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Device and method for adjusting a force applied to a movable element

Imported: 24 Feb '17 | Published: 06 Jan '04

Ronald Henry Boucher, Raymond Alphonse Hebert

USPTO - Utility Patents

Abstract

A method for adjusting a first force applied to a movable element in a first position of the movable element by a force applying device, the force applying device applying a second force to the movable element in a second position of the movable element. The method includes connecting the movable element and a base element with a scissors-type linkage; mounting the force applying device to the scissors-type linkage at a first mounting point; mounting the force applying device to the base element at a second mounting point; and moving at least one of the first and the second mounting points along a constant force curve, so that the second force remains constant as the first force is adjusted. A device for adjusting a first force applied to a movable element in a first position is also provided.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

A preferred embodiment of the present invention is described below by reference to the following drawings, in which:

FIG. 1 shows a schematic side view of a prior art device for lifting a platform, in which the platform is in a lower position;

FIG. 2 shows a schematic side view of a prior art device for lifting a platform, in which the platform is in an upper position;

FIG. 3 shows a schematic side view of the device for adjusting a force applied to a platform according to the present invention, in which the mounting point of a gas spring is movable along a constant force curve;

FIG. 4 shows a schematic side view of the device of FIG. 3, in which the mounting point of the gas spring is movable along a one of two constant force curves;

FIG. 5 shows a schematic side view of the device of FIG. 3, in which the mounting point of the gas spring is movable along an approximated constant force curve;

FIG. 6 shows a schematic side view of the device for independently adjusting two forces applied to a platform according to the present invention, in which the mounting points of a first and a second gas spring are movable along constant force curves;

FIG. 7 shows a detailed schematic side view of a mounting point of the gas spring, in which the mounting point includes a mounting plate;

FIG. 8 shows a detailed schematic side view of a mounting point of the first gas spring, in which the constant force curve is approximated;

FIG. 9 shows a detailed schematic side view of a mounting point of the second gas spring, in which the constant force curve is approximated.

Claims

1. A method for adjusting a first force applied to a movable element in a first position of the movable element by a force applying device, the force applying device applying a second force to the movable element in a second position of the movable element, comprising the steps of:

2. The method as recited in claim 1,

3. The method as recited in claim 2,

4. The method for independently adjusting a first and a fourth force applied to a platform, comprising the steps of:

5. A device for adjusting a first force applied to a movable element, comprising:

6. The device as recited in claim 5,

wherein the movable element is a platform, the first position is an upper position and the second position is a lower position.

7. The device as recited in claim 6,

wherein the platform is a liftable working platform of a printing press and the base element is part of an operation deck of the printing press.

8. The device as recited in claim 5,

wherein the scissors-type linkage includes at least two pairs of scissors legs, each scissors leg being connect at one end to one of the platform and the base element.

9. The device as recited in claim 5,

wherein the force applying device is one of a gas spring, a coil spring, an air cylinder, a pneumatic cylinder or a hydraulic cylinder.

10. The device as recited in claim 5,

further comprising means for moving one of the first and second mounting points along the constant force curve.

11. The device as recited in claim 10,

wherein the means for moving one of the first and second mounting points include a mounting element movable along a curved slot.

12. The device as recited in claim 11,

wherein the curved slot corresponds to the constant second force curve.

13. The device as recited in claim 12,

14. The device as recited in claim 10,

15. The device as recited in claim 5, further comprising:

16. A device for adjusting a first force applied to a movable platform of a printing press, comprising:

17. A printing press comprising a device for adjusting a first force applied to a movable element, the device including:

18. A printing press comprising a device as recited in claim 16.