Thread Fixing Mechanism for Viewfinder Anti-Loosening
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Solution Overview
Problem
Conventional thread fixing mechanisms for viewfinders in shoulder cameras are prone to loosening under vibration or impact, leading to the risk of the viewfinder accidentally falling out of its fixed position.
Innovation Solution
A thread fixing mechanism comprising a first member with a male thread, a rotary control with a female thread, a second member, a protrusion, and concave-convex portions that prevent loosening by providing a clicking sensation and resistance when tightened, ensuring the viewfinder remains securely fixed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional threaded control mechanism is used to fix the viewfinder, then the viewfinder can be securely fixed in place, but the threads can loosen under vibration or impact causing the viewfinder to fall out
Solution Approach 1:
The concave-convex portions are pre-configured on the rotary control and corresponding protrusions on the first member to engage before any loosening can occur. When the rotary control is turned to tighten the threads, the convex portions of the concave-convex structure make contact with the protrusions, creating immediate mechanical interference that prevents backward rotation and thread loosening under subsequent vibration or impact loads.
Solution Approach 2:
The concave-convex portions act as an intermediary anti-loosening mechanism between the threaded connection and the external vibration/impact forces. This intermediate mechanical feature provides a positive locking action that supplements the threaded connection, preventing the threads from loosening while maintaining the simplicity of the overall fixing structure.
2Device complexity
If the viewfinder is press-fitted by tightening the threaded part, then the viewfinder position can be fixed, but the structure is simple and provides no protection against loosening
Solution Approach 1:
The fixing mechanism is segmented into distinct functional elements: the threaded connection for primary fixation and the concave-convex portions with protrusions for anti-loosening protection. This segmentation allows each element to perform its specific function independently while working together to provide both simple operation and reliable anti-loosening capability.
Solution Approach 2:
The invention changes the mechanical parameters of the rotary control by adding concave-convex portions that create intermittent mechanical engagement with protrusions on the first member. This parameter change transforms the simple rotational movement into a controlled engagement-disengagement sequence that provides anti-loosening protection without significantly increasing the overall device complexity.
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
The mechanism effectively prevents thread loosening and viewfinder detachment due to vibration or impact, providing a secure fixing solution that eliminates the need for constant tightening checks.
Implementation Method 1
The first member has a male thread portion. The rotary control has a female thread portion that meshes with the male thread portion.
Implementation Method 2
The plurality of concave-convex portions are provided in the peripheral direction to either the second member or the rotary control, so that when the rotary control is turned, the second member and the rotary control move closer together as the first member and the rotary control are moved closer together by the male thread portion and the female thread portion, and the concave-convex portions are in contact with the protrusion when the second member and the rotary control move closer together up to a specific distance.
Data Source
AI summary
A viewfinder fixing device comprises a holder, a ring, a washer, a dowel, and a plurality of inner peripheral concave-convex portions. The holder has a male thread portion. The ring has a female thread portion that meshes with the male thread portion. The washer is provided between the holder and the ring. The dowel is provided to the washer. The inner peripheral concave-convex portions are provided in the peripheral direction to the ring, and when the ring is turned, the male thread portion and the inner peripheral concave-convex portions cause the holder and the ring to move closer together, which is accompanied by the washer and the ring moving closer together, and the inner peripheral concave-convex portions come into contact with the dowel when the washer and the ring have moved closer together up to a specific distance.