Introduction: Extendo Hand



Sometimes wish I had an extendo hand to help me reach things that are just a little too far away. For instance, picking plums off of the trees around here in Santa Clara, they are usually just about 12 inches too far away for me.

This is totally ridiculous, I know, but here it is...





here's my boyfriend Greg picking plums with it:




Step 1: Stuff You Need

a wrist brace (you can find these at Safeway made by Ace bandages)
5 spring type door stoppers
some wood and some screws
5 large washers with holes big enough to fit your fingers through
some string
some eyelet screws to guide the string through
cable ties

Step 2: Attach the Fingers

attach the door stoppers to a small chunk of wood which will act sort of like the palm of the hand.

I tried a couple of different directions for the thumb, but straight up at 90 degrees seemed to be the best idea.



Step 3: Attach the Tendons

first tie the strings to the tip of the door stops underneath the rubber end caps.

then secure the string to the "knuckle" part of the door stopper with cable ties.

attach the eyelet screws to the wooden palm and guide the strings through them.

Step 4: Attach the Hand to the Arm Bone

attach the palm to a long stick of wood to be the arm with screws.

attach the wrist guard to the wood at the other end with screws also.

Step 5: Adjust the String Length

put your hand inside the wrist guard and tighten it down with the velcro straps. You may need to add some velcro to the backside of the wood for it to grab onto.

carefully connect the large washers to the tendon strings and align them so the inside holes just reach the tips of your fingers.

Step 6: Now Go and Grab Some Stuff!

We tried this out on the trees outside and it kind of works for reaching up really high to get plums.

The fingers aren't too strong though, they keep shifting to the sides a little. And it needs some padding under the knuckles and on the finger rings if you're going to use it a lot.



Comments

author
TBolt (author)2009-08-12

I will post some pictures soon, I made one that didnt quite work but I have a great Idea to modify it a little bit from your design.

author
TBolt (author)2009-08-11

Im making one righ now!

author
foobear (author)TBolt2009-08-11

cool, maybe share some pictures when you're done?

author
CarliPierce (author)2008-12-03

I like these videos they are really fun, makes me want one too.

author
pls (author)2008-11-25

Awesome!, it grabs just like a real hand :D! wraps around the item.

author
HardTymes (author)2008-10-09

Now I can go dumpster-Diving in style! At least it won't cost me $29.95! Thanx! I'd sure as hell like to try it out! Hard Tymes

author
minerug (author)2008-08-28

I'll spoil the mood by saying 'stick to XP'

author
baconfish (author)2008-06-30

Neato! I've been sort of planning on doing something like this myself (probably with a slightly larger model of my own hand), but with actual joints on each of the fingers + thumb. It'll be really complicated, but I'm thinking of using a system similar to the cables on bicycle brakes for flexing.

author
foobear (author)baconfish2008-07-02

Yes, my first thought was to use something called "aircraft cable" which is a very strong and thin stranded metal cable. I got some from OSH but then when I went to cut it, none of my wire cutters or other tools could make a pass through it. OSH was out of cable cutters, so I just went with string which worked out well enough.

author
minerug (author)foobear2008-07-21

OSH? Isn't that Occupational Saftey Hazard? (Im not being stupid, it's a serious question)

author
Nimphious (author)minerug2008-08-27

I think you're referring to OHS, Occupational Health and Safety, I don't think the hazards have an acronym, although yours is reasonable enough.

author
minerug (author)Nimphious2008-08-28

The reason I said OSH is because that's what the helth and saftey thingy-ma-bob of the government is called where I'm from (I could be confused though)

author
foobear (author)minerug2008-07-21

Oh, sorry, around here it stands for "Orchard Supply Hardware"

author
minerug (author)foobear2008-07-21

Np

author
hellstudios (author)baconfish2008-08-23

you should look up adam's bionic hand from myth busters..... you might find that interesting....

author
baconfish (author)hellstudios2008-08-24

Would you happen to have a Youtube link, by chance? I can't find anything, but given that it's Mythbusters I'm guessing that it's just a *bit* more expensive than I could reasonably afford :P

author
Nimphious (author)2008-08-27

In your next version or possibly as a revision to this version, if you plan to do either, you could add a simple pulley to the base to make the grip stronger with less effort required by the user. Since it's such a long base many pulleys could be used, although after two it might be a little ridiculous since you'd need your other arm to pull the strings far enough to fully contract the fingers. Your design is great, and the only thing I would do differently following this instructable, would be adding a string for the thumb, and some more wood at the base to allow your thumb to control it separately from the hands, allowing you to do things like shake hands and operate buttons.

author
PKM (author)2008-06-25

The twangy doorstops! I haven't seen those in ages...

This is a really cool idea, if you wanted some next-level freakyness you could put a glove on the hand- it might make fruit-picking better (less bruising) and would look distinctly weird. Then sew extensions onto your sleeves and frighten small children with it :D

hehehehe

author
foobear (author)PKM2008-06-25

I was trying to think of some sort of rubbery thing to put on the fingers to give them more gripping power. Like maybe those rubber fingers that they have at the office supply store that people used to use who handle a lot of paper.

author
hellstudios (author)foobear2008-08-24

or some rounded off hot melt glue.....

author
PKM (author)foobear2008-06-25

Rubber thimble? I would have thought the rubber doorstop things would have decent grip, but I suppose you could replace them with carved bits of eraser? The silver side of duct tape has fairly good grip...

author
orangesrhyme (author)PKM2008-06-25

I have the twangy doorstops in pretty much every room in my house. I used to kick them, but people got really mad at me. Probably cause it was at night... okay, in the morning. One in the morning, that is.

author
BorisTheSpider (author)PKM2008-06-25

Yeah, those cheapo cotton gloves with the rubber dot drips would be perfect.

author
Da_Fudge (author)2008-06-24

all of the video's say "we're sorry, this video is no longer available". Plz fix! I might try this.

author
hellstudios (author)Da_Fudge2008-08-23

that usually happens when your ping from your internet is to high, seeing as how if your running in mozilla it has sef timers for each page, if it takes longer than 20 seconds or so, it times the connection out and it doesn't display the page.

author
foobear (author)Da_Fudge2008-06-24

It's working for me. I'm using Windows Vista. Are you on mac or something? I dunno. Maybe youtube had a glitch, could you refresh the page or something? I dunno.

author
PizzaPlanet (author)foobear2008-07-15

I have a mac its working perfectly!!!!

author
skimboarder33 (author)foobear2008-06-27

go vista!!

author
Da_Fudge (author)skimboarder332008-06-28

I got vista too!!!

author
Da_Fudge (author)foobear2008-06-26

I dunno.

author
Da_Fudge (author)Da_Fudge2008-06-27

its O.K. got it working.

author
C14ROCK1710042 (author)2008-08-22

PINOY KA BA??

author
darkmuskrat (author)2008-06-24

Thats ingenious to use doorstops as fingers :P (I would probably just pull them and make that spring sound though :)

author
foobear (author)darkmuskrat2008-07-02

Yeah, I love that sound. I think an interesting musical instrument could possibly be concocted out of them as well.

author
fkuk (author)2008-06-25

the fingers look flimsy when you picked up the rose you didnt realy pick it up you managed to close the fingers and lift it up and the indext finger is bent

author
foobear (author)fkuk2008-06-25

Yes, it is pretty flimsy.

author
ehmbee (author)foobear2008-06-30

You can use bicycle or motorcycle chain as "fingers"-just MIG weld some "bones" every few links and let your "joints" bend freely to make the closest to real fingers you can get at home in your shop. Then you can spring load them to return to the open position. Or reverse the process so they close automatically. If you can't weld try JB weld or something-look for the old Mythbusters episodes-they've made robot hands for busting myths once or twice this way with motorcycle chain and they are SOLID.

author
foobear (author)ehmbee2008-06-30

interesting idea. I was thinking that spring steel would have been good for the springiness, just don't know where to get it really.

author
santy22 (author)2008-06-30

Holey youtubes batman!

author
rocksalt2342 (author)2008-06-28

you should try to make this colapsable.

author
foobear (author)rocksalt23422008-06-30

yah, that would be cool. Maybe if I had an old tripod leg instead of the wood, that could work. And then somehow the strings would have to be adjustable easily.

author
piper1234 (author)2008-06-29

maybe impractical but one step to the next generation improved ; )

author
handyScrapper (author)2008-06-29

good idea, but to be honest, its totally impractical in a number of ways.

author
gingernutsjonny (author)2008-06-28

yeah vista

author
emuman4evr (author)2008-06-28

lol vista fire fox ftw!

author
LinuxH4x0r (author)2008-06-28

Useful!

author
BartSimpson (author)2008-06-27

oh wait. you did mention the padding, sorry!

author
BartSimpson (author)2008-06-27

nice instructable! a suggestion i have, though is to pad the inside of the rings, so no one gerts hurt. sorry if i missed anyting, i just got back from a trippy video on youtube. it was nice. everything was breathing and there was some musoic to go with it.

author
codongolev (author)2008-06-27

cool! I love plums!

author
Bisquick the ninja (author)2008-06-27

Cool home made! You can get those thing off tv that probably work better and are cheaper than the time it takes to make one But still cool!

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