Abstract: A bowling pin defined primarily by a main one-piece plastic body part which defines the outside configuration of the pin and has a substantially planar base surface on the lower end thereof. A bore arrangement extends coaxially upwardly within the interior of the main body part and terminates just short of the upper end of the pin. A plug closes off the lower end of the bore arrangement. The closed bore arrangement includes a cylindrical bore of large diameter which is found is the base portion of the pin and projects upwardly to a location substantially at the elevation of the maximum pin diameter, from which a significantly reduced diameter bore projects upwardly to a further bore which is somewhat larger and is located adjacent the upper extremity of the base portion of the pin. A further smaller diameter bore thence projects upwardly through the neck portion of the pin and to the head portion so as to terminate at a wall spaced slightly downwardly from the upper extremity of the pin.

Abstract: A prosthetic joint for replacing a finger joint, including a shell-like member which is secured to the distal end of one phalanx, this shell-like joint having a vertical cross section which resembles a semicylindrical shell. The shell preferably has parallel legs extending rearwardly from the edges of the semicylindrical portion, with the lowermost leg having a greater rearward extension. The shell has a transverse cross section which results in two convex bearing surfaces symmetrically positioned relative to the central vertical plane of the shell. These convex bearing surfaces define a groove therebetween at the central vertical plane. The other joint member includes a tack portion which extends into the other phalanx, which tack portion has an enlarged head provided with a concave bearing surface for engagement with the exterior bearing surface on the shell.

Abstract: A separator for blow-molded parts, which separator includes a plurality of endless belts movably supported between a pair of horizontally spaced pulleys, one of which is a drive pulley. The belts, preferably of circular cross section, have upper reaches extending in approximately parallel but sidewardly spaced relationship to define small gaps therebetween through which scrap parts can pass. The other parts remain on the belt and are transported to a discharge location. The adjacent belts are preferably driven at slightly different speeds to facilitate agitation and dislodgement of scrap parts so that they can move into and through the gaps. The ends of the belts are supported by rotatable end idler pulleys, alternate ones of which preferably have exterior belt-engaging profiles which are noncircular relative to the rotational axis to effect cyclic vertical displacement of the upper reaches of alternate belts.

Abstract: An endoprosthetic joint used to replace a dysfunctional thumb carpometacarpal joint comprises a first, or metacarpal, component adapted for insertion into the first metacarpal of the thumb and carrying thereon the ball portion of a ball-and-socket joint. In one embodiment, said joint further comprises a second or base portion of slightly flexible material defining a socket into which said ball is snappably received and having a projection thereon for reception into a suitably prepared recess in the trapezium bone of the hand. Both said components are cemented into place for firm holding therein. In a second embodiment, the metacarpal portion is identical with, and the base portion is generally similar to, that of the first embodiment.

Abstract: Prosthetic knee joint. A prosthetic knee joint is proposed which incorporates into a single product a variety of previously recognized desirable features. The joint in question has a generally cylindrically shaped knob on one component thereof and a receptacle for receiving said knob in the other component thereof. Said receptacle is designed for full engagement of said cylindrical knob less only the clearance required to permit the desired pivotal motion of said joint and the components defining said receptacle are arranged so that only shear stress is normally imposed on the screws by which the components defining said receptacle are assembled and the parts are further arranged in order that wide contact surfaces between the components of said prosthesis are provided for direct transmission of load between said components without a major portion thereof being transmitted through said joint.

Abstract: Tool for inserting a component of a prosthetic implant, primarily a component of a finger knuckle joint, said component having a joint portion and a prong portion. There is provided a tool having at one end thereof a suitable receptacle for receiving said joint portion and holding same firmly for inserting the prong portion of said implant as desired into a bone and then easily detaching said tool from the prosthesis. In the disclosed embodiment, the prosthesis has in its joint portion a somewhat cylindrical bearing part and the tool for handling same is provided with a generally cylindrical receptacle for receiving same with, however, one portion thereof cut out for the easy removal of the tool from said prosthesis.

Abstract: An endoprosthetic joint formed by head and socket members which are adapted to be implanted in a thumb or a finger and can be suitably snapped together. The socket member is provided with structure exteriorly thereof, such as a pair of outwardly projecting webs disposed on diametrically opposite sides thereof, for permitting the muscles, ligaments and tendons to be sutured to these webs to thereby positionally relate same to the implanted joint, whereby proper balancing in the tensions imposed on the muscles and tendons is achieved during pivoting of the digit.

Abstract: Wrist joint prosthesis. As a replacement for the joint in a human wrist, there is provided a prosthesis permitting both vertical motion, sidewise motion and rotary motion but preventing twisting motion around an axis projecting from and parallel with the lower forearm. For this purpose, there is provided a metal socket fitted with a prong receivable into a bone of the forearm. A plastic cup made of material self-lubricating with respect to such metal socket is fitted within said socket, snappable thereinto to resist but not prevent withdrawal therefrom and having a rectangular projection-and-slot relationship with said metal socket to permit relative motion with respect thereto in only a single plane.