GB1592202A - Creación de Inventos y Patentes con Inteligencia Artificial

GB1592202A – Tooth for rotary drilling tool for drilling foundations
– Google Patents

GB1592202A – Tooth for rotary drilling tool for drilling foundations
– Google Patents
Tooth for rotary drilling tool for drilling foundations

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Publication number
GB1592202A

GB1592202A
GB43442/77A
GB4344277A
GB1592202A
GB 1592202 A
GB1592202 A
GB 1592202A
GB 43442/77 A
GB43442/77 A
GB 43442/77A
GB 4344277 A
GB4344277 A
GB 4344277A
GB 1592202 A
GB1592202 A
GB 1592202A
Authority
GB
United Kingdom
Prior art keywords
tooth
drilling tool
thickened
rotary drilling
cutting edge
Prior art date
1977-02-03
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

Application number
GB43442/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

BOURLIER J

Original Assignee
BOURLIER J
Priority date (The priority date 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 date listed.)
1977-02-03
Filing date
1977-10-19
Publication date
1981-07-01

1977-10-19
Application filed by BOURLIER J
filed
Critical
BOURLIER J

1981-07-01
Publication of GB1592202A
publication
Critical
patent/GB1592202A/en

Status
Expired
legal-status
Critical
Current

Links

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Classifications

E—FIXED CONSTRUCTIONS

E21—EARTH DRILLING; MINING

E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

E21B10/00—Drill bits

E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts

E21B10/56—Button-type inserts

E—FIXED CONSTRUCTIONS

E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING

E02F—DREDGING; SOIL-SHIFTING

E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 – E02F7/00

E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits

E02F9/2808—Teeth

E02F9/285—Teeth characterised by the material used

E—FIXED CONSTRUCTIONS

E21—EARTH DRILLING; MINING

E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

E21B10/00—Drill bits

E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts

E—FIXED CONSTRUCTIONS

E21—EARTH DRILLING; MINING

E21C—MINING OR QUARRYING

E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 – E21C33/00, E21C37/00 or E21C39/00

E21C35/18—Mining picks; Holders therefor

E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material

E—FIXED CONSTRUCTIONS

E21—EARTH DRILLING; MINING

E21C—MINING OR QUARRYING

E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 – E21C33/00, E21C37/00 or E21C39/00

E21C35/18—Mining picks; Holders therefor

E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material

E21C35/1833—Multiple inserts

Description

PATENT SPECIFICATION
( 21) Application No 43442/77 ( 22) Filed 19 Oct 1977 ( 31) Convention Application No 7703052 ( 32) Filed 3 ( 33) France (FR) ( 44) Complete Specification Published 1 Jul 1981 ( 11) 1 592 202 ( 19) Feb 1977 in ( 51) INT CL 3 E 21 B 10/44 E 02 F 9/28 ( 52) Index at Acceptance E 1 F FM B 8 H QF ( 54) TOOTH FOR ROTARY DRILLING TOOL FOR DRILLING FOUNDATIONS ( 71) I, JACQUES BOURLIER of 2, rue Felix Faure 75015 Paris, France, a citizen of France, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly de-
scribed in and by the following statement:
The present invention relates to earth drilling tools for drilling foundations and especially to teeth for drilling heads of rotary drilling tools such as earth auger drills or rotary buckets.
An earth auger drill comprises generally a tubular structure forming a shaft around which are formed flights for discharging drilled materials in the shape of an endless or Archimedes screw, the lower portion of these flights forming a cutting edge, including a substantially radial drilling head and provided with a plurality of receiving members for removably receiving contoured teeth.
These receiving members, or tooth carriers, are generally provided at their front end with a recess into which the retaining base of a tooth is inserted In a widely used embodiment, the recess in the tool carrier is formed by a longitudinal groove divided into two side portions by a transverse partition positioned centrally The corresponding retaining bases of the teeth have thus a U shape in order to be received in the groove and to be maintained transversely therein by the partition of the tooth carrier.
The tooth is introduced into the groove, said groove being provided with an elastic coating to prevent inadvertant withdrawal of the tooth.
The working portion of the tooth, or working blade, has generally a tapered longitudinal section, the edge angle and the length of the blade being adapted to the hardness of the soil to be drilled and to the rotational speed of the drilling tool.
This type of tooth presents a certain number of drawbacks when hard soils and especially rocky soils have to be drilled.
On the one hand, the shape of the working portion of the tooth, or tooth blade is not suitable for drilling rocky soils: its mechanical resistance is relatively low and its tapered section, that is its portion which is getting more slender towards the cutting area, does not permit the insertion therein of tungsten carbide tips which are necessary for proper drilling in such conditions On the other hand, the retaining arrangement of the tooth base does not permit a perfectly secure retention of the tooth due to the lateral vibrations induced during drilling so that the tooth may be withdrawn inadvertantly.
Special teeth have been proposed in order to permit the insertion of tungsten carbide tips therein In this type of tooth, the tapered portion of the blade is limited to a short chamfer at the cutting edge of the tooth, the thickness of the blade body being substantially the same as that of the tooth base This type of tooth presents a double drawback: it does not offer a cutting profile suitable for good penetration and it increases the overhanging weight of the blade, thus promoting tooth judder and escape of the tooth from the tooth carrier.
It is an object of the present invention to eliminate the drawbacks of the teeth of the prior art in providing a tooth which permits working in rocky soils with maximum efficiency and with considerably reduced risks of teeth escape from the tooth carrier.
It is another object of the present invention to provide a tooth for a rotary drilling tool which has a suitable profile while permitting the insertion of tungsten carbide tips.
It is another object of the present invention to provide such a tooth adaptable onto a conventional tooth carrier, said tooth being light in weight and having a base 0 r m} 1 592 202 provided with means to ensure a proper retention in the tooth carrier.
The present invention provides a tooth for a rotary drilling tool, especially for an earth tool, for use in drilling in rocky soils, said tooth including a contoured working portion defining a cutting edge and a retaining portion having a U-shaped configuration defining two substantially planar surfaces for mounting said tooth in a tooth carrier formed with a tooth receiving groove, a central partition and external side faces, wherein said working portion of said tooth is formed with a web having two longitudinal edges, at least one of said longitudinal edges being thickened and extending along said working portion up to said cutting edge of said tooth, the thickness of said web of said tooth working portion being, in transverse section, smaller than that of said thickened edge, said thickened edge protruding in transverse cross-section on both sides of said web and having a free end of a thickness sufficient to receive a tip made from hard material, the longitudinal contour of said web being substantially bevelled.
According to another feature of the present invention, a transverse shoulder is provided to extend at the junction at least between one of the plane faces of the retaining base of the tooth and the rear end of the working portion which adjoins the retaining base.
Such a configuration of the tooth enables the provision of a working blade with a suitable profile, relatively light in weight while being substantially rigid, the cutting edge transverse section having a thickness and a mechanical resistance sufficient to permit suitable insertion and durable retention of at least one tungsten carbide tip, thus permitting a considerable increase in the efficiency of such a tooth when drilling in rocky soils.
A transverse rib may be provided in the working action at the junction with the retaining portion to provide a locally increased thickness ensuring increased rigidity at the junction between the working blade and the retaining base thus permitting the formation of at the end of one of the planar surfaces which define longitudinally the U-shaped retaining base thus permitting the formation of at the end of one of the planar surfaces which define longitudinally the U-shaped retaining base, a transverse shoulder acting as a stop which cooperates with the front face of the tooth carrier, resulting in an improved contact between the tooth and the tooth carrier and reducing therefore considerably the risks of tooth escape.
The thickened configuration of the longitudinal edges of the working blade further permits, without reducing the mechanical resistance of the tooth, the giving of a curved shape to the working blade lateral profile which is of considerable interest for the outer tooth of an earth auger drill It has been realized that on the outer tooth of the earth auger drill, due to the rotary motion of the drill, a differential wear was occuring along the cutting edge, the outermost part of the edge forming substantially a wedge relative to the tangent to the earth drill, said part of the edge being worked much more severely than the inner part of this same cutting edge, resulting after a short use in considerable wear, this wear being occasionally such as this external wedge disappears completely.
A thickened external edge according to the present invention has an increased mechanical resistance compared with the conventional teeth, and the possibility of inserting a tungsten carbide tip provides an increased cutting efficiency and a reduced wear rate Moreover, with such a thickened edge, the outer edge can have substantially the shape of an arc of a circle, making thus possible to make it match more exactly the circle of rotation of an earth auger drill and permitting, by making the opposed thickened edge slightly shorter, to have the cutting edge slanted relative to the soil and substantially facing the soil to be drilled during work rather than working obliquely to it as is generally the case with teeth having a cutting edge perpendicular to their general longitudinal direction.
It is therefore another object of the present invention to provide a tooth of the general type described hereabove, one of the thickened edges of the working portion of which having in front view a curved profile, the convex side facing the outside of the tooth, the width of the cutting edge of the working portion being larger than the width of the retaining portion or base of the tooth, the overall length of the tooth being larger on the side of the curved thickened edge than that on the side of the opposite thickened edge in order to provide a slanted cutting edge relative to the general transverse direction of the tooth, that is the general radial direction of the working head.
As an alternative, to still improve the retention of the tooth in the tooth carrier, and according to another feature of the present invention, the width of the retaining base of the tooth is larger than the width of the tooth retaining jaw of the tooth carrier, at least one of the planar surfaces defining the U-shaped portion of the tooth base extending to the outer edges of the tooth base through longitudinal shoulders designed to cooperate with the lateral external surfaces of the tooth carrier.
Other objects and advantages of the present invention will become apparent 1 592 202 from the following detailed description taken in connection with the accompanying drawings wherein are setforth by way of illustration and example certain embodiments of the present invention.
In the drawings:Figure 1 is a front view of an embodiment of a tooth according to the present invention; Figure 2 is a section view taken along the line II II of the tooth shown in Figure 1; Figure 3 is a section view taken along the line III III of the tooth shown in Figure 1; Figure 4 is a front view of another embodiment of a tooth according to the present invention, especially adapted to be used as an end or outer tooth; and.
Figure 5 is a section view taken along the line V V of the tooth shown in Figure 4.
On these drawings and in the following description, identical elements or component parts are given the same reference numbers.
Referring to Figure 1, an embodiment of a tooth of the present invention is shown, this tooth including, as is conventional, two distinct portions, one working portion or blade, indicated generally by numeral 1, and a retaining portion or base, indicated generally by numeral 2 The tooth shown on Figure 1 has a retaining base designed to be introduced into a tooth carrier formed with grooves and a central partition, such as the device known under the Registered Trade Marl «Pengo» This base 2 has a substantially parallelepipedic outer configuration defined particularly by longitudinal parallel planar surfaces 3 and 3 which correspond substantially to the height of the groove of the tooth carrier a central opening 4 defining a U-shape in said base in order to cooperate with the central partition of the tooth carrier.
The working portion or blade 1 is defined laterally by two planar surfaces 5 which are an extension of the lateral faces of the base 2, and at its free end by a cutting edge 6 substantially perpendicular to the side surfaces 5 The blade 1 is provided, according to the present invention, with two thickened side edges 7 which define ridges and with a central web 8 connecting these two thickened side edges 7 As can be better seen on Figure 3, the web 8 is relatively thin and merges smoothly into the thickened side edges 7 which form the side edges of the blade.
As can be better seen on Figure 2, in side view, the opposed faces of the thickened edges 7 lie in planes forming a dihedron which ends into a blade Junction portion 9 substantially thicker than the tooth base 2.
As can be seen on Figure 2, the web 8 has also, in section, a generally bevelled or tapered shape tapering towards the cutting edge The junction portion 9 of the blade is formed with transverse rib 10 forming the junction between the cutting blade 1 and the tooth base 2, said transverse rib merging smoothly into the thickened side edges in order to enhance the rigidity and the mechanical resistance of this area of the tooth which is submitted to maximum stresses during drilling, e g compression stresses plus shearing stresses due to the tooth base insertion into the tooth carrier.
The junction between said transverse rib and the longitudinal plane 3 of the tooth base 2 forms a transverse shoulder 11 designed to engage with the front outer face of the tooth carrier when the tooth is inserted into the tooth carrier, thus increasing the contact area between the tooth and the tooth carrier and limiting the possibility of lateral motion and judder of the tooth during drilling, hence reducing considerably the risks of tooth escape from the tooth carrier.
As can be seen on Figures 2 and 3, the tooth of the present invention, while being of a slender nature and having a contour most suitable for cutting operation, presents at its cutting edge, in the area of the thickened edges, an enlarged section sufficient to permit the insertion according to conventional methods, of hard material tips, for example of case hardened steel or tungsten carbide, tips indicated by numeral 12, in order to improve the cutting efficiency and to reduce the wear of the teeth when drilling in rocky soils.
Referring to Figures 4 and 5, there is shown another embodiment of a tooth according to the present invention, especially adapted to be used as the end or outer tooth of a series of teeth installed on a leading edge of a rotary earth drilling tool.
In providing the thickened side edges of the tooth of the present invention, it is possible, in this embodiment, to give a curved shape to the lateral contour of the tooth which flares slightly from the junction area 9 to the cutting edge 16 The thickened edge 17 has a curved external contour 15 the curvature of which corresponds substantially to the circular movement of the earth auger drill and being adapted to its radius, the width reduction of the blade 1 from the cutting edge to the base 2 permitting the disengagement of the tool from the rocky soils.
According to a feature of the present invention, the thickened edge 17 is longer than the opposite thickened edge 7 in order to form a curvilinear cutting edge 16 which is slanted, especially at the cutting edge of the thickened edge 17, relatively to the general radial direction of the leading edge of the tool, that is the direction defined by the transverse shoulder 11, so that this slanted cutting edge may face the soil during 1 592 202 work rather than being positioned obliquely to the soil as is the case generally, at least for the outermost tooth, with teeth having a rectangular blade contour of the type shown in Figures 1 to 3 Obviously, according to the present invention, the portion of the cutting edge defined at the front end of the curved thickened edge 17 is provided with a tungsten carbide tip 12 similar to the opposite thickened edge 7 of said blade 1.
An outer tooth, as shown on Figures 4 and 5, being subjected to more severe conditions during work than the other teeth of the drill is provided according to one feature of the present invention with two transverse shoulders 11 and 11 ‘ the two faces of the web 8 extending into two transverse ribs 10 and 10 ‘ In this embodiment, as shown on Figure 5 the overall thickness of the tooth corresponding to the thickness of the thickened side edges is constant from the cutting edge 16 up to the end of the U-shaped tooth base, that is to say that the thickened edges 7 and 17 extend longitudinally up to the free end of said tooth base 2 In order to permit the installation of this tooth into a tooth carrier of the type disclosed above and to further improve its retention into this tooth carrier, in addition to the transverse shoulders 11 and 11 ‘, there are provided longitudinal shoulders 14 which connect the planar surfaces 3 and 3 ‘ of said tooth base 2 with the extensions 7 ‘ and 17 ‘ of said thickened edges 7 and 17, these shoulders being designed to cooperate with the outer side faces of the tooth carrier thereby ensuring an improved retention of the tooth in the tooth carrier.

Claims (9)

WHAT I CLAIM IS:-

1 A tooth for a rotary drilling tool, especially for an earth tool, for use in drilling in rocky soils, said tooth including a contoured working portion defining a cutting edge and a retaining portion having a U-shaped configuration defining two substantially planar surfaces for mounting said tooth in a tooth carrier formed with a tooth-receiving groove, a central partition and external side faces, wherein said working portion of said tooth is formed with a web having two longitudinal edges, at least one of said longitudinal edges being thickened and extending along said working portion up to said cutting edge of said tooth, the thickness of said web of said tooth working portion being, in transverse section, smaller than that of said thickened edge, said thickened edge protruding in transverse cross-section on both sides of said web and having a free end of a thickness sufficient to receive a tip made from hard material, the longitudinal contour of said web being substantially bevelled.

2 A tooth for a rotary drilling tool according to claim 1, wherein said two longitudinal edges are thickened and merge smoothly into a transverse rib formed in the working portion at the junction areas between said working portion and said retaining portion of the tooth, the web portion opposite to said cutting edge of said tooth merging smoothly into said transverse rib.

3 A tooth for a rotary drilling tool according to claim 2, wherein the junction of said transverse rib and at least one planar surface of said U-shaped retaining portion of said tooth forms a transverse shoulder oriented towards the opening of the U.

4 A tooth for a rotary drilling tool according to claim 3, wherein said longitudinal edges extend up to the end of said retaining portion opposite to said cutting edge of said tooth, the width of said retaining portion being larger than that of said tooth carrier, in the groove direction of said carrier, said at least planar surface which joins said transverse rib through a shoulder further joining extensions of said longitudinal edges through longitudinal shoulders designed to cooperate with said external side faces of said tooth carrier.

A tooth for a rotary drilling tool according to any of the claims 1 to 4 wherein said longitudinal edges are externally defined by planar side surfaces.

6 A tooth for a rotary drilling tool according to any of the claims 1 to 4, especially designed to be used as the outer tooth of a series of radially disposed teeth of an earth auger drill, wherein one of said thickened edges of said working portion of the tooth has, in front view, a curved contour, the convex side being oriented towards the outside of said tooth, the width of said cutting edge of said working portion of said tooth being larger than that of said retaining portion, the overall length of said curved thickened edge being larger than the length of the opposite thickened edge in order to provide said tooth with a slanted cutting edge relative to the general transverse direction of said tooth.

7 A tooth for a rotary drilling tool, according to claim 6, wherein said cutting edge of the tooth has a curvilinear irregular contour, the slanting angle of which relative to said transverse direction of said tooth being larger at said curved thickened edge.

8 A tooth for a rotary drilling tool according to any of claims 1 to 7, when provided with a said hard material tip, the tip being made from tungsten carbide.

9 A rotary drilling tool, especially an earth auger drill, including at least one tooth carrier fitted with at least one tooth according to any of the claims 1 to 8.
1 592 202 5 A tooth for a rotary drilling tool substantially as herein disclosed with reference to the appended drawings.
ERIC, POTTER & CLARKSON, Market Way, Broad Street, Reading RG 1 2 BN.
Agents for the Applicant.
Printed for Her Majesty’s Stationery Office, by Croydon Printing Company Limited, Croydon, Surrey, 1981.
Published by The Patent Office, 25 Southampton Buildings, London, WC 2 A LAY, from which copies may be obtained.

GB43442/77A
1977-02-03
1977-10-19
Tooth for rotary drilling tool for drilling foundations

Expired

GB1592202A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

FR7703052A

FR2379695A1
(en)

1977-02-03
1977-02-03

TEETH FOR FOUNDATION DRILLING TOOL WITH ROTARY MOVEMENT

Publications (1)

Publication Number
Publication Date

GB1592202A
true

GB1592202A
(en)

1981-07-01

Family
ID=9186263
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB43442/77A
Expired

GB1592202A
(en)

1977-02-03
1977-10-19
Tooth for rotary drilling tool for drilling foundations

Country Status (9)

Country
Link

US
(1)

US4170267A
(en)

BE
(1)

BE859803A
(en)

DE
(1)

DE2803498A1
(en)

ES
(1)

ES240233Y
(en)

FR
(1)

FR2379695A1
(en)

GB
(1)

GB1592202A
(en)

IT
(1)

IT1090919B
(en)

LU
(1)

LU78965A1
(en)

NL
(1)

NL7801095A
(en)

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

GB2510433A
(en)

2013-02-05
2014-08-06
Attachment Torque Mfg China Co Ltd
Curved auger tooth and auger tooth holder

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Priority date
Publication date
Assignee
Title

DE3136077C1
(en)

1981-09-11
1982-10-28
Berchem & Schaberg Gmbh, 4650 Gelsenkirchen

Rock cutting head for suction excavators or the like.

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1986-11-04
1988-11-15
Limbco, Inc.
Stump remover

US5253385A
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1989-09-14
1993-10-19
Shizuo Sagawa
Pipeline pig sweeper and sweeper pin

US5111600A
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1991-07-30
1992-05-12
Caterpillar Inc.
Tooth with hard material applied to selected surfaces

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(en)

2002-07-01
2004-01-05
Pennsylvania Crusher Corporation
Excavator teeth, apparatus and method

GB0318995D0
(en)

2003-08-13
2003-09-17
Digga Europ Ltd
Improvements in or relating to an excavating tooth assembly

PL1507061T3
(en)

2003-08-13
2008-02-29
Auger Torque Europe Ltd
Improvements in and relating to a releasable auger tooth

US20080216365A1
(en)

2007-03-07
2008-09-11
Pengo Corporation
Excavating tooth assembly and method for assembling and using the same

US20170044741A1
(en)

2015-08-10
2017-02-16
James Elton Robbins
Excavation System

JP6628459B1
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2019-05-21
2020-01-08
金属工具株式会社

Auger bit

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John W Kittredge
Tooth construction for digging-buckets

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Ero J Palo
Tool joint

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1967-01-31
Petersen
Reversible digging tooth with three cutting edges

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1966-11-22
Petersen Gerald A
Webbed prong-type tooth with resilient retaining means

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Petersen Gerald A
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Gerald A Petersen
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1968-11-28
Austin Hoy And Company Ltd Sta

Interchangeable chisels with chisel holder and with feeds for liquid

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Excavating tooth having outwardly slanted ribs

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Kennametal Inc
Excavating tool arrangement

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Adco Buckets, Inc.
Excavating bucket and teeth for a backhoe

1977

1977-02-03
FR
FR7703052A
patent/FR2379695A1/en
active
Granted

1977-10-17
BE
BE181804A
patent/BE859803A/en
unknown

1977-10-19
GB
GB43442/77A
patent/GB1592202A/en
not_active
Expired

1977-11-07
IT
IT51712/77A
patent/IT1090919B/en
active

1978

1978-01-27
DE
DE19782803498
patent/DE2803498A1/en
not_active
Withdrawn

1978-01-30
LU
LU78965A
patent/LU78965A1/en
unknown

1978-01-31
NL
NL7801095A
patent/NL7801095A/en
not_active
Application Discontinuation

1978-01-31
US
US05/873,971
patent/US4170267A/en
not_active
Expired – Lifetime

1978-02-02
ES
ES1978240233U
patent/ES240233Y/en
not_active
Expired

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

GB2510433A
(en)

2013-02-05
2014-08-06
Attachment Torque Mfg China Co Ltd
Curved auger tooth and auger tooth holder

Also Published As

Publication number
Publication date

IT1090919B
(en)

1985-06-26

DE2803498A1
(en)

1978-08-10

LU78965A1
(en)

1978-09-28

FR2379695B1
(en)

1982-11-05

ES240233U
(en)

1979-07-01

NL7801095A
(en)

1978-08-07

ES240233Y
(en)

1980-04-01

US4170267A
(en)

1979-10-09

FR2379695A1
(en)

1978-09-01

BE859803A
(en)

1978-02-15

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