Improvements in Granite Hammers.
Year: 1892

page_text: Date of Application, 23rd Sept., 1892-Accepted, 29th Oct., 1892
COMPLMIM DI ECIFICATION.
Improvements in Granite Hammers.
A communication from abroad by PERRY DENHAM, of Sandford, Vigo County,
Indiana, Farmer, and GEORGE SKINNER, of the Indianapolis, Decatur and
Western Railway, Chrisman, Edgar County, Illinois, Station Agent, both in
the United States of America.
1, WILLIAM GRACE MIHILL of 105 Edward Street, Brighton, in the County of
Sussex, Grocer, 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 granite-hammers that are composed of a
number of metallic plates or blades which are fastened firmly together, and when
so fastened the several edges of the blades taken together present a rigid surface
for dressing stone.
The objects of my invention are to provide a hammer that will be strong and
substantial and a means of sharpening the several edges of the blades that will be
more accurate and time-saving than similar tools used heretofore. I attain these
objects by the mechanism illustrated in the accompanying drawings, in which :-
Figure 1 is a perspective view of the hammer when ready for use.
Fig. 2 is a view of the hammer when it is prepared for grinding the edges of the
blades.
Fig. 3 is a view of the blades, showing the position of the different perforations.
Fig. 4 is a view of the blades removed from the handle, but arranged for
grinding, and showing the position of the various perforations while so arranged.
Fig. 5 is an elevation of the longitudinal edges of the blades 6 in the position
for use, showing by dotted lines the perforations e¹, el, g, and y'.
Fig. 6 is an elevation of the longitudinal edges of the blades in position for
grinding, showing by dotted lines the perforations e', e¹¹, g, and g¹.
Similar letters refer to similar parts throughout the several views.
The letter indicates a strong hard-wood handle, one end of which is enlarged
and planed square, as seen in Figs. 1 and 2.
The letters ppl indicate two strong flat plates, usually of malleable iron, which
are bolted upon opposite sides of the handle h. These plates extend beyond the
end of the handle and thus form a fork upon the end of the same, within which the
plates or blades are clamped. The plates p pl are perforated to receive
the bolts d and d', by means of which the plates are fastened upon the handle, the
bolts c, c, c, and the peg i, the purpose of which is set forth hereinafter.
The letter bindicates a strong steel blade, a number of which are shown in
Figs. 3 and 4. The blades b b are sharpened at each end to a V-shaped edge, and
the bevels leading to said edges are at an angle of forty five degrees to the
sides of the blades. Each plate is perforated at the centre by a long slot O, each
end of which is rounded, and at g and g', as explained hereinafter, and shown in
the Figs. 3 and 4.
The hammer-head is composed of twelve or any other desired number of blades b.
By sliding the blades one upon the next succeeding one all of the sharp edges of the
same can be brought to lie in one plane, which plane is generally at an angle of
forty five degrees from the plane of the blades b, and consequently the bevels of the
edges of one side of the blades, which are also at an angle of forty-five degrees,
will all lie in one plane. While the blades are thus arranged, as shown in Fig. 4,
I make a perforation g through the entire mass at right angles to the planes of the
blades to receive the peg i, which serves to hold the blades in such position. By
sliding the blades upon each other in the opposite direction the other bevels of the

page_text: edges can be brought into the same plane and at an angle of forty five degrees from
the planes of the blades, when a perforation g¹ can be made through the mass of
blades at right angles to the same to receive the peg i, thus fixing the blades firmly
in such position.
Having prepared the blades 6 in the manner just described, I place the blades
within the fork or clamp formed at the end of the handle h, where they are firmly
fastened by means of the bolts c and c¹. If I wish to sharpen the blades now, I
pass the bolt c" through the perforation at the middle of the plates p p', and
consequently through the slots o of the blades, as shown in Fig. 2. Then slide the
blades upon each other until their edges are all in the same plane, said plane being
at an angle of forty five degrees from the plane of the blades, and by so doing the
bevels of one side of the edges of the blades are brought into the same plane
and the perforations 9 of the several blades are brought opposite to each other and
the perforations e¹. Then I pass the peg through said perforations, and thereby
fasten the blades in such position in the fork of the handle. I now tighten the
bolt cand placing the bevelled ends of the hammer-head upon the grinding wheel
the edges of all the blades are ground evenly and at exactly the same angle.
Having ground the two sets of bevels in this position, I loosen the bolt c", remove
the peg, and then slide the blades upon each other in the opposite direction until
the other bevels of the blades are in the same plane and the peg i may be passed
through the perforations g¹ and e". Then tightening the bolt the remaining
bevels may be ground down similar to those of the other side of the blades.
Having ground the edges of the blades, as desired, it is only necessary to remove the
pegi and the slide blades back until the edges are brought into one plane at right
angles to the plane of the blades, insert and tighten the bolts c and cand the hammer
is ready for use, as shown in Fig. 1.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed I declare that what I
claim is :
The combination in a granite-hammer, of a handle h, to which are fastened two
metallic plates or clamps p p', said clamps being perforated to receive the
bolts d dc cc and the peg i, with a number of blades b, both ends of which are
ground to a V-shaped edge, said blades being perforated at the middle by a slot o
and at g g in the different blades, being so situated that when the blades are brought
into position for grinding they will stand opposite to each other and receive the peg i,
all as and for the purpose set forth and specified.
Dated this 23rd day of September 1892.
THOMAS H. MELLOR,
110, St. James's Street, Brighton, Agent for the Applicant.