TW201422931A - Wood screw - Google Patents

Abstract

A wood screw provides a plurality of auxiliary cutting areas disposed on a bottom surface of a head and a flat area formed in any two adjacent auxiliary cutting areas. Each auxiliary cutting area includes at least two cutting grooves disposed at intervals and formed at the bottom surface, and a cutting edge formed at a convergence of the cutting grooves. When the bottom surface contacts the surface of the wood, the cutting edge cuts and scrapes off burrs generated around the drilling hole, and the scraped burrs are accommodated in the cutting grooves to prevent the burrs from exposing to the head after screwing. Further, the head is tightly screwed on the wood to enhance the screwing stabilization.

Description

Wood screw

The invention relates to a screw design, in particular to a wood screw for locking on wood.

Referring to FIG. 1 and FIG. 2, the conventional wood screw 1 includes a screw head 11, a rod body 12 extending outward from the screw head 11, and a locking portion 13 disposed at the other end of the rod body 12; The rod body 12 is provided with a plurality of threaded teeth 121. The screw head 11 has a top surface 111, a bottom surface 112 opposite to the top surface 111 and having a tapered shape, and a plurality of upper surfaces 112 are respectively spaced apart from the bottom surface 112. The upper rib 113; when referring to FIG. 3, when the wood screw 1 is used for locking on the wooden board 2, after the locking portion 13 is used to abut the wooden board 2, and a rotating force is applied, it is preliminary A hole 21 is drilled in the wooden board 2, and the rod 12 is continuously driven into the hole 21 through the screw 121 until the screw 11 touches the board 2, and the ribs 113 are scraped off. The burrs around the bore 21 allow the screw head 11 to fit snugly against the plank 2, thereby completing the locking of the planks 2.

However, after actual use, it has been found that the wood screw 1 has the following defects, as detailed below:

1. Since the wooden board is composed of elastic wood fiber material and the ribs are spaced apart, when the ribs are to be broken, the ribs are often arranged at intervals. In addition, the influence of the elastic force of the wood fiber makes the ribs unable to effectively scrape and break the burrs around the borehole 21, causing the screw head to protrude due to the burrs and cannot be flattened to the borehole. On 21, the lock effect is not good.

2. Continuing the foregoing, and at the same time partially smashed by the rib 113, the screw head 11 also does not provide a chip space for the burr to be received, so that a part of the burr protrudes outside the screw head 11 after the locking, It also causes poor locking effect and needs to be improved.

Therefore, the object of the present invention is to provide a wood screw which can effectively scrape the burrs around the drill hole and at the same time provide sufficient clearance for the burrs to be stored after the scraping, so as to prevent the burrs from protruding from the screw head after the locking In addition, the screw can be closely attached to the surface of the wooden board to achieve a better locking effect.

Therefore, the wood screw of the present invention comprises a screw head, a rod body extending outward from the screw head, and a locking portion disposed at the other end of the rod body; wherein the screw head has a top surface, The top surface is disposed and has a tapered bottom surface, and the bottom surface is provided with a plurality of auxiliary cutting regions, and any two adjacent auxiliary cutting sections are formed with a planar area, and each of the auxiliary cutting areas has at least two Grooves are formed at intervals on the bottom surface, and all the cutting edges are formed at the joints of the connecting grooves; so that the wood screws are drilled by the cutting edge and the groove design of the auxiliary cutting zone The burrs generated around the drilled hole will be effectively excluded from the scraping of the cutting edges, and the burrs will be accommodated in the grooving after scraping, so that there will be no burrs after the locking. Extending beyond the screw head, the screw head can be closely attached to the surface of the wood surface of the workpiece, thereby enhancing the locking effect.

The above and other technical contents, features, and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

Before the present invention is described in detail, it is noted that in the following description, like elements are denoted by the same reference numerals.

Referring to FIG. 4, in the first preferred embodiment of the present invention, the wood screw 3 includes a screw head 31, a rod body 32 extending outward from the screw head 31, and a locking portion disposed at the other end of the rod body 32. 33; wherein the rod body 32 is provided with a plurality of threaded teeth 321 on the ring, and the screw teeth 321 are arranged around a certain spiral angle; further, the screw head 31 has a top surface 311, and a top surface 311 a bottom surface 312 extending downwardly and having a tapered shape. Referring to FIG. 5, the bottom surface 312 is provided with a plurality of auxiliary cutting regions 34, and a planar region 35 is formed between the adjacent auxiliary cutting regions 34. Each of the auxiliary cutting zones 34 has at least two slits 341 which are disposed at intervals and are formed on the bottom surface 312, and the connecting edges 341 are formed with all the edges 342. In the embodiment, the bottom surface 312 is formed. The auxiliary cutting zone 34 is provided with three cutting edges 342 and two slits 341 as an example. As for the locking portion 33 in this embodiment, It is represented by a pointed cone.

Referring to FIG. 6, when the wood screw 3 is locked to a wooden board 4, the locking portion 33 is firstly engaged with the wooden board 4, and a top surface of the screw head 31 is applied with a rotational force. The locking portion 33 and the thread 321 cut the wooden board 4, and a hole 41 is cut in the wooden board 4, and the periphery of the drilling hole 41 will be burred due to the cutting of the locking portion 33 and the thread 321 ,and After that, the thread 321 will continue to drive the rod 32 into the wooden board 4 along the hole 41 until the screw head 31 approaches the hole 41, because each of the auxiliary cutting areas 34 is plural The cutting edge 342 and the slit 341 are formed, and at the same time, because the cutting edge 342 is connected to the slit 341 and then connected to the design of the other cutting edge 342, the burr can be pulled by the two cutting edges 342 and then broken. Eliminating the factor that the burr is difficult to break due to the elasticity of the wood fiber, so as to achieve the scraping action on the burrs around the bore 41, and the burrs scraped off by the cutting edges 342 can also be stored in the burrs The inside of the groove 341 is closed, so that no burrs protrude from the screw head 31 after the locking, so that the screw head 31 can not be affected by the burrs around the hole 41, so that the screw head 31 can be more closely attached. Flat on the surface of the wooden board 4, effectively enhancing the locking effect of the wood screw 3 and the wooden board 4.

Referring to FIG. 7, a second preferred embodiment of the present invention further includes a screw 31, a rod 32, a locking portion 33, and the like, and the foregoing components and effects are the same as those of the first embodiment. For example, in the present embodiment, an edentulous region 36 is disposed on the rod body 31 between the thread 321 and the screw head 31, and at the same time, a gap between the edentulous region 36 and the thread 321 is further provided. a reaming area 37, and the above-mentioned reaming area 37 is formed with a plurality of spaced threads 371, and the spiral angle of the threads 371 and the center of the rod is 371 α at the spiral angle of the thread 321 and the center of the rod 321 α; that is, when the wood screw 3 is used for fixing the fixing of the two wooden boards (not shown), the threads 371 can scrape the inner wall of the drilled hole of the wooden board to reduce the subsequent body. In addition to the resistance of the lock, the setting of the edentulous zone 36 is used to make the two boards more tightly joined, thereby lifting the wood screw 3 The locking force.

In summary, the wood screws of the present invention are designed by the auxiliary cutting zones and ribs so that the burrs generated around the drilled holes of the wood board are excluded from the burrs of the ribs, and the burrs are scraped off at the same time. It can also be stored in the gap of any two auxiliary cutting sections, so that the screw head can be closely attached to the surface of the wooden board, thereby enhancing the locking effect, so that the purpose of the invention can be achieved, and the application is made according to law.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the description of the invention. All should remain within the scope of the invention patent.

3‧‧‧ wood screws

31‧‧‧ screw head

311‧‧‧ top surface

312‧‧‧ bottom

32‧‧‧ rod body

321‧‧‧ thread

321 α‧‧‧ thread angle

33‧‧‧Locking Department

34‧‧‧Auxiliary cutting zone

341‧‧‧ slotting

342‧‧‧ cutting edge

35‧‧‧ flat area

36‧‧‧Without the tooth

37‧‧‧Reaming area

371‧‧‧ thread

371 α‧‧‧ thread angle

1 is a schematic view of a conventional wood screw; FIG. 2 is a sectional view of the conventional wood screw; FIG. 3 is a perspective view of a first preferred embodiment of the present invention; 5 is a sectional view of FIG. 4B-B; FIG. 6 is a lock state diagram of the first preferred embodiment of the present invention; and FIG. 7 is a perspective view of a second preferred embodiment of the present invention.

3‧‧‧ wood screws

31‧‧‧ screw head

311‧‧‧ top surface

312‧‧‧ bottom

32‧‧‧ rod body

321‧‧‧ thread

33‧‧‧Locking Department

34‧‧‧Auxiliary cutting zone

341‧‧‧ slotting

342‧‧‧ cutting edge

35‧‧‧ flat area

Claims (3)

a wood screw comprising a screw head, a rod body extending outwardly from the screw head, and a locking portion disposed at the other end of the rod body; wherein the screw head has a top surface, and a a top surface extending downwardly and having a tapered shape; and the rod body is provided with a plurality of threaded teeth, and the thread is arranged around a certain spiral angle, wherein the bottom surface is provided with a plurality of auxiliary cutting regions And at least two adjacent auxiliary cutting sections are formed with a planar area, wherein each of the auxiliary cutting areas has at least two slits formed at intervals and formed on the bottom surface, and the connected joints are connected Formed with all the blades. According to the wood screw of the first aspect of the patent application, an edentulous area is disposed on the rod body between the thread and the screw head. According to the wood screw of claim 2, the rod body is provided with a reaming area on the thread and the toothless section, and the plurality of threads are formed on the reaming area, and the plurality of threads are arranged at intervals The helix angle of the thread with the center of the rod is greater than the helix angle of the thread with the center of the rod.