Plastic Joystick Arm With Overmolded Magnet for Stable Sensing
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Solution Overview
Problem
Existing joysticks face challenges in manufacturing precision due to metal control arms, leading to inaccurate measurements and increased costs, and struggle with sealing issues in outdoor environments, causing vibrations and potential dislocation of components.
Innovation Solution
A joystick with a plastic control arm made through injection molding, featuring an overmolded magnetic member and a sealing plate for water and dust protection, which maintains magnet position accuracy and reduces manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal control arms are used, then structural strength is improved, but manufacturing precision deteriorates due to difficulties in positioning magnets accurately
Solution Approach 1:
The control arm is constructed as a composite structure combining plastic base material with an overmolded magnetic member. This allows the plastic to provide the main structural framework while the magnetic member is precisely positioned through the overmolding process, achieving both structural strength and manufacturing precision.
Solution Approach 2:
The magnetic member is pre-positioned and overmolded onto the control arm during the injection molding process itself, rather than being attached separately afterward. This preliminary action ensures precise magnet positioning is built into the manufacturing process, eliminating subsequent positioning difficulties.
2Reliability
If additional operations are performed to attach magnets to metal control arms, then magnetic attachment is improved, but manufacturing cost increases
Solution Approach 1:
The manufacturing of the control arm and the attachment of the magnetic member are merged into a single overmolding operation. This eliminates separate attachment steps, reducing manufacturing complexity and cost while ensuring reliable magnetic attachment through the integrated process.
Solution Approach 2:
The magnetic member is attached to the control arm during the initial injection molding process rather than in a subsequent separate operation. This preliminary attachment action reduces the total number of manufacturing steps and associated costs while maintaining attachment reliability.
3Adaptability or versatility
If multiple switches and rollers are coupled to a printed circuit board, then control functionality is improved, but sealing performance deteriorates due to open upper surface
Solution Approach 1:
A flexible boot is used to cover and seal the upper surface of the control portion where switches and rollers are mounted. This flexible shell provides protective sealing against environmental factors while allowing the control components to function, resolving the contradiction between functionality and sealing performance.
4Duration of action of stationary object
If control arms are made of metal, then structural durability is improved, but resistance to vibration deteriorates due to magnet dislocation
Solution Approach 1:
The composite structure of plastic control arm with overmolded magnetic member provides both structural durability and vibration resistance. The plastic material has inherent vibration-damping properties, while the overmolded magnetic member is securely integrated and cannot dislocate under vibration, unlike separately attached magnets on metal arms.
Solution Approach 2:
The magnetic member is permanently integrated into the control arm structure through the overmolding process, preventing any subsequent dislocation during vibration. This preliminary integration action ensures the magnet remains fixed in position, maintaining control reliability under vibrational conditions.
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 solution provides a durable, cost-effective, and precise joystick with enhanced resistance to vibrations, ensuring accurate motion control and protection against environmental factors, while simplifying assembly and reducing production costs.
Implementation Method 1
an overmolded magnetic member suitable to interact with the sensor
Data Source
AI summary
A joystick for controlling a machine in multi-axes includes a control portion having a body in which at least one circuit board having at least one sensor is provided; a top portion having a flexible boot forming at least partly an outer periphery of the top portion provided on the control portion; a control arm mounted on a pivotal member for pivotal movement relative to the body; wherein said control arm is made of plastic in an injection-molding operation and has an overmolded magnetic member suitable to interact with the sensor, said magnetic member provided in the proximity of the circuit board wherein said control arm has a connection portion such that said flexible boot is attached to the control arm from said connection portion. Thereby usage of the overmolded control arm which made of plastic provides sensitivity, production quality and additionally, thriving resistance to vibration.