Abstract: A pin for playing ninepins or for bowling is provided. The base portion of the pin is detachable from the pin body and is replaceable. The base portion comprises a material that is more robust, wear resistant and/or has a higher resistance to scoring than does the remainder of the pin. The base portion can be provided with a reinforcement. The base portion has an annular support surface with at least one radially extending notch, a sharp inner edge, and high static friction to effect an improved ground adhesion.

Abstract: A plastic pin having a porous and/or cellular core that is surrounded by a resilient shell is provided. The base of the pin is made of a different material than is the shell. The base is centrally provided with a plug that projects into the core. To improve the connection between the shell and the base, the outer side of the plug is provided with projections that form a positive connection with the core.

Abstract: A bowling pin and method for playing a bowling game. The bowling pin includes a cylindrical section which straddles the location at which the ball contacts the pin. Several alternate scoring methods are disclosed for both sport and recreation.

Abstract: The outer two layers, composed of an undercoat of an ionomer and a topcoat of polyurethane, on a wooden core of a bowling pin are bonded together by use of either of a polyfunctional aziridine or polyfunctional carbodiimide providing superior adhesion under shock plus several shop advantages including lessened air pollution and ease of application.

Abstract: A bowling pin has a pin body with a head and a magnet, at least partially enclosed in a plastic envelope, positioned in the head for manipulating the bowling pin. The plastic envelope and the head are fused to one another by rotating the plastic envelope within a cutout of the head so that the contact surfaces are heated for softening and fusing the material.

Abstract: The base structure of a bowling pin having an aperture at the center of the base portion thereof for the engagement with the bottom portion of the core of the bowling pin, characterized in that an inner wall is circumferentially provided around the aperture and an outer wall is provided concentrically adjacent to the inner wall, and a circular slot is formed by the inner wall and the outer wall; the outer surface of the outer wall is provided with a plurality of screw threads and at least a pair of transverse hole are provided perpendicular to the circular slot so that the outer surface of the outer wall communicates with the circular slot, whereby a resin solution covers the plurality of the screw threads and flows into the slot, and forms a compact base structure.

Abstract: Bowling pins formed by molding a plastic shell about a foamed plastic core have not heretofore come into practical use because of inability to withstand shocks in service, resulting in separation of the shell from the core. According to the present invention, a foamed thermoset (non-melting) copolymer is employed for casting the core. Thereafter, before casting a plastic shell thereabout, the core surface area is substantially increased by simply removing the core surface skin, thereby opening the outermost thermoset core cells for filling by the shell material.

Abstract: A method for forming a plastic composite bowling pin includes removing the surface skin of a foam core, mounting a plastic base ring on such core, and molding a relatively thick elastomer shell around the prepared core and the base ring so that the hardening of the shell interlocks the shell, core and base ring. A pin made by this method is easily refurbished by removing the base ring and part of the shell and re-molding the surface of the shell.