Nails with screws

Abstract

To provide a nail with a screw capable of increasing a surface area of a multi-threaded screw, to strengthen fixing force obtained by frictional force due to an adhesion portion of a wooden material.SOLUTION: A nail with a screw is composed of a shaft part 4, a head part 2 provided at one end of the shaft part 4 and a sharp part 3 provided at the other end, where a helical multi-threaded screw 5 is formed on the shaft part 4, and a plurality of locking grooves 7 is provided in a mountain part 6 of the multi-threaded screw 5. A long concave groove 10 is formed along a spiral direction on an outer surface of a spiral top part in the mountain part 6 of the multi-threaded screw 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a nail with a screw used for fastening wooden materials, for example. [Background technology]

[0002] Examples of nails equipped with screws include screw nails equipped with a single screw and tile fixing nails equipped with multiple peripheral ridges and screws. The former screw nails, as in Patent Documents 1 to 4, have a head at one end and a sharp point at the other end, and multiple threads with a large lead angle formed on the outer surface of the shaft. When the nail is driven into wood, the multiple threads are driven into the nail while rotating along a driving hole that matches the cross-sectional shape of the shaft.

[0003] Furthermore, the latter tile fixing nail, as in Patent Document 5, has a structure in which a large number of peripheral ridges are formed on the outer surface of a long shaft with a head at one end and a sharpened portion at the other end, located in the front half of the sharpened portion, and a multi-thread screw is connected from the rear end of this peripheral ridge group and located in the rear half between the head and the head; when the nail is driven in to fix a tile, the multi-thread screw is screwed into the tile batten, and due to the cross-sectional shape of the shaft created by the multi-thread screw, it is driven in while rotating.

[0004] These screw nails and tile fixing nails have the advantage that the shaft rotates as it is driven into the wood, allowing them to be driven efficiently without causing cracks or other damage to the wood. However, they have the problem that even after the screw has been driven in, the screw is likely to be guided along the driving hole in a loosening direction, making it prone to loosening due to vibrations, etc.

[0005] Therefore, conventional screw nails and nails for fixing tiles, as shown in Patent Documents 1 to 5, have many locking grooves in the crest of the screw part, and these locking grooves engage with the wood material in the direction of removal, preventing loosening due to vibration, etc.

[0006] Providing a large number of retaining grooves as described above provides a more effective prevention of slipping out than when no retaining grooves are provided, but in recent years, in fields where screw nails and tile fixing nails are used, there has been a demand for proposals for products that offer even stronger fixing strength.

[0007] For this reason, the inventors of the present application conducted extensive research into increasing the fixing strength of screw nails and the like, and as a result, they noticed that a factor other than the above-mentioned retaining groove was the relationship between the amount of contact between the outer surface of the multi-thread screw and the wooden material, and concluded that it was necessary to increase the amount of contact between the outer surface of the multi-thread screw and the wooden material, thereby increasing the frictional force caused by the contact area between the two and the gripping force caused by the shrinkage of the wooden material.

[0008] As is clear from Patent Documents 1 to 5, conventional screw nails and multi-thread screws for tile fixing have a cross-sectional shape that simply consists of alternating narrow crests with flat outer surfaces and arc-shaped recessed valleys that connect to these crests. Therefore, no particular attempt has been made to increase the surface area of ​​the multi-thread screw, and no thought has been given to increasing the surface area of ​​the multi-thread screw to strengthen its fixing power. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Utility Model Application Publication No. 3-98312 [Patent Document 2] Japanese Patent Application Publication No. 61-33729 [Patent Document 3] Publication No. 3-54964 [Patent Document 4] Jikko No. 56-28329 [Patent Document 5] Japanese Patent Application Laid-Open No. 2003-27669 Summary of the Invention [Problem to be solved by the invention]

[0010] Therefore, the object of this invention is to provide a nail equipped with a screw that maximizes the surface area obtained by the cross-sectional shape of the multi-thread screw and can strengthen the fixing force due to the frictional force at the contact area between the surface of the multi-thread screw and the wood material. [Means for solving the problem]

[0011] In order to solve the above-mentioned problems, the invention of claim 1 provides a nail comprising a shank, a head provided at one end of the shank, and a sharpened portion provided at the other end, wherein a spiral multi-thread screw is formed on the shank, and a plurality of engagement grooves are provided at positions on the same circumference on the crests of the multi-thread screw, and the engagement grooves are arranged at predetermined intervals in the axial direction of the shank, wherein the spiral crests of the multi-thread screw have a width on the top outer surface, and a long concave groove is formed along the spiral direction on the top outer surface of the crests. The recessed groove is divided by a hook groove provided in the multi-thread screw, and the depth of the recessed groove is shallower than the deepest part of the hook groove. This is what was done.

[0013] Claim 2 In the invention of the present invention, the relationship between both ends of the recessed groove and the latching groove is such that communication between them is blocked by closing portions provided in the latching groove.

[0014] Here, in the case of screw nails used to fasten wooden structures, they have a structure in which a multi-thread screw is formed between the sharp tip of the shank and a position close to the head, and in the case of nails for fixing tiles, a multi-thread screw is formed between approximately the middle of the shank and a position close to the head, and a group of peripheral ridges is provided between the sharp tip and the multi-thread screw, and the group of peripheral ridges is driven into the roof underlayment, and the multi-thread screw penetrates the tile batten; in both types of nails, fixing force is obtained by the contact between the surface of the multi-thread screw and the wooden material.

[0015] The hook grooves provided on the crests of the multi-thread screw are formed by a hook step that extends from the outer surface of the top of the screw crests at approximately right angles to the axis of the shaft, and an inclined peripheral surface that widens outward from the inner end of this step toward the head.The recessed grooves formed on the outer surface of the top of the crests of the multi-thread screw are divided by the hook grooves and extend over the entire length of the multi-thread screw, and both ends of the recessed grooves are blocked from communication with the hook grooves by closing sections provided in the hook grooves.

[0016] In addition, the depth of the end portion located on the head and sharp tip side of the groove gradually becomes shallower toward the above-mentioned latching step portion, and in the case of a nail for fixing tiles, the end portion facing the head side end portion of the peripheral protrusion group is closed by the peripheral protrusion. [Effects of the Invention]

[0017] According to this invention, in a screw nail having a helical multi-thread screw formed on the shank, and a plurality of hooking grooves provided at positions on the same circumference on the crest of this multi-thread screw, and a group of these hooking grooves arranged at predetermined intervals in the axial direction of the shank, the crest of the multi-thread screw has a wide outer surface at the top of the spiral, and long grooves are formed in the outer surface of the crest along the spiral direction, so that the surface area of ​​the multi-thread screw can be increased as much as possible by the grooves provided on the outer surface of the crest top, within the range that does not impede the screwing action, and this makes it possible to strengthen the fixing force obtained by the friction force caused by the contact area between the surface of the multi-thread screw and the wood material.

[0018] Furthermore, when screwed into a wooden structural material, the restored wooden material fills the retaining grooves and recessed grooves provided on the outer surface of the top of the crest, and this embedded wooden material engages in the pull-out direction, providing a pull-out resistance effect.By forming recessed grooves on the outer surface of the top of the crest, the amount of embedded wooden material increases, thereby improving the pull-out resistance strength accordingly.

[0019] Furthermore, if the communication between both side ends of the groove and the hooking groove is blocked, the wooden material filling the groove will not move between the groove and the hooking groove, and the pull-out resistance strength obtained by the enclosed wooden material can be increased.Even if a groove is provided, the wooden material is enclosed within the hooking groove, so the hooking step portion of the hooking groove can effectively function as a pull-out resistance portion. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a front view showing an example of a screw nail in the nail provided with a screw according to the present invention. [Figure 2] FIG. 1 is a front view showing an example of a nail for fastening roof tile roofs, which is equipped with a screw according to the present invention; [Figure 3] Enlarged cross section of the multi-start screw at arrow aa in Figure 1 [Figure 4] Enlarged cross-sectional view of the tip of the multi-thread screw in Figure 3 [Figure 5] Enlarged cross-sectional view of the tip of a multi-thread screw taken along the spiral shape DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0022] The screw nail 1 shown in Figure 1 has a multi-thread screw 5 with a large lead angle formed on the outer surface of a shank 4, which has a head 2 at one end and a sharp point 3 at the other end.The threads 6 of this multi-thread screw 5 have multiple locking grooves 7 at positions on the same circumference, and these locking grooves 7 are arranged at predetermined intervals in the axial direction of the shank 4.

[0023] When this screw nail 1 is driven into a wooden material, it forms a driving hole that matches the cross-sectional shape of the shank 4 by the multiple screw 5, and is driven in while rotating along this hole, thereby fastening the wooden material together.

[0024] The tile fixing nail 1a shown in Figure 2 has a structure in which a multi-thread screw 5 is formed on the outer surface of a shaft 4 having a head 2 at one end and a sharpened portion 3 at the other end, from approximately the middle of the shaft 4 to a position close to the head 2, an unthreaded portion 8 formed between the multi-thread screw 5 and the head 2, and a retaining portion 9 formed by a group of peripheral protrusions 9a similar to those in Patent Document 5 between the sharpened portion 3 and the multi-thread screw 5, and a plurality of retaining grooves 7 are formed at positions on the same circumference in the crest portion 6 of the multi-thread screw 5, and these retaining grooves 7 are arranged at predetermined intervals in the axial direction of the shaft 4.

[0025] This tile fixing nail 1a is used to fix roof tiles to tile battens. When the nail is hammered in to fix the tile, the retaining portion 9 penetrates the roof underlayment, the multiple thread screw 5 is screwed into the tile batten, and the non-threaded portion 8 penetrates the pilot hole in the tile, with the head 2 pressing down on the tile to fix it.

[0026] As shown in Figures 1 and 2, the multi-thread screw 5 is formed by assembling multiple screw grooves 5a with a large lead angle, and as shown in Figure 3, the crests 6 and valleys 6a are alternately connected, and the crests 6 have a cross-sectional shape that protrudes in all directions, for example, and the crests 6 form a spiral with a large pitch along the axial direction of the shank 4, and the outer surface has a thickness in the circumferential direction of the shank 4.

[0027] As shown in Figure 5, the hook groove 7 provided in the thread portion 6 of this multi-thread screw 5 is formed by an inclined surface 7a that gradually widens toward the sharp tip portion 3 side, and a hook step portion 7b that extends from the edge of this inclined surface 7a located on the sharp tip portion 3 side in the direction opposite to the axis of the shank portion 4 and forms a right angle or an acute angle with the axis.

[0028] As shown in Figures 3 to 5, a long groove 10 is formed in the spiral direction on the outer surface of the top of the ridge portion 6 of the multi-start screw 5, and this groove 10 is shallower than the deepest part of the locking groove 7, recessed in an arc or V shape, and is divided by the locking groove 7. The end on the sharp portion 3 side of each divided groove 10 is blocked from the inside of the locking groove 7 by a closing portion 7c that maintains the inclined surface 7a, and the end on the head 2 side is blocked from the locking groove 7 by a closing portion 7d that maintains the locking step 7b. The depth of the end of the groove 10 located on the head 2 and sharp portion 3 side gradually decreases toward the locking step 7b, and in the case of the tile fixing nail 1a, the end of the group of peripheral ridges 9a that faces the end on the head 2 side is closed by the peripheral ridge 9a.

[0029] The nails equipped with screws of this invention are configured as described above, and in the case of the screw nail 1, they join wooden materials, and in the case of the tile fastening nail 1a, they fasten tiles to tile battens.In either case, the multiple screw 5 is driven into the wooden material to achieve a fixed state.

[0030] In other words, when the multi-thread screw 5 is driven into the wooden material, it pushes the wooden material apart by an amount commensurate with its cross-sectional area as it is screwed in, and the wooden material comes into contact with the surface of the multi-thread screw 5. However, the part of the wooden material that has been pushed apart is pressed against the surface of the multi-thread screw 5 by its restoring force, and the frictional force and holding force obtained by the contact surface due to this pressure strengthen the fixing force to prevent loosening or coming off.

[0031] At this time, a long groove 10 is formed along the spiral direction on the outer surface of the top of the ridge portion 6 of the multi-thread screw 5, and the recessed groove 10 increases the surface area. Therefore, the groove 10 can maximize the surface area of ​​the multi-thread screw without interfering with the screwing operation of the multi-thread screw 5. This increases the contact area between the multi-thread screw 5 and the wood material, increasing the frictional force and holding force that prevent loosening or coming off.

[0032] Furthermore, the wooden material stored in the retaining groove 7 and the recessed groove 10 provided in the crest 6 of the multiple screw 5 contributes to the pull-out resistance strength, but by storing wooden material in the recessed groove 10 in addition to the retaining groove 7, the amount of wooden material trapped can be increased, thereby strengthening the pull-out resistance strength accordingly, and since both ends of the recessed groove 10 are cut off from communication with the retaining groove 7 by closure portions 7c and 7d, the wooden material filling the retaining groove 7 and the recessed groove 10 does not move between the retaining groove 7 and the recessed groove 10, and by trapping the wooden material within the retaining groove 7 and the recessed groove 10 in this way, the pull-out resistance function obtained by this wooden material can be made to work to the maximum. As a result, even when the recessed groove 10 is provided, the wooden material is trapped within the retaining groove 7, so the retaining step 7b of the retaining groove 7 can effectively function as a pull-out resistance portion. [Explanation of symbols]

[0033] 1 screw nail 1a Tile fixing nails 2 heads 3 Sharp tip 4 Shaft 5 multi-start screw 5a screw groove 6 Yamabe 6a Tanibe 7 Latch groove 7a Slope 7b Latch step 7c Closure 7d closure 8 Non-threaded section 9 Retaining part 9a Peripheral ridge 10 Groove

Claims

1. A nail equipped with a screw comprising a shank, a head provided at one end of the shank, and a sharpened portion provided at the other end, wherein a helical multi-thread screw is formed on the shank, and a plurality of hooking grooves are provided at positions on the same circumference on the crests of the multi-thread screw, and the groups of hooking grooves are arranged at predetermined intervals in the axial direction of the shank; the multi-thread screw has a spiral crest with a width on its top outer surface, and long grooves are formed on the top outer surface of the crest along the spiral direction, the grooves are divided by hooking grooves provided on the multi-thread screw, and the depth of the grooves is shallower than the deepest part of the hooking groove.

2. 2. The nail with a screw according to claim 1, wherein the connection between both ends of the recessed groove and the locking groove is blocked by closing portions provided in the locking groove.

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