C-Type Pliers Tool-Free Shaft Replacement Mechanism
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Solution Overview
Problem
Conventional C-type pliers require the use of tools, such as screwdrivers, for replacing working shafts, making the process cumbersome and inefficient.
Innovation Solution
The design incorporates positioning members with pegs that have arcuate fixing and flat releasing sections, allowing working shafts to be easily inserted and removed without tools, utilizing recessed necks and anti-slip ribs for secure retention and easy replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are used to lock the clamp heads and clamping portions, then the connection is secure and reliable, but the replacement process becomes troublesome and requires tools
Solution Approach 1:
The positioning member is segmented into distinct functional sections: an arcuate fixing section for secure retention and a flat releasing section for tool-free removal. This segmentation allows the same component to provide both strong locking capability and easy release by simply rotating the peg between these sections.
Solution Approach 2:
The peg transitions from a static screw connection to a dynamic rotating mechanism. By rotating the peg, users can switch between the arcuate fixing section (for secure connection) and the flat releasing section (for easy removal), making the connection state changeable without requiring tools.
2Device complexity
If a simple peg structure is used for positioning, then the device complexity is reduced, but the retention security of the working shaft may be compromised
Solution Approach 1:
Different sections of the peg have different geometric qualities tailored to specific functions: the arcuate fixing section provides a curved surface for secure engagement with the working shaft, while the flat releasing section provides a flat surface for tool-free removal. This local differentiation of geometric properties enables both security and ease of operation in a simple structure.
Data Source
AI summary
A C-type pliers contains a body, two positioning members, and two working shafts. The body is comprises of two clamping handles pivoted together so as to form a pressing end and a working end, the two clamping handles have the two working shafts, and each clamping handle has a hole communicating with an orifice of the clamping handle. Each working shaft includes a recessed neck, and each positioning member includes a peg pivoted in the hole, and the peg has an arcuate fixing section driven by the peg which is rotated so as to insert into the orifice and to retain with the recessed neck of the each working shaft. The peg has a flat releasing section, such that when the peg is rotated so that the flat releasing section faces to the recessed neck of the each working shaft, the each working shaft is released from the peg.