Pantograph Wiper Blade Layout for Full Window Coverage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing windshield wiper systems for large vehicle windows, such as those on railway locomotives, fail to provide complete cleaning coverage, with central and peripheral areas often left unclean due to the limitations of single-arm and pantograph-type designs, and combinations of these systems risk collisions between blades.
Innovation Solution
A windshield wiper device featuring a pantograph-type arm with a secondary cleaning brush mounted on a pantograph-type mechanism, allowing it to pivot relative to the primary brush, ensuring complete coverage without collisions, using connecting pieces with pivot joints and a sliding pin to maintain offset positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single arm with a large cleaning brush is used, then the central area of the window is cleaned effectively, but the corner areas surrounding the central area remain uncleaned
Solution Approach 1:
The cleaning system is divided into multiple independent cleaning elements: a main cleaning brush for the central area and at least one secondary cleaning brush for corner areas. Each brush is mounted on separate arms that can be adjusted independently to cover specific zones, ensuring complete window coverage without relying on a single oversized brush.
2Productivity
If a pantograph-type arm with a fixed cleaning blade is used, then the sides of the window are cleaned, but the lower central area remains uncleaned
Solution Approach 1:
The pantograph arm is designed with adjustable parameters including the angle of the support piece relative to the rods, and the position of the cleaning blade on the support piece. This dynamic adjustability allows the cleaning blade to reach the lower central area of the window while maintaining effective cleaning of the side areas, eliminating the fixed limitation of conventional pantograph designs.
3Reliability
If a secondary wiper blade is positioned lower to prevent collision with the primary blade, then collision is avoided, but a section of the window between the brushes remains uncleaned
Solution Approach 1:
The system is configured in advance with the secondary cleaning brush positioned on an adjustable arm that can be set to an optimal location. The arm's length and angle are predetermined to allow the secondary brush to clean the lower central area without intersecting the path of the primary brush, preventing collision while maintaining complete coverage. This preliminary configuration eliminates the need for reactive positioning adjustments during operation.
4Device complexity
If the secondary cleaning brush is mounted on a fixed position on the pantograph arm, then the structure is simple, but the cleaning coverage is incomplete
Solution Approach 1:
The mounting structure for the secondary cleaning brush incorporates adjustable elements including the angle of the support piece, the position of the brush on the support piece, and the length of the pantograph arm segments. These dynamic parameters allow the secondary brush to be positioned precisely to cover the lower central area while maintaining a relatively simple overall structure that does not require complex mechanisms.
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The invention relates to a window wiper device (1, 20, 40, 100) comprising a pantographic arm (22) at the end of which a main wiper blade is attached. According to the invention, a secondary wiper blade (101) placed beneath the main wiper blade (32) is mounted on the pantographic arm (22) by means of a pantographic device that is intended to offset the secondary wiper blade (101) from the main wiper blade (32), such that the two wiper blades (32, 101) can perform their wiper functions continuously on the window (10).