Grab Handle Assembly with Cam Lock Mechanism for Vibration Control
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Solution Overview
Problem
Existing grab handle assemblies for vehicles are either non-adjustable, rattle during operation, difficult to adjust, or have limited adjustability, and may detach during adjustment, leading to instability and potential damage under rough conditions.
Innovation Solution
A grab handle assembly featuring a sleeve, insert, and locking member with a locking pin and adjustment mechanism that allows for infinite position adjustment without rattling, remains attached during use, and can withstand predetermined loads without permanent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If adjustable grab handles are provided, then passenger comfort and stability are improved, but tolerances between mating parts cause loose connection and rattling during operation
Solution Approach 1:
The locking member is designed to transition between locked and unlocked states dynamically. The cam surface creates a mechanical advantage that allows the locking member to securely engage with the adjustment mechanism, eliminating rattling while maintaining adjustability. The spring-loaded design enables the locking member to maintain constant contact pressure against the cam surface.
Solution Approach 2:
The locking force is adjusted by changing the position of the locking member along the cam surface. When the locking member is positioned deeper into the cam surface, the locking force increases, eliminating loose connections and rattling while preserving the ability to adjust to different positions.
2Ease of operation
If adjustable grab handles are provided, then passenger comfort is improved, but adjustment mechanisms may be separated and dropped during adjustment
Solution Approach 1:
The locking member is integrated with the handle assembly through the locking pin that extends through the sleeve. This integration ensures that the locking member cannot be separated or dropped during adjustment. The locking pin acts as a physical constraint that keeps the locking member attached to the handle assembly throughout the adjustment process.
3Ease of manufacture
If non-adjustably fixed grab handles are used, then manufacturing simplicity is maintained, but passenger comfort is reduced due to fixed position
Solution Approach 1:
The grab handle is divided into separate components: the handle itself, the adjustment mechanism with cam surface, and the locking member. This segmentation allows the handle to be manufactured using simple extrusion processes while the adjustment mechanism provides infinite position adjustability through the cam and locking member interaction.
4Adaptability or versatility
If adjustable grab handles are provided, then position flexibility is improved, but adjustment requires tools or excessive time to figure out
Solution Approach 1:
The locking member is designed to be manually operated without tools. The user simply pulls the locking member to disengage it from the cam surface, adjusts the handle to the desired position, and releases the locking member to engage with the cam surface. The spring-loaded design automatically maintains engagement pressure, making the adjustment process intuitive and tool-free.
Data Source
AI summary
A grab handle assembly for a vehicle includes a sleeve for attaching to the vehicle, an insert receivable in the sleeve, and a grab handle positioned on an end of the insert. A locking member is provided to adjustably fix a position of the grab handle with respect to the sleeve. The locking member includes a locking pin and a cam lock mechanism to hold the insert with respect to the sleeve. A rotation prevention surface may be provided on the locking pin to prevent the locking pin from rotating with respect to the sleeve and the insert. A locking force provided by the locking member may be preset.