Steel-wood entry door with child and adult lock

Abstract

The utility model discloses a kind of steel wood house entry child-mother door, it includes door frame and door leaf, the door frame outside is connected with wall body through expansion bolt, the door leaf includes child door and mother door, the child door and the mother door are connected with the door frame inside through multiple hidden hinges, the both sides of the expansion bolt are provided with reinforcing rib. Through the combination of "reinforcing rib" and "internal reinforcement hidden hinge", it provides far more than normal support for heavy mother door side, while child door side also obtains equivalent reinforcement, so as to realize the stress balance of door frame whole, and the unique arc link structure in hidden hinge changes the direction of force, avoids force directly and roughly acting on the mounting point of hidden hinge, realizes "force relief" effect. This makes the impact and fatigue stress borne by hidden hinge itself and its connecting point with door frame and door leaf greatly reduce. Effectively prevent the problems of door frame distortion, door leaf droop, close not tight and the like caused by long-term uneven stress.

Description

Technical Field

[0001] This utility model relates to the field of entrance door technology, specifically to a steel-wood entrance door with a mother door and daughter door. Background Technology

[0002] A double-leaf door is a special type of double-door door, consisting of a smaller door leaf (the smaller door) and a larger door leaf (the larger door). It's typically used when the doorway is wide, and for aesthetic reasons, the doors are designed in a large-small, mother-and-child configuration. For everyday use, only the larger door needs to be opened; when large objects like furniture need to pass through, the entire door can be opened. This design maintains both aesthetics and practicality.

[0003] Existing double doors are divided into solid wood and composite structures. Composite structures mainly include a door frame and door panels, with the door panels consisting of a core and a decorative material covering the outer surface of the core. Steel-wood composite doors are a new type of door made by combining a one-time pressed steel plate with a solid wood frame and internal filler. Their door frames are generally connected to the wall using expansion bolts. Double doors, due to the different sizes and weights of the two door panels, place higher demands on the load-bearing balance of the door frame and the load-bearing capacity of the concealed hinges. Utility Model Content

[0004] The purpose of this utility model is to provide a steel-wood entrance door with a mother and daughter door to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides a steel-wood entrance door with a door frame and a door leaf. The outer side of the door frame is connected to the wall by expansion bolts. The door leaf includes a child door and a mother door. Both the child door and the mother door are connected to the inner side of the door frame by multiple concealed hinges. Reinforcing ribs are provided on both sides of the expansion bolts. The two ends of the reinforcing ribs are respectively connected to the door frame and the wall. The door frame is hollow inside. The concealed hinge includes a fixed hinge plate, a movable hinge plate, a hinge shell, a pivot pin, and a connecting rod. The fixed hinge plate is detachably installed on the inner side of the door frame. The movable hinge plate is detachably installed on the outer side of the child door or the mother door. The hinge shell is located inside the door frame and is connected to the fixed hinge plate. The pivot pin is located inside the hinge shell and is rotatably connected to the hinge shell. The connecting rod is arc-shaped to adapt to the hinge shell, and its two ends are respectively connected to the pivot pin and the movable hinge plate.

[0006] Furthermore, both ends of the sub-door and the mother door are provided with edge sealing, which is a frame structure. The edge sealing located at the outer end of the sub-door or the mother door connects the movable leaf plate and the corresponding sub-door or the mother door.

[0007] Furthermore, the fixed leaf plate is connected to the door frame by a first screw, and multiple edge bandings are connected to the child door or the mother door by fixing bolts. The two edge bandings located at the outer ends of the child door and the mother door are respectively connected to the corresponding movable leaf plate by a second screw.

[0008] Furthermore, both the sub-door and the mother door include a steel plate body, a fireproof door core, and multiple layers of wooden boards. The steel plate body is hollow inside, the fireproof door core is installed in the steel plate body, and there are two multiple layers of wooden boards, which are respectively installed on both sides of the steel plate body.

[0009] Furthermore, the middle part of the edge banding corresponds to the steel plate box body, and the two sides of the edge banding are used to fix the multi-layer wooden board. The multi-layer wooden board includes a base plate and a shaping frame. The base plate is installed on the steel plate box body, and the shaping frame is multiple and evenly distributed on the base plate.

[0010] Furthermore, both the sub-door and the mother door include multiple steel frames, which are installed in the steel plate housing for fixing and supporting the steel plate housing and the fireproof door core. The threaded ends of the second screw and the fixing bolt are respectively threadedly connected to the corresponding steel frame.

[0011] Furthermore, both the inner side of the fixed page plate and the outer side of the movable page plate are provided with cover plates.

[0012] Furthermore, a reinforcing plate is also provided in the steel plate box body. The reinforcing plate is located inside the outermost steel frame, and the threaded end of the second screw is threadedly connected to the reinforcing plate.

[0013] Furthermore, the connecting rod is connected to the movable leaf plate via a reinforcing block.

[0014] The beneficial effects of this utility model are as follows: By combining "reinforcing ribs" and "internal reinforced concealed hinges," this utility model provides significantly greater support to the heavy main door side than conventional methods, while simultaneously reinforcing the secondary door side. This achieves overall stress balance in the door frame. Furthermore, the unique arc-shaped connecting rod structure within the concealed hinges alters the direction of force, preventing direct and forceful application to the hinge's mounting points, thus achieving a "stress-relieving" effect. This significantly reduces the impact and fatigue stress on the concealed hinges themselves and their connection points with the door frame and door leaf. It effectively prevents problems such as door frame distortion, door leaf sagging, and incomplete closure caused by long-term uneven stress. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the elevation structure of an embodiment of the present utility model.

[0016] Figure 2This is a cross-sectional structural diagram of an embodiment of the present utility model.

[0017] Figure 3 This is a partial cross-sectional structural diagram of an embodiment of the present utility model.

[0018] Figure 4 This is a three-dimensional structural diagram of the concealed hinge in use according to an embodiment of this utility model.

[0019] Figure 5 This is a front view structural diagram of the concealed hinge in use according to an embodiment of the present invention.

[0020] The components include: 1. Door frame; 2. Door leaf; 3. Expansion bolts; 4. Concealed hinges; 5. Reinforcing ribs; 6. Edge banding; 7. Fixing bolts; 8. Steel frame; 9. Reinforcing plate; 10. Integrated automatic concealed latch; 11. Combination lock; 12. Stainless steel anti-pry pin.

[0021] 21. Sub-door; 22. Main door; 23. Steel plate body; 24. Fireproof door core; 25. Multi-layer wood panel; 41. Fixed leaf plate; 42. Movable leaf plate; 43. Hinge housing; 44. Shaft pin; 45. Connecting rod; 46. First screw; 47. Second screw; 48. Cover plate; 49. Reinforcing block.

[0022] 251. Base plate; 252. Shape frame. Detailed Implementation

[0023] 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 one embodiment of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] To make the objectives, technical solutions and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0025] In the following description, references to "an embodiment," "an embodiment," "an example," "example," etc., indicate that the described embodiment or example may include a particular feature, structure, characteristic, property, element, or limitation, but not every embodiment or example necessarily includes that particular feature, structure, characteristic, property, element, or limitation. Furthermore, the repeated use of the phrase "an embodiment according to this application," while possibly referring to the same embodiment, does not necessarily refer to the same embodiment.

[0026] like Figures 1-5As shown, this utility model discloses a steel-wood entrance door 22, which includes a door frame 1 and a door leaf 2. The outer side of the door frame 1 is connected to the wall by expansion bolts 3. The door leaf 2 includes a child door 21 and a mother door 22. Both the child door 21 and the mother door 22 are connected to the inner side of the door frame 1 by multiple concealed hinges 4. Reinforcing ribs 5 are provided on both sides of the expansion bolts 3. The two ends of the reinforcing ribs 5 are respectively connected to the door frame 1 and the wall. The door frame 1 is hollow inside. The concealed hinges 4 include a fixed hinge plate 41, a movable hinge plate 42, and a hinge. The hinge housing 43, hinge pin 44, and connecting rod 45 are configured. The fixed hinge plate 41 is detachably installed inside the door frame 1, while the movable hinge plate 42 is detachably installed inside the child door 21 or the mother door 22. The hinge housing 43 is located inside the door frame 1 and connected to the fixed hinge plate 41. The hinge pin 44 is located inside the hinge housing 43 and rotatably connected to it. The connecting rod 45 is arc-shaped to match the hinge housing 43, and its two ends are connected to the hinge pin 44 and the movable hinge plate 42, respectively. In this embodiment, the child door 21 and the mother door 22 are connected by an integrated automatic concealed latch 10, and the mother door 22 is equipped with a combination lock 11. Stainless steel anti-pry pins 12 are provided between the child door 21 and the door frame 1, and between the mother door 22 and the door frame 1.

[0027] The door frame 1 is initially fixed to the wall using expansion bolts 3. Reinforcing ribs 5 (usually high-strength metal plates) are added to both sides of each expansion bolt 3, with their ends firmly connected to the door frame 1 and the wall. When the weight of the door leaf 2 (especially the heavy main door 22) continuously acts on the door frame 1, the reinforcing ribs 5 effectively distribute this static load across a larger area of ​​the wall, rather than leaving the expansion bolts 3 to bear it alone. This forms a stable triangular support structure, greatly enhancing the door frame 1's resistance to sinking.

[0028] When door leaf 2 is closed, its immense weight is transferred to the curved connecting rod 45 via the movable leaf plate 42. The curved connecting rod 45 converts the downward force of gravity, through the pivoting action of the pivot pin 44, into pressure and tension on the hinge housing 43 and the fixed leaf plate 41. This design cleverly transforms and disperses the vertical force into the horizontal force. Ultimately, all the force is transferred through the fixed leaf plate 41 to the internal cavity structure of the entire door frame 1. Because the door frame 1 is hollow internally, this force is diffused and absorbed within its three-dimensional structure. Simultaneously, both the fixed leaf plate 41 and the movable leaf plate 42 are concealed within the door frame 1 and door leaf 2, making them completely hidden and invisible when the door is closed, resulting in a neat and aesthetically pleasing appearance.

[0029] This invention, through the combination of "reinforcing rib 5" and "internal reinforced concealed hinge 4," provides significantly enhanced support to the heavy main door 22 side, while the secondary door 21 side receives equal reinforcement. This achieves overall stress balance in the door frame 1. Furthermore, the unique arc-shaped connecting rod 45 structure within the concealed hinge 4 alters the direction of force, preventing direct and forceful application to the hinge 4's mounting point, thus achieving a "stress-relieving" effect. This significantly reduces the impact and fatigue stress on the concealed hinge 4 itself and its connection points with the door frame 1 and door leaf 2. It effectively prevents problems such as door frame 1 twisting, door leaf 2 sagging, and incomplete closure caused by long-term uneven stress.

[0030] In one embodiment, both ends of the sub-door 21 and the main door 22 are provided with edge banding 6. The edge banding 6 is a frame structure, and the edge banding 6 located at the outer end of the sub-door 21 or the main door 22 connects the movable leaf plate 42 and the corresponding sub-door 21 or main door 22. That is, in this embodiment, the movable leaf plate 42 is installed inside the frame structure of the edge banding 6. The edge banding 6 of the frame structure is firmly combined with the main body of the door leaf 2, which is equivalent to installing a sturdy "frame" for the door leaf 2, greatly enhancing the overall rigidity and resistance to torsion and deformation of the door leaf 2, and providing an extremely stable and reliable installation foundation for the movable leaf plate 42.

[0031] In one embodiment, the fixed leaf plate 41 is connected to the door frame 1 by a first screw 46, and the two sealing edges 6 located at the outer ends of the sub-door 21 and the mother door 22 are respectively connected to the corresponding movable leaf plate 42 and door leaf 2 by a second screw 47. The multiple sealing edges 6 are all connected to the sub-door 21 or the mother door 22 by fixing bolts 7.

[0032] In this embodiment, an installation opening is provided on the inner side of the door frame 1. The threaded end of the first screw 46 is located inside the door frame 1 and passes through the door frame 1 and the fixed leaf plate 41 in sequence. The nut end of the first screw 46 contacts the door frame 1. The connecting rod 45 rotates into or out of the hinge housing 43 through this installation opening. All edge banding 6 is first connected to the corresponding child door 21 or mother door 22 by fixing bolts 7, and then the nut end of the second screw 47 passes through the corresponding edge banding 6 and the movable leaf plate 42 inside the edge banding 6 in sequence.

[0033] The design of the first screw 46 and the second screw 47 means that the door leaf 2 is separable from the movable hinge 42, and the fixed hinge 41 is separable from the door frame 1. The position of the door leaf 2 can be precisely adjusted on-site to ensure installation accuracy. If a single component (such as a concealed hinge 4) is damaged, it can be disassembled and replaced individually without damaging the door frame 1 or the door leaf 2 structure, greatly reducing maintenance costs and difficulty.

[0034] In one embodiment, both the sub-door 21 and the main door 22 include a steel plate box 23, a fireproof door core 24, and a multi-layer wooden board 25. The steel plate box 23 is hollow inside, the fireproof door core 24 is installed in the steel plate box 23, and there are two multi-layer wooden boards 25, which are respectively installed on both sides of the steel plate box 23.

[0035] The sub-door 21 and the main door 22 use a steel plate frame 23 as their basic framework. The steel plate frame 23 is hollow inside. This design ensures that the door leaf 2 has sufficient strength to withstand external forces such as collisions and compression during daily use, while also reducing the overall weight of the door leaf 2, facilitating opening and closing. Simultaneously, the hollow structure provides space for installing other components. In this embodiment, the steel plate frame 23 is formed by bending double-sided 1.0mm anti-theft steel plates.

[0036] The fireproof door core 24 is installed inside the steel plate box 23, and the steel plate box 23 plays a role in protecting and fixing the fireproof door core 24.

[0037] Two multi-layered wooden boards 25 are respectively installed on both sides of the steel plate body 23. The multi-layered wooden boards 25 are fixed to the steel plate body 23 by a certain connection method (such as gluing, nailing, etc.). The multi-layered wooden boards 25 not only serve a decorative purpose, making the door more beautiful and warm, meeting people's aesthetic needs for home environment; they can also enhance the overall strength and stability of the door leaf 2 to a certain extent.

[0038] In one embodiment, the middle of the edge banding 6 corresponds to the steel plate body 23, and the two sides of the edge banding 6 are used to fix the multi-layer wooden boards 25. The multi-layer wooden boards 25 include a base plate 251 and a shaping frame 252. The base plate 251 is installed on the steel plate body 23, and the shaping frames 252 are multiple and evenly distributed on the base plate 251. In this embodiment, the base plate 251 is a double-sided 5mm multi-layer board with smoked straight-grain red oak veneer (painted). The shaping frame 252 is a double-sided 15mm multi-layer board with smoked straight-grain red oak veneer (painted) to form a U-shaped frame. It is evenly distributed on the base plate 251 with the double-sided 5mm multi-layer board with smoked straight-grain red oak veneer (painted) to form the multi-layer wooden boards 25. The two sides of the base plate 251 and the outermost shaping frame 252 are all located between the edge banding 6 and the steel plate body 23. The edge banding 6 applies an inward pressure to the bottom plate 251 and the outermost shaped frame 252, ensuring that the multi-layer wooden board 25 is tightly fitted to the steel plate body 23, preventing the multi-layer wooden board 25 from loosening or shifting during use.

[0039] In one embodiment, both the child door 21 and the mother door 22 include multiple steel frames 8, which are installed in the steel plate box 23 for fixing and supporting the steel plate box 23 and the fireproof door core 24. The threaded ends of the second screw 47 and the fixing bolt 7 are respectively threadedly connected to the corresponding steel frame 8.

[0040] In this embodiment, the steel frame 8 is a U-shaped steel frame 8. Symmetrically arranged U-shaped steel frames 8 are installed at both ends of the sub-door 21 and the main door 22, and U-shaped steel frames 8 are also installed in the middle of both sub-door 21 and the main door 22. The steel frames 8 have high strength and rigidity, and they are tightly connected to the steel plate housing 23. When the steel plate housing 23 is subjected to external pressure or tension, the steel frames 8 can withstand part of the force and transfer it to the entire door leaf 2 structure. The steel frames 8 not only support the steel plate housing 23, but also play a role in fixing the fireproof door core 24. When installing the fireproof door core 24, the steel frames 8 can provide positioning and support for the fireproof door core 24, ensuring that the fireproof door core 24 is accurately installed inside the steel plate housing 23 and will not shift during use. Furthermore, when the second screw 47 and the fixing bolt 7 are tightened, their threaded ends will engage with the side wall of the U-shaped steel frame 8, which makes the connection between the edge banding 6 and the main body of the door leaf 2 deep and rigid. At the same time, it gives the concealed hinge 4 extremely strong bending stiffness, which can effectively resist deformation caused by its own weight and external forces.

[0041] In one embodiment, a cover plate 48 is provided on the inner side of the fixed leaf plate 41 and the outer side of the movable leaf plate 42. The cover plate 48 and the fixed leaf plate 41 are connected by a first screw 46, and the cover plate 48 and the movable leaf plate 42 are connected by a second screw 47. This can prevent dust and debris from entering the gaps between the hinge housing 43 and the door frame 1, and between the edge banding 6 and the movable leaf plate 42. It can also prevent scratches during installation and improve the sealing of moving parts.

[0042] In one embodiment, a reinforcing plate 9 is also provided in the steel plate housing 23. The reinforcing plate 9 is located inside the outermost steel frame 8, and the threaded end of the second screw 47 is threadedly connected to the reinforcing plate 9. In this embodiment, the reinforcing plate 9 is located inside the U-shaped steel frame 8. The thickness of the reinforcing plate 9 is 5mm. The threaded end of the second screw 47 or fixing bolt 7 passes through the steel plate housing 23 and the steel frame 8 in sequence, and finally screws into the pre-made threaded hole of the reinforcing plate 9 (thickness ≥ 3.0mm), forming a layer material engagement. Even if the threads of the steel plate housing or the steel frame 8 experience slight stripping due to fatigue, the complete thread of the reinforcing plate 9 can still provide additional load-bearing capacity, ensuring connection reliability.

[0043] In one embodiment, the connecting rod 45 is connected to the movable leaf plate 42 via a reinforcing block 49. The reinforcing block 49 is an additionally reinforced, thick metal block. It is securely mounted on the movable leaf plate 42. The connection between the connecting rod 45 and this thick reinforcing block 49 allows the concentrated force transmitted from the connecting rod 45 to be more effectively distributed onto the reinforcing block 49, improving the shear and tear resistance of the connection point.

[0044] The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steel-wood entrance door, comprising a door frame and door panels, wherein the outer side of the door frame is connected to the wall by expansion bolts, and the door panels include a child door and a mother door, both of which are connected to the inner side of the door frame by multiple concealed hinges, characterized in that: The expansion bolts are reinforced on both sides, and the two ends of the reinforced ribs are connected to the door frame and the wall, respectively. The door frame is hollow inside. The concealed hinge includes a fixed leaf plate, a movable leaf plate, a hinge shell, a pivot pin, and a connecting rod. The fixed leaf plate is detachably installed on the inner side of the door frame, and the movable leaf plate is detachably installed on the outer side of the child door or the mother door. The hinge shell is located inside the door frame and is connected to the fixed leaf plate. The pivot pin is located inside the hinge shell and is rotatably connected to the hinge shell. The connecting rod is arc-shaped to fit the hinge shell, and its two ends are connected to the pivot pin and the movable leaf plate, respectively.

2. A steel-wood entrance door with a mother and daughter door according to claim 1, characterized in that: Both ends of the sub-door and the mother door are provided with edge sealing. The edge sealing is a frame structure. The edge sealing located at the outer end of the sub-door or the mother door connects the movable leaf plate and the corresponding sub-door or the mother door.

3. A steel-wood entrance door according to claim 2, characterized in that: The fixed leaf plate is connected to the door frame by a first screw, and the multiple sealing edges are connected to the child door or the mother door by fixing bolts. The two sealing edges located at the outer ends of the child door and the mother door are respectively connected to the corresponding movable leaf plate by a second screw.

4. A steel-wood entrance door as described in claim 3, characterized in that: Both the sub-door and the main door include a steel plate body, a fireproof door core, and multiple layers of wooden boards. The steel plate body is hollow inside, and the fireproof door core is installed inside the steel plate body. There are two multiple layers of wooden boards, which are respectively installed on both sides of the steel plate body.

5. A steel-wood entrance door with a mother and daughter door according to claim 4, characterized in that: The middle part of the edge banding corresponds to the steel plate box body. The two sides of the edge banding are used to fix the multi-layer wooden board. The multi-layer wooden board includes a base plate and a shaping frame. The base plate is installed on the steel plate box body. There are multiple shaping frames, which are evenly distributed on the base plate.

6. A steel-wood entrance door with a mother and daughter door according to claim 4, characterized in that: Both the sub-door and the mother door include multiple steel frames, which are installed in the steel plate box to fix and support the steel plate box and the fireproof door core. The threaded ends of the second screw and the fixing bolt are respectively threadedly connected to the corresponding steel frame.

7. A steel-wood entrance door with a mother and daughter door according to claim 1, characterized in that: Both the inner side of the fixed page plate and the outer side of the movable page plate are provided with cover plates.

8. A steel-wood entrance door with a mother and daughter door according to claim 6, characterized in that: The steel plate box is also equipped with a reinforcing plate, which is located inside the outermost steel frame. The threaded end of the second screw is threadedly connected to the reinforcing plate.

9. A steel-wood entrance door with a mother and daughter door according to claim 1, characterized in that: The connecting rod is connected to the movable leaf plate by a reinforcing block.

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