JPH0620911U - Driving screw - Google Patents

Abstract

(57) [Summary] [Purpose] Easy to drive and exhibit a strong fastening force.
Also, provide a driving screw that can be easily removed. A guide screw 3 having a large lead is provided on a shaft portion 2 following a head portion 1 on which a rotary tool engaging portion 6 is formed, and a lead screw having a larger lead than the guide screw 3 is provided on a tip portion of the shaft portion 2. With a small fastening screw 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a driving screw which is easy to drive and can exert a strong fastening force.

[0002]

[Prior art]

 For example, various screws such as wood screws, tapping screws, coach screws, and driving screws are used to fasten construction board boards and pillars. In the construction field, where relatively high strength is strongly demanded, a driving screw in which a guide screw with a large lead is provided on the shaft portion following the head is widely used.

However, in the conventional driving screw of this type, although the driving workability and the fastening force are relatively excellent, when the need for re-tapping occurs, the head of the driving screw is hooked with a burl or the like. It is necessary to pull out the wood, and the work is not only troublesome, but also there are various problems such as damage to the wood during the work of pulling out and bending of the shaft so that it cannot be reused.

[0004]

[Problems to be solved by the device]

 The present invention solves the above-mentioned conventional problems, the driving work can be performed extremely easily like the conventional driving screw, and the fastening force is far superior to the conventional one. In addition, even if it is necessary to re-strike or the like, it is possible to perform the extraction work very easily, and it is also possible to extract it without deforming the timber or the shaft part, and it is an economical screwdriver. It was completed for the purpose of doing.

[0005]

[Means for Solving the Problems]

 The driving screw of the present invention made in order to solve the above-mentioned problem is a driving screw in which a guide screw with a large lead is provided in the shaft portion continuing to the head, and the leading end of the shaft portion is more than the guiding screw. It is characterized in that a fastening screw having a small lead is provided and a turning tool engaging portion is provided on the head.

[0006]

[Action]

 With such a structure, if the head is hit with a hammer etc. and driven into the fastened member, it is guided by the guide screw with a large lead provided on the shaft portion without causing misalignment. The smooth driving is similar to the conventional driving screw of this type, but in the present invention, since the tip of the shaft is formed as a fastening screw with a small lead, a guide screw with a large lead after driving is used. And the fastening screw with a small lead at the tip of the guide screw, it is firmly fastened to the member to be fastened, and when it is desired to pull out the driving screw for re-strike or some other reason, it is formed on the head. If the head is lifted slightly from the fastened member by rotating it in the reverse direction using the rotating tool engaging part, the rotation can be continued or the nail puller can be engaged with the lifted head. And thus capable of performing easily withdrawn work without deforming the shank or damage the surface of the workpieces by pulling.

[0007]

【Example】

 The present invention will now be described in detail with reference to the illustrated embodiment. The drawing shows a driving screw used for construction work. In the figure, 1 is a head part, 2 is a shaft part, 3 is a large lead provided almost all over the shaft part 2 except for the front part thereof. Screws 4 are fastening screws provided on the tip of the shaft 2 following the guide screw 3.

The lead of the fastening screw 4 is smaller than the lead of the guide screw 3 provided on the shaft portion 2. In the embodiment, as shown in FIG. 2, a double thread screw is used. The outer diameter D2 of the larger thread is larger than the outer diameter D1 of the thread of the guide screw 3, and the outer diameter D3 of the smaller thread is the outer diameter D of the thread of the guide screw 3. It is almost equal to 1. In addition to the embodiment, the fastening screw 4 may be a single-thread screw, a multi-thread screw, or the like. In either case, the outer diameter D3 of the smaller thread is the thread of the guide screw 3. It is preferable that the outer diameter D1 of the crest is approximately equal to the outer diameter D1 of the crest, so that the screw of the present invention can be screwed in, for example, when there is a gap between the plates when fastening a plurality of plates. When moved, the plate material greatly advances at the portion of the guide screw 3 having the large lead, while the plate material does not advance slightly at the portion of the fastening screw 4 having the small lead, resulting in elimination of the gap between the plate materials. It becomes possible to make a close contact. In addition, it is preferable to increase the pitch of the threads having the maximum outer diameter D2 so as to reduce the resistance at the time of driving by using a double-start screw or a multi-start screw having more threads as in the embodiment. As shown in the drawing, by making the upper part of the screw thread having the maximum outer diameter D2 substantially horizontal and making the lower part a tapered surface that reduces its diameter toward the tip, easy driving and strong fastening force can be exerted. It is preferable that

Further, in the embodiment, projections 5 for preventing plate cracks are formed at equal intervals on the back surface side of the head 1, and the projections 5 are formed on the surface of the member to be fastened after driving. It is configured to prevent cracking of a plate material or the like to be fastened when biting into and after driving, and the head 1 is provided with a rotary tool engaging portion 6 such as a screwdriver on the top surface, for example. When it is necessary to pull out the screw by forming a groove of positive or negative shape on the head or molding the head 1 in an outer shape that engages with a non-circular socket such as a delta shape or a hexagonal shape. When the rotating tool is engaged with the rotating tool engaging portion 6 and is rotated in the reverse direction, the head 1 is slightly lifted from the member to be fastened by the action of the fastening screw 4. In order to manufacture such a driving screw, a rectangular rod formed by forging the head 1 is twisted to form a guide screw 3, and only the tip portion is processed by a rolling die or the like. The manufacturing method such as forming the fastening screw 4 is arbitrary.

With such a structure, when the head portion 1 is hit with a hammer or the like to drive the shaft portion 2 into the member to be fastened, the shaft portion 2 is attached to the guide screw 3 having a large lead. It is similar to the conventional driving screw of this kind that it can be driven in smoothly without causing misdirection, but in the present invention, the tip of the shaft portion 2 has a smaller lead than the guide screw 3 described above. Since the fastening screw 4 is formed, after the driving, the guide screw 3 having a large lead and the fastening screw 4 having a small lead are firmly fastened to the fastened member as if they were fastened with a general wood screw. Become. Then, if it is desired to remove the driving screw for another reason after the driving, the rotating tool is engaged with the rotating tool engaging portion 6 formed on the head 1 and the shaft portion 2 is reversely rotated. Then, the head 1 will be slightly lifted from the member to be fastened, so if the head 1 is kept rotating or if the nail puller is engaged with the lifted head 1 to pull it out, the surface of the member to be fastened may be damaged or the shaft portion may be damaged. It is possible to easily pull out 2 without deforming it, and it is possible to reuse the pulled out one.

[0011]

[Effect of device]

 As is clear from the above description, the present invention enables the driving work to be performed very easily like the conventional driving screw, and the fastening force thereof is far superior to the conventional one. In addition, even if it is necessary to re-strike, the extraction work can be performed very easily, and it is possible to extract it without deforming the shaft part and it can be reused, and it is also excellent in economic efficiency. It is possible. Therefore, the present invention has a great practical value as a driving screw that eliminates the conventional problems.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a shaft portion according to an embodiment of the present invention.

[Explanation of symbols]

 1 Head 2 Shaft 3 Guide Screw 4 Fastening Screw 5 Protrusion 6 Rotating Tool Engagement Part

Claims (3)

[Scope of utility model registration request] 1. A driving screw in which a shaft (2) following a head (1) is provided with a guide screw (3) having a large lead, wherein the guide screw (3) is provided at the tip of the shaft (2). A driving screw characterized in that a fastening screw (4) having a smaller lead than that of 3) is provided and a rotary tool engaging portion (6) is provided on the head portion (1). 2. The driving screw according to claim 1, wherein the fastening screw (4) is a multiple thread screw. 3. A projection for preventing plate cracks on the back side of the head (1)
The driving screw according to claim 1 or 2, wherein (5) is formed.