Oar Shaft Angle Adjustment Using an Oblique Slider Guide
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Solution Overview
Problem
Adjusting the blade angle between a sleeve and a rowlock requires time-consuming machining of the sleeve, making it difficult to easily change the angle of the shaft relative to the sleeve.
Innovation Solution
An angle changeable apparatus with a shaft-side member and a sleeve-side member, including a slider that allows for relative rotation between the two, enabling easy adjustment of the shaft angle by sliding the slider, which has a first guiding part and a second guiding part that facilitate rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the blade angle is adjusted by machining the sleeve on land, then the shaft angle can be precisely adjusted, but the adjustment process requires significant time and cannot be performed on the boat
Solution Approach 1:
The invention transforms the static, fixed-angle sleeve into a dynamic system where the slider can move along the shaft to continuously adjust the blade angle. The slider's position relative to the shaft-side member determines the effective angle, allowing dynamic adjustment from 0 to 90 degrees without machining operations.
Solution Approach 2:
The invention divides the previously integrated sleeve into separate components: a shaft-side member, a sleeve-side member, and a movable slider. This segmentation allows the angle adjustment function to be independent from the structural sleeve, enabling precise angular positioning through the slider's position rather than through machining the entire sleeve.
2Adaptability or versatility
If the sleeve is made as a single integrated piece, then the structure is simple and strong, but the blade angle cannot be easily changed
Solution Approach 1:
The invention introduces a movable slider that transforms the fixed-angle sleeve into an adjustable-angle mechanism. The slider's ability to move along the shaft direction and its interaction with the guiding parts create a dynamic system where the blade angle can be continuously changed according to the slider's position.
Solution Approach 2:
The slider acts as an intermediary component between the shaft-side member and the sleeve-side member. It mediates the angular adjustment by its position and orientation, allowing the two members to achieve relative rotation while maintaining structural integrity through the guiding parts.
3Ease of operation
If the slider is constrained only in the shaft direction, then the structure is simple, but relative rotation between shaft-side and sleeve-side members cannot occur
Solution Approach 1:
The invention adds a rotational dimension to the slider's movement by introducing guiding parts that extend in oblique directions. The first guiding part extends in the shaft direction while the second guiding part extends at an angle, creating a mechanism where linear slider movement translates into rotational motion between the shaft-side and sleeve-side members.
Solution Approach 2:
The dual guiding parts create a dynamic constraint system where the slider's movement in three-dimensional space automatically produces the desired relative rotation. The oblique orientation of the second guiding part converts the slider's linear displacement into angular adjustment between the two members.
Data Source
AI summary
The present invention provides an angle changeable apparatus and an oar such that the shaft angle is easily adjustable. Disclosed is an angle changeable apparatus 1 for variably changing an angle of a shaft 110 inserted in a sleeve 10, including: a shaft-side member 20 fixed to the shaft 110; a sleeve-side member 30 fixed to the sleeve 10; and a slider 40 configured to slide between the shaft-side member 20 and the sleeve-side member 30, wherein the shaft-side member 20 has a first guiding part extending in a shaft direction, the sleeve-side member 30 has an elongated hole 31 extending in an oblique direction relative to the shaft direction, the slider 40 has a groove 41c guided by the first guiding part and a slider main body 41 guided by the elongated hole 31.