• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    system and method for retaining leg in hybrid drills an earth drill drilling drill comprising: one or more legs; a drill body having a blade and a groove for receiving the leg and one or more wedges between the leg and the groove securing the leg within the groove. the groove can have two parallel side walls, one of the side walls forming an acute angle and the other forming an obtuse angle. the wedge can be fixed immediately next to the obtuse angle side wall. the wedge can have two sides of obtuse angle. one or more screws through each wedge can hold both the wedge and the leg in the drill body. in a preferred embodiment, an obtuse angle side wall of the wedge is preferably attached immediately beside an acute angle side of the leg.
    公开号:BR112013020524B1
    申请号:R112013020524-5
    申请日:2012-02-07
    公开日:2020-09-29
    发明作者:Gregory L. Ricks；Floyd C. Felderhoff；Rudolf C. Pessier
    申请人:Baker Hughes Incorporated；
    IPC主号:
    专利说明:

    CROSS REFERENCE FOR RELATED ORDERS
    The present application claims priority benefit from US Serial Order No. 12 / 114,537, filed on May 2, 2008 and entitled, "System and Method for Leg Retention on Hybrid Bits", which is hereby incorporated by specific reference. DECLARATION REGARDING RESEARCH OR DEVELOPMENT SPONSORED BY THE FEDERAL GOVERNMENT
    Not applicable. REFERENCE TO APPENDIX
    Not applicable. BACKGROUND OF THE INVENTION
    Field of the Invention. The present inventions generally relate to earth-boring drill bits and, in particular, to a drill bit having a combination of rolling and fixed cutters and cutting elements and a method of drilling with it. Description of the related technique
    US Patent 3,294,186 discloses the use of nickel shims for brazing rock drill components.
    US Patent No. 3,907,191 discloses a "rotary rock drill is constructed from a multiplicity of individual segments. Each individual segment includes two separation faces and a meter cut surface. The individual segments are positioned adjacent to each other with the separation faces of the adjacent segments in abutment relationship with each other. A ring gauge is positioned around the segments and the individual segments are moved relative to each other causing the separation faces of an individual segment to slide against the separation faces of adjacent segments The segments are moved until the segment meter cut surfaces contact the ring gauge thus ensuring that the finished drill will have the desired gauge size.The segments are welded together over a portion substantial separation faces ".
    US Patent No. 5,439,067 discloses a "rotary cone drill to form a well hole having a one-piece drill body with a lower portion having a convex outer surface and an upper portion adapted for connection to a drill string. A number of support arms are preferably attached to and dependent on the drill body.Each support arm has an inner surface with a spindle connected to it and an outer surface.Each spindle generally projects downward and inward relative to the associated support arm A number of cutter cone assemblies equal to the number of support arms are mounted on each of the spindles The support arms are spaced outside the drill body to provide improved fluid flow between the portion the lower body of the drill body and the support arms. In addition, the length of the support arms is selected to provide improved fluid flow between the associated cutter cone assembly and the lower portion of the drill body. The same drill body can be used with several rotary cone drill bits with different gauge diameters ".
    US Patent No. 5,439,068 discloses a "rotary cone drill to form a well hole having a one-piece drill body with a lower portion having a convex outer surface and an upper portion adapted for connection to a drill string. The drill bit generally rotates around a central axis of the drill body, a number of support arms are preferably attached to pockets formed in and dependent on the drill body. Each support arm has an inner surface with a spindle connected to it and an outer surface.Each spindle generally projects downward and inward with respect to the longitudinal axis of the associated support arm and the central axis of the drill body.A number of cutter cone sets equal to the number of support arms are mounted on each of the spindles respectively. The spacing between each of the support arms together with their respective length and width dimensions is selected for the increase the flow of fluid between the cutter cone assemblies mounted on the respective support arms and the lower portion of the drill body. A lubricant reservoir is preferably provided on each support arm for supplying the lubricant for one or more sets of bearings arranged between each set of cutter cone and its associated spindle. Or the corresponding openings and posts or corresponding keyway and keyway grooves can be used to position and align a portion of each support arm in its associated bag during the manufacture of the resulting drill bit ".
    US Patent No. 5,595,255 discloses a "rotary cone drill to form a well hole having a drill body with an upper end portion adapted for connection to a drill string. The drill bit rotates about an axis center of the body A number of support arms preferably extend from the drill body The support arms can be formed either as an integral part of the drill body or attached to the outside of the drill body in bags sized to receive the arm associated support arm. Each support arm has a lower portion with an inner surface and a spindle connected to it and an outer diaper surface. Each shaft generally projects downward and inward relative to its associated support arm. of cutter cone sets equal to the number of support arms are mounted on the spindles respectively. A neck relief area is provided at the bottom of each support arm adjacent to the associated spindle to increase the flow of fluid between the support arm and the respective cutter cone assembly ".
    US Patent No. 5,606,895 discloses a "rotary cone drill having a one-piece drill body with a lower portion having a convex outer surface and an upper portion adapted for connection to a drill string. The drill bit generally rotates around a central axis of the drill body to form a well bore. A number of support arms are preferably attached to pockets formed in the drill body and depend on it. The drill body and support arms cooperate with others to reduce initial manufacturing costs and to allow rebuilding of a worn drill bit.Each support arm has an inner surface with a spindle connected to it and an outer diaper surface.Each spindle generally projects down and in relation to the longitudinal axis of the associated support arm and the central axis of the drill body. A number of cutter cone sets equal to the number of support arms are small. respectively in each of the spindles. The radial spacing of the support arms over the associated drill body perimeter along with their respective length and width are selected to increase the fluid flow between the cutter cone assemblies mounted on the respective support arms and the lower body portion drill bit. The resulting drill bit provides greater fluid flow, increased seal and bearing life, better down well performance and standardized manufacturing and design procedures. "
    US Patent No. 5,624,002 discloses a "rotary cone drill having a one-piece drill body with a lower portion having a convex outer surface and an upper portion adapted for connection to a drill string. The drill bit generally rotates around a central axis of the drill body to form a well bore. A number of support arms are preferably attached to pockets formed in the drill body and depend on it. The drill body and support arms cooperate with each other the others to reduce initial manufacturing costs and to allow rebuilding of a worn drill bit.Each support arm has an inner surface with a spindle connected to it and an outer diaper surface.Each spindle generally projects downward and inward in relation to the longitudinal axis of the associated support arm and the central axis of the drill body. A number of cutter cone sets equal to the number of support arms are mounted respectively in each of the spindles. The radial spacing of the support arms over the associated drill body perimeter along with their respective length and width are selected to increase the flow of fluid between the cutter cone assemblies mounted on the respective support arms and the lower body portion drill bit. The resulting drill bit provides greater fluid flow, increased seal and bearing life, better downhole performance and standardized manufacturing and design procedures. "
    Design Patent No. US D372,253 shows a support arm and rotary cone for modular drill bit.
    The inventions described and taught herein are directed to an improved hybrid drill containing a combination of rolling and fixed cutters and cutting elements. BRIEF SUMMARY OF THE INVENTION
    The inventions disclosed and taught here are directed to an earth drill drilling bit comprising: one or more legs; a drill body having a blade and a groove to receive the leg; and one or more wedges between the leg and the groove securing the leg within the groove. The groove may have two side walls parallel with one side wall forming an acute angle and the other forming an obtuse angle. The wedge can be fixed immediately next to the obtuse angle side wall. The wedge can have two sides of obtuse angle. The drill can include one or more screws through each wedge to hold both the wedge and the leg in the drill body. In alternative embodiments, the groove may have two side walls that are not parallel to each other, for example, with a first of the side walls extending out approximately straight from an axial center of the drill body. In this case, the wedge is preferably fixed immediately beside this first side wall. In most cases, however, an obtuse-angle side wall of the wedge is preferably attached immediately to an acute-angle face of the leg. BRIEF DESCRIPTION OF THE VARIOUS VIEWS OF THE DRAWINGS
    Figure 1 is a bottom plan view of an embodiment of a hybrid earth drill bit;
    Figure 2 is a side elevation view of an embodiment of the hybrid earth boring drill bit of Figure 1;
    Figure 3 is an exploded view of another embodiment of the Figure 1 hybrid earth drill bit constructed in accordance with the present invention;
    Figure 4 is a rotational side view composed of the hybrid earth borehole drill bit of Figure 1;
    Figure 5 is a simplified side view of the Figure 1 hybrid earth drill bit constructed in accordance with the present invention, and
    Figure 6 is a simplified cross-sectional plan view of the hybrid earth boring drill bit of Figure 1 constructed in accordance with the present 8/19 invention;
    Figure 7 is an exploded view of Figure 6, and
    Figure 8 is a simplified cross-sectional elevation view of the Figure 1 hybrid earth drill bit constructed in accordance with the present invention. DETAILED DESCRIPTION OF THE INVENTION
    The Figures described above and the written description of the specific structures and functions below are not presented to limit the scope that the claimants invented or the scope of the appended claims. Instead, the figures and written description are provided to teach anyone skilled in the art to make and use the inventions for which patent protection is sought. Those skilled in the art will appreciate that not all elements of a commercial modality of the inventions are described or shown for the sake of clarity and understanding. People skilled in the art will also appreciate that the development of a real commercial modality incorporating aspects of the present invention will require numerous specific execution decisions to achieve the developer's ultimate goal for the commercial modality. Such specific implementation decisions may include, and are probably not limited to, compliance with system-related, business-related, government-related and other restrictions, which may vary by specific implementation, location, and from time to time. Although efforts by the developer can be complex and time-consuming in an absolute sense, such efforts would nevertheless be a routine task for those skilled in the art for the sake of this description. It should be understood that the inventions described and taught here are susceptible to numerous and diverse modifications and alternative forms. Finally, the use of a singular term, such as, but not limited to, "a", is not intended to limit the number of items. In addition, the use of relational terms such as, but not limited to, "top", "bottom", "left", "right", "top", "bottom", "top", "bottom", "side" and the like are used in the written description for clarity with specific reference to the Figures and are not intended to limit the scope of the invention or the appended claims.
    Applicants have created an earth drill drilling drill comprising: one or more legs; a drill body having a blade and a groove for receiving the leg and one or more wedges between the leg and the groove securing the leg within the groove. The groove can have two parallel side walls, one of the side walls forming an acute angle and the other forming an obtuse angle. The wedge can be fixed immediately next to the obtuse angle side wall. The wedge can have two sides of obtuse angle. The drill can include one or more screws through each wedge to hold both the wedge and the leg in the drill body. In alternative embodiments, the groove may have two side walls that are not parallel to each other, for example, with a first of the side walls extending out approximately straight from an axial center of the drill body. In this case, the wedge is preferably fixed immediately beside this first side wall. In most cases, however, an obtuse angle side wall of the wedge is preferably attached immediately to an acute angle side of the leg.
    Referring to Figures 1-2, an illustrative embodiment of a modular hybrid earth drill bit is disclosed. Drill 11 may be similar to that shown in Patent Application Publication No. US 20090272582 and / or 20080296068, both of which are incorporated herein by specific reference. The drill 11 comprises a drill body 13 having a longitudinal axis 15 that defines an axial center of the drill body 13. A plurality (for example, two shown) of drill legs or heads 17 extend from the drill body 13 in the direction axial, parallel to the longitudinal axis 15. Because the legs 17 are held on the drill body 13, the legs can also protrude radially from the drill body 13. The drill body 13 also has a plurality of fixed blades 19 extending on the axial direction.
    Rolling cutters 21 are mounted to respective drill legs 17. Each of the rolling cutters 21 is formed and located in such a way that each surface of the rolling cutters 21 is radially spaced from the axial center 15 by a minimum radial distance 23. A plurality of rolling cutter cutting inserts or elements 25 are mounted to the rolling cutters 21 and radially spaced from the axial center 15 by a minimum radial distance 27. The minimum radial distances 23, 27 may vary according to the application, and may vary from cutter to cutter and / or cutting element to cutting element.
    In addition, a plurality of fixed cutting elements 31 are mounted on the fixed blades 19. At least one of the fixed cutting elements 31 can be located in the axial center 15 of the drill body 13 and adapted to cut a formation in the axial center. In one embodiment, at least one of the fixed cutting elements 31 is within approximately 0.040 inches of the axial center. Examples of rolling cutter cutting elements 25 and fixed cutting elements 31 include tungsten carbide inserts, cutters made of super-rigid material such as polycrystalline diamond, and others known to those skilled in the art.
    Figure 3 illustrates the modular aspect of drill 11. Figure 3 is an exploded view of the various parts of drill 111 disassembled. The illustrative modality in Figure 3 is a three-blade drill with three cutters. The modular construction principles of the present invention are equally applicable to two-bladed drill, two-cutter 11 of Figures 1 and 2, and hybridized drill bits with any combination of fixed blades and rolling cutters.
    As illustrated, drill 111 comprises a rod portion or section 113, which is screwed or otherwise configured in its upper extension for connection with a drill bit. To the smallest extent of the stem portion 113, a generally cylindrical container 115 is formed. Container 115 receives a dimensioned cylindrical portion and correspondingly formed 117 in the upper extension of a drill body portion 119. Shank portions 113 and body 119 are joined by inserting the cylindrical portion 117 into the upper extension of the body portion 119 inwardly of the cylindrical container 115 on the lower extension of the stem 113. For the 12-1 / 4-inch drill shown, the container is a Class 2 female thread that engages with a corresponding male thread on the upper body extension. A circular seam or joint is then continuously welded by a bead to hold the two portions or sections together. Container 115 and upper extension 117 do not need to be cylindrical, but they can have other shapes that mate together, or they can have a sliding or sliding fit based on the weld for resistance. As an alternative, the joint can be reinforced by a narrow interference fit between the upper extension 119 and container 115. Adhesive weld around, and / or complete welding of the seam can also be used.
    A drill leg or head 17, 121 (three are shown) is received in a groove extending axially 123 (again, there is a groove 123 for each leg or head 121). Groove 123 can be hinged (and leg 121 correspondingly formed) so that only axial sliding of leg 121 is allowed and leg 121 resists radial removal from groove 123. The plurality (four) of screws 127 and washers protect each leg 121 in the groove 123 so that the leg 121 is secured against axial movement and removal from the groove 123. A rolling cutter 125 is attached to a bearing associated with each leg 121 by a ball seal and lock assembly 129. The openings in the leg 121 through which the screws 127 extend can be oblong and / or oversized, to allow axial and / or radial positioning of the leg 121 inside the groove 123, which in turn allows selection of the relative projection of the elements cutter on each rolling cutter. A set of lubricating compensator 131 is also carried on each leg 121 and supplies lubricant to the bearing assembly and compensates for pressure variations in the lubricant during drilling operations. At least one nozzle 133 is received and retained in the drill body portion 119 to direct a stream of drilling fluid from inside the drill 111 to selected locations close to the cutters and drill blades.
    The groove 123 preferably has a pair of adjacent opposite sides 135, 135a, 135b (Figure 6). As will be discussed in more detail below, sides 135 can be angled. A third side 137 (Figure 6), which can be curved or flat, connects the two opposite sides 135. A blind threaded hole or opening 139 (Figure 6) is formed in the drill body 13, 119 to receive each of the fasteners or screws 127.
    As shown in Figure 4, the roller cone cutting elements 25 and the fixed cutting elements 31 combine to define a cutting profile 41 that extends from the axial center 15 to a more radially outer perimeter 43 with respect to the axis. In one embodiment, only the fixed cutting elements 31 form the cutting profile 41 in the axial center 15 and the outermost perimeter radially 43. However, the roller cone cutting elements 25 overlap with the fixed cutting elements 31 in the cutting profile 41 between the axial center 15 and the outermost perimeter radially 43. The roller cone cutting elements 25 are configured to cut on nose 45 and shoulder 47 of cutting profile 41, where nose 45 is the part of front of the profile (that is, located between the axial center 15 and the shoulder 47) facing the well hole wall and located adjacent to the outermost perimeter radially 43.
    Thus, the roller cone cutting elements 25 and the fixed cutting elements 31 combine to define a common cutting face 51 (Figure 2) on nose 45 and shoulder 47, which are known to be the weakest parts of a profile of fixed cutter drill. Cutting face 51 is located at an axial distal end of the hybrid drill bit 11. In one embodiment, at least one of each of the roller cone cutting elements 25 and the fixed cutting elements 31 extend in the axial direction on the face cutting edge 51 in a substantially equal dimension. In one embodiment, the roller cone cutting elements 25 and the fixed cutting elements 31 are radially displaced from each other, although they align axially. However, axial alignment between the most distal elements 25, 31 is not necessary such that elements 25, 31 can be axially spaced apart by a significant distance when in their most distal position. For example, the roller cone cutting elements 25 or the fixed cutting elements 31 may extend beyond, or may not extend completely to, the cutting face 51. In other words, the roller cone cutting elements 25 may extend for the cutting face 51 with the fixed cutting elements 31 axially offset from the cutting face 51.
    With reference also to Figure 5, while the legs 17, 121 can be welded into the grooves 123 of the drill body 13, the legs can additionally, or alternatively, be secured by means of one or more wedges 201. The wedges 201 also they can be welded and / or bolted to the drill body 13, for example, using fasteners or screws 127.
    As shown in Figures 6 and 7, the sides, side walls, 135 of the groove 123 can be angled. More specifically, a first side 135a can be angled at an acute angle 141, while the other side 135b can be angled away from the first at an obtuse angle 143. With this construction, leg 17 is screwed inwardly of the groove 123 with a first side 145a abutting against the acute angle side 135a of the groove 123, thereby partially blocking the leg 17 in place. An acute angle 147 of the first side 145a of the leg 17, 121 preferably corresponds to the acute angle 141 of the first side 135a of the groove 123. In the preferred embodiment, a second side 145b of the leg 17 is also aligned with an acute angle 149, which it can be similar or exactly the same as the acute angle 147 of the first side 145a of the leg 17. The wedge 201 is then screwed into the groove 123, between the second acute angle side 145b of the leg 17 and the obtuse angle side 135b of the groove 123. Because the wedge 201 preferably has two obtuse angle sides 203, 230a, 230b, which form the indicated obtuse angles 151, 153, wedge 201 firmly holds leg 17 within groove 123 and screws 127 holding wedge 201 are tight. Plugs can then be welded along the screws 127 to prevent rotation of the screws 127 during operation, thus additionally holding the wedge 201 and the leg 17 inside the groove 123.
    The side walls 135 can be parallel, as shown. In this case, with the side walls 135 in parallel as shown, the screws 127 holding the leg 17 in place will experience less tension than the screws 127 holding the wedge 201 in place.
    Alternatively, the side walls 135a, 135b can be angled differently with respect to displacement from ninety degrees. For example, the first sidewall 135a and / or the second sidewall 135b can be aligned almost straight out from the axial center of the drill body 13, with the angles 141, being right angles essentially tangentially instead of the sharp angles and obtuses shown. In this way, the sides 135 of the groove 123 can be closer to the axial center of the drill body 13 and angled out and away from each other as they extend outward. This configuration would induce considerable stress loads on the screws 127 that hold both leg 17 and wedge 201 in place.
    In yet another embodiment, the first sidewall 135a can be angled as shown with the second sidewall 135b being aligned almost straight out from the axial center of the drill body 13. The angled sides 203 of the wedge 201 would still press the leg 17 against the first side wall 135a, thereby fixing the leg 17 in place. Alternatively, a first side 203a of the wedge 201 can be angled as shown, with a second side 203b of the wedge 201 being aligned almost straight out from the axial center of the drill body 13, together with the second side wall 135b. In this case, the angled side 203a of the wedge 201 will still press the leg 17 against the first side wall 135a, thereby fixing the leg 17 in place. In any case, however, the sides 203, 203a, 203b of the wedge 201 are not expected to be parallel, but need not have similar angles, with respect to the straight line out from the axial center of the drill body 13 .
    Referring also to Figure 8, an axial end 301 of the leg 17 pressing against an axial end 303 of the groove is expected to carry a major, if not all, of the normal axial load of the drilling operation. In some embodiments, the leg 17 may comprise a key extending radially inward 305 that extends into a keyway 307 in slot 123. In this case, an upper end 309 of keyway 305, pressing against the drill body 13, can carry a part of the normal axial load of the drilling operation. Perhaps more importantly, however, a lower end 311 of the key 305, pressing against the drill body 13, can carry any reverse axial load experienced by the leg 17, such as from the rear boring. This key 305 can also prevent screws 127 from carrying too much, or any shear loads. In some embodiments, the key 305 can be rigidly attached to the leg 17 and can even take the form of an integral raised area, or protrusion, which extends to the key groove 307 in the groove 123 to accommodate these loads.
    In any case, the wedge 201 of the present invention overcomes the tolerance problems that are normally associated with module parts and assembly thereof. The wedge 201, and other aspects, of the present invention also minimize or eliminate any need to weld the leg 17 to the drill body 13, thereby further facilitating the assembly processes, while still providing safe mounting of the drill 11. In addition , these features substantially simplify drill repair since few, if any, welded components can be arranged during rework of the drill 11, as the main components are merely screwed together. For example, welded plugs can simply be drilled, thus providing access to screws 127 to remove and / or replace legs 17, as needed.
    Other and additional modalities using one or more aspects of the inventions described above can be designed without departing from the spirit of the invention. In addition, the various methods and modalities of the present invention can be included in combination with each other to produce variations of the described methods and modalities. Discussion of singular elements may include plural elements and vice versa. For example, multiple wedges 201 can be used with each of the legs 17.
    The order of steps can occur in a variety of sequences, unless otherwise specifically limited. The various steps described here can be combined with other steps, placed in line with the steps indicated, and / or divided into several steps. Likewise, elements have been functionally described and can be incorporated as separate components or can be combined into components having multiple functions.
    The inventions have been described in the context of preferred embodiments and others not all of the invention has been described. Obvious modifications and changes to the 10 described modalities are available to those skilled in the art. The disclosed and undisclosed modalities are not intended to limit or restrict the scope or applicability of the invention conceived by the candidates, but rather, in accordance with patent laws, the 15 applicants intend to fully protect all these modifications and improvements that come within the scope of the patent. scope or equivalent range of the following claims.
    权利要求:
    Claims (15)
    [0001]
    1. Hybrid earth drill bit (11), characterized by the fact that it comprises: one or more fixed blades (19); one or more legs (17); at least one rolling cutter (21), wherein each rolling cutter is mounted on a respective one or more legs; a drill body (13) having a groove (123) for receiving the leg; and one or more wedges (201) between the leg and the groove securing the leg within the groove, so that one or more legs resist radial removal from the corresponding groove.
    [0002]
    2. Drill according to claim 1, characterized by the fact that the groove has two parallel side walls (135a, 135b).
    [0003]
    3. Drill according to claim 2, characterized by the fact that one of the side walls forms an acute angle and the other forms an obtuse angle (143).
    [0004]
    4. Drill according to claim 2, characterized by the fact that the wedge is immediately attached to the side of the obtuse angle side wall.
    [0005]
    5. Drill according to claim 1, characterized by the fact that the wedge has two sides (230a, 230b) of obtuse angle.
    [0006]
    6. Drill according to claim 1, characterized by the fact that it also includes one or more screws (127) through each wedge, holding both the wedge and the leg in the drill body.
    [0007]
    7. Drill according to claim 1, characterized by the fact that the groove has two side walls that are not parallel to each other.
    [0008]
    8. Drill according to claim 7, characterized in that a first of the side walls extends approximately straight out from an axial center of the drill body.
    [0009]
    9. Drill according to claim 8, characterized by the fact that the wedge is immediately attached to the first side wall.
    [0010]
    10. Drill according to claim 1, characterized by the fact that an obtuse angle side wall of the wedge is fixed immediately beside an acute angle side of the leg.
    [0011]
    11. Drill according to claim 1, characterized by the fact that a key (305) extends from each leg into the drill body.
    [0012]
    12. Drill according to any one of claims 1 to 11, characterized by the fact that: said one or more legs has corresponding roller cones (25); a drill body has a blade and that the groove has two parallel side walls, such that one of the side walls forms an acute angle and the other forms an obtuse angle.
    [0013]
    13. Method of assembling a hybrid earth drill drilling bit (11), the method characterized by the fact that it comprises the steps of: selecting one or more fixed blades (19), selecting one or more legs (17) from a plurality of prefabricated legs; selecting a drill body (13) from a plurality of prefabricated drill bodies, the drill body having a groove (123) for receiving the leg; screw the leg into the groove; and screwing a wedge (201), the wedge having at least one angle side, between the leg and a side wall of the groove, thus holding the leg inside the groove without welding; wherein one or more legs resist radial removal from the corresponding groove; select at least one rolling cutter (21) and mount each rolling cutter on one of the respective legs (17).
    [0014]
    14. Method according to claim 13, characterized in that tightening a screw through the wedge presses the leg against the side wall of the groove.
    [0015]
    15. Method, according to claim 13, characterized by the fact that it also includes positioning the wedge immediately beside an acute angle face of the leg.
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-10-29| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-06-02| B09A| Decision: intention to grant|
    2020-09-29| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 07/02/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US201161441907P| true| 2011-02-11|2011-02-11|
    US61/441,907|2011-02-11|
    PCT/US2012/024134|WO2012109234A2|2011-02-11|2012-02-07|System and method for leg retention on hybrid bits|
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