Handheld Machine Dual-Grip Switching Mechanism
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Solution Overview
Problem
Current handheld sanding and polishing machines are often designed for either one-hand or two-hand use but fail to adequately accommodate both modes, particularly on curved surfaces where agility is needed and on larger surfaces where sustained pressure is required, leading to static stress and limited operational flexibility.
Innovation Solution
A handheld machine design featuring a centrally positioned one-hand grip and a second ergonomic grip for two-hand use, with a pivoting mechanism that allows for easy switching between modes and protects the user from couplings and air streams, enabling efficient operation on both small and large surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the machine is designed for one-hand use with a centrally positioned grip, then agility and ease of turning on curved surfaces is improved, but the ability to maintain high sanding pressure on large surfaces deteriorates
Solution Approach 1:
The machine is designed with a dual-grip system where the first grip (centrally positioned) enables one-hand operation for curved surfaces, while the second grip (laterally positioned) enables two-hand operation for large surfaces. This universal design allows the same machine to fulfill multiple operational requirements without compromise.
2Force
If the machine is designed for two-hand use, then high sanding pressure on large surfaces is improved, but agility and ease of turning on curved surfaces deteriorates
Solution Approach 1:
The machine incorporates a dynamic grip configuration where the operator can switch between one-hand mode (using only the first grip for agility) and two-hand mode (using both grips for sustained pressure). This dynamic adaptability allows the operator to optimize the machine's handling characteristics according to the specific task requirements.
3Ease of operation
If the machine is adapted for either one-hand or two-hand use but not both, then operational simplicity is improved, but operational flexibility and adaptability deteriorates
Solution Approach 1:
The machine features a universal grip system with a first grip for one-hand operation and a second grip for two-hand operation, allowing the same machine to adapt to different working conditions, surface types, and operator preferences without compromising simplicity or flexibility.
4Area of stationary object
If the working space is narrow requiring one-hand operation, then access to confined areas is improved, but operator comfort and reduction of static stress deteriorates
Solution Approach 1:
The machine allows dynamic switching between one-hand and two-hand modes. When working in narrow spaces, the operator uses one-hand mode for access, and can switch to two-hand mode when moving to larger surfaces or when extended periods of operation require stress relief, thereby maintaining operator comfort across varying working conditions.
Data Source
AI summary
A handheld machine, comprising a first grip (106) for receiving a first hand of a user of the machine, a second grip (118) for receiving a second hand of the user of the machine, and at least one coupling (114) for connecting the handheld machine to a flexible line (116). The second grip (118) extends in its usage position over the coupling (114) but is displaceable from this position.