60 results about "Backward walking" patented technology

The invention relates to an unmanned aerial vehicle for express parcels, belonging to the technical field of unmanned aerial vehicle application. Parcels to be expressed are firstly loaded in a cargo hold A and a cargo hold B, respectively, and a cargo hold exit door A and a cargo hold exit door B are closed at the same time. A signal received by a wireless antenna is input into a navigation radar and a computer control center, a lithium ion battery A supplies power to drive a motor A, a transmission shaft A and a rotating wing A to rotate to generate flying power, a lithium ion battery B supplies power to drive a motor B, a transmission shaft B and a rotating wing B to rotate to generate flying power, the navigation radar and the computer control center control the rotation of the motor A and the rotating wing A and the rotation of the motor B and the rotating wing B, and the unmanned aerial vehicle flies to a destination according to a flight line set by the navigation radar and the computer control center control after the flight direction is regulated and controlled by a tail vane. A cargo hold door A is opened to take out the express parcels in the cargo hold A and a cargo hold door B is opened to take out the express parcels in the cargo hold B after forward walking wheels and backward walking wheels at the bottom part of the unmanned aerial vehicle land at the destination.

The invention relates to a mobile robot, and particularly relates to a four-connecting-rod mass-center-adjustable patrol robot mechanism. The patrol robot mechanism comprises forward and backward walking and clamping mechanisms, forward and backward pitching mechanisms, forward and backward lifting mechanisms, forward and backward swing mechanisms, forward and backward four-connecting-rod mechanisms, a mass center adjusting mechanism and an electrical cabinet. One end of the forward walking and clamping mechanism and one end of the backward walking and clamping mechanism clamp a wire and the mechanisms walk on the wire, and the other ends thereof are connected with the forward pitching mechanism and the backward pitching mechanism respectively. One end of the forward lifting mechanism and one end of the backward lifting mechanism are connected with the forward pitching mechanism and the backward pitching mechanism respectively, and the other ends thereof are connected with the forward and backward swing mechanisms respectively. One end of the forward four-connecting rod mechanism and one end of the backward four-connecting rod mechanism are connected with the forward and backward swing mechanisms respectively, and the other ends thereof are connected with a guide rail support. The mass center adjusting mechanism is installed on the guide rail support and is used for realizing adjustment of the mass center of the robot. The patrol robot mechanism has the advantages of being simple and compact in structure and strong in obstacle crossing ability, and being capable of crossing complex barriers, such as strain clamps and parallel groove clamps and the like.

The invention relates to a pipeline flexible crawling robot which comprises a forward walking mechanism, a backward walking mechanism and a steering mechanism, wherein the steering mechanism is arranged between the forward and backward walking mechanisms; each of the forward and backward walking mechanisms comprises an engine base, a primary motor, a secondary motor, a worm, a support disc, a leadscrew, a nut, a spring, a sliding sleeve, a baffle ring, a guide rod, a swinging arm component and a connecting rod; the swinging arm component comprises an arm rest, a chain, a worm gear set and a gear set. The primary motor drives the gear set to rotate through worm drive and chain wheel drive; the secondary motor flexibly drives a gear of the swing arm component to radially support or leave the inner wall of the pipeline through a screw drive pair composed of the nut and the lead screw, the spring, the sliding sleeve and the connecting rod; the steering mechanism comprises a motor, a cam,a driving lever, a support plate, a main spring and a connecting piece; the connecting piece passes through the cam and the support plate and then is connected with the forward and backward walking mechanisms. While the cam and the driving lever push / pull the connecting piece, the motor forces the forward and backward walking mechanisms to deflect mutually. The pipeline flexible crawling robot provided by the invention has the advantages of simple structure and great tractive force and can crawl and turn along the inner wall of the pipeline.

The invention relates to a reciprocating linear walking drive mechanism, in particular to a two-way overload protective device for the reciprocating linear walking drive mechanism. According to the technical proposal provided by the invention, the two-way overload protective device for the drive mechanism comprises an outer cylinder and a pull rod capable of moving up and down in the outer cylinder; and a spring is sleeved outside the pull rod in the outer cylinder. The two-way overload protective device is characterized in that the spring comprises a first spring on the upper part and a second spring on the lower part; the pull rod between the first spring and the second spring is fixedly connected with a first pressure plate; the first pressure plate is provided with a thrust bar; the position, corresponding to the thrust bar, on the lateral wall of the outer cylinder is provided with a push rod hole; the outward extending end of the thrust bar extends out of the push rod hole; the end part of the outward extending end of the thrust bar is provided with a working face; the outside, corresponding to the position of the thrust bar, of the outer cylinder is provided with a travel switch; a contact head of the travel switch is matched with the working face. The two-way overload protective device can provide overload protection for the drive mechanism during both forward walking and backward walking.

The present invention provides a treadmill for allowing an exerciser to perform walking or running exercise on an endless belt. The treadmill is selected to be operated in a forward movement mode or in a reverse movement mode. In the reverse movement mode, a control unit of the treadmill controls a driving device to drive a top surface of the endless belt to slide forward for allowing the exerciser to simulate backward walking. When a detecting device detects that the exerciser enters a warning area in front of a normal range of movement, a reaction mechanism would be triggered to control the driving device to slow down or stop the endless belt. In the forward movement mode, the control unit controls the driving device to drive the top surface of the endless belt to slide backward and to disable the reaction mechanism.

The present invention provides a treadmill for allowing an exerciser to perform walking or running exercise on an endless belt. The treadmill is selected to be operated in a forward movement mode or in a reverse movement mode. In the reverse movement mode, a control unit of the treadmill controls a driving device to drive a top surface of the endless belt to slide forward for allowing the exerciser to simulate backward walking. When a detecting device detects that the exerciser enters a warning area in front of a normal range of movement, a reaction mechanism would be triggered to control the driving device to slow down or stop the endless belt. In the forward movement mode, the control unit controls the driving device to drive the top surface of the endless belt to slide backward and to disable the reaction mechanism.

The invention discloses a safe fitness electric backward walking machine for old people, and belongs to the field of fitness equipment. The safe fitness electric backward walking machine comprises a machine frame, a walking strap, a left front supporting rod, a right front supporting rod, a left transverse grab rail, a right transverse grab rail, an instrument control panel, a left vertical grab rail, a right vertical grab rail, a transverse rod, safe protective straps, a chest binding strap, an arm extension apparatus and pull straps. The safe fitness electric backward walking machine is characterized in that a motor is installed below a cover plate on the right side of the machine frame, the rear middle portions of the left side and the right side of the machine frame are provided with the left and right vertical grab rails perpendicular to the machine frame. The upper ends of the left and right vertical grab rails are connected through the transverse rod. The two ends of the transverse rod are fixedly provided with the safe protective straps. The lower end of the safe protective strap is connected with the chest binding strap. The arm extension apparatus is installed in front of the middle of the transverse rod. The left and right transverse grab rails and the left and right vertical grab rails are provided with the pull straps. The old exercisers can train the arms when backward walking under the protection of the safe protective straps, and multiple purposes are achieved. The safe fitness electric backward walking machine is simple, solid and novel in structure, and suitable for safe backward-walking fitness of old exercisers.

The invention provides a rod-holding and backward walking machine with a sliding base as well as mounting and use methods of the rod-holding and backward walking machine, and belongs to the fields ofexercise machines and exercise methods. The rod-holding and backward walking machine comprises an electric backward walking machine body, and is characterized in that left and right limiting groove rack front frames, left and right limiting groove rack rear frames, left and right linear guider rails, left and right moving rod limiting grooves, left and right sliders with locks, left and right bearings with bases, left and right bearing shafts, left and right moving rod brackets, left and right sleeving type telescopic moving rods, left and right compression springs, left and right handles, a locking mechanism, and left and right protection boards are respectively arranged on left and right running platform racks, wherein the width of the moving rod limiting grooves is adjustable, and safety protection devices are arranged. The rod-holding and backward walking machine has the advantages of being simple, attractive, firm and space-saving, and has the dual efficacies of rod-holding exercise and backward walking, the resistance intensity can be adjusted, meanwhile, the upper half body and the lower half body are exercised, various exercise methods are available, exercise can be carriedout when electricity is available or not available, the safety factor of exercise is enhanced, and the movement method, movement pleasure and movement effect are increased.

The invention relates to a motorized treadmill capable of bidirectional movement, which allows sporters to walk in situ or run on an annular belt body capable of revolution in a cyclic manner. The treadmill can be selected with a forward kinematic mode or a reverse kinematic mode. In the reverse kinematic mode, a control unit of the treadmill controls a driving device to enable the top surface of the annular belt body to slide forwardly from the back and enable the sporters to simulate the movement of backward walking, in a moving process, when a detecting device detects that the sporters enter a preset warning region in front of a normal moving range, a reaction mechanism of the control unit is triggered, and the driving device is controlled to enable the annular belt body to slow down or stop rotation; and in the forward kinematic mode, the control unit controls the driving device to enable the top surface of the annular belt body to slide backwardly from the front and stop the reaction mechanism.

The invention provides a novel safe backward walking machine and belongs to the field of health and fitness facilities. The novel safe backward walking machine comprises an electric running machine treadmill, a left bottom frame, a right bottom frame, a left front supporting column, a right front supporting column, a left rear supporting column, a right rear supporting column, a left long telescopic connecting rod, a right long telescopic connecting rod, a display screen, a left short telescopic connecting rod, a right short telescopic connecting rod, a control panel, a left vertical armrest rod, a right vertical armrest rod, a left spring exerciser, a right spring exerciser, a high grab bar, safety belts and a chest and abdomen constraining belt. The novel safe backward walking machine is characterized in that a running belt on the electric running machine treadmill moves forwards, the safety belts are provided, the control panel and the display screen are separated and are respectively adjusted in position and angle, and the spring exercisers are provided. The novel safe backward walking machine has the advantages that the control panel and the display screen can be adjusted to be at appropriate position and angles so that an exerciser can walk backwards at a proper posture; the safety belts are provided, so that no accident occurs when the exerciser walks backwards; the spring exercisers are provided so that the exerciser can perform vertical stretching movements with two hands while walking backwards, two things are achieved at one stroke, and an exercising effect is better.

The invention discloses backward walking eyeglasses for elderly people, comprising a semicircular hairband, wherein, the hairband is symmetrically equipped with a pair of universal joints; a rearview mirror is arranged at the other end of each universal joint; and the rearview mirrors are equipped with fixing bands under the hairband. The backward walking eyeglasses have simple structure, and a backward walking exerciser can conveniently observe the situation behind the body through the rearview mirrors, thus avoiding unnecessary collision, tumbling and the like; and the rearview mirrors are fixed by the fixing bands, thus the exerciser does not have to worry about dropping. When the eyeglasses are not used, each component can be directly dismantled and then carried, thus being convenient and practical.

The invention discloses a backward walking rearview mirror, which consists of a mirror bracket, mirror assemblies and gaskets. The mirror bracket is clamped on the head of a user, two mirror assemblies are connected to one end of the mirror bracket, and mirror rods of the mirror assemblies are connected with the mirror bracket into a whole. The gaskets are respectively arranged at two ends of the bent part of the mirror bracket and two ends of a cross beam, and the gaskets and the mirror bracket are connected into a whole. Each gasket consists of a cloth wrapped sponge ball, so that the comfort degree of the user during use is improved.

The invention relates to a non-transverse-handrail multifunctional safety backward walking machine, and belongs to the field of fitness equipment. The non-transverse-handrail multifunctional safety backward walking machine comprises a left underframe, a right underframes, an electric running machine treadmill, a left fr0ont upright, a right front upright, a left rear upright, a right rear upright, a left vertical grab bar, a right vertical grab bar, a high grab bar, a left spring exerciser, a right spring exerciser, an instrument control panel, a left connecting rod, a right connecting rod, a safety belt, a chest binding abdominal belt, a shock pad and rollers. The non-transverse-handrail multifunctional safety backward walking machine is characterized in that no transverse handrail is provided; the non-transverse-handrail multifunctional safety backward walking machine is provided with the upper limb spring exercisers; and a user can safely walk backwards. The non-transverse-handrail multifunctional safety backward walking machine has the advantages that the contradictions that a backward walking body builder likes to walk backwards, but is afraid of falling down so as not to dare to walk backwards and due to causes of weather, places, time and the like, the backward walking body builder cannot walk backwards are relieved, and an exerciser sufficiently enjoys the benefits of backward walking health maintenance; when the exerciser holds the vertical grab bars and the high grab bar to exercise or simultaneously performs upper limb strength exercise, a better exercising effect can be further brought; and the non-transverse-handrail multifunctional safety backward walking machine can be folded, has a damping effect and is movable.

The invention provides a multiple safety rod holding backward walking machine and a rod holding backward walking body building method thereof, and belongs to the field of health and fitness facilitiesand body building methods. The multiple safety rod holding backward walking machine comprises an electronic treadmill. The machine is characterized the machine is configured with left and right guiderails, left and right rollers, left and right handle rods, left and right rotating shafts, left and right limiting grooves, a resistance device, and a positioning device. The rollers are a gear-typerolling structure. Beneficial effects are that the machine does not waste space, the structure is firm, steps would not tread out a belt, the machine has dual effects of rod holding walking and backward walking, and completely meets motion features of rod holding walking. A multiple safety protection method makes backward walking safe and guaranteed, and persons in different physiques can take proper exercise according to different methods. The handle rods can be pushed forward and pulled backward, and can swing forward and backward or be fixed. Various rod holding backward walking body building methods are included, and rod holding training and backward walking training can be performed at the same time or performed separately. The plurality of training methods can be switched, so as to improve sport enjoyment and sport effects. The method and the machine are a brand new aerobic exercise method and an exerciser.

The present invention relates to a functional footwear which comprises an insole having a toe-seating portion, whose height is higher than that of the remaining portion thereof other than the toe-seating portion, for allowing a user's toe to be seated thereon. The toe-seating portion of the insole of the functional footwear is formed higher than the remaining portion of the insole other than the toe-seating portion, so that toes of a walker are placed higher than the other portions of the sole of the feet of the walker, thereby obtaining an effect of the backward walking even when the walker walks forwardly.

The invention relates to the technical field of fitness auxiliary equipment, in particular to a fitness backward walking wing mirror. The fitness backward walking wing mirror comprises an adjustable headband, and is characterized in that a stabilizing cushion block which is matched with the back of the head of the human body is fixed in the middle of the rear of the adjustable headband, the inner side of the stabilizing cushion block is provided with a skin-friendly gasket, and the outer side of the stabilizing cushion block is provided with a radar ranging alarm device; a support frame which is matched with the forehead of the human body is fixed in the middle of the front of the adjustable headband, and the inner side of the support frame is also provided with a skin-friendly gasket; a support rod which is vertically arranged is fixed in the middle of the outer side of the support frame, and the top of the support rod is hinged to a telescopic rod; the tail end of the telescopic rod is hinged to a wing mirror body. The fitness backward walking wing mirror has the advantages of being simple in structure and ingenious in design, the problem that when walking backwards, people cannot check the back environment in real time is solved, and through the arranged radar alarm device, basic guarantee is provided for the people when the people conduct movement of backward walking.

The invention discloses a walking chassis mechanism. When a rotary motor is braked, forward or backward walking of the chassis mechanism is realized by respectively controlling two driving wheels to run at the same speed and in the same direction; when the rotary motor is braked, the turning of the chassis mechanism is realized by controlling the two driving wheels run at differential speeds and in the same direction; when the rotary motor is braked, in-situ rotation of the chassis mechanism is realized by controlling the two driving wheels to run at the same speed and in opposite directions;and when the rotary motor is in a driving state, the two driving wheels are controlled to run at the same speed and in the opposite directions, so that the forward direction of a driving wheel frame and the forward direction of a chassis form a certain deflection angle, and then the two driving wheels are forced to run at the same speed and in the same direction to achieve the purpose of translating in any direction. The front-back walking and the front-back turning walking of the walking chassis mechanism can be realized, and the translation in any direction and the in-situ rotation can alsobe realized. The invention also provides a robot with the walking chassis mechanism.

The invention discloses a pair of auxiliary glasses for backward-walking fitness exercises. The pair of auxiliary glasses comprises a frame, legs arranged at the two ends of the frame, and an auxiliary device. The auxiliary device includes a camera assembly and a display screen. The camera assembly is arranged at the end portion of the leg in a rotating manner and establishes Bluetooth connectionwith a mobile phone; and the rotation of the camera is controlled based on an operation command from the mobile phone. The display screen arranged at the frame is connected with the camera by a line and is used for displaying a picture shot by the camera. With the auxiliary device based on the original glasses, the pair of auxiliary glasses is used for backward-walking fitness. The camera assemblycaptures the road condition on the walking route and the information is displayed on the display screen; and thus the user can observe the road condition behind the user without turning back, so thatthe safety factor is increased and the fitness effect is improved. Since the camera rotates based on the operation instruction from the mobile phone, multi-angle observation is realized and thus thedangerous situation is avoided, so that the personal safety of the user is protected.

The invention discloses a backward walking rearview mirror, which consists of a mirror bracket, mirror assemblies and gaskets. The mirror bracket is clamped on the head of a user, two mirror assemblies are connected to one end of the mirror bracket, and mirror rods of the mirror assemblies are connected with the mirror bracket into a whole. The gaskets are respectively arranged at two ends of the bent part of the mirror bracket and two ends of a cross beam, and the gaskets and the mirror bracket are connected into a whole. Each gasket consists of a cloth wrapped sponge ball, so that the comfort degree of the user during use is improved.

The invention discloses a rear-view sun helmet for backward walking comprising a sun helmet and a brim, a rack fixed to the top part of the brim, and a rear-view circular mirror fixed to the rack, the diameter of the rear-view circular mirror being no longer than 10 centimeters. The rear-view sun helmet of the invention facilitates comfortable backward walking for people who do physical exercise and facilitates rehabilitation of lumbar vertebra and cervical vertebra. With ordinary sun helmets, people often fail to observe what's going on behind them during backward walking, whereas the rear-view sun helmet of the invention by adding a rear-view circular mirror to the brim of a sun helmet, enables people to observe road conditions during backward walking. The rear-view sun helmet of the invention eliminates possible incidents during backward walking, and is also characterized by easy arrangement, low cost, and is in particular fit for the middle-elderly population who love doing physical exercise.

The invention discloses a backward walking type self-propelled working machine. The backward walking type self-propelled working machine comprises a walking assembly, a drive motor and a handle device, and further comprises a sensing module and a control module; the backward walking type self-propelled working machine has a low-speed driving mode and a self-adaptive mode; when thrust is smaller than a first preset value, the backward walking type self-propelled working machine is in the low-speed driving mode; when the thrust is larger than a second preset value, the backward walking type self-propelled working machine is also in the self-adaptive mode; when the backward walking type self-propelled working machine is in the low-speed driving mode, the control module controls the rotating speed of the drive motor to be smaller than or equal to a first preset rotating speed; and when the backward walking type self-propelled working machine is in the self-adaptive mode, the control modulecontrols the drive motor to change towards an expected rotating speed obtained according to the thrust, and the expected rotating speed is larger than the first preset rotating speed. The backward walking type self-propelled working machine is convenient to operate and high in reliability.

The invention discloses a safe backward walking machine, and belongs to the field of health and fitness facilities. The safe backward walking machine comprises a running machine rack. The safe backward walking machine is characterized in that the height, the angle and the front-back distance of an instrument control panel can be adjusted, and the safe backward walking machine is provided with two middle transverse grab rails, two vertical grab rails, a high transverse grab rail and four safe belts and has the backward walking function; due to the fact that the height, the angle and the front-back distance of the instrument control panel can be adjusted, an exerciser can run in the correct posture, and therefore harm, generated due to the fact that the instrument control panel is too high or too low or too close, to the lumbar vertebra, the cervical vertebra and other joints of the exerciser can be completely eradicated; the middle transverse grab rails, the vertical grab rails, the high transverse grab rail and the safe belts are connected with a thoracic and abdominal binding belt, a safe lock and a heart rate detection alarm to form multi-protection, and therefore the safety of the exerciser in keep-fit exercises can be guaranteed; the better exercising effect can also be achieved when the exerciser holds the vertical grab rails and the high transverse grab rail to take exercises; the exerciser can fully enjoy the benefit of backward walking health maintenance.

The invention discloses a backward walking type self-propelled working machine. The backward walking type self-propelled working machine comprises a main unit and a handle device, wherein the main unit comprises a walking assembly and a driving motor for driving the walking assembly; the handle device is connected to the main unit to allow a user to operate the backward walking type self-propelledworking machine on the rear side of the backward walking type self-propelled working machine; the handle device comprises an operating piece, a connecting rod, a pressure sensor and a pressing piece;the operating piece comprises a holding part for the user to hold; the connecting rod is connected to the main unit; the pressure sensor is arranged between the operating piece and the connecting rod; when the holding part is subjected to thrust, the pressing piece applies acting force in the preset linear direction to the sensor so as to drive the pressure sensor to deform; and the ratio of thecomponent force, in the preset linear direction, of the thrust borne by the holding part to the deformation quantity, in the preset linear direction, of the pressure sensor is larger than or equal to40 N / mm and smaller than or equal to 1200 N / mm. The backward walking type self-propelled working machine is convenient to operate and high in reliability.

The invention relates backward walking back vision equipment. The backward walking back vision equipment is provided with a shoulder strap. A supporting stud is mounted on the shoulder strap, and thesupporting stud is rotationally connected with an L-shaped supporting rod. The L-shaped supporting rod is connected with a telescopic rod through a rotary clamping mechanism, and a T-shaped three-wayjoint is mounted at the front end of the telescopic rod. A joint body in the middle of the T-shaped three-way joint is rotationally clamped with the telescopic rod, and two L-shaped two-way joints m are rotationally clamped on the joint bodies at the two ends of the T-shaped three-way joint correspondingly. One end of each L-shaped two-way joint m is rotationally clamped with the corresponding endof the T-shaped three-way joint. The other end of each L-shaped two-way joint m is connected with a supporting connecting rod. The upper ends of the supporting connecting rods are rotationally clamped with L-shaped two-way joints n, and the joint body at the upper end of each L-shaped two-way joint n is provided with a bean-half-shaped girdling multiway joint. The equipment is comprehensive and wide in back vision view field, all view angles are extremely convenient to adjust, and wearing is comfortable; and a buffering and damping effect is achieved, the stability in the use process is good,and the popularization value and the practicality are prominent.

A forward and reverse walking multi-legged platform is composed of four identical first to fourth leg groups A, B, C, D and a frame E. The first leg group A is composed of a left side walking part A and a right side walking part B. 1. Right walking part A-2 and a dual output shaft motor 1. The left running part A-1. Right walking part A-2 are respectively connected to both ends of the dual outputshaft motor 1. Left walking part A of the first leg group A-1 By Lower Leg A-1-1 and upper leg A-1-2, can realize that forward and backward walk of the whole machine of the multi-foot carry platform.Right running part A-2 with that left walk part A-1 are identical in shape, mechanical structure, and assembly method. The forward and backward walking multi-foot loading platform of the invention comprises a single leg group driven by a double output shaft motor, an upper leg and a lower leg are arranged so as to realize the walking movement of sixteen feet on the front side and eight feet on theopposite side of the whole machine, and the adaptability and reliability of the loading platform are improved. The reasonable application of the closed-chain linkage mechanism makes the load performance of the platform more outstanding.

The present invention provides special monocoque coach tire assembly equipment, which comprises a body, wherein the rear end of the body is provided with a bracket extending along a vertical direction, the bracket is provided with a lifting oil cylinder, the piston rod of the lifting oil cylinder is connected to an auxiliary support extending along a horizontal direction and used for supporting and lifting a tire, a walking mechanism is arranged below the body, the auxiliary support comprises two drums arranged at interval, the height of the lifting oil cylinder can be slightly adjusted, a control system assembly electrically connected to the lifting oil cylinder and a tire edge drive motor is arranged in the body, and a control rod is arranged above the body and is provided with a lifting control button and a moving control button electrically connected to the control system assembly. According to the present invention, the special equipment is designed and produced, has the up-and-down lifting and forward-and-backward walking function, is suitable for the installation of plural specifications of tires, and has the safe and reliable positioning support device, such that the efficient installation of the monocoque coach tire is achieved, the difficult problem of the installation of the plug-in monocoque coach tire is effectively solved, the installation efficiency is improved, and the promotion value is high.

The invention discloses a backward walking rearview mirror which comprises a first pipe, a second pipe and a reflector, wherein the first pipe is a telescopic pipe; when an elastic limiting bump is accommodated into a recess of a folded position, the first pipe is parallel to the second pipe; when the elastic limiting bump is accommodated into a recess of an expanded position, the first pipe is vertical to the second pipe; a third magnet and a fourth magnet or an iron body are attracted by each other; when a guide bump is located in a groove of the expanded position, a connecting rod, the first pipe and the second pipe are located in the same plane; and when the guide bump is located in a groove of the folded position, the connecting rod is vertical to the plane in which the first pipe and the second pipe are located. The accommodating volume of the backward walking rearview mirror is reduced.