A rotary bit for oil and gas well drilling has cutting elements (1) set in a hard facing material (3) which in turn is supported by a sintered steel section (4) between the hard facing and the steel base (7) of the bit.

PURPOSE:To eliminate retreat with simple constitution by controllably feeding back the transmission torque of a clutch for a vehicle in the direction of reducing vehicle speed when both proceeding direction of speed change range and direction of a vehicle are different from each other in the fully closed opening of a throttle under a non-braked condition. CONSTITUTION:An engine 10 is rotatably con...

PURPOSE:To reduce noises of an engine by operating a motor to protrude a screw shaft when a high speed travelling condition is detected from a speed change lever position and regulating an arm swinging amount responsive to the pedaling of an accelerator pedal to limit an acceleration operating amount and set the rotational frequency of engine less than the upper limit. CONSTITUTION:When the lever ...

PURPOSE:To increase the degree of freedom of lay-out by connecting a variable capacity type swash plate system hydraulic motor adjacent and coaxially with a swash plate system hydraulic pump rotated by a prime mover with one of output shafts of hydraulic motor extending through the pump and the output shafts being disposed on both sides of a seed change unit. CONSTITUTION:An input tubular shaft 5 ...

PURPOSE:To dispense with any braking during stoppage as well as aim at runaway prevention at time of nonbraking by installing a solenoid valve, whose current flows into one side at time of current-energizing and both sides at the time of unenergizing, between master and wheel cylinders, and connecting it to both car speed and accelerator sensing switches in series. CONSTITUTION:When a brake pedal ...

A method of forming edges on contact lenses prepared from laser-machinable, organic polymers wherein the edge is formed by contacting the lens with a laser beam having a wavelength which is absorbed by the polymer. The radiated energy supplied to the polymer by the laser beam is such that the ratio of heat absorbed in vaporization of the polymer to heat absorbed by the polymer bulk is maximized.

A rack (28) which supports the beads (12) in a separated condition is transported to the storing and feeding apparatus (10) where the rack (28) is used to place the beads (12) around a plurality of continuous conveyors (20) which are expanded to grip the beads (12). After the rack (28) is removed from the feeding and storing apparatus (10), the conveyors (20) are actuated to simultaneously and int...

An open celled, dimensionally stable, flexible urethane foam and method of preparing such foam, which method comprises adding a cell opening dimensionally stabilizing amount of an additive to a foamable urethane composition, and thereafter foaming the composition containing such additive to provide a dimensionally stable, flexible urethane foam product. The additive mixture employed comprises an e...

A method of scanning a web material and an apparatus for use in the method in which a web material is spatially divided into smaller divisions in a scanning direction while being scanned in the direction of a width thereof with a scanning beam moved by means of a polyhedral mirror with a constant speed of rotation. Clock pulses from a pulse generator are counted up by a counter to access division ...

A portable analyzer is disclosed. The analyzer comprises in combination a housing, an optical system comprising a light source, a detector, and one or more means for activating the optical system in generating a signal in response to a test element, means for manually moving the test element from a first position to a second position corresponding to a point of initiation of an operative condition...

PURPOSE:To use a planar sound source to extend the life thereof and to obtain a sufficient shock wave, by using an induction type transmitter as the sound source. CONSTITUTION:The probe part bonded to an object under pressure consists of a vibration plate 10 composed of a circular non-magnetic conductive plate and the spiral coil 12 provided in close vicinity thereto. The coil 12 is connected to a...

PURPOSE:To enhance treatment capacity be employing ultrasonic vibration, by providing a lateral vibration generating part converting the longitudinal vibration of a vibration transmitting member to lateral vibration to the vibration transmitting member. CONSTITUTION:A probe 8 generates longitudinal vibration X by the ultrasonic vibration generated in an ultrasonic vibrator 2 and said longitudinal ...

PURPOSE:To eliminate danger such that a blood vessel is punctured by laser beam and to sufficiently delate a constriction part, by mounting a leading end tip having a leading end part heated by laser beam and a cutter driver so as to slide to remove an object to be removed. CONSTITUTION:Laser beam irradiates and heats the leading end part 14 of the leading end tip 11 position in front of an optica...

The specification discloses a surfactant composition for rigid urethane, including isocyanurate foams which includes from about 15 to about 50% each of the following ingredients: (1) an organic surfactant; (2) a siloxane-polyoxyalkylene surfactant; and (3) one of water, C-1 to C-3 alcohol and mixtures thereof.

A centralizing device for use down-well in maintaining a sensor or other operational tool in a location accurately centralized on the axis of the bore-hole irrespective of the angular orientation of the device and associated tool at any given location. The device includes an elongate member carrying at angularly spaced locations three two pairs of opposed, two-arm linkages, each arm of each linkag...

A hydropneumatic brake actuator having a friction member positionable by a power piston during a brake application stroke through a lost-motion connection therewith to establish a stop to limit return movement of the power piston during a brake release and thereby provide a predetermined brake shoe clearance. The friction member comprises an elastomeric-type O-ring that can be compressed axially t...

Disclosed is a film for a printer ribbon, which is made of a resin composition comprising, 55 to 95% by weight of high-density polyethylene and 5 to 45% by weight of low-density polyethylene and having a melt tension of at least l.4 g and a density of 0.94 to 0.96 g/cm<3>. The film is made by the T-die-chill roll method wherein a good stability at both ends of the extruded molten resin film is mai...

A fluid bed reactor for treatment of refractory materials with a hot fluidizing gas and a method to use same. Both the refractory materials and the fluidizing gas are introduced from the top of the reactor. Unusually high reaction temperatures of up to 2000 DEG C. are maintained in the reaction chamber due to the presence of heating elements within the reactor and due to countercurrent heat trans...

A polycarbonate film obtained by dispersing carbon black in a solution of thermoplastic aromatic polycarbonate, producing a cast film, and subsequently stretching the cast film, is characterized in that its elongation at break is greater than that of a corresponding unstretched similarly filled film having an identical thickness.