Stored Energy Stapler Torsion Spring Mechanism
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Solution Overview
Problem
Desk-top staplers require significant user force to staple multiple sheets of paper, leading to potential jamming and damage when too many sheets are inserted, as the staple legs may buckle or fail to pass through completely.
Innovation Solution
A stored energy stapler design featuring a base portion, levers, a torsion spring, and a latch mechanism that stores potential energy and converts it into kinetic energy to drive staples through paper, reducing the need for direct user force and preventing jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If significant user force is applied to drive staples through multiple sheets of paper, then the staple can penetrate through more sheets, but the staple legs may buckle or the stapler may jam, causing damage to sheets or staples
Solution Approach 1:
The torsion spring is pre-loaded to store potential energy before the stapling operation. This preliminary energy storage allows the staple to be driven through multiple sheets without requiring additional force from the user during the actual stapling action, thus preventing buckle and jamming while maintaining high penetration capability.
Solution Approach 2:
The latch mechanism enables a periodic operation cycle where the spring is gradually loaded during the charging phase and then rapidly discharged during the stapling phase. This periodic action converts gradual user input into a concentrated force pulse, achieving high staple penetration while maintaining control and reliability.
2Ease of operation
If a torsion spring and latch mechanism are added to store and release energy, then user effort is reduced and multiple sheets can be stapled reliably, but the device complexity increases
Solution Approach 1:
The torsion spring, latch mechanism, and trigger assembly are integrated into a unified energy storage and release system. The spring is coupled to both levers, and the latch mechanism coordinates the charging and discharging phases, merging multiple functions into a compact mechanism that reduces overall system complexity while maintaining ease of operation.
Solution Approach 2:
The latch mechanism automatically controls the energy release timing based on trigger activation. Once the user activates the trigger, the system self-regulates the spring discharge sequence without requiring additional user intervention, reducing operational complexity while maintaining ease of use.
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 stapler efficiently staples multiple sheets with reduced user effort, minimizing the risk of jamming and damage by utilizing stored energy to drive staples through, ensuring secure fastening without buckling or incomplete penetration.
Implementation Method 1
a torsion spring coupled to both the first lever and the second lever that biases the back ends of the first and second levers apart from one another
Data Source
AI summary
A stored energy stapler includes a base portion and a first lever pivotally coupled to the base portion. The first lever includes a front end and a back end. The stapler also includes a second lever pivotally coupled to the base portion about a pivot point, the second lever having a front end and a back end, and a striker element at the front end for driving a staple out of the stapler. The stapler also includes a torsion spring coupled to both the first lever and the second lever that biases the back ends of the first and second levers apart from one another. The pivot point is disposed between the striker element and the torsion spring.