Stapler Limiting Lever Center of Gravity Stability
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Solution Overview
Problem
Traditional staplers require significant strength for continuous use, leading to user fatigue and often fall over when opened to load staples due to their complex and costly designs.
Innovation Solution
A stapler design featuring a base assembly, magazine assembly, and trigger assembly with a limiting lever that maintains the center of gravity over the base, preventing excessive pivoting and falling, while reducing the effort required for stapling through a balanced mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an articulated lever assembly is used to reduce stapling effort, then user fatigue is reduced, but the device complexity increases and cost increases
Solution Approach 1:
The patent extracts the essential function of the articulated lever (mechanical advantage) and implements it through a simplified cam mechanism and spring system rather than a complex multi-link articulated assembly. This maintains the labor-saving benefit while reducing structural complexity and cost.
Solution Approach 2:
The patent changes the mechanical parameters by using a cam profile and spring constant selection to achieve the desired force multiplication effect, replacing the geometric complexity of articulated levers with controlled parameter variations in simpler components.
2Ease of operation
If the trigger assembly is pivoted away from the magazine to load staples, then staple insertion is enabled, but the stapler falls over
Solution Approach 1:
The patent uses a spring-loaded mechanism that acts as a counterweight system, maintaining the center of gravity over the base during trigger assembly movement. The spring provides restoring force that prevents excessive pivoting and ensures the stapler remains stable during staple loading operations.
Solution Approach 2:
The spring mechanism automatically returns the trigger assembly to its neutral position after staple insertion, eliminating the need for manual repositioning and ensuring stability is self-maintained throughout the loading 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 stapler effectively reduces user fatigue and prevents falling when loading staples, providing a labor-saving and cost-effective solution by maintaining stability and ease of use.
Implementation Method 1
a spring assembly connected to the trigger assembly and stores energy to assist the trigger lever to penetrate the paper sheets with the staple when the trigger lever is depressed
Implementation Method 2
The base (11) has a front end, a rear end, a bottom bar and two wings (110)... The bottom spring (13) is mounted on the bottom bar of the base (11)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A stapler has a center of gravity and comprises a base assembly (10), a magazine assembly (20) and a trigger assembly (30). The magazine assembly (20) connects to the base assembly (10) and has a cap (24). The trigger assembly (30) connects to the base assembly (10) and has a trigger lever (33) and a limiting lever (31). The limiting lever (31) prevents the trigger lever (33) and the cap (24) from pivoting excessively to keep the center of gravity of the stapler over the base assembly (10) so that refilling the stapler is convenient.