Abstract: A speed change device comprises first and second outer gears, crankpins connected to the second outer gear, and pinions having pin holes for receiving the crankpins and outer gear teeth formed at the periphery thereof. The speed change device is characterized in that the pinion has through holes formed in a star shape, and a support block has a star shape corresponding to the shape of the through holes in the pinion, so that the support block is inserted into the through holes in order to support the crankpins by means of pairs of bearings.

Abstract: A drive controlling mechanism comprises an operative block assembly securely connected with a motor housing accommodating therein a hydraulic motor and rotatably receiving a rotatary shaft of the hydraulic motor; a parking brake arrangement connected with the operative block assembly to brake and release a rotary shaft; a control valve arrangement provided to control of the hydraulic motor and actuation of the parking brake arrangement; a pair of inlet-outlet passages connecting the actuation ports of the hydraulic motor and the control valve arrangement; a control conduit arrangement having a shuttle valve permiting fluid under pressure to be introduced into the parking brake arrangement from the control valve arrangement and to be discharged from the parking brake arrangement; and a drain passage arrangement for discharging fluid under pressure from the parking brake arrangement through the shuttle valve to a drain chamber defined between the motor housing and the hydraulic motor.

Abstract: A hydraulic apparatus for changing flow rate by displacing the flow rate changing member of a variable displacement hydraulic pump accommodated in a casing for eliminating any surplus and leaked oil and diminished kinetic energy loss comprises an actuator, a flow rate control valve, a resilient member accommodated in the casing to urge the flow rate changing member toward the direction where the flow rate of the hydraulic pump is increased, first and second sliding members slidably received in first and second cylinder chambers, respectively, provided in the casing to urge the flow rate changing member toward the direction where the flow rate of the hydraulic pump is decreased, a first fluid conduit having one end connected with an outward port of the hydraulic pump and the other end connected with a rear port of the actuator, a second fluid conduit having one end connected with a fore port of the actuator and the other end connected with an inlet port of the hydraulic pump through the flow rate control valve

Abstract: A hydraulic actuator comprises: a cylinder; a piston axially slidably received in the cylinder and having a hollow bore axially extending therein; at least a locking member radially movably retained in the piston; a ram axially slidably received in the hollow bore of the piston and having an inclined portion connecting a lower engaging portion and an upper engaging portion with a circumferential length longer than that of said lower engaging portion, said inclined portion being slidably engageable with the radially inner face of the locking member for radial movement thereof; a switch piston radially slidably mounted on the cylinder to have a radially inner face engageable with the radially outer face of the locking member; and detecting means for detecting the piston under conditions locked and unlocked with the cylinder by detecting radial movement of the locking member through the switch piston.

Abstract: The hydraulic apparatus includes a valve which is closable to prevent fluid from flowing out of a cylinder chamber when the pressure of the fluid drops below a predetermined level, and a transmitter which opens the valve so as to keep the chamber pressure constant when a piston slidably received in the chamber moves due to heat-caused expansion of the fluid in the chamber. The apparatus is disclosed in the context of an aircraft spoiler control system.

Abstract: An improved hydraulic control circuit is disclosed for use in crawler type vehicles and the like in which relief valves as used in conventional circuits are eliminated. The resulting hydraulic circuit is not apt to be damaged by surge pressures and high pressures in the return passages, are simple in their design and more convenient to fabricate.

Abstract: A drive controlling mechanism comprises an operative block assembly securely connected with a motor housing accommodating therein a hydraulic motor and rotatably receiving a rotary shaft of the hydraulic motor; a parking brake arrangement connected with the operative block assembly to brake and release a rotary shaft; a control valve arrangement provided to control of the hydraulic motor and actuation of the parking brake arrangement; a pair of inlet-outlet passages connecting the actuation ports of the hydraulic motor and the control valve arrangement; a control conduit arrangement having a shuttle valve permitting fluid under pressure to be introduced into the parking brake arrangement from the control valve arrangement and to be discharged from the parking brake arrangement; and a drain passage arrangement for discharging fluid under pressure from the parking brake arrangement through the shuttle valve to a drain chamber defined between the motor housing and the hydraulic motor.

Abstract: A fail-safe fluid control valve comprises a first sleeve accommodated in and fixed to a valve housing, a second sleeve slidably received in the first sleeve, and a valve spool slidably received in the second sleeve. The first and second sleeves are properly formed with grooves and ports while the valve spool is properly formed with spaced large diameter portions. When there occurs such an abnormal condition that the valve spool is jammed or stuck to the second sleeve, the second sleeve is axially moved in unison with the valve spool by an input lever for actuating the fail-safe control valve under the same condition as a normal condition in which the valve spool is axially moved by the input lever.

Abstract: A crawler type travelling vehicle comprises in combination: an endless belt including a number of segments flexibly connected with each other to crawl on the earth; a sprocket wheel drivably engageable with the endless belt and having an axial wheel bore extending axially thereof; a motor housing inserted in said axial wheel bore to rotatably support the sprocket wheel through two bearings with the mid-circumferential plane of the sprocket wheel positioned between the mid-circumferential planes of the bearings; a fixed frame positioned axially inwardly of the sprocket wheel to securely support the motor housing and having an axial frame bore in axial alignment with the axial wheel bore; a hydraulic motor accommodated in the motor housing and having a rotary shaft; a reduction gear unit positioned axially outwardly of the sprocket wheel and within the width of the endless belt to operably be connected with one end portion of the rotary shaft in driving engagement with the sprocket wheel; a control block dispos

Abstract: A sealing mechanism, comprises: a first member having a conical bore formed in coaxial relation with its own axis and a first face formed at the side thereof; a second member made of a metal and relatively rotatable with respect to the first member, the second member having a second face spaced from and opposing to the first face of the first member, and an annular groove recessed away from and opposing to the conical bore to have a bottom face and radially inner and outer faces connecting the bottom face and the second face; an annular floating seal assembly accommodated in the conical bore of the first member, the annular floating seal assembly including a metal seal ring having a lip portion extending radially outwardly and toward the annular groove, and a resilient annular ring disposed between the conical bore and the seal ring to urge the seal ring toward the annular groove; and a ring member made of a metal and provided in the annular groove to have a rear face in metal-to-metal contact with the bottom

Abstract: Herein disclosed is a hydraulic actuator which comprises an outer cylinder; an inner cylinder attached at its one end to the axial inner one end of the outer cylinder in coaxial relation with the outer cylinder to define an annular gap between the outer and inner cylinders; a piston having a hollow bore axially extending from its one end to the other end and closed at the other end and slidably received in the annular gap; and a locking mechanism temporarily locking the piston with the outer cylinder upon the farthest movement of the piston to the other end thereof; the locking mechanism including a locking member coupled with one end portion of the piston and which is radially movable, a ram resiliently received in the other end of the inner cylinder and having an inclined stepped portion and a hollow bore axially extending from its one end to the other end and opened at the other end, and an annular locking groove formed at the inner periphery of the other end of the outer cylinder, whereby the locking memb

Abstract: Herein disclosed is an apparatus for producing a bulky yarn like natural fibers. The apparatus comprises a twist mechanism provided on a yarn travelling path for twisting and untwisting a yarn; a rubbing mechanism provided on the yarn travelling path of the yarn which is twisted by the twist mechanism and having a rough surface so as to rub filaments constituting the yarn for imparting scratches thereto; and a stretching mechanism provided on the downstream of the rubbing mechanism along the yarn travelling path of the untwisted yarn to stretch the yarn so that the filaments are severed at their scratches to produce a bulky yarn.

Abstract: A radial piston type hydraulic pump-motor comprises a cylinder block formed with a plurality of radial cylinders circumferentially equally spaced and each opened at its radially outer end; a plurality of piston assemblies each radially slidably accommodated in each of the radial cylinders of the cylinder block to provide a cylinder chamber defined by the radial cylinder and the piston assembly; a plurality of inlet-outlet passages formed in the cylinder block, each having one end opened at said cylinder chamber and the other end opened exteriorly of the cylinder block; a housing accommodating therein the cylinder block and the piston assemblies and having a radially inner face held in contact with the radially outer ends of the piston assemblies, the improvement is characterized in that the radially outer end of the piston assemblies is in contact with the radially inner face of the housing at its axially spaced two points.

Abstract: A radial piston type hydraulic pump-motor comprises a cylinder block formed with a plurality of radial cylinders circumferentially equally spaced and each opened at its radially outer end; a plurality of piston assemblies each radially slidably accommodated in each of the radial cylinders of the cylinder block to provide a cylinder chamber defined by the radial cylinder and the piston assembly; a plurality of inlet-outlet passages formed in the cylinder block, each having one end opened at the cylinder chamber defined when the piston assembly is moved to the radially inward stroke end and the other end opened at side face of the cylinder block radially outwardly of the one end; a housing accommodating therein the cylinder block and the piston assemblies and having a radially inner face held in contact with the radially outer ends of the piston assemblies; at least an introducing passage partially formed in the housing and including a main introducing passage having one end exteriorly opened and a plurality of

Abstract: A drive controlling mechanism comprises in combination: a hydraulic motor including a cylinder block, and a rotary shaft extending axially of and positioned within the cylinder block to be engaged with the cylinder block for rotation therewith; a motor housing for accommodating therein the hydraulic motor; a control block securely connected with the motor housing and rotatably receiving one end portion of the rotary shaft; a parking brake arrangement detachably received within the axially outer half of the control block for being capable of braking the rotary shaft; a control valve arrangement detachably mounted on the outer peripheral wall of the control block in fluidal communication with the parking brake arrangement by way of a shuttle valve accommodated in a radial bore formed in the control block so that the hydraulic motor is controlled to be driven by the control valve arrangement; and a pair of inlet-outlet conduits for introducing a pressure oil to the control valve arrangement and discharging the p

Abstract: A fail-safe fluid control valve including a first sleeve fixedly accommodated in a valve housing, a second sleeve reciprocably movably received in the first sleeve. The first and second sleeves are suitably grooved and ported, and the valve spool is formed properly with annular flanges. When there occur such abnormal conditions that the second sleeve and the valve spool are jammed or stuck to each other, the second sleeve is adapted to be moved in unison with the valve spool to actuate the fail-safe fluid control valve under entirely the same conditions as normal conditions.

Abstract: Herein disclosed is a double twisting machine of flyer type, which comprises a pair of rotatable fliers, a pair of bow guides formed with a through bore for allowing wire elements to pass therethrough, two pairs of guide holders each retained in one end of each of the fliers for holding one end of each of the bow guides, and two pairs of shock-absorbing elastic members each interposed between each of the fliers and each of the bow guides through the corresponding one of the guide holders. The fliers are in spherical contact with the guide holders so as to assure smooth swinging motions of the bow guides.

Abstract: A fail-safe fluid control valve including a first sleeve accommodated in and fixed to a valve housing, a second valve also accommodated in and fixed to the valve housing in parallel relation with the first sleeve, a first valve spool slidably accommodated in the first sleeve, and a second valve spool slidably accommodated in the second sleeve. The first and second sleeves are properly formed with grooves and ports while the first and second valve spools are properly formed with large diameter portions spaced. When there occurs such an abnormal condition that the first valve spool and the first sleeve are jammed or stuck to each other, the second valve spool is adapted to be moved for actuating the fail-safe control valve under entirely the same condition as a normal condition.

Abstract: Herein disclosed is an arrangement of strand twisting apparatuses, comprising a plurality of strand twisting apparatuses which are side-by-side and vertically installed in a row on floor, and each of which comprises a fore portion of a frame including a flyer unit vertically disposed for supplying and twisting strands into a cable, a take-up unit disposed in side-by-side relation with the flyer unit to wind the cable, a direction change roll unit disposed immediately above the flyer unit for changing the cable vertically fed from the flyer unit to a horizontal direction, a capstan roll unit disposed immediately above the take-up unit for smooth feed of the cable fed from the direction change roll unit to the take-up unit, and an over-twister unit disposed between the direction change roll unit and the capstan roll unit to stabilize twisting of the cable during travelling between the direction change roll unit and the capstan roll unit; and a rear portion of the frame including a driving the flyer unit, the ta