EP2514493A1 - Sportball-Druckbehälter - Google Patents

Sportball-Druckbehälter Download PDF

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Publication number
EP2514493A1
EP2514493A1 EP11163613A EP11163613A EP2514493A1 EP 2514493 A1 EP2514493 A1 EP 2514493A1 EP 11163613 A EP11163613 A EP 11163613A EP 11163613 A EP11163613 A EP 11163613A EP 2514493 A1 EP2514493 A1 EP 2514493A1
Authority
EP
European Patent Office
Prior art keywords
pressure
container
inflation
balls
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11163613A
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English (en)
French (fr)
Inventor
Douwe Johannes Monsma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Monsma Research BV
Original Assignee
Monsma Research BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Monsma Research BV filed Critical Monsma Research BV
Priority to EP11163613A priority Critical patent/EP2514493A1/de
Priority to PCT/EP2012/057267 priority patent/WO2012143509A1/en
Publication of EP2514493A1 publication Critical patent/EP2514493A1/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B39/00—Hollow non-inflatable balls, i.e. having no valves
    • A63B39/02—Arrangements for maintaining the pressure
    • A63B39/025—Arrangements for maintaining the pressure using containers with pressurising means for balls not in use

Definitions

  • the present invention relates to a sports ball pressurizing container, and to a method of pressurizing sports balls.
  • the present invention relates to pressurized sports balls.
  • Sports balls are generally made of rubber and pressurized with air or nitrogen to about 2 bar. After manufacture sports ball may be placed in a pressurized plastic can to prevent air loss from the balls as the rubber is permeable to gas. Prior to usage, this can is opened. From that moment, the sports balls lose gas and pressure. Balls can generally be used for 1 month of play when stored at ambient pressure. Already during this period, the bounciness of these balls decreases. This becomes especially noticeable when playing with a mix of old and new balls, which results in a large difference of bounce.
  • New balls with proper pressure may be hit many meters farther with the same hit as a "dead" ball that may have an internal pressure of only 1 to 1.5 bar that end up in the net. This leads to frustration during an otherwise great game.
  • Mixing of old and new balls is especially a problem for tennis trainers, who usually teach with a cart and a crate with larger numbers of balls, for instance 150 balls. Frequent ball replacement to avoid this pressure problem is costly and may be challenging to the environment. Balls may be stored at 2 bar pressure to prevent pressure loss but since trainer tennis balls are used daily for many hours, during which they are exposed to ambient pressure, they still lose pressure quickly.
  • US 3888347 discloses a ball container with an integrated pump.
  • US 4046491 discloses an apparatus for preserving the ball pressure during storage.
  • US 4101029 discloses a container with gas supply, a pressure gauge, and a pressure release valve.
  • US 4729472 relates to a monitoring device for recording and displaying the times the tennis balls have been used.
  • US 5002196 discloses a container with a compressor, a pressure sensor switch and optionally a manually operable pressure release valve.
  • US 5083415 describes pressurizing a container with a piercing probe and subsequently heat-sealing the piercing.
  • US 5397018 discloses a storage container with a pressure compensation device for controlling a compressor as well as a player's container that can be provided with a hand pump, a pressure control valve and a pressure meter.
  • US 7658211 discloses a container that can be pressurized with CO2.
  • the present invention relates to sports ball pressurizing container comprising a sealable opening and a pressure control system that comprises means to pressurize the container and a time-controlled pressure release means.
  • a inflation system with a time controlled pressure release valve.
  • the container comprises a pressure control system that comprises an electronic control unit, a gas supply to pressurize the container, a time keeping device, a time-controlled pressure release valve, a pressure gauge, and a user interface.
  • the time-controlled pressure release means is connected via an electronic control to an electronic time keeping device.
  • the electronic control unit has electronic connections for data receiving of the time keeping device, the pressure gauge, and the user interface, and wherein the electronic control unit has electronic connections for data providing with the means to pressurize, the time-controlled pressure release means and the user interface; and wherein the container has a gas inflow connection with the means to pressurize and a gas outflow connection with the pressure gauge, the time-controlled pressure release means and the safety release valve; and wherein the container has closure means that provides for a physical closure connection between the container and the lid to seal the container interior.
  • the electronic control unit has electronic connections for data receiving with the means to pressurize, the time keeping device, the pressure gauge, the user interface and the closing sensor, and wherein the electronic control unit has electronic connections for data providing with the means to pressurize, the time-controlled pressure release means and the user interface; and wherein the container has a gas inflow connection with the means to pressurize and a gas outflow connection with the pressure gauge, the time-controlled pressure release means and the safety release valve; and wherein the container has closure means that provides for a physical closure connection between the container and the lid to seal the container interior.
  • the opening is sealed with a door and a rubber seal and wherein the rubber seal is bonded to the door and/or to the container.
  • the present invention further relates to a method of pressurizing at least partially deflated sports balls by:
  • the time keeping device measures the time period t ambient during which the balls with original internal ball pressure p original are exposed to ambient pressure p ambient .
  • the inflation pressure differential corresponds to the deflation pressure differential (p original - p ambient ).
  • the inflation time period t inflation corresponds to the deflation time period t ambient .
  • the pressure is lowered to the original internal ball pressure p original .
  • the pressure supply is temporarily interrupted, the pressure in the container is monitored with the pressure gauge and the electronic control unit triggers an alarm when the pressure drops at a rate of at least 0.01 bar/min.
  • the sports balls are pressurized by the following steps:
  • containers according to the present invention allow for proper pressurization of sports balls, even mixtures of old and new balls.
  • the invention provides a convenient and flexible way of repressurization of sports balls. Sports players will benefit in that they will less frequently be confronted with "dead” balls amongst the sports balls that they are playing with.
  • the invention allows sports balls to be pressurized in batches and to similar internal pressures even mixed batches of old and new balls.
  • the present invention further allows for maintenance of relatively constant pressurization of sports balls over time, each ball individually but also the sports balls as a batch, contributing to enjoyable play over longer periods.
  • Figure 1 is a schematic representation of a preferred embodiment of the container of the present invention.
  • Figure 2 is a schematic representation of a preferred embodiment of the container according to the present invention.
  • Figure 3 is a schematic representation of a preferred electronic control scheme that may be used in the present invention.
  • Figure 4 is a schematic representation of a preferred flow chart that may be used in the present invention.
  • the unit of pressure is bar absolute which may also be referred to as bara or according to this invention bar.
  • Bar absolute is zero-referenced to complete vacuum. 1 bar is equal to 100 kPa and to 0.987atm.
  • Another unit of pressure are pound-force per square inch or psi. 1 bar is equal to approximately 14.5psi.
  • the invention relates to a sports balls pressurizing container.
  • balls without inflation valve are tennis balls, squash balls, and racketball balls.
  • the present invention relates to tennis balls.
  • the sports balls are made of rubber, more preferably the sports balls have a fabric coating.
  • the container pressurizes one or more sports balls in its interior.
  • a batch of multiple balls is pressurized at the same time in the container interior, preferably at least 3, more preferably at least 10, and preferably at most 10000, for instance between 10 and 500, or around 150 sports balls.
  • the balls are put in a bag to contain dirt, gravel and ball fibers inside the bag.
  • the bag is open to allow for pressure adjustment inside the bag.
  • the sports ball container of the invention comprises a closing means which is preferably a lid or a door.
  • the closing means comprise a hinge.
  • the container comprises a closure sensor (interlock safety sensor).
  • the invention in another aspect, relates to a container, and particularly a sports ball container, comprising a sealable opening which is preferably sealed with a closing means.
  • Pressure containers of the prior art use O-ring seals or clamped seals, but we have found that usage of such seals may lead to pressure leakage leading to frequent seal replacement.
  • pressure leakage may be reduced by bonding the seal to the door and/or to the container. It reduces the number of mechanical contact interfaces to just one interface, and allows for much easier cleaning prior to closing the container.
  • Such contamination may be introduced by the sports balls loading in and unloading from the container interior.
  • the invention may prevent such contamination in the first place.
  • the invention may lead to a cleaner seal, resulting in less leakage, a better functioning container and better pressurized sports balls.
  • the seal according to this aspect of the invention is bonded to the door, to the container, or to both.
  • one seal may be bonded to the door while the other seal may be bonded to the container.
  • the seal is made of rubber.
  • the bonded seal is used for sports ball containers. We have found that such a bonded seal is surprisingly effective for pressurizing balls in a container.
  • the bond is created by using an adhesive that bonds the seal and the underlying surface of the door, the container, or both (in case of two seals).
  • an adhesive is applied or in the alternative, first a primer is applied, then a non-vulcanized rubber is applied and subsequently the rubber seal is vulcanized.
  • the invention relates to a container comprising a pressure control system that comprises means to pressurize the container and a time-controlled pressure release means.
  • the pressure control system comprises an electronic control unit, also called an ecu.
  • the pressure control system comprises a time keeping device.
  • the pressure control system comprises a pressure gauge.
  • the pressure control system comprises a safety release valve.
  • the pressure control system comprises a user interface.
  • the pressure control system may further comprise tubing, cables for electronic data exchange, and a closure sensor.
  • the means to pressurize the container is by reduction of the interior space of the container, by increase of the gas content of the container, or by a combination thereof.
  • the interior space may be reduced by moving one or more of the walls of the containers inwards, for instance by screwing a cap on a container.
  • the means to pressurize the container is a gas supply, using a pressurized gas tank, or more preferably a compressor or hand pump, most preferably a compressor.
  • the gas used in the present invention is Nitrogen or air, more preferably air.
  • the time-controlled pressure release means increases the interior space of the container, decreases the gas content of the container, or a mixture thereof.
  • the interior space may be increased by moving one or more of the walls of the containers outwards, for instance by unscrewing a cap from a container.
  • the time-controlled pressure release means is a valve.
  • the means is electronic.
  • the means is automatic.
  • the pressure is reduced by opening the valve and releasing the gas until a programmed pressure has been measured with the pressure gauge.
  • the ecu comprises one or more microcontrollers with embedded software (i.e. a programmed microcontrollers), preferably including stored algorithms for use in the present invention.
  • the ecu provides the central processing and control unit of the electronic data for receiving and sending data in order to manage the pressurization of the container interior, for instance by recording, setting, maintaining, adjusting and/or terminating the pressurization of the container interior.
  • Power supply may contain universal line (110V/220V) power adaptor, or may be a battery.
  • the time keeping device is electronic and preferably automatic.
  • the time keeping device measures the time for instance in units of seconds, minutes or hours.
  • a preferred time keeping device is a clock.
  • the clock may be analogue, digital, mechanic and/or electronic and is preferably electronic.
  • the time keeping device is driven by a quartz crystal, a source of a time base.
  • the pressure gauge is an electronic gauge, allowing for convenient interfacing with the ecu.
  • the safety release valve prevents pressure of the container interior to exceed a maximum pressure value. At higher pressures, the safety release valve will open and release the pressure.
  • the closure sensor is located in the sealing device and/or hinge bracket and registers whether the container is physically closed and/or sealed.
  • the tubing allows for passage of gas for pressurizing and/or pressure release of the container interior.
  • cable wiring connects the various elements of the container and the pressure control system to allow for electronic data exchange between the elements.
  • the user interface comprises a display and control buttons.
  • the control buttons include a start button.
  • the control buttons include a button for setting factor k as indicated below.
  • the container of the invention has the following electronic connections, physical connections and/or flow connections.
  • the ecu is electronically connected to the means to pressurize to provide input on supplying pressure to the container and to the time-controlled pressure release means to provide input on releasing pressure from the container.
  • the ecu is electronically connected to the time keeping device to receive input on the time.
  • the ecu is electronically connected to the pressure gauge to receive input on the pressure in the container.
  • the ecu is electronically connected to the user interface to receive input from the control buttons and to provide input to the display on the status of the container for instance on pressure and time.
  • the ecu is electronically connected to the closing sensor to receive input on the physical closure of the container.
  • the ecu is electronically connected with a power supply.
  • the means to pressurize the container is electronically connected to the ecu and has a flow connection, preferably through tubing, with the container to provide pressurization, preferably by providing a gas flow.
  • the time controlled pressure release means is electronically connected to the ecu and has a flow connection, preferably through tubing, with the container to release pressurization from the container.
  • the pressure gauge is electronically connected to the ecu and has a flow connection, preferably through tubing, with the container to measure the pressure in the container interior.
  • the safety release has a flow connection with the container and is able to autonomously release overpressure from the container interior.
  • the closure means provides for a physical closure connection between the container and the door to close off the container interior and an electronic connection with the ecu to provide input to the ecu on the closure status of the door.
  • the container comprises a time controlled pressure release means. Based on the time input from the time keeping device, on the container pressure input from the pressure gauge, the ecu provides electronic input to the time controlled pressure release means and controls the release of pressure from the container.
  • the invention allows for precise pressurization of sports balls based on precise timing of pressure release as determined by the ecu based on various input including the time keeping device, the pressure gauge, the closing means, and the user interface.
  • the invention relates to a method of pressurizing at least partially deflated sports balls by:
  • Sports balls in step (i) may for instance be retrieved from a pressured new ball can or for instance from the pressurization container after inflation.
  • the ecu preferably receives input from the closure sensor on container closure, from the control buttons on the user interface, and from the pressure gauge on the pressure in the container interior and provides input to the means to pressurize the container to provide gas supply to the container interior through the tubing.
  • the ecu receives input from the time keeping device on the time and from the pressure gauge on the container interior pressure and provides input to the time controlled pressure release means to lower the pressure in the container interior. Meanwhile, the ecu provides electronic data on the status of the method to the display on the user interface.
  • the time keeping device and ecu monitor the ambient time period t ambient during which the sports balls are exposed to ambient pressure p ambient . This occurs during step (iii).
  • the time keeping device provides the ecu with the time - time a - when the pressure gauge provides electronic data to the ecu that the pressure in the container has dropped below 1.5 bar which occurs shortly after the user has instructed the container to vent.
  • the time keeping device provides the ecu with the time - time b - when the pressure gauge provides electronic data to the ecu that the container pressure has reached above 1.5 bar which occurs shortly after the user presses the start button on the control buttons of the user interface. From the difference in time (b-a), the ecu determines the ambient period time t ambient .
  • the ambient pressure p ambient may be measured using a pressure gauge or estimated, for instance at 1 bar. Usually, p ambient is around 1 bar, at atmospheric pressure.
  • the balls of a batch have similar or equivalent original internal ball pressure p original , although this is not essential for the invention.
  • the original internal ball pressure p original is known, from ball factory settings, but it may also be measured or estimated.
  • the p original of tennis balls is generally between 1.5 and 2.2 bar, for instance around 2 bar.
  • the means to pressurize the container subjects the balls to a inflation pressure p inflation that is higher than the original internal ball pressure p original of the balls.
  • inflation pressure p inflation is preferably applied during above steps (ii) and (iii).
  • the inflation pressure p inflation is monitored with the pressure gauge.
  • the time keeping device and ecu monitor and determine the inflation time period t inflation , starting from the time that the container has reached p inflation at the beginning of step (iii) and until the time-controlled pressure release means starts lowering the pressure at the end of step ii).
  • the pressure gauge provides electronic data to the ecu that the inflation pressure p inflation has been reached.
  • the ecu registers the time - time c - as provided by the time keeping device.
  • the ecu determines, preferably with any of its algorithms (and more preferably using the algorithm as provided below) the inflation time period t inflation . With time input from the time keeping device, the ecu registers the time period of time c + t inflation and instructs the time-controlled pressure release means to release the pressure from the container interior.
  • the present invention relates to a time-controlled pressure release means which, by monitoring the pressurization time, allows for precise pressurization of sports balls.
  • sports balls are pressurized to their original internal pressure p original or sometimes - but less preferred - close to their original internal pressure.
  • the time controlled pressure release means is preferably controlled by the ecu and releases the pressure based on the instructions from the ecu which works in conjunction with the other devices as indicated.
  • the pressure in the container is preferably lowered to the original internal ball pressure p original for storage of the sports balls. This occurs in above step (iv).
  • factor k can be determined by the user with the buttons on the user interface to customize the internal pressure of the sports ball. This factor can be determined empirically. If the user chooses factor k equals 1, then the sports balls will be inflated to the previous original ball pressure p original , a lower value for k leads to softer balls while a higher value for factor k leads to harder balls.
  • the user can take other aspects such as court type, personal preference, weather and altitude into account when deciding on the ball pressure. For instance, on hardcourt, tennis balls often lose felt and become faster. Under such circumstances, factor k may be set to a value less than 1. If a trainer finds after several weeks of play that the balls become too fast, he can decrease the setting of factor k on the user interface. On the other hand, on other types of courts the tennis ball felt may become fluffy, slowing down the ball due to excess wind resistance. Under such circumstances, factor k may be set larger than 1.
  • a sports ball or a set of sports balls is generally exposed to p ambient for less than 24 hours, therefore allowing for repressurization during the remainder of the day, during the night, or even in the subsequent days.
  • the inflation pressure p inflation in the container is at least 2.3 bar, more preferably at least 2.5 bar and preferably at most 5 bar and more preferably at most 4 bar.
  • inflation pressure differential (p inflation - p original ) is equal to the deflation pressure differential (p original - p ambient ).
  • the inflation time period t inflation is set such to correspond to the deflation time period t ambient .
  • p inflation is preferably kept low to allow for a lower cost pressure tank and compressor and to prevent collapse of the sports ball under inflation pressure.
  • An important aspect of this invention is that the balls are reinflated preferably every night so that the ball has sufficient remaining pressure to prevent collapse under inflation pressure.
  • the inflation time period t inflation is at least 1 hours, more preferably at least 3 hours, and preferably at most 24 hours and more preferably at most 12 hours.
  • the time the sports balls are in play is shorter than 12 hours.
  • a preferred inflation pressure is around 3 bar, as this provides an inflation pressure differential of 1 bar which is equal to the deflation pressure differential (of about 2 bar p original minus 1 bar p ambient ) and the inflation time period t inflation can be kept at the same length as the ambient time period t ambient during which the balls were exposed to ambient pressure p ambient .
  • the sports balls are preferably stored at p original to optimize internal sports ball pressure. For simplicity 2 bar may be used as an example.
  • a preferred method according to the invention relates to a method of pressurizing at least partially deflated sports balls by:
  • the method of the invention may also provide for the option of opening the container before the inflation time period t inflation has ended, for instance when the sports balls are needed in another unexpected game challenge. In that case, the remaining inflation time may be added to the next inflation time, of course adjusting for any differences in inflation pressures p inflation and using the algorithm provided.
  • the present invention provides for proper inflation of sports balls, also covering a mix of old and new balls.
  • old balls may generally deflate quicker as gas diffuses faster through the worn-out rubber of the ball as compared to new balls.
  • old balls may generally inflate more quickly as well because gas diffuses after through the worn-out rubber into the ball as compared to new balls.
  • mixes of old and new balls may be properly inflated with the present invention.
  • the present invention relates to a method of monitoring pressure leakage from a container wherein the container is pressurized, the pressure supply is temporarily interrupted, the pressure in the container is monitored with a pressure gauge and an alarm is triggered when the pressure drops at or above a certain rate.
  • an ecu triggers the alarm.
  • the rate of pressure drop is at least 0.01 bar/min, more preferably at least 0.05 bar/min.
  • the pressure supply is interrupted for a period of at least a few seconds, more preferably 30 seconds and preferably at most 5 minutes, more preferably at most 2 minutes, for instance 1 minute.
  • a tennis teacher starts at 9 am (time a) with the opening of the container that was pressurized at a storage pressure of 2 bar which is equivalent to the original ball pressure p original .
  • the container Before opening, the container first depressurizes using the pressure release valve to ambient pressure p ambient of 1 bar (atmospheric pressure).
  • the ecu in combination with the time keeping device registers a time of 9am when the pressure gauge indicates 1 bar.
  • the teacher removes the sports balls and replaces them in the container at the end of the day at 5pm (time b). He closes the lid and presses the start button on the user interface.
  • the ecu registers through the pressure gauge that the pressure in the container has reached 1.5 bar and registers the end of ambient time period t ambient .
  • the teacher sets factor k to 1.
  • the ecu instructs the pressurizing means to increase the pressure of the container to an optimal inflation pressure p inflation of 3 bar considering that inflation pressure differentials (p inflation - p original ) and deflation pressure differential (p original - p ambient) are equal to prevent effects of non-linearity in the permeability.
  • the ecu instructs, under guidance from the time keeping unit, the time controlled release means to release pressure at 1am the next day to the storage pressure p original of 2 bar. The next day, the tennis teacher can again use properly inflated balls for an enjoyable tennis training.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Measuring Fluid Pressure (AREA)
EP11163613A 2011-04-22 2011-04-22 Sportball-Druckbehälter Withdrawn EP2514493A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11163613A EP2514493A1 (de) 2011-04-22 2011-04-22 Sportball-Druckbehälter
PCT/EP2012/057267 WO2012143509A1 (en) 2011-04-22 2012-04-20 Sports ball pressurizing container

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11163613A EP2514493A1 (de) 2011-04-22 2011-04-22 Sportball-Druckbehälter

Publications (1)

Publication Number Publication Date
EP2514493A1 true EP2514493A1 (de) 2012-10-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP11163613A Withdrawn EP2514493A1 (de) 2011-04-22 2011-04-22 Sportball-Druckbehälter

Country Status (2)

Country Link
EP (1) EP2514493A1 (de)
WO (1) WO2012143509A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100307637A1 (en) * 2007-06-19 2010-12-09 Dirst William F Apparatus for recharging tennis balls and method
WO2014147276A1 (es) * 2013-03-20 2014-09-25 Ruiz Contreras Angel Aparato recuperador de presión para pelotas y procedimiento para llevar a cabo dicha recuperación

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888347A (en) 1973-08-06 1975-06-10 Thomas Rollin Kramer Inflated containers for fluid pressurized balls
US4046491A (en) 1976-01-22 1977-09-06 Roeder Malcholm O Tennis ball preserver
US4101029A (en) 1977-09-29 1978-07-18 Feinberg Robert S Tennis ball rejuvenator and maintainer
US4729472A (en) 1986-07-02 1988-03-08 Martin Lubin Use-monitoring closure for tennis ball cans
US5002196A (en) 1989-10-20 1991-03-26 John Bassili Pressure vessel with removable sealing lid
US5083415A (en) 1990-10-29 1992-01-28 Schneider Hubert A Method for sealing tennis ball container and container so sealed
US5397018A (en) 1992-06-10 1995-03-14 Mader; Paul-Joachim Tennis ball handling system
US7658211B1 (en) 2007-06-19 2010-02-09 Dirst William F Tennis ball recharging apparatus method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888347A (en) 1973-08-06 1975-06-10 Thomas Rollin Kramer Inflated containers for fluid pressurized balls
US4046491A (en) 1976-01-22 1977-09-06 Roeder Malcholm O Tennis ball preserver
US4101029A (en) 1977-09-29 1978-07-18 Feinberg Robert S Tennis ball rejuvenator and maintainer
US4729472A (en) 1986-07-02 1988-03-08 Martin Lubin Use-monitoring closure for tennis ball cans
US5002196A (en) 1989-10-20 1991-03-26 John Bassili Pressure vessel with removable sealing lid
US5083415A (en) 1990-10-29 1992-01-28 Schneider Hubert A Method for sealing tennis ball container and container so sealed
US5397018A (en) 1992-06-10 1995-03-14 Mader; Paul-Joachim Tennis ball handling system
US7658211B1 (en) 2007-06-19 2010-02-09 Dirst William F Tennis ball recharging apparatus method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100307637A1 (en) * 2007-06-19 2010-12-09 Dirst William F Apparatus for recharging tennis balls and method
US8627859B2 (en) * 2007-06-19 2014-01-14 Rebounces, Llc Apparatus for recharging tennis balls and method
WO2014147276A1 (es) * 2013-03-20 2014-09-25 Ruiz Contreras Angel Aparato recuperador de presión para pelotas y procedimiento para llevar a cabo dicha recuperación

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