Cart

Abstract

The cart comprises a bottom frame, a first vertical frame, a second vertical frame, a side wall frame and a lock mechanism, the bottom frame is configured to be extensible and retractable, the first vertical frame is arranged at one end of the bottom frame, the second vertical frame is arranged at the other end of the bottom frame, and the side wall frame is arranged between the first vertical frame and the second vertical frame and connected with the first vertical frame and the second vertical frame. The side wall frame is configured to be extensible and retractable; when the side wall frame and the bottom frame stretch, the cart is in the stretching state, when the side wall frame and the bottom frame retract, the cart is in the retracting state, and the lock mechanism is suitable for locking the side wall frame when the cart is switched to the stretching state and unlocking the side wall frame so that the cart can be switched to the retracting state.

Description

Technical Field

[0001] The present application relates to the technical field of transportation tools, and in particular to a cart. Background Art

[0002] There are many types of carts such as beach carts and picnic carts, which are mainly composed of a base frame, a front frame, a rear frame and side frames, and occupy a large volume. For this reason, the carts are designed to be extendable and retractable in related products. When in use, the carts are switched to an extended state to facilitate loading objects. When not in use, the carts are switched to a retracted state to facilitate storage. In some cases, the cart products may accidentally switch from an extended state to a retracted state. Utility Model Content

[0003] The present application aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present application proposes a cart.

[0004] To achieve the above objectives, the present application discloses a cart, which includes:

[0005] a chassis configured to be extendable and retractable;

[0006] a first vertical frame, the first vertical frame being arranged at one end of the base frame;

[0007] a second vertical frame, the second vertical frame being disposed at the other end of the base frame;

[0008] a side frame, the side frame being disposed between the first vertical frame and the second vertical frame and connecting the first vertical frame and the second vertical frame, the side frame being configured to be extendable and retractable; when the side frame and the bottom frame are extended, the stroller is in an extended state, and when the side frame and the bottom frame are retracted, the stroller is in a retracted state; and

[0009] A locking mechanism is adapted to lock the side frames when the stroller is switched to an extended state, and to unlock the side frames to enable the stroller to be switched to a retracted state.

[0010] In some embodiments of the present application, the side frame is a scissors structure.

[0011] In some embodiments of the present application, the side frame includes a plurality of connected scissor assemblies, a first scissor assembly is located at one end of the side frame, the first scissor assembly includes a first scissor arm and a second scissor arm, the first scissor arm and the second scissor arm are cross-arranged and rotatably connected, an end of the first scissor arm is rotatably connected to the first vertical frame, an end of the second scissor arm is rotatably and slidably connected to the first vertical frame, and the locking mechanism is suitable for locking the sliding of the second scissor arm when the cart is switched to an extended state, and is suitable for unlocking the sliding of the second scissor arm to allow the cart to switch to a retracted state.

[0012] In some embodiments of the present application, the first vertical frame includes a first support rod and a slide seat, the slide seat is slidably disposed on the first support rod, the end of the second scissors arm and the slide seat are rotatably connected, and the locking mechanism is suitable for locking the sliding of the slide seat when the cart is switched to an extended state, and is suitable for unlocking the sliding of the slide seat to enable the cart to switch to a retracted state.

[0013] In some embodiments of the present application, the connection position between the first scissor arm and the first vertical frame is arranged above the slide seat.

[0014] In some embodiments of the present application, the slide seat can be slidably mounted on the first support rod, and the slide seat is provided with a locking hole;

[0015] The locking mechanism comprises a locking pin, which is suitable for being inserted into the locking hole to lock the slide seat, and is suitable for being disengaged from the locking hole to unlock the slide seat.

[0016] In some embodiments of the present application, the lock mechanism further includes a lock seat and an elastic member, the lock pin is movably disposed on the lock seat, and the elastic member abuts between the lock seat and the lock pin;

[0017] The lock seat is arranged inside the first support rod, and the first support rod is provided with a through hole. The lock pin is suitable for passing through the through hole and being inserted into the lock hole under the action of the elastic member to lock the slide seat. The lock pin is also suitable for disengaging from the lock hole when retracting to unlock the slide seat.

[0018] In some embodiments of the present application, the slide seat can slide to a first position and a second position relative to the first support rod, in the first position, the cart is in an extended state, and in the second position, the cart is in a retracted state;

[0019] The locking pin has a guiding slope and a stop surface; the guiding slope is suitable for contacting the slide when the slide slides from the second position to the first position, so that the locking pin retracts first and then snaps into the locking hole; the stop surface is suitable for contacting the hole wall of the locking hole when the slide slides to the first position, so as to limit the slide from sliding from the first position toward the second position.

[0020] In some embodiments of the present application, a second scissors assembly is located at the other end of the side frame, and the second scissors assembly includes a third scissors arm, a fourth scissors arm and a fifth scissors arm, the third scissors arm and the fourth scissors arm are cross-arranged and rotatably connected, an end of the third scissors arm is rotatably connected to the second vertical frame, an end of the fourth scissors arm is rotatably connected to one end of the fifth scissors arm, and the other end of the fifth scissors arm is rotatably connected to the second vertical frame.

[0021] In some embodiments of the present application, the first scissors arm and the third scissors arm are rotatably connected, and the second scissors arm and the fourth scissors arm are rotatably connected.

[0022] In some embodiments of the present application, the base frame includes a first base frame and a second base frame, one end of the first base frame is rotatably connected to one end of the second base frame, the other end of the first base frame is rotatably connected to the first vertical frame, and the other end of the second base frame is rotatably connected to the second vertical frame.

[0023] In some embodiments of the present application, when the cart switches from an extended state to a retracted state, the first bottom frame rotates upward relative to the first vertical frame, and the second bottom frame rotates upward relative to the second vertical frame.

[0024] In some embodiments of the present application, the first vertical frame and the second vertical frame are alternately arranged along a first direction, and along a second direction perpendicular to the first direction, the side surrounding frames are respectively connected between one side of the first vertical frame and one side of the second vertical frame, and between the other side of the first vertical frame and the other side of the second vertical frame.

[0025] In some embodiments of the present application, the cart further comprises a push handle, and the push handle is rotatably connected to the first vertical frame or the second vertical frame;

[0026] And / or, the cart further comprises a tow bar, wherein the tow bar is detachably connected to the base frame;

[0027] And / or, the cart further comprises an umbrella cover rod, and the first vertical frame and the second vertical frame are detachably connected to the umbrella cover rod.

[0028] Other advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art 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 designs can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of a cart in an extended state in some embodiments;

[0031] Figure 2 for Figure 1 Left side view of the structure shown;

[0032] Figure 3 A schematic diagram of the process of switching the cart from an extended state to a retracted state in some embodiments;

[0033] Figure 4 for Figure 3 Left side view of the structure shown;

[0034] Figure 5 A schematic diagram of a cart in a collapsed state in some embodiments;

[0035] Figure 6 for Figure 5 Left side view of the structure shown;

[0036] Figure 7 Schematic diagram of the cooperation between the first support rod, the slide seat and the locking mechanism in some embodiments;

[0037] Figure 8 for Figure 7 The enlarged view shown in the figure marked with A;

[0038] Fig. 9 for Figure 7 Exploded view of the structure shown;

[0039] Fig.10 for Fig. 9 The enlarged view marked as B in FIG.

[0040] Fig.11 A schematic diagram of the extension of the side frame in some embodiments;

[0041] Fig.12 Schematic diagram of the side frame contraction in some embodiments.

[0042] Description of Figure Numbers:

[0043] Cart 10, base frame 110, first base frame 111, second base frame 112, first vertical frame 120, first support rod 121, through hole 1211, first connecting seat 122, slide seat 123, locking hole 1231, second vertical frame 130, third connecting seat 131, fourth connecting seat 132, side frame 140, scissor assembly 141, first scissor assembly 142, first scissor arm 1421, second scissor arm 1422, second scissor assembly 143, third scissor arm 1431, fourth scissor arm 1432, fifth scissor arm 1433, locking mechanism 150, locking seat 151, locking pin 152, guiding inclined surface 1521, stop surface 1522, push handle 160, tow rod 170, umbrella cover rod 180.

[0044] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0049] The present application proposes a cart 10, combined with Figures 1 to 8 As shown, the cart 10 includes a base frame 110, a first vertical frame 120, a second vertical frame 130, a side frame 140 and a locking mechanism 150. The base frame 110 is configured to be extendable and retractable. The first vertical frame 120 is provided at one end of the base frame 110, and the second vertical frame 130 is provided at the other end of the base frame 110. The side frame 140 is provided between the first vertical frame 120 and the second vertical frame 130 and connects the first vertical frame 120 and the second vertical frame 130. The side frame 140 is configured to be extendable and retractable. When the side frame 140 and the base frame 110 are extended, the cart 10 is in an extended state, and when the side frame 140 and the base frame 110 are retracted, the cart 10 is in a retracted state. The locking mechanism 150 is suitable for locking the side frame 140 when the cart 10 is switched to the extended state, and is suitable for unlocking the side frame 140 to enable the cart 10 to switch to the retracted state.

[0050] Specifically, the cart 10 in the present application refers to a product that can be loaded with items and can be pushed and pulled by the user, and is mainly used in scenes such as beaches, camping, picnics, etc., and of course can also be used for general item transportation. The cart 10 has an extended state and a retracted state. When the cart 10 is in the extended state, it can be loaded with items to achieve the transportation of items. When the cart 10 is in the retracted state, it can be stored to save space. The extension and retraction of the cart 10 are mainly achieved by the cooperation of the bottom frame 110, the first vertical frame 120, the second vertical frame 130, the side frame 140 and other components.

[0051] The first vertical frame 120 is arranged at one end of the bottom frame 110, and the second vertical frame 130 is arranged at the other end of the bottom frame 110. The first vertical frame 120 and the second vertical frame 130 extend in the up-down direction. The side surrounding frame 140 is arranged between the first vertical frame 120 and the second vertical frame 130 and connects the first vertical frame 120 and the second vertical frame 130. The side surrounding frame 140 is located above the bottom frame 110. In this way, a certain storage cavity is surrounded by the bottom frame 110, the first vertical frame 120, the second vertical frame 130 and the side surrounding frame 140, and items can be placed in this storage cavity.

[0052] The side frame 140 can be arranged on one side or on two opposite sides. The side frame 140 can be arranged on two opposite sides to improve the stability of the cart 10. Figure 1 As shown, the first vertical frame 120 and the second vertical frame 130 are arranged alternately along the first direction, and the side frame 140 includes two side frames 140, and the two side frames 140 are arranged alternately along the second direction. The second direction is perpendicular to the first direction, and the position of the first vertical frame 120 is the front, and the position of the second vertical frame 130 is the rear. The two side frames 140 are arranged alternately along the left and right directions, and one of the side frames 140 connects one side of the first vertical frame 120 along the second direction (the left side of the first vertical frame 120) and one side of the second vertical frame 130 along the second direction (the left side of the second vertical frame 130), and the other side frame 140 connects the other side of the first vertical frame 120 along the second direction (the right side of the first vertical frame 120) and the other side of the second vertical frame 130 along the second direction (the right side of the second vertical frame 130).

[0053] In this embodiment, the bottom frame 110 is designed to be extendable and retractable, and the side frame 140 is designed to be extendable and retractable, that is, the bottom frame 110 and the side frame 140 can realize structural transformation, and the structure shows extension and contraction. When the bottom frame 110 and the side frame 140 are retracted, the first vertical frame 120 and the second vertical frame 130 are moved closer to each other, so that the cart 10 is switched to the retracted state. When the bottom frame 110 and the side frame 140 are extended, the first vertical frame 120 and the second vertical frame 130 are moved away from each other, so that the cart 10 is switched to the extended state. It can be understood that the structure of the bottom frame 110 and the side frame 140 in this embodiment can refer to the relevant technology to realize extension and contraction.

[0054] When the stroller 10 is switched to the extended state, it is not desirable to accidentally switch to the retracted state. For this reason, in the present embodiment, a locking mechanism 150 is provided. The locking mechanism 150 is used to lock and unlock the side frame 140. As mentioned above, the side frame 140 is extended and retracted through structural transformation. When the locking mechanism 150 locks the side frame 140, it restricts and limits the side frame 140, and the side frame 140 cannot achieve structural transformation. When the locking mechanism 150 unlocks the side frame 140, it releases the restriction on the side frame 140, and the side frame 140 can achieve structural transformation. That is, when the stroller 10 is switched to the extended state, the corresponding base frame 110 and the side frame 140 are extended. At this time, the side frame 140 is locked by the locking mechanism 150, and the side frame 140 cannot undergo structural transformation, that is, the side frame 140 cannot be retracted. Since the side frame 140 cannot be retracted, the base frame 110 cannot be retracted either, ensuring that the stroller 10 is in the extended state at this time.

[0055] When the stroller 10 switches from the extended state to the retracted state, the lock mechanism 150 unlocks the side frame 140, and the side frame 140 can undergo a structural change, so that the side frame 140 can be retracted, and the first vertical frame 120 and the second vertical frame 130 can move toward each other, driving the side frame 140 and the bottom frame 110 to retract, so that the stroller 10 switches to the retracted state. When the stroller 10 switches from the retracted state to the extended state, the first vertical frame 120 and the second vertical frame 130 can move away from each other, driving the side frame 140 and the bottom frame 110 to extend, until the side frame 140 is locked by the lock mechanism 150, so that the stroller 10 switches to the extended state.

[0056] It is understandable that the lock mechanism 150 can also lock and unlock the bottom frame 110. When the lock mechanism 150 locks and unlocks the bottom frame 110, it has a similar technical effect as the lock mechanism 150 locking and unlocking the side frame 140. However, since the side frame 140 is higher than the bottom frame 110, when the lock mechanism 150 is used to lock and unlock the side frame 140, it is easier for the user to observe and operate the lock mechanism 150, further improving the user experience.

[0057] Combination Figure 1 , Fig.11 and Fig.12 As shown, in some embodiments of the present application, the side frame 140 is a scissor structure, which is a superposition of a planar connecting rod mechanism, and the extension and contraction are achieved by changing the angle of the connecting rod mechanism. For example, some elevators use a scissor structure. In this embodiment, by designing the side frame 140 as a scissor structure, the extension and contraction can be achieved through structural changes, and the stability of the connection between the first vertical frame 120 and the second vertical frame 130 can be improved.

[0058] Continue to combine Figure 1 , Fig.11 and Fig.12 As shown, in some embodiments of the present application, the side frame 140 includes a plurality of connected scissor assemblies 141, and a first scissor assembly 142 is located at one end of the side frame 140. The first scissor assembly 142 includes a first scissor arm 1421 and a second scissor arm 1422. The first scissor arm 1421 and the second scissor arm 1422 are cross-arranged and rotatably connected. An end of the first scissor arm 1421 is rotatably connected to the first vertical frame 120, and an end of the second scissor arm 1422 is rotatably and slidably connected to the first vertical frame 120. The locking mechanism 150 is suitable for locking the sliding of the second scissor arm 1422 when the cart 10 is switched to the extended state, and is suitable for unlocking the sliding of the second scissor arm 1422 to allow the cart 10 to switch to the retracted state.

[0059] Specifically, the side enclosure frame 140 includes a plurality of connected scissor assemblies 141, wherein a plurality in this document means two or more, and the number of scissor assemblies 141 may be two, three, four or more. Among the plurality of scissor assemblies 141, the one located at one end of the side enclosure frame 140 is defined as a first scissor assembly 142, and the one located at the other end of the side enclosure frame 140 is a second scissor assembly 143. The first scissor assembly 142 is connected to the first vertical frame 120, and the second scissor assembly 143 is connected to the second vertical frame 130. For example, in this embodiment, the scissor assembly 141 includes two, one of which is a first scissor assembly 142, and the other is a second scissor assembly 143, and the first scissor assembly 142 and the second scissor assembly 143 are connected.

[0060] The first scissors assembly 142 includes a first scissors arm 1421 and a second scissors arm 1422. The first scissors arm 1421 and the second scissors arm 1422 are cross-arranged and rotatably connected. When the first scissors arm 1421 and the second scissors arm 1422 rotate relative to each other, based on the characteristics of the side frame 140 (scissors structure), other scissors assemblies 141 can be driven to move, thereby realizing the extension and contraction of the entire side frame 140.

[0061] The end of the first scissor arm 1421 is rotatably connected to the first vertical frame 120, and the end of the second scissor arm 1422 is rotatably and slidably connected to the first vertical frame 120. For example, the first scissor arm 1421 is rotatably connected to a certain connection position (first connection seat 122) of the first vertical frame 120, and the connection position (first connection seat 122) is fixed, so the first scissor arm 1421 can only rotate relative to the first vertical frame 120 but cannot slide relative to the first vertical frame 120, and the second scissor arm 1422 is rotatably connected to another connection position (sliding seat 123) of the first vertical frame 120, and the sliding seat 123 is not fixed but slidable, so the second scissor arm 1422 can both rotate and slide.

[0062] When the locking mechanism 150 locks the sliding of the second scissor arm 1422, the second scissor arm 1422 cannot slide relative to the first vertical frame 120, thereby limiting the rotation between the first scissor arm 1421 and the second scissor arm 1422, thereby limiting the structural transformation of the side frame 140, that is, when the side frame 140 is extended, the locking mechanism locks the sliding of the second scissor arm 1422, and the side frame 140 will not shrink accidentally, thereby ensuring that the cart 10 is in an extended state.

[0063] When the locking mechanism 150 unlocks the sliding of the second scissor arm 1422, the second scissor arm 1422 can slide relative to the first vertical frame 120, thereby releasing the rotation restriction between the first scissor arm 1421 and the second scissor arm 1422, so that the side frame 140 can achieve structural transformation, that is, the side frame 140 can be retracted, so that the cart 10 can switch from the extended state to the retracted state.

[0064] The rotatable and slidable connection between the second scissor arm 1422 and the first vertical frame 120 is achieved by the following scheme. Figures 1 to 8 As shown, in some embodiments of the present application, the first vertical frame 120 includes a first support rod 121 and a slide 123, the slide 123 is slidably arranged on the first support rod 121, the end of the second scissor arm 1422 and the slide 123 are rotatably connected, and the locking mechanism 150 is suitable for locking the sliding of the slide 123 when the cart 10 is switched to the extended state, and is suitable for unlocking the sliding of the slide 123 to switch the cart 10 to the retracted state.

[0065] Specifically, the first support rod 121 is generally a metal pipe with high structural strength. The slide 123 is disposed on the first support rod 121 and can slide to a first position and a second position relative to the first support rod 121. The slide 123 is generally an integral injection molded part. The end of the second scissor arm 1422 is rotatably connected to the slide 123. Since the slide 123 can slide relative to the first support rod 121, the second scissor arm 1422 can rotate and slide relative to the first vertical frame 120.

[0066] When the locking mechanism 150 locks the sliding of the slide 123, the slide 123 cannot slide relative to the first support rod 121, thereby limiting the rotation of the second scissor arm 1422 relative to the slide 123, and further limiting the rotation between the second scissor arm 1422 and the first scissor arm 1421, so that the side frame 140 cannot undergo structural changes. Through such an arrangement, when the side frame 140 is extended, the side frame 140 will not accidentally shrink, ensuring that the cart 10 is in an extended state.

[0067] When the locking mechanism 150 unlocks the sliding of the slide 123, the slide 123 can slide relative to the first support rod 121, thereby releasing the rotation restriction of the second scissor arm 1422 relative to the slide 123, and further releasing the rotation restriction between the second scissor arm 1422 and the first scissor arm 1421, so that the side frame 140 can undergo structural transformation. Through such a setting, the side frame 140 can be retracted, so that the cart 10 can switch from an extended state to a retracted state.

[0068] Furthermore, combined with Figures 1 to 6As shown, the connection position between the first scissor arm 1421 and the first vertical frame 120 is arranged above the slide 123. Specifically, the first vertical frame 120 also includes a first connecting seat 122, the first connecting seat 122 is immovable relative to the first support rod 121, the first connecting seat 122 is arranged above the slide 123, and the end of the first scissor arm 1421 is connected to the first connecting seat 122. It can be understood that the bottom frame 110, the first vertical frame 120, the second vertical frame 130 and the side frame 140 constitute the skeleton structure of the cart 10, and the skeleton structure is hollow, so it is necessary to install a vehicle cover on the skeleton structure. As described above, the accommodating cavity formed by the bottom frame 110, the first vertical frame 120, the second vertical frame 130 and the side frame 140 has a certain depth. When the cart 10 is in the extended state, the side frame 140 needs to be arranged at an upper position and arranged alternately with the bottom frame 110. In this way, there is space between the side frame 140 and the bottom frame 110 for the side frame 140 to be retracted, and at the same time, better support can be achieved for the top edge of the vehicle cover. The first connecting seat 122 is arranged above the slide seat 123 (that is, the connecting position between the first scissor arm 1421 and the first vertical frame 120 is arranged above the slide seat 123). When the cart 10 is switched from the extended state to the retracted state, the slide seat 123 slides downward, making full use of the space between the side frame 140 and the bottom frame 110.

[0069] Combination Figures 7 to 10 As shown, in some embodiments of the present application, the slide 123 can be slidably mounted on the first support rod 121, and the slide 123 is provided with a locking hole 1231; the locking mechanism 150 includes a locking pin 152, the locking pin 152 is suitable for being inserted into the locking hole 1231 to lock the slide 123, and is suitable for being disengaged from the locking hole 1231 to unlock the slide 123.

[0070] Specifically, the slide 123 can slide to a first position and a second position. When the slide 123 slides to the first position, the lock pin 152 is inserted into the lock hole 1231. The lock pin 152 and the lock hole 1231 cooperate with each other to lock the slide 123. The slide 123 cannot leave the first position and slide to the second position, so that the cart 10 is in an extended state. When the slide 123 slides from the first position to the second position, the lock pin 152 is controlled to disengage from the lock hole 1231, so that the slide 123 is unlocked, and the slide 123 can slide from the first position to the second position, so that the cart 10 is in a retracted state.

[0071] Further, continue to combine Figures 7 to 10As shown, the locking mechanism 150 also includes a locking seat 151 and an elastic member (not shown in the figure), the locking pin 152 is movably arranged on the locking seat 151, and the elastic member abuts between the locking seat 151 and the locking pin 152; the locking seat 151 is arranged inside the first support rod 121, and the first support rod 121 is provided with a through hole 1211, and the locking pin 152 is suitable for passing through the through hole 1211 and being stuck in the locking hole 1231 under the action of the elastic member to lock the slide 123, and the locking pin 152 is also suitable for disengaging from the locking hole 1231 when retracting to unlock the slide 123.

[0072] Specifically, by designing the lock seat 151, a basis is provided for the installation of the elastic member and the locking pin 152. The elastic member is arranged between the lock seat 151 and the locking pin 152, so as to support the locking pin 152. The lock seat 151 is installed inside the first support rod 121 to be fixed. The position of the lock seat 151 relative to the first support rod 121 is fixed. In order to achieve the cooperation between the locking pin 152 and the locking hole 1231, a through hole 1211 is arranged on the first support rod 121, and the locking pin 152 can pass through the through hole 1211 and be inserted into the locking hole 1231. That is, when the cart 10 needs to be switched to the extended state, the slide 123 slides to the first position, and the locking pin 152 passes through the through hole 1211 under the action of the elastic member and is inserted into the locking hole 1231, thereby locking the slide 123. When the cart 10 needs to be switched to the retracted state, the locking pin 152 is controlled to retract, and the locking pin 152 disengages from the locking hole 1231 to unlock the slide 123, and the slide 123 can slide to the second position, and the elastic member is deformed to accumulate elastic potential energy.

[0073] Combination Fig.10 As shown, the locking pin 152 has a guiding inclined surface 1521 and a stop surface 1522; the guiding inclined surface 1521 is suitable for contacting the slide 123 when the slide 123 slides from the second position to the first position, so that the locking pin 152 first retracts and then snaps into the locking hole 1231; the stop surface 1522 is suitable for abutting against the hole wall of the locking hole 1231 when the slide 123 slides to the first position, so as to limit the slide 123 from sliding from the first position toward the second position.

[0074] Specifically, when the cart 10 needs to be switched to the extended state, the slide 123 slides from the second position toward the first position. When the slide 123 is about to slide to the first position, the slide 123 and the guide slope 1521 of the locking pin 152 come into contact. Under the action of force, the slide 123 forces the locking pin 152 to retract first until the slide 123 slides to the first position so that the locking hole 1231 and the through hole 1211 correspond. Under the action of the elastic member, the locking pin 152 passes through the through hole 1211 to be stuck in the locking hole 1231. Through such a setting, the cart 10 is switched to the extended state, and the user does not need to directly operate the locking pin 152, which is convenient and quick.

[0075] When the slide 123 is in the first position, if the slide 123 wants to slide toward the second position, it will be blocked by the stop surface 1522. The contact portion of the slide 123 with the stop surface 1522 is parallel to the stop surface 1522, and the sliding directions of the stop surface 1522 and the slide 123 are perpendicular. Therefore, the slide 123 cannot force the stop surface 1522 to retract, preventing the slide 123 from sliding from the first position to the second position, ensuring that the cart 10 is in the extended state. When the cart 10 needs to be switched to the retracted state, the user can operate the lock pin 152 to retract, for example, applying force to the lock pin 152 to force the lock pin 152 to retract, so that the lock pin 152 is disengaged from the lock hole 1231.

[0076] Combination Figure 1 , Fig.11 and Fig.12 As shown, in some embodiments of the present application, located at the other end of the side frame 140 is a second scissors assembly 143, the second scissors assembly 143 includes a third scissors arm 1431, a fourth scissors arm 1432 and a fifth scissors arm 1433, the third scissors arm 1431 and the fourth scissors arm 1432 are cross-arranged and rotatably connected, an end of the third scissors arm 1431 is rotatably connected to the second vertical frame 130, an end of the fourth scissors arm 1432 is rotatably connected to one end of the fifth scissors arm 1433, and the other end of the fifth scissors arm 1433 is rotatably connected to the second vertical frame 130.

[0077] Specifically, the second vertical frame 130 includes a third connecting seat 131 and a fourth connecting seat 132. The end of the third scissors arm 1431 can be rotatably connected to the third connecting seat 131, and the end of the fifth scissors arm 1433 can be rotatably connected to the fourth connecting seat 132. In this way, the connection points between the third scissors arm 1431 and the fourth scissors arm 1432, the connection points between the fourth scissors arm 1432 and the fifth scissors arm 1433, the connection points between the fifth scissors arm 1433 and the fourth connecting seat 132, and the connection points between the third scissors arm 1431 and the third connecting seat 131 form a quadrilateral. There is no need to set up a structure like the slide seat 123 on the second vertical frame 130, and the structural transformation of the side frame 140 can be achieved.

[0078] Combination Fig.11As shown, in this embodiment, the side frame 140 includes a scissors-fork assembly 141, a first scissors-fork assembly 142 and a second scissors-fork assembly 143, respectively. The first scissors-fork assembly 142 is connected to the first vertical frame 120, and the second scissors-fork assembly 143 is connected to the second vertical frame 130, and the first scissors-fork assembly 142 and the second scissors-fork assembly 143 are connected. The first scissors-fork assembly 142 and the second scissors-fork assembly 143 are connected, that is, the first scissors-fork arm 1421 and the third scissors-fork arm 1431 are rotatably connected, and the second scissors-fork arm 1422 and the fourth scissors-fork arm 1432 are rotatably connected. The extension and contraction of the cart 10 can be achieved by the cooperation of the two scissors-fork assemblies 141.

[0079] Combination Figure 1 and Figure 3 As shown, in some embodiments of the present application, the base frame 110 includes a first base frame 111 and a second base frame 112. One end of the first base frame 111 and one end of the second base frame 112 are rotatably connected, the other end of the first base frame 111 and the first vertical frame 120 are rotatably connected, and the other end of the second base frame 112 and the second vertical frame 130 are rotatably connected. The structural change of the base frame 110 can be achieved by the cooperation of the first base frame 111 and the second base frame 112. When the cart 10 is switched to a retracted state or an extended state, the first base frame 111 and the second base frame 112 rotate relatively, and the first base frame 111 and the first vertical frame 120 rotate relatively, and the second base frame 112 and the second vertical frame 130 rotate relatively.

[0080] Furthermore, when the cart 10 switches from the extended state to the retracted state, the first bottom frame 111 rotates upward relative to the first vertical frame 120, and the second bottom frame 112 rotates upward relative to the second vertical frame 130. When the cart 10 is in the extended state, the bottom frame 110 is relatively flat. Since the first vertical frame 120 and the second vertical frame 130 are arranged on the bottom frame 110 and extend upward from the bottom frame 110 for a certain distance, when the cart 10 switches to the retracted state, the first bottom frame 111 rotates upward relative to the first vertical frame 120, and the second bottom frame 112 rotates upward relative to the second vertical frame 130, the space above the bottom frame 110 can be fully utilized, and it can be ensured that the wheels of the cart 10 are in continuous contact with the ground when the cart 10 switches from the extended state to the retracted state.

[0081] Combination Figures 1 to 6 As shown, in some embodiments of the present application, the cart 10 further includes a handle 160, which is rotatably connected to the first vertical frame 120 or the second vertical frame 130. The handle 160 is convenient for the user to hold the cart 10 and move it on the ground. And the handle 160 is rotatable, so when the cart 10 is switched to the retracted state, the handle 160 can be rotated to fit the first vertical frame 120 or the second vertical frame 130, for example Figure 1The push handle 160 is disposed on the first vertical frame 120 . When the cart 10 switches to the retracted state, the first vertical frame 120 can be rotated downward to fit with the first vertical frame 120 . When the cart 10 switches to the extended state, the push handle 160 is rotated in the opposite direction to a position suitable for the user to hold.

[0082] Combination Figures 1 to 6 As shown, the cart 10 further includes a towing rod 170, which is detachably connected to the base frame 110. The towing rod 170 is provided to provide more towing modes for the user to choose. The towing rod 170 is designed to be detachably connected, for example, a snap connection. When the towing rod 170 is needed, the towing rod 170 can be installed on the base frame 110, and when the towing rod 170 is not needed, the towing rod 170 can be removed, or when the cart 10 is switched to the retracted state, the towing rod 170 can be removed.

[0083] Combination Figures 1 to 6 As shown, the cart 10 also includes an umbrella cover rod 180, which is used to support the umbrella cover, so that the umbrella cover can shield the space below. The first vertical frame 120 and the second vertical frame 130 are respectively detachably connected with the umbrella cover rod 180. The detachable connection is, for example, a plug-in connection, which is convenient and quick. When the umbrella cover is needed, the umbrella cover rod 180 is installed to the first vertical frame 120 and the second vertical frame 130. When the umbrella cover is not needed, the umbrella cover rod 180 can be removed, or when the cart 10 is switched to the retracted state, the umbrella cover rod 180 can be removed.

[0084] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made based on the concept of the present application and the contents of the present application description and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A cart (10), characterized in that: The cart (10) comprises: A base frame (110), the base frame (110) being configured to be extendable and retractable; A first vertical frame (120), the first vertical frame (120) being arranged at one end of the bottom frame (110); A second vertical frame (130), the second vertical frame (130) being arranged at the other end of the bottom frame (110); a side frame (140), the side frame (140) being disposed between the first vertical frame (120) and the second vertical frame (130) and connecting the first vertical frame (120) and the second vertical frame (130), the side frame (140) being configured to be extendable and retractable; when the side frame (140) and the bottom frame (110) are extended, the cart (10) is in an extended state, and when the side frame (140) and the bottom frame (110) are retracted, the cart (10) is in a retracted state; and A locking mechanism (150) is provided, wherein the locking mechanism (150) is suitable for locking the side frame (140) when the stroller (10) is switched to an extended state, and is suitable for unlocking the side frame (140) to enable the stroller (10) to be switched to a retracted state.

2. The stroller (10) according to claim 1, characterized in that: The side frame (140) is a scissor structure.

3. The cart (10) according to claim 2, characterized in that: The side frame (140) includes a plurality of connected scissor assemblies (141), wherein a first scissor assembly (142) is located at one end of the side frame (140), wherein the first scissor assembly (142) includes a first scissor arm (1421) and a second scissor arm (1422), wherein the first scissor arm (1421) and the second scissor arm (1422) are cross-arranged and rotatably connected, wherein an end of the first scissor arm (1421) is rotatably connected to the first vertical frame (120), and an end of the second scissor arm (1422) is rotatably and slidably connected to the first vertical frame (120), and wherein the locking mechanism (150) is suitable for locking the sliding of the second scissor arm (1422) when the cart (10) is switched to an extended state, and is suitable for unlocking the sliding of the second scissor arm (1422) so that the cart (10) is switched to a retracted state.

4. The stroller (10) according to claim 3, characterized in that: The first vertical frame (120) comprises a first support rod (121) and a slide seat (123), wherein the slide seat (123) is slidably arranged on the first support rod (121), and the end of the second scissor arm (1422) is rotatably connected to the slide seat (123), and the locking mechanism (150) is suitable for locking the sliding of the slide seat (123) when the cart (10) is switched to an extended state, and is suitable for unlocking the sliding of the slide seat (123) so that the cart (10) is switched to a retracted state.

5. The stroller (10) according to claim 4, characterized in that: The connection position between the first scissor arm (1421) and the first vertical frame (120) is arranged above the slide seat (123).

6. The stroller (10) according to claim 4, characterized in that: The sliding seat (123) can be slidably mounted on the first support rod (121), and the sliding seat (123) is provided with a locking hole (1231); The locking mechanism (150) comprises a locking pin (152), wherein the locking pin (152) is adapted to be inserted into the locking hole (1231) to lock the slide seat (123), and is adapted to be disengaged from the locking hole (1231) to unlock the slide seat (123).

7. The stroller (10) according to claim 6, characterized in that The lock mechanism (150) further comprises a lock seat (151) and an elastic member, the lock pin (152) is movably arranged on the lock seat (151), and the elastic member abuts between the lock seat (151) and the lock pin (152); The locking seat (151) is arranged inside the first support rod (121), and the first support rod (121) is provided with a through hole (1211). The locking pin (152) is suitable for passing through the through hole (1211) and being inserted into the locking hole (1231) under the action of the elastic member to lock the sliding seat (123). The locking pin (152) is also suitable for disengaging from the locking hole (1231) when retracting to unlock the sliding seat (123).

8. The stroller (10) according to claim 7, characterized in that: The slide seat (123) can slide to a first position and a second position relative to the first support rod (121), wherein in the first position, the cart (10) is in an extended state, and in the second position, the cart (10) is in a retracted state; The locking pin (152) has a guiding inclined surface (1521) and a stop surface (1522); the guiding inclined surface (1521) is suitable for contacting the slide seat (123) when the slide seat (123) slides from the second position to the first position, so that the locking pin (152) first retracts and then snaps into the locking hole (1231); the stop surface (1522) is suitable for contacting the hole wall of the locking hole (1231) when the slide seat (123) slides to the first position, so as to limit the slide seat (123) from sliding from the first position to the second position.

9. The stroller (10) according to claim 3, characterized in that: Located at the other end of the side frame (140) is a second scissors assembly (143), the second scissors assembly (143) includes a third scissors arm (1431), a fourth scissors arm (1432) and a fifth scissors arm (1433), the third scissors arm (1431) and the fourth scissors arm (1432) are cross-arranged and rotatably connected, the end of the third scissors arm (1431) is rotatably connected to the second vertical frame (130), the end of the fourth scissors arm (1432) is rotatably connected to one end of the fifth scissors arm (1433), and the other end of the fifth scissors arm (1433) is rotatably connected to the second vertical frame (130).

10. The stroller (10) according to claim 9, characterized in that The first scissor arm (1421) and the third scissor arm (1431) are rotatably connected, and the second scissor arm (1422) and the fourth scissor arm (1432) are rotatably connected.

11. The stroller (10) according to claim 1, characterized in that: The base frame (110) comprises a first base frame (111) and a second base frame (112); one end of the first base frame (111) and one end of the second base frame (112) are rotatably connected, the other end of the first base frame (111) and the first vertical frame (120) are rotatably connected, and the other end of the second base frame (112) and the second vertical frame (130) are rotatably connected.

12. The stroller (10) according to claim 11, characterized in that When the cart (10) switches from an extended state to a retracted state, the first bottom frame (111) rotates upward relative to the first vertical frame (120), and the second bottom frame (112) rotates upward relative to the second vertical frame (130).

13. The stroller (10) according to claim 1, characterized in that: The first vertical frame (120) and the second vertical frame (130) are alternately arranged along a first direction, and along a second direction perpendicular to the first direction, the side surrounding frames (140) are respectively connected between one side of the first vertical frame (120) and one side of the second vertical frame (130), and between the other side of the first vertical frame (120) and the other side of the second vertical frame (130).

14. The stroller (10) according to claim 1, characterized in that: The cart (10) further comprises a push handle (160), wherein the push handle (160) is rotatably connected to the first vertical frame (120) or the second vertical frame (130); And / or, the cart (10) further comprises a tow bar (170), wherein the tow bar (170) and the base frame (110) are detachably connected; And / or, the cart (10) further comprises an umbrella cover rod (180), and the first vertical frame (120) and the second vertical frame (130) are detachably connected to the umbrella cover rod (180).

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