Rowing Apparatus Grip Lever Four-Bar Linkage Control
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Solution Overview
Problem
Existing rowing apparatuses do not allow rowers to independently control the position of oar blades during rowing in the direction they are facing, as the automatic feathering and squaring of oar blades are not influenced by the rower's actions, limiting the rower's ability to manipulate the oar blades effectively.
Innovation Solution
A four-bar linkage system with a rotating grip lever that actuates a virtually coaxial actuator rod, connected to a seesaw on the base frame, allowing the rower to rotate the oar lever and control the feathering and squaring of the oar blades by transferring the rotating movement of the grip lever to the oar lever through a toggle joint and spring configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the oar lever is automatically feathered and squared as a function of the pivot movement of the base frame, then the oar blades are automatically positioned for drive and recovery strokes, but the rower cannot independently control the position of the oar blades
Solution Approach 1:
The system separates the automatic positioning function (base frame pivot movement) from the feathering/squaring function (grip lever rotation). The grip lever is segmented as an independent control element that rotates about its own axis within the bearing body, allowing the rower to independently control oar blade orientation without interfering with the automatic positioning mechanism.
Solution Approach 2:
The grip lever is given an additional degree of freedom by allowing it to rotate about its own axis (dimensional change) in addition to the base frame's pivot movement. This second dimension of rotation enables independent control of oar blade feathering and squaring while maintaining the automatic positioning capability of the base frame.
2Ease of operation
If the grip lever is made to rotate about its axis to control oar blade feathering, then the rower can independently manipulate the oar blades, but the complexity of the linkage system increases
Solution Approach 1:
An intermediary actuator rod (coaxial to the bearing body's main axle) and a seesaw mechanism are introduced to transfer the rotational movement from the grip lever to the oar lever. This intermediary transmission path allows the grip lever's rotation to be converted into oar lever rotation without directly complicating the four-bar linkage, as the intermediary elements are coaxially aligned and integrate smoothly with the existing structure.
3Adaptability or versatility
If the actuator rod is made virtually coaxial to the main axle on the bearing body, then the bearing bodies can rotate without affecting the transmission of grip lever position, but the precision of manufacturing and assembly increases
Solution Approach 1:
The actuator rod serves multiple functions: it acts as both the transmission element for grip lever rotation and as a coaxial guide that allows the bearing body to rotate freely. By making the actuator rod virtually coaxial with the main axle, it becomes a universal element that accommodates both the transmission function and the rotation function without interference, reducing the need for separate alignment mechanisms.
Data Source
AI summary
Apparatus for rowing in the direction the rower is facing has a base frame. A main bearing for a lever with hand grip and another for a lever with oar are in the base frame. A linkage connects the lever with hand grip and lever with oar to form a counteracting four-bar linkage system. The oar lever is the driven arm of the four-bar linkage and is linked to a rotary drive that has a main axle and virtually coaxial actuator rod. The hand grip lever rotates about its axis and is mounted to a bearing body within the base frame. The hand grip lever actuates an actuator that is virtually coaxial to the main axle on the bearing body. The actuator engages with a seesaw mounted on the base frame to shift the actuator rod of the rotary drive to rotate the oar.