Warren M Bosworth DeceasedDelray Beach, FL

D299672, Jan 31, 1989

Jan 3, 1986

6/815830

Warren M. Bosworth - Glastonbury CT

FTM Corporation - Los Angeles CA

D21212

4366958, Jan 4, 1983

Jun 23, 1980

6/161670

Warren Bosworth - Glastonbury CT

Tennis Machines, Inc. - St. Louis MO

A63B 5114

273 73A

An apparatus for use in stringing rackets comprising a support structure including a pedestal having a base portion with a weighted foot pedal pivotally attached thereto, a racket supporting portion attached to the upper end of the support portion, a string clamp mechanism operatively connected to the foot pedal, the clamp mechanism including clamp members for engaging and clamping a length of string extending therebetween, a clamp support member mounted adjacent to the racket supporting portion, a string clamp assembly including a pair of members having portions for engaging a length of string extending therebetween, a member pivotally connecting the pair of members, a spring between the clamp members biasing said string engaging portions apart, and a clamp operator member movable between an open position whereby a length of string can be moved between the string engaging portions and a closed position in which the string engaging portions move into clamping positions. The subject improvements also reside in an improved string tension adjustment mechanism, a novel guide bar assembly for supporting the string clamp assemblies in different positions, a novel brake assembly for locking a racket in different positions relative to the string clamp mechanism, a novel racket engaging support structure including a quick operating racket clamp and racket release device therefor, and an optional modified clamp support structure which enables stringing rackets that have their crossed string reaches oriented at other than a right angle.

D299042, Dec 20, 1988

Jan 3, 1986

6/815985

Warren M. Bosworth - Glastonbury CT

FTM Corporation - Los Angeles CA

D21212

4546977, Oct 15, 1985

Jun 14, 1984

6/620520

Warren M. Bosworth - Glastonbury CT
Fred E. Martin - San Diego CA

Ektelon - San Diego CA

A63B 5114

273 73A

A racket stringing machine utilizing an improved retaining standard for securing a racket to be strung in a fixed position. The retaining standard includes a vise portion and a clamp portion. The clamp portion has an attached rod that fits into a hole in the vise. The clamp portion serves to maintain the racket to be strung in a fixed position on the vise. The vise also includes a slot into which a dog is inserted. The dog bears against the clamp rod and fixes it in a particular location. A handle having a cam portion is also provided. The cam portion of the handle engages the dog so as to allow selective engagement with the clamp rod. Additionally, frame retainers of different sizes and shapes are provided that allow rackets of various configurations to be strung with the same stringing machine.