Indoor door structure without door pocket line
The frameless interior door structure solves the problems of complex installation and poor aesthetics of traditional interior doors by precisely matching the slots and protrusions and fixing them with hinge screws, achieving rapid installation, stable connection and high aesthetic effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI CHENGZHONGTANG HOME DESIGN CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-05-15
AI Technical Summary
Traditional interior door structures suffer from problems such as complex installation, high cost, insufficient aesthetics, space occupation, and easy material deformation, which are especially noticeable when used in confined spaces.
The design features a frameless construction, with the slots and protrusions of frame one, frame two, and frame three precisely matched and secured with hinges and screws, enabling quick assembly and stable connection. Adhesive is applied to the back of frame two to increase fit, and positioning strips and sealing strips are used for sealing and cushioning.
It simplifies the installation process, reduces costs, improves construction efficiency and overall stability, enhances connection strength, reduces visual clutter, and improves living comfort and aesthetics.
Smart Images

Figure CN224244697U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of interior door technology, specifically to an interior door structure without door casing. Background Technology
[0002] In the field of architectural decoration, interior doors are important components connecting different spaces. Their structural design and installation methods have a significant impact on the overall decorative effect, functionality and construction efficiency. Traditional interior doors usually adopt a door casing structure, which covers the gap between the wall and the door frame to achieve both decorative and protective functions.
[0003] However, with the continuous improvement of the decoration industry and the increasing aesthetic demands of consumers, traditional interior doors urgently need to be upgraded and improved in terms of quality and appearance. Traditional door frames require door casing lines to cover the door frame and the nails, screws and other fasteners that fix the door frame to the wall. This results in complex installation, high cost and insufficient aesthetics. The installation of door casing lines also requires additional space, which further reduces the usable area in small spaces. Door casing lines made of wood or artificial boards are prone to deformation and cracking due to moisture and impact, leading to increased maintenance costs. Therefore, it is necessary to design an interior door structure without door casing lines to solve the above problems. Utility Model Content
[0004] The purpose of this utility model is to provide an interior door structure without door casing to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an interior door structure without a door frame, comprising a door opening wall, a mounting base, a sealing strip, a first door frame, a second door frame, a third door frame, a door leaf, hinges, and screws. The mounting base is provided on the inner side of the door opening wall. The door frames are divided into a first door frame, a second door frame, and a third door frame. A hinge is provided on one side of the first door frame, and a step and a slot protrusion are provided on the other side. The step is used to lock the screws in to fix the first door frame to the mounting base. The slot protrusion is used to connect with the second door frame. The second door frame has hinges on both sides and the back. The door frame has a slot. The door leaf is provided on one side of the door frame 2, which is connected to the door frame 1. A positioning strip is used to position the closed position of the door leaf. The groove on the back of the door frame 2 is used to apply glue during installation to increase the adhesion strength between the door frame 2 and the mounting base. The other side of the door frame 2 has a slot with a step. The step is used to lock in screws to fix the door frame 2 to the mounting base. The slot is used to connect the door frame 3 to the door frame panel. The door frame 3 has a slot protrusion on one side. After the door frame 1 and door frame 2 are installed, the slot protrusion of the door frame 3 is pushed into the slot of the door frame 2 to complete the installation of the door frame.
[0006] The door frame is installed on the mounting base, and the other side of the door frame has a hinge for connecting and installing the door leaf, through which the door leaf is installed on the door frame.
[0007] Preferably, the hinge is used for connection and installation with the door leaf, which facilitates the stability between the door leaf and the door frame through the hinge.
[0008] Preferably, the positioning strip has an installation groove for the sealing strip, and the sealing strip is fixedly connected in the installation groove, so that the positioning strip can play a buffering and sealing role when the door is closed.
[0009] Preferably, the step provided on the slot on the other side of the second door frame is used to lock in screws to fix the second door frame to the mounting base, so as to ensure the stability of the second door frame and the mounting base through screws.
[0010] Compared with the prior art, this utility model provides an interior door structure without door frame trim, which has the following advantages:
[0011] 1. This interior door structure without door frames allows for rapid assembly of door frames one, two, and three through precise matching of slots and protrusions, eliminating the need for complex assembly processes and significantly reducing installation time. Simultaneously, the combination of hinges and screws simplifies installation, making it easy for ordinary installers to operate, effectively improving construction efficiency and reducing labor costs. The slot connections between the various door frame components, combined with screw fixation, form a tight and stable overall structure, enhancing the connection strength between the door frame and the wall opening. This allows it to withstand frequent opening and closing and external impacts during daily use, reducing the likelihood of loosening or deformation and extending the lifespan of the interior door. Furthermore, the adhesive design on the back of door frame two further increases its adhesion to the mounting base, improving overall stability. The door leaf positioning strip on door frame two not only accurately defines the closed position of the door leaf but also features a sealing strip installation groove. By embedding the sealing strip, it effectively fills the gap between the door leaf and the door frame, blocking airflow, noise transmission, and dust intrusion, creating a quiet and clean indoor environment and improving living comfort.
[0012] 2. This interior door structure without door casing breaks away from the traditional interior door structure, making the transition between the door and the wall simpler and smoother, reducing visual clutter, and matching the modern minimalist decoration style. It can better integrate with different decoration styles, enhance the overall aesthetics of the interior, and at the same time, reducing the use of door casing also reduces material costs, combining practicality and economy. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0015] Figure 2 This is a schematic diagram of the sectional structure of the door leaf;
[0016] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;
[0017] Figure 4 This is a schematic diagram of the left side structure for installing the base layer.
[0018] In the diagram: 1. Doorway wall; 2. Installation base layer; 3. Sealing strip; 4. Door frame one; 5. Door frame two; 6. Door frame three; 7. Door leaf; 8. Hinges; 9. Screws. Detailed Implementation
[0019] 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, 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.
[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0021] This utility model provides the following technical solution:
[0022] Example 1
[0023] Please see Figure 1-4This utility model provides a technical solution: an interior door structure without a door frame, including a door opening wall 1, a mounting base 2, a sealing strip 3, a first door frame 4, a second door frame 5, a third door frame 6, a door leaf 7, hinges 8, and screws 9. The mounting base 2 is provided on the inner side of the door opening wall 1. The door frames are divided into first door frame 4, second door frame 5, and third door frame 6. A hinge 8 is provided on one side of first door frame 4, and a step and a slot protrusion are provided on the other side. The step is used to lock the screws 9 in to fix first door frame 4 to the mounting base 2. The slot protrusion is used to connect with second door frame 5. Second door frame 5 has openings on both sides and the back. The door frame 25 has a slot. On one side of the door frame 14, there is a door leaf 7 and a positioning strip for positioning the closed position of the door leaf 7. The groove on the back of the door frame 25 is used to apply glue during installation to increase the adhesion strength between the door frame 25 and the mounting base 2. There is a slot on the other side of the door frame 25, and the slot has a step. The step is used to lock the screw 9 to fix the door frame 25 to the mounting base 2. The slot is used to connect the door frame 36 of the door frame panel. The door frame 36 has a slot protrusion on one side. After the door frame 14 and the door frame 25 are installed, the slot protrusion of the door frame 36 is pushed into the slot of the door frame 25 to complete the installation of the door frame.
[0024] Door frame 4 is installed on the base plate 2. On the other side of door frame 4, there is a hinge 8 for connecting door leaf 7. The door leaf 7 is installed on the door frame plate through the hinge 8.
[0025] Hinges 8 are used for connection and installation with door leaf 7, which facilitates the stability between door leaf 7 and door frame 4.
[0026] The positioning strip has an installation groove for the sealing strip 3. The sealing strip 3 is fixedly connected in the installation groove, so that the positioning strip can play a buffering and sealing role when the door leaf 7 is closed.
[0027] The step on the slot on the other side of the door frame 2 5 is used to lock the screw 9 to fix the door frame 2 5 to the mounting base 2, so as to ensure the strength and stability of the door frame 2 5 and the mounting base 2 through the screw 9.
[0028] In actual operation, when this device is used, firstly, install door frame 1 4 on the base layer of the door opening wall 1. Door frame 1 4 has a door leaf 7 hinge 8 on one side. The door leaf 7 is installed on door frame 1 4 through the hinge 8. The other side of door frame 1 4 is provided with a step and a slot protrusion. When installing, apply a small amount of environmentally friendly building installation connection adhesive to the back of door frame 1 4 and adjust its horizontal and front-back position to place it on the installation base layer 2. Lock screw 9 into the step of door frame 1 4 to fix door frame 1 4 on the installation base layer 2. Then, fill the groove on the back of door frame 2 5 with environmentally friendly installation adhesive. Then push the slot protrusion of door frame 2 5 into the slot of door frame 1 4 to make door frame 2 5 and door frame 1 4 tightly connected and installed on the base layer 2 of the door opening. This also covers and conceals the installation screw 9 of door frame 1 4. After tightening, lock screw 9 into the step on the other side of door frame 2 5 to fix door frame 2 5 on the installation base layer 2.
[0029] Then, apply a small amount of environmentally friendly building installation adhesive to the back of door frame 36 and push its protruding slot into the slot of door frame 25 to make door frame 36 and door frame 25 tightly connected and to cover the installation screws 9 of door frame 25. After installing door frame 36, use tools to fix door frame 36. After the adhesive on the back of door frame 36 has dried, the installation of the entire door frame is completed. After the entire door frame is installed, mill a groove on the outside of door frame 14 and install the door leaf connecting hinge 8. Then adjust the position of door leaf 7 and mark the position of hinge 8. Mill the installation groove of connecting hinge 8 and then connect and install door leaf 7 and door frame. Then embed sealing strip 3 into the positioning strip groove of door frame 25. Then install the other hardware of the door. At this point, the installation of the entire interior door without door frame line is completed.
[0030] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these should also be considered within the scope of protection of this utility model. These will not affect the implementation effect of this utility model or the practicality of the patent.
[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
Claims
1. An interior door structure without door frame trim, comprising a door opening wall (1), a mounting base (2), a sealing strip (3), a first door frame (4), a second door frame (5), a third door frame (6), a door leaf (7), hinges (8), and screws (9), characterized in that: The inner side of the doorway wall (1) is provided with an installation base (2). The door frame is divided into door frame one (4), door frame two (5) and door frame three (6). Door frame one (4) is provided with a hinge (8) on one side and a step and slot protrusion on the other side. The step is used to lock in screws (9) to fix door frame one (4) to the installation base (2). The slot protrusion is used to connect with door frame two (5). Door frame two (5) has slots on both sides and back. Door frame two (5) is provided with a door leaf (7) on the side that connects to door frame one (4) and has a positioning strip for positioning the door. In the closed position of the fan (7), the groove on the back of the second door frame (5) is used to apply glue during installation to increase the bonding strength between the second door frame (5) and the mounting base (2). The second door frame (5) has a slot on the other side, and the slot is provided with a step. The step is used to lock in the screw (9) to fix the first door frame (4) to the mounting base (2). The slot is used to connect the third door frame (6) of the door frame panel. The third door frame (6) has a slot protrusion on one side. After the first door frame (4) and the second door frame (5) are installed, the slot protrusion of the third door frame (6) is pushed into the slot of the second door frame (5) to complete the installation of the door frame. The door frame (4) is installed on the mounting base (2). On the other side of the door frame (4), there is a hinge (8) for connecting the door leaf (7). The door leaf (7) is installed on the door frame through the hinge (8).
2. The interior door structure without door casing according to claim 1, characterized in that: The hinge (8) is used for connection and installation with the door leaf (7).
3. The interior door structure without door frame as described in claim 1, characterized in that: The positioning strip has an installation groove for the sealing strip (3), and the sealing strip (3) is fixedly connected in the installation groove.
4. The interior door structure without door casing according to claim 1, characterized in that: The step provided on the slot on the other side of the door frame two (5) is used to lock in the screw (9) to fix the door frame two (5) to the mounting base (2).