Abstract: A fail-safe system for a power-driven rotary lawn mower having a conventional, propeller-like blade utilizes a bearing assembly mounted upon the drive shaft and connected to the blade by cables. Upon accidental disconnection of the blade from the shaft during operation of the machine, the cables will catch the blade and prevent its ejection, and will thrust the bearing assembly against a retaining collar rigidly mounted upon the shaft outwardly thereof. The bearing will permit free-wheeling action of the blade while retarding rotation relative to the shaft, thereby safely retaining it until the operator has an opportunity to stop the machine.

Abstract: A crop engaging device for conveying and/or treating crop comprises a support means and a plurality of outwardly extending crop engaging elements. The support means may comprise a rotor with the crop engaging elements extending outwardly from the rotor center, or a stationary supporting plate with outwardly extending elements which protrude into a flow of crop driven by other means. An array of crop engaging elements is attached to a transverse support bar which is substantially transverse to the principal direction of crop flow. All the elements in the array are inclined at the same angle to the transverse support bar. Elements of succeeding bars may be inclined in opposite directions to each other or inclined in the same direction. The device finds use in crop conditioning apparatus, crop pick-up and conveying apparatus, particularly where an alignment effect is required, and grain threshing apparatus.

Abstract: A friction spinning device has a pneumatic fiber transport passage or channel inclined at an angle to a perforated friction spinning element and a yarn formation position of the perforated friction spinning element is located at a spacing from an opening of the pneumatic fiber transport passage or channel. In such a friction spinning device, it is desired to ensure that the fibers located on the perforated friction spinning element are transported towards the yarn formation position neither parallel to nor at right angles to the yarn formation position. For this purpose, the perforations of the perforated friction spinning elements are so arranged that straight lines joining the perforation centers are disposed neither parallel to nor at right angles to the yarn formation position. In this way, fibers transported onto the perforated friction spinning element are laid on such perforated friction spinning element in the direction of the rows of perforations due to the intensity of the transporting air.

Abstract: A heat management system is provided for a gas turbine engine (10) having first and second oil cooling loops (14, 16). The system distributes excess fuel flow from a main fuel pump (44) among a plurality of upstream locations (58, 60, 68) for managing the transfer of heat between the oil loops (14, 16) and the flowing fuel. A diverter valve (62) regulates the distribution of the bypass fuel responsive to engine heat generation, oil temperature, and/or fuel temperature. A passive fuel distribution configuration using one or more fuel flow restrictors (72, 74, 76) is also disclosed.

Abstract: A fuel and air injection system for a turbojet engine is disclosed wherein a bowl-shaped member surrounding the fuel injection nozzle defines an impact cooling chamber divided into four sectors. A pair of diametrically opposite sectors have openings to permit air to pass through the cooling chamber into the combustion chamber, while opposite diametrically opposed sectors have openings of larger diameter which also allow communication between the cooling chamber and the combustion chamber. A diaphragm control system allows the air passing into the sectors having the larger diameter openings to be modulated depending upon the throttle setting of the turbojet engine.

Abstract: An engine has a compressor of variable capacity under command of a control system that regulates the output of the compressor for maintaining constant, at an adjustable value, the air pressure supplied from the compressor to plural combustion chambers of variable volume. A control system regulates the volume of the chambers in proportion to the charge of fuel injected in order to maintain constant, at an adjustable value, the air/fuel ratio at any load of the engine. Power cylinders are each provided with a reciprocating piston driven by combustion gases, each power cylinder being associated with at least two combustion chambers that are alternately fired, and from which combustion gases pass through valvings to the respective power cylinder. An accumulator stores compressed air during a braking mode of operation for subsequent use during super-power output modes of operation.

Abstract: An outlet section for a turbofan gas turbine engine (10) includes an internal flow separator (24), and a small convoluted mixer (28) for initiating mixing between the coaxial fan air stream (22) and hot core engine exhaust gas (26). Mixing is enhanced by an increasing-decreasing diameter nozzle plug (38), having a maximum diameter (40) proximate the annular outlet opening (16). The downstream edge (42) of the outer engine fairing (14) is turned radially inward for enhancing forward thrust in cooperation with the decreasing diameter surface (18) of the plug (38).

Abstract: A liquid-propellant delivery system using low-pressure propellant storage tanks instead of heavier high-pressure tanks. Liquid propellant material is pumped from the low-pressure tanks by a solenoid-actuated high-pressure pump, and delivered to the rocket engine through a pressure-actuated injector valve.

Abstract: The invention relates to a hydrostatic power steering unit of the type having a gerotor gear set forming a metering motor and a valve unit for routing pressurized fluid from an inlet port selectively via expansible chambers of the gerotor gear set to either one of two motor ports while connecting the other one of the motor ports to an outlet port. The housing of the valve unit, which has inner and outer rotary sleeve members, is arranged adjacent the gerotor gear set. A cardan shaft connects the outer sleeve member to the gerotor star member, a gear head connected to the adjacent end of the outer sleeve is disposed internally of the inner sleeve member. Supply and drain ports and motor ports connectable to an external servomotor are provided in a cover plate which is fastened to the gerotor gear set on the side thereof opposite from the valve unit.

Abstract: A multi-function valve usable in a hydrostatic transmission and having valve components mounted in a single valve body to provide pressure limiter and high pressure relief functions and with the structure also providing a bypass function and for supply of makeup fluid to the hydrostatic transmission. The multifunction valve has a charge check valve member and a relief valve member in associated relation and movable upon the occurrence of a predetermined pressure differential thereacross to perform control functions. One pressure differential results from a flow through an orifice and with the flow being controlled by a poppet valve member normally held closed by a heavy spring which establishes a system pressure at which the pressure limiter function will occur. With this structure, the pressure limiter function occurs in advance of the high pressure relief function and under the control of a single heavy spring.

Abstract: The valve disclosed herein functions as a flow matching device. By employing such a valve, hydraulic systems may be implemented in which filling and emptying of a variable volume load, such as a hydraulic piston, may be accomplished through simple check valve structures at controlled flow rates.

Abstract: A hydrostatic transaxle assembly T is disclosed including a pump (11), a manifold portion (13), and right and left motor axle assemblies (15 and 17). Each of the motor axle assemblies includes a radial ball motor (41), the output of which is the input to a gear reduction section (53). Each gear reduction section (53) includes primary and secondary planetary gear sets (55) and (57) including a planet carrier (79) driving the respective axle shaft. The transaxle assembly T includes a locking differential and parking brake mechanism (87) which comprises an engagement mechanism (89) and an actuation mechanism (91). When the engagement mechanism (89) is disengaged, the motor assemblies (15) and (17) are free to operate at different speeds for normal differentiation. The actuation mechanism (91) can be actuated to either a locking differential mode (FIG. 8) or a parking brake mode (FIG. 9).

Abstract: Auxiliary compressed air is supplied to an inlet manifold (3) of an internal combustion engine (1) by an auxiliary compressor (8), driven from the main shaft of the ICE. A controlled clutch (17) is interposed between the engine (1) and the auxiliary compressor, the clutch being controlled by a memory and controller (18) receiving inlet manifold pressure signals (P) and fuel quantity signals (F) and providing output control signals to the controlled clutch (17) based on stored functions or tables within the memory and controller to provide for desired and optimum operation of the engine with appropriate charge air in view of injected fuel quantity. The compressed air derived from the auxiliary compressor (8) is injected into the main compressor to impinge on the vanes or blades (15) of the main compressor (6).

Abstract: An ice-cream maker with a cylindrical container (1), inside which at least one cooled surface is provided for ice-cream formation, and with an electric motor (4), which through a gear unit (5) drives a shaft (6) running central to the container, said shaft bearing a scraper and stirrer tool (8) acting at least together with the cooled surface. An autosynchronous single-phase motor is provided as the electric motor and the scraper and stirrer tool has for both directions of rotation of the shaft at least one scraper and stirrer tool section (10,11) effective principally in the relevant direction of rotation.

Abstract: In an air conditioner for automobiles, control unit for performing feedback control of blow off air is constructed in the form of an integral-added optimal regulator (M4) which performs the feedback control on the basis of optimal feedback gain predetermined according to dynamic model(s) of an air conditioning system including the vehicle compartment (M1) and the used air conditioning unit (M2). According to another feature of the present invention, an environmental condition, such as solar radiation to the vehicle compartment (M1), is detected to further accurately control the internal air temperature. In one embodiment, the internal variables including optimal feedback gain of the integral-added optimal regulator (M4) are changed in accordance with the variation in the dynamic model depending on the detected environmental condition.

Abstract: An air conditioning or refrigeration system having a subcooler (18) for subcooling liquid or hot gaseous refrigerant before the refrigerant is supplied to a heat exchanger, such as an evaporator (24) or a condenser (14). The refrigerant subcooler or precooler (18, 18A, 18B) utilized in the method and apparatus of the refrigeration system has an inner cylindrical housing (38, 38A) positioned in concentric relation to an outer cylindrical housing (48, 48A) and forming an annulus (53, 53A) therebetween. A small portion of refrigerant is diverted from the main body of refrigerant at the subcooler (18, 18A) and is passed through an expanison valve (32, 32A) for vaporizing upon entering the subcooler (18, 18A).

Abstract: A cryogenic support member is comprised of a non-metallic rod having a depression in at least one end and a metallic end connection assembled to the rod. The metallic end connection comprises a metallic plug which conforms to the shape and is disposed in the depression and a metallic sleeve is disposed over the rod and plug. The plug and the sleeve are shrink-fitted to the depression in the rod to form a connection good in compression, tension and bending.

Abstract: Methods for circular weft knitting of variegated articles and selectively programmable circular weft knitting machine apparatus for carrying out such methods including apparatus for effecting selective, controlled two dimensional displacement of compound needle member components and associated sinker elements so as to provide each such needle member with the selectable capability of performing a knit, tuck or float operation at each yarn feed location independent of the direction of knitting needle approach thereto.

Abstract: A washing machine comprising a tub (4), a wash basket (5) and a housing (12) for collecting the wash water. A heating element (14) and a thermostatic sensor (15), as well as a recirculation pump (17) are connected to the housing (12) and to the tub (4) through a recirculation conduit (16) in order to circulate the wash water repeatedly toward the tub (4) with the object of spraying the same onto the load to be washed. The machine is moreover equipped with pressure switches (36,23) for carrying out "vigorous" and "delicate" laundering procedures in the conventional way, and has a series of pressure switches (21, 22) for developing "vigorous" wash cycles with low water levels in the tub (4) carried out by recirculating the same water toward said tub. In this way, optimum consumption of water, detergents and electric energy is achieved dependent upon the kind and quantity of load placed in the wash basket (5).

Abstract: An anti-theft device for road vehicles comprises a yoke having a solid extension or block for positioning below the brake pedal with the brake arm extending through the yoke. An elongated rod member is connected to the yoke and has an inverted generally U-shaped upper end for hooking over a spoke of the vehicle steering wheel and an externally threaded lower end which receives an intermediate connector member having an outwardly extending tab. The intermediate connector member may be secured at selective distances relative to the upper end of the rod to fit various vehicles. The block or extension and the intermediate connector are pinned together with a lock pin and secured with a padlock. The anti-theft device in the locked position provides a mechanical interlock between the vehicle steering wheel and the vehicle foot brake pedal to prevent rotation of the steering wheel, and between the foot brake pedal and the floorboard of the vehicle to prevent the brake pedal from being depressed.

Abstract: A vehicle protective guard with an arm and a carrier member which in assembled relation encircles the housing of a steering column. When assembled a stop on the arm underlies the transmission shift on the steering column to prevent sufficient movement of the lever to engage the transmission. The stops on the arm also project into the path of spokes on a steering wheel to limit the extent to which the wheel can be turned to steer the vehicle. To facilitate installation and use of the guard the arm is removably connected to the carrier by a hinge joint which permits the arm to pivot to locking and released positions.

Abstract: A reversible mortise lockset for use with an ornamental metal security storm door furnished with a lock box, each of the two opposed vertical walls of the lock box having two vertically aligned holes of equal diameter. The lockset includes a mortise lock which can be inserted into the lock box in either of two alternative orientations, namely, the lock cylinder hole of the mortise lock in registry with the upper holes in the lock box or the lock cylinder hole of the mortise lock in registry with the lower holes in the lock box. In either orientation, the door knob spindle hole and a through bolt hole of the mortise lock are exposed through the lock box holes not in registry with the lock cylinder hole. A pair of plates are provided for mounting on the exterior surfaces of the lock box walls, each plate having a door knob and spindle near one end and a lock cylinder hole near the other end. One of the plates has a single mounting post projecting parallel to the door knob spindle.

Abstract: An improved clutch apparatus for a spring forming machine is disclosed having two independently-operating, one-way clutches (i.e., one left hand and one right hand clutch) which commonly drive a pair of wire feed rollers through connecting gears such that 360.degree. of machine use is provided. That is, while one clutch is operating to feed wire, the other clutch is in a return mode such that both clutches constantly reciprocate in a sequential manner thereby permitting continuous wire feeding and forming. Due to the common gear connection, the associated dual feed rollers are operated by whichever clutch is in the drive mode at a given time.

Abstract: A pullback type indirect extrusion press capable of extruding a tubular article, the press including first and second movable platens connected to each other by columns, the movable platens being arranged in front of and behind a fixed platen, a mechanism for producing a extruding force provided above and below or the left and right between the fixed platen and the first movable platen, and a container device and a die stem arranged between the fixed platen and the second movable platen. A piercing cylinder mechanism is provided on the axis of the press on the side of the non-extrusion zone, the piercing cylinder mechanism being provided independently of the mechanism for producing the extruding force.

Abstract: A method of forming a container in one or more double acting presses includes the steps of blanking, drawing an inverted cup and reverse drawing the inverted cup while retaining a flange thereon at a first station and then transferring the cup to a second station where the cup is drawn to an inverted configuration and then reverse drawn to form a finished container again retaining the flange throughout. The drawing operations at each station are performed in a single stroke of the press. The apparatus at the first station includes a blank and draw punch and a fixed, hollow die core ring with the punch telescoping over the ring to form the inverted cup and a draw horn telescoping within the ring to reverse draw the cup. The apparatus at the second station includes a hollow redraw sleeve and a pressure sleeve telescoping over the redraw sleeve to invert the cup and a profile punch telescoping within the redraw sleeve to reverse draw the cup.

Abstract: In a wire and band processing machine, a drive system is positioned on one side of a processing plate and a fastening arrangement is provided for mounting processing units on the other side of the processing plate. The processing units are connected to the drive system through holes in the processing plate. The drive system includes at least one worm shaft extending parallel to the processing plate and a worm gear can be releasably positioned in meshed engagement with the worm shaft. The axis of the worm gear extends perpendicularly to the processing plate and to the worm shaft.

Abstract: In a ram press for manufacturing shells for can ends, a relatively flat shell is transferred from a tooling station to a destination. The shell is supported at the first station from the upper tooling work surface, from which it is propelled in edgewise fashion into a transfer path. The transfer path is at least partially enclosed and extends from an entrance adjacent the first station tooling toward the shell destination. An air assist mechanism is provided for acting upon the shell moving into and along the path, and includes an outlet conduit connected to a supply of air under pressure. The conduit includes an open outlet end. A valve is disposed the outlet conduit for controlling flow of air along said conduit. The outlet conduit is disposed with its outlet end at one side of the entrance to the transfer path, with the end positioned in a direction into the path, whereby air is directed along said path in the direction of movement of the object. The air facilitates movement of the shell along the path.

Abstract: A guiding arrangement is provided for guiding the movement between the frame and other components of a forging press during the up and down movement that takes place during each forging press cycle. Upright left and right columns of the frame are constructed of multiple layers of tie-rods which are spaced from each other by the thickness of crosshead plates with which they are interlaced. The guiding arrangement includes a plurality of metal segments, resembling triangular plates, located between the tie-rod plates of the columns and pivotably mounted thereto. Each metal segment has a smooth edge which is oriented to slide smoothly up and down on sliding plates which are connected to forging press components. The pivoted mounting of the metal segments is inherently self aligning and the accessibility of the metal segments permits easy maintenance and repair.

Abstract: A suspension system (11) for effectively decoupling an oscillating element microbalance (10) from its environment employs longitudinally extending suspension members axially aligned with an instantaneous center of rotation (S) of the microbalance. In a preferred embodiment, the microbalance includes a tapered elongate elastic element (12) having an elliptical cross section and the suspending members comprise a torsion bar arrangement (20, 22) oriented parallel to the major axis (HD) of the elliptical cross section. The suspension system minimizes vibrational losses from the microbalance while at the same time rendering environmental noise ineffectual.

Abstract: An impact test apparatus includes a barrel adapted to contain pressurized gas and having a sealed end and an opposed open end. A shuttle including a bore for carrying a test sample is positioned for translation within the barrel. A seal is provided on the shuttle for sealingly engaging the barrel. The seal divides the interior of the barrel into a portion open to the atmosphere and a sealed portion. A trigger element selectively retains the shuttle in a fixed position within the barrel and permits the shuttle to be released to accelerate toward the open of the barrel as the pressurized gas in the sealed portion of the barrel expands. Brake rings are located proximate the open end of the barrel to decelerate the shuttle and retain the shuttle substantially within the barrel while allowing the test sample to travel towards a target aligned with the open end of the barrel. The impact test apparatus permits reliable and reproducible impact testing of projectiles without the use of towers or explosive charges.

Abstract: A flow path in a flow analyzing apparatus is branched into two or more branch flow paths. In one of the branch flow paths, a flow path blockage detector and an electrolyte measuring electrode are disposed, and in the other branch flow path, a gas measuring electrode is disposed. When a liquid sample is introduced into the flow paths from a sampling nozzle of the common flow path, the blockage detector detects whether a blockage is occuring. If the blockage is detected, the blockage is removed by feeding a cleaning fluid into the common flow path in a direction opposite to the flow of the sample. Following this, the sample is introduced into the other branch flow path. By this operation, the pressure in the other branch flow path is not reduced abnormally, and thus normal operation of the gas measuring electrode can be maintained.

Abstract: A device for measuring the absolute value of the density of salts in an atmosphere, which comprises an airtight water tank containing super pure water; a means for supplying super pure water to the airtight water tank; a means for bubbling a predetermined quantity of air in the atmosphere into the super pure water being provided in the airtight water tank; a means for exhausting the super pure water in the airtight water tank after the bubbling; a sodium ion analyzer for measuring the density of sodium ions in the exhausted super pure water; and a means for introducing the outside air to the bubbling means in accordance with the pressure difference between the inside and the outside of the water tank.

Abstract: For controlling the dye receptivity or color absorption capacity of textile goods by means of air or sound, a web is continually guided between transmitter and receiver, and measured values determined at various locations of the web are compared with each other.

Abstract: A storage tank system especially useful for storing liquid gasoline in one aspect comprises a rigid inner tank encased by a flexible outer jacket with a leak detecting means associated with the closed space between the inner tank and jacket. In another aspect, an outer rigid tank contains a bladder within it together with leak detecting means between the tank and bladder. The system results in a storage facility which is less likely to lose its stored liquid to the environment due to a slow leak or a sudden large leak such as is possible with an earthquake.

Abstract: A method for rapidly transferring chromatography or adsorption column eluates in a continuous flow directly to the chromatography plate for continuous evaporation of the solvents at a rate compatible with the flow.

Abstract: A semiconductor device comprising a semiconductor body having a depression formed into the first surface of the body. The device further comprises member means comprising first and second thermal-to-electric transducer or static electric element, the member means having a predetermined configuration suspended over the depression. The member means is connected to the first surface at least at one location, the depression opening to the first surface around at least a portion of the predetermined configuration. The depression provides substantial physical and thermal isolation between the elements and the semiconductor body. In this manner, an integrated semiconductor device provides an environment of substantial physical and thermal isolation between the transducer or element and the semiconductor body.

Abstract: A measuring device housing includes two mutually assembled housing shells having mutually engaged dust protection edges, a trowel shape with a relatively narrow handle-type holder part changing into a relatively wide plate-type indicator part, an operating surface having sides, a switching wheel operating element mounted on the operating surface and extending beyond one of the sides thereof, and another operating element disposed on the operating surface laterally of the switching wheel, the operating elements being disposed within the swinging range of a thumb of the right hand of an operator of the measuring device gripping the holder part from behind for actuating the operating elements.

Abstract: A tube straightness checking apparatus includes a gauging mechanism disposed along a linear path and being operable to check the straightness of the tube as it is moved along the path past the mechanism. The gauging mechanism is operable to detect deviation of the tube from an imaginary centerline which is generally coincident with the linear path. The apparatus also includes linear hearing sets which guide a tube along the generally linear path past the gauging mechanism. Two embodiments of the gauging mechanism are disclosed. In the preferred embodiment, the gauging mechanism includes a gauge plate with a circular gauging orifice defined therein through which the tube passes as it is moved along the linear path. The gauge plate is electrically conductive and forms part of an electric circuit which is operable to provide an indication of an out-of-straightness condition upon the tube contacting the gauge plate as the tube moves along the linear path through the gauging orifice of the plate.

Abstract: Apparatus and method for detecting voids and particulates in a fluid within a containing vessel. A diffuse ultrasonic signal is coupled into the fluid by a first transducer and the portion of the ultrasonic signal transmitted through the fluid is detected by a second transducer. The received signal is analyzed by a processor to determine the void fraction of the fluid responsive to the attenuation of the received ultrasonic signal. In addition, voids and particulates are detected by evaluating the increase in side-band energy of the received signal.

Abstract: A fluid pressure sensor includes a body made of a soft magnetic material with a groove formed therein, and a coil is installed in the body in the groove. One magnetostrictive disc is placed on the body over the groove, and two non-magnetic discs are placed over the magnetostrictive disc. A casing is provided for accommodating the body carrying the coil, the magnetostrictive disc, and the non-magnetic discs, and it is closed by a lid member which has a surface for receiving a fluid pressure. A plurality of through holes are formed in the lid member within the fluid pressure receiving surface such that the through holes extend to the non-magnetic disc at position over the groove, whereby the magnetostrictive plate is partially distorted by the fluid pressure.

Abstract: A columnar vortex generator is set in a duct communicating with an intake pipe of an engine, to extend across the airflow in the duct. A vortex sensor is arranged in a downstream surface of the vortex generator. The sensor generates a signal corresponding to the frequency of Karman vortexes generated at the downstream side of the vortex generator. A turbulence generator for generating a turbulent flow in that part of intake air flowing against the vortex generator is set at the upstream side of the vortex generator. The vortex generator consists of stationary and movable units. The movable unit is moved in accordance with elongation/contraction of a bellows so as to vary the typical dimension D of the surface of the vortex generator against which air flows.

Abstract: A sensing probe 10 for use in determining fluid flow rates along a duct 11 comprises a probe pipe 12 mounted within a wall of the duct 11 to extend thereacross. A plurality of total pressure orifices 17 are provided through the probe wall, to face fluid flow, and a single static pressure opening 18 is provided on the downstream side of the probe. An averaging tube 19 is mounted within the pipe and has two openings 20 suitably disposed with respect to the duct axis so that the pressure within the averaging tube closely approximates to the average total pressure for the flow rate determination. The static pressure orifice 18 communicates with a further tube 23 within the pipe, to allow sensing of a pressure directly related to the actual static pressure.

Abstract: A valve including a valve body having a surface with a plurality of orifices with a resilient closure membrane adjacent thereto is disclosed. The membrane is positioned to yield in response to a pressure differential so as to permit flow between respective ports. A male closure member is mounted to selectively urge the membrane into contact with the periphery of an orifice in order to prevent liquid flow therethrough in accordance with a desired flow arrangement. Further refinements include spring biasing of the closure mechanism, which in one construction has a movable carriage provided with a roller.

Abstract: A stabilized platform which is suitable for stabilizing the bore-sight of a communications antenna or the like, is provided with a pendulous mounting which holds the structure erect. A pair of gyroscopes give active control of the attitude of the platform, and are coupled to the platform via a gear arrangement. When the platform is rotated rapidly (to unravel feed cables or to permit overhead tracking of the antenna) the gyroscopes experience a much lesser degree of movement which is determined by the gearing ratio, such that the gyroscopes are not destabilized.

Abstract: The invention is a system to counterbalance the static torque produced by a weight mounted to a beam member which in turn is rotatably mounted to a frame member, the beam member rotatable about the axis of rotation which is substantially aligned with the longitudinal axis of the frame member. The system comprises a support member rotatively mounted to the frame member and coupled to the beam member for simultaneously rotation about the axis of rotation. A pressurizable power actuator having a first end pivotally mounted to the frame member and a second end having an output shaft for producing an output force proportional to the pressure level within the actuator. A coupling device is included connecting the output shaft to the support member. A pressure level control system is provided for maintaining the pressure level within the actuator to produce a torque sufficient to counterbalance the torque produced by the weight.

Abstract: A power-assist device for an automotive steering system employs spool valves of substantially identical construction and identical size to control the fluid pressure in smaller and larger area chambers of an unbalanced cylinder. For compensating difference of effective area between smaller and larger area chambers, the position of bores defned in a housing of a pressure control valve for receiving the spool valves are differed from each other so that the spool valve opening and closing an induction path for the smaller area chamber and opening closing a drain path for the larger area chamber moves at greater magnitude than that of the other spool valve which opens and closes an induction path for the larger area chamber and opens and closes an exhaust path for the smaller area chamber.

Abstract: The angle drive transmission unit comprises a box-like housing defining first and second chambers in communication with each other and accommodating respectively an input shaft and an output shaft perpendicular to each other and carrying respectively first and second bevel gears in mutual mesh engagement. A peculiar feature of the invention is that the bearing associated with the inward end of the input shaft is carried in a seat defined by a closure cover of the box-like housing and detachably affixed to the box-like housing through elastically deformable means.

Abstract: A composite gearwheel structure for reciprocating the gripper-carrying straps in weaving looms, comprises a gearwheel body of synthetic plastic material. Its teeth are partially covered with sheet metal associated with the body and forming an integral part thereof.

Abstract: A gear assembly having first and second gears in constant mesh with each other, the second gear being divided into two gear elements by a plane perpendicular to the axis thereof. A passage through which lubricating oil flows is formed between these two gear elements. The passage preferably consists of a radial groove formed on a surface of one of the two gear elements to extend in a radial direction from the inner surface of the gear element, an annular groove formed on the surface to extend in a circular direction about the axis of the gear element and communicate with the outer end portion of the radial groove, and a clearance formed between the two gear elements and surrounding the annular groove.

Abstract: Disclosed is a wrist mechanism for an industrial robot which includes a first wrist member disposed rotatably at the tip of a robot arm and a second wrist member movable relative to this first wrist member. The movement of the second wrist member relative to the first wrist member is effected not in a bending mode in which the angle of intersection between the members is variable but in a rotating mode in which the second wrist member becomes rotatable. The transmission of the rotational power to the second wrist member is effected through a universal joint. With this arrangement, such backlashes as are conventionally found in the engagement between gears can be reduced, and the mechanical burden on the universal joint can also be reduced.