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Part mechanical claw, part grappling hook. Let's design this together. Delrin - Stainless - Titanium
Part mechanical claw, part grappling hook. Let's design this together. Delrin - Stainless - Titanium
Part mechanical claw, part grappling hook. Let's design this together. Delrin - Stainless - Titanium
2,929 backers pledged $150,353 to help bring this project to life.

About this project

Gravity Hook: A high performance grappling hook. project video thumbnail
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Gravity Hook: A high performance grappling hook.

$150,353

2,929

Gravity Hook in 304 Stainless Steel. (Prototype #3) WE DID IT!!!
Gravity Hook in 304 Stainless Steel. (Prototype #3) WE DID IT!!!

 If you missed this project, Gravity Hook will be  available at www.fishbonefish.com after all backers have received their reward (early summer). 

 Gravity Hook Under Water!

                
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How strong is Gravity Hook? Click Play! (Don't try this at home folks.) You will get the most up-to-date design when the project closes. 

"Don't worry, my grappling hook will bite it."

LEFT: The evolving design thanks to Backer feedback. RIGHT: Where we started. (Check out updates. Looks like we've gone full circle.)
LEFT: The evolving design thanks to Backer feedback. RIGHT: Where we started. (Check out updates. Looks like we've gone full circle.)

UPDATE: All DELRIN, STAINLESS STEEL, AND TITANIUM rewards come with a Cross Hook. Thanks for making this happen!!! 

This is not your typical project. Your feedback adds to the design and function. It's coming to life because of your support. THANK YOU! 

We carry a lot of different things. Sometimes we drop them. Instead of leaving them out of reach, get your grappling hook! 

The Gravity Hook is a cross between a mechanical claw and grappling hook. When it touches down gravity pushes the jaws open. Lifting it closes the jaws around your prize. 

I've been working with the design and now I need your support to make it out of Stainless Steel. With your backing I'll fine tune, laser cut, finish, and get it shipped to your front door. Now we can laugh at all the quarters we've lost in claw machines!

Biting in the cross hook turns it into a 4 prong grappling hook.
Biting in the cross hook turns it into a 4 prong grappling hook.
Delrin Protoype #2 with gear tie Cross Hook and O-Ring grip.
Delrin Protoype #2 with gear tie Cross Hook and O-Ring grip.
The Cross Hook doubles as a gear tie when it's not a grappling hook! Shown in Delrin.
The Cross Hook doubles as a gear tie when it's not a grappling hook! Shown in Delrin.
Note: This design is evolving with backer feedback. You will receive the most updated version when the project closes.
Note: This design is evolving with backer feedback. You will receive the most updated version when the project closes.
This design is evolving with backer feedback. You will receive the most updated version when the project closes.
This design is evolving with backer feedback. You will receive the most updated version when the project closes.
This design is evolving with backer feedback. You will receive the most updated version when the project closes.
This design is evolving with backer feedback. You will receive the most updated version when the project closes.
Above image is 304 stainless steel for example purposes. This tier will ship in G2 Titanium.This design is evolving with backer feedback. You will receive the most updated version when the project closes.
Above image is 304 stainless steel for example purposes. This tier will ship in G2 Titanium.This design is evolving with backer feedback. You will receive the most updated version when the project closes.
Instead of creating multiple versions of rewards, if you would like paracord and a magnetic retriever for your Gravity Hook add $12 to your pledge.
Instead of creating multiple versions of rewards, if you would like paracord and a magnetic retriever for your Gravity Hook add $12 to your pledge.
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1st round of weight tests.
Stainless Steel Hardware. Prototype shown. You will get the most up-to-date design when the project closes.
Stainless Steel Hardware. Prototype shown. You will get the most up-to-date design when the project closes.
Biting in the Cross Hook turns the Gravity Hook into a 4 pronged grappling hook. (Delrin prototype)
Biting in the Cross Hook turns the Gravity Hook into a 4 pronged grappling hook. (Delrin prototype)

 What makes it high performance?

  • Can be used just as a 2 pronged hook. 
  • "Bites" objects that might slip out of a grapnel.
  • Installing the Cross Hook makes it a 4 pronged grappling hook.
  • Compact enough to be stowed on a back pack strap.
  • Can be dismantled for more compact storage. 
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Compact enough to stow on your back pack strap.
Compact enough to stow on your back pack strap.

 Why we need your support. 

We want to make this as awesome as possible. Some ideas I have in the works include: creating a magnetic attachment, designing a secondary purpose for the cross hook, and producing an extra large version. Each prototype has a cost and we'll go through a few before we're done. 

A complete assembly includes 3 links, 3 "hammers", a cross hook, and hardware. (Delrin prototype)
A complete assembly includes 3 links, 3 "hammers", a cross hook, and hardware. (Delrin prototype)
1.5" mouth when fully open.
1.5" mouth when fully open.

 Who we are.

Two years ago I created Fish Bone Knotless Gear Tie. Thanks to backer feedback, we (my brother Eldrick and I) went on to present other projects like Piranha, Neo Web, and Diesel Fish (see all our projects our profile). Since then we've learned more and more from our backers, perfect strangers, and everyone in between.Our passion is in making cool outdoor gear. 

The original prototype handmade out of bar aluminum.
The original prototype handmade out of bar aluminum.

The original prototype was made with basic hand tools. After that I took it to AutoCad and drew up a design.

Paper prototype # 4.
Paper prototype # 4.

There is more to it then you see at first glance. Since the parts interact with each other clearances have to be kept without losing function. Also, since the assembly is symmetrical, making curves flow with overlapping parts took time. With your support the stainless steel version will be cut with a 4000 watt laser and stone washed. I can't wait to show it to you.  

THANK YOU!   

Risks and challenges

Your opinion matters to us. There are design points we want to test and finalize. Right now this is where we're at. As this project moves along we’ll ask you what you think. We’ll take your input and make design changes to accommodate our backer’s general preference. That being said we won’t be able to please everyone 100% of the time. There won’t be any radical changes, but the final product may have modifications when all is said and done. Any changes are intended to improve what arrives at your doorstep.

This is our sixth project. We've learned a ton since. Material availability could be a challenge. The larger an order the longer the lead time can be. Another challenge is large scale manufacturing. If we get to the point where we need help fabricating, finding that help will take time. We've had experiences where folks tell us they can do a certain service but then find out it was past their capability. As of now this is what were expecting.

Production Timeline:
4 weeks: Funding.
2 weeks: Processing and Funds transfer.
4 weeks: Product development, manufacturing, and assembly.
2 weeks: Shipping.

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Support this project

  1. Select this reward

    Pledge $5 or more About $5

    SINGLE HOOK. Thanks for making this a reality. Check your mail box for a stainless steel hook. It's the same "Hammer" that makes up the Gravity Bite.

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    Pledge $20 or more About $20

    DELRIN. A Gravity Hook in 1/8" Black Delrin, a highly-crystalline polymer with high stiffness and strength. Includes 3 links, 3 hammers, and hardware. Approximate dimensions: L 5&1/4" X W 3/8" X H 2&1/2".

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    248 backers
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    Pledge $32 or more About $32

    STAINLESS STEEL. A Gravity Hook in 1/8" Stainless Steel. Includes 3 links, 3 hammers, and hardware. Approximate dimensions: L 5&1/4" X W 3/8" X H 2&1/2".

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    Pledge $50 or more About $50

    BOTH. Gravity Hooks in both 1/8" Black Delrin and 1/8” Stainless Steel. Includes 3 links, 3 hammers, 1 cross hook, and hardware for both versions. Approximate dimensions for each: L 5&1/4" X W 3/8" X H 2&1/2".

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    Pledge $52 or more About $52

    G2 TITANIUM. A Gravity Hook in 1/8" titanium. As strong as stainless but half the weight! Includes 3 links, 3 hammers, 1 cross hook, and hardware. Approximate dimensions: L 5&1/4" X W 3/8" X H 2&1/2".

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    Pledge $80 or more About $80

    TITANIUM + STAINLESS. Gravity Hooks in both 1/8" Stainless Steel and 1/8” Titanium. Includes 3 links, 3 hammers, 1 cross hook, and hardware for both versions. Approximate dimensions for each: L 5&1/4" X W 3/8" X H 2&1/2".

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    195 backers
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    Pledge $100 or more About $100

    TRIO. TITANIUM - STAINLESS - DELRIN. Gravity Hooks in 1/8" Stainless Steel, 1/8” Titanium AND, 1/8" Delrin. Includes 3 links, 3 hammers, 1 cross hook, and hardware for each version. Approximate dimensions for each: L 5&1/4" X W 3/8" X H 2&1/2". Batman costume not included.

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    198 backers
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Funding period

- (35 days)