58results about "Conical drills" patented technology

A ceramic drill bit comprising a cylindrical shank and a shaped portion extending axially in line with the shank and having a free end forming the tip of the bit, a relief face extending from each main cutting edge with a relief angle lying in the range 4° to 10° approximately relative to a plane perpendicular to the axis of rotation of the bit, and two notches forming two secondary cutting faces extending from the central edge with positive cutting angles lying in the range 10 to 70 approximately relative to the axis of rotation of the bit.

An endodontic file (200) is provided particularly adapted for the removal of tooth structure, decayed or damaged nerve tissues or dentine material on the interior walls of a root canal or dentine and/or enamel from the external tooth wall. The endodontic instrument includes a shaft (202) having a shank portion (204) and a generally elongated working portion (206). The working portion preferably includes cutting or abrading features (232) adapted upon rotation and/or reciprocation of the instrument to cut, abrade or remove tissue from the interior walls of a root canal or dentine and/or enamel from the external tooth wall. The working portion extends from a proximal end (207) adjacent the shank portion to a distal end (208) terminating at a tip (250). The entire instrument and/or at least the working portion thereof is formed of an amorphous or essentially amorphous material having no or essentially no detectable crystalline structure and/or from a nanocrystalline material having an average crystalline grain size less than about 1 μm. The instrument may be formed by conventional grinding operations or by direct casting, forging or molding, in a manner producing an integral as-molded instrument having one or more sharp cutting edges. The instrument is inexpensive to manufacture and exhibits improved cutting-edge sharpness, wear resistance, lubriciousness and resistance to breakage.

A bit for removing a broken fastener comprises a tip from which extend two or more notches separated by scraping surfaces formed from two-sided frusto-conically-shaped regions. The scraping surfaces are bounded on one side by a cutting edge and on the other side by a non-cutting edge and are configured to cut into the fastener when the bit is rotated in a direction opposite to the fastener's direction of engagement. Specific embodiments include configurations where the cutting edges extend at different angles with respect to the bit axis and where the scraping surfaces comprise a plurality of serrations.

This document provides orthopedic and dental devices and methods for their use. For example, novel bone drills and dental drills are described. The bone and dental drills have at least some centers of mass that are offset from the drills' axis of rotation. Accordingly, the bone and dental drills may rotate and cut using a precessional pattern of motion. The design facilitates bone cutting, chip formation and hauling capacity, irrigation and bone harvesting. In some embodiments, the bone chips are collected in a removable apparatus fixed to the distal portion of the drill, and the collected bone chips can be used for bone grafting.

A bit for removing a broken security fastener having an elongated shaft with a longitudinal axis. The shaft has a first end and a second end. The first end terminates in a tip region having a recess for receipt of the post of the security fastener, the recess being disposed substantially along the longitudinal axis. The second end of the shaft is configured to be received by the chuck of a tool which provides rotational torque.

The invention discloses a self-cooling type drill bit. A cavity is formed in the drill bit. The drill bit comprises a drill bit body at the top, a drill rod in the middle and a connecting portion with the tail pivoted to a drill bit seat. The drill bit body is in an inverted conical shape. The drill rod is in the shape formed by connecting at least two inverted circular truncated cones. The drill bit body and the drill rod are provided with multiple holes communicating with the cavity in the drill bit. A pivot joint segment body is connected with two pipes extending outwards, namely the grinding aid liquid pipe and the cooling gas pipe. The outer portion of the cooling gas pipe is connected with an air compressor. The outer portion of the grinding aid liquid pipe is connected with grinding aid equipment. The drill bit integrates drilling, lubricating and cooling, lubricating can be conducted while drilling, and no extra cooling and lubricating device needs to be designed for drilling equipment, so that the drill bit equipment is simplified. When the drill bit works, drilling and grinding efficiency can be improved through grinding aid, and the edges of drilled holes are smooth and not sharp and coarse.

The illustrative embodiment of the present invention uses a tangible three-dimensional structure as a fiducial mark, which structure is, at least partially, tolerant of dimensional variations in the article. The illustrative embodiment uses three such tangible three-dimensional structures: (1) a portion of a tangible conical surface, (2) a portion of a tangible spheroidal surface, and (3) a portion of a tangible pyramidal surface.

An orthopedic screw extractor device including a shaft, an end portion about a first end of the shaft for securing to a handle, and a screw extracting tip about a second end of the shaft opposite the first end. The screw extracting tip further includes a generally frustoconical shape having a side at an angle of about 5 to 15 degrees relative to a longitudinal axis of the screw extracting tip. The screw extracting tip further includes first, second and third screw threads and first, second and third flutes circumferentially spaced about the screw extracting tip and extending across an entire length of the screw extracting tip. Each of the screw threads has a lead of about 0.07 to 0.12 inches, a pitch of about 0.02 to 0.04 inches, a thread angle of about 40 to 50 degrees, and a depth of about 0.01 to 0.02 inches.

A bit for removing a broken fastener comprises a tip from which extend two or more notches separated by traction or biting surfaces formed from two-sided frusto-conically-shaped regions. The surfaces are bounded on one side by a nonlinear cutting edge and on the other side by a non-cutting edge and are configured to cut into the fastener when the bit is rotated in a direction opposite to the fastener's direction of engagement. Specific embodiments include configurations where the cutting edges extend at different angles with respect to the bit axis, where the biting surfaces comprise a plurality of serrations, and where the cutting edges are separated by flutes which spiral along a longitudinally extending periphery of the bit.

The invention discloses a tapered step drill which comprises a drill, a drill handle and a tapered main body, wherein the tapered main body comprises a plurality of step sections which are connected in sequence from top to bottom; each step section comprises cylindrical main bodies and an inverted truncated conical secondary body, the cylindrical main bodies are arranged in sequence from top to bottom, central axes of the inverted truncated conical secondary body and the cylindrical main bodies are on the same straight line, the top surface of the inverted truncated conical secondary body is connected with the bottom surfaces of the cylindrical main bodies, the areas of the top surface of the inverted truncated conical secondary body and the bottom surfaces of the cylindrical main bodies are equal, thread through holes along the central axes are formed in the step sections, a threaded hole is formed in the drill, one end of the drill handle is used for connecting a clamping device, threads are formed on the other end of the drill handle, one end, which is provided with the threads, of the drill handle penetrates through the plurality of step sections in sequence, and the end of the drill handle is screwed in the threaded hole. According to the tapered step drill, the drill, the drill handle and the tapered main body are not integrated, additionally, the tapered main body is composed of the plurality of step sections, and when partial step sections are damaged, only the corresponding part needs to be replaced, so that resources are saved.

The present invention provides a twist drill. A cone portion is provided at a front end of the operating portion, and an exterior surface of the operating portion is provided with a spiral flute for shunting cutting chips. The exterior surface of the cone portion is provided with a plurality of composite cutting blade groups which are sequentially enlarged in diameter from the front end to the rear end of the cone portion. The cone portion is provided with a top blade on the tip. In use, the top blade is used for positioning, and the cutting process is carried out by the top blade and the composite cutting blade groups.

The invention relates to a drill bit used in CFRP drilling to reduce the defects in the process of CFRP machining. The drill bit comprises 1-drill body, 2-blades, 3-air suction duct, 4-chisel edge, 5-main cutting edge, 6-main rake face, 7-first main flank face, 8-second main flank face, 9-first minor cutting edge, 10-first minor rake face, 11-first minor flank face, 12-second minor cutting edge, 13-second minor rake face, 14-second minor flank face, 15-screw and 16-cutting at chisel edge. The effects of tearing, burrs, delamination and thermal damage during machining can be achieved, and the machining cost can be reduced by the replaceable blades.