Derivative works — US Patent 8104492

Here is a comprehensive "Defensive Disclosure" document for US patent 8104492, focused on generating prior art to render future incremental improvements obvious or non-novel. The analysis is based on Claim 1 of the patent.

Defensive Disclosure for US8104492 - Adjustable Offset Umbrella

Inventor: Wu Wei Dan
Current Assignee: ATLEISURE LLC
Publication Date: January 31, 2012
Anticipated Expiration Date: May 5, 2029
Current Date: April 26, 2026

The following derivative variations are disclosed to expand the prior art landscape related to adjustable offset umbrellas, specifically addressing potential incremental improvements by competitors. These disclosures aim to cover various materials, operational parameters, application domains, technological integrations, and failure modes, rendering such future developments obvious to a person skilled in the art.

Core Claim 1 Summary (for context of derivatives):

An umbrella comprising: a main pole; a sliding member selectably moveable on the main pole with locking means; an umbrella canopy; an arm extending from the canopy to the sliding member; a brace pivotably attached to an upper pole portion and the arm; a winding mechanism with a winder hub mounted to the sliding member; and a line from the winder hub along the arm to the canopy. The winding mechanism opens/closes the canopy, and sliding member movement adjusts the canopy angle.

Derivative Variations

1. Material & Component Substitution

Derivative 1.1: High-Performance Composite & Electro-Magnetic Locking

Enabling Description: The main pole, arm, and brace components are fabricated from pultruded or filament-wound carbon fiber reinforced polymer (CFRP) composites (e.g., using T700 grade carbon fiber with epoxy resin matrix) for increased strength-to-weight ratio and corrosion resistance. The sliding member is constructed from a high-strength, low-friction engineering thermoplastic, such as polyetherimide (PEI, e.g., Ultem 1000). The locking means comprises an electromagnetically actuated detent pin mechanism. A series of ferrous inserts are embedded at intervals along the main pole. The sliding member integrates an electromagnet that, when energized, retracts a spring-biased hardened steel detent pin, allowing free movement. De-energizing the electromagnet releases the detent pin to engage the nearest ferrous insert, securing the sliding member. The winding mechanism utilizes a miniature, high-torque brushless DC servo motor with an integrated planetary gear reduction unit, directly driving the winder hub, and a Dyneema® fiber line for superior tensile strength and abrasion resistance.

Mermaid Diagram:

graph TD
    A[Main Pole (CFRP)] --> B{Sliding Member (PEI)}
    B -- Electromagnetically Actuated --> C[Locking Mechanism (Detent Pin & Ferrous Inserts)]
    B --> D[Arm (CFRP)]
    D --> E[Umbrella Canopy]
    F[Brace (CFRP)] -- Pivotally Attached --> A
    F -- Pivotally Attached --> D
    B --> G[Winding Mechanism (Brushless DC Servo Motor)]
    G -- Drives --> H[Winder Hub]
    H -- Winds --> I[Dyneema Line]
    I --> E

Derivative 1.2: Aluminum Alloy Structure with Pneumatic Locking

Enabling Description: The main pole, arm, and brace are constructed from aerospace-grade aluminum alloy 7075-T6 extruded sections, offering excellent strength and fatigue resistance while maintaining a lighter weight than steel. The sliding member is machined from Aluminum 6061-T6. The locking means employs a pneumatic clamping cylinder integrated within the sliding member, which, upon activation, extends opposing jaws lined with high-friction elastomeric pads (e.g., EPDM rubber) to create a friction lock against the main pole. A small, rechargeable compressed air cartridge and a micro-solenoid valve control the pneumatic cylinder. The winding mechanism features a lead screw linear actuator coupled to a Geneva drive mechanism for precise and discrete rotation of the winder hub, utilizing a stainless steel braided cable (e.g., 316L grade) as the line for robustness in varied outdoor conditions.

Mermaid Diagram:

graph TD
    A[Main Pole (Alloy 7075-T6)] --> B{Sliding Member (Alloy 6061-T6)}
    B -- Pneumatic Clamping Cylinder --> C[Locking Mechanism (Elastomeric Pads)]
    B --> D[Arm (Alloy 7075-T6)]
    D --> E[Umbrella Canopy]
    F[Brace (Alloy 7075-T6)] -- Pivotally Attached --> A
    F -- Pivotally Attached --> D
    B --> G[Winding Mechanism (Lead Screw Linear Actuator)]
    G -- Coupled to --> H[Geneva Drive]
    H -- Drives --> I[Winder Hub]
    I -- Winds --> J[Stainless Steel Braided Cable]
    J --> E

Derivative 1.3: Recycled Polymer Structure with Shape Memory Alloy Actuation

Enabling Description: The main pole, arm, and brace are fabricated from injection-molded, fiber-reinforced recycled polyolefin composites (e.g., HDPE with glass fiber reinforcement) for sustainability and cost-effectiveness. The sliding member is also molded from recycled ABS. The locking means incorporates a series of shape memory alloy (SMA) (e.g., NiTi alloy) wire actuators. When an electrical current is applied, the SMA wires heat up, contract, and pull a wedge-shaped locking element into a corresponding recess on the main pole, securing the sliding member. Cooling the wires releases the lock. The winding mechanism employs a magnetic gear drive system, providing high torque density and no mechanical contact wear, and uses a multi-filament nylon line (e.g., braided parachute cord) known for its knot retention and impact absorption.

Mermaid Diagram:

graph TD
    A[Main Pole (Recycled Polyolefin Composite)] --> B{Sliding Member (Recycled ABS)}
    B -- SMA Wire Actuators --> C[Locking Mechanism (Wedge Element)]
    B --> D[Arm (Recycled Polyolefin Composite)]
    D --> E[Umbrella Canopy]
    F[Brace (Recycled Polyolefin Composite)] -- Pivotally Attached --> A
    F -- Pivotally Attached --> D
    B --> G[Winding Mechanism (Magnetic Gear Drive)]
    G -- Drives --> H[Winder Hub]
    H -- Winds --> I[Multi-filament Nylon Line]
    I --> E

2. Operational Parameter Expansion

Derivative 2.1: Large-Scale Industrial Sunshade with High Wind Load Resistance

Enabling Description: This derivative scales the umbrella to an industrial sunshade, with a main pole exceeding 15 meters in height and a canopy spanning 50-100 meters in diameter, designed for outdoor event venues or industrial material storage. The main pole is a multi-section lattice truss structure of high-strength structural steel (e.g., ASTM A514). The sliding member is a heavy-duty, roller-guided carriage system incorporating hydraulically actuated multi-jaw friction clamps for locking, capable of withstanding extreme shear and axial forces. The canopy is constructed from reinforced architectural PVC membrane (e.g., Serge Ferrari Précontraint 1202). The arm and brace are similarly scaled lattice structures. The winding mechanism consists of a robust hydraulic winch system, powered by an electro-hydraulic power unit, spooling a high-tensile galvanized steel wire rope (e.g., 6x36 WS IWRC) with a breaking strength of 500 kN, to deploy and retract the massive canopy against significant aerodynamic loads. The system is designed to operate in wind speeds up to 120 km/h with an emergency automatic retraction sequence.

Mermaid Diagram:

graph TD
    A[Main Pole (Steel Lattice Truss)] --> B{Sliding Member (Hydraulic Roller Carriage)}
    B -- Hydraulically Actuated --> C[Locking Mechanism (Multi-Jaw Friction Clamps)]
    B --> D[Arm (Steel Lattice Truss)]
    D --> E[Canopy (Reinforced PVC Membrane)]
    F[Brace (Steel Lattice Truss)] -- Pivotally Attached --> A
    F -- Pivotally Attached --> D
    B --> G[Winding Mechanism (Hydraulic Winch)]
    G -- Spools --> H[Galvanized Steel Wire Rope]
    H --> E
    A -- Supported by --> I[Heavy-Duty Base]
    G -- Powered by --> J[Electro-Hydraulic Power Unit]

Derivative 2.2: Miniaturized, High-Frequency Deployable Drone-Mounted Shade

Enabling Description: This variation describes a miniaturized umbrella for drone deployment, weighing less than 500g, with a main pole length of 30 cm and a canopy diameter of 60 cm, providing localized shade for sensors or small wildlife. The main pole is a telescopic assembly of ultra-lightweight carbon fiber tubes. The sliding member is a micro-servo driven linear actuator with a spring-loaded ball detent lock, enabling rapid height adjustment. The canopy is made of lightweight, UV-reflective ripstop nylon. The arm and brace are thin-walled titanium alloy rods. The winding mechanism uses a high-speed coreless DC motor with a micro-gearbox, rapidly winding and unwinding a braided aramid fiber thread (e.g., Kevlar® 29) for deployment/retraction within 1-2 seconds, allowing high-frequency, on-demand shading responsive to sensor inputs (e.g., real-time solar intensity changes).

Mermaid Diagram:

graph TD
    A[Main Pole (Telescopic Carbon Fiber)] --> B{Sliding Member (Micro-Servo Linear Actuator)}
    B -- Spring-Loaded --> C[Locking Mechanism (Ball Detent)]
    B --> D[Arm (Titanium Alloy Rods)]
    D --> E[Canopy (Ripstop Nylon)]
    F[Brace (Titanium Alloy Rods)] -- Pivotally Attached --> A
    F -- Pivotally Attached --> D
    B --> G[Winding Mechanism (High-Speed Coreless DC Motor)]
    G -- Winds --> H[Braided Aramid Fiber Thread]
    H --> E
    I[Drone Platform] -- Mounts --> A

3. Cross-Domain Application

Derivative 3.1: Aerospace - Deployable Solar Array Shield for Satellites

Enabling Description: The adjustable offset umbrella mechanism is repurposed as a deployable sunshield for satellite solar panel arrays. The "main pole" is a structural boom extending from the satellite bus. The "sliding member" is a linear translation stage on the boom. The "locking means" are micro-latching mechanisms. The "umbrella canopy" is a multi-layered Kapton or Mylar thermal blanket, acting as a solar shield to regulate solar array temperature or protect against space debris. The "arm" connects the shield to the translation stage, and the "brace" links to an upper portion of the boom. The "winding mechanism" is a stepper motor-driven spool, and the "line" is a high-strength Vectran® tether, precisely deploying and retracting the solar shield. Adjusting the "sliding member" along the boom changes the shield's angle to precisely control solar exposure or protect specific array sections, crucial for mission-specific power management and thermal control in LEO or GEO environments.

Mermaid Diagram:

graph TD
    A[Satellite Bus] --> B[Structural Boom (Main Pole)]
    B --> C{Linear Translation Stage (Sliding Member)}
    C -- Micro-Latching --> D[Locking Mechanisms]
    C --> E[Shield Support Arm]
    E --> F[Multi-Layer Kapton/Mylar Solar Shield (Canopy)]
    G[Brace] -- Pivotally Attached --> B
    G -- Pivotally Attached --> E
    C --> H[Stepper Motor Spool (Winding Mechanism)]
    H -- Winds --> I[Vectran Tether (Line)]
    I --> F
    F -- Protects --> J[Solar Panel Array]

Derivative 3.2: AgTech - Automated Field-Mobile Crop Shade

Enabling Description: This system is adapted for precision agriculture as an automated, field-mobile shade for high-value crops (e.g., berries, specialty vegetables) or heat-stressed livestock. The "main pole" is a vertical mast mounted on a robotic mobile platform (e.g., an autonomous ground vehicle, AGV). The "sliding member" is an electrically actuated linear slide. The "locking means" is an electromechanical brake. The "umbrella canopy" is a permeable shade cloth with specific UV-blocking properties. The "arm" extends from the shade cloth to the linear slide, and the "brace" connects to the upper mast. The "winding mechanism" is a weather-sealed DC motor with a gear reduction unit, and the "line" is a UV-stabilized polymer cord. The AGV navigates crop rows, and the system autonomously adjusts the shade's height and angle based on real-time solar radiation sensors, crop-specific algorithms, and GPS coordinates to optimize photosynthesis and prevent sunscald, even in undulating terrain.

Mermaid Diagram:

graph TD
    A[Autonomous Ground Vehicle (AGV)] --> B[Vertical Mast (Main Pole)]
    B --> C{Electrically Actuated Linear Slide (Sliding Member)}
    C -- Electromechanical --> D[Brake (Locking Means)]
    C --> E[Shade Support Arm]
    E --> F[Permeable UV-Blocking Shade Cloth (Canopy)]
    G[Brace] -- Pivotally Attached --> B
    G -- Pivotally Attached --> E
    C --> H[Weather-Sealed DC Motor (Winding Mechanism)]
    H -- Winds --> I[UV-Stabilized Polymer Cord (Line)]
    I --> F
    J[GPS Module] --> A
    K[Solar Radiation Sensor] --> C
    L[Crop Algorithm Unit] --> C
    C -- Controls --> B, E, F

Derivative 3.3: Consumer Electronics - Retractable Outdoor Kiosk Display Shield

Enabling Description: The mechanism is integrated into outdoor digital kiosks or ATM machines to provide a retractable glare shield for the display screen. The "main pole" is a structural upright of the kiosk. The "sliding member" is a compact linear rail guide assembly, flush-mounted within the kiosk housing. The "locking means" is a miniature solenoid-actuated pin. The "umbrella canopy" is a rigid, opaque or tinted polycarbonate panel, providing glare reduction and vandalism deterrence. The "arm" is a telescopic support linking the panel to the linear guide. The "brace" is a compact linkage system. The "winding mechanism" is a silent, high-precision stepper motor driving a small capstan, and the "line" is a thin, high-strength synthetic filament (e.g., Spectra®) that controls the panel's deployment and retraction. The system is activated by ambient light sensors or user input, automatically positioning the shield for optimal screen visibility.

Mermaid Diagram:

graph TD
    A[Kiosk/ATM Housing] --> B[Structural Upright (Main Pole)]
    B --> C{Linear Rail Guide Assembly (Sliding Member)}
    C -- Solenoid-Actuated --> D[Pin (Locking Means)]
    C --> E[Telescopic Support Arm]
    E --> F[Rigid Polycarbonate Shield (Canopy)]
    G[Compact Linkage Brace] -- Pivotally Attached --> B
    G -- Pivotally Attached --> E
    C --> H[Stepper Motor & Capstan (Winding Mechanism)]
    H -- Winds --> I[Synthetic Filament (Line)]
    I --> F
    J[Ambient Light Sensor] --> C
    K[User Input Interface] --> C
    C -- Controls --> F

4. Integration with Emerging Tech

Derivative 4.1: AI-Optimized, IoT-Enabled Smart Umbrella with Energy Harvesting

Enabling Description: The umbrella integrates an array of IoT sensors (UV index, wind speed/direction, ambient temperature, humidity, rain sensor, and tilt angle accelerometer) into the canopy assembly and main pole. A low-power microcontroller (e.g., ESP32-based) processes this real-time data. An onboard AI inference engine (e.g., a pre-trained TinyML model) uses this data, combined with local weather forecasts fetched via Wi-Fi, to predict optimal canopy tilt and deployment status for maximum shade and wind resistance. Solar panels integrated into the upper surface of the canopy provide energy harvesting, charging a lithium-ion battery that powers the servo-motorized winding mechanism and electromagnetic locking system. Users interact via a smartphone application (leveraging MQTT for data exchange), which also provides predictive maintenance alerts based on motor current draw and cable wear, and allows manual override. The sliding member is actuated by a precision linear servo motor.

Mermaid Diagram:

graph TD
    A[Umbrella Canopy] -- Integrated --> B[IoT Sensor Array (UV, Wind, Temp, Humidity, Rain, Accelerometer)]
    A -- Integrated --> C[Solar Panels]
    C -- Charges --> D[Li-Ion Battery]
    D -- Powers --> E[Microcontroller (ESP32) + AI Inference Engine]
    E -- Controls --> F[Precision Linear Servo Motor (Sliding Member Actuator)]
    F -- Actuates --> G[Sliding Member]
    G -- Controls --> H[Electromagnetic Locking System]
    E -- Controls --> I[Servo-Motorized Winding Mechanism]
    I -- Actuates --> J[Canopy Open/Close]
    B -- Feeds Data --> E
    K[Local Weather Forecast (via Wi-Fi)] --> E
    E -- Communicates via MQTT --> L[Smartphone App]
    L -- Provides --> M[Predictive Maintenance Alerts]
    L -- Allows --> N[Manual Override]

Derivative 4.2: Blockchain-Enabled Supply Chain & Usage Verification Umbrella

Enabling Description: This derivative focuses on integrating blockchain technology for enhanced supply chain transparency and verifiable usage logging for commercial or shared-economy umbrella systems. Each major component (main pole, sliding member, arm, winding mechanism) is equipped with a unique serialized RFID tag or NFC chip, recorded on a private blockchain (e.g., Hyperledger Fabric) at each stage of manufacturing and assembly. The umbrella's main controller (e.g., a secure embedded microcontroller) includes a cryptographic module. When the umbrella is rented or activated (e.g., in a public park), its operational parameters (deployment/retraction cycles, tilt adjustments, operational hours) are timestamped and cryptographically signed as transactions on the blockchain. This provides an immutable record for warranty claims, maintenance scheduling, and usage-based billing in a shared-economy model. The locking means and winding mechanism are robust, tamper-resistant electromechanical units.

Mermaid Diagram:

graph TD
    A[Component 1 (Main Pole)] -- RFID/NFC --> B[Blockchain Record]
    C[Component 2 (Sliding Member)] -- RFID/NFC --> B
    D[Component N (Winding Mech.)] -- RFID/NFC --> B
    E[Manufacturing Stage] -- Logged on --> B
    F[Assembly Stage] -- Logged on --> B
    G{Umbrella Main Controller} -- Cryptographic Module --> B
    G -- Records --> H[Operational Parameters (Usage Data)]
    H -- Timestamped & Signed --> B[Blockchain Ledger]
    I[Rental/Activation Event] -- Triggers Recording --> G
    J[Immutable Record] -- Supports --> K[Warranty Claims]
    J -- Supports --> L[Maintenance Scheduling]
    J -- Supports --> M[Usage-Based Billing]

5. The "Inverse" or Failure Mode

Derivative 5.1: Automatic Fail-Safe High-Wind Retraction System

Enabling Description: The umbrella is engineered with a primary operational mode and an automatic fail-safe retraction mode to prevent structural damage in high winds. The main pole integrates a calibrated anemometer (wind speed sensor) at its upper end. The sliding member incorporates a spring-loaded quick-release latch mechanism, held under tension by a solenoid. In normal operation, the solenoid maintains the lock. When the anemometer detects wind speeds exceeding a pre-programmed critical threshold (e.g., 50 km/h) for a continuous period (e.g., 5 seconds), the system's microcontroller instantly de-energizes the solenoid. This releases the quick-release latch, allowing the sliding member to rapidly descend to its lowest position due to gravity, and simultaneously, the line from the winding mechanism is rapidly unspooled (or a separate spring-assisted retraction system for the canopy is activated). This causes the canopy to fully collapse and fold against the main pole, minimizing its wind profile and preventing inversion or structural failure. A low-power battery backup ensures the anemometer and microcontroller function during power outages.

Mermaid Diagram:

stateDiagram-v2
    [*] --> Deployed_Normal: Initial State
    Deployed_Normal --> Monitoring_Wind: Wind Sensor Active
    Monitoring_Wind --> Critical_Threshold_Exceeded: Wind > Threshold (t>5s)
    Critical_Threshold_Exceeded --> Emergency_Retraction: Solenoid De-energized
    Emergency_Retraction --> Canopy_Collapsed: Sliding Member Descends, Canopy Retracts
    Canopy_Collapsed --> Safe_Mode: Minimized Wind Profile
    Safe_Mode --> Deployed_Normal: Manual Reset / Wind < Threshold
    Deployed_Normal --> Power_Loss: System Power Off
    Power_Loss --> Emergency_Retraction: Battery Backup Activated (if wind > threshold)

Derivative 5.2: Limited-Functionality "Limp Home" Mode

Enabling Description: This umbrella includes a "limp home" or limited-functionality mode, activated upon detection of critical system failures (e.g., winding motor stall, main power loss, or lock mechanism fault). In this mode, complex automated adjustments are disabled. The primary power source (e.g., grid or main battery) is disconnected, and a smaller, auxiliary battery powers only essential sensors and a manual override interface. The locking mechanism defaults to a partially engaged friction brake to prevent uncontrolled sliding, but allows manual, high-effort adjustment of the sliding member by the user (e.g., via a secondary handle or lever that disengages the brake temporarily). The winding mechanism disables its motor and allows manual crank operation (even if the motor is faulty) for canopy opening/closing. All smart features (AI optimization, IoT communication) are suspended, providing basic, reliable mechanical operation for user convenience during system impairment.

Mermaid Diagram:

graph TD
    A[Normal Operation] --> B{Fault Detected?}
    B -- Yes --> C[Activate Limp Home Mode]
    B -- No --> A
    C --> D[Disconnect Main Power]
    C --> E[Connect Auxiliary Battery]
    C --> F[Disable Smart Features (AI, IoT)]
    C --> G[Locking Mech: Partially Engaged Friction Brake]
    G -- Allows --> H[Manual Sliding Adjust (High Effort)]
    C --> I[Winding Mech: Motor Disabled]
    I -- Allows --> J[Manual Crank Operation]
    K[Essential Sensors] -- Powered by --> E
    L[Manual Override Interface] -- Allows --> H, J

Combination Prior Art Scenarios

Combination with Open-Source Robotics Operating System (ROS):
- Description: The adjustable offset umbrella described in US8104492 is integrated into a mobile robotic platform using the Robot Operating System (ROS) framework (an open-source standard for robotics middleware). The main pole is mounted on an AGV (Autonomous Ground Vehicle) as described in Derivative 3.2. The ROS architecture is used to manage and integrate all sensors (GPS, IMU, solar radiation, wind), motor controllers for the sliding member and winding mechanism, and navigation algorithms for the AGV. ROS nodes would handle tasks such as: umbrella_control_node (for interpreting AI-optimized shade commands and sending commands to motor drivers), sensor_fusion_node (for combining data from various environmental sensors), and agv_navigation_node (for path planning and autonomous movement between crop rows). This combination leverages ROS's modularity and extensive libraries for perception, planning, and control in real-time.
- Impact: Renders obvious the use of open-source robotics platforms for controlling and automating the movement and adjustment of an offset umbrella system, particularly for mobile applications.
Combination with MQTT Protocol for IoT Integration:
- Description: The IoT-enabled smart umbrella from Derivative 4.1 communicates its sensor data and receives control commands via the Message Queuing Telemetry Transport (MQTT) protocol. MQTT is an OASIS standard messaging protocol for the Internet of Things. The umbrella's microcontroller acts as an MQTT client, publishing sensor data (e.g., UV index, wind speed, battery status) to specific topics on an MQTT broker (cloud-hosted or local). It also subscribes to command topics (e.g., "umbrella/control/tilt," "umbrella/control/open_close") to receive instructions from a smartphone application or central home automation system. This leverages MQTT's lightweight, publish-subscribe model for efficient and scalable communication, especially in environments with constrained network resources or intermittent connectivity.
- Impact: Renders obvious the use of standard IoT communication protocols like MQTT for remote monitoring, control, and data exchange with adjustable offset umbrella systems.
Combination with Open-Source 3D Printing Standards (e.g., G-code via RepRap community standards):
- Description: For prototyping, customization, and distributed manufacturing of specific components of the adjustable offset umbrella, open-source 3D printing standards are employed. For example, the sliding member's housing, various pulley brackets, or locking mechanism components (e.g., pawl, cam lever) are designed using open-source CAD software (e.g., FreeCAD, Blender) and fabricated using fused deposition modeling (FDM) 3D printers, which operate on standardized G-code instructions (developed by communities like RepRap). This allows for rapid iteration and creation of custom parts from common thermoplastics (PLA, ABS, PETG), enabling quick modifications for different pole geometries or user interfaces. The design files for these components are shared under open-source licenses.
- Impact: Renders obvious the use of open-source 3D printing technologies and associated standards for manufacturing, prototyping, or customizing parts of adjustable offset umbrella mechanisms, facilitating widespread adoption and modification.