US1723544A - Lubricating pump - Google Patents

Description

H. ETZELT LUBRICATING PUMP Aug. 6, 1929.

3 Sheets-Sheet 6 Filed March 1927 V Patented Aug. 6, 1929.,

UNITED STATES PATENT oFF E;

HEINRICH E'JJZEL'JJ, OF DUSSELDORF, GERMANY.

LUBaIoATINe PUMP.

' Application filed March 9, 1927:; Serial No. 174,024.

This invention relates to lubricating pumps and more particularly to the type, in which the lubricating pump is mounted on the cover of a steam cylinder and is driven by a rodextending through the cylinder cover and alternately raised and lowered by the'reciprocating piston. V v i The present invention has fori'ts object to provide a lubricating pump of this kind, in which the stroke of the pump is capable of adjustment whilethe latter is in operation.

A further object of the invention is to provi'de such an apparatus having a plurality of separate pumps, by means of which appara tus a plurality of cylinders can be lubricated simultaneously, for instance the cylinders of the air pump of railway brakes, in which a high pressure and a low pressure steam cylinder and a high pressure and a low pressure air cylinder respectively are positionedopposite one another and the common piston rods reciprocating between these cylinders must be automatically lubricated. I p

A further object of the invention is to provide means which also enables the stroke of the separate pumps to be adjusted, so that the quantity oflubricant for each separate cylinder can 'be'separately adjusted.

Finally the invention has for its object to provide means, whereby the rod ext-endingthrough the cylinder cover can move freel even if the lubricatin device should be screwed askew on the cylinder cover.

In the accompanying drawings a constructional example of the lubricating pump according to the presentinvention is shown,

Figure 1 being an elevation of thelubrh eating device screwed onto the cover-oi a steam cylinder, certain parts being insection on-line I-I- of Fig. 3,

Figure 2 a vertical section bricating device on line 'IIII'of Fig.3,

Figure 3 a view of the lubricating device from above,

' Figure 4: a detail of the adjusting rneans partly insection on line IVs-IV of Figs; 1 and 2 and in a casing 10 which is fixed by means of the through the lu- Figure 52. side elevation of themeans for.

connecting pieces 11 to the bed plate 12. The bed plate is screwed by means of bolts 13 to thecover 14 ofa cylinder, in which a piston 15 reciprocates. j"

Into'the casing 10 there extends a shaft 16 which is driven inone direction by an arrangement to be described below and by a roller ratchet mechanismlfl with a detent device 17'. The shaft 16'is providedwith a gland 18.

'On'the projecting part offthe shaft 16 is a casing 20. This ratchetmechanisn 'casing 20'is providedwith an ordinary crank arm 19 made integral with 'it. On the ratchet mechanism casing 20 being rocked to and fro by means of the arm 19, it carries round with it the roller ratchet me'chanism17, which is of a Wellknown construction, and the-shaft 16 in one direction. On the casing 20 being rocked in the other direction the detent device 17? prevents the shai't16 from turning inthe reverse'dire'ction, so that the shaft 1 6 is turned,

intermittently in one direction by the rocking motion of the arm 19. A pin 21 passing through'the crank arm 19, engages in a groove.

22 between two flanges 24 at the end of a rod 23. One end of reduced diameter of the rod 23 extends through a casing 25 being secured therein by a nut 26 on the end projecting from the casing. 'In the casing 25 is a compression spring 27, which presses a washer 28 against the thicker part of the rod 23. Coaxial with therod23 is a rod'29 whichextendsthrough,

the cylinder cover. 14 and is raised each time the piston 15 reaches the'end of its upward stroke. The rod 29 thenraises the rod. 23.;

compres'singthe spring 27 and rocking the arm 19 upwards. On the piston 15 returning, the spring 27 forces thearm 19 and .therod 29 downwards again. In this way the shaft 16 is driven by the roller ratchet mechanism 17 in'one direction of rotation. a v For regulating the throw of this motion the casing 25 ismade slidable and adjustable in a' lateral projection 30 of-the casing 10. For I this purpose the casing 25 is screwed into a corresponding thread in the projection 30.

The casingf25 can beturned by means of a hexagonal part 32. A sheet metal member 33 secures the casing against being turnedunintentionally. When thecasing 25is screwed upward in its-thread, the distance, by which the crankarm 19 is forced-downwards after each lift, is shortened and the throw of the crank arm 19 and the amount of rotation of the shaft 16 is reduced. The lubricating device can be adjusted in this manner as a whole for delivering a greater or smaller quantity of oil. i

The rod 29 is slidable in a sleeve 35 inserted in an opening in the cylinder cover 14... The surface of the rod 29 is broken by a number of grooves 36, for providing a steam-tight closure. On a flange on the sleeve 35 a ring-37 rests, the upper surface of which is spherical and fits into a correspondingly turned part of asleeve' 38 which is screwed into theplate 12 by means of athread 39. Between the sleeve 38 and the upper part 39 of the sleeve 35 is a clearance 40. The upper end 41 of the sleeve 38 is made hexagonal. I

Before the apparatus is bolted on to the 'wylinder cover, the sleeve 35 is inserted in a hole in the cylinder cover 14, and, after the apparatus has been bolted down, the ring 37 is laid on the flange. of the sleeve 35 and the sleeve 38 is screwed into the plate 12, so that it presses firmly on the ring 27 and holds the sleeve 35 securely in the hole in the cylinder cover. As the rods 29 and 23 can move independently of one anotherjand as on account of the interposed ring 37 the sleeve 38 can move independently of the sleeve 35, the rod 29, when sliding in the sleeve 35, is not prevented from moving, even if the lubricating apparatus should not be bolted truly on to the cylinder cover or if during the operation of the device the relative position of the lubricating apparatus and the cylinder cover should slightly alter.

On the side of the casing 10 lying oppositethe casing 25 a number of lubricating pumps is mounted, in the example shownfive pumps. These pumps are numbered 45, 46, 47, 48 and 49. As all these pumps necessary to describe one of th em.

The lower part 50 of the pump, which is preferably made of iron, is fixed to the casing 10 in any suitable manner, for instance by screws 51. Into this lower part is screwed a hexagonal metal part 52 to the upper end of which by means of a cap nut 58 a pipe 54,'usually of copper, is connected so as to be oiltight. From each of the separatepuinps the pipe 54 leads to the place to be lubricated by the said pump,'which isnot shown in the drawing. When the lubricating device is mounted on an air pump for railway brakes, consisting of a high pressure and a low pressure steam cylinder, a high pressure and a low pressure air pump cylinder and two piston rods connecting the pistons of these cylinders together-by pairs, the pump 45 will for in stancelubric'ate the high pressure air cylinder, the pump 46 the low pressure air cylinder. the pump 47 both steam cylinders, the pump 4 8'the glands betweenthe two high pressure cylinders, and thepump -49 the are alike, it is only glands between the two low pressure cylinders.

In a bore 55 of the part 52 are provided two ball valves 56 and 57, which are pressed 011 their seats by means of light springs. Below the hole into which the hexagonal part 52 is screwed, is a cavity 58 in the part 50, from which a duct 59 leads downwards. At the lower end this duct is closed by a screw stopper 60. The lower part of the duct 59 is connected by a duct 61 to the interior of the casing 10. In a hole 62 which intersects the duct 61 at right angles and the end of which is closed bya screw stopper 63 is a plunger '64, at the end of which extending into the easing 10 a cylinder 65 is provided, which will in most cases be made in one piece with the plunger. This cylinder has a portion of its upper side cut away at 66, in which a'ballshaped head 67 engages, which is mounted on a shaft 68.' The shaft 68 is at right angles to the shaft 16 and extends right'throu'gh the casing 10. It is mounted in bearings 69 (Fig. 4) so as to be both rotatable and slidable in its longitudinal direction, At the end of the shaft 16 is a disc 70 with a recess 71, in which the ball-shaped head 73 of an arm 72 on the shaft 68 engages. On the shaft 16 being rotated the disc 70 will also rotate, causing the shaft 68 both to rock about its axis and to he slid longitudinally.

On thejshaft 68 there are provided as many ball-shaped heads 67 as there are lubricating pumps. On the shaft 68 rocking to and fro the ball-shaped head 67 each time strikes against the left-hand end of the recess 66 in the cylinder 65 and thereby pushes the cylinder 65 with the plunger 64 to the left into the position shown in the drawing. On the ball-shapedhead 67 rocking in the other direction, a 'spring75 forces the cylinder 65 and the plunger 64 to the right again. i The to-and-fro motion of the shaft 68 in its longifro on their own axes.

In the plunger 64 at the place where it communicates with the duct 59 is a transverse recess 76, from which a duct 77 exteiidsaxially through the plunger to theend of the same. The arrangement is such that the rec'ess 76 is always directed downwardsgwhen V a the plunger moves towards the right in Fig.

2 of the drawing. The plunger is thereupon caused to turn, so, thatthe recess 76 lies, at the'top, and then moves to the left in Fig. 2.

Thus during the movement of the plunger 64 to the rightlubricat-ing oil is drawn by suction through the duct '77 from the lower end of the duct 59 into the rear end of the duct 62. On the plunger returning with its recess 76 directed upwardly, the said'lubrieating oil is forced into the upper part of the duct 59 and passes through the ball valves 57 and 56 into the pipe 54 and thus to the place the stroke. The length of the stroke ofthe plunger 64 can be separately adjusted for each cylinder, for which purpose the following device is provided:

Opposite each of the'pumps 45 to 49, approximately in the middle of the casing 10,

i is a vertical shaft 80, the lower end of which is journalled in a bearing 81 and the upper end'of which is provided with a head 82 journalled in a conical bearing 83. A spring 84 abutting at oneend against the cover of the casing 10 and at the other end against a collar 85 on the shaft 80 forcesthe head. 82

firmly into the conical bearing 83,- so that a tight joint is formed at this bearing. On the top end of the shaft 80 a disc 86 is screwed, against which a spring 87 abuts. The spring 87 lies in a recess in the head 82. The head 82 consists of two parts 82 and 82 (Fig. 1) which are in engagement with one another by means of projections and recesses,;the projections being forced into therecesses by the spring 87. The part 82 has a milled edge,

by means of which the shaft 82 can be turned by hand and adjusted to any required position. For indicating the posit-ion of the shaft 80 a scale is marked on the bearing 83, on

which a pointer 88 on the part 82 reads; On

the lower end of the shaft 80is a cam disc 90 which lies opposite a projection 89 on the cylinder and the edge of which is inthe form of a spiral. The spring 7 5' can only force the cylinder 65 as far back as the position of the spiral-shaped cam disc 90 will allow. If the cam disc be turned, as shown at the right-hand side of Figure 4, so that the projection 89 rests against its highest point, the stroke of the cylinder 65 and the plunger 64 is reduced to the smallest amount. If however the cam disc 90 be turned so that its lowest point is opposite the projection 89, as shown in the middle of Figure 4, the cylinder 65 can be pressed back by the spring as far as the ball-shaped head 67 will allow. By setting the cam disc in the intermediate positions the stroke of the plunger 64 can be so adjusted that a greater or smaller quantity of lubricating oil will be delivered.

The interior of the casing 10 is divided by a partition 95, the position of which is shown in Figure 2 and is indicated in Figure 3 by broken lines, into two parts 96 and 97. The chamber 96 is closed by a screw-on lid 98 and the chamber 97 by a screw-on lid 99. The chamber 96 contains for instance a lightbodied lubricating oil for the cylinders of the air pump, while the chamber 97 contains a heavy-bodied oil for lubricating the steam cylinders. In the example shown the partition is so positioned that for instance the pump 47 which delivers the lubricating oil for the steam cylinders is in communication with the space 97, while the other lubricating punfip' ffthose,forlubricating the air-pump cylinders and their glands, are in communication with the; space 96.

In the wallsof the, casing 10 anumber of glass windows 100 are provided, through which the level ofthe oil in the chambers-can be seen, On the ,casing 20 a smalllubricator 101 is provided.

Before the 'air pump or some other machine to belubricated isput'in operation and itself operates the lubricating device by means of the rod 29, the. air; pump or, other machine to be lubricated must be given a preliminary oiling. For this purpose a hand operated crank 103 is provided on a shaft. 104 whichis journalled in a pillar 105 {screwed into the cylinder cover 14. A projection 106 onthe end of the shaft104 engages in a fork part 107 projecting from the hub of. the arm 19, being attached to thesame by means of a pin 108. By turning the crank 103 the lubricating device may be operated by-handfor giving the machine a preliminary oiling. WhatIclaimis: v p 1. In a system of the kinddescribed the combination of a. shaft with means for -turn-. ing the said shaft, a. second shaft, means. capable of being driven by the first shaft and of both rocking the second shaft and longitu-Q dinally sliding it to andfro, aplurality of lubricating pumps, a pistonin each lubricating pump, means provided on the second shaft capable of moving the pistons in one direction, means forreturni ng the said pistons and ca pable of limiting the return movement of'each piston to a pre-determined amount, the said latter means comprising a cam disc and means rod movable in said casing and operatively connected to the lubricating apparatus so as to'be capable of driving said apparatus, said said first mentioned rod, and a spring in said second rod being capable of displacement by casing surrounding saidsecond rod and capable of urging it towards the first mentioned rod, for the purposes set forth.

'3. In a system of the kind described the combination of a machine comprising a movable part, a lubricating apparatus, a rod between the movable part and the lubricating apparatus and capable of displacement by said movable part, said rod being capable of driving the lubricating apparatus, means for urging the said rod toward said movable member, a sealing sleeve surrounding said rod, said sleeve beingpassed through a wall of the machine and a device on the lubricating apparatus for securing the sleeve in the wall of the machine, said device surrounding thesleeve with aclearance space between it and 'the said sleeve so as to allow relative movement between the former and'the "latter, as andfor the purposes set forth. g

4. In a system of the kind described the combination of a machine comprising a movable part, a lubricating apparatus, a rod between said movable partand said lubricating apparatus and capable of displacement b y said movable part, a sealing sleeve surrounding said rod, said sleeve being passed through a Wallof the machine, a flange on said sealing sleeve, a ring on said flange having a spherical bearing surface, a sleeve on the lubricating apparatus and surrounding said first mentioned sleeve,- Wltll'it clearance between itand said first mentioned sleeve so as to allow relative movementbetween the former and the latter, said second sleeve being capable of bearing against said ring for securing the first mentioned sleeve on the said wall of the machine, a casing capable of adjustment with respect to said rod, a second rod movable in said casing and operatively connected to the lubricating apparatus so as to be capable of driving said apparatus, said second rod being capable of displacement by said first mentioned rod, and a spring in said casing surrounding said second rod and capable of urging ittowards thefirstmentioned rod, for the purposes'set forth.

5. In a system of the kind described the combination of a machine comprising a movable part, a' pump casing, a'driving shaft rockable in said pump casing, an arm secured on said shaft for rocking the shaft, a rod slidable in a wall of said machine and capable of displacement by said movable part, a casing mounted on the pump casing and capable of adjustment thereon with respect to said rod, a second rod movablein said adjustable casing and operatively connected to said arm,

said second rod being incontact with said first mentioned rod so as tobe capable of displace ment by thelatter and a spring in said adj ustable casin surrounding said second rod and capable of urging ittoward the first mentioned rod, for the purposes set forth.

6. In a system of the kind described the combination of a shaft withineans for turning the said shaft, a secondshaft capable of being rocked as Well as of being reciprocated. axially, means on said first mentioned shaft and operatively connected to said second shaft for both rocking the second shaft and sliding it axially to and fro, a plurality of lubrieating pumps, a piston in each lubricating pump, an elongated axial recess in each of said pistons, driving means on the second shafthaving ball heads engaging in said reg cesses for moving the istons in one direction, means'for returning t lie-said pistons andadjustable stop members,'one for each piston capable of limiting the return axial movement of each piston to a pre-determined amount, as set forth. p

In testimony whereof I have signed my name to this specification. I

- HEINRICH ETZELT.

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