JPH09317732A - Self-locking/tapping screw member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-locking function with a screw for keeping a screwed state in accordance with screwing based on tapping cut. SOLUTION: A fastening body 13, and a tapping body 14 continued from the fastening body 13 serving as a tapping screw part and provided with a tapping introduction part 15 on its leading end are provided. A tapping screw thread 21 is formed on the tapping body 14 from the side of the tapping interdiction part 15 with a specified leas angle and pitch being provided with tapping cut function. A male screw from is formed on the fastening body 13, which form is continued from the tapping screw thread 21 with the same lead angle and pitch. A top of the male screw from is divided into two by a cutting groove of specified depth along the spiral form, and a pair of screw tops gradually branched from a tapping screw head 22 of the tapping screw thread 21 are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-locking tapping screw member, and more particularly, to a guide hole of a member to be fastened, the tapping screw hole being formed by its own cutting action. The present invention relates to a self-locking tapping screw member that can be self-locked by a spring function for preventing loosening after being screwed into a screw hole.

[0002]

2. Description of the Related Art Generally, as a self-locking means for preventing usual loosening of screw members such as bolts and nuts, conventionally, there is a spring washer interposing a spring function, or a rubber or plastic friction patch. It is well known that the purpose of each of these is to increase the frictional resistance due to the interposition such as, but in the case of each of these self-locking means, in addition to the original screw member, the resistance due to the spring property and the frictional property is separately added. It has the disadvantage of requiring a third member having a functional element, and also has poor workability for screwing, and it is difficult to ensure the functionality and reliability, and the fastening mode has sufficient reliability. I couldn't get it.

As a self-locking screw member that has improved such disadvantages, for example, Japanese Patent Publication No. 3-4.
As disclosed in Japanese Patent No. 6686, a radial slit groove is formed in each of a screw thread portion on a bolt side and a screw hole portion on a nut side which form a screw, and these two slits are mutually formed. A screw member that elastically deforms the thread or screw hole toward the slit groove during screwing to effectively utilize the restoring force, that is, the spring function, to obtain a desired self-locking action. It has also been proposed.

On the other hand, one form of this type of screw member is a so-called tapping screw member. As is well known, the tapping screw member, simultaneously with the formation of the tapping screw hole by the self-drilling action with respect to the object to be screwed, simultaneously engages itself with the tapping screw hole. This tapping screw member does not require a nut to be screwed or a member similar to a nut, and is therefore widely used in various technical fields.

[0005]

However, the tapping screw member according to the above-mentioned conventional structure has a screw structure which is relatively hard to loosen in that the tapping screw member is screw-fastened to the screw hole by self-tapping. However, for example,
If the applied part is a part with continuous vibration,
Just as in the case of a screw member formed by the mutual combination of general bolt and nut members, loosening may occur in the screw fastening, and here again, a loosening prevention member is required, which causes the same inconvenience. have.

Further, in this type of tapping screw member, in particular, as described above, after performing the screwing fastening based on the self-tapping screw cutting, if necessary, once unscrewing, and then again However, in the case where the screwing is performed, the loosening at the time of fastening due to the re-screwing is known to be serious, and there is an unfavorable problem that the re-screwing itself sometimes becomes impossible. It was

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem.
In accordance with the formation of the thread groove portion based on its own tapping and the threaded fastening to the thread groove portion, a self-locking function for constantly maintaining this threaded fastening state is given, and if necessary, once, It is to provide a self-locking tapping screw member of this type that enables re-fastening after screwing out.

[0008]

In order to achieve the above object, the invention according to claim 1 of the present invention is a head body for tightening, and a tightening screw connected to the head body for tightening. And a tapping main body part having a tapping screw part connected to the fastening main body part and having a tapping introducing part formed at a tip end side thereof, wherein the tapping main body part includes the tapping introducing part side. From the predetermined lead angle, and a tapping screw thread formed in a male screw shape at a pitch interval to give tapping drilling capability, the fastening body portion has the same lead angle continuously to the tapping screw thread,
And a pair of screw threads that form a male thread shape with a pitch interval, and divide the male thread shaped thread crest into two by a notch groove of a required depth along the spiral to gradually branch from the tapping thread crest of the tapping screw thread. After forming the screw crests, the divided screw thread crests are slightly expanded in a direction orthogonal to the cut groove to provide a spring function to the cut groove side between the screw crest tops. The self-locking tapping screw member is provided with a self-locking screw thread.

Therefore, the self-locking device according to claim 1
In the tapping screw member, following the tapping drilling formation of the required internal thread portion in the guide small hole of the fastening target member by the tapping screw thread, the tapping screw thread is continuously formed with respect to the drilled internal thread portion. The formed self-locking screw threads are screwed together, and by extension, the pair of screwing screw tops of the self-locking screw threads are respectively pressed and compressed against the elasticity of their own toward the cut groove side. It is screwed and fastened in a state in which the spring property is imparted, and the required loosening prevention action is surely and effectively achieved by the spring function. Further, since the tapping screw thread and the self-locking screw thread are continuous in series, it is possible to accurately and easily form the shape of both of them, and at the same time, tapping the female thread portion with the tapping screw thread. Chips and the like generated during cutting do not enter into the cut groove of the self-locking screw thread, and the self-locking screw after the cutting can be reliably and reliably performed.

According to a second aspect of the present invention, in the self-locking tapping screw member according to the first aspect, the tapping screw top portion of the tapping screw thread and the self-locking branching from the tapping screw top portion. In each of the threaded screw tops of which the threaded threads are divided, an outer diameter within a required range of each threaded screw top side including at least a branch portion, or a part including a part of the tapping screw top side and a branch portion The outside diameter within the required range on the screw thread top side is formed to be slightly smaller than the outside diameter outside each required range of the tapping screw top and each screw thread top. It is what

Therefore, the self-locking device according to claim 2
In the tapping screw member, the presence of each screwing screw top including at least a branching portion having a small outer diameter within a required range, or each screwing including a part of the tapping screw topside and a branching portion. Due to the presence of the screw crests, after tapping and forming the required female threaded portion by the tapping threads, the self-locking screw thread on the drilled female threaded portion is screwed by the pair of threaded screw tops, respectively, In addition, the threaded transition can be easily and smoothly performed in the cut groove side in the state of being imparted with the spring property that is pressed and compressed against the elasticity of itself.

According to a third aspect of the present invention, a fastening head body portion, a fastening screw portion which is connected to the fastening head body portion and serves as a fastening screw portion, and a fastening introduction portion is formed on the tip end side. The tapping main body includes a main body and a tapping main body that is connected to the fastening main body to serve as a tapping screw portion and has a tapping introducing portion formed on a tip side thereof. The tapping main body includes a predetermined lead from the tapping introducing portion side. Angles and tapping threads formed in a male thread shape at a pitch interval to give tapping drilling capability are provided, and the fastening main body is provided with a tapping thread from the fastening introduction portion side, in addition to the tapping threads. A male screw shape having the same lead angle and pitch interval is formed, and a portion corresponding to the introduction of the male screw shape is left, and the screw top is divided into two by a cut groove having a required depth along the spiral. Each screwing thread crest over which the formation of,
Each self-locking screw thread provided with a spring function to the cutting groove side is provided between the screw screw tops by slightly expanding the divided screwing screw tops in a direction orthogonal to the cutting groove. It is a self-locking tapping screw member characterized by that.

Therefore, the self-locking device according to claim 3
In the tapping screw member, following the tapping drilling of the required internal thread portion into the guide small hole of the fastening target member by the tapping screw thread, the tapped internal thread portion is separated from the tapping screw thread. The self-locking screw thread formed separately is screwed, and the pair of screw thread tops of the self-locking screw thread are respectively pressed and compressed against the cut groove side against their own elasticity. Further, they are screwed and fastened in a state in which the spring property is imparted, and the required loosening prevention action is surely and effectively achieved by the spring function. Further, since the tapping screw thread and the self-locking screw thread are individually present due to the interposition of the fastening introduction portion between the tapping main body portion and the fastening main body portion, these can be formed individually. As a result, chips and the like generated when the female screw portion is pierced by the tapping screw thread do not enter the cut groove of the self-locking screw thread, and the self-locking screw can be reliably and reliably performed.

According to a fourth aspect of the present invention, in the self-locking tapping screw member according to any one of the first to third aspects, the tapping introduction portion is tapped into the tapping screw thread from the tip end side. It is characterized in that a slotted portion, a gouged portion and the like for forming the blade portion are cut.

Therefore, the self-locking device according to claim 4
In the tapping screw member, the tapping cutting blade portion formed at the tip of the tapping screw thread at the tapping introducing portion improves the tapping cutting performance into the guide small hole during tapping cutting.

According to a fifth aspect of the present invention, in the self-locking tapping screw member according to the first to third aspects, the number of spiral turns of the tapping screw thread is about one or one and a half turns. It is characterized in that it is set to a relatively small number of turns.

Therefore, the self-locking device according to claim 5
In the tapping screw member, the required length of the tapping main body can be shortened by setting the number of spiral turns of the tapping screw thread to the tapping main body to one or a relatively small number of turns of about one and a half turns. .

According to a sixth aspect of the present invention, in the self-locking tapping screw member according to any one of the first to fifth aspects, the fastening body portion and the tapping body portion including the tapping introduction portion are traversed. The surface shape is formed in a circular shape.

Therefore, the self-locking device according to claim 6
In the tapping screw member, the desired tapping screw thread is easily formed from the tapping introduction part side on the outer peripheral surface of the tapping main body with a circular cross section, and the outer peripheral surface of the fastening main body with a circular cross section is formed. On the other hand, a self-locking screw thread having a desired spring property is easily formed between the pair of screw thread tops corresponding to the female screw drilled by the tapping screw thread from the fastening introduction portion side. It

According to a seventh aspect of the present invention, in the self-locking tapping screw member according to any one of the first to fifth aspects, the fastening body portion and the tapping body portion including the tapping introduction portion are traversed. The surface shape is formed in a polygonal shape having a plurality of arcuate ridge corner portions at equal angular intervals on the same circumference, and the invention according to claim 8 is the invention according to claim 1 above. In the self-locking tapping screw member according to any one of 1 to 5, among the fastening main body portion and the tapping main body portion including the tapping introduction portion, the cross-sectional shape of at least the tapping main body portion including the tapping introduction portion is on the same circumference. It is characterized in that it is formed in a polygonal shape having a plurality of arcuate ridge corner portions at equal angular intervals.

Therefore, in the self-locking tapping screw member according to the seventh and eighth aspects, the tapping screw is as intended from the tapping introducing portion side with respect to the outer peripheral surface of the tapping main body having a polygonal cross section. A thread is easily formed, and a spring is provided between the tops of a pair of screw threads on the outer peripheral surface of the cross-section polygonal shape of the fastening main body, corresponding to the female thread drilled with the tapping thread from the fastening introduction section side. The desired self-locking screw thread is easily formed. Further, in the former formation of the tapping screw thread on the outer peripheral surface of the polygonal cross section, the tapping excavability of the female screw portion by the tapping screw thread becomes good, and the latter self-locking screw thread is formed. Then, the screw-fastening operation of the self-lock screw thread with respect to the female screw portion becomes easy.

According to a ninth aspect of the present invention, in the self-locking tapping screw member according to the third aspect, the self-locking screw member is spaced from the tapping screw thread at the same pitch interval. The screw thread is formed, and the invention according to claim 10 is the self-locking tapping screw member according to claim 3, wherein the tapping screw thread is aligned with the extension line in the spiral direction of the tapping screw thread. The self-locking screw thread is formed.

Therefore, in the self-locking and tapping screw member according to the ninth and tenth aspects, the self-locking tapping screw member is self-locking at the same pitch interval with respect to the tapping screw thread or on the extension line in the spiral direction. In order to form the screw thread, the screw-fastening operation of the self-locking screw thread to the female screw portion is quickly performed in accordance with the tapping drilling of the female screw portion by the tapping screw thread.

The invention according to claim 11 of the present invention is
The self-locking tapping screw member according to claim 3, wherein the self-locking screw thread is formed at different pitch intervals with respect to the tapping screw thread. In the self-locking tapping screw member according to claim 3, the described invention is characterized in that the self-locking screw thread is formed by deviating from the extension line of the tapping screw thread in the spiral direction. is there.

Therefore, in the self-locking and tapping screw member according to the eleventh and twelfth aspects, the self-locking tapping screw member is separated from the tapping screw thread by different pitch intervals or deviated from the extension line in the spiral direction. Since the threads are formed, after tapping and forming the internal threads with the tapping threads, the pitch difference or the operation difference on the operation surface corresponding to the deviation in the spiral direction causes a margin to the internal threads. The self-locking screw thread is screwed and fastened.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the self-locking tapping screw member according to the present invention will be described below in detail with reference to FIGS. 1 to 8.

First Embodiment FIGS. 1A and 1B show a first embodiment of the present invention (claim 1).
FIG. 2 is a side view showing a screw material for forming a self-locking tapping screw member to which the above (1) is applied, and an external side view showing an outline of the formed self-locking tapping screw member. A plane development view schematically showing an enlarged form of a self-locking screw thread including a tapping screw thread formed from a tapping main body portion of a self-locking tapping screw member to a fastening main body portion and a rising portion, and FIG. 3 is an enlarged partial cross-sectional view showing each of the main parts of the same as above, and FIG. 3 is an explanatory view showing the mutual relationship between the cross section of the tapping screw thread and the cross section of the self-lock screw thread. 4 (a) to 4 (d) are explanatory views sequentially showing the operation modes of tapping and threaded fastening, and FIG. 5 is a self-locking screw on the female thread portion by tapping and drilling. It is a fragmentary sectional view showing each state of joint fastening.

That is, the first shown in FIG. 1 to FIG.
In the mode of the embodiment, as shown in FIG. 1A, the self-locking and tapping screw member 11 is constructed by, for example, a round head shape / flat head shape with a plus groove for tightening operation (as a tightening tool). Head unit for which any arbitrarily selected tightening tool corresponding means such as a hexagonal head (corresponding to a wrench as a tightening tool) is used, for example, in this case With the possible head body portion 12 having a plus groove, the head body portion 12
Is connected to the inner side (screw side) of the screw to form a fastening screw portion, and as will be described subsequently, a required outer diameter D _b set corresponding to the effective height of the screw thread to be formed by rolling on the fastening screw portion. Fastening body portion 13 having a circular cross-section, and the fastening body portion 13
Is connected to the tip end side of the tapping screw portion to form a tapping screw portion, and as will be described below, the required outer diameter D _a ( _a ) corresponding to the effective height of the tapping screw thread formed on the tapping screw portion by rolling is formed. However, the tapping main body 14 has a circular cross-sectional shape of D _b = D _a ) and has a tapping introduction portion 15 having an arbitrary external shape suitable for tapping excavation such as a gimlet shape or a taper shape at least on the tip side. A screw material 11a is used (see FIG. 1 (a)).

Here, with respect to the setting of the required outer diameters D _b and D _a of the fastening main body 13 and the tapping main body 14 including the tapping introducing portion 15, these are respectively referred to as "effective thread heights". As described in the following, by using the required thread rolling rolls, rolling plates, etc. corresponding to each, the respective threads are formed by simultaneous rolling with good profitability for mass production. This is because the respective outer diameters are adjusted to the outer diameters corresponding to the effective heights of the threads to be finally finished, and in exceptional cases, the respective threads may be cut and formed.

Further, as the external shape suitable for tapping and drilling in the tapping main body portion 14 including the tapping introducing portion 15, in addition to the above-mentioned shape mainly having a circular cross section such as a gimlet shape or a taper shape, it is well known. Thus, for example, a substantially circular cross-section having a plurality of arc-shaped ridge corner portions at equal angular intervals on the same circumference, such as an ellipse, a triangle, a quadrangle, etc. in which each ridge corner portion forms an arc surface. Needless to say, the polygonal cross section that is close to the above may be applied not only to the tapping main body portion 14 including the tapping introducing portion 15 but also to the polygonal cross section similar to the substantially circular shape as described above. Depending on the whole material except the head part 12, in this case,
It does not prevent application to the fastening body 13.

With respect to the tapping main body 14, a series of male screws (base of thread) are continuously spiraled from the tapping introduction section 15 on the tip side at a required lead angle θ and a required pitch interval p. A side effective width w _a and an effective height h _a ) are formed by rolling to form a tapping screw thread 21 having a required tapping drilling capability (FIG. 1 (b),
(See the lower left portion of FIGS. 2 and 3). In this case, the number of spiral turns of the tapping screw thread 21 may be about one turn or one and a half turns, which makes it possible to shorten the length of the corresponding portion as much as possible.

Here, as the cross-sectional shape of the tapping screw thread 21, the shape of the internal thread portion tapped by the tapping screw thread 21 is suitable for screwing a self-locking screw thread described below. It is only necessary to be able to achieve the above actions, and the embodiment of the screw thread having a substantially triangular cross section as shown in the figure is an example thereof. On the other hand, in order to easily and effectively make a tapping cut with respect to the tapping introducing portion 15, and thus the tapping screw thread 21 at the leading end of the introducing side, as is well known, a slitting portion, a gouging portion, etc. The tapping cutting blade portion 22 is formed by grinding (see FIG. 1B).

Further, with respect to the fastening main body portion 13, the same lead angle θ continuous with the tapping screw thread 21,
Further, by rolling up and rising at the same pitch interval p so as to be coincident with the extension line of the spiral direction, the spiral thread can be continuously screwed into an internal thread portion to be described later to be drilled by the tapping screw thread 21. Male screw (based on the effective width w _b on the base side of the thread and the effective height h _b , in this case, w _a = w
_b, h _a ≒ h _b) is formed in a shape, the male thread shape of a continuous thread crest bisecting the notches 33 of the required depth, which along a helix of a pair screwing the screw top 32, 32
Then, the pair of threaded screw tops 32, 32 are slightly expanded to both sides orthogonal to the continuous direction of the cut groove 33 (expansion amount = 2δ, the tip end of the screw thread corresponds to the threaded screw top). 32, 3
By forming the shape so that the effective distance between the two is δ + w _b + δ), the required spring resilience (in this case, corresponding to the expansion amount 2δ) toward the cut groove 33 side which is a direction approaching each other. ) Is applied to form a self-locking screw thread 31 (see FIG. 1B, the upper left portion of FIGS. 2 and 3).

Here, in the self-locking screw thread 31 formed by rolling in this way, the self-locking screw thread 31 with respect to the cross-sectional shape of the internal thread portion tapped by the tapping screw thread 21 is formed. The cross-sectional shape of the crest 31 substantially overlaps with each other by an amount corresponding to the expansion of the screwing screw tops 32, 32 (see the right side portion of FIG. 3). Considerable amount
It is elastically deformed to the cut groove 33 side at the time of screwing and fastening, and plays a role of self-locking as expected.

Further, the divided threaded screw tops 3 of the self-locking screwed threads 31 branching from the tapping screw tops 22 of the tapping threads 21 and continuing.
Within the required range including the branch portion with 2 and 32 (or within the required range with the rear end part of the tapping screw top portion 22 and the front end portion of each screw thread top portion 32, 32 including the branch portion, if necessary) The outer diameter of the self-locking screw thread 31 is formed to be slightly smaller than the outer diameter of each required range, so that the self-locking screw thread 31 is screwed and fastened to a female screw portion to be tapped. You can do it effectively.

On the other hand, with respect to each member fastened to each other by the self-locking tapping screw member 11, for example, a fastening hole 42 having an inner diameter capable of receiving the self-locking screw thread 31 is previously formed on the fastened member 41. A small-diameter lead pilot hole 52 for drilling positioning is formed in advance in the threading target member 51 as needed (see FIG. 4A).

Here, as described above, the tapping screw thread 21 has a substantially triangular cross section, and depending on the tapping screw thread 21, the known tapping screw thread 21 is used for the lead pilot hole 52. As described above, the intended tapping screw groove portion having the corresponding cross-sectional shape, that is, the female screw portion 53 is drilled.

Next, a case will be described in which the fastened member 41 is screwed and fastened to the screwing target member 51 by using the self-locking / tapping screw member 11 according to the configuration of the first embodiment.

That is, at the time of this screw-fastening, the self-locking tapping screw member 11 is inserted into the fastening hole 42 of the fastened member 41, and the tapping screw thread 21 of the self-locking tapping screw member 11 is formed in the lead pilot hole 52 of the screwing target member 51. When the self-locking tapping screw member 11 is strongly screwed in the state of being bitten into Are excavated (see the cross sections of FIGS. 4B and 4C).

Then, with the completion of the tapping cut, the self-locking screw thread 31 first starts screwing simultaneously with the cut female thread portion 53 (see FIG. 4 ( See section c)). Then, when the self-locking screw thread 31 is screwed into the female screw portion 53, each screw thread top portion 32 expanded by 2δ in the self-locking screw thread 31. 32 are gradually deformed and elastically deformed while being gradually compressed and compressed toward the cut groove 33 side against their own spring resilience, and as a result, the pressing force due to the elastic deformation is always maintained. In the actuated state, the self-locking screw thread 31 is screwed and fastened to the female screw portion 53, and further, the fastening target member 41 is fastened to the target screwing target member 51 (Fig. Four
(See section (d)).

Therefore, in the state where the self-locking and tapping screw member 11 has been screwed and fastened in this manner, the self-locking screw is screwed to the female screw portion 53 formed by tapping and drilling the screwing target member 51. On the basis of the threaded engagement of the threaded screw tops 32, 32 on the ridge 31, the strong locking action in the tightened state is automatically obtained. On the other hand, even if the self-locking / tapping screw member 11 is unscrewed from the female screw portion 53 against the applied elastic deformation force, the elastic deformation is only restored once. By screwing, it is possible to screw with similar elastic deformation,
The self-locking tapping screw member 11 can be sufficiently screwed and reused here.

In the first embodiment, the self-locking screw thread 31 is formed by aligning the tapping screw thread 21 with the same pitch interval p on the extension line of the spiral direction. However, it is not always necessary to form them in a limited manner as described above, and substantially the same action and effect can be obtained even if they are formed at different pitch intervals or off the extension line of the spiral direction.

Second Embodiment FIGS. 6A and 6B show a screw material for forming a self-locking tapping screw member to which a second embodiment of the present invention (corresponding to claim 3) is applied. FIG. 7 is a side view and an external side view showing the outline of the formed self-locking and tapping screw member. FIG. 7 is a view showing the same self-locking tapping screw member from the tapping main body portion to the fastening main body portion via the fastening introduction portion. It is the plane development view which expands and shows typically the mode of the tapping screw thread and the self-lock screwing screw thread which included the starting part, and the partial sectional view which expands and shows each each main part same as the above. .

That is, also in the embodiment of the second embodiment shown in FIGS. 6 and 7, the self-locking tapping screw member 111 is constructed by tightening as in the case of the first embodiment. With a positive groove for operation A head body part that takes any arbitrarily selected means such as round head, flat head shape or hexagonal head shape, for example, in this case, with a positive groove that can be tightened by a required plus driver And has a head body portion 112, which is connected to the inside of the head body portion 112 to form a fastening screw portion, and, as will be described subsequently, corresponds to the effective height of the thread to be threaded formed on the fastening screw portion. The required outer diameter D _b1 is set to a circular cross section, and the tip end side is gradually tapered to an outer diameter D _{b2 of} about the effective depth of the screw thread, forming a taper shape. Forming the fastening introduction portion 114 for raising the compound thread The fastening main body 113 and the tapping screw portion connected to the tip end side of the fastening introducing portion 114 to form a tapping screw portion, and, as described below, similarly, the effective tapping screw thread formed on the tapping screw portion is formed. Required outer diameter D _a1 set according to height (however, D _b1 <D
_(a1 ) A screw material 111a having a circular cross-section and a tapping main body 115 in which at least a tapping introducing portion 116 having an outer shape suitable for tapping excavation such as a gimlet shape or a taper shape is formed at least on the tip side is used ( Figure 6
(A)).

The setting of the required outer diameters D _b1 and D _a1 of the fastening main body 113 and the tapping main body 115 including the tapping introducing portion 116 is the same as in the case of the first embodiment. In addition, the tapping introducing unit 116
The same applies to the outer shape suitable for tapping and drilling.

Further, with respect to the tapping main body portion 115, the tapping introduction portion 116 on the tip end side is rolled so as to be coincident with the extension line in the spiral direction by the required lead angle θ and the required pitch interval p. A tapping screw thread 21 which is formed into a series of continuous male threads (effective width w _a1 on the base side of the screw thread and effective height h _a1 ) which is continuous in a spiral shape by giving rise to the required tapping drilling ability is formed. Rolling is performed (see FIG. 6B and the lower left portion of FIG. 7).

Here, also in the cross-sectional shape of the tapping screw thread 121, as in the case of the first embodiment, the internal thread shape tapped by the tapping screw thread 121 has a self-locking screwing described below. Any material can be used as long as it is suitable for screwing threads together and can achieve the intended effect.

With respect to the fastening main body 113,
Unlike the case of the first embodiment, from the fastening introduction portion 114 interposed between the tapping body portion 115 and the tapping screw thread 121, the same lead angle as the tapping screw thread 121 is provided. The tapping screw thread 121 is formed by rolling and starting up so as to match the extension line of the spiral direction with θ and the same pitch interval p.
A helically continuous male screw (in the base side effective width w _b1 and effective height h _b1 of the thread, w _a1 = w _b1 , h _a1 −Δh _a1 = h _b1 )
In addition to being formed into a shape, the continuous screw crests of the male screw shape are divided into two by a cut groove 133 of a required depth along the spiral to form a pair of screw thread crests 132, 132, and then the pair of screw claws are formed. Here again, the compound screw tops 132, 132 are similarly slightly expanded to both sides orthogonal to the continuous direction of the notch groove 133 (expansion amount = 2δ, between the screw thread tops 132, 132 corresponding to the tip of the thread). By shaping the effective spacing δ + w _b2 + δ), the required spring resilience (corresponding to the expansion amount 2δ in this case as well) is directed toward the cut groove 133 side which is a direction in which they approach each other. The given self-locking screw thread 131 is formed by rolling (FIG. 6 (b),
And the upper left part of FIG. 7).

Here, in the self-locking screw thread 131 formed by rolling in this way, the self-locking screw thread is formed with respect to the cross-sectional shape of the female screw tapped by the tapping screw thread 121. Mountain 131
The cross-sectional shape of each of the screw thread tops 132, 13 is substantially
The two corresponding expansion portions are overlapped with each other, and the mutual expansion equivalent portions are elastically deformed toward the cut groove 133 side at the time of screwing and fastening, and function as self-locking as expected. To achieve.

On the other hand, regarding each member fastened to each other by the self-locking tapping screw member 111,
This may be exactly the same as the case of the first embodiment, and the tapped screw thread 121 is used to cut the female thread portion 53 in the lead pilot hole 62 also in this case.

Subsequently, by using the self-locking tapping screw member 111 according to the configuration of the second embodiment, the member 41 to be fastened is screwed to the screwing target member 51, as in the case of the configuration of the first embodiment. The case of concluding will be described. This screw-fastening is basically the same as in the case of the configuration of the first embodiment, and is not particularly shown.

That is, at the time of this screw-fastening, the self-locking tapping screw member 111 is inserted into the fastening hole 42 of the fastened member 41, and the tapping screw thread 12 is formed.
When the self-locking tapping screw member 111 is strongly screwed in the state in which 1 is engaged in the lead pilot hole 52 of the screw target member 51, first, the lead is attached to the screw target member 51. A female screw portion 53 concentric with the prepared hole 52 is drilled.

Then, with the completion of the tapping excavation, first of all, with respect to the female thread portion 53, a portion raised from the tapered small-diameter portion of the fastening introduction portion 114 with the self-lock screw thread 131. Start screwing. Also in this case, since the rising portion is included in the forming range of the female screw 53, it can be sufficiently screwed. Subsequently, when the self-locking screw thread 131 is screwed into the female thread portion 53, the screw thread tops 132 are expanded by the amount of 2δ in the self-locking screw thread 131. , 132
However, it is elastically deformed while being gradually compressed and compressed toward the cut groove 133 side against its spring resilience, and is strongly screwed. As a result, the pressing force accompanying the elastic deformation also acts. In this state, the self-locking screw thread 131 is screwed and fastened to the female screw 53, and the fastening target member 41 is effectively fastened to the screw target member 51.

Therefore, in the state where the screw-fastening by the self-locking tapping screw member 111 is completed in this way, the self-locking screw thread 131 is attached to the female screw 53 tapped on the screwing target member 51. On the basis of the threaded engagement with the elastic deformation of the threaded screw tops 132, 132, the strong anti-loosening action is automatically obtained here, just as in the case of the first embodiment. is there.

Also in the second embodiment, the tapping threads 121 formed on the self-locking tapping screw member 111 are aligned at the same pitch interval p on the extension line of the spiral direction. Although the self-locking screw thread 131 is formed by this, substantially the same action and effect can be obtained by forming the self-lock screw thread 131 also at different pitch intervals or off the extension line of the spiral direction.

In each of the first and second embodiments, when the self-locking tapping screw member of the present invention is used to fasten a fastened member to be fastened to a screwing target member as shown in FIG. However, the present self-locking tapping screw member is not necessarily limitedly applied only in such a mode, and the self-locking screw thread has a compression compression between the screw thread tops. By effectively utilizing the strong fastening action in the arbitrary screwing position associated with the above, for example, as shown in FIG. 8, the height at which any member, component 212 or the like can be adjusted with respect to the mounting substrate 211 or the like. The same effect can be obtained when the device is mounted and supported at a position, and a sufficient effect can be obtained.

[0057]

As described above in detail with respect to each embodiment, according to the self-locking tapping screw member according to the first aspect of the present invention, the fastening screw portion is connected to the tightening head body portion. And a tapping main body having a tapping screw portion connected to the fastening main body and having a tapping introducing portion formed on the tip side thereof. The tapping threads formed in the external thread shape and giving the tapping drilling ability at the lead angle and the pitch interval are provided, and the same lead angle and pitch interval are continuously applied to the tapping thread with respect to the fastening main body. A male screw shape is formed, and the male screw shaped screw crest is bisected by a notch having a required depth along a spiral to gradually branch from the tapping screw crest of the tapping screw thread. After forming a pair of spiral screw crests, slightly expand each spiral screw crest individually in the direction orthogonal to the cut groove, and move to the cut groove side between the screw thread crests. Since the self-locking screw thread provided with the spring function is provided, the self-locking screw thread is formed on the female screw following the formation of the required female screw by the required tapping drilling on the member to be fastened by the tapping screw thread. The screw thread, and by extension, the self-locking screw thread with a pair of screw thread tops can be loosely locked and screwed against the elasticity of the thread while applying a spring force. Despite its extremely simple structure, the member itself can easily hold the self-locking function with a single material, and in addition to the tapping screw's internal thread drilling function, the required looseness Screw by stopping action Fastening can be achieved easily, and the member itself can be reused after it has been unscrewed once, and moreover, chips, etc., generated when the tapping screw hole is drilled by the tapping screw thread are self-locking screw threads. It is possible to effectively exhibit various practically excellent features such as the advantage that the self-locking screwing can be surely performed without intruding into the notch groove.

Further, according to the self-locking and tapping screw member of the present invention, the fastening head portion is connected to the fastening head portion to form the fastening screw portion, and the fastening introduction portion is formed on the tip side. The tapping main body is provided with a tapping main body which is connected to the fastening main body and serves as a tapping screw portion, and a tapping introduction portion having a required shape is formed on the tip side of the tapping main body. A tapping screw thread, which is formed in a continuous spiral thread shape with a lead angle and pitch interval and gives the required tapping drilling ability, is provided. From the side, a male screw shape having the same lead angle and pitch interval as the tapping screw thread is formed, and the screw top portion excluding the corresponding portion is introduced along the spiral. A pair of threaded screw tops that are gradually branched from the introduction applicable portion are formed by dividing the threaded groove into two parts by depth, and then the individual threaded screw tops are individually divided in a direction orthogonal to the cut groove. Since the self-locking screw thread provided with the spring function to the cut groove side is provided between the screw screw tops by expanding it slightly, the same effect as in the case of claim 1 can be obtained. In addition, here, the tapping thread and the self-locking thread are individually independent by the fastening introduction section interposed between the tapping body section and the fastening body section. And it can be formed easily.

[Brief description of drawings]

FIG. 1 is a self-locking device to which a first embodiment of the present invention is applied.
A side view showing a screw material for forming a tapping screw member (Fig. (A)) and a self-locking member formed by the same.
It is an appearance side view (the same figure (b)) which shows the outline of a tapping screw member.

FIG. 2 is an enlarged schematic view showing an aspect of a tapping screw thread formed from a tapping main body portion of a self-locking tapping screw member to a fastening main body portion and a self-lock screw thread including a rising portion. FIG. 2 is a plan development view and an enlarged partial cross-sectional view of main parts of the same.

FIG. 3 is an explanatory diagram showing a mutual relationship between the cross section of the tapping screw thread and the cross section of the self-locking screw thread.

FIG. 4 is an explanatory view sequentially showing operation modes of tapping excavation and screwing fastening.

FIG. 5 is a partial cross-sectional view showing a state of self-locking screw-fastening to a female screw portion by tapping excavation.

FIG. 6 is a self-locking device to which the second embodiment of the present invention is applied.
A side view showing a screw material for forming a tapping screw member (Fig. (A)) and a self-locking member formed by the same.
It is an appearance side view (the same figure (b)) which shows the outline of a tapping screw member.

FIG. 7: Same as above, with the tapping body of the self-locking and tapping screw member, the form of the tapping screw thread formed on the fastening body part through the fastening introduction part and the self-locking screw thread including the rising portion are enlarged. FIG. 2 is a plan development view schematically showing the above, and an enlarged partial sectional view of each main part.

FIG. 8 is an external view schematically showing another application example of the self-locking tapping screw member according to each embodiment of the present invention.

[Explanation of symbols]

11,111 Self-locking tapping screw member 12,112 Head body part with plus groove 13,113 Fastening body part D _b , D _b1 Outer diameter of the part that becomes the fastening body part of the screw material 14,115 Tapping body part 114 Fastening Introductory part D _a , D _a1 Outer diameter of the part that becomes the tapping main body of the screw material 15,116 Tapping introductory part 21,121 Tapping screw thread 22,122 Tapping screw top θ Thread lead angle p Thread pitch interval w _a , w _a1 base side effective width of thread h _a , h _a1 thread effective height 31, 131 self-lock screw thread w _b , w _b1 base side effective width h _b , h _b1 thread amount of expansion _{δ + w b + δ, δ} + w b2 + δ effective spacing between screwed thread crest 33, 133 notches 41 workpieces fourth effective height 32,132 screwed thread crest 2δ screwing the screw top of the Fastening hole 51 screwed target member 52 lead pilot holes 53 tapped 穿削 been internally threaded portion

Claims (12)

[Claims] 1. A tightening head part, a tightening body part connected to the tightening head part to form a tightening screw part, and a tightening head part connected to the tightening body part to form a tapping screw part, and to the tip side. A tapping main body formed with a tapping introduction portion, wherein the tapping main body portion is formed into a male screw shape at a predetermined lead angle and pitch from the side of the tapping introduction portion and has tapping drilling ability. A thread is provided, and in the fastening body section, a male screw shape having the same lead angle and pitch interval is formed continuously with the tapping screw thread, and then a required depth of the male screw shape along the spiral is formed. A pair of threaded screw tops that are gradually branched from the tapping screw top of the tapping screw thread by dividing them into two by the cut groove of That somewhat by expanding direction, self-locking-tapping screw member, characterized in that a self-locking screwing thread gave spring function to cut grooves side therebetween of the respective threaded screw top. 2. A tapping screw crest of the tapping screw crest and each sectioned screw thread crest of the self-locking screw crest branching from the tapping screw crest, each screwing including at least a branch portion. The outside diameter within the required range on the screw top side, or the outside diameter within the required range on the top side of each screw thread, including a part of the top side of the tapping screw and the branch portion, is the tapping screw top side and each screw thread. The self-locking tapping screw member according to claim 1, wherein the self-locking tapping screw member is formed to have a diameter slightly smaller than an outer diameter of the top portion outside each required range. 3. A tightening head body portion, a tightening body portion connected to the tightening head body portion to form a tightening screw portion, and a tightening body portion having a tightening introduction portion formed on the distal end side, and connected to the tightening body portion. A tapping screw portion, and a tapping main body portion having a tapping introduction portion formed on the tip side thereof, wherein the tapping main body portion is formed in a male screw shape with a predetermined lead angle and pitch interval from the tapping introduction portion side. A tapping screw thread having tapping drilling capability is provided, and in addition to the tapping screw thread, the fastening body portion has a male screw shape having the same lead angle and pitch interval as the tapping screw thread from the fastening introduction portion side. After forming
Introducing the male screw shape, the screw top is divided into two by a notch groove of a required depth along the spiral to form a pair of screw thread tops, and the divided screw thread tops are divided. A self-locking screw thread, which is slightly expanded in a direction orthogonal to the cut groove, and is provided with a self-locking screw thread provided with a spring function toward the cut groove between the screw thread tops. Tapping screw member. 4. The tapping introducing portion has a slotted portion, a gouging portion and the like for forming a tapping cutting blade portion on the tapping screw thread, which are machined from the tip end side. The self-locking tapping screw member according to any one of 1 to 3. 5. The number of spiral turns of the tapping thread is:
The self-locking tapping screw member according to any one of claims 1 to 3, wherein the number of turns is relatively small, such as one turn or one and a half turns. 6. The self-locking device according to claim 1, wherein the fastening body portion and the tapping body portion including the tapping introduction portion have a circular cross-sectional shape. -Tapping screw member. 7. The cross-sectional shape of the fastening body portion and the tapping body portion including the tapping introduction portion is formed in a polygonal shape having a plurality of arcuate ridge corner portions at equal angular intervals on the same circumference. The self-locking tapping screw member according to any one of claims 1 to 5, wherein 8. The cross-sectional shape of the tapping main body including at least the tapping introduction portion among the fastening main body and the tapping main body including the tapping introduction portion has a plurality of arc surfaces at equal angular intervals on the same circumference. The self-locking tapping screw member according to any one of claims 1 to 5, wherein the self-locking tapping screw member is formed in a polygonal shape having a rounded corner portion. 9. The self-locking tapping screw member according to claim 3, wherein the self-locking screw threads are formed at the same pitch interval with respect to the tapping screw threads. 10. The self-locking tapping screw member according to claim 3, wherein the self-locking screw thread is formed so as to coincide with an extension line of the tapping screw thread in a spiral direction. 11. The self-locking tapping screw member according to claim 3, wherein the self-locking screw threads are formed at different pitch intervals from the tapping screw thread. 12. The self-locking tapping screw member according to claim 3, wherein the self-locking screw thread is formed on a line extending in a spiral direction of the tapping screw thread.