Fastening Tool Lever Handle Roller Mechanism
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Solution Overview
Problem
Prior art fastening tool assemblies require significant driving force and complex mechanisms for loading and releasing springs to drive fasteners, which can be cumbersome and inefficient, especially for mid-range staples.
Innovation Solution
A fastening tool assembly with a housing, magazine, and biasing member that uses a lever and handle system with a roller connection to provide mechanical advantage, reducing the required driving force and simplifying the mechanism, while incorporating a latch mechanism for easy magazine extension and retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lever and handle with linkage are used to load and release the spring, then the spring can be actuated to drive fasteners, but the mechanism becomes complex and requires significant driving force
Solution Approach 1:
The patent removes the traditional linkage connecting the handle to the lever, extracting the complex transmission mechanism. Instead, the handle is directly connected to the lever through a roller that permits translation, significantly simplifying the mechanism while maintaining the ability to load and release the spring for driving fasteners
Solution Approach 2:
The connection between handle and lever is segmented into two independent rotational movements rather than a single complex linkage. The handle rotates independently and the lever rotates independently, with the roller allowing relative translation between them. This segmentation simplifies the overall mechanism structure
2Force
If a traditional linkage connects the handle to the lever, then force can be transmitted, but the required driving force becomes excessive
Solution Approach 1:
The patent extracts the complex linkage system that transmitted force from handle to lever. By removing this intermediary transmission mechanism and using direct connection with roller translation, the force required to actuate the spring is reduced while still achieving the necessary driving force for fastener ejection
Solution Approach 2:
The roller serves as a simplified intermediary between the handle and lever, permitting translation while maintaining force transmission. This mediator allows the two components to move independently through rotation while still transmitting the necessary force, reducing overall complexity and required driving force
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 solution reduces the driving force needed to operate the tool, simplifies the mechanism, and enhances user accessibility by providing a more intuitive and efficient fastening process, particularly suitable for mid-range staples, resulting in a lighter, less costly, and easier-to-use device.
Implementation Method 1
A biasing member is mounted in the housing and operably connected to the knife to bias the knife to the unloaded position
Implementation Method 2
A lever is pivotally connected to the housing. The lever has a proximal end operably engaged with the knife in the unloaded position, and a distal end extending from the housing. Application of an external force to the distal end towards the housing pivots the lever relative to the housing, thereby translating the knife from the unloaded position to the loaded position
Implementation Method 3
A roller is directly connected to the lever and the handle for permitting translation of the lever relative to the handle as the lever and the handle are pivoted relative to the housing
Data Source
AI summary
A fastening tool assembly has a magazine body in a sleeve to convey fasteners to a housing outlet. Pivoting a lever relative to the housing, translates a knife to a loaded position, thereby disengaging from the knife, permitting a spring to return the knife to an unloaded position to drive a fastener through the outlet. A handle is pivotally connected to the housing. A roller is directly connected to the lever and the handle for permitting translation of the lever relative to the handle as the lever and the handle are pivoted relative to the housing. A spring-loaded bracket is operably connected to the magazine body for translation and rotation relative to the body. A latch is mounted to the housing to engage the bracket and maintain the magazine body in a retracted position, and is movable to a disengaged position wherein the bracket extends from the magazine body.