Abstract: A rotary cylinder actuator has a piston rod placed in a cylinder, provided in its surface with a guide groove and capable of being moved axially between a position corresponding to a clamping angular position and a position corresponding to an unclamping angular position. A guide member is attached to the cylinder to engage in the guide groove. The piston rod turns from a first angular end position toward a second angular end position for normal turning and turns from the second angular end position toward the first angular end position for reverse turning. The opposite guide surfaces of the guide groove serve as a first guide surface for normal turning and a second guide surface for reverse turning, respectively, so that the guide member moves relative to the piston along different paths in the guide groove while the piston rod turns for normal turning and reverse turning, respectively.

Abstract: An actuator device includes a housing having a bore and an internal moving body movable within the bore in the direction along the center axis of the bore. The housing is composed of two housing members which divide the housing along the center axis. An inner surface which forms a part of the wall of the bore and two slit surfaces on both sides of the inner surface are formed on each of the housing members. When two housing members are coupled to each other by fastening the longitudinal portions of the housing members by end members, two slits extending along the entire length of the housing are defined by the slit surfaces of two housing members. Since the respective housing members have relatively simple cross sectional shapes, the housing members can be easily produced, by an extrusion process or a drawing process, at low cost. Further, since two slits are provided on the housing, an external moving body can be connected to the internal moving body by two driving members.

Abstract: A rodless cylinder is coupled to an elongated base. The construction for coupling the rodless cylinder to the base includes a hollow duct formed in the bottom wall of the base and extending along the entire length of the base. A projection extending along the entire length of the duct is formed on the upper inner wall of the duct when the base and duct are formed by a drawing or extrusion process. After the base is formed, the longitudinal ends of the projection are cut off by a predetermined length from both longitudinal ends of the base. The portions of the duct from which the projections are cut off act as receiving portions into which mounting nuts are inserted, and the end faces of the remaining projection act as stoppers which abut the inserted mounting nuts to position them. The upper walls of the duct above the receiving portions are cut off to form slits opening to the upper face of the base. The slits act as mounting bolt passages of the rodless cylinder.

Abstract: An inner seal band having flat surfaces on both sides is used for closing a slit formed on the cylinder tube of a rodless cylinder. An internal moving body is disposed in the cylinder tube and moves along the longitudinal axis of the cylinder tube. The inner seal band passes through a channel groove formed on the bottom face of the internal moving body. Thin plate-like abrasion members made of synthetic resin are adhered on the side walls of the channel groove. The abrasion members contact with the edges of the inner seal band and restricts its movement in the transverse direction. Since the abrasion members are separate members from the side walls of the channel groove, a material different from that of the side walls, such as abrasion resistant material can be used for the guide members.

Abstract: The elastomer dampers are disposed at both ends of the actuator cylinder in order to stop the piston moving in the cylinder at its stroke ends. The elastomer damper includes a pair of the protruding portions which abut the piston at its stroke end. The protruding portion has an tapered shape in which the cross sectional area thereof gradually decreases from the base to the top. Therefore, when the piston abuts the protruding portions and compresses the protruding portions, the braking force exerting on the piston gradually increases without sudden change. Therefore, the piston decelerates smoothly at its stroke ends. Further, since the top surface of the protruding portion is formed as a flat plane and the top surface is connected to the tapered side surface of the protruding portion by a round surface, no stress concentration occurs at this portion. Therefore, cracks or breakage of the material do not occur in the top surface even after a long operating time of the actuating cylinder.

Abstract: A rodless power cylinder includes a tube having an oblong circular cross section bore and a slit extending along the longitudinal axis of the bore and penetrating the wall of the tube. The bore includes a slit-side inner surface on which the slit opens and a counter-slit-side inner surface which opposes the slit-side inner surface. The slit-side inner surface of the bore is formed as a flat plane or a curved plane having substantially no curvature. Further, recesses are formed on the slit side inner surface at both sides of the slit. The surfaces of the recesses are formed as curved planes having a curvature larger than the curvature of the slit-side inner surface. An inner seal band made of a flat, thin metal band is provided to seal the opening of the slit. The seal band contacts the surface of the recess at its transverse edges. Therefore, a good sealing capability is achieved by the contacts between the surfaces of the recesses and the edges of the seal band.

Abstract: The linear actuator includes a tube provided with a slit which penetrates the wall of the tube and extends parallel to the longitudinal axis of the tube. In the tube, an internal moving body is disposed. The internal moving body moves in the tube along the direction of the longitudinal axis of the tube. An external moving body is disposed outside of the tube and coupled to the internal moving body by a driving member through the slit in the tube so that the external moving body moves integrally with the internal moving body along the slit. Band guides for guiding an outer seal band and an inner seal band are attached to the external moving body. Slider members are disposed between the external moving body and the outer wall surface of the tube to avoid direct contact between the external moving body and the tube. The band guide and the slider member are formed as an integral one-piece element.

Abstract: The slide unit includes a rodless power cylinder having a cylinder tube. End caps are attached to both ends of the cylinder tube. A slit extending in parallel with the axis of the cylinder tube is formed on the wall of the cylinder tube. A piston is disposed in the bore of the cylinder tube and is movable along the slit. An external carriage is connected with the piston by a yoke extending through the slit. An inner seal band and an outer seal band extending along the slit for closing the opening of the slit from the inside and outside, respectively, are provided. The ends of the inner seal band and the outer seal band are inserted into corresponding recesses formed on each of the inner end faces of the end caps. A pin hole crossing the recesses and extending to the upper face of each end cap is provided. A fitting hole is disposed on each end of the inner seal band and the outer seal band at the position corresponding to the pin hole.

Abstract: According to the rodless power cylinder of the present invention, a pressure relieving passage which opens to the space between the inner seal band and the outer seal band at one end, and to the outside of the cylinder barrel at the other end is provided in the end cap of the cylinder barrel. Further, a cap cover is provided on the end cap. The cap cover includes a valve element portion which resiliently fits into the end of the relieving passage opening to the outside. When the pressure in the space between the seal bands increases to a predetermined level due to leak of the inner seal band, the valve element opens outward due to the pressure in the relieving passage to allow the fluid in the space to escape to the outside. Thus, the pressure in the space between the seal bands are kept at a low level even if a leak in the inner seal band occurs and, thereby, a blow off of the outer seal band and damage to the rodless power cylinder is prevented.

Abstract: In a rodless cylinder device, an inside moving unit is slidably inserted in a cylinder and an outside moving unit is slidably inserted on the cylinder, the inside and outside moving units being magnetically coupled. The inside moving unit has inner sliding guide rings on the two opposite ends with an inside magnet device disposed therebetween. A sealing ring or packing is provided between the inside magnet device and one of the inner sliding guide rings in such a manner that a grease retaining space is formed between the packing and the inner sliding guide ring. While the outside moving unit is moved together with the inside moving unit under the magnetic coupling force between the two moving units, the packing is lubricated by grease supplied from the grease retaining space, whereby the lubricating performance of the rodless cylinder is improved.

Abstract: According to the rodless power cylinder of the present invention, plug members are inserted in the bore of the cylinder barrel. A slit is provided on the cylinder barrel and extending in parallel to the axis of the cylinder barrel. A piston is disposed in the bore of the cylinder barrel and is movable along the slit. An external carriage which is connected with the piston by a yoke extending through the slit is provided. An inner seal band which closes the inner opening of the slit is disposed in the cylinder barrel along the slit. The ends of the inner seal band are clamped between the securing screws and the shank of the plug members, The securing screw extends through the slit from a fitting plate disposed on the outer wall of the cylinder barrel. The fitting plate is secured to the outer wall of the cylinder barrel by mounting bolts threaded into the plug members through the slit. Therefore, the inner seal band and the outer seal band can be secured without any machining of the cylinder barrel.

Abstract: The linear actuating device of the present invention has a rodless power cylinder unit with a cylinder barrel. An external carriage is disposed on the cylinder barrel and is movable along the axis of the cylinder barrel. A base on which a guide rail is mounted is provided. A slide table is driven by the external carriage of the rodless power cylinder unit and guided by the guide rail. According to the present invention, the external carriage is disposed on the side of the cylinder barrel facing the guide rail. This construction allows the external carriage and the slide table to be accommodated within the height of the cylinder barrel. Therefore, the height of the linear actuating device as a whole can be reduced to substantially the same as the height of the cylinder barrel.

Abstract: Blooming on the surface of products molded from an olefinic thermoplastic elastomer composition containing an olefinic thermoplastic elastomer and one or more additives which promotes such blooming is prevented by compounding into the elastomer one or more compounds selected from the group consisting of esters of polyhydric alcohols, alkylalkanolamines, alkylalkanolamides, fatty acid amides, higher alcohols, aliphatic amines, fatty acids and adducts of alkylene oxides to these compounds. The composition thus can be advantageously used as interior materials of automobiles and materials for electronic instruments.

Abstract: The present invention relates to a self-fire distinguishable halogen-free flame resisting synthetic resin composition obtained by adding 0.5 to 15 parts by weight of synthetic silicate (also called "hydrated silicic acid" or "wet silica") to 100 parts by weight of a mixture comprising 70 to 30 parts by weight of at least one thermoplastic synthetic resin and 30 to 70 parts by weight of magnesium hydroxide or aluminum hydroxide having an average particle size of 0.1 to 10 .mu.m.This composition is white semitranslucent unlike the one containing carbon black according to the prior art, so that it is suitable for decorative use including floor materials and wall covering materials.

Abstract: A rodless cylinder assembly comprises a cylinder barrel provided with an axial bore in which a piston is slidably fitted and a slit formed in the outer surface thereof so as to be directed upwardly. A slide mount is operatively connected to the piston through connecting member integrally formed with the piston and projecting outwardly through the slit to be slidable along the upper surface of the cylinder barrel in an axial direction in accordance with the movement of the piston. The slide mount is slid along first guide rails disposed on the upper surface of the cylinder barrel at both sides of the slit and along second guide rail formed in opposite side walls of the cylinder barrel. Guide members are disposed between the second guide rails and side depending walls portions of the slide mount and the clearance between the second guide rails and the guide members can be adjusted by screw means.