Improvements in and relating to Deep Boring Apparatus.
Year: 1898

page_text: Improvements in and relating to Deep Boring Apparatus.
I, FRANCIS HARLEY DAVIS, of 29. Finks Buildings, Elizabeth Street, Mel-
bourne, in the Colony of Victoria, Engineer, do hereby declare the nature of this
invention to be as follows:-
or shaft sinking and
My invention relates to boring apparatus for well
similar services, and has for its object to provide means for conveniently effect-
ing the rotation of the boring rods or tubes employed and the ready connection
or disconnection of the constituent rods or tubes: and to provide means for
sustaining the weight of the inserted rods or tubes, non introduction or upon
disconnection of the integral parts when withdrawing the rod.
removal or repair of the cutting bit or tool or for withdrawal of the core.
or tubes for
My invention is applicable generally to boring apparatus for well or shaft
sinking and similar services, and is especially designed for use in connection
with the well known Davis-Calyx drill, or with the boring apparatus described
in the Specification to Letters Patent granted to me No. 889 dated 14th January
1895.
My invention comprises means for conveniently effecting the rotation of the
boring rods or tubes emploved consisting of a fixed axle firmly bolted or other-
wise secured to a suitable foundation in position where the bore is to be made,
such axle carrying upon its exterior a spur or bevel wheel to which motion is
communicated from a spur or bevel pinion suitably mounted in relation thereto.
This spur or bevel wheel is provided with an inwardly projecting flange plate
or arms suitably divided and preferably provided in semicircular segments
hinged to the spur or bevel wheel, such segmental plates being centrally pro-
vided with a square or other conveniently shaped hole through which the boring
rods or tubes may pass: so as to be rotated by means of the spur or bevel wheel.
the segmental flange plate being provided and secured as to effectively transmit
the driving power to the rods or tubes.
My invention further comprises means for sustaining the weight of the in-
serted rods or tubes upon introduction or upon disconnection of the integral parts
of the rods or tubes, consisting of snaps or gripping jaws which are preferably
provided with interior corrugated or fluted surfaces to correspond with the
exterior corrugated or fluted surface of the neck of the coupling pieces that con-
nect the sections or series of the tubes or rods together, such jaws being mounted
within the fixed axle previously referred to and being preferably of two in
number oppositely disposed and pivotting respectively upon spindles or bolts
suitably provided and so disposed when in their position supporting a length of
the boring tube or rod that the one jaw may abut against the other and the twɔ

page_text: embrace the corrugated or fluted part of a coupling piece of the centrally passing
boring rod or tube, and each preferably be so disposed or inclined that their
respective supporting spindles or bolts may in a measure take the weight
of the rods, or tubes, SO
that thereby the abutting jaws may
not
wholly act as a beam to sustain the weight of the rods or tubes. The gripping
jaws owing to the corrugations or flutes provided serve the purpose of precluding
the rotary motion of the rods, and may be put into operation by means of a foot
lever acting upon a spindle upon which a double armed lever is also provided,
the respective arms being connected to levers provided upon the spindles carry-
ing the jaws, so that upon the depression of the foot lever the jaws are caused
to pass upwardly and outwardly in opposite directions thereby assuming a vertical
position so an to permit of casing tubes being inserted when necessary.
My invention further comprises features hereinafter described as applied.
In carrying my invention into effect I provide a fixed axle having an interior
bore corresponding to the diameter of the casing tube that it is intended to
employ when such is necessary or of any convenient diameter, and such axle I
fix upon a suitable foundation in position where it is required to bore, and
upon an upper or laterally and outwardly projecting flange formed thereupon I
provide a rotating plate upon the underface of which is suitably secured a bevel
or spur wheel, which engages with a bevel or spur pinion mounted upon a
shaft deriving motion from any suitable source of motive power.
The rotating
plate may be mounted on ball or roller bearings so that the minimum amount
of friction may be occasioned and a cover plate or flange may be secured upon
the axle for the purpose of maintaining the rotating plate in position. The
rotating plate is provided with an inwardly projecting flange plate suitably
divided and preferably divided in semicircular segments hinged to the rotating
plate so as to rotate therewith such segmental divided flange plate being centrally
provided with a square or other conveniently shaped hole through which the
boring rods or tubes may pass, such rods or tubes being of a shape corresponding
to that of the hole within the divided segmental flange plate which is secured to
the rotating plate so as to effectively transmit the driving power to the rods or
tubes.
Upon the interior of the fixed axle in opposite positions are mounted snaps
or gripping jaws having corrugated or fluted surfaces engaging with correspond-
ing surfaces provided upon the coupling pieces connecting the integral parts
of the rods or tubes together, such gripping jaws being preferably mounted m
vertical recesses, and upon transverse spindles or bolts suitably arranged and
passing to the exterior of the fixed axle, such spindles or bolts being provided
with crank arms or levers connected to the respective extremities of a double
armed lever provided and mounted upon the exterior, upon spindle to which
also a foot lever is applied so that on the depression of the foot lever the gripping
jaws are raised out of contact with the coupling piece which they previously
engaged and are brought to a vertical position within the respective vertical
recesses provided in the axle to receive them so that a clear way is provided for
the introduction of casing tubes when such are necessary to employ.
The boring tubes or rods are connected or disconnected in sets, seris or
lengths of three or other convenient number of integral pieces cach coupled to the
other by means of a coupling piece having a corresponding exterior form to that
of the tube or rod and when the tubes are employed having a corresponding
hole through which the water may be pumped. The coupling pieces that secure
the series or lengths of tubes or rods are provided with a flange and a corrugated
or fluted neck with which engage the gripping jaws or snap so that the depend-
ing length of rod may be held in the bore for the disconnection of a previously
withdrawn series of tubes or rods or for the connection thereto of another series.
On the disconnection of a set, series or length of tubes or rods they are lifted
through the square hole in the flange plate so that the next coupling piece may
rest upon and within the nap or gripping jaws previously brought in position

page_text: and the engine is reversed with the effect of unscrewing from the coupling piece
the sets or series of tubes so withdrawn, so that that series which then depends
from the hook of the derrick or other hoisting gear may be passed away and a
screwed plug may be caused to engage with that coupling piece for the with-
drawal of a further set or series and its disconnection by reversing the engine
as before described.
Instead of employing a rotating plate to communicate the motion to the boring
rods or tubes, I may dispense therewith and employ instead a simple bevel or
spur wheel suitably mounted and carried upon the fixed axle, and provided with
inwardly projecting arms or flanges which may be hinged so as to permit of the
lower sections of the rods or tubes being withdrawn and having square or other
suitably shaped holes therein that permit of the passage therethrough of the
motion to be communicated.
upper sets of rods or tubes while permitting
Motion may however be communicated to the rotating plate or its equivalent
by any suitable friction or other gear.
I may provide means for maintaining the snap or gripping jaws in the engaged
position such as a spring or other catch, or for the same effect I may arrange
the snap or gripping jaws under the action of a spring or springs while likewise
I may provide that their disengaged position may be determined by a spring or
other catch or by means of springs so as in each case to preclude accidental
operation thereof I may alternately arrange for the snap or gripping jaws to be
operated from one point to the other by means of two foot levers so as to ensure
positive action.
I may form the mouths of the snap or griping jaws square or of such other
form that by corresponding to the neck of the coupling piece will prevent the
rotation of the rods.
Further it is obvious that I may arrange the bevel or spur wheel or its carry-
ing plate as inwardly projecting and preferably having its motion derived from
a pinion mounted within the interior of the axle in such position as to clear the
extreme diameter of the bore, while it is also obvious that the snap or gripping
jaws may be mounted above instead of below the gear upon the fixed axle.
may provide any other suitable means for operating the snap or gripping jaws
without departing from my invention.
It will thus be seen that by means of my invention it is possible to effect the
rotation of the boring tubes or rods in a very convenient manner that permits
of the sections or series of tubes or rods being continuously introduced and fed
without the necessity of the withdrawal or partial withdrawal of any of the
sections or series while the connection is capable of being readily effected and
the disconnection in like manner upon the simple reversal of the engine: the
arrangement of snap or gripping jaws being such as to facilitate the connection
or disconnection of the series or sections of tubes by sustaining those series or
sections remaining in the bore: the whole affording a simple and expeditious
means whereby the operation of boring is effected with increased facility and
economy.
·
1000
Improvements in and relating to Deep Boring Apparatus.
I, FRANCIS HARLEY DAVIS, of 29, Finks Buildings, Elizabeth Street, Mel-
bourne, in the Colony of Victoria, Engineer, do hereby declare the nature of this

page_text: 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 boring apparatus for well or shaft sinking and
similar services, and has for its object to provide means for conveniently effect-
ing the rotation of the boring rods or tubes employed and the ready connection
or disconnection of the constituent rods or tubes; and to provide means for
sustaining the weight of the inserted rods or tubes, upon introduction or upon
disconnection of the integral parts when withdrawing the rods or tubes for
removal or repair of the cutting bit or tool or for withdrawal of the core.
My invention is applicable generally to boring apparatus for well or shaft
sinking and similar services, and is especially designed for use in connection
with the well known Calyx drill, or with the boring apparatus described
in the Specification to Letters Patent granted to me No. 889 dated 14th January
1895.
My invention comprises means for conveniently effecting the rotation of the
boring rods or tubes employed consisting of a fixed axle firmly bolted or other-
wise secured to a suitable foundation in position where the bore is to be made,
such axle carrying upon its exterior a spur or bevel wheel to which motion is
communicated from a spur or bevel pinion suitably mounted in relation thereto.
This spur or bevel wheel is provided with an inwardly projecting flange plate
or arm suitably divided and preferably provided in semicircular segments
hinged to the spur or bevel wheel, such segmental plates being centrally pro-
vided with a square or other conveniently shaped hole through which the boring
rods or tubes may pass; so as to be rotated by means of the spur or bevel wheel,
the segmental flange plate being provided and secured so as to effectively transmit
the driving power to the rods or tubes.
My invention further comprises means for sustaining the weight of the in-
serted rods or tubes upon introduction or upon disconnection of the integral parts
of the rods or tubes, consisting of snaps or gripping jaws which are preferably
provided with interior corrugated or fluted surfaces to correspond with the
exterior corrugated or fluted surface of the neck of the coupling pieces that con-
nect the sections or series of the tubes or rods together, such jaws being mounted
within the fixed axle previously referred to and being preferably of two in
number oppositely disposed and pivotting respectively upon spindles or bolts
suitably provided and so disposed when in their position supporting a length of
the boring tube or rod that the one jew may abut against the other and the two
embrace the corrugated or fluted part of a coupling piece of the centrally passing
boring rod or tule, and each preferably be so disposed or inclined that their
respective supporting spindles or o't, may in a measure take the weight
4.r tuli (0) tha thereby the abutting jaws may
of the
not
wholly act as him to su in the weight of the rods or tubes. The gripping
jaws owing to the corrugations or flutes provided serve the purpose of precluding
the rotary motion of the rods, and may be put into operation by means of a foot
lever acting upon a spindle upon which a double armed lever is also provided,
the respective arms being connected to levers provided upon the spindles carry-
ing the jaws, so that upon the depression of the foot lever the jaws are caused
to pass upwardly and outwardly in opposite directions thereby assuming a vertical
position so as to permit of casing tubes being inserted when necessary.
My invention further comprises features hereinafter described as applied.
In carrying my invention into effect I provide a fixed axle having an interior
bore corresponding to the diameter of the casing tube that it is intended to
mploy when such is necessary or of any convenient diameter, and such axle I
fix upon a suitable foundation in position where it is required to bore, and
apon in upper or laterally and outwardly projecting flange formed thereupon I
provirotating plate upon the underfece of which is suitably secured a bevel 5
or spur wheel, which engages with a bevel or spur pinion mounted upon a

page_text: shaft deriving motion from any suitable source of motive power.
The rotating
plate may be mounted upon ball or roiler bearings so that the minimum amount
of friction may be occasioned and a cover plate or flange may be secured upon
the axle for the purpose of maintaining the rotating plate in position. The
rotating plate is provided with an inwardly projecting flange plate suitably
divided and preferably divided in semicircular segments hinged to the rotating
plate so as to rotate therewith such segmental divided flange plate being centrally
provided with a square or other conveniently shaped hole through which the
boring rods or tubes may pass, such rods or tubes being of a shape corresponding
to that of the hole within the divided segmental flange plate which is secured to
the rotating plate so as to effectively transmit the driving power to the rods or
tubes.
Upon the interior of the fixed axle in opposite positions are mounted snaps
or gripping jaws having corrugated or fluted surfaces engaging with correspond-
ing surfaces provided upon the coupling pieces connecting the integral parts
of the rods or tubes together, such gripping jaws being preferably mounted in
vertical recesses, and upon transverse spindles or bolts suitably arranged and
passing to the exterior of the fixed axle, such spindles or bolts being provided
with crank arms or levers connected to the respective extremities of a double
armed lever provided and mounted upon the exterior, upon a spindle to which
also a foot lever is applied so that on the depression of the foot lever the gripping
jaws are raised out of contact with the coupling piece which they previously
engaged and are brought to a vertical position within the respective vertical
recesses provided in the axle to receive them so that a clear way is provided for
the introduction of casing tubes when such are necessary to employ.
The boring tubes or rods are connected or disconnected in sets series or
lengths of three or other convenient number of integral pieces each coupled to the
other by means of a coupling piece having a corresponding exterior form to that
of the tube or rod and when tubes are employed having a corresponding
hole through which the water may be pumped. The coupling pieces that secure
the series or lengths of tubes or rods are provided with a flange and a corrugated
or fluted neck with which engage the gripping jaws or snap so that the depend-
ing length of rod may be held in the bore for the disconnection of a previously
withdrawn series of tubes or rods or for the connection thereto of another series.
On the disconnection of a set, series or length of tubes or rods they are lifted
through the square hole in the flange plate so that the next coupling piece may
rest upon and within the snap or gripping jaws previously brought in position
and the engine is reversed with the effect of unscrewing from the coupling piece
the sets or series of tubes so withdrawn, so that that series which then depends
from the hook of the derrick or other hoisting gear may be passed away and a
screwed plug may be caused to engage with that coupling piece for the with-
drawal of a further set or series and its disconnection by reversing the engine
as before described.
Instead of employing a rotating plate to communicate the motion to the boring
rods or tubes, I may dispense therewith and employ instead a simple bevel or
spur wheel suitably mounted and carried upon the fixed axle, and provided with
inwardly projecting arms or flanges which may be hinged so as to permit of the
lower sections of the rods or tubes being withdrawn and having square or other
suitably shaped holes therein that permit of the passage therethrough of the
upper sets of rods or tubes while permitting motion to be communicated.
Motion may however be communicated to the rotating plate or its equivalent
by any suitable friction or other gear.
I may provide means for maintaining the snap or gripping jaws in the engaged
position such as a spring or other catch, or for the same effect I may arrange
the snap or gripping jaws under the action of a spring or springs while likewise
I may provide that their disengaged position may be determined by a spring or

page_text: other catch or by means of springs so as in each case to preclude accidental
operation thereof I may alternatively arrange for the snap or gripping jaws to be
operated from one point to the other by means of two foot levers so as to ensure
positive action.
I may form the mouths of the snap or gripping jaws square or of such other
form that by corresponding to the neck of the coupling piece will prevent the
rotation of the rods.
Further it is obvious that I may arrange the bevel or spur wheel or its carry-
ing plate as inwardly projecting and preferably having its motion derived from
a pinion mounted within the interior of the axle in such a position as to clear the
extreme diameter of the bore, while it is also obvious that the snap or gripping
jaws may be mounted above instead of below the gear upon the fixed axle.
may provide any other suitable means for operating the snap or gripping jaws
without departing from my invention.
A boring apparatus made in accordance with the invention is illustrated in
the accompanying drawings in which,
Figure 1 is a view in section and partly in elevation showing the parts in
position for boring.
Figure 2 is a similar view showing the parts in position for connecting or
disconnecting two cylindrical sections of the drill tube.
Figure 3 is a view in plan of the drill operating device.
Figure 4 is a similar view showing the dome removed.
Figure 5 is a plan view of one of the clamping jaws.
Figure is a sectional view of same.
Figure 7 is a view in end elevation of the upper end of one of the coupling
supporting arms.
Figure 8 is a section, and,
Figure 9 a side elevation of the drill actuating device.
Figure 10 is a view in section showing a round and a square drill rod sections
coupled together.
Figure 11 is a similar view showing round sections coupled.
Figure 12 is a view in section through the coupling 0, and,
Figure 13 is a similar view through the coupling N.
A represents the base plate provided with an aperture a slightly larger than
the bore and adapted to permit of the free passage of the casing or tools used.
Rigidly secured to the upper face of the base A, and concentric with the
aperture a are the two segmental guides B, located at diametrically opposite
points and provided at their upper edges with outwardly projecting flanges b
which latter rest in the groove of the dome (and hold the lotter against vertical
and lateral displacement. The dome is preferably shaped as shown and is
supported centrally by the cylindrical bearing D the upper flat face of which
carries an anti-fiction was which latter rests in contact with the lower face
of the dome C. The dome is provided with a depending flange d concentric
with its axis, which brs against the inner edge of the top of cylinder 1) and
assists in preventing any lateral movement of the dome and also prevents grit
or the like from getting into the bearing. The dome is provided on its lower
face with a beveled gear E integral with or secured to said dome, and meshing
with the bevel pinion F, secured on the shaft F, which latter is supported in
the pillow blocks G and is coupled to the driving mechanism of the engine.
The dome is provided centrally within the depending flange d with an opening
or aperture in line with the aperture a in the base A, within which rest the inner
ends of the clamping jaws H. These jaws when closed approximately cover the
aperture or opening in the dome except at the centre where an opening is formed
in the two jaws to receive the d'ill iod. This opening may be of any suitable
shape other than a circle, but I prefer to have it square to receive and engage the
sides of a hollow square drill rod.

page_text: The jaws H are hinged at their rear ends to the brackets e integral with the
dome, the brackets having elongated holes which permit of a longitudinal tra-
versing movement of the jaws, so as to permit them to be adjusted toward and
away from each other.
To prevent the jaws spreading or separating, I have provided adjusting screws I
which latter pass through female threaded openings in the upwardly project-
ing lugs I in the top of the dome and bear against the jaws at the points f. By
means of these screws the jaws can be adjusted to compensate for wear and also
act as a vice or clamp for holding the tools up from the bottom of the bore while
adding another length or rod.
The jaws are provided at their rear ends, each with a tail piece H which acts
as a stop and sustains the jaws in an inclined position slightly beyond their
centres of gravity when the jaws are opened, as is the case when inserting a
casing, core barrel etc.
The dome is further provided on its top, with two diametrically opposite
sockets f adapted to receive removable standards which are used as a means for
rotating a horizontal cross head or other device rigidly clamped to the core barrel
or to the casing as the case may be.
Formed integral with the top of the dome, and at points intermediate the lugs I¹
are the bosses J which form seats for the latches J¹. These bosses are located
between the clamping jaws H which latter are cut away adjacent to the bosses,
and the latches J1 are designed to overlap both jaws and hold them in their
closed positions. The latches are pivoted on screw bolts secured to the bosses
and are held against accidental movement by the spring locks J2 carried by the
latches with their free ends engaging the angular heads of the bolts.
The cylinder D which as before stated is rigid with the base A, is provided at
diametrically opposite points with two openings K within which are mounted
the drill supporting arms L. These arms L are cach secured to a shaft L¹
mounted in bearings on the base a, and when open or separated rest within
the openings K thus permitting the largest size tools to be passed through the
dome and base, and when closed or in a position to support the drill, rest in
inclined positions with their upper ends in contact with each other, or in contact
with the drill rod.
One shaft L' extends beyond the side of the base A and is provided with a
treadle L suitably weighted to normally sustain the arms L in their horizontal
positions, after having been moved to such position by the foot of the operator,
and both shafts carry intermeshing segment gears M which latter operate to
actuate both arms simultaneously. The weight of the arms L is sufficient to
sustain them in their closed position (shown in Figure 2) and when in their closed
position they operate to grasp the drill rod coupling and not only sustain the
drill rod in a suspended position but owing to their construction, also prevent
it from being turned.
The upper ends of these arms L are bent inwardly toward each other so that
when the arms are closed the bent upper ends are horizontal, and the upper ends
are each provided with preferably a semi-circular recess m in its meeting face
(shown in Figure 7) so that when the arms are closed or together, the two
recesses receive the couplings connecting the rod sections. The wall of each
recessed end is also provided with a series of tapered grooves m¹ and correspond-
ing intermediate ribs m³, the grooves being pointed or narrowed at their lower
ends and enlarged at their upper ends and the ribs m³ are correspondingly
pointed at their upper ends and narrowed at their lower ends.
Two couplings N and 0 are secured together by male and female threads, and
these two couplings connect adjacent sertions P of the drill tube. The lower
coupling N conforms in contour externally with the recesses m in the arms L,
while the coupling 0 is angular externally to conform to the contour of the space
between the clamping jaws II. When the lower coupling N is between the

page_text: arms L, the upper coupling O is clamped between the jaws H, and as the lower
coupling N is provided with ribs m5 and grooves me corresponding in size and
shape with the ribs m' and grooves m³ in the arms L it will be seen that the
drill rod will not only be supported or suspended by the arms L but as the
ribs m of the coupling N enter the grooves m¹ in the arms L, and the grooves m
in the coupling N receive the ribs m³ of the arms L it will be seen that the
coupling is securely locked against rotation.
The upper coupling O as before stated corresponds in shape to the shape of the
recesses in the clamping jaws H, and hence it will be seen that if the dome
carrying the jaws be rotated the upper coupling O will be rotated and be either
screwed in or unscrewed from the lower coupling N, hence in the operation of
withdrawing the drill from the bore hole, the sections are drawn up until the
lower coupling N of the upper pair of couplings is in a position to be engaged
by the arms L.
When the drill is down and working, the arms are thrown back into the
recesses K, but when withdrawing the drill, the arms are first thrown over into
contact with the rod and trailing against same are automatically opened by
contact with the coupling, hence by elevating the drill rods until the coupling
is slightly above the arms, and then lowering until the coupling N clutches into
the toothed recess formed in the arms L, the drill rod is held suspended and
clamped by the arms.
By turning the dome in the reverse direction from that in which it moved
while drilling it will be seen that the upper coupling O carrying a section of
drill rod will be unscrewed, thus leaving it free to be moved. By now elevating
the drill rod until the next pair of couplings are reached, the upper section of the
rod with its coupling, is removed in the same manner and so on until all the
boring rods have been withdrawn.
When inserting the drill in the bore hole, the sections of the drill rod are added
by supporting the upper end of the first section of the tube in the arms L, and
placing an additional section on the first section and then rotating the dome in
the direction it is rotated in drilling.
In practice, I prefer to use round hollow drill rods P below the surface and
angular rods P₁ above, and at points near the surface; a section of the angular
rod while drilling, being always between the jaws H, and being angular (or of a
shape other than circular) is engaged directly by the jaws II and is rotated
thereby, the jaws simply applying torsional strain against the angular sides of
the rod, but do not grip them sufficiently to prevent free movement up or down.
The drill used in connection with this apparatus is preferably the Calyx drill
which consists of a bit or cutter R of cylindrical shape secured at its upper end to
a core barrel R¹, and the drill rods P and Pare connected to the core barrel by
a reducing plug P Secured to the reducing plug and extending upwardly
around the drill rod for a suitable distance is a pipe or cup P which receives the
fragments of rock detached by the drill teeth. Water is forced down through
the water swivel P6, and hollow drill rods P, P1 into the core barrel and drill and
passes out into the bore between the teeth of the drill, and rises on the outside of
the core barrel and cup with considerable velocity owing to the limited space
between the tubes and the wall of the bore. After it passes above the top of the
cup or
Calyx" P4 the speed is diminished owing to the increased space, and
the chips following the line of least resistance gravitate into the cup or Calyx P4
and are withdrawn when the rods are withdrawn for the removal of the core.
It will thus be seen that by means of my invention it is possible to effect the
rotation of the boring tubes or rods in a very convenient manner that permits
of the sections or series of tubes or rods being continuously introduced and fed
without the necessity of the withdrawal or partial withdrawal of any of the
sections or series while the connection is capable of being readily effected and
the disconnection in like manner upon the simple reversal of the engine; the
"

page_text: arrangement of snap or gripping jaws being such as to facilitate the connection
or disconnection of the series or sections of tubes by sustaining those series or
sections remaining in the bore; the whole affording a simple and expeditious
means whereby the operation of boring is effected with great facility and
economy.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is:-
1. A boring apparatus constructed as hereinbefore described.
2. In boring apparatus means for effecting the rotation of the boring rods or
tubes consisting of a device engaging with the rods or tubes but permitting
free endwise movement thereof, substantially as herein before described.
3. In boring apparatus means for effecting the rotation of the boring rods or
tubes consisting of arms or jaws mounted upon a spur or bevel wheel or rotating
dome, such arms or jaws engaging with the rods or tubes and permitting free
endwise movement thereof, substantially for the purposes described.
4. In boring apparatus means for effecting the rotation of the boring rods or
tubes consisting of a fixed axle or base upon which a spur or bevel wheel or
rotating dome is mounted for carrying the driving arms or jaws, in the manner
herein before described.
5. In an apparatus for boring, the combination with the boring rod or tube
hollow throughout and angular or irregular in cross section, of a device for
rotating the rod or tube and for permitting endwise movement substantially as
described.
G. In means for effecting the rotation of the rods or tubes of boring apparatus,
the provision of driving arms or clamping jaws capable of adjustment and other-
wise formed substantially as and for the purposes hereinbefore described and
illustrated in the drawings.
7. In means for effecting the rotation of the rods or tubes of boring apparatus,
the provision of a rotating dome mounted upon a fixed axle or base and of a
form substantially as illustrated.
8. Means for effecting the rotation of the rods or tubes of boring apparatus
to the accompanying
substantially es hereinbefore described with reference
drawings.
9. In boring apparatus means for sustaining the weight of the inserted rods
or tubes upon introduction or disconnection of constituent lengths or parts
thereof consisting of snaps jaws or arms substantially as hereinbefore described.
10. In boring apparatus means for sustaining the weight of the inserted rods
or tubes upon introduction or disconnection of the constituent lengths or parts
thereof consisting of snaps jaws or arms pivoted within a fixed axle or base and
having their engaging extremities formed to engage with coupling pieces that
connect the lengths or parts of the rods together substantially as described.
11. In boring apparetus means for sustaining the weight of the inserted rods
or tubes upon introduction or disconnection of the constituent lengths or parts
thereof consisting of snaps jaws or arms pivotted within a fixed axle or
base and having their engaging extremities formed to engage with coupling
pieces that connect the lengths or parts of the rods together, and means for operat-
ing said snaps jaws or arms substantially as hereinbefore described.
12. In boring apparatus in combination means for effecting the rotation of
the rods or tubes and means for sustaining the weight thereof upon introduction
or disconnection substantially as hereinbefore described.
13. In boring apparatus, the combination with a drill red made up of sections
and coupling pieces connecting such sections, of snaps jaws or arms for engaging
the coupling piece or rod and holding same against rotation, and a rotary device
adapted to engage the coupling or rod whereby the rotary movement of the rotary

page_text: device operates to effect connection or disconnection or to rotate the rod sub-
stantially as described.
14. In boring apparatus such as hereinbefore specified a coupling piece sub-
stantially as and for the purposes herein before described and illustrated in the
accompanying drawings.
15. In boring apparatus such as herein before described a stationary axle or base
substantially of the form and for the purposes herein before described and illus-
trated.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.