Invisible connecting piece

Abstract

The utility model relates to the technical field of furniture, in particular to an invisible connecting piece. The device is used for vertically connecting two plates of the panel furniture. The drill bit comprises a section of shaft rod, the front section surface of the shaft rod is provided with forward threads, the rear section surface of the shaft rod is provided with reverse threads like auger bit threads or reverse threads, and the pitch of the reverse threads is larger than that of the forward threads. One end of the surface of the shaft rod is provided with the forward threads, the other end of the surface of the shaft rod is provided with the reverse threads, the shaft rod rotates in a relatively concentrated mode when being hit into a wood plate, the two ends of the shaft rod exert concentrated pulling force on the connecting contact faces of the connecting plates at the two ends, contact connection between the two plates is firmer, and the locking effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of furniture, namely, an invisible connector, which is used for vertically connecting two panels of panel furniture. Background Art

[0002] In the prior art, there are commonly used two-joints that are connected parallel or vertically between two panels of panel furniture. There are implicit and explicit two-joints. Taking the implicit two-joint as an example, the implicit two-joint is a shaft with a pull-back stopper at the front end and a plastic tube with external threads sleeved thereon. When in use, a hole is drilled on the board, the plastic tube is hammered in, the shaft is hammered in, and the stopper at the front end of the shaft passes through the plastic tube and blocks the edge of the plastic tube to prevent it from being pulled out. The disadvantage is that there is a gap between the stopper of the shaft and the front edge of the plastic tube, so that the two connected boards are not tightened and the connection effect is poor. For example, the Chinese utility model patent specification disclosed on May 1, 2018 a utility model patent named "A furniture connector" with application number CN201720176926.5, which includes a connector for connecting two furniture components that need to be connected, including a pair of embedded parts A embedded in one of the furniture components; a pair of embedded parts B embedded in the other furniture component; a pair of connectors for connecting embedded parts A and embedded parts B, wherein the connector connects embedded parts A and embedded parts B through a threaded structure to achieve fixation between the two furniture components, and the threaded structure rotates around the axis of embedded part A or embedded part B, and has a toothed structure A at one end of the connector; a driving member for driving the connecting member to rotate, the disadvantage of which is that there is a gap between the front end of the plastic pipe where the shaft rod stopper is stuck, so that the two connected plates are not tightened, the connection effect is poor, and the structure is complicated.

[0003] On February 2, 2024, the Chinese Utility Model Patent Specification disclosed a utility model patent named "Invisible Two-Connection Parts for Panel Furniture Assembly", with application number CN202321979248.8. It includes a shaft rod with a reverse thread on the surface of the shaft rod like the thread of a twist drill bit. The disadvantage is that the surface of the shaft rod adopts a single reverse thread, and the two-way locking effect is not particularly ideal during the process of hammering in another board. Utility Model Content

[0004] The purpose of the utility model is to provide an invisible connector with a simple structure and a more secure connection in view of the above-mentioned shortcomings.

[0005] The technical solution of the utility model is: an invisible connector, which is characterized by comprising a shaft, a front surface of the shaft having a forward thread, a rear surface of the shaft having a reverse thread like a twist drill thread, or a rear surface of the shaft having a reverse thread, and the pitch of the reverse thread is greater than the pitch of the forward thread.

[0006] The above scheme also includes:

[0007] The pitch of the reverse thread is more than eight times greater than the pitch of the forward thread.

[0008] The shaft has a diameter of 6-8 mm, a forward thread length of 12-15 mm, and a reverse thread length of 18-25 mm.

[0009] The advantages of the utility model are: one end of the shaft surface is a forward thread, and the other end is a reverse thread. The shaft is screwed in first, and the shaft will continue to move forward when it is hit into the wooden board. The shaft forms a tight pulling force between the two boards. Both ends of the shaft exert concentrated pulling force on the connecting plates at both ends toward the connecting contact surface. The contact connection between the two boards is more firm, and the locking effect is improved.

[0010] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a simplified structural diagram of the utility model.

[0012] Figure 2 It is a simplified structural diagram of the utility model in use state.

[0013] Figure 3 This is a schematic diagram of the structure after the shaft rod is screwed into the vertical plate.

[0014] Figure 4 yes Figure 3 Simple diagram of the structure after the horizontal board is smashed into the middle. DETAILED DESCRIPTION

[0015] See also Figure 1 -4, the names of the parts are as follows: shaft 1, reverse thread 2, forward thread 3, vertical plate 4, horizontal plate 5, vertical plate blind hole 6, horizontal plate blind hole 7.

[0016] See also Figure 1 , invisible connector, including a shaft 1, a positive thread 3 is provided on the front surface of the shaft 1, a reverse thread 2 like a twist drill bit thread is provided on the rear surface of the shaft 1, or a reverse thread 2 is provided on the rear surface of the shaft 1, the pitch is relatively large, and the diameter of the shaft 1 where the positive thread 3 and the reverse thread 2 are located is the same. The pitch of the reverse thread 2 is greater than the pitch of the positive thread 3. The pitch of the reverse thread 2 is greater than the pitch of the positive thread 3 by more than eight times, such as eight times, or ten times, and is usually determined according to the length of the shaft 1. For example, the diameter of the shaft 1 is 6-8 mm, the length of the positive thread 3 is 12-15 mm, and the length of the reverse thread 2 is 18-25. Specifically, the diameter of the shaft 1 is 6 mm, the length is 36 mm, the length of the positive thread 3 is 14 mm, and the length of the reverse thread 2 is 22 mm, but it is not limited thereto. The end of the rear end of the shaft 1 has a transverse notch or a cross notch for screwing in a screwdriver (figure omitted).

[0017] See also Figure 1 ,2 , How to use: Invisible connectors are used to vertically connect two panels. Figure 2 The middle vertical board 4 and the horizontal board 5 are connected by two spaced shafts 1. Drill the vertical board blind hole 6 (with a diameter smaller than the outer diameter of the shaft 1) on the plane of the vertical board 4, and drill the horizontal board blind hole 7 (with a diameter smaller than the outer diameter of the shaft 1) on the end face of the horizontal board 5. First, screw the positive thread 3 end of the shaft 1 into the vertical board blind hole 6, leaving space at the front end, and then align the horizontal board blind hole 7 on the end face of the horizontal board 5 with the shaft 1, and hammer into the horizontal board 5. At this time, during the hammering process, the shaft 1 rotates and moves forward in the hole, and the horizontal board 5 is connected with the vertical board 4 after hammering. Since one end of the surface of the shaft 1 is a positive thread 3 and the other end is a reverse thread 2, the shaft 1 has a pulling force on the horizontal board 5 toward the vertical board 4. After the connection, the two ends of the shaft 1 have a concentrated pulling force on the connecting contact surface of the two end connecting plates. It is not only a connection, but also a pulling force between the horizontal board 5 and the vertical board 4, so as to achieve a tighter connection. The shaft 1 cannot be seen after the connection, so it is an invisible connector. The two wooden boards move towards each other during the installation process. If the cabinet is designed incorrectly and needs to be disassembled and reassembled, the invisible parts can be taken out and reused, and special tools for removing the parts are available.

[0018] See also Figure 3 , 4 , only for experiment. The vertical plate connecting hole 10 is designed as a through hole. After being hit into the horizontal plate 5, it is measured that the first hole depth 8 is obviously greater than the second hole depth 9, indicating that the shaft rod 1 rotates and moves forward after being hit into the horizontal plate 5.

[0019] The above description is only a specific implementation of the present utility model, and various examples do not constitute a limitation on the essential content of the present utility model.

Claims

1. Invisible connector, characterized by The invention comprises a shaft (1), wherein the front surface of the shaft (1) has a forward thread (3), and the rear surface of the shaft (1) has a reverse thread (2) similar to the thread of a twist drill, or the rear surface of the shaft (1) has a reverse thread (2), and the pitch of the reverse thread (2) is greater than the pitch of the forward thread (3).

2. The invisible connector according to claim 1, characterized in that The pitch of the reverse thread (2) is more than eight times greater than the pitch of the forward thread (3).

3. The invisible connector according to claim 1 or 2, characterized in that The shaft (1) has a diameter of 6-8 mm, a forward thread (3) length of 12-15 mm, and a reverse thread (2) length of 18-25.

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