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Claim-Tree: Self-Locking Fastener

Ein vollständiger Claim-Baum für ein mechanisches Schrauben-Sicherungssystem — generiert von ClaimForge aus einer einfachen Offenbarung.

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Invention Disclosure Input A self-locking threaded fastener assembly comprising a bolt with a helical groove along its shank and a nut with an internally threaded bore configured to engage the groove. The assembly includes a locking insert made of a compressible polymer material positioned within an annular recess in the nut body. Upon tightening, the polymer insert deforms radially inward, creating a friction-based retention force that prevents loosening under vibration. The insert is replaceable without special tooling. The groove geometry uses a dual-lead thread profile that distributes axial load across two contact lines, reducing peak stress by approximately 40% compared to single-lead profiles. A locking torque of 5–25 Nm is achieved depending on insert durometer selection.

Feature-Mapping (6 Features)

Dual-Lead Thread Profile primary
A helical groove geometry with two parallel thread leads that distributes axial load across two contact lines, reducing peak stress by ~40% versus single-lead profiles.
C1 C1.2 C1.5 C2 C2.3
Compressible Polymer Locking Insert primary
An elastomeric ring positioned in an annular nut recess that deforms radially inward upon bolt engagement to generate vibration-resistant friction retention.
C1 C1.3 C1.6 C2 C2.2
Annular Recess Housing primary
Machined groove inside the nut bore that seats and positions the locking insert, enabling controlled deformation geometry.
C1 C2
Tool-Free Insert Replacement secondary
Locking insert can be extracted and replaced by hand without special tooling, enabling field serviceability.
C1.1 C1.4 C2.1 C2.4
Durometer-Tunable Locking Torque secondary
Selecting insert Shore A hardness (40–90) tunes locking torque across 5–25 Nm, allowing application-specific configuration.
C1.3 C2.2
Friction-Based Retention Mechanism primary
Retention relies on radial compressive friction rather than thread deformation or chemical locking, preserving bolt/nut integrity through multiple cycles.
C1 C2 C2.5

Claim-Baum — 2 Independent Claims, 12 Dependent Claims

C1
apparatus
A self-locking fastener assembly, comprising: a bolt including a shank having a dual-lead helical groove formed thereon, wherein the dual-lead groove defines first and second thread leads distributed circumferentially to provide two axial load-bearing contact lines; a nut having an internally threaded bore configured to mate with the dual-lead helical groove of the bolt; an annular recess formed in an inner bore of the nut; and a locking insert comprising a compressible polymer material positioned within the annular recess, the locking insert configured to deform radially inward upon engagement with the bolt shank to generate a friction-based retention force resisting rotational loosening of the nut.
Spec-Anchor
"a locking insert made of a compressible polymer material positioned within an annular recess in the nut body"
C1.1 ↳ depends on C1
The fastener assembly of claim C1, wherein the locking insert is removably disposed within the annular recess such that the locking insert is replaceable without the use of specialized tooling.
Spec-Anchor: "The insert is replaceable without special tooling"
C1.2 ↳ depends on C1
The fastener assembly of claim C1, wherein the dual-lead thread profile is configured to distribute axial load such that peak thread stress is reduced by at least 35% compared to a single-lead thread profile of equivalent pitch diameter.
Spec-Anchor: "reducing peak stress by approximately 40% compared to single-lead profiles"
C1.3 ↳ depends on C1
The fastener assembly of claim C1, wherein the locking insert has a Shore A durometer in the range of 40–90, wherein selection of durometer determines a locking torque in the range of 5–25 Newton-meters.
Spec-Anchor: "locking torque of 5–25 Nm is achieved depending on insert durometer selection"
C1.4 ↳ depends on C1.1
The fastener assembly of claim C1.1, wherein the locking insert is retained within the annular recess by an interference fit, the interference fit being dimensioned to permit manual extraction without mechanical assistance.
Spec-Anchor: "The insert is replaceable without special tooling"
C1.5 ↳ depends on C1.2
The fastener assembly of claim C1.2, wherein each of the two axial load-bearing contact lines has a contact width of at least 0.5 mm measured in the axial direction of the bolt.
Spec-Anchor: "distributes axial load across two contact lines"
C1.6 ↳ depends on C1
The fastener assembly of claim C1, wherein the compressible polymer material comprises a thermoset elastomer selected from the group consisting of nitrile rubber, fluoroelastomer, and silicone.
Spec-Anchor: "a locking insert made of a compressible polymer material"
C1.7 ↳ depends on C1
The fastener assembly of claim C1, wherein the nut further comprises a visual wear indicator on an exterior surface of the annular recess, the indicator providing a visible signal when the locking insert has compressed beyond a threshold deformation.
Spec-Anchor: "Upon tightening, the polymer insert deforms radially inward"
C2
method
A method of securing components against vibration-induced loosening, comprising: providing a bolt having a shank with a dual-lead helical groove defining two axial load-bearing contact lines; engaging a nut having an internally threaded bore with the dual-lead helical groove of the bolt; positioning a compressible polymer locking insert within an annular recess in the nut prior to engagement; and tightening the nut to a target torque such that the locking insert deforms radially inward into contact with the bolt shank, generating a friction-based retention force sufficient to maintain the nut position under vibratory loading.
Spec-Anchor
"Upon tightening, the polymer insert deforms radially inward, creating a friction-based retention force that prevents loosening under vibration"
C2.1 ↳ depends on C2
The method of claim C2, further comprising: removing the locking insert from the annular recess after a service interval; and installing a replacement locking insert into the annular recess without applying a torque-setting tool.
Spec-Anchor: "The insert is replaceable without special tooling"
C2.2 ↳ depends on C2
The method of claim C2, wherein the target torque is selected from the range of 5–25 Newton-meters based on a Shore A durometer of the compressible polymer locking insert.
Spec-Anchor: "locking torque of 5–25 Nm is achieved depending on insert durometer selection"
C2.3 ↳ depends on C2
The method of claim C2, further comprising verifying that the dual-lead helical groove distributes an axial bolt load across at least two distinct contact lines to reduce peak thread stress relative to a single-lead engagement.
Spec-Anchor: "distributes axial load across two contact lines, reducing peak stress by approximately 40%"
C2.4 ↳ depends on C2.1
The method of claim C2.1, wherein removing the locking insert comprises applying a radially outward extraction force not exceeding 50 Newtons without heating or chemical dissolution of the insert.
Spec-Anchor: "The insert is replaceable without special tooling"
C2.5 ↳ depends on C2
The method of claim C2, wherein the vibratory loading is characterized by a frequency in the range of 5–200 Hz and an amplitude sufficient to produce a Junker test loosening of greater than 10% nut rotation in a reference single-lead fastener within 1000 load cycles.
Spec-Anchor: "prevents loosening under vibration"
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