Lion Lock

by Gigi1970, published

Lion Lock by Gigi1970 Oct 15, 2017
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Lion Lock by Gigi1970 is licensed under the Creative Commons - Attribution license.

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For all parts except lock top, I recommend 100% infill for maximum strength.


Step 1: Spring Lever
Place the spring lever on the pin shown. The spring lever should move freely on the pin with minimal friction. If the spring lever moves stiffly or does not fit, clean the pin and hole with sand paper or file until a smooth fit is achieved. WARNING: any forceful twisting on the pin could make it break off.

Step 2: Tongue Placement
Before placing the tongue, rub it generously with bar soap on all sides to reduce friction. Place it in the slot with the end groove at the approximate location shown.

Step 3: Spring Placement
Place the spring as shown so that the top fits into the groove on the tongue, and the bottom is pushed down as far as possible into the groove without damaging it.

Step 4: Function Check
Push on the spring lever as shown and ensure that the beveled end of the tongue retracts as shown. When the spring lever is released, everything snaps back to the original position. If it does not, try rubbing more bar soap on the tongue, and possibly on the bottom of the spring lever.

Step 5: Shackle Placement
Place the shackle on the pin shown. The shackle should be able to twist freely on the pin. If there is excess friction, clean the pin and/or hole with sand paper or a file.
Step 6: Function Check
Twist the shackle into the closed position. It should snap into place, with the beveled end of the tongue locking it. Place the key on the pin below the spring lever and twist as shown. With the tongue retracted as shown, the shackle can be swung open. Lock and unlock several times to ensure there is no catching.

Step 7: Key fit check
Before putting the lock top on the lock, insert the key through the key hole to make sure it fits.
Step 8: Putting on the Lock Top
Install the lock top on the 4 pins shown. The pins should fit tightly, but if the fit is too tight, clean the pins with sandpaper or a file, being careful not to remove too much material.

Note: once the top is placed, it is difficult to remove without breaking the pins.

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Great design! Just what I was looking for. I wanted a old / vintage lock that works... I'll print it and post photos soon

Sadly every single of the pins that hold the top part, lock part etc break extremely easily.

Sorry to hear that! I plan to make the design more sturdy when I get time.

A couple of things helped make this go together really well:

  • I used wood filament for the parts but for the spring, PLA.
  • Printed the key flipped on its side with supports
  • The spring still needed help. I cut the negative contact spring out of a AA battery holder, crushed it laterally a bit with pliers, and it fits perfectly behind the spring to allow the lock to latch easily when the hasp is closed.
  • I used a dab of liquid silicone lubricant grease for the latch slide.
  • I drilled out the holes for the various pins, and superglued the cover onto the body once I was sure everything worked.

Great design! Thanks!

Here's a pic of an all PLA print with a spring added that I had on hand.

Thank you! Does the spring stay put?

One could add some bumpers in the model for such a spring to stay put.

Thanks--sorry you had to do all those things to it!

You don't happen to have a picture of what you did with the negative battery contact, do you? That sounds brilliant!

Comments deleted.
Comments deleted.

Very nice lock. Looking at the 3d files I don't really see how the mech works. Could you post an assembled STL? Perhaps without the lion lock top in place.

You say "as shown" are there more assembly pictures?

The pics are back now--hopefully they'll stick around. Thanks for the heads up!

Actually I had a bunch of pictures and now they're gone.... Let me see what I can do to get them back up there.

I can see them now as well. If you upload them as part of the thing's images they would get downloaded when someone does a "download all"
If you do that you might number them so they stay in order in a list.