US20180073547A1 - Structure of screw - Google Patents
Structure of screw Download PDFInfo
- Publication number
- US20180073547A1 US20180073547A1 US15/263,377 US201615263377A US2018073547A1 US 20180073547 A1 US20180073547 A1 US 20180073547A1 US 201615263377 A US201615263377 A US 201615263377A US 2018073547 A1 US2018073547 A1 US 2018073547A1
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- US
- United States
- Prior art keywords
- screw
- thread
- prevention mechanism
- shank
- reverse prevention
- 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.)
- Abandoned
Links
- 230000002265 prevention Effects 0.000 claims abstract description 79
- 230000000694 effects Effects 0.000 abstract description 26
- 230000000903 blocking effect Effects 0.000 abstract description 8
- 230000002708 enhancing effect Effects 0.000 description 3
- 230000003405 preventing effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- 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
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/282—Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts
-
- 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
- F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
- F16B41/002—Measures against loss of bolts, nuts or pins
-
- 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
-
- 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
- F16B39/00—Locking of screws, bolts or nuts
-
- 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
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
- F16B39/30—Locking exclusively by special shape of the screw-thread
Definitions
- the present invention relates generally to a structure of a screw, and more particularly to a screw structure that prevents a screw from being readily screwed out and loosening in order to enhance a reverse rotation preventing effect and thus improve the overall performance of the screw.
- a conventional screw 1 as shown in FIG. 1 , comprises a screw cap 11 and a shank 12 extending downward from the screw cap 11 .
- the shank 12 has an outer circumferential surface on which an external thread 13 is formed and helically extends around the shank.
- the shank 12 has a lower end forming a tip 14 .
- the tip 14 is first pressed onto a surface of a workpiece and then, a power tool or a hand tool applies a torque, through the screw cap 11 , to drive the screw 1 to rotate so that the tip 14 is forced to cut and screw into the workpiece.
- a power tool or a hand tool applies a torque, through the screw cap 11 , to drive the screw 1 to rotate so that the tip 14 is forced to cut and screw into the workpiece.
- the conventional screw 1 which is so screwed into the workpiece, can also be screwed out with a power tool or a hand tool applying a torque to the screw cap 11 and thus rotating the screw 1 .
- the screw 1 cannot be readily screwed out of the workpiece.
- the primary object of the present invention is to provide a solution that effectively overcomes the drawback that a conventional screw, due to lacking a reverse rotation mechanism, is readily screwed out.
- the technical solution that the present invention adopts to achieve the above object is a structure of a screw, wherein the screw comprises a screw cap and a shank extending downward from the screw cap.
- the shank has an outer circumferential surface on which a thread is formed.
- the shank has a lower end forming a tip section.
- the screw cap is extended downward to form a conic section.
- the conic section is provided with a reverse prevention mechanism, which is constructed to comprise at least one step structure.
- a reverse prevention mechanism is provided on a conic section of a screw cap of the screw and the reverse prevention mechanism is constructed to comprise at least one step structure.
- the reverse prevention mechanism provides a blocking and resisting effect to prevent the screw from being readily screwed out of the workpiece and thus, the reverse prevention effect of the screw can be enhanced and the overall effectiveness of use of the screw is improved.
- FIG. 1 is a perspective view showing a conventional screw.
- FIG. 2 is a perspective view showing a screw according to the present invention.
- FIG. 3 shows an alternative embodiment of the screw of the present invention shown in FIG. 2 .
- FIG. 4 shows an embodiment in which a reverse prevention mechanism is provided on a neck of a screw body.
- FIG. 5 shows another embodiment in which a reverse prevention mechanism is provided on a neck of a screw body.
- FIGS. 6 and 6A show a further embodiment in which a reverse prevention mechanism is provided on a neck of a screw shank.
- FIGS. 7 and 7A show an embodiment in which a reverse prevention mechanism is provided on a screw tip.
- FIGS. 8, 8A, and 8B show another embodiment of a thread of a screw according to the present invention.
- FIG. 9 shows a reverse prevention mechanism provided on a screw thread.
- the present invention provides a screw 2 that comprises a screw cap 21 and a shank 22 extending downward from the screw cap 21 .
- the shank 22 can be a cylindrical body having a configuration of a cylinder or a triangular prism or, alternatively, the shank 22 comprises a body comprising a combination of a cylindrical section and a triangular prismatic section.
- the shank 22 has an outer circumferential surface around which a thread 23 is circumferentially formed.
- the shank 22 has a lower end forming a tip section 24 .
- the thread 23 extends to the tip section 24 .
- the screw cap 21 of the screw 2 has a top end that has a portion that is recessed to form a rotating section 211 .
- the screw cap 21 is extended in a direction toward the shank 22 to form a conic section 212 .
- the conic section 212 is provided thereon with a reverse rotation prevention mechanism 3 , which will be referred to as a reverse prevention mechanism for simplification.
- the reverse prevention mechanism 3 comprises at least one step structure arranged in the direction of the thread 23 .
- the conic section 212 is also screwed, at least partly or entirely, into the workpiece.
- the reverse prevention mechanism 3 provides a blocking and resisting effect to prevent the screw 2 from being readily screwed out of the workpiece and thus, the screw 2 shows an enhanced reverse prevention effect.
- the reverse prevention mechanism 3 that is provided on the conic section 212 of the screw 2 can be extended to the top surface of the screw cap 21 in order to further enhance the reverse prevention effect of the screw 2 .
- the shank 22 on the underside of the screw cap 21 of the screw 2 of the present invention may be structured to comprise a thread-free neck section 221 , and the thread 23 may be arranged to extend from a lower side of the neck section 221 to the tip section 24 .
- the neck section 221 is provided with a reverse prevention mechanism 3 , and more specifically, the reverse prevention mechanism 3 is arranged between a lower end of the conic section 212 of the screw cap 21 and an upper end of the thread 23 .
- the reverse prevention mechanism 3 is constructed to comprise at least one step structure that is arranged in a longitudinal direction of the shank 22 .
- the neck section 221 is also screwed, at least partly, into the workpiece.
- the reverse prevention mechanism 3 provides a blocking and resisting effect to prevent the screw 2 from being readily screwed out of the workpiece and thus, the screw 2 shows an enhanced reverse prevention effect.
- a reverse prevention mechanism 3 that is arranged between a lower end of the conic section 212 of the screw cap 21 and an upper end of the thread 23 is constructed to comprise at least one step structure that is inclined with respect to a longitudinal direction of the shank 22 so as to enhance a reverse prevention effect of the screw 2 .
- a reverse prevention mechanism 3 that is arranged between a lower end of the conic section 212 of the screw cap 21 and an upper end of the thread 23 is constructed to extend upward from the upper end of the thread 23 , but does not extend to the conic section 212 of the screw cap 21 . More specifically, a portion of the neck section 221 that is between an upper end of the reverse prevention mechanism 3 and a lower end of the conic section 212 of the screw cap 21 is provided with no thread 23 , and the reverse prevention mechanism 3 is constructed to comprise at least one step structure arranged in the direction of the thread 23 so as to enhance the reverse prevention effect of the screw 2 .
- the neck section 221 of the shank 22 that is between the lower end of the conic section 2121 of the screw cap 21 and the reverse prevention mechanism 3 is provided with a neck thread 231 .
- the neck thread 231 has an outside diameter that is equal to or slightly greater than an outside diameter of the reverse prevention mechanism 3 and as such, the neck thread 231 can also be screwable into the workpiece to provide a screwing and fixing effect and thus enhancing the reverse prevention effect of the screw 2 .
- the screw 2 of the present invention is provided with a reverse prevention mechanism 3 formed at the tip section 24 .
- a neck section 221 located under the conic section 212 of the screw cap 21 is provided with no thread 23 .
- the reverse prevention mechanism 3 is constructed to comprise at least one step structure arranged in the direction of the thread 23 so that when the screw 2 is screwed into a workpiece, the tip section 24 is also screwed into the workpiece and in an attempt to screw the screw 2 out of the workpiece, the reverse prevention mechanism 3 provides a blocking and resisting effect to prevent the screw 2 from being readily screwed out of the workpiece and thus, the reverse prevention effect of the screw 2 can be enhanced.
- the neck section 221 that is located at the lower end of the conic section 212 of the screw cap 21 is provided with a neck thread 231 .
- the thread 23 of the shank 22 is arranged, as a whole, to extend from the screw cap 21 to the tip section 24 , so that the neck section 221 at the lower end of the conic section 212 of the screw cap 21 is also screwable into a workpiece to provide a screwing and fixing effect and thus enhancing the reverse prevention effect of the screw 2 .
- the neck section 221 at the lower end of the conic section 212 of the screw cap 21 of the screw 2 of the present invention is provided with no thread 23 .
- the screw 2 is provided with a reverse prevention mechanism 3 arranged on the thread 23 .
- the thread 23 is an umbrella-shaped thread 23 a
- the reverse prevention mechanism 3 is constructed to comprise at least one step structure arranged in the direction of the umbrella-shaped thread 23 a .
- the neck section 221 located at the lower end of the conic section 212 of the screw cap 21 of the screw 2 is provided with no thread 23 .
- the screw 2 comprises a thread 23 that has a regular tooth- or ridge-like thread extending from the thread 23 a that is provided with the reverse prevention mechanism 3 to the tip section 24 .
- the thread 23 that has a regular-shaped thread is arranged to extend from a lower end of the umbrella-shaped thread 23 a toward the tip section 24 .
- the thread 23 has an outside diameter equal to or slightly greater than an outside diameter of the reverse prevention mechanism 3 so as to enhance the reverse prevention effect of the screw 2 .
- the neck section 221 at the lower end of the conic section 212 of the screw cap 21 is provided with a neck thread 231 .
- the thread 23 of the shank 22 extends from the screw cap 21 to the tip section 24 , and the screw 2 comprises sections that comprise threads 23 having regular-shaped thread formed in the neck section 221 and from the reverse prevention mechanism 3 toward the tip section 24 .
- the portion from the upper end of the umbrella-shaped thread 23 a to the neck section 221 of the screw 2 and the portion from the lower end of the umbrella-shaped thread 23 a to the tip section 24 are threads 23 having regular thread configuration and the threads 23 have an outside diameter that is equal to or slightly greater than an outside diameter of the reverse prevention mechanism 3 .
- the neck section 221 located below the conic section 212 of the screw cap 21 is also screwable into the workpiece to provide a screwing and fixing effect thereby enhancing the reverse prevention effect of the screw 2 .
- a screw 2 of the present invention comprises a thread 23 that extends from a screw cap 21 to a tip section 24 .
- the screw 2 is provided with a reverse prevention mechanism 3 arranged on the thread 23 .
- the reverse prevention mechanism 3 is constructed to comprise at least one step structure arranged in the direction of the thread 23 .
- the efficacy of the present invention is that, in a screw 2 , a reverse prevention mechanism 3 is provided on a conic section 212 of a screw cap 21 or a neck section 221 of a shank 22 or a tip section 24 and the reverse prevention mechanism 3 is constructed to comprise at least one step structure.
- the reverse prevention mechanism 3 provides a blocking and resisting effect to prevent the screw 2 from being readily screwed out of the workpiece and thus, the reverse prevention effect of the screw 2 can be enhanced and the overall effectiveness of use of the screw 2 is improved.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Dowels (AREA)
Abstract
A screw includes a screw cap and a shank extending downward from the screw cap. The shank has an outer circumferential surface on which a thread is formed. The shank has a lower end forming a tip section. The screw cap is extended downward to form a conic section. The conic section is provided thereon with a reverse prevention mechanism, which is constructed to include at least one step structure. After the screw is screwed into a workpiece, in an attempt to screw the screw out of the workpiece, the reverse prevention mechanism providing a blocking and resisting effect to prevent the screw from being readily screwed out of the workpiece and thus, a reverse prevention effect of the screw can be enhanced to thereby improve overall performance of use of the screw.
Description
- The present invention relates generally to a structure of a screw, and more particularly to a screw structure that prevents a screw from being readily screwed out and loosening in order to enhance a reverse rotation preventing effect and thus improve the overall performance of the screw.
- A conventional screw 1, as shown in
FIG. 1 , comprises ascrew cap 11 and ashank 12 extending downward from thescrew cap 11. Theshank 12 has an outer circumferential surface on which anexternal thread 13 is formed and helically extends around the shank. Theshank 12 has a lower end forming atip 14. - To tighten the screw 1, the
tip 14 is first pressed onto a surface of a workpiece and then, a power tool or a hand tool applies a torque, through thescrew cap 11, to drive the screw 1 to rotate so that thetip 14 is forced to cut and screw into the workpiece. However, the conventional screw 1, which is so screwed into the workpiece, can also be screwed out with a power tool or a hand tool applying a torque to thescrew cap 11 and thus rotating the screw 1. There are applications where it is desired the screw 1 cannot be readily screwed out of the workpiece. - Thus, it is a challenge of the screw manufacturers to provide a screw 1 showing a reverse rotation preventing effect in order to prevent the screw 1 from being readily screwed out of a workpiece.
- The primary object of the present invention is to provide a solution that effectively overcomes the drawback that a conventional screw, due to lacking a reverse rotation mechanism, is readily screwed out.
- The technical solution that the present invention adopts to achieve the above object is a structure of a screw, wherein the screw comprises a screw cap and a shank extending downward from the screw cap. The shank has an outer circumferential surface on which a thread is formed. The shank has a lower end forming a tip section. The screw cap is extended downward to form a conic section. The conic section is provided with a reverse prevention mechanism, which is constructed to comprise at least one step structure.
- The efficacy that the above technical solution adopted by the present invention may achieve is that a reverse prevention mechanism is provided on a conic section of a screw cap of the screw and the reverse prevention mechanism is constructed to comprise at least one step structure. As such, with the screw being screwed into a workpiece, in an attempt to screw the screw out of the workpiece, the reverse prevention mechanism provides a blocking and resisting effect to prevent the screw from being readily screwed out of the workpiece and thus, the reverse prevention effect of the screw can be enhanced and the overall effectiveness of use of the screw is improved.
- The foregoing objectives and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.
- Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
-
FIG. 1 is a perspective view showing a conventional screw. -
FIG. 2 is a perspective view showing a screw according to the present invention. -
FIG. 3 shows an alternative embodiment of the screw of the present invention shown inFIG. 2 . -
FIG. 4 shows an embodiment in which a reverse prevention mechanism is provided on a neck of a screw body. -
FIG. 5 shows another embodiment in which a reverse prevention mechanism is provided on a neck of a screw body. -
FIGS. 6 and 6A show a further embodiment in which a reverse prevention mechanism is provided on a neck of a screw shank. -
FIGS. 7 and 7A show an embodiment in which a reverse prevention mechanism is provided on a screw tip. -
FIGS. 8, 8A, and 8B show another embodiment of a thread of a screw according to the present invention. -
FIG. 9 shows a reverse prevention mechanism provided on a screw thread. - The following descriptions are exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.
- Firstly, referring to
FIG. 2 , the present invention provides ascrew 2 that comprises ascrew cap 21 and ashank 22 extending downward from thescrew cap 21. Theshank 22 can be a cylindrical body having a configuration of a cylinder or a triangular prism or, alternatively, theshank 22 comprises a body comprising a combination of a cylindrical section and a triangular prismatic section. Theshank 22 has an outer circumferential surface around which athread 23 is circumferentially formed. Theshank 22 has a lower end forming atip section 24. Thethread 23 extends to thetip section 24. - As shown in
FIG. 2 , thescrew cap 21 of thescrew 2 has a top end that has a portion that is recessed to form arotating section 211. Thescrew cap 21 is extended in a direction toward theshank 22 to form aconic section 212. Theconic section 212 is provided thereon with a reverserotation prevention mechanism 3, which will be referred to as a reverse prevention mechanism for simplification. Thereverse prevention mechanism 3 comprises at least one step structure arranged in the direction of thethread 23. As such, when thescrew 2 is screwed into a workpiece (not shown in the drawings), theconic section 212 is also screwed, at least partly or entirely, into the workpiece. Thus, when an attempt is made to screw thescrew 2 out of the workpiece, thereverse prevention mechanism 3 provides a blocking and resisting effect to prevent thescrew 2 from being readily screwed out of the workpiece and thus, thescrew 2 shows an enhanced reverse prevention effect. - As shown in
FIG. 3 , thereverse prevention mechanism 3 that is provided on theconic section 212 of thescrew 2 can be extended to the top surface of thescrew cap 21 in order to further enhance the reverse prevention effect of thescrew 2. - As shown in
FIG. 4 , theshank 22 on the underside of thescrew cap 21 of thescrew 2 of the present invention may be structured to comprise a thread-free neck section 221, and thethread 23 may be arranged to extend from a lower side of theneck section 221 to thetip section 24. Theneck section 221 is provided with areverse prevention mechanism 3, and more specifically, thereverse prevention mechanism 3 is arranged between a lower end of theconic section 212 of thescrew cap 21 and an upper end of thethread 23. Thereverse prevention mechanism 3 is constructed to comprise at least one step structure that is arranged in a longitudinal direction of theshank 22. As such, when thescrew 2 is screwed in to a workpiece, theneck section 221 is also screwed, at least partly, into the workpiece. Thus, when an attempt is made to screw thescrew 2 out of the workpiece, thereverse prevention mechanism 3 provides a blocking and resisting effect to prevent thescrew 2 from being readily screwed out of the workpiece and thus, thescrew 2 shows an enhanced reverse prevention effect. - As shown in
FIG. 5 , areverse prevention mechanism 3 that is arranged between a lower end of theconic section 212 of thescrew cap 21 and an upper end of thethread 23 is constructed to comprise at least one step structure that is inclined with respect to a longitudinal direction of theshank 22 so as to enhance a reverse prevention effect of thescrew 2. - As shown in
FIG. 6 , areverse prevention mechanism 3 that is arranged between a lower end of theconic section 212 of thescrew cap 21 and an upper end of thethread 23 is constructed to extend upward from the upper end of thethread 23, but does not extend to theconic section 212 of thescrew cap 21. More specifically, a portion of theneck section 221 that is between an upper end of thereverse prevention mechanism 3 and a lower end of theconic section 212 of thescrew cap 21 is provided with nothread 23, and thereverse prevention mechanism 3 is constructed to comprise at least one step structure arranged in the direction of thethread 23 so as to enhance the reverse prevention effect of thescrew 2. - As shown in
FIG. 6A , theneck section 221 of theshank 22 that is between the lower end of theconic section 2121 of thescrew cap 21 and thereverse prevention mechanism 3 is provided with aneck thread 231. Theneck thread 231 has an outside diameter that is equal to or slightly greater than an outside diameter of thereverse prevention mechanism 3 and as such, theneck thread 231 can also be screwable into the workpiece to provide a screwing and fixing effect and thus enhancing the reverse prevention effect of thescrew 2. - As shown in
FIG. 7 , thescrew 2 of the present invention is provided with areverse prevention mechanism 3 formed at thetip section 24. Aneck section 221 located under theconic section 212 of thescrew cap 21 is provided with nothread 23. Thereverse prevention mechanism 3 is constructed to comprise at least one step structure arranged in the direction of thethread 23 so that when thescrew 2 is screwed into a workpiece, thetip section 24 is also screwed into the workpiece and in an attempt to screw thescrew 2 out of the workpiece, thereverse prevention mechanism 3 provides a blocking and resisting effect to prevent thescrew 2 from being readily screwed out of the workpiece and thus, the reverse prevention effect of thescrew 2 can be enhanced. - As shown in
FIG. 7A , theneck section 221 that is located at the lower end of theconic section 212 of thescrew cap 21 is provided with aneck thread 231. In other words, thethread 23 of theshank 22 is arranged, as a whole, to extend from thescrew cap 21 to thetip section 24, so that theneck section 221 at the lower end of theconic section 212 of thescrew cap 21 is also screwable into a workpiece to provide a screwing and fixing effect and thus enhancing the reverse prevention effect of thescrew 2. - As shown in
FIG. 8 , theneck section 221 at the lower end of theconic section 212 of thescrew cap 21 of thescrew 2 of the present invention is provided with nothread 23. Thescrew 2 is provided with areverse prevention mechanism 3 arranged on thethread 23. Thethread 23 is an umbrella-shapedthread 23 a, and thereverse prevention mechanism 3 is constructed to comprise at least one step structure arranged in the direction of the umbrella-shapedthread 23 a. As such, with thescrew 2 being screwed into a workpiece, in an attempt to screw thescrew 2 out of the workpiece, thereverse prevention mechanism 3 provides a blocking and resisting effect to prevent thescrew 2 from being readily screwed out of the workpiece and thus, the reverse prevention effect of thescrew 2 can be enhanced. - As shown in
FIG. 8A , theneck section 221 located at the lower end of theconic section 212 of thescrew cap 21 of thescrew 2 is provided with nothread 23. Thescrew 2 comprises athread 23 that has a regular tooth- or ridge-like thread extending from thethread 23 a that is provided with thereverse prevention mechanism 3 to thetip section 24. In other words, thethread 23 that has a regular-shaped thread is arranged to extend from a lower end of the umbrella-shapedthread 23 a toward thetip section 24. Thethread 23 has an outside diameter equal to or slightly greater than an outside diameter of thereverse prevention mechanism 3 so as to enhance the reverse prevention effect of thescrew 2. - As shown in
FIG. 8B , theneck section 221 at the lower end of theconic section 212 of thescrew cap 21 is provided with aneck thread 231. In other words, thethread 23 of theshank 22, as a whole, extends from thescrew cap 21 to thetip section 24, and thescrew 2 comprises sections that comprisethreads 23 having regular-shaped thread formed in theneck section 221 and from thereverse prevention mechanism 3 toward thetip section 24. In other words, the portion from the upper end of the umbrella-shapedthread 23 a to theneck section 221 of thescrew 2 and the portion from the lower end of the umbrella-shapedthread 23 a to thetip section 24 arethreads 23 having regular thread configuration and thethreads 23 have an outside diameter that is equal to or slightly greater than an outside diameter of thereverse prevention mechanism 3. As such, theneck section 221 located below theconic section 212 of thescrew cap 21 is also screwable into the workpiece to provide a screwing and fixing effect thereby enhancing the reverse prevention effect of thescrew 2. - As shown in
FIG. 9 , ascrew 2 of the present invention comprises athread 23 that extends from ascrew cap 21 to atip section 24. Thescrew 2 is provided with areverse prevention mechanism 3 arranged on thethread 23. Thereverse prevention mechanism 3 is constructed to comprise at least one step structure arranged in the direction of thethread 23. As such, with thescrew 2 being screwed into a workpiece, in an attempt to screw thescrew 2 out of the workpiece, thereverse prevention mechanism 3 provides a blocking and resisting effect to prevent thescrew 2 from being readily screwed out of the workpiece and thus, the reverse prevention effect of thescrew 2 can be enhanced. - The efficacy of the present invention is that, in a
screw 2, areverse prevention mechanism 3 is provided on aconic section 212 of ascrew cap 21 or aneck section 221 of ashank 22 or atip section 24 and thereverse prevention mechanism 3 is constructed to comprise at least one step structure. As such, with thescrew 2 being screwed into a workpiece, in an attempt to screw thescrew 2 out of the workpiece, thereverse prevention mechanism 3 provides a blocking and resisting effect to prevent thescrew 2 from being readily screwed out of the workpiece and thus, the reverse prevention effect of thescrew 2 can be enhanced and the overall effectiveness of use of thescrew 2 is improved. - It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.
- While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the claims of the present invention.
Claims (19)
1. A screw, comprising a screw cap and a shank extending downward from the screw cap, the shank having an outside circumferential surface on which a thread is formed, the shank having a lower end forming a tip section, the screw cap being extended downward to form a conic section, the conic section being provided with a reverse prevention mechanism, which is constructed to comprise at least one step structure.
2. A screw, comprising a screw cap and a shank extending downward from the screw cap, the shank having an outside circumferential surface on which a thread is formed, the shank having a lower end forming a tip section, the screw cap being extended downward to form a conic section, the shank located below the screw cap comprising a neck section that is free of thread, the thread-free neck section being provided with a reverse prevention mechanism, which is constructed to comprise at least one step structure.
3. A screw, comprising a screw cap and a shank extending downward from the screw cap, the shank having an outside circumferential surface on which a thread is formed, the shank having a lower end forming a tip section, the screw cap being extended downward to form a conic section, the tip section being provided with a reverse prevention mechanism, which is constructed to comprise at least one step structure.
4. The screw according to claim 1 , wherein the screw cap has a top on which a rotating section is formed.
5. The screw according to claim 2 , wherein the screw cap has a top on which a rotating section is formed.
6. The screw according to claim 3 , wherein the screw cap has a top on which a rotating section is formed.
7. The screw according to claim 1 , wherein the thread is provided with a reverse prevention mechanism, which is constructed to comprise at least one step structure.
8. The screw according to claim 2 , wherein the thread is provided with a reverse prevention mechanism, which is constructed to comprise at least one step structure.
9. The screw according to claim 3 , wherein the thread is provided with a reverse prevention mechanism, which is constructed to comprise at least one step structure.
10. The screw according to claim 1 , wherein the conic section of the screw is provided with a reverse prevention mechanism, which extends to a top surface of the screw cap.
11. The screw according to claim 2 , wherein the reverse prevention mechanism is arranged between a lower end of the conic section of the screw cap and an end of the thread and the reverse prevention mechanism comprises at least one step structure arranged in a longitudinal direction of the shank.
12. The screw according to claim 2 , wherein the reverse prevention mechanism is arranged between a lower end of the conic section of the screw cap and an upper end of the thread and is constructed to comprise at least one step structure that is inclined with respect to a longitudinal direction of the shank.
13. The screw according to claim 2 , wherein the reverse prevention mechanism is arranged between a lower end of the conic section of the screw cap and an upper end of the thread and extends upward from the upper end of the thread and does not extend into the conic section of the screw cap, wherein an upper end of the reverse prevention mechanism and the lower end of the conic section of the screw cap define therebetween a thread-free portion of the neck section.
14. The screw according to claim 1 , wherein the shank comprises a cylindrical or triangular prismatic body or, alternatively, the shank comprises both a cylindrical body and a triangular prismatic body, the thread being an umbrella-shaped thread, on which the reverse prevention mechanism is provided, the reverse prevention mechanism being constructed to comprise at least one step structure.
15. The screw according to claim 2 , wherein the shank comprises a cylindrical or triangular prismatic body or, alternatively, the shank comprises both a cylindrical body and a triangular prismatic body, the thread being an umbrella-shaped thread, on which the reverse prevention mechanism is provided, the reverse prevention mechanism being constructed to comprise at least one step structure.
16. The screw according to claim 3 , wherein the shank comprises a cylindrical or triangular prismatic body or, alternatively, the shank comprises both a cylindrical body and a triangular prismatic body, the thread being an umbrella-shaped thread, on which the reverse prevention mechanism is provided, the reverse prevention mechanism being constructed to comprise at least one step structure.
17. The screw according to claim 2 , wherein the neck portion of the shank located below the screw cap is provided therein with a neck thread, the neck thread having an outside diameter that is equal to or slightly greater than an outside diameter the reverse prevention mechanism.
18. The screw according to claim 14 , wherein the shank below the screw cap is provided with a neck section, which comprises a neck thread, the neck thread having an outside diameter that is equal to or slightly greater than an outside diameter the reverse prevention mechanism.
19. The screw according to claim 14 , wherein the shank below the screw cap is provided with a neck section, which comprises a neck thread, the thread of the shank extending from the screw cap to the tip section, the neck thread and a thread extending from the reverse prevention mechanism to the tip section are both of a regular tooth shape of thread, wherein the neck section of the screw above the umbrella-shaped thread and the thread from the umbrella-shaped thread to the tip section are both of a regular tooth shape of thread, the thread of the regularly shaped screw tooth having an outside diameter equal to or slightly greater than an outside diameter of the reverse prevention mechanism.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/263,377 US20180073547A1 (en) | 2016-09-13 | 2016-09-13 | Structure of screw |
US16/045,773 US20180335074A1 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
US16/045,776 US10724571B2 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
US16/045,775 US10690173B2 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/263,377 US20180073547A1 (en) | 2016-09-13 | 2016-09-13 | Structure of screw |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/045,776 Division US10724571B2 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
US16/045,773 Division US20180335074A1 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
US16/045,775 Division US10690173B2 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
Publications (1)
Publication Number | Publication Date |
---|---|
US20180073547A1 true US20180073547A1 (en) | 2018-03-15 |
Family
ID=61559565
Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/263,377 Abandoned US20180073547A1 (en) | 2016-09-13 | 2016-09-13 | Structure of screw |
US16/045,773 Abandoned US20180335074A1 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
US16/045,776 Active 2036-11-13 US10724571B2 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
US16/045,775 Active 2036-11-13 US10690173B2 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
Family Applications After (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/045,773 Abandoned US20180335074A1 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
US16/045,776 Active 2036-11-13 US10724571B2 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
US16/045,775 Active 2036-11-13 US10690173B2 (en) | 2016-09-13 | 2018-07-26 | Structure of screw |
Country Status (1)
Country | Link |
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US (4) | US20180073547A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180149186A1 (en) * | 2016-11-29 | 2018-05-31 | Philip Bogrash | Bolts, Nuts and Fastener System |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US388000A (en) * | 1888-08-14 | Half to chaeles h | ||
US1088892A (en) * | 1913-05-27 | 1914-03-03 | Ernest Jay Foreman | Screw. |
US1801186A (en) * | 1929-04-18 | 1931-04-14 | Internat Screw Co | Single-point, double-thread drive screw |
US3238836A (en) * | 1964-03-25 | 1966-03-08 | Harry W Johnson | Drilling reaming work extruding self-tapping screw |
US4854311A (en) * | 1986-01-09 | 1989-08-08 | Acro Med Corporation | Bone screw |
JPH03103607A (en) * | 1989-09-13 | 1991-04-30 | Nitto Seiko Co Ltd | Thread forming screw |
US5061135A (en) * | 1990-08-28 | 1991-10-29 | Research Engineering & Manufacturing, Inc. | Thread tapping screw |
DE19532874A1 (en) * | 1995-09-06 | 1997-03-13 | Az Ausruest Zubehoer Gmbh | Thread forming connector |
AU4383296A (en) * | 1996-01-18 | 1997-08-11 | Werner Fluckiger | Distance screw |
DE19608859A1 (en) * | 1996-03-07 | 1997-09-11 | Hilti Ag | Anchor rod for composite anchors |
DE29906274U1 (en) * | 1999-04-08 | 1999-06-24 | A-Z Ausrüstung und Zubehör GmbH & Co. KG, 45525 Hattingen | Self-drilling and thread-forming connecting element |
US20030031528A1 (en) * | 2001-07-31 | 2003-02-13 | Kram Guenther Reinhard | Multi-mate fastener |
US7037059B2 (en) * | 2003-01-07 | 2006-05-02 | Altenloh, Brinck Co. Gmbh & Co. Kg | Self-tapping screw for composite materials |
JP4225546B2 (en) * | 2003-10-09 | 2009-02-18 | 株式会社青山製作所 | Tapping screw |
DE202004002877U1 (en) * | 2004-02-25 | 2005-06-30 | A-Z Ausrüstung Und Zubehör Gmbh & Co. Kg | Thread forming screw |
-
2016
- 2016-09-13 US US15/263,377 patent/US20180073547A1/en not_active Abandoned
-
2018
- 2018-07-26 US US16/045,773 patent/US20180335074A1/en not_active Abandoned
- 2018-07-26 US US16/045,776 patent/US10724571B2/en active Active
- 2018-07-26 US US16/045,775 patent/US10690173B2/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180149186A1 (en) * | 2016-11-29 | 2018-05-31 | Philip Bogrash | Bolts, Nuts and Fastener System |
Also Published As
Publication number | Publication date |
---|---|
US20180328399A1 (en) | 2018-11-15 |
US20180335074A1 (en) | 2018-11-22 |
US20180335075A1 (en) | 2018-11-22 |
US10724571B2 (en) | 2020-07-28 |
US10690173B2 (en) | 2020-06-23 |
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Legal Events
Date | Code | Title | Description |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |