TWI682103B - Fastener - Google Patents

Abstract

A fastener includes a plurality of cutting portions formed on a bottom face of a head, a plurality of cutting ribs protruding from the bottom face and extending radially from a shank, and a plurality of accommodation rooms formed between the cutting portions and the cutting ribs. During the screwing operation, the cutting ribs cooperate with the cutting portions to cut unbroken fibers come from a threaded portion into debris continuously and scrape the debris off, and the accommodation rooms help receive part of debris to assist the head in engaging with a workpiece firmly. Further, remnants and a bulge can be fully pressed down by a projecting blade formed circumferentially of a top face of the head when the head is gradually screwed into the surface of the workpiece to allow the head to fit level with the surface of the workpiece efficiently, thereby increasing the fastening effect after the fastener is fixed in position.

Description

Lock firmware

The invention relates to a design of a locking member, in particular to a locking member that improves the locking flatness and the effect of locking force.

Referring to FIGS. 1 and 2, the conventional screw includes a screw head 11, a rod body 12 extending outward from the screw head 11, and a locking portion 13 opposite to the screw head 11 and formed at the other end of the rod body 12 , And a screw 14 provided on the rod body 12 with a spiral ring; wherein, the screw head 11 has a top surface 111, a conical bottom surface 112 opposite to the top surface 111, and a plurality of intervals are provided on the bottom surface The cutting rib 113 on 112; therefore, when the screw 2 is locked and positioned in the lock compound 2 with wood fiber, the lock part 13 is first pressed against a lock compound 2, and a tool is used (Not shown in the figure) is driven to link the screw head 11 so that the locking portion 13 locks into the lock compound 2 until the bottom surface 112 of the screw head 11 comes into contact with the lock compound 2, At this time, the cutting ribs 113 are used to cut the fibers that are not cut during the locking process, so that the screw head 11 can be locked and positioned on the lock compound 2.

However, after actual use, it was found that because the wood fibers of the lock compound 2 have elastic recovery properties, during the locking process of the cutting ribs 113, the strip-shaped and spaced-apart cutting ribs 113 can only produce rolling on the wood fibers Pressure, but cannot effectively cut the fiber, resulting in a limited cutting effect. At the same time, when the uncut fiber will contact the surface of the lock compound 2 with the screw head 11, a part of the periphery of the screw head 11 is formed The raised burrs prevent the screw head 11 from flatly adhering to the surface of the lock compound 2, resulting in poor flatness and locking effect after locking, which needs to be improved.

Therefore, the purpose of the present invention is to provide a locking member that can increase the flatness of the screw head to the surface of the lock compound after locking, and avoid the occurrence of burrs around the screw head.

Therefore, the fastener of the present invention includes a screw head, a rod body, a locking portion, and a thread segment; wherein, the screw head has a top surface, and a bottom surface that extends downward from the top surface and is tapered to form A plurality of cutting bodies on the bottom surface, a plurality of cutting ribs convexly provided on the bottom surface, and a plurality of receiving regions formed between the cutting bodies and the cutting ribs, and each of the foregoing cutting systems is directed from the bottom surface to the The rod body extends in a direction, and each cutting body has a pressing surface forming an outer periphery of the top surface and extending toward the rod body, a connecting surface and a tangent surface respectively connected to the pressing surface, and a connecting surface The cutting edge formed by the surface and the cutting surface; in addition, the cutting ribs project on the bottom surface and extend radially outward from the rod body, and at the same time, each of the ribs has two top detent walls projecting from the bottom surface, respectively , And the two top detent walls are connected to form a guide edge; therefore, when locked, the ribs of the locking member can be cut by the cutting ribs firstly after the screw thread of the screw is not cut, And the cutting bodies are successively scraped off the chips, and at the same time, the storage areas are used to assist in providing a cooperative setting in which part of the chips are accommodated, so that they can have a close effect with the lock compound. In addition, when When the screw head is continuously sunk, the design of each pressing surface extending from the periphery of the top surface to the rod body can gradually burr and convex when the screw head gradually contacts the surface of the lock compound The starting material is fully pressed into the hole of the lock compound, so the whole of the lock can not only effectively reduce the resistance of the lock, but also make the flatness of the screw head flat on the surface of the lock compound after the twist lock can be greatly improved Effective embankment lift, thereby effectively accelerating the efficiency of locking and stable positioning.

The foregoing and other technical contents, features and effects of the present invention will be clearly understood in the following detailed description with reference to the preferred embodiments of the drawings.

Referring to FIGS. 3 to 5, in the first preferred embodiment of the present invention, the locking member 3 includes a screw head 31, a rod body 32 extending outward from the screw head 31, and a screw head 31 opposite to and formed in The locking portion 33 at the other end of the rod body 32, and a screw segment 34 provided on the rod body 32 with a spiral ring; wherein, the locking portion 33 may be in the state of a drill tail, a pointed tail, etc. in this embodiment In the following description, the pointed tail structure is used as an example.

Following the foregoing, the screw head 31 has a top surface 311, a bottom surface 312 extending downward from the top surface 311 in a tapered shape and connected to the rod body 32, a plurality of cutting bodies 313, a plurality of protrusions formed on the bottom surface 312 Cutting ribs 314 provided on the bottom surface 312 and extending radially outwards from the rod body, and a plurality of accommodating regions 315 formed between the cutting bodies 313 and the cutting ribs 314; wherein, each cutting body 313 extends from the top surface 311 toward the rod body 32, especially the cutting body 313 preferably extends toward the rod body 32 but is not connected to the rod body 32, and each cutting body 313 has a formation The pressing surface 3131 extending from the outer periphery of the top surface 311 and extending toward the rod body 32 is connected to the connecting surface 3132 and the cutting surface 3133 of the pressing surface 3131, and the connecting surface 3132 is connected to the cutting surface 3133 The cutting edge 3134 is formed, and the pressing surface 3131 extends from the top surface 311 toward the rod body 32, and can form a tapered design, while the connecting surface 3132 is cut from the cutting body 313 The cutting edge 3134 extends to the cutting surface 3133 of another adjacent cutting body 313, for example, as shown in FIGS. 4 and 5, the connecting surface 3132 can extend to connect to the bottom edge of the other adjacent cutting surface 3133 opposite to the cutting edge 3134, so that The cutting bodies 313 can be continuously connected to form a step-like configuration, and in this embodiment, the connecting surface 3132 can be designed as an arc-shaped surface, so that the cutting edge 3134 is curved due to the arc of the connecting surface 3132 The surface is designed to form an inclined arrangement; in addition, the cutting ribs 314 can be arranged at intervals, and can be connected or not connected to the rod body 32, where the cutting ribs 314 are connected to the rod body 32 For example, and each of the ribs 314 has two top detent walls 3141 respectively protruding from the bottom surface 312 and can be arranged in an arc shape, and the two top detent walls 3141 are connected to form a guide edge 3142, and each The top detent wall 3141 of all the ribs 314 is also arc-shaped to facilitate cutting.

Furthermore, the extension of the aforementioned cutting ribs 314 may correspond to the cutting bodies 313, for example: at least one end of each rib 314 extends from the rod body 32, and the other end extends to connect to each cutting On the body 313 (as shown in FIGS. 4 and 5), of course, the other end may also be adjacent to but not in contact with the cutting body 313 (not shown in the figure), and the other end of the cutting rib 314 may extend to meet To any of the aforementioned faces of the cutting body 313, here only the ribs 314 extending from the rod body 32 to be connected to each connecting surface 3132 are shown; alternatively, as shown in FIGS. 6 to 7 As shown, the cutting ribs 314 respectively extend corresponding to a portion of the cutting body 313, so that when one end of the cutting ribs 314 extends radially outward from the rod body 32, the other end of the cutting ribs 314 is partially The cutting body 313 cooperates so that part of the cutting body 313 can be matched with the extension of the cutting rib 314, while another part of the cutting body 313 is not matched with the extension of the cutting rib 314 (as shown in FIG. 8). The extension of the rib 314 can be extended to be connected to any surface of the cutting body 313 (such as the connection surface 3132; refer to FIGS. 7 and 8), or can be extended to the vicinity of the cutting body 313 (not shown) Therefore, each accommodating area 315 can be formed between the cutting body 313 and the rod body 32 and between the two adjacent cutting ribs 314, and the following description of the implementation action only uses the structure shown in FIG. 6 as an example To explain; as for the accommodating area 315, the arc surface design factor of the connecting surface 3132 is used to effectively expand the accommodating space of the accommodating area 315.

In particular, in this embodiment, a pressing tooth 35 can be further provided on the rod body 32, and the pressing tooth 35 is located between the screw segment 34 and the screw head 31. The tooth 35 may be in a spiral shape, and the spiral angle of the pressing tooth 35 may be different from the spiral angle of the screw segment 34 to continue the screw segment 34 for subsequent locking.

Referring to FIGS. 6 to 9, when performing screw cooperation, a driving tool (not shown) is used to apply a locking torque to the screw head 31, so that the locking portion 33 simultaneously drives the screw segment 34 to drill A hole 41 is formed on a lock compound 4 (if it is a hardwood material), and the fiber of the lock compound 4 is cut at the same time, so that the lock member 3 can be quickly screwed into the lock compound 4 , And when the pressing tooth 35 continues the screw segment 34 into the lock compound 4, the pressing tooth 35 and the screw segment 34 are arranged in different thread forms, plus the lock compound The elastic recovery characteristics of the fiber of 4 can push the chips inward, so that the pressing tooth 35 can be firmly engaged with the inner wall of the lock compound 4 to prevent loosening until the screw head 31 When advancing toward the surface of the lock compound 4, the leading edge 3142 of the cutting ribs 314 can be used as a guide for pre-cutting, that is, the guide edge 3142 is aimed at the drill adjacent to the lock compound 4 The fiber around the hole 41 is not cut by the thread segment 34, and at the same time, the width of the hole 41 is gradually increased during the cutting process, and then the cutting edge 3134 continues to cut, so the cutting edge 3134 cooperates with the guide edge 3142 to achieve progressive double cutting to cut and scrape the fiber, thus effectively preventing the screw head 31 from being improperly entangled by the unbroken fiber and generating locking resistance. During the cutting process, the curved surface design of the connecting surface 3132 connected to the cutting edge 3134 is used to enable part of the chips generated during locking to be discharged outward along the connecting surface 3132 to avoid excessive accumulation of chips In the lock compound 4, in order to reduce the locking resistance and avoid the cracking of the material, at the same time, the increased accommodation space of the accommodating areas 315 can also provide accommodating of some chips, so that the locking member 3 and The lock compound 4 produces a tight meshing effect to improve the locking force, and effectively prevents the chip from being unable to accommodate and cause the lock compound 4 to generate cracks. Furthermore, when the screw head 31 gradually sinks into the lock When compound 4 is inside, if there are still fibers or chips protruding out of the bore 41 on the surface of the lock compound 4 to produce burrs or form protrusions (as shown in FIG. 9), then you can borrow The extended design of the pressing surface 3131 is to press the burrs, protrusions and parts toward the surface (as shown in FIG. 10), so that the burrs or protrusions are completely pressed into the lock compound 4 in the drilling hole 41, so that the top surface 311 of the screw head 31 after locking positioning is flush with the surface of the lock compound 4 (as shown in FIG. 11), thereby enhancing the locking after locking The flatness of the object 4 flatly attached to the locking member 3 is more beneficial to improve the tightening force after locking.

Referring to FIG. 12, the second preferred embodiment of the present invention still includes the main components described in the previous embodiment, and this embodiment is particularly characterized in that the screw segment 34 has a locking portion 33. The tapping tooth 341 is composed of a curved tooth 342 connected to the tapping tooth 341, and a locking tooth 343 connected to the curved tooth 342, wherein the peak of the curved tooth 342 has a high-low curve Radian to form a wave state as shown in the figure, and the maximum outer diameter D2 of the curved tooth 342 is smaller than the maximum outer diameter D3 of the locking tooth 343 and greater than the maximum outer diameter D1 of the tapping tooth 341; Therefore, the tapping teeth 341, the curved teeth 342, and the locking teeth 343 are provided by the thread segments 34 having different tooth diameters, so that during the locking process, the tapping teeth 341 first assist the locking portion 33 When drilling a lock, first perform a preliminary drilling effect, and then use the shape of the curved teeth 342 different from the tapping 341 design, so that the curved teeth 342 along the tapping 341 screw The trajectory is entered to carry out different screw cutting effects, that is, the curved tooth 342 can increase the cutting point to enhance the cutting effect to achieve rapid cutting and reduce resistance, and the wave-shaped design of the curved tooth 342 is not only for chip removal, At the same time, part of the chips can be accommodated inside, which is beneficial to prevent loosening and avoid cracking. The maximum outer diameter D2 of the curved tooth 342 is greater than the maximum outer diameter D1 of the tapping tooth 341, which is more conducive to hole expansion and chip removal. Then, when the locking tooth 343 with a larger outer diameter D3 is successively locked, a part of the chips from the curved teeth 342 can be pressed inward again to increase the distance between the locking tooth 343 and the lock compound 4 (Not shown in the figure) the bite force to increase the pulling force; therefore, the use of the screw segment 34 has three different types of screw 341, 342, 343 overall spiral pattern, which can facilitate rapid drilling and reduce rotation Resistance, as well as avoiding the occurrence of cracking due to improper accumulation of cutting chips caused by the lock compound 4 made of hardwood, and at the same time, it is conducive to the improvement of the flatness of the flat surface of the screw head 31 after the subsequent spin lock, and can be more stable Locking positioning effect.

Referring to FIG. 13, a third preferred embodiment of the present invention still includes the components described in the second preferred embodiment. What is special about this embodiment is that each curved tooth 342 is provided with The multiple incisors 3421 are designed, and the incisors 3421 are arranged in different directions according to the different curvature of the curved teeth 342. Therefore, the design of the multiple incisors 3421 on the curved teeth 342 can assist in lifting The drilling and cutting ability of the thread segment 34 and the rapid chip removal also contribute to the chip removal operation. At the same time, the friction resistance and torque generated during screwing can be greatly reduced effectively. Of course, these cutting teeth 3421 can also be used to lock At the time, it can accommodate chips to improve the bite between the locking member 3 and the lock compound 4, thereby increasing the pulling force, not only improve the locking efficiency, but also effectively increase the whole of the lock member 3 and the lock compound The tightening force between 4 (not shown in the figure) is also conducive to the improvement of the flatness of the flat surface of the screw head 31 after the subsequent twist lock, so that a stable locking positioning effect is achieved.

Summarizing the foregoing, the locking member of the present invention is provided with a plurality of cutting bodies on the bottom surface of the screw head, a plurality of cutting ribs and a plurality of accommodating areas provided on the bottom surface, so that when locking, the cutting The ribs and the cutting body cooperate with each other to produce a double cutting effect. By continuous cutting, the chips that are not chopped when the locking member is screwed are scraped off, effectively reducing the locking torque, and the receiving areas It can also help to provide some chip accommodation after cutting, thereby effectively improving the tightness of the lock, and at the same time, the burrs and protrusions formed around the drill hole of the lock compound during the lock can also continue to sink in the screw head At the time of entering, it will be fully pressed by the cutting body together, so that the flatness after locking can be greatly effectively raised, and after locking, it also has the effect of greatly improving the tightening force after locking, etc. The purpose of the invention.

However, the above are only for explaining the preferred embodiments of the present invention, but the scope of the implementation of the present invention cannot be limited by this, that is, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the description of the invention , Should still fall within the scope of this invention patent.

(Convention)

1‧‧‧screw

11‧‧‧screw head

12‧‧‧Pole

13‧‧‧ Locking Department

14‧‧‧screw

111‧‧‧Top

112‧‧‧Bottom

113‧‧‧ Rib cutting

2‧‧‧lock

21‧‧‧Drilling

(this invention)

3‧‧‧Lock firmware

31‧‧‧screw head

32‧‧‧Bar

33‧‧‧ Locking Department

34‧‧‧Screw section

35‧‧‧Fighting teeth

311‧‧‧Top

312‧‧‧Bottom

313‧‧‧Cutting body

314‧‧‧ Rib cutting

315‧‧‧accommodation area

3131‧‧‧Press noodle

3132‧‧‧Connecting surface

3133‧‧‧Cut

3134‧‧‧Cutting blade

3141‧‧‧top wall

3142‧‧‧Guiding Blade

341‧‧‧Tapping

342‧‧‧Bent teeth

343‧‧‧locking teeth

3421‧‧‧cutting

D1‧‧‧Tapping outer diameter

D2‧‧‧Outer diameter of curved teeth

D3‧‧‧Outer diameter of locking teeth

4‧‧‧ lock compound

4 1‧‧‧Drilling

Figure 1 is a schematic diagram of a conventional screw. FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1. FIG. 3 is a schematic diagram of an embodiment of the first preferred embodiment of the present invention. 4 and 5 are schematic cross-sectional views taken along the line B-B in FIG. 3. 6 is a schematic diagram of another embodiment of the first preferred embodiment of the present invention. 7 and 8 are schematic cross-sectional views taken along line C-C in FIG. 6. 9 to 11 are schematic views of the locked state of the first preferred embodiment. 12 is a schematic diagram of the second preferred embodiment of the present invention. 13 is a schematic diagram of the third preferred embodiment of the present invention.

3‧‧‧Lock firmware

31‧‧‧screw head

32‧‧‧Bar

33‧‧‧ Locking Department

34‧‧‧Screw section

35‧‧‧Fighting teeth

311‧‧‧Top

312‧‧‧Bottom

313‧‧‧Cutting body

314‧‧‧ Rib cutting

315‧‧‧accommodation area

Claims (10)

A locking member includes a screw head, a rod body extending outward from the screw head, a locking portion formed on the other end of the rod body opposite to the screw head, and a spiral ring provided on the rod body Thread segment; wherein, the screw head has a top surface, a bottom surface extending downward from the top surface and being tapered and connected to the rod body; characterized in that: the screw head includes a formed on the bottom surface A plurality of cutting bodies, a plurality of cutting ribs convexly provided on the bottom surface, and a plurality of accommodating regions formed between the cutting bodies and the cutting ribs; wherein, each cutting system faces the rod from the top surface Extending, and each cutting body has a pressing surface formed on the outer periphery of the top surface and extending toward the rod body, respectively connecting the connecting surface and the cutting surface of the pressing surface, and a connecting surface and the cutting surface The cutting edges formed by the joints of the cutting planes; in addition, the cutting ribs protrude from the bottom surface and extend radially outwards from the rod body, and the other end of the cutting ribs can extend to meet the foregoing of the cutting body On any surface, at the same time, each of the ribs has two top detent walls respectively protruding from the bottom surface, and the two top detent walls are connected to form a guide edge. The fastener according to item 1 of the scope of the patent application, wherein at least the extension of each rib corresponds to each cutting body. The fastener according to item 2 of the patent application scope, wherein the pressing surface is tapered from the top surface toward the rod body, while each connecting surface extends from the cutting edge of the cutting body to another Adjacent to the cutting plane of the cutting body. The fastener according to item 1 of the patent application scope, wherein the cutting ribs respectively extend to correspond to a part of the cutting body, and each accommodating area is formed between the cutting body and the rod body and is located in two phases Between adjacent cut ribs. The fastener according to item 4 of the patent application scope, wherein the pressing surface is tapered from the top surface toward the rod body, and each connecting surface extends from the cutting edge of the cutting body to another A cutting plane of an adjacent cutting body. The lock fastener according to any one of items 1 to 5 of the patent application range, wherein the thread segment has a tapping tooth provided on the locking portion, a curved tooth connected to the tapping tooth, and A locking tooth connected to the curved tooth, and the maximum outer diameter of the curved tooth is smaller than the maximum outer diameter of the locking tooth. The fastener according to item 6 of the patent application scope, wherein each curved tooth is provided with a plurality of incisors. According to the locking member described in any one of items 1 to 5 of the patent application scope, a pressing tooth located between the thread segment and the screw head is further provided on the rod body. The fastener according to any one of items 1 to 5 of the patent application scope, wherein the top detent wall of each rib is designed in an arc shape. The lock fastener according to any one of items 1 to 5 of the patent application scope, wherein the connecting surface is designed as an arc surface.

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