Reversible Threaded Resistance Sensing for Exercise Equipment
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Solution Overview
Problem
Conventional resistance sensing designs in exercise equipment suffer from limited sensitivity due to unilateral action mechanisms, resulting in reduced detection accuracy and longer sensing times.
Innovation Solution
A resistance sensing apparatus with a reversible threaded mechanism and guide rod system that allows for relative movement between sensing members, reducing actuating stroke and enhancing detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a unilateral action mechanism is used with only one movable sensing member, then the structure is simple, but the position change between sensing members is not obvious leading to limited sensitivity
Solution Approach 1:
The patent inverts the conventional unilateral sensing approach by making both sensing members movable through a reversible threaded mechanism. When the adjusting shaft rotates, both the first threaded member and second threaded member move in opposite directions, causing both sensing members to change position simultaneously. This bidirectional movement amplifies the position change signal, significantly improving detection sensitivity compared to the traditional single-movable-member design.
2Loss of time
If a conventional sensing mechanism is used, then the structure is straightforward, but the actuating stroke is long and sensing time is extended
Solution Approach 1:
The patent employs a dynamic reversible threaded mechanism where both sensing members are actively moved during resistance adjustment. As the adjusting shaft rotates, the threaded portions convert rotational motion into linear motion for both sensing members simultaneously. This dynamic bidirectional movement reduces the required actuating stroke and accelerates the sensing process, cutting down sensing time compared to conventional static or unilateral mechanisms.
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 apparatus effectively shortens sensing time and improves detection sensitivity by enabling precise resistance monitoring in exercise equipment.
Implementation Method 1
The adjusting shaft comprises a first threaded portion and a second threaded portion have threads thereof extending in reversed directions. The first threaded member is threaded onto the first threaded portion of the adjusting shaft and pivotally connected to the adjusting base. The sensing unit comprises a second threaded member threaded onto the second threaded portion of the adjusting shaft.
Data Source
AI summary
A resistance sensing apparatus for exercise equipment includes a resistance adjusting assembly and a sensing unit. The resistance adjusting assembly includes an adjusting unit, a tubular member disposed above the adjusting unit, and an adjusting shaft mounted in the tubular member. The adjusting shaft has a first threaded portion and a second threaded portion formed thereon. The adjusting unit is threaded onto the first threaded portion. The sensing unit includes a second threaded member threadedly engaged to the second threaded portion, a first sensing member is disposed on one of the adjusting unit and the second threaded member, the second sensing member is disposed on the other of the adjusting unit and the second threaded member. By adjusting the adjusting unit and the second threaded member, a distance of the first and the second sensing member is changed and generates corresponding signals.