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Патент USA US3036831

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May 29, 1962
H, D. LETTs
3,036,821
DIRIGIBLE MINING AUGER
Filed March lO, 1961
4 Sheets-Sheet 1
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May 29, 1962
H. D. LETTs
3,036,821
DIRIGIBLE MINING AUGER
F‘iled March l0, 1961
4 Sheets-Sheet 2
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BY
May 29, 1962
3,036,821
H» D.‘L.ETTS
DIRIGIBLE MINING AUGER
- Filed March l0, 1961
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4 Sheets-Sheet 3
May 29, 1962
3,036,821
H. D. LETTS
DIRIGIBLE MINING AUGER
Filed March l0, 1.961
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United Stat
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3,036,821
rPatented May 29, 1962
2
drivingly connected to the socket 30 of the driven shaft
29 by means of a couplingmember 3S. The coupling
member 35 has a hexagonal socket 36 on one end, FIG
URES 2 and 3, which loosely receives a hexagonal por
3,036,821
DIRIGIBLE MINING AUGER
Harold D. Letts, 304 S. Main St., Zelienople, Pa.
Filed Mar. 10, 1961, Ser. No. 94,734
5 Claims. (Cl. 262-26)
tion 37 provided on the rearward end of the auger shaft
trailing end portion 33, and has a hexagonal part 38 on
This invention relates to a dirigible mining auger.
the other end which is received in and embraced by the
An object of the present invention is to provide a
socket 30.
dirigible mining auger which is operable from the outside
As shown in FIGURES 1 and 1A,.4 and 4A, the trail
of a hole being bored to position the boring head for IO ing end portion 33 of the auger shaft 32 includes two
boring in the desired direction.
sections 33a and 33h arranged in confronting end-to-end
Another object of the present invention is to provide
relation, the confronting ends being connected together
a dirigible mining auger which, during operation in a hole
by a coupling 4l which permits lateral play, The coupling
being bored, may be shifted to a position in which the
41, FIGURE 4, comprises a tube 42 which has an end
boring head will bore in a straight direction, in an up 15 portion ñxedly supported in the confronting end of the
wardly direction, or in a downwardly direction.
section 3311, and has the other end portion extending
A further object of the present invention is to provide
loosely into a sleeve 43 -ñxedly supported in the confront
a dirigible mining auger which lends itself to ready
ing end of the section 33a, the other end portion of the
assembly in a hole being bored.
tube 42 being held in position within the sleeve 43 by
A still further object of the present invention is to pro 20 means of a coupling pin 44 which releasably seats in
vide a dirigible mining auger which is highly efficient in
registering holes 45’ and 45 provided in the sleeve 43
action, and commercially feasible.
and the other end portion of the tube 42 respectively.
Other objects and advantages will become apparent
from the following description taken in conjunction with
the accompanying drawings, in which:
FIGURES l and 1A represent a plan view of the diri
The coupling pin is releasably held in coupling position
by means of a spring-biased latch bar 44’ supported upon
25 the top of the section 33a of the trai-ling end portion 33
of the auger shaft 32, the latch bar having a free end
portion so shaped as to receive and detachably engage
vention in working position within a hole being bored in
a tapered flange 43’ on the pin 44, as clearly shown in
a coal vein;
FIGURE 4. It is to be noted that the sleeve 43 carries
FIGURE 2 is an enlarged view, with parts broken 30 a conveyor flight 46 which matches the conveyor flights
away and in section, taken on the line 2-2 of FIGURE l;
47 on the sections 33a and 33h of the trailing end portion
FIGURE 3 is a plan View, with parts broken away,
33 of the auger shaft 32.
and in section, taken on the line 3-3 of FIGURE 2;
Flexible coupling means indicated generally by the
FIGURE 4 is a side elevational view, partly in section,
numeral 50 connects the rear end of the leading end
of the trailing end portion of the auger shaft of the min 35 portion 34 of the auger shaft 32 to the front end of the
ing auger »assembly according to the present invention;
trailing end portion 33 of the auger shaft 32 or the non
FIGURE 4A is a side elevational 'sectional View of the
confronting end of the section 3'3b of the trailing end
leading end portion of the auger shaft and boring head
portion 33 of the auger shaft 32. Speciñcally, the cou-V
of the mining auger assembly according to the present
pling means comprises, FIGURES 4, 4A, 6, 7, a female
gible mining auger assembly according to thefpresent in
invention in position in which the boring head will bore 40 coupling member 51 which is tìxedly supported in the
in a straight direction;
non-confronting end of the section 33b of the trailing
FIGURE 5 is a sectional view taken on the line 5_5
end portion 33 of the auger shaft 32, the female member
of FIGURE 4A;
being provided on its inner face with teeth 52. A male
FIGURE 6 is a side elevational sectional view of the
coupling member 53 is iñxedly supported in the rear end
leading end portion of the auger shaft and boring head 45 of the leading end portion 34 of the auger shaft 32, the
adapted so that the boring head will bore in an upwardly
male member being provided with external teeth. A
direction;
locking split ring 55 is slipped over the teeth 54 until it
FIGURE 7 is a side elevational sectional view of the
drops behind'the teeth 54 and surrounds the adjacent
auger shaft showing the end portion and boring head of
portion of the male member 53. 'Ihe male coupling
FIGURE 6, but shifted so that the boring head will bore 50 member carrying the ring S5 is then inserted into the
in a downwardly direction;
p
female member 51 until the free end of the male member
FIGURE 8 is an end view, on a reduced scale, taken
53 abuts the shoulder 51’ on the female member 5l,
on the Iline 8_8 of FIGURE 4A; and
whereupon a two-part semicircular flange 51” is disposed
IFIGURE 9 is an end view, on a reduced scale, taken
so as to surround the male member 53 adjacent the open
on the line 9_9 of FIGURE 4.
55 end of the female member Si, the ñange being íixedly
Referring to FIGURES 1 and 1A of the drawings, the
secured to the female member 5l as by welding to there
numeral 20 generally designates a supporting frame, the
frame including »a pair of laterally-spaced rear posts 2ï
and a pair of laterally-spaced front posts 22. The frame
comprises longitudinal side members 23 extending be 60
tween and secured to the posts 21 and 22. A carriage 25
is slidably mounted on the side lmembers 23 and carries
a motor 26 whose shaft 27 is operatively connected to a
transmission 28, the transmission having a driven shaft
by hold the male member 53 in interlocking relation with
the female member 51. The female member 5l carries a
conveyor flight 56 which matches the conveyor llights 4'7
on the sections 33a and 3311 of the trailing end portion 33
of the auger shaft 32, and also conveyor ñights 57 on
the leading end portion 34 of the auger shaft 32.
Circumposed about and connected to the front end part
0f the auger shaft leading end portion 34 is a boring
29 projecting therefrom. The end of the driven shaft 29 65 head 60 which is provided at equally spaced intervals with
has a hexagonal socket 30 which is attached to a hollow
cutter teeth 61. rllhe front end of the leading end portion
auger shaft 32, FIGURES l, 2 and 3.
34 of the auger shaft 32 terminates in a conical spiral cut
The hollow auger shaft 32, FIGURES l and 1A, in
ter point 62 having rows of cutting teeth 63 along opposite
cludes a trailing end portion 33 and a leading end por
sides thereof.
tion 34 which is flexibly connected to the trailing end 70 A plurality of hollow tubular spokes 65, FIGURES lA,
portion 33 for movement with the latter. The rear end
4A, 6, 7, 8, are disposed radially about the leading end
of the trailing end portion 33 of the auger shaft 32 is
portion 34 of the auger shaft 32 inwardly of and adjacent
3,036,821
of the auger hole 75, and the longer spoke 83 engages the
point of the wall in the upper half of the auger hole 75.
An actuator 85 is disposed within the auger shaft 32
and has one end operatively connected to the base 71 of
the conical member 70 and has the other end exteriorly
of the rear end of the trailing end portion 33 of the auger
the cutter head 60, the inner ends of the spokes 65 being
íixedly secured to the leading end portion ‘34. A stem 66,
FIGURE 8, is slidably supported in each of the spokes 65
and has an inner end which is within the leading end por
tion 34 of the auger shaft 32 and has an outer end which
is exteriorly of the outer end of the adjacent spoke 65. A
shoe 67 is on the outer end of each of the stems 66.
shaft 32.
A
Means or a slide 40 is mounted for reciproca
tory movement on the intermediate part of the coupling
coil spring 68 is operatively connected to each stem 66 for
member 35, and said slide is operatively connected to the
biasing the stems toward the conical members 70‘ mount
ed within leading end portion 34 of the auger shaft 32, 10 other end of the actuator, the slide, upon execution of its
reciprocatory movement, effecting the forward-and-back
only one of the stems 66 having the coil spring operatively
Ward movements of the conical member 70. Specifically,
connected thereto being shown in FIGURES 6 and 7.
the actuator 85, FIGURES l, 2, 3, 4 and 4A, comprises a
The cam embodying an elongated conical member 70
push member 86 having one end operatively connected to
is mounted within the leading end portion 34 of the auger
shaft 32 for longitudinal forward-and-backward move 15 the base 71 of the conical member 70 and a plurality of
rods 87 arranged in free end-to-end abutting relation are
ment. The conical member 70 is free to rotate with the
positioned on the side opposite the push member 86 and
auger shaft 32 although it is mounted within the leading
have the end of the adjacent rod bearing freely against
portion 34 of the auger shaft for longitudinal movement
the other end of the push member 86, the free end por
relative to the auger shaft. The conical member 70 is
normally disposed so that the intermediate part extends 20 tion of the foremost rod 87 extending exteriorly of the
rear end of the rear end portion 33 of the auger shaft 32
slidably between and engages the inner ends of the stems
with the free end of the hindmost rod 87 being attached
66 and has a base 7‘1 on the side of the spokes 65 re
to the slide 40 by means of a bar 88. The bar 88 is sup
ported in a bearing 88’ which encompasses and is slidable
mote from the boring head 60 and has the apex 72 on the
side of the spokes 65 adjacent the boring head 60, the
position of FIGURE 4A, and the one ‘in which the bor
ing head 60 will bore in a straight direction. The coni
25 along the coupling member 35. A coil spring 89 is opera
tively connected to the push rod 86, such spring effecting
the backward movement of the conical member 70. The
cal member 70, when normally disposed, projects each
of the shoes 67 against the action of the respective springs
slide 40, as shown in FIGURE 3, is rollably supported by
rollers 46a on the side members 23 of the supporting
68 when each of the shoes is in the lowermost position, to
engage the wall of the auger hole 75, FIGURE 4A, to 30 frame.
A pair of hydraulic cylinder asemblies 90 and 91, FIG
»thereby fix and steer the boring head 60 so as to bore in a
URE 3, are 'operatively connected to the slide 40, and
straight direction. Projecting longitudinally from the apex
actuation of the piston rods 92 and 93 respectively of said
72 of the conical member 70 is a bar 76 which is slidably
assemblies effects the reciprocatory movement of the slide
supported in a fixed collar 77 disposed within the leading
40 and consequent forward-and-backward movement of
end portion 34 of the auger shaft 32 inwardly of and
the conical member 70. To effect the forward stroke of
adjacent the cutter point 62. It is to be noted that the
the slide 40, with the auger shaft 32 being rotated by the
base 71 of the conical member 70 slidably engages the
driven shaft 29 and the carriage 25 advancing, ñuid under
leading end portion 34 of the auger shaft 32, and this slid
pressure is admitted through the line 95 to the assem
ing engagement of the base 71 with the leading end por
tion 34 and of the bar 76 with the collar 77 constitutes the 40 blies -96 and 91, resulting in the piston rods 92 and 93
moving in a forwardly direction and simultaneously
mounting of the conical member 70 for longitudinal for
therewith the execution of the forward stroke of the slide
ward-and-backward movement within the leading end por
40 `and of the forward movement of the conical member
tion 34 of the auger shaft 32.
70. When it is desired to effect the rearward stroke of
By virtue of the contour of the conical member 70,
the shoes 67 are projected equally and cannot be extended 45 the slide 40, with Vthe auger shaft 32 being rotated by the
driven shaft 29 and the carriage advancing, ñuid under
to a radius of more than one-half (1/2) of the diameter of
pressure is admitted through the line 96 to the asemblies
the auger hole 75. The projected shoes 67 exert a steer
90 and v91, resulting in the piston rods 92 and 93 moving
ing function, and such function depends upon the rela
in a rearwardly direction and simultaneously therewith
tionship of the position of the projected shoes, and the
diameters of the boring head 60 or auger hole, and of the 50 the execution of the rearward stroke of the slide 40 and
of the rearward movement of the conical member 70.
trailing end portion 33 of the auger shaft 32.
In operation, with the auger shaft assembly in posi
It is preferred that the trailing end portion 33 of the
auger shaft 32 be provided with eccentric non-rotating
tion within the auger hole 75 and the boring head in
position to bore in the hole in a straight direction, the
guide spiders, each of said spiders being indicated by the
numeral 80 with a spider 80 being applied to the section
33b of the trailing end portion 33 inwardly of and ad
jacent the flexible coupling means 50 and another spider
80 being applied to the section 33a of the trailing end por
-ion 33 inwardly of and adjacent the coupling 41, as shown
in FIGURES 1A and 4. The purpose of these guide 60
spiders is to keep the rearward portion of the boring head
60 on the vertical center line of the hole 75 being bored
and maintain an angle of incidence in a vertical direction.
Each spider 80, FIGURE 9, includes a hub 81 which is
circumposed about and rotatably supported on a bear
ing 81’ seated in a retainer ring 81” which encompasses
and is welded to the adjacent part of rthe section 33a of
the trailing end portion 33 adjacent the confronting end
of the aforesaid section, and radially disposed about the
hub 81 and fixed thereto are a plurality of rigid spokes,
two of the spokes being of like size and indicated by the
numeral 82, and the other of the spokes being indicated
by the numeral 83 and being longer than the two spokes
82. The spider is so disposed that the two shorter spokes
82 engage opposite points of the Wall of 4the lower half
auger shaft 32 is caused to rotate by means of the driven
shaft 29 and as the auger shaft projects the boring in a
straight direction in the hole 75 the carriage 25 is caused
to advance as the projected boring progresses.
Should it be desired to project the boring in an up
wardly direction in the auger hole 75, while the auger
shaft 32 is being rotated by the driven shaft 29 and the
carriage 25 is advancing, fluid under pressure is admitted
through «the line 95 to the cylinder assemblies 90` and 91,
resulting in the piston rods 92 and 93 moving in a for
65 wardly direction and simultaneously therewith the execu
tion of the forward stroke of the slide 40 and of the for
ward movement of the conical member 70. The execu
tion of the forward movement of the conical member 70
projects the shoes 67 equally and when each shoe is in
the lowermost position to engage the wall of the auger
hole 75 to thereby íix and steer the boring head 60 so
as to project the boring in an upwardly direction, as
shown in lFIGURE 6.
When it is found desirable to project boring in a down
wardly
direction in the auger hole 75, while the auger
75
shaft 32 is being rotated by the driven shaft 29 and the
3,036,821
5 i
carriage 25 is advancing, fluid under pressure is admitted
through the line 96 to the cylinder assemblies l90 and 91,
resulting in the piston rods `92 and 93 moving in a back
wardly direction and simultaneously therewith the execu
tion of the backward stroke of the slide 40, the coil spring
`89 causing the conical member 70 to execute its backward
movement. The execution of the backward movement
0f the conical member 70 projects the shoes 67 equally
6 c
nected to the front end part of said auger shaft leading
end portion for rotation with the latter-named portion, a
plurality of spokes disposed radially about said auger shaft
leading end portion inwardly of and adjacent said cutter
head and having inner ends fixed to said auger shaft lead
ing end portion and having outer ends, a stem slidably
supported in each of said spokes and having an inner end
within said auger shaft leading end portion and having an
outer end exteriorly of the outer end of the adjacent spoke,
and when each shoe is in the lowermost position to en
gage the wall of the auger hole 7S to thereby fix and 10 a shoe on the outer end of each of said stems, a cam em
steer the boring head 60 so as to project the boring in a
bodying an elongated conical member mounted within
downwardly direction, as shown in FIGURE 7.
Although the trailing end portion 33 of the auger shaft
said auger shaft leading end portion for longitudinal for
32 is shown and described as comprising two sections 33a
and 33h, it is to be understood that the section 33b could
guide spider on the auger shaft trailing end'portion for
maintaining the angle of incidence in a vertical direction,
said conical member being normally disposed so that the
intermediate part extends slidably between and engages
comprise a substantial number of sections, for example,
2O to 30 sections like section 31317, of from l0 to 20
feet in length, so that lthe auger shaft 32 could project the
boring in the auger hole 75 to a depth of from 200 to 400
feet, or more.
What is claimed is:
l. In a mining auger, a hollow auger shaft including a
trailing end portion and a leading end portion flexibly
connected to the trailing end portion for movement with
ward-and-backward movement, an eccentric non-rotatable
the inner ends of said stems and has the base on the side of
said spokes remote from said boring head and has the apex
on the side of said spokes adjacent said boring head, said
conical member when normally disposed projecting the
shoes to a position to engage the walls of an auger hole
and fix and steer the boring head so as to bore in a straight
direction, an actuator disposed within said auger shaft and
the latter, means on the rearward end of said trailing end 25 having one end operatively connected to the base of said
portion for attachment to la driven shaft to impart rota
conical member and having the other end exteriorly of the
tional movement to said auger shaft, a boring head con
:rear end of said auger shaft trailing end portion, spring
nected to the front end part of said auger shaft leading
means »operatively connected to each of said stems for
end portion for rotation with the latter-named portion,
a plurality of spokes disposed radially about said auger
shaft leading end portion inwardly of and adjacent said
cutter head and having inner ends `fixed to said auger shaft
biasing the adjacent shoe toward said conical member,
means operatively connected to the other end of said
actuator for effecting the forward movement of said
conical member, and spring means operatively connected
leading end portion and having outer ends, a stem slid
to said actuator for effecting the backward movement of
ably supported in each of said spokes and having an inner
said conical member, said conical member upon execution
end within said auger shaft leading end portion and hav 35 of
its forward movement from the normal position pro
ing an outer end exteriorly of the outer end of the ad
jecting the shoes to a position to engage the wall of an
jacent spoke, a shoe on the outer end of each of said
stems, a cam embodying an elongated conical member
mounted within said auger shaft leading end portion for
longitudinal forward-and-backward movement, an eccen
tric non-rotatable guide spider on the auger shaft trail
ing end portion for maintaining the angle of incidence in
a vertical direction, said conical member being normally
disposed so that the intermediate part extends slidably
auger hole and tix and steer the boring head so as to bore
in an upwardly direction and upon execution of its back
ward movement from the normal position permitting the
shoes under the action of the springs associated with the
stems to be retracted to a position to engage the wall of
an auger hole and fix and steer the boring head so as to
bore in a downwardly direction.
3. In a mining auger, a hollow auger shaft including a
between and engages the inner ends of said stems and 45 trailing end portion and a leading end portion flexibly
has the base on the side of said spokes remote from said
connected to said trailing end portion for movement with
boring head and has the apex on the side of said spokes
the latter, means on the rearward end of said trailing end
adjacent said boring head, said conical member when
portion for attachment to a driven shaft to impart rota
normally disposed projecting the shoes to a position to
tional movement to said auger shaft, a boring head con
engage the walls of an auger hole and tix and steer the 50
nected to the front end part of said auger shaft leading
boring head so as to bore in a straight direction, an ac
end portion for rotation with the latter-named portion, a
tuator disposed within said auger shaft and having one
plurality of spokes disposed radially about said auger shaft
end operatively connected to the base of said conical
leading end portion inwardly of and adjacent said cutter
member and having the other end exteriorly of the rear
and having inner ends fixed to said auger shaft lead
end of said auger shaft trailing end portion, spring means 55 head
ing end portion and having outer ends, a stem slidably
operatively connected to each of said stems for biasing
supported in each of said spokes and having an inner end
the adjacent shoe toward said conical member, and means
within said auger shaft leading end portion and having
operatively connected to the other end of said actuator
an outer end exteriorly of the outer end of the adjacent
for effecting the forWard-and-backward movement of
spoke, a shoe on the outer end of each of said stems, a
said conical member, said conical member upon execu 60 cam embodying an elongated conical member mounted
tion of its forward movement from the normal position
within said auger shaft leading end portion for longitudinal
projecting the shoes to a position to engage the wall of an
auger hole and ñx and steer the boring head so as to bore
in an upwardly direction and upon execution of its back
forward-and-backward movement, an eccentric non-rotat
able guide spider on the auger shaft trailing end portion
for maintaining the angle of incidence in a vertical direc
ward movement from the normal position permitting 65
tion, said «conical member being normally disposed so
the shoes under the action of the springs associated with
the stems to be retracted to a position to engage the wall
of an auger hole and fix and steer the boring head so as
to bore in a downwardly direction.
2. In a mining auger, a hollow auger shaft including a
that the intermediate pant extends slidably between and
engages the inner ends of said stems and has the base on
the side of said spokes remote from said boring head and
has the apex on the side of said spokes adjacent said bor
head, the conical member when normally disposed
trailing end portion and a leading end portion flexibly 70 ing
projecting the shoes to a position to engage the wall of
connected to the trailing end portion for movement with
an auger hole and ñx and steer the boring head so as to
the latter, means on the rearward end of said trailing end
bore in a straight direction, an actuator disposed within
portion for attachment to» a driven shaft to impart rota
said auger shaft, said actuator embodying a push rod hav
tional movement to said auger shaft, a boring head con 75 ing one end operatively connected to the base of said
3,036,821
conical member and a plurality of rods arranged in free
end-to-end abutting relation positioned on the side oppo
site said push rod and having the end of the adjacent rod
bearing freely against the other end of said push rod and
having the free end portion of the hindmost rod exteriorly
of the rear end of said auger shaft rear end portion, a
reciprocatory slide operatively connected to the free end
of the hindmost rod for effecting the forward movement
of said conical member, spring means operatively con
nected to each of said stems for biasing1 the adjacent shoe
toward said conical member, and spring means operatively
connected to said push rod for effecting the backward
movement of said conical member, said conical member
upon execution of its forward movement from the normal
position projecting the shoes to a position to engage the
wall of an auger hole and fix and steer the boring head so
as to bore in an upwardly direction and upon execution
of its backward movement from the normal position per
mittin-g the shoes under the action of the springs associated
with the stems to be retracted to a position to engage the
wall of an auger hole and fix and steer the boring head
so as to bore in a downwardly direction.
4. In a mining auger, a hollow auger shaft including a
trailing end portion and a leading end portion arranged
forwardly of said trailing end portion and having the rear
8
movement from the normal position permitting the shoes
under the action of the springs associated with the stems
to be retracted to a position to engage the wall of an
auger hole and fix and steer the boring head so as to bore
in a downwardly direction.
5. Ina mining auger, a hollow auger shaft including a
trailing end portion and a leading end portion arranged
forwardly of said trailing end portion and having the rear
end in end-to-end relation with respect to the forward end
of said trailing end portion, ñexible coupling means con
necting the rear end of said leading end portion to the
forward end of said trailing end portion, means on the
rearward end of said trailing end portion for attachment
to a driven shaft to impart rotational movement to said
auger shaft, a boring head connected to the front part of
said auger shaft leading end portion for rotation with the
latter-named portion, a plurality of spokes disposed radi
ally about said auger shaft leading end portion inwardly
of and adjacent said cutter head and having inner ends
ñxed to said auger Shaft leading end portion and having
outer ends, a stem slidably supported in each of said spokes
and having an inner end within said auger shaft leading
end portion and having an outer end exteriorly of the outerj
end of the adjacent spoke, a shoe on the outer end of each
of said stems, a cam embodying an elongated conical
member mounted within said auger shaft leading end por
end in end-to-end relation with respect to the forward end
tion for longitudinal forward-and-backward movement,
of said trailing end portion, flexible coupling means con
said conical memiber being normally disposed so that the
necting «the rear end of said leading end portion to the for
intermediate part extends slidably between and engages
ward end of said trailing end portion, means on the rear
ward end of said trailing end portion for attachment to a 30 the inner ends of said stems and has the base on the side
of said spokes remote from said boring head and has the
driven shaft to impart rotational movement to said auger
apex on the side of said spokes adjacent said boring head,
shaft, a boring head connected to the front end part of said
an eccentric non-rotatable guide spider on the auger shaft
auger shaft leading end portion for rotation with the
trailing end portion for maintaining the angle of incidence
latter-named portion, a plurality of spokes disposed radi
ally about said auger shaft leading end portion inwardly 35 in a vertical direction, said conical member when nor
mally disposed projecting the shoes to a position to engage
of and adjacent said cutter head and having inner ends
the wall o-f an auger hole and fix and steer the boring head
fixed to said auger shaft leading end portion and having
so as to bore in a straight direction, an actuator disposed
outer ends, a stem slidably supported in each of said spokes
within said auger shaft, said actuator embodying a push
and having an inner end within said auger shaft leading
end portion and having an outer end exteriorly of the 40 rod having one end operatively connected to the base of
said conical member and a plurality of rods arranged in
outer end of the adjacent spoke, a shoe on the outer end
free end-to-end abutting relation positioned on the side
of each of said stems, a cam embodying an elongated
opposite to said push rod and having the end of the
conical member mounted within said auger shaft `leading
adjacent rod bearing freely against the other end o-f said
end portion for longitudinal forward-and-backward move
ment, an eccentric non-rotatable guide spider on the auger 45 push rod and having the free end portion of the hindmost
shaft trailing end portion for maintaining the angle of
rod exteriorly of the rear end of said auger shaft rear end
spokes adjacent said boring head, said conical member
when normally disposed projecting the shoes to a position
means operatively connected to said push rod for effecting `
portion, a reciprocatory slide operatively connected to
incidence in a vertical direction, said conical member being
the free end of the hindmost rod for effecting the forward
normally `disposed so that the intermediate part extends
movement of said conical member, spring means opera
slidably between and engages the inner ends of said stems
and has the base on the side of said spokes remote from 50 tively connected to each of said stems for biasing the
adjacent shoe toward said conical member, and spring ,
said boring head and has the apex on the side of said
the backward movement of said conical member, said
conical member upon execution of its forward movement
to engage the wall of an auger hole and ñx and steer the
boring head so as to bore in a straight direction, an 55 from the normal position projecting the shoes to a position
to engage the wall of an auger hole and fix and steer
actuator disposed within said auger shaft and having one
the boring head so as to -bore in an yupwardly direction and
end operatively connected to the base of said conical
upon execution of its backward movement from the nor
member and having the other end exteriorly of the rear
mal position permitting the shoes under the action of the
end of said auger shaft trailing end portion, spring means
operatively connected to each of said stems for biasing the 60 springs associated with the stems to be retracted to a
position to engage the wall of an auger hole and ñx and
adjacent shoe toward said conical member, and means
steer the boring head so as to «bore in a downwardly
operatively connected to the other end of said actuator for
direction.
effecting the forward-‘and-backward movement of said
conical member, said conical member upon execution of
References Cited in the file of this patent
its forward movement from the normal position projecting 65
the shoes to a position toi engage the wall of an auger hole
UNITED STATES PATENTS
and fix and steer the boring head so as to bore in an
upwardly direction and upon execution of its vbackward
2,715,526
Letts _______________ __ Aug, 16, 1955
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