Wire Bending Spring for Fastener Tool Energy Storage
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Solution Overview
Problem
Conventional fastener driving tools with metal leaf springs have complex manufacturing processes, high costs, and aesthetic issues due to thick plastic housings, and require additional structural elements for magazine stability.
Innovation Solution
A fastener driving tool with a wire bending spring made from a bent metal wire, integrated into a housing unit with a plastic inner assembly and metal outer assembly, simplifying manufacturing and enhancing structural strength and aesthetics, while the wire spring stores energy for striking fasteners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a metal leaf spring is used with two axial tubes soldered on top and bottom surfaces, then the spring can store energy for striking, but the manufacturing process becomes troublesome and complex
Solution Approach 1:
The spring is segmented into three functional sections: a body section for energy storage, a first arm section extending laterally to engage the striking plate, and a second arm section extending laterally in the opposite direction to engage the housing. This segmentation allows each section to be optimized for its specific function while simplifying the overall manufacturing process by eliminating the need for separate axial tubes and soldering operations.
Solution Approach 2:
The invention merges the spring body and its mounting structures into a single integrated wire bending spring component. The body section, first arm section, and second arm section are formed as one continuous piece through wire bending, combining what would otherwise require separate parts (spring body, axial tubes, mounting axles) into a single manufactured component, thereby simplifying the manufacturing process.
2Ease of manufacture
If the housing is made of plastic to be manufactured more easily, then the manufacturing cost is reduced, but the thickness must be increased to provide sufficient structural strength, which adversely affects the appearance
Solution Approach 1:
The housing is constructed as a composite structure combining plastic and metal materials. The main housing body is made of plastic for ease of manufacturing and cost reduction, while metal reinforcement elements (such as metal inserts or strengthening ribs) are incorporated at critical locations to provide the necessary structural strength without increasing the overall thickness, thereby maintaining the aesthetic appearance.
3Ease of operation
If bottom edges are formed and bent from the lateral plates to facilitate magazine sliding, then the magazine can move smoothly, but the structure of the housing becomes complicated and manufacturing cost increases
Solution Approach 1:
Instead of modifying the entire housing structure with bent bottom edges, the invention applies local quality changes by incorporating sliding facilitation features only at the specific locations where the magazine interfaces with the housing. This may include localized lubrication surfaces, guide rails, or small structural modifications at the magazine housing interface, allowing smooth magazine operation without complicating the overall housing structure.
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 manufacturing complexity and costs, improves structural strength, and enhances the tool's appearance by using a wire bending spring for energy storage, facilitating smooth magazine movement without additional positioning covers.
Implementation Method 1
The wire bending spring is mounted within the housing unit to be biased for storing a striking energy for the striking plate in the up-and-down direction
Data Source
AI summary
A fastener driving tool includes a magazine unit, a handle, a striking plate, an energy restoring member and a wire bending spring disposed to a housing unit. The housing unit includes an inner housing assembly made from a plastic material, and an outer housing assembly made from a metal material and covering the inner housing assembly. The wire bending spring is biased for storing a striking energy for the striking plate, and includes an extending section and a backwinding section. The extending section has first and second ends. The backwinding section is connected with the second end, and extends and bends toward the first end to terminate at a terminal end portion. The ratio of a height to a width ranges from 1:1 to 1:1.6.