TWM582082U - Cracking-proof wood screw - Google Patents

Abstract

A crack-proof wood screw comprising a screw head, a rod body extending integrally from the screw head, a screw thread provided on the rod body, and a spiral spirally disposed on the rod body and the screw thread Grooving. The spiral grooving is continuously spirally extended on the rod body by a predetermined length. The spiral grooving section has a trapezoidal shape with a long bottom facing outward, which can accommodate and discharge wood chips when locked, effectively saving labor and preventing wood cracking. . When the spiral cracker of the present invention is manufactured, when the spiral cut groove having a trapezoidal cross section is manufactured by the tooth decay, since the spiral cut groove has an angular shape, it can be surely engaged with the dental plate without displacement, so the spiral cut The groove is excellent in molding state, and can be molded in one process with the screw, which saves processing cost and improves manufacturing quality.

Description

Crackproof wood screw

The present invention relates to a screw, and more particularly to a crack-proof wood screw.

Referring to FIG. 1 , a conventional screw 1 includes a rod body 11 having a sharp end, a thread 12 of a spiral ring disposed on the rod body 11 , and a recessed axially from the end of the rod body 11 . a chip flute 13 at a distance. The chip flute 13 is for accommodating the generated wood chips when the screw 1 is locked. Referring to Figure 2, the conventional screw 1 may also include more than two chip flutes 13 in order to accommodate more wood chips. As shown in FIG. 3, another conventional screw 2 includes a rod body 21 having a quadrangular pyramid shape at the end, and a spiral ring 22 is provided on the thread 22 of the rod body 21. The thread 22 has a plurality of corrugated grooves 221 recessed from the end, so that the thread 22 near the end of the rod 21 can have better cutting ability, resulting in a smoother function when locked.

However, the screws 1 and 2 shown in FIGS. 1 to 3 are gradually increased in frictional force between the threads 12, 22 and the rods 11, 21 and the wood block without being drilled into the pre-drilled hole and locked into the wooden block. Therefore, more and more force is required to be smoothly locked, and since the chip flute 13 extends only a distance from the tip end of the rod body 11, when the amount of wood chips is gradually increased, it is still possible to squeeze. The case of wood cracks caused by wood blocks. Therefore, in order to solve this problem, it is necessary to make the wood chips generated at the time of locking have more accommodation space, or to eliminate the wood chips immediately.

Referring to FIG. 4, a self-tapping screw 3 disclosed in the new patent No. M460950 of the Republic of China includes a rod body 31 having a sharp end, a thread 32 of a spiral ring disposed on the rod body 31, and a concave surface. a chip pocket 33 provided on the rod body 31. The thread 32 includes a plurality of threaded portions 321 spaced apart from each other, and the chip pockets 33 include a plurality of recessed segments 331 respectively located between each of the two threaded portions 321 . Since the chip flutes 33 are divided into the plurality of recessed sections 331 by the screw portions 321, the space for accommodating the wood chips can be increased, and the formed wood chips cannot be effectively eliminated.

Referring to FIG. 5, a screw 4 of a spiral cutting groove 43 disclosed in the Japanese Patent Publication No. 201013060 includes a rod 41 having a sharp end, a thread 42 formed on the rod 41, and A spiral recessed groove 43 is provided on the rod body 41 and the thread 42. Among them, the spiral cutting groove 43 can remove wood chips when the screw 4 is locked. However, in the case of a round bar-shaped metal substrate, since the meshing condition of the spiral cutting groove 43 having a circular arc shape and the tooth plate is not good, the displacement of the spiral cutting groove 43 is likely to occur, and the The molding condition of the thread 42 is not good.

Therefore, the object of the present invention is to provide a crack-proof wood screw which is capable of preventing wood chips during locking and preventing wood cracking, and which has good molding quality at the time of manufacture.

Therefore, the novel crack-proof wood screw comprises a screw head, a rod body extending integrally from the screw head along an axis and having a sharp end, a screw ring provided on the rod body, and a spiral recess On the rod body and the thread, and from a position spaced apart from the end of the rod body, a spiral slit of a predetermined length is continuously spirally extended toward the screw head. Wherein, the spiral slit has a trapezoidal cross section, and the trapezoid has a short bottom and a long bottom, and the long bottom is outward.

The utility model has the following advantages: the spiral grooving is a continuous spiral extension, and in addition to being able to accommodate the generated wood chips during the locking of the crack-proof wood screw, and the wood chips can be discharged, the crack-proof wood screw can be easily Locked into the wood and the force is consistent, the screwing torque is greatly reduced during the locking process, and the total torque can be accumulated smoothly, slowly and in a low range, which obviously produces labor-saving effects and can effectively prevent the cracking of the wood. In addition, the bottom of the screw is not reamed in the wood when it is locked, so the pull-out force is not reduced, the wood can maintain the existing safety structural force, in addition to improving the construction efficiency, it can also improve the structural safety and solve the global current The same industry is at a high rate of labor, to prevent cracking, and to safely pull out the problem to be solved. When the novel anti-cracking wood screw is manufactured, since the spiral grooving section has a trapezoidal shape, it has an angular engagement force and an excellent meshing force with the dental plate, so that displacement between the two is difficult, and the spiral grooving is optimized. The molding condition of the screw. The screw thread and the spiral slit can be formed once by the tooth plate, and the spiral groove does not need to be subjected to secondary processing, thereby effectively saving processing cost.

Referring to FIG. 6 , an embodiment of the present invention is provided with a screw head 51 , a rod body 52 extending integrally from the screw head 51 along an axis L and having a sharp end 521 . The thread 53 of the rod body 52 and a spiral recess are disposed on the rod body 52 and the thread 53 and are spaced apart from the end 521 of the rod body 52 to face the screw head 51. A continuous spiral extends a predetermined length of helical cut 54. The predetermined length of the spiral cut 54 extends at least half of the screw 53 , and the lead angle α2 of the spiral cut 54 is greater than the lead angle α1 of the screw 53 .

Referring to FIG. 6 and FIG. 7 , the spiral slit 54 has a trapezoidal cross section. The trapezoid has a short bottom and a long bottom. The long bottom is facing outward, and the spiral slit 54 is a continuous spiral extension. A cutting edge 541 is formed at each of the two sides of the spiral groove 54 and the rod body 52. Wherein, the cutting edge 541 is matched with the spiral extending state of the screw 53 to additionally generate a concentrated cutting force with respect to the discontinuity of the contact area, thereby optimizing the locking performance. As shown in FIG. 8, in the case where the wood 7 is locked by the cutting effect of the screw 53 and the cutting edges 541, the embodiment can be locked in the crack-proof wood screw 5. The generated wood chips 71 are accommodated in the process, and the wood chips 71 can be discharged, so that the crack-proof wood screws 5 can be easily locked into the wood 7 and the force is consistent, and the screwing torque is greatly reduced during the locking process, and can be smoothly, The total torque is accumulated slowly and in a low range, which obviously produces a labor-saving effect and can effectively prevent the cracking of the wood. In addition, the bottom of the screw 53 is not reamed in the wood 7 when locked, so the pulling force is not reduced, and the wood 7 can retain the existing safety structural force, in addition to improving the construction efficiency, the structure safety can be improved and solved. The problem that the same industry in the world is currently working on a high proportion of labor, preventing cracking, and safe pull-out.

Referring to Figure 9 and in conjunction with Figure 6, the method of making the novel split-proof screw includes a forming step 91 and a cavities step 92. The molding step 91 is to cut a metal substrate in the shape of a round rod to form a rod body 52 of a predetermined length, and a screw head 51 is formed by stamping at one end of the rod body 52, and the cavities step 92 is A spirally extending thread 53 is continuously formed on the rod body 52 by using a tooth plate, and a spiral recess is provided on the rod body 52 and the thread 53 and spaced apart from the end 521 of the rod body 52. From the position of the distance, a spiral slit 54 of a predetermined length is continuously spirally extended in the direction of the screw head 51, and the spiral slit 54 has a trapezoidal shape with a long base facing outward. It should be particularly noted that since the cross section of the spiral slit 54 is substantially trapezoidal, the moving speed of the tooth plate during the tooth decay can be performed by the angular shape of the trapezoid and the relatively slow moving speed of the tooth plate. Compared with the conventional operations, the deceleration is 25% to 35%, in order to allow the dental plate to positively engage the metal substrate and the dental plate while molding the screw 53 and the spiral groove 54. No displacement is generated between each other, and a shape of a complete shape is formed, thereby optimizing the cutting ability of the screw 53, and the tooth plate can increase the number of rolling turns relative to the rod 52 by 40% to 60 during the manufacturing. The lengthening type of the tooth plate, in conjunction with the relatively slow moving speed of the tooth plate, ensures that the cross-sectional shape of the spiral groove 54 from the head to the tail can exhibit the desired ladder shape.

In addition, the screw 53 and the spiral slit 54 can be formed at one time via a dental plate, and the spiral slit 54 does not need to be subjected to secondary processing, thereby effectively saving processing costs.

In summary, when the wood splitting screw 5 of the present invention locks the wood 7, the wood chip 71 can be accommodated and discharged by the spiral slit 54 to save labor and prevent cracking, thereby manufacturing the defense. When the wood screw 5 is cracked, the spiral groove 54 having a trapezoidal cross section can be surely meshed with the used tooth plate by the angular shape of the trapezoid and transmitted through the short bottom of the spiral groove 54 to avoid two The displacement is generated, and the molding quality of the crack-proof wood screw 5 is effectively optimized, so that the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and when it is not possible to limit the scope of the present invention, all the simple equivalent changes and modifications according to the scope of the patent application and the contents of the patent specification are still This new patent covers the scope.

1‧‧‧ screws  11‧‧‧ rod body  12‧‧‧ thread  13‧‧‧ chip flute  2‧‧‧ screws  21‧‧‧ rod body  22‧‧‧ thread  221‧‧‧ Waveform slot  3‧‧‧ Self-tapping screws  31‧‧‧ rod body  32‧‧‧ thread  321‧‧‧ threaded parts  33‧‧‧ chip flute  331‧‧‧ Depression  4‧‧‧screws with helical cutting grooves  41‧‧‧ rod body  42‧‧‧Thread  43‧‧‧Spiral cutting groove  5‧‧‧ crack-proof wood screws  51‧‧‧ screw head  52‧‧‧ rod body  End of 521‧‧‧  53‧‧‧ thread  54‧‧‧Spiral grooving  541‧‧‧ cutting edge  7‧‧‧ timber  71‧‧‧Sawdust  91‧‧‧Molding steps  92‧‧‧ tooth decay steps  11‧‧‧ lead angle  22‧‧‧ lead angle  L‧‧‧ axis  

Other features and effects of the present invention will be apparent from the following description of the drawings, in which:  Figure 1 and Figure 2 are partial front elevational views showing a conventional screw;  Figure 3 is a perspective view showing another conventional screw;  Figure 4 is a perspective view showing a self-tapping screw disclosed in the new patent No. M460950 of the Republic of China;  Figure 5 is a perspective view showing a screw of a spiral cutting groove disclosed in Japanese Patent Publication No. 201013060;  Figure 6 is a front elevational view showing an embodiment of the novel crack-proof wood screw;  Figure 7 is a cross-sectional view, and Figure 6 illustrates a spiral cut slot of the embodiment;  Figure 8 is a schematic view showing the state in which the embodiment is used;  Figure 9 is a block flow diagram illustrating a method of making the novel split-proof wood screws.  

Claims (4)

A crack-proof wood screw comprising:  a screw head  a rod body integrally extending from the screw head along an axis and having a sharp end;  a threaded, spiral ring disposed on the rod; and  a spiral groove, the spiral concavely disposed on the rod body and the thread, and continuously spirally extending a predetermined length toward the screw head from a position spaced apart from the end of the rod body, the spiral cut The groove has a trapezoidal cross section, and the trapezoid has a short bottom and a long bottom, and the long bottom is facing outward.   The crack-proof wood screw of claim 1, wherein the predetermined length of the spiral slit extends is at least half of the thread. The crack-proof wood screw of claim 1, wherein a lead angle of the spiral cut is greater than a lead angle of the thread. The crack-proof wood screw of claim 1, wherein the joint between the two sides of the spiral cut groove and the rod body respectively form a cutting edge.