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Publication numberUS1422993 A
Publication typeGrant
Publication dateJul 18, 1922
Filing dateFeb 13, 1922
Priority dateFeb 13, 1922
Publication numberUS 1422993 A, US 1422993A, US-A-1422993, US1422993 A, US1422993A
InventorsWilliam A Larned
Original AssigneeDayton Steel Racquet Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Elastic metal stringing, and the method of making the same
US 1422993 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


APPLICATION man FEB. xs, 1922.

ZKM' l v wif sirenes ice.


E 5.122,9@30 I Specification of Letters Patent. Pagntgg July 18,1; 922

nppiieaeon ined February is, ieee. serial no. 536,135.

To aZZ/wkomfimay concern: In the accompanying drawings, the nu 45 Be it known that I, WILLIAM-A. LARNED, merel l designates e Wire of any suitable e citizen of tlie United Steteeiesiding at materiel, which is iiisty wound around e. cen- Summit, in tlie county of Union and State of trel core7 or en imeginerv cylinder, to form 5 New JerseyTliei'e invented certain new and e helix of 'e large numberv of coils per inch .useful Improvements in an Elestic Metal es shown in Figures 6 and 7.. This Wire is 504 Stringing and the Methods of Meki-ng the .then stretched by. any suitable ineens, or Seme, of which the following is especice- When bein inserted in the racket, to reduce tion, tlie number of its coils per inch to provide 10' -One of the principal objects of my invene desired stiffness, Weight end elasticity tion is to provide for tennis iacliets and other required for the use to which it is pnt. ce

A uses, en elastic metal-Stringing to Wliicli the In' Fi u re l this Wire so .coiled and Arequired degree of stillness is imported by stretclie ,is employed estlie Stringing in e my improved method. The Stringing may tennis ,racketfrziine 2, where it will eesily le comprise one, two or more Wires that are give or yield when extended under the inilirstgvound to form e heli-nef e number of petus of tlie ball and thereafter reedilyr'eo5 coils 'pei' inch, end tliereeei' stretched'in'the turn t its originalforin. When extended', direction of the exis of tlieletter, to reduce the coiled strand will decreese in diameter to the nuniber of coils per inchto secure the givet'otlie Stringing which it constitutes, 2o desired degree of stili'ness,weigl1t andfeles- -the desired resiliency for, use in e tennis ticity required of the Wire for the use to 'reclgetor other striicture. 70-

`which it is put.. leving described my invention, I claim: l lf the use be I'tliet of e Stringing for e. l. `i elastic metal-'Stringing comprising e. tennis racket, e Wire oiel large number of YWire whioh'lias first been Wound to form e 25 coils er incliistoo lieevy. Accordin lygby helix of e nuinberof coils per inch, end stretc ing or extendingn it, the desire ness and Weight ofthewire cen be'obteined, exis ofthe letter, to reduce the number. of Without sacrificing the degree of 'elasticity its coils per inch ytegive the degree of stili"- y the Wire shouldheve to adept it foi e tennis ness, Weight end 'elasticity required of it for 3ok racket string. the-useto .which it is pnt.

stithereafter stretched in the direction of the Z5 ln the accompanying drawings, iFigure l 2. The method of makin an elastic nietel- .80 l

,"i's e plan view oi e portion. of e. tennis racket Stringing of ,e desired sti ness, Weight and containing inywire Stringing. Figure 2 is n elasticit which consists in first Winding :t y side view of e single wire Wound to forme wire to forni enclin of e number of coils per 35 helix containing e leige number of coils er inch, and thereafter extending seid wire in` f inch. Firure 3 is e cross section tellen the' direction of its longitudinal exis, toiree5 through tiejseine. Figure l ise eide View 'duce the 'number of its coils per inch to 'e of the seine Wire after it has been stretched point Where the desired degree of stiiness, to reduce the, number of coils per inch. And weight and elasticity is obtained. i0 Figure 5 is a. cross sect-ibn teken through the ln testimony whereof I lieve hereunto set saine. my lizind this 10th dey of February, i922.- 'lhrongliout the specicetion and drew- -WILLIAM A. LARNED;

0 ings7 similarireference elierecters denote I .Witness:

.correspondingpeits l How-.inn SSi/ii'rn'.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2728278 *May 19, 1952Dec 27, 1955Joseph LitochlebCoiled musical instrument string and musical instrument strung with said string
US4288901 *Jun 27, 1979Sep 15, 1981Babcock Clarence OMethod of manufacturing and calibrating a displacement measuring sensor
US4913430 *Jan 20, 1988Apr 3, 1990Leo LichtensteinTennis racket strings having orthogonally directed protrusions for enhancing the grip when in contact with a tennis ball
US6447412 *Apr 18, 2000Sep 10, 2002Ef Composite Technologies, L.P.Sports racket with undulations in frame interior surface
US6761651 *Nov 22, 2002Jul 13, 2004Chin-Dong PaiAluminum tennis racket
US6958104Aug 20, 2002Oct 25, 2005Ef Composite Technologies, L.P.Sports racket with undulations in frame interior surface
US20050215361 *Mar 29, 2004Sep 29, 2005Tseng Hsing-SanRacket frame structure made of aluminum alloy
U.S. Classification428/592, 267/148, 57/246, 57/311, 57/200, 473/524, 24/715.7
International ClassificationA63B51/02
Cooperative ClassificationA63B51/02
European ClassificationA63B51/02