Abstract: A crystal oscillator is provided to secure a space for housing the IC and electronic components, even if the vibrator is small in size. In this crystal oscillator, there is not a hindrance to the wire connections between the IC and the electronic components, and the limitation on the vibrator and oscillator design is reduced. Also, the influence of the heat from the IC and the electronic components is made smaller. Thus, desired characteristics can be readily achieved with this crystal oscillator. In this crystal oscillator, the IC and the electronic components are housed in a concave portion formed in the ceramic package. A pedestal formed with a crystal plate made of the same material as the vibrator is provided to cover almost the entire opening of the concave portion, and the vibrator is placed on the pedestal.

Abstract: A waterproof structure for a tightening section where a first member (1) having a screw hole (1a) with a bottom and a second member (2) having a screw insertion hole (2a) are fastened with a screw (4) that is inserted into the screw insertion hole (2a) and screwed to the screw hole (1a). The screw (4) is a flat head screw, and an annular groove (3b) is formed in the outer surface of a spacer (3) having an insertion hole where recessed circular conical surface (3a) is formed. The spacer (3) is fitted in the screw insertion hole (2a) to be in surface contact with a circular conical surface of a head of the flat head screw. The annular groove (3b) is coaxial with the recessed circular conical surface (3a).

Abstract: A crystal oscillator is provided to secure a space for housing the IC and electronic components, even if the vibrator is small in size. In this crystal oscillator, there is not a hindrance to the wire connections between the IC and the electronic components, and the limitation on the vibrator and oscillator design is reduced. Also, the influence of the heat from the IC and the electronic components is made smaller. Thus, desired characteristics can be readily achieved with this crystal oscillator. In this crystal oscillator, the IC and the electronic components are housed in a concave portion formed in the ceramic package. A pedestal formed with a crystal plate made of the same material as the vibrator is provided to cover almost the entire opening of the concave portion, and the vibrator is placed on the pedestal.

Abstract: A waterproof structure for a tightening section where a first member (1) having a screw hole (1a) with a bottom and a second member (2) having a screw insertion hole (2a) are fastened with a screw (4) that is inserted into the screw insertion hole (2a) and screwed to the screw hole (1a). The screw (4) is a flat head screw, and an annular groove (3b) is formed in the outer surface of a spacer (3) having an insertion hole where recessed circular conical surface (3a) is formed. The spacer (3) is fitted in the screw insertion hole (2a) to be in surface contact with a circular conical surface of a head of the flat head screw. The annular groove (3b) is coaxial with the recessed circular conical surface (3a).

Abstract: An arc welder comprising: a rectifier circuit 2 which rectifies an alternating current 1 to a direct current; an inverter circuit 3; a transformer 4; a second rectifier circuit 5 which rectifies an output of the transformer 4 to a direct current; and a first reactor 6 which is connected to the second rectifier circuit 5. The arc welder further has a current circuit 10 which is connected in parallel to the second rectifier circuit 5 with a reactance that is larger than the reactance of the first reactor 6.

Abstract: An arc welder comprising: a rectifier circuit 2 which rectifies an alternating current 1 to a direct current; an inverter circuit 3; a transformer 4; a second rectifier circuit which rectifies an output of the transformer 4 to a direct current; and a first reactor 6 which is connected to the second rectifier circuit 5. The arc welder further has a current circuit 10 which is connected in parallel to the second rectifier circuit 5 with a reactance that is larger than the reactance of the first reactor 6.

Abstract: An intermittent top firing tunnel kiln equipped with a burner having a ceramic air nozzle, in which an air nozzle assembly is mounted to a wind box adjacent to the burner tile through a burner support tile, said assembly being constructed by a metallic air supply pipe supported by a metal fixture at the ceiling portion of the kiln and being connected at the tip of said pipe to the ceramic air nozzle, and in which an oil nozzle is disengagably provided at the center in said air nozzle assembly, whereby the secondary air for combustion is supplied to said wind box through the walls of the kiln.

Abstract: A tunnel kiln for use in rebaking carbonaceous moldings impregnated with tar, pitch or the like, consisting of a preheating zone, a baking zone and a cooling zone, which comprises providing arch shafts in the kiln ceiling, providing a plurality of gas recirculating devices communicating with said arch shafts and heating gas blow-in holes of the lower portion of side wall in the preheating zone and the baking zone, and further providing, above the heating gas passages or combustion chambers mounted on a number of connected kiln cars, muffles consisting of receiving plate, bottom plate, holder, cover having in its upper surface a number of tar gas discharge openings, and seal, which muffles accommodating said moldings to be rebaked.

Abstract: A method and apparatus for the continuous baking of preheating, burning and cooling of carbonaceous moldings, which comprises burning fuels at the side and bottom portions of saggers which are charged with breeze and carbonaceous moldings to be baked; movably arranging a MOBAC [Mobile Baking Chamber] beneath a fixed ceiling having a combustion device and a gas recirculation system, in which MOBAC a baking chamber and a gas flue of refractory material are provided which pass combustion gas, heating gas or cooling gas; sealing the space between the fixed ceiling and the MOBAC and the upper contact surface of each MOBAC from atmospheric air; and connecting a number of said MOBAC in a row and moving them beneath the fixed ceiling.