What Are These Tools And How Are They Used?

[JerseyHarold]

I've been going through my late father-in-law's tools (he was a master carpenter) and found these things.  The markings say 'rawl grip  patented'.  There is a chisel end for hitting and a drill bit on the opposite end.   I don't see how to change bits, or even if that's possible. What are they called and how are they used?

 

Thanks for the help.

 

Harold

[fourleaf]

I did a quick internet search for you and found this!

 

http://www.supertopo.com/climbing/thread.php?topic_id=225425&tn=0

 

 

Mountain Climbing back in the day maybe

Edited July 18, 2013 by fourleaf

[Frank Elder]

Early cement drills....?

[Alshere59]

Early cement drills....?

That was my thought as well.

[Plymouthy Adams]

the original hammer drill....(powered by human effort, speed rated to one ability to sling hammer and accurately hit the anvil)

[JerseyHarold]

So you whack them to drill a hole in concrete or rock?   That would explain why the heads are mushroomed and splintered.   I'll take a power tool any day.

 

 

 

Fourleaf,

 

You did much better than me on a web search. I found next to nothing.

[Don Coatney]

Early (concrete, mortor, rock) hammer drills powered only by a hammer had a star shaped bit. I have several of these bits from my dads collection