Pointing Stick Attachment Leg Welding Geometry
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Solution Overview
Problem
The miniaturization of pointing sticks for laptop computers and similar devices poses challenges in assembly due to the need for a low profile and limited installation space, leading to difficulties in maintaining consistent height and interfering with other components, which affects productivity and durability.
Innovation Solution
A pointing stick design featuring an operation member with an attachment leg that is inserted through a chamfered insertion hole in the attachment member, ensuring the leg is fixed not to protrude from the back face after assembly, using resin material for the components and a welding process that confines melted resin within a tapered chamfered portion for secure bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the pointing stick is miniaturized to achieve a low profile, then the installation space is reduced and portability is improved, but the assembly precision deteriorates due to difficulty in maintaining consistent height
Solution Approach 1:
The attachment leg is designed to be self-aligning during assembly. The leg automatically positions itself relative to the attachment member through geometric constraints, eliminating the need for external alignment tools or complex fixtures. This self-service mechanism ensures consistent assembly height even in miniaturized pointing sticks where traditional alignment methods become impractical.
Solution Approach 2:
The attachment leg incorporates a tapered portion with a specific angle that changes the geometric parameters of the connection. This tapered geometry transforms the assembly process by providing a natural wedging action that ensures consistent depth of insertion and uniform height across all attachment points, resolving the precision issues in miniaturized assemblies.
2Volume of moving object
If the pointing stick is miniaturized to achieve a low profile, then the device size is reduced, but the assembly difficulty increases due to interference with other components
Solution Approach 1:
The attachment leg is segmented into distinct functional portions: a protruding portion for insertion, a tapered portion for alignment and securing, and a fixed portion for structural support. This segmentation allows each part to perform its specific function independently, simplifying the assembly process in miniaturized devices where space constraints would otherwise cause interference between components.
Solution Approach 2:
Instead of trying to fit the attachment leg into a pre-drilled hole of precise dimensions, the design inverts the approach by having the attachment leg itself define the insertion path and depth through its tapered geometry. The leg is inserted through a through-hole and the tapered portion ensures proper positioning, reversing the traditional method of hole-defined assembly to leg-defined assembly, which simplifies manufacturing in miniaturized contexts.
3Ease of manufacture
If thermally welding resin material is used to fix the attachment leg, then the assembly process is simplified, but the manufacturing precision deteriorates due to error in crush shape after welding
Solution Approach 1:
The attachment leg is pre-formed with the tapered portion and protruding portion in the correct geometric configuration before the thermal welding process. This preliminary shaping ensures that when the leg is inserted and welded, the geometry is already optimized for proper positioning and alignment, preventing crush shape errors that would otherwise occur during the welding process itself.
Solution Approach 2:
The tapered portion of the attachment leg acts as a cushioning element that compensates for potential errors in the thermal welding process. By providing a geometric buffer zone with the tapered geometry, any minor variations in welding heat or pressure are absorbed by the tapered design rather than being transmitted to the final position and orientation of the attachment leg, thereby maintaining manufacturing precision despite the simplicity of the thermal welding process.
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
This design enables a low-profile pointing stick with improved durability and productivity by ensuring precise assembly and preventing interference with other components, while allowing for a more efficient use of space and reducing manufacturing costs.
Implementation Method 1
one end side of the insertion hole may be formed with a chamfered portion, whose diameter is gradually enlarged toward the back face of the attachment member, to confine the melted resin when a leading end of the attachment leg is fixedly welded to the attachment member
Implementation Method 2
a method for fixing an operation member to an attachment member by thermally welding resin material of the operation member
Data Source
AI summary
A pointing stick includes: an operation member, which is provided to operate a movement of a cursor displayed on a screen of an information processing device: and an attachment member, which supports the operation member to be stood, wherein an attachment leg is protruded from the operation member and is inserted through an insertion hole formed in the attachment member when assembling the pointing stick, and wherein the attachment leg is fixed to not protrude from a back face of the attachment member, which is opposite to an front face on which the operation member stands, after assembling the pointing stick.