MXPA00000860A - Telescopic hydraulic hoist apparatus - Google Patents

Abstract

The primary object of the invention is to provide a telescoping hydraulic hoist (10) which is significantly lighter than hoists of similar types. The telescopic hydraulic hoist (10) is made of drawn-over-manual (DOM) aluminum tubing consisting of a specially formulated alloy. The hoist is fast-acting, has a greater bearing life, and air breathers (94, 96, 98, 100, 102) for the spaces between hydraulic stages, to prevent dirt from being sucked into the hydraulic mechanism.

Description

TELESCOPIC HYDRAULIC ELEVATOR EQUIPMENT FIELD OF THE INVENTION This invention relates to mechanisms of hydraulic elevators, telescopes, and in particular to mechanisms that are made of laminated aluminum material, are fast acting; they have a greater life against friction and air vents for the space between the hydraulic stages, thus preventing dirt from being sucked into the hydraulic mechanism.

BACKGROUND OF THE INVENTION The catalog of the Division of Hydraulic Cylinders of Commercial Intertech Distribution Services (Date?) Pages 23-34 illustrates a number of "Drawings of Identification of Cylinders of Turning" each one of which represents a hydraulic mechanism, telescopic, particular, identified respectively as "ANTHONY"; "COMMERCIAL"; "CUSTOM HOIST"; "FONTAINE"; "PEABODY GALION"; "GLENCO / FARMHAND"; REF .: 32464"HEIL" OLD STYLE "" ?? PT SERIES ";" HEIL "NEW STYLE" "HPT SERIES"; "HYCO 900-2000 SERIES"; "HYCO 10,000 SERIES"; "HYCO 30,000 SERIES"; "HYCO 70,000 SERIES"; "JOHNSON"; "LESSARD"; "MAILHOT /" C ";" MAILHOT / "M" MODEL COVER TUBE DESIGN ";" MARION MFG ";" NORDI C / NORD- SEN METAL INDUSTRIES ";" PERFEC TI ON ";" PERFECTION FARM HOISTS ";" PRINCE " AND "WARD CO." These hydraulic, telescopic tipping cylinders collectively describe several modern features of this mechanism, such as an oil hole in the base ring and various sealing mechanisms. 3,958,376 issued to Campbell and entitled: "Elongated Tower Structure" describes a plurality of housed tower sections that can be telescopically raised to an extended position to support a load therein. tower sections extend tower sections US Patent No. 4,928,488 issued to Hunger and entitled: "Hydraulically Operated Support Device for Semi-Rowing 1 s" describes a _ isx i ^ M ^ .y extendable cylinder at the bottom of which is formed a cylinder for the lifting of loads, for a piston lifting loads. A secondary pump assembly includes three pumps that operate independently to generate and control the hydraulic pressure of the operation. Finally, U.S. Patent No. 4,471,944 issued to Leray et al., And entitled: "Telescopic Jack" describes a plurality of telescopic, tubular, or axial elements, mounted within a cylinder and each pair of telescopic, tubular, adjacent elements, it has two pairs of co-operating annular recesses, on its inner and outer surfaces, which cooperate with an elastic ring to limit the outward movement of an internal tubular element, relative to its adjacent outer element. The hydraulic, telescopic mechanisms of the prior art, which are exposed to the abnormal wear of their bearings, operate slowly, have an inadequate seal that admits dirt inside the hydraulic cylinders and are heavy.

~ ' BRIEF DESCRIPTION OF THE INVENTION A main objective of the invention is to provide a telescopic hydraulic lifter of the type specified herein, and which is significantly lighter than prior art lifts of a similar type. A feature of the present invention is that the telescopic hydraulic lifter is made of a manually drawn aluminum tube (DOM) by a specially formulated alloy. An advantage of the present invention is that the hydraulic lift is lighter and is transported and placed more easily for use, than similar devices of the prior art. Another object of the invention is to provide a hydraulic, telescopic-moving elevator, of the type specified herein, having an increased operating speed. A feature of the present invention is that the hydraulic lifter, telescopic, can be contracted or expanded at an increased speed with respect to that obtained in elevators built of steel. An advantage of the present invention is that the telescopic hydraulic lift moves rapidly to or out of the operating position. A further object of the invention is to provide a telescopic hydraulic lifter, of the type specified herein, which prevents dirt from being sucked beyond the cleaners. One feature of the present invention is to provide space between the stages above the seals, so that air is breathed therethrough to prevent dirt from entering the seals between the telescopic stages. A further advantage of the invention is that dirt is prevented from entering the seals between the telescopic stages of the hydraulic lift. Still a further object of the invention is to provide a telescopic hydraulic lifter, which has a long life. Still a further feature of the invention is that the surface of the tube provides a wear surface for the bearings. Still a further advantage of the invention is that the bearings of each stage compress against the surface of the telescopic tube.

BRIEF DESCRIPTION OF THE DRAWINGS It is believed that the above objects, features and advantages of the invention are apparent from the following description of a preferred embodiment of the best mode for carrying out the invention, wherein: Figure 1 is a sectional view, lateral, partial, of the telescopic, hydraulic, aluminum elevator, in accordance with the invention; Figure 2 is a bottom view of the hydraulic elevator; Figure 3 is a top view of the hydraulic lift; Figure 4 is a partial sectional view of the aluminum hydraulic lift in an extended position.

DETAILED DESCRIPTION OF THE INVENTION Previously, the telescopic hydraulic elevators were manufactured from steel alloy tube and consequently were heavy and subject to corrosion. In accordance with the present invention the telescopic hydraulic lift is made of aluminum alloy tubing and is therefore considerably lighter and not subject to corrosion. An aluminum alloy suitable for the purposes of the present invention has the following exemplary composition: Silicon 0.35; iron 0.40; copper 0.10; manganese 0.20-0.7; magnesium 1.0-1.8; chrome 0.06-0.20; zinc 4.0-5.0; titanium 0.01-0.06; zirconium 0.08-0.20; various trace elements 0.05-0.15; and the rest is aluminum. The aluminum alloy tubes in the exemplary embodiment of the invention described herein, typically have a variable length depending on the desired telescopic length of the elevator and a thickness of substantially 0.127 cm (0.050 in). Figure 1 illustrates a hydraulic lift 10, of aluminum alloy, having five stages 12, 14, 16, 18 and 20 in the non-extended position and being mounted on a base casting 22. The connector 24 for greasing a pressure, provides a means to apply grease to a rod-eye casting 26, which allows the attachment of the hydraulic lifter 10, either to the platform of a dump truck or to the chassis of a dump truck, for example, allowing with that the platform of the dump truck is elevated. The base 22 includes the inlet 28 for the hydraulic fluid and the threaded portion 30 (Figure 4) for attaching thereto an aluminum alloy tube 12 of the first stage. An "O" Ring 32 or seal is provided, as indicated in Figure 1 and an additional width bearing 34, 36, 38, 40 and 42 is provided respectively for the single tubular stages 94, 96, 98, 100 and 102 are placed on each of the hydraulic stages 12, 14, 16, 18 and 20 as illustrated in Figures 1 and 4. The fixing screws 104, 106, 108, 100 and 112 serve to joining each of the air vents 94, 96, 98, 100 and 102 to their respective hydraulic stages. With the hydraulic device 10 placed between the platform of a dump truck and the chassis thereof (not shown) the introduction of hydraulic fluid to the hydraulic devices 10 through the inlet 18 for fluid, the different hydraulic stages 12, 14, 16, 18 and 20 extend from the position illustrated in Figure 1 to that shown in Figure 4, whereby air is caused to escape through air vents 94, 96, 98, 100 and 102 thereby allowing that each stage of the hydraulic device moves more rapidly from a folded position, as shown in Figure 1, to an expanded position, as shown in Figure 4. The following characteristics of the invention are evident from a consideration of the preceding description 1. ) The hydraulic lift is of double action since the hydraulic fluid can be fed from each end; 2 . ) The different components of the hydraulic lift are not welded, thus preventing any distortion of the hydraulic lift; 3.) Because the stages are threaded, the hydraulic device can be serviced more easily; 4.) There is a long overlap of the hydraulic stages, thus allowing the hydraulic lifter to have a long overall extension and that is achieved by carrying each of the different stages to the base and thereby increasing the resistance of the hydraulic lift; 5.) Because the different stages are sealed inside, the scratches or nicks on the exposed surfaces of the stages, do not affect the sealing; 6.) There is a faster response of the hydraulic stages, due to the hydraulic supply and the fact that through a hole wear bands pass; and 7.) The use of air vents that prevent dust and dirt from entering the hydraulic stages.

The above description serves only to describe exemplary embodiments of the best mode of producing the invention, to demonstrate the characteristics and advantages of its structure and operation. The invention is not intended to be limited by the same, since those skilled in the art of product retention packages will easily perceive modifications of the modalities described above. In this way, it is intended that the invention be limited only by the following claims and the equivalents to which the claimed components thereof are entitled. It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates.

Claims (9)

1. A hydraulic, telescopic, multi-stage elevator, characterized in that it comprises: a base member, of aluminum alloy, including an inlet for hydraulic fluid and an eyelet bar; an aluminum alloy tube, of the first stage, attached to the base member; a number of additional aluminum alloy tube stages, configured within the tube of the first and aligned with the base member, thereby providing an overlap between the tubular stages; a respective seal mounted on the inside of each tubular stage; and an aluminum alloy upper member including means for attaching thereto the innermost of the tubular stages, a connector for pressure greasing, for greasing the eyelet bar and an air vent.

2. A hydraulic, telescopic, multi-stage elevator, in accordance with the rei indication 1, characterized in that it also comprises a mattress member, mounted on the base, to cushion the downward movement of the first tubular stage.

3. A hydraulic, telescopic, multi-stage elevator, according to claim 1, characterized in that it also comprises a respective air vent mounted in each tubular stage.

4. A hydraulic, telescopic, multi-stage elevator, according to claim 1, characterized in that it further comprises a fixing screw, respectively, for retaining each of the tubular stages with respect to an adjacent tubular stage.

5. A hydraulic, telescopic, multi-stage elevator, according to claim 1, characterized in that it further comprises a bearing and a means for retaining the bearing, for each of the tubular stages, and which is mounted to the base member; a respective "0" ring seal and a seal retainer, for each of the bearings, and stroke limiters, of variable length, to vary the stroke length of each of the tubular stages.

6. A hydraulic, telescopic, multi-stage elevator, according to claim 2, characterized in that it comprises a respective air vent, mounted to each tubular stage.

7. A hydraulic, telescopic, multi-stage elevator, according to claim 6, characterized in that it also comprises a fixing screw, respectively, for retaining each of the tubular stages with respect to an adjacent tubular stage.

8. In addition, it comprises a bearing and bearing retaining means for each of the tubular stages and which is mounted to the base member; a respective O-ring seal and a seal retainer, for each bearing, and stroke limiters, of variable length, to vary the stroke length of each of the tubular stages.

9. A hydraulic, telescopic, multi-stage elevator, according to claim 8, characterized in that it also comprises a respective air vent mounted on each tubular stage.