Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven...
Patent
1985-12-19
1987-12-15
Petrakes, John
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
74128, 74129, 188 651, 254228, 277103, 277113, B66D 318, B25B 2500, F16H 2702
Patent
active
047127724
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to actuators brought into operation by means of pressurized fluid medium and, more particularly, it relates to power hydraulic gears.
This invention can be used most conveniently for conveying loads through considerable distances under conditions of great forces developed by the actuator. Such gears may find extensive application in the mining industry for developing various hoisting mechanisms, for conveying large-sized loads through great distances under conditions of restricted space.
The invention may also find application in the construction industry for developing power winches and general-purpose transportation means.
PRIOR ART
Currently known in the art are numerous actuators embodying the principle of hydraulic power cylinders used for the conveyance of loads and as driving mechanisms for diverse equipment. the use of most such mechanisms in transportation means designed for conveying heavy loads through considerable distances presents a number of difficulties because of inherent restrictions upon the length of working stroke due to finite length of piston rods, as well as because of the impossibility of developing considerable forces due to the emergence of strong leaks of the working fluid through seals.
There is known in the art a power hydraulic gear (cf., EP Application No. 0057622, Int.Cl. B 66 D 3/02 // F 16 G 11/04) comprising a housing to which are secured two double-acting hydraulic cylinders whose rods are connected with one self-gripping block while the cylinders are connected with another block. A wire passes through the blocks in the axial direction. The blocks are provided with wire-gripping members. The operation of the cylinders in accompanied by alternate gripping of the wire from which a load is suspended. The overall dimensions of such prior art gear, as well as the rate with which said gear will move the load, depends upon the parameters of the hydraulic cylinders and their piston stroke.
The basic performance of such power hydraulic gear depends fully upon the structural arrangement of its hydraulic cylinders. The mass of load being moved and its rate depend upon the rod length and diameter and the rod end volume of the hydraulic cylinder. An increase in the mass of load being moved calls for an increase of the rod diameter which, in its turn, leads to a reduction of its length and increase of the rod end volume, the latter increase resulting in a reduction of the rate of moving the load. Consequently, given such a structural arrangement of power hydraulic gear, the overall dimensions of a corresponding high-power drive would be so bulky as to render its manufacture technically and technologically impossible.
Further known in the art is a power hydraulic gear fashioned as a slide mechanism with a hydraulic drive for lifting and lowering loads (cf., F.R.G. Patent Application No. 1,219,199, NPC 35 d 2/05), comprising a lift cylinder having a piston with a spring and a traction member in the form of a rod, means for engaging said rod in the form of a top gripping head and a bottom gripping head with top and bottom pressure chambers, and a control member. The top gripping head is rigidly coupled with the lift cylinder piston and control member. The bottom gripping head is rigidly coupled with the lift cylinder piston. The lift cylinder piston is made integral with the rod connected by means of a guide to the control member piston. Depending on the position of the control member, there occurs a sumultaneous connection to a pressure source of the top pressure chamber of the bottom gripping head and of the pressure chamber of the lift cylinder. After the lowering of the bottom gripping head, the pressure source starts communicating with the bottom pressure chamber of the bottom gripping head. Immediately thereafter and prior to the completion of the downward stroke of the top gripping head, the top and bottom pressure chambers of the top gripping head communicate with the pressure source with the aid of a delivery pipeline and a disc
REFERENCES:
patent: 3228703 (1966-01-01), Wilson
patent: 3393917 (1968-07-01), Kendall et al.
patent: 4456226 (1984-06-01), Stumpmeier
patent: 4593884 (1986-06-01), Zschocke et al.
Churkin Vladimir G.
Klimov Sergei B.
Negrutsky Boris F.
Negrutsky Sergei B.
Hail III Joseph J.
Petrakes John
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