CN110792670A

CN110792670A - Locking part

Info

Publication number: CN110792670A
Application number: CN201810877912.5A
Authority: CN
Inventors: 苏国材
Original assignee: Qingda Technology Co Ltd
Current assignee: Qingda Technology Co Ltd; Taiwan Shan Yin International Co Ltd
Priority date: 2018-08-03
Filing date: 2018-08-03
Publication date: 2020-02-14

Abstract

The invention provides a locking piece, which is mainly characterized in that a plurality of cutting bodies, a plurality of cutting ribs and a containing area are respectively arranged on the bottom surface of a screw head, the cutting ribs protrude from the bottom surface and extend outwards and radially, and the containing area is formed between the cutting bodies and the cutting ribs, so that when the locking piece is locked, fibers which are not cut off during locking can be continuously cut by means of double cutting matching of the cutting ribs and the cutting bodies, cutting scraps are removed, the containing area is used for assisting to provide part of the cutting scraps to be contained in the containing area, the screw head and a locking object are tightly locked, burrs and protrusions are completely pressed in by pressing surfaces of the cutting bodies when the locking piece sinks, the flatness of the locked and positioned head flat-attached locking object is effectively improved, and the locking force after locking is greatly improved.

Description

Locking part

Technical Field

The invention relates to a locking piece design, in particular to a locking piece for improving locking flatness and locking force effect.

Background

As shown in fig. 1 and 2, the conventional screw includes a screw head 11, a rod 12 extending outward from the screw head 11, a locking portion 13 opposite to the screw head 11 and formed at the other end of the rod 12, and a screw thread 14 spirally surrounding the rod 12; the screw head 11 has a top surface 111, a tapered bottom surface 112 opposite to the top surface 111, and a plurality of cutting ribs 113 spaced apart from each other on the bottom surface 112; therefore, when the screw 2 is used to lock and position the locking element 2 with wood fibers, the locking portion 13 is first pressed against the locking element 2, and a tool (not shown) is used to drive the screw head 11, so that the locking portion 13 is locked into the locking element 2 until the bottom surface 112 of the screw head 11 contacts the locking element 2, and the cutting ribs 113 are used to cut the fibers that are not cut off during the locking process, so that the screw head 11 is locked and positioned on the locking element 2.

However, after practical use, it is found that, because the wood fiber of the locking compound 2 has elastic recovery characteristics, in the locking process of the cutting ribs 113, the cutting ribs 113 which are arranged at intervals and are in a strip shape only roll the wood fiber, but cannot effectively cut the fiber, so that the cutting effect is limited, and meanwhile, when the fiber which is not cut is in contact with the surface of the locking compound 2 along with the screw head 11, a part of convex burrs are formed on the periphery of the screw head 11, so that the screw head 11 cannot be smoothly attached to the surface of the locking compound 2, and the flatness and the locking effect after locking are poor, which needs to be improved.

Disclosure of Invention

Therefore, an object of the present invention is to provide a fastener, which can increase the flatness of the screw head engaging with the surface of the locking object after locking, and avoid the occurrence of burrs around the screw head.

Therefore, the locking and fixing part comprises a screw head, a rod body, a locking part and a screw thread section; the screw head is provided with a top surface, a conical bottom surface extending downwards from the top surface, a plurality of cutting bodies formed on the bottom surface, a plurality of cutting ribs convexly arranged on the bottom surface, and a plurality of accommodating areas formed between the cutting bodies and the cutting ribs, wherein each cutting body extends from the bottom surface towards the rod body direction, and is provided with a pressing surface forming the outer periphery of the top surface and extending towards the rod body direction, a connecting surface and a tangent plane respectively connected with the pressing surface, and a cutting edge formed by connecting the connecting surface and the tangent plane; in addition, the cutting ribs protrude from the bottom surface and extend radially outward from the rod body, and each cutting rib has two top retaining walls protruding from the bottom surface, and the two top retaining walls are connected to form a guiding blade.

As a further development of the invention, at least one extension of each rib corresponds to each cutting body.

As a further improvement of the present invention, 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 the cutting surface of another adjacent cutting body.

As a further improvement of the present invention, the cutting ribs extend to correspond to part of the cutting bodies, and each receiving area is formed between the cutting body and the rod body and between two adjacent cutting ribs.

As a further improvement of the invention, the thread section has a tapping thread arranged on the locking portion, a bent thread connected to the tapping thread, and a locking thread connected to the bent thread, and the maximum outer diameter of the bent thread is smaller than the maximum outer diameter of the locking thread.

As a further improvement of the invention, each curved tooth is provided with a plurality of cutting teeth.

As a further improvement of the invention, a fastening tooth positioned between the thread section and the thread head is arranged on the rod body.

As a further improvement of the invention, the top wall of each rib is of arcuate design.

As a further improvement of the invention, the connecting surface is designed into an arc surface.

The invention has the advantages that:

when the locking piece is locked, the cutting ribs are used for cutting fibers which are not cut off after the threads of the locking piece are screwed together in a rotary cutting mode, then the cutting bodies are used for continuously scraping cutting scraps, meanwhile, the accommodating areas are used for assisting to provide matching arrangement for accommodating part of the cutting scraps in the accommodating areas, so that the locking piece can be tightly locked with the locking piece, when the screw head sinks continuously, the design that each pressing surface extends from the periphery of the top surface to the rod body is adopted, and when the screw head gradually contacts the surface of the locking piece, burrs and protrusions can be completely pressed into a drilling hole of the locking piece, so that the locking resistance of the whole locking piece can be effectively reduced, and meanwhile, the flatness of the screw head which is flatly attached to the surface of the locking piece after the screw locking can be greatly and effectively improved, and the locking and stable positioning efficiencies can be effectively accelerated.

Drawings

FIG. 1 is a schematic view of a conventional screw;

FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic diagram of an implementation of the first preferred embodiment of the invention;

FIG. 4 and FIG. 5 are schematic sectional views B-B of FIG. 3;

FIG. 6 is a schematic diagram of another embodiment of the present invention;

FIGS. 7 and 8 are schematic cross-sectional views C-C of FIG. 6;

FIG. 9-11 are the password lock of the first preferred embodiment;

FIG. 12 is a schematic diagram of a second preferred embodiment of the present invention;

FIG. 13 is a schematic view of a third preferred embodiment of the present invention.

Description of the symbols:

the prior art is as follows:

1. a screw; 11. a screw head; 12. a rod body; 13. a locking portion; 14. screw teeth; 111. a top surface; 112 bottom surface; 113. cutting ribs; 2. a locked compound; 21. drilling;

the invention comprises the following steps:

3. a locking member; 31. a screw head; 32. a rod body; 33. a locking portion; 34. a thread section; 35. tightening the teeth; 311. a top surface; 312. a bottom surface; 313. a cutting body; 314. cutting ribs; 315. an accommodating area; 3131. pressing the dough; 3132. a connecting surface; 3133. cutting into noodles; 3134. cutting edges; 3141. a top wall; 3142. a guide blade; 341. tapping; 342. bending teeth; 343. locking teeth; 3421. cutting teeth; d1, tapping outer diameter; d2, bending tooth outer diameter; d3, locking tooth outer diameter; 4. a locked compound; 41. and (6) drilling.

Detailed Description

These and other aspects, features and advantages of the present invention will become apparent from the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings.

As shown in fig. 3-5, in the first preferred embodiment of the present invention, the locking member 3 comprises a screw head 31, a rod 32 extending outward from the screw head 31, a locking portion 33 opposite to the screw head 31 and formed at the other end of the rod 32, and a screw thread section 34 spirally surrounding the rod 32; the locking portion 33 may be configured as a drill tail, a pointed tail, etc. in the present embodiment, the pointed tail structure is taken as an example in the following description.

Continuing above, the screw head 31 has a top surface 311, a bottom surface 312 extending downward from the top surface 311 in a cone shape and connected to the rod 32, a plurality of cutting bodies 313 formed on the bottom surface 312, a plurality of cutting ribs 314 protruding from the bottom surface 312 and extending radially outward from the rod, and a plurality of receiving areas 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 32, and more particularly, each cutting body 313 preferably extends toward the rod 32 but is not connected to the rod 32, and each cutting body 313 has a pressing surface 3131 formed on the outer periphery of the top surface 311 and extending toward the rod 32, a connecting surface 3132 and a cutting surface 3133 respectively connected to the pressing surface 3131, and a cutting edge 3134 formed between the connecting surface 3132 and the cutting surface 3133, and the pressing surface 3131 extends from the top surface 311 toward the rod 32 and is tapered, and each connecting surface 3132 extends from the cutting edge 3134 of the cutting body 313 to the cutting surface 3133 of another adjacent cutting body 313, for example, as shown in fig. 4 and 5, the connecting surface 3132 can extend to connect to the bottom edge of the cutting edge 3134 of the another adjacent cutting body 3131, so that the cutting bodies 313 can be connected continuously to form a stepped configuration, in this embodiment, the connecting surface 3132 may have an arc-shaped surface design, so that the cutting edge 3134 forms an inclined configuration due to the arc-shaped surface design of the connecting surface 3132; the cutting ribs 314 may be disposed at intervals and may be connected to or disconnected from the rod 32, and the cutting ribs 314 are connected to the rod 32, and each cutting rib 314 has two top pulling walls 3141 protruding from the bottom surface 312 and disposed in an arc shape, and the two top pulling walls 3141 are connected to form a guiding edge 3142, and the top pulling wall 3141 of each cutting rib 314 is also designed in an arc shape to facilitate the cutting action.

Further, the above-mentioned cutting ribs 314 may extend corresponding to the cutting bodies 313, for example: at least one cutting rib 314 extends from the shaft 32 at one end thereof to connect to each cutting body 313 (as shown in fig. 4 and 5), but may also extend adjacent to but not connect to the cutting body 313 (not shown), and the other end of the cutting rib 314 may extend to connect to either side of the cutting body 313, only each cutting rib 314 extending from the shaft 32 to connect to each connecting surface 3132 shown here; alternatively, as shown in fig. 6 to 7, the cutting ribs 314 respectively extend to correspond to part of the cutting body 313, so that when one end of each cutting rib 314 extends radially outward from the rod 32, the other end of each cutting rib 314 is matched with part of the cutting body 313, so that part of the cutting body 313 can be matched with the extension of the cutting rib 314, and the other part of the cutting body 313 is not matched with the extension of the cutting rib 314 (as shown in fig. 8), and similarly, the extension of each cutting rib 314 can extend to be connected to any surface (such as a connecting surface 3132; as shown in fig. 7 and 8) of the cutting body 313 or extend to be adjacent to the cutting body 313 (not shown), so that each accommodating area 315 can be formed between the cutting body 313 and the rod 32 and between the two adjacent cutting ribs 314, and the following description of the operation only takes the structure shown in fig. 6 as an example; as for the accommodating area 315, the accommodating space of the accommodating area 315 is effectively enlarged by the design factor of the arc-shaped surface of the connecting surface 3132.

Particularly, in the present embodiment, a fastening tooth 35 is further disposed on the rod 32, and the fastening tooth 35 is located between the thread section 34 and the screw head 31, the fastening tooth 35 can be in a spiral shape, and the spiral angle of the fastening tooth 35 can be different from the spiral angle of the thread section 34, so as to connect the thread section 34 for subsequent locking.

As shown in fig. 6 to 9, during the screwing operation, 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 section 34 to drill a drilling hole 41 formed on a locking compound 4 (such as hardwood material), and simultaneously cuts the fiber of the locking compound 4, so that the locking member 3 can be quickly screwed into the locking compound 4, and when the screw section 34 is inserted into the locking compound 4, the elastic recovery characteristic of the fiber of the locking compound 4 can push the chips inwards, so that the screw 35 can be firmly engaged with the inner wall of the locking compound 4, so as to achieve the anti-loosening effect, until when the screw head 31 advances toward the surface of the locking compound 4, the guiding blade 3142 of the cutting rib 314 is used as the guiding blade for the pre-cutting, that is, the guiding edge 3142 cuts the fiber which is adjacent to the periphery of the bore hole 41 of the locking compound 4 and is not cut by the thread section 34, and gradually enlarges the width of the bore hole 41 during the cutting process, and then the cutting edge 3134 cuts continuously, so that the cutting edge 3134 cooperates with the guiding edge 3142 to achieve a progressive double cutting action to cut and scrape the fiber, thereby effectively preventing the screw head 31 from being improperly wound by the unbroken fiber to generate locking resistance, and during the cutting process of the screw head 31, the arc surface design of the connecting surface 3132 connected with the cutting edge 3134 is utilized to make part of the chips generated during the locking process be discharged along the connecting surface 3132 to avoid excessive chips from being accumulated in the locking compound 4, thereby reducing the locking resistance and avoiding the cracking phenomenon, and the enlarged accommodating space of the accommodating area 315 can also provide part of the accommodation of the chips, therefore, the locking member 3 and the locking element 4 can be tightly engaged to improve the locking force, and the occurrence of material cracking of the locking element 4 caused by the situation that the chips cannot be accommodated is effectively avoided, furthermore, when the screw head 31 gradually sinks into the locking element 4, if fibers or chips still protrude out of the drilling hole 41 on the surface of the locking element 4 to generate burrs or form protrusions (as shown in fig. 9), the burrs, protrusions and parts of the protrusions are pressed in the surface direction (as shown in fig. 10) through the extension design of the pressing surface 3131, so that the burrs or protrusions are completely pressed into the drilling hole 41 of the locking element 4, and further, the top surface 311 of the screw head 31 after locking positioning can be flush with the surface of the locking element 4 (as shown in fig. 11), thereby improving the flatness of the locking element 4 flatly attached to the locking member 3 after locking, the fastening force after locking is further improved.

As shown in fig. 12, the second preferred embodiment of the present invention still includes the main components described in the previous embodiment, and the present embodiment particularly includes: the thread segment 34 has a tapping tooth 341 disposed on the locking portion 33, a curved tooth 342 connected to the tapping tooth 341, and a locking tooth 343 connected to the curved tooth 342, wherein the crest of the curved tooth 342 has a high and a low curvature to form a wave-like shape 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 larger than the maximum outer diameter D1 of the tapping tooth 341; therefore, the tapping 341, the bending tooth 342 and the locking tooth 343 with different diameters of the thread section 34 are provided, so that during the locking process, the tapping 341 assists the locking portion 33 to drill and lock, a preliminary drilling effect is firstly performed, and then the design of the tooth form of the bending tooth 342 different from that of the tapping 341 is utilized, so that the bending tooth 342 continuously performs different screwing actions along the screwing track of the tapping 341, that is, the bending tooth 342 can increase the cutting point to enhance the cutting effect to achieve rapid cutting and reduce resistance, meanwhile, the wave-shaped design of the bending tooth 342 not only can be used for chip removal, but also can be used for accommodating partial chips therein to facilitate loosening prevention and material cracking prevention, and the maximum outer diameter D2 of the bending tooth 342 is larger than the maximum outer diameter D1 of the tapping 341 to facilitate hole expansion and chip removal, and then the locking tooth 343 with a larger outer diameter D3 is locked, a portion of the cutting chips from the bent teeth 342 can be pressed inward to increase the engaging force between the locking teeth 343 and the locking element 4 (not shown) to increase the drawing force; therefore, the integral spiral shape of the thread section 34 with three different shapes of the threads 341, 342, 343 is beneficial to fast drilling and reducing the screwing resistance, and the occurrence of material cracking of the locking compound 4 made of hardwood material due to improper accumulation of chips is avoided, and the improvement of the flatness of the flat surface of the screw head 31 after subsequent screwing is also beneficial to the stable locking and positioning effect.

As shown in fig. 13, the third preferred embodiment of the present invention includes the components described in the second preferred embodiment, and the present embodiment particularly includes: each of the curved teeth 342 is provided with a plurality of cutting teeth 3421, and the cutting teeth 3421 are disposed in different directions according to different curvature of the curved teeth 342, therefore, the design of the plurality of cutting teeth 3421 on the curved teeth 342 can help to improve the drilling and tapping cutting ability of the thread section 34 and achieve fast cutting, and also facilitate the chip removal operation, meanwhile, the friction resistance and torsion generated during screwing can be greatly reduced, and certainly, the cutting teeth 3421 can be used for accommodating scraps during locking to enhance the engagement degree between the locking member 3 and the locking object 4, thereby increasing the drawing force, not only improving the locking efficiency, but also effectively increasing the fastening force between the whole locking member 3 and the locking member 4 (not shown), meanwhile, the flatness of the flat contact of the screw head 31 after subsequent screwing is improved, so that the stable locking and positioning effect is achieved.

Summarizing the above, the locking and fixing member of the present invention is designed by forming a plurality of cutting bodies, a plurality of cutting ribs and a plurality of accommodating areas on the bottom surface of the screw head, when locked, the cutting rib and the cutting body are mutually matched to generate double cutting action, the chips are scraped by the fibers which are not chopped when the locking piece is screwed in a continuous cutting mode, the locking torsion is effectively reduced, and the containing zones can further assist in containing the cut parts of the chips, therefore, the locking tightness can be effectively improved, and simultaneously, when the burr and the bulge which are formed around the drilling hole of the locking object during the locking process are continuously sunk in the screw head, the cutting body is pressed in completely, so that the flatness after locking can be greatly and effectively lifted, and after locking, the fastening force after locking is greatly improved, and the purpose of the invention can be really achieved.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A locking piece comprises a screw head, a rod body extending outwards from the screw head, a locking part which is opposite to the screw head and is formed at the other end of the rod body, and a screw tooth section which is spirally and annularly arranged on the rod body; wherein, the screw head is provided with a top surface and a conical bottom surface which extends downwards from the top surface and is connected with the rod body; the method is characterized in that:

the screw head comprises a plurality of cutting bodies formed on the bottom surface, a plurality of cutting ribs convexly arranged on the bottom surface, and a plurality of accommodating areas formed between the cutting bodies and the cutting ribs; each cutting body extends from the top surface to the rod body direction, and is provided with a pressing surface which is formed on the outer periphery of the top surface and extends towards the rod body direction, a connecting surface and a tangent plane which are respectively connected with the pressing surface, and a cutting edge formed by connecting the connecting surface and the tangent plane; in addition, the cutting ribs protrude from the bottom surface and extend radially outward from the rod body, and each cutting rib has two top pulling walls protruding from the bottom surface, and the two top pulling walls are connected to form a guiding blade.

2. The fastener of claim 1, wherein at least one rib extends from each cutting body.

3. The fastener of claim 2, wherein said clamping surface tapers from said top surface toward said shank, and each connecting surface extends from a cutting edge of said cutting body to a cutting surface of another adjacent cutting body.

4. The fastener of claim 1, wherein the ribs each extend to correspond to a portion of the cutting body, and each receiving area is formed between the cutting body and the shank and between two adjacent ribs.

5. The fastener of claim 4, wherein the clamping surface tapers from the top surface toward the shank, and each connecting surface extends from the cutting edge of the cutting body to a cutting face of another adjacent cutting body.

6. The fastener of any one of claims 1 to 5, wherein the thread section has a tapping thread provided on the locking portion, a bent thread connected to the tapping thread, and a locking thread connected to the bent thread, and the maximum outer diameter of the bent thread is smaller than the maximum outer diameter of the locking thread.

7. The fastener of claim 6, wherein each of the plurality of curved teeth has a plurality of cutting teeth formed thereon.

8. The fastener according to any one of claims 1-5, wherein a fastening tooth is further provided on the shank between the thread section and the head.

9. A fastener according to any one of claims 1 to 5, wherein the top wall of each rib is of arcuate design.

10. A locking element according to any one of claims 1 to 5, wherein the connecting surface is of arcuate design.