A zero-glue full disassembly linkage soft bed

Abstract

The application discloses a zero-glue full disassembly linkage soft bed, which comprises a modular solid wood mortise and tenon self-locking base frame, a sliding seat frame with dustproof sliding rails, a driving mechanism, a double-link backrest folding assembly with mechanical locking, a glue-free detachable soft bag and a through type moisture-proof and air-permeable structure. The base is made of solid wood profiles which are matched with dovetail tenon and replaceable wedge-shaped plastic insert buckles for pure mechanical assembly without glue bonding. The driving mechanism is a 24V electric push rod or a manual push-pull positioning and locking mechanism. The driving seat frame moves forward, and the backrest is synchronously folded and laid flat through symmetric double-link pulling. The space required for backrest folding is offset by the forward stroke of the seat body, so that the opening and closing of the bed with zero gap against the wall is realized. The double-link is provided with spring positioning pin type mechanical locking, and the double-link is locked in upright and flat positions. The soft bag is positioned by using a zipper-magic tape-insert buckle composite, and can be fully disassembled for inspection. The profiles are provided with through flow guide grooves, and the base is suspended to form a convection air duct. The whole bed can be disassembled by hand, and the damaged parts can be replaced, and is suitable for KD spare part export.

Description

Technical Field

[0001] This invention relates to the field of furniture structure design technology, specifically to a solid wood upholstered bed structure that features zero glue, complete disassembly and assembly, zero wall-mounted linkage folding, and compatibility with both electric and manual drive. Background Technology

[0002] Existing upholstered beds and multifunctional sofa beds generally suffer from the following structural defects: First, the industry widely uses spray adhesives, wood glues, and splicing adhesives, which have a slow release period of formaldehyde and TVOC for several years. Long-term use in the closed environment of a bedroom poses health risks.

[0003] Secondly, traditional upholstered bed frames are glued and fixed, making them non-removable. This makes it difficult to move large items into homes, resulting in high logistics costs and hindering the export of KD (knock-down) parts. Many detachable products use metal bolts for connection; repeated disassembly and reassembly cause wear and tear on the wooden holes, leading to loose and irreparable connections.

[0004] Third, most folding sofa beds on the market use a backrest that flips backward, which requires a 15-30cm gap to be left behind, making it impossible to place them against the wall in small apartments; some competing products have directly removed the electric mechanism and replaced it with manual one to circumvent patent protection.

[0005] Fourth, solid wood bed frames are poorly ventilated and prone to dampness and mold, and are susceptible to cracking due to thermal expansion and contraction caused by temperature and humidity changes; traditional mortise and tenon joints become worn and gaps widen after repeated disassembly and assembly, and the glued structure cannot be repaired, so partial damage can only result in the entire bed being scrapped.

[0006] Fifth, the linkage folding mechanism lacks a reliable mechanical lock, and there is a risk of accidental tipping and injury when the backrest is turned off or in manual mode; the slide rail is prone to accumulating cotton lint and dust, causing jamming and abnormal noise.

[0007] The existing technology lacks a universal solid wood upholstered bed structure that features: full-structure glue-free mechanical assembly, complete manual disassembly, forward compensation for zero-wall folding, compatibility with both electric and manual modes, individual replacement of vulnerable parts, and efficient moisture-proof and ventilation properties. Summary of the Invention

[0008] (a) Purpose of the invention Overcoming the shortcomings of existing technologies such as glue pollution, difficult disassembly and assembly, occupation of rear space, easy manual modification and avoidance, irreparable wear and tear on mortise and tenon joints, safety hazards, and susceptibility to moisture damage in solid wood, this invention provides a universal, fully disassembled, glue-free, environmentally friendly, zero-gap wall-mounted opening and closing mechanism with both electric and manual drive, replaceable vulnerable parts, and compatibility with various solid wood materials for a linked upholstered bed structure. (II) Technical Solution

[0009] This invention provides a glue-free, fully detachable and interconnected upholstered bed, comprising: a base frame assembly, a horizontal sliding seat frame, a drive mechanism, a backrest flipping assembly, a modular upholstered assembly, and a moisture-proof and breathable structure.

[0010] The base frame assembly is physically assembled from several standard unit modules of solid wood profiles using dovetail joints and replaceable wedge-shaped plastic self-locking inserts, without the use of any glue. The dovetail joints provide positioning and guidance, while the wedge-shaped plastic inserts lock into the mortise and tenon joint gaps. These wedge-shaped plastic inserts are independent and replaceable; friction and wear during assembly and disassembly are absorbed by the plastic inserts, preventing wear on the solid wood mortise and tenon joint itself. Wearing inserts can be replaced individually to restore the fit and precision, solving the problem of loosening and failure caused by repeated assembly and disassembly of the solid wood mortise and tenon joints. A 0.5-1.2mm allowance for thermal expansion and contraction is provided on each side of the mortise and tenon joint to prevent stress cracking caused by temperature and humidity changes. The base frame assembly can be disassembled into multiple independent unit modules, each no longer than 1.2m, suitable for KD (knock-down) component assembly and entry into confined spaces.

[0011] The horizontal sliding seat is slidably mounted on the horizontal slide rail assembly above the base frame assembly; the slide rail assembly is equipped with a dustproof edge, which covers the outside of the slide rail and moves synchronously with the sliding seat to prevent lint and dust from entering the slide rail; the sliding seat is equipped with glue-free snap-on rubber buffer limit blocks at both ends of the stroke to eliminate rigid impact at the end of the stroke.

[0012] The drive mechanism is located between the base frame assembly and the sliding bracket, driving the sliding bracket to move back and forth as a whole. Either of these two configurations is available. Electric mode: It adopts a 24V silent linear electric actuator. One end of the actuator is hinged to the front crossbeam of the base, and the other end is hinged to the bottom of the front end of the sliding seat. The hinge part is embedded with a metal threaded insert, and the hinge pin is equipped with an anti-drop-off retaining spring. The actuator circuit is equipped with a current detection module. It automatically cuts off the power when the resistance exceeds the threshold, realizing overload protection when encountering resistance and preventing pinching and damage to the mechanism.

[0013] Manual mode: Employs a manual push-pull positioning and locking mechanism, including an operating handle at the front of the sliding base, at least two positioning slots on the side beam of the base, and a spring-loaded pin connecting the handle and the slots. Pushing or pulling the handle moves the base horizontally; once in position, the spring-loaded pin automatically engages with the positioning slot to lock. The manual module and electric module have identical installation interfaces, allowing for interchangeability without replacing other parts, thus blocking the path to patent circumvention by removing the motor.

[0014] The backrest flipping assembly includes a backrest frame and symmetrically arranged double-link mechanisms on both sides of the sliding seat frame. Each double-link mechanism includes an upper link and a lower link. The upper end of the upper link is hinged to the middle of the backrest frame, and the upper end of the lower link is hinged to the lower part of the backrest frame. The lower ends of the upper and lower links are respectively hinged to different height positions at the rear of the sliding seat frame, forming a four-bar linkage mechanism. The length ratio of the upper link to the lower link is 1:1.2-1:1.5; the initial angle between the upper link and the horizontal plane is 35°-55°, and the initial angle between the lower link and the horizontal plane is 30°-50°. When the sliding seat frame moves forward, the double links drive the backrest frame to fold downward and lay flat. The forward movement of the seat frame compensates for the backrest flipping space, achieving zero-gap opening and closing of the bed frame against the wall.

[0015] The double-link mechanical locking mechanism includes a spring positioning pin, an upright positioning hole, and a flat positioning hole on the sliding seat side plate. The spring positioning pin is connected to a manual unlocking lever on the outside of the backrest via a cable. When the backrest is in upright use, the spring positioning pin is inserted into the upright positioning hole to lock and prevent the backrest from tilting backward. When the backrest is in flat use, the spring positioning pin is inserted into the flat positioning hole to lock and prevent the backrest from accidentally springing up. When switching positions, pulling the unlocking lever releases the spring positioning pin from the positioning hole to unlock, and then the drive mechanism completes the position switching. The dual-position mechanical locking eliminates the safety hazard of the backrest tilting and pinching the user during power outages or in manual mode.

[0016] The modular soft-pack assembly includes separate seat cushion soft packs and backrest soft packs; the soft packs are sewn together without adhesive bonding between the fabric and the filling; the fabric features a fully enclosed invisible zipper, with multiple Velcro fasteners and high-strength quick-release buckles on the inside; it adopts a triple-layer positioning assembly of zipper covering the frame, Velcro fastening and positioning, and buckle locking, allowing for complete disassembly to inspect the internal filling material, and is not prone to displacement or falling off with long-term use, eliminating the use of adhesive in the interlayer and inferior filling materials.

[0017] Moisture-proof and breathable structure: The solid wood profiles are made of hollow square tubes or grooved square timber; the side walls of the profiles have ventilation channels running along the length, and the bottom of the crossbeams has ventilation channels; a 2-5mm ventilation gap is maintained between the modules; the base is suspended 6-10cm off the ground and equipped with multi-position buckle feet with 2-3 height adjustment holes; a removable moisture-proof and insect-proof pad is embedded in the bottom slot of the base, and the pad can be removed, dried, and replaced; the combination forms a through-flow ventilation layer to improve the problems of moisture, mold, and cracking of solid wood.

[0018] The independent claims of this invention cover various solid wood materials, with kiln-dried pine wood as a preferred material, but are not limited to a single type of wood; the whole machine supports KD disassembly of parts, and vulnerable parts can be replaced individually, making it suitable for various scenarios such as home use, homestay projects, and cross-border exports. (III) Beneficial Effects

[0019] All-structure zero-adhesive environmental protection: All connections are mechanically assembled, without glue, reducing formaldehyde and TVOC release, and meeting the environmental protection requirements for use by mothers and babies.

[0020] Dual-drive mode enhances protection: The interfaces of the electric and manual drive modules are interchangeable, blocking the bypass path of competitors that directly cancel the motor.

[0021] Zero wall contact saves indoor space: The seat frame is moved forward to compensate for the folding travel, allowing it to be placed against the wall, which is suitable for small apartments.

[0022] Replaceable vulnerable parts reduce total lifecycle costs: Locking wear is concentrated on plastic inserts, leaving solid wood tenons undamaged; buckles and buffers can be replaced individually; the entire machine can be disassembled and assembled by hand, and the KD (knock-down) parts mode reduces logistics, warehousing, and after-sales costs, making it suitable for standardized export shipments.

[0023] Safe and reliable to use: dual-position spring pin mechanical locking, dustproof slide rail, stroke buffer, push rod interrupted by power interruption, solving the problems of tipping and pinching injury, jamming and abnormal noise.

[0024] Stable operation with well-matched mechanism parameters: 24V silent push rod, limited linkage angle ratio, dustproof slide rail, smooth and low-noise operation.

[0025] Through-flow ventilation and moisture prevention: Suitable for the high humidity environment in the south, reducing the problem of mold and cracking in solid wood.

[0026] High versatility: It can be adapted to various solid woods such as pine, oak, beech, and rubberwood; standardized unit modules can be quickly combined to generate various bed width specifications. (iv) Specific Implementation Examples

[0027] The base and backrest frame are made of kiln-dried pine with a moisture content of 8%-12%; the unit module base is assembled with dovetail tenons and replaceable wedge-shaped plastic inserts; it is driven by a 24V silent electric push rod, which is hinged to the front crossbeam of the base and the bottom of the front end of the sliding seat; the length ratio of the upper and lower connecting rods is 1:1.3, the initial hinge angle of the upper connecting rod is 45°, and the initial hinge angle of the lower connecting rod is 40°; it has a spring positioning pin and a locking mechanism with upright / flat positioning holes, and a cable connection to the outer unlocking lever; the slide rail is equipped with dustproof edge guards and rubber buffer limiters at both ends; the push rod current detection automatically cuts off power when encountering resistance; the gap between the backrest and the wall is 0 when upright; the soft padding uses a triple-layer positioning system of zipper-Velcro-quick buckle; the base is suspended 8cm high, and the base slot is equipped with a removable moisture-proof and insect-proof pad; the whole machine can be disassembled by hand, the unit module length is ≤1.2m, and vulnerable parts can be replaced individually.

[0028] The profile specifications are moderately thinned while retaining all core components: glue-free unit mortise and tenon assembly, forward-moving zero-wall-adhesion folding of the base frame, spring positioning pin double-position locking, dustproof and buffering sliding rails, and through-ventilation and moisture-proofing; the base is 6cm off the ground; suitable for small apartments with elevator access and bulk purchases by homestays.

[0029] Solid wood unit modules, hardware, soft packaging, and vulnerable parts are all separated and individually packaged; the parts are equipped with a foolproof assembly structure; the unit module length is no more than 1.2m, which is convenient for container packing; vulnerable buckles, buffer blocks, and moisture-proof pads are individually packaged, and accessories replacement instructions are included, supporting overseas users to assemble themselves.

[0030] The electric push rod is eliminated; an operating handle is installed at the front end of the sliding seat, and two positioning slots for storage and unfolding are set on the side beam of the base. The spring pin cooperates with the handle to lock the seat; the work position is locked by relying on the double linkage spring positioning pin; the rest of the frame, slide rail, soft package, and ventilation structure are consistent with Example 1; the installation interface of manual drive and electric drive is universal, and the parts can be interchanged. (v) Description of the attached drawings

[0031] Appendix Figure 1 : Overall structural diagram of the bed in its folded state. Labels: 1. Base frame assembly; 2. Sliding seat frame; 3. Drive mechanism; 4. Backrest frame; 5. Backrest upholstery; 6. Seat cushion upholstery; 7. Elevating feet; 8. Slide rail assembly; 9. Double linkage mechanism.

[0032] Appendix Figure 2 : Bed frame unfolded and laid flat structure diagram. Notes: Backrest frame 4 in the unfolded position, upper connecting rod 91, lower connecting rod 92, and spring positioning pin 93 inserted into the unfolded positioning hole 94.

[0033] Appendix Figure 3 Enlarged view of the dovetail tenon replaceable wedge-shaped plastic insert. Notes: Dovetail tenon 11, wedge-shaped plastic insert 12, insertion direction 13, locking position 14, expansion / contraction clearance 15.

[0034] Appendix Figure 4 Diagram of translation drive + double linkage with locking transmission structure. Labels: Upper linkage 91, Lower linkage 92, Upper linkage upper hinge point 911, Upper linkage lower hinge point 912, Lower linkage upper hinge point 921, Lower linkage lower hinge point 922, Vertical positioning hole 95, Flat positioning hole 94, Spring positioning pin 93, Cable 96, Unlocking lever 97, Electric push rod 31, Push rod front hinge point 311, Push rod rear hinge point 312.

[0035] Appendix Figure 5 : Schematic diagram of the adhesive-free composite positioning detachable soft pouch structure. Notes: Invisible zipper 51, Velcro 52, Quick snap 53, Stitching 54, Inner side of the soft pouch 55.

[0036] Appendix Figure 6 : Schematic diagram of manual push-pull positioning and locking mechanism. Labels: Operating handle 32, spring pin 33, positioning slot 34a (storage station), positioning slot 34b (expansion station), slide rail assembly 8, buffer limit block 81, dustproof edge 82.

[0037] Appendix Figure 7Partial schematic diagram of the base frame of the through-type ventilation channel. Labels: Front and rear through-type airflow channel 16, bottom ventilation channel 17, splicing ventilation gap 18, moisture-proof and insect-proof pad slot 19, heightening foot stop hole 71.

Claims

1. A glue-free, fully detachable, interconnected soft bed, characterized in that, include: The base frame assembly is formed by mechanically splicing multiple solid wood profiles together with mortise and tenon joints and replaceable self-locking buckles. Each splicing node does not contain any glue connection. The self-locking buckle is a wedge-shaped plastic insert that is embedded in the gap of the mortise and tenon joint to achieve locking. A horizontal sliding bracket is slidably mounted on a transverse slide rail assembly above the base frame assembly. A drive mechanism is provided between the base frame assembly and the sliding bracket, and the drive mechanism drives the sliding bracket to move back and forth along the slide rail assembly as a whole. The backrest flipping assembly includes a backrest frame and parallel double-link mechanisms symmetrically arranged on both sides of the sliding seat frame. Each double-link mechanism includes an upper link and a lower link. The upper end of the upper link is hinged to the middle of the backrest frame, and the upper end of the lower link is hinged to the lower part of the backrest frame. The lower ends of the upper and lower links are respectively hinged to different height positions at the rear of the sliding seat frame, forming a four-bar linkage mechanism. When the sliding seat frame moves forward, the double-link mechanism pulls the backrest frame downward to flip and lay flat, so that the forward movement of the seat body offsets the rear space occupied by the backrest flipping, realizing zero-gap opening and closing of the bed against the wall. The double-link mechanism is equipped with a mechanical locking mechanism, which includes a spring positioning pin and an upright positioning hole and a flat positioning hole set on the side plate of the sliding seat frame. When the backrest frame is in the upright position, the spring positioning pin is inserted into the upright positioning hole; when the backrest frame is in the flat position, the spring positioning pin is inserted into the flat positioning hole. Modular soft-pack components include separate seat cushion soft packs and backrest soft packs. The soft packs are formed by sewing and are detachably assembled to the outside of the frame using a composite positioning of zippers, Velcro, and buckles. There is no adhesive layer between the soft packs and the frame. The structure is moisture-proof and breathable. The solid wood profile has a front and rear through-flow ventilation channel on the side wall. Ventilation gaps are reserved between each assembled component. The bottom of the base is suspended and has a convection ventilation layer.

2. The zero-glue, fully detachable, interconnected soft bed according to claim 1, characterized in that: The driving mechanism is a linear electric push rod, one end of which is hinged to the front crossbeam of the base frame assembly, and the other end is hinged to the bottom front end of the sliding seat. When the push rod extends or retracts, it pushes the sliding seat to move back and forth. Alternatively, the driving mechanism is a manual push-pull positioning and locking mechanism, including an operating handle located at the front end of the sliding seat, at least two positioning slots fixed on the side beam of the base frame, and a spring pin connecting the operating handle and the positioning slots. After the operating handle is pushed or pulled to move the sliding seat to the target position, the spring pin automatically engages with the corresponding positioning slot to lock it.

3. The zero-glue, fully detachable, interconnected soft bed according to claim 1, characterized in that: The base frame assembly is assembled from several independent standard unit modules using mortise and tenon joints. Adjacent unit modules are positioned and locked together by dovetail tenons and wedge-shaped plastic inserts. The wedge-shaped plastic inserts are independent and replaceable parts, and the wear and tear during disassembly and assembly is borne by the plastic inserts, while the solid wood mortise and tenon body is not subject to wear.

4. The zero-glue, fully detachable, interconnected soft bed according to claim 1, characterized in that: The main material of the base frame assembly and the backrest frame is dried pine wood, with the moisture content of the pine wood controlled at 8%-12%. The mortise and tenon structure has a 0.5-1.2mm allowance for thermal expansion and contraction of solid wood on one side.

5. The zero-glue, fully detachable, interconnected soft bed according to claim 1, characterized in that: The mortise and tenon structure is a dovetail tenon interlocking structure. The transverse slide rail assembly is equipped with a dustproof edge, which covers the outside of the slide rail and moves synchronously with the sliding frame. The sliding frame is equipped with glue-free snap-on rubber buffer limit blocks at both ends of its front and rear travel.

6. The zero-glue, fully detachable, interconnected soft bed according to claim 2, characterized in that: The linear electric actuator is a 24V silent electric actuator. A metal threaded insert is pre-embedded at the hinge position of the actuator, and the hinge pin is equipped with an anti-dislodgement snap ring. The actuator control circuit is equipped with a current detection module, which automatically cuts off the power and stops the machine when the actuator running resistance exceeds a preset threshold.

7. The zero-glue, fully detachable, interconnected soft bed according to claim 1, characterized in that: The length ratio of the upper connecting rod to the lower connecting rod is 1:1.2-1:1.5, the initial hinge angle between the upper connecting rod and the horizontal plane is 35°-55°, and the initial hinge angle between the lower connecting rod and the horizontal plane is 30°-50°. The spring positioning pin is connected to the manual unlocking lever on the outside of the backrest frame via a cable. When the unlocking lever is pulled, the spring positioning pin disengages from the positioning hole to unlock the backrest.

8. The glue-free, fully detachable, interconnected soft bed according to claim 1, characterized in that: The soft bag features a fully concealed zipper, with multiple Velcro straps and high-strength quick-release buckles on the inside. The soft bag is assembled using a triple-layer positioning system: zipper covering the frame, Velcro fastening, and buckle locking. It can be completely disassembled to inspect the internal materials.

9. The zero-glue, fully detachable, interconnected soft bed according to claim 1, characterized in that: The solid wood profile is a hollow square tube or a grooved square timber. The side wall has a front and rear ventilation channel that runs through the length direction. The bottom of the crossbeam has a bottom ventilation channel. The splicing gap retains a 2-5mm air passage. The base is equipped with a snap-on detachable moisture-proof and insect-proof pad. The moisture-proof and insect-proof pad is embedded in the slot at the bottom of the base and can be removed for replacement or airing.

10. A glue-free, fully detachable, interconnected soft bed according to claim 1, characterized in that: All load-bearing components of the entire bed can be disassembled and removed by hand. The base frame can be disassembled into multiple independent unit modules, each unit module being no more than 1.2m in length, suitable for KD export parts disassembly and handling in confined spaces; easily damaged buckles and buffer limit blocks can be replaced individually.

11. A glue-free, fully detachable, interconnected soft bed according to claim 1, characterized in that: The base is suspended 6-10cm off the ground and is equipped with multi-position snap-on height adjustment feet. The height adjustment feet have 2-3 height adjustment holes, which, together with the ventilation grooves through the profile, form an upper and lower convection air duct to prevent the solid wood from getting damp, moldy, cracked and deformed in the sealed environment.

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