CN101054991B - Self-tapping type bolt for fastening brittle workpiece - Google Patents
Self-tapping type bolt for fastening brittle workpiece Download PDFInfo
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- CN101054991B CN101054991B CN2007100961545A CN200710096154A CN101054991B CN 101054991 B CN101054991 B CN 101054991B CN 2007100961545 A CN2007100961545 A CN 2007100961545A CN 200710096154 A CN200710096154 A CN 200710096154A CN 101054991 B CN101054991 B CN 101054991B
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Abstract
The invention provides a self-tapping type bolt having axis (1). A trumpet head (2) is set in the butt end of the axis (1) and forms a pointed nose (3) in the front-end of the axis (1). The outside diameter of the minor diameter part (8) in the axis (1) continuing to the pointed nose (3) is different to the outside diameter of the major diameter (7') continuing to the head (2). There are two threads (4, 5) formed in the minor diameter part (8), and there is one thread (4) formed in the major diameter (7'). So threaded portion is divided into double thread part (6) and single thread part (7). The heights of the threads (4, 5) composing the double thread part are different. The self-tapping type bolt is mostly used to fasten the plasterboard to the frame (13).
Description
Technical field
The present invention relates to a kind of fastening self-tapping type bolt of gypsum board that is suitable for.In the following description, single self-tapping type bolt is abbreviated as " screw ".
Background technique
Self-tapping type bolt roughly is divided into the tip formula of front end point and the drill bit formula that front end is provided with band cutting blade bit head according to the form of its front end.The screw of the former tip formula is representative with the wood screw.Tip formula screw is by being strutted the tissue of parts by its front end, make axle enter parts, is used for tightening various workpiece at soft material systems such as timber base material or as the sheet metal system base material of 0.5～0.8mm left and right thickness more.
Drill bit formula screw is used for tightening various workpiece at steel plate system base material usually, for example tightens steel plate system workpiece or tightens wooden workpiece at the steel base material at steel plate system base material.Certainly, also be used in as soft materials such as wood substrates and tighten workpiece (for example, the spy of Japan opens the 2002-31115 communique).
No matter which kind of type of screw had all proposed various evolutionary approach in the past.For example,, on axle, form two worm tooths, proposed various improvement projects on the basis with this pair engage thread about tip formula screw.Its example as shown below.
For example, the spy of Japan opens the screw of putting down in writing in the 2001-200822 communique, its screw section integral body is made of two worm tooths, wherein a certain scope of something or somebody to fall back on one side of screw section forms the equal contour portion of height (or external diameter) of two worm tooths, with respect to contour part formation and two different high portions that the worm tooth height is different near forward end of screw section.
In addition, Japan speciallys permit the screw of No. 3334563 communique record, under the situation that screw section integral body is formed by two worm tooths, helical thread portion is the path parallel thread portion that is positioned at forward end, the big footpath parallel thread portion that is positioned at a side and the described path parallel thread of smooth connection portion and big directly these three parts of intermediate thread portion of the undergauge shape of parallel thread portion.
In addition, No. 3413828 disclosed screw of communique of Japan's special permission, under the situation that screw section integral body is formed by two worm tooths, the epimere screw section of the straight line shape that helical thread portion is the hypomere screw section that is positioned at the straight line shape of forward end, be positioned at a side and be positioned at these three parts of screw section, stage casing between described hypomere screw thread and epimere screw thread, in addition, the external diameter of screw section is set with the relation of " external diameter of the external diameter of the external diameter of hypomere screw section＜screw section, stage casing＜epimere screw section ".
In addition, the screw of No. 3487210 communique record of Japan's special permission, under the situation that screw section integral body is formed by two worm tooths, form the high large-diameter portion of height of worm tooth in minor diameter part that the height of a certain scope formation worm tooth of the forward end of screw section is extremely low and the screw section near the part of a side than described minor diameter part.
In addition, Japan speciallys permit No. 3060284 disclosed screw of communique to have the single start thread portion that is positioned at forward end and is positioned at the two screw sections near a side than this single start thread portion, the external diameter of single start thread portion is set at littler than the external diameter of two screw sections, in addition, the height of the worm tooth of the two screw sections of the aspect ratio of the worm tooth of single start thread portion is much lower.
The spy of Japan opens clear 60-23614 communique and the spy opens the disclosed screw thread of flat 9-273526 communique, and axle forms and minor diameter part that is positioned at forward end and the different diameter of large-diameter portion that is positioned at a side, and a worm tooth extends on minor diameter part and the large-diameter portion always.
One of purposes of self-tapping type bolt is to be fastened on the framework (may also be referred to as base material) constituting the wall of building or the gypsum board of ceiling board.As with the in the past timber that use of the fastening framework on it of gypsum board more, in recent years, be to improve refractory nature and long-life property, use is about sections about 0.5～0.8mm by thickness and is the framework that the sheet metal of C shape is roughly made more.The screw that Japan speciallys permit No. 3060284 communique is developed the framework that is applicable in sheet metal system and tightens gypsum board, and the purpose of this invention is to prevent when the axle of screw enters framework owing to impact and cause frame deformation.Specifically, the invention of this communique passes through the forward end of screw section is formed the single start thread portion of path, thereby reduces the resistance of knocking in respect to framework.
In addition, described spy opens the screw of 2001-200822 communique, No. 3334563 communique of special permission, No. 3413828 communique of special permission, No. 3487210 communique of special permission, No. 3060284 communique record of special permission, its screw section integral body has two screw threads, perhaps, optimum range in the forward end of screw section has a screw thread, and other parts have two screw threads.And, which kind of situation no matter, the part that will have two screw threads is screwed into base material, so that workpiece is fastened on the base material.But, in this kind formation in the past, when workpiece is as brittle materials such as gypsum boards, then have the excessive tissue of workpiece to crumble, or the opposite threads tooth is to the anxiety of the grip decline of base material.
Summary of the invention
Given this plant present situation, the object of the present invention is to provide a kind of self-tapping type bolt of improvement more.
Self-tapping type bolt (Zi Ji Jin of the present invention goes into formula ね じ), it is used for the workpiece that is made of crisp material that gypsum board is such and is fastened to base material, have the transverse section and be circular axle and the head that is provided with continuously with this cardinal extremity, the front end with a described opposite side of described axle forms the self tapping portion that enters parts in the mode that does not have bottom outlet, the pointed nose that this self tapping portion is a pointization foremost or for the band cutting blade bit head, on described axle, form the worm tooth of engaging-in parts, described head has ladder taper shape portion, the external diameter of this ladder taper shape portion becomes big from the part that links to each other with described axle to end face, on the end face of described head, form and tighten the embedding part that part embeds, wherein, described axle have with the continuous minor diameter part of described self tapping portion and with described continuous large-diameter portion, described minor diameter part and large-diameter portion form continuously via diameter reducing part, on described minor diameter part, form two worm tooths, i.e. first worm tooth and second worm tooth, in these two worm tooths only first worm tooth extend near the described head, make the minor diameter part of described axle become two screw sections, large-diameter portion forms single start thread portion, the outside dimension of described single start thread portion greater than or be substantially equal to the maximum outside diameter size of two screw sections.
Among the present invention, get at specified structure and to use " equating " speech on basic, still so-called herein " equating " do not mean that equally fully, also comprise about equally.In addition, when making goods, what all have machining error when actual.In addition, screw is used for an object and another overlapped object and fastening mutually, and still, in this specification, an object of being pushed down by the head of worm tooth is called workpiece, and workpiece is overlapping is called base material.In addition, " parts " comprise workpiece and base material.
One of the advantage that the screw section has the self-tapping type bolt of two screw threads is the lead angle that can increase worm tooth, and therefore screwing in operation can promptly carry out.And, among the present invention, two screw sections are positioned at forward end, therefore, when being fastened on workpiece on the base material, two screw sections are introduced into workpiece and base material, but because the pitch of two screw sections diminishes, so screw have the attitude stability that has good stability (big if worm tooth is one and lead angle, the balance variation when then screwing in, screw is the tendency that will topple over.)。
In addition, if worm tooth integral body is two screw threads, then because the entering of worm tooth, the tissue of parts (workpiece and base material) has excessively and crumbles, or the anxiety of excessive deformation (particularly workpiece is under the situation of gypsum board, and crisp organization table reveals the phenomenon that significantly crumbles), but in the present invention, part in the screw section near head is a single start thread portion, therefore, can prevent that parts from excessively crumbling and excessive deformation.
In addition, in the present invention, bolt axis is a minor diameter part in the part near front end, and the part of close head is a large-diameter portion, therefore by the engaging-in securely parts of large-diameter portion (particularly workpiece), also can prevent the phenomenon that crumbles of parts.
Sum up above some, the present invention can prevent crisp material workpiece crumble or excessive deformation in, screw promptly can be screwed into posture accurately.
As previously discussed, the self tapping portion of screw of the present invention comprises tip formula and two kinds of situations of drill bit formula.Usually, when the material of base material is timber or the steel plate below the 0.8mm, use the tip formula, when base material is material with the steel plate that is thicker than 0.8mm, use the drill bit formula.Certainly, this difference only is a suggestion benchmark, and which kind of is selected by the user in actual use.
Other features and optimal technical scheme
The present invention comprises other features and several optimal way of following narration.One of other features relate generally to the structure of head.Promptly, in first optimal way, constitute the profile in the positive front elevation in longitudinal section that the bottom surface of the ladder taper shape portion of described head cuts off on by the plane that comprises the axle center, the seat surface that constitutes the conoid type portion of described head is shaped as has the visible outline of the bending of outer depression outwardly, thereby therefore described capitiform becomes to have the front end similar shapes with similar loudspeaker.The shape of this kind head just was acknowledged as in the past and was suitable for the fastening screw of using of gypsum board.Why this trumpet-shaped head is suitable for the fastening of gypsum board is because the gypsum board surface portion tissue that head causes crumbles seldom, and the bottom surface of head and the area of contact of gypsum board are big, and be strong thereby head compresses the function of gypsum board.
The ladder taper shape portion that forms head main body possesses the outwardly directed flat lip part of periphery by the terminal of this ladder taper shape portion, and the external diameter of this lip part is 2.5～3.5 times of maximum outside diameter of worm tooth.
On the Screw as wood screw, usually the external diameter of head is 2 times of maximum outside diameter (maximum outside diameter of this screw section is generally the external diameter of screw thread) of screw section, but in the present invention, the external diameter of head is more than before, thereby the function of pushing down workpiece is very strong.And head is not in the whole big footpathization of ladder taper shape portion, but carries out big footpathization by lip part is set, and therefore, not organizing of workpiece can excessively crumble.Increase the pressured area of workpiece and do not cause excessively crumbling of workpiece by this kind, can obtain high fastening strength.
At gypsum board with under the situation of screw, if if the external diameter of lip part is littler than 2.5 times of degree of the external diameter of screw section, Tou pressured function deficiency then, if perhaps above 3.5 times, then lip part is difficult to be absorbed in the inside of gypsum board.In the experiment, optimum when the external diameter of lip part is 3 times of left and right sides of screw section external diameter.
In recent years, the recycling of various fields developed, even gypsum board is also pulverized discarded gypsum board, and sneaked into pure (バ one ジ Application) raw material.This kind sneaked into the gypsum board ratio that utilizes product again and only used the crisp of pure raw material.In addition, gypsum board has the tendency of attenuation, and this thin typeization causes the intensity of this gypsum board low.In the present invention, head can pressured securely workpiece and do not cause excessively crumbling, and therefore, also is suitable for sneaking into the gypsum board that utilizes product again or approaches (for example thick 6～10mm) gypsum boards.
As other features of the present invention, comprise the suitable form of a last screw section.That is, in the present invention, have in vain between the root of adjacent worm tooth at interval.In other words, in the front elevation of longitudinal section, between the root of adjacent worm tooth, there is tabular surface in the lowest point part.According to this feature, suppressed because excessively the crumbling of the parts that worm tooth causes.Thereby, be suitable for as soft workpiece such as gypsum boards.
First optimal way of the present invention also comprises the design about the worm tooth external diameter.That is, in the described invention of this first mode, the external diameter of minor diameter part place first worm tooth of described axle is greater than the external diameter of second worm tooth, and the external diameter of first worm tooth of large-diameter portion is greater than the external diameter of first worm tooth of minor diameter part.
In this first optimal way, the external diameter that first worm tooth is located in big footpath is greater than the external diameter of minor diameter part, and therefore, first worm tooth screws in workpiece securely at the large-diameter portion place, and fastening function further improves.In addition, the external diameter of first worm tooth of minor diameter part is lower than the external diameter of second worm tooth, and therefore, the workpiece that is caused by second worm tooth crumbles less, and, can reduce the resistance that is screwed into respect to parts (workpiece and base material).
Second optimal way of the present invention comprises that the external diameter of first worm tooth of the minor diameter part of axle equates formation with the external diameter of second worm tooth.Even at this second optimal way, the outside dimension of first worm tooth of the large-diameter portion also outside dimension than two worm tooths of minor diameter part is big.This second mode can be brought into play the advantage that equates substantially with first mode.
As the distinctive advantage of second optimal way, first worm tooth equates (in other words height of thread equates) with the external diameter of second worm tooth, so, can suppress screw rocking when parts screw in.That is, because two height of threads equate, so when two worm tooths entered parts (workpiece, base material), the screw-in resistance of two worm tooths equated, thereby, prevent the swing of axle, screw (axle) is vertically squeezed into.
First optimal way and second optimal way can be attached to first mode, and the screw of this kind combination is very suitable for carrying out the crisp material workpiece as gypsum board fastening.
The present invention by the mode of execution of following narration can be more accurate understanding.
Description of drawings
Fig. 1 is the structural drawing of the expression first mode of execution structure, (A) is front elevation, (B) for schematically illustrating the front elevation of worm tooth, (C) for omitting the front elevation of worm tooth state, (D) is planimetric map.
Fig. 2 is a part sectioned view.And the hatching of expression section only partly illustrates among Fig. 2.
Fig. 3 is the user mode of the described screw of expression first mode of execution, (A) for being screwed in the way, (B) for being screwed into the state of end.
Fig. 4 is the structural drawing of the expression second mode of execution structure, (A) is front elevation, (B) is planimetric map, is the front elevation that omits the state of worm tooth (C), (D) is part sectioned view.(D) hatching of expression section only partly illustrates in.
Fig. 5 is the user mode figure of expression second mode of execution, (A) for being screwed in the way, (B) for being screwed into the state of end.
Fig. 6 is the partial front figure of second mode of execution.
Fig. 7 represents the 3rd mode of execution, schematically illustrates worm tooth.
(A) expression the 4th mode of execution among Fig. 8, (B) expression the 5th mode of execution
Among the figure,
The 1-axle; The 2-head; 3-is as the pointed nose of self tapping portion one example; 3 '-as the bit head of self tapping portion one example; 4-first worm tooth; 5-second worm tooth; The two screw sections of 6-; 7-single start thread portion; 7 '-large-diameter portion; The 8-minor diameter part; The 9-diameter reducing part; 10-is as the cross cave of embedding part one example; 12-is as the gypsum board of crisp material workpiece one example; 13-is as the sheet metal system framework of base material one example.
Embodiment
Next based on accompanying drawing embodiments of the present invention are described.
The structure of (1) first mode of execution
The described structure of first mode of execution is shown in Fig. 1～2.Screw have section configuration for circular axle 1 with link to each other with the cardinal extremity one of axle 12, with front ends formation axle 1 and 2 an opposite side the pointed nose 3 of pointization foremost.The conical surface angle [alpha] of pointed nose 3 is set at that (certainly, angle [alpha] can be set arbitrarily about about 25 degree.In addition, though the pointed nose 3 of present embodiment is conical, also can be in the front elevation of longitudinal section, profile is the shell shape of curved surface.)
Form two worm tooths that comprise first worm tooth 4 and second worm tooth 5 on the axle 1.Two worm tooths 4,5 are all from pointed nose 3 (rise), and first worm tooth 4 extends to the end near 2 the neck, and second worm tooth 5 only extends to axle 1 length about half approximately.Thereby, in the screw section that on axle 1, forms, separate the single start thread portion 7 that constitutes first worm tooth and second worm tooth 4,5 and two screw sections of depositing and first worm tooth 5 is only arranged, two screw sections 6 are positioned at the forward end of axle 1.
The starting end of first worm tooth 4 (front end) extends to the front end of pointed nose 3, thereby the starting end of first worm tooth 4 becomes engaging-in 4a.By the engaging-in action of this engaging-in 4a, form axle 1 and enter the initial of portion's material (workpiece, base material).The terminal part height of first worm tooth 4 and second worm tooth 5 all reduces gradually.Among Fig. 1 (A), (B), the terminal of second worm tooth 5 is positioned at the inboard with respect to paper.
In the axle 1 position of two screw sections 6 by the minor diameter part 8 of the certain straight line shape of the pointed nose 3 that forms its front end, external diameter (be that benchmark then is called the paddy footpath with worm tooth 4,5) D1 and external diameter from diameter reducing part 9 formations of minor diameter part 8 to 7 increases of single start thread portion.On the other hand, single start thread portion 7 forms large-diameter portion 7, and its outer diameter D 2 is bigger than minor diameter part 8.Thereby, in the present embodiment, single start thread portion 7 and large-diameter portion 7 ' synonym.
Though not expression among the figure, the large-diameter portion 7 of axle 1 ' in approaching 2 part the part that does not have first worm tooth 4 can be arranged.In addition, second worm tooth 5 also can partly extend to axle 1 large-diameter portion 7 '.The terminal of second worm tooth 5 also can be positioned at than the more close front end of the terminal of minor diameter part 8.Promptly in the application's invention, the whole or part of minor diameter part 8 forms two screw sections 6, large-diameter portion 7 ' all or part of form single start thread portion 7.
The high H1 of tooth of first worm tooth 4 on the minor diameter part 8 and large-diameter portion 7 ' on the high H3 of tooth of first worm tooth 4 be higher than the high H2 of tooth of second worm tooth 5.In addition, first worm tooth 4 removes top portion and terminal part, forms double altitudes.That is, H1 and H3 equate.
And the external diameter of minor diameter part 8 (paddy footpath) D1 is less than external diameter (paddy footpath) D2 of single start thread portion 7 (large-diameter portion 7 '), and therefore, the outer diameter D 3 of first worm tooth 4 is slightly smaller than the outer diameter D 4 of first worm tooth 4 in the single start thread portion 7 in two screw sections 6.Thereby,, then become the relation of D5＜D3＜D4 if the external diameter of second worm tooth 5 is D5 in two screw section 6.In addition, D3 is bigger than the difference of D4 and D3 with the difference of D5.Also have, the outer diameter D 5 of second worm tooth 5 greater than the large-diameter portion 7 of axle 1 ' outer diameter D 2.
In addition, also can increase H3 and any one mode of H1 and make each other size different (these for example put in the mode of execution 2 too).Strictness, first worm tooth 4 and second worm tooth 5 be all according to the position and external diameter is different, but in the present invention outer diameter D 3, D4, D5 mean minor diameter part 8 that axle 1 straight line shape extends and large-diameter portion 7 ' the outside dimension at the high certain place of position upper tooth.
The tooth angle of first worm tooth 4 (angle of tooth) θ 1 is different with the tooth angle θ 2 of second worm tooth 5.Particularly, in the present embodiment, though θ 1 is set at about 30 degree, θ 2 is set at about 60 degree, and angle θ 1, θ 2 natures can be set arbitrarily.In addition, two angle θ 1, θ 2 also can be consistent, become equal angular.
No matter be in two screw sections 6 or single start thread portion 7, the pitch of worm tooth 4,5 is that 2 times of axial width of worm tooth 4,5 are more than the degree.In other words, the lead angle of two worm tooths is much larger than common triangle screw.Thereby, no matter be in two screw sections 6 or single start thread portion 7, the interval of having size E1 to a certain degree in vain between the root of adjacent worm tooth 4,5 (paying the け root).In other words, in the front elevation of longitudinal section, the lowest point of screw thread is a flat condition between the adjacent worm tooth 4,5.The size of space E1 of adjacent worm tooth 4,5 is more than a times of width dimensions E2 of the shirt rim part (full front of a Chinese gown) of worm tooth 4,5 at 6 places, two screw section, is more than three times of width dimensions E2 of shirt rim part of the worm tooth 4 of first worm tooth 4 at single start thread portion 7 places.
2 2a of ladder taper shape portion that have as the export-oriented concavity curved shape of main body.That is, has the 2a of ladder taper shape portion that is similar to horn shape.Form the lip part 2b of planar (or ring-type) continuously in the end one of the 2a of ladder taper shape portion.Form on 2 end face and embed the embedding part of tightening part, for example the cross cave 10.
4 external diameter (say exactly and be maximum outside diameter) D6 of the screw in the present embodiment is bigger than common situation.Promptly, the external diameter of the head in common screw (for example wood screw) is the nominal outside diameter (maximum outside diameter of screw section of screw section, be D4 in the present embodiment) twice about, but in the present embodiment, external diameter (maximum outside diameter) D7 of the 2a of ladder taper shape portion is set at about the twice of nominal outside diameter D4, and the outer diameter D 6 of lip part 2b is set at about 3 times of nominal outside diameter (D4).In addition, the thickness setting of lip part 2b is about 0.6～0.8mm.
(2) user mode
Fig. 3 has represented the user mode of screw.In this example, worm tooth is used for the section configuration that gypsum board 12 is fastened on sheet metal system is roughly the framework 13 of C shape.Fig. 3 (A) is screwed into the sectional drawing of the state of end for screw, and 3 (B) are for being screwed into the sectional drawing in the way.The surface of gypsum board 12 and the inside are posted protective paper 14,15 respectively.
In being screwed into of screw, two screw sections 6 at first enter in the framework 13 from gypsum board 12, and then, single start thread portion 7 enters gypsum board 12 and framework 13.Be screwed under the state of end; first worm tooth 4 of single start thread portion 7 hangs on the inner circumference edge of framework 13; and 2 lip part 2b is absorbed in the inside of gypsum board 12 and (also posts ornamental wallpaper (not shown) on the protective paper 14 on gypsum board 12 surfaces; therefore, 3 need be absorbed in the more inboard of protective paper 14 surfaces).
If under the situation that only has first worm tooth 4,, when axle 1 enters gypsum board 12 and framework 13, have shaking phenomenon and take place because the lead angle of first worm tooth 4 is big.That is, when first worm tooth, 4 engaging-in gypsum boards 12 and framework 13, there is resistance to generate, therefore, axle 1 presents to the tendency of falling with engaging-in position opposite one inclination of first worm tooth 4, but therefore engaging-in position the phenomenon that screw rocks around the axle center occurs because change continuously along with the rotation of axle 1.
At this situation, in the present invention, two screw sections 6 are positioned at forward end, therefore, two worm tooths 4,5 are at the engaging-in gypsum board 12 in both sides and the framework 13 in folder axle center, so, two worm tooths are cancelled out each other with respect to the resistance of gypsum board 12 and framework 13, thereby the shaking phenomenon of screw is inhibited.As a result, the attitude that can be kept upright with respect to the surface of gypsum board 13 of axle 1.
And, if screw section integral body is two screw threads, then worm tooth exceedingly contacts with the tissue of gypsum board 12, thereby excessive tissue crumbles, therefore, generate between gypsum board 12 and screw and become flexible, but in the present invention, close 2 part is a single start thread portion 7 in the screw section, therefore, not organizing of gypsum board 12 can excessively crumble, so gypsum board 12 is fixed securely by the head of screw.
In addition, form on the framework 13 to axle 1 be screwed into direction outstanding in turn over the bulge 13a of shape, this bulge 13a is by hanging tight with the flank (follow-up side flank) of worm tooth, stop screw to detach, but in the present embodiment, only hang tightly at single start thread portion 7 places by setting bulge 13a, thereby the bulge 13a and first worm tooth 4 can be hung tightly securely with first worm tooth 4.
In addition, in the present embodiment, it is bigger than two screw section 6 that the maximum outside diameter of worm tooth and Gu Jingdou are single start thread portions 7, therefore, even at single start thread portion 7 places, the paddy portion and first worm tooth 4 present and squeeze the tendency of opening framework 13, thereby, under the state of engaging-in end, the bulge 13a of single start thread portion 7 and framework 13 hangs tightly securely.Thereby screw can be guaranteed high fastening strength.
Also have two overlapping situations about being fastened on the framework 13 of gypsum board, in the case, the length of single start thread portion 7 can be prolonged, no screw section (under fastening state, two pieces of gypsum boards 12 are all tight for well with first worm tooth, 4 extensions) perhaps is set between single start thread portion 7 and 3.
In addition, screw also can be used in gypsum board 12 is fastened on the wooden framework.In the case, mainly be single start thread portion 7 engaging-in wooden frameworks, but axle 1 external diameter (paddy footpath: outer diameter D 3, the D4 of D1, D2 and worm tooth 4,5) all be single start thread portion 7 places greater than 6 places, two screw section, therefore, in the engaging-in securely framework of single start thread portion 7.Thus, can guarantee high fastening strength.In addition, be generally used under the situation of fastening gypsum board, the maximum outside diameter D4 of screw mostly is about 4mm.
The structure of (3) second mode of executions
Fig. 4 represents second mode of execution.It is different with first mode of execution that this second mode of execution only forms self tapping portion the portion of piercing 3 ' this point, and all the other structures equate with first mode of execution.The constituting component that equates with first mode of execution marks same reference character, if do not need to omit explanation especially.
Bit head 3 ' possess two pod 3a and two cutting blade 3b is forming chisel edge (in ゼ Le エ Star ヅ) foremost.Bit head 3 ' external diameter (say exactly for bit head 3 ' maximum circumscribed diameter) three kinds of situations are arranged, equate with the outer diameter D 1 of minor diameter part 8, more bigger and more smaller than D1 than D1, can select any one.
The screw of present embodiment is a made with carbon steel or stainless wire rod (bar).Rolling finishing worm tooth 4,5 utilizes a pair of mould to forge processing bit head 3.Bit head 3 also can be by Milling Process (cutting).As required, can implement heat treatment (Q-tempering) or surface treatment.
Fig. 5 represents the use-case that makes of the described screw of second mode of execution.In this example, screw is used for the section that gypsum board 11 is fastened on sheet copper system slightly is the framework 12 of C word shape, (A) for expression screws in the sectional drawing that is screwed into end, (B) is screwed into sectional drawing in the way for expression.
In being screwed into of screw, at first by bit head 3 ' at gypsum board 11 and framework 12 auger shell line bottom outlets, two screw sections 6 and single start thread portion 7 enter this thread Pilot hole.The paddy footpath D2 of single start thread portion 7 is greater than the paddy footpath D1 of two screw sections 6, therefore, on framework 13, be formed on screw threads and be screwed on the direction bulge 13a that turns over shape in slowly outstanding by entering of screw, the flank of this bulge 13a and first worm tooth 4 (follow-up side flank) is hung tight, thereby prevents that screw from deviating from.
Though also can rise from bit head 3 by worm tooth 4,5, but when the thickness of framework 13 reaches under the situation of a certain degree above (for example more than the 1.2mm), because the high speed rotating screw is the screw cutting bottom outlet on framework 13, so have the anxiety that causes the tissue of gypsum board 13 (should be 12) to crumble in the rotation that is screwed into the initial stage screw.Therefore in the present embodiment, bit head 3 ' length L be set at the thickness T of gypsum board 12 and equate, even structure thus is the screw high speed rotating, worm tooth 4,5 also contacts gypsum board 12 fully or hardly, therefore can prevent that the excessive tissue of gypsum board from crumbling.Thereby present embodiment is suitable for the situation as the thick base material of framework 13.
And the surface side part of gypsum board 12 is destroyed for well, so that screw head 2 is absorbed in the gypsum board 12 easily, thereby in the process of being screwed into, the top portion that preferably sets worm tooth 4,5 destroys the surface side part of gypsum board 12 easily.
This external being used for carries out under the fastening situation to sheet metal system framework 13, usually, the pitch of worm tooth 4,5 little for well.Thereby, the pitch (perhaps lead angle) of worm tooth 4,5 can be set at, connect airtight or close in the shirt rim part of the adjacent worm tooth 4,5 in 6 places, two screw section, expose smooth paddy between the shirt rim part of the worm tooth 4 that single start thread portion 7 places are adjacent.
(4) the 3rd mode of executions
The 3rd mode of execution that Fig. 6 represents is the variation of second mode of execution.In this mode of execution, first worm tooth 4 and second worm tooth 5 be respectively from bit head 3 ' rise, in other words, the top of two worm tooths 4,5 be positioned at bit head 3 '.Other formation equates with second mode of execution.
(5) the 4th mode of executions
Expression the 4th mode of execution of Fig. 7 signal.This 4th mode of execution is the variation of first mode of execution.That is, in this mode of execution, first worm tooth 4 is equal outer diameter D8 in two screw sections 6 and single start thread portion 7 places.Thereby, first worm tooth 4 at the tooth height of large-diameter portion 7 ' locate in the tooth height at minor diameter part 8 places.The external diameter of outer diameter D 5 to the first worm tooths 4 of second worm tooth 5 is little.
(6) the five～six mode of executions
Fig. 8 (A) represents the 5th mode of execution, and 8 (B) represent the 6th mode of execution.The 5th mode of execution and the 6th mode of execution all are made as first worm tooth 4 at 6 places, two screw section and equate with the tooth height of second worm tooth 5.Thereby two worm tooths 4,5 at 6 places, two screw section form equal outer diameters D9.The self tapping portion of the 5th mode of execution is a pointed nose 3, and the self tapping portion of the 6th mode of execution be bit head 3 '.
(7) other
The present invention is in the specific implementation that other are also arranged except that above-mentioned mode of execution.For example, the embedding part of tightening part that is used to embed that forms at head is not only limited to the cross cave, can adopt as variety of ways such as cubic cave or six side caves.The bottom surface of head also can form the cutting blade of cutting workpiece.Adopting under the situation of bit head as self tapping portion, bit head also can adopt variety of way.For example, adopt the shape of rectangular pyramid.Though screw of the present invention is suitable for the fastening of gypsum board most, also can be used for the fastening of thermoinsulation material.
Claims (3)
1. fastening self-tapping type bolt of using of crisp material workpiece, its workpiece that is used for being made of crisp material is fastened to base material, and have the transverse section and be circular axle and the head that is provided with continuously with this cardinal extremity,
The front end with a described opposite side of described axle forms the self tapping portion that enters parts in the mode that does not have bottom outlet, the pointed nose that this self tapping portion be a pointization foremost or for being with the bit head of cutting blade, and the worm tooth of the engaging-in parts of formation on described,
Described head has ladder taper shape portion, and the external diameter of this ladder taper shape portion becomes big from the part that links to each other with described axle to end face, and on the end face of described head, form and tighten the embedding part that part embeds,
It is characterized in that:
Described axle have with the continuous minor diameter part of described self tapping portion and with described continuous large-diameter portion, described minor diameter part and large-diameter portion form continuously via diameter reducing part,
On described minor diameter part, form two worm tooths, i.e. first worm tooth and second worm tooth, in these two worm tooths only first worm tooth extend near the described head, make the minor diameter part of described axle become two screw sections, large-diameter portion forms single start thread portion,
The outside dimension of described single start thread portion is greater than the maximum outside diameter size of two screw sections, and the external diameter of second worm tooth that forms on described minor diameter part is littler than the external diameter of first worm tooth that forms on large-diameter portion,
The profile of bottom surface in the vertical profile front view that is cut off by the plane that comprises the axle center that constitutes described ladder taper shape portion has the crooked visible outline of depression outwardly, thereby described capitiform becomes and the front end similar shapes of loudspeaker,
Described head has the outwardly directed flat lip part of periphery by described ladder taper shape portion, the maximum outside diameter of described ladder taper shape portion is set to about 2 times of maximum outside diameter of first worm tooth, the external diameter of described lip part is 2.5～3.5 times of maximum outside diameter of first worm tooth
Have in vain at interval between the root of adjacent worm tooth on the described axle.
2. the fastening self-tapping type bolt of using of crisp material workpiece as claimed in claim 1, it is characterized in that, at the external diameter of minor diameter part place first worm tooth of the described axle external diameter greater than second worm tooth, and the external diameter of first worm tooth of large-diameter portion is greater than the external diameter of first worm tooth of minor diameter part.
3. the fastening self-tapping type bolt of using of crisp material workpiece as claimed in claim 1, it is characterized in that, equate at the external diameter of described minor diameter part place first worm tooth and the external diameter of second worm tooth, and the external diameter of first worm tooth of large-diameter portion is greater than the external diameter of two worm tooths of minor diameter part.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006110509A JP2007285336A (en) | 2006-04-13 | 2006-04-13 | Self-drilling tapping screw |
| JP2006110509 | 2006-04-13 | ||
| JP2006-110509 | 2006-04-13 | ||
| JP2006120773 | 2006-04-25 | ||
| JP2006-120773 | 2006-04-25 | ||
| JP2006120773A JP2007292201A (en) | 2006-04-25 | 2006-04-25 | Drill screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101054991A CN101054991A (en) | 2007-10-17 |
| CN101054991B true CN101054991B (en) | 2011-03-23 |
Family
ID=38757322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100961545A Expired - Fee Related CN101054991B (en) | 2006-04-13 | 2007-04-13 | Self-tapping type bolt for fastening brittle workpiece |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2007285336A (en) |
| CN (1) | CN101054991B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009115166A (en) * | 2007-11-05 | 2009-05-28 | Nabeya Iron & Tool Works Ltd | Fastener |
| CN102192227A (en) * | 2010-03-04 | 2011-09-21 | 世铠精密股份有限公司 | Fasten bolt |
| JP5823752B2 (en) * | 2011-07-14 | 2015-11-25 | 株式会社パイオラックスメディカルデバイス | Bone fixation screws |
| CN102434560A (en) * | 2011-12-16 | 2012-05-02 | 吴江市黎里科龙铁艺装饰材料厂 | Multi-section screw |
| CN102493993A (en) * | 2011-12-19 | 2012-06-13 | 吴江宏瑞精密机械厂 | Screw |
| CN107420403B (en) * | 2016-05-23 | 2019-08-27 | 徐国泰 | Screw |
| DE102018114983A1 (en) * | 2018-06-21 | 2019-12-24 | Ejot Gmbh & Co. Kg | Self-tapping screw |
| KR102454257B1 (en) * | 2021-08-17 | 2022-10-14 | 한기만 | Structure for connecting the sewer pipes |
| KR102447124B1 (en) * | 2022-03-14 | 2022-09-23 | 한기만 | The connection structure of pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3703843A (en) * | 1971-01-04 | 1972-11-28 | Msl Ind Inc | Fastener with improved thread construction |
| US3861269A (en) * | 1971-01-04 | 1975-01-21 | Superior Dry Wall Screw Mfg Co | Fastener with improved thread construction |
| CN1077005A (en) * | 1992-03-02 | 1993-10-06 | 伊利诺斯工具公司 | Improved concrete fastener |
| US5863167A (en) * | 1995-08-22 | 1999-01-26 | Max Co.,Ltd | Drilling screw for fixing gypsum board to thin steel plate |
| CN2363111Y (en) * | 1998-06-24 | 2000-02-09 | 金伍兴实业股份有限公司 | Self-tapping screw for corrugated plate |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0621269Y2 (en) * | 1989-07-25 | 1994-06-01 | 富士通株式会社 | Ceramic circuit board |
| JP2958750B2 (en) * | 1996-04-05 | 1999-10-06 | フジテック株式会社 | Self-threading screw for soft cutting material and method of manufacturing the same |
| JP3413828B2 (en) * | 1997-03-06 | 2003-06-09 | マックス株式会社 | Driving screw |
| JPH10159821A (en) * | 1996-11-29 | 1998-06-16 | Max Co Ltd | Drilling screw |
| JP3334563B2 (en) * | 1997-06-19 | 2002-10-15 | マックス株式会社 | Driving screw for driving type screw tightening machine |
| JP2001107932A (en) * | 1999-10-13 | 2001-04-17 | Fukasawa:Kk | Screw |
| JP4296674B2 (en) * | 2000-01-13 | 2009-07-15 | 若井産業株式会社 | Self-drilling screw |
-
2006
- 2006-04-13 JP JP2006110509A patent/JP2007285336A/en active Pending
-
2007
- 2007-04-13 CN CN2007100961545A patent/CN101054991B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3703843A (en) * | 1971-01-04 | 1972-11-28 | Msl Ind Inc | Fastener with improved thread construction |
| US3861269A (en) * | 1971-01-04 | 1975-01-21 | Superior Dry Wall Screw Mfg Co | Fastener with improved thread construction |
| CN1077005A (en) * | 1992-03-02 | 1993-10-06 | 伊利诺斯工具公司 | Improved concrete fastener |
| US5863167A (en) * | 1995-08-22 | 1999-01-26 | Max Co.,Ltd | Drilling screw for fixing gypsum board to thin steel plate |
| CN2363111Y (en) * | 1998-06-24 | 2000-02-09 | 金伍兴实业股份有限公司 | Self-tapping screw for corrugated plate |
Non-Patent Citations (1)
| Title |
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| JP特开2001-200822A 2001.07.27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007285336A (en) | 2007-11-01 |
| CN101054991A (en) | 2007-10-17 |
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Granted publication date: 20110323 Termination date: 20190413 |