Improvements in Bush Hammers.
Year: 1893

page_text: Improvements in Bush Hammers.
A communication from JAMES O'DONNELL, of 116, Duke Street, Toronto, County
of York, Province of Ontario, Canada, Stone Cutter, and CHARLES WATSON,
of 115, Mutual Street, Toronto, aforesaid.
1, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Chartered Patent Agent, 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 the invention is to provide a bush hammer which may be quickly
and easily sharpened and tempered, and in which the teeth may be readily replaced
in the event of any one of them being broken, and it consists essentially of a casing
designed to hold a series of pointed teeth bunched together and held in position by
means of a wedge substantially as hereinafter more particularly explained.
The drawing is a perspective view of the improved bush hammer partially
broken away.
In the drawing A represents a double-ended casing through the centre of which
a hole is made for the handle B.
A series of pointed teeth C are bunched together and fitted into each end of the
casing A. These teeth are made of steel and pointed as indicated each point being
properly hardened and tempered.
The stub end of each tooth is bent at C¹, the teeth being arranged as indicated
in the drawing so that they shall fit up closely to each other into a dove-tailed
recess a, made in the case of the casing A, so that when the wedge D, is driven
into the casing A, behind the teeth C, the said teeth are rigidly held in position so
that they cannot fall out either separately or collectively until the wedge D has
been removed.
It will be noticed that both ends of the casing A are similarly filled with teeth so
as to make the hammer double-ended as is the case in all bush hammers. The
insertion of the handle E locks the wedge in position so that the said wedges cannot
be removed until the handle is knocked out of place. A narrow channel F is made
in each end of the case A immediately in front of the edge of each wedge D, so that
by removing the handle each wedge can be knocked out by inserting a punch in
the end of the channel F and knocking the said wedge out of position by means of
the said punch.
Among the advantages of this improved hammer over the old style of hammer, it
may be mentioned that the teeth being made separately, they can be removed for
the purpose of being sharpened or in the event of being broken, and may be
re-inserted without the slightest difficulty or loss of time; whereas in the old style
of solid bush hammer, it is necessary to employ a skilled artisan to sharpen or
repair the teeth in the event of their requiring attention; whereas in this hammer
an ordinary blacksmith is able to do the necessary work and in many cases a handy
man is sufficient. In this improved hammer it is merely necessary to keep a few
sets of teeth sharpened and tempered to suit the different kind of stone and they
can be changed in the hammer by the party using it. When a tooth is broken it is
only necessary to replace a single tooth instead of being obliged to cut down all the
remaining teeth in order to make the hammer even.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondents, and in what manner
the same is to be performed, I declare that what I claim is ;-
=
1. A series of bush-hammer teeth C bent at C' substantially as and for the
ecified

page_text: 2. A bush-hammer casing A having a dovetail a formed on one side of the said
casing substantially as and for the purpose specified.
3. As an improved bush hammer a casing designed to hold a series of pointed
teeth bunched together and held in position by means of a wedge substantially as
and for the purpose specified.
4. A casing A having a dovetail a formed on one side of it a series of teeth C
each tooth bent at C' and arranged in a bunch to fit together and into a dovetail a
in combination with the wedge D and handle E substantially as and for the purpose
specified.
Dated this 30th day of August 1893.
W. P. THOMPSON & BOULT,
Agents for the Applicant.