Rotary Fastener Guide Track and Position-Limit Structure
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Solution Overview
Problem
Existing rotary fasteners are difficult to use due to hidden position-limit member configurations, making operation challenging, and the compression spring resistance causes instability, leading to accidental pin movement and tool dependency for assembly and disassembly.
Innovation Solution
A rotary fastener design featuring a stepped accommodation chamber with a position-limit structure, a pin member with an expanded bottom engagement portion, and an operating device with a guide track, high-position and low-position locating notches, and sloping guide paths to facilitate easy locking and unlocking with enhanced user control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the position-limit member is fixedly mounted in the mounting base member, then the structure is compact, but the user cannot easily view the relative positions between the locking pin and position-limit member, making operation difficult
Solution Approach 1:
The position-limit member is divided into a fixed portion (mounting base member) and a movable portion (operating cap member). This segmentation allows the movable portion to be rotated independently, enabling the user to view different relative positions between the locking pin and position-limit member, thus improving operability while maintaining structural compactness.
Solution Approach 2:
The position-limit member transitions from a completely fixed state to a partially movable state. The operating cap member can be rotated relative to the mounting base member, allowing dynamic adjustment of the visible position between the locking pin and position-limit member, making operation easier while keeping the overall structure compact.
2Reliability
If the compression spring pushes the locking pin, then the locking mechanism is reliable, but the resistance causes the user unable to keep the locking pin in balance, leading to accidental pin movement
Solution Approach 1:
The operating cap member is designed to rotate dynamically, allowing the user to manually control the position of the locking pin against the compression spring force. By rotating the operating cap member, the user can precisely position the locking pin in balanced states, overcoming the instability caused by spring resistance while maintaining reliable locking when engaged.
Solution Approach 2:
The operating cap member acts as an intermediary between the user's manual input and the locking pin. It transmits and controls the force applied to the locking pin, allowing precise balance control while the compression spring provides reliable locking force when the pin is engaged in the locked position.
3Ease of operation
If the operating knob is pulled to lift the locking pin, then unlocking is possible, but the compression spring forces the pin outward, causing the operating knob to strike against the mounting base member
Solution Approach 1:
The operating cap member is designed with rotational freedom, allowing it to move dynamically during the unlocking process. When the user pulls the operating cap member, it rotates rather than moving linearly outward, preventing the operating cap member from striking against the mounting base member while still enabling the locking pin to be lifted for unlocking.
Solution Approach 2:
The operating cap member incorporates curved or rotational movement paths instead of linear motion. This curved trajectory allows the operating cap member to clear the mounting base member during the unlocking stroke, eliminating the harmful strike while maintaining the unlocking function.
4Manufacturing precision
If specialized tools are used for mounting and dismounting screws, then precise assembly is achieved, but the work is interrupted if tools are not available
Solution Approach 1:
The rotary fastener is designed to be self-servicing, allowing users to mount and dismount it using only manual rotation of the operating cap member without requiring specialized tools. The integrated design of the locking mechanism and operating interface enables precise assembly and disassembly through simple rotational operations, maintaining manufacturing precision while ensuring work continuity even when tools are unavailable.
Data Source
AI summary
A rotary fastener includes a mounting base member, a fastening device including a pin member suspending in the mounting base member and a head member fastened to the pin member and disposed outside the mounting base member, and an operating device including a bottom seat member fastened to the mounting base member, an operating cap member fastened to the head member and rotatable relative to the bottom seat member to move the fastening device between a locking position where the pin member is extended out of the bottom side of the mounting base member and an unlocking position where the pin member is received inside the mounting base member, and a guide track for guiding the operating cap member and the fastening device to move axially relative to the bottom seat member and the mounting base member upon rotation of the operating cap member by an external force.