Fastener Driving Tool Locking Mechanism Reduces Handle Force
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Solution Overview
Problem
Existing fastener driving tools require significant effort to operate, particularly in transitioning the striking member from the energy-storing state to the striking state, due to the need to overcome forces that pull the locking member's engaging end away from the striking member's slot.
Innovation Solution
The fastener driving tool incorporates a housing unit with a torsion spring and a locking member, where the handle unit presses down to store energy, and the locking member's engaging end is designed to disengage from the striking member's slot, allowing the stored biasing force to drive the striking member downward for fastener striking, reducing the effort required by shortening the upward movement of the striking member and indirectly reducing the force needed to press the handle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the locking member's engaging end is designed to disengage from the striking member's slot, then the effort required to operate the tool is reduced, but the device complexity increases
Solution Approach 1:
The locking member is designed to dynamically transition between engaged and disengaged states with respect to the striking member's slot. During the energy-storing state, the locking member engages with the slot to maintain positioning. When transitioning to the striking state, the locking member disengages from the slot, allowing the striking member to move freely under the biasing force. This dynamic engagement/disengagement mechanism reduces operational effort while managing complexity through controlled state transitions.
Solution Approach 2:
The handle unit is designed to perform preliminary action by pressing down during the energy-storing state, which stores biasing force in the torsion spring and positions the locking member for subsequent disengagement. This preliminary action prepares the system for the striking state, reducing the effort needed during actual fastener striking while the preliminary positioning mechanism manages overall device complexity.
2Force
If the upward movement of the striking member is minimized, then the force needed to press the handle is reduced, but the energy-storing mechanism complexity increases
Solution Approach 1:
The torsion spring mechanism changes the parameter of force distribution by storing biasing force during the energy-storing state and releasing it during the striking state. The spring's torsional properties allow it to accumulate energy when the handle is pressed and then release this energy to drive the striking member downward, reducing the force needed during operation while managing mechanism complexity through elastic energy storage.
Solution Approach 2:
The torsion spring acts as an intermediary between the handle unit's pressing action and the striking member's movement. It receives the pressing force, stores it as elastic potential energy, and then releases it to drive the striking member. This intermediary mechanism reduces the direct force requirement on the handle while the spring's mechanical properties manage the complexity of the energy-storing system.
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
This design reduces the labor and effort needed to operate the tool by minimizing the upward movement of the striking member and distributing the force required to press the handle, achieving a more efficient fastener driving operation.
Implementation Method 1
The torsion spring has a coil sleeved on the second fixed axle to be twistable about the second fixed axle
Implementation Method 2
The return spring is disposed between the bent arm and the housing unit for biasing the bent arm upwardly
Implementation Method 3
The elastic member is disposed between the locking member and the handle unit for biasing the locking member toward the first fixed axle
Data Source
AI summary
A fastener driving tool includes a housing unit with a fastener striking opening, a striking member with an engaging slot, a locking member with a front engaging end detachably engaged to the engaging slot, and a handle unit pivoted on the housing unit. When the handle unit is pressed down to shift the driving tool from an initial to an energy-storing state, the locking member is driven to move the striking member away from the striking opening. When the handle unit is pressed down continuously to shift the driving tool from the energy-storing to a striking state, the front engaging end is driven to disengage from the engaging slot, and the striking member is driven to move down to the striking opening for performing a striking stroke.