Movable Cam Locking With Textile Cable Friction Fixation
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Solution Overview
Problem
Existing cam blocking devices face challenges in controlling the mechanical link between the trigger and the mobile cam, making it difficult to replace and maintain effectively.
Innovation Solution
The cam blocking device features a head with mobile cams that pivot between retracted and extended positions, a spring to maintain the extended position, and a textile wired element that passes through multiple holes and grooves on the cam to create friction, ensuring secure fixation and easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a steel cable is used to connect the trigger and cam, then the mechanical connection is strong, but the cable deteriorates quickly and breaks due to its small section
Solution Approach 1:
The patent changes the material parameter from metal cable to textile cable, and changes the connection method parameter from crimping/riveting to friction-based fixation through holes and grooves. This resolves the contradiction by providing both strength and durability through the textile material's resistance to deterioration while maintaining mechanical connection integrity.
Solution Approach 2:
The patent replaces the traditional mechanical fastening system (crimping or riveting) with a friction-based mechanical system where the cable passes through holes and is retained by grooves. This substitution eliminates the need for additional fastening components and reduces stress concentration points that lead to cable failure.
2Volume of moving object
If the cable section is decreased to reduce size, then the device becomes more compact, but the cable deteriorates quickly and is difficult to fix
Solution Approach 1:
The patent introduces grooves as intermediary structures that facilitate cable fixation. These grooves act as mediators between the cable and the cam body, providing retention without requiring complex fastening operations. The grooves enable easy manufacturing and assembly while maintaining secure cable attachment.
3Reliability
If crimping or riveting is used to fix the cable, then the connection is secure, but the fixing process is complex and time-consuming
Solution Approach 1:
The patent extracts the complex fastening operation (crimping or riveting) from the assembly process and replaces it with a simple insertion and friction-based retention system. The cable is simply passed through holes and retained by grooves, eliminating the need for additional tools, materials, and time-consuming operations while maintaining secure connection.
4Device complexity
If variability in wire element length is not compensated, then the manufacturing process is simpler, but the cam locking device behavior varies and requires compensation springs
Solution Approach 1:
The friction-based fixation system through holes and grooves allows the assembly process itself to compensate for length variations. The friction and flexibility of the textile cable enable automatic adjustment to achieve consistent device behavior without requiring additional compensation springs or complex manufacturing controls.
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
This design provides better control over the mechanical link between the trigger and the cam, simplifies the replacement process, and enhances the durability and reliability of the cam blocking device.
Implementation Method 1
The textile wire member passes through the first hole and the second hole to introduce friction between the textile wire member and the at least one cam
Implementation Method 2
a spring operatively coupled to the at least one cam to bias the at least one cam toward the extended position
Data Source
Figure 1~4
Figure 5a~6c
Figure 7~10
AI summary
A cam-operated locking device comprises a head (1), a cam (3), and a spring (9) that forces the cam (3) into an extended position. A textile wire element (8) connects the cam (3) to a trigger (7) movably mounted between first and second positions. The cam (3) defines a first hole (3a) and a second hole (3b). The textile wire element (8) passes through the first hole (3a) and the second hole (3b) to introduce friction between the textile wire element (8) and the cam (3). A terminal portion of the textile wire element (8) passes through a third hole (3c) connecting the sides of the cam and/or is wedged into a groove (3d) formed in one of the sides. The terminal portion of the textile wire element (8) is positioned posterior to the second hole (3b) along a longitudinal direction of the textile wire element (8) from the trigger (7).