Abstract: An oil injection type screw compressor which includes an oil tank for separating lubricating oil from gas discharged from a compressor body and collecting the thus separated lubricating oil is constituted such that the oil tank has a substantially L-shaped vertical section composed of a base portion and a column portion provided uprightly on the base portion such that a spacing in the base portion located above an oil storage portion at a lower location in the base portion is formed such that it extends from an upper portion in the base portion to the inside of the column portion, and an oil separating element is provided on the inner side of an exit of gas at an upper portion of the column portion while the compressor body is disposed on the base portion.

Abstract: To enable the prevention of smearing an equipment and its periphery with lubricating oil, the alleviation of a burden in maintenance of the equipment by reducing a decrement of the lubricating oil, and the lowering of running cost, an oil-cooled compressor has a suction control valve 5 in a suction passage 3 and an air discharge valve 9 in a discharge passage 6 in a compressor body 1. An oil discharge passage 16 is formed for leading outside the lubricating oil supplied to bearing and shaft seal sections of the compressor body 1, an oil return passage 17 communicating with the inlet side of the suction control valve 5, an oil reservoir section 18 located between the oil discharge passage 16 and the oil return passage 17, and an air discharge passage 19 arranged with one end connected to the outlet port of the air discharge valve 9 and its another end reaching the oil reservoir section 18.

Abstract: An oil cooled compressor includes a compressor body having a low pressure suction passage and a high pressure discharge passage. An oil tank is mounted to the discharge passage such that oil and drain water separated from a compressed gas in the discharge passage collect in the oil tank with water at a lowermost part of the oil tank. A drain water passage separate from a compressed gas discharge passage and an oil discharge passage, connects the lowermost part of the oil tank with a portion of the compressor body which is substantially at the low pressure. Drain water is thereby evaporated from the oil tank and returned to the compressor body.

Abstract: In a press machine provided with a power transmission device (1) for transmitting the driving force of the press body to a transfer feeder device, on the occasion of the recoupling of the power transmission device (1) at the exchange of a mold or the like, a motor (8) for rotating the shaft of the power transmission device (1) is driven in the forward or reverse direction so that the feeder angle (F) coincides with the crank angle (P) of the press. At the moment when the difference (P-F) between said angles enters within a predetermined range (A), the power transmission device (1) is coupled. Thus, it is possible to automatically couple the power transmission device simply and with high accuracy.

Abstract: Disclosed is a screw type mechanical supercharger which is small in size but has a large capacity. The supercharger includes a pair of female and male screw rotors held in a mutully meshing condition with each other, and a pair of synchronizing gears mounted for integral rotation with the screw rotors and held in meshing engagement with each other to establish synchronous rotation of the female and male screw rotors. The female rotor has six teeth while the male rotor has three teeth, and the synchronizing gear for the female rotor has a number of teeth equal to twice that of the other synchronizing gear for the male rotor. The female rotor is connected to be driven by a reciprocating internal combustion engine so as to serve as an input power shaft of the supercharger. The screw rotors are preferably formed from a lighter weight material than the remainder of the supercharger.

Abstract: A screw supercharger is provided having a set of male and female screw rotors rotatably supported in a casing and driven through a wrapping transmission including belts and pulleys by a prime mover, wherein a through hole is formed in the wall of the causing at a position through which the input shaft of the screw rotor or the extension of the axis of the input shaft of the screw rotor extends, in that a cylindrical bearing supporting part is formed around the through hole so as to project outside from the casing, and in that a driven pulley is supported through bearings on the bearing supporting part and is fixedly mounted on the input shaft.

Abstract: For reducing vibrations having different frequencies and transmitted to a chassis of a vehicle, a vibration-proof apparatus mounted on a support member supporting a vibratory body on the chassis includes a first dynamic damper and a second dynamic damper secured to the support member, such dynamic dampers being arranged to absorb vibrations having different frequencies. The apparatus is particularly applicable to a subframe which undergoes vibrations from a differential device and from a propeller shaft.

Abstract: Described herein is a method for operating an oil-free screw compressor and an oil-free screw compressor construction, the method including the step of feeding a gas of a temperature Ta to a discharge space in the vicinity of the discharge port of the compressor, the temperature Ta satisfying the relationshipTa.ltoreq.Tl/kwherein Ta is the temperature (.degree.K.) of said feed gas; Tl is the temperature (.degree.K.) of the compressed gas before feeding; and k is a polytropic index number.

Abstract: An apparatus including a grip sensor for controlling the number of revolutions of an engine. The grip sensor detects whether or not fingers of an operator approach toward the grip sensor or the former come in contact with the latter. Usually, the grip sensor is incorporated in the gripping portion of a control lever which controls actuation of working tools. The apparatus includes a controller for outputting a deceleration signal in response to an output signal from the grip sensor in order to reduce the current number of revolutions of the engine to a level lower than the number of revolutions of the engine in the high operative state when no detection is achieved by means of the grip sensor. Alternatively, the controller may output an acceleration signal in response to an output signal from the grip sensor in order to raise the current number of revolutions of the engine to a level higher than that the engine in the idle rotational state when detection is achieved by means of the grip sensor.

Abstract: A pair of dry-sealed screw rotors for compressors which includes rotor tooth profiles in which an inter-tooth gap at a profile point on male and female rotor of a normal temperature is determined by an amount of interference due to thermal expansion caused during the operation of the compressors and an amount of minimum safety clearance necessary for the operation. The inter-tooth gap is further determined by a total thickness of seal coatings applied to the peripheral surfaces of the rotors at a profile point at which the thus determined gap is smaller than the total thickness of seal coatings. With the thus shaped rotor teeth, a most preferable seal line is achieved so as to produce an improved compression efficiency.

Abstract: A screw rotor mechanism which includes a female rotor F having tooth crests each being formed by a leading side arc g2-a2 overlying a tooth tip circle Cf thereof and a following side are a2-b2 having its center at a point 07 on a pitch circle Pf thereof, and a male rotor M having tooth tips each being formed by an arc c1-d1 having its center at an interaxial line passing through axes Of,Om of the female and male rotors F,M. The male rotor M also has tooth bottoms being complementary to tooth female tooth crests or tips and forms no seal grooves thereon. The thus shaped rotors are adapted to be machined with a high efficiency by a gear hobbing machine.

Abstract: Novel 3,5-di-tert-butyl-4-hydroxyphenyl-substituted heterocyclic compounds shown by the formula ##STR1## wherein .circle.Het -- represents a specific heterocyclic group and the salts thereof.The compounds have an anti-inflammatory, an anti-pyretic, an analgesic, an anti-arthritic, and an immunoregulatory activity. Hence, they are particularly useful as an antirheumatics.

Abstract: Nitrogen containing heterocyclic compounds shown by the formula ##STR1## wherein Y represents an oxygen atom, a sulfur atom, or a group shown by ##STR2## (wherein m is 1 or 2); n represents 0 or 1; R.sub.1 and R.sub.4, which may be the same or different, each represents a hydrogen atom, a lower alkyl group, or a lower alkenyl group; R.sub.2 and R.sub.3, which may be the same or different, each represents a hydrogen atom, a hydroxyl groups, a lower alkanoyloxy group, a lower alkyl group or a lower alkenyl group; said R.sub.2 and R.sub.3 may further form together a double bond; R.sub.5 and R.sub.6, which may be the same or different, each represents by hydrogen atom, a halogen atom, a hydroxyl group, a nitro group, an amino group, a lower alkoxy group, a mono or di lower alkylamino group, or a lower alkyl group; said R.sub.5 and R.sub.6 may further form together a lower alkylenedioxy group; and R.sub.

Abstract: Novel nitrogen-containing heterocyclic compounds shown by the formula ##STR1## wherein Y represents an oxygen atom, a sulfur atom, or a group shown by ##STR2## (wherein m is 1 or 2); n represents 0 or 1; R.sub.1 and R.sub.4, which may be the same or different, each represents a hydrogen atom, a lower alkyl group, or a lower alkenyl group; R.sub.2 and R.sub.3, which may be the same or different, each represents a hydrogen atom, a hydroxyl group, a lower alkanoyloxy group, a lower alkyl group or a lower alkenyl group; said R.sub.2 and R.sub.3 may further form together a double bond; R.sub.5 and R.sub.6, which may be the same or different, each represents a hydrogen atom, a halogen atom, a hydroxyl group, a nitro group, an amino group, a lower alkoxy group, a mono or di lower alkylamino group, or a lower alkyl group; said R.sub.5 and R.sub.6 may further form together a lower alkylenedioxy group; and R.sub.

Abstract: Novel nitrogen-containing heterocyclic compounds shown by the formula ##STR1## wherein one of R.sub.1 and R.sub.2 represents a lower alkyl group, a phenyl group, a halophenyl group, or a lower alkoxyphenyl group and the other of them represents a hydrogen atom, a lower alkyl group, or a phenyl lower alkyl group; said R.sub.1 and R.sub.2 may combine with each other to form a trimethylene group or a tetramethylene group; R.sub.3 represents a hydrogen atom, a lower alkyl group, a phenyl group, or a phenyl lower alkyl group; X represents an oxygen atom, a sulfur atom, an imino group, or a group shown by ##STR2## (wherein m represents 1 or 2 and R.sub.4 represents a lower alkyl group, a hydroxy lower alkyl group, a cycloalkyl group or a phenyl lower alkyl group); and Y represents an ethylene group which may be substituted by lower alkyl group, a trimethylene group, a tetramethylene group, a vinylene group which may be substituted by a lower alkyl group, or ##STR3## (wherein R.sub.

Abstract: Novel nitrogen-containing heterocyclic compounds shown by the formula ##STR1## wherein one of R.sub.1 and R.sub.2 represents a lower alkyl group, a phenyl group, a halophenyl group, or a lower alkoxyphenyl group and the other of them represents a hydrogen atom, a lower alkyl group, or a phenyl lower alkyl group; said R.sub.1 and R.sub.2 may combine with each other to form a trimethylene group or a tetramethylene group; R.sub.3 represents a hydrogen atom, a lower alkyl group, a phenyl group, or a phenyl lower alkyl group; X represents an oxygen atom, a sulfur atom, an imino group, or a group shown by ##STR2## wherein m represents 1 or 2 and R.sub.4 represents a lower alkyl group, a hydroxy lower alkyl group, a cycloalkyl group or a phenyl lower alkyl group; and Y represents an ethylene group which may be substituted by a lower alkyl group, a trimethylene group, a tetramethylene group, a vinylene group which may be substituted by lower alkyl group, or ##STR3## wherein R.sub.

Abstract: Novel nitrogen-containing heterocyclic compounds shown by the formula ##STR1## wherein one of R.sub.1 and R.sub.2 represents a lower alkyl group, a phenyl group, a halophenyl group, or a lower alkoxyphenyl group and the other of them represents a hydrogen atom, a lower alkyl group, or a phenyl lower alkyl group; said R.sub.1 and R.sub.2 may combine with each other to form a trimethylene group or a tetramethylene group; R.sub.3 represents a hydrogen atom, a lower alkyl group, a phenyl group, or a phenyl lower alkyl group; X represents an oxygen atom, a sulfur atom, an imino group, or a group shown by ##STR2## wherein m represents 1 or 2 and R.sub.4 represents a lower alkyl group, a hydroxy lower alkyl group, a cycloalkyl group or a phenyl lower alkyl group; and Y represents an ethylene group which may be substituted by lower alkyl group, a trimethylene group, a tetramethylene group, a vinylene group which may be substituted by a lower alkyl group, or ##STR3## wherein R.sub.

Abstract: Novel 1-oxo-1,2-dihydroisoquinoline compounds of the formula ##STR1## wherein R.sub.1 represents a lower alkyl group or a phenyl lower alkyl group; R.sub.2 represents a lower alkyl group; R.sub.3 represents a hydrogen atom, a lower alkanoyl group, a lower alkyl group or a hydroxy lower alkyl group; and n is 0, 1 or 2 and the pharmacologically acceptable non-toxic salts thereof.The compounds of this invention are strong analgesic anti-inflammatory agents.

Abstract: Novel nitrogen-containing heterocyclic compounds shown by the formula ##STR1## wherein one of R.sub.1 and R.sub.2 represents a lower alkyl group, a phenyl group, a halophenyl group, or a lower alkoxyphenyl group and the other of them represents a hydrogen atom, a lower alkyl group, or a phenyl lower alkyl group; said R.sub.1 and R.sub.2 may combine with each other to form a trimethylene group or a tetramethylene group; R.sub.3 represents a hydrogen atom, a lower alkyl group, a phenyl group, or a phenyl lower alkyl group; X represents an oxygen atom, a sulfur atom, an imino group, or a group shown by ##STR2## wherein m represents 1 or 2 and R.sub.4 represents a lower alkyl group, a hydroxy lower alkyl group, a cycloalkyl group or a phenyl lower alkyl group; and Y represents an ethylene group which may be substituted by lower alkyl group, a trimethylene group, a tetramethylene group, a vinylene group which may be substituted by a lower alkyl group, or ##STR3## wherein R.sub.

Abstract: Novel nitrogen-containing heterocyclic compounds shown by the formula ##STR1## wherein Y represents an oxygen atom, a sulfur atom, or a group shown by ##STR2## (wherein m is 1 or 2); n represents 0 or 1; R.sub.1 and R.sub.4, which may be the same or different, each represents a hydrogen atom, a lower alkyl group, or a lower alkenyl group; R.sub.2 and R.sub.3, which may be the same or different, each represents a hydrogen atom, a hydroxyl group, a lower alkanoyloxy group, a lower alkyl group or a lower alkenyl group; said R.sub.2 and R.sub.3 may further form together a double bond; R.sub.5 and R.sub.6, which may be the same or different, each represents a hydrogen atom, a halogen atom, a hydroxyl group, a nitro group, an amino group, a lower alkoxy group, a mono or di lower alkylamino group, or a lower alkyl group; said R.sub.5 and R.sub.6 may further form together a lower alkylenedioxy group; and R.sub.