Abstract: A tennis racket frame comprising a string-installing portion (10), T-shaped in cross section, formed along the entire periphery of a ball-hitting surface thereof. The string-installing portion (10) comprises a projection (20) formed toward the ball-hitting surface in which strings are installed and a base (21) perpendicular to the projection (20). A plurality of gut holes (25) are formed on the projection (20) such that each of the gut holes (25) penetrates through the center thereof. A plurality of gut holes (24) is formed on the bottom surface of a concave (23) of the base (21) such that each of the gut holes (24) penetrates through the center of the base (21).

Abstract: A luminescent sheet for stamps comprising a subtrate and a luminescent layer formed on the surface of said substrate, characterized in that said luminescent layer contains fine particles of an inorganic fluorescent pigment, said fine particles being prepared by providing a dispersion containing particles having a mean specific surface area Sw.sub.2 of said inorganic fluorescent pigment in water, and subjecting said dispersion to wet-grinding to obtain an aqueous dispersion containing fine particles having a mean specific surface area Sw.sub.1 of said inorganic fluorescent pigment, and said fine particles satisfying the equation: 2.0.gtoreq.Sw.sub.1 /Sw.sub.2 .gtoreq.1.05.

Abstract: A high quality coated paper for printing having excellent smoothness, gloss and printability is provided by using a coating composition mainly composed of a pigment and a latex of heterogeneous polymer particles consisting of a hard polymer domain having a glass transition temperature of 80.degree. to 220.degree. C. and a soft polymer domain having a glass transition temperature of 25.degree. to 95.degree. C. in combination with a high temperature calender finishing.

Abstract: A method of manufacturing gloss coated paper by applying a coating composition containing a pigment and an adhesive on base paper. The pigment contains 5 to 40% by weight of satin white with an average particle diameter of 0.8 .mu.m or below and an organic pigment with an average particle diameter of 0.1 to 1.0 .mu.m and a glass transition point (Tg) of 40.degree. C. or above. The weight ratio of the satin white to the organic pigment is from 0.2/1 to 5/1. The coating composition provides a coated paper with excellent gloss and smoothness.

Abstract: A vane compressor has a vane back pressure adjustment device including back-pressure chambers defined in a vane-supporting rotor and surrounded by vanes and side blocks secured to axial ends of a cylinder. The back-pressure chamber has axial ends disposed to follow a path against each of the side blocks when the rotor rotates. The path is divided into at least one high-pressure zone in which the vanes move across a pump outlet defined in the cylinder, and at least one normal-pressure zone which is the remainder of the path. In the normal-pressure zone, oil grooves defined in surfaces of the side blocks which face the rotor and supplied with oil from an oil sump in the vane compressor are in communication with the back-pressure chambers, to thereby maintain the oil pressure in the back-pressure chambers at a pressure level in the oil sump.

Abstract: The present invention relates to an ink applying method for obtaining desired sharp patterns while preventing bleeding and an ink composition therefor, in applying a low viscosity liquid to a polymer product such as fabric in the form of droplets according to the ink jet or spray process.As a treating solution there is used a solution incorporating a water-soluble or water-dispersible material which contains --OSO.sub.3 M group or --SO.sub.3 M group as a hydrophilic group in which M is a monovalent metal, ammonium or amine, and a fiber structure is pretreated with a chemical for coagulating the said hydrophilic group, whereby good bleeding preventing effect and deep shading effect even against markedly bleeding fiber structures such as thin fabrics as well as level dyeing effect of colored portions can be attained without impairing the injection characteristic. Sharp patterns equal or superior to conventional prints can be obtained.

Abstract: In a refrigerant compressor, a driving shaft is rotatably supported within a compressor housing by a bearing on a suction side. A trigger valve is provided in a passageway communicating a discharge pressure chamber with the bearing on the suction side. When pressure within the discharge pressure chamber is lower than a predetermined value, the trigger valve opens the passageway to permit gaseous refrigerant of high temperature within the discharge pressure chamber to be supplied to the bearing on the suction side.

Abstract: Artificial leather and a dyeing method therefor; the leather includes ultrafine polyamide fibers and is particularly a grained artificial leather having bright, deep color, good color fastness to dry cleaning with charged soap, a delicate touch free from any undesirable rubber-like feeling, as well as high durability.A super-entangled fiber base is provided comprising ultrafine polyamide fibers and/or bundles thereof; polyurethane including polyoxyethylene of molecular weight of 500-5,000 is applied. The polyamide ultrafine fibers are dyed with a metal-dye complex and a fixing agent.

Abstract: A vane compressor has a vane back pressure adjustment device including back-pressure chambers defined in a vane-supporting rotor and surrounded by vanes and side blocks secured to axial ends of a cylinder. The back-pressure chamber has axial ends disposed to follow a path against each of the side blocks when the rotor rotates. The path is divided into at least one high-pressure zone in which the vanes move across a pump outlet defined in the cylinder, and at least one normal-pressure zone which is the remainder of the path. In the normal-pressure zone, oil grooves defined in surfaces of the side blocks which face the rotor and supplied with oil from an oil sump in the vane compressor are in communication with the back-pressure chambers, to thereby maintain the oil pressure in the back-pressure chambers at a pressure level in the oil sump.

Abstract: A rotary compressor has a plurality of vanes which are slidably disposed in radial slots of a rotor to define fluid chambers in cooperation with a cylindrical housing. The radially innermost end of each vane, rotor and opposite ends of the housing define a back-pressure chamber which is supplied with a pressure during a suction stroke for maintaining the associated vane in sealing contact with the inner wall of the housing. Each of opposite ends of the housing has a unique configuration which damps the pressure in the back-pressure chamber when the chamber is fluidly isolated from a source of the pressure supply during a compression stroke, thereby eliminating excessive friction between the vane and the housing.

Abstract: Artificial leather and a dyeing method therefor; the leather includes ultrafine polyamide fibers and is particularly a grained artificial leather having bright, deep color, good color fastness to dry cleaning with charged soap, a delicate touch free from any undesirable rubber-like feeling, as well as high durability.A super-entangled fiber base is provided comprising ultrafine polyamide fibers and/or bundles thereof; polyurethane including polyoxyethylene of molecular weight of 500-5,000 is applied. The polyamide ultrafine fibers are dyed with a metal-dye complex and a fixing agent.

Abstract: A vane compressor has a vane back pressure adjustment device including back-pressure chambers defined in a vane-supporting rotor and surrounded by vanes and side blocks secured to axial ends of a cylinder. The back-pressure chamber has axial ends disposed to follow a path against each of the side blocks when the rotor rotates. The path is divided into at least one high-pressure zone in which the vanes move across a pump outlet defined in the cylinder, and at least one normal-pressure zone which is the remainder of the path. In the normal-pressure zone, oil grooves defined in surfaces of the side blocks which face the rotor and supplied with oil from an oil sump in the vane compressor are in communication with the back-pressure chambers, to thereby maintain the oil pressure in the back-pressure chambers at a pressure level in the oil sump.

Abstract: In producing a mixed phosphatic fertilizer, humic acid is mixed with fused phosphate to cause the humic acid to react on alkaline ingredients of the fused phosphate for turning these alkaline ingredients into chelate compounds, so that water-soluble phosphoric acid contents of succeedingly added phosphatic fertilizers such as calcium superphosphate and calcium triple-superphosphate are not reduced or insolubilized by being reacted with such alkaline ingredients. Thus, unlike the prior art, a stabilized predetermined level of water-soluble phosphoric acid contents can be secured in the resultant mixed phosphatic fertilizer along with a predetermined level of citric acid-soluble phosphoric acid contents.

Abstract: Pile fabric having excellent softness and high tear strength which has short fibers planted and adhered to a base with an adhesive, is obtained by applying an adhesive and planting the short fibers to the base, drying or curing the adhesive, and removing at least 5 weight % of the fibers of the base.

Abstract: A vane compressor has a vane back pressure adjustment device including back-pressure chambers defined in a vane-supporting rotor and surrounded by vanes and side blocks secured to axial ends of a cylinder. The back-pressure chamber has axial ends disposed to follow a path against each of the side blocks when the rotor rotates. The path is divided into at least one high-pressure zone in which the vanes move across a pump outlet defined in the cylinder, and at least one normal-pressure zone which is the remainder of the path. In the normal-pressure zone, oil grooves defined in surfaces of the side blocks which face the rotor and supplied with oil from an oil sump in the vane compressor are in communication with the back-pressure chambers, to thereby maintain the oil pressure in the back-pressure chambers at a pressure level in the oil sump.

Abstract: A rotary vane compressor directed to increasing the gas charging efficiency is disclosed. A side block is formed with an opening which is extended such that radially outer part of its rim is located radially outwardly of the inner periphery of a cylinder. The inner periphery of the cylinder is partly removed to form a notch such that the notch is aligned with the outer part of the rim of the opening. The opening and the notch define a suction port in combination, that is, the available area of opening of the suction port is increased by the proportion of the notch. Gas is sucked into the compressor not only sidewise but also in the peripheral direction.

Abstract: A sealing chamber is defined between the front head and the front side block, and an oil chamber between the rear side block and a partition member secured to the rear end face of the rear side block, respectively. The drive shaft, on which the rotor is rigidly fitted, is radially supported by a pair of roller bearings provided at the front and rear side blocks. The bearings have end portions remote from the rotor enclosedly disposed in the sealing chamber and the oil chamber. The lubricating oil feeding system includes lubricating oil feeding bores formed in the front and rear side blocks and communicating with a zone under discharge pressure, and clearances between the front and rear side blocks and opposed end faces of the rotor. The clearances have predetermined flow resistance, and communicate, on one hand, with the back pressure chamber formed within the rotor, and on the other hand, with the sealing chamber and the oil chamber by way of the above roller bearings.

Abstract: A vane compressor has a suction connector and a discharge connector arranged at a rear portion thereof. A rear suction chamber is formed at a rear side of the rear side block and communicates with pump working chambers. A passage means directly communicates the above rear suction chamber with an annular front suction chamber formed in the front head in a manner surrounding a sealing chamber accommodating a shaft-seal means.

Abstract: In producing a mixed phosphatic fertilizer, humic acid is mixed with fused phosphate to cause the humic acid to react on alkaline ingredients of the fused phosphate for turning these alkaline ingredients into chelate compounds, so that water-soluble phosphoric acid contents of succeedingly added phosphatic fertilizers such as calcium superphosphate and calcium triple-superphosphate are not reduced or insolubilized by being reacted with such alkaline ingredients. Thus, unlike the prior art, a stabilized predetermined level of water-soluble phosphoric acid contents can be secured in the resultant mixed phosphatic fertilizer along with a predetermined level of citric acid-soluble phosphoric acid contents.

Abstract: A heat-sensitive recording material is described comprising a support having a recording layer provided thereon, said recording layer containing (1) at least one colorless or pale-colored basic dye, (2) hydroquinone monobenzyl ether, and (3) at least one compound selected from compounds represented by the formulae (I) to (IV): ##STR1## wherein X and Y are each a chlorine atom, an alkyl group having 1 to 7 carbon atoms, a phenyl group or a benzyl group; m and n are each an integer of 0 to 3; and R.sub.1 and R.sub.2 are each a hydrogen atom, an alkyl group having 1 to 7 carbon atoms, a phenyl group or a benzyl group, or R.sub.1 and R.sub.2 may jointly form a cyclohexane ring. The heat-sensitive recording material is suitable for use in high-speed recording, e.g., high-speed facsimiles.