JP2006022915A - Nail and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nail having a function of a screw and capable of being easily pulled out. <P>SOLUTION: This nail N is provided with a screw part T formed on at least a tip end part side of a main body shaft part 1o, and a nail-driving recessed part 1c on an end face of a head part 1a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a nail and a method for manufacturing the nail.

  Conventionally, nails such as thick iron round nails, thin iron round nails, iron round nails, etc. are processed in a polishing nail process after iron wire is processed into a predetermined shape and size in the nail making process as shown in the process diagram of FIG. A product made by polishing, or a nail that has been polished is subjected to heat treatment such as quenching and tempering, and a product that has been plated, or a nail that has been polished, or colored paint is applied to the nail that has been polished. And the like in a connecting process such as a resin, a sheet, a wire or the like in a coil shape or a stick shape. When these nails are used to join wood and wood or wood and hardware in wooden construction, wooden pallets, wooden frame packaging, etc., the nails head is hit with a hammer or by an automatic nailing machine. And driven into the wood.

  On the other hand, as in the case of a nail, a screw used for joining wood and wood or wood and hardware is a pin in which both ends of an iron wire are cut at right angles at predetermined lengths in a header process as shown in the process diagram of FIG. Next, after pre-molding the pin head side with the first punch, the second punch is used to make a hexagonal, square, cross-shaped, etc., screw-in recess to make the head part The tip end side of the pin that is formed is finished in a blank state while being cut at right angles to the axis, and in the next rolling process, a thread and a valley are formed in a spiral shape at the same time on the tip side. Is formed into a conical shape to form a screw tip. In general, some products are made into a product by performing quenching / tempering treatment and surface treatment such as plating or colored coating, and after the surface treatment, they are connected in a coil shape in a connecting step.

  However, with conventional nails, in order to extract the nail once it has been driven into the wood, it is necessary to perform extraction work using a tool such as a bar. In addition to the high cost of dismantling, the wood part around the nail is destroyed, so that it is not possible to reuse the wood.

  Further, in the manufacture of the screw, there is a problem that the material cost is high because the material loss generated at the time of processing the screw tip is larger than that in the case of the nail. Also, in the case of screws, both manually and automatically, the screws are screwed into the wood while being turned, so that construction takes time and labor costs are high.

  An object of this invention is to provide the nail which also has the function of a screw and can perform extraction easily in view of said subject. A further object of the present invention is to provide a production method that can produce the nail efficiently and inexpensively with little material loss.

  Means for solving the above problems will be described with reference numerals in the embodiments described later. In the nail N according to claim 1, a threaded portion T is formed on at least the distal end side of the main body shaft portion 1o. A nail turning recess 1c is formed on the end face of the head 1a.

  A second aspect of the present invention is the nail according to the first aspect, wherein the thread m of the screw portion T has an inclined surface 29 having a downward slope that is loose toward the tip of the nail with respect to the axis G of the main body shaft portion 1o, and the loose descending surface. The inclined surface 29 is adjacent to the rear end of the inclined surface 29 and is close to an orthogonal surface orthogonal to the axis G of the main body shaft portion 1o. And an inclined surface 30 adjacent to the front end thereof and close to the orthogonal surface.

  In the method for manufacturing a nail according to claim 3, the metal wire 10 is fed to the cutting position S1, and the tip end side of the metal wire 10 is sandwiched between the pair of dies 4a and 4a on the front side of the cutting position S1. The tip of the metal wire 10 is on the front side of the cutting position S1, and the nail head 1a is placed on the tip of the metal wire 10 by hitting the tip 5 with a punch 5 having a recess forming projection 5a. And forming a recess 1c on the end face of the nail head 1a and feeding the metal wire 10 by a predetermined length, and then cutting the metal wire 10 by the cutting device 8 at the cutting position S1 and the cutting end portion. 1b is formed into a pointed shape to form a nail blank 1, and a threaded portion T is formed by rolling means B1 and B2 at least on the tip end side of the nail blank 1.

  According to a fourth aspect of the present invention, in the method for manufacturing a nail according to the third aspect, the cutting of the metal wire 10 by the cutting device 8 is performed by sandwiching the metal wire 10 from both sides by a pair of tooth bodies 8a and 8a. It is characterized by that.

  According to a fifth aspect of the present invention, in the method for manufacturing a nail according to the third or fourth aspect, the pair of dies 4a and 4a has a semicircular groove 20 having a semicircular cross section for holding the metal wire 10 at the center of the tip surface. And a recess 21 for forming a nail head that is at one end of the groove 20 and is shaped like a half of an inverted truncated cone, and sandwiches the metal wire 10 from both sides with both dies 4a and 4a, The nail head 1a is formed by the striking action of the punch 5.

  Claim 6 is the method of manufacturing a nail according to any one of claims 3 to 5, wherein the rolling means B1 includes a fixed side plate 14a having a facing process of peaks M and valleys V on the opposing surfaces, respectively. It consists of a pair of screw forming plates 14a and 14b with a movable side plate 14b. The nail blank 1 is sandwiched from both sides by both plates 14a and 14b, and the movable side plate 14b is slid with respect to the fixed side plate 14a. Thus, the screw portion T is formed in the nail blank 1 by the weights M and V of both the plates 14a and 14b.

  A seventh aspect of the present invention is the method for manufacturing a nail according to any one of the third to fifth aspects, wherein the rolling means B2 rotates with a fixed segment 32a having a facing surface of peaks M and valleys V on the opposite surfaces. The nail blank 1 is sandwiched from both sides by the fixed segment 32a and the rotating roller 32b, and the rotating roller 32b is rotated with respect to the fixed segment 32a, whereby the basis weight of the fixed segment 32a and the rotating roller 32b is formed. The thread part T is formed in the nail blank 1 by a part.

  Claim 8 is the method for manufacturing a nail according to any one of claims 3 to 7, wherein the nail blank 1 is formed with the threaded portion T by the rolling means B1 and B2, and the nail is quenched and tempered, plated and colored. It is characterized by performing a surface treatment such as painting.

  The effect of the invention by the above-described solution means will be described with reference numerals of embodiments described later. According to the nail N of the invention according to claim 1, when driven into wood, it is the same as a conventional screwless nail. In addition, the nail head 1a can be driven by hitting it with a hammer or the like, and the nail N once driven is driven by engaging a rotary tool such as an electric screwdriver with the nail turning recess 1c of the nail head 1a. By rotating in the opposite direction to the time, it can be easily extracted.

  According to the nail N of the invention according to claim 2, the thread m and the thread valley v of the screw portion T formed on the nail N are respectively perpendicular to the gently descending inclined surface 29 and the axis G. Since it consists of the inclined surface 30 close | similar to a surface, when hitting the nail head 1a of the nail N with a hammer etc. and driving it into wood, there is little driving resistance and it can drive in easily like a normal nail.

  In the manufacturing method according to the third aspect of the present invention, the tip end side of the metal wire 10 is sandwiched between the dies 4a and 4a on the front side of the cutting position S1, and the tip end of the metal wire 10 is located on the front side of the cutting position S1. Then, the nail head 1a is formed on the tip of the metal wire 10 by hitting the tip 5 with a nail and the punch 5 provided with the recess forming protrusion 5a. At the same time, the nail is turned on the end surface of the nail head 1a. After forming the metal wire 10 and feeding the metal wire 10 by a predetermined length, the metal wire 10 is cut by the cutting device 8 at the cutting position S1, and the cut end 1b is formed into a pointed shape to form the nail blank 1, and this nail is formed. The thread part T is formed in the blank 1 by the rolling means B1 or B2, and since the number of processes is small and the generation of the end material at the time of cutting is small, the nail N can be manufactured efficiently in a short time. Can be provided at low cost.

  According to the fourth aspect of the invention, the cutting of the metal wire 10 by the cutting device 8 is performed in such a manner that the metal wire 10 is sandwiched and squeezed from both sides by the pair of tooth bodies 8a, 8a. It is possible to effectively perform the cutting and the forming process of the pointed shape of the cut end.

  According to the fifth aspect of the present invention, the pair of dies 4a and 4a each have a semicircular groove 20 at the center of the tip surface and a half of the inverted truncated cone shape at one end of the groove 20. A nail head forming recess 21 having a shape like this, the metal wire 10 is sandwiched from both sides with both dies 4a, 4a, and the nail head 1a is formed by the striking action of the punch 5, Since the die 4a itself has a function of holding the metal wire 10 and a function of forming the nail head 1a, the equipment of the die device 4 can be simplified and the nail head 1a can be accurately formed.

  According to the sixth aspect of the present invention, the rolling means B1 includes a pair of screw forming plates 14a, which are a fixed side plate 14a and a movable side plate 14b, each having a chamfering process for peaks M and valleys V on the opposing surfaces. 14b, the nail blank 1 is sandwiched from both sides by both plates 14a, 14b, and the movable side plate 14b is slid with respect to the fixed side plate 14a. Since the threaded portion T is formed in 1, the threading of the nail blank 1 can be performed effectively with simple equipment.

  According to the seventh aspect of the present invention, the rolling means B2 is composed of the fixed segment 32a and the rotating roller 32b each having the surface of the mountain M and the valley V applied to the opposing surface, and rotates with the fixed segment 32a. Since the nail blank 1 is sandwiched from both sides with the roller 32b and the rotating roller 32b is rotated with respect to the fixed segment 32a, the threaded portion T is formed in the nail blank 1 at the basis weight of the fixed segment 32a and the rotating roller 32b. The screw processing for the nail blank 1 can be effectively performed with simple equipment.

  According to the invention of claim 8, by applying quenching and tempering treatment to the nail in which the screw portion T is formed, the conventional nail is combined with the spiral effect of the screw portion T attached to the main body shaft portion 1o. Compared with this, the shearing force and pulling-out strength against wood can be remarkably improved, thereby improving the seismic (seismic isolation) performance and preventing the ringing of the floor, which is suitable for a wooden house with excellent safety. Further, the nail N can be provided with corrosion resistance by plating. In addition, after the plating process is performed, the size of the nail N with the threaded portion T can be easily identified at the time of the performance guarantee inspection at the time of completion of the house by applying a colored coating for each size. Even if the rain leaks later, in order to prevent the elution of iron ions from the nail N, it is possible to solve the problem that the tannin and other organic substances contained in the wood react with the eluted iron ions and the wood turns black.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a method for manufacturing a nail according to the present invention, in which 10 is wound around a drum D in a coil shape. This is a metal wire for forming a nail. The metal wire 10 fed out from the drum D is passed through the straightening device 6 to be corrected from a curved shape to a straight shape, and intermittently fed by the wire sending device 7 to the cutting position S1. To do. A cutting device 8 equipped with a pair of tooth bodies 8a, 8a is provided at the cutting position S1, and a die device 4 comprising a pair of openable and closable dies 4a, 4a holding the metal wire 10 on the front side of the cutting position S1. And a punching device 9 is provided at the tip of the cutting position S1. This punching device 9 is provided with a punch 5 which is provided with a protrusion 5a for forming a recess by turning a nail at the tip, and moves forward and backward with respect to the cutting position S1.

  By holding the tip side of the metal wire 10 fed to the cutting position S1 between the pair of dies 4a, 4a before the cutting position S1, and hitting the tip of the metal wire 10 with the punch 5 of the punching device 9 in this state. The nail head 1a is formed at the tip of the metal wire 10, and at the same time, the nail turning recess 1c is formed on the end surface of the nail head 1a. At the same time, the cutting end 8b is cut into a pointed shape such as a quadrangular pyramid or a cone, and the nail blank 1 is thereby formed. The process of forming the nail blank 1 by the dicing device 4, the correction device 6, the wire sending device 7 and the punching device 9 is referred to as a nail making process A (see FIG. 1).

  In the rolling process B as schematically shown in FIG. 1, a threaded portion T is formed at least on the tip 1b side of the nail blank 1 formed in this way, and finally shown in FIGS. 12 (a) to (d). Nail N like this.

  The above manufacturing method will be described in more detail. FIGS. 2A to 2D show the nail making process A in detail, and FIG. 2A shows the first process of the nail making process A. The pair of tooth bodies 8a, 8a that can be opened and closed is configured to move from the open state, thereby sandwiching and cutting the metal wire 10 from both sides. This cutting is performed by sandwiching the metal wire 10 from both sides with both tooth bodies 8a, 8a and drawing it out, in order to form the tip 1b of the nail blank 1 and to install the head 1a of the next nail blank 1. As a preparation for this, cutting is performed simultaneously with the formation of the end face 10a of the metal wire 10 (see FIG. 5B).

  Subsequently, both tooth bodies 8a, 8a are moved to move to the second step as shown in FIG. 2 (b), and both dies 4a, 4a of the die apparatus 4 connect the metal wire 10 before the cutting position S1. As shown in FIG. 2 (a), the remaining cutting portion 10b of the metal wire 10 protruding from the front end surfaces of both dies 4a and 4a is struck once by the punch 5 that moves forward to the cutting position S1. By doing (punching), the nail head 1a is formed. Next, both dies 4a and 4a of the die device 4 are moved to move to the third step shown in FIG. 2 (c). Here, a metal having a nail head 1a formed at the tip as the punch 5 moves backward. The wire 10 is sent by the wire sending device 7 for a predetermined length.

  Then, in the fourth step shown in FIG. 2 (d), the tooth bodies 8a, 8a of the cutting device 8 are closed to cut the metal wire 10, and the nail blank 1 as shown in FIG. As fall. At the time of this cutting, the chips generated during the formation of the nail head 1a are mixed, so it is necessary to separate the nail blank 1 and the chips in the polishing nail process after the nail making process.

  The nail blank 1 made in the nail making process A as described above is threaded in the rolling process B. FIGS. 3A to 3D show the rolling process B in detail. FIG. 3A shows the first process of the rolling process B. The nail blank 1 is fed from the tip of the blank supply guide 12. It is pushed out by the arrow 13 and inserted between the pair of screw forming plates 14a, 14b arranged in parallel in a state perpendicular to the plate. Both screw forming plates 14a and 14b are each provided with a weighting process on the opposing surfaces, one plate 14a being a fixed side plate and the other plate 14b being a movable side plate, the first plate shown in FIG. In the process, the main body shaft portion 1o of the nail blank 1 is sandwiched at a position where the movable side plate 14b is retracted to the maximum with respect to the fixed side plate 14a.

Next, at the same time as the feed arrow 13 moves backward, the process proceeds to the second step shown in FIG. 3 (b). As the movable side plate 14b starts to move forward, the nail blank 1 is moved in synchronism with the two plates 14a. , 14b, moving forward. While the nail blank 1 is rotating and advancing, a threaded portion T, which will be described later, applied to the opposing surfaces of both plates 14a and 14b is transferred to the main shaft 1o of the nail blank 1 to form a thread portion T. To do. Thus, the nail blank 1 is moved to the end of the stationary plate 14a while rotating as shown in FIG. 3 (c), thereby forming a nail N having a threaded portion T formed on the main body shaft portion 1o. As shown in d), it is discharged from the end of the fixed side plate 14a. After the nail N is released, the movable side plate 14b moves backward, and (a) in FIG.
Return to the original position shown in.

  In FIG. 1 schematically showing the rolling process B, reference numeral 15 denotes a hopper for storing the nail blank 1, and 16 denotes a parts feeder for supplying the nail blank 1 in the hopper 15 one by one between the screw forming plates 14a and 14b. .

  The nail N formed by the nail making process A and the rolling process B described above is subjected to heat treatment such as quenching and tempering, surface treatment such as plating and coloring coating, etc., or after heat treatment and surface treatment. Then, it is manufactured by connecting in a coil shape or a stick shape with a connecting material such as a resin, a sheet, and a wire.

  4 (a) to (d) show details of each tooth body 8a of the cutting device 8, (a) is a front view seen from the tip side, (b) is a plan view, and (c) is a plan view. (a) XX sectional drawing, (d) is a side view. This tooth body 8a is formed with a sharp cutting tooth 17 extending in the horizontal direction for cutting the nail head 1a side of the metal wire 10 at the upper end of the tip surface. A V-shaped valley-like nail-end concave portion 19 having a line 18 perpendicular to the cutting teeth 17 at the center O of the head-side cutting teeth 17 is formed by a pair of left and right triangular valley surfaces 20 and 20. ing.

  Thus, when the tip surfaces of both teeth 8a, 8a are butt-joined as shown in FIG. 5 (b), a quadrangular pyramidal space portion is formed between the nail tip side recesses 19, 19 of both teeth 8a, 8a. The tip end portion 1b of the nail blank 1 is formed in a quadrangular pyramid shape (pointed shape) by the quadrangular pyramidal space portion. As can be seen from FIG. 4C, the nail head side cutting teeth 17 and both side edges 19a, 19a of the nail tip side concave portion 19 form a cutting edge along the same plane.

  The tooth bodies 8a, 8a of the cutting device 8 bite into the metal wire 10 while the nail head-side cutting teeth 17 and the side edges 19a, 19a of the nail tip-side recess 19 are simultaneously in contact with the metal wire 10 during the cutting operation. At the end point, the end surfaces of both tooth bodies 8a are joined. In this cutting device 8, before the start of cutting, as shown in FIG. 5 (a), both tooth bodies 8a, 8a are in an open state, and the metal wire 10 is sent between them. The bodies 8a and 8a are closed so that the end faces approach each other, and the metal wire 10 is sandwiched from both sides as shown in FIG.

  When both the tooth bodies 8a and 8a of the cutting device 8 which has finished cutting the metal wire 10 as shown in FIG. 5B are opened, both dies 4a of the die device 4 as shown in FIG. 2B. , 4a are closed, the front end side of the metal wire 10 is sandwiched in front of the cutting position S1, and the front end of the metal wire 10 is blown with the punch 5 of the punching device 9 in this state (one step). At the same time that the nail head 1a is formed on the tip of the metal wire 10, a nail turning recess 1c is formed on the end surface of the nail head 1a.

  In this case, as shown in FIGS. 6A to 6C, each die 4a has a semicircular groove 20 for holding the metal wire 10 at the center of the tip surface, and the groove 20 The nail head forming recess 21 is formed in one end of the nail head and is shaped like a half of the inverted truncated cone. The nail head forming recess 21 is formed in the other end of the groove 20 and has a smaller diameter. And a plurality of indentations 23 on the inner peripheral surface of the groove portion 20 that exhibit a non-slip effect when the metal wire 10 is sandwiched and strengthen the sandwiching effect in the axial direction of the groove portion 20. It is formed in the circumferential direction at regular intervals.

  In order to form the nail head 1a, the metal wire 10 is sandwiched between the dies 4a and 4a in a state where the metal wire 10 is projected from the tip of the die 4a as shown in FIG. The projecting portion 10b is punched with a punch 5 having a quadrangular pyramid or hexagonal pyramid nail turning recess forming projection 5a provided at the tip, and the projecting portion 10b is flattened while being recessed at the center of the end surface. A truncated cone-shaped nail head 1a is formed, in which a nail turning recess 1c such as a quadrangle, a hexagon, or a cross is formed.

  As can be seen from FIGS. 7A to 7C, the punch 5 has a disk-shaped protrusion 24 protruding from the center of the tip surface, and has a quadrangular or hexagonal pyramid shape on the protrusion 24. The nail turning recess forming projection 5a is formed concentrically. (a) is an end view of the punch 5 provided with a hexagonal pyramid-shaped nail turning recess forming projection 5a, (b) is a side view, and (c) is provided with a quadrangular pyramid nail turning recess forming projection 5a. FIG. 6 is an end view of the punch 5.

The rolling means B1 for forming the threaded portion T on the nail blank 1 processed as described above is shown in FIG.
As shown in FIG. 1, the plate is formed of a pair of screw forming plates 14a and 14b, which are a fixed side plate 14a and a movable side plate 14b, each having a chamfering process of crests M and troughs V on the opposite surfaces. As shown in b), patterns of peaks M and valleys V having a predetermined pitch P and angle θ are alternately formed on the lower half of each of the side surfaces facing each other on each screw forming plate 14a, 14b. The nail blank 1 sandwiched between the fixed side plate 14a and the movable side plate 14b advances while rotating on the side surface of the fixed side plate 14a, so that a screw is formed on the main body shaft side of the nail blank 1. A spiral pattern composed of peaks M and valleys V on the side of the plates 14a and 14b is transferred to form a threaded portion T consisting of peaks m and valleys v (see FIG. 9). According to this rolling means B1, it is possible to effectively perform screw machining on the nail blank 1 with simple equipment.

  The shape, pitch, angle, and length of the thread portion T of the thread portion T and the valley portion v of the thread portion T formed on the main body shaft portion 1o of the nail blank 1 are appropriately changed depending on the application and the wire diameter.

  According to the manufacturing method according to the present invention described above, since the number of steps is small and the generation of edge material during cutting is small because of a continuous process, the nail N can be manufactured efficiently and accurately in a short time, A high quality nail N can be provided at low cost.

  A nail N manufactured by this manufacturing method is shown in FIGS. 9A to 9D, where FIG. 9A is an overall side view of the nail N, FIG. 9B is an end view, and FIG. FIG. 5 is a cross-sectional view taken along the line W-W of FIG. 5, and (d) is an enlarged view of a portion indicated by U in (a). As can be seen from (a) and (c), the bottom surface of the nail head 1a of the nail N has a linear shape at a diametrical position corresponding to the joining surface when the pair of dies 4a, 4a of the die device 4 are joined. Are formed on the neck portion, and a notch pattern 26 is formed on the inner peripheral surface of the groove 20 of each die 4a. Further, the nail tip 1b is provided with a scissors 27 and a fracture mark 28 by drawing cutting at positions corresponding to the joint surfaces of the tooth bodies 8a, 8a of the cutting device 8.

  As shown in FIG. 9 (d), the thread m of the threaded portion T formed on the nail N has an inclined surface 29 having a downward slope that is loose toward the tip of the nail with respect to the axis G of the body shaft portion 1o. An inclined surface 30 is formed at the rear end of the gentle down-gradient inclined surface 29 and is close to an orthogonal surface orthogonal to the axis G of the main body shaft portion 1o, and the screw valley v is the gentle down-gradient inclined surface. 29 and an inclined surface 30 formed at the front end thereof and close to the orthogonal surface. Moreover, the crossing angle of both the inclined surfaces 29 and 30 which are each the angle of the thread m and the thread valley v is 80 degrees-90 degrees, for example.

  As described above, the thread m and the thread valley v of the threaded portion T formed on the nail N are each composed of a gently descending inclined surface 29 and an inclined surface 30 close to an orthogonal surface orthogonal to the axis G. Therefore, when the nail N is driven into the wood, the nail head 1a, which is the original driving method of the nail, is hit with a hammer or the like, so that it can be driven easily and easily like a normal nail. By the way, the thread and thread valley of the screw formed on the conventional wood screw are a slope that has a steep downward slope toward the tip of the nail with respect to the axis of the main body shaft, and a rear end of this steeply sloped slope. It is difficult to hit the nail head, which is the original driving method of the nail, with a hammer or the like. If this is the case, there is a risk of damage to the vicinity of the timber driving site or cracking of the plate, and it is necessary to screw the nail while rotating it with an electric screwdriver or the like, which takes time for construction work.

  The pattern of the peaks M and valleys V formed on each of the screw forming plates 14a and 14b is such that the length l of the screw portion T formed on the nail blank 1 is the length L of the nail blank 1 as shown in FIG. If a plurality of shallow grooves 31 extending in the plate length direction are provided on the upper part of each of the screw forming plates 14a and 14b, the grooves 31 and the peaks M and valleys V Since the nail blank 1 can be sandwiched between the top and bottom by the pattern, the nail blank 1 can be rolled smoothly, and the workability and quality can be improved.

  FIG. 11 shows a rolling means B2 that is different from the rolling means B1. The rolling means B2 is a fixed segment 32a having a chamfering process and a valley (not shown) on the opposing surface. And the rotating roller 32b. The nail blank 1 is sandwiched from both sides by the fixed segment 32a and the rotating roller 32b, and the rotating roller 32b is rotated with respect to the fixed segment 32a. The screw is formed at the basis weight with 32b, and the formed screw is the same as that formed by the previous rolling means B1. In this figure, 12 indicates a blank supply guide, and 13 indicates a feed arrow 13. According to this rolling means B2, it is possible to effectively perform screw machining on the nail blank 1 with simple equipment.

  12 (a) to 12 (d) show various nails N having different sizes manufactured by the above-described method of the present invention. FIG. 12 (a) shows a threaded portion T formed on the entire length of the main body shaft portion 1o. A short nail N is shown, and (b) shows a slightly long nail N having a threaded portion T formed on the front half of the main body shaft portion 1o. (C) shows a relatively long nail N having a threaded portion T formed on the tip end side of the main body shaft portion 1o, and (d) shows a long nail N having a screw portion T on the front end portion side of the main body shaft portion 1o. . Further, in the nail N shown in (a) and (b), a hexagonal nail turning recess 1c is formed on the end face of the nail head 1a. In the nail N shown in (c) and (d), the nail head 1a is formed. A rectangular nail turning recess 1c is formed on the end face of the.

  The nail N with the threaded portion T according to the present invention can be driven by hitting the nail head 1a with a hammer or the like in the same manner as a conventional screwless nail when driving into wood. The nail N once driven can be easily and easily removed by engaging a rotary tool such as an electric screwdriver with the nail turning recess 1c of the nail head 1a and rotating the nail N in the direction opposite to the driving time. .

  The nail N is subjected to quenching and tempering heat treatments, and therefore, due to a synergistic effect with the spiral shape of the threaded portion T attached to the main body shaft portion 1o, the shearing force and the pulling strength against the wood are significantly improved as compared with the conventional nail. This improves seismic (seismic isolation) performance and prevents floor noise, making it suitable for wooden houses with excellent safety. Further, by applying a plating process to the nail N, it is provided with corrosion resistance. Furthermore, after the nail N is plated, it is possible to easily identify the size of the nail N with the threaded portion T at the time of the performance guarantee inspection at the time of completion of the house by applying a colored coating for each size. In order to prevent the elution of iron ions from the nail N even if rain leaks after construction, the tannin and other organic substances contained in the wood react with the eluted iron ions, causing the wood to turn black Can also be solved.

  As a metal wire used for the nail N according to the present invention, SWCH18A to SWCH40K (carbon steel wire for cold heading: JIS G 3539) are subjected to intermediate annealing treatment when sufficient strength is required depending on the use. However, an aluminum wire, a copper wire, or a hot dipped wire is also applicable.

  In the case of using a hot-dip plated wire, it is necessary to mainly use a metal having a higher ionization tendency than iron in order to provide corrosion resistance. As specific examples, zinc, aluminum, and a Zn-Al alloy containing zinc as a main component and containing aluminum Zn-Al-Sn alloys mainly containing zinc and aluminum and tin, Zn-Al-Mg alloys mainly containing zinc and aluminum and magnesium, and Al-Si alloys mainly containing aluminum and silicon. Moreover, as a hot dip wire, the thing whose thickness of a hot dip layer is 20-70 micrometers is suitable from the surface of corrosion resistance and intensity | strength.

  Further, as the colored paint used when the nail N is painted, an organic solvent containing a binder made of a thermoplastic resin such as an environmentally friendly acrylic resin and a pigment as a colorant is suitable. Thus, such colored coating significantly improves the shearing force / pullout strength and the corrosion resistance of the plating layer, and the size can be easily identified by looking at the color of the nail N that is colored and colored for each size. There are advantages. Moreover, pollution of the global environment can be prevented by using a resin that does not contain chlorine, which is a source of dioxins.

  The nail N according to the present invention is not limited to the type and material of the nail, and the shape and size of the nail head 1a, the cross-sectional shape and length of the main shaft 1o, and the shape and size of the tip 1b are also limited. There is no.

It is explanatory drawing which illustrates roughly the manufacturing method of the nail which concerns on this invention. (a)-(d) is explanatory drawing explaining a nail-making process. (a)-(d) is explanatory drawing explaining a rolling process. It shows each tooth body of the cutting device in detail, (a) is a front view seen from the distal end side, (b) is a plan view, (c) is a sectional view taken along line XX of (a), (d) Is a side view. It shows the open / closed state of both teeth bodies of the cutting device, (a) is an explanatory diagram showing a state where both teeth bodies are open, (b) is an explanatory diagram showing a state where both teeth bodies are closed and the metal wire is cut It is. The dice of the dice apparatus are shown, wherein (a) is a front view seen from the front end side, (b) is a plan view, and (c) is a cross-sectional view taken along line YY of (b). (a) shows the punch of the punching device, (a) is a front view of the punch provided with a hexagonal pyramid-shaped nail turning recess forming projection from the tip side, (b) is a side view, (c) FIG. 3 is a front view of a punch having a quadrangular pyramid-shaped nail turning recess forming projection as viewed from the tip side. (a) is a plan view showing the fixed side plate and the movable side plate of the rolling means, (b) is a cross-sectional view taken along the line ZZ of (a), and (c) is an enlarged cross-sectional view taken along the line KK of (b). FIG. (a) is an overall side view of the manufactured nail, (b) is an end view, (c) is a cross-sectional view taken along the line WW of (a), and (d) is a portion indicated by U in (a). It is an enlarged view. FIG. 10 is a view similar to FIG. 8B showing another example of a screw portion forming plate. It is explanatory drawing which shows schematically other embodiment of a rolling means. (a)-(d) It is a side view which shows the various nail from which the size which concerns on this invention differs. It is a manufacturing process figure of the conventional nail. It is a manufacturing process figure of the conventional screw.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nail blank 1o Main body shaft part 1a Nail head part 1b Nail front-end | tip part 1c Nail rotation recessed part 4 Dice apparatus 4a, 4b Die 5 Punch 5a Nail rotation recessed part formation protrusion 8 Cutting apparatus 8a Tooth body 9 Punching apparatus 10 Metal Line N Nail T Screw part B1, B2 formed on the nail Rolling means 14a, 14b Screw forming plate

Claims (8)

  A nail in which a threaded portion is formed on at least the tip end side of the main body shaft portion, and a nail turning recess is formed on the end surface of the head.   The thread of the threaded portion is adjacent to the sloping surface of the downward sloping surface that is loose toward the tip of the nail with respect to the axis of the main body shaft portion, and the rear end of the sloping downward sloping surface of the main body shaft portion. 2. The nail according to claim 1, wherein the nail is composed of an inclined surface close to an orthogonal surface orthogonal to each other, and the thread valley is formed of the gentle downward inclined surface and an inclined surface adjacent to the front end thereof and close to the orthogonal surface. .   While feeding the metal wire to the cutting position, holding the tip side of the metal wire with a pair of dies on the front side of the cutting position, the tip of the metal wire is on the tip side of the cutting position and on the tip part The nail head is formed at the tip of the metal wire, and at the same time a nail is formed on the end surface of the nail head, and the metal wire is fed by a predetermined length. After that, the metal wire is cut by a cutting device at a cutting position, and the cutting end is formed into a pointed shape to form a nail blank, and a threaded portion is formed by rolling means on at least the tip side of the nail blank. Method of manufacturing nails.   4. The method of manufacturing a nail according to claim 3, wherein the cutting of the metal wire by the cutting device is performed by squeezing from both sides by a pair of tooth bodies.   Each of the pair of dies has a semicircular cross-sectional groove for holding the metal wire at the center of the tip surface, and a nail head shaped like a half of the inverted truncated cone at one end of the groove. The method for manufacturing a nail according to claim 3 or 4, further comprising: a molding recess, wherein a metal wire is sandwiched from both sides by both dies, and a nail head is formed by the punching action of the punch.   The rolling means is composed of a pair of screw forming plates of a fixed side plate and a movable side plate each having a chamfering and trough weighting process on opposite surfaces, and sandwiching a nail blank from both sides by both plates. The method for manufacturing a nail according to any one of claims 3 to 5, wherein the screw portion is formed in the nail blank at the weighting portion of both plates by sliding the sliding side plate with respect to the fixed side plate.   The rolling means is composed of a fixed segment and a rotating roller, each of which has a crest and a valley formed on the opposite surface, and the rotating roller is fixed by sandwiching a nail blank from both sides with the fixed segment and the rotating roller. The method for manufacturing a nail according to any one of claims 3 to 5, wherein a screw portion is formed in the nail blank at the weighted portion of the fixed segment and the rotating roller by rotating with respect to the segment. The method for producing a nail according to any one of claims 3 to 7, wherein the nail formed on the nail blank by rolling means is subjected to a surface treatment such as quenching / tempering treatment, plating, and coloring coating.

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