Leg Extension Machine Weight Stack Adjustment
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Solution Overview
Problem
Existing fitness equipment for leg extension and flexion requires multiple weight plates for different intensity levels, leading to high costs, cumbersome adjustments, and limited flexibility in resistance adjustments, affecting training adaptability and efficiency.
Innovation Solution
An all-in-one machine with a weight assembly that includes a connecting arm and a weight arm, allowing for reciprocal sliding and rotational adjustment using a guide sliding rod and clamping structures, enabling continuous resistance adjustment without adding or removing weight plates, and a swinging mechanism for leg exercises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple weight plates are used to achieve different resistance levels, then resistance adjustment flexibility is improved, but device complexity and storage requirements increase
Solution Approach 1:
The patent combines multiple weight plates into a single integrated weight stack assembly that can be adjusted in a unified manner. The weight stack includes multiple plates of different weights that can be selectively positioned, eliminating the need for separate weight plate storage and management while maintaining resistance adjustment flexibility.
Solution Approach 2:
The weight stack assembly serves multiple functions: it provides various resistance levels through different plate configurations, acts as a unified weight adjustment mechanism, and eliminates the need for separate storage spaces for individual weight plates. This multi-functional design addresses both adaptability and complexity concerns.
2Adaptability or versatility
If weight plates are removed or stacked to adjust resistance, then resistance level change is achieved, but operation time and labor intensity increase
Solution Approach 1:
The patent introduces a dynamic adjustment mechanism where the weight stack can be quickly reconfigured through a rotational or sliding action that allows users to switch between different resistance levels without manually removing or stacking individual plates. This dynamic mechanism significantly reduces adjustment time while maintaining the ability to achieve various resistance levels.
Solution Approach 2:
The weight stack is pre-configured with multiple plates of different weights in a predetermined arrangement. Users can quickly access and select desired resistance levels by simply rotating or sliding the weight stack to the pre-positioned configuration, eliminating the need for time-consuming manual assembly or disassembly of weight plates.
3Adaptability or versatility
If fixed-weight plates are used for resistance adjustment, then weight adjustment is achieved, but continuous or fine-tuned resistance adjustment is prevented
Solution Approach 1:
The weight stack is segmented into multiple individual plates of different weights that can be selectively positioned or combined. This segmentation allows for both discrete weight adjustments (using whole plates) and fine-tuned adjustments (by combining smaller plates), achieving both coarse and precise resistance control within a single unified mechanism.
Solution Approach 2:
The patent enables continuous resistance adjustment by allowing the weight stack to be rotated or slid to different positions, changing the effective weight parameter continuously rather than in discrete steps. This parameter change mechanism provides both coarse resistance levels and fine-tuned adjustments, achieving high precision without requiring multiple separate weight plate sets.
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
Enables precise and efficient resistance adjustments with high stability, improving training efficiency and adaptability by allowing users to dynamically switch resistance intensities through lever principles and snap-fit clamping mechanisms.
Implementation Method 1
dynamically adjusting the counter-torque of the weight arm using the lever principle
Implementation Method 2
the second clamping part is capable of being selectively engaged with any of the first clamping parts to achieve locking and restrict sliding of the weight arm
Data Source
AI summary
The present disclosure relates to an all-in-one machine for leg extension and flexion, comprising: a body and a swinging mechanism; and a weight assembly, mounted on the body and operably linked with the swinging mechanism; wherein the weight assembly comprises a connecting arm rotationally connected to the body, the connecting arm is provided with an orientation part along its length direction, a weight arm is mounted on the orientation part, and the weight arm is capable of reciprocally sliding along the orientation part and rotate around the orientation part.