Stepped Rear Wiper Beam Arm Tool-Free Blade Service
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Solution Overview
Problem
Existing rear wiper systems for vehicles require complex and costly hinged connections between the wiper arm and mounting head, necessitating removal of the mounting head for blade replacement, which is inconvenient and prone to errors, and often requires additional tools.
Innovation Solution
A stepped-designed beam arm wiper assembly that locks into a mounting head, allowing disconnection for servicing without removing the head, featuring a hinged head cover for access and a retention clip system that enables tool-free blade replacement, eliminating the need for a hinged connection and additional tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a hinged connection is used between the wiper arm and mounting head to allow blade servicing, then the wiper blade can be serviced by rotating the arm away from the surface, but additional components are needed which increases component cost and complexity
Solution Approach 1:
The wiper arm is segmented into a mounting head portion and a blade support portion that can be independently separated. The mounting head remains attached to the vehicle while the blade support portion with the blade can be removed and replaced without affecting the mounting head, enabling easy blade servicing without complex hinged connections.
Solution Approach 2:
The blade support portion is extracted as a separate serviceable component from the mounting head. This allows the blade and its support structure to be removed and replaced independently while the mounting head remains permanently installed on the vehicle, eliminating the need for complex hinged mechanisms.
2Ease of repair
If a hinged connection is used between the wiper arm and mounting head, then the wiper blade can be serviced, but the system may lack a low profile and may be bulky due to the hinge mechanism
Solution Approach 1:
By segmenting the wiper arm into separate functional portions (mounting head and blade support), the design eliminates the need for a bulky hinged connection mechanism. The segmented structure allows for a more compact, low-profile configuration while maintaining serviceability through independent removal of the blade support portion.
3Ease of operation
If the mounting head cover is made removable to access the attachment nut, then the wiper arm can be removed for servicing, but the cover can be misplaced or omitted when reassembled
Solution Approach 1:
The cover is merged with the mounting head as an integral component that cannot be separated. This integration ensures the cover remains permanently attached to the mounting head, eliminating the risk of misplacement or omission during reassembly while still allowing access to the mounting nut through the cover's design features.
4Ease of repair
If the wiper arm is completely removed from the vehicle for blade replacement, then the blade can be serviced, but it requires removing the mounting head which is inconvenient and prone to errors
Solution Approach 1:
The wiper arm is segmented so that only the blade support portion needs to be removed for blade replacement, while the mounting head remains attached to the vehicle. This segmentation makes blade servicing convenient and error-free as the mounting head with its complex attachment features stays in place.
Solution Approach 2:
The blade support portion is extracted as a separate serviceable unit that can be removed and replaced independently. This extraction allows blade replacement without the need to remove the entire wiper arm assembly or the mounting head from the vehicle, making the service process simpler and less error-prone.
5Ease of repair
If an additional tool is required to remove the fastening nut, then the wiper arm can be removed for servicing, but it makes blade replacement less convenient
Solution Approach 1:
The fastening mechanism is extracted and integrated into the blade support portion rather than requiring removal of the entire wiper arm. This allows blade replacement to be performed by simply removing the blade support portion without needing additional tools to remove fastening nuts from the mounting head.
Data Source
AI summary
A stepped-designed beam arm wiper assembly has a beam arm that locks into a mounting head such that the beam arm can be disconnected from the mounting head for servicing a wiper blade attached to the beam arm. A head cover is attached to the mounting head via hinges on either side of the head cover which allow the head cover to open off the head on either pin hinges of the head, and can be pressed onto the head and retained on. The other end of the beam arm is inserted into an adapter which snaps onto a rear wiper blade coupler via lead-in hole and trunnion connection. The beam arm has an airfoil with a stepped design to match the head cover, adapter, and blade assembly stepped design.