Torsion Spring Fastener Tool Reducing Manual Effort
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Solution Overview
Problem
Conventional spring-actuated fastener driving tools require significant manual effort due to the need for a long distance of leaf-spring deflection to accumulate sufficient biasing energy for fastener ejection.
Innovation Solution
A fastener driving tool design incorporating a torsion spring unit with a twistable energy storing assembly, including short and long legs, and a return spring, which allows for efficient energy storage and release to reduce the operational effort required for fastener ejection, utilizing a handle unit that pivots to engage and disengage the torsion spring to move the striking member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a leaf-spring is used to accumulate biasing energy for fastener ejection, then the fastener can be ejected with sufficient force, but a large operating effort is required to deflect the leaf-spring over a relatively long distance
Solution Approach 1:
The patent changes the spring mechanism from a leaf-spring system to a torsion spring system. The torsion spring accumulates energy through rotational deflection rather than linear deflection, fundamentally changing the parameter of spring deformation mode. This allows energy accumulation with smaller linear displacement of the trigger, reducing operating effort while maintaining ejection force.
Solution Approach 2:
The patent transitions from one-dimensional linear deflection of a leaf-spring to two-dimensional rotational deflection of a torsion spring. The torsion spring's legs rotate about an axis, utilizing angular displacement instead of linear displacement to accumulate energy. This dimensional change enables energy storage with reduced trigger travel distance, improving ease of operation.
2Use of energy by moving object
If a leaf-spring is deflected over a long distance to accumulate sufficient biasing energy, then adequate energy is stored for fastener ejection, but the device complexity increases due to the extended mechanism
Solution Approach 1:
The patent changes the energy storage mechanism from linear spring deflection to rotational torsion spring deflection. The torsion spring stores energy through angular displacement of its legs about a fixed axis, concentrating the energy storage function in a more compact rotational motion rather than extended linear travel, thereby reducing mechanism complexity.
Solution Approach 2:
The torsion spring's short leg is positioned within the handle structure, and the long leg extends to engage the striking member. The return spring is nested within the housing space adjacent to the torsion spring. This nested arrangement consolidates multiple components within the housing space, reducing overall device complexity and compacting the mechanism.
3Use of energy by moving object
If the handle is designed to pivot through a large angle to fully deflect the leaf-spring, then sufficient energy is accumulated, but the handling becomes less precise and more cumbersome
Solution Approach 1:
The patent replaces large-angle linear deflection with controlled rotational deflection of the torsion spring. The trigger pivots about a fixed axis, and the torsion spring legs rotate through a controlled angular range. This rotational mechanism provides more precise control over energy accumulation, improving handling precision while maintaining adequate energy storage.
Solution Approach 2:
The patent changes the deflection parameter from large linear displacement to controlled angular displacement. The torsion spring's rotational deflection can be precisely controlled through the trigger's pivoting motion, allowing the operator to accumulate the exact amount of energy needed without excessive trigger travel, thereby improving handling precision.
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 design reduces the operational effort needed to drive fasteners by allowing for greater energy storage in the torsion spring with less handle movement, facilitating smoother and more efficient fastener driving cycles.
Implementation Method 1
The energy storing unit is disposed in the housing space, and includes an energy storing assembly which has at least one torsion spring that is twistable about a fixed axle disposed rearwardly of the pivot axle
Implementation Method 2
The return spring which is disposed downwardly of the short leg to be compressed by the short leg to store a return energy
Data Source
AI summary
A fastener driving tool includes a striking member and an energy storing unit disposed in a housing. The energy storing unit has at least one torsion spring having forwardly extending short and long legs which are connected to a pivotable handle and the striking member. An anchoring member is disposed forwardly of and slidable relative to the handle and is detachably engaged with the striking member. During a pivotal movement of the handle, the short and long legs of the torsion spring are moved in opposite directions to store a biasing energy and to force the striking member upwards, which in turn moves the striking member downward for performing a fastener striking stroke once the anchoring member is disengaged from the striking member to release the torsion spring.