Year: 1885

page_text: TTY
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I JOSIAH LAYBOLT of Wakefield, Massachusetts, United States of America,
Mechanic, 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:-
My invention relates to that class of saw-sets or apparatus or devices for setting
saws which are adjustable; and it consists in a novel construction and arrangement
of the parts as hereinafter set forth, by which more desirable and effective devices
of this character are produced than are now in ordinary use.
The nature and operation of the improvement will be readily understood by all
conversant with such matters from the following explanation, reference being had
to the accompanying drawing in which
Figure 1 is a side elevation of my improved saw setting apparatus the bench
supporting the same being represented in vertical cross section.
Figure 2 is a top view or plan of the set proper detached from the bench.
Figure 3 is a side elevation shewing a modification of the set as constructed for
hand use, a portion of the handles being represented as broken away.
Figure 4 is a vertical longitudinal section of the same.
Figure 5 is a top view or plan of the set shewn in Figure 3; and
Figure 6 an end view of the same.
Like letters of reference indicate corresponding parts in the different Figures of
the drawing.
A represents the head of the set, which is hollow, and elongated in the modifi-
cation shewn in Figures 3, 4; 5 and 6 to form the rigid handle B. A lever C is
pivotted at in the head A, and provided with a downwardly projecting treadle
rod Q, having the foot-pins y. This rod in the modification shewn in Figures 3,
4, 5 and 6 is omitted, the lever being elongated to form the lower handle of
the set.
The head A is secured to a bench R by the bolt and nut 13, the bolt passing
through the bed 15 of the setting device proper, and a vertical opening 14 is formed
in the table of the bench for receiving the rod Q. In the modifications shewn in
Figures 3, 4, 5 and 6, the bed 15 is omitted; or it may be said to be elevated
above the plane of the lever C to form the handle B, said lever in Figure 1 being
identical with the lower handle in Figure 3.

page_text: A horizontally arranged clamp-lever D is pivotted at f in the head A, said lever
being projected forward of its pivot to form the movable upper jaw v of the set,
the lower jaw d being rigid and formed integral with the head A. A set-lever E
is also pivotted at m in the head A, and provided near its rear end with an
adjusting screw H and set screw J, for fastening the adjusting screw; but the
latter may be omitted, if desired.
The lever E projects forward of the jaw v, as shewn at r, and is curved down-
wardly to such an extent that its point i comes below the jaw when the set is
closed. The lower jaw d is level at a point immediately under the jaw v, or is in
parallelism therewith from a to z, but from z to t it is inclined downwardly.
A gauge K is attached to the lower jaw by means of the screw N; by which it is
also rendered adjustable on said jaw longitudinally of the head A, to determine
the distance the teeth of the saw are to be inserted in the jaws of the set.
An auxiliary gauge 17 is also employed to regulate the gauge K, the gauge 17
being U-shaped and arranged horizontally, its rear end resting on the bed 15, and
its forward ends against the upper portion of the gauge K, its sides being supported
in ways 10 attached to the sides of the head A. Projecting outwardly from the
bed 15 there is a stud 19; and arranged to work horizontally therein is a screw 20,
said screw being adapted to engage the rear end of the auxiliary gauge 17 and push
it forward against the upper portion of the gauge K, thereby enabling said last-
named gauge to be adjusted with great nicety. In the modification represented
in Figures 3, 4, 5 and 6, the auxiliary gauge and its adjusting screw are not
shewn.
An opening or elongated slot 6 is formed in the curved end of the lever E,
through which the jaw v may be seen when using the set, thereby enabling the
upper jaw to be properly adjusted on the tooth of the saw.
In the use of my improvement as illustrated in Figures 1 and 2, or when it is
operated by foot-power, the saw is held horizontally in the hands of the workman,
and the tooth to be operated on is inserted between the jaws v, d, until the
adjoining teeth of the saw strike the side-pieces of the gauge K, these side-pieces
being turned inwardly at their upper ends to form hooks w which rest upon or
engage the lower jaw d.
When the tooth is in position between the jaws, the rod Q is pushed back by
the foot of the workman, placed on the pin y, causing the lever C to press against
the underside of the rear end of the lever D ate thereby raising the lever D and
causing the jaws to close onto or grasp the tooth. At the same time (the screw H
resting on the rear end of the lever D) the rear end of the lever E will be raised
and its point i depressed, said point being brought into contact with the body of
the saw and bending or setting the tooth in a manner which will be readily
understood without a more explicit description.
In the use of the improvement as illustrated in Figures 3, 4, 5 and 6, or when
operated by hand-power, the saw is placed on its side on any convenient bench
with its teeth projecting slightly over the edge of the same. The set is then taken
in the hand and the tooth to be operated on is inserted between the jaws vd,
which are closed thereon by the handles B, C, whereby the tooth is "set" or bent
in substantially the same manner as already described.
By turning the screw H in or out, a greater or less "set" or angle may be given
to the tooth, as required.
It will be obvious that when the jaws vd have fully closed onto the tooth the
rear ends of the levers D, E will cease their upward movements, and the point i of
the setting-lever will cease to descend; and hence when the tooth is very thick or
nearly fills the space between the jaws the rear end of the lever E will be raised
but slightly and ita forward end or point i descend a corresponding distance, thus
automatically governing the set of the tooth in accordance with its thickness. This
feature of my invention is a very important one, as it is essential that all of the
teeth should "range" perfectly when the saw is set, or that their outer edges should
be in line. When a saw becomes worn, or when it is thinner in some places than

page_text: at others, it is difficult to set it properly by means of the ordinary saw set: This
difficulty is fully overcome by my invention, as the less the thickness or diameter
of the tooth the more set it will receive, and vice versa, the point i descending
a greater distance when the tooth is thin than when it is thick, for the reasons
stated.
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
First. In a saw-setting apparatus, the combination of the head A, clamp-lever D,
lever C, rod gauge K, and set lever E provided with the screw H, substantially
as described.
Second. In a saw-setting apparatus the auxiliary gauge 17 and screw 20, in
combination with the gauge K, substantially as, and for the purpose, set forth.
Third. In saw-setting apparatus the head A having a fixed lower jaw and
provided with a fixed handle B, in combination with a clamp-lever pivotted in
said head and forming a movable upper jaw; a set-lever also pivotted in said head
and adapted to engage the body of the saw automatically when the clamping-jaws
are closed, the outer end of said set-lever being provided with a slot; a screw for
adjusting said set-lever; a pivotted handle for operating said levers simultaneously;
and an adjustable gauge for determining the distance the tooth may enter the jaws,
substantially as described.
Fourth. In saw-setting apparatus, the head A having a fixed lower jaw and
provided with a fixed handle B, in combination with a clamp-lever pivotted in
said head and forming a movable upper jaw; a set-lever also pivotted in said head
and adapted to engage the body of the saw automatically when the clamping jaws
are closed, the outer end of said set-lever being provided with a slot; a screw for
adjusting the inner end of said set-lever upon the inner end of the said clamping-
lever; a pivotted handle for operating said levers simultaneously; and an adjustable
gauge for determining the distance the tooth may enter the jaws; substantially as
described.
Fifth. In saw-setting apparatus, the head A having a fixed lower jaw and
provided with a fixed handle B, in combination with a clamp-lever pivotted in
said head and forming a movable upper jaw; a set-lever also pivotted in said head
and adapted to engage the body of the saw automatically when the clamping-jaws
are closed, the outer end of said set-lever being provided with a slot; a screw for
adjusting the inner end of said set lever upon the inner end of said clamping-lever;
a set-screw for fastening said adjusting screw; a pivotted handle for operating said
levers simultaneously; and an adjustable gauge for determining the distance the
tooth may enter the jaws; substantially as described.
Sixth. In saw-setting apparatus, the head A having the shoulder L, and provided
with fixed handle B, in combination with levers having jaws for clamping and
setting the saw-teeth; and the pivotted handle C for operating said levers, the
inner end of said handle abutting against said shoulder, whereby it is limited in
its outward movement, substantially as described.