TMT - Toddler Mobility Trainer

Credits:
This product has been developed with the help of Go Baby Go Israel, Shenkar College students, TOM Israel Summer 2022 Interns, and the TOM Global R&D Team. Special thanks to Yara Hijaze from the Hasoub community for translating this document to make it even more accessible!

Applications and Impact:

The Toddler Mobility Trainer - Size Small - Rev 2.0 assists children aged 6 months to 3 years old who have difficulty moving independently. It provides a cost-effective solution for enhancing mobility in indoor environments, promoting independence and physical activity.

Project Details:

• Estimated Manufacturing Time: 
  • 4 Hours of machine time
  • 2 Hours of assembly
• Materials Needed: See BOM
• Technologies Used: CNC Machining, Laser Cutting, Sewing, 3D Printing.

Bill of Materials (BOM):

MAKE THE PARTS 

STEP #1 - CNC Wood instructions:

The following files are downloadable from the CNC folder in the download section.

*if you are using an outside CNC vendor, both files should be sent to ensure proper production: 

1. TMT 2_AllPartsCNC.dxf - DXF file to be sent to the CNC machine/vendor 

2. TMT 2_AllPartsCNC.pdf - (below) contains bit and toolpath information for proper CNC manufacturing.

STEP #2 - Cut All Foam + Fabric Parts

Cut cushion foam (BOM #22-23) and all cushion cover fabrics (#24-27, #31-33). 

*Optional - to be more precise, use a laser cutter*

STEP #3 - Prepare All Hook + Loop Pieces

Measure and cut all hook and loop pieces

STEP #4 - Cut straps

For the waist straps, prepare two 50mm wide, 550mm long waist straps (#3) and two 25mm wide, 400mm long foot straps (#9).

STEP #5 - Print side wheel covers

Print 10 Pieces of “Wheelcover V2” from PETG or similar material.

ASSEMBLY GUIDE

STEP #1 - Prepare cushion covers

STEP #1.1

Sew fabric belt loops (#26) onto Back cushion cover - back fabric (BOM #24) - Outside (face with color).

Sew hook and loop pieces to fabric as illustrated:

STEP #1.2

Sew back cushion cover - back fabric and -front fabric parts (BOM #24-25), and seat cushion cover - bottom fabric and -top fabric parts (BOM #24-25) to one another, leaving hook and loop areas free to insert foams. 

Sew 5mm offset from the outer shape.

STEP #1.3

Flip covers colored-side-out and insert back and seat foams (#22-#23) into fabric pouches. 

Thread back connection fabric (#27) through back fabric belt loops.

Place seat connection fabric (#33) inside the slit of the seat padding. Close the slits.

STEP #2.1 - Waist Strap

Sew the waist straps with the hook and loop pieces.

Note the difference between the hook and loop straps: → The direction of the double hem on the edge opposite the 75mm grip loops!

Waist strap (#3) - LOOP

Waist strap (#3) - HOOK

STEP #2.1 - Waist Strap

Make an approximately 8mm ‘plus (+)’ shaped cut 10mm in from the hem and use a lighter to secure edges.

Waist strap - LOOP

Waist strap - HOOK

STEP #2.3 - Prepare Foot Straps

For each foot strap - (#9):

STEP #4 - Prepare All Wood Parts

STEP #4.1 - Sanding

STEP #5 - Attach Waist Secure Straps

Fasten waist straps in place.

 1. With the engraving face up: Insert M6 barrel nuts (#6) through holes of the seat (#1B).

 2. Flip piece over so engraving is not visible. 

3. Place waist strap (#3) flush side down. 

4. Place M6 washer (#8) 5. Secure with M6 screw (#7)

STEP #6 Connecting the wheels

STEP #6.1 - Prepare Front Wheels

Set the footrest (BOM #1E) so all conic holes are facing up. Measure 30mm from side and 10 mm from bottom edges + mark.

Place small front wheels (#12) at the inside vertices and mark holes, as shown below

Using a 6mm drill bit, drill through where the wheels will be attached. Sand the wood so that no artifacts remain from the drilling.

STEP #6.2 - Mount Front Wheels

Set the footrest (BOM #1E) so the engraved letter E is facing down. 

Add M4 screw inserts (#14) into wheel holes. 

Tighten with allen key. Ensure insert top is level with wood.

Put small front wheels on holes with inserts. Fasten with 8 M4 screws (#15).

STEP #7 - Prepare Back Wheels

On base (BOM #1C) mark 10mm away from the rounded edge and mark centerline.

Place back wheel (#1) along the horizontal line and centered atop the vertical line, mark holes, as shown below:

Using a 8mm drill bit, drill holes where the wheel will be attached.

STEP #7.1 - Mount Back Wheel

Insert the M6 Barrel Nuts (BOM #6) into the 8mm drilled holes.

Flip the base (#1C) over so the engraved letter C is facing up. Place the Back Wheel atop the premade holes with the inserts now installed. Secure with 4 M6 screws (#7).

STEP #8 - Construct the Main Chair

IMPORTANT!

Make sure conic holes are on the outside of the chair (so screws securing the chair won’t stick out of the surfaces)! Relevant parts at this stage: back support (BOM #1A), footrest (#1E), and right/left side parts (#1F/#1G).

STEP #8.1

Connect the back support (#1A) and seat (#1B).

STEP #8.2

Connect base (#1C) and heel support (#1D).

STEP #8.3

Connect the back support (#1A) and seat (#1B) to the right side (#1F).

STEP #8.4

Connect base (#1C) and heel support (#1D) to the right side (#1F).

STEP #8.5

Connect the left side (#1G) parallel to right side onto the back support (#1A), seat (#1B), base (#1C), heel support (#1D), and footrest (#1E).

STEP #8.6

Connect the footrest (#1E) to the heel support (#1D) and right and left sides (#1F/#1G).

STEP #9

Use 2.5mm twist drill bit to drill pilot holes approximately 3mm deep through all conic holes [all parts with CNC-made holes aligning perpendicularly (90º) with other wood parts].

STEP #9.1

Screw 25 M4 20mm wood screws (BOM #2) into all pilot holes from the previous step. 

1. Through the right/left sides (#1F/#1G) into the back support (#1A), seat (#1B), base (#1C), heel support (#1D), and footrest (#1E). 

2. Through the back support (#1A) into the seat (#1B). 

3. Through the footrest (#1E) into heel support (#1D) and right/left sides (#1F/#1G).

STEP #10 - Attach Foot Straps

Attach foot straps (#9) through the oval holes in the footrest (#1E).

STEP #11 - Place cushions on chair

Place seat padding and thread seat connection fabric into the lower slots of the back support. 

Then place back padding and thread back connection fabric into the lower slots of the back support. 

Tie bows to secure paddings in place. 

STEP #11 - Place cushions on chair

Threat double sided hook and loop (#30) through side belt loops of back padding and slits on right and left wood sides. Close to secure in place.

STEP #12 - Attach Side Wheels To Chair

IMPORTANT! For safety!

Wheels need to be sufficient distance from wood so neither fingers nor forearms get caught between!

Connect both side wheels (BOM #16) to the right/ left sides (#1F/#1G) so the order of parts is as follows on the axle screw (#17) - from the outside of the chair to the inside:

 1. Head of the axle screw (#17) 

2. Side wheel (#16) - bearing indent 

3. M12 nut (#19) 

4. M12 washer (#18) 

5. Wood - right/left sides (#1F/#1G) 

6. M12 washer (#18) 

7. M12 nyloc nut (#20)

Thats It!

We encourage you to share your makes and remixes of the Card Holder to inspire others, improve the design, and showcase customizations!

For further documentation and to explore other open source assistive tech solutions you can visit tomglobal.org