Modular hand held arm with "Backsaver" grip attachment"

Device

Modular hand held arm with "Backsaver" grip attachment"

Description	Preliminary design page for Modular hand held arm with "Backsaver" grip attachment and "Leaf Claws"
Keywords	3D printing, modular arm, backsaver, leaf claw, yard work, gardening
Uses	development, industry, hobbyism
Authors	Karan Dhankani
Status	prototype
Made?	Yes
Replicated? Was this project made independently by someone other than the authors and without their guidance?	Yes
Countries of design	United States
Estimated cost	USD $ 5.00
Sustainable Development Goals	SDG08 Decent work and economic growth SDG03 Good health and well-being
Documentation data
Language	English
Manifest data
Language	English
Updated	2020-06-04
Author	Kathy Nativi
Author affiliation	Appropedia
Author email	info@appropedia.org

Modular hand held arm with "Backsaver" grip attachment"

Project developed by Karan Dhankani

This Open Source Appropriate Technology has been designed but not yet tested — use at your own risk.

This Open Source Appropriate Technology has been prototyped.

Abstract

With a modular setup, this device can be used as multiple tools in one. Main applications could be for people from third world countries where there is minimal automation. A shovel helper grip attachment could save a lot of effort by transferring some of the load from the user's back to the well gripped other hand. This in-turn results into lesser fatigue and more productivity.

Also, the Leaf Claws attachment can function as a big sized leaf collector hand or as even a shovel for damp yards. These type of attachments could also be used to reach certain areas (eg: for maintenance purposes in sanitation) where use of bare hands could have caused infections.

1. Picture of completed print using
   

Bill of Materials

1. 3 bolts: 5/16 inch diameter with approx 5 cm length: 38 cents x 3 = USD 1.14
2. 3 Nuts that fit into those bolts: 21 cents x 3 = USD 0.63
3. Hair band / Rubber band: Free?
4. PLA filament: Approx 50 x 3 grams = USD 3.2

The STL files and FreeCAD files for the parts can be found here:

Tools needed for fabrication of the OSAT

1. MOST Delta RepRap or similar RepRap 3-D printer

Skills and Knowledge Necessary to Make the OSAT

• Knowledge of FreeCAD and Cura

Technical Specifications and Assembly Instructions

- To Assemble: -

1. Download the part files provided above in the bill of materials
2. Convert stl files to gcode using software like Cura
3. Print all of the Parts
4. Attach a hair band / rubber band with the handle arm to make it a comfortable grip on the user's wrist
5. Connect the interlocking jaws of whichever tool you want to use
6. Secure with nut and bolt

- Time:

• Total print time estimate: 5 hours
• Total assembly time estimate: 3 minutes

Common Problems and Solutions

• One must be careful of your printer radius and calibration as a couple of those parts only just fit into my Delta: check how thw first couple of layers print and shrink the models if needed (all be same amount)
• Sticking to the bed could be a common problem in case of such large prints: Use high quantities of washable glue on bed before printing

Cost savings

1. Cost Estimate: USD 5 for two tools
2. Equivalent products in market cost: USD 33 (Backsaver grip: USD 13 and Leaf claw: USD 20)
3. Net savings achieved: USD 28

References

• The sources of information (e.g. engineering handbooks, journal articles, government documents, webpages, books, magazine articles etc.). References should use the <ref> </ref> and <references/> tags and can be in any format but should include all the information necessary for someone else to find the same information you did. For example:

[[Category:health care]] [[Category:Gardening]] [[Category:Farming]]