Stapler Leg-Flatting Device with Labor-Saving Lever
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Solution Overview
Problem
Conventional staplers with leg-flatting devices require high force to operate, have complex structures leading to high manufacturing costs, and are prone to tipping over when refilling staples due to the need for large angle pivoting of the trigger lever.
Innovation Solution
A stapler with a labor-saving lever system and a single fulcrum transmission system that includes a supporting base, magazine assembly, trigger assembly, and leg-flatting device, featuring a sliding base and anvil element, which simplifies the structure and allows efficient force transmission to bend staples flatly, reducing the need for high force and stabilizing the stapler during refilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional leg-flatting device with a V-shaped driving element connected to the front end of the trigger lever is used, then the staple legs can be flattened, but a large force is needed to operate the stapler
Solution Approach 1:
The patent inverts the conventional connection arrangement by connecting the driving element to the rear end of the trigger lever instead of the front end. This inversion creates a more favorable mechanical advantage ratio, reducing the operational force required while maintaining structural simplicity
Solution Approach 2:
The patent introduces a vertical dimension to the force transmission path by using a vertically extending driving element that engages with the trigger lever at its rear end. This dimensional change optimizes the lever arm length and force application point, achieving labor-saving operation without complicating the horizontal structure
2Ease of operation
If the driving element is connected to the front end of the trigger lever, then the structure can be simple, but a large force is needed to operate the stapler
Solution Approach 1:
By inverting the connection position from the front end to the rear end of the trigger lever, the patent achieves both reduced operational force and maintained manufacturing simplicity. The rear-end connection point naturally provides better mechanical advantage while requiring no additional complex components
3Ease of operation
If the trigger lever is pivoted to a large angle to open the staple magazine for refilling, then the magazine can be accessed, but the stapler easily turns over
Solution Approach 1:
The patent incorporates a magazine release mechanism that can be actuated with minimal trigger lever movement. This preliminary action design allows the magazine to be opened without requiring large-angle pivoting, maintaining stapler stability while enabling convenient refilling
Solution Approach 2:
The patent introduces a release mechanism as an intermediary between the trigger lever and the magazine assembly. This mediator translates small trigger movements into sufficient magazine opening action, eliminating the need for large-angle pivoting that would cause the stapler to tip over
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 achieves a labor-saving capability with reduced operational force and simplified structure, ensuring stable operation during refilling and effective staple flattening, with the output force being 2.5 times the input force, enhancing user convenience and safety.
Implementation Method 1
When the trigger lever is moved downward, the pushing element will be moved to push the sliding base of the leg-flatting device to move backward, so as to release the block on the moving base, thereby the moving base can be moved downwardly to bend the legs of a released staple flatly
Implementation Method 2
the present invention tends to provide a stapler with a labor-saving lever system and a transmission system of the stapler having a single fulcrum to bend legs of staples flatly, simplify structure of the stapler and have a labor-saving capability
Data Source
AI summary
A stapler has a supporting base, a magazine assembly, a trigger assembly and a leg-flatting device. The trigger assembly has a trigger lever and a pushing element. The pushing element is mounted pivotally on the trigger lever with a pivot and has two pushing arms extending toward the supporting base. The leg-flatting device is mounted on the supporting base and has a sliding base, a moving base and an anvil element. The sliding base is slidably mounted on the supporting base and has a pushed segment corresponding to and selectively pushed by the pushing arms. The moving base is selectively blocked by the sliding base to keep the moving base from moving downwardly before the sliding base sliding relative to the supporting base and has an elongated hole. The anvil element is mounted in the elongated hole in the moving base.