JP3107272U - Wood screw - Google Patents

Abstract

Provided is a wood screw that shortens the time required for a wood screw to stand on its own.
A shaft portion having both upper and lower ends and at least one screw thread for screwing 30 formed on the outer peripheral surface thereof, and a head portion formed at the upper end of the shaft portion. And the tip of the shaft portion is formed sharply at the lower end portion of the shaft portion, and the drill blade 51 is continuously formed one by one on the outer peripheral surface of the at least one thread. In the wood screw comprising the tapered portion 5 formed, a wood screw is provided in which the lead angle of the drill blade is formed larger than the lead angle of the screw thread.
[Selection] Figure 7

Description

  The present invention relates to a wood screw used for a wood or wood-based member.

  As shown in FIGS. 1 and 2, the conventional wood screw 1 has a shaft portion 11 having upper and lower ends and a screw thread 110 for screwing formed on the outer peripheral surface thereof in a spiral shape, and the shaft portion 11. The head portion 12 is formed at the upper end of the shaft portion 11 and the taper portion 13 is formed sharply at the lower end portion of the shaft portion 11 so that the tip thereof becomes the tip of the entire shaft portion.

  As shown in FIG. 3, when the wood screw 1 is screwed into the wood 2, the taper portion 13 opens a hole in the wood 2 and then bites into the wood 2, so that the screw thread 110 of the shaft portion 11 The shaft 11 is advanced into the wood 2 by expanding the pilot hole.

  However, in order to open a pilot hole in the wood 2, it is possible to open a pilot hole having a shallow depth only by first strongly pushing the tip of the taper portion 13 to a predetermined lower drilling position of the wood 2. Therefore, it takes a long time to push the wood screw 1 until it becomes self-supporting. During this time, if the center of gravity of the force applied to the tapered portion 13 is slightly deviated, the wood screw 1 is easily detached from the pilot hole. Further, when the lower hole is continuously expanded by the screw thread 110 of the shaft portion 11, as the approach of the shaft portion 11 becomes deeper, the clogging of chips accumulated in the back of the hole becomes bulky and the screwing resistance increases. Therefore, there is a disadvantage that the power required for the work increases.

  In view of the above, a first object of the present invention is to provide a wood screw that shortens the time until the wood screw is self-supporting.

  A second object of the present invention is to provide a wood screw that can reduce screwing resistance.

  In order to achieve the first object, the present invention provides a shaft portion having upper and lower ends, and at least one screw thread for screwing formed on the outer peripheral surface thereof, and the shaft portion. A head formed at the upper end of the shaft, and a tip sharply formed at the lower end of the shaft, and the tip thereof becomes the tip of the entire shaft, and a drill blade is provided on the outer circumferential surface of the at least one thread. A wood screw comprising a taper portion continuously formed one by one, wherein the lead angle of the drill blade is formed larger than the lead angle of the screw thread. More specifically, the lead angle refers to a depression angle with respect to the working surface of the screw thread or the drill blade, and the at least one thread may include one thread for screwing, or two or There may be multiple items such as three items. When there is one thread, the drill blade also has one thread. When there are two threads, the drill blade also has two threads, and each thread is continuous with the drill blade.

  In order to achieve the second object, the present invention has two upper and lower drill surfaces in which the drill blade is inclined and cross-concentrates near the tip of the tapered portion and sandwiches a predetermined angle. The lead angle of the upper drill surface is in the range of 75 ° to 90 °, and the lead angle of the lower drill surface is in the range of 30 ° to 60 °. In other words, the drill blade gradually becomes thinner from the root end connected to the screw thread to the tip, and becomes sharper.

  According to the above configuration, the wood screw of the present invention is formed such that the lead angle of the drill blade is larger than the lead angle of the thread, so that when the wood screw is turned, the cutting action of the drill blade causes the wood or wood-based member For example, it is possible to make a pilot hole with a large depth. For this reason, it is possible to significantly reduce the time required for the wood screw to stand on its own.

  In addition, since the tip of the drill blade of the present invention has a sharp tip, when the pilot hole is expanded, resistance to the drill blade due to chips clogged in the wood and in the hole is reduced. The power required for screwing can be reduced.

  Further, the wood screw of the present invention may be a single thread or a multi-thread, but the larger the number of threads, the longer the approach distance per rotation, so that the screwing time can be further shortened.

Hereinafter, a preferred embodiment of the wood screw of the present invention will be described with reference to FIGS.
As shown in FIGS. 4 and 5, the wood screw in the present embodiment includes a shaft portion 3, a head portion 4, and a tapered portion 5.

The shaft portion 3 has upper and lower ends, and two screw threads 30 for screwing are formed on the outer peripheral surface of the shaft portion 3 in a spiral shape.
The head 4 was formed at the upper end of the shaft 3. And the groove | channel 41 fitted with the tool which turns a wood screw in the said head 4 was formed. In the present embodiment, the groove 41 has a square shape, but may be formed in a cross shape or a single shape.
The tapered portion 5 is formed sharply at the lower end portion of the shaft portion 3, and the tip thereof becomes the tip of the entire shaft portion 3. Then, on the outer peripheral surface of the taper portion 5, two drill blades 51 respectively continuous with the two thread threads 30 were formed. The lead angle α of each drill blade 51 was formed larger than the lead angle β of the thread 30 (see FIG. 7).

  Further, in the present embodiment, each of the drill blades 51 is formed symmetrically with an interval of 180 ° in the circumferential direction, and gradually from the root end connected to the two threads 30 to the tip. It has become thinner. More specifically, each of the drill blades 51 has two upper and lower drill surfaces 511 and 512 that are inclined and intersect with each other near the tip of the taper portion 5 and sandwich a predetermined angle θ. As shown in FIG. 4, in this embodiment, the lead angle α1 of the upper drill surface 511 is 90 °, and the lead angle α2 of the lower drill surface 512 is 60 °. That is, the predetermined angle θ sandwiched between the upper and lower drill surfaces 511 and 512 is an acute angle of 30 °. Of course, if the lead angle of the upper drill surface 511 is in the range of 75 ° to 90 ° and the lead angle of the lower drill surface 512 is in the range of 30 ° to 60 °, the root connected to the thread 30 is provided. Needless to say, the taper is gradually narrowed from the end to the tip.

  As shown in FIG. 7, when the wood screw of the present embodiment is screwed into the wood 6, the drill hole 51 is cut by the drill blade 51 of the taper portion 5 to a predetermined bottom drilling position of the wood 6. As the wood 6 digs into the depth, the lower hole is pushed and widened by the screw thread 30 of the shaft portion 3 so that the shaft portion 3 enters the wood 6. Since the tip of the drill blade 51 has an acute angle while the lower hole is expanded by the screw thread 30 of the shaft portion 3, the drill blade 51 of the clogged chips accumulated in the wood 6 and in the hole. Since the resistance given to is reduced, the power required for screwing can be reduced.

  As described above, the wood screw of the present invention can drill a pilot hole with a large depth by the cutting action of the drill blade, thereby reducing the time until the wood screw is self-supporting and reducing the screw displacement problem. In addition, since the tip of the drill blade is sharp, the resistance given to the drill blade due to chips clogged in the wood and in the hole is reduced, and the power required for screwing can be reduced. it can. As a result, the accuracy and efficiency of screwing can be greatly improved.

Perspective view showing a conventional wood screw 1 is a cross-sectional view of the wood screw of FIG. Side view when screwing the wood screw of Fig. 1 into wood The perspective view which shows the wood screw of embodiment of this invention 4 is a cross-sectional view of the wood screw of FIG. The figure seen from the front-end | tip of the taper part of the wood screw of this embodiment Side view when screwing the wood screw of the embodiment into wood

Explanation of symbols

3 Shaft 30 Thread 4 Head 41 Groove 5 Taper 51 Drill blade 511 Upper drill surface 512 Lower drill surface α Drill blade lead angle α1 Upper drill surface lead angle α2 Lower drill surface lead angle β Thread lead Angle θ Angle between upper and lower drill surfaces

Claims (5)

A shaft portion having upper and lower ends, and a screw thread for screwing one thread on the outer peripheral surface thereof, a head portion formed at the upper end of the shaft portion, and a lower end portion of the shaft portion In the wood screw which is formed sharply and the tip thereof becomes the tip of the entire shaft portion, and the outer peripheral surface thereof is formed with a taper portion in which one drill blade continuous with the thread is formed.
A wood screw characterized in that a lead angle of the drill blade is formed larger than a lead angle of the screw thread. A shaft portion having upper and lower ends and a plurality of screw threads for screwing formed on the outer peripheral surface thereof, a head portion formed at the upper end of the shaft portion, and a lower end portion of the shaft portion The tip of the shaft portion is the tip of the entire shaft portion, and the outer peripheral surface of the taper portion is formed with a plurality of drill blades that are continuous with the multiple threads. In wood screws,
A wood screw characterized in that a lead angle of each drill blade is formed larger than a lead angle of the screw thread. The drill blade has two upper and lower drill surfaces which are inclined and sandwiched at a predetermined angle while being inclined and in the vicinity of the tip of the tapered portion.
The lead angle of the upper drill surface is in the range of 75 ° to 90 °,
The wood screw according to claim 1 or 2, wherein a lead angle of the lower drill surface is in a range of 30 ° to 60 °. Each of the thread and the drill blade has two threads,
The two drill blades are formed symmetrically with an interval of 180 ° in the circumferential direction, and gradually narrow from the root end connected to the two thread threads to the tip. The wood screw according to claim 2.   The wood screw according to any one of claims 1 to 3, wherein a groove that fits with a tool for turning the wood screw is formed in the head.

Images