| Show the franklin Fran kii air compressor the chicago pneumatic tool company has issued a litle pamphlet descriptive of the franklin high speed air compressor type GH which reads as follows an efficient air compressor running at ai a high speed will yield a much greater output of compressed air than is given by a slower running less efficient compressor of equal weight and size the increase in actual volume of compresses com compressed presse d air de evered by the compressor here described is from sixty to ninety per cent greater than is delivered by those of ordinary types with ev equal ual volume air compressors as ordinarily constructed ted are limited to moderate running speeds this is chiefly due to three features of construction unsuitable air valves restricted air passages and inadequate water jacketing by giving special attention to these features we have developed an air cylinder which will permit a much higher speed than can be attained when using less careful ly constructed ted cylinders we have also been able to effect a considerable increase in efficiency and to eliminate the objectionable noise which is usually present even in compressors pres sors running at moderate speeds the advantages of any high speed compressor are briefly reduced first cost decreased floor space and less expensive foundation our high speed compressor has the further advantages of high efficiency quiet operation and economical maintenance the mechanically operated inlet valves are designed to give liberal openings for the entering air and also to reduce clearance space to an unusual extent this we have accomplished without resorting to the unsafe practice of allowing part of the valve to extend into the cylinder during a portion of its travel the form of the discharge valve permits lightness without sacrifice of strength to secure this no expense is spared in material or labor we thus attain the minimum of valve resistance and overcome noise of operation the large free ar passages in both in et and discharge chambers and the exceptionally ample and unobstructed water jackets are additional features which make for high efficiency and permit of high speed cylinder head joints are avoided by casting the cylinder head and half of cylinder barrel in one piece this makes but one joint necessary which being midway of the length of the cylinder sustains an air pressure of less than fifteen pounds per square inch in single stage compressors by the ordinary construction there are two ey cylinder inder joints each subjected to maximum air pressure and temperature moreover the gasket is complicated in outline and J 00 11 1 A must prevent leakage around every bolt as well as from inner and outer walls all compressor users are familiar with gasket troubles at these joints by our new construction st a single gasket of simple form is used gasket troubles are e imitated the use of the tie bars instead of cylinder head bolts makes possible the simple gasket construction above mentioned and permits of free and unobstructed circulation cu lation of jacket water which in other compressors is much impeded by numerous bolt bosses which pass through the water jacket space the convenience of the tie bar construction is evident when access to the piston is desired running parts are liberally proportioned and with the large flywheels fly wheels effective counterbalancing and rigid frame this compressor is remarkably free from vibration and will endure long and continuous 7 operation at full load ample cylinder lubrication bri cation is provided for all running parts are equipped with automatic oil or grease cups of liberal capacity requiring the minimum of attention crosshead and pin are oiled simply and effectively from a single sight feed cup these compressors are built for belt rope chain or gear drive as well as for ope operation raton by steam or gas cylinder our cut shows the compressor equipped with gas cylinder using either gas or gasoline as fuel the gas cylinder is of the two cycle type simp e in construction and reliable and efficient in operation this compressor is a complete independent power unit no dependence need be placed on steam boilers belts electric power nor any appliances not forming a part of the compressor unit such a machine is perfectly adapted for use where other sources of power are lacking or for operating independently of the main power As a portable compressor it fills every requirement the fuel cost is low and expert attendance unnecessary at the franklin air compressor is handled and kept in stock by the F C richmond machinery company of salt lake city |
