Power Tool Anvil Locking Mechanism for Manual Tightening
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Solution Overview
Problem
Existing power tools require cumbersome switching between motor-driven and manual tightening operations, necessitating the use of additional tools and complex locking mechanisms, which complicates the process of additional tightening after motor stoppage.
Innovation Solution
A power tool design featuring a locking mechanism with a pivotally attached lock releasing member that allows the anvil to rotate freely when engaged by the hammer, enabling efficient transmission of impact force without rigidity loss, and an output shaft locking mechanism that simplifies manual fastening by allowing the tool to function as a tightening tool post-motor stoppage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a locking mechanism is added to enable manual tightening after motor stoppage, then the versatility of the power tool is improved, but the device complexity increases
Solution Approach 1:
The locking mechanism is merged with the existing hammer-anvil structure. The hammer itself serves dual purposes: as an impactor during motor-driven operation and as a manual tightening tool when locked. The lock releasing member is integrated into this existing structure rather than being a separate independent mechanism, thereby achieving versatility enhancement while minimizing additional complexity.
Solution Approach 2:
The hammer-anvil assembly is designed to perform multiple functions: it acts as the impact mechanism during powered operation and as a manual tightening device when the locking mechanism is engaged. This multi-functionality allows the power tool to serve both as a motor-driven impact tool and as a manual wrench, enhancing versatility without requiring entirely separate mechanisms.
2Ease of operation
If a lock releasing member is pivotally attached to allow free rotation during hammer engagement, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The lock releasing member is designed with pivotal attachment that allows dynamic movement: it can pivot freely during hammer rotation to accommodate the rotational motion, and can be selectively positioned to engage or disengage the locking function. This dynamic design enables easy transition between locked and unlocked states while maintaining simplicity through the use of a single pivotal connection point.
3Reliability
If the hammer is engaged with the lock releasing member prior to engagement with the anvil, then the reliability of impact force transmission is improved, but the device complexity increases
Solution Approach 1:
The hammer is designed to engage with the lock releasing member before engaging with the anvil during its rotational path. This preliminary engagement ensures that the locking mechanism is activated in advance, preventing any unintended rotation or slippage before the impact occurs. The sequential engagement sequence (lock releasing member first, then anvil) is built into the geometry and timing of the hammer's motion, ensuring reliable operation without complex control systems.
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
Facilitates seamless transition between motor-driven and manual tightening operations, reducing operational complexity and enhancing usability by allowing the power tool to function as a standalone tightening device after the motor is stopped, with efficient impact force transmission and simplified locking mechanisms.
Implementation Method 1
a hammer that is driven in a rotation direction by the driving source; an anvil that is driven in the rotation direction when engaged with the hammer
Implementation Method 2
a lock releasing member is pivotally attached to the anvil, and when the hammer is rotated, prior to the engagement of the hammer with the anvil, the hammer is engaged with the lock releasing member so as to release the locked state of the locking mechanism
Data Source
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AI summary
A power tool which has an anvil 20 that is rotated by a hammer 22 and is housed in a housing, and rotates an output shaft 18 is provided. The anvil 20 and the output shaft 18 are integrally formed into one unit, and a carrier 33 that is rotatable relative to the anvil 20 by a predetermined angle on the same axis is provided. On one portion of an outer circumferential surface of the anvil 20, a relief surface 20a is formed. Cut-out portions 33b are formed at positions opposed to each other of a carrier 33, and by allowing an engaging pin 37 to be interposed therein, a locking mechanism that limits the relative rotation between the anvil 20 and a lock ring 38 is prepared. When the tool main body is manually rotated while the hammer 22 is being stopped, the engaging pin 37 limits the relative rotation between the anvil 20 and the lock ring 38. The locked state between the anvil 20 and the lock ring 38 is released immediately when the rotation of the motor 4 is started.