Y-Shaped Synthetic Resin Bottle Handle with Localized Thickness
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Solution Overview
Problem
Existing synthetic resin bottle handles are heavy and costly, and there is a need for a lightweight alternative without compromising injection moldability and functionality.
Innovation Solution
An injection-molded Y-shaped handle with a grip plate and fitting bent beams, featuring thin plate portions and thick vertical slip portions to maintain rigidity and resin flowability, is secured to the bottle using an insert molding method, ensuring weight savings and stable bottle support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the thickness of the grip plate is reduced to achieve weight saving, then the weight of the handle is reduced, but the rigidity of the grip plate decreases
Solution Approach 1:
The grip plate is designed with non-uniform thickness: thin plate portions (reduced thickness) on both sides for weight reduction, while vertical slip portions (thick portions) are maintained at full thickness to preserve rigidity. This local differentiation allows the handle to be lightweight overall while maintaining structural strength where needed for hand gripping.
2Weight of moving object
If the thickness of the grip plate is reduced to achieve weight saving, then the weight of the handle is reduced, but the injection moldability deteriorates due to decreased resin flowability
Solution Approach 1:
The grip plate incorporates thick vertical slip portions that serve as resin flow channels during injection molding. These thick portions maintain adequate resin flowability and pressure, ensuring proper filling of the mold cavity despite the overall reduced thickness of the grip plate for weight savings.
Solution Approach 2:
The vertical slip portions are designed in advance as thick structural elements that will serve dual purposes: maintaining rigidity for hand gripping and providing adequate resin flow paths during injection molding. This preliminary design ensures both manufacturing feasibility and functional performance.
3Weight of moving object
If the thickness of the grip plate is reduced to achieve weight saving, then the weight of the handle is reduced, but the cost reduction is limited without compromising functionality
Solution Approach 1:
By reducing the thickness only in specific areas (thin plate portions on both sides) while maintaining full thickness in critical areas (vertical slip portions), the design achieves weight reduction without compromising structural integrity or manufacturing feasibility, thereby reducing material cost while maintaining functionality.
Data Source
AI summary
This invention is aimed at material saving and cost reduction. A technical problem to be solved by the invention is to provide a light-weight Y-shaped handle without impairing injection moldability and the functions of the handle. The principal means of solving the above-described technical problem is an injection molded handle used by being fitted and secured firmly to a rear portion of a body of a synthetic resin bottle by an insert molding method. The handle comprises a pair of fitting bent beams disposed in parallel in an upright posture and fitted by an undercut engagement to a rear portion of a body of a bottle, a grip plate in a vertical and long rectangular shape disposed between the pair of the fitting bent beams, and a circular gate area disposed at a center of the grip plate, wherein the thickness of the grip plate is reduced on both sides thereof in a certain height range to form thin plate portions, while leaving, as thick portions, a near-gate area including and surrounding the gate area in a concentric manner and vertical slip portions extending up- and downward from the near-gate area.