Show THE LATEST THING IN HOISTS in 1858 Ericc Eric sons esons first air hoist was put into service in a new york warehouse and since that time man many improvements have been made in air hoist design td but never until the recent appearance of the hoist made by the denver rock kock drill manufacturing company has the rotary engine principle been embodied in a portable hoisting engine this new liew machine promises to add much to the fame of the well known line of mining machinery bearing 6 the waugh trade mark it is fully illustrated and described in a booklet just issued by the iho oin pany the acco aipa nying illustration i a general view of the compact little I 1 einach A a ch I 1 C 0 the hoists outstanding feature is its ell engine ille which is of the rota rotary ry re reciprocating cipro eating type and vibrates rates so little that the machine can be run free at high speed without willio ut being fixed to any foundation the splash system of lubrication in combination with a force feed to the main bearing is employed in the hoist and lubrication is greatly facilitated through the use of dissimilar metals in all bearing and friction surfaces A steady flow of power is maintained by the flywheel fly wheel action of the revolving spider within which the engine also revolves the machine delivers five horse bower power when shipped V n 71 from rom the factory and this horse power materially increases after ter installation tal lation no cylinder drainage is necessary be cause ause a dead cushion in the hoist cylinders is impossible the agars gear sare are cut from high 9 grade rade heat treated steel ml 11 n motion friction surfaces are ground to a precise size limit instead of being ig lapped together in the ordinary manner all ab calives being thus eliminated 1 rm clinder leakage is prevented by the use of piston rings the ie pistons pistons are extremely light and strong and made of 0 drop op forged he heat at treated hi high tl 9 grade steel accurately huncl and carefully balanced aft the gular gear equipment supplied with the 81 t has a ratio tio of to 1 but for light loads of 1000 f plied pi po fa or less gearing havivi having an 18 to 1 ratio can be supe horse hor the rhe whole wa cliine weighs pounds or 67 pounds per it will wil hoist to 2000 pounds vertically at kimn 9 air pressure at the rate of 68 to feet per of n depending wing upon the weight of the load and loads vial pounds at pressures as low as 20 pounds its drum iy ay carry 1000 feet of I 1 vi inch rope feet of inch rope 5 and feet of yo 12 inch rope its length is 2412 inches over all heights heigh th 1912 91 inches over all and width from center of linch l in inch column 17 ITs 1712 12 inches the utility of this new liew hoist is by no means limited to the mining 0 industry it is equally well suited to building contracting 0 excavating 1 foundry work grading lumbering quarrying ship yard work and many other ather fields where heavy loads are arc required to be lifted |