US20170023045A1 - Fastening system allowing component removal after fastener system failure - Google Patents

Fastening system allowing component removal after fastener system failure Download PDF

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Publication number
US20170023045A1
US20170023045A1 US15/176,078 US201615176078A US2017023045A1 US 20170023045 A1 US20170023045 A1 US 20170023045A1 US 201615176078 A US201615176078 A US 201615176078A US 2017023045 A1 US2017023045 A1 US 2017023045A1
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Prior art keywords
nut
fastening system
bolt
fiber
retainer
Prior art date
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Abandoned
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US15/176,078
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English (en)
Inventor
Michael A. Lemacks
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.)
Channell Commercial Corp
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Channell Commercial Corp
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Filing date
Publication date
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Priority to US15/176,078 priority Critical patent/US20170023045A1/en
Priority to CA2932633A priority patent/CA2932633C/en
Assigned to CHANNELL COMMERCIAL CORPORATION reassignment CHANNELL COMMERCIAL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEMACKS, MICHAEL A.
Publication of US20170023045A1 publication Critical patent/US20170023045A1/en
Assigned to BANK OF AMERICA, N.A. reassignment BANK OF AMERICA, N.A. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHANNELL COMMERCIAL CORPORATION
Assigned to Channell Commerical Corporation reassignment Channell Commerical Corporation RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANK OF AMERICA, N.A.
Abandoned legal-status Critical Current

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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
    • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
    • 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
    • F16B37/00—Nuts or like thread-engaging members
    • 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
    • F16B33/006—Non-metallic fasteners using screw-thread
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
    • E02D29/14—Covers for manholes or the like; Frames for covers
    • 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
    • F16B31/00—Screwed connections specially modified in view of tensile load; Break-bolts
    • F16B31/02—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load
    • F16B31/021—Screwed connections specially modified in view of tensile load; Break-bolts for indicating the attainment of a particular tensile load or limiting tensile load by means of a frangible part
    • 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
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set 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
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/005—Nuts or like thread-engaging members into which threads are cut during screwing
    • 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
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
    • F16B37/041—Releasable devices
    • F16B37/042—Releasable devices locking by rotation
    • 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
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
    • F16B37/044—Nut cages
    • 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
    • F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • 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
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/02—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread
    • F16B5/0216—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread the position of the plates to be connected being adjustable
    • F16B5/0225—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of fastening members using screw-thread the position of the plates to be connected being adjustable allowing for adjustment parallel to the plane of the plates
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00—Miscellaneous
    • E02D2600/20—Miscellaneous comprising details of connection between elements

Definitions

  • the Invention relates to a fastener system for a lid or cover used on an underground or grade-level vault used in various underground industries.
  • Underground or buried vaults, pits chambers or boxes used in the utilities, security, and rail line sectors or other industries can contain co-axial or optical fiber, copper cable as well as gas and power lines and other conduits, industrial valves. WI-FI antennas, etc.
  • Vaults and pits for underground utilities often need to be opened for making repairs or for enhancing services.
  • utility vaults and pits include a concrete, polymer concrete, or plastic lid which is opened by a tool or pick with a hook at one end. The hook is inserted through a hole in the lid or cover and is used for prying the lid or cover away from it's opening atop the vault or pit.
  • the cover or lid may be installed at approximately grade level.
  • These covers or lids of various materials such as plastic, concrete, polymer concrete and fiber reinforced composites are secured in place by various means such as straight bolts or L-bolts etc.
  • the bolt typically passes through the cover and into the underground box where it is screwed into a retained nut or similar device thus fastening the cover to the box.
  • This fastening system is highly prone to failure and a great many of the installed box/cover units are deliberately damaged to regain entry into the box chamber and access internal infrastructure such as copper or fiber-optic enclosures.
  • the damage is typically, but not limited to, breaking the corners of the cover where the bolts which are typically positioned onto opposing corners attach the cover to the box.
  • the fastening system of the present invention provides for two types of nut retention designs deployed within underground boxes and covers wherein one is a fixed nut attachment to the box where the nut remains stationary, and the second is a floating nut design where the nut is allowed to move within a track or cage in the box to compensate for some degree of misalignment.
  • the failure mode of the fastening system of the present invention has been moved to the threads contained by the nut such that the bolt, nut retainer and nut attachment points remain intact.
  • the nut strips out without damaging anything else.
  • the materials used for the nut are of a composite type such as, but not limited to, glass-filled nylon which exhibits good strength but allows the nut threads to sheer prior to any other mode of failure.
  • the fastener By controlling the length of thread engagement and the hole diameter relative to the bolt diameter, the fastener is able to meet torque requirements and still allow the nut threads to fail first.
  • the desired failure mode is achieved. Due to the high-stress risers in the nut during thread formation, appropriate lead chamfers are required to prevent fracture of the nuts, typically a 45 degree chamfer of 1/16th inch to 1 ⁇ 8th inch across the flat.
  • FIG. 1 the top view of the fastening system of the present invention
  • FIG. 2 is a partial cross-sectional view of the fastenings system of FIG. 1 ;
  • FIG. 3 is a partial cross-sectional view of an alternative embodiment fastening system
  • FIG. 4 is a perspective view of an underground vault, pit, chamber or box having a lid or cover attached by the fastening system of FIG. 1 or 3 ;
  • FIG. 5 is a cross sectional view of FIG. 4 .
  • the fastening system 10 of the present invention comprises a bolt 12 , a nut 14 and a nut retainer 16 .
  • the fastening system 10 is utilized to attach a lid or cover to an underground or grade-level vault, pit, chamber or box which will be discussed in more detail subsequently herein.
  • Bolt 12 is typically a lag bolt having course threads 18 for engagement with complimentary threads 20 on the nut 14 positioned in a thread engagement section 22 of a hole 24 extending through the nut.
  • the bolt 12 includes a head 19 which can be a traditional head design or can include tamper-resistant features such as, for example, a Penta head design which requires specialized tools to manipulate.
  • Threads 20 on the nut are of complimentary size to threads 18 on the bolt.
  • Hole 24 extending through the nut includes a bolt lead-in chamfer 26 extending to a bolt alignment section 28 which extends to a thread lead-in chamfer 30 positioned between bolt alignment section 28 and thread engagement section 22 .
  • a lead-out chamfer 32 extends from the thread engagement section to a bolt shroud section 34 of the nut.
  • the nut further includes lobes 36 and 38 on either side of an upper portion of the nut adjacent lead-in chamfer 26 and bolt alignment section 28 .
  • the nut 14 is positioned within a nut retainer 16 which includes a cavity 40 which is oversized compared to the lobed portion of the nut so that there is clearance between the cavity and the lobes on the sides and the bottom surface, in essence allowing the nut to float within the cavity 40 .
  • the cavity 40 includes a hole 42 so that the remainder of the nut, namely the thread engagement section and the bolt shroud sections can extend through the retainer.
  • the diameter of hole 42 is smaller than the outside dimensions of the lobes so that the upper portion of the nut is retained within the cavity.
  • the nut retainer 16 further includes bosses 44 and 46 positioned on either side for receipt of screws 48 and 49 for attaching the retainer to the vault as will be discussed subsequently herein.
  • the fastening system 10 of FIGS. 1 and 2 is a floating nut version where the nut is allowed to move within the retainer to compensate for some degree of misalignment of the components being fastened together.
  • FIG. 3 illustrates an alternative embodiment fastening system 50 which utilizes a fixed nut 52 and a bolt 54 .
  • Fastening system 50 does not utilize a nut retainer as with fastening system 10 as fixed nut 52 includes holes 56 and 58 for receipt of screws 60 and 62 respectively for rigidly fixing the nut to one of the components to be fastened together as will be discussed in more details subsequently herein.
  • Fixed nut 52 otherwise is similar to nut 14 having a bolt lead-in chamfer 64 , a bolt alignment section 66 , a thread lead-in chamfer 68 , a thread engagement section 70 having threads 72 , a bolt shroud section lead-out chamfer 74 and a bolt shroud section 76 all within hole 78 extending through the nut.
  • Both embodiments of the fastening system of the present invention have been designed for attaching a lid or cover 80 to and vault, pit, chamber or box 82 as shown in FIGS. 4 and 5 .
  • the lids 80 can be made from concrete, polymer concrete, cast iron, galvanized steel or plastic and more recently from a fiber glass reinforced polymer matrix material consisting of an unsaturated polyester thermosetting resin matrix, glass fiber reinforcement and inorganic or mineral filler.
  • the vaults 82 can also be made from any of these materials.
  • the cover or lid 80 includes through-holes 84 and 86 positioned in opposing corners of the lid.
  • fastener 10 is illustrated as being positioned through through-hole 84 and fastener 50 is positioned through through-hole 86 .
  • fastener 10 is illustrated as being positioned through through-hole 84 and fastener 50 is positioned through through-hole 86 .
  • nut retainer 16 would be fastened to a perimeter ledge of an inside wall of the vault so that bolt 12 would be threaded into nut 14 positioned below the lid.
  • Bolt 19 would secure the lid to the ledge of the vault.
  • Fastener system 50 would entail securing fixed nut 52 to the ledge of the inner wall such that bolt 54 would be threaded into the nut through thru-hole 86 thereby clamping the lid onto the vault.
  • An advantage of the present invention fastening system is that the failure mode of the system has been moved to the threads contained by the nut such that the bolt, nut retainer and nut attachment points remain intact allowing essentially the nut to strip out without damaging anything else and the bolt can still be removed.
  • the desired mode of failure is realized and the properties of the failure mode are designed to allow the threads and the nut to strip out prior to any other failure mode. This is accomplished by manufacturing the nuts out of a composite material such as, but not limited to, glass filled nylon which exhibits good strength but allows the nut threads to sheer prior to any other mode of failure.
  • the fastening system By controlling the length of thread engagement and the hole diameter relative to the bolt diameter the fastening system is able to meet standard torque requirements and still allow the nut threads to fail first when over-torqued. Consequently adjustments of the material, hole diameter and thread engagement can be designed to achieve the desired result. Due to high-stress risers in the nut during thread formation, the lead-in and lead-out chamfers prevent fracture of the nut and the chamfers can be 45 degrees having a 1/16th inch to 1 ⁇ 8th inch length across the flat.
  • the very course leg bolt type threads are utilized for the thread engagement section of the nut as they are ideal at forming threads and composites allowing the nut material to achieve high-torque limits required but ultimately cause the nut-threads to fail in sheer.
  • the composite material and design geometries of the nut work in a complimentary way such that the bolt can be removed even after the threads and the nut have been stripped. Further, in most instances the bolt can be reinstalled and removed albeit at a much lower level of clamping load. This is particularly useful when replacement parts are not immediately available and the bolts still provides some level of tamper resistance for the cover and vault assembly until repair can ultimately be achieved.
  • Another advantage of the fastening system of the present invention is that the composite materials and the thread geometries greatly negate the effects of particulate in the nut and bolt thread interface.
  • a more compliant but resilient material utilized for the nut allows for particulates to somewhat press into the nut material without significant damage, coupled with a very course bolt thread preventing the bolt and nut threads being locked together.
  • the fastener system is self-clearing.
  • the composite materials utilized for the nut include glass fiber-filled nylons or similar engineered plastics with fiber or particulate fillers.
  • Such fillers could include aramid fibers such as Kevlar and Nomex, carbon fiber, various glass fibers, boron, metal strands and tungsten which give a material to grind the particulates against as the bolt is driven into the nut. It is the combination of resilience of the polymer and the hardness and the edginess of the filler that prevents the nut from seizing and the particulates to be ground into smaller sizes and preventing seizure of the fastening system.
  • hard particulates can be integrated into the composite matrix such as carbides, ceramics, or minerals such as garnet and sapphire and others such that they act as a medium for the particulates to be ground against.
  • FIGS. 1 and 2 or the floating nut version Another advantage of the fastening system of FIGS. 1 and 2 or the floating nut version is that the composite material and geometry selections ensures that the failure mode occurs at the nut threads and not at the nut and nut retainer interface.
  • Prior fastening systems provided a failure scenario where the nut would spin within the retainer when the nut and bolt thread seized together thus preventing removal of the bolt.
  • the composite material selection and geometry of fastening system 10 ensures that the threads fail first making certain the ability to remove the cover in the event of failure.
  • lobes 36 and 38 provide for clearance in the X, Y and Z axis to accommodate misalignment in the X and Y axis along with angular misalignment.
  • Such geometries could include one, or more than two protrusions or lobes that mesh between the nut and the retainer, zero thrust angle interfaces or splines which are all designed to allow for relative movement between the nut and the nut retainer while exhibiting the ability to remain intact until after the nut threads fail in sheer loading.
  • the bolt alignment section of the nut approximates the outer diameter of the bolt and aligns the bolt prior to entering the threaded alignment section. Self-aligning features are common on bolts but not on nuts.
  • the bolt alignment section assures the bolt enters the nut at near co-alignment of the bolt shaft with the nut centerline, which yields consistent torque to seating values and torque to failure values.
  • Another advantage of the fastening system of the present invention is the incorporation of the bolt shroud section in the nut which covers the portion of the bolt that extends past the threaded engagement section. This is important for uses in vault applications requiring all metal components to be covered for electrical conduction reasons and also provides physical protection for the bolt.
  • Another advantage of the fastening system of the present invention is that the composite material for the nut dramatically increases the torque to remove the bolt from the nut and substantially improves resistance to loosening from vibration or other stresses. Due to the enhanced prevailing torque feature for the fastening system of the present invention very low torque can be applied to the fastening system without the individual components loosening. The result is that very low axial compression or even zero axial compression is required to keep the fastening system in place. This is particularly advantageous when mating composites or other crush sensitive materials. The sensitive component can be joined to other crush sensitive materials or to non-crush sensitive materials without damage or concern about them becoming loose over time due to vibration, expansion/contraction cycles, joint compression creep or stress relaxation.
  • fastening system of the present invention has been developed for application in underground or grade level containment box and cover systems
  • the fastening system has wide spread application in nut/bolt fastening systems and is to be understood that the invention is equally applicable to all scenarios where two components are to be joined and is not to be limited to only utility vault/cover applications.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Structural Engineering (AREA)
  • Connection Of Plates (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Bolts, Nuts, And Washers (AREA)
  • Numerical Control (AREA)
  • Power Steering Mechanism (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Lining And Supports For Tunnels (AREA)
  • Clamps And Clips (AREA)
US15/176,078 2015-07-20 2016-06-07 Fastening system allowing component removal after fastener system failure Abandoned US20170023045A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US15/176,078 US20170023045A1 (en) 2015-07-20 2016-06-07 Fastening system allowing component removal after fastener system failure
CA2932633A CA2932633C (en) 2015-07-20 2016-06-10 Fastening system allowing component removal after fastener system failure

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Application Number Priority Date Filing Date Title
US201562194716P 2015-07-20 2015-07-20
US15/176,078 US20170023045A1 (en) 2015-07-20 2016-06-07 Fastening system allowing component removal after fastener system failure

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US15/177,277 Active 2037-01-28 US10288106B2 (en) 2015-07-20 2016-06-08 Fastening system allowing component removal after fastener system failure

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EP (1) EP3121463B1 (da)
JP (1) JP6267283B2 (da)
KR (1) KR101965479B1 (da)
CN (1) CN106369035B (da)
AP (1) AP2016009311A0 (da)
AU (1) AU2016204289B2 (da)
BR (1) BR102016015861B1 (da)
CA (1) CA2932633C (da)
CL (1) CL2016001798A1 (da)
CR (1) CR20160325A (da)
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CN110566550A (zh) * 2019-09-12 2019-12-13 攀钢集团攀枝花钢钒有限公司 螺钉连接结构
US12603485B2 (en) 2023-02-17 2026-04-14 Htz Solutions Llc Underground enclosure assembly and method

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CA3036247A1 (en) * 2018-03-15 2019-09-15 Hubbell Incorporated Lightweight molded cover
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CN109502047B (zh) * 2018-12-18 2022-01-25 贵州贵飞飞机设计研究院有限公司 一种用于飞机结构单面连接不合格螺栓孔的补偿方法
US11566654B2 (en) * 2018-12-19 2023-01-31 Whirlpool Corporation Integrally formed thread lock retention feature
US11299897B1 (en) * 2019-01-17 2022-04-12 Shane L. Saia Apparatus, system, and method for assembling, aligning, leveling, and squaring in-ground pool walls
CN111181103A (zh) * 2020-01-03 2020-05-19 扬州朗日新能源科技有限公司 一种插接式接线盒
CN111130036A (zh) * 2020-01-09 2020-05-08 扬州朗日新能源科技有限公司 一种卡接式接线盒
CN111049081A (zh) * 2020-01-09 2020-04-21 扬州朗日新能源科技有限公司 一种套接式接线盒
CN112276151A (zh) * 2020-10-28 2021-01-29 中国航发贵州黎阳航空动力有限公司 一种六角螺母六方锁丝孔钻孔通用装置
CN113722861B (zh) * 2021-09-07 2023-07-18 北京航空航天大学 一种复合材料螺栓连接结构的强度和失效模式的预测方法

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US12603485B2 (en) 2023-02-17 2026-04-14 Htz Solutions Llc Underground enclosure assembly and method

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