Bulkhead-Mounted Pilot Seat With Stable Horizontal Adjustment
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Solution Overview
Problem
Aircraft seats, particularly in rotorcraft cockpits, lack the ability for horizontal adjustment, which limits their adaptability to accommodate different pilot sizes and poses a challenge in maintaining a stable vertical position during horizontal movement.
Innovation Solution
The design incorporates a bulkhead-mounted aircraft seat with independent horizontal and vertical adjustment capabilities, utilizing parallel rails, sliding members, a four-bar linkage, and a metering plate for energy attenuation, allowing for secure positioning and deceleration control during impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the seat is mounted directly to the bulkhead without horizontal adjustment mechanism, then the structure is simple and reliable, but the adaptability to different pilot sizes is limited
Solution Approach 1:
The seat mounting system is segmented into independent horizontal and vertical adjustment mechanisms. The horizontal adjustment allows the seat to move along the bulkhead while the vertical adjustment operates independently through the metering plate, enabling separate control of each degree of freedom and improving adaptability without excessive complexity
Solution Approach 2:
The invention adds a horizontal adjustment dimension to the traditionally vertical-only seat mounting system. By introducing rails that extend horizontally along the bulkhead and allowing the seat to translate along these rails, the system gains adaptability in the horizontal dimension while maintaining structural simplicity through the use of guide rails and sliding members
2Adaptability or versatility
If the seat allows horizontal translation along the bulkhead, then the horizontal adjustability is improved, but maintaining a stable vertical reference point becomes difficult
Solution Approach 1:
The adjustment system is divided into independent horizontal and vertical components. The horizontal translation along rails is decoupled from vertical positioning, which is managed separately by the metering plate with discrete height positions. This segmentation allows horizontal adjustability while maintaining vertical stability through independent control mechanisms
Solution Approach 2:
The four-bar linkage acts as an intermediary mechanism that couples the horizontal translation motion with vertical position maintenance. As the seat translates horizontally along the rails, the four-bar linkage ensures that the vertical reference point remains stable by coordinating the motion between the horizontal rails and the vertical metering plate positions
3Adaptability or versatility
If the seat is designed with both horizontal and vertical adjustment capabilities, then the adaptability is significantly improved, but the device complexity increases
Solution Approach 1:
The dual-adjustment system is segmented into independent horizontal rails with sliding members and vertical metering plate with locking pins. Each adjustment mechanism operates independently through simple, well-established mechanical principles, avoiding the need for complex integrated mechanisms while achieving full two-dimensional adjustability
Solution Approach 2:
The bulkhead-mounted rail system serves multiple functions: it provides horizontal translation guidance, supports vertical positioning through the metering plate, and enables both adjustment modes to operate independently. This multi-functionality reduces the need for separate dedicated mechanisms, thereby reducing overall complexity while maintaining full adjustability
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
Enables flexible horizontal and vertical adjustment of the seat, maintaining a stable vertical reference point and providing energy attenuation during impacts, thus enhancing pilot comfort and safety by accommodating various pilot sizes and ensuring secure seating.
Implementation Method 1
the metering plate is configured for energy attenuation via controlled deformation to control downward deceleration of the aircraft seat in response to an impact event
Implementation Method 2
A sled translates along the rails via paired sliding members set into the slots
Data Source
AI summary
A bulkhead-mounted aircraft seat assembly configured for independent vertical and horizontal adjustment includes an aircraft seat (seatback and seat frame/cushion) for supporting a pilot, passenger, or other occupant. Parallel rails attach to the bulkhead and extend along the bulkhead (vertically or near vertically) with opposing slots set into each rail. A sled translates along the rails via paired sliding members set into the slots, each pair of sliding members connected to an axle extending through the sled. A four-bar linkage attached to the sled and to the aircraft seat; the four-bar linkage extends from a default position to allow the aircraft seat to translate along a horizontal linear rail under the seat while maintaining a stable vertical reference point above the cabin floor. The seat is independently configured for substantially vertical adjustment via a metering plate attached to the bulkhead.