US2145384A - Hydraulic system - Google Patents

Description

G. S ALLIN Jan. 31, 1939.

HYDRAULI C SYSTEM Filed Oct. 6, 1957 INVENTOR GEOEGE S. 14mm! 25 with the hydraulic circuit and by reason of the slots Ill-l, which, open respectively into sumps 25 whereinwill be, in effect, a wiping action of the lower edge 55 Patented Jan. 31, 1939 r 2,145,384

UNITED STATES PATENTOFIFICE 2,145,384 mrmmuuc SYSTEM George S. Allin, Seattle, Wash. Application October 6, 1937, Serial No. 167,595 2 Claims. (Cl. 121-1) This invention relates to improvements in hy- Fig. 1 is a longitudinal, sectional view of a hydraulic jacks, hydraulic hoists and other hydraudraulic cylinder. having cylinder sumps in accordlic power systems employing metal cylinders in ance with the present invention.

which metal pistons are fitted for reciprocal Fig. 2 is a. cross sectional detail on the line 5 travel under the force of a hydraulic pressure 2--2 in Fig. 1. v 5

medium or where the piston operates to eflect Referring more in detail to the drawingpressure through the hydraulic medium; such I designates a hydraulic cylinder having its opjacks, or hoists, being used extensively at the posite ends closed by the cylinder heads 2 and present time in road building and dirt hauling 3, which may be permanently secured to the cyl- 1o equipment, as will be disclosed by reference to inder either by the welding, as indicated at d, or Patent No. 2,072,998, issued to me March 9, 1937, by any other suitable means. The cylinder is and to the application filed by me under Serial fitted with a piston 5 having encircling grooves No. 76,594 on April 2'7, 1936, although it is under- 5a. fitted with packing rings 5b of the convenstood that it is not to be confined to such equiptional form. Connected with the piston is a pisment. ton rod 6 which extends through a, packing gland l5 Explanatory to the present invention, it will I in the cylinder head 2. The cylinder head 3 is here be stated that it is the case, especially when equipped with a mounting lug 8, and the rod 6, at the hydraulic cylinders are horizontally disposed,. its outer end, is equipped with a cross head or that the cylinder walls will become scored along bearing 9, whereby it may be attached to operthe lower-side by reason of foreign matter, such ating part to be operated by, or which may actu- 20 as metal chips, shavings, or filings being picked ate the piston. up between the piston and cylinderwall. This As was previously mentioned, the cylinder l foreign matter may come from the pipes, tanks, is disposed horizontally, and .is provided in its castings or other parts of the system in contact lower side wall, at, the opposlte'endawith cross circulation of the hydraulic medium; will ultiii and Ii, formed inhousings i2 and it, that mately find its'way into the "cylinder, and, by may be welded to or formed integral with the reason of the reciprocal action of the piston, will 'cylinder body. Each sump is provided with a work its way into the joint between the piston drainage or clean-out opening, and a plug it and cylinder walls, with the result that the cylis removably threaded into the opening. 0 inder walls become scored. This scoring ofthe One feature of this invention resides in the cylinder wall is detrimental to the operation of fact that the cross slots Ill are so located that the device, as will be understood by those familiar the opposite edges oi. the piston will, as the piswith the art,- it is damaging to the equipment, and ton moves to its opposite limits of travel, overlap any leakage materially reduces its efiiciency, espetherewith to the extent indicated in Fig. 1. cially when high pressures are to beheld by the Pipes l8 and I9 connect with the opposite ends piston. oi! the cylinder through the cylinder heads 2 and In view of the above, it has been the principal 3, and when a hydraulic medium is used to actuobject of this invention to provide a cylinder ate the piston, any suitable means, pump or the 40 construction that will overcome the destructive like, not herein shown, maybe utilized for efiect: 40 and detrimental effects of any foreign matter that 'ing the delivery of the liquid pressure medium may collect in the cylinder. 1 through the pipes into the cylinder.

. It is a further object of this invention to provide Assuming that the device is so constructed and the cylinders in such use with sumps for the assuming also that the pressure medium is adcollection or such material and to provide for mitted into and from the opposite ends of the 45 its removal from the sumps. cylinder in accordance with any necessary mode' Still further objects of the invention reside in of opera io whereby the piston will c p the details of construction of-the sumps and the al y c u d en e limits of vel i direlationship t t li t of tr of th pigcated by the full line position and the dotted line t in th yn d position, it will then be quite apparent that any 50 In accomplishing these and other objects of foreign Substance, Such as a metal chip, vi g the invention, Ihave provided the improved deor the like, on entering the cylinder, will settle tails of construction, the preferred forms of which to the bottom and will be pushed by the pi t are illustrated in the accompanying drawing, in its reciprocal action, into the sumps. There portions of the slots into the sumps and this willoperate to remove any of the foreign matter that would other wise cling to the piston edge. In view of the fact that the foreign material does not have the opportunity of entering the joint between the piston and cylinder wall, the detrimental scoring effect will not take place.

While I have described the invention in connection with hydraulic cylinders disposed horizontally, it is to be understood that this has reference to cylinders in any position that would permit foreign matter to settle against the bottom wall of the cylinder, as distinguished from settling against a cylinder head. The cylinder may be horizontal, or it may be inclined to a substantial degree between horizontal and vertical positions, and still-can employ sumps of this character to advantage.

1 Cylinders are in use at the present time which have very effectively demonstrated the practicability and utility of this construction for it is quite readily apparent that, periodically, the sump may be cleaned of debris, and if this is done before the sumps fill up, there will be no occasion for any damage being done to the cylinder walls or piston by reason of'the collection of foreign matter in the system.

2,145,384 piston across the edges of the The construction, while applicable particularly to hydraulic jacks and hoists,-may be utilized in cylinders for various other purposes with the same advantageous results. Therefore, it'is the intent that the claims be given an interpretation that is commensurate with the invention disclosed.

Having thus described my invention, what I claim as new therein and desire to secure by Letters Patent is- 1. In a hydraulic system, a hydraulic cylinder and a piston reciprocally movable therein, said cylinder'having cross slots in its bottom wall at the opposite limits of travel of the piston, housings fixed to the cylinder and forming closed sumps to receive sediment passing through the slots.

2. In a hydraulic system, a hydraulic cylinder and a piston reciprocally movable therein; said cylinder'having cross slots in its bottom wall at the opposite limits of travel of the piston, housings fixed to the cylinder and forming closed sumps to receive sediment passing through the slots, and said sumps having clean out ports and plugs removably threaded into the ports.

GEORGE S. ALLDI.

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