Vehicle Door Pull Handle Actuation Mechanism
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Solution Overview
Problem
Existing vehicle door pull handles for agricultural and construction machines lack functional reliability and efficient coupling with locks, often requiring complex mechanisms that are prone to wear and space constraints.
Innovation Solution
A pull handle design featuring a pivotable handle part connected to a bearing part with an integrated actuating mechanism and locking mechanism, utilizing a coupling sleeve and locking sleeve to decouple from the handle in the locked position, allowing for easy operation and reduced wear through linear movement of a coupling pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex actuating mechanism with direct connection to rotary latch lock is used, then the lock can be unlocked, but the mechanism is prone to wear and space constraints
Solution Approach 1:
The actuating mechanism is divided into separate functional components: the pull handle assembly, the actuating lever, and the locking bolt mechanism. This segmentation allows each component to perform its specific function independently, reducing overall complexity while maintaining reliability.
Solution Approach 2:
An actuating lever is introduced as an intermediary element between the pull handle and the locking bolt. The lever converts the linear pulling motion into rotational motion that can effectively actuate the locking mechanism, reducing wear on direct connection points.
2Ease of operation
If a pull handle with integrated locking mechanism is used, then the handle can be locked and unlocked, but the coupling to the lock requires efficient connection
Solution Approach 1:
Instead of having the handle directly drive the locking mechanism through complex linkages, the design inverts the approach by using a simple pivotable handle that actuates a lever, which in turn operates the lock. This simplifies the coupling while maintaining ease of operation.
Solution Approach 2:
The handle part is designed to be pivotable rather than fixed, allowing dynamic adjustment during operation. This dynamic design simplifies the coupling mechanism by accommodating movement naturally rather than requiring rigid, complex connections.
3Reliability
If the coupling pin is freely rotatable about the actuating axis, then wear is reduced and connection is easier, but the mechanism requires more space
Solution Approach 1:
The coupling pin is pre-configured with a conical surface that guides its insertion and initial rotation. This preliminary action ensures proper alignment and reduces wear during the coupling process without requiring excessive space for adjustment mechanisms.
Solution Approach 2:
The coupling pin uses a conical geometry parameter change to facilitate easy connection. The tapered shape allows the pin to self-align and rotate freely during insertion, reducing wear while minimizing the space required for the coupling operation.
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
Enhances operational reliability and reduces wear by allowing easy connection to external coupling elements, minimizing space requirements and ensuring smooth operation with a protected pivot pin.
Implementation Method 1
The pull handle also has a first compression spring which urges the coupling sleeve into its non-actuated position
Implementation Method 2
The locking sleeve also has a second compression spring which urges the locking sleeve into its uncoupled position
Implementation Method 3
The driver sleeve also has a torsion spring which rotates the driver sleeve back into its driver sleeve initial position after actuation
Data Source
Figure 1
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Figure 3
AI summary
A pull handle (1) to unlock a lock of a vehicle door or lift-gate having a pull handle housing (1a) with a bearing part (2) for securing on a vehicle door or lift-gate and a handle part (3) connected to the bearing part (2) rotatable around a rotation axis (170). The handle part (3) is rotatable by pulling from a non-activated to an activated position. An activation mechanism (4) mounted in the pull handle housing (1a) unlocks the lock, and can be activated by pulling on the handle part (3) and having a coupling element (56, 146) mounted in the pull handle housing (1a) to couple with external elements to unlock the lock. A locking mechanism (5) is located completely in the pull handle housing (1a) and the activation mechanism (4) can be disabled so that a pulling on the handle part (3) does not unlock the lock.