JP4031125B2 - Threaded anchor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a threaded anchor used for reinforcing a base material for fixing various devices or the like to a weak wall base material such as a plaster board with a screw.
[0002]
[Prior art]
When various devices are fixed to a wall surface base material such as a gypsum board, the base material is fragile and does not work even when directly driven by a nail or a screw, so an anchor or a plug for base reinforcement is necessary.
[0003]
The conventional anchor has a structure in which a male screw is provided on the outer periphery of a hollow shaft part having a head at one end and a blade part at the other end. The blade part is cylindrical and cylindrical. A blade with a serrated edge at the tip, a flat plate with a sharp edge at the tip, a sharp circular shaft with a recess for forming the blade edge on the peripheral surface, bent when the mounting screw enters The thing to do is adopted.
[0004]
[Problems to be solved by the invention]
By the way, when the anchor with a cylindrical blade portion is screwed toward the wall surface base material, the cutting waste enters the blade portion during the cutting and is compressed, and this becomes a hard plug state. There is a problem of weakening the fastening force of the anchor to the wall surface base material. In addition, a cylindrical shape with a serrated blade tip at the tip has a small contact area when brought into contact with the wall surface base material, and the blade tip slips at the start of drilling and is not stable, so it is difficult to perform the screwing operation. There's a problem.
[0005]
Furthermore, in the case of a flat plate-like or circular-axis shaped blade part, since the chips of the wall surface base material are discharged toward the outside, the finish after loading the anchor becomes dirty, and the discharge power of the chips is weak, It is easy to break the back side of the wall base material.
[0006]
In addition, when the mounting screw is loaded, in the case of a long screw, the bottom of the hollow shaft portion of the anchor must be broken and the blade portion must be tilted, which causes a problem of weakening the fastening force of the anchor to the wall surface base material.
[0007]
Furthermore, since any of the conventional anchors has an inner diameter set in accordance with the size of the mounting screw, there are very few types of mounting screws that can be used, and when the mounting screw is removed, the anchor is attached together with the screw. Has the disadvantage of falling out.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide a threaded anchor that has a finished surface after loading, provides a strong fastening force, and does not cause co-rotation when the mounting screw is removed.
[0009]
[Means for Solving the Problems]
In order to solve the problems as described above, the present invention provides a male screw on the outer periphery of a hollow shaft portion having a head at one end, and the other end of the hollow shaft portion has an inner diameter that is coaxial with the hollow shaft portion. form connecting a cross section semi-cylindrical blade portion which projects a diameter extension form, previously end outer peripheral surface of the blade portion is formed on the inclined surface whose diameter toward the tip, the tip axis perpendicular cutting edge, and the cutting edges provided on both side edges of the blade portion, the peripheral wall opposite to the position and coupling of the blade portion in the hollow shaft portion, the open end of the peripheral wall of the two extending head side In a threaded anchor in which cuts are provided in parallel and a bendable piece is formed between the cuts, a mounting screw is inserted at a position facing the bendable piece from the inner surface of the hollow shaft portion to the inner surface of the blade portion. A protrusion is provided along the axial direction, and this protrusion starts from a position close to the head on the inner surface of the hollow shaft portion. Becomes inclined upward toward the distal end portion of the song piece, it is obtained by adopting the configuration in which parallel to the axis of the hollow shaft portion at a position corresponding to the tip portion of the bendable pieces.
[0010]
The accepted music piece biting protrusion of the screw attached to the inner surface is provided along the axial direction of the hollow shaft portion, it may be a structure in which the tip of the protrusion is protruded to the outside from the tip edge of the blade .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
As illustrated, the anchor 1 includes a hollow shaft portion 4 having a head 2 at one end and a male screw 3 provided on the outer periphery, and a blade portion 5 coupled to the other end of the hollow shaft portion 4. In order to attach various devices, separate attachment screws 6 screwed into the anchor 1 are used in combination.
[0013]
The hollow shaft portion 4 has a circular taper shape in which the outer peripheral surface has a large diameter from the blade portion 5 side toward the head portion 2 side, and the male screw 3 provided on the outer peripheral surface of the hollow shaft portion 4 is also on the blade portion 5 side. The head 2 has a large diameter toward the head 2 side, and the head 2 has a slightly larger diameter and a thinner structure than the maximum diameter of the male screw 3.
[0014]
A driver engaging groove 7 is formed in a cross shape in the center of the head 2, and a through hole 8 extends from the bottom of the engaging groove 7 in the axial direction through the inside along the axial center of the hollow shaft portion 4. . The through-hole 8 has a cross shape in which the portion of the maximum diameter with respect to the engagement groove 7 has a slightly smaller diameter, and has convex portions 9 at four positions on the inner periphery, and a hollow shaft at the tip of the convex portion 9 group. The arrangement diameter centered on the axis of the portion 4 is set to a dimension that the thread 10 of the mounting screw 6 used in combination with the anchor 1 can bite into.
[0015]
Two cuts 11, 11 extending from the open end of the peripheral wall to the head 2 side are arranged on the peripheral wall of the hollow shaft portion 4 so as to face the coupling side of the blade portion 5 with the shaft center interposed therebetween. 3 is provided in a parallel shape so as to divide a part, and a bendable piece 13 that protrudes outward when pressed by a mounting screw 6 screwed into the hollow shaft portion 4 is provided between the cuts 11 and 11. 1B. As shown in FIG. 1E, the bendable piece 13 has a U-shaped cross-section that forms part of the cross-shaped through-hole 8 on both sides. The biting convex portion 9 is provided so as to be continuous at the same height along the axial direction of the hollow shaft portion 4.
[0016]
The blade portion 5 has a substantially semi-cylindrical shape with a straight section having the same diameter as the lower end of the hollow shaft portion 4, protrudes coaxially with the hollow shaft portion 4, and leaves an open end portion at the end portion of the hollow shaft portion 4. The peripheral edges of the tip and the side edges on both sides are cutting edges 14 and 15.
[0017]
In the anchor 1 having the above-described structure, the relationship between the length L1 of the hollow shaft portion 4 and the thickness t of the board 18 serving as the wall surface base material is set to a relationship of L1 ≧ t, and the length L2 of the blade portion 5 is set. And the thickness t of the board 18 are set such that L2 ≧ t.
[0018]
The relationship between the inner diameter D1 of the blade 5 and the thread diameter d of the thread 10 of the mounting screw 6 is set to D1 ≧ d.
[0019]
The blade portion 5 has a substantially semi-cylindrical cross section and protrudes with the hollow shaft portion 4 having an inner diameter coaxially and with the same diameter, and the outer peripheral surface of the tip portion of the blade portion 5 is an inclined surface 21 having a smaller diameter toward the tip. The tip is a cutting edge 14 perpendicular to the axial center, and both side edges are cutting edges 15.
[0020]
Further, biting convex portions 9 of the mounting screw are provided along the axial direction at two positions facing the convex portion 9 of the bendable piece 13 across the axial center on the inner surface of the hollow shaft portion 4, and further hollow From the part which faces the bendable piece 13 on the inner surface of the shaft part 4 to the inner surface of the blade part 5, a protrusion 22 into which the mounting screw 6 bites is provided along the axial direction.
[0021]
As shown in FIG. 1 (E), the protrusion 22 is located between the convex portions 9 of the hollow shaft portion 4, and as shown in FIG. 1 (F), a position close to the head 2 on the inner surface of the hollow shaft portion 4. Starting from the upper end of the bendable piece 13 and is inclined upward, parallel to the axial center of the hollow shaft portion 4 at a position corresponding to the end portion of the bendable piece 13, and its tip is the tip edge 14 of the blade portion 5. In addition, the outer periphery protrudes slightly outward in a sharp arc shape, and this protruding portion serves as a cone tip 23 that stabilizes when screwed.
[0022]
The threaded anchor 1 according to the present invention is configured as described above, and in order to fix various devices 19 to the gypsum board 18 or the like, as shown in FIG. When the driver 20 is engaged, the cone tip 23 protruding from the tip of the blade portion 5 of the anchor 1 is pierced into the board 18 and rotated while the rotation axis of the anchor 1 is fixed, the cone tip 23 that becomes a sharp blade tip is formed. The gypsum board 18 is perforated while maintaining rotation in a fixed position, and then the cutting edge 14 at the front end cuts the board 18 into a circle, and at the same time the cutting edge 15 on the side cuts the board 18, thereby cutting the blade portion 5. Enters the board 18.
[0023]
At this time, since the blade portion 5 has a substantially semicircular cross section, the cutting waste does not come out on the surface side of the board 18, the finish of the surface of the board 18 after the anchor 1 is screwed in is beautiful, and the blade portion Since 5 has a substantially semicircular cross section, after a part of the peripheral wall is opened and penetrates the board 18, the cutting waste confined in the inside is well discharged, and the mounting screw 6 screwed into the anchor 1 is pressed. It can be easily detached and no extra resistance is given to the screwing of the mounting screw 6.
[0024]
When the blade portion 5 cuts out the board 18 to form a lower hole, the hollow shaft portion 4 enters the lower hole, and the male screw 3 provided on the outer periphery of the hollow shaft portion 4 is screwed into the lower hole firmly. The anchor 1 is fixed to the board 18 with the head 2 in contact with the surface of the board 18.
[0025]
In this state, as shown in FIG. 2B, when the mounting screw 6 is screwed into the hollow shaft portion 4 of the anchor 1 from the equipment 19 superimposed on the head 2, the mounting screw 6 becomes the through hole 8 of the hollow shaft portion 4. In the inner circumference of the head, it enters each tapped portion 9 while tapping.
[0026]
When the attachment screw 6 enters the hollow shaft portion 4, it rides on the upward slope of the ridge 22, so that the attachment screw 6 enters the upward slope side of the ridge 22 while inclining. The bendable piece 13 is pushed outward with an inclination, and the bendable piece 13 protrudes outward from the outer periphery of the hollow shaft portion 4 while partially compressing the board 18, thereby securing the rotation of the anchor 1 with respect to the board 18. Then, the pull-out strength of the anchor 1 and the mounting screw 6 is obtained. When the mounting screw 6 is completely screwed in as shown in FIG. 2B, the mounting screw 6 is inclined with respect to the axis of the hollow shaft portion 4. The device 19 penetrates in the state, and the equipment 19 can be firmly fixed by the mounting screw 6 using the anchor 1 as a base reinforcing material.
[0027]
Next, when the mounting screw 6 is rotated in the loosening direction to remove the equipment 17, a rotational moment in the rotational direction of the mounting screw 6 is applied to the anchor 1, but the anchor 1 has the bendable piece 13 outward. Since it protrudes, it becomes a detent shape, and due to the protrusion of the bendable piece 13, the resistance force against the rotational moment of the anchor 1 is asymmetric with respect to the central axis, so even if the mounting screw 6 is rotated in the loosening direction, The device 19 can be removed with the anchor 1 remaining on the board 18 without causing the anchor 1 to rotate together.
[0028]
【The invention's effect】
As described above, according to the present invention, the hollow shaft portion into which the mounting screw is screwed is coupled with the substantially semi-cylindrical blade portion whose tip is the blade edge, and a cut is made in the peripheral wall of the hollow shaft portion and surrounded by the cut. In a threaded anchor formed on a bendable piece for rotation prevention that is pushed by a mounting screw screwed into the hollow shaft portion and protrudes outward, it is possible to extend from the inner surface of the hollow shaft portion to the inner surface of the blade portion. Starting from a position close to the head on the inner surface of the hollow shaft portion at a position facing the curved piece, it is inclined upward toward the tip portion of the bendable piece, and at the position corresponding to the tip portion of the bendable piece, the hollow shaft portion Since the ridge parallel to the shaft center is provided, the mounting screw is screwed onto the inclined part of the ridge to incline, and this inclination causes the bendable piece to protrude outward, and thus to protrude outward. When the bending resistance can improve the pull-out strength To, without co-rotation generation anchors when removing the mounting screws, it can be reliably prevented loss of the anchor.
[0029]
In addition, the tip of the blade tip is in stable contact with the wall surface base material, and the screwing operation can be performed smoothly, and the blade portion has a substantially semi-cylindrical cross section, so that chips are contained inside and are placed on the surface of the wall surface base material. A beautiful finish after loading the anchor is obtained.
[Brief description of the drawings]
1 (A) is a front view showing the anchor of the present invention, (B) is a side view of the same, (C) is the plan view, (D) is the bottom view, arrows (E) is (A) Sectional view of ee, (F) is a longitudinal side view of the anchor. [FIG. 2] ( A) is a longitudinal sectional view showing an initial state of screwing the anchor into the board, and (B) is fixing the equipment to the anchor with a mounting screw. Vertical cross section [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Anchor 2 Head 3 Male screw 4 Hollow shaft part 5 Blade part 6 Mounting screw 7 Engagement groove 8 Through-hole 9 Protrusion part 11 Cut | notch 12 Inclined protrusion 13 Flexible piece 14, 15 Cutting edge 18 Board 21 Inclined surface 22 Projection 23 Cone tip

Claims (2)

A male screw (3) is provided on the outer periphery of the hollow shaft portion (4) having a head (2) at one end, and the other end of the hollow shaft portion (4) has an inner diameter coaxial with the hollow shaft portion (4). forms with the extended shape of the cross section semi-cylindrical blade portion (5) which projects a same diameter, previously end outer peripheral surface of the cutting portion (5) is an inclined surface which becomes smaller in diameter toward the tip ( formed in 21), the tip axis perpendicular cutting edge (14), and a cutting edge (15) on both side edges of the blade portion (5) is provided, the blade portion in the circumferential wall of the hollow shaft portion (4) (5 ) At the position opposite to the coupling of the two peripheral cuts (11) extending in parallel from the open end of the peripheral wall to the head (2) side, and a bendable piece between the cuts (11). In the threaded anchor forming (13),
A protrusion (22) into which a mounting screw is inserted is provided along the axial direction at a position facing the bendable piece (13) from the inner surface of the hollow shaft portion (4) to the inner surface of the blade portion (5). The strip (22) starts from a position close to the head (2) on the inner surface of the hollow shaft (4) and rises toward the tip of the bendable piece (13), and the tip of the bendable piece (13) A threaded anchor, characterized in that it is parallel to the axis of the hollow shaft (4) at a position corresponding to the part.   The bendable piece (13) is provided on the inner surface with a biting projection (9) of a mounting screw along the axial direction of the hollow shaft portion (4), and the tip of the ridge (22) is located on the blade portion (5). 2. A threaded anchor according to claim 1, characterized in that it projects outwardly beyond the tip edge (14).

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