Can anyone remember a certain type of fixing used for anchoring a threaded fixing into concrete slabs, popular around the seventies but cant find it anywhere.
On the Spit site are several different types of fixing but this particular fixing used a drill that had a threaded stud at the end instead of a chuck, the drills themselves were all silver metal (steel?) with a fat body which held the motor and a long thin neck with a plain bent stud handle that you pulled and pushed away from you as you drilled with a hammer action.
The anchor itself consisted of a threaded barrel that had serrated teeth at the end for cutting into the concrete, you screwed this onto the threaded stud of the drill and then using the handle in a backwards forwards motion you quickly cut a hole in the slab.
You then removed the anchor and allowed the dust to fall out then put a small wedge into the hole in the center of the serrated end and without using the handle this time you just used the hammer action of the drill to force the anchor and wedge together in the drilled hole and after a second or so you sharply snapped the drill to one side which snapped off the anchor flush with the slab or slightly inside, the snapped off ring of the anchor was removed from the drills stud.
The anchors came in several pre threaded sizes I remember 2BA was one
and then when metric came along 4mm and if i remember correct were phospher bronze?.
they were a very quick,strong,permanent and clean fixing once you learnt how to do them and actually a joy to use.
can anyone locate a picture of them as i have tried to find them without success, perhaps not produced anymore but a picture of them would be great.
On the Spit site are several different types of fixing but this particular fixing used a drill that had a threaded stud at the end instead of a chuck, the drills themselves were all silver metal (steel?) with a fat body which held the motor and a long thin neck with a plain bent stud handle that you pulled and pushed away from you as you drilled with a hammer action.
The anchor itself consisted of a threaded barrel that had serrated teeth at the end for cutting into the concrete, you screwed this onto the threaded stud of the drill and then using the handle in a backwards forwards motion you quickly cut a hole in the slab.
You then removed the anchor and allowed the dust to fall out then put a small wedge into the hole in the center of the serrated end and without using the handle this time you just used the hammer action of the drill to force the anchor and wedge together in the drilled hole and after a second or so you sharply snapped the drill to one side which snapped off the anchor flush with the slab or slightly inside, the snapped off ring of the anchor was removed from the drills stud.
The anchors came in several pre threaded sizes I remember 2BA was one
and then when metric came along 4mm and if i remember correct were phospher bronze?.
they were a very quick,strong,permanent and clean fixing once you learnt how to do them and actually a joy to use.
can anyone locate a picture of them as i have tried to find them without success, perhaps not produced anymore but a picture of them would be great.