Angled Sliding Cab Door Track for Low-Effort Seal Engagement
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Solution Overview
Problem
Conventional walk-in delivery vehicles require significant energy and effort to open and close side sliding doors due to continuous frictional engagement of seals, leading to operator fatigue and potential injury.
Innovation Solution
A vehicle design featuring a cab door that travels along a linear axis oriented at an acute angle with respect to the vehicle's vertical plane, allowing the seals to contact the engagement surface only along a short portion of the door's path, reducing resistance and effort required for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the door travels along a conventional linear axis parallel to the vehicle's vertical plane, then the seal maintains continuous sliding engagement with the door throughout the entire opening/closing path, but this continuous engagement creates significant frictional force that requires excessive operator effort and energy
Solution Approach 1:
The patent changes the door's movement from a conventional linear path parallel to the vehicle's vertical plane to an angled linear path that forms an acute angle with the vertical plane. This dimensional change in the movement trajectory allows the seal to disengage from the door during most of the opening/closing travel, reducing frictional resistance while still achieving reliable sealing when the door is closed.
Solution Approach 2:
The patent segments the seal engagement into two distinct phases: a short portion where the seal contacts the door for sealing, and a long portion where the seal is disengaged during door movement. This segmentation is achieved through the angled track configuration, which separates the sealing function from the movement function, allowing the door to travel along an angled path while the seal only engages at specific positions.
2Reliability
If the seal is continuously engaged with the door during movement, then sealing is maintained, but the frictional force causes operator fatigue and potential injury
Solution Approach 1:
The patent extracts the seal engagement from the continuous door movement path, so that the seal is only engaged with the door during a short portion of the travel when the door is near the closed position. For the majority of the opening and closing path, the seal is disengaged from the door, eliminating the harmful frictional force that causes operator fatigue and potential injury.
3Ease of operation
If the door moves along an angled linear axis, then the seal contacts the engagement surface only along a short portion of the path, reducing friction and effort, but the door geometry and track configuration become more complex
Solution Approach 1:
The patent introduces an angled linear axis for door movement that forms an acute angle with the vehicle's vertical plane. This angular configuration, while geometrically different from conventional parallel arrangements, provides a straightforward mechanical solution that reduces seal engagement length and operational effort without requiring complex multi-component mechanisms.
Data Source
AI summary
A vehicle (e.g., a class-2 vehicle) with an improved cab door is disclosed. The vehicle can have a vertical plane that bisects the vehicle into a driver's side and an opposed side. The vehicle can comprise a chassis and a body supported by the chassis. The body can define a cab. The cab can define an opening configured to provide operator access to the cab. The cab door can be configured to travel about and between an open position and a closed position along a linear axis. In the closed position, the cab door can at least partially cover the opening of the cab. The linear axis can form an acute angle with the vertical plane that bisects the vehicle.