JP2009063144A - Self-drilling screw, self-drilling anchor, and method of manufacturing self-drilling anchor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-drilling screw capable of not only concluding the prepared hole boring work and the fitting work in one process but also boring with a small force by securing a space for chips which appears when boring the prepared hole so as to reduce resisting force between a drill and the self-drilling screw, and capable of reducing probability of breakout, and further, easy to be manufactured at low costs, and to provide a self-drilling anchor and a method of manufacturing the self-drilling anchor. <P>SOLUTION: This self-drilling screw 1A has a screw shaft part 2 formed with a thread 21 in the peripheral surface thereof, a screw head part 3 provided in a rear end of the screw shaft part 2 so as to be engaged with a rotating tool T, and a plate-like drill part 4 provided in a tip of the screw shaft part 2 and structured of a plate-like elastic member. The plate-like drill part 4 is formed with a boring edge part 41 in a tip thereof, and the maximum width thereof is formed smaller than the outer diameter of the thread 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a screw and an anchor attached to a wall material such as a plaster board, and in particular, a self-drill screw, a self-drill anchor, and a self-drill anchor that complete a drilling operation and an installation operation of a pilot hole in one step. It is about the method.

  Conventionally, a self-drilling screw and a self-drilling anchor that can complete a mounting operation on a wall material or the like in one step have been proposed.

  For example, in Japanese Patent Laid-Open No. 7-305708, a head portion to which a tightening tool is engaged, a screw portion made of a circular shaft having a thread on the outer periphery, and an outer diameter that is substantially equal to the circular shaft are formed. A drill shaft having an outer diameter substantially equal to that of the drill shaft and having a substantially truncated cone shape, and a small diameter drill cone having a smaller drill angle than the large diameter drill cone. A drill screw in which a continuous notch is provided on the outer surface of a large-diameter drill cone portion, a small-diameter drill cone portion, and a drill shaft portion has been proposed (Patent Document 1). .

  According to this Patent Document 1, a small diameter drill cone, a large diameter drill cone, and a drill shaft drill a pilot hole, and then a screw part enters the pilot hole while screwing a screw groove and tightens. It is supposed to be fixed. At this time, by making the drill angle of the small-diameter drill cone smaller than the drill angle of the large-diameter drill cone, the construction plate will bite more easily, and it will be difficult to skid and flutter, making construction easier. And it is supposed to be accurate. Further, since the contact area between both drill cones and the construction plate is small, it is said that even if the construction plate is thick, the thrust is small and the amount of work is also small.

  Japanese Laid-Open Patent Publication No. 10-237958 discloses an insert main body attached to a deck plate, a drill tip that includes a connecting shaft portion that is detachably fitted to the lower end of the insert main body, and drills a pilot hole in the deck plate; The insert body has a seal washer that reliably closes the gap between the lower hole and the insert body. A fixing male screw part that is screwed into the lower hole of the deck plate is provided, a stopper that locks the washer is provided at the upper end of the fixing male screw part, and the connecting shaft part of the drill tip is detachably fitted at the lower end. There has been proposed an insert with a drill that includes a female screw part for connecting a suspension bolt that includes an opening part that extends in the axial direction in the inner part (Patent Document 2).

  According to this patent document 2, an insert with a drill attaches an insert body to a deck plate in one step by drilling a pilot hole in a deck plate and screwing a male screw portion for fixing into the pilot hole. It is supposed to be possible. This insert with a drill is used by removing the drill tip from the insert main body that has been attached and screwing the suspension bolt onto the female thread portion for coupling the suspension bolt.

JP 7-305708 A JP-A-10-237958

  However, in the invention described in Patent Document 1, chips generated during drilling of the lower hole are sandwiched between the screw thread at the time of screwing and the lower hole to generate a resistance force and prevent the screw from entering. There is a problem. Furthermore, the screw thread screwed into the pilot hole may be damaged by the resistance force, or the head of the drill screw may be damaged. Therefore, when a resistance force is felt during construction, the screw must be removed once to remove chips in the prepared hole, which may cause a reduction in work efficiency.

  Moreover, in the invention described in Patent Document 2, there is a problem that the connecting shaft portion and the opening portion of the drill tip require high-precision processing, and the manufacturing cost increases. Because, when the accuracy is low and the dimensional tolerance at the time of manufacturing is large, the outer diameter of the connecting shaft is manufactured on the minus side of the tolerance, and the inner circumference of the opening is manufactured on the plus side of the tolerance, This is because a gap is formed and the drill tip easily falls off. On the other hand, when the dimension of the connecting shaft portion is on the plus side of the tolerance and the size of the opening portion is on the minus side, it is difficult to fit the two.

  The present invention has been made in order to solve such a problem. In addition to being able to complete the drilling operation and mounting operation of the pilot hole in one step, the space for chips generated when drilling the pilot hole is provided. Self-drilling screw, self-drilling, which can reduce the resistance force generated between the drill and drill with a small force, reduce the probability of breakage, and can be manufactured easily and inexpensively It aims at providing the manufacturing method of a drill anchor and a self-drill anchor.

  The self-drilling screw according to the present invention is characterized by a screw shaft portion having a thread formed on the outer peripheral surface, a screw head portion provided at the rear end of the screw shaft portion to which a rotary tool is engaged, and the screw shaft portion. A plate-shaped drill portion formed by a plate-shaped elastic member, and the plate-shaped drill portion has a sword tip for drilling at the tip, and the maximum width is the screw The width is smaller than the outer diameter of the mountain.

  In the present invention, a drill connecting shaft for connecting the plate drill portion is formed at a tip of the screw shaft portion, and a rear end of the plate drill portion is directed toward a sword tip. The drill connection frame is composed of a plurality of plate-like elastic frame pieces that are alternately expanded in the plane outward direction one side at a time and are formed in a shape and size into which the drill connection shaft can be inserted. preferable.

  The self-drill anchor according to the present invention is characterized by having a screw shaft portion having a thread on the outer peripheral surface, a drill connecting shaft at the tip of the screw shaft portion, and a rotary tool at the rear end. An anchor main body having a screw head to be joined, and a flexible cylindrical plug formed in a cylindrical shape capable of accommodating the screw shaft portion and formed with a plurality of slits along the axial direction A flexible cylindrical plug having a main body, and having a screwing portion screwed along the screw shaft portion at the tip of the cylindrical plug main body, and a flange portion at the rear end; and a plate-like shape Formed by an elastic member, having a sword tip for drilling at the tip thereof, and a shape that is expanded in the plane outward direction alternately one side toward the tip of the sword, and can be fitted with the drill connecting shaft And multiple formed in size In that it includes a plate-like drill having a drill connecting frame consisting Jo elastic member.

  Further, the manufacturing method of the self-drill anchor according to the present invention is characterized in that the drill connecting shaft of the anchor body is inserted from the flange portion side of the flexible tubular plug, and the screwing portion is connected to the tip of the screw shaft portion. It arrange | positions in the side, and it exists in the point which inserts and connects the drill connection axis | shaft of the said anchor main body to the drill connection frame of the said plate-shaped drill after that.

  According to the present invention, the drilling work and mounting work of the pilot hole can be completed in one step, and the resistance force generated between the drill and the drill is reduced by securing the space for chips generated when drilling the pilot hole. Thus, it is possible to provide a self-drilling screw, a self-drill anchor, and a method for manufacturing a self-drill anchor that can be drilled with a small force, reduce the probability of breakage, and can be manufactured easily and inexpensively. .

  Hereinafter, a first embodiment of a self-drilling screw according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of a self-drilling screw 1A according to the first embodiment. Note that the self-drilling screw 1A in the first embodiment is for fastening the article to be fastened O to the wall material W.

  The self-drilling screw 1A of the first embodiment mainly includes a screw shaft portion 2, a screw head 3 provided at the rear end of the screw shaft portion 2, and a plate drill provided at the tip of the screw shaft portion 2. Part 4. Hereinafter, each component will be described in more detail.

  The screw shaft portion 2 is for screwing with the wall material W, and a screw thread 21 is formed on the outer peripheral surface thereof. Further, a drill connecting shaft 22 that is connected to a drill connecting frame 42 of the plate-like drill portion 4 is formed at the tip of the screw shaft portion 2. The drill connecting shaft 22 in the first embodiment is formed in a substantially square cross section.

  The screw head 3 is for transmitting the rotational force and thrust obtained from the fastening tool T to the screw shaft portion 2 and the plate-like drill portion 4, and is provided at the rear end of the screw shaft portion 2, and is a fastening tool. It has the engaging part 31 for T to be engaged. As shown in FIG. 5, the screw head 3 in the first embodiment is formed in a substantially hemispherical shape in order to enhance the fastening effect of the fastened object O, and a groove for fitting a plus driver or the like is formed at the rear end. Has been. The shape of the screw head 3 is not limited to this, and is appropriately selected according to the application and the fastening tool T to be used. For example, the screw head 3 is formed in a hexagonal shape in cross section and fastened with a hexagon wrench. May be.

  In addition, in this 1st Embodiment, although the screw shaft part 2 and the screw head 3 are normally formed by integral molding using a steel raw material, it is not limited to this, Stainless steel is used according to a use. May be selected from magnesium, titanium, aluminum, brass, resin, and the like. Further, the manufacturing and processing method may be appropriately selected from forging and cutting, rolling, casting, forging, welding, and the like.

  The plate-like drill portion 4 is for receiving the rotational force and thrust from the screw shaft portion 2 and drilling the prepared hole H in the wall material W. In the first embodiment, the plate-like drill portion 4 is formed by a thin plate-like plate-like elastic member in order to secure a large space for storing chips generated during drilling. Moreover, the maximum width is formed smaller than the outer diameter of the thread so that the inner diameter of the pilot hole H does not become too large. Further, as shown in FIG. 2, a sword tip 41 for drilling is provided at the tip, and a drill connection frame 42 connected to the drill connection shaft 22 is provided at the rear end.

  The sword tip portion 41 is formed into a blade shape by sharpening the center of the tip like a sword tip and cutting the acute angle surface 41a obliquely. As a result, the frictional resistance generated when the wall material W is drilled is reduced, and since the drill is deeply drilled in the wall material W, the drill is prevented from skidding or fluttering at the start of drilling.

  Further, the drill connection frame 42 plays a role of receiving the rotational force and the thrust force by inserting and connecting the drill connection shaft 22. In the first embodiment, the drill coupling frame 42 is formed by elastic plate-like elastic frame pieces 42a, 42a, 42a, and the plate-like elastic frame pieces 42a, 42a, 42a are alternately directed toward the sword tip direction. Each side is expanded in the plane outward direction, and is formed in a shape and size into which the drill connecting shaft 22 can be fitted. Since the plate-like elastic frame piece 42a is formed in a frame shape with a plate-like elastic member, it can absorb a dimensional error when connecting to the drill connecting shaft 22 and exhibit a drilling function.

  Specifically, as shown in FIGS. 2 and 3, each plate-like elastic frame piece 42a, 42a, 42a has a “substantially letter-shaped” shape when viewed from the rear end side toward the front end side. As shown in FIG. 1, the drill connecting shafts 22 are arranged so as to be alternately sandwiched from both sides of the plate-like drill portion 4. The plate-like elastic frame pieces 42a, 42a, 42a in the first embodiment are formed with three slits on the side surface of the plate-like drill portion 3, and are alternately bent outward from one side surface from the rear end side. And is formed in a substantially square shape that is the same shape as the cross-sectional shape of the drill connecting shaft 22.

  Thereby, when the drill connection shaft 22 is inserted in the drill connection frame 42, both rotate integrally without rotating freely. Further, by arranging the three plate-like elastic frame pieces 42a, 42a, 42a alternately, the drill connecting shaft 22 is connected without swinging in order to support the balance in a balanced manner. Furthermore, since the drill connection shaft 22 and the drill connection frame 42 in the first embodiment are merely fitted, they can be attached and detached, and the drill can be replaced with a desired shape.

  In addition, the drill connection frame 42 in the first embodiment forms cuts of the same length at substantially equal intervals in the sword tip direction at the rear end of the plate-like drill portion 4 formed by the plate-like elastic member. After making it easy to expand, it is formed by pressing with a die having a concavo-convex portion that can be expanded in substantially the same shape as the cross-sectional shape of the drill connecting shaft 22. Thereby, since it can process easily and in large quantities, manufacturing cost can be suppressed. However, the formation method of the plate-shaped drill part 4 is not restricted to this, For example, you may form integrally by casting etc., and the drill connection frame 42 may be welded to the plate-shaped drill part 4. FIG.

  Further, the cross-sectional shape of the drill connecting shaft 22 and the expanded shape of the drill connecting frame 42 are not limited to the above-described substantially square shape, and may be a shape that allows the drill connecting shaft 22 to be rotated integrally without spinning. That's fine. For example, in addition to a polygonal shape having corners, the cross section may be elliptical if the ratio of the major axis to the minor axis is increased to some extent. Further, the drill cannot be replaced, but after fitting the drill connecting shaft 22 and the drill connecting frame 42, they may be swaged and fixed, and the tip of the screw shaft portion 2 is pressed to form a plate shape. The drill portion 4 may be molded.

  It continues and demonstrates the effect | action of the self-drilling screw 1A in this 1st Embodiment using drawing. FIG. 4 and FIG. 5 show schematic views when the object to be fastened O is fastened to the wall material W using the self-drilling screw 1A in the first embodiment.

  In the first embodiment, the wall material W is a plaster board. In addition, the fastening object O is formed with a fastening hole P having an appropriate size.

  First, the object to be fastened O is installed on the front side of the wall material W, the self-drilling screw 1A is inserted into the fastening hole P of the fastened object O, the sword tip 41 is applied to the wall material W, and tightened by the fastening tool T.

  When the fastening tool T is tightened, the plate-like drill portion 4 drills a pilot hole H in the wall material W by rotational force and propulsive force. At this time, since the sharp point at the center of the tip of the sword tip 41 is caught by making a small hole in the wall material W, side slip and fluttering at the start of drilling are suppressed. In addition, since the rotational force and the propulsive force are concentrated on the sharp-edged blade tip 41 and the contact area between the blade tip 41 and the wall material W is narrow, the frictional resistance is reduced. Can drill.

  Moreover, since the plate-shaped drill part 4 is formed in a thin plate shape and has a large space between the lower hole, the chips prevent the drilling by storing the chips at the time of drilling in this space. Is suppressed. Moreover, since the plate-shaped drill part 4 is formed of a plate-shaped elastic member, even if a large load is applied during drilling, the elastic force can prevent damage.

  The drill connecting shaft 22 and the drill connecting frame 42 have a substantially square cross section and are fitted with almost no gaps, so that the rotational force is transmitted without spinning. In addition, the drill connecting frame 42 has a plurality of plate-like elastic frame pieces 42a arranged alternately in the sword tip direction, and the drill connecting shaft 22 is held from both sides to suppress the plate-like drill portion 4 from swinging. ing.

  In addition, in this 1st Embodiment, when connecting the plate-shaped drill part 4 and the screw shaft part 2, it drills to each plate-shaped elastic frame piece 42a, 42a, 42a of the drill connection frame 42, as shown in FIG. The connecting shaft 22 is fitted so as to be sewn. Therefore, the drill connecting frame 42 can absorb the dimension error at the time of manufacture of the drill connecting shaft 22 and the drill connecting frame 42 by its elasticity, and can be easily connected. Furthermore, both are detachable, and the drill can be exchanged to a desired shape.

  Following the plate-like drill portion 4, the screw shaft portion 2 is screwed by a screw thread 21. In the first embodiment, since the width of the plate-like drill portion 4 is formed substantially the same as the outer diameter of the screw shaft portion 2, the lower hole H is formed substantially the same as the outer diameter of the screw shaft portion 2. The screw shaft portion 2 can be screwed straight into the lower hole H.

  Then, when the plate-like drill portion 4 reaches the back side of the wall material W, chips accumulated in the space between the plate-like drill portion 4 and the lower hole H are discharged to the back side of the wall material W.

According to the first embodiment as described above, the following effects can be obtained.
1. It is possible to suppress the side-slip and fluttering of the drill at the start of drilling, facilitating installation work.
2. Suppresses increase in frictional resistance due to chips and enables drilling with light force.
3. The plate-like drill portion 4 is strong against a large load by an elastic force and can be hardly damaged.
4). The structure of the drill coupling frame 42 absorbs a dimensional error with the screw shaft portion 2 and smoothly transmits the rotational force.
5). The plate-shaped drill part 4 can be replaced | exchanged according to a use.

  Next, a self-drill anchor will be described as a second embodiment of the present invention with reference to the drawings. Note that, in the self-drilling anchor 1B in the second embodiment, the same or corresponding components as those of the self-drilling screw 1A in the first embodiment described above are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 7, the self-drill anchor 1 </ b> B according to the second embodiment includes an anchor body 5, a flexible cylindrical plug 6, a plate-shaped drill 4, and a common rotation prevention plate 7.

  As shown in FIG. 8, the anchor body 5 includes a screw shaft portion 2, a screw head portion 3, and a drill connection shaft 22. However, the thread 21 of the screw shaft portion 2 in the second embodiment is for screwing with a screwing portion 62 of the flexible cylindrical plug 6 described later.

  The flexible cylindrical plug 6 is for expanding the back of the wall material W and exerts a fastening force with the wall material W. As shown in FIG. The screw part 62 is formed at the front end of the cylindrical plug body 61 and the flange part 63 is formed at the rear end of the cylindrical plug body 61.

  The cylindrical plug body 61 is formed in a cylindrical shape into which the screw shaft portion 2 can be inserted by a flexible material, and a plurality of slits 64 are formed along the axial direction between the front end and the rear end. Yes. As shown in FIG. 10, the slits 64 of the second embodiment are formed at three locations at equal intervals of 120 °.

  The screwing part 62 is provided at the tip of the cylindrical plug body 61 and is used for screwing along the screw shaft part 2. In the second embodiment, the screwing portion 62 is formed in a hole having substantially the same inner diameter as the outer diameter of the screw shaft portion 2, and is screwed with the screw thread 21 due to its flexible property. It can be screwed by rotating. A female screw that can be screwed with the screw thread 21 of the screw shaft portion 2 may be screwed on the inner surface of the screwing portion 62.

  The flange portion 63 engages with the outer surface of the article to be fastened O to prevent the hole from being removed, and also serves to prevent the cylindrical plug body 61 from rotating together, and at least has a larger diameter than the fastening hole P. Is formed.

  The plate drill 4 of the self-drill anchor 1B has a maximum width equal to or greater than the outer diameter of the cylindrical plug body 61 and larger than the outer diameter of the flange portion 63 so that the inner diameter of the pilot hole H does not become too large. It is formed with small dimensions. In the second embodiment, the maximum width of the plate drill 4 is formed substantially the same as the outer diameter of the tubular plug body 61.

  The co-rotation prevention plate 7 prevents the cylindrical plug body 61 from co-rotating with the anchor body 5 when the anchor body 5 is rotated and expanded while the screwing portion 62 is screwed. The co-rotation prevention plate 7 is formed of a flexible material, and is formed in a blade shape around the cylindrical plug body 61. The co-rotation prevention plate 7 in the second embodiment is formed in a substantially triangular shape, and one sheet is provided between the slits 64 along the axial direction.

  It continues and demonstrates the manufacturing method of the self drill anchor 1B in this 2nd Embodiment using drawing. FIG. 11 and FIG. 12 are schematic views showing respective steps relating to the manufacturing method of the self-drill anchor 1B in the second embodiment.

  The manufacturing method of the self-drill anchor 1B in the second embodiment includes step 1 of inserting the drill connecting shaft 22 of the anchor main body 5 from the flange portion 63 side of the flexible tubular plug 6, and the screwing portion 62 as the screw shaft. Step 2 is arranged on the distal end side of the part 2 and Step 3 is made by inserting the drill connection shaft 22 of the anchor body 5 into the drill connection frame 42 of the plate-like drill 4 and connecting them.

  Hereinafter, each step regarding the manufacturing method of the self-drill anchor 1B will be described in more detail.

  In step 1, as shown in FIG. 11, the drill connecting shaft 22 of the anchor body 5 is inserted from the flange 63 side of the flexible tubular plug 6. For this reason, when attaching the flexible cylindrical plug 6, the wide plate-shaped drill 4 does not become obstructive and can be assembled easily.

  In step 2, as shown in FIG. 12, the drill connecting shaft 22 is passed through the screwing portion 62, and the screwing portion 62 is rotatably disposed in the vicinity of the screw thread 21 on the tip end side of the screw shaft portion 2. Further, a gap is formed between the flange portion 63 and the screw head 3, but when the anchor body 5 is screwed, it is pushed in, and the screwing portion 62 is screwed into the screw thread 21 to start screwing. To come. In addition, when the internal thread is previously formed in the screwing part 62, you may make it screw with the screw shaft part 2 previously. In this case, the screwing part 62 can be easily screwed by the co-rotation preventing force generated by the flange part 63 coming into contact with the fastened object O.

  In step 3, as shown in FIG. 6, the drill connection frames 42 of the plate-shaped drill 4 are alternately arranged in the sword tip direction, so that the drill connection shaft 22 of the anchor body 5 is sewn with respect to the drill connection frame 42. So that they are connected. Thereby, it is easy to absorb the dimensional error of the drill connection frame 42 and the drill connection shaft 22, and can be assembled easily.

  It continues and demonstrates the effect | action of the self drill anchor 1B in this 2nd Embodiment using drawing. FIGS. 13-16 has shown the schematic diagram at the time of attaching the to-be-fastened object O to the wall material W using the self drill anchor 1B in this 2nd Embodiment.

  In the second embodiment, the wall material W is a plaster board. Further, the fastening object O is formed with a fastening hole P that is larger than the outer diameter of the cylindrical plug body 61 and smaller than the flange portion 63.

  First, the fastened object O is installed on the front side of the wall material W, and the self-drill anchor 1B is passed through the fastening hole P of the fastened object O so that the sword tip 41 is brought into contact with the wall material W. Then, when a fastening tool T (not shown) is engaged with the screw head 3 and screwed, the plate-shaped drill 4 drills a lower hole H in the wall material W and penetrates the wall material W (FIG. 13).

  Next, the self-drilling anchor 1B is pushed in as it is, and the flexible tubular plug 6 is passed through the prepared hole H (FIG. 14). Since the lower hole H is drilled by the plate drill 4 so as to be substantially the same as the outer diameter of the cylindrical plug body 61, it can be easily inserted. In addition, since the co-rotation prevention plate 7 exerts a force from three directions toward the central axis during insertion, the flexible cylindrical plug 6 is inserted into the lower hole H at the center. Moreover, since the flexible cylindrical plug 6 and the corotation prevention plate 7 are formed of a flexible material, the lower hole H is not damaged. In the second embodiment, since the screwing portion 62 is rotatably arranged on the tip end side of the screw shaft portion 2, at this stage, the flexible cylindrical plug 6 and the anchor main body 5 are shared. Do not turn.

  Subsequently, as shown in FIG. 15, the screwing portion 62 and the screw thread 21 are screwed together, and the screwing portion 62 is screwed toward the back side of the wall material W along the axis.

  Along with the screwing operation of the screwing part 62, the cylindrical plug main body 61 is formed of a flexible material, and the slit 64 is also formed. The co-rotation prevention plate 7 is engaged with the lower hole H to prevent co-rotation of the flexible cylindrical plug 6 and the anchor body 5.

  The cylindrical plug body 61 exhibits a bending locking force on the back side of the wall material W, and the fastened object O is firmly fastened by the clamping force between the screw head 3 and the cylindrical plug body 61 ( FIG. 16).

According to the second embodiment as described above, the following effects are obtained in addition to the effects of the first embodiment.
1. A fastening force can be obtained without damaging the pilot hole H.
2. By inserting the flexible tubular plug 6 straight into the lower hole H, a strong and reliable fastening force can be obtained.
3. The screwing of the screwing portion 62 and the screw thread 21 can be ensured, and the failure of the fastening operation can be reduced.
4). Manufacturing is easy and manufacturing costs can be reduced.

1 is a front view showing a first embodiment of a self-drilling screw according to the present invention. It is a top view which shows the plate-shaped drill part of this 1st Embodiment. It is a right view which shows the plate-shaped drill part of this 1st Embodiment. It is the schematic diagram which showed the middle course when fastening a to-be-fastened object to a wall material using this 1st Embodiment. It is the schematic diagram which showed the time of fastening the to-be-fastened object to the wall material using this 1st Embodiment. It is a schematic diagram which shows the connection method of a drill connection frame and a drill connection axis | shaft in this 1st Embodiment and this 2nd Embodiment. It is a front view which shows 2nd Embodiment of the self-drill anchor which concerns on this invention. It is a front view which shows the anchor main body of this 2nd Embodiment. It is a front view which shows the flexible cylindrical plug of this 2nd Embodiment. It is the 10A-10A sectional view taken on the line in FIG. It is a schematic diagram which shows step 1 in the manufacturing method of the self drill anchor of this 2nd Embodiment. It is a schematic diagram which shows step 2 in the manufacturing method of the self drill anchor of this 2nd Embodiment. It is the schematic diagram which showed the time of drilling a pilot hole in the wall material using this 2nd Embodiment. It is the schematic diagram which showed the time of inserting this 2nd Embodiment in a pilot hole. It is the schematic diagram which showed the time of fastening a to-be-fastened object to a wall material using this 2nd Embodiment. It is the schematic diagram which showed when the to-be-fastened object was fastened to the wall material using this 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A Self-drill screw 1B Self-drill anchor 2 Screw shaft part 3 Screw head 4 Plate-shaped drill part, plate-shaped drill 5 Anchor main body 6 Flexible cylindrical plug 7 Co-rotation prevention plate 21 Screw thread 22 Drill connection shaft 31 Engagement part 41 Blade tip portion 41a Acute angle surface 42 Drill connection frame 42a Plate-like elastic frame piece 61 Cylindrical plug body 62 Screwing portion 63 Flange portion 64 Slit W Wall material H Lower hole O Fastened object P Fastening port T Fastening tool T Fastening tool T

Claims (4)

A screw shaft portion having a thread formed on the outer peripheral surface;
A screw head provided at the rear end of the screw shaft portion and engaged with the rotary tool;
A plate-like drill portion provided at the tip of the screw shaft portion and configured by a plate-like elastic member;
A self-drilling screw characterized in that the plate-like drill part has a sword tip for drilling at the tip thereof, and has a maximum width smaller than the outer diameter of the thread. In claim 1, a drill connecting shaft for connecting the plate drill portion is formed at the tip of the screw shaft portion,
At the rear end of the plate-shaped drill portion, a plurality of plates that are expanded in the plane outward direction alternately one side at a time toward the sword tip and are formed in a shape and size into which the drill connecting shaft can be fitted. A self-drilling screw characterized in that a drill connecting frame comprising an elastic frame piece is formed. An anchor body having a screw shaft portion with a thread formed on the outer peripheral surface, a drill connecting shaft at the tip of the screw shaft portion, and a screw head with which a rotary tool is engaged at the rear end When,
It has a flexible cylindrical plug body that is formed in a cylindrical shape capable of accommodating the screw shaft portion and has a plurality of slits formed along the axial direction. The screw is attached to the tip of the cylindrical plug body. A flexible cylindrical plug having a screwing portion that is screwed along the shaft portion and a flange portion at the rear end thereof;
Consists of a plate-like elastic member, with a sword tip for drilling at its tip, and at its rear end, it is alternately expanded toward the sword tip direction one side at a time, and the drill connecting shaft can be inserted A self-drill anchor comprising: a plate-like drill having a drill connecting frame made of a plurality of plate-like elastic members formed in various shapes and sizes.   4. The method of manufacturing a self-drill anchor according to claim 3, wherein a drill connecting shaft of the anchor body is inserted from a flange portion side of the flexible tubular plug, and the screwing portion is connected to a tip of the screw shaft portion. A method for manufacturing a self-drill anchor, wherein the drill connecting shaft of the anchor body is inserted into and connected to a drill connecting frame of the plate-like drill.

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