Tool Talk

Wrench Forum => Wrench Forum => Topic started by: bird on April 07, 2014, 08:01:27 PM

Title: mm ratchets
Post by: bird on April 07, 2014, 08:01:27 PM

Hi guys, I recently bought a bunch of tools from a guy around here.  This set was really interesting because they're metric. It reads  D.R.G.M and DRPa  any ideas about these???
(http://i996.photobucket.com/albums/af81/11numnum/BIRD-HP/Pictures/2014-03-20/th_mmratchets2640x480_zps4931f172.jpg) (http://s996.photobucket.com/user/11numnum/media/BIRD-HP/Pictures/2014-03-20/mmratchets2640x480_zps4931f172.jpg.html)

Title: Re: mm ratchets
Post by: rusty on April 07, 2014, 08:55:16 PM

DRGM is a German design registration (sort of like a patent) it changed to D.B.G.M after the war, so they are at least that old.

There should be a number after it....

DRP is a full actual patent
Unfortunatly, DRPa means "applied for", so you don't get a number...

Not easy to search these patents, especially with no date and no number :(

Title: Re: mm ratchets
Post by: bird on April 08, 2014, 12:51:45 PM

thanks to all!  I haven't seen these ratchets before...  are they very common?

Title: Re: mm ratchets
Post by: bonneyman on April 08, 2014, 04:52:25 PM

I've not seen metric ratcheting box ends old like those. I do have a set of old Dunlap's, but they are SAE.

I like them! Send them to me, and I'll give 'em a happy home!lol