Abstract: In this grease composition, a grease produced by mixing at least one base oil selected from a mineral oil-type lubricant base oil, a synthetic lubricant base oil, and a biodegradable lubricant base oil with a thickener is compounded with a wax and water, and an additive such as a surfactant and a defoamer is optionally compounded therewith. A soap containing a calcium sulfonate complex is used as the thickener. A carnauba wax is preferably used as the wax. Since this grease composition is mainly composed of a grease and a wax, the grease composition extremely facilities its removal operation after application, is environmentally friendly, and has extremely excellent anti-corrosion performance. When the grease composition is used by being applied to a base material of an object to be welded, an effect of preventing the adhesion of welding spatters can be obtained.

Abstract: A dust seal is provided with a tubular fitting portion, a bush end surface abutting portion, a lip portion and a sealing projection integrally formed. The sealing projection is formed to project in an axially opposite direction to the lip portion from a radial inner section of the bush end surface abutting portion and abuts against a chamfered portion of a bush in such a manner as to overlap the chamfered portion. Therefore, at the time of supplying lubricant between the bush and a connecting pin, the sealing projection can prevent a part of the lubricant from entering between an end surface of the bush and the bush end surface abutting portion of the dust seal to maintain a sealed state therebetween. In consequence, the dust seal can be stably held on the inner peripheral side of a boss member, preventing the pulling-out of the dust seal.

Abstract: An apparatus and a method for successively conveying a series of sheets are disclosed. The apparatus has a first conveyer for conveying a sheet in a sheet conveying direction at a first speed and a second conveyer disposed spaced vertically away from the first conveyer for conveying the sheet in the same direction at a second speed. The second conveyer has a region overlapping with the first conveyer at least for a distance corresponding to a dimension of the sheet, e.g. the width of veneer sheet, as measured in the sheet conveying direction. A suction mechanism is disposed in said overlapping region for transferring by suction the sheet in the entirety of its dimension from the first conveyer to the second conveyer and holding by suction the sheet against the second conveyer. The sheet is further moved by the second conveyer, e.g. to a sheet stacking station.

Abstract: Grease for a slide bearing, which can suppress unusual noise attributable to a slip caused between a shaft and a bearing when a machine is stopped. In slide bearing grease 24 supplied to between a slide bearing 16 formed of a porous sintered alloy-made bushing having pores 30 impregnated with lubricating oil 31 and a shaft 22 inserted in the slide bearing 16 and supported to be slidingly rotatable in the circumferential direction, the slide bearing grease 24 employs base oil having dynamic viscosity of 10-70 mm2/s at 40° C. and exuding under a load of the shaft 22 to form an oil film 35 between the slide bearing 16 and the shaft 22.

Abstract: In a slide bearing assembly 12 comprising a shaft 22 and a bushing 16 which is made of a porous sintered material having a large number of pores 25, the bushing 16 is impregnated with a lubricant 24 containing 2.0 to 30 wt % of solid lubricating fine particles 26 made of at least one selected from among MoS2, WS2, and hexagonal BN, and the shaft 22 and the bushing 16 are used at surface pressure not lower than 6 Kgf/mm2 and sliding speed in the range of 2 to 5 cm/sec. This realizes prolongation of a period during which sliding operation can be continued in an oilless self-lubricating state even under a situation of sliding at a very low speed or angular motion in a very small stroke.

Abstract: An oil-impregnated sintered sliding bearing formed of a porous iron-based sintered alloy with quenched structure and receiving a high surface pressure capable of reducing the number of finishing steps by cutting and grinding and providing a bearing performance equivalent to or higher than that of conventional bearings, wherein a plurality of ridge-and-groove lines having a height difference of 2 to 12.5 ?m and extending in circumferential direction are axially arranged in parallel with each other by boring the bearing surface thereof to form a wavy surface in axial direction, and the portion thereof deeper by 10 to 60 ?m from the outer layer of the bearing surface is formed dense to seal surface pores so as to reduce the pores opening to the outer surface to 1 to 10 percent by area, whereby the bearing can be used at a surface pressure of 6 kgf/mm2 (58.5 MPa) or higher and a sliding speed of 2 to 5 cm/s.

Abstract: A seal (21) is constituted by an outer lip portion (22) to be held in abutting engagement with an outer link portion (9) of a crawler belt (7), an inner lip portion (23) to be held in abutting engagement with a bush (11), and an interconnecting bridge portion (24) bridged and connected between the outer and inner lip portions (22, 23). The outer lip portion (22) on the side of track link, the inner lip portion (23) on the side of bush, and outer bridge portion (24A) and inner bridge portion (24B) of the interconnecting bridge portion (24) are formed in thicknesses (T1, T2, T1? and T2?), respectively, which are in the relations of (T2?T2?>T1?T1?). A maximum outside diameter portion (24C) of the interconnecting bridge portion (24) is located radially outward of a median point between inner and outer peripheral ends of the lip portion (23) on the side of bush. The inner lip portion (23) as a whole is uniformly pressed against an end face (11A) of the bush (11) by the interconnecting bridge portion (24).

Abstract: A bearing apparatus has a porous bush (9) impregnated with lubricant and a shaft (10) supported by the bush (9). The shaft (10) has a quench hardened section (10a) formed in the form of a projection, and an indentation (10b) which is formed between portions of the quench hardened section (10a) and traps lubricant flowing out of the bush (9).

Abstract: An oil-impregnated sintered sliding bearing formed of a porous iron-based sintered alloy with quenched structure and receiving a high surface pressure capable of reducing the number of finishing steps by cutting and grinding and providing a bearing performance equivalent to or higher than that of conventional bearings, wherein a plurality of ridge-and-groove lines having a height difference of 2 to 12.5 ?m and extending in circumferential direction are axially arranged in parallel with each other by boring the bearing surface thereof to form a wavy surface in axial direction, and the portion thereof deeper by 10 to 60 ?m from the outer layer of the bearing surface is formed dense to seal surface pores so as to reduce the pores opening to the outer surface to 1 to 10 percent by area, whereby the bearing can be used at a surface pressure of 6 kgf/mm2 (58.5 MPa) or higher and a sliding speed of 2 to 5 cm/s.

Abstract: A seal device (31) for a bearing system (21) is constituted by first and second seal rings (32) and (35). The first seal ring (32) is constituted by a lip seal (33) having a lip portion (33B) in sliding contact with an end face (23B) of a bush (23) which is fitted on a joint shaft (26), and a slide tube (34) having a seal surface (34C) on an end face at an axial end away from the lip portion (33B) which is formed integrally with a tubular body portion (33A) of the lip seal (33). The second seal ring (35) is fixedly fitted in a boss (22) radially on the outer side of the first seal ring (32), and provided with a seal surface (35D) on the inner side of an annular inward collar portion (35C) for sliding contact with the seal surface (34C) of the slide tube (34).

Abstract: A seal (21) is constituted by an outer lip portion (22) to be held in abutting engagement with an outer link portion (9) of a crawler belt (7), an inner lip portion (23) to be held in abutting engagement with a bush (11), and an interconnecting bridge portion (24) bridged and connected between the outer and inner lip portions (22, 23). The outer lip portion (22) on the side of track link, the inner lip portion (23) on the side of bush, and outer bridge portion (24A) and inner bridge portion (24B) of the interconnecting bridge portion (24) are formed in thicknesses (T1, T2, T1′ and T2′), respectively, which are in the relations of (T2≈T2′>T1≈T1′). A maximum outside diameter portion (24C) of the interconnecting bridge portion (24) is located radially outward of a median point between inner and outer peripheral ends of the lip portion (23) on the side of bush.

Abstract: A seal device (31) for a bearing system (21) is constituted by first and second seal rings (32) and (35). The first seal ring (32) is constituted by a lip seal (33) having a lip portion (33B) in sliding contact with an end face (23B) of a bush (23) which is fitted on a joint shaft (26), and a slide tube (34) having a seal surface (34C) on an end face at an axial end away from the lip portion (33B) which is formed integrally with a tubular body portion (33A) of the lip seal (33). The second seal ring (35) is fixedly fitted in a boss (22) radially on the outer side of the first seal ring (32), and provided with a seal surface (35D) on the inner side of an annular inward collar portion (35C) for sliding contact with the seal surface (34C) of the slide tube (34).

Abstract: The improved slide bearing assembly comprises at least a shaft and a bush that is formed of a porous iron-base sintered material and is characterized in that the bush is impregnated with a lubricant oil having a viscosity of 240-1500 cSt. The bearing assembly can be operated in slow- and high-pressure applications without oil refillings for a prolonged period of at least several years. The shaft is preferably formed of an iron or a steel member that have been subjected to a treatment of surface modification. The slide bearing assembly is preferably used in such an environment that the working pressure applied to the sliding surfaces is at least 6.0 kgf/mm.sup.2 and that the sliding speed is in the range 2-5 cm/sec.

Abstract: In a continuous rolling line wherein the tail end part of a preceding rolled plate and the head end part of a following rolled plate are joined subsequently to a rough rolling and subjected to a following continuous finish rolling: a joining method of rolled plates wherein the tail end of the preceding rolled plate and the head end of the following rolled plate are formed into a nearly rectangular convex and concave shape respectively so as to inlay each other, the convex part and the concave part being combined each other in the same plane as the rolling lines, and then being fed to the continuous finish rolling; a joining method rolled plates wherein the side surface of the parallel inlay is formed in a taper shape in the direction of the plate thickness at any desired location of either the tail end part of the preceding rolled plate or the head end part of the backward rolled plate or of the both parts, and then being fed to the continuous finish rolling; and a joining method of rolled plates wherein the

Abstract: The improved slide bearing assembly comprises at least a shaft and a bush that is formed of a porous iron-base sintered material and is characterized in that the bush is impregnated with a lubricant oil having a viscosity of 240-1500 cSt. The bearing assembly can be operated in slow- and high-pressure applications without oil refillings for a prolonged period of at least several years. The shaft is preferably formed of an iron or a steel member that have been subjected to a treatment of surface modification. The slide bearing assembly is preferably used in such an environment that the working pressure applied to the sliding surfaces is at least 6.0 kgf/mm.sup.2 and that the sliding speed is in the range 2-5 cm/sec.