Metal Pin Linking Structure for Lever Mountability
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Solution Overview
Problem
The existing structure for connecting a metal lever and a metal link, as disclosed in WO 2011/118356 A1, is prone to easy disengagement during assembly, necessitating an improvement in mountability.
Innovation Solution
A structure featuring a metal lever with a circular connecting hole and a metal pin comprising a support shaft, head, and connecting shaft, where the support shaft is pivotable and movable in the axial direction, and the head and connecting shaft portions have specific diameters and shapes to securely engage the metal link, with allowable portions on the pin and chamfered portions on the lever to enhance stability and swing capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a connecting leg portion is inserted and engaged into a noncircular connecting hole portion to connect metal lever and metal link, then the structure is simple and can be manufactured at low cost, but the connecting leg portion comes off easily during assembly
Solution Approach 1:
A metal pin is introduced as an intermediary component between the metal lever and metal link. The metal pin includes a support shaft portion that is insertable through the connecting hole, a head portion that prevents the lever from coming off, and a connecting shaft portion that connects to the link. This intermediary structure ensures reliable connection while maintaining manufacturing simplicity.
Solution Approach 2:
The connection structure is divided into separate functional segments: the metal pin with its head portion and connecting shaft portion, the connecting hole in the metal lever, and the coupling hole in the metal link. This segmentation allows each component to perform its specific function optimally while enabling easy assembly and disassembly.
2Adaptability or versatility
If the support shaft portion is made pivotable and movable in axial direction, then swing capability is enhanced, but radial clearance may increase causing instability
Solution Approach 1:
The metal pin's support shaft portion is designed with specific dimensional parameters including a head portion with diameter larger than the support shaft, and an allowable portion with curved surface shape. These parameter changes enable the pin to swing by a preset amount while maintaining stable connection through the head portion's engagement with the connecting hole.
Solution Approach 2:
The allowable portion of the support shaft portion is formed with a curved surface shape, which facilitates smooth swing movement and rotation. This curvature allows the pin to pivot effectively while the head portion maintains stable engagement, resolving the contradiction between swing capability and connection stability.
Data Source
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AI summary
In a connecting structure (20), a metal lever (21) and a metal link (22) are connected to each other via a metal pin (connecting pin) (23). The metal lever (21) has a circular connecting hole (21a). The metal pin (23) includes a support shaft portion (23a) insertable through the connecting hole (21a), pivotable and movable in an axial direction of the metal pin by a preset amount with respect to the connecting hole (21 a), a head portion (23b) formed at one end portion of the support shaft portion (23a), and a connecting shaft portion (23c) formed at the other end portion of the support shaft portion (23a). The metal link (22) has a coupling hole (22a) fitted to the connecting shaft portion (23c), and is integrally connected to the metal pin (23). An allowable portion (spherical curved surface (23a1)) is formed on at least one axial end portion of the support shaft portion (23a) of the metal pin (23), and is configured to increase an amount of swing of the metal lever (21) on the metal pin (23) in the axial direction of the metal pin. Thus in the structure for connecting the metal lever (outside open lever (21)) and the metal link (open link (22)) to each other, improvement in mountability can be achieved.