Portable Hand Tool Roller Adjustment Mechanism
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Solution Overview
Problem
Existing portable hand tools for deforming sheet metal require cumbersome and time-consuming adjustments of rollers, making it ergonomically unsatisfactory and inefficient to adjust the location of the groove over a large distance.
Innovation Solution
Incorporation of a coupling device that allows the adjustment rod to be moved between engaged and disengaged positions, enabling the shafts and rollers to slide freely between adjustment positions, allowing for quick and easy repositioning of the rollers relative to the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adjustment device is rotated to move the internal threads relative to the external threads for adjusting the position of the rollers, then the position of the rollers can be adjusted between adjustment positions, but the adjustment requires several turns of the adjustment device which is ergonomically unsatisfactory and time consuming
Solution Approach 1:
The coupling device transitions between engaged and disengaged states, dynamically changing the mechanical connection between the adjustment device and the shafts. When disengaged, the shafts can slide freely for rapid repositioning; when engaged, the threaded connection provides secure locking. This dynamic state change enables both quick adjustment and stable positioning.
Solution Approach 2:
The adjustment mechanism is segmented into two independent functions: the coupling device for rapid engagement/disengagement and the threaded adjustment device for precise positioning. This segmentation allows the operator to quickly disengage the coupling device to move between adjustment positions without rotating the threaded mechanism multiple times, significantly reducing adjustment time.
2Adaptability or versatility
If the adjustment device is rotated several turns to move the rollers a relatively long distance between adjustment positions, then the desired positioning can be achieved, but the adjustment process becomes cumbersome and ergonomically unsatisfactory
Solution Approach 1:
The coupling device acts as an intermediary between the operator and the threaded adjustment mechanism. By engaging or disengaging this intermediate component, the operator can quickly reposition the shafts over large distances without manually rotating the threaded adjustment device multiple times, thereby simplifying the adjustment process while maintaining full adaptability.
Solution Approach 2:
The coupling device is designed to be engaged or disengaged before making adjustments. When disengaged in advance, it allows the shafts to be quickly positioned to the desired adjustment position without requiring gradual threaded rotation, enabling preliminary positioning followed by secure locking.
Data Source
AI summary
A portable hand tool includes a frame for guiding a sheet of material, e.g., sheet metal. A pair of shafts are spaced from each other and are selectively slideable relative to the frame to define a plurality of adjustment positions. A pair of rollers are respectively mounted to the shafts for deforming the sheet of material between the rollers. An adjustment rod is mounted to and extends outwardly from the frame. A support interconnects the shafts and an adjustment device is rotatably engaged with the support. A coupling device is disposed about the adjustment rod and is moveable between an engaged position and a disengaged position. In the engaged position, the coupling device couples the adjustment rod and the adjustment device to lock the shafts and rollers laterally relative to the frame. In the disengaged position, the shafts and rollers are slideable relative to the frame between the adjustment positions.