Improvements in or relating to Rock-drilling and analogous Machines.
Year: 1894

page_text: Date of Application, 26th Apr., 1894-ccepted, 15th Sept., 1894
د
NO A001
Improvements in or relating to Rock-drilling and analogous
Machines.
A communication from LOUIS THOMAS, of Montegnee, near Liege, Kingdom of
Belgium, Mechanical Engineer.
I, Alfred JULIUS BOULT 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:-
This invention relates to improvements in boring machines worked by hand and
particularly to a mode of passing the screw spindle through the boring spindle
itself and a special mode of constructing the driving-nut and ratchet device.
In order to show clearly the essential feature of this invention my correspondent
has represented by way of example, various arrangements of the same, whereof
the following is a description.
Figures 1 to 4 inclusive show in elevation and section a driving nut B lodged in
a case or body A so as to rotate therein. The form of the said case is such that
the nut B is prevented from moving longitudinally in the direction of the axis.
The friction between the driving-nut and the case may be minimised by ball-
bearings, as shown in Figures 2 and 3. In a recess in the wall of the case A is
lodged a pressure plate D which can be pressed upon the nut B to any degree
required, by means of a thumb-screw F, so that the said nut may be either partially
or wholly operative.
Figures 2 and 4 illustrate the arrangement of the case for insertion in a boring-
frame and Figure 5 a similar arrangement with two ratchet-devices.
In Figure 4 two kinds of boring spindle are illustrated, one with a flat and the
other with a sharp screw-thread, either of which may be employed.
Figures 6 to 9 inclusive show the same arrangement applied to a boring frame
abutting against a wooden balk.
The driving nut B is prevented from longitudinal movement in the tubular
case A by two rings C C'; and there are two openings in the tubular case A for
the application of two pressure-plates D and DI which, by means of the caps or
plates E E are retained in such position that the turning of the thumb-screw F
presses them more or less against the nut B. The plates E E¹ are secured by the
Screws S; the thumb-screw F turns in the nut G, connected to H at the opposite
side of the case A so that the pressure from above is repeated from below.
In Figures 10 to 14 inclusive is illustrated the appropriate and specially adapted
mechanism which in combination with the driving nut B is intended to operate the
ratchet-device.
Figure 10 is a side view of the ratchet device. This new construction of
turning-lever consists of a jaw L with hinges K and K', a jaw M pivoting on the
hinge joint K, a handle N and hook P, helical spring T and pin R, which latter
goes completely through the handle N transversely as shown in Figures 13 and 14.
The pin R is screwed at the top and fitted with a nut, which latter presses a
clamp U against the jaw L. At its left end as on the drawings this clamp is forked
as at O and partly encircles the handle N so that the forward end may be
rectilinear and adapted to snap into the slot X between the two hinges so soon as
the jaws L and M are opened, the said jaws being thus kept, when necessary in the
open position shown in dotted lines in Figure 14.
Figures 15 to 18 inclusive, illustrate, in contrast with the foregoing a somewhat
different form of the driving nut B and its case or body A, in so far as the brake

page_text: device is of another kind. The nut B carries at its left end as on the drawing, a
ring C of larger diameter, and is prevented from displacement in the direction of
the axis by the ring C which is secured by the screws S. The brake-action is
brought about by a ring formed of two half cylinders D D' hinged together with
tapped eyes in lugs at their ends and a thumb-screw F whereby they are tightened
or relaxed. The brake-ring becomes firmly attached to the case or body A by
the engagement of the clips E' in the grooves E" of the case. As in the other
case, so in this, the brake action ensues on the application of pressure to the
surface of the cylindrical case or body of the driving nut B.
.In Figures 19 to 23 inclusive another modification is shown which varies from
both the foregoing inasmuch as the brake-action ensues on friction applied to the
front of the driving nut B. F¹ is a screw and nut applied to a ring D" lodged in
the case A. This ring is provided with a feather d sliding in a correspondingly
groove so as to prevent the ring rotating round the axis. The nut F' is turned by
the wrench F. The arrangement of the case A and driving nut B shown in
Figures 24 to 26 inclusive is substantially the same as before described the only
practical difference being that the thumb-screw is replaced by the screw and
wrench F Fu
The advance of the boring tool and spindle results from the general arrangement
and combination of the parts, in the following manner :-
The turning-lever or ratchet device is applied to the boring spindle directly, so
that its jaws grip the screw-thread thereof."
The place to which the application is to be made, may be varied, as shown in
Figures 27 to 29 inclusive, where the ratchet-device grips a driving sleeve which it
turns, thereby causing the boring spindle to rotate.
This apparatus consists of two half-cylinders D which on the one side are
joined together by a hinge G and on the other by a screw F11 after the manner of
a sleeve made in two parts.
In Figure 28 the inner surface is shown as being made octagonal, a form which
corresponds to that of the periphery of the boring spindle; in Figure 29 on the
other hand one of the half-cylinders is fitted with a feather which travels in a
longitudinal groove cut in the boring spindle.
It only remains now to explain in what manner the turning lever or ratchet
device is attached to the last above described apparatus or to the boring spindle.
The jaw L is drawn in the direction of the clump U thereby causing an outward
movement of the movable through-pin R in the boring in the handle N, at the
same time contracting the spring T. Thus the jaw M is liberated from the hook P,
so that both jaws L and M are free to clasp the driving or feed sleeve or the
boring spindle.
Having now.
particularly described and ascertained the nature of the said
invention as communicated to me by my foreign correspondent, and in what
manner the same is to be performed, I declare that what I claim is
1. In hand boring machines such as described to drive or feed the boring spindle
the application to said spindle of a feed-nut such as B lodged so as to rotate in a
case or body A in such manner that its rotation can be partially or wholly prevented
while the rotation of the boring spindle is effected by a turning lever or ratchet
device substantially as described and illustrated in the accompanying drawings.
2. The combination of the feed-nut B as described in Claim 1 and the brake-
device illustrated in Figures 1, 2, 3 and 4 characterised by a plate D lodged in a
recess in the case or body A and by means of a thumb-screw F¹ pressed against
the cylindrical wall or shell of the rotatable feed-nut B substantially as described
and illustrated in the accompanying drawings.
3. In combination with the boring-spindle feed-nut B described in Claim 1 the
brake-device illustrated in Figures 6, 7, 8 and 9 characterized by pressure-plates
such as D and D' in openings in a tubular case or body A and held in such manner by
clamps E and E' that by the action of a thumb-screw the said plates are caused to

page_text: press against the cylindrical surface of the feed-nut B, substantially as described
and illustrated in the accompanying drawings.
4. In combination with the boring-spindle feed-nut B described in Claim 1 the
brake-device illustrated in Figures 15, 16, 17 18 characterised by a ring formed of
two parts such as D D' hinged together encircling a ring C secured tightly on the
feed-nut B in such manner that the latter can be either partially or wholly
prevented from rotating by the action of a thumb-screw while the brake-ring
itself is secured on the case or body A of the feed-nut B by the clips E' E
engaging in recesses E" E" therein substantially as described and illustrated in
the accompanying drawings.
5. In combination with the boring-spindle feed-nut B described in Claim I the
brake-device illustrated in Figures 19, 20, 21, 22 and 23 characterized by a ring D"
prevented from rotating on the axis by a feather d and pressed against the front
surface of the feed-nut by the action of a nut F" whereby the said feed-nut B can
be either partially or wholly prevented from rotating on its axis substantially as
described and illustrated in the accompanying drawings.
6. In hand-boring machines with brake-arrangements and a boring-spindle feed-
nut such as described in Claims 1, 2, 3, 4 and 5 the application and use of a turning
lever or ratchet device for rotating the boring-spindle such as is illustrated in the
Figures 11, 12, 13 and 14, characterised by a jaw such as L connected at one end
by the joint K' with the handle N and at the other end also linkwise with a second
jaw M in such manner that when the lever is turned forwards the jaw L presses
against a bearing hook P but on the lever being turned backwards loosely on the
contrary the jaws are relaxed by the jaw L pressing against the spring-controlled
clamp U substantially as described and illustrated in the accompanying drawings.
7. In combination with the turning-lever or ratchet-device described in Claim 6
the application and use of a spindle sleeve such as illustrated in Figs. 28 or 29 so
constructed that it is prevented from rotating on its axis either by being constructed
with a polygonal internal surface or by being fitted with a feather sliding in a
longitudinal groove provided in the spindle substantially as described and illustrated
in the accompanying drawings.
Dated this ofth dor of Anril 1801
W. P. THOMPSON & BOULT,
Of London, Nottingham, Liverpool, and Manchester,
Agents for the Applicant.