Abstract: A rod is inserted in a first cylinder. A first oil chamber is defined by the inner surface of the first cylinder. The rod can be reciprocated with a first stroke. A second cylinder is coupled to the first cylinder by a connecting member. A metal bellows is housed in the second cylinder. A gas chamber is defined by the inner surface of the bellows. A second oil chamber is defined by the outer surface of the bellows and the inner surface of the second cylinder. The bellows contracts with a second stroke corresponding to the first stroke of the rod. The first and second oil chambers communicate with each other via an oil path formed in the connecting member. A valve seat is arranged on an end wall of the second cylinder. A valve body is fixed to the bellows so as to oppose the valve seat. If the bellows expands farther than the second stroke when a gas is supplied into the gas chamber, the valve body is brought into contact with the valve seat.

Abstract: A belt tensioner has a shaft having an external thread and rotatably mounted in a body, a torsion spring provided between the body and the shaft so as to urge the shaft in a rotational direction, and a cylindrical rod having an internal thread engaged with the external thread of the shaft. A lower end of the rod is projected from the body so as to be operatively connected to a tension pulley for a belt. The torsion spring and both the threads are arranged to project the rod by the rotation of the shaft urged by the torsion spring. The rod is secured to the body so as to be adjusted in angular disposition.

Abstract: In a car suspension system according to the present invention, a cylinder assembly comprises a cylinder housing and a rod fitted therein for axial reciprocation. An oil chamber and a gas chamber are defined inside the cylinder assembly, and the capacity of the gas chamber changes as the cylinder housing and rod reciprocate relative to each other. A damping force-generating mechanism is provided in the oil chamber. A metal bellows is contained in the cylinder assembly so as to be coaxial with the cylinder housing. The bellows can extend and contract in the axial direction of the cylinder housing. Having a sealed internal space, the bellows divides the oil and gas chambers completely. Thus, when the rod reciprocates in the axial direction, relative to the cylinder housing, the bellows extends and contracts axially.

Abstract: A cylinder piston apparatus according to the present invention comprises a cylinder housing having an oil chamber therein, and a rod fitted in the cylinder housing. A piston-shaped partition member is arranged in the cylinder assembly. The oil chamber is divided into first and second oil chambers by the partition member. The partition member is provided with a valve housing, which has an outside circulation hole capable of communicating with the second oil chamber. A rotary valve is fitted in the valve housing. The valve has an inside circulation hole, which is situated at a position corresponding to the outside circulation hole, and can communicate with the first oil chamber. A stepping motor for driving the rotary valve is housed in a motor-holding chamber which is defined inside the cylinder assembly. The motor-holding chamber is filled with oil, so that the motor is immersed in the oil.

Abstract: A dot matrix print head in which the mass of the armature is reduced by providing a groove in the armature in the portion where the magnetic flux density is relatively low. The armature may be advantageously attached to a sheet spring by laser welding applied from the bottom surface of the groove without creating craters in the external face of the sheet spring. Reduction in the mass of the armature allows a substantial increase in the print speed of the print head. Use of laser welding reduces the manufacturing cost of the print head and the absence of any craters in the external face of the sheet spring is favorable for the performance of the magnetic circuit of the print head.

Abstract: A winder for a baggage area cover sheet for an automobile automatically winds the cover sheet set in the baggage area by a winding drum which is energized by aid of rotation of a torsion coil spring. At the inner walls on both sides of the car, a securing device is fixed which includes, a pair of pressing members or a pair of pressing member and a latching member. The securing device maintains the winder in position by pressing it from both sides or one side.

Abstract: A coated coil spring wrapped in a coating member prepared from a soft synthetic resin foam, wherein the coating members of the respective coil spring turns constituting at least the effective region of the coil spring are provided with a helical clearance; and the width of said clearance accounts for 0.15 to 0.50 times the width of the adjacent coil spring turns.

Abstract: A steel rod body is fixedly fitted, at its end, with a metallic coupling member manufactured independently of the rod body. A solid section having a free end is formed either at the end of the rod body or the coupling member, while a tube section having an opening at its end is provided on the corresponding end of either the rod body or the coupling member. Circumferential and axial grooves are formed on the outer peripheral surface of the solid section. At least the free end of the solid section is inserted into the opening of the tube section, and the tube section is crimped by means of dies. Thus, part of the metal material of the tube section creeps into indentations on the solid section so that the tube section and the solid section are firmly linked together for integration. A waterproof sealant is provided either on an inner surface of the tube section or on an outer surface of the solid section.

Abstract: A viscoelastic damper which is adapted to control the vibration of a structural member, a tank, a pipe, etc. which may be caused by an earthquake or wind while producing minimum reaction force when the structural member and so on is slowly displaced as a result of the thermal deformation of the member itself or another member connected thereto. Such a property of a viscoelastic damper can be obtained by using dilatant liquid which presents relatively small resistance when the speed of the motion is small and produces progressively great resistance as the speed of the motion increases. To the end of enhancing this favorable property of the viscoelastic damper, the shoulder surfaces that are exposed to the dilatant liquid are rounded. By providing a spiral groove or projection in the member exposed to the dilatant liquid to produce rotational motion between the two ends of the damper, this property is enhanced even more.

Abstract: A hose band is formed into a ring, in order to be wrapped around a hose. When the band is wrapped around the hose, its end portions are superposed, one overlying the other. Projections are formed on the underlying end portion, in order to be fitted into the holes made in the overlying end portion. A tightening lug is included in the overlying end portion of the band. The lug comprises a pair of outwardly protruding legs set apart in the lengthwise direction of the band, and a main section connecting the upper ends of the legs and plastically bent in such a way that the portion, which is the center as viewed in the widthwise direction, protrudes inwardly, and both end portions protrude outwardly.

Abstract: An FRP plate spring member having spring characteristics of the invention has a protective layer of a resin formed on the entirety or part of the outer surface of an FRP base comprising a number of reinforcing fibers which are impregnated with and held in a cured matrix resin. A process for manufacturing such an FRP plate includes a step of applying a resin for forming the protective layer on the entirety or part of the inner surface of a mold for molding the FRP plate.

Abstract: In a print head comprising a plurality of magnetic circuits each of which comprises an armature supported by a spring, a permanent magnet for biasing the armature in one direction, and an electromagnet which can be energized so as to cancel the biasing force of the permanent magnet, so that a print wire fixed to the armature may be driven by energizing the electromagnet and thereby driving the armature with the restoring force of the spring. The cross-sectional areas of the paths of magnetic flux between neighboring electromagnet circuits are made uneven. This can be achieved by providing base portions which are common to two electromagnet core portions. Thereby, the print pressure of all the print wires is made uniform and an increase in printing speed and improved print quality can be achieved at the same time.

Abstract: A suspension system according to the present invention comprises a cylinder piston mechanism and a sub-tank. A main gas chamber is defined inside the cylinder piston mechanism, while a sub-gas chamber is defined inside the sub-tank. An oil chamber, filled with oil, and an oil passage are arranged between the main and sub-gas chambers. The oil passage is opened and closed by means of a control valve, which has a rotating valve plug for controlling the oil flow. When the control valve is open, the main and sub-gas chambers change their respective capacities simultaneously as a rod reciprocates. When the valve is closed, only the main gas chamber changes its capacity as the rod reciprocates. The control valve is provided with a spring-constant changing orifice and a damping-force changing orifice, whereby the spring constant and damping force of the system are changed simultaneously, in accordance with the rotational position of the valve plug.

Abstract: A hose band according to the present invention comprises an elongated metallic band body which, when in use, is wound around a hose so that both end portions thereof are joined to each other. The band body has spaced apart retaining holes formed in an outer lap portion and hooks formed on an inner lap portion and adapted to engage the holes. The hooks each have a slanting surface which protrudes obliquely toward the end side of the outer lap portion. The bulge outward so that their cross section is outwardly convex.

Abstract: A tractor feeder for feeding continuous printing paper having perforations along its side fringes by driving pins engaged to the perforations. The pins are formed on the outer surface of an endless belt which is passed around a drive sprocket on one hand and a guide member on the other hand. The guide member is adjustable by an adjusting member such as an eccentric cam so as to apply a desired tension to the endless belt. The guide member may be provided with a roller rotatively supported by the guide member or a pair of rollers rotatively supported by the frame so as to minimize the friction to the traveling motion of the endless belt. These pulleys may be provided with flanges so that friction between the side edges of the endless belt and the guide member may be minimized.

Abstract: In a tension providing device having a rotary shaft which rotates the spring force in an inserted casing, a pushing body which slide in an axial direction by the aid of the rotation of the rotary shaft, a seal bolt screwed with the base end portion of the casing, and a boot which covers between casing and pushing body, the mixing of dust and foreign matters from outside and the leakage of the lubricant coated or filled in the inner portion are prevented due to the covering of the boot and seal with bolt.

Abstract: A vehicle suspension apparatus comprising a body with an internal space and capable of contraction and expansion within which a gas chamber and an oil chamber are formed, an auxiliary container having therein a gas chamber, a channel with a valve connecting the gas chamber in the body and gas chamber defined in the auxiliary container, and a restriction member mounted in the oil chamber having a contrable orifice which allow passage for the working oil occupied with the orifice therebetween.

Abstract: A coil-spring winding apparatus according to the present invention comprises a guide rail extending along the axis of a mandrel, and a carriage movably supported by the guide rail. The carriage is fitted with first and second guide rollers. The second guide roller, which is spaced from the first guide roller in the radial direction thereof, guides the coil forming a coil spring toward the first guide roller. The first guide roller is moved in the axial direction of the mandrel, at a speed determined by the rotating speed of the mandrel, so that the coil is wound at predetermined pitches. The second guide roller can pivot around a point near the point of contact between the first guide roller and the coil. The first guide roller is oriented always in the same direction as the second guide roller. The direction of these two guide rollers is changed by means of an actuator, depending on the pitch angle of the coil spring.

Abstract: A tension providing device which enables to prevent the invasion of dust and water into a casing together with enabling the locking and the winding off of the torsion spring from the base side of the casing. This device is characterized by being provided with a rotatable shaft in the casing which only rotates by restraining the sliding in the axial direction of the casing, screwing the pushing body which slides by the rotation of the shaft with the shaft, supporting this screwed portion with bearing, and further screwing a seal bolt at the base portion of the casing.

Abstract: Disclosed is an improved laminated metallic belt consisting of at least two layers of an endless metallic band for use in a torque transmission device, which can transmit torque between two pulleys having variable effective radii, in combination with a plurality of metallic blocks which have surfaces contacting the innermost layer of the laminated metallic belt and are arranged along the laminated metallic belt. The metallic belt according to the present invention may be made of precipitation hardening martensitic stainless steel or maraging steel which have favorable properties as to toughness, mechanical strength and the adaptability for welding required for making an endless laminated metallic belt, but lack the surface hardness to ensure relatively favorable durability. The durability of the steel is improved according to the present invention by a nitride layer and/or an electroless nickel plating layer formed on the side edges of the endless metallic band.