Power Tool Handle With Rear-Protruding Top Part
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Solution Overview
Problem
Existing portable power tools, such as impact drivers, often have handle designs that do not provide optimal grip comfort, leading to finger fatigue and instability during prolonged use, and may cause fingers to slide, affecting operability and workability.
Innovation Solution
The power tool features a handle part with a top surface protruding rearward from the center, forming a W-shaped mold pattern with U-shaped lines, allowing for improved grip alignment with the palm and preventing finger sliding, while the handle is molded with a combination of hard and soft synthetic resin layers for enhanced comfort and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle part is designed with a conventional shape, then the structure is simple and easy to manufacture, but the grip comfort is poor causing finger fatigue and sliding during prolonged use
Solution Approach 1:
The handle part incorporates a top part protruding rearward from the center, creating localized ergonomic features (convex portions) that align with the palm's concave portions. This local modification improves grip comfort without completely redesigning the entire handle structure, resolving the contradiction between comfort and simplicity.
Solution Approach 2:
The handle part features an asymmetric design with a top part that protrudes rearward from the center, creating unequal distribution of surface features. This asymmetry allows the convex portions to specifically align with the natural contours of the human palm, improving grip stability and reducing finger fatigue during prolonged operation.
2Ease of operation
If the handle part uses a single material layer, then the manufacturing process is simple, but the grip comfort and stability are insufficient during long operations
Solution Approach 1:
The housing is constructed using composite materials consisting of a hard layer (synthetic resin) and a soft layer (elastomer). The hard layer provides structural strength while the soft layer enhances grip comfort and stability. This composite structure resolves the contradiction between manufacturing simplicity and grip performance by integrating two materials with complementary properties.
Solution Approach 2:
The elastomer layer is applied specifically to the handle part where grip contact occurs, while the hard synthetic resin forms the main structural body. This localized application of different material properties optimizes grip comfort and stability exactly where needed, without unnecessarily complicating the manufacturing of the entire housing structure.
Data Source
AI summary
A power tool includes a housing including: a body part having a substantially cylindrical shape and extends in a front-rear direction; and a handle part connected to the body part. The body part includes: a driving source; a power transmission mechanism part configured to transmit a driving force of the driving source; and a tip tool holding part to which the driving force of the driving source is transmitted from the power transmission mechanism part. The handle part includes a switch. A top part protruding from a surface of the handle part is formed on a side surface of the handle part along a longitudinal direction of the handle part. At least a portion of the top part is arranged at a position deviating rearwards from a center of the handle part in the front-rear direction.