| JP2583690 | LINEAR MOTOR TYPE ELEVATOR DEVICE |
| JP2914832 | [Title of Invention] Self-propelled elevator |
| JPH04182292 | CIRCULATION TYPE ELEVATOR |
| US3468401A | 1969-09-23 | |||
| US6676233B1 | 2004-01-13 |
| CLAIMS: What is claimed is the invention of a column lift mechanism using rotating screw, 1) The Invention of a column lift mechanism using rotating screw with at least a central screw, driving force-generating system with the ability to rotate clockwise and counterclockwise, a vertical base equipped with toothed plates, cabin, the connection system of cabin to the main column and sliding wheels to control the movement or asymmetric shear load. 2) The invention of claim one that driving force can works by an electromotor or diesel engine, or any engines or electromotor or driving system that can be manufactured. 3) The invention of claim one that electromotor can work clockwise or counterclockwise. 4) The invention of claim one that electromotor is equipped with a speed reducing system (gearbox). 5) The invention of claim one In which the movement transmission from the motor and gearbox to the main shaft can have 45-degree mechanism, or any other types or any other system to change the direction of the driving force. 6) The invention of claim one that, central shaft has two or more helical screws standing vertically in the same direction with the lift column. 7) The invention of claim one that, helical screws have two bearings at the two ends and are connected to the metal rigid plate from up and down. 8) The invention of claim one that, vertical column has three or more rack gears which are positioned together with an identical angle. 9) The invention of claim one that the gears are made of steel or any other rigid and strong materials. 10) The invention of claim one that, rack gears are surrounded by a framework which can put the rack gears together with correct angle and distance. 11) The invention of claim one that, main base has rails at its edges for the movement of sliding wheels. 12) The invention of claim one that, a connecting system to connect moving screws to the cabin. 13) The invented apparatus of claim one is so that the increase in the number of rack gears around the helical screw can better control the movement of the lift. 14) The invented apparatus of claim one can be used as a lift, crane, and elevator for carrying people or for any other similar uses with or without cabin. |
COLUMN LIFT MECHANISM USING ROTATING SCREW
TECHNICAL FIELD OF THE INVENTION: The invitation is related for mechanical equipments including mechanical systems of movement transmission, load and power transfer systems in height, and movement structure of column lifts and rail lifts.
BACKGROUND OF THE INVENTION: Vertical Spring Lift registered by John Theis under the patent number US 8596591 is a disclosed column lift which uses a spiral system and a worm gear on the shell of this system. The internal part of the lift has a shaft, around which a steel strip is wrapped. The end of the strip is inserted into a vertical column upwardly, and at the highest point of the column, the direction of the spring is reversed and connected to a mobile truck moving on a vertical rail. When the steel strip extends due to spiral rotation, the lift moves downwards because of the weight of the truck. By contrast, when the strip is contracted, the moving truck goes upwards.
Load Lifting Mechanism is another invention registered by Gendreau Jacues at the United States Patent and Trademark Office (USPTO) under the patent number US 3687234 A. This lift uses disclosed screws rotating inside a vertical column. The nut mounted on it and connected with the main axes of the lift moves upwards and downwards inside the rail and moves the lift to the top point.
Another invention called Screw-Driven Elevator was filed for patent by Letz Emile Guillaume Joseph at the USPTO and registered under the number US 3468401 A is a lift which is equipped with a screw along the length of the lift and is positioned vertically. Lift system or lift cabin is connected to this screw by a nut, which is itself connected to an electromotor by a pulley and a belt. In case of necessity, the rotation of the motor causes the nut to rotate upwards or downwards. As the nut is connected to the cabin, it moves upwards or downwards by the movement of the nut.
Another invention filed for patent by Chester M. MacChesney and registered under No. US 3215227 A at the USPTO is a driving mechanism for lift systems and disclosed lifts, in which special rail in a spiral form which are indeed a sort of nut has been installed inside the entire lift pit or lift system to make it possible to move the cabin upwards. A helical screw has been mounted on the driving system and its end is connected to the starting point of the helical screw through in-door channel. The pitch of this screw is the same as the pitch of the rail. Therefore, it is possible to put metal balls between the spiral and the rail. This helical screw uses a spiral gear of 45-degree movement transmission system receives the required power from the motor. The position of the cabin on the adjacent rails and restricting its transversal movement helps to move upwards and downwards by the upward force created by the spiral rotation and movement of the balls between the screw and rail.
EXISTING PROBLEMS:
There are two main problems in the above-mentioned lifts: In most of them, the expansion of rail is limited or some constraints and accessories are required to control the total performance of the lift.
On the other hand, they cannot move heavy cargos and due to the special structure of the lift, it is required to use big and heaving parts to supply necessary force.
DESCRIPTION OF THE INVENTION: The methods used for the manufacture of the lifts can be classified into two main groups: The first method uses flexible elements such as steel belts or chain for movement. The change in direction can be carried out by a pulley in the upper part of the lift, regardless of the flexible elements. The second method uses rigid elements such as rack gear, screw, or different metal systems. In this invention, driving force is generated by the rotation of a screw inside the vertical column in toothed form like the shape of a nut. According to the figure 1, the driving force required for the lift (Part 1) which can be clockwise (CW) or counterclockwise (CCW). After reducing speed by gearbox and horizontal shaft (Part 2) using 25- degree gear mechanism, the electromotor changes direction and transfers its force to the central shaft existing in the center of two screws (Part 6) vertically and n the direction of lift column. Each screw has two bearings at its two ends which are connected to the cabin wall (Part 7) by metal rigid plates (Part 1).
In the vertical column, there are three or more rack gears (Part 4), which are positioned with the same angle to each other. The rack gears can be made of steel or any other strong and rigid materials. In addition, the rack gears are surrounded by a framework which can put the rack gears together and in with correct angle and distance. This framework has edges with rails to move the sliding wheels (Part 8). The major structure of this apparatus is just like the car lift. There is however an essential difference: in the common car lifts, the driving screw rotates and the nut remains fixed. This fixed nut is connected to the main chassis of the apparatus. The upward and downward movement of chassis nut causes the apparatus goes up and down. In this invention, the nut (toothed plates) is fixed and the screw as the driving element is connected to the chassis of the apparatus, and the upward and downward movement of the screw, the apparatus moves upwards and downwards.
In this invention, rail parts can be manufactured in form of small modules with definite length and put them together based on the place where the lift column is installed using common techniques including bolting, clinching, welding, or any other methods.
The advantage of this method is that as the nut is fixed, supports can be connected to any desired place. Therefore, the limits of the height existed in the previous ones.
BRIEF DESCRIPTION OF FIGURES:
Figure No. 1: shows the whole invention and the movement system of the lift.
Figure No. 2: shows the manner of installing the cabin on the column system of the lift. Figure No. 3: shows the parts of the cabin connected to the movement system. Figure No. 4: shows the form of placing the rails of the lift system.
Figure No. 5: shows the thickness of the connecting plates of the cabin.
Figure No. 6: shows the form of the major basic modules.
Figure No. 7: shows the position of the screw on the rack gears.