Clamping type modular cat nest climbing frame

Through a snap-fit ​​modular design, the cat bed resting area and climbing structure are integrated into the basic unit component, solving the problems of scene separation and stability of existing products. This enables flexible adjustment and convenient assembly, meeting the natural behavioral needs of cats and the needs of family space.

CN121753728APending Publication Date: 2026-03-31CHANGZHOU VOCATIONAL INST OF ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-26
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

Existing cat house and cat tree combination products have problems in design, such as rigid structure, fragmented scene, unbalanced size, poor stability, complicated assembly and high transportation costs, which cannot meet the natural behavioral needs of cats and the needs of family space.

Method used

Adopting a snap-fit ​​modular design, the cat bed resting area and climbing structure are integrated into the basic unit main component through mortise and tenon snap-fit ​​structure and bolt connection. Combined with the modular expansion method, the height and width of the cat bed climbing frame can be flexibly adjusted. The standardized rectangular frame structure is used to ensure structural stability and convenient assembly.

Benefits of technology

It achieves an organic integration of cat bed and climbing frame functions, meets the natural behavioral needs of cats, improves structural stability and assembly efficiency, reduces transportation costs and maintenance difficulty, and supports personalized customization and accessory expansion.

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Abstract

The invention relates to a clamping type modular cat nest climbing frame which comprises at least one basic unit main part. The basic unit main part comprises two side plates, two hole opening plates, a top plate and a bottom plate; an internal space defined by the rectangular frame body forms a cat rest area or an internal activity area; the upper and lower sides of the side plates are respectively clamped and fixed with the top plate and the bottom plate; the upper end of the hole plate and the top plate as well as the lower end and the bottom plate are fixed through bolt assemblies; a climbing structure is further arranged on the basic unit main part and used for supporting a cat to climb and move in the vertical direction; a plurality of basic unit main parts can be stacked in the vertical direction in a bolt connection mode, so that the height expansion of the cat nest climbing frame is realized; and the plurality of basic unit main parts can also be abutted against each other through the outer side surfaces of the adjacent side plates, so that the parallel expansion of the cat nest climbing frame in the horizontal direction is realized. In this way, the functions of resting, climbing, patrolling, hiding and the like are organically integrated, and the problem of scene splitting of a traditional combined product is solved.
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Description

Technical Field

[0001] This invention relates to the field of cat climbing frame technology, specifically a snap-fit ​​modular cat bed climbing frame. Background Technology

[0002] With the increasing popularity of pet ownership, the demand for products that combine rest and activity spaces for cats is growing. Currently, common cat bed and cat tree combinations on the market attempt to integrate a cat's living and play areas, but they have many shortcomings in actual design and application: 1. Existing products often employ simple stacking or mechanical assembly of functional modules, such as hanging or attaching cat beds directly to the side of the cat tree, resulting in a rigid structure and a fragmented environment. This design often ignores the cat's natural behavioral patterns, causing interference between the rest area and the activity area, and failing to smoothly connect the complete behavioral chain of "climbing-inspecting-resting-hiding." Furthermore, most products are fixed structures, unable to be flexibly adjusted and expanded according to the cat's growth stage, home space layout, or the needs of multiple cats living together.

[0003] 2. Product dimensions are often unbalanced to actual home space: The overall structure is either too large, encroaching on indoor space, or too compact, causing the dimensions of functional areas such as cat beds, platforms, and jumping platforms to be reduced, failing to meet the basic needs of cats to stretch out, turn around, and curl up. Common manifestations include insufficient cat bed depth, too small platform area, thin pillar diameter, and unreasonable spacing between layers, seriously affecting comfort and safety.

[0004] 3. Due to the increased number of additional components and an unreasonable center of gravity design, the product is prone to wobbling or even tipping over when the cat jumps. Connections rely heavily on simple screws, plastic parts, or adhesives, which are susceptible to loosening and breakage under prolonged dynamic use. An insufficiently small base area or inadequate counterweight further weakens the overall structural stability, posing a safety hazard.

[0005] 4. Modular products are typically bulky and irregularly shaped, resulting in high packaging and transportation costs and increased susceptibility to damage. Users need to assemble a large number of parts themselves, a cumbersome process, and improper installation can easily lead to structural risks.

[0006] Therefore, there is an urgent need for a well-designed, safe, stable, flexibly adjustable, and easy-to-clean and maintain integrated cat bed and cat tree product to solve the above problems. Summary of the Invention

[0007] To address the technical problems in the background art, this invention discloses a snap-fit ​​modular cat house climbing frame.

[0008] This invention provides a snap-fit ​​modular cat bed climbing frame, comprising at least one basic unit main component; The basic unit main component consists of a rectangular frame structure enclosed by six plates, including: Two symmetrically arranged side panels extending vertically, each side panel has multiple scratching holes for cats to grip; Two symmetrically arranged opening panels extending vertically, each with a doorway for the cat to enter and exit; A horizontally arranged top slab and a horizontally arranged bottom slab; The interior space enclosed by the rectangular frame serves as a resting area or activity area for cats. in: The upper and lower edges of the side panels are respectively engaged with the top and bottom panels by interlocking with each other, and are positioned and fixed by means of mortise and tenon joints. The upper end of the opening plate is fixed to the top plate, and the lower end is fixed to the bottom plate by bolt assemblies. The horizontal sides of the opening plate and the horizontal sides of the side plate are locked and fixed by bolt assemblies; The basic unit also features a climbing structure to support the cat's vertical climbing and movement. Multiple basic unit components are stacked vertically by bolting to extend the height of the cat house climbing frame. Multiple basic unit main components abut against each other through the outer surfaces of adjacent side plates, enabling the cat house climbing frame to expand in parallel in the horizontal direction.

[0009] Furthermore, the climbing structure consists of climbing holes extending through the thickness direction on the top and bottom plates.

[0010] Furthermore, the climbing section is a climbing board that protrudes from the base plate along the extension direction of the side plate.

[0011] Furthermore, the climbing structure consists of climbing holes extending through the thickness direction on the top and bottom plates, and climbing boards protruding from the bottom plate along the extension direction of the side plates.

[0012] Furthermore, the two vertically adjacent climbing boards are arranged in a staggered manner.

[0013] Furthermore, in the vertical projection, the climbing boards overlap.

[0014] Furthermore, the upper end of the side plate is provided with a protruding plate, and the lower end is provided with a groove that conforms to the shape of the protruding plate; When the main components of the basic unit are spliced ​​together, the groove of the upper side plate engages with the protrusion of the lower side plate.

[0015] Furthermore, the snap-fit ​​structure between the side panel and the top panel is set as a first tenon-groove snap-fit ​​structure; The snap-fit ​​structure between the side plate and the bottom plate is set as a second tenon snap-fit ​​structure; The first and second mortise and tenon joint structures are offset from the vertical projection.

[0016] Furthermore, the upper and lower ends of the side plate are respectively provided with an outwardly extending, L-shaped first and second retaining plates; The first slot is formed between the first card plate and the side plate; The second slot is formed between the second card plate and the side plate; The first and second card slots open in the same horizontal direction; The top plate has L-shaped third retaining plates extending outwards on both sides; The third slot is formed between the third card plate and the top plate; The base plate has outward-extending, L-shaped fourth card plates on both sides; The fourth slot is formed between the fourth plate and the base plate; The third and fourth card slots open in the same horizontal direction, opposite to the opening direction of the first card slot.

[0017] Furthermore, the first card plate is disposed on the convex plate; The side of the second card plate facing away from the opening of the second card slot is coplanar with the groove wall.

[0018] The beneficial effects of this invention are: 1. By integrating the cat bed and resting area with the climbing structure into the basic unit, the functions of resting, climbing, patrolling, and hiding are organically combined, eliminating the problem of fragmented scenarios in traditional modular products. The modular expansion method (vertical stacking and horizontal parallel connection) can flexibly construct a three-dimensional space that conforms to the natural behavior chain of cats' rest and entertainment, meeting the dynamic needs of different growth stages, multiple cats living together, and family layouts.

[0019] 2. The basic unit adopts a standardized rectangular frame design, which is compact and has a regular internal space. It can ensure that the depth of the cat bed and the area of ​​the platform meet the basic needs of cats to stretch out and curl up. At the same time, the overall size can be flexibly adjusted through module combination to adapt to different family space conditions, avoiding the imbalance problem of traditional products that are "too large to take up space" or "too small to be cramped".

[0020] 3. The side panels, top panel, and bottom panel are joined using mortise and tenon joints and interlocking joints to form a self-positioning, torsional-resistant structure; the opening panels are reinforced with bolt assemblies, ensuring rigid fixation of key load-bearing components. This design, combined with a reasonable center of gravity distribution and modular stacking for balanced load-bearing, effectively suppresses the risk of swaying and tipping when the cat jumps. The connection structure is reliable and durable, overcoming the shortcomings of traditional screw and adhesive methods that are prone to loosening and breakage.

[0021] 4. Modular panels allow for flat packaging, significantly reducing transportation costs and the risk of damage. Users can complete assembly simply by plugging and bolting, without complicated tools, resulting in high installation efficiency and fewer errors. Each panel can be disassembled independently, facilitating localized cleaning, replacement, or reassembly, and minimizing long-term maintenance costs.

[0022] 5. Supports multiple expansion methods including vertical stacking and horizontal parallel connection. Users can freely combine basic units according to actual needs to achieve personalized customization of height, width, and functional layout. The modular design also facilitates the subsequent addition of accessories such as scaffolding platforms and hammocks, improving product adaptability and service life. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention; Figure 2 This is an exploded view of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 4 This is an exploded view of Embodiment 2 of the present invention; Figure 5 This is a structural schematic diagram of Embodiment 3 of the present invention; Figure 6 This is an exploded view of Embodiment 3 of the present invention; Figure 7 This is a structural schematic diagram of Embodiment 5 of the present invention; Figure 8 This is a schematic diagram of the structure of Embodiment Six of the present invention; Figure 9 This is a structural schematic diagram of Embodiment Seven of the present invention; Figure 10 This is a schematic diagram of the structure of Embodiment 8 of the present invention; Figure 11 This is a schematic diagram of the structure of Embodiment Nine of the present invention; In the diagram: 1. Basic unit main component; 2. Side plate; 3. Opening plate; 4. Top plate; 5. Bottom plate; 21. Scratch hole; 22. Protruding plate; 23. Groove; 24. First card plate; 25. Second card plate; 26. First card slot; 27. Second card slot; 31. Doorway; 41. Climbing hole; 42. Third card plate; 43. Third card slot; 51. Climbing board; 52. Fourth card plate; 53. Fourth card slot. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0026] Example 1: like Figure 1 and Figure 2As shown, this invention discloses a snap-fit ​​modular cat house climbing frame, which is a basic unit main component 1. The basic unit main component 1 is a rectangular frame structure formed by six plates, including two side plates 2, two opening plates 3, a top plate 4, and a bottom plate 5.

[0027] Side panels 2 are symmetrically arranged and extend vertically; opening panels 3 are also symmetrically arranged and extend vertically. Side panels 2 and opening panels 3 together form a rectangular cylindrical frame body. Top panel 4 and bottom panel 5 are connected to the upper and lower ends of the frame body respectively, sealing the openings at the upper and lower ends of the frame body. This allows the internal space of the basic unit main component 1 to form a cat resting area or internal activity area. By laying down a mat or cat bed cushion, the cat can rest; by removing the mat or cat bed cushion, the cat can scratch and climb inside.

[0028] The side panel 2 has multiple scratching holes 21 for cats to grip; the opening panel 3 has a doorway 31 for cats to enter and exit. The main component 1 of the basic unit also has a climbing structure to support cats to climb and move vertically. In this embodiment, the climbing structure is a climbing hole 41 that extends through the thickness of the top panel 4 and the bottom panel 5. The advantages of this design are: 1. The climbing hole 41 extends through the top panel 4 and the bottom panel 5, allowing cats to move up and down vertically naturally and smoothly through the hole, directly connecting the rest and play behavior chain. The cat resting area and the upper and lower activity spaces are organically connected through the hole, avoiding the problem of separation and interference between the resting area and the activity area in traditional designs, and realizing the true integration of the cat bed and climbing frame functions. 2. The climbing hole 41 is directly opened on the top panel 4 and the bottom panel 5 as part of the structure, without the need for additional cantilevered jump boards or external components, lowering the overall center of gravity and reducing the torque and swaying risk generated when the cat jumps. 3. The climbing holes 41 are a standardized design. When multiple basic unit main components 1 are stacked vertically, the climbing holes 41 of the upper and lower units naturally align, forming a continuous vertical climbing channel. This eliminates the need for additional connectors to adjust the climbing path when expanding the height, simplifies the stacking process, and allows for flexible adjustment of the vertical space layout according to the cat's growth or the needs of multiple cats living together.

[0029] The upper and lower edges of side plate 2 are respectively engaged with top plate 4 and bottom plate 5 via an interlocking method, and positioned and fixed by means of a tenon-and-groove interlocking structure. Specifically, side plate 2 has a protruding plate 22 at its upper end and a groove 23 that conforms to the protruding plate 22 at its lower end. When the main components 1 of the basic unit are assembled, the groove 23 of the upper side plate 2 engages with the protruding plate 22 of the lower side plate 2. The engagement of the protruding plate 22 and the conforming groove 23 automatically guides the side plates 2 to align when the main components 1 of the basic unit are stacked, ensuring the accuracy and consistency of the vertical assembly. This interlocking structure provides preliminary positioning and temporary fixation before bolt tightening, simplifying the assembly process and reducing installation errors. Through the protruding and recessed interlocking, a mechanical interlock is formed between the upper and lower side plates 2, effectively limiting relative displacement and torsion in the horizontal direction. This design distributes the load and force, improves the overall structural rigidity after multiple units are stacked, and reduces swaying caused by cat activity or jumping.

[0030] The mortise and tenon joint structure is as follows: The upper and lower ends of the side plate 2 are respectively provided with an outwardly extending, L-shaped first locking plate 24 and a second locking plate 25; the first locking plate 24 and the side plate 2 form a first locking groove 26; the second locking plate 25 and the side plate 2 form a second locking groove 27; the first locking groove 26 and the second locking groove 27 open in the same horizontal direction. The top plate 4 has outwardly extending, L-shaped third locking plates 42 on opposite sides; the third locking plates 42 and the top plate 4 form a third locking groove 43. The bottom plate 5 has outwardly extending, L-shaped fourth locking plates 52 on opposite sides; the fourth locking plates 52 and the bottom plate 5 form a fourth locking groove 53; the third locking groove 43 and the fourth locking groove 53 open in the same horizontal direction, opposite to the opening direction of the first locking groove 26. The first locking groove 26 engages with the third locking groove 43, and the second locking groove 27 engages with the fourth locking groove 53.

[0031] The first clamping plate 24 is disposed on the protruding plate 22; the side of the second clamping plate 25 facing away from the opening of the second clamping groove 27 is coplanar with the groove wall of the groove 23. With this arrangement, no collision will occur between the clamping plates when the basic unit main component 1 is spliced ​​up and down.

[0032] The upper end of the opening plate 3 is locked and fixed to the top plate 4 and the lower end is locked and fixed to the bottom plate 5 by bolt assemblies; the two sides of the opening plate 3 in the horizontal direction are locked and fixed to the two sides of the side plate 2 in the horizontal direction by bolt assemblies.

[0033] Compared to existing technologies, the advantages of this embodiment are: 1. By integrating the cat bed resting area and climbing structure into the basic unit main component 1, the functions of resting, climbing, patrolling, and hiding are organically combined, eliminating the scene fragmentation problem of traditional combined products. 2. The basic unit main component 1 adopts a standardized rectangular frame design, with a compact structure and regular internal space, ensuring that the depth of the cat bed and the platform area meet the basic needs of cats to stretch out and curl up. 3. The side panels 2, top panels 4, and bottom panels 5 are joined by mortise and tenon joints and plug-in joints to form a self-positioning anti-torsional structure; the opening panel 3 is reinforced by bolt assemblies, achieving rigid fixation of key stress points. This design, combined with a reasonable center of gravity distribution and balanced load-bearing capacity of modular stacking, effectively suppresses the risk of swaying and tipping when the cat jumps. The connection structure is reliable and durable, overcoming the defects of traditional screws and adhesives that are prone to loosening and breakage. 4. Modular panels can be flattened for packaging, significantly reducing transportation costs and the risk of damage. Users can complete the assembly simply by plugging in and tightening bolts, without the need for complicated tools, resulting in high installation efficiency and low error rates. Each panel can be disassembled independently, facilitating localized cleaning, replacement, or reassembly, and minimizing long-term maintenance costs.

[0034] Example 2: The difference compared to Example 1 is as follows: Figure 3 and Figure 4 As shown, the climbing part is a climbing board 51 that protrudes from the base plate 5 along the extension direction of the side plate 2. The climbing board 51 protrudes outward in the direction through the doorway 31, so that when the cat crawls out of the doorway 31, it can stand on the climbing board 51 and use it as a springboard to climb up and down.

[0035] Example 3: The difference compared to Example 1 is as follows: Figure 5 and Figure 6 As shown, the climbing section includes not only climbing holes 41 that penetrate the thickness direction of the top plate 4 and the bottom plate 5, but also climbing plates 51 that protrude from the bottom plate 5 along the extension direction of the side plate 2 in Embodiment 2.

[0036] Example 4: like Figure 7 As shown, this invention discloses a snap-fit ​​modular cat climbing frame, which is assembled from the basic unit main component 1 in Embodiment 1. When expanding by splicing the upper and lower parts, the groove 23 at the splicing point engages with the protrusion. The lower end of the side plate 2 in the upper basic unit main component 1 is provided with a through hole, and the upper end of the opening plate 3 in the lower basic unit main component 1 is provided with a threaded hole coaxial with the through hole. Bolts pass through the through holes and are threadedly connected to the threaded holes, thus connecting and fixing the upper and lower basic unit main components 1.

[0037] When expanding in parallel in the horizontal direction, the main component 1 of the basic unit abuts against each other through the outer surfaces of adjacent side plates 2.

[0038] In this embodiment, three columns of basic unit main components 1 are provided. The first column has two basic unit main components 1 spliced ​​vertically, the second column has three basic unit main components 1 spliced ​​vertically, and the third column has one basic unit main component 1.

[0039] The beneficial effects of the above configuration are: 1. The modular expansion method (vertical stacking and horizontal parallel connection) allows for flexible construction of a three-dimensional space that conforms to the natural behavioral chain of cats' rest and entertainment, meeting the dynamic needs of different growth stages, multiple cats living together, and family layouts. 2. Supporting multiple expansion methods of vertical stacking and horizontal parallel connection, users can freely combine basic units according to actual needs to achieve personalized customization of height, width, and functional layout. The modular design also facilitates the subsequent addition of accessories such as jumping platforms and hammocks, improving product adaptability and service life.

[0040] Example 5: The difference compared to Example 4 is as follows: Figure 8 As shown, the basic unit component 1 from Embodiment 2 is assembled into the structure. Two vertically adjacent climbing boards 51 are staggered. This staggered arrangement of the climbing boards 51 forms a non-aligned, stepped path in the vertical direction, better aligning with the natural behavior of cats, which prefer alternating footing when jumping. This design guides the cat to climb upwards along a zigzag or spiral path, making the climbing process more in line with its instincts and enhancing ease of use and enjoyment.

[0041] Example 6: The difference compared to Example 5 is as follows: Figure 9 As shown, in the vertical projection, the climbing board 51 overlaps. This arrangement increases the difficulty for the cat to climb up and down, which can train and improve the cat's agility.

[0042] Example 7: like Figure 10 As shown, this invention discloses a snap-fit ​​modular cat climbing frame, which is assembled from the basic unit main component 1 in Embodiment 3. Two vertically adjacent climbing boards 51 are arranged in a staggered manner.

[0043] Example 8: The difference from Example 7 is as follows: Figure 11 As shown, in the vertical projection, the climbing board 51 overlaps.

[0044] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A snap-fit ​​modular cat bed climbing frame, characterized in that: Includes at least one basic unit component (1); The basic unit main component (1) is a rectangular frame structure formed by six plates, including: Two symmetrically arranged side plates (2) extending vertically, each side plate (2) having multiple cat scratch holes (21) for cat paws to grasp; Two symmetrically arranged opening panels (3) extending vertically, each opening panel (3) having a doorway (31) for the cat to enter and exit; A horizontally arranged top plate (4) and a horizontally arranged bottom plate (5); The internal space enclosed by the rectangular frame constitutes a cat resting area or an internal activity area. in: The upper and lower edges of the side plate (2) are respectively engaged with the top plate (4) and the bottom plate (5) by interlocking in opposite directions, and are positioned and fixed by means of mortise and tenon joint structure; The upper end of the opening plate (3) is fixed to the top plate (4), and the lower end is fixed to the bottom plate (5) by bolt assemblies. The opening plate (3) is fixed to the side plate (2) on both sides in the horizontal direction by bolt assembly; The basic unit main component (1) is also provided with a climbing structure to support the cat to climb and move in the vertical direction; Multiple basic unit main components (1) are stacked vertically by means of bolt connection to realize the height expansion of the cat house climbing frame; Multiple basic unit main components (1) abut against each other through the outer surfaces of adjacent side plates (2), thereby realizing the parallel expansion of the cat house climbing frame in the horizontal direction.

2. The snap-fit ​​modular cat bed climbing frame according to claim 1, characterized in that: The climbing structure is a climbing hole (41) that penetrates the thickness direction on the top plate (4) and the bottom plate (5).

3. The snap-fit ​​modular cat bed climbing frame according to claim 1, characterized in that: The climbing part is a climbing board (51) that protrudes from the base plate (5) along the extension direction of the side plate (2).

4. The snap-fit ​​modular cat bed climbing frame according to claim 1, characterized in that: The climbing structure consists of climbing holes (41) extending through the thickness direction on the top plate (4) and the bottom plate (5), and climbing plates (51) protruding from the bottom plate (5) along the extension direction of the side plate (2).

5. The snap-fit ​​modular cat bed climbing frame according to claim 3 or 4, characterized in that: The two vertically adjacent climbing boards (51) are arranged in a staggered manner.

6. The snap-fit ​​modular cat bed climbing frame according to claim 3 or 4, characterized in that: In the vertical projection, the climbing board (51) overlaps.

7. The snap-fit ​​modular cat bed climbing frame according to claim 1, characterized in that: The upper end of the side plate (2) is provided with a protruding plate (22), and the lower end is provided with a groove (23) that conforms to the shape of the protruding plate (22). When the basic unit main component (1) is spliced ​​up and down, the groove (23) of the upper side plate (2) is engaged with the protrusion (22) of the lower side plate (2).

8. The snap-fit ​​modular cat bed climbing frame according to claim 7, characterized in that: The snap-fit ​​structure between the side plate (2) and the top plate (4) is set as a first tenon-groove snap-fit ​​structure; The snap-fit ​​structure between the side plate (2) and the bottom plate (5) is set as a second tenon-groove snap-fit ​​structure; The first and second tenon-groove locking structures are offset from the vertical projection.

9. The snap-fit ​​modular cat bed climbing frame according to claim 8, characterized in that: The upper and lower ends of the side plate (2) are respectively provided with an outwardly extending, L-shaped first clamping plate (24) and a second clamping plate (25); The first card plate (24) and the side plate (2) form a first card slot (26); The second card plate (25) and the side plate (2) form a second card slot (27); The first card slot (26) and the second card slot (27) open in the same direction along the horizontal direction; The top plate (4) is provided with outwardly extending, L-shaped third card plates (42) on opposite sides; The third card plate (42) and the top plate (4) form a third card slot (43); The base plate (5) has outwardly extending, L-shaped fourth card plates (52) on opposite sides; The fourth card slot (53) is formed between the fourth card plate (52) and the bottom plate (5); The third slot (43) and the fourth slot (53) open in the same direction in the horizontal direction, and their opening direction is opposite to that of the first slot (26).

10. The snap-fit ​​modular cat bed climbing frame according to claim 9, characterized in that: The first card plate (24) is disposed on the protruding plate (22); The side of the second card plate (25) facing away from the opening of the second card slot (27) is coplanar with the groove wall of the groove (23).