WO2008092986A1

WO2008092986A1 - Piston construction

Info

Publication number: WO2008092986A1
Application number: PCT/FI2008/000016
Authority: WO
Inventors: Jaakko Juhani Korhonen
Original assignee: Jaakko Juhani Korhonen
Priority date: 2007-01-31
Filing date: 2008-01-28
Publication date: 2008-08-07
Also published as: FI20070080A0; EP2126422A1

Abstract

Piston construction, which is intended to move backwards and forwards in a cylinder (1) and which comprises a piston (2) proper, which is attached in a fixed or movable manner to a guide (4) that lies essentially in the longitudinal direction of the cylinder. A movable weight (3) is also attached to the same guide (4). The cylinder (1) is mainly stationary while the piston (2) and the weight (3) are movable.

Description

Piston construction

The present invention relates to a piston construction and more specifically to a piston construction that is used in various devices operating in water.

Pistons are known for very many different purposes, there are combustion- engine pistons, pump pistons, and pistons for the most diverse other purposes. A general principle is that a piston is most usually intended either to move a medium, or, on the other hand, to move when pushed by a medium. A general principle of piston constructions is also that the piston usually moves in a cylinder or in a cylindrical structure and that it is sealed relative to the cylinder. Usually the cylinder and thus also the piston have a circular cross-section.

The present invention is intended to create a piston construction, which is intended to operate in water and which also comprises a piston proper, which moves in a cylinder. The intention is now, however, to create added value in a piston construction.

The above and other advantages and purposes of the present invention are achieved in the manner described as characteristic in the accompanying claims.

The invention is depicted very schematically in greater detail in the accompanying drawings, which show some constructions of the invention.

Thus:

Figure 1 shows a cross-sectioned side view of one alternative of the piston arrangement according to the invention;

Figure 2 shows the arrangement according to Figure 1 in a another operating position;

Figure 3 shows another alternative for the arrangement of the extension part of the cylinder; and

Figure 4 shows an alternative arrangement of the piston and guide.

The components in the arrangement according to Figure 1 are principally the following. The cylinder, which is mainly a cylindrical 'tube', is marked with the reference number 1. The piston 2 is fitted in a sealed manner in the cylinder 1. The guide rod 4 is positioned particularly in the centre of the cylinder relative to its cross-section and travels through the piston 2. The reference number 3 is used to mark a weight, the material of which is clearly denser than water. The reference number 6 marks the extension part of the cylinder, which is used when its use is sensible. Particularly when the weight moves extensively, the said extension part may be needed. It moves especially along with the weight 3.

As stated, this description of the invention is intended to be highly simplified, while nevertheless presenting the essential features. Thus it should be stated that the cylinder structures are primarily stationary, the guide being attached in fixed manner in the structures of the total device, but both the piston 2 and the weight move.

The piston construction is intended for operation in water and is particularly intended to operate in pairs in devices making a rotational motion around a specific pivot point, or a backwards-and -forwards motion. The operation is intended to be such that, on different sides of the aforementioned pivot point, the movement of the piston 2 and the weight 3 will bring the centre of gravity to different distances from the pivot point, thus causing the side that is farther from the pivot point to fall and the other to rise.

The reference number 1¹ marks an air chamber between the sealed piston 2 and the end of the cylinder. It is obvious that at least one pipe/hose, through which air can freely flow into and out of the chamber V according to the movement of the piston, leads into the chamber 1'. The reference number 7 is used to mark a chamber, in which there is the water, in which the piston/cylinder is submerged. The weight 3 is thus not sealed, but instead the water can flow into the chamber 7 from the environment and also out of the chamber. The joint between the piston 2 and the guide 4 is naturally also sealed.

The pressure of the surrounding water tends to push the piston from its initial position in Figure 1 towards the end of the cylinder, when the air exits the chamber 1' according to the movement of the piston. The final situation is shown in Figure 2, the piston being at its extreme position and the weight 3 too having moved left in the figure. On the other hand, the piston arrangement according to Figures 1 and 2 on the other side of the pivot point will have settled in the position according to Figure 1 , being now, of course, a mirror image of what is shown in Figure 1. This means that the centre of gravity is very strongly on the side of the end shown in the figures.

Figure 3 shows an alternative solution for the extension part. The wall of the cylinder 1 is now formed to be double and the extension part 6 goes between the double walls.

Figure 4 shows an alternative solution, in which the guide does not run through the piston, but is attached to it in a fixed manner. In all other ways, Figure 4 corresponds to the solutions shown in Figure 1 and 2.

The figures do not show the means for moving the weight 3, nor the locking means, by which the position of the piston and weight relative to the guide 4 is locked if necessary.

The invention described above can be varied in many ways. The shapes and relative dimensions can be other than those shown. The total device can include other components as additions. One such is an additional weight, with the aid of which the control event is controlled, if this is required.

The cylinder 1 can have adjustable body structures, particularly in the case of its longitudinal axis. Above, reference has been made only to water, but, as can be easily understood, the liquid can be other than water, if desired.

Claims

1. Piston construction, which is intended to move backwards and forwards in a cylinder (1) and which comprises a piston (2) proper, characterized in that the piston is attached in a fixed or moveable manner to a guide (4) that lies essentially in the longitudinal direction of the cylinder, which is equipped with an extension part (6), while a moveable weight (3) is also attached to the same guide (4).

2. Construction according to Claim 1 , characterized in that the cylinder (1) is fixed and the piston (2) and weight (3) are moveable.

3. Construction according to Claim 1 , characterized in that the piston (2) is sealed relative to the cylinder (1), thus forming an air chamber (1') with a capacity varying according to the movements of the piston, on the side facing the end of the cylinder.

4. Construction according to any of the above Claims, characterized in that it is intended to operate in water.