Tire pump

Can anyone shed some light on this pump--vintage, who made it, etc.? Is this an early Chevrolet tire pump--4 cyl. era? If not, is it aftermarket or come with other vehicles as part of a toolkit? It is two stage.

In a 1990's issue of the magazine (Generator & Distributor) published by the Vintage Chevrolet Club of America (VCCA) , there was a picture and description of a pump that looked exactly like this one--I think it said model 490, maybe Superior series, etc. But I don't recall exactly which issue. This question has also been to the VCCA chat. But I wanted to see what you all have to say.

The following is cast on the round circular pump top:

GOE A A STAPLEY. The GOE could be COE. The two A letters are on opposite sides of the circular top

It is 19 7/8 " tall from the base to the top of the handle; the handle is 7 1/2" long. It pumps well but the check valve leaks back.

Here are some pictures if the links work:

http://i819.photobucket.com/albums/zz112/36chev/tire_pump_1.jpg

http://i819.photobucket.com/albums/zz112/36chev/tire_pump_2.jpg

http://i819.photobucket.com/albums/zz112/36chev/tire_pump_4.jpg

Thanks!

Just wanted to bring this back to the top so see if any ideas. Thanks!

I wonder if the larger cylinder would be to supply a higher volume when high pressure effort would not be required, at which time a shuttle valve switches it over, since the effort required would be more at high pressure (given the same volume output)? That would be

the utter forerunner to the two stage air compressors of today, perhaps? pv=pv ah heck I think not wise to go there, because a simple little tire pump turns into a temperature related physics project, getting guys like Bernoulli, Torricelli, Pascal, et. al., involved, not to mention anatomical efficiencies and the caloric transfer of energy, also not to mention the mass of the liquid Mercury, and also the characteristcs of the atmosphere at the moment of fixing of that model T Ford flat! Yikes, I am recalling enough to be thouroghly stupid! If only I could post pictures to the forums!

Thanks for the reply. The purpose of the two cylinders was to make it easier to pump air into high pressure tires of the earlier cars. I'm not sure exactly how it works, but the effort is reduced to pump 60lbs or so of air compared to a single tube pump.

This has been sold--had been looking to sell and found a buyer. Thanks!

Larger cylinder charges the smaller, yes they were intended for high pressure tires, typically pre WW1. Real back breakers as the large cylinder compresses on the down stroke and smaller one on the up stroke.