Overmolded Retaining Element for Blender Blade Sealing
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Solution Overview
Problem
Blenders often experience food or liquid leakage through the aperture in the container where the drive shaft of the blade assembly extends, due to the lack of an effective sealing mechanism when coupling the blade assembly to the container.
Innovation Solution
A retaining element with a main body portion, an overmolded portion, and a threaded portion is used to couple the blade assembly to the container, featuring a locking projection that inhibits rotation and provides a seal between the retaining element and the container, utilizing an elastic polymer for enhanced sealing and resistance to rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple aperture is provided in the container for the drive shaft to extend through, then the blade assembly can be easily coupled to the container, but food or liquid can leak through the aperture
Solution Approach 1:
The retaining element is divided into a rigid main body portion (steel) and a compliant overmolded portion (elastomeric material), where each segment performs a specific function: the rigid portion provides structural support and threading, while the overmolded portion provides sealing and locking projections to prevent leakage
Solution Approach 2:
The retaining element combines two different materials - steel for the main body portion and elastomeric material for the overmolded portion - to achieve both mechanical strength for coupling and flexible sealing properties to prevent food or liquid leakage through the aperture
2Reliability
If a locking mechanism is added to prevent rotation of the retaining element, then the coupling becomes more secure, but the device complexity increases
Solution Approach 1:
The locking projection on the retaining element automatically engages with the rib on the container wall when the retaining element is screwed onto the container, providing self-locking functionality without requiring additional complex mechanisms or components
Solution Approach 2:
The overmolded portion made of elastomeric material acts as a flexible element that deforms during assembly to engage the locking projection with the container rib, providing both locking and sealing functions through a single compliant component rather than multiple rigid parts
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 effectively prevents leakage by creating a secure seal and providing greater resistance to rotation in the loosening direction, ensuring a tight coupling between the blade assembly and the container while allowing easy tightening, thus maintaining a proper sealing pressure.
Implementation Method 1
The overmolded portion comprises an elastic polymer
Implementation Method 2
The locking projection is configured to provide greater resistance to rotation of the retaining element in a loosening direction than in a tightening direction
Data Source
AI summary
A retaining element is provided for coupling a blade assembly to a container of a blender apparatus that includes a main body portion, an overmolded portion, and a threaded portion for threadably coupling the blade assembly to the retaining element about a rotational axis to couple the blade assembly to the container. The retaining element further includes an optional locking projection configured to inhibit rotation of the retaining element about the rotational axis when the blade assembly is coupled to the container by way of the retaining element. The overmolded portion comprises the locking projection.