Auxiliary Handle Vibration Damping via Elastic Element Placement
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Solution Overview
Problem
Current vibration damping auxiliary handles for hand-held power tools do not adequately reduce user discomfort and fatigue, as they fail to effectively mitigate vibrations transmitted from the tool body to the user's grip, especially in tools like grinders and hammer drills that exert pressing forces.
Innovation Solution
The auxiliary handle design features a grip mounted to the handle body via elastic elements at a predetermined region, preferably the middle, with spherical rubber elements allowing deformation in all directions, including shearing, and weights on either end to lower natural vibration frequency, thereby reducing vibration transmissibility and enhancing usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the grip is connected to the handle body via elastic elements at the proximal end (close to tool body), then the connection stability is improved, but the vibration transmission to the user's hand increases
Solution Approach 1:
The patent divides the grip into multiple regions (proximal end region, middle region, distal end region) and strategically places elastic elements at specific segments. By positioning elastic elements at the middle or distal region rather than the proximal end, the design segments the vibration transmission path, allowing the proximal end region to remain isolated from direct vibration sources while maintaining connection stability through proper elastic element placement.
Solution Approach 2:
The elastic elements serve as intermediary components between the handle body and the grip. By positioning these elastic intermediaries at the middle or distal region of the grip rather than at the proximal end, the design creates a vibration-isolated pathway where the elastic elements absorb and dampen vibrations before they can reach the user's hand, while still maintaining secure connection.
2Object-affected harmful factors
If elastic elements are positioned to maximize vibration reduction at the grip, then user comfort is improved, but the structural complexity increases
Solution Approach 1:
The patent applies local quality by making different regions of the grip serve different functions. The proximal end region is designed to be vibration-isolated for user comfort, while the middle or distal region contains the elastic elements for vibration reduction. This localized functional differentiation achieves effective vibration reduction without requiring complex structural modifications throughout the entire grip assembly.
Solution Approach 2:
The patent changes the positional parameter of the elastic elements from the proximal end to the middle or distal region of the grip. This parameter change optimizes the vibration reduction effect by placing the elastic intermediaries where they can most effectively isolate the user's hand from vibrations while maintaining a relatively simple overall structure.
3Object-affected harmful factors
If the elastic elements allow deformation in all directions including shearing, then the vibration proofing effect is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs dynamic deformation capabilities of the elastic elements, allowing them to deform in multiple directions including shearing motion. This dynamic flexibility enables the elastic elements to adapt to vibrations from various directions and frequencies, significantly enhancing the vibration proofing effect. The spherical shape of the elastic elements naturally accommodates multi-axial deformation without requiring complex manufacturing tolerances.
Solution Approach 2:
The patent uses elastic elements with composite material characteristics that provide both structural integrity and multi-directional deformation capability. These elastic elements, positioned at the middle or distal region of the grip, combine material properties that allow shearing and compressive deformation, achieving superior vibration damping while maintaining manufacturability through well-established elastic material technologies.
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 significantly reduces user discomfort and fatigue by minimizing vibration transmission to the user's grip, particularly effective for tools with non-constant vibration inputs, and provides a higher vibration reduction effect through shearing deformation, improving overall usability and comfort during operation.
Implementation Method 1
the elastic element may include a plurality of rubber balls and each of the rubber balls may be acted upon by shearing forces
Implementation Method 2
vibration proofing rubbers are disposed between the spherical surfaces of the handle body and the grip to form vibration-proofing elastic elements that exert a spring force against relative rotation of the grip
Implementation Method 3
a weight may preferably be provided on at least one of the closest side and the remotest side of the grip with respect to the tool body. By such arrangement of the weight, the natural vibration frequency of the grip is lowered, so that vibration can be alleviated
Implementation Method 4
vibration-proofing elastic elements that exert a spring force against relative rotation of the grip
Data Source
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AI summary
It is an object of the invention to improve vibration reduction of an auxiliary handle for a hand-held power tool. According to the invention, a representative elongate auxiliary handle 121 to be mounted to a tool body 103 of a power tool 101 includes a handle body 123 that is fixedly mounted to the tool body 103 and an elongate grip 125. The grip 125 has a grip region on its outer surface to be held by a user, and the grip 125 is mounted to the handle body 123 via elastic elements 133 in between a middle region of the grip region in its longitudinal direction and an end of the grip which is remote from the tool body 103.