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Subject: Re: Compressed air line delivery
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Date: 06/26/02 at 10:07 PM
Posted by: Ilmar Luik
In Reply to: Compressed air line delivery posted by tom b on 09/01/01 at 11:06 AM:
Consider wire rope style cable streched above and along the assembly line. On that cable rides a trolly like a cable car. One one end of the cable is rolled up comressed air hose which pays out as the trolly is pulled along the cable. To prevent air hose from sagging down as it is pulled out there is an arrangement of rings which circle both cable and air hose and are properly spaced by by a string havin one end connected to the holding fixture of air hose drum and the other to the trolly. Now the problem is that trolly is hard to pull as more hose is paid out from the air hose drum which is alsoarranged to pull in the hose when the operator stops pulling on the air hose which hangs from the trolly. Obviously a counter balance is needed. This is provided an electric motor driving a cable drum (basically electric winch.) The winch is located at the opposite end of the cable which supports the trolly. Switching of the winch is arranged as follows: From the drolly pivots about 1 ft.long arm loosely attached to is the airhose going to air tool. If the operator of the tool is exacly undernieath the the trolly pivoting arm hang straight down and both drive swithes are open the winch does not drive. If the operator walks toward the winch end of the overhead cable tha arm begins to pivot in the same direction causing the winch to come on and pull maor air hose from air hose drum until the drolly is again above the operator. If operator moves toward the air hose reel winch payout switch closes and airhose rolled into the drum until the drolly is again above the operator. All parts for the system can be purchased from the Grainger catalog.
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