Ergonomic Hand Tool Holder Weight Distribution
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Solution Overview
Problem
Prolonged use of hand tools leads to user fatigue due to the weight and repetitive manipulation, which causes discomfort and strain on the wrist and fingers as the same muscles and joints bear the tool's weight.
Innovation Solution
Ergonomic hand tool holders that distribute the weight of the tool to the dorsal saddle area of the hand, featuring adjustable forefinger and thumb rest areas, a handgrip for a pistol grip, and a counterweight device to balance the load, allowing the arm to bear the weight while the wrist and fingers guide the tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hand tool is held in traditional manner with fingers and wrist bearing the weight, then the tool can be manipulated with direct control, but the user experiences fatigue and discomfort in the fingers and wrist
Solution Approach 1:
The holder includes a counterweight device with adjustable weights that can be attached to the tool to balance the combined weight of the holder and tool over the dorsal saddle area of the hand, reducing the strain on fingers and wrist by redistributing the load to the arm
Solution Approach 2:
The holder provides multiple hand rest areas (first hand rest area on the body, second hand rest area on the brace portion) that engage different regions of the hand (dorsal and palmar saddle areas), transforming the weight-bearing mechanism from finger/wrist-based to arm-based through dimensional redistribution of contact points
2Adaptability or versatility
If the holder structure is made complex with multiple rest areas and adjustable components, then it can accommodate different hand sizes and provide better ergonomics, but the device complexity increases
Solution Approach 1:
The holder includes an adjustable brace portion that can be positioned at different angles and distances from the body, allowing the second hand rest area to be customized for different hand sizes and user preferences, providing adaptability without requiring multiple fixed-configuration holders
Solution Approach 2:
The holder is divided into distinct functional components (body, brace portion, handgrip, counterweight device) that can be independently adjusted or configured, allowing each segment to be optimized for specific ergonomic functions while maintaining overall system manageability
Data Source
AI summary
An ergonomic hand tool holder that supports a tool for use, while being received comfortably in a user's hand in a natural resting angle relative to the wrist, defines forefinger and thumb rest areas on outwardly-facing surfaces of side regions of the holder body, and hand rest areas adapted to engage and rest against the “saddle” of a user's hand when the holder is held with the forefinger and thumb rest engaging the forefinger and thumb rest areas. The weight of the holder and its supported load is distributed to the dorsal saddle area of the user's hand, allowing the user's arm to bear the weight, while the user's wrist and fingers guide, rather than carry, the tool. An ergonomic system may also include a counterweight device adapted to move the combined weight the load toward the hand rest area engaging the dorsal saddle area.