Abstract: An engine stop switch and a fuel open-close lock are accommodated in a throttle lever case so that they can be easily disassembled, and the engine stop switch is turned on and off and the fuel open-close cock is opened and closed adequately by the actuation of a rotary valve in response to the turning of a lever. An engine stop switch and a fuel open-close lock are integrally incorporated in a throttle lever case, a partially toothless driven gear is intermittently rotated via a partially toothless drive gear rotated by a lever, and the intermittent rotation of the partially toothless driven gear turns on/off the engine stop switch and opens/closes the fuel open/close cock.

Abstract: The present invention provides a protective cover structure for a rammer for which a guard cover plate of a power engine in a rammer is molded from a synthetic resin allowing any shape to be freely obtained and having small weight, high strength, and impact absorption ability. The cover plate is configured so that it can be assembled and disassembled by simple operations, has good endurance with respect to severe vibrations and can reduce the damage of the machine body due to the adequate impact absorption ability even when the rammer tumbles. Front end sections of guard covers disposed on both sides of a power engine are joined and fixed to the front surface section of the crank chamber, lower sections of the rear portions are supported by support frames of a protective stand provided at the lower surface of the power engine, and the rear sections of the rear portions are linked integrally by a linking transverse pole.

Abstract: An engine stop switch and a fuel open-close lock are accommodated in a throttle lever case so that they can be easily disassembled, and the engine stop switch is turned on and off and the fuel open-close cock is opened and closed adequately by the actuation of a rotary valve in response to the turning of a lever. An engine stop switch and a fuel open-close lock are integrally incorporated in a throttle lever case, a partially toothless driven gear is intermittently rotated via a partially toothless drive gear 4 rotated by a lever 6, and the intermittent rotation of the partially toothless driven gear turns on/off the engine stop switch and opens/closes the fuel open/close cock.

Abstract: In a vibration compaction machine such as a rammer, a lining wear dust is prevented from accumulating inside a clutch drum due to oblique attachment of a centrifugal clutch, such that the input shaft side is high and the output shaft side is low because of a forward tilted posture of the machine body. Discharge ports for a lining wear dust are opened with a spacing therebetween in a corner section of a disk-shaped wall surface and an annular circumferential surface of a clutch drum in a centrifugal clutch that is disposed obliquely so that the input shaft is high and an output shaft is low, the discharge ports being obtained by cutting out portions of the annular circumferential surface close to the corner section.

Abstract: In a conventional operating handle for an operating machine, the two ends of a vibration-proof rubber are sandwiched between a handle rod and a grip bar, thereby connecting the handle rod and grip bar. The vibration of the handle rod is absorbed by the torsion of the vibration-proof rubber. As a result, the vibration of the handle rod can only be reduced rather than eliminated. In the present invention, a grip bar is attached rotatably to the upper end of a handle rod so as to be capable of a rocking motion, and the swing shock generated when the grip bar oscillates is absorbed by a stopper rubber provided on the handle rod. Thus the vibration of the grip bar can be absorbed efficiently by the rockable rotatably attached portion and the stopper rubber.

Abstract: A travel control device for vibrating plate compactor which can easily switch the travel direction of a large sized compactor weighing more than 500 kg by a hydraulic pump circuit having a servo valve to supply pressure from outside for switching the travel direction in order to shift the rotational phase of one of the rotors in the vibration generator. The travel control device receives the mechanical return force from the vibration generator at one end thereof in the cylindrical body and is provided at other end with a piston positioned to receive the pressure oil from an outside hydraulic pump, a push rod to operate said piston inserted into the other end of the body from outside, and a spool for servo valve at the side opposite to the side receiving said mechanical return force of said piston to supply the pressure oil from said hydraulic pump by operating said push rod.

Abstract: A method for producing 2-keto-L-gulonic acid (hereinafter referred to as 2KGA) which comprises(1) culturing a microorganism capable of producing 2KGA from L-sorbose, in a liquid culture medium containing a substrate to produce 2KGA and(2) recovering the produced 2KGA, while recovering the microorganism in the culture broth,(3) inoculating the recovered microorganism to a new liquid culture medium for the following culture and(4) repeating said culture and recovering at least once.The present invention provides an industrially advantageous, versatile method for producing 2KGA that shortens the overall culture time, and reduces the amounts of starting medium materials and culture waste.