JPH116509A - Drive screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fasten a gypsum board or the like with a screw to a lumber by a drive type thread fastening machine. SOLUTION: A drive screw 1 has a structure with steps of a parallel thread part 4, an intermediate tapered thread part 5 and a small diameter parallel thread 6 starting from a trumpet head 3, and a ridge height of a complete thread from the parallel thread part 4 to the small diameter parallel thread part 6 is constant. After the thread part 6 is driven into a lumber, the drive screw 1 is rotated to be driven in by a drive type pneumatically driven thread fastening machine. Since the thread part 6 has low driving resistance and a high ridge height, great thrust is exhibited without crushing a tapped hole in a rotating process to attain driving-in upto the trumpet head 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving screw, and more particularly to a driving screw for wood.

[0002]

2. Description of the Related Art A driving-type screw driving machine, like a nail driving machine, drives a screw to a steel plate or the like by a driver connected to a piston to a certain extent and drives the driver to rotate and fasten the screw. It is known as a screw tightening machine with a short stroke time and high work efficiency. However, when a wood screw is driven into wood such as cedar wood having a low tissue density by a driving screw tightening machine and rotated, a screw hole of the wood may be broken and sufficient fastening force may not be obtained. In particular, when fixing a gypsum board to wood using a trumpet-shaped wood screw, the propulsion resistance when the wood screw is rotated and the trumpet head sinks into the gypsum board is large, and the wood exceeds the screw load capacity of the wood. Screw holes are often destroyed, and there is an inconvenience that a screw drive machine cannot be used for screwing gypsum board and wood.

[0003] Therefore, there arises a technical problem to be solved in order to enable a screw-fastening operation on wood by a driving-type screw tightening machine, and an object of the present invention is to solve the above-mentioned problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and is intended to drive from a trumpet head through a parallel thread, an intermediate taper thread and a small-diameter parallel thread to a tip taper thread. The present invention provides a driving screw, wherein the height of the small-diameter parallel thread portion is equal to or higher than the height of the parallel thread portion.

Also, a driving screw from the trumpet head to the tip taper thread portion via the parallel thread portion, wherein the root diameter at the tip side is reduced from the middle portion of the parallel thread portion, so that the peak of the tip side root diameter reduction portion is reduced. To provide a driving screw with an increased height.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a driving screw according to claim 1, wherein the driving screw 1 has a parallel screw portion 4 at a lower portion of a trumpet head 3 provided with a cross hole 2, and the parallel screw portions 4 to 15.
A small-diameter parallel screw portion 6 is reached via an intermediate taper screw portion 5 having a taper angle of a degree.

The dimensions of the driving screw 1 illustrated in FIG. 1 are 32 mm in total length, the outer diameter of the trumpet head 3 is 7.8 mm, the outer diameter of the parallel screw part 4 is 3.6 mm, and the outer diameter of the small diameter parallel screw part 6 is 3 mm. is there. The height of the complete thread from the parallel thread 4 to the small diameter parallel thread 6 of the double thread 8 is 0.6 mm, and the height of the thread of the small diameter parallel thread 6 = a, the height of the parallel thread 4 If the height of the mountain is b, it is essential that the relationship a ≧ b be satisfied.

When a gypsum board is screwed to wood using a driving air driven screw driving machine and a driving screw 1, as shown in FIG. 2, the driver is driven by a driving screw driving machine (not shown). The screw 1 is hit to penetrate the gypsum board 9 with the coated paper, and the small-diameter parallel screw portion 6 is driven into the wood 10. Reference numeral 11 denotes a board-coated paper.

Subsequently, the driver of the screw tightening machine starts rotating, and the driver fits into the cross hole of the trumpet head 3,
The driving screw 1 rotates and penetrates the wood 10 while drilling and tapping. The height of the ridge of the small diameter parallel screw portion 6 is equal to or higher than the height of the ridge of the parallel screw portion 4 driven into the gypsum board 9, so that the screw hole is not broken during rotation. When the trumpet head 3 is buried in the gypsum board 9, a thrust exceeding the propulsion resistance is generated and the trumpet head 3 is screwed. Then, as shown in FIG. 3, when the height of the trumpet head 3 is screwed down slightly below the surface of the gypsum board 9, the rotation of the driver is stopped by the torque limiting mechanism of the driving screw tightening machine.

FIG. 4 shows an embodiment according to the second aspect of the present invention. The driving screw 12 has a trumpet head 14 provided with a cross-shaped hole 13 and a tapered screw portion at the tip of a parallel screw portion 15 having an outer diameter of 3.55 mm. 16 are formed. Parallel thread part 1
The valley diameter of 5 is 2.1 mm from the head side to the middle part, and is reduced to 1.8 mm from the middle part through the tapered part to the tip side. Accordingly, the shape of the valley is substantially the same as the stepped shape of the driving screw 1 shown in FIG. 1, but the outer diameter of the parallel screw portion 15 is constant, so that the height of the peak is higher on the tip side than on the head side. Has become.

[0011] By increasing the height of the crest on the tip side, the thread on the tip side driven into the wood surely bites into the wood without breaking the screw hole when the screw is rotated, and the trumpet head 14 becomes the gypsum board. A thrust exceeding the propulsion resistance when buried in the plaster is obtained, and the gypsum board can be securely fixed to the wood like the driving screw 1 in FIG.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible within the technical scope of the present invention, and it goes without saying that the present invention extends to those modifications. is there.

[0013]

As described above, the driving screw according to the present invention is different from the conventional wood screw in which the height of the screw thread decreases toward the tip of the screw, and is different from the conventional wood screw in which the screw is screwed into the wood. Is higher than or equal to the height of the peak on the head side, so that a large thrust can be obtained during rotation after driving, and secure fastening can be achieved. Therefore, screwing work of wood, gypsum board and the like by the driving-type screw tightening machine becomes possible, which can contribute to improvement of work efficiency.

[Brief description of the drawings]

FIG. 1 shows a driving screw of the invention according to claim 1,
(A) is a plan view and (b) is a front view.

FIG. 2 is a sectional view showing a state at the time of driving of the driving screw of FIG. 1;

FIG. 3 is a sectional view showing a state where the driving screw is rotated and fastened from the state of FIG. 2;

FIG. 4 shows a driving screw of the invention according to claim 2,
(A) is a plan view and (b) is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driving screw 2 Cross hole 3 Trumpet head 4 Parallel screw part 5 Intermediate taper screw part 6 Small diameter parallel screw part 7 Tip taper screw part 8 Double thread 9 Gypsum board 10 Wood 11 Board covering paper 12 Driving screw 13 Cross hole 14 Trumpet head 15 Parallel Screw part 16 Tip taper screw part

Claims (2)

[Claims] 1. A driving screw from a trumpet head (3) to a tip taper screw portion (7) through a parallel screw portion (4), an intermediate taper screw portion (5), and a small-diameter parallel screw portion (6). A driving screw in which the height of the parallel screw part (6) is equal to or higher than the height of the parallel screw part (4). 2. A driving screw from a trumpet head (13) to a tip taper screw part (14) through a parallel screw part (15), wherein a root diameter from an intermediate part of the parallel screw part (15) to a tip side is reduced. And a driving screw in which the height of the ridge of the tip side valley diameter reduction portion is increased.