Eccentric Mechanism Tilt-Avoidance Lever Coupling
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Solution Overview
Problem
Eccentric mechanisms used in cleaning devices, such as broom handles, often tilt sideways when switching between open and closed positions, causing damage and instability in the coupling action.
Innovation Solution
Incorporating a tilt-avoiding mechanism with protrusions and slits in the lever and tool head, along with an adjusting mechanism like a screw, to prevent sideways movement and ensure stable coupling between the tool handle and head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional eccentric mechanism is used to couple the tool handle with the tool head, then the coupling action is achieved, but the lever tilts sideways during operation causing instability and potential damage
Solution Approach 1:
The patent introduces a stabilizing member as an intermediary element between the lever and the tool head. This stabilizing member includes a stabilizing surface that contacts the tool head and works in conjunction with the arcuate pressing surface to prevent sideways tilting of the lever. The stabilizing member acts as a mediator that transfers and distributes forces to maintain lever stability during operation.
2Ease of operation
If the lever is designed to rotate between open and closed positions, then the coupling mechanism functions, but sideways movement occurs during position switching
Solution Approach 1:
The patent applies local quality by creating specific contact surfaces with particular geometries at critical locations. The arcuate pressing surface on the lever and the corresponding stabilizing surface on the stabilizing member are locally engineered to provide directional guidance. These localized features ensure that the lever moves only in the desired rotational arc without allowing sideways deviations during position switching.
3Force
If the lever presses against the tool head to provide coupling force, then the coupling strength is achieved, but the lever may tilt due to uneven force distribution
Solution Approach 1:
The patent addresses force distribution by introducing a dimensional aspect through the arcuate geometry of the pressing surface. Instead of a simple point or linear contact, the arcuate surface distributes the pressing force along a curved path. This dimensional change in the contact interface ensures more uniform force distribution and prevents tilting caused by uneven loading during the coupling action.
Data Source
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AI summary
An eccentric mechanism (106) for coupling a tool handle (104) with a tool head (102) is provided. The eccentric mechanism (106) includes a first pin member (200) which extends through an opening in the tool handle (104). The eccentric mechanism (106) includes a second pin member (202) coupled to the first pin member (200). The second pin member (202) is oriented at an angle to the first pin member (200). The eccentric mechanism (106) further includes a lever (204) rotatably coupled to the second pin member (202). The lever (204) is adapted to rotate between an open position and a closed position. The lever (204) includes at least one arcuate portion (206) which presses against the tool head (102) in the closed position. The eccentric mechanism (106) is characterized in that the eccentric mechanism (106) further includes a tilt-avoiding mechanism (208) associated with the lever (204).