48 results about "Lateral deflection" patented technology

A method for testing and evaluating lateral stiffness of small box girder bridges is provided. The method includes the following steps: a deflection sensor collects a deflection value of a measuring point based on a loading process of a loading vehicle; based on the deflection value of the measuring point and an information matrix of the loading vehicle, an influence line of longitudinal bridge deflection of each measuring point is obtained; based on the influence line of longitudinal bridge deflection, the influence line of lateral bridge deflection of small box girder bridge is obtained by interpolation method; and based on the influence line of lateral deflection of small box girder bridge, a stiffness evaluation result is obtained.

The utility model discloses sidewise bending detection equipment for a cantilever crane, and relates to the field of engineering machinery. The equipment comprises a shell, a power supply module, a wireless module, a sidewise bending measurement module and a circuit board, the power supply module, the wireless module, the sidewise bending measurement module and the circuit board are all arranged in the shell; the power supply module, the wireless module and the sidewise bending measurement module are electrically connected with the circuit board respectively and are used for accurately detecting sidewise bending of the boom, so that the safety of the crane in the operation process is improved.

A three-axis angular rate sensor with a substrate and a A double rotor is proposed, wherein the double rotor has a first and a second rotor (1, 2) which are elastically connected to one another via a first coupling element (8) in such a way that the two rotors (1, 2) can be excited to antiphase torsional vibrations, wherein the first rotor (1) has a first and a second second seismic mass (3, 4) which are mounted so as to be deflectable relative to the first rotor (1) and the second rotor (2) has a third and a fourth seismic mass (5, 6) which are mounted so as to be deflectable relative to the second rotor (2), wherein the first mass (3) is connected to the third mass (5) via a first rocker element (9) is connected in such a way that the third mass (5) at a lateral deflection of the first mass (3) is deflected in an opposite lateral direction, wherein the second mass (4) is connected to the fourth mass (6) via a second rocker element (9') such that the fourth mass (6) is deflected in an opposite lateral direction upon a lateral deflection of the second mass (4).

A support plate and reinforcement member may be mounted within a hollow side sill between a rocker and crossmembers for a vehicle framework. The support plate may include flanges along either edge and a straight, projecting face between the flanges. The reinforcement member, mounted on the support plate proximate to an outer surface of the side sill, may include flanges along either edge and a wavy projecting face between the flanges. Contact portions of the projecting face for the reinforcement member may contact an interior of the side sill at regions aligned with where the side sill mounts to the crossmembers, with intervening portions of the projecting face, in areas adjacent energy absorbing crush cans, extending less far from the flanges. The intervening portions may also be laterally offset from the contact portions, to provide larger weld areas.

The invention relates to the field of check valves, in particular to a marine external high-pressure stop check valve which comprises a driving mechanism used for operating and controlling plugging and dredging of a medium. The cut-off mechanism is used for blocking and dredging a medium, and the driving mechanism is arranged on the cut-off mechanism; the flow control mechanism is used for carrying out flow control treatment on the introduced cut-off, and the flow control mechanism is arranged in the cut-off mechanism; according to the external high-pressure stop check valve for the ship, the curved surface part of the bottom of the bottom curved handle and the diagonal line of the rhombic disc are collinear, the other parts of the bottom end of the bottom curved handle are all vertical faces, and therefore under the action of the bottom curved handle, the bottom curved handle can be fixed to the rhombic disc, and the bottom curved handle is fixed to the rhombic disc. And the rhombic disc is locked by the bottom curved handle, so that the rhombic disc is prevented from transversely deflecting, and the transition rod stably moves downwards or upwards.

A racquet including a frame including a head portion, a handle portion, and a throat portion. The head portion forms a hoop that defines a string bed plane. The head portion of the racquet being formed of a fiber composite material. When the racquet is tested under the racquet lateral bending test, the racquet has a lateral deflection of at least 6.5 mm when measured in a first direction that is parallel to the string bed plane and perpendicular to the longitudinal axis. When the racquet is tested under a racquet forward / rearward bending test, the racquet has a forward / rearward deflection with respect to the longitudinal axis of less than 7.3 mm when measured in a direction that is perpendicular to the string bed plane and perpendicular to the longitudinal axis.

A three-axis rotation rate sensor. The sensor includes a substrate and a double rotor including a first rotor and a second rotor elastically connected to each other via a first coupling element such that the two rotors are excitable to antiphase rotary oscillations, the first rotor including a first and a second seismic mass, which are deflectably mounted vis-à-vis the first rotor and the second rotor includes a third and a fourth seismic mass, which are deflectably mounted vis-à-vis the second rotor, the first mass being connected to the third mass via a first rocker element such that the third mass is deflected in an opposite lateral direction upon a lateral deflection of the first mass, the second mass being connected to the fourth mass via a second rocker element such that the fourth mass is deflected in an opposite lateral direction upon lateral deflection of the second mass.

The present application relates to a kind of pre-tensioned steel wire rope lateral impact response calculation method considering geometric and friction nonlinear coupling.First, the linear tensile constitutive model of pre-tensioned steel wire rope is constructed, Von Kármán large deflection theory is introduced, and the geometric hardening relationship of the nonlinear growth of axial tension with lateral deflection is established;Subsequently, a bilinear bending stiffness model is constructed to calculate the critical anti-sliding torque that evolves dynamically with tension;Based on the principle of energy conservation and Rayleigh-Ritz method, the system total potential energy functional of axial tensile potential energy and nonlinear bending potential energy is constructed, and the maximum impact deflection and tension response of the steel wire rope are obtained by solving the energy residual equation, the maximum response is substituted back into the constitutive equation, and the maximum nominal stress of the midspan cross section, the maximum axial tension and the extension length of the internal slip zone are calculated.The present application has very high calculation efficiency compared with full-size finite element simulation, and is suitable for the rapid design and safety evaluation of steel wire rope protection system.

A roadway barrier system includes a plurality of compact profile highway barriers preferably which are of a height which does not obstruct the viewing lines of a vehicle drivers on the road and permits them to see, for example, cross-traffic situations, work sites, and pedestrians. The barriers have tapered side walls which help maintain a crash on the roadway. Hooks are used to connect barriers end to end, and the hooks are positioned within a channel groove at the end of each barrier. When connected, the hooks of adjacent barriers are largely within the channel grooves of the two adjacent barriers which enables superior lateral deflection prevention. In addition, when connected a V shape section between the ends of adjacent rigid concrete sections of the plurality of rigid concrete sections extends upward from a base of the adjacent rigid concrete sections at an angle of five degrees or less.

The utility model discloses a winding tool for rapid production of composite tubular products, which comprises a plurality of coaxially arranged winding cylinders, an internal connecting shaft is arranged between every two adjacent winding cylinders, two sides of each winding cylinder are provided with first threaded holes, two sides of each internal connecting shaft are provided with internal connecting discs, and the internal connecting discs are provided with second threaded holes. A second threaded hole is formed in the internal connecting disc, and an external connecting shaft is arranged on the outer side of the two-end winding column body. According to the utility model, the plurality of coaxial winding column bodies are arranged, so that the forming of a plurality of products can be completed by single assembly, the assembly frequency of the tool is effectively reduced, and the production efficiency is improved. And the length of each winding column body is designed to be short, so that demolding operation is facilitated. The supporting rod is additionally arranged in the middle of the tool, bearing is facilitated, lateral deflection deformation of the tool is reduced, and therefore the forming size precision of a product is improved. The supporting rod is connected with the tool through the bearing, so that stable rotation of the tool is ensured, and abrasion of the tool and the supporting rod is avoided.

The present invention discloses a grab bucket lifting system and lifting machinery, the grab bucket lifting system includes a grab bucket device, a main lifting device and an auxiliary lifting device, the lifting connecting piece of the grab bucket device is fixedly arranged at the upper end of the grab bucket body, the opening and closing rope can drive the grab bucket body to switch between an unloading open state and a grabbing closed state, the main lifting rope of the main lifting device is connected to the lifting connecting piece through a main lifting pulley group, and the auxiliary lifting rope of the auxiliary lifting device is connected to the opening and closing rope through the auxiliary lifting pulley group. When the grab bucket body is in the unloading open state, the auxiliary lifting pulley group is located above the main lifting pulley group, and the first releasing length of the opening and closing rope is set to make the lateral spacing between the auxiliary lifting pulley group and the main lifting rope greater than or equal to the maximum offset distance of the main lifting rope under the action of the lateral deflection force, thereby making it possible to avoid the phenomenon of the pulley hook wearing the lifting rope while lifting the lifting weight of the grab bucket body.

The utility model provides a test device for simulating transverse constraint of a stirrup on a longitudinal bar. The test device comprises a cross beam, a vertical stand column, two telescopic transverse supporting long rods with scales and two dial indicator devices. The transverse beam support and the two transverse supporting long rods are arranged to provide support for simulating stirrup constraint for the vertical reinforcing steel bars, and compared with the mode that the reinforcing steel bar beam end is clamped through a clamp and then loaded, the state of the longitudinal reinforcing steel bars in an actual reinforced concrete column during vertical stress can be simulated more accurately; due to the arrangement of the dial indicator, the total transverse deflection at the beginning of buckling can be calculated; when the total transverse deflection limit value exceeds the limit value Dt, l is equal to 0.7 mm, it can be judged that the reinforcing steel bars start to bend even if the sudden deflection increasing point is not observed; and effective data support is provided for judging the compressive buckling of the reinforcing steel bar.

A racquet extending along a longitudinal axis and including a frame including a head portion, a handle portion, and a throat portion. The head portion forms a hoop that defines a string bed plane. At least the head portion and the throat portion of the frame are formed at least in part of a fiber composite material. When the racquet is tested under the racquet lateral bending test, the racquet has a lateral deflection of at least 6.0 mm when measured in a direction that is parallel to the string bed plane and perpendicular to the longitudinal axis. When the racquet is tested under the racquet torsional stability test, the racquet has an angular deflection of less than 5.5 degrees about the longitudinal axis. The head portion has a maximum beam height distance of at least 20 mm.

The invention provides a method and a system for reducing abdominal support interference in a trailing separation trajectory capture wind tunnel test, and the method comprises the steps: S1, obtaining a high-speed flight platform abdominal support which comprises a sweepback meeting a preset requirement, and the cross section of the abdominal support is a rhombic section; a connecting block is arranged between the abdominal support and the high-speed flight platform, and the abdominal support can support the high-speed flight platform without transverse deflection in all test states according to the deflection angle of the connecting block; and S2, carrying out numerical simulation comparative analysis based on an aircraft model in a multi-body back separation trajectory capture wind tunnel test and an abdominal support, and selecting an abdominal support closest to a non-abdominal support interference pressure coefficient curve as an optimal scheme. The trajectory capture test model is matched with the characteristics of the support and the flow field, and the influence on the flow field where the separation load is located is small; the connecting block with the deflection angle can effectively counteract lateral deflection of the abdominal support caused by incoming flow sideslip, so that the tail retreating separation under different sideslip conditions is adapted.

The invention relates to a separating conveyor (1) for a palletizer, the separating conveyor (1) having an upstream inlet side (2) and a downstream outlet side (3) and being designed to convey packaging units in the conveying direction (X) from the inlet side (2) towards the outlet side (3), and having a blade-like distributing element (4) which extends substantially in the conveying direction (X) along the separating conveyor (1) and which, for lateral deflection of the packaging units, has a first axis of movement allowing the blade-like distributing element (4) to be moved substantially perpendicularly to the conveying direction (X), the blade-like distributing element (4) having a second axis of movement in which at least a portion of the blade-like distributing element can be moved substantially along the separating conveyor (1).

The utility model relates to a boxing training device, in particular to a vertical boxing target convenient to adjust a side target, which comprises a target rod and the side target, the lower portion of the target rod is mounted on a base, the upper end of the target rod is provided with a mounting sleeve, a transverse spring arm is transversely arranged on the mounting sleeve, and the side target is mounted on a connecting arm. The connecting arm is mounted at the tail end of the transverse spring arm through a multidirectional connecting piece; the multi-directional connecting piece is of a double-joint structure, a first joint of the multi-directional connecting piece can meet transverse deflection of the connecting arm so as to adjust the orientation of the side target, a second joint of the multi-directional connecting piece can meet longitudinal deflection of the connecting arm so as to adjust the height of the side target, meanwhile, the side target can be located in more orientations by comprehensively adjusting the multi-directional connecting piece, and the whole adjusting process is simple, rapid and convenient. And a user can quickly adjust so as to meet personalized training requirements.

This utility model discloses an anti-kink rigid lifting lug device, belonging to the field of lifting lug technology. It includes a connecting pipe and steel pipes respectively installed at both ends of the connecting pipe. Lifting lugs are installed on both steel pipes, and welding plates are provided on the inner side of each lifting lug. Two mounting holes are provided on the lifting lugs, with a bearing fixedly installed in the upper mounting hole. This utility model allows the outer wall of the welding plate to be flush with the outermost derrick of the vertical shaft. Two upper steel plates of the welding plate are welded to the outer crossbeam of the vertical shaft derrick, and the lower steel plate is welded to the side wall of the outer vertical beam. During welding, care is taken to ensure that the center line of the upper and lower mounting holes of the lifting lugs is parallel to the vertical beam of the vertical shaft derrick. The lifting buckle on the pulley block is installed in the bearing on the lifting lug. Because the lifting lug is welded and fixed to the steel pipe, it provides support on both sides and is in a rigid connection, preventing the vertical shaft derrick from lateral deflection during lifting. This ensures that the upper and lower pulley blocks are subjected to vertical force in the same direction, preventing the lower pulley block from twisting under force.

A feedthrough assembly for a bulkhead for mobile and static engine components. The feedthrough assembly can be configured to include a flexible bellows that allows for movement and sealing of the engine components relative to the bulkhead. In one aspect, a flexible bellows spherical element can be provided in the feedthrough assembly. In another aspect, a flexible bellows bellows element can be provided in the feedthrough assembly. These flexible bellows elements can have a plurality of bellows sections that include bellows sections having different stiffnesses. The bellows sections can be configured to allow for movement of the shaft relative to the bulkhead, including lateral deflection and tilt.

The utility model discloses a spherical holder convenient to operate. The spherical holder comprises a base, a ball head, a locking assembly and a double-shaft rotating assembly. A spherical rotating cavity is formed in the base; the ball head is rotationally arranged in the spherical rotating cavity; the locking assembly is connected between the base and the ball head and used for limiting relative movement between the base and the ball head. The double-shaft rotating assembly is connected between the base and the ball head and is provided with a first rotating shaft X and a second rotating shaft Y, so that the ball head can rotate around the first rotating shaft X and / or the second rotating shaft Y relative to the base; by means of the structure, universal rotation can be completed in the mode that X-axis rotation and Y-axis rotation are matched, meanwhile, lateral deviation after unlocking can be avoided, use convenience is improved, and use requirements are met.

The present invention relates to a heel unit for a downhill ski binding or a combined downhill and cross - country ski binding for a snowboard, comprising: a vertical release function group, a horizontal release function group, and a compression spring assembly acting on the horizontal release function group. The vertical release function group has a tensioning device with a sole retainer and a first spring assembly for holding the ski boot in the downhill position. The horizontal release function group has a base plate that can be positioned on the snowboard and a slider that can be laterally deflected relative to the longitudinal direction of the snowboard against the force of a second spring assembly and is provided with the vertical release function group. The vertical release function group can rotate around an axis on the horizontal release function group, and the axis extends vertically towards the top side of the snowboard or extends at an angle of at most 5° towards the vertical line of the top side of the snowboard, such that after a limited lateral deflection of the slider, the vertical release function group rotates against the force of the second spring assembly to release the ski boot in the corresponding lateral release direction.

This invention discloses a method, system, and medium for real-time prediction of the response of a single pile in spatially variable clay. The method includes: establishing a stochastic finite element model of the pile foundation and characterizing the spatial variability of the undrained shear strength of marine clay to generate a pile response dataset. The pile response data in the dataset includes the pile's lateral deflection, rotation angle, bending moment, and shear force. Four depth operator network models are constructed and trained based on the pile response dataset. The trained depth operator network models are then used to predict the lateral deflection, rotation angle, bending moment, and shear force of the pile in real time. This invention overcomes the bottleneck of low computational efficiency in existing stochastic finite element models, constructs an efficient prediction model, and enables rapid and accurate prediction of the single pile response.

The invention discloses a non-contact measurement method for the lateral deflection of a vehicle frame based on line structured light. A monocular single-line measurement unit is installed according to the matching of a field of view and a width of a frame; the positional relationship between the monocular single-line measurement unit and a global coordinate system is calibrated; by projecting a single-line structured light to the vehicle frame, each monocular single-line measurement unit three-dimensionally reconstructs a surface three-dimensional point cloud of a cross section, and converts it to a global coordinate system; a global point cloud fitting plane is used as an approximate surface of the cross section, all point clouds are projected to the approximate surface of the cross section, a local coordinate system is established on the approximate surface of the cross section, the normal vector direction of the global point cloud is used as the Z-axis direction of the local coordinate system, the X-axis direction is the cross section direction, and all projected point clouds are converted to the local coordinate system; according to the distribution of geometric features of the cross section, straight line segments of the measurement position are segmented; a reference plane is fitted with the point clouds of the first and last straight line segments, the average distances of other straight line segments to the reference plane are calculated, and the maximum positive value and the minimum negative value thereof are taken as the lateral deflection.

The present invention relates to the field of wind tunnel testing, and provides an ejector slot follow-up adjustment mechanism, a flow field control method and system, the mechanism comprising an ejector slot formed by a test section air-permeable wall panel and a test section solid wall panel located on both sides of the flow field, and a rotation center and a scimitar mechanism located in the middle of the flow field; and also comprising a servo motion mechanism, which is respectively connected to the test section solid wall panels on both sides of the flow field, and is used to drive the test section solid wall panels to control the opening of the ejector slot. During the test, the ejector slot opening on both sides of the flow field is adjusted according to the sideslip angle formed by the deflection of the scimitar mechanism. The present invention proposes a driving mechanism that can realize the continuous movement of the sideslip angle of the model, and the movement of the sideslip angle is completely decoupled from the movement of the angle of attack and does not affect each other; by introducing a servo motion mechanism to dynamically adjust the ejector slot opening according to the sideslip angle, the difference in the flow area on both sides of the scimitar mechanism can be minimized as much as possible, thereby reducing the asymmetry of the left and right flow fields, reducing the lateral deviation angle of the airflow, and better reducing the interference of the bracket.

The invention relates to a power system thrust measuring device, belongs to the technical field of power system test equipment, and solves the technical problem that the coaxiality is difficult to guarantee after a power system is installed, so that the power system laterally deflects during ignition, and the measuring device comprises a thrust frame, an adapter frame and a front support assembly. The thrust frame is fixed on a test bed foundation through a fastener and is used for in-situ calibration of a power system before test run and thrust measurement in the test run process. One end of the transfer frame is mounted at the front end of the thrust frame, and the other end of the transfer frame is positioned at the front end of the power system for butt-joint mounting of the power system and the thrust frame. The front supporting assembly is located at the rear end of the power system, fixed to a test bed foundation and used for supporting the power system so that the power system can be coaxial with the measuring system of the thrust frame. The device is used for axial thrust measurement in the ignition test of the liquid power system.

This invention provides a bridge tensioning control method, device, electronic equipment, and storage medium. The method includes: determining whether the current tensioning process is the first tensioning process; if so, performing a first-stage synchronous tensioning operation according to a tensioning method that synchronizes elongation; acquiring the elongation deviation and force deviation between the tensioning jacks at both ends of the steel strand; determining a first target tensioning method based on the elongation deviation and force deviation, and performing a next-stage synchronous tensioning operation based on the first target tensioning method; jumping back to the step of "acquiring the elongation deviation and force deviation between the tensioning jacks at both ends of the steel strand," and continuing with subsequent steps to complete the first tensioning process. This invention can avoid the problem of lateral deflection of the bridge.

The utility model relates to a three-linkage device which is used for installing doors and windows and is characterized in that a window and a boss are arranged at the top of a shell, and a strip-shaped through hole is formed in the front surface; the long adjusting plate is installed on the top of the shell, a left strip-shaped hole, an inclined strip-shaped hole and a right strip-shaped hole are formed in the top of the long adjusting plate, the transverse deflection plate penetrates through the left strip-shaped hole and the top face of the shell through a screw to be installed on the top of the long adjusting plate, and a protruding column protrudes out of the bottom of the transverse deflection plate. The longitudinal deflection plate and the short adjusting plate are sequentially stacked and installed on the inner wall of the shell from inside to outside in the shell, an inclined strip-shaped hole and a protruding nail are arranged on the front face of the short adjusting plate, and the left end of the longitudinal deflection plate penetrates through the inclined strip-shaped hole of the short adjusting plate and the front face of the shell through a rivet to be installed. Two through holes are formed in the right side face of the shell, and one ends of the short and long plate screws penetrate through the two through holes to be connected with the right ends of the short and long adjusting plates through threads. The utility model has the advantages of simple structure, convenience in adjustment, strong bearing capacity, difficulty in structure looseness and long service life.

The present invention relates to the technical field of cable installation, and proposes a roller-type cable bearing frame and an application method thereof, wherein a roller-type cable bearing frame includes a fixed bracket, a bearing bracket, a roller 1, an angle adjustment mechanism and a deflection mechanism, wherein the fixed bracket is fixedly installed on a bridge frame or a tower frame, the bearing bracket is rotatably connected to an end of the fixed bracket away from the bridge frame, the angle adjustment mechanism is arranged on the fixed bracket and an end of the bearing bracket away from the roller 1, the angle adjustment mechanism is used to fix the rotation angle of the bearing bracket on the fixed bracket, the deflection mechanism is rotatably connected to an end of the bearing bracket close to the angle adjustment mechanism, the deflection mechanism includes a roller 2, and the deflection mechanism is used to adjust the lateral deflection angle of the cable when supporting the cable. Through the above technical solution, it is used to solve the problem in the prior art that the bearing-type cable bearing frame is difficult to dynamically support cables that are performing lateral swinging and lateral turning.

The invention relates to the technical field of cable installation, and provides a rolling shaft type cable heavy frame and an application method thereof.The rolling shaft type cable heavy frame comprises a fixing support, a bearing support, a first rolling shaft, an angle adjusting mechanism and a deflection mechanism, the fixing support is fixedly installed on a bridge or a tower, and the bearing support is fixedly installed on the bearing support; the bearing support is rotationally connected to the end, away from the bridge frame, of the fixing support, the angle adjusting mechanism is arranged at the ends, away from the first rolling shaft, of the fixing support and the bearing support, and the angle adjusting mechanism is used for fixing the rotating angle of the bearing support on the fixing support. The deflection mechanism is rotationally connected to the end, close to the angle adjusting mechanism, of the bearing support, the deflection mechanism comprises a second rolling shaft, and the deflection mechanism is used for adjusting the transverse deflection angle of the cable when the cable is supported. The cable heavy frame is used for solving the problem that a bearing type cable heavy frame in the prior art is difficult to dynamically support a cable which swings transversely and turns transversely.

This invention discloses a ground effect vehicle, comprising a fuselage and a bionic wing. The fuselage has a main wing in its midsection. The bionic wing is connected to the bottom of the main wing and is driven to swing around an axis perpendicular to the wing surface. In use, the bionic wing passively swings adaptively with the environment to streamline the wake, reduce induced drag, and suppress lateral deflection, thereby improving the stability of water gliding and low-altitude flight. The bionic wing does not require an independent drive mechanism and complex control logic, greatly simplifying the structure and reducing the failure rate. During cruise, the bionic wing swings naturally with the tail flow field, breaking up concentrated wake vortices into smaller vortices, accelerating vortex dissipation, significantly reducing induced drag and energy consumption. During water takeoff and landing, the bionic wing is immersed in the water and passively swings with the water flow to generate a restoring torque, automatically suppressing directional yaw caused by waves and improving wave resistance stability. It is suitable for long-term unmanned inspection operations on the sea surface.

The invention relates to a three-axis rotational speed sensor comprising a substrate and a dual rotor, which has a first and a second rotor (1, 2) which are elastically connected to each other via a first coupling element (8) such that the two rotors (1, 2) can be excited to generate counter-phase rotational oscillations, the first rotor (1) having a first and a second seismic mass (3, 4) which can be deflected relative to the first rotor (1), and the second rotor (2) having a second coupling element (8) which can be deflected relative to the first rotor (1). The second rotor (2) has a third and a fourth vibration mass (5, 6) which can be deflected relative to the second rotor (2), the first mass (3) being connected to the third mass (5) via a first oscillating bar element (9) in such a way that the third mass (5) is deflected in the opposite direction to the lateral deflection of the first mass (3) when the first mass (3) is deflected laterally, and the second mass (4) being connected to the fourth mass (6) via a second oscillating bar element (9 ') in such a way that the second mass (4) is deflected in the opposite direction to the lateral deflection of the first mass (3) when the first mass (3) is deflected laterally. When the second mass (4) is laterally deflected, the fourth mass (6) is deflected in a direction opposite to the lateral deflection of the second mass (4).