Abstract: A stretch-forming machine of the type wherein a pair of opposed curving jaw assemblies grip opposite end edge portions of a metal sheet for initially stretching the metal sheet into a yield state and forming the metal sheet into a predetermined curved configuration. Each jaw assembly includes a jaw having an array of adjacent grippers or groups of grippers moveable relative to each other to define a part of the curve of the jaw and adapted to extend along one side edge of the metal sheet from adjacent a first corner to adjacent a second corner of the sheet, a moveable yoke connected to the jaw, a pivot connecting the yoke to a beam way, and at least one actuator connected to the yoke for pivoting the jaw about the pivot to urge the grippers at opposing ends of the gripper array away from the pivot while the grippers adjacent a centerline of the gripper array remain approximately stationary.

Abstract: A method for enhancing the accuracy of a sensor is provided. The method includes determining a measure of the output of the sensor, determining whether the measure falls outside of an acceptable range for the output of the sensor, and, when the measure falls outside the acceptable range, modifying the measure of the output such that the measure falls within the acceptable range for the sensor.

Abstract: A sensor for detecting erosion of a wear surface of a component, particularly a liner attached to the mill shell of a rotating grinding mill.

Abstract: An analytical apparatus for automatically carrying out a plurality of analytical steps, which apparatus includes: a releasing device for releasing a sample from a sampling tube; device for analysing a first portion of the released sample; a collecting device for collecting a second portion of the released sample; a device for re-released the collected said second portion of the sample; and a device for analysing the re-released portion of the sample.

Abstract: A system and a method for detection of trace amounts of airborne or deposited low-molecular weight compound(s), such as narcotics or explosives, comprising an electrically charged collector surface connected to an ionizer ionizing airborne particles with an electrical charge opposite to the charge of the collector surface, optional air-stirring means, extraction means for extraction of collected material from the collector surface, and equipment for chemical and/or biochemical detection of said compound(s) from said extracted collected material, is disclosed. Further, a modified ionizer/collector device wherein the collector is extended from the body of the device and is equipped with a preferably detachable, electrically chargeable collecting surface and wherein optionally the air-ionizing part of the device is also extended from the body of the ionizer/collector device, either together with or apart from, the extended collector arm, is described.

Abstract: A test apparatus for measuring the cohesive, adhesive and frictional properties of bulk solids has a bulk solid sample confined between two essentially parallel plates with a single load applied that produces both shear and normal stress and strain to the bulk solid in a manner that nearly uniformly distributes stress throughout the granular solid test region. The apparatus has a close proximity of the plates compared with the length of the plates in the direction of shear, the design of a load hanger to produce a resultant load near the shear plane, the roughening of any surface in contact with the solid that is not intended to have shear on it and involves one-directional movement of the parallel plates with respect to each other and the control of both the direction and magnitude of the applied load relative to the parallel plates.

Abstract: A glow plug (1), includes a pressure sensor (90), suitable for measuring the internal pressure of a motor cylinder in which the plug (1) is housed, a body (10) to be secured to the motor and a finger (20) in which a heater electrode is housed. The sensor (90) is firmly secured to the body (10) by the upper face thereof and rests on the finger (20), so that the pressure exerted on the finger (20) presses the sensor against the body (10).

Abstract: The present invention relates to a method of setting the pressure in a chamber of a vacuum system to a required pressure, the system comprising a pressure control system including a pump for evacuating gas from the chamber and a flow controller for allowing the flow of gas into the chamber, the method comprising setting an initial flow into and/or out of the chamber for achieving a pressure above the required pressure so as to increase the rate of pressure increase, the initial flow occurring over a transient period which does not allow the pressure to exceed the required pressure, and setting a preset flow into and/or out of the chamber after the transient period has elapsed for achieving and maintaining the required pressure. Iperiod has elapsed for achieving and maintaining the required pressure.

Abstract: A leak detector for detecting volumetric changes in a liquid volume includes a biased piston disposed in a housing and a liquid passage extending from the liquid volume to an expansible chamber defined by the housing and piston. The leak detector further includes a magnetostrictive sensor including a magnetostrictive waveguide, a magnet operably coupled to the piston and moveable therewith and pulsing and detection devices for detecting the position of the magnet along the magnetostrictive waveguide. A method of using the detector includes exposing the expansible chamber to liquid from the liquid volume and sensing the changes in the liquid volume magnetostrictively by causing relative movement between the waveguide and the magnet to obtain data representative of piston movement which is responsive to volumetric changes in the liquid volume.

Abstract: A graft-modified organic porous material comprising an organic porous material of 1-50 ml/g total pore volume having such an open cell structure that mesopores of 0.01-1000 ?m radius are present within walls between macropores communicating with each other and, provided on the surface of the organic porous material, grafted polymer chains, characterized in that the density of polymer chains is at least 0.1 polymer chain per nm2 of surface of organic porous material. Thus, there are provided a graft-modified organic porous material wherein polymer chains have been introduced at high density in surface portion of organic porous material and a process for producing the same.

Abstract: A measuring apparatus of submergence aggregate according to the present invention comprising a stock bin for storing fine aggregate, a fine aggregate feed hopper placed under the stock bin, a vibrating feeder placed under a discharge opening of the fine aggregate feed hopper, a screen device placed in the vicinity of an exit of the vibrating feeder, a measurement tank placed under the screen device, an electrode-type displacement sensor as means for measuring a water level placed above the measurement tank, and load cells as mass measuring means for measuring a mass of the measurement tank.

Abstract: A fluid monitoring apparatus for monitoring a fluid in a fluid mains supply, the apparatus comprising means for connecting the apparatus to the mains supply, a testing chamber, a fluid tester, testing a variable of a fluid in the testing chamber and a purger for purging a volume of fluid from the testing chamber which volume of fluid is substantially larger than the volume of the testing chamber, thereby replacing the fluid in the testing chamber with a new fluid volume.

Abstract: The preferred embodiments are directed to a method and apparatus of operating a scanning probe microscope (SPM) including oscillating a probe of the SPM at a torsional resonance of the probe, and generally simultaneously measuring an electrical property, e.g., a current, capacitance, impedance, etc., between a probe of the SPM and a sample at a separation controlled by the torsional resonance mode. Preferably, the measuring step is performed while using torsional resonance feedback to maintain a set-point of SPM operation.

Abstract: A system and method allow the position of a motorcycle crankshaft to be sensed without causing oil froth or foam. A flywheel is arranged perpendicularly and concentrically with respect to the crankshaft, and an electronic sensor is positioned for sensing the face of the flywheel, which has a plurality of notches therein. The electronic sensor is equipped to sense passage of the notches past the sensor. The rim of the flywheel is toothless.

Abstract: A sensor assembly is provided with a speed sensor module that is rotatable relative to a bracket between first and second positions. The sensor module need not be translated to accomplish the rotation; therefore, it may remain installed through an aperture of a transmission casing and adjustment between the positions will not involve fluid leakage. The sensor module and the bracket interfit to establish and define both the first and second positions. A method of assembling a sensor module in a transmission includes loosening a bolt holding a bracket to a transmission casing, sliding the bracket relative to the sensor module, and then rotating a sensor module between first and second positions without removing or even translating the module in the casing aperture. Preferably, testing of the sensor module occurs when it is in the first position and the second position is an in-use position.

Abstract: In a device for determining at least one parameter of a medium flowing in a main direction of flow in a line, which device has a part that can be inserted into the line with a predeterminable orientation in relation to the main direction of flow in such a manner that a partial stream of the medium flowing in the line passes into an entry region of a channel structure formed in the part, a measuring channel, provided with a measuring element for determining the at least one parameter, branching off from the entry region and the entry region having a separation zone which is separated from the measuring channel and has at least one separation aperture, which separation aperture opens into the line at a side wall of the part, which side wall extends substantially parallel to the main direction of flow, the part advantageously has at least one wind shield which is disposed downstream of the at least one separation aperture in the direction of the main direction of flow and which projects from the side wall provid

Abstract: An embodiment of the present invention provides a surface sensor system comprising a wet/dry sensor assembly, an electrically isolated passive sensor assembly, a thermally adjustable active sensor assembly, at least one temperature sensor, and a data processing device coupled together as a unit positionable adjacent to a surface, such as an outdoor surface. The unit is configured to determine the presence a surface material containing water or a water-based mixture on the surface and the solid or liquid phase of the surface material.

Abstract: A transmission for torque transfer with axial compliance and a test machine employing the transmission has a flexible connector that provides high torsional stiffness and high axial compliance while inducing no frictional forces. The transmission includes an axial portion allowed to translate freely along its axis due to a high axial compliance of the transmission while the transmission simultaneously facilitates rigid torque transfer.

Abstract: A sliding fluid level-detecting device which is mounted in a fuel tank of a vehicle and detects a remaining amount of a liquid fuel in the tank by sliding, on a plurality of stripes of an electrode formed at an electrode part electrically connecting with a fuel meter, a contact point provided on a slider interlocking with displacement of a float floating on a fluid surface of the liquid fuel, wherein the electrode is formed out of a glass-incorporated silver-palladium alloy where glass is mixed in an amount of 30 to 50 parts by weight per 100 parts by weight of a silver-palladium alloy and the contact point is formed out of a conductive material having a Vickers hardness (Hv) of 190 to 250.

Abstract: A device and a method for damping the imbalance of a rotating part (7) are described, comprising a means (13) for determining at least one parameter of the imbalance during a rotational movement of the part and a means (20) for influencing the axis of rotation (15) of the rotating part (7) in such a manner that the axis of rotation (15) coincides with the axis of inertia (16) of the part (7), wherein at least one parameter is supplied as an input quantity to the means (20) for influencing to bring about a dynamic variation of the axis of rotation (15) with respect to the axis of inertia (16) of the rotating part.

Abstract: A method for measuring movement of a solid, using an absolute measurement associated with a double integration measurement. The method can be applied in particular to sensing movements of the human body and includes a series of measurement of the acceleration of the solid and double integration of the measurements to obtain successive values of a first translation of the solid, and a series of absolute measurements of at least one second degree of freedom of the solid, namely a rotation, and this measurement of rotation is converted into a measurement of translation used to update the first translation.

Abstract: The invention provides a tuning-fork type transducer for an angular-speed sensor which realizes a stable fork-driving, realizes downsizing of the angular-speed sensor, and is capable of executing control of a vehicle body with high degree of accuracy when being used under a high-temperature environment, an angular-speed sensor using this transducer, and an automotive vehicle using this angular-speed sensor. Electric charges obtained from upper electrodes (13a), (14a) provided on an arm (10b) are amplified respectively by current amplifiers (40a), (40b). The amplified signal is differentially amplified by a first differential amplifier (41), and the amplified signal is used as a monitor signal for fork-driving. An added signal obtained by adding output signals from the current amplifiers (40a), (40b) by an adder (60) is used as a signal for detecting the angular speed.

Abstract: An angular velocity sensor is provided, which is capable of accurate failure diagnosis on a detecting portion despite of its simple configuration and small size without providing additional means on an oscillator separately from the driving portion and a detecting portion. When a check signal for carrying out failure diagnosis is input to terminal (54) from outside, the degree of amplification at amplifier (45) is decreased, and the degree of amplification at amplifier (44) is simultaneously increased by an operation of AGC circuit (43). As a result, a driving signal having the decreased amplitude can be obtained at terminals (50) and (53), and a driving signal having the increased amplitude can be obtained at terminals (51) and (52). The driving signals are supplied to one driving electrode and another driving electrode, respectively, of a pair of driving electrodes spaced from each other across the center of the arm of a tuning fork type oscillator through terminals (50) to (53).

Abstract: Structures and methods for frequency shifting rotational harmonics in MEMS devices are disclosed. An illustrative MEMS device can include a substrate, a sense electrode coupled to the substrate, and a proof mass adjacent to the sense electrode. A number of non-uniformly dispersed holes or openings on the proof mass can be configured to alter the distribution of mass within the proof mass. During operation, the presence of the holes or openings alters the frequency at which the proof mass rotates about a centerline in a rotational mode, reducing the introduction of harmonics into the drive and sense systems.

Abstract: A sensor comprises two identical vibrating members operating with a common working frequency and joined to each other by a mechanical decoupling device. The device comprises a frame and two connecting bridges each supporting one member. The frame comprises a succession of mass portions and thinned portions so that the frequency of one mode of structural resonance of the frame is substantially equal to the common working frequency, and each connecting bridge is disposed in a node of vibration of the frame at the common working frequency. Thus, the vibrations of the two vibrating members are decoupled from each other.

Abstract: A method and a device for detecting discontinuities in a material region having at least one probe which has a plurality of ultrasonic transducer elements and having an evaluation and control device are proposed, in which the transducer elements are disposed diagonally at an angle to the surface of the material region and are actuated via delay elements in such a manner that a defocusing sound field is beamed in. The received signals of the transducer elements are supplied to a plurality of evaluation modules for parallel and simultaneous further processing for different angle values or angle ranges, the number of evaluation modules corresponding to the different angle values or ranges.

Abstract: An ultrasonic generator comprising an input module for receiving a power signal. An output module for outputting an ultrasonic signal is also included in the generator. A motherboard is coupled to both the input module and the output module. The motherboard includes a digital controller adapted to control the input module and the output module.

Abstract: An ultrasound sensor has an ultrasound oscillator which is expandable and contractible in a thickness direction thereof, and a casing which houses therein the ultrasound oscillator. An outer surface of an end portion of the casing is fixed to a mounting member. The side surface of the ultrasound oscillator has at least one of a protrusion portion, a concave portion and an inclined portion, through which one of two end surfaces of the ultrasound oscillator fixedly contacts an inner surface of the end portion of the casing. The side surface of the ultrasound oscillator is substantially parallel with the thickness direction thereof.

Abstract: A system provides an in situ or non-invasive vibro-acosutic (VA) analysis of an arbitrary complex vibrating structure. The major advantages of this system are that: (1) it allows for an identification of the VA modes that are directly responsible for structural vibration and sound radiation; (2) it enables one to acquire a quantitative description of contributions from individual VA modes that are responsible for resultant structural vibration and sound radiation; and (3) it is non-invasive so that one can conduct an in situ analysis of a machine running under its natural working condition. With this information, one can tackle noise and vibration problems in the most cost-effective manner.

Abstract: A method of detecting defects in a railway track rail, the rail (101) having a longitudinal centre plane and a surface, the surface including a running surface (102), the method comprising directing an excitation laser beam (106) to an excitation position (103) on the surface of the rail (101) to induce an ultrasonic wave in the rail (101); and directing a detection laser beam (108) to a detection position (104) on the surface of the rail (101) to detect at least one predetermined property of the induced ultrasonic wave; wherein the excitation position (103) and the detection position (104) are located on the running surface (102) and displaced from the longitudinal centre plane of the rail (101).

Abstract: The novel embodiments include a method, system and device for measuring a fluid characteristic in a conduit. The novel method includes applying a planar force to the conduit and receiving a pressure from the conduit. The pressure is responsive to the fluid and the conduit, where the pressure is received within a predetermined area. Also, the novel method includes processing the pressure to determine the fluid characteristic. The novel device includes a support structure for supporting the conduit and a sensor head in cooperation with the support structure. The sensor head applies a planar force to the conduit, and has a portion least equal to an outer radius of the conduit. The device also includes a pressure transducer located on the sensor head. The pressure transducer receives a pressure from the conduit that is responsive to the fluid and the conduit.

Abstract: A relative pressure measuring transmitter resistant to the intrusion of moisture. includes a housing, an insert arranged in the housing, a gap existing between the housing and the insert, a relative pressure sensor, and, connected to the relative pressure sensor, a reference pressure supply line, which leads into the insert, opens on an outer wall of the insert, and has an interior, which is connected via an opening in insert with the gap The housing has a bore passing through it, via which the gap is placed in communication with an environment of the relative pressure measuring transmitter.

Abstract: A preformed senior housing including a conduit having an inside; a plug disposed within the conduit, and a deposit covering a portion of the plug and a portion of the conduit. A method is also disclosed for creating a thin film diaphragm on a housing including the step of inserting a sacrificial element into the housing; depositing a diaphragm material onto the sacrificial element and the housing; and removing the sacrificial element.

Abstract: The invention relates to a differential pressure means and a gas meter arrangement for precisely measuring a gas consumption by means of a gas meter. A previously known gas meter is disposed in a bypass comprising a differential pressure means in the gas pipe for measuring a volumetric flow rate inside the gas pipe. According to the invention, the differential pressure means comprises flow ducts having decreasing diameters as the radial position increases starting from a central axis of the differential pressure means. Examples of execution include inlet ports and/or outlet ports of the flow ducts which are provided with a specific countersink angle (?), and an equidistant, concentric arrangement of flow ducts on the cross-sectional area of the differential pressure means.

Abstract: An object of the present invention is to provide an electric screwdriver device having a function for determining that a correct tightening operation has been carried out when the tightening operation has taken a time longer than a reference time predetermined for the tightening operation, characterized in comprising a novel means for determining the reference time.

Abstract: Manufacturers test printed circuit boards (PCB) to ensure that all components have been soldered to the correctly. Some tests cause the boards to deflect, which can damage component-to-board interfaces (i.e., solder joints) or components. Embodiments of the present invention measure the amount of PCB deflection before, during, and after the PCB is subject to mechanical load using photoelectric amplifiers, which send and receive light beams to targets mounted on the PCB surface through optical fibers and lenses mounted in a head assembly. The intensity of received light beams are proportional to analog voltages output by the photoelectric amplifiers and to the distance between the head assemblies and the targets. A data acquisition system converts the analog voltages to digital voltages and a software interface correlates the digital voltages to PCB deflection/displacement. A GUI displays deflection before, during, and after the PCB is subject to mechanical load.

Abstract: The invention relates to a magnetic inductive flowmeter comprising: a measuring distance that is surrounded by a wall; a magnetic field generating device, and; an electrode device, which has at least one electrode on the inside of the wall and an electrode connection on the outside of the wall. The aim of the invention is to simplify the assembly of the inventive flowmeter. To this end, the electrode connection is connected to the electrode by means of a plug-type connection, and the electrode connection fixes the electrode to the wall.

Abstract: A magnetic-inductive flow meter with a measuring tube (1) made of metal, which is flowed through by a medium (4) which has a minimum electrical conductivity and is permeated by a magnetic field generated by means of an arrangement of magnets (5), in the region of which field at least two measuring electrodes (6) arranged diametrically on the measuring tube (1) are provided for sensing the inductively generated measuring voltage, the metal measuring tube (1) being provided with an electrically insulating inner layer (7) and an electrically conductive grounding disk (8) being arranged at the end face for grounding the medium flowing through the measuring tube (1), which disk is connected to ground via the measuring tube, the grounding disk (8?) consisting of an electrically conductive plastic which comes to lie in sealing contact directly against the end face (2) of the measuring tube (1) in order to be connected to ground by the direct contact.

Abstract: A reduced bore vortex flowmeter and flowmeter body includes a fluid inlet couplable in series to an upstream portion of a fluid flow conduit. The inlet fairs into a central bore having a transverse cross-sectional dimension less than that of the conduit, and which houses a shedder. The central bore is communicably coupled to a fluid outlet couplable to a downstream portion of the conduit. The inlet has a stepped or structured inner wall, including a first wall portion disposed at first angle to the downstream direction, and a second wall portion disposed at a second angle to the downstream direction. The second angle is greater than the first angle, so that the first and second wall portions form a substantially concave axial cross-section. The stepped intake improves linearity of flow measurements by reducing velocity profile errors and/or extending contracted flow to the shedder over a relatively wide flow range.

Abstract: A process pressure fluid transmitter is coupled to a differential pressure producer and measures a differential pressure across the producer. A statistical parameter is calculated upon successive differential pressure indications, and the calculated parameter is used to indicate wet gas flow. The indication can be generated locally at the process pressure transmitter, communicated via a wired process communication loop, communicated wirelessly, or any combination thereof.

Abstract: A first inlet portion 4, a second inlet portion 6, a first outlet portion 5, and a second outlet portion 7 are fixed to a fixing member 8, and a connecting tube portion 9 is provided between the first outlet portion 5 and the second inlet portion 6. Further, the first inlet portion 4 and the second inlet portion 6 are arranged in a non-parallel state such that the distance between the two increases as they depart from the fixing member 8, and the first outlet portion 5 and the second outlet portion 7 are similarly arranged in a non-parallel state, the first inlet portion 4 and the second inlet portion 6 and the first outlet portion 5 and the second outlet portion 7 being arranged symmetrically. Further, the first outlet portion 5, the second inlet portion 6, and the connecting tube portion 9 are arranged such that their three tube axes are in a straight line.

Abstract: A sensor having a crystal having a first face and a second face, the first face comprising a prong, wherein the sensor is adapted to track movement of an object in a medium other than vacuum and the prong has a frequency of vibration that substantially matched a frequency of vibration of the crystal is disclosed. A method to track movement of an object a method of manufacturing a system to track movement of the object is also disclosed. The method of tracking includes creating a sensor adapted to track movement of the object in medium other than vacuum and providing a spatial tracking map. The method of manufacturing the system to track movement of the object includes fabricating a plurality if sensors, arranging the plurality of sensors in a three-dimensional space and feeding data from the plurality of sensors into a mapping algorithm.

Abstract: A sensing device for sensing activity on or around an object, includes sensor cords provided in a parallel or a substantially parallel arrangement. Each sensor cord includes sensors disposed adjacent one another. Each sensor includes a resilient top portion having at least one resilient conductive member, and a resilient lower portion having active sections and resilient lower portion conductive members channeled and interconnected through the lower portion, the lower portion conductive members being separated by non-conductive material. Each active section further includes a layer of resilient conductive material at a top of the lower portion, resilient non-conductive material arranged over the lower conductive members to insulate the lower portion conductive members from the conductive layer, and a communicating conductive material to connect one of the conductive members to the resilient conducting material on top of the active section.

Abstract: Provided are a device and a method for pre-treating and injecting a liquid specimen.

Abstract: A magnetic sensor array includes a first three-dimensional magnetic sensor secured to a substrate in a central location of the substrate. A number of second three-dimensional magnetic sensors are secured to the substrate at a first distance from the first magnetic sensor. Additionally, a number of one-dimensional magnetic sensors are secured to the substrate at a second distance from the first magnetic sensor greater than the first distance. Additional magnetic sensors of any dimension may also be included. The magnetic field sensitivity of the first and second three-dimensional magnetic sensors may be less than the magnetic field sensitivity of the one-dimensional magnetic sensors. The sensing range of the first and second three-dimensional magnetic sensors may be greater than the sensing range of the one-dimensional magnetic sensors. The magnetic sensor array may also include a processing circuit coupled to the magnetic sensors.

Abstract: The present invention provides a defect detecting/degree-of-filling-in measuring apparatus for concrete during placement that meets the tolerance for butting angle for the electrode with respect to the concrete form, and that is capable of carrying out measurement with the measurement depth being changed.

Abstract: A booster actuator 10 may be positioned between the solenoid 12 and a valve 14, and increases the energy output from the solenoid to activate the valve. The booster actuator 10 may include a force input member 28 and a force output member 30 each linearly movable with respect to a body 20 from an initial position to an activated position. A coil spring 46 biases the input member to the initial input position, while a plurality of disk springs 48 bias the output member 30 to the activated output position. A plurality of linking members 32 each pivotable with respect to the body normally retain the force output member in the initial position, but upon movement of the input member to the activated position release the force output member in response to the disk springs.

Abstract: The invention relates to a wobble drive, in which a shaft supports a wobble ring by means of a pivot bearing, a finger extending from said ring. To reduce vibrations caused by the movement of the finger, at least one balancing mass is configured on the shaft. Alternatively or in addition, at least one balancing mass can be provided on the wobble ring. This allows the vibrations that are caused naturally by the movement of the finger to be compensated.

Abstract: To drive an extruder (1) which has several axially parallel shafts (3) rotating in the same direction, with conveyor elements (4), arranged around a circle at equal angles with respect to each other, the shafts (3) are attached to the driven shafts (11) of a gear system, wherein each driven shaft (11) has a pinion (19, 20) and each driven pinion (19, 20) engages both with an externally-toothed drive wheel (21, 22) and with an internally-toothed hollow gear wheel (24, 25), and the externally-toothed drive wheel (21, 22) and the internally-toothed hollow gear wheel (24, 25) are driven with the same torque.

Abstract: The invention relates to a gearbox comprising a shift fork (4) that is displaced by an actuator using a shaft (2), whereby a rotational displacement of said shaft is translated into a displacement of the shift fork. To achieve an accurate displacement with minimum installation space, the gate (14) is configured on a sleeve (13) that is connected to the shift fork unit (4) in a rotationally fixed manner, said sleeve acting on the shift fork unit (4) in the direction of the displacement by means of a spring (24) and the shaft (2) runs through the sleeve (13), said shaft comprising a finger (11) that protrudes radially an co-operates with the gate. The shift fork unit (4) forms a housing (8) that surrounds the sleeve (13) and the springs accumulator (24) and that comprises bearing surfaces (34), by means of which the shift fork unit (4) is guided on the shaft (2) in the direction of the displacement.