Improved Percussive Drill Mechanism, also applicable generally for Imparting a Combined Reciprocating and Rotary Motion to a Rod.
Year: 1892

page_text: Date of Application, 18th Aug., 1892
Complete Specification Left, 11th May, 1893--Accepted, 17th June, 1893
PROVISIONAL SPECIFICATION.
Improved Percussive Drill Mechanism, also applicable generally for
Imparting a Combined Reciprocating and Rotary Motion to a Rod.
I, JULIEN DULAIT, of Charleroi, Belgium, Engineer, do hereby declare the
nature of this invention to be as follows:-
:-
This invention relates to an improved percussive drill mechanism for drilling
rocks and other materials the construction and action of which will be understood
on reference to the accompanying drawings in which
Fig. 1 shews an elevation and Fig. 2 a plan of the drill.
A
The apparatus consists mainly of a metal framing cle²ec, the transverse
pieces of which form the bearings for the rod M to which is fixed a disc p.
helical or other spring presses the rod M in the direction of the arrow x y
Fig. 1. A spiral or volute cam a formed in one with a pulley / Fig. 2, being turned
thereby in the direction of the arrow a ẞ, is made to bear with frictional contact
against the disc p and to force the rod M back against the action of the spring.
When the point r of the cam a, in rotating, releases the disc p, this being urged
forward by the compressed spring causes the rod M to be thrown forward again, so
as to cause the drill secured in the socket thereof, to operate with percussive
action on the rock or other material to be perforated. At the same time a rotary
motion of the rod M and its drill is also obtained by the rolling action of the
surface rr upon the disc p whereby the latter is rotated and carries the rod
and drill round with it. The rotation of the rod M and drill consequently take
place during the backward motion thereof. The cam is rotated by a belt passing
round its pulley and round a smaller pulley on the armature axis of an electro
motor E.
This is carried on the framing firstly by the cross piece g which can slide on the
framing c¹ c² 3 c, and secondly by the screw spindle and nut & which bears against
the cross piece ². By rotating the nut u in one direction it causes the motor
to be drawn towards it, and thus stretches the belt W to the required degree
for driving the pulley 1.
The framing is supported by legs G through the boss of which screws a screw
spindle H rotated by a crank handle and carried at its other end by a socket
on the cross piece t¹. The cross pieces t¹ t' also carry a rod J which is also
connected by a socket to the screw spindle H, so that by the rotation of the
latter the rod J and with it the framing carrying the drill can be advanced as
the drilling proceeds.
The above described mechanism for imparting a combined reciprocating and
rotary motion to a rod may also be applied for other purposes than percussive
drills.
Dated this 18th day of August. 1892.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improved Percussive Drill Mechanism, also applicable generally for
Imparting a Combined Reciprocating and Rotary Motion to a Rod.
1, JULIEN DULAIT, of Charleroi, Belgium, 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 :--
This invention relates to an improved percussive drill mechanism for drilling
Pain Q1

page_text: rocks and other materials the construction and action of which will be understood
on reference to the drawings accompanying my Provisional Specification in which
Fig. 1 shews an elevation and Fig. 2 a plan of the drill.
A
The apparatus consists mainly of a metal framing c³ ³ ³ c, the transverse
pieces of which form the bearings for the rod M to which is fixed a disc p.
helical or other spring presses the rod M in the direction of the arrow x y Fig. 1.
A spiral or volute can a formed in one with a pulley Fig. 2, being turned
thereby in the direction of the arrow a ß, is made to bear with frictional contact
against the disc p and to force the rod M back against the action of the spring.
When the point r of the cam a, in rotating, releases the disc p, this, being urged
forward by the compressed spring, causes the rod M to be thrown forward again,
so as to cause the drill secured in the socket n thereof, to operate with percussive
action on the rock or other material to be perforated. At the same time a rotary
motion of the rod M and its drill is also obtained by the rolling action of the
surface upon the disc p whereby the latter is rotated and carries the rod
and drill round with it. The rotation of the rod M and drill consequently take
place during the backward motion thereof. The cam is rotated by a belt passing
round its pulley 7 and round a smaller pulley on the armature axis of an electro
motor E. This is carried on the framing firstly by the cross piece g which can
slide on the framing c² c³ ³, and secondly by the screw spindle and nut u which
bears against the cross piece ces. By rotating the nut u in one direction it causes
the motor to be drawn towards it, and thus stretches the belt W to the required
degree for driving the pulley . The framing is supported by legs G through the
boss of which screws a screw spindle H, rotated by a crank handle and carried at
its other end by a socket on the cross piece t¹. The cross pieces t¹t also carry a
rod J which is also connected by a socket to the screw spindle H, so that by the
rotation of the latter the rod J and with it the framing carrying the drill can be
advanced as the drilling proceeds.
The above described mechanism for imparting a combined reciprocating and
rotary motion to a rod may also be applied for other purposes than percussive
drills.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The herein described mechanism for imparting a combined reciprocating and
rotary motion to a rod or bar, such mechanism being more particularly applicable
to the working of a percussive drill.
Dated this 0th dow of Nov 1902
ABEL & IMRAY,
Agents for the Applicant.