projections g. By loosening the set
screw the plate J may be withdrawn from beneath the lugs or projections g and
the yoke frame H turned up to the position shewn in Figure 5 for convenience in
adjusting the anvils D¹, G. to suit the size of the teeth to be set. By turning the

page_text: screw or worm H₁ the set-finger G may be laterally adjusted to suit fine or coarse:
saws. The anvil G has its edge bevelled, as shewn at g², like the anvil D¹ so that
it is adapted to set the saw more or less by simply loosening the thumb-screw G¹
and turning the anvil, selecting the appropriate bevel for the saw to be acted upon.
The levers A B are normally held apart by the spring M held between them on
the curved rod M' attached to the lever A and passing through a hole in the
lever B.
In use, the saw to be set is placed in the slot d and the set-fingers adjusted to
come in line with the teeth. The screw D³ is then turned to force the anvil
block D firmly against the saw-blade. The levers A B are then closed which
forces the set-fingers against opposite teeth and bends them against the bevelled
edges of the anvils, so that two teeth are set at each operation. The screw D³
is then turned back and the set moved to the next teeth and the operation repeated
and so on until all the teeth are set. The bridge besides holding the set-finger
or punch E in place also acts as a stop for the anvil G to prevent it from turning
or sliding back and the ledge c on the anvil block D prevents the anvil D' from
slipping back or turning around. When the levers A and B are open they rest
against the bridge e making both levers open the same distance. If only the
lever B were to come in contact with the bridge c, the lever A might open too
much, and the lever B not enough, to come in contact with the bridge c, con-
sequently the set-finger or punch E would catch on the teeth of the saw and would
not allow the saw-set to be moved along the saw. A lip c' is formed at the front
of the lever B.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what
I claim is-
1. A saw-set, comprising two main frames pivoted to two levers and operating
in opposite directions in combination with two oppositely arranged anvils and two
punches one punch being carried by the upper frame and the other by one of the
levers, substantially as shewn and described.
2. In a saw-set, a main frame having a bridge piece on which is mounted an anvil
in combination with a sliding anvil block an anvil mounted thereon, a set screw for
moving the anvil block, two opposite set-fingers, and means for reciprocating said
fingers, substantially as described.
3. In a saw-set, the lever A provided with the downwardly-projecting cheek
pieces a and the lever B formed with the upwardly-projecting arm b in combination
with the main frame C pivoted to the said cheek pieces and provided with the
anvils D' and G, the auxiliary frame H pivoted to the lever A, the set-finger E
pivoted to the arm and the set-finger F held in the frame H, substantially as
described.
4. In a saw-set, the lever A formed with the cheek pieces a a and the lever B
formed with the arm b combined with the set-finger E pivoted to the said arm b
and the main and auxiliary frames C and H pivoted to the said cheek pieces, sub-
stantially as described.
5. In a saw-set, the combination of the main frame C slotted at d and having
the bridge piece c' provided with the anvil G the movable anvil block D and the
reversible anvils D and G, substantially as described.
6. In a saw-set, the main frame C formed with the slot d bridge pieces c', c², and
ways din combination with the anvil block D held in the ways d' the anvil G held
on the bridge piece c¹ the anvils D' and G the set-finger E attached to an arm of
the lever B the auxiliary frame H attached to the lever A and the set-finger F
adjustably attached to the auxiliary frame, substantially as described.
7. In a saw-set, the auxiliary frame H provided with the transverse worm H¹
and rod I in combination with the set-finger F, substantially as described.
8. In a saw-set, the auxiliary frame H provided with the transverse worm H¹

page_text: and rod I in combination with the set-finger F the anvil G and the levers connected.
to reciprocate the auxiliary frame, substantially as described.
Dated this 30th day of April 1891.
A.
MELVILLE CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.