Step Down Handle Mechanism for Ergonomic Hand Tools
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Solution Overview
Problem
Conventional hand tools, such as shovels and rakes, often provide an uncomfortable grip and strain the user's wrist and back due to the elongated handle configuration, leading to potential injuries from repetitive use.
Innovation Solution
A step down mechanism for hand tools that divides the traditional unitary shaft into upper and lower shafts, with a plate and tubes that allow for a more ergonomic handle attachment, reducing wrist extension and back strain by enabling a comfortable grip and improved posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional unitary elongated shaft is used in hand tools, then the tool structure is simple and easy to manufacture, but the user experiences wrist extension and back strain leading to discomfort and potential injury
Solution Approach 1:
The traditional unitary shaft is divided into two separate shafts: an upper shaft and a lower shaft. The upper shaft connects to the tool implement, while the lower shaft connects to the handle. This segmentation allows the handle to be positioned at a more ergonomic height, reducing wrist extension and back strain, while maintaining structural integrity through the connection mechanisms described in the patent
Solution Approach 2:
A connection mechanism serves as an intermediary element between the upper and lower shafts. This connection may include features such as a universal joint, ball joint, or other coupling mechanism that allows relative movement while maintaining structural integrity. The intermediary enables the handle to be positioned ergonomically while still transmitting force effectively to the tool implement
2Ease of operation
If the handle is positioned at standard height for structural simplicity, then manufacturing is easier, but the user must stoop or bend back to use the tool comfortably
Solution Approach 1:
By dividing the shaft into upper and lower segments, the handle can be positioned at an optimized height that eliminates the need for users to stoop or bend back. The lower shaft with its connection to the upper shaft allows the handle to be positioned at ergonomic height while maintaining ease of manufacture through modular assembly processes
3Reliability
If an elongated unitary shaft is used, then the tool has simple construction, but the user's wrist must be extended causing strain during repetitive use
Solution Approach 1:
The segmentation of the shaft into upper and lower portions allows the handle to be repositioned to a height that maintains a neutral wrist position during tool operation. This reduces strain on the wrist and hand during repetitive use, improving reliability by minimizing injury risk while the segmented construction remains relatively simple
Data Source
AI summary
A hand tool having a step down mechanism. The hand tool includes a step down mechanism having a plate with two opposing ends. The plate also has an upper surface and a lower surface. The step down mechanism has an upper tube located near the first end and projecting from the upper surface and a lower tube located near the second end and projecting from the lower surface. The hand tool also includes an upper shaft affixed to the upper tube and a lower shaft affixed to the lower tube. The lower shaft has a hand tool implement affixed to an end of the lower shaft. The upper tube is sized and shaped to receive and hold the upper shaft and the lower tube is sized and shaped to receive and hold the lower shaft. The step down mechanism may include a handle projecting upward from the upper tube.