Year: 1895

page_text: Date of Application, 16th Dec., 1895-Accepted, 29th Feb., 1996
PP
1, HEINRICH LAPP, of Aschersleben, in the Empire of Germany, 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 :-
My invention relates to deep-boring apparatus and has for its object to provide
a mechanism for partially balancing the weight of the drill bars, especially in the
case of diamond drills. It is very important that the pressure upon the drill, which
is produced by the weight of the bars shall be uniform and adapted to be easily
regulated, as with too great a pressure the drill and the bars are liable to break
whilst with too small a weight the work does not proceed with sufficient rapidity.
Moreover the mechanism must be arranged for enabling it to be easily thrown out
of gear, in order that the boring bars, for instance when they have been pulled out,
may be easily lowered to the desired depth.
In accompanying drawing I have shown the improved mechanism constructed
according to my said invention.-
Figure 1 represents a vertical section.
Figure 2 a plan, and
Figure 3 a partial section on the line 1-2 of Fig. 2.
The boring bars are suspended from the rope or chain S wound upon the drum T.
Counter-weights G rest upon a lever H which is connected with the drum T so
that the weight of the bars may be balanced to the desired degree. The lever H
is connected with the drum T by means of a ratchet device in the following
manner.
Upon the shaft W of the drum T is keyed the ratchet wheel a upon whose
prolonged naves a' and a the worm wheel d and the supports q and q' of the
lever H are adapted to turn. The aforesaid lever H supports a worm e. To
the worm wheel d is fixed the pawl 6 which couples the ratchet wheel a with the
worm wheel d and may be held in a certain position by a spring c.
The worm e
can be turned by means of a pair of bevel wheels ff and hand levers g. Two
fixed stops p and p¹ limit the movement of the lever H.
In the lowering of the boring bars the drum T turns in the direction of the
arrow; the ratchet wheel a participates in this movement, and, when the pawl b
is engaged also the worm e and the lever H. Thus the latter moves upwards until
it strikes against the stop p, so that the bars cannot sink any further. If now the
worm e is turned by means of the hand levers, causing the worm wheel turns in
the direction of the arrow the pawl will be disengaged and the lever will move
downwards again, so that the boring bars may be further lowered.
If now the worm e is turned so often that the lever H will always be in suspension
between the two stops p and p¹ and if the counter-weight upon the lever H is such
that the weight of the bars is only partly balanced, a uniform pressure will be
exerted upon the drill.
The more rapidly the drill sinks the more rapidly the lever will move upwards,
and the oftener it will be necessary to turn the worm e.
In case it is desired to throw the mechanism out of gear the drum T is turned
backwards by hand, then the lever H sinks and bears upon the stop pl, and in
the further turning movement the pawl is disengaged from the teeth of the
ratchet wheel a and held in this position by the spring e so that the drum can now

page_text: проп
move without being acted upon by the lever H. On the pawl being caused to
re-engage with the ratchet wheel the lever will follow the movement of the drum
again.
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 deep-boring apparatus mechanism for lowering the boring bars and
balancing the weight of the same, comprising a drum T, to which the boring bars
are fixed by means of a rope or chain, the said drum being coupled with a weighted
lever H provided upon the axis of the said drum by a ratchet device a b, and
adapted to be adjusted by a worm gear e d substantially as set forth.
Dated this 23rd day of November 1895.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.