FI125342B - dRILL BIT - Google Patents

dRILL BIT Download PDF

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Publication number
FI125342B
FI125342B FI20135660A FI20135660A FI125342B FI 125342 B FI125342 B FI 125342B FI 20135660 A FI20135660 A FI 20135660A FI 20135660 A FI20135660 A FI 20135660A FI 125342 B FI125342 B FI 125342B
Authority
FI
Finland
Prior art keywords
locking
hole
insole
drill bit
open end
Prior art date
Application number
FI20135660A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI20135660A (en
Inventor
Antti Leino
Pasi Korte
Jussi Rautiainen
Jesse Laakso
Original Assignee
Robit Rocktools Ltd Oy
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.)
Filing date
Publication date
Application filed by Robit Rocktools Ltd Oy filed Critical Robit Rocktools Ltd Oy
Priority to FI20135660A priority Critical patent/FI125342B/en
Publication of FI20135660A publication Critical patent/FI20135660A/en
Application granted granted Critical
Publication of FI125342B publication Critical patent/FI125342B/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E21B10/327—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools the cutter being pivoted about a longitudinal axis

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Description

DRILLING BIT
Field of the invention
The invention relates to a drilling bit as defined in the preamble of independent claim 1.
The invention relates generally to superimposing drilling bits having pivoting bits symmetrically provided at the drilling bit, wherein each pivoting bit having a head member provided with cutting bits, wherein each pivoting bit is pivotable between an inwardly pivoted state, where the pivoting bit occupy a position inside a drilling bit diameter, and an outwardly pivoted state, where the pivoting bit occupy a position at least partly outside the drilling bit diameter.
Publication EP 0 563 561 B1 presents a superimposing drilling bit according to the prior art. This superimposing drilling bit comprises a head provided with cutting bits, a main shaft for attaching the drilling bit to a drilling apparatus or to a drilling means of a drilling apparatus, blind holes symmetrically disposed in the periphery of the drilling bit, recesses symmetrically disposed in the periphery of the drilling bit, a receiving bore in each recess, pivoting bits each having a shaft that is disposed in a receiving bore of a recess of the recesses, wherein each recess is partly penetrated by a blind hole in the periphery of the drilling bit, wherein each blind hole having an open end at the periphery of the drilling bit, wherein each shaft of a pivoting bit having a circumferential surface, wherein each pivoting bit having a head member provided with cutting bits, wherein each pivoting bit is pivotable between an inwardly pivoted state ,where the pivoting bit occupy a position inside a drilling bit diameter, and an outwardly pivoted state, where the pivoting bit occupy a position at least partly outside the drilling bit diameter, wherein each shaft of each pivoting bit comprises a notch in the circumferential surface of the shaft, and wherein a pin is arranged in each blind hole in the drilling bit so that each pin penetrating a notch in the circumferential surface of a shaft of a pivoting bit for locking the pivoting bit in the recess. A problem with such superimposing drilling bit is the locking of the pins in the blind holes due to vibrations when the drilling bit is used for its purpose i.e. for drilling. The pin should stay locked in the blind holes in such manner that it is possible, if needed, to open the locking for example for interchanging a pivoting bit locked in a recess by means of the locking pin.
Objective of the invention
The object of the invention is to provide a drilling bit that solves the above identified problem.
Short description of the invention
The drilling bit of the invention is characterized by the definitions of independent claim 1.
Preferred embodiments of the drilling bit are defined in the dependent claims.
In the drilling bit at least one blind hole of the blind holes is provided with a locking recess in the region of the open end of said at least one blind hole. A locking member is disposed in said at least one blind hole provided with a locking recess in the region of the open end of said at least one blind hole so that the locking member is disposed between the open end of said at least one blind hole and the pin disposed in said at least one blind hole for keeping the pin in said at least one blind hole. The locking member is configured for co-operation with the locking recess in the region of the open end of said at least one blind hole for locking the locking member in place in said at least one blind hole.
List of figures
In the following the invention will described in more detail by referring to the figures, of which
Figure 1 shows a drilling bit,
Figure 2 is a partly cut view of the drilling bit shown in figure 1,
Figure 3 shows in side view a pivoting bit of the drilling bit shown in figure 1,
Figure 4 is a sectional view of a detail of a first embodiment of the drilling bit,
Figure 5 shows the locking member, the spring means, and the locking pin of the first embodiment of the drilling bit that is shown in figure 4,
Figure 6 is a sectional view of a detail of a second embodiment of the drilling bit, and
Figure 7 shows the locking member, and the locking pin of the second embodiment of the drilling bit that is shown in figure 6.
Detailed description of the invention
The figures show two different embodiments of the drilling bit.
The drilling bit comprises a head 1 provided with cutting bits 2.
The drilling bit comprises a main shaft 3 for attaching the drilling bit to a drilling apparatus (not shown in the drawings) or to a drilling means (not shown in the drawings) of a drilling apparatus.
The drilling bit comprises blind holes 4 symmetrically disposed in the periphery of the drilling bit.
The drilling bit comprises recesses 5 symmetrically disposed in the periphery of the drilling bit.
The drilling bit comprises a receiving bore 6 in each recess. Each receiving bore 6 may extend in a direction parallel with a rotation axis of the drilling bit.
The drilling bit comprises pivoting bits 7 each having a shaft 8 that is disposed in a receiving bore 6 of a recess 5 of the recesses 5.
Each receiving bore 6 is partly penetrated by a blind hole 4 in the periphery of the drilling bit. Each blind hole 4 may extend in a direction perpendicular to a rotation axis of the drilling bit.
Each blind hole 4 has an open end 9 at the periphery of the drilling bit.
Each shaft 8 of a pivoting bit 7 has a circumferential surface 10.
Each pivoting bit 7 has a head member 11 provided with cutting bits 2.
Each pivoting bit 7 is pivotable between an inwardly pivoted state, where the pivoting bit 7 occupy a position inside a drilling bit diameter, and an outwardly pivoted state, where the pivoting bit 7 occupy a position at least partly outside the drilling bit diameter.
Each shaft 8 of each pivoting bit 7 comprises a notch 12 in the circumferential surface 10 of the shaft 8. The notch 12 may be in the form of a circumferential notch 12 in the circumferential surface 10 of the shaft 8. A locking pin 13 is arranged in each blind hole 4 in the drilling bit so that each locking pin 13 penetrating a receiving bore 6 in the circumferential surface 10 of a shaft 8 of a pivoting bit 7 for locking the pivoting bit 7 in the receiving bore 6.
At least one blind hole 4 of the blind holes 4 is provided with a locking recess 14 in the region of the open end 9 of said at least one blind hole 4. A locking member 24 is disposed in said at least one blind hole 4 provided with a locking recess 14 in the region of the open end 9 of said at least one blind hole 4 so that the locking member 24 is disposed between the open end 9 of said at least one blind hole 4 and the locking pin 13 disposed in said at least one blind hole 4 for keeping the locking pin 13 in said at least one blind hole 4. The locking member 24 is configured for co-operation with the locking recess 14 in the region of the open end 9 of said at least one blind hole 4 for locking the locking member 24 in place in said at least one blind hole 4.
Figures 4 and 5 shows detail views of a first embodiment of the drilling bit. In this first embodiment the open end 9 of the blind hole 4 have an inserting section 15 having an oblong cross-shape having a large width and a narrow width.
In this this first embodiment of the drilling bit the locking member 24 comprises an oblong section having an oblong cross-shape having a large diameter 16 and a narrow diameter 17.
In this first embodiment of the drilling bit, the locking member 24 is insertable into locking recess 14 of the blind hole 4 through the open end 9 of the blind hole 4 and subsequently turnable in the locking recess 14 in the region of the open end 9 of the blind hole 4 into a locking position where the larger diameter of the oblong section of the locking member 24 is behind the narrow width of the open end 9 of the blind hole 4 for locking the locking member 24 in said least one blind hole 4.
In this first embodiment of the drilling bit, the locking recess 14 may be an annular groove. In this first embodiment of the drilling bit the locking recess 14 may be in the form of two groove sections provided diametrically in the narrow width of the inserting section 15 of the blind hole 4.
In this this first embodiment of the drilling bit, the inserting section 15 of the blind hole 4 may, as shown in figure 4, be the outermost portion of the blind hole 4. In this first embodiment of the drilling bit the inserting section 15 may extend between the periphery of the drilling bit and the groove in the region of the open end 9 of the blind hole 4.
In this this first embodiment of the drilling bit, when the locking member 24 is in the locking position, at least one flushing channel leading from the outside of the drilling bit into the blind hole 4 and past the locking member 24 in the blind hole 4 may be formed between the locking member 24 and the surrounding walls of the blind hole 4. Such flushing channel may be used for blowing pressurized air into the blind hole 4 for cleaning the blind hole 4 for example in connection with removing of the locking member 24 and the locking pin 13 from the blind hole 4.
In this this first embodiment of the drilling bit, a spring means 18 may, as show in figure 4, be disposed between the locking member 24 and the locking pin 13 in said least one blind hole 4. If the drilling bit is provided with such spring means 18, the locking member 24 may comprise a second blind hole 19 for at least partly receiving the spring member and for holding the spring member in place in the blind hole with respect to the locking member 24. If the drilling bit is provided with such spring means 18, a proximal end of the locking pin 13, which proximal end is closer to the open end 9 of the blind hole 4 than a distal end of the locking pin 13 that is located closer to a bottom of the blind hole 4, may be provided with a third blind hole 20 for at least partly receiving the spring means 18 and for holding the spring means 18 in position with respect to the locking pin 13. If the drilling bit is provided with such spring means 18, the spring means 18 may be compressed between the locking member 24 and the locking pin 13 said least one blind hole 4 when the locking member 24 is in said locking position.
Figures 5 and 6 shows detail views of a second embodiment of the drilling bit. In this second embodiment of the drilling bit the locking member 24 comprises a plastically deformable cup part 21. The plastically deformable cup part 21 is plastically deformed so that parts of the plastically deformable cup part 21 are disposed in the locking recess 14 in the region of the open end 9 of the blind hole 4 for locking the locking member 24 in said least one blind hole 4. The plastically deformable cup part 21 may for example be deformed by hammering. The plastically deformable cup part 21 is preferably, but not necessarily, made at least partly of metal.
The plastically deformable cup part 21 has preferably, but not necessarily, an outer periphery that is preferably, but not necessarily, as shown in figure 7, circular before plastically deforming the plastically deformable cup part 21 so that parts of the plastically deformable cup part 21 are disposed in the locking recess 14 in the region of the open end 9 of the blind hole 4 for locking the locking member 24 in said least one blind hole 4.
In this second embodiment of the drilling bit, the locking member 24 may comprise an elongate member 22 extending from the plastically deformable cup part 21 towards the locking pin 13.
In this second embodiment of the drilling bit, a flexible damping member 25 made for example at least partly of rubber may be disposed between the locking member 24 and the locking pin 13 in said least one blind hole 4. If the drilling bit is provided with such flexible damping member 25, the locking member 24 may comprise a second blind hole 19 for at least partly receiving the flexible damping member 25 and for holding the flexible damping member 25 in place in the blind hole with respect to the locking member 24. If the drilling bit is provided with such flexible damping member 25, the end of the locking pin 13, which end is closer to the open end 9 of the blind hole 4, may be provided with a third blind hole 20 for at least partly receiving the flexible damping member 25 and for holding the flexible damping member 25 in position with respect to the locking pin 13.
In this second embodiment of the drilling bit, the plastically deformable cup part 21 may comprise at least one cut-out 23 extending inwards from an outer periphery of the plastically deformable cup part 21 for facilitating deformation of the plastically deformable cup part 21. The cut-out 23 may also be used for preventing the locking member 24 from rotating in the blind hole 4 by accommodating a split pin 28 both in the cut-put 23 and in locking formations (not shown in the figures) the locking recess 14 in the region of the open end 9 of said blind hole 4.
In this second embodiment of the drilling bit, the locking member 24 may, as shown in figures 5 and 6, be provided with a first central opening 26 for a gripping means (not shown in the figures) for facilitating removing the locking member 24 from the blind hole 4.
In this second embodiment of the drilling bit, the locking pin 13 may, as shown in figures 5 and 6, be provided with a second central blind opening 27 for a gripping means for facilitating removing the locking pin 13 from the blind hole 4.
It is apparent to a person skilled in the art that as technology advances, the basic idea of the invention can be implemented in various ways. The invention and its embodiments are therefore not restricted to the above examples, but they may vary within the scope of the claims.

Claims (10)

1. Porakruunu, j oka käsittää leikkausosilla (2) varustetun pään (1), pääakselin (3) porakruunun kiinnittämiseksi porauslaitteeseen tai porauslaitteen porausvälineeseen, pohjallisia reikiä (4) sijoitettuina symmetrisesti porakruunun ulkoreunalle, syvennyksiä (5) sijoitettuina symmetrisesti porakruunun ulkoreunalle, kussakin syvennyksessä (5) olevan vastaanottoreiän (6), kääntyviä osia (7), joissa kussakin on akseli (8), joka on sijoitettu vastaanottoreikään (6) syvennyksistä (5) yhdessä syvennyksessä (5), jolloin kunkin vastaanottoreiän (6) läpäisee osittain pohjallinen reikä (4) porakruunun ulkoreunalla, jolloin kullakin pohjallisella reiällä (4) on avoin pää (9) porakruunun ulkoreunalla, jolloin kullakin kääntyvän osan (7) akselilla (8) on kehäpinta (10), jolloin kullakin kääntyvällä osalla (7) on pääosa (11), joka on varustettu leikkausosilla (2), jolloin kukin kääntyvä osa (7) on käännettävissä kahden tilan välillä, jotka ovat sisäänpäin käännetty tila, jossa kääntyvä osa (7) sijaitsee porakruunun halkaisijan sisäpuolella olevassa asemassa, sekä ulospäin käännetty tila, jossa kääntyvä osa (7) sijaitsee vähintään osittain porakruunun halkaisijan ulkopuolella olevassa asemassa, jolloin kunkin kääntyvän osan (7) kukin akseli (8) käsittää akselin (8) kehäpinnalla (10) olevan loven (12), jolloin kuhunkin porakruunun pohjalliseen reikään (4) on järjestetty lukitustappi (13), niin että kukin lukitustappi (13) työntyy kääntyvän osan (7) akselin (8) kehäpinnan (10) loveen (12) kääntyvän osan (7) lukitsemiseksi vastaanottoreikään (6), jolloin vähintään yksi pohjallinen reikä (4) pohjallisista rekistä (4) on varustettu lukitussyvennyksellä (14), joka sijaitsee mainitun vähintään yhden pohjallisen reiän (4) avoimen pään (9) alueella, jolloin lukitusosa (24) on sijoitettu mainittuun vähintään yhteen pohjalliseen reikään (4) mainitun vähintään yhden pohjallisen reiän (4) avoimen pään ja mainittuun vähintään yhteen pohjalliseen reikään sijoitetun lukitustapin (13) välille lukitustapin (13) pitämiseksi mainitussa vähintään yhdessä pohjallisessa reiässä (4), ja jolloin lukitusosa (24) on konfiguroitu toimimaan yhdessä lukitussyvennyksen (14) kanssa mainitun vähintään yhden pohjallisen reiän (4) avoimen pään (9) alueella lukitusosan (24) lukitsemiseksi paikoilleen mainittuun vähintään yhteen pohjalliseen reikään (4), tunnettu siitä, että pohjallisen reiän (4) avoimessa päässä (9) on sisäänvientiosuus (15), jolla on pitkänomainen poikkileikkausmuoto, jolla on suuri leveys ja kapea leveys, lukitusosa (24) käsittää pitkänomaisen osuuden, jolla on pitkänomainen poikkileikkausmuoto, jolla on suuri halkaisija ja kapea halkaisija, ja että lukitusosa (24) on työnnettävissä pohjallisen reiän (4) lukitussyvennykseen (14) pohjallisen reiän (4) avoimen pään (9) kautta ja sen jälkeen käännettävissä lukitussyvennyksessä (14) pohjallisen reiän (4) avoimen pään (9) alueella lukitusasentoon, jossa lukitusosan (24) pitkänomaisen osuuden suurempi halkaisija on pohjallisen reiän (4) avoimen pään (9) kapean leveyden takana, lukitusosan (24) lukitsemiseksi vähintään yhteen pohjalliseen reikään (4).A drill bit comprising a head (1) with cutting members (2), a main shaft (3) for attaching a drill bit to a drilling device or drilling device, insoles (4) disposed symmetrically on the outer drill bit, recesses (5) disposed symmetrically on the drill bit, 5) having a receiving hole (6), pivoting portions (7) each having an axis (8) disposed in the receiving hole (6) of the recesses (5) in one of the recesses (5), wherein each receiving hole (6) is partially penetrated by the insole hole (6); 4) the outer edge of the drill bit, each of the insole holes (4) having an open end (9) the outer edge of the drill bit, each shaft (8) of the pivoting part (7) having a circumferential surface (10) provided with cutting members (2), wherein each pivoting member (7) is pivotable between two spaces an inwardly pivoted space in which the pivoting portion (7) is located at a position inside the drill bit diameter and an outwardly pivoted space in which the pivoting portion (7) is located at least partially outside the borehole diameter, wherein each axis (8) a notch (12) on the peripheral surface (10) of the shaft (8), wherein a locking pin (13) is provided in each bore hole (4) of the drill bit so that each locking pin (13) protrudes from the peripheral surface (10) for locking the pivoting part (7) in the receiving hole (6), the at least one foot hole (4) of the foot sleeves (4) being provided with a locking recess (14) located at the open end (9) of said at least one foot hole (4). in an area where the locking member (24) is disposed in said at least one foot hole (4) of said at least one foot between the open end of its hole (4) and a locking pin (13) disposed in said at least one insole to hold the locking pin (13) in said at least one insole (4), and wherein the locking member (24) is configured to cooperate with said locking recess in the region of the open end (9) of one insole hole (4) for locking the locking member (24) into said at least one insole hole (4), characterized in that the open end (9) of the insole hole (4) has an inlet portion (15) having a wide width and a narrow width, the locking member (24) comprises an elongated portion having an elongated cross-sectional shape having a large diameter and a narrow diameter, and that the locking member (24) is slid into the locking recess (14) of the insole (4) through the open end (9) and thereafter pivotable in the locking recess (14) in the region of the open end (9) of the insole hole (4) to a locking position with a larger diameter of the elongate portion of the locking member (24) behind the narrow width of the open end (9) of the insole (4) in the hole (4). 2. Patenttivaatimuksen 1 mukainen porakruunu, tunnettu siitä, että lukitussyvennys (14) on rengasmainen ura.Drill bit according to claim 1, characterized in that the locking recess (14) is an annular groove. 3. Patenttivaatimuksen 2 mukainen porakruunu, tunnettu siitä, että lukitussyvennys (14) on kahden uraosuuden muotoinen, jotka on aikaansaatu vastakkain pohjallisen reiän (4) sisäänvientiosuuden (15) kapealle leveydelle.A drill bit according to claim 2, characterized in that the locking recess (14) is in the form of two groove portions which are provided opposite to a narrow width of the insertion part (15) of the insole hole (4). 4. Minkä tahansa patenttivaatimuksista 1-3 mukainen porakruunu, tunnettu siitä, että pohjallisen reiän (4) sisäänvientiosuus (15) on pohjallisen reiän (4) uloin osa.A drill bit according to any one of claims 1 to 3, characterized in that the insertion portion (15) of the insole hole (4) is the outermost part of the insole hole (4). 5. Minkä tahansa patenttivaatimuksista 1-4 mukainen porakruunu, tunnettu siitä, että sisäänvientiosuus (15) kulkee porakruunun ulkoreunan ja pohjallisen reiän (4) avoimen pään (9) alueella olevan uran välillä.A drill bit according to any one of claims 1 to 4, characterized in that the inlet portion (15) extends between the outer edge of the drill bit and the groove in the open end (9) of the insole (4). 6. Minkä tahansa patenttivaatimuksista 1-5 mukainen porakruunu, tunnettu siitä, että kun lukitusosa (24) on lukitusasemassa, lukitusosan (24) ja pohjallista reikää (4) ympäröivien seinämien väliin muodostuu vähintään yksi huuhtelukanava, joka johtaa porakruunun ulkopuolelta pohjalliseen reikään (4) ja pohjallisessa reiässä (4) olevan lukitusosan (24) ohi.A drill bit according to any one of claims 1 to 5, characterized in that when the locking part (24) is in the locking position, at least one flushing channel is formed between the locking part (24) and the walls surrounding the bottom hole (4). and past the locking member (24) in the insole hole (4). 7. Minkä tahansa patenttivaatimuksista 1-6 mukainen porakruunu, tunnettu jousivälineestä (18), joka on sijoitettu lukitusosan (24) ja lukitustapin (13) väliin vähintään yhteen pohjalliseen reikään (4).A drill bit according to any one of claims 1 to 6, characterized by a spring means (18) disposed between the locking member (24) and the locking pin (13) in at least one bottom hole (4). 8. Patenttivaatimuksen 7 mukainen porakruunu, tunnettu siitä, että lukitusosa (24) käsittää toisen pohjallisen reiän (19) jousiosan vastaanottamiseksi vähintään osittain ja jousiosan pitämiseksi paikoillaan pohjallisessa reiässä suhteessa lukitusosaan (24).Drill bit according to claim 7, characterized in that the locking part (24) comprises a second insole (19) for receiving at least partially the spring part and for holding the spring part in the insertion hole in relation to the locking part (24). 9. Patenttivaatimuksen 7 tai 8 mukainen porakruunu, tunnettu siitä, että lukitustapilla (13) on proksimaalinen pää, joka proksimaalinen pää on lähempänä pohjallisen reiän (4) avointa päätä (9) kuin lukitustapin (13) distaalinen pää, joka sijaitsee lähempänä pohjallisen reiän (4) pohjaa, ja jolloin se on varustettu kolmannella pohjallisella reiällä (20) jousivälineen (18) vastaanottamiseksi vähintään osittain sekä jousivälineen (18) pitämiseksi paikoillaan suhteessa lukitustappiin (13).Drill bit according to Claim 7 or 8, characterized in that the locking pin (13) has a proximal end, which proximal end is closer to the open end (9) of the insole hole (4) than the distal end of the locking pin (13), which is closer to the insole hole (13). 4) a base, and wherein it is provided with a third insertion hole (20) for receiving at least partially the spring means (18) and for holding the spring means (18) in relation to the locking pin (13). 10. Minkä tahansa patenttivaatimuksista 7-9 mukainen porakruunu, tunnettu siitä, että jousiväline (18) puristuu mainitun vähintään yhden pohjallisen reiän (4) lukitusosan (24) ja lukitustapin (13) väliin, kun lukitusosa (24) on mainitussa lukitusasennossa.Drill bit according to any one of claims 7 to 9, characterized in that the spring means (18) is pressed between the locking part (24) of said at least one insole (4) and the locking pin (13) when the locking part (24) is in said locking position.
FI20135660A 2013-06-17 2013-06-17 dRILL BIT FI125342B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI20135660A FI125342B (en) 2013-06-17 2013-06-17 dRILL BIT

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Application Number Priority Date Filing Date Title
FI20135660A FI125342B (en) 2013-06-17 2013-06-17 dRILL BIT
FI20135660 2013-06-17

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FI20135660A FI20135660A (en) 2014-12-18
FI125342B true FI125342B (en) 2015-08-31

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