Help with Chicago Pneumatic "Corner Hammer" mini rivet gun

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Victor Bravo

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Jul 30, 2014
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My EAA chapter received a gift of several old boxes of aircraft related stuff. One of the tools included was a Chicago Pneumatic model CP 459 "Corner Hammer", which appears to be a mini tight quarters rivet gun. A standard .401 shank rivet set fits. There is no traditional retainer spring, and it has a button at the base of the grip instead of the typical trigger.

I hooked up an air hose and sure enough it works, but I could NOT for the life of me figure out how to adjust the speed or intensity of the blows. There was no regulator knob at the air inlet, nothing that looked like a speed or impact control.

Does anyone here have any experience with this gun? Can you tell me if, how, and where the adjustment is? Is this a 1X, 2X, or 3X equivalent? Are you supposed to use it without a retainer spring?

Here are photos I found online:

CP-459_l.jpg

Chicago_Pneumatic_CP_459_Corner_Air_Riveting_Hammer_Rivet_Gun_Aviation_Tool_02_fo.jpg

Chicago_Pneumatic_CP_459_Corner_Air_Riveting_Hammer_Rivet_Gun_Aviation_Tool_01_nad.jpg
 

gtae07

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Dec 13, 2012
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Savannah, Georgia
I think it's an air hammer or air chisel. Looks like a rivet gun, fits rivet sets, but as you note there is no "throttle" on it. I would not use it for riveting.
 
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A new tool to me as well. This site says it is good for rivets:


"rapid series of light blows" is opposite of what I was taught is the correct method?
 

TFF

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Apr 28, 2010
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Memphis, TN
One of those tools that was built for one job. Maybe if you are restoring a B-47 it’s THE tool. Goes in that nook that holds the wing on. With the power it’s probably designed to hit -8 rivets.
 

tailwind

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Mar 16, 2015
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KS
I've got one, it's a wild ride, rivet sets are special too, be careful it needs full throttle to hit hard enough to buck -4 and bigger rivets.
 
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