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Publication numberUS2712160 A
Publication typeGrant
Publication dateJul 5, 1955
Filing dateFeb 21, 1951
Publication numberUS 2712160 A, US 2712160A, US-A-2712160, US2712160 A, US2712160A
InventorsWalter L. Sterczek
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of making individual bowling
US 2712160 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)


FIG. 2.

F IG. 4.

A/dflZL WENTOR United States Patent METHOD OF MAKING INDIVIDUAL BOWLING BALL GRIPS This invention relates to a method of making individual bowling ball grips and has for its primary object accurately to produce in a bowling ball, comfortable cavities conforming to the shape of a thumb and at least one finger of the user to insure accuracy in the holding of the ball preparatory to its delivery.

Another object is accurately to reproduce a cast of the hand of an individual in gripping position with relation to a bowling ball, which cast may be utilized in the formation of the ball to insure accuracy of the grip.

The above and other objects may be attained by employing this invention which embodies among its features first making an impression of the hand of an individual in a gripping and prior to releasing position, forming a cast in the impression, supporting the cast in a mold in which a ball is to be formed, forming the bowling ball about the cast and subsequently removing the cast and finishing the ball.

Other features include forming the cast in the impression introducing the cast into a mold having at least a portion of its surface conforming to the configuration of the bowling ball introducing bowling ball forming material into the mold around the cast and subsequently removing the cast and finishing the item so molded.

Still other features include forming a plug about a cast conforming to the thumb and at least one finger of an individual, removing the cast from the plug, finishing the surrface thereof and introducing the plug into a cavity in a bowling ball to produce a sphere having cavities therein conforming to the shape of the thumb and at least one finger of the individual in gripping position.

In the drawings:

Figure l is a side view partly in section of a mold in which the impression is made of the thumb and at least one finger of the individual to use the ball.

Figure 2 is a view similar to Figure 1 showing the thumb and finger removed and the cast in the process of being made,

Figure 3 is a view illustrating the cast in place in a mold in which a bowling ball is to be formed.

Figure 4 is a side view of the mold illustrating the cast in dotted lines.

Referring to the drawings in detail a form 15 preferably of hemi-spherical shape conforming generally to the size and contour of one half of the bowling ball is provided with spaced cavities 16 and 17 into which a shape retaining substance 18 such as liquid rubber, plaster or plastic is introduced. This substance has the property of setting slowly upon exposure to air and after introducing the substance into the cavities 16 and 17 the thumb and at least one finger of the individual for whom the bowling ball is to be made is introduced into the cavities so as to cause an impressionto be formed in the shape retaining substance 18 so that the contour of the cavities formed in the substance 18 will conform to the size and shape of the finger and thumb with proper provision made for clearance which is needed when ball is thrown. Flexible, snug fitting tubing of previously determined thickness ties previously referred to.

Patented July 5, 1955 ice can be slipped over the finger and thumb when melting the impression for cast 22. Use of said tubing will make possible that the cavities 28 and 29 will have clearance which is necessary for repetitious, comfortable and accurate delivery of ball. 1

It is to be understood of course that while ,in themajority of instances bowling balls are formed with only .two cavities 16 and 17 a third may be employed for the:introduction of another finger and an impression formed thereof as above described. After setting of the plastic substance 18 a font 19 is mounted upon the form 15 as shown in Figure 2 and a low melting point alloy 20 is introduced in liquid form into said font from a suitable container such as a crucible 21.

Upon the setting of the alloy 20 and its conversion from a liquid to a solid state the cast 22 made therefrom is removed from the form 15 and the impressions 18 and is introduced into a mold half 23 in which one portion of the bowling ball is to be formed. The other mold half 24 is then placed in position on the mold half 23 and ball forming material 25 is loaded into the mold so as to surround the projections 27 on the cast 22 as illustrated in Figure 3 and thus form the cavities. Having introduced the material 25 into the mold parts 23 and 24, and around the projections 27 of the cast 22, the ball forming mate'- rial is subjected to heat and pressure, between the mold halves. Said heat and pressure forms a spherical body conforming to the size and shape of a bowling ball and when the material is set and cured, the mold halves 23 and 24 are separated and the ball thus molded together with the cast 22 is removed from the mold.

In as much as the cast 22 is made from a low melting point alloy, it is obvious that the cast 22 may be readily melted from the spherical body so as to leave the cavi- Having completed the ball with the cavities therein the surfaces are finished and polished in the ordinary manner. It will thus be seen that the ball will be provided with cavities conforming to the shape of the thumb and finger or fingers respectively of the individual from whose thumb and finger or fingers the cast 22 was made. As a consequence a natural and comfortable grip will be provided in the ball.

In the mold, the opening 26 is used as a vent and/or chamber where excess ball forming material can accuniulate during the heat and pressure operation, and

through which opening 26 positive or auxiliary pressure can be applied, depending on the specific requirements.

of the chosen ball forming material which may be used. Screw plug 30 is fitted to opening 26, said screw plug 30 being used to close opening 26 when the molding process peculiarities of the ball forming material should demand it.

From the foregoing it will be obvious that new bowling balls may be made having custom fitted grips and where so desired balls already produced may be fitted with custom fitted grips according to the desires of the user. Such custom fitted grips assure accurate handling of the ball and provide comfort for the user by eliminating the fatigue that frequently accompanies the use of a bowling ball having grips of improper span or shape of the finger hole.

It is to be understood that minor changes may be made in carrying out the process and that the invention is not limited to the use of rubber, plaster or plastic but that any suitable shape retaining substances and low melting material may be substituted should occasion demand.

What I claim is:

The hereindescribed method of making an individual bowling ball grip which includes, forming a body having a spherical contour conforming to the curvature of a bowling ball, forming at least two cavities in the body to receive the thumb and at least one finger of the individual for whom the grip is to be made, introducing a flowable, shape retaining substance into the cavities, introducing the thumb and at least one finger of the individual into the fiowable, shape retaining substance to form an impression thereof in said substance, removing the thumb and finger or fingers, pouring a low melting point material in the impressions to produce a cast of the thumb and finger or fingers, introducing the cast thus formed into a mold, filling the mold with ball forming material, forming a ball in the mold about the cast, melting the cast to leave cavities in the ball conforming to the size and shape of the thumb and fingers of which the cast .was made and finishing the ball.

UNITED STATES PATENTS Davis Oct. 8, Richards Feb. 10, Walter Jan. 10, Errington et al. Sept. 23, Hess s July 13, Feinbloom Sept. 6, Raiche- July 7, Lennington Feb. 15,

' Kramer Sept. 20,

Patent Citations
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US412479 *Nov 9, 1888Oct 8, 1889 Charles a
US720482 *Jun 4, 1902Feb 10, 1903Kempshall Mfg CoProcess of making shells for playing-balls.
US779979 *Feb 29, 1904Jan 10, 1905John WalterManufacturing decorative articles from plastic materials.
US1776622 *May 19, 1928Sep 23, 1930Errington TomDummy sweetmeat
US2086939 *Feb 19, 1936Jul 13, 1937Henry K HessMethod of repairing impaired bowling pins and article resulting therefrom
US2129304 *Apr 6, 1936Sep 6, 1938Feinbloom WilliamContact lens
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US2341999 *Nov 28, 1939Feb 15, 1944Joseph B LenningtonMethod of molding
US2482190 *Feb 19, 1945Sep 20, 1949Eugene J ReardonFinger hole insert for bowling balls
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2856679 *Jul 26, 1956Oct 21, 1958Jr William E BurkhardtMethod of relocating the finger holes in bowling balls
US3143901 *Sep 27, 1961Aug 11, 1964Charles E BawtinheimerMethod of forming workpieces
US3214167 *Oct 8, 1962Oct 26, 1965Pell Kalman LFinger-tip gripping aid for bowlers
US3247841 *May 29, 1961Apr 26, 1966Cook Galen BDiagnostic method
US3316588 *Nov 9, 1964May 2, 1967Don S Sports Systems IncPliable molding tool
US3386176 *Dec 27, 1965Jun 4, 1968Russell P. LottaCustom fitting of bowling balls
US3774909 *Jun 3, 1971Nov 27, 1973Linden CBowling ball
US4030414 *May 16, 1975Jun 21, 1977Mcguire James TWall decorating paint applying device
US4260574 *Apr 9, 1979Apr 7, 1981Macomson James BMethod of making an ornamental replica of a hand
US4381863 *Jul 13, 1981May 3, 1983Master Industries, Inc.Finger hole insert for bowling balls
US5076438 *Apr 11, 1990Dec 31, 1991Aronson Michael DServing tray with an underside molded to the contour of the hand of the server
US5391117 *Jan 8, 1993Feb 21, 1995Miller; John R.Bowling ball
US5657972 *Dec 22, 1994Aug 19, 1997Isi Norgren, Inc.Clamp with inflatable bladder
US5769730 *Dec 9, 1994Jun 23, 1998Haskell; RogerBowling ball fingertip positioner
US5813918 *Nov 4, 1996Sep 29, 1998X-Act Duplicator, Inc.Method of exactly duplicating in a new bowling ball, the thumb-hole of a reference bowling ball
US6464924 *Apr 5, 2000Oct 15, 2002W. Keith ThorntonMethod of forming a custom mask using an impression mask
US7243650Jul 12, 2004Jul 17, 2007Thornton W KeithCustom fitted mask configured for coupling to an external gas supply system and method of forming same
US7677889Jul 30, 2007Mar 16, 2010Thornton W KeithDevice and method for forming a custom oral appliance
US7721741May 22, 2009May 25, 2010Thornton W KeithOral appliance for treating a breathing condition
US7963284Aug 18, 2004Jun 21, 2011Airway Technologies, LlcCustom fitted mask and method of forming same
US8020276Nov 29, 2007Sep 20, 2011Airway Technologies, LlcSystem and method for custom-orienting a medical mask to an oral appliance
US8236216Jun 26, 2007Aug 7, 2012Airway Technologies, LlcSystem and method for forming a custom medical mask using an orientation device
US8316858Jun 7, 2010Nov 27, 2012Airway Technologies, LlcSystem for coupling an oral appliance to a medical mask
US8607796Feb 25, 2010Dec 17, 2013Airway Technologies, LlcApparatus and method for coupling an oral appliance to a gas delivery device
US8874251Jun 26, 2007Oct 28, 2014Airway Technologies, LlcSystem and method for forming a custom medical mask from a three-dimensional electronic model
US20080032256 *Jul 30, 2007Feb 7, 2008Thornton W KeithDevice and Method for Forming a Custom Oral Appliance
US20090223525 *May 22, 2009Sep 10, 2009Thornton W KeithOral Appliance for Treating a Breathing Condition
U.S. Classification264/222, 473/130, 16/430, 264/319, 623/66.1, 16/110.1, 264/DIG.300, 264/317
Cooperative ClassificationY10S264/30