JPH1037928A - Screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct screwing in wooden or other material rapidly with small effort, and prevent a threaded rod from being broken or the material from being torn easily. SOLUTION: Two recessed parts 5, 6 are formed at the outer periphery of a threaded rod 2 respectively. When the two recessed parts 5, 6 approach nearest a vertical projector on the center line of a screw, the higher screwing-in speed is, the smaller encountered resistance force becomes. During screwing-in operation, the recessed parts 5, 6 store material chips generated after cutting at the same time, and minimizes pushing-out against the material located outside the screw to restrain the material from being torn largely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw, and more particularly to a screw shaft having a plurality of recesses on a screw shaft, lightly applying force to the screw to quickly plug it into wood or other material, and to easily screw the screw. The present invention relates to a screw that can prevent a shaft from breaking or a material from being torn.

[0002]

2. Description of the Related Art Conventional screws are shown in FIGS. 1 to 4, and FIGS. 1 and 2 all show a polygonal pyramid A or a conical tail B at the tail of a screw shaft. Use to plug into wood or other materials. 3 and 4 include a groove tank C or a cutting tank D at the tail of the screw shaft. However, FIGS. 1 and 2 show that the screw is a pyramid or conical tail, and the single groove or cutting tub of FIGS. 3 and 4 can be used to test the speed and service when the screw is plugged into a relatively rigid material. Over the course of time, it has been greatly improved or not improved, and causes the screw shaft to break or the material to tear. Therefore, the present inventor has accumulated many years of manufacturing and actual measurement experience, and has motivated to create the present invention by improving the above-mentioned conventional disadvantages.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a screw having a small drag, a high plugging speed, a screw shaft that is not easily broken, and a material that does not tear.

[0004]

SUMMARY OF THE INVENTION A screw of the present invention includes a screw head and a screw shaft, the screw shaft having a screw groove and the following features. The tail end of the screw shaft extends upwardly to form a recess, and the screw shaft comprises at least one further recess. The plurality of concave tanks have a shape in which the concave tanks overlap with each other even when viewed from the horizontal or vertical projection direction from the screw axis center line. The screw of the present invention can be quickly plugged in with light force, because the concave tubs partially overlap or do not overlap each other,
It has the effect that the screw shaft does not easily break or the material does not tear. Alternatively, it extends upward from the tail end of the screw shaft to form a straight or spiral shape and penetrates the concave tank, and this single penetrating concave tank also has the above-mentioned effect.

One feature of the present invention is that the screw shaft is provided with at least two or two or more concave tanks, and the type of the concave tank includes any type of shape, and the middle arc-shaped cutting tank is most preferable. Often, the trough closest to the tail can extend in the direction of the screw head without having to be from the tail end or the tail end.

Another feature of the present invention is that the plurality of concave tanks are projected in the horizontal direction from the center axis of the screw axis, and when viewed in a plane, the concave tanks may or may not overlap.

Another feature of the present invention is that the plurality of concave tanks may or may not overlap when viewed in a projection line perpendicular to the center axis of the screw axis.

The present invention is applicable to any head and groove screws.

In this way, the following will be described with reference to the drawings in order for your reviewers to fully understand the present invention.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A screw according to an embodiment of the present invention has a screw head 1 and a screw shaft 2 (a screw groove 3 on the screw shaft) located below the screw head 1, as shown in FIGS. And a screw tail 4 located at the end of the screw shaft 2.

The screw shaft has two or more concave tanks 5 and 6, and one of the two concave tanks 5 always extends above the screw tail 4, and the other concave tank 6 has a screw shaft. 2, the degree of arc of the two troughs 5, 6 may be of any length in diameter and may or may not be equal to each other. The tank angles may be of any angle and form, and may or may not be the same as each other. In addition, the lengths D, D1 of the two concave tanks 5, 6 may or may not be equal. Further, the length D or D1 is based on the total length of the screw shaft 2, and the depths d and d1 of the concave tanks 5 and 6 are between zero and the outer diameters of the screw shaft and the screw groove 3. Further, when viewed in a horizontal projection plane space (as in the direction A in FIG. 8) or in a vertical projection space (as in the direction B in FIG. 8), the two concave tanks 5 and 6 do not completely overlap. Alternatively, the portions need not overlap.

Thus, the screw of the present invention is obtained. When the two concave tanks 5 and 6 are closest to the vertical projection line at the center line of the screw as shown in FIG. 1, the faster the plugging speed, the higher the resistance. small. In addition, when the screws are plugged in at the same time, the recessed tubs 5 and 6 receive the scraped material, reduce the extrusion of the material around the screw, and greatly reduce the state of material tearing. The concave tank 5 has the same effect and advantages even if it does not start from the screw tail.

Alternatively, as shown in FIGS. 11 and 12,
A plurality of linear concave vessels 10 in which two or two or more are uniformly distributed; or, as shown in FIGS. In fact, the screw of the present invention is an improved type that can be lightly and quickly plugged in even if it hits hard wood or any other material, and does not easily break or crack. The screw of the present invention is an improved product that can be quickly plugged with a light force even with hard wood or other materials, and does not easily break or crack.

[Brief description of the drawings]

FIG. 1 shows a conventional screw.

FIG. 2 illustrates another conventional screw.

FIG. 3 shows yet another conventional screw.

FIG. 4 shows yet another conventional screw.

FIG. 5 is a perspective view showing a screw according to an embodiment of the present invention;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is a sectional view taken along line 7-7 in FIG. 5;

FIG. 8 is a side view of a screw according to an embodiment of the present invention.

FIG. 9 is a view showing a use state of the screw shown in FIG. 8;

FIG. 10 is a view showing a state further screwed from the state shown in FIG. 9;

FIG. 11 is a side view of a screw according to another embodiment of the present invention.

FIG. 12 is a sectional view taken along line 12-12 in FIG. 11;

FIG. 13 is a side view of a screw according to yet another embodiment of the present invention.

FIG. 14 is a cross-sectional view taken along line 14-14 of FIG.

FIG. 15 is a side view of a screw according to yet another embodiment of the present invention.

16 is a cross-sectional view taken along line 16-16 of FIG.

FIG. 17 is a side view of a screw according to yet another embodiment of the present invention.

18 is a cross-sectional view taken along line 18-18 of FIG.

[Explanation of symbols]

 Reference Signs List 1 screw head 2 screw shaft 3 screw groove 4 screw tail 5, 6 concave tank 10 concave tank A polygonal pyramid B cone tail C groove tank D cutting tank D, D1 length of concave tank d, d1 depth of concave tank

Claims (1)

[Claims] Claims 1. A screw head, including a screw shaft including a screw groove, and a screw tail of any type, wherein the screw head and the screw groove of the screw shaft are arbitrary head shapes and grooves, two or two of which are provided on the screw shaft. A plurality of the above-mentioned concave tanks are provided, and the plurality of concave tanks completely overlap with each other when viewed on a horizontal projection plane with respect to the center axis of the screw axis, or when viewed with vertical projection linearity, or partially overlap with each other. Have overlapping or non-overlapping shapes, and / or
Alternatively, a screw comprising a single straight or helical penetrating trough on the screw shaft.