GB2516628A - Fastening element - Google Patents

Fastening element Download PDF

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Publication number
GB2516628A
GB2516628A GB1313333.5A GB201313333A GB2516628A GB 2516628 A GB2516628 A GB 2516628A GB 201313333 A GB201313333 A GB 201313333A GB 2516628 A GB2516628 A GB 2516628A
Authority
GB
United Kingdom
Prior art keywords
shank
thread
fastening element
head
auxiliary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1313333.5A
Other versions
GB201313333D0 (en
Inventor
Hui-Ju Yang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
T I Midwood & Co Ltd
Original Assignee
T I Midwood & Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by T I Midwood & Co Ltd filed Critical T I Midwood & Co Ltd
Priority to GB1313333.5A priority Critical patent/GB2516628A/en
Publication of GB201313333D0 publication Critical patent/GB201313333D0/en
Publication of GB2516628A publication Critical patent/GB2516628A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0026—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a hard non-organic material, e.g. stone, concrete or drywall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0031—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the screw being designed to be screwed into different materials, e.g. a layered structure or through metallic and wooden parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0057—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections
    • F16B25/0063—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw the screw having distinct axial zones, e.g. multiple axial thread sections with different pitch or thread cross-sections with a non-threaded portion on the shaft of the screw
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
    • F16B25/0042—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw
    • F16B25/0068—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw with multiple-threads, e.g. a double thread screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
    • F16B25/103—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a drilling screw-point, i.e. with a cutting and material removing action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/02—Shape of thread; Special thread-forms

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Bolts, Nuts, And Washers (AREA)

Abstract

A fastening element (10,20,30,40,50,60) has a shank (11,21,31,41,51,61) formed on a bottom end thereof and a head (12,22,32,42,52,62) formed on a top end thereof. The shank (11,21,31,41,51,61) has a thread (111,211,411,511) helically formed around the shank (11,21,31,41,51,61), and at least one auxiliary thread (112,212,412,512) helically formed between each two adjacent tooth segments of the shank (11,21,31,41,51,61), and a drilling portion (114,214,415,515) connected with the thread (111,211,411,511). A pitch diameter of the thread (111,211,411,511) is greater than that of the multiple auxiliary threads (112, 212, 412, 512). An arc shaped surface (113,213,414,514) formed between each tooth segment of the thread (111,211,411,511) and one of each two adjacent tooth segments of the auxiliary thread (112,212,412,512) is recessed inwardly. Accordingly, a contact area between the shank and the hard pavement increases, an object to be fastened can be securely locked, and chips cut by the fastening element can be easily removed. There can also be an additional thread between the head and the shank providing a nut fixing. The multiple auxiliary threads when compared to each other can be of varying pitch depth.

Description

FASTENING ELEMENT
1. Field of the Invention
The present invention relates to a fastening element and, more particularly, to a fastening element appropriate for the mounting on a hard pavement, such as a concrete structure or the like.
2. Description of the Related Art
Bolts, screws, and studs are all fastening elements commonly available. These fastening elements are usually used to assemble parts together or to fasten an object on a particular location through the engagement of threads of the fastening elements, thereby preventing the object from being detached. For applicability of the fastening elements on different occasions, vendors of fastening elements normally select suitable materials for fastening elements depending on the materials of the places on which the fastening elements are fastened, and specifically design shanks of the fastening elements so that people can choose the right fastening elements to position or assemble objects.
Conventional fastening elements specifically mounted on places made of wood or metals or on hard pavement formed by concrete are available in the market. With reference to Fig. 10, a conventional fastening element 80 designed to be mounted on places of concrete structure takes the form of a bolt, and has a shank 81 and a head 82. The head 82 is formed on a top end of the shank 81, is polygonal, and is fitted in a socket of a wrench for the wrench to rotate the conventional fastening element 80. The shank 81 has a thread 811 and a drilling portion 812. The thread 811 is formed around a circumferential surface of the shank 81. The drilling portion 812 is conical and is formed on a bottom end of the shank 81.
If the conventional fastening element 80 is securely mounted in a hard pavement, with reference to Fig. 11, the fastening element 80 is first inserted through a pre-formed hole 91 on an object 90 to be fastened and the drilling portion 812 of the shank 81 is placed in a slot 921 pre-formed in a hard pavement 92. A tool is used to drive the fastening element 80 to rotate so that the shank 81 of the fastening element 80 is gradually sunk into the hard pavement 92 by the drilling of the thread 811 and the object 90 is fastened on the hard pavement 92.
The foregoing conventional fastening element for mounting objects on a hard pavement has special material and surface treatment dedicated to the mounting on a hard pavement.
Moreover, the contact area between the shank 81 and the hard pavement 92 is equal to an area of the circumferential surface of the shank 81, which provides an insufficient locking force. Additionally, the shank 81 takes the form of a vertical rod except the portions of the thread 811. Accordingly, cutting waste from the hard pavement is difficult to be removed upon a fastening operation, and such drawback definitely affects the fastening operation.
An objective of the present invention is to provide a fastening element enhancing a locking force on an object to be fastened, increasing a contact area between the shank of the fastening element and a hard pavement, and easily removing chips cut from the hard pavement by the fastening element.
To achieve the foregoing objective, the fastening element has a top end, a bottom end, a shank, and a head.
The shank is formed on the bottom end of the fastening element, is rod-shaped, and has a bottom end, a circumferential surface, a thread, and at least one auxiliary thread.
The thread is helically formed around the circumferential surface of the shank and has multiple tooth segments.
The at least one auxiliary thread is helically formed around the circumferential surface of the shank and between each two adjacent tooth segments of the thread. Each auxiliary thread has multiple tooth segments. A pitch diameter of the thread is greater than that of each of the at least one auxiliary thread. An arc-shaped surface formed between each tooth segment of the thread and one of each two adjacent tooth segments of the at least one auxiliary thread is recessed inwardly.
The drilling portion is conical, and is formed on the bottom end of the shank.
The head is formed on the top end of the fastening element.
Preferably, the fastening element has one auxiliary thread helically formed around the circumferential surface of the shank and between each two adjacent tooth segments of the thread.
Preferably, an arc-shaped surface formed between each two adjacent tooth segments of the at least one auxiliary thread is recessed inwardly.
Preferably, each of the at least one auxiliary thread has an identical pitch diameter.
Preferably, each of the at least one auxiliary thread has a different pitch diameter.
Preferably, the shank and the head are integrally formed.
Preferably, the fastening element has a threaded portion connected between the shank and the head and integrally formed with the shank and the head.
Preferably, the fastening element has a washer connected between the shank and the head and integrally formed with the shank and the head.
Preferably, the washer has an embossed pattern formed on a bottom of the washer.
The pitch diameter of the auxiliary thread is smaller than that of the thread, and the arc-shaped surface formed between the thread and the auxiliary thread is recessed inwardly such that the contact area between the shank of the fastening element and a hard pavement increases. Accordingly, the fastening element can be mounted with less resistance force, and chips cut by the thread and the auxiliary thread of the fastening element can be easily removed through the arc-shaped surface.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
IN THE DRAWINGS
Fig. 1 is a perspective view of a first embodiment of a fastening element in accordance with the present invention; Fig. 2 is a side view of the fastening element in Fig. 1; Fig. 3 is an operational side view in partial section of the fastening element in Fig. 1; Fig. 4 is a perspective view of a second embodiment of a fastening element in accordance with the present invention; Fig. 5 is an operational side view in partial section of the fastening element in Fig. 4; Fig. 6 is a side view of a third embodiment of a fastening element in accordance with the present invention; Fig. 7 is a side view of a fourth embodiment of a fastening element in accordance with the present invention; Fig. 8 is a side view of a fifth embodiment of a fastening element in accordance with the present invention; Fig. 9 is a side view of a sixth embodiment of a fastening element in accordance with the present invention; Fig. 10 is a side view of a conventional fastening element; and Fig. 11 is an operational side view in partial section of the conventional fastening element in Fig. 10.
A fastening element in accordance with the present invention has a shank and a head.
The shank is formed on a bottom end of the fastening element, and the head is formed on a top end of the fastening element. There are several embodiments of the fastening element.
Fig. I illustrates a first bolt-shaped embodiment. Fig. 4 illustrates a first stud-shaped embodiment. Fig. 6 illustrates the first bolt-shaped embodiment with a washer. Fig. 7 illustrates a second bolt-shaped embodiment. Fig. 8 illustrates a second stud-shaped embodiment. Fig. 9 illustrates the second bolt-shaped embodiment with a washer. Besides the foregoing six embodiments, other fastening elements employing features of the present invention all fall within the protection range of the present invention.
With reference to Figs. 1 and 2, a first embodiment of a fastening element 10 in accordance with the present invention has a shank 11 and a head 12.
The shank 11 is rod-shaped, and has a thread 111, an auxiliary thread 112, and a drilling portion 114. The thread 111 is helically formed around a circumferential surface of the shank 11 from a top end to a bottom end of the shank 11 and has multiple tooth segments.
The auxiliary thread 112 is helically formed around the circumferential surface of the shank 11 and between each two adjacent tooth segments of the thread 111 from the top end to the bottom end of the shank 11, and has multiple tooth segments. A pitch diameter of the thread 111 is greater than that of the auxiliary thread 112. An arc-shaped surface 113 formed between each tooth segment of the thread 111 and one of each two adjacent tooth segments of the auxiliary thread 112 is centrally and inwardly recessed. In other words, the tooth segment of the thread 111 and the tooth segment of the auxiliary thread 112 adjacent to each arc-shaped surface extend outwardly. The drilling portion 114 is conical, is formed on the bottom end of the shank 11, and is connected with the thread 111.
The head 12 is formed on a top end of the fastening element 10, is connected with the shank 11, is integrally formed with the shank 11, and is polygonal. The head may take a hexagonal form or other polygonal form according to a type of a socket of a tool for tightening the fastening element 10.
With reference to Fig. 3, if the fastening element 10 is used to fasten an object 13 on a hard pavement 14, such as a concrete structure, a through hole 131 is formed through the object 13, and a positioning slot 141 is formed in the hard pavement 14 beforehand. Then, the shank 11 of the fastening element 10 is inserted through the through hole 131 of the object 13, and the drilling portion 114 is placed in the positioning slot 141 of the hard pavement 14. A socket of a tool is fitted over the head 12 of the fastening element 10 to drive the fastening element 10 to drill in the hard pavement 14. When contacting the hard pavement 14, the thread 111 starts rotatably cutting the hard pavement 14 for the fastening element 10 to be gradually sunk into the hard pavement 14. Chips can be removed upwardly through the arc-shaped surfaces 113 of the shank 11.
As the fastening element 10 has the auxiliary thread 112 with the pitch diameter smaller than that of the thread 111, the auxiliary thread 112 has less friction force than the thread 111 when contacting the hard pavement 14. Hence, when the fastening element 10 is mounted, the resistance force does not increase. However, when the fastening element 10 is used to fasten the object 13, each tooth segment of the thread 111 and the auxiliary thread 112 engages an inner portion of the hard pavement 14, and a contact area between the shank 11 and the hard pavement 14 increases due to the arc-shaped surface 113, thereby increasing a locking force of the fastening element 10 in the hard pavement 14.
With reference to Fig. 4, a second embodiment of a fastening element 20 in accordance with the present invention is shown. The fastening element 20 has a shank 21, a threaded portion 23, and a head 22. The shank 21 has a thread 211 and an auxiliary thread 212 both helically formed around a circumferential surface of the shank 21. A pitch diameter of the thread 211 is greater that of the auxiliary thread 212. An arc-shaped surface 213 formed between each tooth segment of the thread 211 and one of each two adjacent tooth segments of the auxiliary thread 212 is centrally and inwardly recessed. The drilling portion 214 is conical, is formed on a bottom end of the shank 21, and is connected with the thread 211. The head 22 is polygonal, is formed on a top end of the fastening element 20, and is connected with the shank 21 through the threaded portion 23.
With reference to Fig. 5, after the shank 21 of the fastening element 20 penetrates through a through hole 241 of an object 24 and is locked into a hard pavement 25, a nut 26 is mounted around and engages the threaded portion 23 through the head 22 so as to be tightly pressed on the object 24. Given a similar design of the shank 21, the present embodiment can achieve the same locking effect in the hard pavement 25 as the first embodiment.
With reference to Fig. 6, a third embodiment of a fastening element 30 in accordance with the present invention has a shank 31 being structurally identical to those in the foregoing embodiments. The shank 31 further has a head 32 and a washer 33. The head 32 is polygonal and is formed on a top end of the fastening element 30. The washer 33 is connected between the head 32 and the shank 31 and is integrally formed with the head 32 and the shank 31, and an outer diameter of the washer is greater than a diameter of a circumscribed circle of the head 32. Hence, when the fastening element 30 is used to fix an object, the washer 33 tightly abuts against the object to increase a locking force of the fastening element 30. The washer 33 can also have an embossed pattern formed on a bottom of the washer 33 for the enhancement of engaging and locking force.
With reference to Figs. 7 to 9, a fourth embodiment, a fifth embodiment, and a sixth embodiment of a fastening element 40,50,60 in accordance with the present invention involve changes in the structure of the shank 41,51,61. As to the fourth embodiment in Fig. 7, the fastening element 40 has a shank 41, and a head 42.
The shank 41 has a thread 411, multiple auxiliary threads 412,413, and a drilling portion 415. The thread 411 is helically formed around a circumferential surface of the shank 41 from a top end to a bottom end of the shank 41 and has multiple tooth segments. Each auxiliary thread 412,413 is formed around the circumferential surface of the shank 41 and between each two adjacent tooth segments of the thread 411 from the top end to the bottom end of the shank 41, and has multiple tooth segments. In the present embodiment, the fastening element has two auxiliary threads 412, 413. A pitch diameter of the thread 411 is greater than that of each auxiliary thread 412, 413. The pitch diameter of one of the auxiliary threads 412 may be equal to or greater than that of the other auxiliary thread 413. An arc-shaped surface 414 formed between each tooth segment of the thread 411 and an adjacent tooth segment of one of the auxiliary threads 412, 413, between each two adjacent tooth segments of the auxiliary threads 412, 413, or between each tooth segment of the thread 411 and an adjacent tooth segment of the other auxiliary threads 413, 412, is centrally and inwardly recessed. The drilling portion 415 is conical, and is formed on the bottom end of the shank 41. The head 42 is formed on a top end of the fastening element 40, is connected with the shank 41, is integrally formed with the shank 11, and is polygonal. In the present embodiment, multiple auxiliary threads 412,413 can further increase the locking force of the fastening element 40. In addition, if the pitch diameters of the thread 411 and the auxiliary threads 412, 413 vary in a progressive fashion, progressively increasing thread thrust force can be generated to facilitate a fastening operation.
As to the fifth embodiment in Fig. 8, the fastening element 50 has a shank 51, a head 52, and a threaded portion 53. The shank 51 has an identical structural design as the shank 41 of the fastening element 40 in Fig. 7, and has a thread 511, multiple auxiliary threads 512, 513, and a drilling portion 515. The thread 511 is helically formed around a circumferential surface of the shank 51 from a top end to a bottom end of the shank 51 and has multiple tooth segments. Each auxiliary thread 512, 513 is formed around the circumferential surface of the shank 51 and between each two adjacent tooth segments of the thread 511 from the top end to the bottom end of the shank 51, and has multiple tooth segments. A pitch diameter of the thread 511 is greater than that of each auxiliary thread 512, 513. The pitch diameter of one of the auxiliary threads 512 may be equal to or greater than that of the other auxiliary thread 513.
An arc-shaped surface 514 formed between each tooth segment of the thread 511 and an adjacent tooth segment of one of the auxiliary threads 512, 513, between each two adjacent tooth segments of the auxiliary threads 512, 513, or between each tooth segment of the thread 511 and an adjacent tooth segment of the other auxiliary threads 513, 512 is centrally and inwardly recessed. The drilling portion 515 is conical, and is formed on the bottom end of the shank 51. The head 52 is formed on a top end of the fastening element 50, is connected with the shank 51, is integrally formed with the shank 51, and is polygonal. The threaded portion 53 is connected between the head 52 and the shank 51 and is integrally formed with the head 52 and the shank 51. Given the design of the shank 51, the locking force of the stud-shaped fastening element 50 is increased.
As to the fifth embodiment in Fig. 9, the fastening element 60 has a shank 51 a head 62, and a washer 63. The shank 61 has an identical structural design as the shank 41 of the fastening element 40 in Fig. 7. The head 62 is formed on a top end of the fastening element 60 and is polygonal. The washer 63 is connected between the head 62 and the shank 61 and is integrally formed with the head 62 and the shank 61, and an outer diameter of the washer 63 is greater than a diameter of a circumscribed circle of the head 62. The washer 63 can also have an embossed pattern formed on a bottom of the washer 63.
In sum, the fastening element of the present invention provides one thread and at least one auxiliary thread having a smaller pitch diameter than that of the thread on the shank, and an arc-shaped surface formed between each two adjacent tooth segments of one of the thread and the auxiliary thread or of both the thread and the auxiliary thread to enhance the locking force of the fastening element on an object to be fastened on a hard pavement, such as a concrete structure, to increase a contact area with the hard pavement, and to easily remove chips cut from the hard pavement.

Claims (9)

  1. CLAIMS: 1. A fastening element (10, 20, 30, 40, 50, 60) comprising: a top end; a bottom end; a shank (11,21, 31,41, 51, 61) formed on the bottom end of the fastening element (10, 20, 30, 40, 50, 60), being rod-shaped, and having: a bottom end; a circumferential surface; a thread (111,211,411,511) helicallyformed around the circumferential surface of the shank (11, 21, 31, 41, 51, 61) and having multiple tooth segments; at least one auxiliary thread (112, 212, 412, 512) helically formed around the circumferential surface of the shank (11, 21, 31, 41, 51, 61) and between each two adjacent tooth segments of the thread (111, 211, 411, 511), each auxiliary thread (112, 212, 412, 512) having multiple tooth segments, wherein a pitch diameter of the thread (111, 211, 411, 511) is greater than that of each of the at least one auxiliary thread (112, 212, 412, 512), and an arc-shaped surface (113, 213) formed between each tooth segment of the thread (111, 211, 411, 511) and one of each two adjacent tooth segments of the at least one auxiliary thread (112, 212, 412, 512) is recessed inwardly; and a drilling portion (114, 214, 415, 515) being conical, and formed on the bottom end of theshank(11,21,31,41,51,61);and a head (12, 22, 32, 42, 52, 62) formed on the top end of the fastening element (10, 20, 30, 40, 50, 60).
  2. 2. The fastening element (10, 20, 30, 40, 50, 60) as claimed in claim 1, comprising one auxiliary thread (112, 212) helically formed around the circumferential surface of the shank (11, 21, 31, 41, 51, 61) and between each two adjacent tooth segments of the thread (111, 211,411,511).
  3. 3. The fastening element (10, 20, 30, 40, 50, 60) as claimed in claim 1, wherein an arc-shaped surface (414, 514) formed between each two adjacent tooth segments of the at least one auxiliary thread (412, 512) is recessed inwardly.
  4. 4. The fastening element (10, 20, 30, 40, 50, 60) as claimed in claim 3, wherein the at least one auxiliary thread (112, 212,412, 512) each has an identical pitch diameter.
  5. 5. The fastening element (10, 20, 30, 40, 50, 60) as claimed in claim 3, wherein the shank has multiple auxiliary threads (112, 212, 412, 512), and the auxiliary threads (112, 212, 412, 512) have different pitch diameters.
  6. 6. The fastening element (10, 20, 30, 40, 50, 60) as claimed in any one of claims ito 5, wherein the shank (ii, 21, 31, 41, 51, 61) and the head (12, 22, 32, 42, 52, 62) are integrally formed.
  7. 7. The fastening element (10, 20, 30, 40, 50, 60) as claimed in any one of claims ito 5, further comprising a threaded portion (23, 53) connected between the shank (11, 21, 31, 41, 51, 61) and the head (12, 22, 32, 42, 52, 62) and integrally formed with the shank (11,21,31, 41, 51, 61)and the head (12, 22, 32, 42, 52, 62).
  8. 8. The fastening element (10, 20, 30, 40, 50, 60) as claimed in any one of claims ito 5, further comprising a washer (33, 63) connected between the shank (ii, 21, 31, 41, 51, 61) and the head (12, 22, 32, 42, 52, 62) and integrally formed with the shank (11, 21, 31, 41, 51, 61) and the head (12, 22, 32, 42, 52, 62).
  9. 9. The fastening element (10, 20, 30, 40, 50, 60) as claimed in claim 8, wherein the washer (33, 63) has an embossed pattern formed on a bottom of the washer (33, 63).
GB1313333.5A 2013-07-26 2013-07-26 Fastening element Withdrawn GB2516628A (en)

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GB201313333D0 GB201313333D0 (en) 2013-09-11
GB2516628A true GB2516628A (en) 2015-02-04

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020005458A1 (en) * 2018-06-25 2020-01-02 The Hillman Group, Inc. Screw-type fastener for cement board
WO2022231920A1 (en) * 2021-04-30 2022-11-03 Simpson Strong-Tie Company Inc. Concrete fastener
US11572915B2 (en) 2018-06-25 2023-02-07 The Hillman Group, Inc. Screw-type fastener for cement board

Citations (5)

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US6918727B2 (en) * 2002-05-01 2005-07-19 Joker Industrial Co., Ltd. Anchoring screw with double heads and triple threads of different depths of thread
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WO2020005458A1 (en) * 2018-06-25 2020-01-02 The Hillman Group, Inc. Screw-type fastener for cement board
US11572915B2 (en) 2018-06-25 2023-02-07 The Hillman Group, Inc. Screw-type fastener for cement board
WO2022231920A1 (en) * 2021-04-30 2022-11-03 Simpson Strong-Tie Company Inc. Concrete fastener
US11739783B2 (en) 2021-04-30 2023-08-29 Simpson Strong-Tie Company Inc. Concrete fastener

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