Improvements relating to Deep Boring Apparatus.
Year: 1899

page_text: Date of Application, 7th Feb., 1899-Accepted, 25th Mar., 1899
COMPLETE SPECIFICATION.
Improvements relating to Deep Boring Apparatus.
I, HEINRICH LAPP, of 11, Lindenstrasse, Aschersleben, in the Empire of Ger-
many, 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 deep boring apparatus in which the boring is effected
by a percussive action of the tool. In boring with percussive drills it is necessary
that the boring rod be caused to be lengthened out according to the penetration of
the bore and to such a degree that the bit or tool may strike the bottom of the
bore with equal force at each stroke. If the rod is too short the stroke is ineffective
while if it is too long it is likewise ineffective and there is a risk of breaking the
rod. The present invention has for its object to permit of the boring rods being
readily lengthened or shortened even while working quickly and at great depths.
The invention consists in providing a frame which is capable of adjustment in
relation to the boring rod supporting lever. such frame being capable of adjust-
ment for the purpose of raising or lowering the extremity of the lever and so
adjusting the stroke of the tool within the bore.
The invention is illustrated in the accompanying drawings in which,
Figure 1 represents an elevation of a boring apparatus made in accordance with
the invention, while,
Figure 2 is a front view corresponding thereto.
In the construction illustrated in the drawing it will be seen that a boring rod G
is secured at i to a boring rod supporting lever H which pivots upon an axle Z
suitably mounted upon an underframe, the rods being balanced by means of balance
weights P at the other extremity of the boring rod supporting lever H. A cylin-
der C is mounted upon a cross head T¹ and is fixed within trunnions or pins e to
supporting pillars X pivoted at Q, each pillar X being connected to a lever R. The
respective extremities of the pillar and lever are braced together by means of tie
rods S', the tie rods S₁ being connected to the lever R at V¹. A piston b is pro-
vided to work within the cylinder C and has its piston rod K connected to a cross
rod T. The cross rod T carries at each extremity equidistant from and parallel
to the piston rod, guide rods S whose upper extremities pass through the fixed
cross head T and have spiral springs F mounted thereupon to resist downward or
forward movement while the opposite extremities of the guide rods are connected
to a rod V suitably connected to the extremity of the boring rod supporting lever H.
A valve cock L is provided upon the cylinder C which is controlled by means of a
link a connected to one of the guide rods S as illustrated and this valve cock seves
to admit and exhaust steam to and from the cylinder. The frame R, X, S¹, is
connected at R¹ to an adjusting screw which is capable of operation by means of a
hand wheel N, such adjusting screw being fixedly anchored to a bracket m.
It will be understood that upon the admission of steam into the cylinder C the
piston rod b and piston rod K together with the guide rods S are carried downward
and forward thereby forcing down the boring rod G in the downward direction Y
a

page_text: as indicated. This action serves to compress the springs F and when the piston reaches
the extremity of the stroke the regulating valve cock L will by that time have been
caused to open to exhaust so that thereby the compression of the springs F may
serve to effect the quick return of the piston, guide and boring rods. Steam may
be admitted through the pipe n for the purpose of effecting the upward return of the
rods should the tool have become gripped or embedded in the rock or substance
through which the boring is being effected.
The boring rod G may be adjusted within the bore while the apparatus is in
operation by the rotation of the hand wheel N in one direction or the other, this
rotation serving to adjust the cylinder C and the extremity of the boring rod sup-
porting lever into any position.
It will be understood that the weight of the boring rods is balanced by the
weights P. The adjusting screw R' therefore only serves the purpose of resisting
the thrust of the springs on compression in the downward forward movement of
the rods while its adjustment as before explained permits of the adjustment of the
stroke of the boring rod within the bore.
It is obvious that steam may be provided to positively effect the forward or down-
ward as well as the return or upward stroke of the rods.
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 boring apparatus as herein before described means for effecting the adjust-
ment of the boring rod supporting lever and boring rods consisting of a frame
capable of adjustment for the purpose and substantially as described.
2. A deep boring apparatus substantially as herein before described.
Dated this th day or repruary
1099.
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25, Cross Street, Manchester, Agents: