WO2018152425A1 - Conception de filet auto-bloquant, anti-vibratoire, à formation de filet - Google Patents

Conception de filet auto-bloquant, anti-vibratoire, à formation de filet Download PDF

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Publication number
WO2018152425A1
WO2018152425A1 PCT/US2018/018524 US2018018524W WO2018152425A1 WO 2018152425 A1 WO2018152425 A1 WO 2018152425A1 US 2018018524 W US2018018524 W US 2018018524W WO 2018152425 A1 WO2018152425 A1 WO 2018152425A1
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WO
WIPO (PCT)
Prior art keywords
fastener
thread
stepped
angle
head
Prior art date
Application number
PCT/US2018/018524
Other languages
English (en)
Inventor
Joseph Schneider
Original Assignee
Mid-State Bolt and Nut Co., Inc.
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 Mid-State Bolt and Nut Co., Inc. filed Critical Mid-State Bolt and Nut Co., Inc.
Publication of WO2018152425A1 publication Critical patent/WO2018152425A1/fr

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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
    • F16B25/0036—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
    • F16B25/0047—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 ridge being characterised by its cross-section in the plane of the shaft axis
    • 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
    • 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
    • F16B25/0084—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 geometric details of the tip
    • 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
    • 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 to threaded fasteners, particularly to screw fasteners used to join two or more materials together.
  • fasteners are commonly used for connecting different materials together. It is desirable that fasteners achieve and maintain a tight grip and clamp between the materials being fastened.
  • One example is screws used to install base rails on truck trailers. In this application, the base rails are subject to a high degree of vibration, load and stress. Without the use of locknuts or thread locking patches, base rail screws are typically highly susceptible to losing their grip and disengaging from their installed position, which can jeopardize the stability of the base rail and the overall safety of the vehicle. This is but one example of why it is desirable to have a screw that can maintain a strong grip on the materials it connects while withstanding vibration and loosening and maintaining clamp.
  • a novel fastener which effects a firmer grip between two or more materials being fastened together, is durable, can be installed by a single operator, is extremely versatile, and avoids vibration and loosening while maintaining clamp.
  • a novel fastener is provided with a multi-angle thread that has a front flank with a 60- degree angle, and a back flank with an initial portion having an angle of 60 degrees and a secondary stepped portion having an angle of 30 degrees.
  • the angle degrees may vary, with the back flank comprised of two different angles or even three different angles.
  • the screw is comprised of a shank with a stepped thread along a predetermined portion of the screw and modified radial threads located on another portion of the screw, where the modified radial threads have flat roots.
  • the screw has stepped threads on a middle portion of the shaft, conventional threads on a portion of the shaft between the stepped threads and the point, and modified radial threads with flat roots on a portion of the shaft between the stepped threads and the head of the fastener.
  • a threaded fastener may have conventional threads, stepped threads, and radial threads in various configurations.
  • a screw may have stepped threads in a middle portion of the shank, with conventional threads on the outer portions of the shank.
  • the screw has a six-lobed recess in the screw head to allow the screw to be installed with a six-lobed screwdriver.
  • the bottom side of the head of the screw may be serrated to help the screw engage with the bearing surface and help the screw stay locked into place once fully installed.
  • the stepped threads in conjunction with other present threads, maintain the screw's grip on surrounding materials and make it unnecessary to use washers or nuts.
  • the screw may be made from hardened steel.
  • FIG. 1 is a side elevational view of a first embodiment of a screw fastener with stepped threads
  • FIG. 2 is a magnified view of outlined area 3 of Fig. 1 , and illustrates the stepped threads of the screw fastener of Fig. 1 ;
  • FIG. 3 is a right side cross-sectional view taken along line 4-4 of Fig. 1 , which illustrates the bottom side of the screw head;
  • FIG. 4 is a left end elevational view of the screw fastener of Fig. 1 ;
  • FIG. 5 is a magnified side sectional view of the head of the screw fastener of Fig. 1 , which illustrates the recessed lobe;
  • FIG. 6 is a right side elevational view showing the point of the screw fastener of Fig. 1 ;
  • FIG. 7 is a right side elevational view of an exemplary embodiment of a trilobular point for a screw fastener
  • FIG. 8 is a cross-sectional view showing a screw fastener according to the exemplary embodiment of Fig.1 installed into a steel plate;
  • FIG. 9 is a side elevational view of a second embodiment of a screw fastener
  • FIG. 10 is a side elevational view of a third embodiment of a screw fastener
  • FIG. 1 1 is a side elevational view of a steel cross member and end clip connected by multiple screw fasteners according to the embodiment of Fig. 1 ;
  • FIG. 12 is a side view of the steel cross member and end clip being held together by multiple screw fasteners according to the embodiment of Fig. 1 ;
  • FIG. 13 is a side exploded view of the steel cross member and end clip
  • FIG. 14 is a perspective view of eight screw fasteners according to the embodiment of Fig. 1 in a vibration test setup.
  • FIG. 15 is a vibration control plot generated from the test setup shown in FIG. 14.
  • Figure 1 illustrates an exemplary embodiment of a stepped thread 5, as part of a screw fastener of a first embodiment 10, which may be used to secure two or more materials together.
  • the stepped thread 5 is formed along a pre-determined portion of a fastener 10, where the fastener 10 has a first end 12 with a point 14 and a second end 16 with a head 18.
  • a shank 20 runs between the first end 12 and second end 16.
  • the stepped thread 5 begins at a predetermined axial length, L1 , from the point 14, and wraps around the shank 20 towards the head 18 for a predetermined additional axial length, L2.
  • a series of modified, flat-crested radial threads 22 are located along a predetermined axial length, L3 between the head 18 and the stepped thread 5.
  • the fastener has conventional threads 24.
  • Debris cleaning flutes 26 are located on the first end 12, causing gaps in the continuity of the conventional threads 24 along a distance L4.
  • four flutes 26 may be spaced evenly or substantially evenly around the diameter of the fastener 10.
  • the flutes 26 may be designed according to industry standard Type F. In other embodiments various numbers of flutes, spacing of flutes, and dimensions of flutes may be used as desired.
  • the stepped thread 5 exhibits multiple flank angles.
  • the front flank 28 (a first side) of each stepped thread 5 has a first flank side angle, 0 a , which in this exemplary embodiment is a 60-degree angle.
  • the back flank 30 of each stepped thread (a second side) 5 has an initial portion 32 with the same angle as the first flank side, 0 a , (in this exemplary embodiment a 60-degree angle), and a second stepped portion 34 angle, 0t>, (in this exemplary embodiment a 30-degree angle).
  • the "step down" from 60 degrees to 30 degrees on the back flanks 30 of the stepped threads 5 prevents the screw 10 from vibrating loose after installation.
  • the stepped thread 5 forms the self-locking feature, while the flat-crested radial threads 22 lock the fastener 10 into place.
  • the modified radial threads 22 as illustrated in Fig. 1 are comprised of a single continuous thread. Between the flat-crested radial threads 22 are flat roots 36 which help prevent the fastener 10 from becoming dislodged after installation. Both the modified radial threads 22 and the conventional threads 24 may exhibit 60 degree angles.
  • a fastener may have stepped threads in different locations along the screw shaft as necessary based upon the intended application.
  • the angles of the front flanks and initial and second portions of the back flanks may also differ.
  • the head 18 extends outward radially from the shank 20.
  • the head 18 has a top side 40 and a bottom side 42.
  • the bottom side 42 of the head 18 contains serrations 44 that provide additional locking strength between the screw 10 and the bearing surface with which it engages.
  • the serrations are adapted to cut into a fastened material in aid in locking.
  • the bottom side 42 of the head 18 may have a different number of serrations, or may even have no serrations.
  • the head 18 of the fastener 10 has a diameter D1.
  • the top side 40 of the head 18 is rounded, with a six-lobed recess 46 with major diameter D2 centrally located on the top side 40.
  • a tool such as a six-lobed screwdriver may be inserted into the recess 46 to induce rotation of the fastener 10 and aid in installation of the fastener 10.
  • the recess 46 may have a different number of lobes or a different shape as necessary to allow different tools to be used to install the screw. In some embodiments, there may be no recess at all, such as those embodiments having a hexagonal head shape.
  • an F Type tapping point 14 as used in the exemplary embodiment of Fig. 1 is shown.
  • the four flutes 26 allow the fastener 10 to grind the threads into a fastened material.
  • the tapping point used on a fastener may have a variety of points including a trilobular point.
  • a trilobular thread tapping point 48 of an exemplary embodiment of a fastener 50 is shown.
  • the trilobular thread tapping point 48 is capable of forming its own thread.
  • exemplary fastener embodiment of Fig. 1 has four debris cleaning flutes 26, in other embodiments different numbers and combinations of flutes, flats, and/or shank slots may be located on the point 14 to help allow the screw 10 to auger into a material.
  • a screw of the exemplary embodiment of Fig. 1 may have the following dimensions: an axial shank length L5 of 1 "; a conventional thread length L1 of .3125”; a stepped thread length L2 of .375"; a modified radial thread length L3 of .3125”; a head diameter D1 of 21 /32"; a head height L6 of .20”; a six-lobe recess major diameter D2 of .275"; a six-lobe recess depth L7 of .109", and a major shaft diameter D3 of .375" (3/8").
  • the overall length of the entire screw 10 may be 1 .2" long.
  • the thread count may be 16 threads per inch equally spaced apart.
  • the screw dimensions may be altered in numerous ways as desired without departing from the inventive concept, and the above example of dimensions is in no way limiting.
  • the overall length of the screw may be reduced to 3 ⁇ 4 inches.
  • a shorter screw length may not only result in less cost in manufacturing the screw, but also reduces the weight of a screw.
  • screws of a shorter length can reduce the added weight by several pounds. Such weight reduction is particularly favorable in at least the trucking industry where lessening the weight of a trailer can reduce fuel consumption.
  • FIG 8 a cross-sectional view of a fastener 10 according to the exemplary embodiment of Fig. 1 is shown as installed into a steel plate 105 containing a 0.323" diameter predrilled hole .
  • FIG. 9 a second embodiment of a screw 60 with stepped screw threads 62, flat-crested radial threads 66, and conventional threads 68, is illustrated.
  • This second embodiment 60 is similar to the first embodiment 10 except that it does not have debris cleaning flutes.
  • FIG. 10 a third embodiment of a screw 70 with stepped screw threads 72 is illustrated. This embodiment does not have modified flat-crested radial threads.
  • the screw 70 has conventional threads 74 on either side of the shank 76 for distances L8, L9, respectively, with stepped threads 72 located a distance of L10 along a middle portion of the shank 76.
  • screw threads of the embodiments of Figs. 1 , 9, and 10 have a single lead at their respective points, 14, 64, 78, in other embodiments the screw thread may have a single, double or quadruple lead as desired.
  • a stepped thread may be formed along the entire length of the shank of a screw.
  • the angles may be similar to those of the fastener of Figs. 1 or they may differ.
  • the front flank may be 60 degrees and the initial and secondary portions of the back flank may be 65 and 25 degrees, respectively.
  • the initial and secondary portions of the back flank may be 55 and 35, respectively.
  • both the front and back flanks of the thread may be sectioned into portions with varying angles.
  • the front and/or back portions of the stepped thread may have more than two sections with different angles.
  • the stepped threads are present on various types of threaded fasteners used in a wide variety of applications, including, but not limited to, thumb screws, pipe plugs, hanger bolts, step bolts, U-bolts, patch bolts, lag screws, carriage bolts, hook bolts, and wood screws.
  • thumb screws a screw
  • pipe plugs a pipe plug
  • hanger bolts a bolt that holds the stepped threads
  • step bolts U-bolts
  • patch bolts lag screws
  • carriage bolts carriage bolts
  • hook bolts and wood screws.
  • the stepped threads disclosed herein could be used in many threaded fastener applications across many different industries.
  • the stepped thread may be used as the only type of thread on such a fastener, or in conjunction with other threads on such fasteners.
  • heads of such fasteners may widely vary as well,
  • FIGs 11-13 illustrate how stepped thread screws 10 of the first exemplary embodiment may be used to fasten a steel cross-member 100 and an aluminum lower rail (base rail) 110.
  • the steel cross-member 100 and aluminum lower rail 110 are of a type commonly used in the construction of truck trailers, which are subject to a high amount of vibration during use.
  • the screws 10 may be installed through use of a hand or power tool that has an attachment corresponding to the six-lobed recess 46. It will be appreciated by one of ordinary skill in the art that embodiments of the screw may be used in a variety of applications, and used to connect different types of materials. Because the stepped-thread screw 10 is self-locking, there is no need for the screw to be used with a lock nut or lock washer.
  • stepped thread fasteners may be made from a material such as steel that undergoes case hardening. In many applications, it may be desirable to harden the steel to ensure that the fasteners are harder than the material they are installed into. However, in certain applications it may not be necessary to harden the steel. In other embodiments 410 stainless steel may be used, or a hardened aluminum. However, various other metal and non-metal materials may be used as desired, including plastics and ceramics. It is recognized that fasteners may be made from a variety of materials that are harder than the materials the fasteners are intended to be installed into.
  • An improved fastener with stepped threads according to the exemplary embodiment of Fig. 1 is tested against a standard fastener a nut.
  • the improved fastener has an axial shank length L5 of 1 "; a conventional thread length L1 of .3125”; a stepped thread length L2 of .375”; a modified radial thread length L3 of .3125”; a head diameter D1 of 21/32"; a head height L6 of .20”; a six-lobe recess major diameter D2 of .275"; a six-lobe recess depth L7 of .109", and a major shaft diameter D3 of .375" (3/8").
  • the overall length of the entire screw 10 is 1 .2" long.
  • the standard fastener does not have stepped threads, but rather has only conventional threads with an F-type point. Breakaway is tested for both fasteners as installed into an aluminum base rail and steel cross member for a truck trailer.
  • the material stackup consists of approximately .184 inch thick aluminum and .15 inch thick steel (total stackup of approximately .334 inches).
  • the standard fastener is a 3/8-16 X 1 1 ⁇ 4 button socket cap Gr. 5.1 Permeaplate 3/8-16 nylon stop nut cad /JD5. The standard fastener adheres to ASME B18.16.6 standards. The standard fastener does not have stepped threads.
  • the installation torque for first off is 45 in-lb, and the installation torque for fifth off is 55 in-lb.
  • the clamp load when seated at 600 in-lb is approximately 6,700 lbs.
  • the installation torque for first off is 21 6 in-lb, and the installation torque for fifth off is 240 in-lb.
  • the clamp load when seated at 600 in-lb is approximately 1 0,667 lbs.
  • Example 1 is a standard .375" - 16 X 1 " screw with conventional threads and a type F point, used with a nut.
  • Sample 2 is a .375" - 1 6 X 1 " improved fastener according to the exemplary embodiment of Fig. 1 , with the dimensions set forth in Example 1 , without a nut.
  • Proof load and tensile strength testing is conducted in accordance with ASTM Standard F606M using an Instron Model 3385H Universal Testing System.
  • Shear testing is performed in accordance with NASM 1 31 2-20 using an Instron Model 3385H Universal Testing system and shear fixture assembly shown in Fig. 3a of NASM 1 31 2-20.
  • Pull-out testing is performed using one combination of .1 25" thick steel and .1 85" thick aluminum plates and another combination of .01 85" thick aluminum plates to simulate the actual operating design that the screw would be subjected.
  • the plates contain .323" and .339" diameter holes and pull- out testing is accomplished using an Instron Model 3385H Universal Testing System.
  • a second pull-out test is accomplished using industry recognized fastener test plates, .340" thick, containing both .323" and .339" diameter holes.
  • the second round of pull-out testing is accomplished using an Instron Model 3385H Universal Testing System. Proof load is held for 1 0 seconds in accordance with ASTM Standard F606M Results of the test are shown in Tables 3 through 8 below.
  • the exemplary fastener (Sample #2) exceeded industry standard requirements. Without the use of a nut, the exemplary fastener also either out performed or similarly performed to the standard fastener (Sample #2).
  • a vibration test is performed on eight improved fasteners 10 according to the exemplary embodiment of Fig. 1 (with no nuts), with the dimensions set forth in Example 1 .
  • the testing method used was MIL-STD-810G, Method 514.6 ANNEX C, Figure 514.6C-1 -Category 4-Common carrier (US Highway truck vibration exposure) Vertical Axis Vibration profile.
  • Test time of 60 minutes 1 ,000 miles. Test setup is shown in Fig. 14.
  • Bolt positions are marked and visually checked for movement at the completion of the test. No obvious physical discrepancies are observed before, during, or upon completion of testing.
  • the eight fasteners 10 remain in position during testing.
  • the vibration control plot for the test is shown in Fig. 15. For this test the parameters are:
  • FIG. 1 An exemplary fastener of Fig. 1 (with no nut), with the dimensions set forth in Example 1 , is subject to tensile strength testing to measure elongation.
  • the SAE Standard J429 “Mechanical and Material Requirements for Externally Threaded Fasteners” Grade 5.1 requirements for a .375"-16 screw are applied.
  • the testing is conducted in accordance with ASTM Standard F606M using an Instron Model 3385 Universal Testing System. The result is shown in Table 8 below:

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
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  • Connection Of Plates (AREA)

Abstract

L'invention concerne un élément de fixation à filets variables. La tige de l'élément de fixation comporte un filet étagé le long d'une partie centrale, flanquée de filets classiques sur l'extrémité pointe, et des filets radiaux modifiés dotés de racines plates à proximité de la tête. Les filetages étagés ont un flanc avant à un angle de 60 degrés, et un flanc arrière avec une partie filetée initiale ayant un angle de 60 degrés et une partie de filet secondaire ayant un angle de 30 degrés. La vis comporte plusieurs cannelures de nettoyage de débris à son extrémité pointe. La tête de l'élément de fixation comporte un évidement à six lobes, et des dentelures sur son côté inférieur.
PCT/US2018/018524 2017-02-16 2018-02-16 Conception de filet auto-bloquant, anti-vibratoire, à formation de filet WO2018152425A1 (fr)

Applications Claiming Priority (2)

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US201762460010P 2017-02-16 2017-02-16
US62/460,010 2017-02-16

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1300801A (en) * 1918-07-12 1919-04-15 Irving C Woodward Self-locking screw-thread.
US4540321A (en) * 1978-11-16 1985-09-10 Microdot Inc. Anti-vibration thread form
US20130230364A1 (en) * 2010-11-22 2013-09-05 Shigeto Mori Loosening prevention threaded fastener
US20150010374A1 (en) * 2013-03-26 2015-01-08 Simpson Strong-Tie Company, Inc. Variable thread fastener
US20160153486A1 (en) * 2013-07-03 2016-06-02 Songlin Xu Anti-loosening threaded part
US20170030393A1 (en) * 2015-07-31 2017-02-02 Infastech Intellectual Properties Pte. Ltd. Threaded fastener

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1300801A (en) * 1918-07-12 1919-04-15 Irving C Woodward Self-locking screw-thread.
US4540321A (en) * 1978-11-16 1985-09-10 Microdot Inc. Anti-vibration thread form
US20130230364A1 (en) * 2010-11-22 2013-09-05 Shigeto Mori Loosening prevention threaded fastener
US20150010374A1 (en) * 2013-03-26 2015-01-08 Simpson Strong-Tie Company, Inc. Variable thread fastener
US20160153486A1 (en) * 2013-07-03 2016-06-02 Songlin Xu Anti-loosening threaded part
US20170030393A1 (en) * 2015-07-31 2017-02-02 Infastech Intellectual Properties Pte. Ltd. Threaded fastener

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