Variable Stroke Percussion Massager Crank Mechanism
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Solution Overview
Problem
Conventional percussion massage devices have a fixed stroke length, requiring users to own multiple devices for varying massage preferences, as they cannot easily adjust the stroke length to accommodate different needs.
Innovation Solution
A handheld percussion massage device with a variable stroke length mechanism, utilizing a crank mechanism with a movable crank pin within a sliding groove, allowing users to select between predetermined stroke lengths through reversible motor-driven rotation, and adjustable speed settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed stroke length is used in conventional percussion massage devices, then the device structure is simple, but the user cannot adjust the stroke length to accommodate different massage preferences
Solution Approach 1:
The patent applies the dynamics principle by making the crank pin movable within the sliding groove instead of fixed. The crank pin can be repositioned along the sliding groove to change the stroke length, transforming a static structure into a dynamic one that adapts to different user needs while maintaining reasonable structural complexity
Solution Approach 2:
The patent segments the crank mechanism into distinct components: the crank housing with sliding groove, the movable crank pin, and the crank base. This segmentation allows independent adjustment of the crank pin position to achieve variable stroke lengths, resolving the contradiction between adaptability and complexity
2Adaptability or versatility
If a fixed stroke length is used in conventional percussion massage devices, then the manufacturing process is simple, but users need to own multiple devices for varying massage preferences
Solution Approach 1:
The dynamic positioning of the crank pin within the sliding groove enables variable stroke lengths without requiring multiple separate devices. This single-device solution with adjustable components simplifies manufacturing compared to producing multiple fixed-stroke devices, while maintaining ease of manufacture through standardized modular parts
3Ease of operation
If the crank pin is made movable within the sliding groove, then the stroke length can be adjusted, but the device complexity increases
Solution Approach 1:
The movable crank pin design enables easy stroke length adjustment by allowing the user to reposition the pin along the sliding groove. The dynamic nature of this component provides operational flexibility while the overall mechanism remains relatively simple, balancing ease of operation with acceptable device complexity
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 users to easily change the stroke length and speed of percussive massage therapy, providing customizable massage experiences with a single device, enhancing user convenience and versatility.
Implementation Method 1
a crank pin is movably secured between the crank housing and crank base such that the crank pin moves from a first end to a second end of a sliding groove located in the cam housing when a rotation direction of the single unit is reversed by a motor
Data Source
AI summary
An adjustable stroke length percussion massage device includes a stroke arm connected to a piston which is connected to a massage tool for providing a massage to a user. The stroke arm is secured to a crank pin of a crank mechanism which includes a rotatably connected crank housing and crank base, the crank pin being movably secured between the crank housing and crank base such that the crank pin moves from a first end to a second end of a sliding groove located in the cam housing when a rotation direction of the single unit is reversed by a motor. When the crank pin is moved from the first end to the second end of the sliding groove, a stroke length of the piston is changed.