GB1197009A - Lubricating System - Google Patents

Abstract

1,197,009. Lubricating. McCORD CORP. 16 May, 1968 [27 Sept., 1967], No. 23376/68. Heading F2A. A lubricating system comprises a number of metering units connected in series in a single lubricant supply line forming a closed loop, means for supplying lubricant under pressure through said supply line, each of said metering units having a series of valves each being provided with a bore and a piston located therein, passage means connecting the ends of each valve with the corresponding ends of the valve bore in the next valve in series and opened by shifting the pistons in one direction, one of the valves having the ends of the bore therein connected to the supply line to shift the piston therein in one direction thereby to effect sequential movement of the pistons in each metering unit, passage means interconnecting the valves for discharging lubricant from the ends of the bores in all except said one valve to respective points to be lubricated upon said sequential shifting of said pistons, a by-pass line leading from each end of the bore in the last valve in each series to said supply line, and a non-return valve in each of said by-pass lines for directing lubricant flow from said supply line sequentially through said metering units in a direction determined by the direction of flow through said supply line in said one direction sequentially through said metering units to effect one-half of a cycle of operation of said metering units, and means for reversing the flow through said supply line when the last metering unit has completed its one-half cycle of operation to effect operation of said units through the second half of a cycle of operative in reverse sequence. In use pressurized lubricant is supplied from a line 12 to a terminal 76 and through a passage 34 in a valve 22 to the left-hand end of a piston 24 located therein, the piston 24 is forced to the right and discharges the lubricant in the right-hand end of a bore 26 through a terminal 78 to another line 12. A piston 32 in a valve 21 is forced to the right by pressurized-lubricant passing through a passage 36 in the valve 22, a passage 86 and a passage 34, into a bore 30 of the valve 21. Lubricant is discharged from the righthand side of the bore 30, through passages 44 and 88 into a bore 26 of a valve 22. Lubricant then passes from the bore 26, through a passage 40 to an outlet terminal 68 which leads to one of the points to be lubricated. The piston 32 is moved to the right, the passage 36 is uncovered and lubricant passes from the bore 30 to the valve 20, via a passage 34. A piston 32 is moved to the right to discharge lubricant from the right-hand end of the bore 32, through a passage 44 of the valve 20 and a passage 42 of the valve 21 into the bore 30 of the valve 21 and from the bore therein through the passage 40 to an outer terminal 72 which leads to a second point to be lubricated. A by-pass line 92 connects the left end of the bore 30 of the valve 20 the terminal 78 and a non-return valve 94 is positioned in the by-pass line 92. A similar by-pass line 96 connects the right-hand end of the bore 30 of the valve 20 to the terminal 76 and a non-return valve 98 is positioned in the by-pass line 96. When the piston 32 of the valve 20 moves to the right, the passage 36 is uncovered, lubricant from the line 12 flows through the by-pass line 92, through the non-return valve 94 to the terminal 78 and on through the other line 12 to the next unit in the system. Each of the valves 20, 21 will have completed one-half of a cycle of operation. The next unit will also cycle through one-half a cycle of operation and a reversing-valve (not shown) reverses the direction of flow so that lubricant is supplied in a reverse sequence and the valves in each unit will discharge lubricant to other points to be lubricated.