Stapler Handle Assembly Pivot Adjustment for Force Reduction
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Solution Overview
Problem
Existing staplers require excessive force to operate due to the large reaction force of the power spring, leading to loud noise and increased risk of breakage when detaching the handle from the plunger.
Innovation Solution
A stapler design featuring a handle assembly with a first and second link, rollers, and a connector, along with a buffer device, which reduces the pressing force by changing the pivot position of the second roller and connector, allowing gradual detachment of the handle stop from the plunger, and includes an elongate power spring and plunger for efficient stapling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle portion is pressed to the lowest position to complete stapling, then the stapling function is achieved, but the reaction force of the power spring becomes largest making it difficult to detach the handle from the plunger
Solution Approach 1:
The patent applies the dynamics principle by making the pivot point position adjustable rather than fixed. The pivot point can move along the handle portion, allowing the user to change the leverage arm length and optimize the force required for both stapling and handle detachment operations
Solution Approach 2:
The patent changes the parameter of pivot point position to resolve the contradiction. By allowing the pivot point to be repositioned, the system can optimize the mechanical advantage for different operational phases - during stapling the pivot is positioned for maximum force, and during detachment it can be repositioned to reduce the spring reaction force impact
2Productivity
If excessive force is exerted to operate the stapler, then the stapling function is achieved, but loud noise is generated and the stapler is easy to be broken
Solution Approach 1:
The adjustable pivot point enables dynamic optimization of force application, allowing the user to achieve stapling with controlled force rather than excessive force, thereby reducing noise and breakage risk
Solution Approach 2:
The buffer device is installed beforehand at the connection between the power spring and plunger to cushion the impact and reduce the harmful effects of force transmission, preventing breakage and noise before they occur
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
Reduces the strength required for stapling, minimizes noise, and extends the stapler's lifespan by preventing violent impact between the plunger and body during operation.
Implementation Method 1
an elongate power spring disposed in the body between the magazine assembly and a handle assembly
Implementation Method 2
a buffer device installed on the connection of the elongate power spring and the plunger
Data Source
AI summary
A stapler has a body including two holes formed on two sidewalls thereof and a first link defined on one sidewall thereof. A magazine is assembly installed in the bottom of the body. A handle assembly includes a handle lever formed on an end thereof and a handle stop defined on another end thereof. A second link and a through hole are between the handle lever and the handle stop. A connector is disposed in the second link and pivotally couples to the two holes, and a first roller is inserted through the through hole and moves rotatably in the first link of the body. A power spring is disposed in the body, and a plunger includes a first hole and a second hole. When the handle lever is pressed downwardly and the handle stop lifts the plunger upwardly, the first roller is driven to move rotatably in the first link of the body to detach the handle stop from the plunger gradually.