Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1990-09-18
1991-12-24
Olszewski, Robert P.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187 2, 187 12, 187 95, B66B 1104
Patent
active
050743830
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates generally to hoisting and transportation equipment, and more particularly to hoisting machines.
BACKGROUND OF THE INVENTION
There is known a hoisting machine comprising a vertical pole having a guide along which carrying elements move. Provided at the carrying element closest to the top of the pole is a bracket for attaching a weight thereto. The carrying elements are moved along the guide by a hydraulic cylinder positioned at the bottom of the pole. The carrying elements are brought close to the pole and removed therefrom manually (cf., SE, C, 417,082).
However, manual displacement of the carrying elements makes the machine less reliable in operation and complicates its servicing.
There is also known a hoisting machine comprising a tubular pole having weight and build-up branches extending in parallel along the pole and having carrying elements movable along the branches, a bracket for securing the weight bearing on the carrying element closest to the top of the pole, and a mechanism for moving the carrying elements along the branches and displacing them from one branch to the other positioned at the base of the pole.
This mechanism includes a vertical hydraulic cylinder having two rods and positioned so that the rods are coaxial with the build-up and weight branches, accordingly, and a horizontal hydraulic cylinder whose rod has a clamp means for gripping the carrying element to displace it from under one branch to the other branch, and further having spring-loaded pivotable stops under each branch provided with lugs for restricting, in the drawn-together position of the stops, the movement of the carrying elements under the force of gravity, and a removable sleeve fitted onto the first or second rod of the vertical hydraulic cylinder depending on the direction of movement.
Operation of this hoisting machine meets with difficulties associated with ensuring strictly alternate functioning of the vertical and horizontal hydraulic cylinders, which makes the machine less reliable. In addition, in order to draw the pivotable stops under the weight branch apart, the removable sleeve positioned at the rod of the vertical hydraulic cylinder coaxially with the weight branch takes up loads both vertically from the weight and carrying elements present, in the weight branch and horizontally as a result of friction between the lugs of the pivotable stops and end face of the carrying element proportional to the mass of the weight, which necessitates an extra force to be applied by the vertical hydraulic cylinder and results in excessive wear of the pivotable stops and surface of the removable sleeve.
There is further known a hoisting machine comprising a tubular pole with weight and build-up branches extending in parallel along the pole and having carrying elements capable of movement along the branches, a bracket for securing the weight to be lifted bearing on the carrying element closest to the top of the pole in the weight branch, a mechanism for moving the carrying elements lengthwise of the branches and displacing them from one branch to the other positioned at the base of the pole and having a housing accommodating a hydraulic cylinder positioned so that the axis of its rod runs in line with the axis of the weight branch, the rod having two pins coaxial with the respective branch, and a frame with rollers capable of travelling in a plane perpendicular to its axis in a direction from one pin to the other, whereby the frame can assume two extreme positions determining elevation or lowering of the weight, pivotable stops under each branch having lugs for restricting, in the drawn-together position of the stops, the movement of the carrying elements under the action of the force of gravity, and shaped surfaces intended to engage with the frame rollers, whereby as the rod of the hydraulic cylinder moves to the base of the branches the stops are drawn apart to disengage from the carrying elements, the spring mechanism for returning the stops to the drawn-together positi
REFERENCES:
patent: 4522129 (1985-06-01), Jerberyd
Baryba Yakov V.
Raikhlin Mark M.
Olszewski Robert P.
Reichard Dean A.
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