Windshield Scraper Arm Brace for Wrist Fatigue Relief
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Solution Overview
Problem
Conventional windshield scrapers tire the wrist and hand quickly due to the need for maximal downward pressure to remove ice, limiting the duration and effectiveness of ice removal from vehicle windshields.
Innovation Solution
A windshield scraper with an arm brace that allows users to apply force using their arm muscles, reducing the twisting moment on the wrist and minimizing finger and hand exertion, enabling twice the downward pressure for a longer duration without muscle fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If maximal downward pressure is applied by the blade on the ice to improve scraping effectiveness, then the ice removal efficiency is improved, but the wrist and hand muscles become tired quickly
Solution Approach 1:
The invention transforms the scraping action from a wrist-dominated motion to an arm-dominated motion by adding the arm brace. The arm brace extends the leverage point from the wrist to the upper arm, allowing users to utilize larger muscle groups. This dimensional change in the mechanical leverage system enables sustained application of greater force without fatigue, directly resolving the contradiction between scraping effectiveness and duration of use.
Solution Approach 2:
The arm brace acts as an intermediary mechanical element between the user's arm and the scraper handle. It provides a new force transmission path that bypasses the limited wrist and hand muscles, allowing direct transmission of arm strength to the blade. This intermediary structure enables the user to apply maximal downward pressure sustained over long periods without fatiguing the smaller wrist and hand muscles.
2Device complexity
If conventional scraper design is used, then the structure is simple, but the wrist must bear the twisting moment which causes rapid fatigue
Solution Approach 1:
The arm brace adds a structural element that extends the scraper's mechanical leverage from the wrist level to the upper arm level. This dimensional extension creates a new force application axis that eliminates the twisting moment on the wrist, allowing the arm to provide stable downward pressure without the rotational stress that causes fatigue in conventional designs.
3Ease of operation
If fingers are used to apply downward pressure, then the scraper is easy to control, but the fingers and hand muscles tire quickly
Solution Approach 1:
The arm brace serves as an intermediary that transfers the force generation function from the fingers and hand to the upper arm muscles. The handle portion remains in the hand for positioning and control, while the arm brace provides the primary force transmission path from the arm. This division of labor allows fingers to maintain control with minimal force while the arm provides sustained power, resolving the contradiction between ease of control and duration of exertion.
Data Source
AI summary
A hand and arm manipulated scraper for a windshield comprising: a) a blade portion having a windshield contact edge portion and an opposite handle end; b) an elongate handle portion having a blade end portion, attached to the blade portion and an opposite grip end portion to be held with the hand; and, c) an arm brace portion terminating in an arm cover which covers a top side portion of the forearm extending therefrom down and the around the arm and having an inner end portion attaching to the grip end portion of the handle portion beneath the palm of one's hand. When the blade portion is pressed down on the windshield while the grip end portion is grasped beneath the palm of the hand, the wrist is prevented from bending up by downward pressure of the arm cover on the top side portion of the arm. In a preferred aspect of this invention the arm brace portion extends down and around opposite lateral sides of the arm so that when the blade portion is pressed down on the windshield the scraper does not tend to twist around the arm.