Squeegee End Cap Cam Lock for Taut Blade Retention
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Solution Overview
Problem
Existing surface cleaning tools, such as squeegees, face challenges in maintaining the blade in a taut condition and preventing it from wandering within the channel, especially under difficult working conditions like high winds and extreme temperatures, which can lead to streaks and damage to surfaces.
Innovation Solution
The surface cleaning tool incorporates a handle assembly with a channel and end caps that have a movable portion and a clamping member with a cam surface, allowing for easy one-handed operation, even with gloves, to securely lock the blade in place and maintain tension, preventing axial movement and exposure of channel edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the blade is secured in the channel without end caps, then the device structure is simpler, but the blade cannot remain taut and may wander or move within the channel during use
Solution Approach 1:
The end cap is divided into a stationary portion (secured to the channel) and a movable portion (which moves to engage/disengage the blade), allowing the device to provide blade retention only when needed while maintaining structural simplicity
Solution Approach 2:
The end cap incorporates a movable portion that transitions between locked and unlocked positions, dynamically adjusting the blade retention state based on operational needs rather than being permanently fixed
2Reliability
If prior art solutions with components between blade and channel are used, then blade stability is improved, but ease of operation deteriorates under difficult working conditions
Solution Approach 1:
The cam surface automatically engages the clamping member when the movable portion is actuated, creating a self-securing mechanism that maintains blade retention without requiring additional manual intervention during operation
Solution Approach 2:
The cam surface acts as an intermediary mechanism that translates the movement of the movable portion into clamping force on the blade, providing reliable retention while requiring minimal operational effort
3Ease of operation
If the blade is allowed to move within the channel, then ease of installation is improved, but harmful factors increase due to exposed channel edges damaging surfaces
Solution Approach 1:
The end cap is pre-configured with the stationary portion secured to the channel and the movable portion positioned to engage the blade, preventing channel edge exposure and potential surface damage before the cleaning operation begins
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively keeps the blade taut, prevents streaks, and protects surfaces from damage by securely locking the blade within the channel, allowing for efficient cleaning in challenging conditions while maintaining ease of use.
Implementation Method 1
the cam surface resiliently flexes the clamping member to move the free end at least perpendicular to the longitudinal axis
Data Source
Figure 1
Figure 2~3
Figure 3A
AI summary
Surface cleaning tool (10), comprising a handle assembly (14), a channel (16) having a longitudinal axis (A), a wiper-blade (18) disposed in said channel (16) along said longitudinal axis (A), and a part of end caps (12), disposed at opposite ends of said channel (16). Each end cap (12) includes a stationary portion (21), a movable portion (22), and a clamping member (34,36). The movable portion (22) has a cam surface (38) and the clamping member (34,36) has a free end (44). The movable (22) and stationary portions (24) are interconnected so that the movable portion (22) moves between a locked position and an unlocked position. The cam surface (38) influences the clamping member (34,36) when the movable portion (22) is in the locked position such that the cam surface (38) resiliently flexes the clamping member (34,36) to move the free end (44) at least perpendicular to the longitudinal axis (A).