JP3074989U - Security-Screws and Special Tools - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention is a security screw having a safety function that cannot be easily rotated without using a special tool. An annular groove (12) having a male screw portion (17) at a lower portion and an arbitrary shape that can be fixed in a circumferential direction is provided at a center of an upper surface of an arbitrary shape of a head (11). A protrusion 15 is provided upward at the center of the upper surface of the head 11 and inside the annular groove 12.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a security screw having a safety function so that it cannot be easily rotated, and a dedicated tool for the security screw.

[0002]

[Prior art]

 As shown in FIGS. 10 to 13, the conventional screw is provided with a-(minus) groove 2, a + (plus) groove 3, a hexagonal hole 4, and a hexagonal head 5 at the center of the upper surface of the screw head. Each screw is rotated using a minus (-) screwdriver, a plus (+) screwdriver, a hexagon wrench, a spanner, or the like. Many different sizes of -driver, + driver, hexagon wrench, spanner, etc. are available on the market.

[0003] In addition, a large number of -screw 2a, + screw 3a, hex-headed screw 4a, and hex-headed screw 5a having different dimensions are available. As a result, anyone can easily obtain a screwdriver or the like, and can easily turn the screw to remove it.For example, a structure assembled with screws is mischievous and easily disassembled. There is a problem.

A conventional screw is convenient because anyone can easily turn it using a screwdriver or the like, but has almost no protection function for preventing unauthorized rotation by a third party. Therefore, in order to prevent the screw from being removed, it is necessary to take measures such as fixing the screw by welding, or holding the screw inside to prevent rotation from the outside, etc. Met. However, if the screw is welded and fixed, it will not be easy to remove it, and it will be costly to prevent the screw from rotating from the outside, and if the original function of the screw that can be fixed detachably can be lost. There was a drawback.

[0005] Further, in the case of a screw 5a having a hexagonal head 5 as shown in FIG. 13, it has a corner portion 6 on the outer peripheral surface and the protruding portion of the head is tall, so that, for example, a column of a guardrail When used to attach a guard plate to a vehicle, the hexagonal head protrudes from the guard plate, causing injury when hitting the body, and was not environmentally friendly.

[0006]

[Problems to be solved by the invention]

 As described above, conventional screws have the convenience of being able to easily turn and remove screws using tools such as a general-purpose screwdriver, but anyone can easily remove them. There was a problem of lacking.

[0007] That is, since many -drivers, + drivers, hexagon wrenches, spanners and the like have different dimensions, various screws can be easily rotated and removed. For this reason, there is a problem in that the structure assembled using screws can be easily disassembled or destroyed and lacks safety measures.

In the present invention, an annular groove is provided at the center of the upper surface of the head of the screw, and the screw is rotated using a special tool having an engaging portion that matches the annular groove, and has a security function. It provides a new screw.

[0009]

[Means for Solving the Problems]

 The present invention is intended to solve the above-described problem, and has an externally threaded portion at a lower portion, and an annular groove having an arbitrary shape that can be fixed in a circumferential direction at the center of the upper surface of an arbitrary shaped head, A projection is provided at the center of the upper surface of the head and inside the annular groove.

In the annular groove according to the present invention, a plurality of convex receiving portions protruding in the radial direction and a plurality of concave receiving portions recessed in the radial direction are alternately positioned at regular intervals. It is characterized by being formed continuously with a gentle curve.

[0011] Further, the protrusion according to the present invention is formed at the center of the inside of the annular groove to form an upwardly tapering frustoconical shape, and the upper surface of the protrusion is substantially the same as the upper surface of the head. It is characterized by being formed on a surface.

In addition, the male screw portion having the head according to the present invention is provided with a smooth surface on the outer peripheral surface and a through hole formed in the center of a concave portion provided in the center of the upper surface. A rotatable insertion member.

[0013] Furthermore, at one end of the rod according to the present invention, a blind concave portion is provided on the lower surface of the engaging portion formed in a truncated conical shape so as to be tapered, and the center of the upper surface of the screw head is provided. And engaged with the annular groove provided therein to be fixed and rotated in the circumferential direction.

Further, the engaging portion according to the present invention includes an engaging convex portion and an engaging concave portion respectively corresponding to a convex receiving portion and a concave receiving portion constituting an annular groove provided at the center of the upper surface of the head of the screw. Are formed continuously.

[0015] Furthermore, the concave portion according to the present invention has a narrow upper portion and a slightly wider lower portion, and engages with a protrusion provided in the center of an annular groove provided at the center of the upper surface of the screw head. It is characterized by being formed as described above.

[0016] With the above configuration, the screw can be turned unless a dedicated tool provided with an engaging portion at one end of the shaft rod that matches an annular groove provided in the center of the upper surface of the head of the screw. I can't do it. Also, since the annular groove is formed in a narrow width, it is safe because other tools cannot be inserted. In addition, even if the outer shape of the rod is formed in conformity with the annular groove of the screw, a concave portion for accommodating the projection provided at the center of the annular groove is not provided, unless the concave portion is provided in the annular groove. The screw cannot be turned by inserting the tool.

[0017]

[Embodiment of the invention]

 The embodiment of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 10 denotes various screws. Reference numeral 11 denotes a screw head having a circular outer periphery. For example, an annular groove 12 having a substantially star shape, that is, a substantially pentagonal shape when viewed from a plane is provided. The annular groove is not limited to a substantially pentagonal shape, but may be an annular groove having an arbitrary shape that can be engaged with and rotated in the circumferential direction.

As shown in FIG. 2, the annular groove 12 has five convex receiving portions 13 protruding in the radial direction formed at regular intervals on the same circumference. Between 13 and 13, recessed receiving portions 14 and 14 which are recessed in the radial direction are provided at regular intervals on the same circumference. The convex receiving portion 13 and the concave receiving portion 14 are formed continuously with a gentle curve.

Inside the annular groove 12, there is provided a substantially frustoconical projection 15 tapering upward from the bottom of the annular groove provided at the center of the upper surface of the head 10. . The protrusion 15 is formed on the same surface as the upper surface of the head 10 as shown in FIG. 1, but it is not always necessary to provide it on the same surface. Further, a male screw portion 17 is provided on the lower surface of the head. Since the projection 15 has a function of prohibiting entry when a known rotary tool is inserted into the annular groove 12, the upper surface of the projection is formed substantially flush with the upper surface of the head 11. However, it is not always necessary to make the same plane.

FIG. 3 shows the second screw 10a. The center of the upper surface of an inverted frustoconical head 11a provided with a male screw portion 17 at the lower portion is provided with the same shape as that shown in FIG. An annular groove 12 having a substantially pentagonal shape is formed. At the center of the upper surface of the head and inside the annular groove, a protrusion 15 having a tapered and frusto-conical shape is formed upward, and the protrusion 15 and the head 10 of the screw are formed. The height is preferably formed on the same surface, but is not necessarily formed on the same surface.

FIG. 4 shows the third screw 10b. The third screw 10b is formed in a rod shape, the lower end is formed in a pointed shape, and the male screw portion 17b having a coarse pitch is formed in a spiral shape on the outer periphery. A screw 11 is provided with a head 11b having a downward slope and a substantially truncated cone shape above the tap screw. An annular groove 12 having the same shape as that shown in FIG. 2 is formed at the center of the upper surface of the head, and the inside of the annular groove and the center of the head are tapered upward. It is preferable that a projection 15 having a truncated cone shape is formed, and the height of the projection 15 and the head 10 of the screw be formed on the same plane, but it is not necessary to form them on the same plane.

In FIG. 5, the head 11 of the screw 10 shown in FIG. 1 is rotatably engaged with the center of the upper surface of the locking seat 20. The outer shape of the locking seat portion 20 is circular and formed on a smooth surface 21, and a through hole 24 is provided in the center of a circular concave portion 22 provided at the center of the locking seat portion in the vertical direction. It is. The male screw portion 17 of the screw 10 is inserted into this through hole so as to freely rotate, and the head 11 is rotatably housed in the circular recess 22.

The outer peripheral surface of the locking seat portion 20 is formed in, for example, an arcuate surface portion so as to eliminate steps and corners and to form a gentle surface so as to be environmentally friendly. In the figure, reference numeral 15 denotes a tapered and truncated cone-shaped protrusion 15 formed in the inside of the annular groove, and the height of the protrusion 15 and the height of the screw head 10 are the same. Although it is preferable to form them on a plane, they need not necessarily be formed on the same plane.

In FIG. 6, the head 11 of the screw 10 shown in FIG. 1 is rotatably engaged with the center of the locking seat 20a. The locking seat 20a has a circular recess 22a at the center and a through hole 24a at the center of the recess. The male screw portion 17 is inserted through the through hole 24a, and the head 10 is rotatably accommodated in the recess. The outer peripheral surface of the locking seat portion 20a has a gentle surface such as a tapered inclined surface. 21a is provided so as to be environmentally friendly. In FIG. 6, reference numeral 15 denotes a protrusion provided in the annular groove, which has a hand and is tapered upward and formed in a truncated cone shape.

FIGS. 7 and 8 show, for example, a dedicated tool 40 for rotating the screw 10 according to the present invention, in which an end portion of a rod 41 is provided with an engagement portion 42 having a truncated cone shape so as to be tapered. The lower surface of the engaging portion 42 is provided with a truncated conical recess 44 so that the upper portion is narrow and the lower portion is slightly wide. In this case, it is needless to say that the shape is not necessarily a truncated cone but may be a column-shaped recess.

On the peripheral surface of the engaging portion 42, an engaging convex portion 42 a protruding in the radial direction, which engages with the convex receiving portion 13 of the annular groove 12 provided on the head 11 of the screw. And an engaging concave portion 42b which is engaged with the concave receiving portion 14 of the annular groove and is recessed in the radial direction. The engaging convex portion 42a and the engaging concave portion 42b are connected by a gentle curve. For example, it is formed in a substantially star shape, that is, a substantially pentagon.

The special tool 40 may be formed by bending the upper end of the rod 41 into a substantially right angle to form an L-shape so as to be able to rotate by applying force, and a handle ( (Not shown), or a handle (not shown) may be provided via a clutch mechanism (not shown) that can rotate in only one direction.

Next, the operation of the screw and the special tool according to the present embodiment will be described. To loosen the screw 10 by rotating the special tool 40, as shown in FIG. The engaging portion 42 of the special tool is engaged with the annular groove 12 in the head 11 provided with the threaded or inserted thread 17 in the hole 31 formed. That is, as shown in FIG. 2, the engaging convex portion 42a and the engaging concave portion 42b of the special tool are matched with the convex receiving portion 13 and the concave receiving portion 14 of the annular groove 12 provided on the screw head 11 (FIG. 9).

Since the inside of the annular groove 12 provided in the head 11 of the screw has the same height as the upper surface of the head and a truncated conical projection 15 tapering upward, If the recessed portion 44 for accommodating the projection is not formed on the bottom surface of the engagement portion 42, the bottom surface of the engagement portion cannot engage with the annular groove 12 because the projection 15 is provided. As a result, the screw cannot be rotated while being fixed in the circumferential direction. Also, since the protrusion 15 and the recess 44 have a large upper diameter and a narrow lower diameter, respectively, even if the center of the engaging portion is slightly displaced from the center of the concave portion, it can be inserted smoothly. Can be.

As described above, on the outer periphery of the lower part of the rod 41 constituting the dedicated tool 40, the engaging portion 42 having a truncated cone shape is provided so as to taper downward, and the circumference of the engaging portion is formed. An engaging projection 42a protruding in the radial direction and an engaging recess 42b concave in the radial direction are provided alternately and continuously. Further, the bottom of the rod 41 is provided with a truncated conical recessed portion 44 that tapers upward, so that the recessed portion 44 is provided in the annular groove 12 provided at the center of the head of the screw. Since a certain projection 15 can be accommodated, the engagement portion 42 can be engaged in the annular groove 12 and fixed in the circumferential direction to rotate the screw.

Furthermore, since the annular groove 12 provided at the center of the upper surface of the screw head 11 is provided so as to be inclined upward and outward, the upper diameter of the annular groove is slightly larger, and The diameter is narrow. Also, since the engaging portion 42 provided at one end of the shaft 41 of the rotating tool is tapered downward, the engaging portion 42 can be easily inserted into the annular groove 12 to engage. The screw 10 can be tightened or loosened by rotating the screw 10 immediately.

[0032]

[Effect of the invention]

 In the present invention, an annular groove is provided at the center of the upper surface, not at the peripheral portion of the screw head, the peripheral portion of the head portion is formed on a gentle surface, and the screw is mounted without providing a step between the screw and the portion to be mounted. Can provide an environmentally friendly screw. In addition, a dedicated tool provided with an engaging portion that matches the annular groove provided in the head of the screw is not versatile, and the screw cannot be turned without using the dedicated tool, thus making it simple. With a simple configuration, the security function of the screw can be enhanced. In addition, the use of the locking seat allows the screw to be turned and attached without damaging the surface of the attached portion.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a screw having a circular head according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partially broken front view of a screw having a dish-shaped head.

FIG. 4 is a partially cutaway front view of a screw having a head of a downward slope on the peripheral surface.

FIG. 5 is a partially cutaway front view of a state in which a screw having a disk-shaped head is combined with a locking seat having an arcuate surface on the outer peripheral surface.

FIG. 6 is a partially cutaway front view showing a state in which a screw having a disk-shaped head is combined with a second locking seat having a downward slope portion on an outer peripheral surface;

FIG. 7 is an enlarged sectional view of a main part of the rotary tool with a part cut away.

FIG. 8 is a bottom view of FIG. 7;

FIG. 9 is a cross-sectional view of a main part in a state where a rotating tool is engaged with an annular groove of a screw.

FIG. 10 is a plan view of a screw head having a minus groove.

FIG. 11 is a plan view of a screw head having a plus groove.

FIG. 12 is a plan view of a screw head having a hexagonal hole.

FIG. 13 is a plan view of a screw head having a hexagonal head.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 screw 11 head 12 annular groove 13 convex receiving portion 14 concave receiving portion 15 protrusion 17 male screw portion 20 locking seat 21 gentle surface 22 concave portion 24 through hole 30 attached portion 40 dedicated tool 41 rod 42a engagement Convex part 42b engaging concave part 44 concave part

Claims (7)

[Utility model registration claims] An annular groove (12) having an externally threaded portion (17) at a lower portion and having an arbitrary shape that can be fixed in a circumferential direction is formed in the center of the upper surface of a head (11) having an arbitrary shape, A security screw provided with a projection (15) located at the center of the upper surface of the head (11) and inside the annular groove (12). 2. The annular groove (12) includes a plurality of radially projecting convex receiving portions (13) and a plurality of radially concave receiving portions (14) at regular intervals. 2. The security screw according to claim 1, wherein the security screw is formed continuously with a gentle curve by alternately locating the security screw. 3. The projection (15) is provided with the annular groove (1).
2) forming an upwardly tapering frustoconical shape positioned at the center of the interior of 2), and forming the upper surface of the projection (15) and the upper surface of the head (11) on substantially the same plane; The security screw according to claim 1 or 2, wherein 4. An external thread (1) having said head (11).
7) is inserted into the through hole (24) of the locking seat portion 20 having the through hole (24) at the center of the concave portion (22) provided at the center of the upper surface with the gentle surface (21) provided on the outer peripheral surface. 4. The security screw according to claim 1, wherein the security screw is rotatably inserted. 5. A screw head comprising a bar (41) provided at one end with a blind recess (44) on the lower surface of an engaging portion (42) formed in a truncated conical shape so as to be tapered. A dedicated tool for a security screw, characterized in that it is engaged with an annular groove (12) provided at the center of the upper surface of the part (11) and is fixed and rotated in the circumferential direction. 6. The engagement part (42) is provided with a screw head (1).
An engaging convex portion (42a) and an engaging concave portion (42b) respectively corresponding to the convex receiving portion (13) and the concave receiving portion (14) constituting the annular groove (12) provided at the center of the upper surface of 1). 6. The security screw dedicated tool according to claim 5, wherein the tool is formed continuously. 7. The recess (44) has a narrow upper portion and a slightly wider lower portion, and a protrusion provided at the center of an annular groove (12) provided at the center of the upper surface of the screw head (11). (15)
The dedicated tool for a security screw according to claim 5, wherein the tool is formed so as to be engaged with the security screw.