Improvements in Rotary Rock Drills.
Year: 1896

page_text: Date of Application, 22nd June, 1896-Accepted, 3rd Oct., 1896
Italy, Civil Engineer.]
Improvements in Rotary Rock Drills.
1, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for
Foreign Patent Solicitors, 322, High Holborn, in the County of Middlesex
6, Lord Street, Liverpool, and 6, Bank Street Manchester, both. in the
County of Lancaster, and Lower Temple Street, Birmingham in the County
of Warwick, Civil 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 present invention has for its object an apparatus designed to fix rock drills
both those having the motion of the tool by hydraulic power and those with the
motion by means of a screw.
In the annexed drawing:-
Figure 1 represents in section the lower portion of the drill with the mechanism
which conveys rotary motion to the tool and which serves to attach it to the rock
to be bored.
Figure 2 is a view from below of the plate D D.
Figure 3 is a horizontal section on the line Z Z Figure 1.
Figure 4 is a section on the line Y Y below the upper plate C C.
Figure 5 is a horizontal section on the line B-B Figure 1 and
Figure 6 is a horizontal section on the line X-X Figure 1.
Figure 7 represents the horizontal plan of the cylindrical sleeve with lugs f for
insertion of the crown H H.
Figures 8 and 9 are respectively. the vertical and horizontal section of a
modification of the apparatus.
Referring to Figure 1 it is obvious that A A is the cylinder of the drill, B B is
the shaft of the borer which can be lengthened by means of the pieces m m screwing
one upon the other and the lower of which is the piercing tool of steel or provided
with diamonds according to the character of the rock. The shaft B B is endowed
with a longitudinal advancing movement which can be communicated to it by means
of an hydraulic press or by means of a screw and has at the same time a'rotary
motion which is imparted to it by means of the pairs of cylindrical wheels H K.
The gearing is enclosed in a frame or armature formed of two plates CC DD
united by means of four bolts a a a a which serve to fix their distance apart.
The
spur wheel H is keyed by means of a slot and key upon the axis o o; to the upper
part of this axis a handle is affixed or a pulley may be secured to it for the
transmission of motion of a motor of any kind, preferably working by steam or
electricity. The toothed wheel K bears upon its hub a fixed key which engages
in a longitudinal slot b of B in such a manner that the wheel K carries B round in
its rotary motion without interfering with the motion of advancement. The same
motion by means of cylindrical gear wheels is employed for the slow rotation by
hand and for rapid rotation of the diamond drill. If it be desired to impart a slow
movement to the tool by aid of a motor of rapid rotation the wheels H K'are
replaced by a helicoidal wheel coupled with a worm; such an arrangement is

page_text: represented in its details by Figures 8 and 9. The reference letters correspond to
those of the other figures. K is the helicoidal wheel, H the worm which engages
therein; the axis of the worm is supported in supports M M by means of.screws a a.
T is the point of attachment of the turning handle which can be actuated by a motor
of any kind. The apparatus which serves to fix the boring machine to the rock is
composed of the cylindrical sleeve Fin which is arranged the bronze collar or
cramp t which in its turn receives in its interior the tool bearer m m, that is to say
the shaft of the perforator. As shown in the drawing this shaft has at the top
three lugs fff into which is inserted the annular crown h of the plate D D which
is fixed to the said lugs by means of three studs or catches c' attached to the plate
by means of little chains y. Upon its exterior surface the sleeve F (Figures 5
and 7) has three grooves in the form of inclined planes 2, 2, 2, into which are
inserted the keys 1, 1, 1, (Figure 6) which fix the sleeve and the whole perforating
apparatus to the rock P P. For this purpose the workman commences by making
by any usual means the hole in the rock of suitable dimensious and of limited
depth (V Figure 1).
In Figure 5 is shown a horizontal section of the sleeve and the annular crown,
this crown is provided with openings corresponding to the keys 1, 1, 1.
These
openings are indicated in Figure 2 by the numbers 3, 3, 3. This method of
. attachment is characteristic for its simplicity and for the easy placing and mounting
as also for the firmness of attachment which is obtained. This firm attachment is
based essentially on the difference between the co-efficient of friction between the
rock and the metal and that between metal and metal. The solidity of the
attachment is proportional to the pressure exercised by the tool. The perforating
mechanism can by this means be fixed in any direction and the props or other
supports now in use can be done away with.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :-
1. An apparatus for supporting and fixing rotary drills or boring machines
characterised by having two plates C C D D fixed by means of bolts a a a a, the
said plates serving to support the shaft oo and having between them a spur wheel K
and a pinion H the former keyed upon the shaft of the perforator B and the latter
upen the shaft oo; the upper plate C C being connected to the cylinder A. A of
the borer and the lower plate D D bearing an annular crown h h which can
penetrate in the slots of the lugs fff all substantially as described and illustrated
in the drawings.
2. In apparatus such as set forth in Claim 1, the iron bar B called the perforator
shaft which can be lengthened by means of a number of pieces fixed the one to the
other by means of a screw and of which the lowest one is the boring tool with screw
or diamonds, substantially as above described.
3. In apparatus as set forth in Claim 1 a sleeve F provided with inclined grooves,
with lugs fff in the groove of which enters an annular crown h forming part of
the lower plate D D and which crown is held in place by means of the pieces c¹
suspended by little chains y substantially as described.
4. In the sleeve as set forth in Claim 3 the bronze collar serving as a cramp in
the interior of which slides and revolves the shaft of the perforator provided at its
lower end with cutting tool or with a crown of diamonds substantially as above
described.
5. In apparatus as set forth iu Claim I the arrangement of the inclined
grooves 2, 2, 2, of the sleeve F and of the keys 1, 1, 1, and chain y and pieces c
which latter serve to fix the annular crown to the lugs fff of the sleeve F
substantially as described.
6. In apparatus as set forth in Claim 1
a) The use of couples of helicoidal rearing instead of snur wheel gearing :

page_text: (b) The use of motors of any kind actuated by steam or electricity for the
purpose of imparting motion to the shaft o o all substantially as hereinbefore
described and as shown in the annexed drawings.
Dated this 22nd day of June 1896
W. P. THOMPSON & Co.,
Patent Agents for the Applicant.