. Railway mechanical engineer . s employing the reser\oir jacket system,except for the largest size, for which a closed jacket forcoimection to a pressure system is optional. In the reser\-oir jacket system both the cylinder barrel andhead are cooled, and tlie jacket is designed to hold sufficientwater to operate for a period of 10 hours with a single filling. RECEDING PIPE THRE.\DERS A new design of receding pipe threader has recently beendeveloped and placed on the market by the Greenfield Tapand Die Corporation. Greenfield, Mass. This tool is turnedon the pipe until the desired length of th
. Railway mechanical engineer . s employing the reser\oir jacket system,except for the largest size, for which a closed jacket forcoimection to a pressure system is optional. In the reser\-oir jacket system both the cylinder barrel andhead are cooled, and tlie jacket is designed to hold sufficientwater to operate for a period of 10 hours with a single filling. RECEDING PIPE THRE.\DERS A new design of receding pipe threader has recently beendeveloped and placed on the market by the Greenfield Tapand Die Corporation. Greenfield, Mass. This tool is turnedon the pipe until the desired length of thread is cut and canthen be pulled off without turning back. i\t the beginningof the operation the chasers cut a full depth thread, and asthe work progresses the levers supporting them graduallychange their position, permitting the chasers to recede untilthey have completely withdra«Ti from the pipe, thus allow-ing the threader to be pulled off without the loss of timethat would be required to unwind from tlie threads. A single. Pipe Threader the Dies of Which Automatically Recede to PermitRemoval Without Unscrewing turn of any one of three lugs, conveniently placed, disengagesthe lead screw so that the head may be lifted and returnedto its original position and the trigger reset to begin anothercut The chasers are narrow and travel parallel to the threadthey are cutting, thus reducing friction to a minimum. Theyare interchangeable and so made that in case of breakagea single chaser may be replaced and follow or track uni-formly with the rest of the set. They are also made in setsfor each pipe size and with either the Briggs or Whitivorththread. The lead nut is in three segments, which are self-cleaningso that dirt or chips cannot gather on the lead screw, andboth the lead screw and nut can be replaced without return-ing the tool to the factor}. Adjustment for cutting shallowor deep threads is easily made by means of the lock nuts andadjusting rods that project through the head
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
