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Hook Grasping
11 Replies

Started this discussion. Last reply by Wolf Schweitzer Apr 16.

 

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Thanks for sharing! One section of this paper that impacted me was the feedback from users that tried the different prototypes. I felt like I got some sense of the huge learning investment it takes for amputees to become adept at using a new devic...
November 24
Daniel Paulsen and Scott P Stack are now friends
August 2
Daniel Paulsen and Lys pham are now friends
April 25
As far as I know their is no electronic copy. I borrowed it from Harold Sears himself and I already gave it back. Also the copy I got was missing pages. When I get home I will try to find an image of his design.
April 21
I wear some silicon tube over the hook claws; the hook is designed to be used without them as well though. Also where could I get a copy of the Sears thesis? Did someone scan it, are the 138 pages electronically available? Thank you very much in a...
April 21
I agree that rubber inserts would be essential this design. I always meant to have them, only I didn't have time to model them. You have a very good eye for hook designs. In fact my hook shape was heavily influenced by the Harold Sears Hook, the ...
April 20
Daniel - That looks like great work. I have a couple of comments, and a question. I'd very much like to see some rubber inserts on the outsides of the hook, in order to allow stabilization of credit card receipts, etc. This is a constant annoyan...
April 19
Thanks for the feedback. You are not the only one that has liked the replacable fingers. One thing to consider is that I specifically designed this hook to target bilateral amutees, which is why I designed the adjustment to change without the use...
April 17

Profile Information

What has brought you to Open Prosthetics (check all that apply)?
Engineer
If an amputee, what type (not required)?
N/A
I'm interested in
Helping with projects, Getting help, Learning more

Daniel Paulsen's Blog

Daniel Paulsen

Phase 3: Design Phase

4-16-09

Phase 3: Design Phase

In phase 3 I modeled my ideas in SolidWorks analyzed my ideas in Microsoft Excel and then used my final model to make a rapid prototype. Here are the results of my many hours and late nights:


Continue

Posted on April 16, 2009 at 11:36pm — 6 Comments

Daniel Paulsen

Phase 2: Concept Development

4-14-09

It appears that my blog has fallen quite behind. I have already graduated and got my masters degree, but here is a retrospective update on what happened.

Phase 2: Concept Development

In phase 2 I compiled the information I obtained in phase 1 and came up with goals to shoot for with my design. Here are the goals that I came up with in no particular order:

1. Firm grip
2. Narrow well-mating tip
3. Efficient linkage
4. Multiple prehension patterns
5. Slender fingers for reaching into p… Continue

Posted on April 16, 2009 at 11:29pm —

Daniel Paulsen

A New Hook Design, Phase 1: Idea Collection

2/18/08

Phase 1: Idea Collection

Idea collection Phase is in full swing! Here are some of the hook ideas I have collected so far

1) Adjustable or Selectable Prehension. This is an old idea where the user can adjust the pinch force on a VC device. This would allow users to handle both heavy and delicate objects.

2) Detachable third finger. This would allow different modules to attach directly to the device such as a knife holder or different tools.

3) Non-preportional Spring Action. I… Continue

Posted on September 7, 2008 at 8:57pm — 5 Comments

Daniel Paulsen

A New Hook Design for the 21st Century: Introduction

The first post on blog entries is so awkward. Well, anyways, here is a little background about me: I am a Mechanical Engineering student at San Jose State who is working on my Masters Thesis project. When I was looking for a project I knew I wanted to work on a product that was challenging, and also helpful to people that are often overlooked. Then when I factored in my contacts at Hosmer Dorrance, it was a no-brainer to choose a prosthics project.

My main goals is to provide a prosthetic hook… Continue

Posted on February 18, 2008 at 8:00pm —

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At 9:05am on September 6, 2009, www.makemoneywith-google.com said…
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At 12:49pm on February 24, 2008, Sean McHugh said…
Hey Daniel, I'm always ready to chat about improvements to body powered systems. The design elements you mentioned all sound interesting, particularly the third finger/ attachment idea. Having a more modular device that could be quickly adapted to support tasks like holding a steak knife securely, riding a bicycle or motorcycle, or playing a guitar would be very helpful. As for aesthetics, I don't care what it looks like as long as its functional.
 
 

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