Improvements in Saw-sets.
Year: 1890

page_text: COMPLETE SI DUIFICATIONS
Improvements in Saw-sets.
I, CHARLES MORRILL of 79 Chambers Street, New York, United States of America,
Hardware 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 novel improvements in saw-sets having an adjustable or
fixed anvil and a horizontally moving hammer, together with a device for adjusting
the saw preparatory to having its teeth set in the position desired.
Saw-sets as heretofore constructed were provided with a horizontally moving
hammer having
a portion of its body flattened and adapted to engage with a corre-
sponding opening, made in the vertical wall, of the main body of the device, thus
preventing its turning when in operation. The rear end of the said hammer was also
provided with a plain surface arranged at right angles to the horizontal centre
thereof, and adapted to engage in frictional contact with the cam-end of the punch
handle of the device. The main body of these saw-sets were also provided with an
adjustable guide-plate adapted to move horizontally when adjusting the saw to be
operated upon.
I find that constructing the hammer with its flat surfaces as also the corresponding
perforation in the vertical wall of the main body of the device, are objectionable from
the fact that it requires a considerable amount of labour, and thus increasing the cost
of manufacture. 1 propose to simplify the construction in this respect, as also that
of the adjustable guide-plate and thereby reduce the amount of labour and cost of
manufacture.
The foregoing objections are obviated by my invention, which consists first of a
cylindrical hammer having its rear end concaved and adapted to work in frictional
contact with a correspondingly shaped cylindrical portion integral with the lower end
of the fulcrumed punch-handle of the device.
My invention also consists of the adjusting device composed of a single screw
arranged on the under side of the main body of the device and at a suitable depending
angle to the horizontal centre thereof.
The accompanying drawing represents a vertical section of a complete saw-set, in
which is shown the main features of my invention.
Similar letters refer to similar parts throughout the drawings, in which a, represents
the punch-handle-holder and b, the main body. The forward portion thereof is pro-
vided with the depending lug c, having an internally screw threaded perforation, the
latter being adapted to receive the adjusting screw d, which is arranged at a suitable
angle to the horizontal centre of the main body b. The extreme forward end of the
device is, of course, provided with the ordinary adjustable anvil e, the latter of which
is operated upon by the cylindrical and horizontally moving hammer f. The rear end
of the latter is provided with the concavity g, which is adapted to work in frictional
contact with the cylindrical projection h, integral with the lower end of the punch-
handle i. The hammer is held in proper alignment by means of the perforations made
in the vertical walls k, of the main body b, of the device, and is carried back to its
normal position by means of the retracting spring 1.
MODUS OPERANDI.
The adjusting screw is first set forward so that when the blade of the saw is passed
inwardly on a line indicated by the dotted line m, the plane thereof will be at right

page_text: concaved end of the hammer and forces it forward against the tooth, thereby pressing
the latter against the vertical plane of the anvil and thus giving the tooth the proper
bend.
It will be obvious that the concavity on the rear end of the hammer aforesaid
will, while in contact with its corresponding abutting surface of the punch-handle
prevent the same from turning.
Having thus particularly described my invention, I declare that what I claim as new
and desire to secure by Letters Patent is :-
1. The combination with a saw-set having an adjustable or fixed anvil and saw
adjusting device, of a horizontally moving cylindrical hammer having a concaved
end adapted to work in frictional contact with the cylindrical projection on the lower
end of the punch handle, substantially as shown and described.
2. The combination with a saw-set having an adjustable or fixed anvil and hori-
zontally moving cylindrical hammer; of the saw adjusting device composed of a screw
arranged at a suitable angle to the horizontal centre of the main body of the device,
and supported by the correspondingly depending screw-threaded lug arranged on the
under side of the device, substantially as shown and described.
Dated the 1st day of December 1890
ROBT. F. J. DRURY,
Bank Buildings, George Street, Sheffield, Agent for the Applicant. .