公开(公告)号：US3899172A

公开(公告)日：1975-08-12

申请号：US26134472

申请日：1972-06-09

申请人： MAARK CORP

发明人： VAUGHN GEORGE A ,  HARGRAVE RICHARD D

IPC分类号： A63B49/00 ,  A63B49/02 ,  A63B49/08 ,  A63B49/12

CPC分类号： A63B49/08 ,  A63B49/022 ,  A63B49/03 ,  A63B49/12

摘要： A novel tennis racket structure is set forth. The combination of novel frame strip, plastic throat piece structure, grommet means and handle structure provide an improved racket having improved strength characteristics, reliability and durability. A novel frame strip structure provides an improved racket strength factor. The frame strip comprises an extruded metal member having a pair of opposed tubular sections connected by a web and having a cross-sectional configuration for defining a strength factor (IYs/A) in the range of 0.0516 (in2) Ys to 0.0580 (in2) Ys.

公开(公告)号：US3805366A

公开(公告)日：1974-04-23

申请号：US26134572

申请日：1972-06-09

申请人： MAARK CORP

发明人： VAUGHN G ,  HARGRAVE R

IPC分类号： A63B49/00 ,  A63B49/02 ,  A63B49/08 ,  A63B49/12 ,  B23P19/04

CPC分类号： A63B49/12 ,  A63B49/022 ,  A63B49/028 ,  A63B49/03 ,  A63B49/08 ,  Y10T29/49838 ,  Y10T29/49888 ,  Y10T29/49964

摘要： A novel tennis racket structure, tennis racket frame strip and method of manufacturing a tennis racket are set forth. The combination of novel frame strip, throat piece structure, grommet means and handle structure provide an improved racket having improved strength characteristics, reliability and durability. A novel frame strip structure provides an improved racket strength factor.

摘要翻译： 阐述了一种新颖的网球拍结构，网球拍框架条和制造网球拍的方法。 新颖的框架条，喉部结构，索环装置和手柄结构的组合提供了改进的强度特性，可靠性和耐久性的球拍。 新颖的框架条结构提供了改进的球拍强度因子。

公开(公告)号：US3745729A

公开(公告)日：1973-07-17

申请号：US3745729D

申请日：1971-12-21

申请人： MAARK CORP

发明人： VAUGHN G ,  HARGRAVE R

IPC分类号： E01C13/04 ,  E04H3/14 ,  E04H17/10 ,  E04H17/16

CPC分类号： E04H17/10 ,  E01C13/04 ,  E04H3/14 ,  E04H17/16

摘要： Metal support apparatus including a plurality of structurally interrelated metal members with each metal member being of a predetermined configuration. Also disclosed is a metal (e.g. aluminum) platform tennis court including a plurality of such above-mentioned metal support apparatus on the deck or playing surface of the court, such metal deck or playing surface providing, over the entire area thereof, a more uniform deflection in response to the weight or force of a running player than a wooden playing surface or deck of a wooden platform tennis court. Such metal platform tennis court also including means provided on the screen vertical support members for tensioning the screen which, unlike the prior art, is not bolted through the deck of the platform tennis court thereby permitting the screen tension to be adjusted by one operator residing on the deck and also permitting the screen to remain in a tensioned condition or fully secured condition during disassembly and transport thus precluding screen tangling or fouling.

公开(公告)号：US3702701A

公开(公告)日：1972-11-14

申请号：US3702701D

申请日：1969-08-28

申请人： MAARK CORP

发明人： VAUGHN GEORGE A ,  HARGRAVE RICHARD D

IPC分类号： A63B49/00 ,  A63B49/02 ,  A63B49/08 ,  A63B49/12 ,  A63B51/00

CPC分类号： A63B49/12 ,  A63B49/022 ,  A63B49/028 ,  A63B49/03 ,  A63B49/08

摘要： THE METAL RACKET IS MADE FROM AN EXTRUDED ALUMINUM STRIP COMPRISING A PAIR OF OPPOSED TUBULAR SECTIONS CONNECTED BY A WEB, WITH A STRENGTH FACTOR OF 1YS/A IN THE RANGE OF 0.0516YS TO 0.0580YS. THE METAL STRIP HAS A FIRST CHANNEL IN ITS OUTER PERIPHERY AND A SECOND CHANNEL IN ITS INNER PERIPHERY. A PLASTIC THROAT PIECE IS PROVIDED WITH OUTER SURFACES SHAPED COMPLEMENTARILY TO THE CONFIGURATION OF THE INNER PERIPHERY OF THE METAL STRIP. THE RACKET FURTHER HAVING A SOLID MOLDED PLASTIC HANDLE MADE OF A FOAMED PLASTIC MATERIAL MOLDED TO THE LOWER EXTERMITIES OF THE METAL STRIP.