EP0136295B1 - Installation for the transport of tennis balls - Google Patents

Installation for the transport of tennis balls Download PDF

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Publication number
EP0136295B1
EP0136295B1 EP84900702A EP84900702A EP0136295B1 EP 0136295 B1 EP0136295 B1 EP 0136295B1 EP 84900702 A EP84900702 A EP 84900702A EP 84900702 A EP84900702 A EP 84900702A EP 0136295 B1 EP0136295 B1 EP 0136295B1
Authority
EP
European Patent Office
Prior art keywords
ramp
wall
covering
pct
balls
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.)
Expired
Application number
EP84900702A
Other languages
German (de)
French (fr)
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EP0136295A1 (en
Inventor
Werner Salansky
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.)
Stabeg Apparatebau GmbH
Original Assignee
Stabeg Apparatebau GmbH
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 Stabeg Apparatebau GmbH filed Critical Stabeg Apparatebau GmbH
Publication of EP0136295A1 publication Critical patent/EP0136295A1/en
Application granted granted Critical
Publication of EP0136295B1 publication Critical patent/EP0136295B1/en
Expired legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B47/00—Devices for handling or treating balls, e.g. for holding or carrying balls
    • A63B47/02—Devices for handling or treating balls, e.g. for holding or carrying balls for picking-up or collecting
    • A63B47/025—Installations continuously collecting balls from the playing areas, e.g. by gravity, with conveyor belts

Definitions

  • the invention relates to a system for conveying tennis balls, with an at least approximately perpendicular baffle and a collecting channel arranged at the foot of the balls, to which a ramp with a rising and a falling area adjoins the playing field, baffle or ramp are designed to absorb bumps.
  • Systems of this type as can be seen, for example, from EP-A-0 043 886, have the purpose of collecting the balls hit by a player against the vertical baffle or the ramp and feeding them to a conveying device which transports them to a container.
  • a ball throwing machine is usually connected to this container.
  • the object of the invention is to ensure in such a device that balls hit against the baffle spring back from the wall with as little residual energy as possible, so that they are not thrown back over the ramp into the field, but are directed from the suitably designed ramp into the collecting trough .
  • the device proposed to solve the problem shows a certain similarity to DE-A-1 428 841.
  • a cover attached to a frame by means of springs which, however, does not slow down the tennis ball, but on the contrary throws it back onto the playground and thus simulates a kickback of the ball by an opponent.
  • the baffle and / or at least a portion of the ramp has a covering which is only attached to a pair of parallel, horizontal and normal to the direction of the playing field edge strips of a frame and that the edge strips a rectangular connecting side pieces of the frame consisting of telescoped pieces of pipe strive apart under the pressure of springs arranged therein.
  • the width of the halls for which the system according to the invention is to be used fluctuates within wide limits, it makes sense to manufacture both the baffle walls and the ramps in sections of constant length which can be strung together. Since the ramp and the baffle in this case are interrupted several times by side parts under spring pressure, it is recommended that the covering encompasses the outer edge of the edge strips, which lies in front of the level of the side parts. This prevents the tarpaulin from resting on the side parts under spring pressure and balls from these areas bouncing back into the field undamped.
  • the arrangement according to the invention essentially consists of an at least approximately vertical baffle wall 2 carried by stands 16, which, like the ramp 5 composed of an ascending area and a descending area 4, is provided with a covering 1.
  • This covering runs between edge strips 6 and 6 ', which are held at a distance by telescopically pushed side parts 8, 8'.
  • a joint 10 holds the ramp 5 in the position shown, so that a collecting channel 22 is formed between the ramp 5 and the baffle wall 2.
  • the tennis balls 17 in the present exemplary embodiment are conveyed by a screw conveyor 11 to an output housing 23, into which they are individually introduced by a paddle wheel 14.
  • This paddle wheel 14 is driven by means of a transmission gear 25 from the same motor 12 as the screw conveyor 11.
  • From the outlet housing 23, the tennis balls 17 are pressed by a blower 13 into the hose 15, through which they lead to the collecting container, not shown, for example. a ball throwing machine.
  • baffle 2 and ramp 5 are composed of individual parts of constant width, which makes the entire system easy to transport and can also be assembled in different widths from prepared elements.
  • a single conveyor is sufficient to transport the tennis balls 18.
  • the screw conveyor 11 is to be provided with coupling points 31, which allow it to be attached to any length.
  • FIGS. 3 and 4 The manner according to the invention, in which the covering 1 is fastened to the baffle wall 2 or to the partial regions 3 and 4 of the ramp 5, is shown in greater detail in FIGS. 3 and 4.
  • the edge strips 6, 6 ' arranged to a frame side parts 8, 8 'springs 7, which are supported in the interior of blind holes 20 of the outer side parts 8.
  • the pressure of the springs 7 causes the covering 1 between the edge strips 6 and 6 'to be under elastic tension, which is now no longer made from the material of the covering 1 depends, but can be determined by a suitable choice of springs 7.
  • the edge strips 6 and 6 ' are angled twice, so that their outer edge 9 is at a distance from the side parts 8 and 8', to which they are fastened by means of screws 24 or the like.
  • the shape and arrangement of the facing edge strips 6 of the baffle wall 2 and ramp 5 determine the collecting channel 22, against the bottom of which the tennis balls 17 rest, while they are being transported by the conveyor screw 11 consisting of an inner tube or rod 18 and a helix 19.
  • the ramp 5 Since the ramp 5 is fastened to the stand 16 by means of a joint 21 and there is also a joint 10 between the ascending region 3 and the descending region 4 of the ramp, the ramp 5 can easily be folded up in a space-saving manner when the device is not in operation is.
  • a particular advantage of the arrangement is, however, that the elasticity of the ramp caused by the springs 7 prevents damage to the ramp even when it is not folded up and play on the covering increases.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Pinball Game Machines (AREA)
  • Toys (AREA)
  • Golf Clubs (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Electroluminescent Light Sources (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Vibration Prevention Devices (AREA)
  • Road Paving Structures (AREA)
  • Handcart (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Closures For Containers (AREA)
  • Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Feeding Of Articles To Conveyors (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Screw Conveyors (AREA)
  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)

Abstract

PCT No. PCT/AT84/00006 Sec. 371 Date Oct. 12, 1984 Sec. 102(e) Date Oct. 12, 1984 PCT Filed Feb. 16, 1984 PCT Pub. No. WO84/03222 PCT Pub. Date Aug. 30, 1984.Installation for the transport of tennis balls having at least one substantially vertical bouncing wall as well as a collector gutter for the balls and arranged at the foot of the wall. The covering (1) of the bouncing wall (2) is simply attached to a pair of parallel flanges (6,6') of the frame and the lateral portions (8,8') connecting the flanges (6,6') move away from each other due to the pressure of the springs (7) which are arranged thereto.

Description

Die Erfindung bezieht sich auf eine Anlage zum Fördern von Tennisballen, mit einer wenigstens annähernd lotrechten Prallwand und einer an deren Fuß angeordneten Sammelrinne für die Bälle, an welche zum Spielfeld hin eine Rampe mit einem ansteigenden und einem abfallenden Bereich anschließt, wobei Prallwand bzw. Rampe abpralldämpfend ausgebildet sind.The invention relates to a system for conveying tennis balls, with an at least approximately perpendicular baffle and a collecting channel arranged at the foot of the balls, to which a ramp with a rising and a falling area adjoins the playing field, baffle or ramp are designed to absorb bumps.

Derartige Anlagen, wie sie beispielsweise EP-A-0 043 886 zu entnehmen sind, haben den Zweck, die von einem Spieler gegen die lotrechte Prallwand oder die Rampe geschlagenen Bälle zu sammeln und einer Fördereinrichtung zuzuführen, welche sie zu einem Behälter weitertransportiert. An diesen Behälter ist üblicherweise eine Ballwurfmaschine angeschlossen.Systems of this type, as can be seen, for example, from EP-A-0 043 886, have the purpose of collecting the balls hit by a player against the vertical baffle or the ramp and feeding them to a conveying device which transports them to a container. A ball throwing machine is usually connected to this container.

Aufgabe der Erfindung ist es, bei einer derartigen Einrichtung sicherzustellen, daß gegen die Prallwand geschlagene Bälle mit möglichst geringer Restenergie von der Wand zurückspringen, sodaß sie nicht über die Rampe hinweg ins Feld zurückgeschleudert werden, sondern von der geeignet ausgebildeten Rampe in die Sammelrinne geleitet werden.The object of the invention is to ensure in such a device that balls hit against the baffle spring back from the wall with as little residual energy as possible, so that they are not thrown back over the ramp into the field, but are directed from the suitably designed ramp into the collecting trough .

In DE-A-23 34 849 wurde zur Lösung der selben Aufgabe bereits vorgeschlagen, die Prallwand aus "elastisch dämpfendem" Material herzustellen und dieses unter Spannung zu setzen. Abgesehen davon, daß gar nicht bekannt ist, welche Materialien zur Lösung der gestellten Aufgabe geeignete Eigenschaften hätten, soll es die Erfindung ermöglichen, eine nahezu beliebige Bespannung für Prallwand und Rampe zu verwenden, die unter dem Gesichtspunkt der Strapazierfähigkeit, Reinigungsfähigkeit u. dgl. ausgewählt werden kann.In DE-A-23 34 849 it has already been proposed to solve the same problem to produce the baffle from "elastically damping" material and to put it under tension. In addition to the fact that it is not known at all which materials would have suitable properties for solving the task at hand, the invention is intended to make it possible to use almost any covering for the baffle wall and ramp which, from the point of view of durability, cleanability and the like. Like. Can be selected.

Rein äußerlich zeigt die zur Lösung der Aufgabe vorgeschlagene Einrichtung eine gewisse Ähnlichkeit mit DE-A-1 428 841. Dort ist eine mittels Federn an einem Rahmen befestigte Bespannung dargestellt, welche den Tennisball jedoch nicht abbremst, sondern im Gegenteil auf den Spielplatz zurückwirft und damit einen Rückschlag des Balles durch einen Gegenspieler simuliert. Im Gegensatz hiezu ist gemäß der Erfindung vorgesehen, daß die Prallwand und/oder wenigstens ein Bereich der Rampe eine Bespannung aufweist, welche lediglich an einem Paar paralleler, horizontal und normal zur Richtung des Spielfeldes verlaufender Randleisten eines Rahmens befestigt ist und daß die die Randleisten zu einem Rechteck verbindenden, aus ineinandergeschobenen Rohrstücken bestehenden Seitenteile des Rahmens unter dem Druck darin angeordneter Federn auseinanderstreben.On the outside, the device proposed to solve the problem shows a certain similarity to DE-A-1 428 841. There is shown a cover attached to a frame by means of springs, which, however, does not slow down the tennis ball, but on the contrary throws it back onto the playground and thus simulates a kickback of the ball by an opponent. In contrast to this, it is provided according to the invention that the baffle and / or at least a portion of the ramp has a covering which is only attached to a pair of parallel, horizontal and normal to the direction of the playing field edge strips of a frame and that the edge strips a rectangular connecting side pieces of the frame consisting of telescoped pieces of pipe strive apart under the pressure of springs arranged therein.

Da die Breite der Hallen, für welche die erfindungsgemäße Anlage verwendbar sein soll, in weiten Grenzen schwankt, ist es sinnvoll, sowohl die Prallwände wie die Rampen in Teilstücken konstanter Länge herzustellen, die aneinandergereiht werden können. Da Rampe und Prallwand in diesem Falle mehrfach durch unter Federdruck stehende Seitenteile unterbrochen sind, empfiehlt es sich, daß die Bespannung den Außenrand der Randleisten umgreift, welcher vor der Ebene der Seitenteile liegt. Hiedurch wird verhindert, daß die Plane auf den unter Federdruck stehenden Seitenteilen aufliegt und Bälle von diesen Bereichen ungedämpft ins Spielfeld zurückprallen.Since the width of the halls for which the system according to the invention is to be used fluctuates within wide limits, it makes sense to manufacture both the baffle walls and the ramps in sections of constant length which can be strung together. Since the ramp and the baffle in this case are interrupted several times by side parts under spring pressure, it is recommended that the covering encompasses the outer edge of the edge strips, which lies in front of the level of the side parts. This prevents the tarpaulin from resting on the side parts under spring pressure and balls from these areas bouncing back into the field undamped.

Weitere Einzelheiten der Erfindung werden anschließend anhand der Zeichnung erläutert.

  • Fig. 1 zeigt ein Ausführungsbeispiel der Erfindung von der Seite,
  • Fig. 2 die zugehörige Draufsicht,
  • Fig. 3 und 4 stellen Ausschnitte von vergrößerten Seitenansichten teilweise geschnitten dar.
Further details of the invention are explained below with reference to the drawing.
  • 1 shows an embodiment of the invention from the side,
  • 2 the associated top view,
  • 3 and 4 represent sections of enlarged side views partially cut.

Die erfindungsgemäße Anordnung besteht im wesentlichen aus einer von Ständern 16 getragenen, wenigstens annähernd vertikalen Prallwand 2, die ebenso wie die aus einem aufsteigenden Bereich und einem absteigenden Bereich 4 zusammengesetzte Rampe 5 mit einer Bespannung 1 versehen ist. Diese Bespannung verläuft zwischen Randleisten 6 und 6', die durch teleskopartig ineinandergeschobene Seitenteile 8, 8' auf Distanz gehalten werden.The arrangement according to the invention essentially consists of an at least approximately vertical baffle wall 2 carried by stands 16, which, like the ramp 5 composed of an ascending area and a descending area 4, is provided with a covering 1. This covering runs between edge strips 6 and 6 ', which are held at a distance by telescopically pushed side parts 8, 8'.

Ein Gelenk 10 hält die Rampe 5 in der dargestellten Lage, sodaß sich zwischen Rampe 5 und Prallwand 2 eine Sammelrinne 22 bildet. Durch diese Sammelrinne werden die Tennisbälle 17 im vorliegenden Ausführungsbeispiel durch eine Förderschnecke 11 zu einem Ausgangsgehäuse 23 gefördert, in weiches sie von einem Schaufelrad 14 einzeln eingeführt werden. Dieses Schaufelrad 14 wird mittels eines Übersetzungsgetriebes 25 vom selben Motor 12 angetrieben wie die Förderschnecke 11. Aus dem Ausgangsgehäuse 23 werden die Tennisbälle 17 durch ein Gebläse 13 in den Schlauch 15 gedrückt, durch welchen sie zu dem nicht dargestellten Sammelbehälter, beispielsweise. einer Ballwurfmaschine, gelangen.A joint 10 holds the ramp 5 in the position shown, so that a collecting channel 22 is formed between the ramp 5 and the baffle wall 2. Through this collecting trough, the tennis balls 17 in the present exemplary embodiment are conveyed by a screw conveyor 11 to an output housing 23, into which they are individually introduced by a paddle wheel 14. This paddle wheel 14 is driven by means of a transmission gear 25 from the same motor 12 as the screw conveyor 11. From the outlet housing 23, the tennis balls 17 are pressed by a blower 13 into the hose 15, through which they lead to the collecting container, not shown, for example. a ball throwing machine.

Wie besonders aus Fig. 2 hervorgeht, sind Prallwand 2 und Rampe 5 aus Einzelteilen konstanter Breite zusammengesetzt, wodurch die ganze Anlage leicht transportfähig wird und außerdem in verschiedenen Breiten aus vorbereiteten Elementen zusammengesetzt werden kann. Zum Transport der Tennisbälle 18 genügt dabei eine einzige Fördereinrichtung. Die Förderschnecke 11 ist jedoch mit Kupplungsstellen 31 zu versehen, die es erlauben, sie zu beliebiger Länge anzustückeln.As is particularly apparent from Fig. 2, baffle 2 and ramp 5 are composed of individual parts of constant width, which makes the entire system easy to transport and can also be assembled in different widths from prepared elements. A single conveyor is sufficient to transport the tennis balls 18. However, the screw conveyor 11 is to be provided with coupling points 31, which allow it to be attached to any length.

Die erfindungsgemäße Art, in welcher die Bespannung 1 an der Prallwand 2 bzw. den Teilbereichen 3 und 4 der Rampe 5 befestigt ist, zeigen in größerem Detail Fig. 3 und 4. Wie man sieht, sind zwischen den durch die Randleisten 6, 6' zu einem Rahmen verbundenen Seitenteilen 8, 8' Federn 7 angeordnet, die sich im Innern von Sacklöchern 20 der äußeren Seitenteile 8 abstützen. Der Druck der Federn 7 bewirkt, daß die Bespannung 1 zwischen den Randleisten 6 und 6' unter elastischer Spannung steht, die nun nicht mehr vom Material der Bespannung 1 abhängt, sondern durch geeignete Wahl der Federn 7 bestimmt werden kann. Die Randleisten 6 bzw. 6' sind zweifach abgewinkelt, sodaß ihr Außenrand 9 einen Abstand von den Seitenteilen 8 bzw. 8' aufweist, an welchen sie mittels Schrauben 24 od. dgl. befestigt sind.The manner according to the invention, in which the covering 1 is fastened to the baffle wall 2 or to the partial regions 3 and 4 of the ramp 5, is shown in greater detail in FIGS. 3 and 4. As can be seen, there are between the edge strips 6, 6 ' arranged to a frame side parts 8, 8 'springs 7, which are supported in the interior of blind holes 20 of the outer side parts 8. The pressure of the springs 7 causes the covering 1 between the edge strips 6 and 6 'to be under elastic tension, which is now no longer made from the material of the covering 1 depends, but can be determined by a suitable choice of springs 7. The edge strips 6 and 6 'are angled twice, so that their outer edge 9 is at a distance from the side parts 8 and 8', to which they are fastened by means of screws 24 or the like.

Form und Anordnung der einander zugewandten Randleisten 6 von Prallwand 2 und Rampe 5 bestimmen die Sammelrinne 22, an deren Grund die Tennisbälle 17 aufliegen, während sie von der aus einem inneren Rohr bzw. Stab 18 und einer Wendel 19 bestehenden Förderschnecke 11 transportiert werden.The shape and arrangement of the facing edge strips 6 of the baffle wall 2 and ramp 5 determine the collecting channel 22, against the bottom of which the tennis balls 17 rest, while they are being transported by the conveyor screw 11 consisting of an inner tube or rod 18 and a helix 19.

Da die Rampe 5 am Ständer 16 mittels eines Gelenkes 21 befestigt ist und sich überdies zwischen dem aufsteigenden Bereich 3 und dem absteigenden Bereich 4 der Rampe ein Gelenk 10 befindet, kann die Rampe 5 leicht in platzsparender Weise zusammengeklappt werden, wann die Einrichtung nicht in Betrieb ist. Ein besonderer Vorteil der Anordnung liegt allerdings auch darin, daß die durch die Federn 7 bewirkte Elastizität der Rampe Beschädigungen der Rampe selbst dann verhindert, wenn diese nicht hochgeklappt ist und ein Spiele auf die Bespannung steigt.Since the ramp 5 is fastened to the stand 16 by means of a joint 21 and there is also a joint 10 between the ascending region 3 and the descending region 4 of the ramp, the ramp 5 can easily be folded up in a space-saving manner when the device is not in operation is. A particular advantage of the arrangement is, however, that the elasticity of the ramp caused by the springs 7 prevents damage to the ramp even when it is not folded up and play on the covering increases.

Claims (2)

1. A system for delivering tennis balls comprising an at least substantially vertical rebound wall and a collection through for the balls disposed at the base of said wall, a ramp having an ascending and descending portion leading to the playing area being connected to said rebound wall, the rebound wall and the ramp being made in a rebound dampening manner, characterized in that the rebound wall (2) and/or at least one area (3,4) of the ramp are provided with a covering (1) which is secured only ton one pair of parallel edge rails (6,6') of a frame which extend horizontally and normally to the direction of the playing area, and in that the side portions (8,8') of the frame that join the edge rails (6,6') to form a rectangle and comprise sections of tubing inserted one into the other are forced away from each other by the pressure of springs (7) arranged therein.
2. A system according to claim 1, characterized in that the covering (1) wraps around an outer edge (9) of the edge rails (6,6') which lies in front of the plane of the side portions (8,8').
EP84900702A 1983-02-23 1984-02-16 Installation for the transport of tennis balls Expired EP0136295B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT610/83 1983-02-23
AT61083 1983-02-23

Publications (2)

Publication Number Publication Date
EP0136295A1 EP0136295A1 (en) 1985-04-10
EP0136295B1 true EP0136295B1 (en) 1987-09-02

Family

ID=3495144

Family Applications (1)

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EP84900702A Expired EP0136295B1 (en) 1983-02-23 1984-02-16 Installation for the transport of tennis balls

Country Status (13)

Country Link
US (1) US4621812A (en)
EP (1) EP0136295B1 (en)
JP (1) JPS60500601A (en)
AT (1) ATE29218T1 (en)
AU (1) AU569869B2 (en)
CA (1) CA1218685A (en)
DE (1) DE3465701D1 (en)
DK (1) DK154050C (en)
FI (1) FI77377C (en)
IT (1) IT1173323B (en)
NZ (1) NZ207237A (en)
WO (1) WO1984003222A1 (en)
ZA (1) ZA841245B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938479A (en) * 1988-07-11 1990-07-03 Jenkins Craig D Tennis ball return apparatus
US4951946A (en) * 1989-03-07 1990-08-28 Deyoung Lee Portable folding game ramp
US4971319A (en) * 1990-03-19 1990-11-20 John Cutrone Tennis ball returner
GB2498819B (en) * 2012-03-22 2014-02-26 Courtflow Ltd Ball collection system and playing area

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1428841A1 (en) * 1963-01-24 1969-01-23 Bishop & Co Ltd Tennis equipment
DE2334849A1 (en) * 1973-07-09 1975-01-30 Ludwig Bloemker Lawn tennis training installation with ball throwing machine - has court side walls with balls transporting means towards throwing machine
EP0043886A1 (en) * 1977-11-17 1982-01-20 Norbert Dipl.-Ing. Kainz Installations for transporting tennis balls to a ball-throwing machine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1584093A (en) * 1925-06-25 1926-05-11 Harris Rex Golf practice game apparatus
US2280376A (en) * 1940-02-12 1942-04-21 Louis F Clark Machine for playing tennis and the like
GB887916A (en) * 1958-08-30 1962-01-24 John Michael Denton Improvements in or relating to projection screens
US3195898A (en) * 1962-02-01 1965-07-20 Eugene M Respini Net supporting arrangement
US3602506A (en) * 1968-12-06 1971-08-31 Joseph Arthur Gentiluomo Golf range
US3989246A (en) * 1973-12-14 1976-11-02 Brown Alvin I Tennis practice system
US3918711A (en) * 1974-01-14 1975-11-11 Thomas J Zak Tennis training ball target and projector
JPS5126091A (en) * 1974-08-28 1976-03-03 Hitachi Ltd TAINETSUKIRETSUSEISHIKENHO OYOBI SHIKENSOCHI
US4082271A (en) * 1976-04-29 1978-04-04 Arthur Lee Martin Tennis practice and teaching rebounder
US4206916A (en) * 1978-05-25 1980-06-10 Epply William R Tensioned net
US4275883A (en) * 1979-10-09 1981-06-30 Anthony Grimaldi Pitching target with ball return

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1428841A1 (en) * 1963-01-24 1969-01-23 Bishop & Co Ltd Tennis equipment
DE2334849A1 (en) * 1973-07-09 1975-01-30 Ludwig Bloemker Lawn tennis training installation with ball throwing machine - has court side walls with balls transporting means towards throwing machine
EP0043886A1 (en) * 1977-11-17 1982-01-20 Norbert Dipl.-Ing. Kainz Installations for transporting tennis balls to a ball-throwing machine

Also Published As

Publication number Publication date
DK503084A (en) 1984-10-22
ATE29218T1 (en) 1987-09-15
JPS60500601A (en) 1985-05-02
DE3465701D1 (en) 1987-10-08
FI77377B (en) 1988-11-30
FI844074L (en) 1984-10-16
WO1984003222A1 (en) 1984-08-30
DK503084D0 (en) 1984-10-22
AU569869B2 (en) 1988-02-25
EP0136295A1 (en) 1985-04-10
IT1173323B (en) 1987-06-24
AU2498484A (en) 1984-09-10
US4621812A (en) 1986-11-11
DK154050B (en) 1988-10-10
ZA841245B (en) 1984-10-31
DK154050C (en) 1989-02-27
FI844074A0 (en) 1984-10-16
FI77377C (en) 1989-03-10
CA1218685A (en) 1987-03-03
NZ207237A (en) 1986-12-05
IT8419719A0 (en) 1984-02-21

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