198 results about "Extreme position" patented technology

The present invention discloses a transmission mechanism and a drive mechanism. The transmission mechanism includes a mounting seat, a drive shaft, and a first movable member. The drive shaft can rotate relative to the mounting seat. The first movable member and the drive shaft are synchronously rotated and assembled together, and the drive shaft can drive the first movable member to rotate relative to the mounting seat to two extreme positions and an intermediate position between the two extreme positions. The transmission mechanism also includes a second movable member sleeved outside the drive shaft. The second movable member can rotate relative to the mounting seat to a first position and a second position. An elastic body and a limiting structure are provided between the second movable member and the mounting seat, and the elastic body and the limiting structure cooperate to drive the second movable member to remain in or return to the first position. A transmission structure is provided between the drive shaft and the second movable member. The drive shaft rotates and drives the second movable member to rotate to a second position through the transmission structure. The second position corresponds to an extreme position. The transmission mechanism has the following advantages: a transmission mechanism can drive the two movable members to move to appropriate positions respectively to achieve three gear switching. The structure is simple, compact, and easy to operate.

The present disclosure provides a walking-assist robot, which belongs to the field of human-assist technology. The walking-assist robot includes a back bar, two leg drive assemblies, two first limit assemblies and two second limit members. The leg drive assembly includes an adjusting rod. The back bar includes a middle section and two side sections, and the inner diameter of the side section is smaller than the inner diameter of the middle section. The two adjusting rods are slidably connected to the two side sections, respectively, and there is a gap between the adjusting rod and the inner wall of the middle section. The two first limit assemblies are respectively connected to the ends of the two adjusting rods located in the middle section. The two second limit members are fixed to the middle section, the two first limit assemblies are located between the two second limit members, and the two second limit members are respectively located on the sliding paths of the two first limit assemblies. In this way, when the adjusting rod slides to the outside of the back bar to the extreme position, the two first limit assemblies touch the two second limit members, respectively, so that the adjusting rod cannot be separated from the back bar.

Disclosed in the present invention are a hybrid anti-falling beam device and a use method therefor. The anti-falling beam device comprises: a first connecting member, a second connecting member, a limiting component and an energy dissipation component, wherein the first connecting member is fixedly arranged on one side of a bridge pier; the second connecting member is fixedly arranged at the bottom end of an upper structure of a bridge; and the limiting component and the energy dissipation component are each connected to the first connecting member and the second connecting member by means of a first pin and a second pin, respectively. The limiting component and the energy dissipation component are arranged at suitable positions of the bridge by means of the first connecting member and the second connecting member. Moreover, when encountering small and medium-level earthquakes, the first connecting member and the second connecting member move relative to each other, such that internal components of the energy dissipation component rotate relative to each other to dissipate seismic vibration energy; and when encountering a large-level earthquake, the energy dissipation component moves to an extreme position in the limiting component, and the limiting component provides an extreme bearing capacity, thereby further achieving the function of preventing a beam from falling.

The invention discloses a precise steel pipe welding seam processing device and method, and belongs to the technical field of welding seam polishing. The welding seam processing device comprises a base for fixing a steel pipe, a guide rail extending along a steel pipe welding seam is arranged on the base, a sliding seat is slidably mounted on the guide rail, and a turbine rack concentric with the steel pipe is slidably connected into the sliding seat in an arc shape; a first driving mechanism used for driving the worm to reciprocate is arranged at one end of the worm, a supporting block is fixed to the worm gear rack, a supporting rod is movably connected into the supporting block in a limiting mode, a grinding disc is fixed to the end, close to the steel pipe, of the supporting rod, and the supporting rod moves to the limiting position in the direction close to the steel pipe so that the grinding disc can be attached to the steel pipe; second driving mechanisms are fixed to the ends, away from the steel pipes, of the supporting rods. The sliding seat slides along the guide rail, so that a steel pipe welding seam is polished through reciprocating motion of the grinding disc, and poor stability and cost increase caused by reciprocating rotation of the steel pipe are avoided.

The invention provides an electromagnetic valve. The electromagnetic valve comprises a valve seat, a sliding block and core iron. Wherein the valve seat is provided with two channels and is arranged between the inlet connecting pipe and the outlet connecting pipe. The sliding block is arranged on the valve seat in a sealed mode, and the core iron drives the sliding block to slide to switch blocked channels. The channel includes a first sub-channel and a second sub-channel. When the sliding block is used for blocking the second sub-channels and no leakage exists between the sliding block and the second sub-channels, the minimum distance value needed by the outer edge of the sliding block blocking face and the inner side walls of the second sub-channels is the sliding block outer side sealing width H, the distance between the limiting position of vertical movement of the core iron is the core iron stroke G, the width of the two second sub-channels in the sliding block movement direction is J, and G is larger than or equal to H + J; the distance between the center lines of the two second sub-channels in the moving direction of the sliding block is F, the size of the blocking face in the moving direction of the sliding block is T, and T is smaller than or equal to F + H and larger than or equal to J + 2H. Switching of the fluid channels is achieved through sliding of the sliding block along the surface of the valve seat, large switching pulling force is not needed, and the stroke of the core iron needed for switching of the fluid channels is short.

The invention relates to an automobile body door hinge strength detection device, and relates to the technical field of automobile body door hinge strength detection, the automobile body door hinge strength detection device comprises a detection table, a fixed seat is installed on the detection table, one side of a hinge is installed on the fixed seat, and a lateral pressure applying structure and a vertical pressure applying structure are installed on the detection table. The lateral pressing structure comprises a lateral pressing seat, a rotating piece and a first pressing rod, the pressure measuring seat is installed on the detection table through an adjusting assembly, the position of the pressure measuring seat is adjusted through the adjusting assembly to correspond to the rotating axis of the hinge, the rotating piece is installed on the pressure measuring seat, and the first pressing rod is installed on the rotating piece; the first pressing rod is driven by the rotating piece to rotate to apply lateral pressure to the hinge to perform transverse load measurement and application and longitudinal load measurement and application, and the vertical pressure applying structure is installed on the detection table, is installed corresponding to the rotation limit position of the hinge and is used for applying vertical pressure to the hinge to perform vertical load measurement and application. The method has the effect of further improving the accuracy of the detection structure of the hinge.

A knob type locking buckle comprises a middle shaft sleeve, a clamping groove end piece and a clamp end piece, the clamping groove end piece and the clamp end piece are correspondingly arranged at the two ends of the middle shaft sleeve respectively and inserted into the middle shaft sleeve to be in butt joint with a lock catch, a clamping groove is formed in the end of the clamping groove end piece, a spirally-coiled sliding groove is formed in the circumferential wall of the clamping groove end piece, and a protruding column corresponding to the spirally-coiled sliding groove is arranged on the inner wall of the middle shaft sleeve. When the clamping groove end piece is inserted into the middle shaft sleeve, the protruding column on the inner wall of the middle shaft sleeve is clamped into the sliding groove to limit the limiting position where the clamping groove end piece extends out of the middle shaft sleeve to be exposed out of the clamping groove and retreat from the middle shaft sleeve, and the end, facing the middle shaft sleeve, of the clamp end piece is provided with a clamping end structure clamped into the clamping groove. According to the knob type locking buckle disclosed by the utility model, the clamping groove end piece can be switched between two different states of exposing the clamping groove part and folding and shielding the clamping groove part through the rotary progressive sliding groove and the bulge structure, so that the matched clip end piece is clamped into the clamping groove to realize opening and closing of a jewelry rope chain, and the knob type locking buckle is simple in structure and convenient to use. Fatigue failure is effectively prevented, and connection is stable and reliable. And the product quality and the use experience are improved.

A support device (SD) equips a piece of equipment and comprises: - an arm (BE) having a first end (E1) rotationally coupled to a base (ED) and a second end (E2) adapted to receive an object, and - a first electrical mechanism (M1) adapted to translate relative to the base (ED), along a first direction, a support piece (PS) supporting an intermediate part (PI) of the arm (BE) at least in certain positions of the latter, to rotate the arm (BE) around a second direction, perpendicular to the first direction, between first and second extreme positions. Figure 2

The present invention discloses an exploratory auxiliary docking and welding device, which relates to the technical field of pipeline welding, and includes a pipeline, a receiving workpiece, and a truss. The truss is used to provide the ability of multi-axis movement, including a hoisting mechanism and an action mechanism. The present invention can freely adjust the position in the horizontal position and the vertical position through the cooperation of the hoisting mechanism and the action mechanism, and can adjust the pitch angle and the deflection angle relative to the hoisting mechanism to achieve multi-angle free docking, and can support the inner wall of the pipeline and assist in welding. The truss carries a 3D camera to take multi-position photos of the port of the pipeline to obtain more point cloud information of the pipeline for three-dimensional reconstruction, build a model of the pipeline as accurately as possible, determine the docking position, and transmit the coordinate information of the extreme position of the other end of the pipeline to the truss to complete the docking, and complete the welding of the pipeline and the receiving workpiece through external welding equipment.

This device for detecting the position of a movable piece able to move between a first extreme position, a second extreme position and at least one intermediate position, comprises a fixed antenna and a plurality of radio-frequency identification tags arranged along the path of the movable piece between said extreme and intermediate positions, the device further comprising a mechanical contactor configured to establish an electrical connection between the antenna and a unique combination of at least one radio-frequency identification tag for each position of the movable piece.

A gripping gripper (30), particularly suitable for controlling contamination of a surface (112) by smear, comprises: a gripper body (22); a mechanical interface (18) for its connection to a modular effector (16) of a robotic arm (12); two jaws (24); a transmission mechanism (26) for connecting the jaws (24) to the gripper body (22) and converting commands from the mechanical interface (18) into movements of the jaws (24) between a mutually separating configuration and a mutually approaching configuration; two pads (32, 34) mounted on the jaws (24) by means of support mechanisms (38) configured to allow movement of the pads (32, 34) relative to the jaws (24) along trajectories parallel to each other, independently of the position of the jaws (24);and elastic return means (36) configured to stress each of the pads (32, 34) towards an extreme position on its trajectory, on the same side. Figure for the abbreviation: Figure 7;

The present invention discloses a hammer and a pneumatic down-the-hole hammer with a lifting hammer airtight structure, belonging to the technical field of pneumatic down-the-hole hammers. The present invention includes an impactor and a bit, the bit is slidably connected to the lower end of the impactor, and there is a limiting device for the bit inside the impactor. The bit has two extreme positions of full extension and full retraction. It is characterized in that an air path control device is provided, which disconnects the air supply air path of the impactor when the bit is in the full extension position and connects the air supply air path of the impactor when the bit is in the full retraction position. The present invention solves the special technical problems of the cluster pneumatic down-the-hole hammer when dealing with inclined rocks, half rocks, karst caves and other strata, solves the problem of a large amount of air jet from the non-ringing sub-hammer, prevents the sudden drop of the air pressure of the whole system, and ensures the hitting force of the ringing hammer part on the rock; improves the construction efficiency in special strata, reduces energy consumption waste, and improves safety.

The invention relates to the technical field of automobile accessories, in particular to an automobile door lock unlocking structure, driving equipment and a method, the automobile door lock unlocking structure comprises a base, a switch assembly and a driving mechanism, the driving mechanism comprises a pin shaft, a handle, a torsion spring, a pull wire and a damping assembly, a user pulls the handle through external force, the handle rotates around the pin shaft, the torsion spring is compressed, and energy is stored; meanwhile, the pull wire generates pulling force due to rotation of the handle, rotation motion is converted into linear motion, driving force is transmitted to the switch assembly, the damping assembly controls the motion speed of the handle through the damping effect, and when the handle rotates to the limiting position, the switch assembly is triggered to achieve unlocking action. After a user releases the handle, the torsion spring releases compression energy to drive the handle to reversely rotate around the pin shaft to reset. The damping assembly intervenes again, and the reset speed of the handle is delayed through damping force. Therefore, the problems that an existing vehicle door handle is long in operation stroke and large in springback impact, and consequently parts are prone to damage are solved.

The present invention relates to the technical field of anastomosis devices, and in particular to a swinging mechanism for anastomosis devices and an anastomosis device thereof, the swinging mechanism comprising an actuator seat, an extension tube, a push rod and a swinging seat; the rear end of the swinging seat has a left groove and a right groove, the front end end of the left push rod has a left hook, and the front end end of the right push rod has a right hook; the present invention utilizes the left hook and the right hook to cooperate with the left groove and the right groove respectively, on the one hand, so that during the swinging of the actuator seat from the center position to the left extreme position or the right extreme position, only a single push rod applies force to the actuator seat, so as to prevent the extension tube from being bent and deformed due to excessive force on the actuator seat at the left extreme position and the right extreme position, thereby improving the operation accuracy during surgery; on the other hand, the two push rods always keep in contact with the swinging seat, so that the actuator seat will be constrained by the two push rods during the swinging process between the left extreme position and the right extreme position, thereby ensuring the stability of the actuator seat during the rotation process.

The invention relates to a magnetic actuator (1) comprising: - a magnetic core (2), - a pilot coil (4), and - a housing (5), configured to form with at least the magnetic core (2) at least one magnetic circuit (6). This magnetic actuator (1) is particular in that the housing (5) has a movable section (7) that can be placed: - either in a closed position, in which the magnetic flux generated by the pilot coil (4) can be used to control the position of the magnetic core (2), - or in an open position, in which the magnetic core (2) is attracted and held in one of its extreme positions. The invention also relates to a method for disengaging a magnetic actuator (1) according to the invention, and an electrical disconnect device (12) incorporating a magnetic actuator (1) according to the invention. Figure for the abstract: Fig 5

The invention relates to a brewing device (10) for a beverage maker, comprising a plurality of process stations (30, 40, 50) each at a different location, and a volume-variable transfer container (20) which can be moved into an upper and a lower extreme position and which can be moved relative to the process station (30, 40, 50), wherein the transfer container (20) can be filled with an extraction powder (34) at a first and / or a second process station (30, 40), can be filled with a fluid at the first and / or the second process station (30, 40), and wherein an ejection device (52) for removing the used extraction powder (34) is arranged at the second and / or a third process station (40, 50). The invention further relates to a beverage maker having such a brewing device (10).

The invention discloses a low-cost insert structure capable of improving bushing tolerance and a mold. The insert structure comprises a positioning column body, and the top of the positioning column body is provided with a limiting hole; the movable insert is movably assembled with the limiting hole, the movable insert has elastic potential energy in the direction deviating from the depth direction of the limiting hole, and the upper part of the movable insert is exposed out of the limiting hole; the movable insert is sequentially provided with an upper cylindrical section, a circular truncated cone section and a lower cylindrical section in the depth direction of the limiting hole, the outer diameter of the upper cylindrical section is smaller than that of the lower cylindrical section, and the outer diameter of the circular truncated cone section is gradually increased; the outer wall of the junction of the circular truncated cone section and the upper cylindrical section is transited through an inner fillet; the shaft end edge, deviating from the circular truncated cone section, of the upper cylindrical section is provided with an outer fillet; when the movable insert is located at the limiting position away from the bottom face of the limiting hole, the junction of the circular truncated cone section and the lower cylindrical section is flush with the opening edge of the limiting hole. The tolerance of the bushing is compensated by adopting the conical surface of the movable insert in a floating manner, so that the dimensional accuracy of the bushing is reduced, the placement difficulty of the bushing is reduced, and the cost of the bushing is also reduced.

The application discloses a linear position calibration method of a remote controller panel, which is used for calibrating the calibration positions of analog handles and knobs of the remote controller panel, and comprises the following steps: collecting the AD value of the handle in the middle position in the initial state, and locking the calibration position of the handle in the middle position; collecting the maximum value and the minimum value of the handle in the limit position, and locking the limit position of the handle; revising the AD value of the calibration position, the maximum value and the minimum value of the limit position; calculating the output value of the handle in the middle position and the limit position; collecting the small end interval and the large end interval of the knob, and obtaining the extreme position and the middle linear interval of the knob; revising the limit AD value of the knob in the extreme position; and calculating the output value of the knob in the extreme position. Each handle and knob only needs to be manually operated once to realize calibration, so as to calibrate the middle position and the limit position of the handle and the extreme position of the knob respectively, thereby guaranteeing the stable and accurate data in the limit position and the middle position, and realizing self-calibration of the handle and the knob.

The present application relates to the technical field of pipe bending equipment and provides a pipe bending machine for basketball stand processing, comprising a frame assembly and a press-bending assembly; the press-bending assembly comprises a central mold, a first arc-shaped half mold, a second arc-shaped half mold, and a drive mechanism, the drive mechanism being used to drive the first arc-shaped half mold, the second arc-shaped half mold, and the central mold to approach each other until they are in contact with each other; wherein, the central mold comprises a circular base, a plurality of movable inserts slidingly arranged on the surface of the circular base, and a pushing mechanism for forcing each movable insert to move outward; the upper edge of the circular base is provided with a first concave arc, and the lower edge of each movable insert is provided with a second concave arc. In the press-bending operation state, each movable insert moves outward to an extreme position; the circular base is also provided with a reset mechanism for forcing each movable insert to move inward and gather together. Based on this, the pipe can be easily removed after being press-bent, improving the convenience of the material removal operation.

The utility model discloses an anti-siphon anti-backflow pressure reducing valve, which belongs to the technical field of pressure reducing valves and comprises a valve body, a water inlet channel shell, a movable seat and a valve core component, the water inlet channel shell is mounted at a water inlet of the valve body, one end of the water inlet channel shell is positioned inside the valve body, the other end of the water inlet channel shell is positioned outside the valve body, and the movable seat comprises a connecting part and a limiting part. The connecting part is movably connected to the outer side of the water inlet channel shell in a sleeving mode, the connecting part is sleeved with a pressure reducing spring, the end, away from the water inlet channel shell, of the movable seat is connected with a valve element assembly, the valve element assembly comprises a one-way valve rod, a spring and a first sealing ring, and the end of the one-way valve rod is connected to a water outlet of the water inlet channel shell; the one-way valve rod is sleeved with the spring. The one-way valve assembly is arranged in the pressure reducing valve, backflow and siphoning can be prevented, water source pollution caused by backflow is avoided, the stroke of the movable seat of the pressure reducing valve is limited, the movable seat is prevented from moving to an extreme position, and normal passing of water flow is guaranteed.

This invention discloses an electronically controlled shock absorber with a hydraulic buffer structure, a vehicle chassis, and a vehicle, relating to the field of automotive chassis technology. It includes a shock absorber cylinder assembly comprising a working cylinder, an intermediate cylinder, and a shock absorber body. The working cylinder, intermediate cylinder, and shock absorber body are all cylindrical and arranged sequentially from the inside out. A first cavity is formed within the working cylinder, and a piston rod and a hydraulic buffer mechanism are disposed within the first cavity. The hydraulic buffer mechanism includes a hydraulic buffer sleeve and a hydraulic buffer piston assembly. The hydraulic buffer sleeve is located at the top of the first cavity, and the hydraulic buffer piston assembly is sleeved on the piston rod and can slide freely up and down. The hydraulic buffer piston assembly engages with the hydraulic buffer sleeve at its extreme position. Upon impact, the hydraulic buffer piston assembly slides upward along the piston rod and enters the hydraulic buffer sleeve at its extreme position to generate a nonlinear damping effect, thereby increasing the damping force and preventing impact noise.

The utility model relates to a rotary driving type sampling clamp which comprises a clamp part and a sampling frame, and the sampling frame comprises a threaded rod. The rotary pushing part comprises a pushing piece and a rotating piece; the pushing part and the rotating part are arranged on the threaded rod in a sleeving manner, the rotating part is provided with an internal thread which is matched with the threaded rod so as to perform sliding limiting on the pushing part on the threaded rod and limit the size of an opening of the pincer part driven by the pushing part, and the inner wall of the pushing part is in contact with the outer side of the threaded rod of the sampling frame so that the pushing part can slide on the threaded rod; the rotating piece is attracted with the pushing piece, and a connecting part in the middle of the pushing piece is located in the first groove of the sampling frame, so that the first groove can limit the extreme position of the pushing piece in the length direction of the sampling frame. According to the rotary driving type sampling forceps, the contact area between the forceps part of the sampling forceps and the sampling position of a patient can be conveniently controlled, and large trauma caused by sampling of the patient is avoided.

The invention discloses a high-precision position detection method for a protection bearing of a magnetic suspension system. The method comprises the following steps: connecting an inductance test system containing an excitation source with a magnetic bearing coil through a four-wire method; establishing a communication link between the inductance test system and an upper computer data processing system; applying a low-frequency alternating current signal to the magnetic bearing coil; adjusting the position of the rotor to enable the rotor to be in a limit position for protecting a bearing; measuring the inductance value of the magnetic bearing coil at the limit position; substituting the actually measured inductance value into the position deviation detection model to calculate the deviation value of the mounting position of the protective bearing; the deviation value obtained through calculation is compared with an allowable deviation range, and if the deviation value exceeds the range, an alarm signal is sent out; and if the deviation value is within the range, determining that the mounting position is normal. According to the invention, the high-precision and high-reliability detection of the installation position of the protection bearing is realized, an external closed-loop control system is not needed, and the detection of the installation position of the protection bearing of a magnetic suspension system on a production line can be realized.

The present invention discloses a hydraulic system and its stroke limiting and protection device, the hydraulic system includes a system hydraulic source, an executing hydraulic cylinder, the executing hydraulic cylinder includes a first hydraulic chamber, a second hydraulic chamber, and a hydraulic cylinder piston rod, the executing hydraulic cylinder is used to connect a rotary actuator, the stroke limiting and protection device includes: an extreme position limiting device, the extreme position limiting device includes a stroke limiting valve and a stop check valve, the stroke limiting valve is used to open when the hydraulic cylinder piston rod reaches the extreme position, so that the first hydraulic chamber and the second hydraulic chamber are connected; a speed limiting device, the speed limiting device includes a proximity switch and a stroke limiting signaling valve; a zeroing device, the zeroing device includes a centering valve, a centering function isolation valve, and a centering signal valve. The hydraulic system and stroke limiting and protection device of the present invention can achieve stroke limiting and protection for the executing hydraulic cylinder, as well as necessary automatic control, to meet the diverse needs of the execution end.

The utility model provides an electromagnetic valve, which comprises a main valve body component, a main valve body component, a main valve body component, an electromagnetic valve component and a control component, and the main valve body component comprises a valve cavity and a main valve port which are communicated with each other, and the main valve port is arranged at one end of the valve cavity; the piston component is movably arranged in the valve cavity, the piston component is provided with a first end and a second end which are oppositely arranged in the moving direction, and the first end of the piston component is used for blocking or separating from the main valve port; the first buffer part is arranged on the main valve body part, and the first buffer part is arranged close to the second end of the piston part; after the first end of the piston component is separated from the main valve port, the piston component moves to the second end to abut against the first buffering part so as to buffer movement of the piston component. According to the scheme, the problem that in the prior art, when the piston component moves to the limiting position away from the main valve port, the end, away from the main valve port, of the piston component collides with the valve body component, and noise and vibration are generated can be solved.

The utility model discloses a louver roller, including roller, drive arrangement, a plurality of curtain piece, lift pull rope, light control pull rope, light control axle and light control support, lift pull rope one end is fixed on the roller, and the other end is fixed after passing a plurality of curtain piece in proper order with the lowest curtain piece, drive arrangement drives the rotation of roller, light control axle and light control support are set on the roller, light control pull rope both ends are connected with the both sides of a plurality of curtain piece in proper order and form the ladder band, and both ends are connected with light control axle, the roller drives light control axle rotation, when light control axle rotates to the extreme position, light control support prevents light control axle rotation. The utility model discloses when the curtain piece lifting can carry out light control simultaneously, sets up light control support to limit the extreme rotation position of light control axle, prevents the friction between light control pull rope and light control axle, prevents excessive rotation simultaneously and causes light control pull rope or curtain piece damage, has promoted product life.

A robot beam arm applied to abutment corner construction comprises a first sliding unit and a second sliding unit, the two sliding units comprise two bearing platforms moving along two sliding rails respectively, and clamping jaws are fixed to the two bearing platforms respectively; each clamping jaw comprises a supporting frame and a fixing frame which are hinged to each other, so that one end of each supporting frame and one end of each fixing frame can be close to or away from each other, the supporting frames and the fixing frames of the clamping jaws surround to form connecting areas or are opened to form openings, and when the two bearing platforms are close to each other to limit positions, the projection ranges of the connecting areas of the two clamping jaws are overlapped. The sliding rails which are rotationally connected are adopted, so that the motion path can adapt to the corner of the abutment, through the clamping jaws on the two bearing platforms, a working part clamped in the process that the two bearing platforms are close to each other can be connected with the two bearing platforms, and therefore the construction motion path is rapidly changed, and construction is conducted on the corner of the abutment.

A return member for a balance wheel of a timepiece, replacing a spiral spring. This return member includes a rake provided with a toothed sector arranged to work together with a balance wheel pinion. The rake has an axis of rotation allowing it to move between two extreme positions, called working positions, separated by a rest position. The return member also has two springs arranged to press the rake towards its rest position. Each spring is made up of an elastic blade arranged to store energy, then to return it to the rake. Each elastic blade works alternately so that they never work simultaneously. The return member may be in an escapement, a clockwork movement or a timepiece comprising such a movement.

The utility model discloses an automobile longitudinal beam cutting operation platform which comprises a workbench, the top of the workbench is fixedly connected with cutting equipment, pressing plates are arranged on the front side and the rear side of the top of the workbench, lifting rods are fixedly connected to the two sides of the bottoms of the pressing plates, and the bottoms of the lifting rods penetrate to the bottom of the workbench. The bottom of the lifting rod is fixedly connected with a lifting plate, and the top of the lifting plate is fixedly connected with a control mechanism. The motor drives the control wheel to rotate by 180 degrees, the control wheel loses downward pressure on the push rod after rotating, the lifting plate is driven to move upwards through cooperation of the tension spring, the lifting plate drives the push rod and the lifting rod to move upwards, the lifting rod drives the pressing plate to move upwards, and after the pressing plate moves upwards to the limit position, the pressing plate is opened. When the pressing plate is pressed downwards, the control wheel is rotated again, and the operation platform fixing device can achieve rapid positioning and has an efficient positioning mechanism.