Special screw for hard timber
By designing special screws for hard wood, using flat head non-self-tapping structure and hollow stud sections, combined with deformation grooves and steel balls, the problem of inconvenience in use of existing wood screws on hard wood is solved, and the close connection with the wood is achieved.
Patent Information
- Application Number
- CN202421736203.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-22
AI Technical Summary
When dealing with hard wood, existing wood screws have limited self-explosion functions and require pre-punching, which is inconvenient to use.
A special screw for hard wood is designed, using a flat-head non-self-tapping structure and hollow stud part, combined with deformation grooves and steel balls, and the steel balls are extruded to achieve a close connection with the wood.
This screw is suitable for pre-punched hard wood. It forms a tight connection through the steel ball extrusion when the screw is tightened, solving the problem of inconvenience in using traditional wood screws on hard wood.
Smart Images
Figure CN222910486U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fasteners, and more specifically, to a special screw for hard wood. Background Art
[0002] Traditional wood screws are mostly equipped with self-tapping function, and one end of the screw has a pointed head, which can be self-tapping. This type of conventional wood screw is mostly used for installing wood with slightly lower hardness. If it is used for some hard wood, the self-tapping function is limited and holes need to be punched in advance. Therefore, the utility model proposes a special screw for hard wood. Utility Model Content
[0003] The utility model aims to overcome the above-mentioned deficiencies in the prior art and to provide a special screw for hard wood. The screw is suitable for connecting hard wood and has strong speciality.
[0004] In order to solve the above technical problems, the purpose of the utility model is achieved as follows: the utility model involves a special screw for hard wood, including a stud portion with screw threads on the outer wall, one end of the stud portion has a rotating portion, and the other end has a flat head, the stud portion is provided with a center hole arranged coaxially, the outer periphery of the center hole is provided with a plurality of deformation grooves extending along the radial direction of the stud portion and laterally penetrating the stud portion, the deformation grooves extend in the depth direction along the axial direction of the stud portion, and the notch of the deformation groove is arranged on the flat head.
[0005] The utility model is further configured as follows: it also includes a steel ball, the diameter of the steel ball is larger than the diameter of the central hole; the diameter of the steel ball is smaller than the diameter of the stud part.
[0006] The utility model is further configured as follows: a cross reinforcement rib extending along the axial direction is provided in the central hole, the cross reinforcement rib is arranged above the deformation groove, the cross reinforcement rib is connected to the stud part, and the cross reinforcement rib is also connected to the rotating part.
[0007] The utility model is further configured as follows: a stress relief hole communicating with the deformation groove is provided at the bottom of the deformation groove, and the stress relief hole also extends along the radial direction of the central hole.
[0008] The utility model is further configured such that: the interval angles between two adjacent deformation grooves are equal.
[0009] In summary, the utility model has the following beneficial effects:
[0010] 1. It adopts a flat head non-self-drilling structure and is suitable for installation on pre-punched hard wood.
[0011] 2. The hollow stud structure is matched with deformation grooves and a steel ball. When the screw is tightened, the steel ball is squeezed and expanded outward, so that the screw and the wood form a tight connection. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0013] Figure 2 It is a structural schematic diagram of another embodiment of the utility model;
[0014] Figure 3 It is a schematic diagram of the use state of the utility model. DETAILED DESCRIPTION
[0015] In order to enable those skilled in the art to better understand the technical solution of the utility model, the preferred implementation scheme of the utility model is described below in conjunction with specific embodiments, but it should be understood that these descriptions are only for further illustrating the features and advantages of the utility model, rather than limiting the patent requirements of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.
[0016] The utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.
[0017] Example 1
[0018] See also Figure 1 and Figure 3 As shown, the present embodiment involves a special screw for hard wood, comprising a stud portion 2 with threaded teeth 1 on the outer wall surface, a rotating portion 3 at one end of the stud portion 2 and a flat head 4 at the other end, a center hole 5 coaxially arranged is provided on the stud portion 2, a plurality of deformation grooves 6 extending along the radial direction of the stud portion and laterally penetrating the stud portion are arranged on the periphery of the center hole 5, the deformation grooves 6 extend in the depth direction along the axial direction of the stud portion 2, and the notch of the deformation groove 6 is arranged on the flat head 4.
[0019] Furthermore, it also includes a steel ball 7 , the diameter of which is larger than the diameter of the central hole 5 ; the diameter of the steel ball 7 is smaller than the diameter of the stud part 2 .
[0020] Furthermore, a stress relief hole 9 communicating with the deformation groove 6 is formed at the bottom of the deformation groove 6 , and the stress relief hole 9 also extends in the radial direction of the center hole 5 .
[0021] Furthermore, the interval angles between two adjacent deformation grooves 6 are equal.
[0022] In this embodiment, a hole (countersink) is firstly punched on the hard wood to which the screw is to be connected, and the hole diameter is slightly smaller than the outer diameter of the stud portion 2 to ensure that the thread 1 can still be self-drilled when the stud portion 2 is screwed in. A steel ball 7 is then placed at the bottom of the hole, and then the screw is screwed in. After the stud portion 2 on the screw contacts the steel ball 7, its contact end will expand outward due to the extrusion force until a tight connection is formed between the contact end and the wood.
[0023] The stress relief holes 9 are provided to prevent the bottom of the deformation groove 6 from cracking due to stress concentration.
[0024] Example 2
[0025] See also Figure 1 and Figure 3 As shown, the present embodiment involves a special screw for hard wood, which is further configured on the basis of Embodiment 1, wherein a cross reinforcement rib 8 extending along the axial direction is provided in the center hole 5, the cross reinforcement rib 8 is provided above the deformation groove 6, the cross reinforcement rib 8 is connected to the stud part 2, and the cross reinforcement rib 8 is also connected to the rotating part 3.
[0026] In this embodiment, the cross reinforcement rib 8 is provided to enhance the structural strength of the stud portion 2 above the deformation slot 6 and prevent deformation.
[0027] The utility model relates to a special screw for hard wood, which adopts a flat head non-self-tapping structure and is suitable for installation in pre-punched hard wood. It also adopts a hollow stud structure, with deformation grooves and a steel ball distributed around it. When the screw is tightened, the steel ball is squeezed and expanded outwards to form a tight connection between the screw and the wood. The overall function is perfect and the practicability is strong.
[0028] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationship are based on the orientation or positional relationship actually shown, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in combination with the embodiments and according to specific circumstances.
[0029] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0030] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.
Claims
1. A special screw for hard wood, comprising a stud portion with screw threads on the outer wall, a rotating portion at one end of the stud portion and a flat head at the other end, characterized in that: The stud part is provided with a center hole arranged coaxially, and a plurality of deformation grooves extending along the radial direction of the stud part and laterally penetrating the stud part are arranged on the periphery of the center hole. The deformation grooves extend in depth direction along the axial direction of the stud part, and the notches of the deformation grooves are arranged on the flat head.
2. The special screw for hard wood according to claim 1, characterized in that: It also includes a steel ball, the diameter of which is larger than the diameter of the central hole; the diameter of the steel ball is smaller than the diameter of the stud part.
3. The special screw for hard wood according to claim 1 or 2, characterized in that: A cross reinforcing rib extending in the axial direction is arranged in the central hole, the cross reinforcing rib is arranged above the deformation groove, the cross reinforcing rib is connected to the stud part, and the cross reinforcing rib is also connected to the rotating part.
4. The special screw for hard wood according to claim 3, characterized in that: A stress relief hole communicating with the deformation groove is provided at the bottom of the deformation groove, and the stress relief hole also extends along the radial direction of the central hole.
5. The special screw for hard wood according to claim 1, characterized in that: The interval angles between two adjacent deformation grooves are equal.