Improvements in Hand Power Rock Drills.
Year: 1895

page_text: Date of Application. 27th Aug., 1895-Accepted, 16th Nov., 1895
COMPLETE SPECIFICATION.
Improvements in Hand Power Rock Drills.
I, ROBERT BINNIE (Manager) of Bolivar, in the County of Westmoreland and
State of Pennsylvania, United States of America, do hereby declare the nature of
my 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 new and improved hand drill which is
simple in construction, very effective in operation in any desired position, and
arranged to permit of drilling at any angle and without danger of the drilling tool
getting stuck in the hole.
The invention consists of certain parts and details and combinations of the same,
as will be fully described hereinafter and then pointed out in the claims.
Reference is to be had to the accompanying drawings forming a part of this
Specification, in which similar letters of reference indicate corresponding parts in all
the figures.
Figure 1 is an end elevation of the improvement;
Figure 2 is a sectional front view of the same; and
Figure 3 is a plan view of the improvement with part in section.
The improved hand drill is provided with a tripod A, preferably made with a
double leg A carrying at its feet screws A2, and a single leg B held adjustable in
the middle portion of the double leg A', and adapted to be secured therein by a
set screw A³. On this leg B is secured an angle-iron B', on which is fastened by
a bolt B2 a frame C, provided with guideways C₁ in which is fitted to slide a
carriage D adapted to be raised and lowered by a feed screw E mounted to turn
in the frame C and carrying at its upper end a handle E' adapted to be taken hold
of by the operator, to turn the said feed screw and raise and lower the carriage D
by hand whenever desired. The feed screw E screws in a nut E2 held loosely
between two arms of the carriage D), so that the latter moves with the nut Eas
the said nut screws up or down on the feed screw E at the time the latter is turned.
On the other hand if the nut E2 is turned, a like movement is given to the carriage D,
and for this purpose the nut E2 is made in the shape of a ratchet, as indicated
in the drawings. An intermittent turning motion is given to the nut E2 in the
manner hereinafter more fully described, so as to automatically feed the carriage
during the drilling process.
In the carriage D is mounted to turn and to slide a drill shaft F, formed at its
lower end with a socket F¹, in which is adapted to be fastened by a set screw For
other means, a drilling tool G. The shaft F is provided with reduced journals F³
and F, mounted in a trame H adapted to slide, and carrying wheels I and I
adapted to be engaged alternately by S-shaped cams J and J¹ respectively, secured
on a transversely-extending driving shaft K, journaled in suitable bearings in the
carriage D. On the outer end of this shaft K is secured a hand wheel K adapted
to be turned, so as to rotate the shaft K, and cause the cams J and J' to alternately
engage the wheels I and I to impart an up and down or a forward and backward
sliding motion to the frame H, so that the latter moves the feed drill shaft F in the
same direction.
On the driving shaft K is secured a worm L in mesh with a worm wheel L'
through which passes the drill shaft F and which is engaged at a longitudinal
groove by a key F secured on the drill shaft F. When the driving shaft K is

page_text: rotated, the worm L will turn the worm wheel L', and consequently the drill
shaft F at the same time, permitting the latter to slide up and down or forward and
backward in the worm wheel L', which latter is held between two bars of the
carriage D, see Figure 2.
The extreme upper end of the drill shaft F is provided with a double cone-
shaped head F adapted to alternately engage the arms N' and N2 projecting from
a panl N, mounted to slide on the carriage D and provided with a pawl arm N³
adapted to engage the teeth of the ratchet nut E3, and in which screws the feed
shaft E as previously mentioned. A spring presses on the pawl arm N³, so as to
hold the latter in contact with the teeth of the ratchet nut E.
The operation is as follows:
When the several parts are in the position illustrated in the drawings and the
shaft K is turned, the S-shaped cams J and J' impart a sliling motion to the drill
shaft F, so as to cause the drilling tool G to drill a hole whether the carriage D is
in a vertical position for drilling up or down, or in a horizontal position. Besides
the sliding motion given to the shaft F, an intermittent rotary motion is given the
same by the worm L and worm wheel L', and a feed motion is given to the
carriage D and the parts mounted thereon, from the said drill shaft by the head F
alternately engaging the arms N' and N³, to more the pawl N forward and
backward, to turn the ratchet nut E².
It will be seen that by the arrangement described, a very uniform motion is
given to the drill shaft F and the tool G carried thereby, so that the said drilling
tool is not liable to get stuck in the hole, as the shaft F is turned at each stroke.
It will further be seen that the entire hand drill can be readily set in any desired
position, or moved about from place to place.
Having pow 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. In a drill, the combination with a carriage, of a drill shaft mounted therein, a
sliding frame secured to the drill shaft, a driving shaft, cams on the driving shaft
and engaging the said sliding frame, a worm on the driving shaft, and a worm
wheel in which the drill shaft is mounted to slide, but to turn therewith, substan-
tially as described.
2. In a drill, the combination with a frame and a carriage mounted thereon, of a
drill shaft mounted in the carriage, a sliding frame secured to the drill shaft and
provided with wheels, a driving shaft, cams on the driving shaft and engaging the
wheels of the sliding frame, a worm on the driving shaft, and a worm wheel in
which the drill shaft slides, the said shaft having a key and groove connection with
the said worm wheel, substantially as described.
3. In a drill, the combination wit a frame and a carriage fitted to slide thereon,
of a ratchet nut mounted in the carriage, a feed screw mounted in the frame and
passing through the ratchet nut, a reciprocating drill shaft having a double cone-
shaped head, and a sliding pawl mounted on the carriage and adapted to be
alternately engaged by the head of the drill shaft, substantially as described.
4. In a drill, the combination with a frame ant a carriage fitted to slide thereon,
of a ratchet nut mounted in the carriage, a feed screw mounted in the frame and
working in the ratchet nut, a reciprocating drill shaft having a double e med head,
and a spring pressed and sliding pawl mounted on the carriage and provided with
two arms alternately engaged by the head of the drill shaft, substantially as
described.
5. In a drill, the combination with a frame and a carriage mounted thereon, of a
drill shaft mounted in the carriage and having a double cone shaped head, a sliding
frame secured to the drill shafi, cams on the driving shaft for engaging the said
sliding frame, a worm on the driving shaft, a worm wheel in which the drill shaft
slides, a ratchet wheel on the drill shaft, and a sliding pawl engaging the ratchet
wheel and operated by the head of the drill shaft, substantially as describe 1.

page_text: 6. The combination with a drill, of a tripod, comprising a double leg and a single
leg, the single leg being secured to the drill frame and vertically adjustable in the
middle portion of the double leg, substantially as described.
Dated this 27th day of August 1895.
A. M. & WM. CLARK,
53 Chancery Lane, London, Chartered Patent Agents.