Derivative works — US Patent 12031784

Defensive Disclosure Document for U.S. Patent No. 12,031,784

Publication Date: April 27, 2026
Subject: Derivative Embodiments and Obvious Variations of a Locking Member with a Separately Movable, Deflectable Portion for Forced Reset Trigger Mechanisms.
Reference Patent: U.S. Patent No. 12,031,784 B1 ("the '784 patent")

This document discloses a series of derivative inventions and technical variations based on the core principles described in the '784 patent. The purpose of this disclosure is to place these variations into the public domain, thereby establishing prior art against future patent applications claiming these or similar concepts. The core concept of the reference patent is a trigger locking member comprising a main body and an upwardly extending, separately movable deflectable portion for one-way actuation by a reciprocating bolt carrier.

Derivations Based on Independent Claim 1

Core Claim 1: A locking member for a forced reset trigger movable between a locked and unlocked position, actuated by a bolt carrier, and having a main body and an upwardly extending deflectable portion that is separately movable relative to the body.

Axis 1: Material & Component Substitution

1. Magnetically-Repelled Deflectable Member

Enabling Description: The hinged, upwardly extending deflectable portion and its corresponding mechanical spring (e.g., torsion spring 28) are replaced with a non-contact magnetic system. The deflectable portion is fabricated from a ferrous material or embedded with a permanent magnet (e.g., Neodymium N52). The main body of the locking member houses a second, opposing permanent magnet. The poles are oriented to create a repelling force, which biases the deflectable portion toward its extended, upright position. Upon contact with the rearward-traveling bolt carrier, the deflectable portion pivots against this magnetic repulsion, then snaps back to the extended position once the carrier has passed. This eliminates mechanical wear associated with a spring and pivot pin.

Mermaid Diagram:

graph TD
    A[Bolt Carrier - Rearward Travel] --> B{Contact};
    B --> C[Deflectable Portion with Magnet 1];
    C --> D{Overcomes Magnetic Repulsion};
    D --> E[Pivots Away];
    subgraph Locking Member Body
        F[Main Body with Magnet 2]
    end
    C -.-> F;
    E --> G[Bolt Carrier Passes];
    G --> H{Magnetic Repulsion Resets Portion};
    H --> I[Returns to Extended Position];

2. Shape-Memory Alloy (SMA) Deflectable Member

Enabling Description: The entire upwardly extending portion is fabricated from a shape-memory alloy, such as Nickel Titanium (Nitinol). The "memory" state of the alloy is set to the upright, extended position. The deflectable portion is engineered to be in its malleable, martensitic phase at the firearm's standard operating temperature. Contact from the bolt carrier deforms the member into the deflected position. The slight temperature increase from the friction of the carrier's passage, combined with the material's superelastic properties, causes an immediate phase transformation back to the rigid, austenitic state, returning the member to its upright "memory" position. This creates a solid-state "hinge" with no moving parts.

Mermaid Diagram:

stateDiagram-v2
    [*] --> Extended_Austenite: Initial State
    Extended_Austenite --> Deformed_Martensite: Bolt Carrier Contact (Stress-induced)
    Deformed_Martensite --> Extended_Austenite: Bolt Carrier Passes (Stress removed, superelastic recovery)

3. Laminated Composite Deflectable Member with Integral Leaf Spring

Enabling Description: The deflectable portion is not a separate, hinged component but is monolithically integrated with the main body. The entire locking member is fabricated from a laminated composite, such as layers of carbon fiber and a high-impact polymer (e.g., PEEK). The upwardly extending portion is designed with a localized reduction in thickness or a specific fiber orientation (e.g., 0/90 layup in the body, +/- 45 layup at the flex point) to create an integral leaf spring. This section is rigid enough to transfer force when pushed forward by the bolt carrier but flexible enough to bend rearward when contacted from the front, then snap back to its original position.

Mermaid Diagram:

classDiagram
    class LockingMember {
        +mainBody: RigidComposite
        +flexZone: IntegralLeafSpring
        +contactFace: HardenedInsert
    }
    LockingMember "1" *-- "1" RigidComposite
    LockingMember "1" *-- "1" IntegralLeafSpring
    class RigidComposite {
        +material: Carbon/PEEK_Laminate
        +layup: [0, 90]
    }
    class IntegralLeafSpring {
        +material: Carbon/PEEK_Laminate
        +layup: [45, -45]
    }

Axis 2: Operational Parameter Expansion

4. Cryogenic/High-Temperature Operation

Enabling Description: For operation in extreme temperature environments (-70°C to +300°C), the locking member and its components are fabricated from materials with low thermal expansion and high durability across this range. The body and deflectable portion are machined from a cobalt-chrome alloy (e.g., Stellite 6) or a precipitation-hardened stainless steel (e.g., 17-4 PH in H900 condition). The pivot pin is replaced by a ceramic pin (e.g., silicon nitride), and the torsion spring is fabricated from Inconel 718 to prevent loss of temper at high temperatures and brittle fracture at cryogenic temperatures.

Mermaid Diagram:

graph TD
    subgraph Environment [-70°C to +300°C]
        A[Locking Member]
    end
    A -- consists of --> B(Body: Stellite 6);
    A -- consists of --> C(Deflectable Portion: Stellite 6);
    A -- consists of --> D(Pivot: Silicon Nitride);
    A -- consists of --> E(Spring: Inconel 718);

5. Nanoscale Mechanical Latching System

Enabling Description: The invention is scaled down for use in micro-electro-mechanical systems (MEMS). The locking member is a silicon cantilever etched from a substrate, measuring micrometers in length. The "deflectable portion" is a nano-etched flexible tip. The "bolt carrier" is a reciprocating actuator on the MEMS device. Actuation is achieved through electrostatic force. When the actuator moves forward, it pushes the entire cantilever (locking member) to unlock a micro-gear. When the actuator retracts, it brushes past the flexible tip, which deflects without moving the main cantilever body. This enables one-way mechanical logic gates in MEMS devices.

Mermaid Diagram:

sequenceDiagram
    participant Actuator as Reciprocating Actuator
    participant LockingArm as Silicon Cantilever Arm
    participant FlexTip as Nano-etched Tip
    participant Gear as Micro-Gear

    Actuator->>LockingArm: Pushes forward (Unlocks Gear)
    LockingArm->>Gear: Moves to release
    Actuator->>FlexTip: Retracts, contacts tip
    FlexTip-->>FlexTip: Deflects
    Note right of FlexTip: Main LockingArm does not move
    Actuator->>Actuator: Completes retraction
    FlexTip-->>FlexTip: Returns to position

Axis 3: Cross-Domain Application

6. Aerospace: One-Way Latch for Deployable Solar Arrays

Enabling Description: The mechanism is adapted as a one-way retention latch for deployable structures on satellites, such as solar panels or antennas. A reciprocating deployment boom acts as the "bolt carrier." During deployment, the boom pushes forward against the locking member's deflectable portion, causing the entire member to pivot and release the panel from its stowed position. Should the boom need to be retracted for testing or to clear a jam, it can move rearward past the locking member, which will deflect out of the way without re-latching the panel. This prevents accidental stowing during a partial retraction.

Mermaid Diagram:

flowchart LR
    subgraph Stowed
        A[Solar Panel] -- Latched by --> B[Locking Member];
    end
    subgraph Deployment
        C[Deployment Boom] -- Pushes --> D(Deflectable Portion);
        D -- Causes --> E{Entire Member Pivots};
        E -- Unlocks --> A;
    end
    subgraph Retraction Test
        F[Boom Retracts] -- Contacts --> D;
        D -- Only Portion -> G[Deflects];
        G -- Allows --> F;
        B -- Stays -> H[Unlocked Position];
    end

7. Agricultural Tech: Gate Latch for Automated Herding Systems

Enabling Description: The mechanism is used as a gate latch in an automated livestock sorting facility. An automated pusher arm (the "bolt carrier") guides an animal toward a gate. The arm pushes the locking member to unlatch the gate, allowing the animal to pass through. Once the animal is through, the arm retracts. As it retracts, its lower edge contacts the deflectable portion of the locking member, which folds away, allowing the arm to pass without re-engaging the gate's lock. The gate can then be closed by a separate spring mechanism, ready for the next animal.

Mermaid Diagram:

sequenceDiagram
    participant PusherArm as Automated Pusher
    participant Animal as Livestock
    participant GateLatch as Locking Member
    participant Gate as Sorting Gate

    PusherArm->>Animal: Guides Animal
    Animal->>Gate: Moves toward gate
    PusherArm->>GateLatch: Pushes Latch (Unlock)
    GateLatch->>Gate: Opens
    Animal->>Gate: Passes through
    PusherArm->>GateLatch: Retracts, contacts deflectable portion
    GateLatch-->>GateLatch: Portion deflects, Arm passes
    Gate->>Gate: Spring Closes
    GateLatch->>Gate: Re-engages for next cycle

8. Consumer Electronics: Battery Ejection Latch

Enabling Description: A miniaturized version of the mechanism is used as a battery ejection latch in a ruggedized device. A sliding ejector button ("bolt carrier") is pressed. Its forward motion engages the rigid aspect of the locking member, causing it to pivot and release the battery. When the user releases the button, a spring retracts it. During retraction, the button slides over the deflectable portion of the latch, which moves out of the way without re-locking the battery, ensuring a clean ejection cycle with a single press.

Mermaid Diagram:

graph TD
    A[User Presses Button] --> B[Ejector Slider Moves Forward];
    B --> C{Contacts Locking Member};
    C --> D[Member Pivots, Unlocks Battery];
    D --> E[Battery Ejected];
    F[User Releases Button] --> G[Ejector Slider Retracts];
    G --> H{Contacts Deflectable Portion};
    H --> I[Portion Deflects, Slider Passes];
    I --> J[Latch Ready for Re-insertion];

Axis 4: Integration with Emerging Tech

9. IoT-Monitored Locking Member with Predictive Maintenance

Enabling Description: The pivot pin of the deflectable portion is replaced with a smart pin containing a piezoelectric strain gauge. The main body of the locking member houses a microcontroller and a low-power LoRaWAN transmitter. Each time the deflectable portion is actuated by the bolt carrier, the strain gauge registers the impact and pivot. The microcontroller counts these actuations as "cycles." This data is transmitted periodically to a central monitoring system. An AI model uses the cycle count and the force profile of the impacts to predict mechanical fatigue and schedule preventative maintenance before the component fails.

Mermaid Diagram:

flowchart TD
    A[Bolt Carrier Actuates Deflectable Portion] --> B[Piezoelectric Pin Measures Strain/Impact];
    B --> C[Microcontroller Processes Signal & Counts Cycle];
    C --> D{Cycle Count > Threshold?};
    D -- Yes --> E[Transmit Maintenance Alert via LoRaWAN];
    D -- No --> F[Store Cycle Count];
    E --> G[Cloud Platform];
    G --> H[AI Predictive Maintenance Model];
    H --> I[Maintenance Dashboard];

10. Blockchain-Verified Component Lifecycle Tracking

Enabling Description: The locking member is serialized with a physically unclonable function (PUF) or a QR code etched at the time of manufacture. Its material composition, manufacturing date, and initial QC tests are recorded as the genesis block on a private blockchain. Each significant event in its lifecycle—installation into a trigger assembly (recorded by the manufacturer), transfer to a distributor, and cycle counts from an integrated IoT sensor—is recorded as a new, immutable transaction on the blockchain. This provides a cryptographically secure audit trail, preventing counterfeiting and verifying the component's history and use intensity for warranty and safety analysis.

Mermaid Diagram:

erDiagram
    COMPONENT ||--o{ LIFECYCLE_EVENT : has
    COMPONENT {
        string serial_PUF pk
        string material_spec
        date mfg_date
    }
    LIFECYCLE_EVENT {
        string transaction_hash pk
        string event_type
        datetime timestamp
        int cycle_count_data
    }

Axis 5: The "Inverse" or Failure Mode

11. Fail-Safe Locking Member with Shear Pin

Enabling Description: The deflectable portion is attached to the main body not with a permanent pivot pin, but with a calibrated shear pin made from a softer material (e.g., brass or a specific polymer). Under normal operation, the pin serves as a standard pivot. However, if the bolt carrier moves with excessive force or becomes jammed against the deflectable portion (a failure condition), the shear pin is designed to fracture. Upon fracturing, the deflectable portion either falls away or swings freely, preventing the transfer of catastrophic force to the main locking member or trigger housing. This prioritizes the integrity of the larger assembly by sacrificing a small, easily replaceable component.

Mermaid Diagram:

stateDiagram-v2
    state "Normal Operation" as Normal {
        [*] --> Pivoting
        Pivoting: Shear pin intact
    }
    state "Failure Condition" as Failure {
        Jamming: Excessive force on deflectable portion
        Sheared: Pin fractures
        Safe: Deflectable portion disengages
    }
    Normal --> Failure: Bolt Carrier Jam
    Failure --> [*]: Component is inert

Combination Prior Art Scenarios

1. Combination with IEEE 802.15.4 for Wireless Mesh Network Monitoring

Disclosure: The locking member, equipped with an integrated cycle counter and strain sensor as described in derivative #9, uses an IEEE 802.15.4-compliant radio transceiver instead of LoRaWAN. This allows multiple locking members within a facility (e.g., an armory or manufacturing plant) to form a low-power, self-healing mesh network. Data regarding cycle count, operational stress, and device status is relayed from one unit to another until it reaches a central gateway. This is more robust than a star network topology in environments with significant RF interference.

2. Combination with an Open-Source RISC-V Microcontroller Core

Disclosure: The onboard microcontroller for processing sensor data and managing wireless communication (as in derivative #9) is based on an open-source RISC-V instruction set architecture (ISA). Specifically, a low-power core like the PULPino or VexRiscv is used. This decouples the smart-component's functionality from proprietary silicon, allowing for greater customization, security auditing, and a more resilient supply chain for the electronic components of the safety-critical device.

3. Combination with STEP (ISO 10303) for Digital Twin Modeling

Disclosure: The CAD model of the locking member and its deflectable portion is exported using the ISO 10303 standard (STEP protocol, specifically AP242 for managed model-based 3D engineering). This open-standard file is used as the basis for a "digital twin" of the physical component. Real-time data on cycle count and material stress, gathered via IoT sensors, is fed into a physics-based simulation model derived from the STEP file. This allows for a continuously updated digital twin that accurately reflects the physical state and remaining service life of the component, enabling advanced fleet management and predictive failure analysis based on an open data standard.