AN IMPROVED HAND-DRILL STOCK
Year: 1860

page_text: LETTERS PATENT to Edward Halliday Ashcroft, of Boston, in the State of
Massachusetts, of the United States of America, for the Invention of
"AN IMPROVED HAND-DRILL STOCK."-Partly a communication by Henry
Sealed the 5th June 1860, and dated the 4th April 1860.
COMPLETE SPECIFICATION filed by the said Edward Halliday Ashcroft
at the Office of the Commissioners of Patents, with his Petition aud
Declaration on the 4th April 1860, pursuant to the 9th Section of the
Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, BE IT KNOWN
that I, EDWARD HALLIDAY ASHCROFT, of Boston, in the State of Massachusetts,
of the United States of America, am in possession of an Invention of "AN
IMPROVED HAND-DRILL STOCK," the same having been partly my own Invention
and partly communicated to me by Henry H. Packer, of Boston, in the
State of Massachusetts, and I do hereby declare that the nature of the
said Invention and the manner in which it is to be performed or is con-
structed and operates, are fully described and represented in the following
Specification and the accompanying Drawings, that is to say:―
The nature of the said Invention consists in the combination of one or more
tubular protectors or caps, with the male and female screws, the tubular shank
of the female screw, the centre pivot, and a drill carrier provided with a

page_text: ratchet and operating pawl or click, and a hand lever as herein-after
specified.
The nature of such Invention further consists in certain arrangements of
the protector or protectors, the screws and tubular shank with reference to each
other, the pivot and drill carrier.
Figure 1 of the Drawings represents a side elevation of my improved hand-
drill or drill operating mechanism; Figure 2 is a vertical section; and Figures 3
and 4 are horizontal sections of the same. Figure 5 is an elevation of the
drill, exhibiting a different mode of applying and arranging some of its
operative parts; Figure 6 is a longitudinal section; and Figures 7 and 8 are
horizontal sections of it in this last system or mode of constructing it.
In the Drawings A exhibits a drill carrier or holder as furnished with a ratchet
B, and a handle or lever C so applied to such carrier A as to be capable of being
turned on it as a fulcrum. The said hand lever carries a spring pawl or click E,
so formed and applied to such lever as not only to readily engage with the ratchet
when the lever is being moved in one direction, but to slip over the teeth of
the ratchet while the lever may be in the act of being moved in the opposite
direction. Thus if the lever be turned one way the drill carrier will be caused
to revolve, but an opposite movement of the lever will produce no rotary move-
ment of the drill carrier. In the lower part of the drill carrier is a socket a
for the reception and support of a drill or boring tool. In connection with
the drill carrier a separate centre or conical pivot F is employed. This pivot
is applied either to the head of a male screw G, as shown in Figure 2, or to
the tubular shank H of a female screw I, as shown in Figure 6. In Figure 2
the tubular shank H of the female screw I, which receives the said male
screw G, is projected axially from the drill carrier A, while in Figure 6 the
male screw G is represented as so projected from the drill carrier A. The
shank H is to be cylindrical. Furthermore, a protector cap K, tubular and
cylindrical in form, is shown in Figures 1 and 2 as projected down from the
head of the screw G or its pivot F, and made to encompass the said screw and
the shank H, the inner diameter of the said cap being equal to or a little
greater than the diameter of the part H. Furthermore, in Figures 5 and 6
the protector cap K is represented as extended directly from the drill carrier and
concentrically with the screw G and the shank H; in this latter case the
space immediately around the screw G and within the cap K may be made to
serve as a receptacle for holding oil to lubricate both of the screws as well as
the surfaces of the parts H and K, which may run in contact. If desirable, a
hole or passage may be made through or near to the screw I, as seen at 6 in
Figure 6, the purpose of such hole being to permit the oil to pass from the

page_text: part K into the bore of the tube H whenever the drill stock may be inverted.
In order to supply the interior chamber of the cap K with lubricating fluid,
a passage c may be formed down, along, and in the inner surface of the part K,
as shown in Figure 6. The part K, arranged as shown in Figure 2, serves as
a handle for a person to grasp and hold the screw G and the pivot F stationary
while the drill carrier may be put in revolution, the same operating to cause
the drill to be fed or moved downward. By grasping the part H of Figure 6,
or a milled handle e made thereon, the screw I may be held stationary while
the drill carrier may be in the act of being put in revolution. If desirable
another tubular cap may be extended either from the part A of Figure 2, or
the head of the part H of Figure 6, and made to encompass the cap K, the
object of each cap, and particularly the cap K, being to protect the parts
surrounded by it from dust, shavings, or extraneous matters, which by getting
on the surfaces in contact, or on the screws, would mix with the lubricating
matter, and either produce friction or wear of the parts. It also serves to give
steadiness to such parts while the apparatus may be in use.
Figures 9 and 10 represent sections of the drill mechanism as shown in.
Figures 2 and 6, and as having an additional cap L applied as above stated.
A drill apparatus or operative mechanism so made will be found very useful
and convenient to machinists.
I claim the combination of one or more tubular protector caps K, L, with
the male and female screws G, I, the tubular shank H of the female screw I,
the centre pivot F, and a drill carrier A provided with appliances for rotating.
it as described. I also claim each separate arrangement above described of
the protector cap, the screws, and tubular shank with reference to each other,
the pivot and the drill carrier. I also claim so connecting the screw chambers
by one or more passages separate from the female screw that oil may pass
from one chamber into the other under circumstances and for the purpose set
forth.
In witness whereof I have hereunto set my hand and seal this 13th
EDWARD HALLIDAY ASHCROFT. (L.S.)