Folding trolley with chassis capable of being self-locked

Abstract

The utility model provides a folding trolley with a self-locking chassis, which comprises a chassis component, the chassis component is provided with a support base positioned at the center position and a plurality of connecting rods, the end parts of the connecting rods are hinged on the support base, and a locking mechanism is mounted between at least one connecting rod and the support base. The locking mechanism is used for locking the underframe assembly to prevent the underframe assembly from being folded; the locking mechanism comprises a telescopic lock head which is installed at the end of the connecting rod in a sliding mode, and an unlocking piece matched with the telescopic lock head is hinged to the supporting base. During unlocking, the unlocking piece rotates, the unlocking piece pushes the telescopic lock head to retract into the connecting rod, and therefore the connecting rod can rotate relative to the supporting base. The folding trolley with the chassis capable of being self-locked overcomes the defect that the chassis of an existing folding trolley cannot be locked.

Description

Technical Field

[0001] The utility model relates to the field of foldable trolleys, in particular to a foldable trolley with a self-locking bottom frame. Background Art

[0002] With the improvement of living standards, more and more people like to drive to outdoor activities, and they will carry a lot of picnic food and outdoor equipment when driving. However, the car can generally only be driven to the parking place, and the remaining distance mostly needs to be completed on foot. It is very inconvenient for people to carry so many things for outdoor hiking. Now, trolleys that can be folded and placed in the trunk are also sold on the market. When in use, the trolley can be opened to carry picnic food and outdoor equipment, which is convenient for people to carry.

[0003] For example, patent authorization announcement number CN220594925U discloses a foldable anti-pinch trolley, whose bottom frame includes a center seat, four bottom rods hinged to the center seat at one end, and a support rod, and the other end of the bottom rod is hinged to the corresponding support column; when folding, the center seat is lifted upward, and the four bottom rods drive the four support columns to fold toward the middle, and drive the X-shaped folding frame to fold and fold. In the above structure, there is no locking structure on the center seat of the bottom frame, and the bottom frame cannot be locked, the frame stability is poor, it is easy to shake, and the use effect is poor. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] The problem to be solved by the utility model is to provide a foldable trolley with a self-locking bottom frame, so as to overcome the defect that the bottom frame of the existing foldable trolley cannot be locked.

[0006] (II) Technical solution

[0007] In order to solve the technical problem, the utility model provides a folding trolley with a self-locking base, including a base assembly, the base assembly having a supporting base in a central position and a plurality of connecting rods hinged at their ends on the supporting base, a locking mechanism being installed between at least one connecting rod and the supporting base, the locking mechanism being used to lock the base assembly to prevent it from folding; the locking mechanism comprising a telescopic lock head slidably installed at the end of the connecting rod, an unlocking member hinged on the supporting base for cooperating with the telescopic lock head; when unlocking, the unlocking member rotates, and the unlocking member pushes the telescopic lock head back into the connecting rod, so that the connecting rod can rotate relative to the supporting base.

[0008] In some embodiments, a cylindrical hinged cylinder is provided on the unlocking member, and a driving block is provided on one side of the cylindrical hinged cylinder; a locking tongue is provided at the end of the telescopic lock head, and when locked, the locking tongue is abutted against the lower side of the cylindrical hinged cylinder, and when unlocked, the locking tongue is pushed back into the connecting rod by the driving block.

[0009] In some embodiments, the connecting rod is hinged to the supporting base via a first hinge shaft, and the telescopic lock is provided with a waist-shaped groove adapted to the first hinge shaft.

[0010] In some embodiments, a limit rod is fixed inside the connecting rod, and a spring is installed between the limit rod and the telescopic lock head, and the spring always makes the telescopic lock head tend to move toward the unlocking member. A receiving groove for receiving the spring is provided inside the telescopic lock head, and the limit rod is placed in the receiving groove; a spring limit protrusion is provided on one side of the receiving groove away from the limit rod, and one end of the spring abuts against the limit rod, and the other end is sleeved on the spring limit protrusion.

[0011] In some embodiments, the unlocking member is L-shaped, and a pulling portion is provided at one end thereof away from the cylindrical hinge cylinder; a through hole is provided on the pulling portion, a fixing rod is provided in the through hole, and a pull strap is passed through the fixing rod.

[0012] In some embodiments, there are four connecting rods arranged in an X shape, and a locking mechanism is installed between two opposite connecting rods and the support base.

[0013] In some embodiments, four supporting columns are arranged in a rectangular shape, and one end of the connecting rod away from the supporting base is hinged on the corresponding supporting column; two adjacent supporting columns are connected by an X-shaped folding side frame, and the two sides of the upper end of the X-shaped folding side frame are respectively hinged to the corresponding supporting columns, and the two sides of the lower end are respectively slidingly hinged to the corresponding supporting columns.

[0014] In some embodiments, a handle assembly is installed between any two supporting columns, and a supporting beam is installed between the bottoms of the two supporting columns, and the supporting beam is arranged opposite to the handle assembly; the supporting beam includes a connecting seat and a parallelogram rod group symmetrically arranged on both sides of the connecting seat, and the parallelogram rod group includes an upper support rod and a lower support rod arranged in parallel and staggered manner, the upper support rod and the lower support rod have the same length, and the upper support rod is located on the upper side of the lower support rod; one end of the upper support rod and the lower support rod is hinged to the corresponding supporting column, and the other end is hinged to the connecting seat.

[0015] In some embodiments, an X-shaped extension frame that can be expanded outward is installed between two supporting columns, and the two sides of the lower end of the X-shaped extension frame are respectively hinged to the corresponding supporting columns; a U-shaped frame is installed between the two supporting columns, and the two sides of the U-shaped frame are respectively hinged to the corresponding supporting columns; the X-shaped extension frame, the U-shaped frame and the supporting beam are located on the same side.

[0016] (III) Beneficial effects

[0017] The utility model provides a foldable trolley with a self-locking bottom frame, which is additionally provided with a locking mechanism. The bottom frame assembly can be locked by cooperating with a telescopic lock head and an unlocking piece when unfolded for use, so that the frame will not shake and the structure is more stable and reliable. When it is necessary to fold, the drawstring can be pulled upwards, the drawstring drives the unlocking piece to rotate, and the unlocking piece pushes the telescopic lock head to retract into the connecting rod, so that the connecting rod can rotate relative to the supporting base. The utility model is simple to operate and easy to unlock. The defect that the bottom frame of the existing foldable trolley cannot be locked is overcome. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a three-dimensional diagram of a foldable trolley with a self-locking bottom frame according to the utility model;

[0020] Figure 2 A three-dimensional diagram of the connection between a supporting crossbeam, an X-shaped extension frame, a U-shaped frame and a supporting column of a folding trolley with a self-locking bottom frame according to the utility model;

[0021] Figure 3 This is a schematic structural diagram of a folding trolley with a self-locking bottom frame, which is a connection between a supporting crossbeam, an X-shaped extension frame, a U-shaped frame and a supporting column of the utility model;

[0022] Figure 4 It is a three-dimensional diagram of a folding trolley chassis assembly with a self-locking chassis according to the utility model;

[0023] Figure 5 It is a cutaway view of a foldable trolley chassis assembly with a self-locking chassis according to the utility model;

[0024] Figure 6 This is a structural schematic diagram of a folding trolley with a self-locking bottom frame when the bottom frame assembly is locked;

[0025] Figure 7This is a three-dimensional diagram of a telescopic lock of a folding trolley with a self-locking bottom frame according to the utility model;

[0026] Figure 8 It is a three-dimensional diagram of an unlocking member of a folding trolley with a self-locking bottom frame according to the utility model;

[0027] The names of the components corresponding to the various figure marks in the figure are: 1. Base frame assembly; 11. Support base; 12. Connecting rod; 13. First hinge axis; 14. Limit rod; 21. Telescopic lock; 22. Unlocking member; 23. Spring; 25. Pull belt; 211. Lock tongue; 212. Waist-shaped groove; 213. Accommodating groove; 214. Spring limiting protrusion; 221. Columnar hinge cylinder; 222. Driving block; 223. Perforation; 224. Fixing rod; 3. Support column; 4. X-shaped folding side frame; 5. Handle assembly; 6. Support beam; 61. Connecting seat; 62. Parallelogram rod group; 621. Upper support rod; 622. Lower support rod; 7. X-shaped extension frame; 8. U-shaped frame. DETAILED DESCRIPTION

[0028] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0030] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0031] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0032] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0033] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0034] See also Figures 1 to 8 The utility model provides a folding trolley with a self-locking chassis, comprising a chassis assembly 1, wherein the chassis assembly 1 has a support base 11 at a central position and a plurality of connecting rods 12 whose ends are hinged on the support base 11, and the connecting rods 12 can rotate relative to the support base 11. A locking mechanism is installed between at least one connecting rod 12 and the support base 11, and the locking mechanism is used to lock the chassis assembly 1 to prevent it from folding. The locking mechanism includes a telescopic lock head 21 slidably installed at the end of the connecting rod 12, and the telescopic lock head 21 is placed inside the connecting rod 12, and the connecting rod 12 is a hollow tube. An unlocking member 22 that cooperates with the telescopic lock head 21 is hinged on the support base 11; when unlocking, the unlocking member 22 rotates, and the unlocking member 22 pushes the telescopic lock head 21 to retract into the connecting rod 12, so that the connecting rod 12 can rotate relative to the support base 11.

[0035] In some embodiments, Figure 5 and Figure 6 As shown, the unlocking member 22 is provided with a cylindrical hinged cylinder 221, which is hinged to the support base 11 through a second hinge shaft, and the unlocking member 22 can rotate around the second hinge shaft, and a driving block 222 is provided on one side of the cylindrical hinged cylinder 221. A locking tongue 211 is provided at the end of the telescopic lock head 21, and when locked, the locking tongue 211 abuts against the lower side of the cylindrical hinged cylinder 221, and at this time, the connecting rod 12 is restricted from rotating relative to the support base 11. When unlocking, the locking tongue 211 is pushed back into the connecting rod 12 by the driving block 222, and at this time, the connecting rod 12 can rotate relative to the support base 11.

[0036] In some embodiments, Figure 4 , Figure 5 and Figure 7As shown, the connecting rod 12 is hinged to the supporting base 11 through the first hinge shaft 13, and the connecting rod 12 can rotate around the first hinge shaft 13. The telescopic lock head 21 is provided with a waist-shaped groove 212 adapted to the first hinge shaft 13, and the first hinge shaft 13 is passed through the waist-shaped groove 212 to ensure that the telescopic lock head 21 can slide in the connecting rod 12.

[0037] In some embodiments, Figure 4 , Figure 5 and Figure 7 As shown, a limiting rod 14 is fixed in the connecting rod 12, and a spring 23 is installed between the limiting rod 14 and the telescopic lock head 21, and the spring 23 always makes the telescopic lock head 21 have a tendency to move toward the unlocking member 22. A receiving groove 213 for receiving the spring 23 is provided in the telescopic lock head 21, and the limiting rod 14 is placed in the receiving groove 213; a spring limiting protrusion 214 is provided on the side of the receiving groove 213 away from the limiting rod 14, one end of the spring 23 is against the limiting rod 14, and the other end is sleeved on the spring limiting protrusion 214.

[0038] In some embodiments, Figure 4 , Figure 5 and Figure 8 As shown, the unlocking member 22 is L-shaped, and a pulling portion is provided at one end of the unlocking member 22 away from the cylindrical hinge tube 221; the pulling portion is provided with a through hole 223, a fixing rod 224 is provided in the through hole 223, and a drawstring 25 is passed through the fixing rod 224. When unlocking, the drawstring 25 is pulled upward, and the drawstring 25 drives the unlocking member 22 to rotate, so that the unlocking member 22 pushes the telescopic lock head 21 to retract and unlock, and at the same time of unlocking, the drawstring 25 drives the supporting base 11 to move upward, so that the bottom frame assembly is folded.

[0039] In some embodiments, Figure 4 As shown, there are four connecting rods 12 arranged in an X shape, and locking mechanisms are installed between two opposite connecting rods 12 and the support base 11. In this structure, locking mechanisms are arranged at two opposite connecting rods 12, and the locking effect is better.

[0040] In some embodiments, Figure 1 As shown, it also includes four support columns 3 arranged in a rectangular shape, and casters are installed at the bottom of each support column 3. One end of the connecting rod 12 away from the support base 11 is hinged on the corresponding support column 3; two adjacent support columns 3 are connected by an X-shaped folding side frame 4, and the upper ends of the X-shaped folding side frame 4 are respectively hinged to the corresponding support columns 3, and the lower ends of the X-shaped folding side frame 4 are respectively slidably hinged to the corresponding support columns 3. Among them, the X-shaped folding side frame is a prior art and will not be repeated in this embodiment.

[0041] In some embodiments, Figures 1 to 3As shown, a handle assembly 5 is installed between any two support columns 3. The handle assembly 5 is a prior art and will not be described in detail in this embodiment. A support beam 6 is installed between the bottoms of the two support columns 3. The support beam 6 is arranged opposite to the handle assembly 5; the support beam 6 includes a connecting seat 61 and a parallelogram rod group 62 symmetrically arranged on both sides of the connecting seat 61. The parallelogram rod group 62 includes an upper support rod 621 and a lower support rod 622 that are arranged in parallel and staggered. The upper support rod 621 and the lower support rod 622 have the same length, and the upper support rod 621 is located on the upper side of the lower support rod 622; one end of the upper support rod 621 and the lower support rod 622 is hinged to the corresponding support column 3, and the other end is hinged to the connecting seat 61. The use of the support beam 6 can improve the load-bearing effect, with a larger load-bearing capacity and a better use effect.

[0042] In some embodiments, Figures 1 to 3 As shown, an X-shaped stretching frame 7 that can be expanded outward is installed between the two supporting columns 3, and the two sides of the lower end of the X-shaped stretching frame 7 are respectively hinged to the corresponding supporting columns 3; a U-shaped frame 8 is installed between the two supporting columns 3, and the two sides of the U-shaped frame 8 are respectively hinged to the corresponding supporting columns 3; the X-shaped stretching frame 7, the U-shaped frame 8 and the supporting beam 6 are located on the same side.

[0043] The same and similar parts between the various embodiments in this specification can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0044] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A foldable trolley with a self-locking chassis, comprising a chassis assembly (1), wherein the chassis assembly (1) has a support base (11) at a central position and a plurality of connecting rods (12) whose ends are hinged to the support base (11), characterized in that: A locking mechanism is installed between at least one connecting rod (12) and the support base (11), and the locking mechanism is used to lock the base frame assembly (1) to prevent it from folding; the locking mechanism includes a telescopic lock (21) slidably installed at the end of the connecting rod (12), and an unlocking member (22) that cooperates with the telescopic lock (21) is hinged on the support base (11); when unlocking, the unlocking member (22) rotates, and the unlocking member (22) pushes the telescopic lock (21) to retract into the connecting rod (12), so that the connecting rod (12) can rotate relative to the support base (11).

2. The foldable trolley with a self-locking bottom frame as claimed in claim 1, characterized in that: The unlocking member (22) is provided with a cylindrical hinged cylinder (221), and a driving block (222) is provided on one side of the cylindrical hinged cylinder (221); a locking tongue (211) is provided at the end of the telescopic lock head (21); when locked, the locking tongue (211) abuts against the lower side of the cylindrical hinged cylinder (221); when unlocked, the locking tongue (211) is pushed by the driving block (222) to retract into the connecting rod (12).

3. The foldable trolley with a self-locking bottom frame as claimed in claim 1, characterized in that: The connecting rod (12) is hinged to the supporting base (11) via a first hinge shaft (13), and the telescopic lock head (21) is provided with a waist-shaped groove (212) adapted to the first hinge shaft (13).

4. The foldable trolley with a self-locking bottom frame as claimed in claim 1, characterized in that: A limiting rod (14) is fixed inside the connecting rod (12), and a spring (23) is installed between the limiting rod (14) and the telescopic lock head (21), and the spring (23) always makes the telescopic lock head (21) tend to move towards the unlocking member (22).

5. The foldable trolley with a self-locking bottom frame as claimed in claim 4, characterized in that: The telescopic lock head (21) is provided with a receiving groove (213) for receiving the spring (23), and the limiting rod (14) is placed in the receiving groove (213); a spring limiting protrusion (214) is provided on a side of the receiving groove (213) away from the limiting rod (14), one end of the spring (23) is abutted against the limiting rod (14), and the other end is sleeved on the spring limiting protrusion (214).

6. The foldable trolley with a self-locking bottom frame as claimed in claim 2, characterized in that: The unlocking member (22) is L-shaped, and a pulling portion is provided at one end thereof away from the columnar hinge tube (221); a through hole (223) is provided on the pulling portion, a fixing rod (224) is provided in the through hole (223), and a pulling belt (25) is passed through the fixing rod (224).

7. The foldable trolley with a self-locking bottom frame as claimed in claim 1, characterized in that: There are four connecting rods (12) arranged in an X shape, and locking mechanisms are installed between two opposite connecting rods (12) and the supporting base (11).

8. The foldable trolley with a self-locking bottom frame as claimed in claim 1, characterized in that: It also comprises four supporting columns (3) arranged in a rectangular shape, wherein one end of the connecting rod (12) away from the supporting base (11) is hinged on the corresponding supporting column (3); two adjacent supporting columns (3) are connected via an X-shaped folding side frame (4), wherein the upper ends of the X-shaped folding side frame (4) are respectively hinged to the corresponding supporting columns (3), and the lower ends of the X-shaped side frame (4) are respectively hinged to the corresponding supporting columns (3) in a sliding manner.

9. The foldable trolley with a self-locking bottom frame as claimed in claim 8, characterized in that: A handle assembly (5) is installed between any two supporting columns (3), and a supporting crossbeam (6) is installed between the bottoms of the two supporting columns (3), and the supporting crossbeam (6) is arranged opposite to the handle assembly (5); the supporting crossbeam (6) comprises a connecting seat (61) and a parallelogram rod group (62) symmetrically arranged on both sides of the connecting seat (61), and the parallelogram rod group (62) comprises an upper supporting rod (621) and a lower supporting rod (622) which are arranged in parallel and staggered, and the upper supporting rod (621) and the lower supporting rod (622) have the same length, and the upper supporting rod (621) is located on the upper side of the lower supporting rod (622); one end of the upper supporting rod (621) and the lower supporting rod (622) is hinged to the corresponding supporting column (3), and the other end is hinged to the connecting seat (61).

10. The foldable trolley with a self-locking bottom frame according to claim 9, characterized in that: An X-shaped extension frame (7) that can be expanded outward is installed between the two supporting columns (3), and the lower ends of the X-shaped extension frame (7) are respectively hinged to the corresponding supporting columns (3); a U-shaped frame (8) is installed between the two supporting columns (3), and the two ends of the U-shaped frame (8) are respectively hinged to the corresponding supporting columns (3); the X-shaped extension frame (7), the U-shaped frame (8) and the supporting crossbeam (6) are located on the same side.

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