Wiper Arm Assembly Force Adjusting Device
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Solution Overview
Problem
Conventional windscreen wiper systems cannot easily replace conventional wiper blades with flat wiper blades on vehicles with aerodynamic windshields without modifying the wiper arm or spring member, leading to increased costs and complexity.
Innovation Solution
A wiper arm assembly with a force adjusting device that includes an actuating member movably mounted on the wiper arm, allowing the spring end portion to be displaced between two positions to increase the biasing force for flat wiper blades, ensuring optimal contact without requiring replacement of the wiper arm or spring member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional wiper arm assembly is used with a conventional wiper blade, then the system works properly on aerodynamic windshields, but replacing the blade with a flat wiper blade requires modifying the wiper arm or spring member, increasing cost and complexity
Solution Approach 1:
The force adjusting device includes an actuating member that can be moved between a first position and a second position, dynamically changing the biasing force applied by the spring member to the wiper arm. This dynamic adjustment allows the same wiper arm assembly to accommodate both conventional and flat wiper blades without structural modifications
Solution Approach 2:
The invention changes the biasing force parameter by displacing the first spring end portion between a first spring position and a second spring position. This parameter change enables the system to adapt to different wiper blade types (conventional vs. flat) by adjusting the force applied, rather than requiring physical modifications to the wiper arm or spring member structure
2Force
If the biasing force is increased for flat wiper blades on aerodynamic windshields, then optimal contact is maintained, but the force must be adjustable to avoid blade sticking at low speeds
Solution Approach 1:
The force adjusting device provides dynamic control of the biasing force through the actuating member, which can be positioned to provide either a first biasing force or a second (higher) biasing force. This dynamic capability allows optimization for different operating conditions (high speed vs. low speed) and different blade types
Solution Approach 2:
The actuating member can be pre-positioned in the first or second position depending on the intended blade type before installation. This preliminary configuration ensures the correct biasing force is applied from the start, preventing operational issues such as blade sticking or lifting
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
Enables easy and cost-effective replacement of traditional wiper blades with flat wiper blades, maintaining optimal windscreen cleaning performance even on aerodynamic windshields without altering the wiper arm assembly.
Implementation Method 1
a spring member including a first spring end portion operatively connected to the wiper arm and a second spring end portion operatively connected to the mounting member, the spring member being configured to apply a biasing force to the wiper arm
Data Source
Figure 1~2
Figure 3~6
AI summary
The invention relates to wiper arm assembly (4) including a wiper arm (11) configured to support a wiper blade; a mounting member (9) configured to be secured to a wiper shaft (7); a spring member (14) including a first spring end portion (14.1) operatively connected to the wiper arm (11) and a second spring end portion (14.2) operatively connected to the mounting member (9); and a force adjusting device (15) configured to adjust the biasing force applied by the spring member (14) to the wiper arm (11). The force adjusting device (15) includes an actuating member to which is connected the first spring end portion (14.1), the actuating member being movably mounted on the wiper arm (11) between a first adjusting position and a second adjusting position, and being configured to displace the first spring end portion (14.1) between a first spring position in which the spring member (14) applies a first biasing force to the wiper arm (11) and a second spring position in which the spring member (14) applies a second biasing force to the wiper arm (11) which is higher than the first biasing force.