What is this (Union Tool Co.)

StarCommander · Jun 20, 2019

A friend of mine purchased a small lot of tools which included of several different sizes of these (photo below). Based on the fact they were bundled with several small 2-6 in. rules I suspect that these are some sort of small fixture for a rule.

Can anyone provide any more information on what these are and their intended purpose

Limy Sami · Jun 20, 2019

Key seat clamps for a steel rule - like these 298 Key Seat Clamps (Pair)

Ray Behner · Jun 20, 2019

Clamp two to a straight edge and mark along a rod or pipe.

StarCommander · Jun 20, 2019

After doing a little research on these keyseat clamps it appears that the majority of them have the slot which accepts the steel rule machined into the flat side. This set has the slot machined into the tapered side. Is this just manufacturers preference? or are these designed for a more specific task?

Limy Sami · Jun 20, 2019

StarCommander said:
After doing a little research on these keyseat clamps it appears that the majority of them have the slot which accepts the steel rule machined into the flat side. This set has the slot machined into the tapered side. Is this just manufacturers preference? or are these designed for a more specific task?

So they accommodate a larger shaft without relying on just point contact of the tips.

Tyrone Shoelaces · Jun 21, 2019

Limy Sami said:
So they accommodate a larger shaft without relying on just point contact of the tips.

Sami I remember making my own set as an apprentice. Years later when I got a job as a marker out they came in very handy. I had a lot of large key ways to mark out so the rule clamps and a box square got used all the time.

Incidentally I had one of those scribers in the " Starrett " illustration but after a life time of scribing the point was substantially shorter than that one ! Even after only ever sharpening it on an emery stone.

Regards Tyrone.

Limy Sami · Jun 21, 2019

Tyrone Shoelaces said:
Incidentally I had one of those scribers in the " Starrett " illustration but after a life time of scribing the point was substantially shorter than that one ! Even after only ever sharpening it on an emery stone.

Regards Tyrone.

Over the years I've done the same with many Lambsfoot pocket knives, …………...and still occasionally on coming across a pensioner with a blade the size of a broken matchstick that never made the scrap bin, half - sorta ponder ''is there a bit more life in that?''

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