An earth-boring tool may include a body and at least one rotatable cutting structure assembly. The rotatable cutting structure assembly may include a leg, a rotatable cutting structure rotatably coupled to the leg, and a resistance actuator configured to impose rotational resistance on the rotatable cutting structure relative to the leg. An earth-boring to may include a plurality of rotatable cutting structure assemblies coupled to the bit body and a plurality of blades coupled to the body. A method of drilling a borehole may include rotating an earth-boring tool within the borehole, causing rotational resistance to be imposed on at least one rotatable cutting structure of the earth-boring tool, causing a blade of the earth-boring tool to be pushed into a sidewall of the borehole, and side cutting the sidewall of the borehole with the blade.

A method and device for setting expansion anchors that includes an elongate rod having a proximal end, a center section, and a distal end. The proximal end and the center section can have an effective diameter of a given expansion anchor. The distal end can have a reduced effective diameter to fit inside the open center space of the given expansion anchor.

A method and device for setting expansion anchors that includes an elongate rod having a proximal end, a center section, and a distal end. The proximal end and the center section can have an effective diameter of a given expansion anchor. The distal end can have a reduced effective diameter to fit inside the open center space of the given expansion anchor.

The invention relates to a cutter holder (1) for a tunnel boring machine, comprising: a housing (2) comprising two cavities (26) formed in opposite walls (20), and two clamping sets (3), configured to be removably mounted on either side of the roller cutter (10) in the housing (2), and each comprising: a base plate (32), and a center wedge (34), movably mounted on the base plate (32), two side wedges (36), hinged between the base plate (32) and the center wedge (34) between a retracted position and a clamping position, wherein the side wedges (36) transversely swing and enter into the cavity (26) facing the housing (2).

The invention relates to a cutter holder (1) for a tunnel boring machine, comprising: a housing (2) comprising two cavities (26) formed in opposite walls (20), and two clamping sets (3), configured to be removably mounted on either side of the roller cutter (10) in the housing (2), and each comprising: a base plate (32), and a center wedge (34), movably mounted on the base plate (32), two side wedges (36), hinged between the base plate (32) and the center wedge (34) between a retracted position and a clamping position, wherein the side wedges (36) transversely swing and enter into the cavity (26) facing the housing (2).

A hybrid drill bit includes both fixed cutting elements and an adjustable cutting structure thereon. An adjustment mechanism is provided to allow an axial position of cutting elements at a leading end of the adjustable cutting structure to be adjusted with respect to an axial position of the fixed cutting elements. The adjustable cutting structure may include counter rotational cutting members mounted obliquely with respect to a bit body rotational axis, and the adjustment mechanism may dynamically support the adjustable cutting structure such that the axial position of the cutting elements may be adjusted as the drill bit is in operation within a wellbore. The axial position may be adjusted by altering a weight applied to the drill bit within the wellbore.

A hybrid drill bit includes both fixed cutting elements and an adjustable cutting structure thereon. An adjustment mechanism is provided to allow an axial position of cutting elements at a leading end of the adjustable cutting structure to be adjusted with respect to an axial position of the fixed cutting elements. The adjustable cutting structure may include counter rotational cutting members mounted obliquely with respect to a bit body rotational axis, and the adjustment mechanism may dynamically support the adjustable cutting structure such that the axial position of the cutting elements may be adjusted as the drill bit is in operation within a wellbore. The axial position may be adjusted by altering a weight applied to the drill bit within the wellbore.

A downhole tool includes a fastening assembly securing one component to another component. The fastening assembly may include a threaded fastener located in an aperture of one component and a locking mechanism located in a cavity proximate the aperture. The threaded fastener may include a flange including mutually spaced holes located circumferentially within an outer periphery of the flange. The locking mechanism may include a spring and a dowel member. The locking mechanism may be positioned within a hole of the flange and may be configured to retain the threaded fastener in a fixed position relative to one component. Methods include using a depressor ring including teeth corresponding to the holes of the flange to depress the locking mechanism into the cavity while tightening the threaded fastener.

A downhole tool includes a fastening assembly securing one component to another component. The fastening assembly may include a threaded fastener located in an aperture of one component and a locking mechanism located in a cavity proximate the aperture. The threaded fastener may include a flange including mutually spaced holes located circumferentially within an outer periphery of the flange. The locking mechanism may include a spring and a dowel member. The locking mechanism may be positioned within a hole of the flange and may be configured to retain the threaded fastener in a fixed position relative to one component. Methods include using a depressor ring including teeth corresponding to the holes of the flange to depress the locking mechanism into the cavity while tightening the threaded fastener.

Hardfacing materials include a polymer matrix material and particles of hard material embedded within and dispersed throughout the polymer matrix material. Earth-boring tools include a tool body and a hardfacing material on at least a portion of a surface of the body, wherein the hardfacing material includes a polymer matrix material and particles of hard material embedded within and dispersed throughout the polymer matrix material. Methods of applying hardfacing material to an earth-boring tool comprise mixing hard particles with a polymer precursor material to form a paste, applying the paste to a surface of an earth-boring tool, and curing the polymer precursor material to form a hardfacing material on the surface of the earth-boring tool.