CN114670909A

CN114670909A - Unpowered flatbed of hidden pull rod

Info

Publication number: CN114670909A
Application number: CN202210367436.9A
Authority: CN
Inventors: 刘帅; 高章健; 陈义林; 李天阳; 赵伟; 樊华; 许耸伟; 王博
Original assignee: Anhui Nanrui Zhongtian Electric Power Electronics Co ltd
Current assignee: Anhui Nanrui Zhongtian Electric Power Electronics Co ltd
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2022-06-28

Abstract

The invention belongs to the field of transport machinery, and particularly relates to a pull rod hidden type unpowered flat car. This flatbed includes: the vehicle body comprises a vehicle body flat plate, wheels, a pull rod, a sliding rail, a movable plate and a hinge piece. The sliding rail is arranged on the bottom surface of the vehicle body flat plate, the extending direction of the sliding rail is parallel to the moving direction of the flat car, and the sliding rail extends from the edge of one side of the vehicle body flat plate, on which the pull rod is arranged, to the other side of the vehicle body flat plate. The movable plate is mounted on the slide rail and can freely slide along the extending direction of the slide rail. The hinge piece is used for connecting the movable plate and the pull rod; so that the pull rod can rotate relative to the movable plate along the rotating shaft of the hinge. The unpowered flat car provided by the invention can be freely switched between the pull rod unfolding state and the pull rod folding state. In the vehicle's tie-bar folded condition, the retractable tie-bar is completely hidden under the body panel. The invention solves the problems that the structural design of the existing flat car is unreasonable, the pull rod of the flat car cannot be flexibly stored, and the flat car is difficult to use in a narrow space.

Description

Unpowered flatbed of hidden pull rod

Technical Field

The invention belongs to the field of transport machinery, and particularly relates to a pull rod hidden type unpowered flat car.

Background

An unpowered flat car is a transportation tool commonly used in the logistics industry, and the car generally comprises a flat plate for carrying goods and a fixed or foldable pull rod, wherein wheels are arranged at the bottom of the flat plate. The user can use the unpowered flat car to carry loose parts or small and light goods. The unpowered trolleys are various in forms, the structure and the installation mode of the pull rod are different, but the pull rod or the handrail of almost all unpowered flatbeds can only be folded towards the upper side of the flat bed. Therefore, the occupied space of the flat car can be reduced only when the pull rod is stored, and the pull rod cannot be stored or hidden when the pull rod is in a use state. The limitation of the folding mode leads the flat car not to be used in a narrow space. In some special use scenarios, the user may even need to detach the pull rod of the flatbed to facilitate passage through a narrow passage. But the walking direction of the flat car with the pull rod detached is difficult to control, and the difficulty is caused to the user for carrying goods.

Disclosure of Invention

The flat car aims to solve the problems that the structural design of the existing flat car is unreasonable, a pull rod of the flat car cannot be flexibly stored, and the flat car is difficult to use in a narrow space; the invention provides a pull rod hidden type unpowered flat car.

The invention is realized by adopting the following technical scheme:

the utility model provides a hidden unpowered flatbed of pull rod, this unpowered flatbed overall structure is similar with conventional product on the market, specifically includes: vehicle body panel, wheels and tie rods. In addition, the flat car of the present invention further includes: slide rail, fly leaf and articulated elements.

The sliding rail is arranged on the bottom surface of the vehicle body flat plate, the extending direction of the sliding rail is parallel to the moving direction of the flat car, and the sliding rail extends from the edge of one side of the vehicle body flat plate, on which the pull rod is arranged, to the other side of the vehicle body flat plate.

The movable plate is mounted on the slide rail and can freely slide along the extending direction of the slide rail.

The hinge piece is used for connecting the movable plate and the pull rod; and the pull rod can rotate relative to the movable plate along the rotating shaft of the hinge. The rotation range of the pull rod at least comprises an angle interval from a state parallel to a vehicle body flat plate to a state vertical to the vehicle body flat plate.

When the movable plate slides to one end of the slide rail close to the edge of the vehicle body flat plate, the rotating shaft of the hinge piece is flush with the edge of the vehicle body flat plate, so that the pull rod can rotate relative to the vehicle body flat plate. When the movable plate slides to the other end of the slide rail, the pull rod is attached to the bottom surface of the vehicle body flat plate, and the end part of the pull rod is flush with the edge of the vehicle body flat plate, so that the pull rod is completely hidden below the vehicle body flat plate.

As a further improvement of the invention, the section of the slide rail is I-shaped, two sides of the slide rail are provided with sliding grooves which are sunken inwards, and the extending direction of the sliding grooves is parallel to the extending direction of the slide rail. The movable plate is provided with a rail holding clamp which is slidably connected with the slide rail. The rail holding clamp is C-shaped and matched with the outline of the slide rail; two ends of the rail holding clamp are bent inwards and clamped at the sliding groove on the side face of the sliding rail.

Particularly, when the number of the slide rails is more than one, the slide rails are parallel to each other; at the moment, the movable plate is a strip-shaped plate, and the movable plate is perpendicular to the sliding rail in the installation state.

As a further improvement of the invention, the pull rod is a telescopic rod and comprises two loop bars and a U-shaped drawing rod. The loop bar is perpendicular to the movable plate and is rotatably connected with the two ends of the movable plate through hinge pieces. The drawing rod comprises two telescopic sections which are parallel to each other and a handle means for connecting the two telescopic sections; the telescopic section of the pull rod is inserted into the loop bar.

Besides the U-shaped structure, the pull rod can also adopt a T-shaped structure. At this moment, the pull rod is a telescopic rod and comprises a sleeve rod and a T-shaped drawing rod. The loop bar is rotatably connected on the middle section of the movable plate through a hinge piece. The drawing rod comprises a telescopic section and a handle means which are mutually vertical; the telescopic section of the pull rod is inserted into the loop bar.

As a further improvement of the invention, a first locking mechanism is arranged in the pull rod and is used for controlling the slidable relation between the pull rod and the loop rod. The first locking mechanism is actuated by a button mounted on the handle section of the pull rod. When the button is pressed down, the locking relation between the pull rod and the loop rod is released, and the pull rod and the loop rod can be pushed and pulled mutually; when the button is released, the pull rod and the loop rod are locked with each other.

As a further improvement of the invention, an elastic part is also arranged inside the loop bar. The elastic element is compressed when the extraction rod is completely inserted inside the loop rod. When the button of the pull rod is released in the compressed state of the elastic element, the pull rod and the loop rod are locked with each other. When the button is pressed down again, the locking relation between the drawing rod and the sleeve rod is released, the elastic piece resets, and the drawing rod is driven to be partially ejected out of the sleeve rod.

As a further improvement of the invention, the connecting plate is provided with a buckle head, and the bottom surface of the vehicle body flat plate is fixedly connected with an elastic buckle. The buckle head and the elastic buckle form a second locking mechanism. When the connecting plate slides to one end of the sliding rail far away from the edge of the vehicle body flat plate, the second locking mechanism just completes locking. And when the second locking mechanism is locked, when the separation pulling force borne by the buckle head and the elastic buckle is greater than a preset pulling force value, the locking state of the second locking mechanism is released.

The second locking mechanism in the present invention functions to include two points: one is used as a limiting mechanism at the end part of the guide rail. When the movable plate slides to the limit position of the end part of the guide rail, the movable plate is prevented from further moving, and derailment of the movable plate is avoided. The second is a safety lock for the accommodating state of the pull rod. When the pull rod is completely stored, the second locking mechanism is automatically locked, and when a user needs to use the pull rod, the second locking mechanism is automatically unlocked by pulling the pull rod. Wherein, based on the aforementioned requirements, the second locking mechanism of the present invention can adopt various existing spring latch products to realize the required functions.

As a further improvement of the invention, the bottom surface of the vehicle body flat plate is provided with a mounting groove, and the assembly consisting of the slide rail, the movable plate and the pull rod is just positioned in the mounting groove when being accommodated to the bottom of the vehicle body flat plate. The shape of mounting groove satisfies: in the assembly, the mounting groove can not cause the deformation action of pull rod between folding state of accomodating and the state of expanding and block, and the mounting groove that sets up takes up the area minimum on the automobile body flat board.

Adopt the mounting groove to accomodate hidden pull rod, can be so that the dull and stereotyped bottom of automobile body keeps flush. The situation that the height of a chassis of the flat car is reduced due to the fact that the pull rod is stored at the bottom of the flat car in a hidden state is avoided; thereby enabling the flat car to be used on rugged and rugged roads.

As a further improvement, the wheels are universal wheels, and the wheels on the side, close to the drawable side of the pull rod, of the flat car are provided with pedal brake pads. The brake block can be convenient for the user and brake to the flatbed car in handling, and then prevents to appear because of the goods problem that drops that the vehicle slides and cause. The purpose of stabilizing the automobile body and improving the carrying convenience is achieved.

The technical scheme provided by the invention has the following beneficial effects:

the pull rod hidden type unpowered trolley provided by the invention has two use forms, namely a conventional pull rod unfolding state and a special pull rod folding state. Under the condition that the pull rod is folded, the pull rod of the unpowered trolley is completely hidden below the trolley body. Therefore, the flat plate of the embodiment can be applied to all application scenes of the conventional trolley, and the functions that the conventional trolley cannot carry large cargos and shuttle in a narrow space can be realized.

The structural design of the hidden unpowered trolley provided by the invention accords with human engineering. The trolley has the characteristics of easiness in operation, flexibility and practicability, labor can be saved greatly in the using process of the trolley, the traction mode of the trolley is various, and the using process is flexible and light. Can effectively replace various conventional carrying tools and even large equipment of a simple forklift.

The unpowered flat car provided by the invention is also provided with various safety mechanisms and adjusting mechanisms, so that a user can lock the folded state of the car. The user can also carry out self-adaptation adjustment to the pull rod angle, the pull rod length of vehicle etc. according to actual need in utilizing dolly handling. The vehicle is safer and more convenient.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a pull rod hidden unpowered flatbed provided in embodiment 1 of the present invention in a pull rod unfolded state.

Fig. 2 is a structural schematic diagram of a bottom view angle of the unpowered flat car in a pull rod unfolding state.

Fig. 3 is a schematic structural diagram of a tie bar hidden type unpowered flatbed provided in embodiment 1 of the present invention in a tie bar folded state.

Fig. 4 is a structural schematic diagram of a bottom view angle of the unpowered flat car in a pull rod folding state.

Fig. 5 is a schematic structural diagram of a front side view of the unpowered flat car in a pull rod unfolding state.

Fig. 6 is a partial structure enlarged view of a portion a in fig. 5.

Fig. 7 is a schematic structural diagram of a U-shaped pull rod in the unpowered flat car according to embodiment 1 of the invention.

Fig. 8 is a schematic structural diagram of a T-shaped pull rod in the unpowered flat car according to embodiment 2 of the invention.

Fig. 9 is a schematic structural view of a pull rod using an elastic member mounted in embodiment 3 of the present invention.

Fig. 10 is a schematic structural view of the unpowered flat car according to embodiment 4 of the invention mounted on the second locking mechanism.

Fig. 11 is a schematic structural view of the second lock mechanism in fig. 10 in a locked state.

Fig. 12 is a schematic structural view of a vehicle body panel having a mounting groove formed in a bottom portion thereof in embodiment 5 of the present invention.

Labeled as: 1. a body panel; 2. a wheel; 3. a pull rod; 4. a movable plate; 5. a slide rail; 6. an articulation member; 7. a second locking mechanism; 11. mounting grooves; 21. a brake pad; 31. a pull rod; 32. a loop bar; 33. a button; 34. an elastic member; 41. a rail holding clamp; 51. a sliding groove; 71. elastic buckle; 72. a buckle head; 321. a telescopic section; 322. means for removing the residue.

Description of the preferred embodiment

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

The embodiment provides a pull rod 3 hidden unpowered flatbed, and the overall structure of the unpowered flatbed is similar to that of a conventional product, and the unpowered flatbed also comprises: a body panel 1, wheels 2 and tie rods 3. The structure of the flatbed in the state that the pull rods 3 are unfolded is shown in figure 1, and as can be seen from the combination of figure 1, the flatbed has basically the same structure and function as the conventional products when the pull rods 3 are unfolded. Furthermore, in conjunction with fig. 2, it can be found that: the flat cart of the present embodiment further includes, with respect to conventional products: a slide rail 5, a movable plate 4 and a hinge 6.

The slide rail 5 is installed on the bottom surface of the vehicle body flat plate 1, the extending direction of the slide rail 5 is parallel to the moving direction of the flat car, and the slide rail 5 extends from the edge of one side of the vehicle body flat plate 1 where the pull rod 3 is installed to the other side. The movable plate 4 is mounted on the slide rail 5 and can freely slide along the extending direction of the slide rail 5. The hinge 6 is used for connecting the movable plate 4 and the pull rod 3; and allows the pull rod 3 to be turned relative to the movable plate 4 along the rotation axis of the hinge 6. The range of rotation of the tie rod 3 in this embodiment includes rotation from a state parallel to the vehicle body panel 1 to a state perpendicular to the vehicle body panel 1.

The unpowered flat car provided in the embodiment has two use forms, namely a pull rod 3 unfolding state and a pull rod 3 folding state. The unfolded state of the pull rod 3 is shown in fig. 1 and 2: at this time, the movable plate 4 slides on the slide rails 5 to an end near the edge of the vehicle body panel 1, and the rotation shaft of the hinge member 6 is flush with the edge of the vehicle body panel 1. At this time, the user can turn the draw bar 3 as desired. So that the tie rod 3 is turned to a desired angle relative to the body panel 1.

The tension rod 3 is folded as shown in fig. 3 and 4: at this time, the movable plate 4 slides to the other end of the slide rail 5, and the pull rod 3 is attached to the bottom surface of the vehicle body panel 1. And in the unpowered flat car of the embodiment, when the movable plate 4 slides to the corresponding limit position, the end of the pull rod 3 is flush with the edge of the body panel 1, so that the pull rod 3 is completely hidden under the body panel 1.

The user can select to adopt different structural style according to different goods transport demands. For example, when handling small bulk goods, the extension of the tie rods 3 can be selected and used in the same way as a conventional flat car for pushing or pulling the car by holding the tie rods 3. When large goods need to be carried or narrow doors and low doors need to be passed through, if the pull rod 3 is used in the unfolded state, the pull rod 3 of the flat car may cause obstruction, which causes difficulty in the using process of a user. At this time, the user can select to deform the flatbed into the state that the pull rods 3 are folded. In this state, the flatbed corresponds to a movable platform with wheels 2, and a user can hold the vehicle body platform 1 or goods carried on the vehicle body platform to push the flatbed and the goods to move.

In this embodiment, fig. 5 is a view from the front side of the flatbed, fig. 6 is a partially enlarged view of a portion a in fig. 5, and it can be found by combining fig. 5 and fig. 6 that: the cross section of the slide rail 5 in this embodiment is i-shaped, two sides of the slide rail 5 are provided with sliding grooves 51 which are recessed inwards, and the extending direction of the sliding grooves 51 is parallel to the extending direction of the slide rail 5.

Wherein, a rail holding clamp 41 for slidably connecting with the sliding rail 5 is arranged in the movable plate 4. The rail holding clamp 41 is in a C shape and is matched with the outline of the slide rail 5. Two ends of the rail holding clamp 41 are provided with bending parts which are bent inwards. When the rail holding clamp 41 is installed, the rail holding clamp is clamped on the sliding rail 5, and the bent part of the rail holding clamp 41 is just clamped in the sliding groove 51 on the side surface of the sliding rail 5. In this mounted state, the movable plate 4 can only translate relative to the slide rails 5 along the extension direction of the slide rails 5.

The sliding rail 5 in this embodiment is used to limit the moving direction and the moving track of the assembly formed by the movable plate 4 and the pull rod 3. Besides the structure of the sliding rail 5 provided by the present embodiment, other different types of sliding rails 5 can be adopted in other embodiments, and corresponding rail connectors are installed on the movable plate 4. As long as it is satisfied that the slide rail 5 can control the movable plate 4 to move according to the same trajectory as the present embodiment.

In the unpowered flat car provided in this embodiment, the number of the slide rails 5 is not limited. The smaller the number of slide rails 5, the simpler the structure of the flat car and the lower the production and manufacturing costs. But when two are no less than to slide rail 5 quantity, then can produce better structural stability for the slip process of fly leaf 4 is more steady, smooth and easy.

For example, after two mutually parallel slide rails 5 are adopted as in the present embodiment, a long strip-shaped plate can be used as the movable plate 4, and the movable plate 4 is mounted on the two slide rails 5 in a "straddling" manner. At this time, when the movable plate 4 moves along the slide rails 5, the lateral shift of the movable plate 4 is suppressed by the two slide rails 5. Even if the pull rod 3 is applied with a lateral force, the pull rod cannot be laterally deviated relative to the sliding rail 5. This not only makes the moving process of movable plate 4 more smooth and easy, also can avoid slide rail 5 and embrace rail anchor clamps 41 atress deformation or damage in the moving process, has improved the life of structures such as movable plate 4 and slide rail 5.

The pull rod 3 used in this embodiment is a telescopic rod. Specifically, as shown in fig. 7, the pull rod 3 includes two loop rods 32 and a U-shaped pull rod 31. The loop bars 32 are installed perpendicular to the movable plate 4, and the two loop bars 32 are respectively and rotatably connected with the two ends of the movable plate 4 through the hinge members 6. The pull rod 31 comprises two telescopic sections 321 which are parallel to each other, and a handle section 322 which connects the two telescopic sections 321; the telescopic section 321 of the pull rod 31 is inserted into the loop rod 32.

In addition, a first locking mechanism is further disposed inside the pull rod 3 of this embodiment, and the first locking mechanism is used for controlling the slidable relationship between the pull rod 31 and the loop rod 32. The first locking mechanism is actuated by a push button 33 mounted on the handle section 322 of the pull rod 31. When the button 33 is pressed, the locking relationship between the pull rod 31 and the loop rod 32 is released, and the two can be pushed and pulled each other. When the button 33 is released, the pull rod 31 and the loop rod 32 are locked with each other. The user applies a force to the withdrawing rod 31, and the withdrawing rod 31 is not fed to the inside of the pocket bar 32.

The structure of the U-shaped drawbar 3 in the present embodiment is similar to that of the drawbar 3 in the conventional trunk, and the drawbar 3 is designed to be a multi-section telescopic structure, and the telescopic state between the sections of the drawbar 3 is adjusted by a corresponding locking mechanism.

The length of the pull rod 3 can be changed in use by using the telescopic pull rod 3; the unpowered flat car is convenient for users with different body heights to use. Meanwhile, after the telescopic pull rod 3 is used, a user can further reduce the volume of the pull rod 3 when the unpowered flat car is in a folded state of the pull rod 3, so that the pull rod 3 can be hidden below the car body flat plate 1 completely.

In the present embodiment, the deformation process of the unpowered flat car between different forms is as follows:

(1) when the need arises to switch from the collapsed state of the draw bar 3 to the extended state of the draw bar 3: a user can extend a hand below the flat plate, hold the pulling means of the pull rod 3, and then apply pulling force to the direction parallel to the slide rail 5 to pull the movable plate 4 to be flush with the edge of the vehicle body flat plate 1; the tie rod 3 is then turned upwards so that the tie rod 3 is erected. The user can also extend the length of the pull rod 3 according to the requirement and change the included angle between the pull rod 3 and the plane of the vehicle body flat plate 1.

(2) When the need arises to switch from the state of unfolding the tie rod 3 to the state of folding the tie rod 3: the user should first compress the drawbar 3 to the shortest state; then the pull rod 3 is turned to be parallel to the vehicle body flat plate 1; finally the pull rod 3 is pushed inwards until the movable plate 4 slides to the limit position inside the slide rail 5. At this time, the end of the tie rod 3 is flush with the vehicle body panel 1. The tie rods 3 are completely hidden to the bottom of the body panel 1.

In the unpowered flat car of the embodiment, the wheels 2 connected below the car body flat plate 1 are universal wheels; so that the vehicle body flat plate 1 can move towards any direction, and the flexibility of the flat car is improved. Meanwhile, in the embodiment, a pedal brake pad 21 is also arranged on the wheel 2 close to the side, where the pull rod 3 can be drawn out, of the flat car. The user can utilize brake block 21 to brake the flatbed at the flatbed parking stage, avoids the flatbed to slide at will and causes the goods to topple over, and then produces the personal or loss of property.

It should be noted that the pull rod 3 and the movable plate 4 in this embodiment are connected by a hinge. The hinge member is a conventional hinge type hinge. In other more preferred embodiments, however, the hinge member 6 may also be a damped hinge with damping and self-locking properties. After the damping hinge is used, when the user turns the pull rod 3 to any angle, the pull rod 3 can automatically keep the turning state until the user applies force to the pull rod 3 to force the pull rod 3 to turn further. The damping hinge can prevent the pull rod 3 from falling to the ground in a non-use state; the service life of the hinge structure of the pull rod 3 and the movable plate 4 is prolonged; and be convenient for more the user uses the flatbed, promoted the user experience of this product.

Example 2

The embodiment provides a pull rod 3 hidden unpowered flat car. This example differs from example 1 in that: in this embodiment, the number of the slide rails 5 is one. Accordingly, the movable plate 4 of the present embodiment has a block shape, and the pull rod 3 of the present embodiment does not have a U-shaped structure as in the present embodiment, but has a T-shaped structure as shown in fig. 8.

The T-shaped pull rod 3 in this embodiment is also a telescopic rod, and the T-shaped pull rod 3 includes a loop bar 32 and a T-shaped pull rod 31. The loop bar 32 is rotatably connected to the movable plate 4 by the hinge 6. The pull rod 31 comprises a telescopic section 321 and a handle section 322 which are perpendicular to each other; the telescopic section 321 of the pull rod 31 is inserted into the loop rod 32. As in embodiment 1, the T-shaped pull rod 3 of this embodiment is also provided with a corresponding first locking mechanism, so that the pull rod 31 and the loop rod 32 of the pull rod 3 can be controllably adjusted in a push-pull manner under the control of the button 33.

Compared with the pull rod 3 in the embodiment 1, the unpowered flat car in the embodiment further has the following advantages compared with the product in the embodiment 1:

(1) in the embodiment, only one sliding rail 5 is required to be installed, and the structure of the pull rod 3 is simpler; the production and manufacturing cost of the product is lower; the flat car is very suitable for being used for modifying and installing the existing flat car.

(2) The volume of the pull rod 3 in the embodiment is smaller, and a movable plate 4 with smaller volume can be used; the assembly composed of the pull rod 3, the movable plate 4 and the slide rail 5 occupies a smaller space in the storage state, so that the hidden storage of the pull rod, the movable plate and the slide rail is very convenient.

The pull rod 3 belongs to a traction mechanism in the unpowered flat car, and when the U-shaped pull rod 3 in the embodiment 1 is used, the pull rod 3 can only be turned up and down relative to the car body flat car 1, namely, only one degree of freedom of movement is provided between the pull rod 3 and the car body. After the T-shaped pull rod 3 is used in the embodiment, the structure between the pull rod 3 and the movable plate 4 of the hidden unpowered flat car can be further upgraded to a structure with two degrees of freedom.

For example, in the present embodiment, a revolute pair with two degrees of freedom is further used to connect the T-shaped link 3 and the movable plate 4. Further, the T-shaped tie bar 3 can be turned over up and down with respect to the vehicle body panel 1, and the function of unfolding or folding and storing the tie bar 3 as described above is realized. Meanwhile, the pull rod 3 can also horizontally rotate left and right relative to the vehicle body flat plate 1, so that a user can conveniently adjust the motion direction of the flat car by rotating the pull rod 3 in the using process, and the flexibility of the flat car is further improved. In the structure of this embodiment, the adjustment process that turns to of flatbed is more laborsaving, and the motion trail when turning to is also more level and smooth and easy. Therefore, the goods loaded on the body panel 1 are more stable during the transportation process and are not easy to overturn due to inertia effect during the steering process.

Example 3

The embodiment provides a pull rod 3 hidden unpowered flat car. The difference between the flat car and the products of the previous embodiments is that:

the loop bar 32 of the embodiment is also internally provided with an elastic part 34; the resilient member 34 is a return mechanism. As shown in fig. 9, the elastic member 34 is installed at the bottom of the loop bar 32, and thus, when the withdrawing bar 31 is completely inserted into the interior of the loop bar 32, the elastic member 34 is compressed. When the elastic element 34 is in a compressed state, if the button 33 on the pull rod 31 is released, the pull rod 31 and the loop bar 32 are locked with each other, and the elastic element 34 is always in a compressed state.

However, in the compressed state of the elastic member 34, if the push button 33 is pushed down again, the locking relationship between the pull rod 31 and the loop rod 32 is automatically released (function of the first locking mechanism); the elastic member 34 in the compressed and deformed state is automatically restored to drive the drawing rod 31 to be partially ejected from the loop bar 32.

The purposes of providing the elastic reset mechanism in the embodiment include the following two points:

firstly, the automatic resetting effect of the elastic element 34 after compression deformation can enable the telescopic pull rod 3 to have the popping function, so that a user can conveniently pull out the pull rod 3 by filling the bottom of the vehicle body flat plate 1.

When the flatbed in the foregoing embodiment is in the folded state of the pull rod 3, the pull rod 3 is hidden under the vehicle body flatbed 1. Therefore, when the floor space of the body panel 1 of the flat car is small or the floor surface is rough in use, the gap between the floor and the floor surface may not allow the user's hand to reach the underbody and draw out the tie rods 3. Therefore, the purpose of changing the form of the unpowered flat car according to a specific use scene cannot be achieved.

However, after using the improved solution of the present embodiment, when the user cannot extend the hand into the bottom of the vehicle body panel 1 to draw out the pull rod 3, the user can also first press the button 33 in the handle section 322 of the pull rod 31, so that the pull rod 31 is automatically and partially ejected from the loop bar 32 (the ejection distance depends on the deformation degree of the installed elastic element 34). At this time, the user can hold the lever 3 ejected out of the body panel 1 by the means 322 and then pull out the lever 3 as a whole.

Secondly, the automatic resetting effect of the elastic part 34 after compression deformation can enable the telescopic pull rod 3 to have the popping function, and then a user can conveniently control the movement of the flat car in the folding state of the pull rod 3.

In some special use scenarios, the user needs to transform the flatbed into the folded state of the pull rod 3. In this state the platform car corresponds to a pallet with wheels 2 at the bottom. This particular configuration is very suitable for handling large items of cargo (in the unfolded state of the tie rods 3, the tie rods 3 limit the volume of the cargo loaded on the platform truck). Meanwhile, the structure is also very suitable for transporting goods through narrow doors or low doors (in the unfolded state of the pull rod 3, the pull rod 3 blocks the flat car from passing through a narrow space). However, in the folded state of the pull rod 3, it is difficult for the user to control the direction of the transported goods (the pull rod 3 is used as a traction mechanism, and the user can control the direction of the motion path of the flat car). Meanwhile, a user can hardly hold the flat car and keep the motion state of the flat car stable.

However, after adopting the improved technical solution provided by this embodiment, when the user carries goods in the folded state of the pull rod 3, the user can also push the pull rod 3 partially by pressing the button 33, the pushed part serves as a direction control handle for the flatbed, and the user can hold the handle to stabilize the unpowered flatbed and control the moving direction of the flatbed, and at this time, the pushed part serves as an auxiliary traction mechanism for the flatbed.

Example 4

as shown in fig. 10, the connection plate of the present embodiment is provided with a snap head 72, and an elastic snap 71 is fixedly connected to the bottom surface of the vehicle body panel 1. The snap head 72 and the elastic snap 71 constitute the second locking mechanism 7 as shown in fig. 11. The second locking mechanism 7 is locked exactly when the web slides to the end of the slide rail 5 remote from the edge of the body panel 1. And when the second locking mechanism 7 is locked, when the separation pulling force applied to the snap head 72 and the elastic snap 71 is larger than a preset pulling force value, the locking state of the second locking mechanism 7 is released.

The functions of the second locking mechanism 7 in the present embodiment include the following two points: one is as the stop gear of guide rail tip, derails when preventing fly leaf 4 to slide rail 5 tip. And the second is a safety lock for preventing the pull rod 3 from sliding out when the flat car is in the state that the pull rod 3 is folded.

In this embodiment, the sliding rail 5 and the movable plate 4 are movably connected by a rail holding clamp 41. The rail holding clamp 41 with such a structure can be sleeved on the slide rail 5 only through one end of the slide rail 5, so that the slide groove 51 in the slide rail 5 is through at least one end of the slide rail 5. In the unpowered flat plate of the present embodiment, the slide groove 51 in the slide rail 5 is penetrated at an end away from the edge of the vehicle body panel 1, from which the movable plate 4 is mounted to the slide rail 5. In order to prevent the flap 4 from derailing from the end of the slide rail 5 when sliding, the present embodiment has an elastic catch 71 mounted on the bottom of the body panel 1 near the limit position of the flap 4. When the movable plate 4 slides to the limit position on the slide rail 5, the movable plate is blocked by the elastic buckle 71 and cannot slide further, so that the derailment risk of the movable plate 4 is eliminated.

Meanwhile, the elastic buckle 71 and the buckle head 72 installed at the corresponding position of the movable plate 4 constitute a second locking mechanism 7. As can be seen from fig. 10, when the flap 4 is moved to the end of the slide rail 5 and the pull rod 3 is completely hidden under the vehicle body panel 1, two components in the second locking mechanism 7 are just contacted and automatically locked. When a user needs to switch the flat car from the folding state of the pull rod 3 to the unfolding state of the pull rod 3, the user only needs to pull the pull rod 3 outwards with force, and when the pulling force of the user is larger than the unlocking force of the second locking mechanism 7, the second locking mechanism 7 can be unlocked automatically.

The second locking mechanism 7 in this embodiment is a conventional spring latch product. Under the condition of meeting the design target conditions of automatic locking, pulling unlocking and derailment prevention of the movable plate 4 in the design of the scheme of the embodiment. The second locking mechanism 7 can also adopt any products such as an elastic door stopper, a magnetic lock and the like.

Example 5

as shown in fig. 12, the bottom surface of the body panel 1 of the unpowered flat car of the present embodiment is provided with a mounting groove 11. In the folded state of the pull rod 3, the assembly of the slide rail 5, the movable plate 4 and the pull rod 3 is accommodated in the mounting groove 11 at the bottom of the vehicle body panel 1. After the installation groove 11 is arranged, the pull rod 3 only enters and exits along the installation groove 11. This allows the body panel 1 to remain flush when the tie rods 3 are folded. When the pull rod 3 in the flat car is stored at the bottom of the car body flat plate 1, the chassis of the flat car is not lowered. Therefore, the unpowered flat car of the embodiment can be suitable for various complicated use environments, and when the unpowered flat car is used on a rugged road, the pull rod 3 is not easy to have the fault of scraping the ground.

The vehicle body panel 1 having the mounting groove 11 can be manufactured by various processing methods such as injection molding, three-dimensional printing, machining, and the like. Can be integrally formed or assembled by module combination. The structural design of the mounting groove 11 depends on the structural style and the mounting relationship of the traction mechanism composed of the pull rod 3, the slide rail 5 and the movable plate 4. The shapes of the mounting grooves 11 corresponding to the traction mechanisms with different structures are different.

Considering that the local structural strength of the vehicle body panel 1 may be reduced after the installation groove 11 is opened, the installation groove 11 of the present embodiment should be designed in advance according to the structures and the movement traces of the pull rod 3, the slide rail 5 and the movable plate 4, and the shape of the installation groove 11 should satisfy: the installation groove 11 can not block the form change process of a traction mechanism consisting of the pull rod 3, the movable plate 4 and the slide rail 5; and the occupied area of the arranged installation groove 11 on the vehicle body flat plate 1 is the minimum. In particular, in other embodiments, a reinforcing rib may be designed in the opened installation groove 11 to partially reinforce the structure of the vehicle body panel 1.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a hidden unpowered flatbed of pull rod, its includes that the automobile body is dull and stereotyped, wheel and pull rod, its characterized in that: the flatbed still includes:

the sliding rail is arranged on the bottom surface of the vehicle body flat plate, the extending direction of the sliding rail is parallel to the moving direction of the flat car, and the sliding rail extends from the edge of one side of the vehicle body flat plate, on which the pull rod is arranged, to the other side;

the movable plate is arranged on the slide rail and can freely slide along the extending direction of the slide rail; and

the hinge is used for connecting the movable plate and the pull rod, and the pull rod can rotate relative to the movable plate along a rotating shaft of the hinge; the rotation range of the pull rod at least comprises an angle interval from a state parallel to a vehicle body flat plate to a state vertical to the vehicle body flat plate;

when the movable plate slides to one end of the slide rail close to the edge of the vehicle body flat plate, the rotating shaft of the hinge joint is flush with the edge of the vehicle body flat plate, so that the pull rod can rotate relative to the vehicle body flat plate; when the movable plate slides to the other end of the slide rail, the pull rod is attached to the bottom surface of the vehicle body flat plate, and the end part of the pull rod is flush with the edge of the vehicle body flat plate, so that the pull rod is completely hidden below the vehicle body flat plate.

2. The tie-bar concealed unpowered flat car of claim 1, wherein: the section of the sliding rail is I-shaped, two sides of the sliding rail are provided with sliding grooves which are sunken inwards, and the extending direction of the sliding grooves is parallel to the extending direction of the sliding rail; a rail holding clamp which is used for being slidably connected with the sliding rail is arranged in the movable plate; the rail holding clamp is C-shaped and matched with the outline of the slide rail; two ends of the rail holding clamp are bent inwards and clamped at the sliding groove on the side surface of the sliding rail in a holding manner;

when the number of the slide rails is more than one, all the slide rails are parallel to each other; at the moment, the movable plate is a strip-shaped plate, and in the installation state, the movable plate is perpendicular to the sliding rail.

3. The tie-bar concealed unpowered flat car according to claim 2, wherein: the pull rod is a telescopic rod and comprises two sleeve rods and a U-shaped pull rod; the loop bar is perpendicular to the movable plate and is rotatably connected with two ends of the movable plate through hinge pieces; the drawing rod comprises two telescopic sections which are parallel to each other and a handle means for connecting the two telescopic sections; the telescopic section of the pull rod is inserted into the loop bar.

4. The tie-bar concealed unpowered flat car according to claim 2, wherein: the pull rod is a telescopic rod and comprises a sleeve rod and a T-shaped pull rod; the loop bar is rotatably connected to the middle section of the movable plate through a hinge; the drawing rod comprises mutually vertical telescopic sections and a handle means; the telescopic section of the pull rod is inserted into the loop bar.

5. The pull rod concealed unpowered flat car according to claim 3 or 4, wherein: a first locking mechanism is arranged in the pull rod and used for controlling the slidable relation between the pull rod and the sleeve rod; the first locking mechanism is driven by a button arranged on the handle section of the pull rod; when the button is pressed down, the locking relation between the pull rod and the loop rod is released, and the pull rod and the loop rod can be pushed and pulled mutually; when the button is released, the pull rod and the loop rod are locked with each other.

6. The tie-bar concealed unpowered flat car of claim 5, wherein: the sleeve rod is internally provided with an elastic piece for controlling the pull rod to pop out; the elastic piece is compressed when the drawing rod is completely inserted into the loop bar; under the compression state of the elastic piece, when the button of the pull rod is released, the pull rod and the loop bar are mutually locked; when the button is pressed down again, the locking relation between the pull rod and the sleeve rod is released, the elastic piece resets, and the pull rod is driven to be partially ejected out of the sleeve rod.

7. The tie-bar concealed unpowered flat car of claim 6, wherein: the connecting plate is provided with a buckle head, and the bottom surface of the vehicle body flat plate is fixedly connected with an elastic buckle; the buckle head and the elastic buckle form a second locking mechanism; when the connecting plate slides to one end, far away from the edge of the vehicle body flat plate, of the slide rail, the second locking mechanism just completes locking; and when the second locking mechanism is locked, when the separation pulling force applied to the buckle head and the elastic buckle is greater than a preset pulling force value, the locking state of the second locking mechanism is released.

8. The tie-bar concealed unpowered flat car of claim 7, wherein: the second locking mechanism is a spring latch.

9. The tie-bar concealed unpowered flat car of claim 1, wherein: the bottom surface of the vehicle body flat plate is provided with a mounting groove, and a combined body formed by the slide rail, the movable plate and the pull rod is just positioned in the mounting groove when being accommodated to the bottom of the vehicle body flat plate; the shape of the mounting groove satisfies: in the assembly, there is no interference between the mounting groove and the pull rod in the deformation action process between the folding and accommodating state and the unfolding state, and the occupied area of the mounting groove on the vehicle body flat plate is minimum.

10. The tie-bar concealed unpowered flat car of claim 1, wherein: the wheels are universal wheels, and the wheels close to one side, from which the pull rod can be drawn out, of the flat car are provided with pedal brake pads.