Special-shaped fastening kit
By designing screwdrivers and screws for irregularly shaped fastening kits, and employing a rotary parabolic surface and a trilobal tapered structure, the problem of sharp edges on irregularly shaped screws and screwdrivers is solved, achieving high safety, long lifespan, and aesthetic appeal.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2026-03-06
AI Technical Summary
Existing irregularly shaped screws and screwdrivers have sharp edges, which pose safety hazards, are unsightly, and have a short service life.
Design an irregular fastening kit where the screwdriver tip has a rotary parabolic structure and the screw groove has a trilobal tapering shape. When the two are fitted together, there are no obvious sharp corners, and the screw groove and the screw tip fit together completely, increasing the contact area and uniform stress distribution.
It improves safety, reduces wear, extends service life, has an attractive appearance, and is easy to process.
Smart Images
Figure CN223975385U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of fastener technology, specifically a non-circular fastening kit. Background Technology
[0002] Screws and other fasteners are widely used in all aspects of life and production. In certain situations or with equipment, such as electronic products, home appliances, and automotive parts, special-shaped screws are often used to secure the equipment and prevent easy disassembly with ordinary tools (such as flathead or Phillips screwdrivers) to improve safety or protect intellectual property. Special-shaped screws require corresponding special-shaped screwdrivers for assembly and disassembly. However, some existing special-shaped screws have sharp edges, resulting in screwdrivers with sharp edges as well, such as triangular screws and Torx screws. This poses certain safety hazards and is unsightly. Furthermore, the sharp edges are prone to wear during storage and use, reducing their lifespan. Utility Model Content
[0003] To address the aforementioned problems in the existing technology, the purpose of this utility model is to provide an irregularly shaped fastening kit, consisting of an irregularly shaped screw and a screwdriver used in conjunction with it, for fastening equipment and preventing ordinary tools from easily disassembling the equipment; the screwdriver has a smooth tip with no obvious sharp corners, and the screw it mates with has a smooth surface, ensuring good safety during use and preventing accidental scratches to workers; it is not easily worn during storage and use, resulting in a long service life; it is aesthetically pleasing, with a symmetrical and simple structure, and is easy to process.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] An irregular fastening kit includes a screwdriver and a screw, which are used together. The screw includes a head and a shank. The top of the head has a screw groove in the shape of a trefoil. The screw groove tapers from the head toward the shank. The tip of the screwdriver is the part that can be inserted into the screw groove and contact the screw during use. The tip is formed by removing material on a structure with a parabolic outer surface.
[0006] As a further improvement to the above technical solution:
[0007] The cutter head has three cutter head grooves, which are grooves formed by removing material on the outer surface of the material-parabolic structure. The three cutter head grooves are symmetrically arranged around the central axis of the cutter head.
[0008] When the cutting head is inserted into the screw slot, all the walls of the screw slot are in contact with the cutting head, at which point the cutting head is fully or partially inserted into the screw slot.
[0009] The bottom surface of the screw slot is flat, and the end face of the cutting head is flat. When the cutting head is inserted into the screw slot, the end face of the cutting head contacts the bottom surface of the screw slot.
[0010] A screwdriver consists of a handle and a shaft, both of which are rod-shaped and connected to form an L-shape. The end of the shaft furthest from the handle is the cutting tip, and the central axis of the cutting tip is aligned with the length of the shaft.
[0011] The tool holder includes a tool head and a rod body. The two ends of the rod body are connected to the handle and the tool head, respectively. The tool head groove extends from the central axis of the tool head to the middle of the rod body near the end of the tool head.
[0012] Within a cross-section perpendicular to the central axis of the cutter head, the cutter head groove is a fan-shaped groove with rounded corners at the apex.
[0013] The top of the head is a convex curved surface.
[0014] The beneficial effects of this utility model are:
[0015] (1) A kit consisting of a special-shaped screw and a screwdriver used with it, used to fasten equipment and prevent ordinary tools (such as flathead or Phillips screwdrivers) from easily disassembling the equipment;
[0016] (2) Compared with existing flathead or Phillips screwdrivers and some commonly used irregular screwdrivers (such as triangular or pentagonal screwdrivers), the screwdriver of this application has a smooth tip with a parabolic profile and no obvious sharp corners. The screws that it is used with have a smooth surface, which makes it safe to use and will not accidentally scratch the workers.
[0017] (3) The screw slot is trilobal in shape, which has a large contact area with the screwdriver and improves the torque transmission efficiency.
[0018] (4) The tapered design of the screw groove reduces stress concentration, makes the stress distribution more uniform, and reduces the risk of failure and stripping during use.
[0019] (5) The larger contact area and uniform stress distribution mentioned above make the friction of screws and screwdrivers more uniform during use and reduce the wear rate, that is, they are not easy to wear during storage and use and have a long service life.
[0020] (6) It has a beautiful appearance, symmetrical and simple structure, and is easy to process. Attached Figure Description
[0021] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.
[0022] Figure 2 This is a schematic diagram of a screwdriver structure according to an embodiment of the present invention.
[0023] Figure 3 yes Figure 2 Enlarged diagram of point A.
[0024] Figure 4This is a schematic diagram of a screw structure according to an embodiment of the present invention.
[0025] Figure 5 This is a schematic diagram of the screw structure from another perspective according to one embodiment of the present invention. Detailed Implementation
[0026] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.
[0027] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0028] An irregularly shaped fastening kit, such as Figure 1 As shown, it includes a screwdriver 1 and a screw 2. The screwdriver 1 and the screw 2 are used together. The screwdriver 1 can tighten the screw 2 onto other parts and unscrew the screw 2 that is fastened to other parts.
[0029] The structure of screwdriver 1 is as follows Figure 2 and 3 As shown, the tool includes a handle 11 and a tool holder 12, both of which are rod-shaped and connected in an L-shape. The tool holder 12 includes a cutting head 121 and a rod body 122. The two ends of the rod body 122 are connected to the handle 11 and the cutting head 121, respectively. In other words, the end of the tool holder 12 furthest from the handle 11 is the cutting head 121, and the central axis of the cutting head 121 is aligned with the length direction of the tool holder 12. The rod body 122 has a cylindrical structure.
[0030] The prototype of the cutter head 121 is a structure with a parabolic outer surface. After removing material from this structure, the cutter head 121 is formed, and a groove is formed at the position where the material is removed, which is called the cutter head groove 13. There are three cutter head grooves 13, which are symmetrically and evenly arranged around the central axis of the cutter head 121. Obviously, the three cutter head grooves 13 are not connected to each other.
[0031] In a cross-section perpendicular to the central axis of the cutter head 121, the cutter head groove 13 is a fan-shaped groove with rounded corners. In other words, the cutter head groove 13 includes two sidewalls and a bottom surface. The two sidewalls are planar and not parallel to each other. The bottom surface is a concave curved surface, and the two sides of the bottom surface are smoothly connected to the two sidewalls.
[0032] Preferably, the cutter groove 13 extends along the central axis of the cutter head 121 to the middle of the rod body 122 near one end of the cutter head 121.
[0033] From an external perspective, each cutter head groove 13 and the portion between two adjacent cutter head grooves 13 are basically the same size. In other words, in the same plane perpendicular to the central axis of the cutter head 121, the shape and size of the projected shape of the cutter head groove 13 are basically the same as the shape and size of the projected shape of the portion of the cutter head 121 between two adjacent cutter head grooves 13.
[0034] Along the central axis of the cutter head 121, the shape and size of one end face of the cutter head 121 connecting to the rod 122 are the same as the cross-section of the rod 122. The end of the cutter head 121 away from the rod 122 is set as a planar end face, such as... Figure 3 As shown in a, rather than the tip, and the area of the plane is relatively smaller than the area of the other end face, the plane end face of the cutter head 121 away from the rod body 122 and the curved outer surface of the cutter head 121 transition smoothly.
[0035] Screw 2 includes a head 21 and a shank 22, such as Figure 4 and 5 As shown, the top of the head 21 is a protruding curved surface. The top of the head 21 is provided with a screw groove 211 in the shape of a trilobal groove, which tapers from the head 21 toward the rod 22.
[0036] The cutter head 121 is the part that can be inserted into the screw slot 211 and contact the screw 2 when in use. When the cutter head 121 is inserted into the screw slot 211, all the walls (side walls and bottom surface) of the screw slot 211 are completely in contact with the cutter head 121. At this time, the cutter head 121 is fully or partially inserted into the screw slot 211.
[0037] Based on the above, the specific shape of the screw slot 211 is defined as follows (see...). Figure 4 The screw slot 211 can be considered as comprising three interconnected unit slots, which are symmetrically and evenly arranged around the same center, forming a groove with a trefoil-like shape. Each unit slot includes three sidewalls and one bottom surface, and the three unit slots share a common bottom surface, as shown below. Figure 4 As shown in b, each unit slot has three sidewalls, including a curved surface and two planes. The two sides of the curved surface are smoothly connected to the two planes respectively. The curved surface is a parabola. The two planes are connected to the planes of the other two unit slots respectively, and the connection is smooth.
[0038] When the cutting head 121 is inserted into the screw slot 211, the cutting head 121 structure between two adjacent cutting head slots 13 is inserted into the unit slot, the curved side wall of the unit slot contacts the curved outer surface of the cutting head 121, and the two planar side walls of the same unit slot contact the side wall surfaces of the two adjacent cutting head slots 13 respectively; the head 21 structure between two adjacent unit slots is inserted into the cutting head slot 13; the end face a of the cutting head 121 contacts the bottom surface b of the screw slot 211, and the connection between two adjacent unit slots contacts the curved bottom surface of the cutting head slot 13.
[0039] The rod 22 is provided with external threads. The tail of the rod 22 (the end away from the head 21) can be set as a flat tail or a pointed tail. A flat tail means that the end is flat, and a pointed tail means that the end is pointed.
[0040] In this embodiment, both the screwdriver 1 and the screw 2 are made of metal.
[0041] Finally, it is necessary to state that the above embodiments are only used to further illustrate the technical solution of this utility model in detail, and should not be construed as limiting the scope of protection of this utility model. Any non-essential improvements and adjustments made by those skilled in the art based on the above content of this utility model shall fall within the scope of protection of this utility model.
Claims
1. A profiled fastening kit, characterized in that, The utility model relates to a screwdriver (1) and a screw (2), the screwdriver (1) and the screw (2) are used in cooperation, the screw (2) includes a head (21) and a rod (22), the top of head (21) is equipped with a three-lobed line shape screw slot (211) as a groove, from the head (21) to the direction of rod (22), the screw slot (211) is tapered, the bit (121) of screwdriver (1) is the part that can be inserted into screw slot (211) and contacts with screw (2) when using, the bit (121) is the structure that removes material on the surface of rotation paraboloid.
2. The fastening kit of claim 1, wherein: The bit (121) is equipped with three bit grooves (13), the bit groove (13) is the groove that removes material on the surface of rotation paraboloid, three bit grooves (13) are arranged around the central axis of symmetry of bit (121).
3. The fastening assembly of claim 1 or 2, wherein: When the bit (121) is inserted into the screw slot (211), all wall surfaces of the screw slot (211) are attached to the bit (121), at this time, the bit (121) is inserted into the screw slot (211) entirely or partially.
4. The fastening kit of claim 3, wherein: The bottom surface of the screw slot (211) is a plane, the end surface of the bit (121) is a plane, and the end surface of the bit (121) contacts the bottom surface of the screw slot (211) when the bit (121) is inserted into the screw slot (211).
5. The fastening assembly of claim 3, wherein: The screwdriver (1) includes a handle (11) and a bit rod (12), both of which are rod-shaped, and are connected into an L shape, the end of the bit rod (12) away from the handle (11) is the bit (121), and the central axis direction of the bit (121) is consistent with the length direction of the bit rod (12).
6. The fastening assembly of claim 5, wherein: The bit rod (12) includes the bit (121) and a rod body (122), both ends of the rod body (122) are connected to the handle (11) and the bit (121) respectively, and the bit groove (13) extends to the end of the rod body (122) close to the bit (121) in the central axis direction of the bit (121).
7. The fastening assembly of claim 5, wherein: In the cross section perpendicular to the central axis direction of the bit (121), the shape of the bit groove (13) is a scallop with rounded corners.
8. The fastening assembly of claim 5, wherein: The top of the head (21) is an outwardly protruding curved surface.