DE3347166A1 - Container having a device for producing a superatmospheric pressure in which balls (e.g. tennis balls) can be stored - Google Patents

Abstract

Due to the pressure difference, tennis balls stored in the atmosphere lose their internal pressure. If, in contrast, the balls are stored in the pressure container according to the invention, the pressure difference is eliminated by producing a superatmospheric pressure. The invention is thus a container, preferably made of plastic, in which a superatmospheric pressure can be produced without additional aids, such as an air pump or compressor. When the tennis balls have been placed in the lower part (1), the lid (2) used as a piston is pulled axially downwards over a sealing ring (4) with the aid of a mechanism (3). Due to the stroke movement of the lid (2), the volume is reduced from VI to VII, and the internal pressure of the container thus rises analogously from pI to pII. Due to the design and calculation of the two volumes, a particular superatmospheric pressure can thus be produced which corresponds approximately to the internal pressure of a ball. If, for particular reasons, the container pressure pII (Figure II) specified in the design is to be increased further in an existing container (e.g. for other types of balls), the initial volume VI can be reduced with the aid of correspondingly dimensioned inserts, as illustrated in Figure III, in such a way that the desired increased internal pressure pIII with the associated volume VIII is obtained after the enclosed air has been compressed. This internal pressure is thus ... Original abstract incomplete. <IMAGE>

Description

Container with integrated air compression device for

careful storage of inflated balls - preferably tennis balls.

The invention is based on an easy-to-use pressure vessel for air compression for tension-free storage of tennis balls, in which the lid of the container is designed as a reciprocating piston, which when pressed together compresses the air in the container.

With the help of this container it is possible to pressurize tennis balls to be stored in order to increase their service life. The generated overpressure corresponds to roughly the internal pressure of a ball.

When used correctly, the balls should always be in this pressure vessel kept and only taken out for the time of playing. This will the pressure loss of the balls caused by the pressure difference during normal storage the atmosphere occurs, and the use time of the balls is thus avoided considerably extended. Because with tennis balls that are exposed to atmospheric pressure the rubber of the balls is constantly under tension due to the increased internal pressure and therefore tends to crack.

In the case of unprotected balls in the atmosphere, increases in Temperature increase of the internal pressure of the balls approximately after the isochoric change of state proportional to the temperature. This additional pressurization the diffusion process is accelerated.

If, on the other hand, the balls are stored in the pressure vessel according to the invention, so the above Temperature influence on the balls switched off. Because when the temperature changes the pressure changes uniformly both in the balls and in the container.

The pressure difference remains constant when exposed to temperature "Zero".

Tennis balls kept in the pressure vessel described below meet the provisions of the Federation International de Lawn Tennis, which has a rebound height between 13476 cm and 147.3 cm from a drop height of 254 cm on a concrete slab.

The invention is a container, preferably Made of plastic, with the lower part (1) for holding tennis balls. After inserting the tennis balls into the lower part (1), it is used as a piston Cover (2) axially downwards with the aid of a mechanism (3) over a sealing ring (4) drawn. The stroke movement of the cover (2) reduces the volume of V1 to VII, and the internal pressure of the container rises analogously from PI to PII after isothermal change of state, whereby the thermal state variables according to the Boyle-Mariotte PI's Law. VI = PII. VII change.

The increased internal pressure pII is thus calculated using the formula: PII = PI. VI VII Through the constructive and arithmetical interpretation of the two volumes VI and V11 a certain overpressure can be generated, which is approximately the internal pressure of a ball.

An O-ring seal is used as a seal between the lower part and the cover made of the material Perbunan, which maintains the pressure level for a very long time guaranteed.

The pressure vessel described is shown with four tennis balls. But you can also imagine other variants with fewer or more balls.

If you want to use the existing container for certain reasons Further increase the tank pressure pII (Figure II) determined by the design (e.g. at other ball types), one can determine the initial volume VI with the help of appropriately dimensioned Fill pieces, as shown in Figure III, reduce so that one after Compression of the trapped air creates the desired increased internal pressure PIII with the associated volume VIII.

This internal pressure is therefore reduced by that caused by the filler pieces Volume larger.

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Claims (3)

Claims 1. Easy-to-use pressure vessel for receiving of inflated balls - preferably tennis balls - in which an overpressure for tension-free Storage with simultaneous relief of the rubber material of the balls are generated can. The overpressure corresponds roughly to the internal pressure of a tennis ball. 2. Pressure vessel according to claim 1, characterized in that the volume to generate the overpressure through a cover used as a piston by means of a Mechanics is reduced. An O-ring seal is used to seal off the atmosphere. 3. Pressure vessel according to claim 1 and 2, characterized in that when using the same tank, the tank pressure determined by the design Inserting filler pieces between the balls can be increased.