Improvements in Drills and Undercutters Combined, for Drilling and Undercutting in Steel, Iron, Brass, Metal, Stone, and other kindred Materials.
Year: 1895

page_text: Date of Application, 28th Dec., 1895
Complete Specification Left, 2nd May, 1896-Accepted, 25th July, 1896
PROVISIONAL SPECIFICATION..
Improvements in Drills and Undercutters Combined, for Drilling
and Undercutting in Steel, Iron, Brass, Metal, Stone, and other
kindred Materials..
JAMES ALFRED DERHAM, 12 Maudland Bank Preston, Lancashire, Boiler
Maker. I do hereby declare the nature of this invention to be as follows:-
My invention consists of two cutters cut to a suitable radius from the outside
bottom edge inward, and hinged from one centre at the top end to a round steel
spindle cut out in the form of a jaw to receive them.
The cutters and part of the spindle are enveloped by a loose metal sleeve solid
or partly solid at the bottom end and provided with two slots or openings in the
sides and radiused out at the bottom to suit the radiused part of cutters.
This sleeve is also provided with a nib or piece of steel in the form of a drill
attached to the bottom or solid part and at right angles to the cutter slots and
cutters which admits of a hole being drilled and then by operating the cutters the
same hole may be undercut or made wider at the bottom than at the top.
This invention is adaptable for drilling and undercutting holes in weights for
the reception and retention of lead for adjusting purposes also for letting white
metal into bearings to reduce friction.
Dated this 27th day of December 1895.
COMPLETE SPECIFICATION.
Improvements in Drills and Undercutters Combined, for Drilling
and Undercutting in Steel, Iron, Brass, Metal, Stone, and other
· kindred Materials.
JAMES ALFRED DERHAM Number 12 Maudland Bank Preston in the County
of Lancashire, Boiler Maker. I 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:-
This invention has for its object the construction of a drill and undercutter
combined for the purpose of drilling and undercutting holes in steel, iron, brass,
metal, stone and other kindred materials, when the said holes have not been drilled
entirely through the above mentioned steel, iron, brass, metal, stone and other
kindred material, but only partly through.
Such being the nature and object of my invention I will now describe the
particulars thereof which will be fully understood by the following description,
aided by the annexed drawings.
In all the figures similar letters represent similar parts.
Fig. 1 is a sectional elevation view of the drill and undercutter combined when
the hole is being drilled.

page_text: Fig. 4. a sectional view on line H. J.
Fig. 5. plan of bottom of sleeve c.
My invention consists of two cutters f. f. cut to a suitable radius from the outside
bottom edge inwards, and hinged from one centre at the top end by the pin e to the
round steel spindle a, which is cut out in the form of a jaw to receive them. The
cutters f. f. and part of the spindle a are enveloped by the loose steel sleeve, c, solid
at the bottom end, and provided with two slots or openings on the two opposite
sides and near the bottom or solid end; and which are radiused out at the bottom to
suit the radiused part of cutters ff. The sleeve c is also provided with a nib g,
or piece of steel in the form of a drill, dovetailed into the bottom or solid end', or
Eccured in any other suitable way, and at right angles to the cutter slots or
openings.
By screwing the small regulating wheel 6 down on the spindle a (which is
provided with a thread for that purpose), the sleeve c is pressed down tight on to
the outside shoulders of the cutters ff, and by doing so the cutters ff are drawn
inwards within the slots or openings and remain so until the hole has been drilled
to the required depth by the before mentioned nib g, or piece of steel in the form
of a drill, after which the small regulating wheel b is screwed upwards to the
proper distance (which may be regulated to give the required size of undercut).
Then on the application of the vertical weight to the spindle a as before, the
cutters are forced down the radiused part of the sleeve c, until the small
handwheel b again touches the sleeve c, whereby the hole is undercut or made
larger at the bottom than at the top.
The driving pin d which works within the two slots at the upper end of the
sleeve e serves the purpose of taking the twisting weight off the jaw of spindle a,
and the cutters ff, while the hole is being drilled or undercut.
The cutters f. f. may be removed at any time by taking out the pin e through a
small hole in the sleeve c, which may be arranged in the most suitable position for
that purpose.
This invention is specially adapted for drilling and undercutting holes in weights
for the reception and retention of lead for adjusting purposes, also for securing
white metal to the iron pedestal on bearings, or for any other purpose where an
undercut hole is required.
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
1. The novelty of and the combination of the various parts herein set forth and
for the purpose hereinbefore described and illustrated by the accompanying
drawings.
2. The loose steel sleeve c.