Torsion Spring Fastener Driver for Lower Striking Effort
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Solution Overview
Problem
Conventional spring actuated fastener driving tools require significant operating effort due to the need for a metal leaf-spring to accumulate sufficient biasing energy for striking, making the process cumbersome and energy-intensive.
Innovation Solution
A torsion spring with a coil, weighted leg, and driving leg is integrated into the fastener driving tool, allowing for energy storage in the up-and-down direction, which reduces the operational effort required by preloading potential energy and utilizing a return spring to facilitate effortless handle movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a leaf-spring is used to accumulate biasing energy for striking, then the striking member can be moved upwardly, but a large operating effort is required to deflect the leaf-spring and move the striking member a long distance
Solution Approach 1:
The patent changes the spring mechanism from a linear leaf-spring to a torsion spring system, fundamentally altering the physical parameters of energy storage and release. The torsion spring stores energy through rotational deformation rather than linear bending, enabling more efficient energy accumulation with less operating effort
Solution Approach 2:
The torsion spring is preloaded during the upward movement of the striking member, storing biasing energy in advance before the striking action is needed. This preliminary energy storage reduces the effort required during the actual striking operation
2Strength
If the striking member is moved a long distance to bend the leaf-spring to a sufficient degree, then sufficient biasing energy is accumulated, but the operating distance and time are increased
Solution Approach 1:
The patent changes the spring mechanism from a linear leaf-spring to a torsion spring system, fundamentally altering the physical parameters of energy storage and release. The torsion spring stores energy through rotational deformation rather than linear bending, enabling more efficient energy accumulation with less operating effort
Solution Approach 2:
The torsion spring is preloaded during the upward movement of the striking member, storing biasing energy in advance before the striking action is needed. This preliminary energy storage reduces the effort required during the actual striking operation
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 torsion spring design reduces the operational effort needed to drive fasteners by preloading energy, enabling efficient and effortless downward movement of the striking member, thus improving the usability of the fastener driving tool.
Implementation Method 1
The torsion spring is twistable about the coil axle... The driving leg is biased against and engaged with the first distal end so as to be preloaded with a downward potential energy
Implementation Method 2
A torsion spring with a coil, weighted leg, and driving leg is integrated into the fastener driving tool, allowing for energy storage in the up-and-down direction
Implementation Method 3
a return spring which is disposed downwardly of the weighted leg to be compressed by the weighted leg to store a return energy
Data Source
AI summary
A fastener driving tool includes a housing, a striking member, an energy storing unit and a handle unit. The energy storing unit has a torsion spring which has weighted and driving legs extending from two ends of a coil. The driving leg is biased against and engaged with the weighted leg to be preloaded with a downward potential energy that urges a downward movement of the torsion spring and the striking member. The handle unit includes a handle and an anchoring member removably engaged with the striking member. When the handle is pivotally moved from a ready position to a striking position, the weighted leg is moved downwardly and the anchoring member and the striking member are moved upwardly to gradually increase a loading of the torsion spring for the striking member.