Improvements in Hand-operated Rock Drills, Ratchet-braces, and the like.
Year: 1896

page_text: Date of Application, 22nd Aug., 1898-Accepted, 17th Oct., 1896
COMPLETE SPECIFICATION.
Improvements in Hand-operated Rock Drills, Ratchet-braces,
and the like.
I, MATHIEU LIESENS, of Tamines, in the Kingdom of Belgium, Miuing-
Engineer, 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 this invention is a device, by the use of which the handling of
rock-drills and other boring implements, especially fitter's ratchet-drills, is much.
simplified, and the passive resistances are more easily mastered.
The improved device is adapted to be fitted to existing boring-tools.
The device is shown on the accompanying drawing, in which
Figure 1 is a longitudinal section, partly in elevation, taken on the line G-H of
Figure 4;
Figure 2 is a section on the line E-F of Figure 1;
Figure 3 is a front view of the end receiving the drill, and
Figure 4 is a section on the line A-B of Figure 1.
The box carrying the ratchet-brace, and connecting the drill to the advancing
screw is here made of two pieces (a) and (b). The first of those receives the drill
by means of the socket (h), and (b) receives the advancing screw. The part (a)
is fitted into the part (b), and these two parts are provided with flanges (c) and (d).
having anti-friction balls set between them, in order to avoid the use of lubricants,
and prevent the screw from being carried along by the motion of the drill. The
ratchet-brace (g) is equally made in two pieces, bolted together so as to surround
the flanges (c) and (d). This ratchet-brace carries two pawls K, one on each side,.
but the ratchet-wheels (!) and (m), which receive their circular motion by means
of these pawls are not alike. The wheel () which works the drill, has its teeth set
much closer than the wheel (m), which works the advancing screw. The consequence
of this arrangement is, that if the workman gives the ratchet-brace only a small
stroke, which he naturally does when the tool meets a hard substance, the wheel ().
will alone turn, and the drill will turn, without the screw participating in the
rotating motion. If however the workman gives the tool a greater swing, which
he will naturally do when there is less resistance, one or more teeth of the wheel (m).
will be carried along in the rotary motion, taking along with them the piece (6)
and the screw, which will turn in the fixed nut, which serves for a bearing. The
drill will then receive a rotary and an advancing motion at the same time.
This device is applicable to all kinds of tools, which receives a rotary and an.
advancing motion, but especially to engine-fitter's ratchet-drills.
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. In rock-drills, and other boring-tools, worked by hand and receiving a rotary
and an advancing motion, a ratchet-brace having two pawls, one of them gearing
with a wheel attached to the end carrying the drill, this first wheel having its teeth
close to each other; and the other pawl gearing with another wheel, fixed to the
eud carrying the advancing screw, this second wheel having its teeth wider apart,
the drill and the screw being able to turn independently of each other as usual,
substantially as specified and shown in the drawing.

page_text: 2. In boring tools, a ratchet-brace made in two pieces with anti-friction balls
placed between the part carrying the drill and the part carrying the advancing
screw, to avoid the use of lubricating substances, and to prevent the carrying along
of the screw by the rotary motion of the drill.
Dated this 22nd day of August 1806.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.