Roll Up Door Handle Mechanism for Single-Handed Operation
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Solution Overview
Problem
Existing roll up doors require simultaneous counterforces to open from inside the vehicle, which is ergonomically challenging and inefficient.
Innovation Solution
A door handle assembly with a pull strap block that redirects upward force to apply both downward and upward motions simultaneously, allowing single-handed operation to unlatch and open the door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional latching mechanism is used that requires simultaneous counterforces to open, then the door can be securely latched, but the operation becomes ergonomically challenging and requires two hands
Solution Approach 1:
A strap is introduced as an intermediary element between the user and the door handle. The strap allows the user to pull downward on the handle from above, translating a single-direction force into the necessary latching release action, thereby eliminating the need for simultaneous counterforces and enabling one-handed operation
Solution Approach 2:
The force application direction is inverted - instead of pushing upward on the handle from below (which would require counteracting the latch spring force), the user pulls downward on the handle from above. This inversion allows the user's body weight and natural pulling motion to assist rather than oppose the latching mechanism
2Strength
If the door handle assembly is designed for secure latching engagement, then the door remains firmly closed, but opening the door from inside requires complex simultaneous forces that reduce operational efficiency
Solution Approach 1:
The strap serves as a mechanical intermediary that transforms a simple single-direction pull into the complex force pattern needed to release the latch. This allows the strong latching engagement to be maintained while simplifying the opening operation to a single action, thereby improving operational efficiency without compromising security
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
Improves ergonomics by enabling single-handed operation to unlatch and lift the door, enhancing user convenience and efficiency.
Implementation Method 1
a guide portion extending between the side walls of the pull strap block and having a curved guide bottom surface, wherein the pull strap extends downward from the rear handle and wraps over the guide bottom surface, and then extends upwards through the gap towards the panel top portion, such that an upward force on the grip portion of the pull strap simultaneously provides both a downward force on the rear handle to actuate the front handlebar
Implementation Method 2
a rear handle interconnected with the front handlebar via a plurality of lever arms, the lever arms extending through slots in the panel
Data Source
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AI summary
A roll up door assembly (2) is provided that includes a roller (8) secured to both a roll up door (4) and a roll up door frame (6), and a door handle assembly (20) on the door (4) having a pull strap block (56) and a rear handle (48) interconnected with a front handlebar (40) via a plurality of lever arms (50). An end portion (82) of a pull strap (66) is secured to the rear handle (48), wherein the pull strap (66) extends downward from the rear handle (48) and wraps over a guide bottom surface of the pull strap block (56) and then upwards through a gap to a grip portion (80) of the pull strap (66), and wherein an upward force on the grip portion (80) simultaneously provides both a downward force on the rear handle (48) to actuate the front handlebar (40) to disengage the handlebar (40) from the frame (6), and to move the roll up door (4) upwards towards an open position.