Adjustable Hinge for Rotationally Molded Delivery Cart Assembly
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Solution Overview
Problem
Rotational molding techniques often result in inconsistent production of mobile serving carts, leading to assembly difficulties and rendering components useless due to misfitting parts, which increases production costs and decreases efficiency.
Innovation Solution
A mobile delivery cart design featuring an adjustable hinge with a plurality of facets and an off-center bore, allowing for rotational alignment and secure coupling of doors to side panels, along with an expandable end table and magnet system, to accommodate manufacturing inconsistencies and ensure proper assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotational molding technique is used to manufacture cart components, then production speed and cost efficiency are improved, but manufacturing precision deteriorates due to inconsistencies in pressure, temperature, and material purity
Solution Approach 1:
The hinge incorporates an adjustable bore position that can be shifted to compensate for dimensional variations in rotationally molded components. This allows the hinge to adapt to different component sizes and shapes while maintaining proper alignment and function, effectively decoupling the manufacturing process constraints from the final assembly requirements
2Ease of manufacture
If rotational molding is used for door and panel production, then ease of manufacture is improved, but reliability deteriorates due to misfitting components that may render the product worthless
Solution Approach 1:
The hinge features a movable and adjustable bore that can be repositioned along the hinge body to accommodate variations in door and panel dimensions. This dynamic adjustment capability ensures reliable assembly even when rotational molding produces components with slight dimensional deviations, preventing misfitting issues that would compromise product reliability
3Device complexity
If traditional fixed hinge design is used, then device complexity is reduced, but adaptability deteriorates because the hinge cannot accommodate manufacturing variations
Solution Approach 1:
The hinge is divided into distinct functional segments: a fixed mounting portion attached to the cart frame, and an adjustable portion with a movable bore that can be repositioned to accommodate door variations. This segmentation allows the simple fixed mounting to coexist with the adaptive adjustable portion, resolving the contradiction between simplicity and adaptability
Data Source
AI summary
A food service cart comprising a removable and adjustable hinge which accommodates for the normal inconsistences that are inherent with the rotational molding process. The hinge comprises a bore which is defined off-center relative to its longitudinal axis, allowing the bore to be selectively adjusted relative to a side panel and a door of the food service cart and provide a proper alignment there between. A plurality of facets disposed on the hinge ensure that it does not further rotate as the door is being rotated relative to the side panel. The food service cart also includes an expandable end table which forms a flush service with a side panel of the cart when in a collapsed or contracted configuration. A plurality of tray supports are disposed in the food service cart along with a flume defined therein which assists in the transfer of heat through the food service cart.