Rear Handle Mounting Assembly for 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 to the operator, especially during prolonged use.
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, along with a set of bellows, to absorb and dampen vibrations, reducing the transfer of vibrations to the handle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rear handle is rigidly mounted on the body, then the structural strength and stability are improved, but the vibration transmission to the handle increases
Solution Approach 1:
The mounting assembly incorporates movable elements including a sliding mechanism with a rod that can move along guide surfaces, and a pivoting lower mounting assembly that allows rotational movement. These dynamic components enable the handle to move relative to the body, absorbing vibrations while maintaining structural integrity through controlled motion rather than rigid connection.
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 with guide surfaces, a sleeve, and a pivoting mechanism that mediates the connection between the rigid body and the handle, allowing vibration isolation while maintaining structural strength through the intermediate mechanical elements.
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 mounting assembly is segmented into distinct functional components: an upper mounting assembly with sliding capability, a lower mounting assembly with pivoting capability, and intermediate elements like the rod and sleeve. This segmentation allows each component to perform a specific vibration-dampening function while maintaining overall simplicity through modular design.
Solution Approach 2:
The solution uses dynamic mounting mechanisms (sliding and pivoting) rather than static vibration dampeners. The rod slides along guide surfaces, and the lower assembly pivots, creating motion-based vibration isolation that achieves dampening through mechanical movement rather than complex damping materials or active control systems.
3Object-affected harmful factors
If the rear handle is moveably mounted to allow relative movement, then the vibration transmission is reduced, but the stability and precision of handle positioning deteriorates
Solution Approach 1:
The mounting assembly provides controlled dynamic movement through guided sliding and pivoting mechanisms. The rod moves along defined guide surfaces, and the lower assembly pivots around a fixed point, allowing vibration absorption through controlled motion while maintaining stable handle positioning through the constraints imposed by the guide surfaces and pivot points.
Solution Approach 2:
The guide surfaces for the rod include curved or arc-shaped features that constrain the rod's movement paths. The lower mounting assembly uses a pivoting mechanism with a defined rotation point. These curved and constrained geometric features ensure that while movement is allowed for vibration absorption, the handle maintains stable positioning within defined geometric boundaries.
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
The solution effectively reduces the transmission of vibrations to the handle, minimizing operator discomfort and the risk of injury by absorbing and damping vibrations in multiple directions, thereby enhancing user safety and comfort during extended use.
Implementation Method 1
a vibration dampening mechanism between the body and the rear handle to minimise the amount of vibration transferred to the rear handle from the body
Implementation Method 2
EP2415561 and EP2415562 both describe two embodiments of such a vibration dampening mechanism for a hammer drill
Implementation Method 3
the rear handle is connected via an upper mounting assembly, which enables the upper part of the handle to slide relative to the upper part of the housing, and a lower mounting assembly, which enables a pivoting movement of the lower part of the handle relative to the lower part of the housing
Data Source
AI summary
A power tool comprising: a housing; a handle having two ends, the first being moveably mounted to the housing via a first mounting assembly, the second being moveably mounted to the housing via a second mounting assembly; a biasing mechanism connected between the housing and handle; wherein at least one of the mounting assemblies comprises first and second parts, one being mounted on the housing and the other mounted on the one end of the handle, the first part comprising a passageway, the second comprising a mount and a rod, the rod having a first end and a shaft with a longitudinal axis, the first end being attached to the mount using a bayonet connection, the shaft being located in and capable of axially sliding within the passageway to enable the end of the handle to move towards or away from the housing.