US3810619A - Bowling ball and method of closing and opening a cavity opening therein - Google Patents

Bowling ball and method of closing and opening a cavity opening therein Download PDF

Info

Publication number
US3810619A
US3810619A US00294645A US29464572A US3810619A US 3810619 A US3810619 A US 3810619A US 00294645 A US00294645 A US 00294645A US 29464572 A US29464572 A US 29464572A US 3810619 A US3810619 A US 3810619A
Authority
US
United States
Prior art keywords
ball
cavity
cap
recess
spherical
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 - Lifetime
Application number
US00294645A
Other languages
English (en)
Inventor
W Taylor
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US00294645A priority Critical patent/US3810619A/en
Priority to JP48110644A priority patent/JPS4972018A/ja
Application granted granted Critical
Publication of US3810619A publication Critical patent/US3810619A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B37/00—Solid balls; Rigid hollow balls; Marbles
    • A63B37/0001—Balls with finger holes, e.g. for bowling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49712—Ball making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49945—Assembling or joining by driven force fit

Definitions

  • the system generally comprises a typical bowling ball having an elongate cavity extending inwardly generally radially a predetermined distance toward the center and a cap fitted at its outer end to restore the contour of the ball.
  • the axis of the cavity usually extends at a substantial angle to the plane generally including the thumb and finger holes, and it may be left empty or filled with a weighting mass eg. a barium compound, to vary the weight and performance characteristics of the ball.
  • the cap is disc-like with a spherical outer surface to match the contour of the ball and has at least one recess in the marginal portion extending inward toward the axial center.
  • the diameter of the disc is slightly more than that of the outer end of the cavity to produce an interference or force fit so that it cannot be removed without destroying it, thus preventing unauthorized weight changes from going unnoticed.
  • a hole is drilled in the cap large enough to intersect the recess, leaving a ring which may be easily snapped out because of the great reduction in hoop compression force.
  • a bowling ball is a virtual gyroscope in action because it spins about an axis transverse to the general plane which includes the thumb and finger holes.
  • the spin may be directly down the lane or at some angle to it depending on the manner of release.
  • the spin rate does not normally correspond to the rate of forward motion at release and therefore the ball skids during the major portion of its travel and begins to roll shortly before it reaches the pins.
  • Players have taken advantage of this fact by delivering the ball in such fashion that it will hook when the roll starts, and the ball will arrive at the head pin at an angle to the axis of the lane.
  • a system for enhancing the hooking action of the ball consists in forming a cavity in the ball at the side of the plane through the thumb and finger holes which corresponds to the direction of the desired hook and installing a weight in the cavity.
  • the gravity moment of the weight during the skidding travel of the ball down the lane will cause a precession in the proper direction for the hook and, when the roll starts, the ball will travel at an angle toward the head pin.
  • the mass of the weight and its moment arm determine the amount of precession.
  • the same amount of weight is not suitable for all circumstances. Different lane conditions may require a different weight for the same bowler. Different bowlers deliver the ball differently and they need different weights. In some cases it is desirable to form a cavity and leave it empty to obtain the desired characteristics.
  • a cap over the cavity is needed both to retain the weight and to restore the contour of the ball. If the cap is permanently secured, as by cementing, it is not possible to change weights. If it is readily removable, then it is possible to remove it and make unauthorized weight changes without detection. Furthermore, it is possible for the cap to become loose during play and fall out with resulting loss of the weight.
  • the present invention preserves the desirable benefits mentioned above while avoiding the disadvantages and provides a system which insures security of a weight in the ball, allows authorized changes to be made, and prevents unauthorized changes from being made without detection.
  • the system involves forming a hole in the ball at the desired location and to the desired depth to define a cavity for reception of a weighting mass.
  • the cavity may be formed by drilling.
  • a mass of the desired weight is provided and has approximately the same dimensions as the cavity, the diameter of the mass being just enough less than that of the cavity for a sliding fit to facilitate removal while avoiding undesirable looseness.
  • a cap is provided to fill the outer portion of the cavity to hold the mass in place and also prevent its removal.
  • the cap is disc-like and preferably cylindrical in outline, having a diameter several times as great as its thickness.
  • the inner surface preferably lies generally in a plane while the outer surface is spherical to match the contour of the ball.
  • the diameter of the cap is slightly greater than that of the outer portion of the cavity so that it will be an interference fit, and the cap is driven inward until it is flush with the surface of the ball. Since it is force-fitted and has nothing on its outer surface to grip and remove it, the cap cannot be non-destructively removed, thus preventing unauthorized weight changmg.
  • the marginal portion of the cap is provided with at least one recess extending generally radially inward from the edge a predetermined distance toward the axis of the cap. While the recess may take various forms, it is presently preferred to make it generally rectangular in cross section, stopping short of the outer surface but having a depth in the axial direction of more than half the thickness.
  • the first step in removal is to drill an axially central hole through the cap of sufficient diameter to intersect the recess. This leaves an outer ring having a peripheral gap through most of its thickness which greatly reduces the hoop compression resistance of the ring and correspondingly reduces the binding engagement between the walls of the cap and the cavity. Removal is completed by inserting the tip of a removal tool in the pocket formed by the recess and the outer portion and snapping the ring out of position.
  • FIG. 1 is a top plan view of a typical bowling ball having a side cavity to receive a weighting mass
  • FIG. 2 is a schematic exploded view of the mass and cap about to be inserted in the cavity
  • FIG. 3 is a schematic side view, partly in section of the mass and cap in place in the cavity;
  • FIG. 4 is a view similar to FIG. 3 with a modified cavity and mass
  • FIG. 5 is a view similar to FIG. 3, showing the drilling operation
  • FIG. 6 is a schematic perspective view of the remaining ring after the drilling operation.
  • FIG. 7 is a view similar to FIG. 3, showing the removal operation.
  • a typical bowling ball I0 illustrated in FIG. 1, is provided with a thumb hole 12 and finger holes 14, and the line 16 indicates the vertical central plane of the ball.
  • a cavity 18 is formed in the ball by drilling. It extends generally radially inward at a substantial angle to the central plane to a predetermined distance to receive a weighting mass. It need not be exactly perpendicular to the plane, and also it need not be exactly radial although such attitude is preferred for simplicity.
  • the mass used in the present invention comprises a capsule 24 having end caps 26 bonded to the capsule, the latter containing a finely divided material having a density Substantially greater than the density of the bowling ball material.
  • a barium compound, preferably barium sulfate, is used and it is mixed with sufficient binder to render it a solid mass to prevent any of it from escaping from the capsule.
  • a synthetic resin such as epoxy resin, is used as the binder.
  • the capsule enclosure prevents breaking or partial disintegration of the mass in handling and insures accuracy in sizing.
  • the capsule, or its end caps if they extend radially outward, is made approximately .005 inch less than the diameter of the cavity for ready removalwhile avoiding undesirable looseness in place. It will be understood that the cross sec tion of the cavity and the capsule may be other than circular but they are preferably made circular for simplicity and ease of construction.
  • the cavity may be uniform from end to end but preferably the lateral dimension of the outer portion 28 is slightly larger than that of the main portion to define a shoulder 30 at a predetermined radial distance from the surface of the ball, the shoulder serving as a limiting stop for insertion of the cap.
  • the cap itself is an integral body and may have any parametric outline but preferably it is disc-like with a diameter several times as great as its thickness and with a cylindrical periphery or margin 32. It is formed of a suitable high impact plastic and its inner surface 34 may be flat or provided with various molding reliefs. In any event it lies generally in a plane.
  • the outer surface 36 is spherical to match the contour of the ball.
  • the diameter of the cap is about 0.015 inch greater than the diameter of the outer portion 28 of the cavity to produce an interference fit, and when it is driven into place it cannot be non-destructively removed. A tighter fit tends to split off portions of the ball and a looser fit does not provide adequate retention.
  • Axially directed knurling 44 on margin 32 facilitates the force-fitting operation.
  • the bottom, or inner end, 38 of the cavity may be flat in a plane transverse to the axis as shown in FIG. 3 when the cavity is formed by molding, it is more often conical as shown at 40 in FIG. 4 because the hole is usually drilled at a selected point after the ball is analyzed and the desired characteristics are determined.
  • the cone at the inner end corresponds to the conical tip of the drill. Accordingly the capsule 24 is formed with one conical end 42 to match cone 40.
  • the cap cannot be removed without destroying it because it is force-fitted into place and there is nothing on its outer surface which can be gripped to pull it out. It will not come out inadvertently because of its tight fit. An unauthorized removal for a weight change is readily detectable.
  • Authorized removal is made possible by the special formation provided in the marginal portion of the cap to reduce the binding engagement between the walls of the cap and the outer portion of the cavity in response to removal of the axially central portion of the This formation comprises a recess 46 formed in the marginal portion 32 of the cap.
  • the recess extends generally radially inward from margin 32 toward the axis of the cap for a predetermined distance, and from the inner surface to a point short of the outer surface.
  • radial extent of the recess is preferably from about 15 7 percent to about 25 percent of the diameter and its depth in the axial direction from the inner surface is about percent to percent of the thickness of the cap.
  • the cross section of the recess may take any suitable form but is preferably rectangular.
  • FIGS. 5 to 7 The removal operation is illustrated in FIGS. 5 to 7.
  • a cylindrical core drill 48 is operated to cut out the axially central part of the cap and is of such size that the hole which it forms will intersect the inner portion of recess 46.
  • the result is the ring shown in FIG. 6, and the recess or its remainder, now defines a parametric or circumferential gap which greatly reduces the hoop compression resistance of the ring, and thus its resistance to removal.
  • a removal tool 50 such as a screw driver or a hook
  • shoulder 30 serves as a depth limiting stop. Its depth is the same as the height of margin 32 so that when the cap bottoms on the shoulder it will be flush with the surface of the ball.
  • the length of capsule 24 accurately matches the depth of cavity 18, so that the cap contacts the capsule and prevents any movement radially of the ball.
  • a bowling ball comprising: a spherical ball formed with an elongate weight receiving cavity extending generally radially inward from its spherical external surface to a predetermined depth less than the radius of the ball; and
  • a disk-like cap having a smooth outer surface closing the outer end of said cavity and secured with a friction tight fit in the outer end of the cavity with its inner surface adapted to engage a weight mass in the cavity, and its outer surface spherical and flush with the surface of the ball to maintain its normal contour, a marginal portion of the cap having a recess sunk radially inwardly to a predetermined depth therein, in back of the spherical outer surface of the cap, so that it can subsequently be intersected by a large bore drilled generally axially through the cap to form a readily removable ring, with a remainder of said recess therein to reduce hoop compression and thereby enable easy removal.
  • a ball as claimed in claim 1 including a weight mass in the form of a capsule containing finely divided material having a substantially higher density than the density of the material of the ball.
  • 6 mined depth comprising:
  • a disclike cap having a recess in its marginal portion extending inward a predetermined distance toward its axial center to close the cavity and restore the contour of the ball;

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Closures For Containers (AREA)
US00294645A 1972-10-03 1972-10-03 Bowling ball and method of closing and opening a cavity opening therein Expired - Lifetime US3810619A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US00294645A US3810619A (en) 1972-10-03 1972-10-03 Bowling ball and method of closing and opening a cavity opening therein
JP48110644A JPS4972018A (enrdf_load_stackoverflow) 1972-10-03 1973-10-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00294645A US3810619A (en) 1972-10-03 1972-10-03 Bowling ball and method of closing and opening a cavity opening therein

Publications (1)

Publication Number Publication Date
US3810619A true US3810619A (en) 1974-05-14

Family

ID=23134319

Family Applications (1)

Application Number Title Priority Date Filing Date
US00294645A Expired - Lifetime US3810619A (en) 1972-10-03 1972-10-03 Bowling ball and method of closing and opening a cavity opening therein

Country Status (2)

Country Link
US (1) US3810619A (enrdf_load_stackoverflow)
JP (1) JPS4972018A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5037096A (en) * 1990-04-23 1991-08-06 Pinel Jr Maurice L Bowling ball weight block
US5215304A (en) * 1991-04-24 1993-06-01 Morich Enterprises Incorporated Bowling ball
US9061178B1 (en) 2012-05-17 2015-06-23 Ebonite Holdings, Inc. Bowling ball and methods of manufacturing same utilizing one or more sacrificial molds

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6239751U (enrdf_load_stackoverflow) * 1985-08-29 1987-03-10
WO2020090043A1 (ja) * 2018-10-31 2020-05-07 株式会社ラウンドワン ボウリングボール、ボール本体、装着型ウェイト

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US626584A (en) * 1899-06-06 wilmerling
GB191120863A (en) * 1911-09-21 1912-07-04 Robert Thomson Devlyn Improvements in and relating to Bowling Green Bowls.
US1436738A (en) * 1922-03-27 1922-11-28 Betts Electric & Mfg Corp Venting washer
GB346671A (en) * 1930-01-14 1931-04-14 Louis Newell Senour Improvements in golf clubs
US1849414A (en) * 1930-12-02 1932-03-15 Turnbull William James Amusement device
US2121197A (en) * 1936-07-01 1938-06-21 Ridge Tool Company Of Elyria Screw extractor
US2198981A (en) * 1938-08-12 1940-04-30 John F Sullivan Weight regulator for golf club heads
US2460445A (en) * 1948-04-19 1949-02-01 Charles W Bigler Adjustable weight for golf club heads
US2607956A (en) * 1947-06-27 1952-08-26 Lee N Brutus Method of making threaded locking devices
US3441274A (en) * 1965-06-17 1969-04-29 John W Collins Bowling ball

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US626584A (en) * 1899-06-06 wilmerling
GB191120863A (en) * 1911-09-21 1912-07-04 Robert Thomson Devlyn Improvements in and relating to Bowling Green Bowls.
US1436738A (en) * 1922-03-27 1922-11-28 Betts Electric & Mfg Corp Venting washer
GB346671A (en) * 1930-01-14 1931-04-14 Louis Newell Senour Improvements in golf clubs
US1849414A (en) * 1930-12-02 1932-03-15 Turnbull William James Amusement device
US2121197A (en) * 1936-07-01 1938-06-21 Ridge Tool Company Of Elyria Screw extractor
US2198981A (en) * 1938-08-12 1940-04-30 John F Sullivan Weight regulator for golf club heads
US2607956A (en) * 1947-06-27 1952-08-26 Lee N Brutus Method of making threaded locking devices
US2460445A (en) * 1948-04-19 1949-02-01 Charles W Bigler Adjustable weight for golf club heads
US3441274A (en) * 1965-06-17 1969-04-29 John W Collins Bowling ball

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5037096A (en) * 1990-04-23 1991-08-06 Pinel Jr Maurice L Bowling ball weight block
US5215304A (en) * 1991-04-24 1993-06-01 Morich Enterprises Incorporated Bowling ball
US9061178B1 (en) 2012-05-17 2015-06-23 Ebonite Holdings, Inc. Bowling ball and methods of manufacturing same utilizing one or more sacrificial molds
US9480879B1 (en) * 2012-05-17 2016-11-01 Ebonite Holdings, Inc. Bowling ball and methods of manufacturing same utilizing one or more sacrificial molds

Also Published As

Publication number Publication date
JPS4972018A (enrdf_load_stackoverflow) 1974-07-11

Similar Documents

Publication Publication Date Title
US1960110A (en) Golf club
US2225930A (en) Golf club
US2261959A (en) Golf club and attachment therefor
US4905999A (en) Practice golf tee
US2051083A (en) Golf shaft balancer
US2470817A (en) Flexible golf tee
US5221090A (en) Golf tee
US3516664A (en) Golf tee holder
US4418916A (en) Tilt top gulf tee
US3074719A (en) Tee driving means
US20120065000A1 (en) Golf Tee with Support Prongs
US2472978A (en) Universal golf club head
US3810619A (en) Bowling ball and method of closing and opening a cavity opening therein
JP2008043720A (ja) ゴルフティー
US3680870A (en) Weight attachment for golf clubs
US2976046A (en) Golf club
US4902016A (en) Golf club head having a high friction striking surface
US3804412A (en) Taper lock inserts for thumb and fingers in bowling balls
US3905525A (en) Ball marker holder for golf
IE852381L (en) Upright cylindrical containers.
US3169766A (en) Bowling pin
US2589763A (en) Golf tee
JPH05212142A (ja) ゴルフティー
US3458206A (en) Golf ball core
US5522774A (en) Bowling ball with top weight and ceramic core