Squirrel! -- a mechanical dog head sculpture by Dave Johnson

Dave Johnson has done it again with this fascinating mechanical dog head. Check out the action of the on-demand attention button. It's like hand-cranked animatronics!

The dog's head is capable of movement in four directions including side-to-side, up and down, the jaw, and the ears. Each movement is conveyed via pushrod. The pushrods sit on contoured cams, which are driven by a set of gears.

From the video description:

This machine is yet another attempt to get random(ish) movement from a decidedly non-random hand crank. The 4 gear pairs that drive the cams have slightly different gear ratios, so it takes something like 100 turns of the crank before the whole sequence repeats. The ear and jaw movements are also dependent on the current yaw and pitch position, so the result is a semi-random mishmash of movement. When the Big Red Button (BRB) is pushed, it lowers the cams out of the way, and the head falls into Squirrel! position.

Johnson has very cleverly integrated a bellows on the front of the machine. The moving air serves to soften the motion of the head after the red button is released. That's a very nice subtlety that most people wouldn't notice. But watch again and imagine if that wasn't there.

Here is where you can see still photos of Dave Johnson's Squirrel!

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Classic acrobat toy driven by push button-action

Here's a nice version of a classic wooden folk toy. An acrobat figure is mounted by the hands to two twisted strings held between two upright bars. When the button is pushed, the bars are separated, causing the strings to untwist. It's this untwisting motion that makes the acrobat perform speedy somersaults. Unlike the more traditional version where you use your hand to squeeze the bars, the version shown in the video has been converted to operate via a large push-button. This clever adaptation of a classic toy is by Roberto Lou Ma, who was kind enough to share with us the plans for the ramp-walking robot and ramp-walking rhino.

For plans and instructions on how to make the traditional acrobat toy, I urge you check out the book Traditional Wooden Toys: Their History and How to Make Them. The book has sections on animated toys, balancing toys, climbing toys, wheeled toys, wooden dolls, rubber-band powered toys, spinning toys, optical toys, games, and many others.

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Spirit USA mechanical metal toy

I don't know a lot about it, but here is a nicely retro metal mechanical toy -- part of a new line.

From Glenn Barr's blog:

The prototype by Jamie Mathis is looking fabulous! The soon to be released SPIRIT USA metal/articulated toy will be very chic and mechanically sound... The finish piece will have a nice bronze patina and several working parts.... fun to play with when feeling like you'd like to destroy the world.

Here is where you can see a full sized picture and/or order the Spirit USA metal toy.

[ Thanks deanS! ]

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