Improvements in Saw-sets.
Year: 1891

page_text: Date of Application, 4th Sept., 1891-Accepted, 7th Nov., 1891
COMPLETE SPECIFICATION.
Improvements in Saw-sets.
I, CHARLES MORRILL, 79 Chambers Street of the City and State of New York,
United States of America, Merchant, 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 improvements in saw-sets provided with a suitable
housing for the protection of the actuating spring surrounding the horizontal
moving hammer.
The invention also relates to an adjustable guard, all of which will be fully
described and shown hereafter.
Heretofore the actuating spring and hammer of saw-sets have been exposed,
thus enabling the dust and refuse to settle between the convolutions of the spring
and in time clog the same to such an extent as to cause it to become inoperative.
They were also provided with a guard having a broad vertical slot adapted to
accomodate a correspondingly shaped hammer, the latter of which when operating
upon a narrow saw would cause it to buckle, thereby giving the blade of the saw
a curved shape after having its teeth set. I propose to obviate these objections by
my present invention, which will be fully pointed out in the claims.
My invention consists in providing a suitable enclosure, for the reception of the
actuating spring surrounding and connected with the horizontally moving hammer.
It also consists of an adjustable guard, so arranged to enable the operator, to set
the teeth of narrow saws as well as broader ones.
It further consists of the arrangement of the heel of the operating handle, and
the end of the horizontally moving hammer.
In the accompanying drawings:-
Fig. 1, represents a plan view of the device having the adjustable guard
removed.
Fig. 2, represents a longitudinal vertical section of the device, in which is shown
the principal features of my invention.
Fig. 3, is a transverse section of the housing taken on the line X, X, of Fig. 2.
Fig. 4, is a detail view of the hammer.
Fig. 5, is a face view of the adjustable guard detached.
Fig. 6, is a modification of the hammer and heel of the operating handle.
Similar letters refer to similar parts throughout the drawings, in which :-
a, represents the housing, forming a part of the main body of the device, and
b, is the depending lug, having an internal screw threaded perforation, whose longi-
tudinal centre is arranged on a suitable angle to the horizontal centre of the main
body of the device. The screw threaded perforation aforesaid, is adapted to
receive a regulating screw c, the forward end of which is swivelled to the adjustable
guard d, by means of the set screw d', which latter also regulates the friction of
the screw c.
The guard is provided with the vertical narrow slot e, through the
latter of which the narrow or flattened end of the hammer f, passes when in
operation. The rear end of the hammer aforesaid, is provided with a semi-circular
bead g, arranged transversely to the longitudinal centre thereof.
the bead g, terminates in shoulders h, ', the former of which engages normally with
the corresponding shoulder i, forming a part of the heel k, of the operating
handle o, the latter of which is provided with the nose l, which rests normally
upon the upper surface of the housing, thereby regulating the movement of the
hammer rearward.
The base of
It will be observed that the convex portion of the bead g, aforesaid engages
with a corresponding concavity made in the heel k, of the operating handle o,

page_text: In Fig. 6, is shown a toggle connecting the heel of the operating handle, with
the end of the hammer. This, however, will form the subject matter of a subsequent
application for Letters Patent.
It will be obvious that the teeth of narrow saws, can be operated upon when
shifting the guard d, forward as shown in Fig. 2, but when broader saws are to
be operated upon, the guard may be shifted rearwardly as shown by the dotted
lines in Fig. 2.
It will also be obvious that the housing surrounding the actuating spring, will
prevent the refuse which usually accumulates in work shops, from clogging the
spring which is often the case in saw-sets having their actuating springs exposed.
It will also be obvious that the narrowness of the end of the hammer, and
that of the slot of the guard, will enable the operator to set the teeth of narrow
saws, without distorting its straight alignment.
Having thus described my invention, what I claim as new and desire to secure
by Letters Patent is :-
1. The combination with a saw-set, of the main body thereof forming a housing
for the reception of the hammer and its actuating spring, substantially as shown
and described.
2. The combination with a saw-set, of an adjustable guard provided with a
narrow vertical slot, said guard being swivelled upon the forward end of a regulating
screw, and a set screw adapted to hold the guard and regulating screw together,-
and to regulate the friction of said regulating screw, substantially as shown and
described.
3. The combination with a saw-set, of a horizontally moving hammer having its
forward sides flattened, and a semi-circular bead arranged transversely on its
rearward end, said bead terminating in shoulders adapted to engage with corre
sponding means on the operating handle, substantially as shown and described.
Dated the 31st day of August 1891.
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.