A handcart for transporting pet carriers

Abstract

The utility model relates to a hand cart for transporting pet box and bag, including fixed support and the adjustable support of slidable connection with fixed support, adjustable support can switch between extension and contraction position to at least part in the outline range of fixed support under the contraction state, traction assembly includes the pull rod rotatable connection in the mounting seat through the pivot, and the pull rod can switch between unfolding and folding state, and when folding, with adjacent and parallel support frame bottom surface, thereby realize the compact storage and convenient transportation of support.

Description

Technical Field

[0001] This utility model relates to the field of pet supplies, specifically to a handcart for transporting pet carriers. Background Technology

[0002] In the field of pet travel and logistics transportation, especially in scenarios such as airports, train stations, pet hotels, and pet supply logistics warehouses, transport racks for conveniently moving pet carriers are gradually being used. Currently, most transport racks on the market that are compatible with pet carriers adopt a fixed frame and fixed pull rod design. The main frame is typically constructed by directly welding or splicing several fixed rods. The length, width, and height of the frame are not adjustable after manufacturing. This makes it difficult to adjust the load-bearing space according to different sizes of pet carriers, and it is also impossible to extend or retract according to different usage scenarios. This results in a large overall volume of the bracket when not in use, which not only increases the space occupied by home storage, store organization, and logistics handling, but also easily leads to stacking gaps when multiple brackets are stacked (such as for pet supply warehouse stocking or transportation company equipment turnover) due to the fixed size, resulting in low storage efficiency and indirectly increasing warehousing and transportation costs. At the same time, most existing pet carrier transport brackets have a separate pull rod on the outside of the frame. The pull rod can be folded and stored on top of the frame. This structure affects the overall compactness when the bracket is used with the pet carrier and is prone to collisions with other items during handling or stacking. This may not only damage the pull rod structure, but also scratch the surface of the pet carrier and even disturb the pet inside. Utility Model Content

[0003] This invention provides a handcart for transporting pet carriers to solve the problems mentioned in the background art.

[0004] A trolley for transporting pet carriers includes a support frame, a moving component, and a traction component. The support frame consists of a fixed bracket and an adjustable bracket, which can slide relative to the fixed bracket, allowing the support frame to switch between an unfolded state carrying the pet carrier and a retracted state. The fixed bracket connects several mutually perpendicular horizontal and vertical support rods via connecting sleeves. The horizontal support rods are hollow rods with internal mounting channels. The extension rods of the adjustable brackets pass through the inner cavity of the connecting sleeve and the mounting channels of the horizontal support rods, forming a sliding fit. The moving component is installed at the bottom of the support frame. The traction component includes a mounting base fixed to the support frame and a pull rod that can pivot relative to the mounting base (switching between an unfolded and retracted position).

[0005] Preferably, both the transverse support rod and the extension rod have square cross-sections, with the inner wall cross-section of the transverse support rod having a side length D1 greater than the outer surface cross-section of the extension rod having a side length D2. The adjusting bracket also includes a fixing rod, and the extension rod and the fixing rod are orthogonally rigidly connected by a fastener with a bolted structure. The mounting base is equipped with a locking mechanism, which is an integrally formed mounting protrusion. The end of the pull rod near the mounting base has a matching snap-fit ​​groove, and the mounting protrusion snaps into the snap-fit ​​groove to achieve axial limiting and locking. The moving component includes multiple wheel seats and wheel assemblies. The wheel seats are fixed to the support frame by bolts, and the wheel assemblies are inserted into the wheel seats. The wheel seat is equipped with a locking assembly, including a snap-fit ​​protrusion. The connecting shaft of the wheel assembly has an annular groove in the circumference. The snap-fit ​​protrusion is embedded in the groove to achieve fixation. The locking assembly also includes a control button and a return spring. Pressing the button can disengage the snap-fit ​​protrusion from the groove to remove the wheel assembly. The wheel assembly includes a rear wheel group, an intermediate wheel group, and a front wheel group. The rear wheel group is fixed to the adjusting bracket via the wheel seat (it can only roll around its own horizontal axis). The intermediate wheel group and the front wheel group are fixed to the fixed bracket (with a universal steering shaft) via the wheel seat. The front wheel group is equipped with a braking mechanism, including a pedal and a brake block. When the pedal is pressed, the brake block fits against the wheel body to restrict rolling.

[0006] The beneficial effects of this utility model are as follows: the telescopic structure of the support frame reduces the lateral space by 30%-40% after storage, improving storage utilization; the rotation-clamping locking and multi-section telescopic design of the pull rod takes into account both usability and compact storage; the tool-free quick-release structure of the wheel assembly and the front wheel braking mechanism ensure stable transportation and convenient maintenance. Overall, it has significant improvements in storage efficiency, operation and maintenance, load-bearing stability and safety. Attached Figure Description

[0007] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0008] Figure 1 A perspective view of an embodiment of this utility model;

[0009] Figure 2 for Figure 1 Top view of the embodiment;

[0010] Figure 3 for Figure 1 An exploded view of a portion of the structure in the illustrated embodiment;

[0011] Figure 4 for Figure 3 A cross-sectional schematic diagram of the embodiment shown;

[0012] Figure 5 for Figure 1 A three-dimensional schematic diagram of another state of the illustrated embodiment;

[0013] Figure 6 for Figure 1 Another perspective view of the embodiment shown;

[0014] Figure 7 for Figure 6 A three-dimensional schematic diagram of another state of the illustrated embodiment;

[0015] Figure 8 for Figure 7 A partially enlarged schematic diagram of the embodiment shown;

[0016] Figure 9 for Figure 7 A perspective view of the mounting base in the illustrated embodiment;

[0017] Figure 10 for Figure 1 A three-dimensional schematic diagram of another state of the illustrated embodiment;

[0018] Figure 11 for Figure 1 A perspective view of the moving component in the illustrated embodiment;

[0019] Figure 12 for Figure 11 A perspective view of the wheel assembly in the illustrated embodiment;

[0020] Figure 13 for Figure 12 A partially enlarged schematic diagram of the embodiment shown;

[0021] Figure 14 for Figure 11 A schematic diagram of the wheel seat in the embodiment shown;

[0022] Figure 15 for Figure 12 A three-dimensional schematic diagram of the front wheel assembly in the embodiment shown;

[0023] Figure 16 for Figure 1 A three-dimensional schematic diagram of the support frame in the embodiment shown;

[0024] Figure 17 for Figure 5 A three-dimensional schematic diagram of the support frame in the embodiment shown;

[0025] Reference numerals: trolley for transporting pet carriers (10); support frame (100); fixed bracket (110); transverse support rod (111); longitudinal support rod (112); opening (113); mounting channel (114); adjusting bracket (120); extension rod (121); fixing rod (122); connecting sleeve (130); fastener (140); traction assembly (200); pull rod (210); snap-fit ​​groove (211); curved handle (212); middle telescopic section (213); bottom fixing section (214); unlock button (215) ); mounting base (220); rotating shaft (221); locking mechanism (230); mounting protrusion (231); boss (232); moving assembly (300); wheel assembly (310); connecting shaft (311); annular groove (312); rear wheel assembly (313); intermediate wheel assembly (314); front wheel assembly (315); wheel seat (320); mounting hole (321); locking assembly (330); control button (331); snap-fit ​​protrusion (332); return spring (333); brake mechanism (340); pedal (341); brake block (342). Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. The following description of at least one exemplary embodiment is illustrative in nature and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary rather than limiting. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] This invention addresses the dual technical shortcomings of existing transport brackets, such as inconvenient storage, large space occupation, and difficulties in maintenance and replacement due to the rigid connection between the pull rod and the main body. It provides a handcart for transporting pet carriers. This handcart utilizes a telescopic combination structure of a fixed bracket and an adjustable bracket, along with a multi-section telescopic pull rod that can fold around a pivot and has locking / unlocking mechanisms. This achieves both ergonomic and compact design during use, reducing storage space and maintenance costs. The specific embodiments of this handcart for transporting pet carriers are described in detail below with reference to the accompanying drawings.

[0030] like Figure 1 and Figure 2 As shown, this utility model discloses a handcart 10 for transporting pet carriers, including a support frame 100, a traction component 200, and a moving component 300. The support frame 100 is a rectangular frame base, including a fixed bracket 110 and an adjustable bracket 120. The fixed bracket 110 consists of several transverse support rods 111 and longitudinal support rods 112, which are arranged perpendicularly to each other and rigidly connected at their intersection points by connecting sleeves 130, forming a frame base with a regular square geometric profile. This provides a stable planar support structure for carrying the pet carrier. The transverse support rods 111 and longitudinal support rods 112 are preferably square-section rods.

[0031] The connecting sleeve 130 is integrally molded from engineering plastic injection molding and has an overall I-shaped sleeve structure. It is configured as a hollow sleeve component that fits into the intersection of the transverse support rod 111 and the longitudinal support rod 112. The inner cavity forms a square hole groove that matches the shape of the transverse support rod 111 and the longitudinal support rod 112, which radially clamps the two rods and achieves a rigid connection, preventing axial relative displacement between the transverse support rod 111 and the longitudinal support rod 112.

[0032] See Figure 2 and Figure 3 Each transverse support rod 111 of the fixed bracket 110 has an opening 113 at one end near the adjusting bracket 120, and the interior of the transverse support rod 111 forms an axially extending mounting channel 114 for fitting the adjusting bracket 120. Specifically, the adjusting bracket 120 is a rectangular frame structure, the core components of which include extension rods 121 and fixed rods 122. The extension rods 121 are configured as square cross-section support rods extending along the same axial direction as the transverse support rods 111, and the number of extension rods 121 is the same as the number of transverse support rods 111. The extension rods 121 and fixed rods 122 are orthogonally rigidly connected at their intersection nodes by fasteners 140, together forming the load-bearing frame base of the adjusting bracket 120, ensuring that the adjusting bracket 120 does not deform when bearing the load of the pet carrier.

[0033] The fixing member 140 is an angle fixing member set at the intersection of the extension rod 121 and the fixing rod 122. It is connected to the extension rod 121 and the fixing rod 122 by bolt connection, thereby forming a reliable orthogonal rigid connection at the intersection of the extension rod 121 and the fixing rod 122 to prevent relative sliding under load.

[0034] Furthermore, please refer to the following: Figure 3 , Figure 4 , Figure 5 , Figure 16 and Figure 17 As shown, the cross-sections of both the extension rod 121 and the transverse support rod 111 are designed as squares. The side length of the inner wall cross-section of the transverse support rod 111 is defined as D1, and the side length of the outer surface cross-section of the extension rod 121 is defined as D2. The two satisfy the dimensional relationship that D1 > D2, and the dimensional difference is controlled within 0.1-0.3mm. This dimensional difference design avoids excessive gaps that could cause radial wobbling when the extension rod 121 slides, and also prevents interference fits that could cause sliding jamming, ensuring smooth telescopic operation. Furthermore, the axis of the mounting channel 114 of the transverse support rod 111 is aligned with and passes through the axis of the inner cavity of the connecting sleeve 130. The extension rod 121 passes sequentially through the inner cavity of the connecting sleeve 130 and the mounting channel 114 of the transverse support rod 111 to form a sliding fit relationship between the adjusting bracket 120 and the fixed bracket 110.

[0035] Based on this size fit, the extension rod 121 can be precisely inserted into the installation channel 114 of the transverse support rod 111, and the outer wall of the extension rod 121 and the inner wall of the transverse support rod 111 form a tightly fitting sliding sleeve structure. This structure allows the adjusting bracket 120 to smoothly extend and retract along the axial direction of the transverse support rod 111, providing a structural basis for dynamically adjusting the transverse load-bearing span of the support frame 100. On the other hand, the adaptability of the square cross section can limit the rotational freedom of the extension rod 121 around its own axis, avoiding misalignment of the relative position of the adjusting bracket 120 and the fixed bracket 110 due to rotation during the extension and retraction process, thereby ensuring the overall load-bearing stability of the support frame 100 and preventing tilting when the pet carrier is placed.

[0036] In other embodiments (not shown in the figures), a buffer pad is provided between the fixed bracket 110 and the adjusting bracket 120. The buffer pad is preferably made of rubber, silicone, or a composite elastic material and is fixedly installed on the inner wall of the fixed bracket 110 or the outer wall of the adjusting bracket 120. During the retraction of the adjusting bracket 120 into the fixed bracket 110, the buffer pad abuts against the contact surface of the other component, thereby forming a flexible buffer between them. This flexible buffer not only effectively avoids direct hard collisions between metal parts, reducing noise and vibration, but also absorbs some impact loads, preventing wear on the bracket surface and extending the overall service life of the bracket. Furthermore, this buffer structure improves the smoothness of the telescopic operation, making the telescopic movement of the adjusting bracket more stable and further optimizing the user experience.

[0037] Please continue reading. Figure 2 The fixing rod 122 is configured as a square-section support rod extending in the same direction as the longitudinal support rod 112. The extension rod 121 and the fixing rod 122 together form the rectangular frame base of the adjusting bracket 120. This frame base is parallel and coplanar with the square frame of the fixing bracket 110, and can work together to form a continuous box-shaped bearing surface when the adjusting bracket 120 is deployed, so as to achieve uniform distribution of support force and avoid box deformation or bracket damage caused by local stress concentration.

[0038] Specifically, when the extension rod 121 is inserted into the mounting channel 114 of the transverse support rod 111, the fixed rod 122 and the longitudinal support rod 112 of the fixed bracket 110 are arranged in parallel, allowing the adjusting bracket 120 to achieve smooth sliding extension and retraction relative to the fixed bracket 110 along the extension direction of the transverse support rod 111. On the one hand, when the adjusting bracket 120 is in the extended position, the transverse load-bearing span of the support frame 100 can be dynamically changed by adjusting the depth of the extension rod 121 inserted into the mounting channel 114, thereby adapting to pet carriers of different lengths and widths and improving the bracket's load-bearing adaptability to diverse pet carriers. On the other hand, when the bracket is in an idle storage state, the extension rod 121 can be completely retracted into the mounting channel 114, allowing the adjusting bracket 120 to be embedded within the frame range of the fixed bracket 110, significantly reducing the overall outline size of the support frame 100. Compared to traditional fixed-size brackets, the shrinkable support frame can reduce the lateral space occupied by 30%-40%, which not only makes it easier to stack multiple brackets tightly, but also adapts to the storage needs of scenarios such as warehouse corners and narrow spaces in transport vehicles, greatly improving the space utilization rate of warehousing and transportation and reducing the relevant costs for operators.

[0039] In other embodiments (not shown in the figures), the adjusting bracket 120 is provided with multiple limiting grooves at intervals along the telescopic direction. The limiting grooves can be equidistant or non-equidistant. A limiting element is provided on the inner wall or at a relative position of the fixed bracket 110. This limiting element can be an elastic protrusion, a snap-fit ​​piece, or an elastic steel ball structure. When the adjusting bracket 120 telescopically moves relative to the fixed bracket 110, the limiting element can sequentially engage or embed into the corresponding limiting groove under elastic action, thereby forming a multi-level telescopic positioning. Through this multi-level limiting design, users can lock the adjusting bracket at different extension lengths according to the shape of different sized pet carriers or the need for load-bearing balance during transportation, thus ensuring transportation stability while also taking into account storage compactness and operational flexibility.

[0040] In other embodiments (not shown in the figures), the outer wall of the adjusting bracket 120 is provided with a groove along its length. The groove is preferably a recessed strip-shaped groove, and its walls are smoothed to reduce frictional resistance. The inner wall of the fixed bracket 110 is provided with a limiting protrusion at a position corresponding to the groove. The limiting protrusion can be embedded inside the groove and slide within it, thus providing linear guidance during the extension and retraction of the adjusting bracket 120. Through this limiting and guiding structure, the adjusting bracket 120 can smoothly extend and retract along a predetermined straight direction, avoiding jamming caused by deviation or shaking. Simultaneously, this structure reduces wear between the telescopic components, improves the stability and durability of the telescopic movement, and ensures that the transport bracket maintains smooth telescopic performance even after long-term use.

[0041] Please refer to the following: Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The traction assembly 200 includes a pull rod 210 and a mounting base 220 for connecting the pull rod 210 to a fixed bracket 110. The mounting base 220 is fixedly connected to the fixed bracket 110 by bolts. The mounting base 220 has a pivot 221, and the bottom end of the pull rod 210 is connected to the pivot 221 and pivotally connected to the mounting base 220 via the pivot 221. The mounting base 220 also includes a locking mechanism 230. In a preferred embodiment of this invention, the locking mechanism 230 is a mounting protrusion 231 integrally formed with the mounting base 220. The mounting protrusion 231 extends along the axial direction of the transverse support rod 111 and away from the transverse support rod 111, and forms a boss 232 at its end. Correspondingly, the end of the pull rod 210 near the mounting base 220 has a locking groove 211 for engaging the mounting protrusion 231 to form a locking relationship between the pull rod 210 and the fixed bracket 110.

[0042] When the pull rod 210 is unfolded, it rotates around the pivot 221 in a direction close to the upper surface of the fixed bracket 110 until it is in a 90° force-applying posture with the upper surface of the fixed bracket 110. At this time, the locking groove 211 of the pull rod 210 and the mounting protrusion 231 of the mounting base 220 fit together: the inner wall of the locking groove 211 and the outer wall of the mounting protrusion 231 form an axial limit through surface contact, and the protrusion 232 is locked into the interior of the locking groove 211 to form a stable lock. This constraint ensures that the pull rod 210 maintains a stable support angle when the user applies force, avoiding unexpected deflection due to vibration or external force. This not only ensures the stability of the operation's mechanical properties, but also simplifies the unfolding process through the "rotation-locking" integrated design, enabling a quick switch to a usable state; see also Figure 10 If the pull rod 210 needs to be folded, the user needs to apply force to push the pull rod 210 in the opposite direction of unfolding and rotating (i.e., in the direction away from the upper surface of the fixed bracket 110 and towards the bottom surface of the fixed bracket 110). The applied force needs to overcome the static friction between the mating surface of the locking groove 211 and the mounting protrusion 231 and the limiting constraint force between the boss 232 and the inner wall of the locking groove 211, so as to cause the mounting protrusion 231 to gradually disengage from the mating space of the locking groove 211 and release the locking relationship between the two. As the force continues to be applied, the pull rod 210 continues to rotate around the pivot 221 toward the bottom surface of the fixed bracket 110 until the pull rod 210 rotates to a retracted position parallel to the bottom surface of the fixed bracket 110. At this time, the pull rod 210 is close to the bottom surface of the fixed bracket 110 and has no outward protruding structure. That is, the projection of the pull rod 210 in the direction perpendicular to the bottom surface of the support frame 100 falls completely within the area defined by the outline of the support frame 100. It can work together with the retracted support frame 100 of the adjustable bracket 120 to reduce the overall outline of the equipment and further reduce the space occupied when idle.

[0043] In other embodiments (not shown in the figures), the pull rod 210 can not only switch between unfolded and folded states, but is also further configured to be positioned and locked at multiple angles within the range of 0° to 90°. Specifically, an angle adjustment locking mechanism is provided between the pivot 221 of the mounting base 220 and the pull rod 210. This locking mechanism can adopt a ratchet disc with a spring-loaded locking pin, or a multi-hole positioning plate with a spring-loaded pin. When the user rotates the pull rod to the desired angle, the locking pin in the locking mechanism can automatically engage in the corresponding positioning groove or positioning hole, thereby fixing the pull rod 210 at that angle and preventing it from rotating. With the above structure, the user can freely adjust the angle position of the pull rod 210 according to their own height, operating habits, and the load weight of the transport case, making the pulling posture of the trolley 10 used for transporting pet carriers more ergonomic and significantly improving the comfort and operational stability during use.

[0044] In other embodiments (not shown in the figures), the bottom surface of the fixing bracket 110 is pre-set with a receiving groove, or a fixing strap is provided at a corresponding position on the bottom. When the pull rod 210 is in the folded state, the pull rod 210 can be embedded in the receiving groove, or restrained by the fixing strap, thereby preventing the pull rod 210 from becoming loose or shaking when not in use. The receiving groove can be a semi-circular groove or a rectangular groove that matches the shape of the pull rod 210, and its depth and width are designed to stably accommodate the pull rod 210; the fixing strap can be made of elastic material or nylon Velcro material, and is tightly attached to the bottom surface of the bracket by wrapping around the pull rod. With the above structure, the transport bracket can maintain a compact state during idle, storage, or stacking, avoiding damage or affecting the stacking stability due to accidental detachment or shaking of the pull rod 210, further improving the overall safety and practicality.

[0045] See Figure 5 and Figure 6The pull rod 210 is configured as a telescopic multi-section pull rod assembly, employing a nested metal tube structure. It includes an arc-shaped handle 212 for user grip, an axially adjustable intermediate telescopic section 213, and a bottom fixed section 214 connected to the pivot 221 of the mounting base 220. The intermediate telescopic section 213 uses a conventional "elastic locking protrusion-positioning hole" structure common in the luggage pull rod industry. This structure is a mature and well-known technology, and its implementation is not shown in detail in the figure. Gear switching can be achieved as follows: when the user presses the unlock button 215 on the handle 212, the locking protrusion disengages from the positioning hole, allowing the intermediate telescopic section 213 to slide axially along the tube, flexibly adjusting the overall height of the pull rod 210; after releasing the unlock button 215, the locking protrusion engages with the positioning hole of the corresponding gear, forming an axial limit constraint, ensuring the length of the pull rod 210 remains stable during traction, and preventing unexpected extension or retraction due to vibration or external force. This telescopic design not only improves human-machine adaptability through multi-level adjustment, but also shortens the idle height of the pull rod when stored. In conjunction with the storage logic of the pull rod folding around the pivot, it further compresses the overall outline size of the equipment and optimizes the utilization rate of storage and transportation space.

[0046] like Figure 1 , Figure 11 and Figure 14 As shown, the moving assembly 300 includes multiple sets of wheel assemblies 310 and multiple wheel seats 320 for fixing each wheel assembly 310 to the support frame 100. Each wheel seat 320 is fixed to the support frame 100 by bolts. The wheel seat 320 is provided with a locking assembly 330, which includes a control button 331, a snap-fit ​​protrusion 332 fixedly connected to the control button, and a return spring 333 fixed at one end and abutting against the snap-fit ​​protrusion 332 at the other end. The locking assembly 330 is used to lock the wheel assembly 310 to the wheel seat 320 or unlock it from the wheel seat 320.

[0047] Please refer to the following for details. Figure 12 , Figure 13 and Figure 14The wheel assembly 310 has a connecting shaft 311 on its top, and the circumferential surface of the connecting shaft 311 has an annular groove 312. The wheel seat 320 has a mounting hole 321. When assembling the wheel assembly 310, the connecting shaft 311 is inserted into the mounting hole 321 of the wheel seat 320. At this time, the snap-fit ​​protrusion 332 is snapped into the annular groove 312 under the elastic force of the return spring 333. The end of the snap-fit ​​protrusion 332 forms a surface contact limit with the groove wall of the annular groove 312, which restricts the connecting shaft 311 from disengaging from the wheel seat 320 in its own axial direction, so that the wheel assembly 310 is used to support the movement of the support frame 100 on the ground. When it is necessary to disassemble or replace the wheel assembly 310, press the control button 331. The control button 331 pushes the locking tab 332 to overcome the elastic force of the return spring 333 and move it away from the connecting shaft 311, causing the locking tab 332 to disengage from the annular groove 312 and releasing the axial constraint on the connecting shaft 311. The wheel assembly 310 can then be pulled out directly, allowing the connecting shaft 311 to disengage from the mounting hole 321 of the wheel seat 320, thus completing the quick disassembly of the wheel assembly 310. This locking structure, through the integrated design of mechanical elastic reset and locking, not only ensures the connection stability of the wheel assembly 310 during transportation (resistance to vibration and impact loads) but also achieves convenient disassembly and assembly without tools, greatly improving the efficiency of equipment operation and maintenance.

[0048] like Figure 12 and Figure 15As shown, in a preferred embodiment of the present invention, the multi-wheel assembly 310 includes a rear wheel assembly 313, a middle wheel assembly 314, and a front wheel assembly 315. The three wheel assemblies provide differentiated support for different areas of the support frame 100: the rear wheel assembly 313 is fixed to the bottom rear end of the adjusting bracket 120 via wheel seats 320, and adopts a fixed wheel structure. The wheel only has the rolling freedom around its own horizontal axis and has no vertical axis steering function. It can provide directional guidance when the bracket is transported in a straight line, avoiding path deviation caused by rear wheel offset; the middle wheel assembly 314 is installed at the bottom rear end of the fixed bracket 110. The middle wheel assembly 314 is equipped with a 360° rotatable universal steering shaft, so that the wheel has both rolling freedom and vertical axis steering freedom. It is used to adjust the movement direction of the trolley 10 used for transporting pet carriers, and is suitable for turning and obstacle avoidance operations of the bracket in narrow passages (such as airport check-in areas and hotel elevator entrances), improving maneuverability; the front wheel assembly 315 is fixed to the bottom front end of the fixed bracket 110. In addition to the universal steering shaft, the front wheel assembly 315 also integrates a braking mechanism 340, which includes a pedal 341 and a brake block 342. When the user presses the pedal 341, it causes the brake block 342 to engage with the wheel, locking the wheel's rolling freedom and keeping the bracket in a fixed position when parking or loading / unloading luggage, preventing slippage caused by external forces. If an upward force is applied to the pedal 341, the brake block 342 can disengage from the wheel surface, allowing the wheel to regain its rolling freedom around its horizontal axis, and the support frame 100 can then be pushed and pulled again.

[0049] This utility model achieves the following technical effects: Through the telescopic sleeve structure of the fixed bracket 110 and the adjusting bracket 120, the adjusting bracket 120 can maintain high rigidity and anti-deflection performance under load, and can retract and embed into the fixed bracket 110 when idle, achieving a retractable load-bearing surface. After storage, the lateral space occupied by the support frame 100 can be reduced by 30%-40%, significantly improving the space utilization rate for stacking, transportation, and storage, and reducing operating costs. Through the "rotation-clamping" locking mechanism between the pull rod 210 and the mounting base 220, and the elastic locking protrusion-positioning hole structure of the multi-section intermediate telescopic section 213, reliable locking of the angle and height of the pull rod during use is achieved. The design achieves machine adaptability and can be stored along the pivot 221 to the bottom of the support frame 100 after unlocking, thus compressing the overall profile and balancing operational comfort with compact storage. The tool-less quick-release locking structure, consisting of the wheel assembly 310, wheel seat 320, and snap-fit ​​protrusion 332 / reset spring 333, ensures reliable axial constraint and rapid assembly / disassembly of the wheel assembly. Combined with the braking mechanism of the pedal 341-brake block 342 of the front wheel assembly 315, it guarantees shock resistance and anti-slip during transportation and stable positioning when parked, while significantly simplifying maintenance and replacement procedures and reducing repair time and costs. In summary, this utility model has achieved significant technological advancements in improving storage efficiency, ease of operation and maintenance, load-bearing stability, and safety of use.

[0050] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A handcart for transporting pet carriers, characterized in that, The system includes a support frame (100) comprising a fixed bracket (110) and an adjustable bracket (120) slidably connected to the fixed bracket (110) such that the support frame (100) can switch between an unfolded state for carrying a pet carrier and a retracted state for storage; a moving assembly (300) mounted on the bottom of the support frame (100); and a traction assembly (200) comprising a mounting base (220) and a pull rod (210), the mounting base (220) being fixed to the support frame (100) and the pull rod (210) being pivotally connected to the mounting base (220) and pivotable between an unfolded position and a retracted position. The fixed bracket (110) includes a connecting sleeve (130) and several mutually perpendicularly arranged transverse support rods (111) and longitudinal support rods (112). The transverse support rods (111) and longitudinal support rods (112) are rigidly connected at their intersection points through the connecting sleeve (130). The connecting sleeve (130) has a through cavity. The transverse support rods (111) are hollow rods with an internal installation channel. The adjusting bracket (120) includes several extension rods (121). The external dimensions of the extension rods (121) are adapted to the dimensions of the installation channel and the cavity of the connecting sleeve (130). The extension rod (121) is sequentially inserted into the inner cavity of the connecting sleeve (130) and the installation channel of the transverse support rod (111) to form a sliding fit relationship between the adjusting bracket (120) and the fixed bracket (110).

2. The pet stroller of claim 1, wherein, The cross-sections of the transverse support rod (111) and the extension rod (121) are both square. The side length of the inner wall cross-section of the transverse support rod (111) is D1, and the side length of the outer surface cross-section of the extension rod (121) is D2, and D1>D2 are satisfied.

3. The pet stroller of claim 1, wherein, The adjusting bracket (120) also includes a fixing rod (122). The extension rod (121) and the fixing rod (122) are connected orthogonally by a fixing member (140). The fixing member (140) is fixedly connected to the extension rod (121) and the fixing rod (122) by bolts.

4. The pet stroller of claim 1, wherein, The mounting base (220) is provided with a locking mechanism (230). The locking mechanism (230) is configured as a mounting protrusion (231) integrally formed with the mounting base (220). The end of the pull rod (210) near the mounting base (220) is provided with a snap-fit ​​groove (211) that cooperates with the mounting protrusion (231). The mounting protrusion (231) is snapped into the snap-fit ​​groove (211) in the snap-fit ​​state to achieve axial limiting and locking.

5. The pet stroller of claim 1, wherein, The moving component (300) includes multiple wheel seats (320) and wheel assemblies (310). The wheel seats (320) are fixedly connected to the support frame (100) by bolts, and the wheel assemblies (310) are inserted and fixed to the wheel seats (320).

6. The pet stroller of claim 5, wherein, The wheel seat (320) is provided with a locking assembly (330), which includes a snap-fit ​​protrusion (332). The wheel assembly (310) is provided with a connecting shaft (311), which has an annular groove (312) along its circumferential direction. The snap-fit ​​protrusion (332) is embedded in the annular groove (312) to fix the wheel seat (320) and the wheel assembly (310) in place.

7. The pet stroller of claim 6, wherein, The locking assembly (330) also includes a control button (331) and a return spring (333). The control button (331) is operatively connected to the snap-fit ​​tab (332). One end of the return spring (333) is fixed, and the other end abuts against the snap-fit ​​tab (332). Pressing the control button (331) can push the snap-fit ​​tab (332) to overcome the elastic force of the return spring (333) and disengage it from the annular slot (312) to the release position, so that the connecting shaft (311) can be pulled out from the wheel seat (320) along its own axial direction to disassemble the wheel assembly (310).

8. The pet stroller of claim 5, wherein, The wheel assembly (310) includes a rear wheel assembly (313), a middle wheel assembly (314), and a front wheel assembly (315); The rear wheel assembly (313) is fixed to the adjusting bracket (120) via wheel seat (320), and the middle wheel assembly (314) and the front wheel assembly (315) are fixed to the fixed bracket (110) via wheel seat (320).

9. The pet stroller of claim 8, wherein, The front wheel assembly (315) is equipped with a braking mechanism (340); The braking mechanism (340) includes a pedal (341) and a brake block (342). When the user presses the pedal (341), the brake block (342) fits against the wheel to restrict the wheel's rolling freedom.

10. The handcart for transporting pet carriers according to claim 8, characterized in that, The rear wheel assembly (313) is a fixed wheel structure, and its wheel only has the degree of freedom of rolling around its own horizontal axis; The intermediate wheel assembly (314) and the front wheel assembly (315) are provided with universal steering shafts for adjusting the direction of movement of the trolley used to transport pet carriers.

Images