Wire Strainer Chain Restraint for Twist-Free Pawl Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing agricultural wire strainers face difficulties when releasing the strainer from the chain, as the pawls need to walk backwardly on a potentially twisted and untensioned chain, making it challenging to disengage and re-engage the pawls correctly.
Innovation Solution
The introduction of a chain restraint mechanism with a protruding arm that guides the chain, maintaining it straight and untwisted, allows the pawls to walk along the chain efficiently and facilitates easy disengagement and re-engagement of the pawls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the strainer is held in various orientations for different working conditions, then the adaptability of the strainer is improved, but the chain may become twisted and difficult to disengage
Solution Approach 1:
A guide means comprising a protrusion extending from the walker bar is introduced as an intermediary element. This protrusion guides the excess chain during straining operations and maintains proper chain alignment, ensuring the chain remains straight and untwisted regardless of strainer orientation, thereby facilitating easy disengagement
Solution Approach 2:
The guide means is positioned to preliminarily guide the chain before the pawls engage with it. By maintaining proper chain alignment in advance through the protrusion, the system prevents twisting from occurring in the first place, making subsequent disengagement operations straightforward
2Ease of operation
If the pawls walk backwardly on the chain during release, then the strainer can be disengaged, but the operation becomes difficult when the chain is twisted
Solution Approach 1:
The guide means with its protrusion acts as a mediator that maintains chain alignment stability throughout the release operation. By guiding the excess chain, it ensures the chain remains straight and properly aligned even when pawls move backward, making the release operation easy to perform
3Device complexity
If no guide means is provided for the excess chain, then the device complexity is reduced, but the chain becomes twisted and hard to operate
Solution Approach 1:
The guide means is implemented as a simple protrusion extending from the walker bar, segmenting the chain path into a guided portion and an unguided portion. This minimal structural addition effectively guides the excess chain without requiring a complex guide mechanism, maintaining ease of pawl movement while adding only necessary functionality
Solution Approach 2:
The protrusion serves as a simple intermediary element that provides the necessary chain guidance. This minimal guide means structure is sufficient to prevent chain twisting and facilitate smooth pawl movement, achieving the desired operational ease with minimal added complexity
Data Source
AI summary
A chain restraint for a pawl operated wire strainer is disclosed. The wire strainer (100) has a handle (11) with a walker bar (12) extending from the handle (11), and a pair of pawls (13,14) pivoted on the walker bar (12). The walker bar (12) and pawls (13,14) substantially define an operating plane (18,19) of the wire strainer (10), wherein said chain restraint (30) comprises a protrusion extending outwardly from said operating plane (18,19). A wire strainer (100) having at least one chain restraint (30) is also disclosed.