Improvements in or relating to Deep Boring Apparatus.
Year: 1899

page_text: Date of Application, 10th Aug., 1899-Accepted. 10th Aug., 1900
Improvements in or relating to Deep Boring Apparatus.
A communication from FRANCOIS GUYNOT DE BOISMENU, of 28, Rue de la Pompe,
Paris, Passy, in the Republic of France.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, in the County of London,
Chartered Patent Agent, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to apparatus for deep boring, its primary object being
the provision of means whereby the excavated material may be removed without
interrupting the operation of the boring or other excavating tool.
Hitherto it has been usual in boring and similar operations either to withdraw
the boring tool at frequent intervals and to insert a separate "clearing tool" to
remove the material broken up or excavated by the boring tool, or, in cases where
the "clearing tool" forms part of the boring tool, to raise the tool for the purpose
of bringing the excavated material to the surface. In either case the boring
operation has to be stopped, while the excavated material is got rid of, and conse-
quently a considerable loss of time ensues.
In boring apparatus according to this invention this disadvantage is obviated
by the employment of a "clearing tool" which can be operated without stopping
the working of the boring tool.
The "clearing tool" is preferably so constructed that it co-operates with the
boring tool, striking or beating with it and smoothing the hole, and is then raised
and the excavated material removed while the boring tool continues in operation.
The "clearing tool" conveniently consists of a tubular body having a crown
or nose-piece tapering down to a cutting edge. An internal tube is provided
through which the rods of the boring tool pass, and the space between this inner
tube and the outer tube forms a pocket "into which the excavated material
passes. Preferably an opening is formed in the outer tube closed by a door or
valve when the clearing tool is lowered, and opened when the tool is raised to
allow the removal of the material.
In the accompanying drawings
Figure 1 is an elevation of a boring tool and a "clearing tool" according to
one construction of this invention,
Figure 2 is a longitudinal central section of the same,
Figure 3 is an elevation partly in section and taken at right angles to Figures 1
and 2 showing the "clearing tool" raised independently of the boring tool, and
Figures 4 and 5 are transverse sections on the lines 4-4 and 5-5 of Figures 2
and 3, respectively.
Like letters indicate like parts throughout the drawings.
The boring tool consists of a head A carried by screw pointed rods B and pro-
vided with cutting edges as at A'. It is suspended by a rope C. The " clearing
tool "comprises a tubular body D and an annular crown E connected to the body D
as at D. Just above the crown E an inner tube F is fitted the annular space G

page_text: between the inner tube F and the body D forming a "pocket" into which the
excavated material passes. Eyes or rings H are fixed to the upper portion of the
body D and through them pass ropes J by means of which the "clearing tool" is
suspended independently of the boring tool. Openings D2 and D³ are formed in
the body D, the opening D³ being situated just above the crown E and provided
with a door D which slides in guides D5 and is operated by a handle D6. The
door D is raised as shown in Figure 3 when the clearing tool" is withdrawn,
in order that the material in the pocket G may pass out through the opening D³.
It is to be noticed that when the "clearing tool" is in its lowest position the
interior of the crown E, which is conical in shape, rests upon the boring tool as
at E', the sharp cutting edge of the crown E projecting downwards as shown in
Figure 2. Normally the boring tool and the "clearing tool" co-operate in this
position, striking and beating together, the cutting edge of the crown E smooth-
ing and finishing the sides of the excavated shaft. When it is estimated that the
pocket G is filled the "clearing tool" is raised as shown in Figure 3 while the
boring tool continues working uninterruptedly.
It will be apparent that the boring apparatus according to this invention renders
continuous boring possible whatever may be the nature of the soil, and further
as the excavated material is collected by the "clearing tool" practically as soon as
it is formed the boring tool can attack a fresh surface at the bottom of the hole
at each stroke and is not impeded by a mass of loose material, consequently the
height to which the boring tool is raised for its stroke may be diminished. Again,
the clean condition of the hole facilitates the turning of the boring tool at what-
ever depth it is working, even if it is merely suspended by ropes. The improved.
apparatus makes boring by means of ropes practicable at considerable depths,
where by the old method it was necessary to employ rods and thus a considerable
saving of time is effected.
Various modifications may be made in the above described apparatus without
departing from the spirit of this invention, for instance, the boring tool may be
of any convenient shape and the details of construction of the "clearing tool"
may be varied to suit the particular form of boring tool employed.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent and in what manner
the same is to be performed, I declare that what I claim is
1. The combination with a boring tool of a clearing tool" which normally
cooperates with the boring tool but can be raised or lowered independently of it
substantially as described.
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2. In deep boring the employment of a "clearing tool" which can be operated
for the purpose described without stopping the working of the boring tool.
3. The combination with a boring tool of a clearing tool" having a cylindrical
body with an internal "pocket" for the excavated material and a cutting crown
substantially as described.
4. The complete boring apparatus substantially as described or illustrated in
the accompanying drawings.
Dated thin 10th day of Anaust 1900