Year: 1887

page_text: Date of Application, 12th Apr., 1887.
Specification Accepted, 20th May, 1887.
1, REGINALD HADDAN, of the firm of Herbert & Co., Patent Agents, of 67, Strand,
London, in the County of Middlesex, Civil Engineer, 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:-
The object of this invention is to provide a simple and cheap instrument with which
saws may be set without breaking or otherwise injuring the teeth. Saw-makers and
wood-working mechanics claim that the most desirable way to set a saw to obtain the
best results is to merely set the points of the teeth. I attain this by the peculiar
construction of the hammers and anvils.
Figure 1 shows a detailed view, in perspective, of the instrument. Fig. 2 is a
sectional view; Fig. 3, a view of the cam F, with indicator; Fig. 4, an end view of
the four different hammers on the plunger A, and Fig. 5 a sectional view of
the anvil.
Similar letters refer to similar parts throughout the different views.
The bed-plate H is provided with a sleeve, L, which acts as a guide for the
plunger A, and is further provided with reversed V-bearings, upon which the table D
rests. The plunger A is provided with four different sized hammers, and is made of
hardened steel, and is constructed as shown in Figs. 1, 2, and 4. The hammers on
the plunger are numbered 1, 2, 3, and 4.
The anvil B is formed with four beveled edges, the bevels corresponding in width
to those on the hammers, and are also numbered 1, 2, 3, and 4. The anvil is fastened
to the bed-plate H by the screw J, and is held firmly in place by bearing on flat
surfaces on the sleeve L, and a shoulder on the bed-plate at z, on the bed-plate H.
The anvil B forms a guide to the plunger A by pressing against the square surfaces
on the plunger, between the hammer and the shoulder M on the plunger. The anvil
also acts as a stop, which keeps the plunger from rising above a certain point by

page_text: coming in contact with the shoulder M on the lower end of the plunger A as the
spring a forces the plunger upward.
The table D is used for the purpose of giving the different widths of set to the
teeth, or the different bevels required to properly set the teeth, and is operated by
revolving the cam F, and the motion is attained by a projection on the rear end of the
table D, working in a groove in the cam F at f¹. The different bevels are given by
the indicator f passing over a numbered disk on the bed-plate H. The top-gage, C,
is for the purpose of keeping the saw-teeth from coming in contact with the square
surfaces of the plunger A; it slides on top of the table D, and prevents the table D
from rising out of its bearings. The thumb-screw G passes through a slot in the
gage C and through the cam F and screws into the bed-plate H, and when screwed
down tight it holds the gage C, the table D, and the cam firmly in place.
The sliding rest is formed, as shown in Fig. 1, by fastening a properly-constructed
foot on each end of a small rod, i. The rod slides through bearings h on the bed-
plate H. The sliding rest is for the purpose of holding the saw parallel while passing
under the hammer, and will not allow it to buckle or hang over, as is the case in
setting saws with the hammer-sets now generally used.
The steel plug I is screwed into the bed-plate H under the plunger A, and is for
the purpose of preventing the hammers from breaking or otherwise injuring the
set-teeth. To operate it properly, first press the plunger down until the shoulder M
on the plunger rests on the plug, then screw up the plug, until it will raise the hammer
off the anvil, leaving the space between the hammer and anvil equal to the thickness
of the saw-blade. If properly used, it is impossible to injure the saw-teeth. In
setting a saw, first get the desired pitch to the table D by turning the cam F, then
slide the top gage forward until it will prevent the saw-teeth from coming in contact
with the square surfaces of the plunger A, then fasten them in place by the thumb-
screw G, then place the saw on the table j, letting the teeth rest on the anvil B, with
the point of the tooth to be set opposite the vertical line on the flat surface of the
plunger under the hammer, strike the top of the plunger with the palm of the hand or
a light mallet. A light blow is sufficient to perform the operation.“
Having now particularly described and ascertained the nature of the said invention
as communicated to me by my foreign correspondent and in what manner the same is
to be performed, I declare that what I claim is:—
The combination of the bed-plate H, the plunger and hammer A, the anvil B, the
table D, the cam F, with the indicator f, the thumb-screw G, the top-gage C, and the
sliding table j, all substantially as described, and for the purpose set forth.
0
1.
1007
REGINALD HADDAN.
By Herbert & Co.,
67, Strand, W.C.,
Agents to Applicant.