CA1134343A - Earth boring auger - Google Patents
Earth boring augerInfo
- Publication number
- CA1134343A CA1134343A CA000359122A CA359122A CA1134343A CA 1134343 A CA1134343 A CA 1134343A CA 000359122 A CA000359122 A CA 000359122A CA 359122 A CA359122 A CA 359122A CA 1134343 A CA1134343 A CA 1134343A
- Authority
- CA
- Canada
- Prior art keywords
- auger
- rings
- sleeve
- bit
- valve members
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 244000273618 Sphenoclea zeylanica Species 0.000 claims abstract description 9
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- 230000036346 tooth eruption Effects 0.000 claims abstract description 4
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 230000000295 complement effect Effects 0.000 claims description 2
- 230000010006 flight Effects 0.000 description 9
- 238000005070 sampling Methods 0.000 description 6
- 239000002689 soil Substances 0.000 description 6
- 230000035515 penetration Effects 0.000 description 3
- 101100310856 Drosophila melanogaster spri gene Proteins 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000012353 t test Methods 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Earth Drilling (AREA)
Abstract
ABSTRACT
In a hollow stem auger for earth boring of the kind having spring loaded valve members at the bottom of the stem to permit the passage of test implements such as corers and vane test implements, the auger bit is constructed with a cage formation enclosing the valve member and supporting a bottom ring carrying cutting teeth. Interference of the valve members with a test implement is prevented by using an uncoupleable cylindrical sleeve surrounding the implement which sleeve can be lodged between the valve members to hold them open during use of the implement.
In a hollow stem auger for earth boring of the kind having spring loaded valve members at the bottom of the stem to permit the passage of test implements such as corers and vane test implements, the auger bit is constructed with a cage formation enclosing the valve member and supporting a bottom ring carrying cutting teeth. Interference of the valve members with a test implement is prevented by using an uncoupleable cylindrical sleeve surrounding the implement which sleeve can be lodged between the valve members to hold them open during use of the implement.
Description
~343~ :
FIELD OF THE INVENTION ~ `
This invention relates to augers ~ntended for earth boring, of the kind having hollow stems to ~acilitate the recovery of samples or the making of tests during boring.
BACKGROUND OF THE INVENTION AND
PRIOR ART STATEMENT
When recovering samples using hollow stem augers, the normal procedure has been to remove a closure at the bottom of the hollow stem using a string of rods which are then withdrawn and used to lower a sampling tu~e or testing tool to the now open bottom of the stem. The tool is then withdrawn again and the closure replaced, again using the string of rods. Parti-cularly with a deep bore, this procedure is extremely laborious and time consuming, and may require to be repeated at ~uite frequent intervals.
For this reason proposals have been made to provide closure means at the bottom o~ the~stem which can remain in situ ~
during sampling and testing operations. Examples o~ such ~ -proposals are contained in United States Patent No~ 3,095,051 issued June 25, 1963 to Robinsky et al, and Canadian Patent No. 711,139 issued June 8, 1965 to Ro~insky. In the first of these patents, the bottom of the auger tube is closed by a valve formed by two spring leaves extending from the bottom of the tube in a cusp-like formation. A sampling tube can be thrust between the valve members ~ormed by these leaves so as to penetrate the soil beneath, and the lea~es will spring back into place so as to close the auger stem when the ~ube is withdrawn. In the second patent, the bottom of the tube is closed by shaped rigid hinged valve members spring urged towards a closed condition. These members also are arranged to be thrust apart ~y a sampling tube.
With these arrangements it is necessary for the flights of the auger to project forwardly of the spring or valve members, which reduces the support available to the forward portions of 3~3~3 the flights and weakens the structure of the auger. Moreover the spring or other valve members are somewhat vulnerable to damage. The valve arrangement increases the cost of the auger, thus providing a substantial financial burden if a range of ~.
augers are required to suit different soil conditions, or if ~.
frequent repair or replacement is re~uired. It is known to provide earth boring augers with detachable teeth at their leading ends which can be exchanged or replaced as necessary, but these teeth usually require a di.stribution such.that they cannot solely be supported by the leading ends of the flights. In the valved hollow stem augers cons.idered above, the stem of the auger must :
stop short of the valve and i.s thus not availa~le to support detachable teeth.
A powerful spri.ng action must be provided by the spring leaves or applied to the valve members to bias them to a closed ~, position, so as to.ensure the avoidance o~ unwanted opening during boring and assured clos.ing.when a sampling tube i.s with- :
drawn. This powerful spri.ng action means that considerable force is required to pass a sampling tube or other tool through the closure, and once so passed, it is gripped quite tigh*ly by the spring leaves or valve members... One reason for using a hollow ::
stem auger i5 to permi.t tests of the ground being ~ored hy for example determining its resi.6tance to rotation or penetration of test implements, and the gripping action of the spring leaves or other valve members interferes with.such tests and prevents the .
obtaining of meaningful results.. The present invention is directed to overcoming these problems.
SUMMARY OF THE INVENTIQN .~ ;
In one aspect of the~;nventi.on, an auger as described `:~
in U.S. Patent No. 3,095,051 or Canadian Patent No. 711,13~ is improved by taking the auger flights at the leading end of a hollow stem auger bit to a ring coaxial with the bit and beyond . the outer ends of the spring leaves or other valve members, the :
L3~L343 r.ing carrying a plurality of detachable cutting teeth distributed around its periphery. This results in an auger bit in the form of a rigid cage, the valve members bei.ng protected by the cage.
In another aspect of the invention, the lowermost of a string of rods utilized for raising and lowering and actuating test imple-ments through a hollow stem auger, with.a valve at the lower end of the tube spring biased to a normally closed position, carries an external concentric sleeve ~apable o~ passage at least partially through.the valve and means releasably connecting the sleeve to said rod whereby the latter may ~e lowered either conjointly with or independently.of said sleeve. The string of rods may thus be used to pass the sleeve partially through.the valve 50 as to hold the latter open, whereupon the sleeve may be released from the lowermost rod so.that the rods may be used to lower an implement into the soi.l beneath the auger. Preferably ~ ;
. .
the releasable connecti.on is a key and keyway t~pe coupling which may be released and engaged b.~ simple rotation of the string of rods relative to the sleeve.
Other features o~ the. invç.ntion will be apparent from the ~ollowi.ng description of a preferred embodiment with reference to the accompanying drawings.
SHORT DESCRIPTION OF T~IE DR~INGS
In the drawings:
Figure 1 is a vertical sectional view showing an auger in accordance with the invent;on, in use;
Figures 2 and 3 are different side elevations of the , .
auger bit;
Figure 4 is a secti.on through the auger bit on the line 4-4 in Figure 2;
E~igure 5 is a vi.ew of the lower end of the auger bit;
Figure 6 is a part elevational~ part section view of ~ -the lower end of a string of rods used to lower and actuate a testing implement through the auger; and ~ :
11~43~3 I Figure 7 is a transverse section on the line 6-6 in Figure 6.
DESCRIPTION O~' THE PREFERRED EMBODIMENT
Referring to Figures 1 - 5, an auger bit 2 has helical flights 4, and is supported by tubular member 6 having external flights 8, the flights serving to lift spoil 10 loosened by teeth 12 up the bore 14 formed by the auger in ground 16 being bored as the bit 2 is rotated~ The bit 2 is coupled to the member 6 by a coupling sleeve 18 secured by locking pins so that the bit rotates with thR sleeve. In order to obtain a core `~
sample o~ the soil beneath,the auger, a sample tube 20 may he passed down the tube formed by the member 6 and the bit 2, driven into the soil and withdrawn so as to extract the desired sample. It will be understood that both the member 6 and the tube 2a may be upwardly extended respectiveIy by as many tubes and rods (,not shown) as may be necessitated by the depth of the bore hole. -The bit 2 ha~ an upper ring 22 integral with the coupling 18 and a lower ring 24 spaced below and concentric 20, with the upper ring and the member 6. Two spaced plane parallel `
side walls 26 connect the rings internally of the flights 4 so as to provide a rigid cage atructure, the side wall being radially external of concentric circular openings 28, 30 formed by the rings at its upper and lower ends so as~to provide sufficient room internally to accommodate flexure of two spring leaves 32 within the cage structure as the tube 2~ is thrust between them. The spring leaves 32 are anchored to the upper ring 22 by anchor ~' blocks 34 and screws 36, and their operation i5 similar to that described in U.S. Patent No. 3,095,051. The valve formed by the spring leaves 32 could also be replaced if desired by the valve ~ ~;
arrangement shown in Canadian Patent No. 711,13~, in which rigid valve members are spring urged to a closed position. ~s compared to the bit structure of those patents, however, that of the L3~ 43 present invention is protected by the cage structure from accidental damage for example by rocks in the soi]. being bored.
With the prior art arrangements these could become engaged between the lower ends of the fli.ghts and exert considerable forces on the latter, as well as poss.ibly damaging the leaves 32. In the present arrangement, any such engagement with an ohstruction large enough to cause damage i.s prevented by the ring 24, wh.ich. ~:
also braces the flights and suppoxts th.e teeth 12. The teeth are held in place by screws lnot sh.own~ in outward projections from the ring 24 and can readi.l.~ ~e exchanged or replaced as required.
Their location need not, and in the example shown does not coincide with the ends of the fli.~hts, whose sole function hecomes the removal of spoi.1. .:~
As will b.e readil~ apparent from.Figure 1, the spring leaves 32 exert a firm gri.p on the tu~e 20 when it is inserted between them. Th.is grip i.s in some instances undesirable, :
particularly when implements other than coring tubes are employed to carry out tests on the ground beïng bored. Such.tests ;nclude vane tests in which. an implement wi.th radially extending vanes is rotated in the soi.l and, the reaï.stance to rotation is measured and penetration tests in.whi.ch..the res.istance of the soil to penetration by an implement is measured. Obviously engagement of the leaves 32 wi.th.such..an implement or its supporting rods will upset the results of the tests ~eing carried out. A manner in which this problem can.be overcome is shown in Figures 6 and 7.
The test implement sh.own hy way of example in this case : .
is a vane test implement having a shaft 4Q and a soil penetrating ~:
head formed by radial vanes 42. It is coupled to the bottom of a .. :
string of screw-coupled drilling .rods 44. The lowermost rod 45 of the string of rods is equi.pped ~ith. at least one and typically two projecting keys:46 secured thereto by screws 48, and may be no more than a short coupling piece as shown. A projecting washer 50 is capti.ve between the shaft 4Q and the rod 45 so as to be engageable with a shoulder 52 on a collar 54 which normally surrounds the rod 45 beneath the keys 46. The collar 54 which ~ :
normally surrounds the rod 45 beneath -the keys 46. The collar 54 is formed internally with keyways 56 spaced similarly to the keys 46 so that when the rod 45 and the collar are correctly ;: ;
relatively oriented, the keys can pass through the keyways in : :
the collar so as to permit the rods 44 and 45 to move downwardly relative to the collar unti1 the keys leave the lower end of the keyways. The collar 54 supports a sleeve 58 whi.ch surrounds ths implement and may either be screwed onto the collar as shown, or, if of small wall thi.ckness., anchored thereto by set-screws 60.
In use/ the test implement is lowered down the stem of the auger by means of the rods 44 and 45, with the collar 54 resting on the washer 50. so as to support the sleeve 58. When the bottom of the sleeve reaches the spring leaves 32, further :
lowering of the rods causes the k.ey 46 to engage the top o~ the collar 54 and thus to force th.e sleeve ~etween the leaves 32.
When the sleeve has moved partly through the valves formed by the leaves so as to hold the latter apart, the rods 44 and 45 are rotated until the keys 46 drop into and through the keyways 56, whexea~ter the implement may be lowered further and manipulated as desired by means of the rods without interference from the spring leaves 32. When the rods are withdrawn from the auger stem, the shoulder 52 on the collar.is engaged by the keys 46 or the washer SQ and the sleeve 58 i.s also withdrawn.
It will be appreci.ated that the means used for releasably : .
coupling the sleeve to the string of rods or the test implement could be different from those descri~ed. For example remotely .`
controlled means could be provided for withdrawing the keys 46 into the rod 45 to release the collar, but an arrangement using complementary keys and keyways LS simple and can be actuated by simple rotation of the string of rods.
FIELD OF THE INVENTION ~ `
This invention relates to augers ~ntended for earth boring, of the kind having hollow stems to ~acilitate the recovery of samples or the making of tests during boring.
BACKGROUND OF THE INVENTION AND
PRIOR ART STATEMENT
When recovering samples using hollow stem augers, the normal procedure has been to remove a closure at the bottom of the hollow stem using a string of rods which are then withdrawn and used to lower a sampling tu~e or testing tool to the now open bottom of the stem. The tool is then withdrawn again and the closure replaced, again using the string of rods. Parti-cularly with a deep bore, this procedure is extremely laborious and time consuming, and may require to be repeated at ~uite frequent intervals.
For this reason proposals have been made to provide closure means at the bottom o~ the~stem which can remain in situ ~
during sampling and testing operations. Examples o~ such ~ -proposals are contained in United States Patent No~ 3,095,051 issued June 25, 1963 to Robinsky et al, and Canadian Patent No. 711,139 issued June 8, 1965 to Ro~insky. In the first of these patents, the bottom of the auger tube is closed by a valve formed by two spring leaves extending from the bottom of the tube in a cusp-like formation. A sampling tube can be thrust between the valve members ~ormed by these leaves so as to penetrate the soil beneath, and the lea~es will spring back into place so as to close the auger stem when the ~ube is withdrawn. In the second patent, the bottom of the tube is closed by shaped rigid hinged valve members spring urged towards a closed condition. These members also are arranged to be thrust apart ~y a sampling tube.
With these arrangements it is necessary for the flights of the auger to project forwardly of the spring or valve members, which reduces the support available to the forward portions of 3~3~3 the flights and weakens the structure of the auger. Moreover the spring or other valve members are somewhat vulnerable to damage. The valve arrangement increases the cost of the auger, thus providing a substantial financial burden if a range of ~.
augers are required to suit different soil conditions, or if ~.
frequent repair or replacement is re~uired. It is known to provide earth boring augers with detachable teeth at their leading ends which can be exchanged or replaced as necessary, but these teeth usually require a di.stribution such.that they cannot solely be supported by the leading ends of the flights. In the valved hollow stem augers cons.idered above, the stem of the auger must :
stop short of the valve and i.s thus not availa~le to support detachable teeth.
A powerful spri.ng action must be provided by the spring leaves or applied to the valve members to bias them to a closed ~, position, so as to.ensure the avoidance o~ unwanted opening during boring and assured clos.ing.when a sampling tube i.s with- :
drawn. This powerful spri.ng action means that considerable force is required to pass a sampling tube or other tool through the closure, and once so passed, it is gripped quite tigh*ly by the spring leaves or valve members... One reason for using a hollow ::
stem auger i5 to permi.t tests of the ground being ~ored hy for example determining its resi.6tance to rotation or penetration of test implements, and the gripping action of the spring leaves or other valve members interferes with.such tests and prevents the .
obtaining of meaningful results.. The present invention is directed to overcoming these problems.
SUMMARY OF THE INVENTIQN .~ ;
In one aspect of the~;nventi.on, an auger as described `:~
in U.S. Patent No. 3,095,051 or Canadian Patent No. 711,13~ is improved by taking the auger flights at the leading end of a hollow stem auger bit to a ring coaxial with the bit and beyond . the outer ends of the spring leaves or other valve members, the :
L3~L343 r.ing carrying a plurality of detachable cutting teeth distributed around its periphery. This results in an auger bit in the form of a rigid cage, the valve members bei.ng protected by the cage.
In another aspect of the invention, the lowermost of a string of rods utilized for raising and lowering and actuating test imple-ments through a hollow stem auger, with.a valve at the lower end of the tube spring biased to a normally closed position, carries an external concentric sleeve ~apable o~ passage at least partially through.the valve and means releasably connecting the sleeve to said rod whereby the latter may ~e lowered either conjointly with or independently.of said sleeve. The string of rods may thus be used to pass the sleeve partially through.the valve 50 as to hold the latter open, whereupon the sleeve may be released from the lowermost rod so.that the rods may be used to lower an implement into the soi.l beneath the auger. Preferably ~ ;
. .
the releasable connecti.on is a key and keyway t~pe coupling which may be released and engaged b.~ simple rotation of the string of rods relative to the sleeve.
Other features o~ the. invç.ntion will be apparent from the ~ollowi.ng description of a preferred embodiment with reference to the accompanying drawings.
SHORT DESCRIPTION OF T~IE DR~INGS
In the drawings:
Figure 1 is a vertical sectional view showing an auger in accordance with the invent;on, in use;
Figures 2 and 3 are different side elevations of the , .
auger bit;
Figure 4 is a secti.on through the auger bit on the line 4-4 in Figure 2;
E~igure 5 is a vi.ew of the lower end of the auger bit;
Figure 6 is a part elevational~ part section view of ~ -the lower end of a string of rods used to lower and actuate a testing implement through the auger; and ~ :
11~43~3 I Figure 7 is a transverse section on the line 6-6 in Figure 6.
DESCRIPTION O~' THE PREFERRED EMBODIMENT
Referring to Figures 1 - 5, an auger bit 2 has helical flights 4, and is supported by tubular member 6 having external flights 8, the flights serving to lift spoil 10 loosened by teeth 12 up the bore 14 formed by the auger in ground 16 being bored as the bit 2 is rotated~ The bit 2 is coupled to the member 6 by a coupling sleeve 18 secured by locking pins so that the bit rotates with thR sleeve. In order to obtain a core `~
sample o~ the soil beneath,the auger, a sample tube 20 may he passed down the tube formed by the member 6 and the bit 2, driven into the soil and withdrawn so as to extract the desired sample. It will be understood that both the member 6 and the tube 2a may be upwardly extended respectiveIy by as many tubes and rods (,not shown) as may be necessitated by the depth of the bore hole. -The bit 2 ha~ an upper ring 22 integral with the coupling 18 and a lower ring 24 spaced below and concentric 20, with the upper ring and the member 6. Two spaced plane parallel `
side walls 26 connect the rings internally of the flights 4 so as to provide a rigid cage atructure, the side wall being radially external of concentric circular openings 28, 30 formed by the rings at its upper and lower ends so as~to provide sufficient room internally to accommodate flexure of two spring leaves 32 within the cage structure as the tube 2~ is thrust between them. The spring leaves 32 are anchored to the upper ring 22 by anchor ~' blocks 34 and screws 36, and their operation i5 similar to that described in U.S. Patent No. 3,095,051. The valve formed by the spring leaves 32 could also be replaced if desired by the valve ~ ~;
arrangement shown in Canadian Patent No. 711,13~, in which rigid valve members are spring urged to a closed position. ~s compared to the bit structure of those patents, however, that of the L3~ 43 present invention is protected by the cage structure from accidental damage for example by rocks in the soi]. being bored.
With the prior art arrangements these could become engaged between the lower ends of the fli.ghts and exert considerable forces on the latter, as well as poss.ibly damaging the leaves 32. In the present arrangement, any such engagement with an ohstruction large enough to cause damage i.s prevented by the ring 24, wh.ich. ~:
also braces the flights and suppoxts th.e teeth 12. The teeth are held in place by screws lnot sh.own~ in outward projections from the ring 24 and can readi.l.~ ~e exchanged or replaced as required.
Their location need not, and in the example shown does not coincide with the ends of the fli.~hts, whose sole function hecomes the removal of spoi.1. .:~
As will b.e readil~ apparent from.Figure 1, the spring leaves 32 exert a firm gri.p on the tu~e 20 when it is inserted between them. Th.is grip i.s in some instances undesirable, :
particularly when implements other than coring tubes are employed to carry out tests on the ground beïng bored. Such.tests ;nclude vane tests in which. an implement wi.th radially extending vanes is rotated in the soi.l and, the reaï.stance to rotation is measured and penetration tests in.whi.ch..the res.istance of the soil to penetration by an implement is measured. Obviously engagement of the leaves 32 wi.th.such..an implement or its supporting rods will upset the results of the tests ~eing carried out. A manner in which this problem can.be overcome is shown in Figures 6 and 7.
The test implement sh.own hy way of example in this case : .
is a vane test implement having a shaft 4Q and a soil penetrating ~:
head formed by radial vanes 42. It is coupled to the bottom of a .. :
string of screw-coupled drilling .rods 44. The lowermost rod 45 of the string of rods is equi.pped ~ith. at least one and typically two projecting keys:46 secured thereto by screws 48, and may be no more than a short coupling piece as shown. A projecting washer 50 is capti.ve between the shaft 4Q and the rod 45 so as to be engageable with a shoulder 52 on a collar 54 which normally surrounds the rod 45 beneath the keys 46. The collar 54 which ~ :
normally surrounds the rod 45 beneath -the keys 46. The collar 54 is formed internally with keyways 56 spaced similarly to the keys 46 so that when the rod 45 and the collar are correctly ;: ;
relatively oriented, the keys can pass through the keyways in : :
the collar so as to permit the rods 44 and 45 to move downwardly relative to the collar unti1 the keys leave the lower end of the keyways. The collar 54 supports a sleeve 58 whi.ch surrounds ths implement and may either be screwed onto the collar as shown, or, if of small wall thi.ckness., anchored thereto by set-screws 60.
In use/ the test implement is lowered down the stem of the auger by means of the rods 44 and 45, with the collar 54 resting on the washer 50. so as to support the sleeve 58. When the bottom of the sleeve reaches the spring leaves 32, further :
lowering of the rods causes the k.ey 46 to engage the top o~ the collar 54 and thus to force th.e sleeve ~etween the leaves 32.
When the sleeve has moved partly through the valves formed by the leaves so as to hold the latter apart, the rods 44 and 45 are rotated until the keys 46 drop into and through the keyways 56, whexea~ter the implement may be lowered further and manipulated as desired by means of the rods without interference from the spring leaves 32. When the rods are withdrawn from the auger stem, the shoulder 52 on the collar.is engaged by the keys 46 or the washer SQ and the sleeve 58 i.s also withdrawn.
It will be appreci.ated that the means used for releasably : .
coupling the sleeve to the string of rods or the test implement could be different from those descri~ed. For example remotely .`
controlled means could be provided for withdrawing the keys 46 into the rod 45 to release the collar, but an arrangement using complementary keys and keyways LS simple and can be actuated by simple rotation of the string of rods.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An auger bit for earth boring with a hollow stem auger, said bit having a cage structure formed by spaced concentric upper and lower rings, said upper ring forming a coupling to the remainder of the auger and said lower ring having a plurality of outward projections, side members extending parallel to the axis of the bit directly between said upper and lower rings radially outward of the inner diameters of the rings so as to define therebetween a cavity having spaced plane parallel side walls, and flight members extending helically between said rings externally of both said side members and said rings, cutting teeth releasably anchored in said outward projections from said lower ring, and a pair of valve members extending from said upper ring within said cage structure, said-valve members being spring urged to assume a cusp-like formation in which they co-act with the side walls to close the central orifice of said upper ring and being displaceable between said side walls to permit passage of a cylindrical member through and between the orifices in said upper and lower rings.
2. A hollow stem auger for earth boring including a bit having a cage structure formed by spaced concentric upper and lower rings, said upper ring forming a coupling to the remainder of the auger and said lower ring having a plurality of outward projections, side members extending parallel to the axis of the bit directly between said upper and lower rings radially outward of the inner diameters of the rings so as to define therebetween a cavity having spaced plane parallel side walls, and flight members extending helically said rings externally of both said side members and said rings, cutting teeth releasably anchored in said outward projections from said lower ring, a pair of valve members extending from said upper ring within said cage structure, said valve members being spring urged to assume a cusp-like formation in which they co-act with the side walls to close the central orifice of said upper ring, and a cylindrical member passable through said auger stem and through said bit between the orifices in the upper and lower rings so as to displace said valve members between said side walls.
3. An auger as claimed in Claim 2, wherein the cy-lindrical member is a coring tube.
4. An auger as claimed in Claim 2, wherein the cy-lindrical member comprises a cylindrical sleeve, a test implement housed within the sleeve and supported by a string of rods extending down the stem of the auger, and means releasably coupling the sleeve to the test implement and its supporting rods whereby the sleeve whilst so coupled is passable through said bit to displace said valve members, and when uncoupled permits actuation of said implment inde-pendently of said sleeve.
5. An auger as claimed in Claim 4, wherein the re-leasable coupling means comprises a coupling rod connecting the test implement to the remainder of the string of rods and a collar supporting the sleeve and normally surrounding the coupling rod, said coupling rod and collar having comple-mentary keys and keyways to permit or restrict relative axial movement of the sleeve and the implement according to their relative angular positions.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000359122A CA1134343A (en) | 1980-08-27 | 1980-08-27 | Earth boring auger |
| CA000394880A CA1139300A (en) | 1980-08-27 | 1982-01-25 | Earth boring auger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000359122A CA1134343A (en) | 1980-08-27 | 1980-08-27 | Earth boring auger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1134343A true CA1134343A (en) | 1982-10-26 |
Family
ID=4117751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000359122A Expired CA1134343A (en) | 1980-08-27 | 1980-08-27 | Earth boring auger |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1134343A (en) |
-
1980
- 1980-08-27 CA CA000359122A patent/CA1134343A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |