JP3332078B2 - Driving screw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving screw of the type which is driven into a material and then driven.

[0002]

2. Description of the Related Art A screw driving machine for a driving screw has a driver bit linked to a striking mechanism and a rotary driving mechanism, driven by the striking mechanism to drive the driving screw, and then driven by the rotary driving mechanism. It rotates with respect to the driving screw. Therefore, a cross-shaped hole is formed in the screw head of the driving screw, and the blade at the tip of the driver bit is fitted into the cross-shaped hole and rotated at the time of driving.

[0003]

However, at the time of driving, the cutting edge of the driver bit does not always fit properly in the cross hole of the screw head of the driving screw. For example, if the driver bit rebounds due to the impact of driving,
Once the cutting edge of the driver bit has been fitted into the cross-shaped hole, it pops out of the cross-shaped hole, as shown in FIG.
May enter. Since the driving screw 21 is hit at a position off the center, the driving screw 21 is inclined as shown in FIG. 2B. Therefore, even if the driver bit 22 is rotated in this state, the center of the cross hole becomes higher. However, the driver bit 22 does not move to the center of the wing portion 20 and runs idle, which causes a phenomenon that the screw cannot be tightened.

[0004] It is an object of the present invention to solve the above-mentioned problems and to provide a driving screw capable of reliably guiding the cutting edge of the driver bit to the center of the cross wing portion of the screw head.

[0005]

In order to solve the above-mentioned problems, a driving screw according to the present invention is formed by crossing two slotted holes in the surface of a screw head in a cross shape, and each wing is located at the center. A wide cross-shaped hole is formed from the front, and around the center, a diagonal line connecting the corners of the center is sandwiched, on both sides thereof, and from the outside , the center line side of the center and the wing portion Forming a flat inclined surface inclined toward the outer surface, the outermost portion of the inclined surface being located outside the wide portion of the wing portion, and a point where each of the inclined surfaces meets the above-mentioned corner portion and the wing. The angle between the line connecting the starting point where the ridge line meets the ridgeline of the screw head should be 15 ° or more ,
The tip of the screwdriver bit with the center
It is characterized by being guided to the department .

Further, the drive screw according to the present invention, the periphery of the central portion to form a concave recess surface inclined toward the center side from the outer, the outermost recess surfaces of the wings An angle formed by a line connecting the point meeting the inside corner and the starting point meeting the ridgeline of the wing with the surface of the screw head at an angle of 15 ° or more, while being located outside the wide portion, > and to, the driver bit strikes the wings of the cross bore
Guiding the tip to the center along the slope.
Features.

[0007]

FIG. 1 is a side view of a driving screw, and FIG.
3 is an enlarged plan view, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIG. 4 is a cross-sectional view taken along line BB of FIG. In these figures, reference numeral 1 denotes a head of a driving screw, and 2 denotes a shaft. A cross hole 3 is formed in the surface of the head 1 of the driving screw. The cross hole 3 is formed by crossing two slots in a cross shape. The bottom of the crossed center portion 4 is formed in an inverted conical shape, and the bottom of each wing portion 5 is directed toward the center portion 4. It is formed to be lower. A ridge line 6 formed by each wing 5 with the surface of the head 1 is parallel from the tip to the middle, but is formed to be wide and non-parallel from a point 7 in the middle (before the center 4). I have. The wide ridgeline 8 meets the adjacent ridgeline 8 at a position facing the center portion 4 and forms an entering corner 9.

Around diagonal lines p and q connecting the corners 9 of the central portion 4 around the central portion 4,
A flat inclined surface 1 inclined from the outside toward the center 4
0 and 10 are formed. In addition, this inclined surface 10, 1
The outermost part 11 of 0 is formed so as to be located outside the base point 7 of the wide part of the wing part 5.

In each of the inclined surfaces 10, the above-mentioned corner 9
Is formed so that an angle α formed by a line 15 connecting the point 13 where the edge meets the ridge line of the wing portion 5 with the surface of the screw head is 15 ° or more. The reason is that the driver bit 16 is shifted from the center of the cross hole 3 as shown in FIG.
It is expected that the angle of inclination when riding on the vehicle is about 10 ° at the maximum. Even in this case, in order for the inclined surface 10 to still be inclined toward the center of the wing portion 5 with respect to the regular head 1 surface, the above angle is required. Is required to be about 15 ° or more.

If the angle α becomes 15 °, the inclined surfaces 10 adjacent to each other across the diagonal lines p and q are inevitably.
The angle β formed by the ridge line 12 formed by the screw head 10 and the surface of the screw head is 35 °. Therefore, the angle β needs to be 35 ° or more.

According to the above configuration, when striking the blade portion 5 tip 16a of the driver bit 16 is off-center of Cross hole 3 as shown in FIG. 4, the inclination of the drive screw 1
However, the angle α formed by the line 15 connecting the point 13 meeting the corner 9 on the inclined surface 10 and the starting point 14 meeting the ridge line of the wing 5 with the screw head surface is 15 ° or more ( The angle β is set to be equal to or greater than 35 °), so that the inclined surface 10 is still at the center of the wing portion 5 with respect to the regular head 1 surface.
Since the driver bit 16 is inclined to the line side, the tip of the driver bit 16 slides down along the inclined surface 10 and is guided to the center portion 4.

Therefore, the tip of the driver bit 16 is driven into the wing 5 which is off the center 4 of the driving screw,
Even if the driving screw is inclined, the cutting edge 16a of the driver bit 16 can be securely guided and fitted into the center of the cross hole 3 of the screw head 1.

FIG. 5 is an enlarged plan view of another example of the driving screw, FIG. 6 is a cross-sectional view taken along line CC of FIG. 5, and FIG. 7 is a cross-sectional view taken along line DD of FIG. is there. In these figures, a cross-shaped hole 3 is formed on the surface of the head 1 of the driving screw. The cross hole 3 is also formed by crossing two wings 5 in a cross shape. The bottom of the crossed center 4 is formed in an inverted conical shape, and the bottom of each wing 5 faces the center 4. It is formed to be lower. The ridge line 6 formed by the wings 5 with the head surface is parallel from the tip to the middle, but is wide and non-parallel from a point 7 on the way (before the center 4). . The wide ridgeline 8 meets the adjacent ridgeline 8 at a position facing the center portion 4 and forms an entering corner 9.

Next, in the driving screw, a concave concave surface 18 which is inclined from the outside toward the central portion 4 is formed around the central portion 4. The outermost portion 19 of the concave surface 18 is formed outside the base point 7 of the wide portion of the wing portion 5.

Next, the angle δ formed by the line connecting the point meeting the corner 9 and the starting point meeting the ridge line of the wing 5 on the surface of the screw head 1 on each recessed surface 18 is 15 ° or more. It is set to be. When the angle γ becomes 15 °, the diagonal lines p and q connecting the corners 9 of the central part 4 are formed.
Is set to be 35 ° or more. The reason for setting the angle is the same as that described above.

Therefore, in the case of the driving screw having the above-described configuration, the driver bit 16 is securely fitted into the center portion 4 of the cross hole 3 at the time of driving for the same reason as described above.

[Brief description of the drawings]

FIG. 1 is a side view of a driving screw according to the present invention.

FIG. 2 is an enlarged plan view of the driving screw.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is a cross-sectional view taken along line AA of FIG. 2;

FIG. 5 is a plan view of another example of a driving screw.

FIG. 6 is a sectional view taken along the line CC of FIG. 5;

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

FIGS. 8 (a) and (b) are conventional driving screw heads and driver bits.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw head 3 Cross-shaped hole 4 Center part 5 Wing part 9 Corner angle part 10 Inclined surface 12 Ridge line 15 Line 18 Depressed surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 60-101207 (JP, U) Japanese Utility Model Showa 58-33812 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16B 23/00 F16B 25/00

Claims (2)

(57) [Claims] 1. A cross-shaped hole formed by crossing two slot holes on the surface of a screw head in a cruciform shape, and each wing portion being widened from just before the center portion. The center and the wings are placed on both sides of the diagonal line connecting the corners of the center, from the outside.
A flat inclined surface that is inclined toward the center line side of the wing portion, and the outermost portion of the inclined surface is located outside the wide portion of the wing portion, and at each of the inclined surfaces, at the corner angle portion. de encounter point and the line connecting the starting point encounter ridges of wings as 15 ° or more the angle between the screw head surface, hit the wings of the cross bore
Place the tip of the driver bit at the center along the slope.
A driving screw characterized by guiding . 2. A cruciform hole formed by crossing two wings on the surface of a screw head in a cross shape and widening each wing from a position short of a center portion. Forming a concave concave surface inclined from the outside toward the center portion side , the outermost of the concave surface is located outside the wide portion of the wing portion, and the concave corner portion in the concave surface the angle at which the line connecting the starting point to meet the ridge point and wings to meet makes with the screw head surface as a 15 ° or more, hit the wings of the cross recess Dora
Plan the tip of Ivabit in the center along the slope
A driving screw characterized by being inside .