Impact Tool Grip Housing Rotary Joint Damping
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Solution Overview
Problem
Existing impact tools fail to effectively dampen the impact force generated during striking operations, as they primarily focus on absorbing forces in the axial direction of the tool bit, neglecting the perpendicular direction, leading to insufficient vibration reduction and potential user discomfort.
Innovation Solution
The impact tool design incorporates a mechanism with a grip housing displaceably connected through an elastic member and rotatably connected through a rotary joint, where the rotary joint's center is positioned closer to the tool bit's leading end, allowing the tool to rotate around its center of gravity, effectively absorbing forces in both axial and perpendicular directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the grip housing is connected through only an elastic member, then the structure is simple, but the impact force in the perpendicular direction cannot be absorbed
Solution Approach 1:
The patent combines the elastic member and rotary joint into a unified connection mechanism between the grip housing and main-body housing. The elastic member handles axial direction force absorption while the rotary joint handles perpendicular direction rotation, and their combination allows the grip to absorb impact forces in both directions simultaneously, resolving the contradiction between structural simplicity and comprehensive impact absorption.
Solution Approach 2:
The connection mechanism between grip housing and main-body housing is designed to perform multiple functions: the elastic member absorbs axial compression forces, the rotary joint allows perpendicular rotation and absorbs lateral forces, and together they provide vibration damping and impact force absorption in multiple directions. This multi-functional design eliminates the need for separate damping mechanisms for each direction.
2Ease of manufacture
If the rotary joint center is positioned away from the tool bit leading end, then the structure is simpler to manufacture, but the impact force damping effectiveness is reduced
Solution Approach 1:
The patent optimizes the positional parameter of the rotary joint center relative to the tool bit leading end and the elastic member center. By positioning the rotary joint center closer to the tool bit leading end, the moment arm for perpendicular direction forces is increased, enhancing the rotary joint's ability to absorb impact forces. This parameter optimization balances manufacturability with improved impact damping performance.
3Strength
If the grip housing is rigidly connected to the main-body housing, then the structural strength is high, but the vibration and impact force are not damped
Solution Approach 1:
The patent replaces rigid connection with a dynamic connection mechanism consisting of the elastic member and rotary joint. The elastic member provides flexible connection that can deform under impact loads, while the rotary joint allows rotational movement to absorb lateral forces. This dynamic connection maintains sufficient structural strength while effectively damping vibrations and impact forces transmitted to the user's hand.
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 reduces impact forces in both directions, enhancing vibration damping and minimizing user discomfort by stabilizing the tool's rotation and reducing the burden on the user's arm during operation.
Implementation Method 1
a grip part relatively rotates to perform a vibration absorbing action and simultaneously absorb a displacement difference by the elastic body
Implementation Method 2
the other end portion of the grip housing is rotatably connected to the main-body housing through a rotary joint. A center of the rotary joint is disposed on a leading end side of the impact tool with respect to a center of the elastic member
Data Source
AI summary
An impact tool includes a mechanism part, a main-body housing and a grip housing. The mechanism part strikes a tool bit. The main-body housing holds the mechanism part therein. The grip housing is continuously provided to a rear portion of the main-body housing. One end portion of the grip housing is displaceably connected to the main-body housing through an elastic member, and the other end portion of the grip housing is rotatably connected to the main-body housing through a rotary joint. A center of the rotary joint is disposed on a leading end side of the impact tool with respect to a center of the elastic member, when viewed in a strike direction of the impact tool.