Four-wheel orientation mechanism of cart

Abstract

The utility model discloses a four-wheel orientation mechanism of a cart. The four-wheel orientation mechanism comprises a base, a plurality of wheel carriers, a locking structure and a switching piece, the wheel carriers are divided into a first wheel set and a second wheel set, the wheel carriers are rotatably connected to the base, the wheel carriers are rotatably connected with trundles, and rotating shafts of the wheel carriers and rotating shafts of the trundles are arranged in a non-parallel mode; the wheel carrier corresponding to the first wheel set and the wheel carrier corresponding to the second wheel set can be relatively fixed with the base or unfixed with the base through a locking structure; the switching piece can move to a first position and a second position; when the switching piece is located at the first position, the locking structure fixes the first wheel set and unfixes the second wheel set; and when the switching piece is located at the second position, the locking structure unfixes the first wheel set and fixes the second wheel set. By operating the switching piece, the synchronous locking and synchronous unlocking effects of different trundles can be conveniently and quickly achieved, and then operation convenience is brought to a user.

Description

Technical Field

[0001] This utility model relates to the field of infant and toddler products, and in particular to a four-wheel steering mechanism for a stroller. Background Technology

[0002] As we all know, with the increasing popularity of strollers, users have placed higher demands on their functionality and convenience. Traditional strollers are usually equipped with multiple wheels, and these wheels have a steering function. To ensure stable forward movement, the steering function of the wheels is usually combined with a locking mechanism to limit the steering effect when the stroller is moving forward. However, when only individual wheels need to be secured, each wheel usually needs to be locked and unlocked separately, which is undoubtedly cumbersome. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a four-wheel steering mechanism for a trolley, which can easily lock and unlock each caster.

[0004] A four-wheel steering mechanism for a trolley according to a first aspect of the present invention includes: a base, multiple wheel frames, a locking structure, and a switching component; the multiple wheel frames are divided into a first wheel group and a second wheel group, the wheel frames are rotatably connected to the base, and the wheel frames are rotatably connected to casters, the rotation axes of the wheel frames and the rotation axes of the casters are not parallel; the locking structure is disposed between the base and the wheel frames, and the wheel frames corresponding to the first wheel group and the second wheel group can be fixed or unfixed to the base by the locking structure; the switching component is connected to the locking structure, and the switching component can move to a first position and a second position; when the switching component is in the first position, the locking structure fixes the first wheel group and unfixes the second wheel group; when the switching component is in the second position, the locking structure unfixes the first wheel group and fixes the second wheel group.

[0005] The four-wheel steering mechanism of the trolley according to this utility model embodiment has at least the following beneficial effects: the casters on the wheel frame can support the wheel frame and the base, allowing the trolley to move. When the wheel frame rotates relative to the base, it can drive the casters to turn, thereby achieving the effect of turning the trolley. The first wheel set and the second wheel set can respectively correspond to the casters in different positions such as the front and rear, left and right of the trolley. The switching component can move to the first position or the second position and switch the locking relationship of the first wheel set and the second wheel set, thereby easily and conveniently achieving the effect of synchronously locking and unlocking the casters in different parts. Therefore, by operating the switching component, the synchronous locking and unlocking effect of different casters can be conveniently and quickly achieved, thus bringing operational convenience to the user.

[0006] According to some embodiments of the present invention, the locking structure includes a latch and a lock groove, the latch being movable to extend into the lock groove and thus fixing the two together; one of the latch and the lock groove is disposed on the switching member, and the other of the latch and the lock groove is disposed on the wheel frame.

[0007] According to some embodiments of this utility model, there are multiple and the same number of lock tongues and lock slots, and the switching member can rotate relative to the base; each lock slot is correspondingly arranged on the wheel frame; each lock tongue is connected to both sides of the switching member, and when the switching member rotates, it can drive a part of each lock tongue to move closer to its corresponding lock slot, and cause the remaining part of each lock tongue to move away from its corresponding lock slot.

[0008] According to some embodiments of this utility model, there are multiple bases, each corresponding to one of the wheel frames, and the locking tongue is rotatably connected to the base; the switching component is connected to the locking tongue and can drive it to rotate.

[0009] According to some embodiments of the present invention, the switching component is connected to a pull rope and is connected to the locking tongue through the pull rope.

[0010] According to some embodiments of this utility model, a push spring is provided inside the base, and the push spring pushes against the lock tongue and can push the lock tongue toward the lock groove.

[0011] According to some embodiments of the present invention, the switching component is provided with two connecting parts, which are respectively located on both sides of the switching component; one of the two connecting parts is connected to the wheel frame corresponding to the first wheel set via the pull rope, and the other of the two connecting parts is connected to the wheel frame corresponding to the second wheel set via the pull rope.

[0012] According to some embodiments of the present invention, the first wheel set includes multiple wheel frames, and each wheel frame corresponding to the first wheel set is located on the same side of the switching component and is connected to the connecting part through the pull rope.

[0013] According to some embodiments of the present invention, the second wheel set includes multiple wheel frames, each wheel frame corresponding to the second wheel set is located on the same side of the switching member and is connected to the connecting part through the pull rope, and the first wheel set and the second wheel set are located on both sides of the switching member.

[0014] According to some embodiments of the present invention, the connecting part is connected to a support leg, the support leg is connected to the base, and the pull rope is movably disposed inside the support leg.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic diagram of the four-wheel orientation mechanism of the trolley according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram showing the connection status of the four-wheel orientation mechanism of the trolley;

[0019] Figure 3 for Figure 1 A schematic diagram showing the unlocked state of the four-wheel steering mechanism of the trolley;

[0020] Figure 4 for Figure 1 A schematic diagram showing the locked state of the four-wheel steering mechanism of the trolley;

[0021] Figure 5 for Figure 1 A schematic diagram showing the disassembled state of the four-wheel orientation mechanism of the trolley;

[0022] Reference numerals: Switching component 100; Connecting part 150; Support leg 300; Push spring 530; Locking structure 500; Pull rope 550; Lock groove 570; Lock tongue 580; Base 700; Caster 900; First wheel group 910; Second wheel group 920; Wheel frame 950; Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] Reference Figure 1A four-wheel steering mechanism includes: a base 700, multiple wheel frames 950, a locking structure 500, and a switching element 100; the multiple wheel frames 950 are divided into a first wheel group 910 and a second wheel group 920, the wheel frames 950 are rotatably connected to the base 700, and the wheel frames 950 are rotatably connected to casters 900, the rotation axis of the wheel frames 950 and the rotation axis of the casters 900 are not parallel; the locking structure 500 is disposed between the base 700 and the wheel frames 950, and the wheel frames 950 corresponding to the first wheel group 910 and the second wheel group 920 are connected to the first wheel group 910. Each wheel frame 950 corresponding to wheel set 920 can be fixed or released from the base 700 via locking structure 500. Switching element 100 is connected to locking structure 500 and can move to a first position and a second position. When switching element 100 is in the first position, locking structure 500 fixes the first wheel set 910 and releases the second wheel set 920. When switching element 100 is in the second position, locking structure 500 releases the first wheel set 910 and fixes the second wheel set 920. Casters 900 on wheel frame 950 support wheel frame 950 and base 700, allowing the trolley to move. When wheel frame 950 rotates relative to base 700, it drives casters 900 to turn, thus achieving the effect of turning the trolley. The first wheel set 910 and the second wheel set 920 correspond to casters 900 in different positions (front, back, left, right) of the trolley, respectively. The switching element 100 can move to either the first or second position, switching the locking relationship between the first wheel group 910 and the second wheel group 920. This allows for simple and convenient simultaneous locking and unlocking of casters 900 in different locations. Therefore, by operating the switching element 100, the simultaneous locking and unlocking of different casters 900 can be achieved conveniently and quickly, thus providing users with operational convenience.

[0028] Specifically, the first wheel set 910 corresponds to the front wheels of the trolley, and the second wheel set 920 corresponds to the rear wheels of the trolley. When the switching member 100 moves to the first position, the locking member locks the front wheels and unlocks the rear wheels; when the switching member 100 moves to the second position, the locking member locks the rear wheels and unlocks the front wheels.

[0029] In some embodiments, reference is made to Figure 3The locking structure 500 includes a locking tongue 580 and a locking groove 570. The locking tongue 580 can extend into the locking groove 570 and fix the two together. One of the locking tongue 580 and the locking groove 570 is located in the switching member 100, and the other is located in the wheel frame 950. After the locking tongue 580 extends into the locking groove 570, the locking tongue 580 will create a locking effect on the locking groove 570, thereby preventing relative movement between the locking tongue 580 and the locking groove 570. Therefore, by moving the locking tongue 580 through the switching member 100, the steering movement of the wheel frame 950 can be directly and effectively locked or unlocked, thus facilitating the control of the trolley's steering state.

[0030] It is conceivable that the locking structure 500 could also be composed of other components, such as clamping the wheel frame 950 with grippers to achieve the effect of locking the wheel frame 950. Therefore, the specific implementation of the locking structure 500 is not unique, but can be adjusted accordingly based on the actual situation, and is not limited here.

[0031] In some embodiments, reference is made to Figure 2 There are multiple and identical locking tongues 580 and locking slots 570. The switching element 100 can rotate relative to the base 700. Each locking slot 570 is correspondingly set on the wheel frame 950. Each locking tongue 580 is connected to both sides of the switching element 100. When the switching element 100 rotates, it can drive a part of each locking tongue 580 to move closer to its corresponding locking slot 570, and cause the remaining part of each locking tongue 580 to move away from its corresponding locking slot 570. When the switching element 100 rotates, the position and distance relationship between its two sides will change, and it will drive the locking tongues 580 located on both sides to move together. Among them, the locking tongue 580 located on one side of the switching element 100 will be driven forward by the switching element 100, so that the locking tongue 580 can be inserted into the locking slot 570 and locked; while the locking tongue 580 located on the other side of the switching element 100 will be driven away from its corresponding locking slot 570, and the corresponding wheel frame 950 will be unlocked. Therefore, by rotating the switch 100, the effect of locking some casters 900 in the direction of rotation and unlocking some casters 900 in the direction of rotation can be achieved directly and effectively, thereby reducing the operational burden when locking and unlocking each caster 900 and providing customers with a more convenient operating experience.

[0032] It is conceivable that the switching element 100 could also be a sliding button, which would move the locking tongues 580 on both sides of it by sliding. The specific implementation method is not unique, but can be adjusted according to the actual situation, and is not limited here.

[0033] In some embodiments, reference is made to Figure 2Multiple bases 700 are connected to the wheel frames 950 one by one. The locking tongue 580 is rotatably connected to the base 700. The switching element 100 is connected to the locking tongue 580 and can drive it to rotate. The rotatable connection between the locking tongue 580 and the base 700 makes the movement of the locking tongue 580 within the base 700 more stable and reliable, and avoids the problem of the locking tongue 580 falling off due to excessive displacement when the switching element 100 drives the locking tongue 580 to move, thereby ensuring that the locking operation is carried out stably and reliably.

[0034] In some embodiments, reference is made to Figure 4 The switching element 100 is connected to a pull rope 550 and is connected to the locking tongue 580 via the pull rope 550. The pull rope 550 allows the switching element 100 to be positioned away from the locking tongue 580, thereby preventing the movement of the switching element 100 from being interfered with by the wheel frame 950 and the caster 900. Furthermore, the long-distance connection between the switching element 100 and the locking tongue 580 via the pull rope 550 also allows the switching element 100 to be installed in a position away from the locking tongue 580 as needed, facilitating user operation of the switching element 100.

[0035] In some embodiments, reference is made to Figure 5 A push spring 530 is provided inside the base 700. The push spring 530 pushes against the latch 580 and can push the latch 580 toward the lock groove 570. The push spring 530 can continuously provide a pushing force to the latch 580, so that the latch 580 can automatically lock into the lock groove 570, thereby ensuring that the latch 580 can continuously and stably maintain the locked state of the lock groove 570.

[0036] Specifically, the push spring 530 is fitted around the outer periphery of the pull rope 550.

[0037] In some embodiments, reference is made to Figure 2 The switching component 100 is provided with two connecting parts 150, located on opposite sides of the switching component 100. One of the connecting parts 150 is connected to the wheel frame 950 corresponding to the first wheel group 910 via a pull rope 550, and the other connecting part 150 is connected to the wheel frame 950 corresponding to the second wheel group 920 via a pull rope 550. The two connecting parts 150 can connect the first wheel group 910 and the second wheel group 920 respectively, thereby ensuring that the first wheel group 910 and the second wheel group 920 are connected to the switching component 100 in an orderly manner. Furthermore, by determining the connection position of the pull rope 550 through the connecting parts 150, the problems of the pull rope 550 curling, tangling, and interfering with each other due to the rotation of the switching component 100 can be effectively avoided.

[0038] In some embodiments, reference is made to Figure 2The first wheel set 910 includes multiple wheel frames 950. Each wheel frame 950 of the first wheel set 910 is located on the same side of the switching element 100 and is connected to the connecting part 150 via a pull rope 550. The multiple wheel frames 950 and their corresponding casters 900 can be located on the same side of the trolley, thereby cooperating with the second wheel set 920 to provide a multi-point positioning effect for the trolley, thus effectively improving the stability of the trolley during movement.

[0039] Specifically, the first wheel set 910 includes two wheel frames 950, and the first wheel set 910 is the front wheel of the trolley.

[0040] In some embodiments, reference is made to Figure 2 The second wheel set 920 includes multiple wheel frames 950. Each wheel frame 950 of the second wheel set 920 is located on the same side of the switching element 100 and is connected to the connecting part 150 via a pull rope 550. The first wheel set 910 and the second wheel set 920 are located on opposite sides of the switching element 100. The multiple wheel frames 950 and their corresponding casters 900 can be positioned together on the same side of the trolley away from the first wheel set 910. Thus, the first wheel set 910 and the second wheel set 920 can work together to support the trolley from both sides, and each side of the trolley has multi-point support, thereby further improving the stability of the trolley's movement.

[0041] In some embodiments, reference is made to Figure 1 The connecting part 150 is connected to the support leg 300, which is connected to the base 700. The pull rope 550 is movably disposed within the support leg 300. The support leg 300 not only connects the trolley body and the casters 900, but also wraps and protects the pull rope 550, thereby avoiding the risk of the pull rope 550 being exposed and damaged.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A four-wheel orientation mechanism for a trolley, characterized in that, include: Base (700); Multiple wheel frames (950) are provided, and the multiple wheel frames (950) are divided into a first wheel group (910) and a second wheel group (920). The wheel frames (950) are rotatably connected to the base (700), and the wheel frames (950) are rotatably connected to casters (900). The rotation axis of the wheel frames (950) and the rotation axis of the casters (900) are not parallel. A locking structure (500) is disposed between the base (700) and the wheel frame (950). The wheel frame (950) corresponding to the first wheel set (910) and the wheel frame (950) corresponding to the second wheel set (920) can be fixed or released from the base (700) by the locking structure (500). A switching element (100) is connected to the locking structure (500). The switching element (100) can move to a first position and a second position. When the switching element (100) is in the first position, the locking structure (500) fixes the first wheel set (910) and releases the second wheel set (920). When the switching element (100) is in the second position, the locking structure (500) releases the first wheel set (910) and fixes the second wheel set (920).

2. The four-wheel orientation mechanism of the trolley as described in claim 1, characterized in that: The locking structure (500) includes a latch (580) and a lock groove (570), wherein the latch (580) is movable and extends into the lock groove (570) and the two are fixed to each other; one of the latch (580) and the lock groove (570) is disposed on the switching member (100), and the other of the latch (580) and the lock groove (570) is disposed on the wheel frame (950).

3. The four-wheel orientation mechanism of the trolley as described in claim 2, characterized in that: There are multiple and the same number of latches (580) and latches (570). The switching member (100) can rotate relative to the base (700). Each latch (570) is correspondingly provided on the wheel frame (950). Each latch (580) is connected to both sides of the switching member (100). When the switching member (100) rotates, it can drive a part of each latch (580) to move closer to its corresponding latch (570) and cause the remaining part of each latch (580) to move away from its corresponding latch (570).

4. The four-wheel orientation mechanism of the trolley as described in claim 3, characterized in that: The base (700) is multiple and is connected to the wheel frame (950) one by one. The locking tongue (580) is rotatably connected to the base (700). The switching member (100) is connected to the locking tongue (580) and can drive it to rotate.

5. The four-wheel orientation mechanism of the trolley as described in claim 4, characterized in that: The switching element (100) is connected to a pull rope (550) and is connected to the locking tongue (580) through the pull rope (550).

6. The four-wheel orientation mechanism of the trolley as described in claim 5, characterized in that: A push spring (530) is provided inside the base (700). The push spring (530) pushes against the latch (580) and can push the latch (580) toward the lock groove (570).

7. The four-wheel orientation mechanism of the trolley as described in claim 5, characterized in that: The switching component (100) is provided with two connecting parts (150), which are located on both sides of the switching component (100). One of the two connecting parts (150) is connected to the wheel frame (950) corresponding to the first wheel set (910) via the pull rope (550), and the other of the two connecting parts (150) is connected to the wheel frame (950) corresponding to the second wheel set (920) via the pull rope (550).

8. The four-wheel orientation mechanism of the trolley as described in claim 7, characterized in that: The first wheel set (910) includes multiple wheel frames (950), and each wheel frame (950) corresponding to the first wheel set (910) is located on the same side of the switching member (100) and is connected to the connecting part (150) through the pull rope (550).

9. The four-wheel orientation mechanism of the trolley as described in claim 7, characterized in that: The second wheel set (920) includes multiple wheel frames (950). Each wheel frame (950) corresponding to the second wheel set (920) is located on the same side of the switching member (100) and is connected to the connecting part (150) through the pull rope (550). The first wheel set (910) and the second wheel set (920) are located on both sides of the switching member (100).

10. The four-wheel orientation mechanism of the trolley as described in claim 7, characterized in that: The connecting part (150) is connected to a support leg (300), the support leg (300) is connected to the base (700), and the pull rope (550) is movably disposed within the support leg (300).

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