TWI837032B - Screw - Google Patents

Abstract

A screw mainly includes a head having a top surface, a conical surface opposite to the top surface, a plurality of cutting units extending circumferentially of the top surface, and a plurality of accommodation portions and ridge portions recessedly provided in the conical surface in an alternating manner. Accordingly, the cutting units sever fibers and scrape burrs which incur a ragged edge of a workpiece. The ridge portions cut fibers into chips and guide chips to the accommodation portions for suitable accommodation of chips inside the accommodation portions, thereby preventing the head from being entangled by unsevered fibers, avoiding unduly accumulation of the chips around the head, attaining a tight engagement between the screw and the workpiece, reducing screwing resistance, and allowing the top surface to fit level with a surface of the workpiece.

Description

screws

The present invention relates to a screw structure, in particular to a screw which can effectively cut fibers, scrape off burrs and increase chip space.

Referring to Figures 1 and 2, a conventional screw 1 includes a head 11, a rod 12 extending outward from the head 11, and a tail 13 located on the rod 12 and opposite to the head 11. , and a plurality of spiral rings provided with threads 14 on the rod body 12, wherein the head 11 has a top surface 111, and a cone 112 opposite to the top surface 111 and connected with the rod body 12, During the locking process of the screw 1, an object 2 is cut by the threads 14, and a locking hole 21 is cut out on the surface 22 of the object 2, and the threads 14 gradually move downward. During the rotary cutting process, it drives the rod body 12 to gradually sink into the object 2, and then pushes and squeezes the locking hole 21 through the cone 112 of the head 11 until the top surface 111 and the surface of the object 2 22 are flush, so that the locking operation of the screw 1 can be completed.

However, after actual use, it was found that when the screw threads 14 cut the object 2 downwards, it is easy to cause some fibers of the object 2 to protrude outward from the locking holes 21 to form burrs. The cone 112 of the part 11 is composed of a smooth surface, which not only cannot provide a chip-holding space, but the cone 112 can only be squeezed but cannot effectively cut off the fibers, so that the burrs around the locking hole 21 cannot be cut. It is effectively scraped and the uncut fibers are easily wrapped around the head 11. When the screw 1 is turned downwards, the head 11 will also be hindered by the elastic recovery force of the fibers. , which in turn leads to an increase in the locking resistance, and at the same time causes the screw 1 to be unable to fit tightly with the object 2. If the fibers continue to be squeezed, the object 2 is more likely to expand and crack, which needs to be improved.

Therefore, the purpose of the present invention is to provide a screw that can assist in cutting the fibers of an object, effectively scrape off burrs and increase chip space, thereby reducing locking resistance and improving flatness after locking.

Therefore, the screw of the present invention includes a rod, a head and a tail respectively arranged at two ends of the rod, and a plurality of screw threads arranged around the rod, wherein the head has a top surface, a cone connected to the rod and opposite to the top surface, a plurality of cutting teeth arranged in sequence on the outer periphery of the top surface, and a plurality of receiving parts recessed on the cone, and a convex rib is formed between any two adjacent receiving parts, so that when locked, the cutting teeth effectively cut the fiber around the locking hole of the object. The ribs can be used to remove the fibers from the head portion to avoid the fibers from being entangled with the head portion and to scrape off the burrs around the locking hole. Furthermore, the ribs can not only assist in the rotary cutting of the fibers, but also push the generated chips into the receiving portions. The receiving portions can then cooperate with the receiving portions to provide sufficient space for chips, so that the screw can fit closely with the object without any excess chips or fibers being accumulated around the head portion, thereby reducing the locking resistance and increasing the flatness of the screw after locking.

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

Referring to FIG. 3 , a first preferred embodiment of the present invention, the screw 3 comprises a head 31, a rod 32 connected to the head 31, a tail 33 disposed on the rod 32, and a plurality of spiral rings disposed on the rod 32. The tail 33 and the head 31 are disposed at two opposite ends of the rod 32, wherein the head 31 has a top surface. 311, a cone 312 opposite to the top surface 311, and the cone 312 is inclined and gradually contracted from its periphery toward its center and connected to the rod 32, a plurality of cutting teeth 313 arranged along the outer periphery of the top surface 311 and connected in sequence, a plurality of receiving portions 314 recessed on the cone 312, and a plurality of convex ribs 315 arranged at intervals, and each convex rib The ribs 315 are located between any two adjacent receiving portions 314. The receiving portions 314 and the ribs 315 are located between the cutting teeth 313 and the rod 32. In this embodiment, the cone 312 defines a plurality of reference lines R, and the reference lines R extend radially outward from the center of the cone 312, and the ribs 315 extend along the reference lines R. 4, that is, each rib 315 extends from the vicinity of the cutting tooth 313 along the corresponding reference line R toward the rod 32, and each accommodating portion 314 gradually expands from the direction of the rod 32 toward the direction of the cutting teeth 313, so that each rib 315 gradually decreases from the direction of the rod 32 toward the direction of the cutting tooth 313.

Referring to FIG. 3 , each of the cutting teeth 313 has a first wall surface 3131, a second wall surface 3132 connected to the first wall surface 3131, and a third cutting edge 3133 formed at the junction of the first wall surface 3131 and the second wall surface 3132. A first cutting edge 3131A is formed on the first wall surface 3131, and a second cutting edge 3132A connected to the first cutting edge 3131A is formed on the second wall surface 3132. Both ends of the second cutting edge 3132A of each cutting tooth 313 are respectively connected to two adjacent first walls 3131, so that the cutting teeth 313 are in a step-like shape and are connected in sequence, so that when the screw 3 is screwed, the third cutting edge 3133 can be screwed by the third cutting edge 3133. The first cutting blade 3131A and the third cutting blades 3133 cut fibers. In addition, each accommodating portion 314 has a groove 3141 and an auxiliary groove 3142 arranged around the circumference of the groove 3141, and each convex rib 315 is located between any two adjacent auxiliary grooves 3142. At the same time, each convex rib 315 is also located between any two adjacent grooves 3141, and the area of the auxiliary grooves 3142 is smaller than the area of the grooves 3141. In addition, the number of the cutting teeth 313 is twice the number of the accommodating portions 314, so that the grooves 3141 are connected to some of the cutting teeth 313, and the auxiliary grooves 3142 are connected to the remaining cutting teeth 313.

Referring to Figures 3, 4 and 5, when the screw 3 is locked, the tail 33 is first pressed against the surface 42 of an object 4, and then the tail 33 and the threads 34 are screwed downward. Cut the object 4 so that the object 4 is rotated to create a locking hole 41. When the tail 33 and the threads 34 are rotated downward, the rod 32 is gradually buried into the locking hole of the object 4. 41, the chips and uncut fibers generated during the rotary cutting process will move outward along the threads 34, so that the chips and fibers are accumulated around the locking hole 41. At this time, by The first cutting edge 3131A, the second cutting edge 3132A and the third cutting edge 3133 of the cutting teeth 313 effectively destroy the fibers that are not cut off by the screw teeth 34 and scrape off the burrs formed around the periphery of the locking hole 41 , so as to prevent the fibers from being entangled in the head 31, thereby reducing the locking resistance and increasing the locking speed. Furthermore, the protruding ribs 315 can not only assist in rotary cutting, but also push the chips into the In the receiving portion 314 , each receiving portion 314 is formed by the auxiliary groove 3142 surrounding the groove 3141 , so that the auxiliary groove 3142 can be connected between the protruding ribs 315 and the groove 3141 , so that the chips can be pushed through the convex ribs 315 and quickly and smoothly enter the groove 3141 from the auxiliary groove 3142. At the same time, the grooves 3141 provide enough space for the chips, so that the screw 3 can It closely fits the object 4 without excess chips or fibers accumulating on the periphery of the head 31 . It also increases the flatness of the screw 3 after being locked and prevents the object 4 from expanding and cracking.

Referring to Figure 6, the second preferred embodiment of the present invention still includes the components described in the first embodiment, and its purpose and effect are the same as those of the first embodiment. They will not be described again here. For example, the protruding ribs 315 extend from the cutting teeth 313 toward the rod body 32 and are arranged at an inclination with the reference lines R, and the protruding ribs 315 can be designed with different inclination directions according to actual use requirements. Therefore, during the locking process of the screw 3, the fibers can be pushed and rotated through the ribs 315, and the generated chips can be guided into the receiving portions 314 to avoid excessive chips or fibers. Accumulated on the periphery of the head 31, thereby reducing the locking resistance and improving the flatness of the screw 3 after locking.

To summarize the foregoing, the screw of the present invention is provided with accommodating portions and protruding ribs arranged staggered in sequence on the cone, and the outer periphery of the top surface is provided with the cutting teeth, so that the object can be cut through the cutting teeth. fibers, and at the same time remove the burrs around the locking hole of the object to prevent the head from being entangled by the fibers and causing increased locking resistance. At the same time, the ribs can not only assist in peeling the fibers, but also Guide the generated chips into the receiving part, and the receiving part has enough space to accommodate the chips, so as to achieve a tight combination of the screw and the object, and prevent excess chips or fibers from accumulating around the head. It is beneficial to reduce the generation of locking resistance, and at the same time, the screw can be locked into the object smoothly.

However, the above is only to illustrate the preferred embodiment of the present invention, and should not be used to limit the scope of implementation of the present invention. In other words, all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the invention specification should still fall within the scope of the patent of the present invention.

(customary knowledge) 1:Screw 11:Head 12: Rod body 13:Tail 14: screw thread 111:Top surface 112:Cone 2:Object 21: Locking hole 22:Surface (this invention) 3:Screws 31:Head 32: Rod body 33:Tail 34: screw thread 311:Top surface 312:Cone 313: Teeth cutting 314: Accommodation Department 315:Protruding ribs 3131:First wall 3131A: First cutting edge 3132:Second wall 3132A: Second cutting edge 3133:Third cutting edge 3141: Groove 3142: Auxiliary slot 4:Object 41: Locking hole 42:Surface

Figure 1 is a schematic diagram of a known screw. Figure 2 is a schematic diagram of a known screw in use. Figure 3 is a three-dimensional diagram of the first preferred embodiment of the present invention. Figure 4 is a cross-sectional view of line A-A of Figure 3. Figure 5 is a schematic diagram of the first preferred embodiment in use. Figure 6 is a top view of the second preferred embodiment.

3: Screws

31: Head

32: Rod body

33:Tail

34: Screw thread

311: Top

312: Cone

313: Teeth cutting

314: Accommodation Department

315: ribs

3131:First wall

3131A: First cutting edge

3132:Second wall

3132A: Second cutting edge

3133: The third cutting edge

3141: Groove

3142: Auxiliary slot

Claims (6)

A screw includes a head, a rod extending outward from the head, a tail disposed on the rod and opposite to the head, and a plurality of screw threads spirally disposed on the rod, wherein the head has a top surface and a cone opposite to the top surface and connected to the rod; the characteristics are: The head also has a plurality of cutting teeth disposed along the outer periphery of the top surface and connected in sequence, a plurality of receiving portions recessed on the cone, and convex ribs formed between any two adjacent receiving portions, and the receiving portions and the convex ribs are located between the cutting teeth and the rod, wherein each cutting tooth has a first wall surface, a second wall surface connected to the first wall surface, and a convex rib disposed along the connection between the first wall surface and the second wall surface. The third cutting edge is formed on the first wall surface, and a second cutting edge connected to the first cutting edge is formed on the second wall surface, and each second cutting edge is connected between any two adjacent first walls. In addition, each accommodating portion has a groove and an auxiliary groove arranged along the outer periphery of the groove, and the groove extends from the cone toward the rod body, and each rib is located between any two adjacent auxiliary grooves. A screw according to claim 1, wherein the area of the auxiliary grooves is smaller than the area of the recessed grooves. A screw according to claim 1, wherein the number of the cutting teeth is twice the number of the accommodating portions. The screw according to claim 3, wherein the grooves are connected to some of the incisors, and the auxiliary grooves are connected to the remaining incisors. According to the screw described in claim 1, the cone defines a plurality of baselines, and the baselines extend radially outward from the center of the cone, and the ribs are extended along the baselines. The screw according to claim 1, wherein the cone defines a plurality of reference lines, and the reference lines extend radially outward from the center of the cone, and the ribs extend from the incisors toward the rod body , and set up at an angle to the baselines.

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