US1875181A - Central lubricating device - Google Patents

Description

Aug. 30, 1932. o. SCHNEIDER CENTRAL LUBRICATING DEVICE Filed Aug. 12. 1929 Patented Aug. 30; I932 *rreD STATES,

OSKAR SCHNEIDER, OF BERLIN, GERMANY CENTRAL LUBRICATING DEVICE Application filed August 12, 1929, Serial No. 385,250, and in Germany February 11, 1929.

The subject of the invention is a central lubricating device which is intended especially for grease but can also be used to advantage for oil. It forces the lubricant to the places to be lubricated by means of piston pumps, which is not the most reliable method in principle,.but does not, like already known appliances, need as many pumps as there are lubricating points or groups of lubricating points, while nevertheless offering the certainty that even if one pump fails completely, all lubricating points will be supplied notwithstanding.

The efiicacy of grease lubricators of known design has hitherto been impaired or cancelled mainly by two facts, in the first place owing to the fact that grease can be induced by suction like a liquid, and in the second place owing to the fact that air or other gases got into the channels or pipes and were then alternately compressed and expanded instead of transmitting the conveying or delivery movement of thepump piston.

These two defects have been remedied by special original contrivances in the new apparatus.

A constructional example is shown on the drawing appended.

Fig. 1 is a vertical central sectionthrough the apparatus.

/ Fig. 2 is a horizontal section on the plane indicated by the line 22 of Fig. 1.

'Fig. 3 is a similar view on the plane indicated bythe line 33 of Fig. 1.

In the container 1 agitator wings 2 revolve at different distances from their shaft of rotation 3, one of said wings moving in close proximity to the inner wall of the container '1. Below the agitator arms is a valveless l0 pump which is formed by the hollow chamber 4 of an intermediate bottom 5 shut ofi by a cover 6 and blades 7. The hollow chamber 4 of circular plan lies eccentric to the shaft piece '3, on which the agitator arms 2 are fixed, and through which in corresponding slots the two slides 7 slidable lengthwise are passed. At the point of intersection the slides 7 are cut away at 8 on their lower sides for a suitable distance from their inner ends as shown at Fig. 1 to enable them to extend over each other and not hinder each other,

The lid 6 has a large recess 9' permitting of the entry of the grease into the valveless pump, and the bottom of the chamber 4 a few holes 10 which lead down to the receiving chamber 11 in which the pump device to be described hereafter acts. Below the openings 10 there is arranged a strainer, for example, a perforated plate 12 in such manner that thegrease conveyed downwards by the valveless pump must ass through this strainer before it reaches t 1e chamber 11.

Laterally to the valveless pump smaller holes 13 are also provided in the floor 5 which allow the excess grease supplied to the pumping device by the valveless pump, and any air carried along to pass back upwards into the container 1.

In a cylindrical or conical bore of the foot 14 of the device there rotates a corresponding- 7 1y cylindrical or conical distributor 15, which is driven by the pair of Worm wheels 16 from the shaft 17.

With this distributor 15 the shaft piece 3 for the agitator wings 2 and the slides 7 is coupled owing to the fact that the shaft piece has a diametric transverse slot in its lower end into which fits a key 18 at the upper end 'of the distributor 15. This detachable coupling permits of taking out the valveless so pump with agitator, upwards and thus exposing the pump device and the distributor. Near its upper end the distributor carries two radial pump cylinders 19 in which the pump pistons 20 act.

The working chambers 21 of the pumps are each connected by a channel 22 on the one hand with admission bores 23 and on the other hand with discharge sockets 24 which lead to the distributing pipes 25. The channels 22 at the point where they are able to come opposite the admission and discharge openings 23 and 24, are open towards the periphery of the distributor body 15 and the arrangement of the admissions and discharges 23 and 24 is such that each channel 22 when it is opposite the admission opening is shut ofl from the discharge opening and conversely. I

The pistons 20 are on each side for a certain distance provided with rack teeth 26 in which the toothed crown of the pinion 27 which is toothed on part of its periphery, engages. Integral with the pinion 27 by its shaft 28 there is in each case a cam 29 which, on rotation of the pump cylinders 19, alternately co-operates with radial control or distribution cams 30 and the like cams 31 parallel to the shaft.

If the distributor 15 revolves in the direction of the arrow shown in Figs. 2 and 3 the agitator wings 2 set the grease contained in the container 1 in movement in such manner that it can uniformly enter the receiving opening 9 of the rotary pumps and is in this process already freed as far as possible from air.

The slides 7 of the rotary pumps catch up the grease which has entered the chamber 4 and thrust it towards the passage holes 10, subjecting it to a certain advantageous pressure. This is brought about by the'fact that the shaft piece 3 of the valveless pump is eccentric to the pump chamber 4 and the slides 7 are at their freeends, as seen from Fig 2, controlled by the-cylindrical inside wall of the pump chamber 4.

The grease pressed downwards through the openings 10 must pass through the strainer 12. The strainer not only keeps back any impurities, but by the splitting up of the grease also produces a separation between grease and any air which it may carry.

As the valveless pump delivers more grease than the pump device can move onwards, a certain overflow constantly flows through the thin openings 13 back into the container 1. upwards, and along with this excess also any hair which may have reached the pump cham her 11, and there tends to rise upwards below the intermediate bottom 5, especially as the grease in, the pump chamber 11 is constantly under the pressure created by the valveless pump. Under the same pressure the grease, through the bores 23 reaches the channel 22 and passes behind the piston bottom, so that it can share in the movement of the piston. On the'drawing the pistons of both pumps are shown in their own end position in which they have emerged farthest from the pump barrel 19 (suction stroke). If now, in the position drawn, the cam 29 strikes against one of the radial pins 30, then its shaft 28 is rotated clock-hand Wise and the piston 20 is pushed in to the cylinder 19 by the rack teeth. Meantime the channel F pins 31 parallel to the shaft, and is again swungback by the latter so that the piston 20 in the cylinder is moved outwards, during this movement the channel 22 is again in front of an admission 23., Therefore the grease under pressure in the pumpchamber 11 noW presses out of it into the pump cy1 inder.

The amount of the quantity of grease conveyed on each piston stroke can be altered owing to the fact that the screw threaded control pins 30 screwed into the outer wall of the apparatus are put further inwards or further outwards and held by corresponding lock nuts.

The individual parts of the new apparatus can of course likewise be designed in another wayconstructively. For example instead of the valveless pump drawn any other satisfactorily working grease pump can be used. likewise the arrangement and control of the pump pistons 20 is possible in another way,"

and also the design of the distributor 15 with its channels and shut-ofls, but the constructional form'illustrated is characterized by special simplicity and suitability.

It is to be noted that for the conveyance of grease to the pipes 25 there are available not only 1 but 2 greasepuinps 20, 21 so that even ifa pump should fail for any reason, nevertheless each lubricating pipe and each lubricating point regularly receives a supply though smaller of grease, while on the other hand the two pumps 20, 21 can supply any desired number of lubricating points.

I claim:

1. Lubricating apparatus of the class described, comprising a structure having a grease container and a receiving container with wh ch; the grease container communicates, a revoluble element, a pump arranged in the receiving container and compressing means in the grease container including a rotor, said rotor and said pump being revolved by said revoluble element, a plurality of pumps carried by the revoluble element, and a plurality of discharge ducts leading from the receiving container, the said revoluble element forming a valve which controls the admission of grease from the receiving container to thepumps and the discharge of grease from the pumps through the discharge ducts. I

2. Lubricating apparatus of the class de scribed, comprising a container, a revoluble element, a pump arranged in said container able thereby to impart oscillatory movement thereto and hence reciprocatory movement to the piston.

3. Lubricating apparatus as claimed in claim 2, in which one of said tappet elements is adjustable radially, 1

In testimony whereof I have hereunto set my hand this 7 th day of May, 1929.

OSKAR SCHNEIDER.

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