Impact Tool Dual Hammer Mode Switching Mechanism
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Solution Overview
Problem
Existing impact tools lack the ability to easily switch between hammering force and inertia force, limiting their usability in applications requiring variable torque and speed.
Innovation Solution
The impact tool incorporates a mechanism with a main hammer and a sub hammer, along with a weight ring, allowing for selectable hammering modes by linking or unlinking the hammers and adjusting the rotational speed of the motor, enabling easy switching between different force and speed settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed hammering mechanism with constant hammering force and inertia force is used, then the structure is simple, but the adaptability to different tasks is limited
Solution Approach 1:
The patent implements a dynamic hammering mechanism where the hammering force and inertia force can be switched between high and low stages through a mode switching member. This allows the tool to adapt to different tasks by dynamically adjusting its mechanical properties rather than being fixed, resolving the contradiction between adaptability and structural simplicity.
Solution Approach 2:
The hammering mechanism is segmented into a main hammer and a sub hammer that can be independently controlled. The sub hammer can be engaged or disengaged from the main hammer through the mode switching member, allowing selective activation of different hammering modes (impact mode and power impact mode) to suit different task requirements.
2Ease of operation
If the hammering force and inertia force are made switchable in high-low two stages, then the usability is improved, but the device complexity increases
Solution Approach 1:
The mode switching member serves multiple functions: it controls the engagement of the sub hammer with the main hammer, selects between impact mode and power impact mode, and adjusts the hammering force and inertia force. This multi-functionality improves usability without proportionally increasing complexity, as a single component achieves multiple operational adjustments.
Solution Approach 2:
The mode switching member acts as an intermediary mechanism that translates user input into mechanical adjustments of the hammering system. It mediates between the operator's needs and the mechanical components, providing easy switching between hammering modes through a simple operational interface.
3Force
If the sub hammer is integrally rotatable with the main hammer, then the inertia force increases, but the ease of switching between modes decreases
Solution Approach 1:
The rotational relationship between the main hammer and sub hammer is made dynamic through the mode switching member. In impact mode, the sub hammer is disengaged and does not rotate with the main hammer, providing lower inertia force. In power impact mode, the sub hammer is engaged and rotates integrally with the main hammer, increasing inertia force. This dynamic engagement allows easy switching between modes while adjusting inertia force as needed.
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 configuration allows for easy switching between hammering modes, enhancing usability by providing multiple operational modes with adjustable inertia force and rotational speed, improving the tool's capability to handle various tasks efficiently.
Implementation Method 1
a motor (4), a spindle (6), a hammer (60), an anvil (9)... The spindle (6) is configured to be rotated by driving of the motor (4). The hammer (60) is retained by the spindle (6). The anvil (9) is hammered in a rotation direction by the hammer (60).
Implementation Method 2
The main hammer (60A) hammers the anvil (9) by moving forward and rearward in an axial direction of the anvil (9) to engage/disengage with/from the anvil (9).
Implementation Method 3
The sub hammer (60B) is restricted from moving forward and rearward in the axial direction. The sub hammer (60B) is integrally linked to the main hammer (60A) in a rotation direction.
Implementation Method 4
The second hammer (75) may be a weight ring externally mounted on the sub hammer (60B) and slidable forward and rearward between a rear linkage position and a front non-linkage position.
Data Source
AI summary
An impact tool includes a motor, a first hammer, an anvil, and a second hammer. The first hammer is configured to be rotated by driving of the motor. The anvil is configured to be hammered in a rotation direction by the first hammer. The second hammer is configured to be switchable between a state being linked and a state not being linked to the first hammer. The impact tool ensures selections of a first hammering mode in which only the first hammer hammers the anvil and a second hammering mode in which the first hammer and the second hammer hammer the anvil.