Extensible multipurpose electric bicycle tail box

Abstract

The utility model discloses an extensible multipurpose electric bicycle tail box which comprises a backrest and a tail box body which are arranged front and back, a telescopic structure is arranged between the backrest and the tail box body, the telescopic structure is sleeved with a storage sleeve in a penetrating mode or connected with the storage sleeve in a contacting mode, and the backrest can move front and back relative to the tail box body. The tail box is provided with a sliding limiting device for sliding limiting of the telescopic structure. After the tail box is unfolded, the storage space can be increased, a backrest can be provided for the waist of a driver, after the tail box is contracted, the backrest can be leaned on by a backseat person, and during long-distance riding, the waist of the riding driver leans on the backrest, so that waist fatigue is effectively relieved and relaxed. The vibration electromagnetic massager is further arranged on the backrest, the waist and the back can be massaged during riding, and fatigue is relieved more effectively.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle and bicycle trunks, in particular to an expandable multi-purpose electric vehicle and bicycle trunk. Background Art

[0002] As traffic becomes more and more congested, more and more electric bicycles are used in cities, and many working-class people choose electric bicycles as a means of transportation to and from get off work. Many people put their belongings in the trunk, but most existing trunks have small capacity and are often full before they can put many items. In addition, the existing trunks of electric bicycles are fixed on the rear seat shelves, and their functions are relatively simple, and they cannot meet people's needs due to limited space.

[0003] The internal volume of the trunk of existing electric vehicles is mostly small, only enough to accommodate a helmet, and it is not convenient for users to load other items.

[0004] Therefore, it is necessary to design an expandable multi-purpose electric bicycle tail box to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of the utility model is to solve the problems existing in the prior art and provide an expandable multi-purpose electric bicycle trunk. When the trunk is unfolded, it can increase the storage space and provide a backrest for the driver's waist. When it is retracted, it can provide a backrest for the rear seat passengers to lean on. When riding for a long distance, the driver's waist can lean on the backrest, so that the waist fatigue can be effectively relieved and relaxed. In addition, the backrest is also equipped with a vibrating electromagnetic massager, which can massage the waist and back during riding, and relieve fatigue more effectively.

[0006] The technical solution to achieve the purpose of this utility model is:

[0007] The invention discloses an expandable multi-purpose electric bicycle trunk, comprising a backrest and a trunk arranged at the front and rear, a telescopic structure being arranged between the backrest and the trunk, a storage cover being worn on or in contact with the telescopic structure, and the backrest being movable forward and backward relative to the trunk; and a sliding limit device being arranged at the trunk to limit the sliding of the telescopic structure.

[0008] The telescopic structure is a horizontal telescopic rod or a scissors-type telescopic rod. The horizontal telescopic rod and the scissors-type telescopic rod correspond to the first sliding limit device and the second sliding limit device respectively to slide and limit the horizontal telescopic rod and the scissors-type telescopic rod.

[0009] The horizontal telescopic rods are a plurality of left and right sliding support rods arranged on the back of the backrest, and the tail box is provided with horizontal slide rails that are slidably matched with the sliding support rods.

[0010] The storage cover is an accordion-shaped U-shaped storage cover with an open upper end, and two ends are respectively fixed on the back of the backrest and the outer wall of the trunk. The storage cover is inserted into the sliding support rods on the left and right sides.

[0011] The sliding support rod is provided with a plurality of positioning holes at intervals along the length direction. The first sliding limit device adopts a spring lock pin structure. The trunk is built with a spring lock pin structure which cooperates with the positioning holes on both sides for positioning. The spring lock pin structures on both sides are unlocked by linkage through an unlocking pin structure.

[0012] The spring lock pin structure includes a pin body and a compression spring; the unlocking pin structure includes a connecting rope connecting the pin bodies on both sides, and a longitudinal pressure rod connected to the connecting rope, the longitudinal pressure rod is reset by rotating the reset spring, the top end of the longitudinal pressure rod is fixedly connected to the rotating button installed on the top of the trunk, and the bottom end is movably connected to the built-in hole of the fixed block installed on the bottom surface of the trunk; the length of the connecting rope matches the spacing between the pin bodies on both sides when the spring lock pin structure is locked.

[0013] The spring lock pin structure comprises a pin body and a compression spring, and the pin head of the pin body is arranged at an oblique angle to facilitate the forward stretching of the backrest.

[0014] The scissor-type telescopic rods are three scissor-type telescopic rods arranged vertically on the left and right sides of the backrest and horizontally at the lower end. The second sliding limit device adopts two straight telescopic lifting rods to be vertically fixed in the tail box, and the ends of the scissor-type telescopic rods away from the backrest extend into the tail box and are connected with the straight telescopic lifting rods.

[0015] The two ends of the scissor fork telescopic rod are provided with two rods, one of the rods at the connection of the vertical scissor fork telescopic rods and the back of the backrest is fixedly connected to the back of the backrest, and the other rod is movably connected to the back of the backrest, one of the rods at the connection of the vertical scissor fork telescopic rods and the tail box on both sides is fixedly connected to the fixed column in the tail box, and the other rod is connected to the sliding positioning shaft of the one-word telescopic lifting rod arranged on the fixed column, and one of the rods at the connection of the horizontal scissor fork telescopic rod and the back of the backrest is fixedly connected to the back of the backrest, and the other rod is movably connected to the back of the backrest, one of the rods at the connection of the horizontal scissor fork telescopic rod and the tail box at the lower end is fixedly connected to the rod arranged in the tail box, and the other rod is movably connected to the rod arranged in the tail box. When the backrest is stretched or contracted, the rod of the vertical scissor fork telescopic rod movable in the back of the backrest and the rod of the scissor fork telescopic rod on the sliding positioning shaft of the one-word telescopic lifting rod on the same side are maintained on the same horizontal line, and the horizontal scissor fork telescopic rod at the lower end is only telescopic and not positioned for receiving and placing objects.

[0016] The second sliding limit device adopts two vertical straight telescopic lifting rods, and the maximum length of the vertical straight telescopic lifting rods is adapted to the maximum height of the tail box buckle.

[0017] The storage cover is an accordion-shaped U-shaped storage cover with an open upper end. The two ends of the storage cover are respectively fixed to the back of the backrest and the outer wall of the trunk. The storage cover is placed in a U-shaped groove formed by the left and right sides between the backrest and the trunk and the lower end of the scissor-fork telescopic rod combination.

[0018] The front of the backrest adopts high-efficiency sponge with an arc that fits the waist. A vibrating electromagnetic massager is arranged in front of the backrest. The vibrating electromagnetic massager is connected to the power supply of the electric vehicle or bicycle. A switch for controlling the vibrating electromagnetic massager is arranged on the backrest.

[0019] The advantages and effects of this technical solution are:

[0020] 1. In this technical solution, the backrest cooperates with the horizontal slide rail of the trunk through the back sliding support rod, and the backrest can slide forward and backward relative to the trunk. By adjusting the spring lock pin structure into a suitable positioning hole, the distance between the backrest and the trunk can be locked to achieve the adjustment of the backrest support position.

[0021] The backrest support position of the technical solution can be flexibly adjusted according to the driver, so that the back of a single-person electric bicycle rider can be effectively supported, providing a safer and more comfortable driving experience, making the driver less tired and driving safer.

[0022] 2. The positioning mechanism of this technical solution adopts a spring lock pin structure. When in use, you only need to pull the backrest outward to make the positioning hole come out along the bevel of the pin head. When storing the backrest, you only need to rotate the rotating button on the top of the unlocking pin structure, or the positioning mechanism adopts a straight telescopic lifting rod to push the backrest back smoothly. No auxiliary tools are required, and it is easy to operate and use.

[0023] 3. The technical solution is reasonably designed. The left and right sets of sliding matching structures only use the space on the side of the trunk, which does not affect the storage function of the trunk. It has a simple structure, low cost, easy use, beautiful and practical appearance.

[0024] 4. In the technical solution, the two ends of the storage cover are respectively fixed on the back of the backrest and the outer wall of the trunk. When the backrest is stretched, the storage cover is stretched and expanded along with the telescopic structure, forming an extended storage space with the backrest and the trunk, which can store more items. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the backrest in the unfolded state of Example 1;

[0026] Figure 2 This is a schematic diagram of the structure of the backrest in the stowed state of Example 1;

[0027] Figure 3 This is a schematic diagram of the working of the spring lock pin structure and the unlock pin structure in Example 1;

[0028] Figure 4 This is a schematic diagram of the spring lock pin structure in Example 1;

[0029] Figure 5 This is a schematic diagram of the structure of the backrest in the unfolded state of Example 2;

[0030] Figure 6 This is a schematic diagram of the structure of the backrest in the stowed state of Example 2;

[0031] Figure 7 It is a schematic diagram of the connection between the vertical scissor telescopic rod, the straight telescopic lifting rod and the backrest in Example 2;

[0032] Figure 8 This is a schematic diagram of the structure of the storage cover in Example 1.

[0033] In the figure, 1. tail box, 11. horizontal slide rail, 2. backrest, 3. sliding support rod, 31. positioning hole, 4. spring lock pin structure, 41. pin body, 411. limit block, 42. compression spring, 43. limit end cover, 5. unlocking pin structure, 51. connecting rope, 52. longitudinal pressure rod, 53. reset spring, 54. rotation button, 6. extended backrest, 7. scissors-type telescopic rod, 8. straight telescopic lifting rod, 9. storage cover, 10. vibrating electromagnetic massager. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with embodiments, but the present invention is not limited to these embodiments. Example 1

[0035] Reference Figure 1 , Figure 2 The invention discloses an expandable multi-purpose tail box of an electric bicycle, comprising a backrest 2, a tail box 1, a sliding support rod 3, a storage cover 9, a spring lock pin structure 4 and an unlocking pin structure 5. The backrest 2 is arranged at the front end of the tail box 1, and four sliding support rods 3 are arranged on the back of the backrest 2. The tail box 1 has a built-in horizontal slide rail 11 that slides with the sliding support rod 3. The backrest 2 can move forward and backward relative to the tail box 1 through the sliding cooperation between the sliding support rod 3 and the horizontal slide rail 11. The storage cover 9 is sleeved on the four sliding support rods 3. The four sliding support rods 3 are arranged on the left and right sides to improve the supporting stability of the backrest 2. The sliding cooperation structure on both sides only uses the space on the side of the tail box 1 and does not affect its storage function. The storage cover 9 is sleeved on the four sliding support rods 3 to form an expanded placement space, which can be used to place and store more items.

[0036] like Figure 8 As shown, the storage cover 9 is an accordion-shaped, foldable and retractable U-shaped storage cover with an open upper end. The two ends of the storage cover 9 are respectively fixed to the back of the backrest 2 and the outer wall of the trunk 1. Notches for four sliding support rods 3 to pass through are arranged on both sides of the storage cover 9. The storage cover 9 is inserted into the four sliding support rods 3 on the left and right sides between the back of the backrest 2 and the trunk 1. The maximum stretching length of the storage cover 9 is less than the maximum stretching length of the sliding support rods 3 and the horizontal slide rail 11. The storage cover 9, the backrest 2 and the trunk 1 are expanded to form a storage space, which can store more items.

[0037] The sliding support rod 3 is provided with a plurality of positioning holes 31 at intervals along the length direction, and the trunk 1 has four built-in spring lock pin structures 4 which are respectively matched with the positioning holes 31 on both sides for positioning. The spring lock pin structures 4 are matched with the positioning holes 31 to adjust the distance between the backrest 2 and the trunk 1. The spring lock pin structures 4 on both sides are symmetrically arranged and are unlocked by the unlocking pin structure 5.

[0038] like Figure 4 As shown, the spring lock pin structure 4 is installed on the lock pin installation hole opened on the side wall of the trunk 1. The spring lock pin structure 4 includes a pin body 41, a compression spring 42 and a limit end cover 43. The compression spring 42 is sleeved on the pin body 41. The front end of the compression spring 42 abuts against a limit block 411 (located behind the pin head) opened on the side wall of the pin body 41, and the rear end acts on the limit end cover 43. In the embodiment, the pin head is set at an angle that facilitates the forward stretching of the backrest 3. The inner wall of the lock pin installation hole is provided with a guide groove that cooperates with the outer end of the limit block 411, and the pin body 41 is limited to rotate through the guide groove.

[0039] like Figure 3 As shown, the unlocking pin structure 5 is installed in the trunk 1, and includes a connecting rope 51, a longitudinal pressure rod 52, a reset spring 53 and a rotating button 54. In this example, there are two connecting ropes 51, and the two ends of each connecting rope 51 are respectively connected to the two side pin bodies 41 of the connecting rope 51 on the same horizontal plane. The length of the connecting rope 51 matches the spacing between the two side pin bodies 41 when the spring lock pin structure 4 is locked. The connecting rope 51 does not provide tension to the two side pin bodies 41 in the non-unlocking state. The longitudinal pressure rod 52 is fixedly connected to the middle of the two connecting ropes 51, the top end is fixedly connected to the rotating button 54 installed on the top of the trunk 1, and the bottom end is movably connected to the built-in hole of the fixed block installed on the inner bottom surface of the trunk 1. One end of the reset spring 53 is fixedly connected to the inner wall of the trunk 1, and the other end is fixedly connected to the longitudinal pressure rod 52. When the rotating button 54 is twisted, the longitudinal pressure rod 52 is driven to rotate, and the reset spring 53 is stretched. When the rotating button 54 is released, the reset spring 53 is reset due to elastic force, and the longitudinal pressure rod 52 can be rotated and reset.

[0040] like Figure 1 , Figure 2 As shown, the top of the backrest 2 is hinged with an extended backrest 6 through a flap hinge. The extended backrest 6 can be flipped down and stored on the back side of the backrest 2. The width of the extended backrest 6 is less than the spacing between the sliding support rods 3 on both sides. The backrest 2 and the extended backrest 6 are filled with high-efficiency sponges with a curvature that fits the waist. A vibrating electromagnetic massager 10 is provided on the front of the backrest 2. The vibrating electromagnetic massager 10 is connected to the power supply of the electric bicycle, and a switch for controlling the vibrating electromagnetic massager 10 is provided on the backrest 2.

[0041] When using the backrest 2, you only need to pull the backrest 2 outward to a suitable position, and then flip up and extend the backrest 6 to increase the backrest height, which can meet riding needs and improve the comfort of single-person driving. The storage cover 9 is unfolded with the extension of the backrest 2, and forms an extended space with the backrest 2 and the trunk 1 to accommodate items. Figure 3 As shown by the arrow, when the backrest 2 is stored, the rotating button 54 on the top of the unlocking pin structure 5 is rotated, and the longitudinal pressure rod 52 is rotated inward to retract the connecting rope 51, so that the pin bodies 41 on both sides slide inward to unlock, and the backrest 2 can be pushed back smoothly to complete the storage of the device. The operation is simple. Example 2

[0042] like Figure 5 , Figure 6 , Figure 7 As shown, an expandable multi-purpose electric bicycle trunk includes a backrest 2, a trunk 1, a scissor-type telescopic rod 7, a storage cover 9 and a straight telescopic lifting rod 8. The backrest 2 is arranged at the front end of the trunk 1. Three scissor-type telescopic rods 7 are arranged vertically on the left and right sides and horizontally at the lower end of the back of the backrest 2. Two straight telescopic lifting rods 8 are arranged vertically in the trunk 1 to slide with the vertical scissor-type telescopic rods 7. The backrest 2 can move forward and backward relative to the trunk 1 through the sliding cooperation between the scissor-type telescopic rods 7 and the straight telescopic lifting rod 8. The three scissor-type telescopic rods 7 are arranged vertically on the left and right sides and horizontally at the lower end to improve the support stability of the backrest 2. The sliding cooperation structure on both sides only uses the space on the side of the trunk 1, and does not affect its storage function.

[0043] The storage cover 9 is an accordion-shaped, foldable and telescopic U-shaped storage cover with an open upper end. The two ends of the storage cover 9 are respectively fixed to the back of the backrest 2 and the outer wall of the trunk 1. The storage cover 9 in this example does not have a notch for inserting the sliding support rod 3 in Example 1. The storage cover 9 is placed in a U-shaped groove formed by the three scissor-type telescopic rods 7 on the left and right sides and the lower end between the back of the backrest 2 and the trunk 1. The storage cover 9, the backrest 2 and the trunk 1 are expanded to form a storage space, which can store more items.

[0044] like Figure 5 , 6 As shown in , 7 , the trunk 1 is provided with an opening for the extension and retraction of the scissor-type telescopic rod 7 , the ends of the scissor-type telescopic rod 7 extend into the trunk 1 , and the ends of each vertical scissor-type telescopic rod 7 are connected to a straight-line telescopic lifting rod 8 at the vertical position on the same side. By stretching the scissor-type telescopic rod 7 to drive the straight-line telescopic lifting rod 8 to be positioned and unlocked, the distance between the backrest 2 and the trunk body 1 can be adjusted.

[0045] like Figure 7As shown, the two ends of the scissor telescopic rod 7 have two rods, one of the rods at the connection between the vertical scissor telescopic rods 7 on both sides and the back of the backrest 2 is fixedly connected to the back of the backrest 2, and the other rod is movably connected to the back of the backrest 2. One of the rods at the connection between the vertical scissor telescopic rods 7 on both sides and the tail box 1 is fixedly connected to the fixed column in the tail box 1, and the other rod is connected to the sliding positioning shaft of the straight telescopic lifting rod 8 arranged on the fixed column. One of the rods at the connection between the lower end horizontal scissor telescopic rod 7 and the back of the backrest 2 is connected to the back of the backrest 2. The back is fixed, and the other support rod is movably connected to the back of the backrest 2. One of the support rods at the connection between the lower end horizontal scissor telescopic rod 7 and the trunk 1 is fixed to the support rod set in the trunk 1, and the other support rod is movably connected to the support rod set in the trunk 1. When the backrest is stretched or contracted, the support rod of the vertical scissor telescopic rod 7 movable on the back of the backrest 2 and the support rod of the scissor telescopic rod 7 on the sliding positioning axis of the same-side straight telescopic lifting rod 8 are maintained on the same horizontal line, while the lower end horizontal scissor telescopic rod 7 is only extended and not positioned for receiving and placing objects.

[0046] The maximum length of the straight telescopic lifting rod 8 is adapted to the maximum height of the tail box 1 when it is buckled.

[0047] As attached Figure 5 , 6 As shown, the top of the backrest 2 is hinged with an extended backrest 6 through a flap hinge. The extended backrest 6 can be flipped down and stored on the back side of the backrest 2. The width of the extended backrest 6 is less than the spacing between the scissor-type telescopic rods 7 on both sides. The backrest 2 and the extended backrest 6 are filled with high-efficiency sponges with a curvature that fits the waist. A vibrating electromagnetic massager 10 is provided on the front of the backrest 2. The vibrating electromagnetic massager 10 is connected to the power supply of the electric bicycle, and a switch for controlling the vibrating electromagnetic massager 10 is provided on the backrest 2.

[0048] When using the telescopic backrest trunk of an electric bicycle of this embodiment, the backrest 2 only needs to be pulled outward to a suitable position, and the backrest 6 is turned up to increase the backrest height, which can meet the riding needs and improve the comfort of single-person driving. When the backrest is stored, the scissor-type telescopic rod 7 is stretched to drive the straight telescopic lifting rod 8 to the maximum length and slide and unlock, and the backrest 2 can be smoothly pushed back to complete the storage of the device, which is simple to operate.

[0049] The maximum dimension of the storage cover 9 in the above-mentioned Embodiment 1 and Embodiment 2 when stretched matches the maximum distance of stretching of the telescopic structure.

[0050] like Figure 5 , Figure 6As shown, an accordion-shaped cover plate can be provided on the upper end surface of the storage cover 9 as needed, and the width of the cover plate is greater than the distance between the two sides of the storage cover 9. In rainy days, the items in the storage cover 9 are prevented from getting wet. The cover plate is configured as follows: a groove is provided on the back of the backrest 2, the cover plate is placed in the groove on the back of the backrest 2, and one end is fixedly connected to the inner wall of the groove on the back of the backrest 2, and the other end is a movable end. When the backrest 2 is used, the backrest 2 is pulled outward to a suitable position, the backrest 6 is flipped up and extended to increase the height of the backrest, and the cover plate is pulled outward from the groove on the back of the backrest 2 until the storage cover 9 is covered. The cover plate can be fastened with the trunk 1 with a strip of Velcro or a strip of lock to prevent rain from getting the items in the storage cover 9 wet.

Claims

1. An expandable multi-purpose electric bicycle tail box, characterized in that: It includes a backrest and a trunk arranged in front and back, a telescopic structure is arranged between the backrest and the trunk, the telescopic structure is sleeved or in contact with a storage sleeve, and the backrest can move forward and backward relative to the trunk; the trunk is equipped with a sliding limit device to slide the telescopic structure.

2. The expandable multi-purpose electric vehicle bicycle tail box according to claim 1 is characterized in that: The telescopic structure is a horizontal telescopic rod or a scissors-type telescopic rod. The horizontal telescopic rod and the scissors-type telescopic rod correspond to the first sliding limit device and the second sliding limit device respectively to slide and limit the horizontal telescopic rod and the scissors-type telescopic rod.

3. The expandable multi-purpose electric vehicle bicycle tail box according to claim 2 is characterized in that: The horizontal telescopic rods are a plurality of left and right sliding support rods arranged on the back of the backrest, and the tail box is provided with horizontal slide rails that are slidably matched with the sliding support rods.

4. The expandable multi-purpose electric vehicle bicycle tail box according to claim 3 is characterized in that: The storage cover is an accordion-shaped U-shaped storage cover with an open upper end. The two ends of the storage cover are respectively connected to the back of the backrest and the wall of the trunk. The storage cover is inserted into the sliding support rods on the left and right sides between the back of the backrest and the trunk.

5. The expandable multi-purpose electric vehicle bicycle tail box according to claim 3 is characterized in that: The sliding support rod is provided with a plurality of positioning holes at intervals along the length direction. The first sliding limit device adopts a spring lock pin structure. The trunk is built with a spring lock pin structure which cooperates with the positioning holes on both sides for positioning. The spring lock pin structures on both sides are unlocked by linkage through an unlocking pin structure.

6. The expandable multi-purpose electric bicycle trunk according to claim 5, characterized in that: The spring lock pin structure includes a pin body and a compression spring; the unlocking pin structure includes a connecting rope connecting the pin bodies on both sides, and a longitudinal pressure rod connected to the connecting rope, the longitudinal pressure rod is reset by rotation of the reset spring, the top end of the longitudinal pressure rod is fixedly connected to the rotating button installed on the top of the trunk, and the bottom end is movably connected to the built-in hole of the fixing block installed on the bottom surface of the trunk; the length of the connecting rope matches the spacing between the pin bodies on both sides when the spring lock pin is locked; The spring lock pin comprises a pin body and a compression spring, and the pin head of the pin body is arranged at an oblique angle to facilitate the forward stretching of the backrest.

7. The expandable multi-purpose electric vehicle bicycle tail box according to claim 2, characterized in that: The scissor telescopic rods are three scissor telescopic rods arranged vertically on the left and right sides of the backrest and horizontally at the lower end. The second sliding limit device adopts two vertical straight telescopic lifting rods fixed in the tail box. The ends of the scissor telescopic rods away from the backrest extend into the tail box and are connected with the straight telescopic lifting rods. The two ends of the scissor fork telescopic rod are provided with two rods, one of the rods at the connection of the vertical scissor fork telescopic rods and the back of the backrest is fixedly connected to the back of the backrest, and the other rod is movably connected to the back of the backrest, one of the rods at the connection of the vertical scissor fork telescopic rods and the tail box on both sides is fixedly connected to the fixed column in the tail box, and the other rod is connected to the sliding positioning shaft of the one-word telescopic lifting rod arranged on the fixed column, and one of the rods at the connection of the horizontal scissor fork telescopic rod and the back of the backrest is fixedly connected to the back of the backrest, and the other rod is movably connected to the back of the backrest, one of the rods at the connection of the horizontal scissor fork telescopic rod and the tail box at the lower end is fixedly connected to the rod arranged in the tail box, and the other rod is movably connected to the rod arranged in the tail box. When the backrest is stretched or contracted, the rod of the vertical scissor fork telescopic rod movable in the back of the backrest and the rod of the scissor fork telescopic rod on the sliding positioning shaft of the one-word telescopic lifting rod on the same side are maintained on the same horizontal line, and the horizontal scissor fork telescopic rod at the lower end is only telescopic and not positioned for receiving and placing objects.

8. The expandable multi-purpose electric bicycle tail box according to claim 7, characterized in that: The second sliding limit device adopts two vertical straight telescopic lifting rods, and the maximum length of the vertical straight telescopic lifting rods is adapted to the maximum height of the tail box body.

9. The expandable multi-purpose electric vehicle bicycle tail box according to claim 7, characterized in that: The storage cover is an accordion-shaped U-shaped storage cover with an open upper end. The two ends of the storage cover are respectively connected to the back of the backrest and the trunk wall. The storage cover is placed in a U-shaped groove formed by the left and right sides between the backrest and the trunk and the lower end of the scissor-fork telescopic rod combination.

10. The expandable multi-purpose electric bicycle tail box according to claim 1, characterized in that: The front of the backrest adopts high-efficiency sponge with an arc that fits the waist. A vibrating electromagnetic massager is arranged in front of the backrest. The vibrating electromagnetic massager is connected to the power supply of the electric vehicle or bicycle. A switch for controlling the vibrating electromagnetic massager is arranged on the backrest.

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