A bit synchronizer for producing a clock signal and synchronizing the clock signal to a digital data stream. The digital data stream is used to generate first and second bit rate clocks, each of which have a clock cycle time equal to one bit time. The first bit rate clock is input to a phase lock-looped for comparison with an internally generated clock. The internally generated clock, once phase locked with the first bit rate clock, controls a sampler that decodes the digital data stream. The lo...

A drill bit for use in a drill string comprising a set of a plurality of central rod members and a set of a plurality of tubular members surrounding said rod members. The drill bit is provided with a longitudinally extending flushing channel which communicates with an annular space between the rod members and the tubular members via a transverse passage. The flushing channel comprises at least two end passages terminating in the bit front. The cross section area of each of the end passages is sm...

A bit holder for a ploughing bit of a coal or extraction plough includes an insert pocket open on the top side for receiving a bit shank formed on the ploughing bit. The pocket is bounded by two lateral supporting walls, a front and a rear supporting wall, whereby the rear supporting wall has an elevated section projecting over the adjoining, lateral supporting walls. The rear supporting wall forming a bit support for the ploughing bit slopes down to its outer regions. In order to allow a good s...

The holder for the bit of a mining machine has a chamber with an open side for introduction of the shank of the bit. The shank fills the chamber and one of its lateral surfaces has a longitudinally extending groove whose height and/or width decreases from a front opening to a rear opening of the holder. The groove is filled by the stem of a key which holds the shank in the chamber. The rear end of the stem extends into the rear opening, and the front end of the stem extends forwardly through and...

A manicurist's bit for shaving away layers of an artificial fingernail. The bit comprises an elongated body portion having a right circular cross section, and has a plurality of angled knurls extending along the width of the body portion. In a preferred embodiment, one end of the body portion is concave. In operation, the bit is given a circular motion in the direction of the angle of the knurls, and is thereafter applied to the surface of the nail to be shaped. The bit shaves away portions of t...

A bridle bit for horses comprises a mouthpiece to be received in the mouth of a horse. A head stall ring member is rotatably mounted through the outward ends of the mouthpiece member has a portion extending through the mouthpiece outward ends secured to a cylindrical cheek piece member which rotates therewith. The cheek piece members extend forwardly from the outward ends of the mouthpiece member and reside closely adjacent the cheek of the horse and a rein ring member is rotatably mounted on ea...

A drill bit is provided which has a central tine and first and second cutting tines, provided one on each side of the central tine. The lowermost end of each of the cutting tines is sharpened for cutting the stock. Thus the drill bit cores the material to form a hole thereby reducing the amount of material that must be cutaway. Further, the cutting tines are formed so as to have an enlarged distal head so that the main body portion of each of the tines has a slightly smaller cross-section than t...

A high speed drill bit is formed of a longitudinal body designed to rotate about a longitudinal axis. Each flute has a leading edge with a positive rake angle and a trailing edge with a neutral or negative rake angle. The bit cutting face is formed by surfaces and cutting edges that are asymmetrical with respect to each other.

A bridle bit having an elongated mouthpiece pivotally attached at opposite ends to bridle rings permitting attachment of a bridle to the bit. The mouthpiece is constructed from a pair of longitudinally extending, substantially rigid arms, each connected to a respective one of the bridle rings, and connected to the arms by separate ball and socket joints permitting universal movement between the coupling member and the respective arms. Between the joints, the coupling member has a substantially c...

An improved router bit that has numerous advantages over conventional router bits; the bit of the present invention allowing chips to fall through quite readily, making a smoother cut and having other advantages; the bit having two or more flutes, one of the flutes having a cutting edge with a radius of conventional bits, the other flute or flutes being radially shorter, thus giving such flute or flutes a less circular limit.