Pneumatic Pivot Fixture Friction Locking Mechanism
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Solution Overview
Problem
Pivot fixtures for windows and doors lack a mechanism for noiseless, rapid operation and stepless position adjustment, often resulting in unintentional closure due to lack of secure locking mechanisms.
Innovation Solution
A pivot fixture with a guide unit and arresting unit featuring a control cam structure and an expansion body with a friction surface, allowing for noiseless operation and secure position adjustment by engaging the friction surface with the guide tube's inner wall upon expansion, enabling both rapid opening and closing with minimal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional pivot fixture is used, then the structure is simple, but the operation is noisy and position adjustment is not stepless
Solution Approach 1:
A friction element is introduced as an intermediary component between the engagement rod and the guide tube. This friction element enables noiseless operation by providing controlled friction engagement, while its inclusion in the mechanism increases device complexity. The friction element acts as a mediator that allows smooth, quiet positioning without direct metal-to-metal contact.
Solution Approach 2:
The invention changes the operational parameters by introducing a friction-based engagement system instead of traditional mechanical engagement. This parameter change enables noiseless operation and stepless position adjustment, though it increases the complexity of the mechanism by adding the friction element and controlling its engagement characteristics.
2Speed
If a traditional pivot fixture is used, then the structure is simple, but rapid opening and closing is not achieved
Solution Approach 1:
The friction element is designed to dynamically adjust its engagement level during operation. During rapid opening and closing, the friction engagement can be minimized or temporarily disengaged to allow quick movement, then re-engages to secure the position. This dynamic behavior enables rapid operation while maintaining security, though it increases mechanism complexity.
3Reliability
If a traditional pivot fixture is used, then the structure is simple, but secure locking is not achieved
Solution Approach 1:
The friction element serves as an intermediary locking mechanism between the engagement rod and guide tube. It provides secure locking through controlled friction engagement, preventing unintentional closure. The friction-based locking is more reliable than traditional mechanical locking while adding complexity to the overall mechanism.
4Ease of operation
If a traditional pivot fixture is used, then the structure is simple, but stepless position adjustment is not achieved
Solution Approach 1:
The friction element enables stepless position adjustment by allowing continuous variation in friction engagement levels. By controlling the friction force, the engagement rod can be positioned at any angle along the guide tube, achieving stepless adjustment. This continuous control capability increases mechanism complexity compared to traditional discrete positioning systems.
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 noiseless, rapid opening and closing of pivotable parts with secure position adjustment, preventing unintentional closure and allowing for stepless angle adjustment, thus enhancing operational efficiency and safety.
Implementation Method 1
an expansion body with a friction surface is slidably disposed on the engagement rod, the friction surface being arranged adjacent an inner wall section of the guide tube for engagement with the wall section upon expansion of the expansion body by the engagement rod
Data Source
AI summary
In a pivot fixture for pivotable parts, comprising a guide unit with a guide tube and an arrest unit with an engagement rod slidably disposed in the guide tube, the engagement rod is provided with control cam structures and an expansion body with a friction surface is slidably disposed on the engagement rod, the friction surface being arranged adjacent an inner wall section of the guide tube for engagement with the wall section upon expansion of the expansion body by the engagement rod.