Handheld Blower Handle Structure for Vibration and Maneuverability
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Solution Overview
Problem
Conventional handheld blowers with spring or anti-vibration rubber devices to reduce vibration increase weight and decrease maneuverability, leading to unstable direction control during operation.
Innovation Solution
A handheld blower design with flexible front and rear arms extending from the grip portion to the body, allowing reduced vibration transmission in the front-back direction while maintaining rigidity in perpendicular directions, thus enhancing maneuverability and reducing weight compared to devices with spring or rubber anti-vibration systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If spring or anti-vibration rubber devices are disposed between the body and the handle, then vibration transmitted to the operator is reduced, but the weight of the blower increases and maneuverability deteriorates
Solution Approach 1:
The handle arms are designed with anisotropic flexibility parameters, being more flexible in the front-back direction (vibration direction) than in perpendicular directions. This parameter change allows vibration reduction without adding heavy anti-vibration components, thus reducing weight while maintaining maneuverability.
Solution Approach 2:
The handle arms exhibit different mechanical properties in different directions: high flexibility in the front-back direction to absorb vibration, and high rigidity in perpendicular directions to maintain control stability. This local quality differentiation resolves the contradiction between vibration reduction and maneuverability.
2Object-affected harmful factors
If spring or anti-vibration rubber devices are disposed between the body and the handle, then vibration transmitted to the operator is reduced, but the rigidity between handle and body is reduced causing unstable blowing direction
Solution Approach 1:
The handle arms are designed with direction-dependent mechanical properties: flexible in the front-back direction to reduce vibration transmission, and rigid in perpendicular directions to maintain stable blowing direction. This local quality differentiation simultaneously addresses both vibration reduction and stability requirements.
Solution Approach 2:
The handle arm structure exhibits asymmetric mechanical behavior with respect to different directions of force application. The arms are engineered to be more compliant along the front-back axis while maintaining stiffness in lateral and vertical directions, creating an asymmetric rigidity profile that resolves the contradiction.
3Object-affected harmful factors
If the front arm and rear arm are made more flexible in the front-back direction, then vibration in the front-back direction is reduced, but the weight of the handle increases
Solution Approach 1:
The handle arms utilize material or structural parameter changes to achieve direction-specific flexibility. By modifying the cross-sectional geometry or material properties, the arms become more flexible in the front-back direction without proportionally increasing weight, as the flexibility is localized to specific directional properties rather than overall mass increase.
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 design effectively reduces vibration in the front-back direction, improving operator comfort and maintaining proper maneuverability of the blower, with a significant reduction in equivalent vibration from 15.7 m/s2 to 7.1 m/s2, as per ISO 5349 standards, and preventing damage through strategic material density and coupling.
Implementation Method 1
a vibration in the front-back direction with respect to the operator is larger than those in directions (vertical (up-down) and lateral (left to right) directions) perpendicular to the front-back direction
Implementation Method 2
the front arm and the rear arm are more flexible in the front-back direction than in directions perpendicular to the front-back direction
Implementation Method 3
The front arm is pivotally coupled to the grip portion and integrally coupled to the body, and the rear arm is pivotally coupled to the grip portion and integrally coupled to the body
Data Source
AI summary
A handheld blower has a body including a combustion engine and a blower section driven by the combustion engine, and a handle coupled to the body. The blower section has an air outlet directed forward with respect to an operator. The handle has a grip portion extending in a front-back direction with respect to the operator, a front arm extending from a front portion of the grip portion to the body, and a rear arm extending from a rear portion of the grip portion to the body. The front arm and the rear arm are more flexible in the front-back direction than in directions perpendicular to the front-back direction.