Auxiliary Handle Vibration Damping via Monolithic Bayonet Lock
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Solution Overview
Problem
Existing additional handles for hand-held machine tools face challenges in providing a simple and secure vibration-damped connection between the handle part and the fastening part, often resulting in complex and costly designs that are bulky and inefficient in damping vibrations effectively.
Innovation Solution
A one-piece design for the holding and securing sections that enclose a damping space on all sides, filled with a damping element, ensuring comprehensive damping and protection against external influences, with a bayonet-like connection for secure assembly and isotropic stiffness and damping behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple individual damping elements are arranged to support the handle in all spatial degrees of freedom, then vibration isolation is improved, but device complexity and installation space increase
Solution Approach 1:
Multiple individual damping elements are merged into a single monolithic damping element with an integrated internal structure. The damping element contains multiple damping chambers arranged to provide support in all spatial degrees of freedom, eliminating the need for multiple separate components while maintaining comprehensive vibration isolation.
Solution Approach 2:
The damping element features a nested internal structure where multiple damping chambers are arranged concentrically or in nested patterns. This allows the single damping element to provide multi-directional support similar to multiple individual elements, reducing component count while maintaining vibration isolation performance.
2Ease of manufacture
If the damping element is exposed without protection, then manufacturing simplicity is improved, but reliability deteriorates due to external influences and damage risk
Solution Approach 1:
The damping element is nested within the holding section and locking section assembly, which provides protective enclosure. The locking section engages with the holding section to create a sealed or protected environment for the damping element, shielding it from external influences while maintaining manufacturing efficiency.
Solution Approach 2:
The design incorporates protective features that cushion or protect the damping element from potential damage before external influences can cause harm. The engagement mechanism between holding and locking sections provides inherent protection against damage during operation and assembly.
3Reliability
If a locking mechanism and additional elements are added to prevent handle detachment, then reliability is improved, but device complexity and weight increase
Solution Approach 1:
The locking mechanism is merged with the holding and locking sections structure. The locking section integrates locking features directly into its design, eliminating the need for separate locking elements. The engagement between holding and locking sections provides both structural support and detachment prevention in a unified assembly.
Solution Approach 2:
The locking mechanism operates through the inherent engagement between the holding section and locking section. The design allows the sections to self-lock or maintain engagement through their geometric configuration, eliminating the need for additional active locking components or complex mechanisms.
4Reliability
If the damping element is completely utilized for damping effect, then vibration isolation is improved, but manufacturing complexity increases
Solution Approach 1:
The damping element is segmented into multiple internal damping chambers while remaining a single monolithic component. This internal segmentation allows complete utilization of the damping material for vibration isolation, with each chamber oriented to address specific vibration directions, while the external form remains simple for manufacturing.
Solution Approach 2:
The damping element's internal structure parameters are optimized to maximize damping effectiveness. By varying the configuration, size, and arrangement of internal damping chambers, the design achieves complete utilization of damping material while maintaining manufacturability through standard molding or fabrication processes.
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 design achieves a high load-bearing capacity with reduced manufacturing and assembly costs, providing improved handling and operational safety by ensuring the damping element is used in its entirety and preventing detachment even if damaged, resulting in a more compact and lightweight handle.
Implementation Method 1
a connection between a handle part and a mounting part via an elastic damping element
Implementation Method 2
Vibrations generated during operation are transmitted from the machine tool, particularly through the auxiliary handle, to the user's hand or arm. To reduce the vibration level experienced by the user
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
The handle has a gripping part (1) that is enclosed with a hand of a user, and a machine-sided mounting part (2), where the gripping part is connected with the mounting part by a flexible damping component (3) and is secured at the mounting part in a form-fit manner. A retaining section (4) encompasses a locking section (5) in a form-fit manner under formation of a damping space with all-side clearance, where the damping component partially fills the damping space. The locking section has two locking projections arranged at equal distance with each other in a circumferential direction.