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Help with Chicago Pneumatic "Corner Hammer" mini rivet gun

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Victor Bravo

Well-Known Member
Supporting Member
Joined
Jul 30, 2014
Messages
13,447
Location
KWHP, Los Angeles CA, USA
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
 
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