Spring-Hinged Jar Lifter With Flexible Grips for One-Handed Canning
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Solution Overview
Problem
Conventional jar lifting tools are difficult to use with one hand, prone to closing by gravity, and lack secure grip and ergonomic design, especially when handling hot jars and wide-mouth containers during canning processes.
Innovation Solution
A spring-loaded center hinge and limit angle stop feature, combined with an open loop cast aluminum frame and flexible rubber grips, enhance one-handed operation, prevent excessive opening, and provide secure grip on both regular and wide-mouth jars, along with ergonomic handles for comfortable use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional closed loop bent wire rod design is used, then manufacturing is simple, but strength and weight performance are insufficient
Solution Approach 1:
The patent combines cast aluminum frame with over-molded rubber grips, creating a composite structure that leverages the strength and rigidity of aluminum while adding the flexibility and grip-enhancing properties of rubber. This resolves the contradiction by achieving superior strength through material composition rather than complex fabrication processes.
Solution Approach 2:
The frame is divided into separate cast aluminum components (handles, legs, grip sections) that are manufactured independently and then assembled. This segmentation allows each component to be optimized for its specific function while maintaining manufacturing simplicity through modular casting and assembly.
2Ease of operation
If spring-loaded center hinge is added, then one-handed operation and security feeling are improved, but device complexity increases
Solution Approach 1:
The spring-loaded hinge is designed to automatically provide the necessary resistance and return force without user intervention. The spring mechanism self-regulates the opening and closing motion, providing consistent assistance during one-handed operation while maintaining simplicity through automatic operation.
Solution Approach 2:
The hinge mechanism incorporates a spring with specific force characteristics that changes the operational parameters of the jar lifter. The spring constant and pre-load are optimized to provide appropriate resistance during closing while maintaining ease of operation, resolving the contradiction through parameter optimization rather than complex mechanisms.
3Reliability
If limit angle stop feature is added, then excessive opening is prevented, but device complexity increases
Solution Approach 1:
The limit angle stop is pre-positioned on the hinge assembly to automatically engage at the desired maximum opening angle. This preliminary positioning ensures that excessive opening is prevented before it can occur during normal operation, maintaining reliability through proactive design rather than reactive correction mechanisms.
Solution Approach 2:
Instead of using a complex locking mechanism to prevent excessive opening, the patent uses a simple stop feature that limits motion by physical contact. This inverted approach—using a positive stop rather than a negative lock—achieves the same reliability goal with minimal added complexity.
4Ease of operation
If flexible rubber grips are used, then gripping surface contact is increased, but manufacturing complexity increases
Solution Approach 1:
The rubber grips are over-molded directly onto the cast aluminum frame components, creating a composite structure where the rubber conforms to the jar surface while the aluminum provides structural support. This composite approach enhances grip security through the flexible rubber's ability to conform to various jar shapes while maintaining manufacturing efficiency through a single molding process.
Solution Approach 2:
The rubber grips are designed as flexible shells that wrap around the jar opening, using the natural elasticity and conformability of rubber material to increase surface contact area. This flexible shell approach provides superior grip security through material properties rather than complex geometric features, simplifying the manufacturing 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
The improved design allows for secure, one-handed handling of hot jars, prevents accidental closure, and ensures a snug fit on various jar sizes, enhancing user safety and ease of use around boiling water.
Implementation Method 1
a spring gradually applies increased back pressure to the user's hand
Implementation Method 2
a spring gradually applies increased back pressure
Implementation Method 3
squeeze the handles to elastically stretch the rubber form around a jar's neck
Data Source
AI summary
A pair of spring-biased pivoting levers is provided with a pair of flexible elastic grips. Each grip is contoured to conform to the surface of a jar and to elastically deform around a jar as a user squeezes the levers together. Each grip can be formed with an arcuate groove for receiving an annular rib commonly formed on canning jars.