Panel furniture assembly invisible two-link

Abstract

This utility model relates to the field of furniture technology, specifically a concealed two-piece assembly for panel furniture. It is used for parallel or perpendicular connection between two panels in panel furniture. It includes a shaft with a reverse thread resembling a twist drill bit on its surface. A through-hole is located in the middle of the shaft. A screw is inserted into the through-hole. The outer end face of the shaft is tapered. By using a shaft with a screw in the middle, when connecting two panels, the front panel does not require pre-drilling; the shaft is directly screwed upright by the screw passing through it. When connecting the rear panel, a blind hole is pre-drilled in the rear panel for the shaft to insert. During connection, the blind hole is aligned with the shaft, and the shaft is inserted. Because of the reverse thread resembling a twist drill bit on the outer surface of the shaft, the shaft rotates slightly around the screw, simultaneously forming a threaded connection within the blind hole, resulting in a tight connection. During the connection of the two panels, the shaft simultaneously forms a threaded connection with the blind hole around the screw, ensuring a secure and effective connection.

Description

Technical Field

[0001] This utility model relates to the field of furniture technology, specifically to a concealed two-piece assembly for panel furniture. It is used for parallel or perpendicular connection between two panels in panel furniture. Background Technology

[0002] In existing technology, parallel or perpendicular connections between two panels in panel furniture are commonly achieved using two-piece connectors. These connectors can be concealed or exposed. A Chinese utility model patent specification published on February 20, 2024, entitled "Concealed Two-Piece Connector for Panel Furniture Assembly," patent number 202321979248.8, filed on July 26, 2023, includes a shaft with reverse threads on its surface, resembling the threads of a twist drill bit. The shaft has reverse threads on its surface, similar to those of a twist drill bit. When the shaft is driven into the wooden board, it rotates in, achieving a counter-locking or bi-directional locking connection between the two boards. However, its drawback is that when connecting two boards, a hole is drilled in the first board, the shaft is driven in, and then the hole in the second board is aligned with the shaft before driving it in. Because the shaft is firmly connected to the first board, it cannot rotate around the first board when the second board is driven in, thus failing to achieve a rotatable connection with the second board. The twist drill thread on the shaft surface does not effectively perform its connecting function, reducing the connection efficiency. Utility Model Content

[0003] The purpose of this utility model is to provide an improved structure and a better connection effect for assembling invisible two-piece panels for panel furniture in order to address the above-mentioned shortcomings.

[0004] The technical solution of this utility model is: a concealed two-piece assembly for panel furniture, including a shaft with reverse threads resembling those of a twist drill bit on its surface. A through-hole is located in the middle of the shaft. A screw is inserted into the through-hole.

[0005] The central hole is a conical hole.

[0006] The outer end face of the shaft is a conical surface.

[0007] The advantages of this utility model are: 1. It adopts a shaft with a screw in the middle. When connecting two boards, the front board does not need to be pre-drilled. The shaft is directly screwed upright by passing the screw through it. When connecting the rear board, a blind hole for the shaft to insert is pre-drilled on the rear board. During connection, the blind hole is aligned with the shaft and inserted. At this time, because the outer surface of the shaft has a reverse thread with a twist drill bit thread, the shaft rotates slightly around the screw and forms a threaded connection in the blind hole, resulting in a tight connection. 2. During the connection of the two boards, the shaft forms a threaded connection with the blind hole while rotating around the screw, resulting in a tight connection. 3. The center hole is preferably a tapered hole, that is, the diameter of the hole is larger near the tip of the screw, and the shaft and screw have a swing displacement to accommodate the position deviation of the blind hole 7 where the wooden parts are connected. 4. The structure is reasonable and the connection effect is good.

[0008] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a simplified diagram of the shaft structure of this utility model.

[0010] Figure 2 This is a simplified structural diagram of the utility model in use.

[0011] Figure 3 This is a simplified diagram of the enlarged structure of the central hole.

[0012] The parts in the diagram are named as follows: shaft 1, reverse thread 2, center hole 3, screw 4, vertical plate 5, flat plate 6, blind hole 7, conical surface 8. Detailed Implementation

[0013] See Figure 1 , 2 3. A concealed two-piece assembly for panel furniture includes a shaft 1. The surface of shaft 1 has reverse threads 2, similar to those of a twist drill bit. A central hole 3 is located in the middle of shaft 1. The central hole 3 is used to insert a screw 4 that can pass through shaft 1; that is, the length of screw 4 is greater than that of shaft 1. The connection between screw 4 and the central hole 3 of shaft 1 should be appropriately tight. The central hole 3 is preferably a tapered hole (see...). Figure 3 The diameter of the hole near the tip of screw 4 is larger, and there is a swing displacement between the shaft 1 and screw 4 to accommodate the positional deviation of the blind hole 7 where the wooden parts are connected. The outer end face of the shaft 1 is conical to facilitate insertion into the hole on the other board it is connected to. The center hole 3 is a smooth hole, preferably large enough to accommodate screw 4. The shaft 1 is made of plastic, but other metal materials are also acceptable. The shaft 1 and screw 4 are used as a set.

[0014] Shaft 1 has a length of 40-50mm and a diameter of 6-8mm. For example, shaft 1 with a length of 40mm, a diameter of 6mm, and a thread pitch of 10mm; shaft 1 with a length of 50mm, a diameter of 8mm, and a thread pitch of 13mm, and so on. The surface of shaft 1 has a reverse thread 2 (thread groove) similar to a twist drill thread, meaning the thread tip is nearly flat, the thread pitch is relatively large, and the thread direction is opposite to that of a twist drill bit. In short, shaft 1 is like a "twist drill bit." In practice, it has been found that the reverse thread on the surface of shaft 1 allows it to be screwed into the wooden board by rotation, resulting in an extremely secure connection. If used to achieve a two-way locking between two wooden boards, it can be unscrewed in the reverse direction without damaging the wooden hole, and will not loosen when screwed in again. "Reverse" means that, for example, the bottom thread of a twist drill bit rises from left to right, while the reverse means that the bottom thread of shaft 1 rises from right to left. A twist drill thread is used because a wider thread pitch is required, meaning there is a certain width between the threads, rather than a regular connecting thread.

[0015] Instructions for use: Taking the connection of a single two-piece joint between the upright plate 5 and the flat plate 6 as an example: The shaft 1 is fitted onto the screw 4, and the tip of the screw 4 is screwed onto the upright plate 5, fixing the shaft 1. The screw 4 and shaft 1 should be tightened appropriately. The upright plate 5 does not need to be pre-drilled; simply screw the shaft 1 through the screw 4 to erect it. Align the blind hole 7 on the flat plate 6 with the shaft 1 and hammer it in, thus connecting the upright plate 5 and the flat plate 6. If the arrangement of the blind holes 7 is off, when the blind holes 7 act on the shaft 1, the shaft 1 will undergo a slight adjustment relative to the screw 4 along the center line (caused by the presence of the conical center hole 3) to meet on-site requirements. On-site connection of the upright plate 5 and flat plate 6 uses multiple, spaced two-piece joints connected simultaneously. The outer end face of the shaft 1 is a conical surface 8, facilitating the insertion of the blind hole 7. The outer surface of the shaft 1 has a reverse thread 2 with a twist drill bit thread. The shaft 1 rotates slightly around the screw 4 while simultaneously forming a threaded connection within the blind hole, ensuring a secure connection.

[0016] The above description is merely a specific embodiment of this utility model, and the various examples do not constitute a limitation on the substantive content of this utility model.

Claims

1. A concealed two-piece assembly for panel furniture, comprising a shaft (1) having a reverse thread (2) on its surface resembling a twist drill thread, characterized in that... The shaft (1) has a through-hole (3) in the middle; a screw (4) is inserted into the through-hole (3).

2. The concealed two-piece assembly for panel furniture according to claim 1, characterized in that... The central hole (3) is a conical hole.

3. The concealed two-piece assembly for panel furniture according to claim 1 or 2, characterized in that... The outer end face of the shaft (1) is a conical surface (8).

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