Outboard Cowl Service Door Hinge for One-Push Controlled Opening
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Solution Overview
Problem
Conventional service doors on outboard marine propulsion devices require a separate motion to open after unlatching, making it difficult for operators to visually confirm latching status and necessitating a two-step process for opening, which is inefficient.
Innovation Solution
A service door design incorporating a biasing device and a damper that allows for automatic opening with a single push, utilizing a first hinge to bias the door towards the open position and a second hinge to control the opening rate, ensuring accessibility when open and security when closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional service door design is used, then the door can be securely latched, but it requires a separate motion to open after unlatching, making it difficult for operators to visually confirm latching status and necessitating a two-step process for opening
Solution Approach 1:
The patent combines the unlatching and opening actions into a single motion by integrating the latch release mechanism with the door hinge system. When the door is pushed, the hinge automatically triggers the latch to release, merging two previously separate operations (unlatching + opening) into one seamless action, thereby improving ease of operation without proportionally increasing complexity
Solution Approach 2:
The hinge is designed to automatically trigger the latch release mechanism before the door fully opens. This preliminary action of unlatching occurs as part of the opening motion itself, eliminating the need for a separate unlatching step and allowing operators to confirm latching status visually as the door begins to move
2Productivity
If a biasing device is added to automatically open the door, then operational efficiency is improved, but the device complexity increases
Solution Approach 1:
The door system uses a biasing device (spring) that automatically pushes the door open after unlatching, making the system self-actuating. The spring stores energy during door closure and automatically releases it to open the door without requiring additional manual input, thereby improving productivity while keeping the actuator assembly relatively simple
Solution Approach 2:
The biasing device creates a periodic action where the door automatically opens after being closed and latched. The spring-loaded mechanism provides a rhythmic, self-repeating open-close cycle that improves operational efficiency by eliminating manual opening actions while maintaining a straightforward mechanical design
3Stability of the object's composition
If a damper is added to control the opening rate, then rebound bounce is reduced, but the device complexity increases
Solution Approach 1:
The damper is integrated into the hinge mechanism to provide beforehand cushioning that resists rapid door opening. This cushioning effect occurs as the door begins to move, preventing rebound bounce before it can occur by controlling the opening rate from the start of the motion, thereby improving stability while adding minimal complexity to the hinge mechanism
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables automatic and controlled opening of the service door with a single motion, improving operational efficiency and reducing the risk of rebound bounce, while maintaining secure closure.
Implementation Method 1
A coil spring is positioned between the door panel and the cowl and operates in conjunction with the first hinge to bias the door panel towards the open position. The coil spring has a fixed end and a rotating end that is opposite the fixed end. The rotating end is configured to impart a spring force on the door panel
Implementation Method 2
A damper is positioned between the door panel and the cowl and operates in conjunction with the second hinge to resists rotation of the door panel towards the open position
Data Source
AI summary
A service door for a cowl for a marine propulsion device. A door panel is positionable in open and closed positions. A first hinge rotatably couples the door panel to the cowl. A coil spring biases the door panel towards the open position and a damper resists rotation of the door panel towards the open position. The first hinge rotates about a first axis and has a first hinge base, a first hinge axle, and a first hinge axle opening that receives the first hinge axle. The first hinge axle has base and distal ends. The base end is coupled to the first hinge base and the distal end has a spring slot. The coil spring has fixed and rotating ends. The rotating end imparts a spring force on the door panel with the fixed end in the spring slot.