Abstract: A scanner and associated method for detecting pressures on a test member are provided. The scanner can be provided with an electronic module that includes an analog-digital (A/D) converter associated with each channel of the scanner and configured to provide digital signals representative of the pressures detected by pressure sensor elements associated with various locations on the test member. The electronic module can also include amplifiers and/or a multiplexer so that the output of the scanner provides an amplified and/or multiplexed digital output signal representative of the detected pressures. In some cases, the A/D converters and amplifiers can be provided in a single, mixed-signal chip of the scanner. The scanner can be small enough to be disposed in various locations in the test member, including small spaces that are generally incapable of accommodating conventional test equipment.

Abstract: System for transmitting pressures between a detachable part (2a,2b) and a fixed part (1) of a model in a wind tunnel, which presents pressure tapping holes (3a-3h) and pressure outlets (5a-5h) in the detachable part connected together by means of internal conduits (4a-4h), and pressure inlets (7a-7h) in the fixed part (1) connected to a pressure measuring module via pressure transmission ducts (8a-8h) and pressure transmission conduits (9a-9h), in such a way that when the two pieces are coupled by coupling means (6), the pressure outlets (5a-5h) are facing the pressure inlets (7a-7h), with a sealing joint 10 existing between them with passage holes (10a-10h), the entire unit permitting the transmission of pressure from the detachable part (2a,2b) to the fixed part (1) without any need for pipes or connectors.

Abstract: An air data sensor that determines a body's angle of attack, static air pressure, total air pressure, mach number, static air temperature and true air speed in one device using pressure and temperature readings. The air data sensor includes a probe that protrudes into an airflow to collect data, a base plate for attaching the probe to a body, and an electronics housing including electronics for interpreting the data collected from the probe.

Abstract: The arrangement relates to a hot-film mass flow meter for recording the flow rate of a flowing medium in the intake tract or the charge air tract of an internal combustion engine. A substrate part is provided, that accommodates a sensor chip, which is allocated to a channel that has flowing through it at least one partial mass flow of the flowing medium. The sensor chip extends into channel that has flowing through it the partial mass flow of the flowing medium. The substrate part is formed either as a separately extruded plastic tongue or as a cavity extruded of plastic material. The sensor chip is integrated downstream with respect to a flow direction of the flowing medium, so as to lie behind a leading edge.

Abstract: The present invention discloses a device for observing a flow state comprising a translucent duct. It further comprises an irradiation unit irradiating projection light, a condensing unit condensing the projection light along a length direction with respect to an axial core area of the translucent duct in which a fluid flows; and an image pickup unit for picking up images of scattered reflected light from an axial core area of the translucent duct at a plurality of times.

Abstract: The present invention relates to a method and an apparatus for measuring the liquid level in a container of a fuel cell, comprising: a container, a plurality of sensors and a circuit device. The container has a chamber for storing the liquid fuel. These sensors are respectively electrically connected to the circuit device and respectively comprise means for measuring the liquid level, so as to provide the liquid level information. The circuit device has a logical calculator for converting the electrical signal related to the liquid level information into the electrical signal related to the quantity of the liquid fuel. By measuring the liquid level via these respective sensors, a plurality of reference points corresponding to the liquid level can be obtained, and the amount of the liquid fuel remaining in the container can be determined by means of conversion of the electrical signal related to respective reference points by the logical calculator of the circuit device.

Abstract: An integrated sensor array has a substrates, at least one sensor element, and a signal processing device integrated in the substrate and connected or capable of being connected with the sensor elements. A layer having a measuring surface is capable of being detachably bonded to the substrate so that a signal emitted from the measuring surface is capable of being processed by the signal processing device when the layer is bonded to the substrate. The substrate has at least one feedthrough hole abutting with the layer, which feedthrough hole is connected or capable of being connected to a vacuum generating device in order to bond the layer to the substrate by suction.

Abstract: One embodiment of a propeller tuner assembly (10) formed in accordance with the present disclosure includes a frame (12) and a bearing assembly (64) having a coupler (90) adapted to selectively couple a propeller (20) to the frame (12). The coupler (90) is selectively movable from a first position where at least a portion of the coupler (90) is substantially isolated from tuning loads applied to the bearing assembly (64).

Abstract: A surface acoustic wave sensor for detecting a target substance by measuring the change in frequency due to the mass applied to a reaction membrane placed on a surface acoustic wave element has high sensitivity due to the improvement of the structure surface acoustic wave element. The surface acoustic wave sensor includes an SH-type surface acoustic wave and a rotated Y-cut LiTaO3 substrate having Euler angles (0°, 0° to 18°, 0°±5°) or (0°, 58° to 180°, 0°±5°), electrodes, principally containing Au, for exciting a surface acoustic wave, the electrodes being arranged on the LiTaO3 substrate, and a reaction membrane, bound to a target substance or a binding substance bound to the target substance, covering the electrodes arranged on the LiTaO3 substrate. The interdigital transducers have a normalized thickness of about 0.8% to about 9.5%, the normalized thickness being determined by normalizing the thickness of the interdigital transducers by the wavelength of the surface acoustic wave.

Abstract: Techniques are described for eliminating the potential continuity errors in fluid connection devices, such as tubes, which can arise in complex systems where many tubes are used. The techniques are based upon the use of ultrasound, light or pressure waves being transmitted along the connecting device using a transmitter and a receiver at either end. Methods are described to cover the external coupling of the transmitter and/or the receiver into the tubing thereby eliminating the need to compromise the connection. The described apparatus can be external to the system or integrated within it. The potential to carry information along the connection device is also disclosed.

Abstract: An apparatus, system, and method are disclosed for protecting a motion-sensitive device. The apparatus includes an identification module, a determination module, and a scheduler. The identification module identifies a use-intensive task involving the motion-sensitive device. The determination module determines a motion forecast that predicts a substantially motionless time interval. The scheduler schedules the use-intensive task such that the use-intensive task executes within the substantially motionless time interval. In this manner, a historical movement pattern is used to schedule future tasks such that the coincidence of task use of the motion-sensitive device and movement of the motion-sensitive device is minimized.

Abstract: An acoustic wave sensor system, comprising a plurality of acoustic wave sensing devices for detecting a multiplicity of varying conditions and a common interrogation component that communicates with each acoustic wave sensing device among the plurality of acoustic wave sensor devices for providing an interrogation signal to each acoustic wave sensing device thereof. A transmitter and receiver unit can also be provided that communicates with the common interrogation component and the plurality of acoustic wave sensing devices and which transmits an interrogation signal from the common interrogation component to the at least one acoustic wave sensing device among the plurality of acoustic wave sensing devices and which receives sensor data from at least one acoustic wave sensing device.

Abstract: The invention relates to pseudo porosity standards, and methods for their manufacture and use, which substantially mimic the effect porosity has on ultrasonic sound as it passes through a composite laminate. An ultrasonic inspection reference standard for composite materials having porosity may include a member having at least one thickness and at least one mesh. The member may be manufactured from a fiber-free polymer resin using a stereo lithography process. Use of the mesh produces a standard which transmits ultrasonic energy, with the mesh scattering and attenuating the energy. The manufactured reference standard may replace more costly porous, fiber-reinforced, composite reference standards in the aircraft industry and in other non-aircraft applications.

Abstract: In a vibration sensor for outputting, as vibration signals, variations of capacitance between a fixed electrode and a diaphragm 3 electrode opposed thereto, the diaphragm electrode 3 has slits 3a formed in the same plate member to define a diaphragm portion 3b positioned centrally to be vibrated and displace only by gravity, a fixed portion 3c positioned peripherally, and elastic support portions 3d for connecting the diaphragm portion 3b to the fixed portion 3c.

Abstract: Thickness of a pressure-detecting piezoelectric substrate (2) that is thinner than that of a supporting piezoelectric substrate (3) and that has a surface acoustic wave element for pressure detection (7a) on its lower surface is mounted on the supporting piezoelectric substrate (3) having a surface acoustic wave element for reference (4a) on its upper surface. A sealing member (5) is provided between the supporting piezoelectric substrate (3) and the pressure-detecting piezoelectric substrate (1). The surface acoustic wave element for pressure detection (7a) and the surface acoustic wave element for reference (4a) can be disposed in a space (S) enclosed with the pressure-detecting piezoelectric substrate (1) and the sealing member (5). It is possible to provide a small-sized pressure sensor device (1) that can perform temperature compensation and that has high reliability.

Abstract: A system is provided for sensing and monitoring pressure conditions and variations over an actual or represented surface area of a workpiece in a process chamber. The system includes a substrate and a plurality of micro-electrical-mechanical-systems (MEMS) pressure sensors fixed to the substrate.

Abstract: An exemplary pressure cavity is disclosed that is durable, stable, and biocompatible and configured in such a way that it constitutes pico to nanoliter-scale volume. The exemplary pressure cavity is hermetically sealed from the exterior environment while maintaining the ability to communicate with other devices. Micromachined, hermetically-sealed sensors are configured to receive power and return information through direct electrical contact with external electronics. The pressure cavity and sensor components disposed therein are hermetically sealed from ambient pressure in order to reduce drift and instability within the sensor. The sensor is designed for harsh and biological environments, e.g., intracorporeal implantation and in vivo use. Additionally, novel manufacturing methods are employed to construct the sensors.

Abstract: An overpressure vent in a transmitter housing of a process transmitter. The transmitter is configured for coupling to an industrial process and measuring a process variable. The transmitter includes an enclosure having a cavity formed therein. A process coupling is configured to couple the cavity to the industrial process. The overpressure vent is arranged to vent an overpressure in the cavity to outside of the transmitter enclosure.

Abstract: A load sensor includes fixed portions, a load bearing portion subjected to a load, and strain detecting elements each detecting a strain of a substrate in response to the load. In this load sensor, slits each of which can disperse a stress applied to the substrate in response to the load, are formed in the substrate.

Abstract: A composite material has a laminated structure of fiber-reinforced resin layers and films of a shape-memory alloy. A predetermined strain has been applied to each film. A damage sensor has a film of an alloy of nickel and titanium. An electric circuit is bonded to the film, and strain gages are connected to the electric circuit. The damage sensor can be laminated to the resin layers in place of the film of the shape-memory alloy. Damage to the composite material is suppressed as follows: A current is applied to the films of the shape-memory alloy, to monitor change in electric resistance of the films. The damage is located in response to the change in electric resistance. Another current is applied to a film of the shape-memory alloy for which the change is larger than the other films to generate heat for deforming the film to generate shrinking stress or shear stress to the damage.

Abstract: A strain sensor includes a load carrying body configured to strain in response to a load applied along a load path. The sensor further includes a magnetostrictive electrical conductor affixed to the body but out of the load path. Application of the load causes the body to strain, which in turn results in a proportional stress being imparted to the magnetostrictive conductor, altering its magnetic permeability. A circuit is coupled to the conductor to detect such changes in permeability, which are indicative of the applied load.

Abstract: Uniaxial deformation-measuring device includes a section of optical fiber equipped with a Bragg grating aligned with the measurement axis, and a test body subjected to the deformations to be measured, this device includes the fixing points for attaching the fiber to the test body. The fixing points are separated by a distance (Lfib) having a variation (?Lfib). When the test body is stressed by the deformation, the effective length (Lce) of the test body has an elongation (?Lce). The length (Lfib) of the section of optical fiber and the effective length (Lce) of the measurement body are such that the longitudinal deformation (?Lfib/Lfib) of the section of optical fiber is strictly greater than the originating deformation (?Lce/Lce) of the test body, thus defining an amplification factor K which is strictly greater than 1 and which is equal to the quotient (?Lfib/Lfib)/(?Lce/Lce) in the first order.

Abstract: A wireless, non-powered fatigue monitoring sensor uses a piezoelectric element that is attached to the surface of or embedded within a structure to be monitored. When subjected to stress over time, the material properties of the element change reliably and permanently. These properties are used to determine the fatigue history of the structure. The monitoring device requires no power for monitoring and is nondestructively queried to determine the stress history using wireless means such as radio frequency technology.

Abstract: A force measurement element measures an introduced force by means of a double flexural beam and a displacement sensor. The double flexural beam makes possible a double spring shape that makes possible an optimization with regard to elongation distribution.

Abstract: TThe present invention refers to a sensor holder (10) for arranging a sensor (32) through the wall and into communication with the inside of a housing (44). It comprises a first and a second component (12,14), the first component (12) being adapted to hold said sensor (32), the second component (14) being provided with a first sealing surface (36) and at least one throughgoing opening (38). A portion of the sensor (32) being adapted to extend from the first component (12), through the opening (38) in the second component (14) and into communication with the inside of the housing (44).

Abstract: A clamp-on measurement device, for attachment to a support, with at least one instrument transformer, a retaining device for holding the instrument transformer and a fastening device (4) for attachment of the retaining means to the support. The retaining device can be attached to the fastening device (4) such that the retaining device can be moved in at least one predetermined direction away from or toward the support and can be pivoted along a pivot axis which runs preferably perpendicular to the predetermined direction. This results in the clamp-on measurement device, after attachment to a support, being easily disengaged from the support for maintenance and repair purposes and then can be reengaged with the support without losing its original alignment.

Abstract: A test specimen holder includes at least one pair of wedges, a plurality of pistons and a tie bar connected to each of the pistons. A single cylinder body is operable with each of the pistons and the wedges. The cylinder body is adapted to urge the wedges together with relative movement of the cylinder body with respect to the pistons.

Abstract: [Object] An object of the present invention is to provide a technology to measure a flow rate more accurately by reducing an identification error when identifying the inner wall position from calculation result of flow velocity distribution in an ultrasonic flowmeter. [Organization] An ultrasonic flowmeter includes the fluid velocity distribution measuring means comprising: a graph output means for outputting a flow velocity distribution graph displaying the flow velocity in two axes of positions in the inner diameter direction of the fluid pipe relating to the measuring line and fluid velocities corresponding to the inner diameter direction; and an inner wall position calculating means for calculating the position of the inner wall with respect to the axis in the inner diameter direction; in which the flow rate operation means measures the flow rate of a fluid to be measured by integral operation based on the inner wall position calculated by the inner wall position calculating means.

Abstract: A device for measuring forces and moments acting on a body comprises a measuring structure (12) made up of one or more elements and provided with a plurality of connection elements or bindings (17, 18, 37) for connecting the elements of the structure (12) and/or a body (11) the stress of which one wishes to measure, such a structure (12) being statically determined or else statically non determined, such a structure (12) also being equipped with means for measuring (14), in one or more locations, the six stress magnitudes from which the force vector and moment vector acting on the body (11) can be worked out mathematically.

Abstract: A system for sampling air and collecting particles entrained in the air comprising a receiving surface, a liquid input that directs liquid to the receiving surface and produces a liquid surface, an air input that directs the air so that the air with particles entrained in the air impact the liquid surface, and an electrostatic contact connected to the liquid that imparts an electric charge to the liquid. The particles potentially including bioagents become captured in the liquid by the air with particles entrained in the air impacting the liquid surface. Collection efficiency is improved by the electrostatic contact electrically charging the liquid. The effects of impaction and adhesion due to electrically charging the liquid allows a unique combination in a particle capture medium that has a low fluid consumption rate while maintaining high efficiency.

Abstract: A system for sampling air and collecting particles potentially including bioagents entrained in the air for detection. The system comprises collecting a sample of the air with the particles entrained in the air, directing the sample to a receiving surface, directing a liquid to the receiving surface thereby producing a liquid surface, wherein the particles potentially including bioagents become captured in the liquid, and heating the liquid wherein the particles potentially including bioagents become heated to lysis the bioagents.

Abstract: A system for sampling air and collecting particles entrained in the air that potentially include bioagents. The system comprises providing a receiving surface, directing a liquid to the receiving surface and producing a liquid surface. Collecting samples of the air and directing the samples of air so that the samples of air with particles entrained in the air impact the liquid surface. The particles potentially including bioagents become captured in the liquid. The air with particles entrained in the air impacts the liquid surface with sufficient velocity to entrain the particles into the liquid but cause minor turbulence. The liquid surface has a surface tension and the collector samples the air and directs the air to the liquid surface so that the air with particles entrained in the air impacts the liquid surface with sufficient velocity to entrain the particles into the liquid, but cause minor turbulence on the surface resulting in insignificant evaporation of the liquid.

Abstract: A method for assessing a property or properties of a powdered or particulate material, which includes: containing the material within, or causing the material to flow through, a rotating vessel or chamber supported via a sensor indicative of force or weight, monitoring an output signal from the sensor as the container or vessel rotates and the material within the container or vessel moves, and assessing the material property by reference to the output signal of the sensor. Apparatus for assessing material properties is also disclosed.

Abstract: A low horsepower transmission is disclosed. In one embodiment, a drive shaft is operably coupled to a prime mover and a driven shaft is axially aligned with the drive shaft and operably coupled to a rotary load. Two sets of geared wheels are aligned and rotatably mounted to opposite sides of the drive shaft and the driven shaft. A shuttle clutch positioned on the driven shaft is operable to reciprocate between mating engagement with a clutch associated with the first set of geared wheels and a clutch associated with the second set of geared wheels. The engagement of the shuttle clutch determines which set of geared wheels will transmit torque.

Abstract: A six-gear or seven-gear dual-clutch transmission (1, 30) comprising two clutches (K1, 2) the input sides of which are connected with one drive shaft (2) of a prime mover and the output sides with each one of two input shafts (3, 4) disposed coaxially to each other, two countershafts (4, 5) upon which gear wheels designed as idler wheels are rotatably supported, gear wheels designed upon input shaft (3, 33, 37) and in tooth contact with idler wheels (8, 9, 10, 15, 16, 17, 34, 35, 36), coupling devices (22, 23, 24, 25, 31, 32) non-rotatably and axially movably supported on both countershafts (5, 6), and movable via setting devices and one output gear wheel (18, 19) on a respective countershaft (5, 6) which are in tooth contact with a toothing (20) on one differential transmission (21).

Abstract: A shift mechanism for a manual planetary transmission has a plurality of control members. Each control member has a slot configuration for each shift rail defined therein. The slot configurations are aligned among plates and a pin member is inserted in each of the slot configurations. Manipulation of any one of the plates produces movement of two or more of the pin members. The pin members are operable upon movement to select the engagement of the synchronizers, which are disposed within a power transmission. The synchronizers establish drive ratios between the input shaft for the transmission and the output shaft for the transmission.

Abstract: A starter is provided, which includes an intermediate gear connected to an intermediate shaft, and engaging with and driven by a pinion gear which is connected to an output shaft of a motor. The intermediate gear engages with a ring gear of an engine to crank up the engine when shifted together with the pinion gear in axial directions of these shafts via a retainer which is slidably supported by both of these shafts. A clutch supported by the shaft of the motor causes this shift by pushing the retainer in its axial direction. The clutch and the intermediate gear, each being defined by its outermost diameter, overlap with each other in the radial direction between these shafts. This overlap reduces stress acting on the retainer when the intermediate gear engages with the ring gear, thus reducing thickness of the retainer and the axial length of the starter.

Abstract: A transmission housing for an automatic transmission that includes a first and second plurality of circumferentially spaced inwardly extending sets of protrusions connected to an inner surface of the transmission housing configured to engage clutch assemblies of a planetary transmission. The sets of protrusions are offset from each other.

Abstract: A radial inner end of a retainer is spaced radially outwardly from a radial outer end of a sliding-contact region, and with this construction the axial movement of each needle roller is limited not by the retainer but by an inner ring, and a restriction flange. Therefore, a large axial force developing in the needle rollers is received by the inner ring and the restriction flange, and as a result, the retainer having low rigidity can be satisfactorily used. Therefore, any suitable material such as a synthetic resin can be selected for the retainer, and besides the wall thickness of the retainer can be made small.

Abstract: To provide a machine tool capable of processing a work to have a required thickness based on a simple structure without adjusting a distance itself between both cutting tools. A machine tool includes: a spindle rotating around a Z-axis extending in a horizontal direction; a tool post disposed in a movable manner in the Z-axis direction and an X-axis direction orthogonal to the Z-axis direction and in a pivotable manner around a B-axis orthogonal to a plane face containing the X-axis and the Z-axis; a tool having a pair of tips disposed to have a predetermined interval therebetween and fitted to said tool post; and a tool post control unit adjusting a pivot angle of said tool post so that an angle ? between a straight line connecting the pair of tips and the Z-axis comes to an angle corresponding to a finished thickness of a work.

Abstract: The invention includes a cermet composition represented by the formula (PQ)(RS) comprising: a ceramic phase (PQ) and a binder phase (RS) wherein, P is a metal selected from the group consisting of Si, Mn, Fe, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and mixtures thereof, Q is nitride, R is a metal selected from the group consisting of Fe, Ni, Co, Mn and mixtures thereof, S consists essentially of at least one element selected from Cr, Al, Si, and Y, and at least one reactive wetting aliovalent element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and mixtures thereof.

Abstract: High purity refractory metals, valve metals, refractory metal oxides, valve metal oxides, or alloys thereof suitable for a variety of electrical, optical and mill product/fabricated parts usages are produced from their respective oxides by metalothermic reduction of a solid or liquid form of such oxide using a reducing agent that establishes (after ignition) a highly exothermic reaction, the reaction preferably taking place in a continuously or step-wise moving oxide such as gravity fall with metal retrievable at the bottom and an oxide of the reducing agent being removable as a gas or in other convenient form and unreacted reducing agent derivatives being removable by leaching or like process.

Abstract: A method of recovering precious metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from a crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refractory sulfide minerals from the separated fines and adding the concentrate to the heap, bioleaching the heap to thereby oxidize iron sulfides contained therein, and hydrometallurgically treating the bioleached ore to recover precious metal values contained therein.

Abstract: A method of producing low cost high thermal conductivity graphitic foils includes the steps of providing a plurality of partially purified waste flakes formed during iron smelting, and compacting the plurality of waste flakes into a flexible foil material. A thermally conductive foil includes a plurality of partially purified pressed waste flakes derived from iron smelting, the foil having trace impurities characteristic of formation during iron smelting.

Abstract: A method for manufacturing a wrench handle includes preheating a work piece made of metal, with a layer of carbon scale being generated on the work piece during preheating. The preheated work piece is forged/pressed to form a wrench handle, with the carbon scale on the work piece being forged into upper and lower faces of the wrench handle. An indentation is formed on each of the upper and lower faces of the wrench handle. The carbon scale is then removed, leaving pits in the upper and lower faces of the wrench handle, with the pits concealed by the indentation sections.

Abstract: A method for manufacturing a wrench handle includes preheating a work piece made of metal, with a layer of carbon scale being generated on the work piece during preheating. The work piece is forged to form a wrench handle, with the carbon scale on the work piece being forged into a surface of the wrench handle during forging. The carbon scale is then removed, leaving a pitted area with a plurality of pits in the surface of the wrench handle. Finally, a concealment treatment is carried out, wherein the pitted area of the surface of the wrench handle is pressed inward to form an indentation section on the surface of the wrench handle for covering the pits.

Abstract: The device performs the function of opening and/or closing lids attached to containers, and more particularly child-proof lids in at least some embodiments. The device preferably includes a base, a post, a lever, a plate to engage the lid of a container, and a mechanism that converts movement of the lever to rotational movement of the plate against a lid. The conversion mechanism in at least some embodiments includes a spring.

Abstract: A bottle opener comprises a housing with a inner cavity therethrough; a pair of clamping handles whose upper portion are coupled to the lower portion of the housing and lower portion comprise clamping portions configured to mated with the neck of the bottle; an actuator; a first sliding block making reciprocating movement in longitudinal axis direction with respect to the inner cavity of the housing by the actuator; a helical screw assembly whose upper portion is mounted in the first sliding block by a bearing means and lower portion is free with rotation related to the first sliding block; a second sliding block contained only slidably in the inner cavity of housing and positioned between the bottom plane of the inner cavity and the lower surface of the first sliding block, having a screw passage through which screw can't pass unless it rotates; a latch means selectively latching or releasing the second sliding block with respect to the inner cavity in the longitudinal axis direction; a clutch means selectiv

Abstract: The present invention relates to devices and methods for removing a stop from a bottle. In certain embodiments of the present invention, a stabilizer is provided to prevent the stop from being pushed into the bottle and insert members are provided for removing the stop without the outside of the stop adhering to the inner wall of the bottle. Such embodiments allow, among other things, removal of the stop from the bottle without destruction or partial destruction of the stop, as is sometimes the case with conventional corkscrews, yet without the risk of pushing the stop into the bottle as is sometimes the case with non-corkscrew bottle stop removers.

Abstract: An improved fastener installation tool is provided of the type having a fixture pin for seated reception into a mating recess at the shank end of a threaded fastener, while a power-driven tool socket installs a threaded nut onto the fastener shank. The installation tool includes an improved spring-loaded clutch unit for normally supporting the fixture pin against rotation, but permitting fixture pin rotation in response to a torque load exceeding a predetermined limit thereby preventing fixture pin breakage. The clutch unit is adapted for quick and easy disengagement from the fixture pin, and pivotal displacement to an out-of-the-way position to permit quick and easy fixture pin removal and replacement.