A two-stage gas regulator for liquefied-gas containers includes a lower body and an upper cover with a mediate plate disposed therebetween. The lower body has a plurality of inlet ports respectively in fluid communication with a corresponding liquefied-gas container, a first pressure-reduction chamber selectively in fluid communication with one of the inlet ports under control of a switch, a second pressure-reduction chamber in fluid communication with the first pressure-reduction chamber, and a...

An earth-boring bit has a bit body, at least one cantilevered bearing shaft, including a base and a cylindrical journal bearing surface extending inwardly and downwardly from the bit body, and at least one cutter mounted for rotation on the cylindrical journal bearing surface of the bearing shaft. A seal assembly is disposed between the cylindrical journal bearing surface and the cutter proximally to the base of the cantilevered bearing shaft. The seal assembly includes at least one rigid seal r...

Apparatus and method for selectively determining the resonant frequency of a gas compressor including a compressor drive motor and a muffler in a generally spaced relationship, and an apparatus mechanically linking the compressor drive motor and the muffler. The apparatus as disclosed in one embodiment includes two conical frustums as wedge members, each having an axial bore accommodating a single non-resilient shaft for joining the conical frustums such that the shaft may be adjusted to force t...

An exhaust pipe for connection to an exhaust pipe of an engine to filtrate dirt from exhaust gas comprises therein a center shaft having connected thereto a turbine vane and a filter device in series. Exhaust gas from engine turns the turbine vane to cause the filter device to rotate so as to efficiently filtrate impurities from exhaust gas.

A vertebral locking and retrieving system comprises at least one lock pin, a coupling component, a remedial component, and a plurality of locking components. The lock pin is composed of a threaded end portion and a receiving mount, which form therebetween a specified angle. The coupling component is connected at one end thereof to the receiving mount of the lock pin. The remedial component is secured at one end thereof to the deformed vertebra or to the upper vertebra or the lower vertebra immed...

A vertebral locking and retrieving system comprises at least one locking pin assembly, a coupling component, a remedial component, and a plurality of securing components. The locking pin assembly is composed of a threaded pin, a receiving mount and a bolt for fastening the threaded pin and the receivng mount together wherein the threaded pin and the receiving mount form therebetween a specified angle. The coupling component is connected at one end thereof to the receiving mount of the locking pi...

A vertebral locking and retrieving system comprising a locking pin, a connector, a locking component, a coupling component, a remedial component, and securing components is disclosed. The locking pin includes a threaded end and a locking end. The threaded end is adapted to be secured to a normal, healthy vertebra. The connector comprises an internally threaded bore at one end and an integrally formed plate at the other end thereof. The plate has a locking aperture adapted to non-rotatably accept...

A tubular body has rectangular-shaped slot formed in the top portion thereof, and matched eccentric convex protrusions are formed on both sides of the body. A core is provided with a concave-shaped groove on its surface that is matched with the slot, when the core is inserted into the body. A cable is connected to the core. A rear cup is tightly fitted to the rear end of the body for securing the cable that is disposed externally through the hole. An insulation shell is tightly shielded on the o...

A clamping device for a vertebral locking rod includes an outer clamping member and an inner clamping member. The outer clamping member has a U-shaped clamping mount provided respectively in both inner sides thereof with a fitting member, with at least one of the two inner sides having a retainer. The inner clamping member has an arcuate fastening mount and a fastening block provided respectively in both outer sides thereof with a fitting member engageable with the fitting member of the outer cl...

A water heater according to one embodiment of the invention includes a housing, a heating unit, and a pre-heating unit consisted of a transformer, a transistor, a heating coil, a rectifier that release heat for heating water when operated, the heating unit including a magnetic device and two stainless steel plates insulated from the magnetic device at two opposite sides, the stainless steel plates being heated by the magnetic force from the magnetic device to heat water passing through.