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Publication numberUS1342424 A
Publication typeGrant
Publication dateJun 8, 1920
Filing dateSep 6, 1918
Priority dateSep 6, 1918
Publication numberUS 1342424 A, US 1342424A, US-A-1342424, US1342424 A, US1342424A
InventorsCotten Shepard M
Original AssigneeCotten Shepard M
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method and apparatus for constructing concrete piles
US 1342424 A
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Description  (OCR text may contain errors)

S. M. COTTEN. METHOD AND APPARATUS FOR CONSTRUCTING CONCRETE PILES.

APPLICATION FILED SEPT. 6. 1.918.

1,342,424. 4 PatentedJune 8,1920.

2 SHEETS-SHEET l- A TTORNEYS WIT/V588." \1 i2 mo z 'a a.

' s. M. comm. 7 METHOD AND APPARATUS FOR CONSTRUCTING CONCRETE FILES. APPLICATION FILED SEPT.6, I918.-

1,342,4:24. Patented June 8, 1920.

2 SHEETS-SHEET 2- w/mss A I/WENTOR J. A? 12 6. Gaffe?! ATTORNEYS v SHEPARD 'M. COTTEN,' 0F PHOENIX, ARIZONA.

Specification of Letters Patent. I

Faten'ted June 8, 1924).

Application filed September 6, 1918. Serial No. 252,947.

To all whom it may concern:

Be it known that I, SHEPARD M. Corr'rnn, a citizen of the United States, and a resident of Phoenix, in the county of Maricopa and State of Arizona, have invented certain new and useful Improvements in Methods and Apparatus for Constructing Concrete Piles, of which the following is a specification.

My invention is a new and improved method and apparatus for constructing cast-in-place concrete piles. The main object of this invention is to provide a method of driving and casing the hole in the ground (into which the concrete-pile is cast) so as to develop a minimum of resistance to penetration upon the part of the material penetrated. This object is accomplished by the use of a casing, consisting of a series of telescoping cylindrical sections of suitable length, which are so designed,

related, and actuated that skin-friction between the casing and the ground penetrated is practically eliminated. At any time during the process of driving the hole, the maximum possible skin-friction which can exist, will be that developed by a single section, as at any time, only one section is both in motion and in contact with the material penetrated. The hole into which the casing is placed, is formed bydriving into the ground, a drive-shaft fitted with a pointed shoe or tip, this shaft being concentric with the casing, and actuating the movements of the casing sections. The arrangement is such that the drive-shaft may be easily removed to permit the cased hole to be filled with concrete. Also, provision is made such that the shoe may be locked to the driveshaft, and these, together with the casings, withdrawn.

In the drawings:

Figure 1 is a vertical section through the apparatus in position to drive the pile,

Fig. 2 is a view showing the casingdriven, the casing being shown in section, and the drive-shaft, collars, and shoe shown in elevation.

Fig. 3 is a section on the line 33 of Fig. 1, looking in the direction of the arrows adjacent to the line,

Fig. 4 is a sectional view through the driving cap, U

Fig. 5 is a top plan view of the same,

Fig. 6 is a vertical section of the interlocking nut of the drive-shaft,

7 is a top plan view of the same,

Flg. 8 is a partial side view of the shoe or tip, and A Fig. 9 is a top plan view of the same.

The apparatus embodied in this invention, as shown in the drawings, consists of the following 1. A drive-shaft 10, consisting preferably of a wrought-iron or steel pipe, in sections of convenient length. The couplings for these sections to consist of a threaded metal sleeve with a polygonal hole 11.

2. A shoe orv tip 9, with a conical or other sharp point, and with a cylindrical stem 14, of such diameter as to fit easily into the drive-shaft, which normall passes over this stem and rests upon the ase of the shoe. This shoe and stem may consist of metal, concrete, a combination of metal and concrete, or other suitable material. The diameter of the base of this shoe to be slightly larger than that of the outermost casing section, 1.

3. The cylindrical casing sections. These casings to consist of iron or steel plate, or other suitable material. The number of sections for any particular case depends upon the lengtli fixed for these and the depth of penetration required. The drawing shows six, 1 to 6 inclusive. At the top of each of these cylinders, except the outermost one, there is a lug 8, about the outer circumference, and at the bottom of each of them, except the inside one, there is a lug 7, about the inner circumference. The diameter to the outside of the lug 8, on any cylinder, is the same as the diameter to the inside of the lug 7 on the adjacent outside cylinder, and the diameters of these cylinders are such. as

- just to permit the free vertical movement of the cylinders with respect to each other, until the top lug of one comes into contact with the bottom lug of the adjacent outside one. The inside diameter of the innermost cylinder is such as to pass freely over the special fitting on the lower end of the driveshaft. These cylinders are of varying length, as shown, decreasing in regular amounts from the outside one to the inside. A collar 29, is attached to the-outer circumference of the outside cylinder. The cylinders may consist of solid late, or may have perf rations in them i required in special circumstances. 7 4-. The apparatus controlling the motion of the cylinders with respect to the drive- .shaft and shoe, consisting of the collars 21 to 26 inclusive; thebolts or bars 27 and the 'pins 28. The collars, except 26, consist of thick metal rings of constant inside diam-' idly connected to the drive-shaft, by means of screw threads or otherwise, and is so placed as to be in, or nearly in, contact with the top of the innermost cylinder when this rests upon the base of the shoe. This collar is so designed as to provide four suitable holes, at 90 with each other, and through these holes pass the bolts or bars 27, the head of the bolts being below the fitting. These bolts pass through holes provided in the collars. Holes are provided through the bolts just above the position fixed for the top of each collar, for the insertion of pins of a suitable diameter. The position of each collar, when the apparatus is assembled, is determined by the length of the corresponding section of casing, and the lengths of adjacent sections are made to differ by such an amount that there will be a clear space between consecutive collars, permitting the pins above each collar to be placed with ease. The pins are so designed as to be the weakest structural element of the apparatus. That is, the pins will fail in shear under a stress which is insufiicient todamage or distort-the bolt 27, the collars, or the. lugs about the casing sections, when these "latter are in position to limit the movement of one "section with respect to another.

5. Kttached by screw threads 13 to the .bottom f the'drive-shaft, there is a special metal fit ing 12 designed so as to distribute over a larger areathe percussion transmitted to the shoe by the drive-shaft under the impact of the pile-driving. hammer. This fitting 12 and the stem 14 of the shoe, are

so designed as to afford a means of locking the shoe to the drive-shaft, and withdrawing the same, together with the casing. The

. details of this design are shown in Fi s. 6,

7, 8, and 9. In Fig. *8 the maximum iameter of the stem is slightly smaller than the inside diameter of the drive-shaft. This diameter. is decreased over a section'of-the ting 12 is offset so as to provide a shoulder for the drive-shaft to rest upon, and the inside'diameter of this shoulder is equal to that of thesdriveshaft. The depth of this shoulder is made slightly less than the width of the circumferential groove around the stem 14, and on the inside surface there are provided four vertical ribs at 90 with re-- spect to each other the full depth of the shoulder, and of a radial height. equal to that of the depth of the grooves-16 and 19 on the stem 14. Y Consequently, when the ribs on thefitting 12 are turned to register lock the drive-shaft ,to the shoe, to permit withdrawing the latter, the drive-shaft is lifted slightly 'until the bottomof the fitting 12'is just above the top of the lower portion 18, Fig. 9, of the stem. A slight turn of the drive-shaft places the ribs 15 of the fitting 12 in the circumferential, groove on the stem 14, and out of. line with the vertical grooves 16. Any further lifting brings the top-of these ribs into contact with the top shoulder formed by the circumferential groove, and permits the shoe to be withdrawn.

In constructing a cast-in-place concrete pile by means of my invention, the method and the action of the apparatus is as follows The apparatus is first assembled upon the shoe in place in the manner shown in Fig. 1; the 'driving cap 30, Figs. 4 and 5, 1s placed' on the drive-shaft and in the leads of the'Ipile-driver. Thiscap 30 has an annular'groove 31 on its under face, for receiving the outer end of the driving shaft 10,

tion by the collar above it, this section (andv obviously, all of those inside it) 'follow down into the hole with the shoe, all the while resting upon the base of the shoe as shown inthe assembly, Fig. 1. The travel of the outermost section is stopped when the collar 29 comes into contact with the earth or other obstacle provided for the purpose, the resistanceoffered by the collar to further P'travel being sufficient to shear the pins 28 These pins being above the collar '21. sheared, the collar 21 comes to rest upon the top of section 1. The remainder of the collars and sections continue to follow the shoe as it penetrates, passing through the now stationary section 1, until such time as the lug 8 on section 2 comes into contact with lug 7 on section 1. The resistance offered by the lugs to further travel of section 2 is such as to shear the pins above the collar 22 and section 2 comes to rest .with collar 22 at rest upon its top. Section 3 then be comes the outside sectlon in motion, and the above described process is continued. until all the sections are extended and the desired penetration accomplished. It is to be observed that during the entire process of driving, the maximum surface developing skinfriction at any one time is that of one section of casing, since only one of these at a time is both in motion and exposed to the pressure of the penetrated material. Also,- since the hole immediately ahead of this section is of greater diameter than the easing, there will be very little resistance to the travel of this section. v i

The collars, as they come to rest upon the top of their respective sections, continue to perform important functions. They serve as a rigid guide and support for the 'drive' shaft, insuring the efliciency of this member in transmitting the blow of the hammer to the shoe, and insure the correct alinement of the hole. They also serve as supports and reinforcement for the casing sections against the pressure exerted b the penetrated material, during the perio of driving, when this is most needed. They ma also continue in this capacity during the lling of the hole with concrete, as hereinafter mentioned.

Generally, it is desired to leave the casings in the ground, and these may be considered as adequate to resist the pressures against them without the reinforcement afforded by the collars, during the interval between the removal of the collars and the filling of the hole with concrete. In this case, the desired penetration having been accomplished, the

drive-shaftis lifted out, bringing up with'it the collars, which are picked up in order by the fixed collar'26, beginning at the bottom. The hole is then filled with concrete, or other material suitable for the purpose.

I; the material penetrated is such that there would be danger of the collapse of the casing upon the removal of the reinforcing collars, the driving cap may be released and as many sections of the driving shaft as convenient, may' be removed, and concrete poured down the hollow driving shaft, withdrawing this and the collars as the concrete rises in the hole. I

When, for any reason, at any period of driving, it is desired to withdraw the shoe and the cylinders, this may be done by locking the drive-shaft to the shoe, as previously described, and withdrawing the drive-shaft.

The shoe being-of greater diameter than an of the casing cylinders, and concentric wit of the hole and the outside of the casing sections, these sectionsshall be perforated in such manner as to permit the concrete, when poured into the casin to flow out in such quantity as to fill said annular space.

Should the resistance of the penetrated material to the travel of any sections be such' as to shear the pins 27 before said sections have traveled their allotted distance, they will ultimately be extended in full, if the shoe is driven to such depth as would normally accomplish this. The innermost section must travel with the shoe, because of the collar above it (26) being rigidly attached to the drive-shaft. As this section descends, if there are any intermediate sections which are not fully extended, they will be forced into their proper position by virtue of the pull exerted upon their lugs, said pull being primarily transmitted by the upper lug of the innermost section.

I claim 2- 1. A device of the character specified, comprising a drive-shaft, a pointed shoe, a series of interlocking, telescopic, cylindrical casing sections of varying diameter, ar-

ranged one within the other around the drive-shaft and normally resting upon the base of the shoe, a series of collars of varying outside diameter passing over the drive: shaft and resting along their outer edges upon the tops of the respective sections, and a frangible connection between the driveshaft and each of the collars.

2. A device of the character specified, comprising a drive shaft, a series ofinterlocking telescopic casing. sections of varying diameter arrangedone within the other around the drive shaft, a, collar for each section passing over the drive shaft and engaging the adjacent section, and a frangible connection between the drive shaft and each of the collars, and a driving shoe detachably connected with the lower end of the shaft upon whose upper surfaces the sec- 1 tions rest during driving.

3. A device of the character specified, 120.

ing shaft for constraining the section to move with the drive shaft and a frangible connection between the drive shaft and each of the sections and adapted to break under the application of a predetermined degree of force,'and a driving shoe upon whose upper surface the upper sections rest during driving.

5. In a device of the character specified, a series of casing sections arranged 'one within the other, a driving shaft, the driving shaft for constraining the section to move with the drive shaft and a frangible connection between the each of the sections and adapted to break under the application of a predetermined degree of force.

6. In a device of the character specified, a series of casing sections arranged one within the'other, a driving shaft, a frangible connection between the drive shaft and each of the sections, said connection being adapted to yield on the application of a. predetermined degree of force for the purpose specified, a driving shoe at the lower end of the driving shaft upon which the lower ends of the section rest, and a detach-' able connection between the shoe and the sllliafft releasable at the upper end of the s a t.

7. A device of the character specified cornprising a drive shaft and a series of interlocking telescoping sections, a rigid connection between the drive shaft and themnermost section for constraining the; section to move with the driving shaft,'and a frangible connection betweenthe driving shaft and the remainin sections forconstraining them to move withthe driving shaft and drive shaft andadapted to break under a predetermined force to release the sections in succession.

8. A deviceof the character specified comprising a driving shaft and a series of interlocking telescoping sections, a rigid connection between the driving shaft and the innermost section for constraining the section to move with the driving shaft, and a frangible connection between the driving shaft and the remaining sections for constraining them to move with the driving shaft and adapted to break under a predetermined force to release the sections in succession, said first named connection comprising a collar rigid with the shaft and engaging over the top of the innermost section.

9. A device of the character specified comprising a driving shaft and a series of interlocking telescoping sections, a rigid connection between the drive shaft and the innermost section for constraining the section to move with the driving shaft, and a frangible connection between the. driving shaft and the remaining sections for constrainin them to move the driving shaft and adapte to break under a predetermined force to release the sections in succession, said first named connection comprising a collar rigid with the shaft and engaging over the top of the innermost section, the frangible connection comprising a series of collars, each extending outwardly'to engage ,a section,

rods extending from the first named collar through the other collars and pins extending transversely of the rods above the collars. I SHEPARD M. COTTEN. Witnesses: I

w. BANUMA, B. M. A'rwoon.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2693087 *Feb 5, 1952Nov 2, 1954Quillinan Michael JPile
US3091090 *Dec 21, 1959May 28, 1963Ludwig MullerPile shaft
US3178893 *Jan 23, 1961Apr 20, 1965Foundation Specialties IncPile and pile driving apparatus
US3194022 *Apr 21, 1961Jul 13, 1965Dougherty John JPile shell boot and mandrel plug point assembly
US3624760 *Nov 3, 1969Nov 30, 1971Bodine Albert GSonic apparatus for installing a pile jacket, casing member or the like in an earthen formation
US4190383 *Jan 11, 1978Feb 26, 1980Pynford LimitedStructural element
US6857487 *Dec 30, 2002Feb 22, 2005Weatherford/Lamb, Inc.Drilling with concentric strings of casing
US6896075Oct 11, 2002May 24, 2005Weatherford/Lamb, Inc.Apparatus and methods for drilling with casing
US6899186Dec 13, 2002May 31, 2005Weatherford/Lamb, Inc.Apparatus and method of drilling with casing
US6953096Dec 31, 2002Oct 11, 2005Weatherford/Lamb, Inc.Expandable bit with secondary release device
US6994176Mar 5, 2004Feb 7, 2006Weatherford/Lamb, Inc.Adjustable rotating guides for spider or elevator
US7004264Mar 14, 2003Feb 28, 2006Weatherford/Lamb, Inc.Bore lining and drilling
US7013997Dec 15, 2003Mar 21, 2006Weatherford/Lamb, Inc.Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7036610Jul 6, 2002May 2, 2006Weatherford / Lamb, Inc.Apparatus and method for completing oil and gas wells
US7040420Nov 19, 2003May 9, 2006Weatherford/Lamb, Inc.Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7048050Oct 2, 2003May 23, 2006Weatherford/Lamb, Inc.Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7073598Jul 23, 2003Jul 11, 2006Weatherford/Lamb, Inc.Apparatus and methods for tubular makeup interlock
US7083005May 31, 2005Aug 1, 2006Weatherford/Lamb, Inc.Apparatus and method of drilling with casing
US7090021Mar 16, 2004Aug 15, 2006Bernd-Georg PietrasApparatus for connecting tublars using a top drive
US7090023May 9, 2005Aug 15, 2006Weatherford/Lamb, Inc.Apparatus and methods for drilling with casing
US7093675Aug 1, 2001Aug 22, 2006Weatherford/Lamb, Inc.Drilling method
US7096982Feb 27, 2004Aug 29, 2006Weatherford/Lamb, Inc.Drill shoe
US7100710Dec 18, 2003Sep 5, 2006Weatherford/Lamb, Inc.Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7100713Apr 2, 2001Sep 5, 2006Weatherford/Lamb, Inc.Expandable apparatus for drift and reaming borehole
US7108084Dec 24, 2003Sep 19, 2006Weatherford/Lamb, Inc.Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7117957May 25, 2004Oct 10, 2006Weatherford/Lamb, Inc.Methods for drilling and lining a wellbore
US7128154Jan 29, 2004Oct 31, 2006Weatherford/Lamb, Inc.Single-direction cementing plug
US7128161Sep 20, 2005Oct 31, 2006Weatherford/Lamb, Inc.Apparatus and methods for facilitating the connection of tubulars using a top drive
US7131505 *Feb 22, 2005Nov 7, 2006Weatherford/Lamb, Inc.Drilling with concentric strings of casing
US7137454May 13, 2005Nov 21, 2006Weatherford/Lamb, Inc.Apparatus for facilitating the connection of tubulars using a top drive
US7140445Mar 5, 2004Nov 28, 2006Weatherford/Lamb, Inc.Method and apparatus for drilling with casing
US7147068Dec 5, 2003Dec 12, 2006Weatherford / Lamb, Inc.Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7165634Oct 2, 2003Jan 23, 2007Weatherford/Lamb, Inc.Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7188687Jul 27, 2004Mar 13, 2007Weatherford/Lamb, Inc.Downhole filter
US7191840Mar 5, 2004Mar 20, 2007Weatherford/Lamb, Inc.Casing running and drilling system
US7213656Apr 26, 2004May 8, 2007Weatherford/Lamb, Inc.Apparatus and method for facilitating the connection of tubulars using a top drive
US7216727Dec 21, 2000May 15, 2007Weatherford/Lamb, Inc.Drilling bit for drilling while running casing
US7219744Nov 29, 2005May 22, 2007Weatherford/Lamb, Inc.Method and apparatus for connecting tubulars using a top drive
US7228901Dec 1, 2005Jun 12, 2007Weatherford/Lamb, Inc.Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7234542Feb 9, 2006Jun 26, 2007Weatherford/Lamb, Inc.Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7264067Oct 1, 2004Sep 4, 2007Weatherford/Lamb, Inc.Method of drilling and completing multiple wellbores inside a single caisson
US7284617May 20, 2004Oct 23, 2007Weatherford/Lamb, Inc.Casing running head
US7303022Apr 27, 2004Dec 4, 2007Weatherford/Lamb, Inc.Wired casing
US7311148Feb 9, 2004Dec 25, 2007Weatherford/Lamb, Inc.Methods and apparatus for wellbore construction and completion
US7325610Mar 5, 2004Feb 5, 2008Weatherford/Lamb, Inc.Methods and apparatus for handling and drilling with tubulars or casing
US7334650Feb 2, 2004Feb 26, 2008Weatherford/Lamb, Inc.Apparatus and methods for drilling a wellbore using casing
US7360594Mar 5, 2004Apr 22, 2008Weatherford/Lamb, Inc.Drilling with casing latch
US7370707Apr 5, 2004May 13, 2008Weatherford/Lamb, Inc.Method and apparatus for handling wellbore tubulars
US7395882Feb 19, 2004Jul 8, 2008Baker Hughes IncorporatedCasing and liner drilling bits
US7413020Mar 5, 2004Aug 19, 2008Weatherford/Lamb, Inc.Full bore lined wellbores
US7503397Jul 29, 2005Mar 17, 2009Weatherford/Lamb, Inc.Apparatus and methods of setting and retrieving casing with drilling latch and bottom hole assembly
US7509722Mar 5, 2003Mar 31, 2009Weatherford/Lamb, Inc.Positioning and spinning device
US7617866Sep 8, 2005Nov 17, 2009Weatherford/Lamb, Inc.Methods and apparatus for connecting tubulars using a top drive
US7621351May 11, 2007Nov 24, 2009Baker Hughes IncorporatedReaming tool suitable for running on casing or liner
US7624818Sep 23, 2005Dec 1, 2009Baker Hughes IncorporatedEarth boring drill bits with casing component drill out capability and methods of use
US7650944Jul 11, 2003Jan 26, 2010Weatherford/Lamb, Inc.Vessel for well intervention
US7712523Mar 14, 2003May 11, 2010Weatherford/Lamb, Inc.Top drive casing system
US7730965Jan 30, 2006Jun 8, 2010Weatherford/Lamb, Inc.Retractable joint and cementing shoe for use in completing a wellbore
US7748475Oct 30, 2007Jul 6, 2010Baker Hughes IncorporatedEarth boring drill bits with casing component drill out capability and methods of use
US7757784Jun 24, 2005Jul 20, 2010Baker Hughes IncorporatedDrilling methods utilizing independently deployable multiple tubular strings
US7857052May 11, 2007Dec 28, 2010Weatherford/Lamb, Inc.Stage cementing methods used in casing while drilling
US7857078Apr 24, 2008Dec 28, 2010Baker Hughes IncorporatedCutting tools and methods of making the same
US7900703Nov 23, 2009Mar 8, 2011Baker Hughes IncorporatedMethod of drilling out a reaming tool
US7938201Feb 28, 2006May 10, 2011Weatherford/Lamb, Inc.Deep water drilling with casing
US7954570Sep 20, 2006Jun 7, 2011Baker Hughes IncorporatedCutting elements configured for casing component drillout and earth boring drill bits including same
US7954571Feb 12, 2008Jun 7, 2011Baker Hughes IncorporatedCutting structures for casing component drillout and earth-boring drill bits including same
US8006785May 29, 2008Aug 30, 2011Baker Hughes IncorporatedCasing and liner drilling bits and reamers
US8167059Jul 7, 2011May 1, 2012Baker Hughes IncorporatedCasing and liner drilling shoes having spiral blade configurations, and related methods
US8177001Apr 27, 2011May 15, 2012Baker Hughes IncorporatedEarth-boring tools including abrasive cutting structures and related methods
US8191654May 2, 2011Jun 5, 2012Baker Hughes IncorporatedMethods of drilling using differing types of cutting elements
US8205693Jul 7, 2011Jun 26, 2012Baker Hughes IncorporatedCasing and liner drilling shoes having selected profile geometries, and related methods
US8225887Jul 7, 2011Jul 24, 2012Baker Hughes IncorporatedCasing and liner drilling shoes with portions configured to fail responsive to pressure, and related methods
US8225888Jul 7, 2011Jul 24, 2012Baker Hughes IncorporatedCasing shoes having drillable and non-drillable cutting elements in different regions and related methods
US8245797Oct 23, 2009Aug 21, 2012Baker Hughes IncorporatedCutting structures for casing component drillout and earth-boring drill bits including same
US8276689May 18, 2007Oct 2, 2012Weatherford/Lamb, Inc.Methods and apparatus for drilling with casing
US8297380Jul 7, 2011Oct 30, 2012Baker Hughes IncorporatedCasing and liner drilling shoes having integrated operational components, and related methods
USRE42877Jul 9, 2010Nov 1, 2011Weatherford/Lamb, Inc.Methods and apparatus for wellbore construction and completion
Classifications
U.S. Classification405/253, 175/171, 405/257, 175/19
International ClassificationE02D5/00, E02D5/22, E02D5/52, E02D5/66, E02D7/30, E02D7/00
Cooperative ClassificationE02D5/665, E02D7/30, E02D5/52
European ClassificationE02D5/52, E02D5/66B, E02D7/30