Pivoting Wing Opening Device Cam Mechanism Pin Stress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing devices for opening and closing outwardly-opening pivoting wings, such as insect screens, require high torque to compress seals, leading to stress and fatigue risk for control and pivot pins.
Innovation Solution
A device with a control assembly and locking assembly that includes a slide with a drive pin and a pivoting arm, utilizing a transmission mechanism and auxiliary closing mechanism to distribute the closing force, reducing stress on control and pivot pins by providing additional torque through an inclined plane and cam system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple slide and arm mechanism is used for opening and closing the wing, then the device complexity is reduced, but the control pin and pivot pin are subjected to high stress and high risk of fatigue failure
Solution Approach 1:
The patent introduces an intermediary cam mechanism between the slide and the arm. The cam profile is specifically designed to distribute the closing force over a longer period and reduce peak loads on the control pin and pivot pin. This intermediary element transforms the direct high-stress connection into a controlled force distribution system, maintaining reliability while preserving device simplicity.
Solution Approach 2:
The patent changes the temporal parameter of force application by using a cam profile that extends the closing action over a longer angle and time period. This parameter change reduces the instantaneous force magnitude on the pins, thereby reducing stress and fatigue risk without adding complex active control systems.
2Object-affected harmful factors
If high torque is applied to compress the seals during closing, then the sealing effectiveness is improved, but the control pin and pivot pin are subjected to high stress
Solution Approach 1:
The cam mechanism serves as an intermediary that decouples the seal compression function from direct high-stress transmission to the pins. The cam profile is designed to provide the necessary closing torque for effective seal compression while distributing this torque in a way that minimizes peak stresses on the control pin and pivot pin through geometric force distribution.
Solution Approach 2:
The patent employs a dynamic cam profile that varies the torque transmission characteristics throughout the closing motion. The cam geometry is optimized to provide higher torque when seal compression is needed while simultaneously managing the force transmission path to reduce pin stress, creating a dynamic balance between sealing effectiveness and component stress.
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 efficient opening and closing of the wing without excessive stress on the control and pivot pins, effectively compressing seals between the wing and frame, thereby reducing the risk of fatigue failure.
Implementation Method 1
the slide has a control pin, which engages a cam formed in the arm
Implementation Method 2
utilizing a transmission mechanism and auxiliary closing mechanism to distribute the closing force, reducing stress on control and pivot pins by providing additional torque through an inclined plane and cam system
Implementation Method 3
providing additional torque through an inclined plane and cam system
Data Source
AI summary
A device for opening and closing a pivoting wing, comprising: a stationary support intended to be attached to a fixed frame, a slide movable relative to the stationary support along a rectilinear direction between an open wing position and a closed and locked wing position, a pivoting arm articulated to the stationary support about an articulation axis, and having a distal end intended to be connected to the wing, a transmission mechanism associated with the slide and the arm, comprising an essentially L-shaped cam engaged by a control pin, the transmission mechanism being configured to transform the rectilinear movement of the slide along said rectilinear direction into a pivoting movement of the arm about said pivot axis.