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Publication numberUS580207 A
Publication typeGrant
Publication dateApr 6, 1897
Filing dateJan 20, 1896
Publication numberUS 580207 A, US 580207A, US-A-580207, US580207 A, US580207A
InventorsHenry Boemermann
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 580207 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)



No. 580,207. Patented Apr. 6, 1897.



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SPECIFICATION forming part of Letters Patent No. 580,207, dated April 6, 1897.

Application filed January 20,1896. Serial No. 576,245. (No model.)

To all whom it may concern:

Be it known that we, HENRY BOEMERMANN and OLE OLSEN, citizens of the United States, residing in Brooklyn, Kings county, New York, have invented certain new and useful Improvements in Tenpin-Balls, of which the following is a specification.

Our invention relates to balls used in playing the game of tenpins or bowls. Heretofore, so far as we are aware, these balls have always been spheres turned from hard wood, as lignum-vit2e, and provided with holes to receive the finger and thumb, called fingerholes. Such balls have several disadvantages which we seek to overcome by our invention: First, they wear out rapidly from constant chafing and hammering, thus becoming rough and losing their perfect spherical form; second, they are liable to shrink and crack from the dry heat of rooms; third, they are solid and necessarily increase in weight in direct proportion to their size, while it is often desirable to vary the sizes of the balls without varying their weight proportionately, and, fourth, owing to the gradual increase in the price of the wood from which such balls are turned the latter are becoming more and more costly.

Our invention overcomes these difficulties. In carrying out the invention we make two hollow hemispheres, of metal or other suitable hard material, and secure these hemispheres firmly together, face to face, so as to produce a perfect hollow sphere of the proper diameter and of the proper thickness to give the desired weight to the ball. This ball we provide with suitable fin ger-holes for the same purpose as those in the wooden balls.

In the accompanying drawings we have illustrated an embodiment of our invention in its preferred form.

Figure 1 is a transverse mid-section of the ball. Fig. 2 is a side elevation of the ball. Fig. 3 is a fragmentary view, showing a mode of securing the finger-hole sockets which is different from that seen in Fig. 1 Fig. 4 shows on a smaller scale a ball constructed according to our invention and weighted.

The ball is made up of two hollow hemispheres 1 1. These we prefer to strike up from steel of the proper thickness to give the desired weight to the ball. The margins of the hemispheres are trued up and rabbeted, so as to overlap, and these are then secured together firmly by brazing, soldering, screwing, or the like. In Fig. 1 the parts are shown as screwed together.

The finger-holes 2 2 are formed in one of the hemispheres. In Fig. 1 the construction represents two holes punched or bored in the metal of the ball, and sockets 3 3, stamped up from sheet metal and secured in the respective holes by expanding according to a method commonly employed for fixing boilertubes. These tubular sockets incline or c011- verge, being preferably arranged with their axes radial to the sphere, or nearly so. In order to form a less smooth and more agreeable surface to the fingers than that afforded by metal of the tubular sockets, these latter may be lined with leather at or some similar material, cemented to the metal, or the tubular sockets may be made from brass or other suitable metal and have a thin film of rubber placed on its surface and vulcanized in 311m. The covering at of Fig. 1 may be considered as of rubber, leather, or any similar soft material.

Fig. 3 represents the tubular sockets as screwed into the wall of the hollow ball from the inside. This must of course be done before the hemispheres are secured together.

The tubular sockets 3 are represented as closed at their inner ends 3 so that the ball cannot be filled or stuffed through the sockets for mischievous purposes.

It will be obvious that the two sections of the ball may be secured together in other ways than those above statedfor example, by passing a rod through it diametrically and riveting it at the ends, or this means may be used in addition to the fastening means already described. In Fig. at such a ball is shown, and this view shows also how a hollow ball of thin metal, compressed fiber, 850., may be weighted with a ball or weight 5 of lead or other metal, secured to a rod 6, which traverses the hollow of the tenpin-ball and occupies the center of the latter.

It will be obvious that a ball constructed as above described can be made of any desired dimensions, and that its weight will vary according to the thickness of the metal from which it is made.

ing diametrically therethrough and a weight fixedly secured in the center of said rivet, substantially as described. I 5

In witness whereof We have hereunto signed our names in the presence of two subscribing witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4372560 *Jul 16, 1981Feb 8, 1983Antonius John ITherapeutic game
US4802671 *Aug 11, 1987Feb 7, 1989Gentiluomo Joseph ABowling ball
US5002276 *Mar 23, 1990Mar 26, 1991Davalor Mold CorporationBowling ball finger insert
US5007640 *Apr 23, 1990Apr 16, 1991Bernhardt David AFinger insert for a bowling ball
US5058901 *Jun 20, 1990Oct 22, 1991Salvino Carmen MSpin axis weighted bowling ball
US5123644 *Jan 31, 1991Jun 23, 1992Davalor Mold Corp.Finger insert for a bowling ball
US5176378 *Feb 14, 1992Jan 5, 1993Davalor Mold CorporationFinger insert for a bowling ball
US5308061 *Dec 10, 1992May 3, 1994Davalor Mold CorporationFinger insert for a bowling ball
US5437579 *Aug 1, 1991Aug 1, 1995Salvino; Carmen M.Spin axis weighted bowling ball
US5542660 *Feb 10, 1994Aug 6, 1996Di Cione; GiuseppeHand held spherical gaming device
US6736734Aug 20, 1999May 18, 2004David A. BernhardtBowling ball finger grip
US6837796Feb 3, 1998Jan 4, 2005David A. BernhardtBowling ball finger grip
Cooperative ClassificationA63B37/0002