Hand Dispenser for Stretch Wrap with Adjustable Tension
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Solution Overview
Problem
Existing hand dispensers for stretch wrap film lack efficient one-handed operation, adjustable tension control, and compatibility with different film widths, often requiring two hands and complex mechanisms for tension management.
Innovation Solution
A hand dispenser featuring a molded handle with prongs, a notched cylindrical collar with flexible sections and a flange, and a foam sleeve for cushion grip, allowing one-handed operation with adjustable tension through the foam sleeve's braking action and accommodating various film widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional hand dispenser with multiple components is used, then tension control capability is improved, but device complexity increases and one-handed operation becomes difficult
Solution Approach 1:
The patent combines the handle, braking mechanism, and tension control features into a single integrated dispenser body. The hollow cylindrical body houses internal braking components while the external handle provides both structural support and operational control, eliminating the need for separate tension control devices and enabling one-handed operation.
Solution Approach 2:
The handle serves multiple functions: it provides structural support for the dispenser body, acts as a grip for one-handed operation, and incorporates braking surfaces that engage with the film roll core to control tension. This multi-functionality reduces the number of separate components needed in the system.
2Ease of manufacture
If a simple handle design is used, then ease of manufacture is improved, but tension control capability deteriorates
Solution Approach 1:
The braking surfaces within the hollow cylindrical body can be adjusted to change the friction coefficient between the brake elements and the film roll core. This adjustment mechanism allows the same molded handle design to provide variable tension control across different operating conditions while maintaining manufacturing simplicity.
3Adaptability or versatility
If a fixed-width dispenser is used, then manufacturing precision is improved, but adaptability to different film widths deteriorates
Solution Approach 1:
The dispenser features an adjustable film guide system that can be repositioned along the length of the dispenser body to accommodate different film widths. This dynamic adjustment capability allows the same device to work with various film sizes without requiring multiple specialized dispensers, balancing versatility with reasonable design complexity.
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
Enables efficient, one-handed dispensing of stretch film with adjustable tension, ensuring uniform wrapping across the film width and easy replacement of film rolls, suitable for narrow to wider film sizes.
Implementation Method 1
The snug fit compresses the flexible sections of the notched cylinder enough to act as a slight brake against the extended core
Implementation Method 2
additional pressure applied to the handle at this point forces the notched cylinder to compress against the extended core
Data Source
AI summary
A hand dispenser for stretch film. The stretch film from the hand dispenser is dispensed by using one hand from a person. The hand dispenser comprises a handle with prongs, a collar with a flange and a notched cylinder with flexible sections, and a foam sleeve for a cushion grip. The handle prongs are inserted into the extended core of the roll. The film is wound around one end of the extended core.