AN IMPROVEMENT OR IMPROVEMENTS ON HAMMERS OR TOOLS FOR DRESSING STONE
Year: 1877

page_text: LETTERS PATENT to Alexander McDonald, of the State of Massachusetts, of
the United States of America, for the Invention of "AN IMPROVEMENT OR
IMPROVEMENTS ON HAMMERS OR TOOLS FOR DRESSING STONE." A com-
munication from John Hartnoll, of the State of New Hampshire, in the
. United States of America.
Sealed the 23rd February 1877, and dated the 9th January 1877.
COMPLETE SPECIFICATION filed by the said Alexander McDonald at the
Office of the Commissioners of Patents on the 9th January 1877.
ALEXANDER MC DONALD, of the State of Massachusetts, of the United States of
America. "AN IMPROVEMENT OR IMPROVEMENTS ON HAMMERS OR TOOLS FOR
DRESSING STONE," A communication from John Hartnoll, of the State of New
Hampshire, in the United States of America.
Figure 1 is a side elevation; Figure 2, a top view; Figure 3, a longitudinal and
vertical section; and Figure 4, a longitudinal and horizontal section of a stone dress-
ing hammer head provided with or embodying my Invention.
The first part of my Invention consists in a stone dressing hammer head, pro-
vided with a slit and a tapering recess arranged in it, as set forth.
The second part of my Invention consists in a stone dressing hammer head pro-
vided with a slit, a tapering recess, and jaws, all as set forth.
The third part of my Invention consists in a stone dressing hammer head pro-
vided with the slit, the tapering recess, and jaws, and a collar applied to such head,
all being as set forth.
The fourth part of my Invention consists in a stone dressing hammer head pro-
vided with the slit, the tapering recess, a wedge, and a series of chisels, all as and
arranged as set forth.
The fifth part of my Invention consists in the stone dressing hammer head pro-
vided with the slit, the tapering recess, and jaws, the series of chisels, and a wedge,
arranged as set forth.
The sixth part of my Invention consists in the stone dressing hammer head pro-
vided with the slit, the tapering recess, and jaws, the series of chisels, the wedge, and
the collar, all arranged and constructed substantially, as specified and represented.
The seventh part of my Invention consists in the combination of a bridge

page_text: piece, as herein-after described, with the recessed and slotted hammer head and its
wedge and cutters, arranged as set forth.
The hammer head, exhibited at A, is provided at its front end with a tapering
recess a, as shown, for the reception of a series of dressing tools or chisels B, B.
From the middle of the base of such recess, the head is slitted, as represented at
b, through the handle eye c, and nearly to the but or rear end of the head.
Furthermore, the parts d, d, which flank the recess, constitute jaws to hold the
series of chisels in place. Each of the said jaws d, d, is wedge shaped or tapers,
as represented at ff, to co-operate with a collar C in securing the chisels. This
collar circumscribes the head transversely, and on being driven against the tapering
onter surfaces of the jaws d, d, will crowd the said jaws toward each other, and
tightly against the series of chisels. Between the two middle chisels there is placed
a wedge D, it being arranged with them in manner as represented. It serves to
spread the series in opposite directions in the recess, and with the jaws and collar
operates to confine the chisels to the head. The slit of the head enables the jaws to
be readily closed on the series of chisels. Within the eye of the head, a handle is to
be inserted.
In order to support the chisels at their inner ends, and to prevent the wedge D
from being driven into the slit b, there is arranged in the recess a, in manner, as
shown, an abutment or bridge piece G of metal, which on its front surface may be
formed, as shown, or may be concave or convex. When the said face is curved, the
cutting edges of the chisels become arranged in a corresponding curve, it being
sometimes desirable to so dispose them.
I claim as my Invention, as follows:-
First. The stone dressing hammer head A, provided with the slit b, and the
tapering recess a, arranged in it, as set forth.
Second. The stone dressing hammer head A, provided with the slit b, and the
tapering recess a, and jaws d, d, as set forth.
Third. The stone dressing hammer head A, provided with the slit b, the tapering
recess a, and jaws d, d, and the collar C, applied to such head, as set forth.
Fourth. The stone dressing hammer head, provided with the slit b, and the taper-
ing recess a, the wedge D, and the series of chisels B, arranged as set forth.
Fifth. The stone dressing hammer head A, provided with the slit b, the tapering
recess a, and jaws d, d, the series of chisels B, and the wedge D, arranged as set
forth.
Sixth. The stone dressing hammer head A, provided with the slit b, the tapering
recess a, and jaws d, d, the series of chisels B, the wedge D, and the collar C, ar-
ranged as set forth.
Seventh. The stone dressing hammer head, recessed and slitted, as described, and
provided with the wedge, chisels, and bridge piece, all being substantially as
specified.
In witness whereof, I, the said Alexander McDonald, have hereunto, set my
hand and seal this Twenty-third day of December. 1876.
ALEXANDER M'DONALD.