US2895684A - Mist coolant dispenser - Google Patents

Description

July 21, 1959 J. HARR 2,895,684

7 MIST COQLANT DISPENSER Filed May 29, 1958 s Sheets-Sheet 1 July 21, 1959 J. HARR MIST coo'LANT DISPENSER,

Filed May 29. 1958 3 Sheets-Sheet 2 J. HARR MIST COOLANT DISPENSER 3 Sheets-Sheet 3' Filed Mai 29. 1958 States This invention deals with a dispenser for mist coolants used in drilling and other cutting operations on metals and similar materials. More specifically, it relates to a mist-withdrawal system employed in such dispenser.

When metals are drilled or subjected to similar operations involving the cutting of metal, the portion from which the metal is cut is generally subjected to a slow flow of light lubricating oil which also acts as a coolant. More recent installations employ a mist of oil in an air stream which not only reduces the amount of oil used on the working part, but also supplies a blast of air therewith to further facilitate the cooling action.

The present invention involves a dispenser for such a mist coolant and particularly, to a mist withdrawal system of extreme simplicity and ease of operation and requiring a minimum of maintenance.

The invention will be more readily understood by reference to the accompanying drawings in which Figure 1 presents a perspective view of a preferred embodiment of a dispenser of the present invention in assembled form ready for use. Figure 2 presents a cross-sectional side view of the valve block and oil inlet system, while Figure 3 shows a cross-sectional front view of the valve block. Figure 4 illustrates a side view of the valve end of the mist coolant discharge line. Figure 5 shows a side view partially in cross-section of the valve end of the mist coolant discharge line depicted in Figure 4, while Figure 6 illustrates a side view partially in cross-section, of the discharge end of the mist coolant discharge line. Figure 7 presents an end view of the valve end of the mist coolant discharge line shown in Figure 5. Figure 8 is a cross-sectional view along VIII-VIII of Figure 5, while Figure 9 is a cross-sectional view along IX--IX of Figure 6. Similar numerals refer to similar parts in the various views.

Referring again to the drawings, numeral 1 represents a container wherein coolant oil is poured thereinto through screen 2 located in the top of the container, which container may be mounted at holes 3 at or near the metal working machine to be used in conjunction therewith. Mounted within front wall 4 of this container by means of screws 5 is valve block 6 having two valves 7 and 8, serving as the discharge and air inlet valves, respectively. The mist coolant discharge line 9 has its valve end 38 (Figs. 4 and 5) connected at opening 10 of the block, and its discharge noozzle end 11 is hung on a rack 12 (Fig. 1) which may be fastened on to the container or at any other convenient location. Opening 13 in valve block 6 serves as the connection means with an air pressure line (now shown) which would supply the compressed air required for the discharge of the mist coolant.

As is apparent from Figures 2 and 3, valve block 6 is provided with threaded hole 15 disposed in lower face 16 of the block. Hole 15 is connected with threaded hole 17 in upper face 18 of the block by opening 19 which may be shut off completely or throttled by valve pin 20 of valve 7, since pin 20 is adapted to fit into block atent seat 21. Threadedv portion 22 of valve 7' rides in. threaded hole 17 and O-ring 23 serves to seal oil the threaded. joint to prevent leakage. Into lower threaded hole 15 is fitted oil inlet tube 24having a flared end 25 which seats against seat 26 in hole 15. Hollow screw 27 serves to keep end 25 of tube 24 seated at 26. Tube 24, which is preferably of nylon or other suitable plastic, is immersed in the oil in container 1 (Fig. 1), and end 28 may be provided with additional slit openings 28' to prevent clogging of the inlet end of tube 24.-

Discharge connection 10 of block 6 has drilled into its thread side, hole 35 which continues (as 33 in Fig.3) through block 6 and connects with the bottomv of threaded hole 34 in upper face 18 of the block. Threaded valve stem 31 of valve 8 is adapted to ride in this latter hole 34 and its seatable pin 30 is disposed to shut off or throttle the air entering hole 14 connecting with threaded air inlet opening 13. As is seen in Figure 3, hole 33 is made by drilling hole 33 through side face 36 of the block and hole 33' then is plugged by means of plug 33". It is therefore apparent that air may enter connection 13 and its flow into discharge connection 10 may be regulated by valve 8. Likewise, oil sucked in. through line 24 may have its flow into discharge opening 10 regulated by valve 7.

It will be noted from Figure 2 that discharge opening or connection 10 is connected with the bottom of valve opening 17 by-hole or channel 63 in a manner so that valve pin 20 of valve 7 may be screwed against seat 21 to enable the control of oil flowing out of channel or hole Mist coolant discharge line 37 (Fig. 4) has discharge connection end 38'fitting into connection 10 of the block. End 37 of "discharge line 9 comprises a small diameter inner tube 39 (Fig. 5), preferably made of nylon or other suitable material, disposed within heavy air pres-.

sure line or hose 40, which is generally of rubber. At the discharge connection or valve end 38 of discharge line 9 the end 41 of nylon tubing 39 (Figs. 5 and 7) has disposed within it, for about an inch or so, a length of smaller diameter rigid tubing 42 (of stainless steel or other suitable material) serving to insure against the collapsing of tubing end 41 by gasket pressure. Metal tube 43 is disposed to fit over tubing 39 and to provide an inner seat 44 against which gaskets 45 may be pressed when they are squeezed against seat 46 of connection 10. Space 47 between tubes 39 and 40 serves as the annular conduit for passage of air, and, when end 45 is seated in connection 10, air from inlet 13 may pass through channel 14, past valve seat 30 (when valve 8 is open), then through channel 33 and through opening 35 in the side of connection 10, which opening is outward of seat 45, so that the air may flow around tube 43 of end 38 and into hole 48 which leads into annular conduit space 47. Threaded nut 49 has screw collar 50 resting on shoulder 51 on metal tube 43 and thus enables screwing in of nut 49 into threaded hole 10 to effect the gasketed seat made by gasket 65 seating against face block 70 of the block, at which time gasket 45 is made to seat against inner surface 46 of connection 10.

The nozzle end 52 of discharge line end 37 is illustrated in Figures 6 and 9. It will be noted that the end 39 of nylon tubing 39 fits into an inner nozzle having a body 53 which has a non-circular periphery, such as a square periphery 53' (Fig. 9), but also having a circular closefitting inner periphery 53" into which tube end 39 is cemented so that air will not flow between 39' and 53" to any substantial degree. Outer periphery 53' of inner nozzle 53 may be triangular, grooved, or otherwise shaped to permit air to flow unimpededly through free space portions 54 and out through annular space 55 between inner nozzle tip 60 and outer noule 11 and through opening 57 of outer-nozzle.1 1. Heavy pressure tubing or hose 4.0 .is fitted.tightly.over corrugated end 5 8 Qf nozzle 11. When suction is caused by air flowing out through space 55 and out opening 57 of nozzle 11, oil isisucked in through inner. space:59 (Fig. 6) :of tubing 39 and out through tip 150.01? inner nozzle 53, whereupo n it mixes withthe-air stream and emerges through opening "57 of nozzle '11 ,in the-form of a fine spray, provided, of course, that valves 7 and .8 are open. "I'he amountof spray and the amount of oil in the,sp1- ay;depend upon the adjustments of valves 7 and 8.

When in operation, the end of ;a compressed air line is connected to blockopening 13 and discharge hose holding means 38 is screwed into block;opening so that gasket 65 (Figs. sand '4),makes,atight seatagainst front face 70 of block '6, and-air valve 8 is adjusted to permitthe desired amount of air to flow up channel 14, past valve seat 30, through channel 33, then through side hole 35 in outlet opening 10 -and1hole 48 in discharge hose holding means :38, and through annular space 47, through spaces 54 and 55 and out nozzle opening 57. Then coolant .valve 7 is adjusted for the desired amount of oil to be discharged in the form of a mist. This oil enters tube 24, flows through channel 19 then past valve pin 20, through channel 63, leading to outlet surface 46 against which gasket 45 is seated and into inner-space 59 of tubing 39 (via end 41), since gaskets .45 would .prevent the oil from entering annular space 47. This oil then passes through tip 60 of inner nozzle 53 where it meets the'air at 55 and issues in the form of a spray through outlet 57 of outer nozzle 11. Valves-7 and 8 are then adjusted for the type ofspray desired.

Iclaim:

1. In a mist coolant dispenser having a container for holding coolant to be misted, a valve block'having an oil control valve to which oil is fed and having an outlet through which the coolant is centrally discharged and an air inlet leading to an air control valve and having a channel connecting the discharge side of said air valve with said outlet, and a discharge hose connectable in .seal n rel i nt seidput et sa dh h in a s l diameter flexible tube disposed annularly therein, both hose and tube terminating in a nozzle mist discharge end, the improvement comprising a valve block outlet having an annularly disposed seating surface and means forming a side opening as a terminus for said channel, a discharge hose mounting circumscribing the other terminus of said tube and comprising a cylindrical hose holding means disposed around said other tube terminus and having one end adapted to hold one end of said hose, gasketing means disposed around said other tube terminus ahead of and seating against the other end of said hose holding means and constructed to seat in air sealing relation on saidblock outlet seating surface inward of said channel opening when the discharge hose is connected to the block, means forming an air opening in said hose holding means disposed outwardly of said g-aske'ting means and pneumatically conneetable with said channel opening providing air access from said air control valve to theannular space between said hose and tube, connecting means disposed over said hose holding means for connecting said hose holding means in air sealing relation to said block outlet, said nozzle mist discharge end of said tube having a non-circular periphery adapted to permit free air flow between said tube and said hose.

2. A mist coolant dispenser according to claim 1 in which the other said tube terminus has inserted in it a tight fitting short length of rigid tubing.

References Cited in the file of this patent UNITED STATES PATENTS 394,657 Melotte Dec. 18, 1888 590,128 Browning Sept. 14, 1897 1,160,703 Fleming Nov. 16, 1915 2,483,591 Nichols Oct. 4, 1949 2,667,236 Graves Jan. 26, 1954 2,850,323 Veres Sept. 2, 1958

Images