When setting up Augmentative and Alternative Communication (AAC) devices, eye gaze systems, or tablets for wheelchair users, positioning is key. Frequently, what seems like a “device problem” is actually a mounting problem.
A poor mounting setup sags under weight, interferes with wheelchair handbrakes, or obstructs daily transfers. Conversely, the right mounting system maintains its position, allows rapid daily adjustments, and offers millimeter-precise repeatability to protect calibration and ergonomics.
Below is a detailed guide and comparison of the best adjustable mounting systems for assistive technology, focusing on the industry-standard Rehadapt 3D Series.
Key Takeaways
- The Heavyweight Champ: The Rehadapt M3D (22 mm tube throughout) minimizes vibration and prevents position drift for heavy eye-gaze systems positioned at long reaches.
- The Selection Rule: Match the mount series directly to device weight and reach distance:
- M3D: Best for eye-gaze systems and heavy dedicated AAC devices.
- H3D: Ideal for lighter devices (e.g., 10-inch tablets) where a more robust setup than the L3D is required, or where the mount may experience heavier daily use.
- L3D: Designed for lightweight devices and standard 10-inch tablets mounted close to the frame.
- Daily Ergonomics: Select mounting configurations based on user transfer styles and caregiver accessibility (e.g., Swing-Away or Fold-Down options).
- The Golden Standard (Repeatability): A top-tier mount must lock back into the exact same position every single time after removal, preserving carefully calibrated eye-gaze and touch targets.
- Virtual Fitting & Support: Tools like the Virtual Mounting System (VMS) and live setup assistance remove assembly intimidation and guesswork.
What Makes a Mounting System Truly “Adjustable”?
True adjustability in assistive technology hardware relies on a combination of multi-axis pivot control, clear separation between setup vs. daily adjustments, and strict positional repeatability.
1. Three Independent Pivot Points
A complete 3D mounting system relies on three core adjustment points:
- Frame Clamp: Connects securely to the wheelchair frame base.
- Tube Arm: Controls overall reach, height, and extension angle.
- Device Adapter (UDS): Adjusts final tilt, rotation, and fine angle positioning at the device connection point.
2. Setup Adjustment vs. Daily Adjustment
- Setup Adjustment: Performed once during installation by a clinician or technician to establish the baseline spatial configuration.
- Daily Adjustment: Features such as Rehadapt Quickshift allow caregivers or users to make frequent, tool-free positional tweaks or swing the mount away during transfers.
3. Why Repeatability Matters
Occupational Therapists (OTs) and Speech-Language Pathologists (SLPs) invest significant time determining the precise geometric location for a user’s communication device. If a mount is removed for transport or transfer, it must return to exactly the same position to prevent losing eye-gaze calibration or functional range of reach.
Rehadapt 3D Series Comparison (M3D vs. H3D vs. L3D)
A. M3D (22 mm Tube Throughout)
- Best For: Heavy devices and long-reach requirements.
- Typical Devices: All-in-one eye-gaze communication devices (e.g., Tobii Dynavox) positioned far from the wheelchair frame.
- Trade-Off: Heaviest system with the most prominent visual profile.
B. H3D (22 mm Base, 16 mm Upper)
- Best For: Mid-weight devices, moderate reach, or environments where the mount will be subjected to higher wear and tear.
- Typical Devices: Larger tablets and lighter dedicated AAC devices.
- Trade-Off: Provides an optimal balance between high holding strength and reduced physical bulk.
C. L3D (16 mm Tube Throughout)
- Best For: Lightweight devices and short reach close to the body.
- Typical Devices: Compact tablets and lightweight communication boards.
- Trade-Off: Can flex under heavier loads; the swing-away mechanism does not operate as smoothly as the heavier components in the H3D line.
D. Control Interface Mounts
The same 3D adjustability principles apply to mounting user control interfaces, including joysticks, head arrays, proximity sensors, and mechanical switches.
Quick Comparison Guide
| Series | Tube System | Best For | Typical Device | Trade-Off |
| M3D | 22 mm throughout | Heavy devices, long reach | All-in-one eye-gaze systems (e.g., Dynavox) | Heaviest, most visible |
| H3D | 22 mm base / 16 mm upper | Mid-weight, moderate reach | Larger tablets, lighter dedicated AAC | Balances strength & low bulk |
| L3D | 16 mm throughout | Lightweight devices, short reach | Lightweight tablets, small displays | Flexes under heavy loads |
Assembly & Selection Support
Overcoming Assembly Intimidation
Setting up multi-jointed mounting hardware can feel overwhelming. Utilizing resources like the Rehadapt Virtual Mounting System (VMS) or consulting with CS Mounting Systems,. you receive the exact clamp and tube configuration needed for specific wheelchair models.
Expert Fitting & Live Assistance
- Live Setup Support: Assistance options (such as live Zoom calls upon delivery) ensure proper assembly and orientation.
- Pre-Order Testing: Rehadapt’s VMS tool has completed over 20,000 successful virtual fittings, accurately mapping wheelchair geometry online so physical trial-and-error testing is rarely required
