Half a croissant, on a plate, with a sign in front of it saying '50c'
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Theta-Tip Screw Driver

So that screwdrivers don't slip off slotted screws
  (+3, -1)
(+3, -1)
  [vote for,
against]

A screwdriver bit that looks like a circle with a slash through it (when looking up at the tip).

It could be a removable cylinder-like piece that grips the shaft of a regular screwdriver and provides a ring around the flat tip. It could probably be springloaded just a bit so that the ring adjusts and it could be used for flatheads and screws that are in counterbores.

When you look at the bottom of the screwdriver it looks something like the greek letter theta (upper case). A circle with a line through the middle.

The idea is that your screwdriver won't easily slip off the head of a slotted screw.

--- This is probably something I'll post and then in 5 min. someone will send me a link to it (although I've never seen one)--and then I'll realize it's been tried and failed before I half-baked it.

ShawnBob, Apr 10 2010

Bits of security. http://www.pjtool.c.../screwbits/3033.jpg
[2 fries shy of a happy meal, Apr 10 2010]

Self adjusting Screw Holder Bits http://www.bondhus....cts/bits/body64.htm
This image may make implementation easier to visualize. [jurist, Apr 10 2010]

magnetic screw driver with bits http://www.technolo...3198.htm?src=nextag
[xandram, Apr 12 2010]

Table of screw head types http://www.neatorama.com/tag/screw-head/
[hippo, Apr 12 2010]

[link]






       It's a good idea. The link is to similar types of bits.   

       Dissapointed there are no thetans involved. Guess I misread the title.
zeno, Apr 11 2010
  

       I love it - although the solution is less helpful at the hardest stage of the process i.e. during unscrewing, when the screw is screwed all the way in and the guide can't get around the screwhead - or during screwing in, when the screw is *nearly* in and additional turns are getting harder and harder to do, and the screw-head is nearly flush with the surface of the material being screwed. Apart from that [+]
zen_tom, Apr 12 2010
  

       the magnetic ones work great! [see link]
xandram, Apr 12 2010
  
      
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