Power Tool Handle Mounting Assembly Vibration Damping
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Solution Overview
Problem
Power tools, such as hammer drills, generate significant vibrations during operation, which are transferred to the handle and can cause discomfort and injury over time, necessitating a reduction in vibration transmission to the operator.
Innovation Solution
A mounting assembly for the rear handle of a hammer drill that includes a combination of a sliding upper mounting assembly with a helical spring and a pivoting lower mounting assembly, utilizing a metal rod and pin within a tubular sleeve and oval aperture, respectively, to absorb and dampen vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rear handle is rigidly attached to the body of the hammer drill, then the structural strength and stability are improved, but the vibration transmitted to the handle increases
Solution Approach 1:
The mounting assembly incorporates movable elements including a sliding mechanism with a rod moving within a tubular sleeve, and a pivoting mechanism with a pin moving within an oval aperture. These dynamic components allow the handle to move relative to the body, absorbing vibrations while maintaining structural integrity during operation.
Solution Approach 2:
The mounting assembly acts as an intermediary between the body and the rear handle. It includes intermediate components such as a rod, tubular sleeve, pin, and oval aperture that mediate the connection, allowing vibration absorption while maintaining structural strength.
2Object-affected harmful factors
If a vibration dampening mechanism is introduced between the body and the rear handle, then the vibration transmission is reduced, but the device complexity increases
Solution Approach 1:
The sliding and pivoting mounting mechanisms are combined into a single integrated mounting assembly. The rod within the tubular sleeve and the pin within the oval aperture work together to provide both sliding and pivoting movements, reducing the number of separate components needed.
Solution Approach 2:
The mounting assembly performs multiple functions simultaneously: it provides structural support, enables sliding movement for vibration absorption, allows pivoting movement for additional vibration dampening, and maintains a secure connection between the body and handle. This multi-functionality reduces the need for separate specialized components.
3Object-affected harmful factors
If the rear handle is moveably mounted on the body with sliding and pivoting mechanisms, then the vibration dampening is improved, but the ease of operation decreases
Solution Approach 1:
The mounting assembly incorporates movable elements including a sliding mechanism with a rod moving within a tubular sleeve, and a pivoting mechanism with a pin moving within an oval aperture. These dynamic components allow the handle to move relative to the body, absorbing vibrations while maintaining structural integrity during operation.
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
Effectively reduces the transmission of vibrations to the handle, providing improved operator comfort and safety by absorbing and damping vibrations in multiple directions, thereby minimizing the impact of tool operation on the user.
Implementation Method 1
a vibration dampening mechanism between the body and the rear handle... a sliding upper mounting assembly with a helical spring
Implementation Method 2
a metal rod and pin within a tubular sleeve and oval aperture, respectively, to absorb and dampen vibrations
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A power tool comprising: a housing (2); a handle (24) having two ends, the first end (30) being moveably mounted to the housing (2) via a first mounting assembly (34), the second end (32) being moveably mounted to the housing (2) via a second mounting assembly (36); a biasing mechanism (60) connected between the housing (2) and the handle (24); wherein at least one of the mounting assemblies (36, 34) comprises: a first part mounted on the housing (2) and a second part mounted on the one end (30, 32) of the handle (24), one part comprising a passageway (220), the other part comprising a rod (38), having a longitudinal axis, which is located in and capable of being axially slid within the passageway to enable the end (30, 32) of the handle (24) to move towards or away from the housing (2); at least part of the wall of the passageway (220) in a lengthwise direction of the passageway comprises a curved convex support surface (222; 228; 230) which is capably of engaging the side of the rod (38) to enable the rod (38) to pivot within the passageway (220) about an axis which is perpendicular to the axis of the rod (38).