Why aren't all screws pozidrive?

[The Other Mike]

...in the UK and possibly in some bits of the old empire.

Have a look who invented Posidriv and in what country, the answer surprises many. It wasn't GKN, nor in the UK.

[Doctor Drivel]

Philips in the USA.

[charles]

but when someone has painted over the screw head, slotted screws can be cleaned out before undoing - not something that can be sone with either of the P types.

[Bob Eager]

That's only because you hacksaw a slot in them so that you can use your blunt penknife.

[Bob Eager]

Phillips.

[Alan]

Sacrificial screwdriver method used here. Heat up the end of the screwdriver in a flame then apply to slot or crosshead and the paint burns out.

[Alan]

In message , Brian Gaff wrote

Slotted screws are not easy to use when 'on site' you are using an electric screwdriver/drill to insert them.

[robgraham]

I'm lead to believe that that type of screw head has been in use across the pond since well before the war. We had a set of dining table chairs that were pre-war according to the family source, that had screws like that. The age was backed up by the fact that they were glued with hide glue. I had to make up a tool to take the screws out when maintenance was called for.

Rob

[NT]

:

Just use a pin to get most of it out in one lump.

NT

[The Medway Handyman]

Screwdriver with a through tang, hammer - then impact driver.

[Doctor Drivel]

That's a frigging good idea.

[Lieutenant Scott]

WTF? How do they look any cheaper than straight ones?!? If I want fancy screwheads, I buy brass ones.

[John Rumm]

Alas many modern screws are case hardened, and so damn hard to cut a slot in... (small abrasive wheel in a dremmel style tool will do it though)

[Lieutenant Scott]

The fine threads I can understand - they move slower per turn, so presumably make a better contact.

But this has nothing to do with the shape of the head. I'd much prefer not to have my screwdriver slip off the screw and onto a live wire....

[Lieutenant Scott]

I just look at the angle of the screw and select the correct driver. You need good eyesight like me though.

I look forward to them becoming a third world country.

[Lieutenant Scott]

I've never found a screw which doesn't fit a pozi or philips driver well.

Millions of people are making pozis, I can't see there being a rights problem.

Anyway how did they manage to patent something which is not significantly different to a philips?

[Lieutenant Scott]

I like to use more power. Use an angle grinder VERY briefly.

[The Other Mike]

different to a philips?

Because it is radically different to a Phillips with different design objectives.

Read and understand the patents for each and then you will appreciate this.

[Lieutenant Scott]

different to a philips?

There's a tiny little fraction of a millimetre difference. It's a philips with the bug removed - the edges weren't straight enough.

Patents screw up the world.

[therustyone]

the subject of a "Fast Show" sketch, AIR

rusty