Abstract: A substantially improved table soccer/fussball game playing ball is fabricated by molding an oversized spherical blank entirely from a single thermoplastic material, preferably a urethane material having a hardness within the approximate range of from about 50 Shore D to about 60 Shore D. The oversized molded blank is then subjected to a precision surface machining process, preferably using a centerless grinding machine, to reduce its diameter to a desired finished magnitude and to provide the resulting finished playing ball with a very precisely spherical shape. Compared to conventionally fabricated table soccer playing balls, the machined, single thermoplastic material playing ball provides a variety of advantages including a truer playing roll, considerably more durability and resistance to surface wear, and the desirable ability to retain its "like-new" playing characteristics for a much longer period of time.

Abstract: A training device for improving one's putting stroke has a long, slender rigid bar attached to the shaft of a putter. The bar is rigidly attached to extend rearward in an orientation perpendicular to the face of the head of the putter. A resilient, flexible line is attached to the bar. The line has one end adapted to be anchored to a stationary point, to maintain proper alignment of the putter face during a practice putting stroke. In another embodiment, a base is fixedly attached to the shaft, and a telescoping tube is hingedly connected to the base to allow vertical movement, but prevent lateral movement or rotation of the shaft during the practice stroke. In another embodiment, a base includes a flat end flange for vertical pivotal attachment by a clevis hinge to a long rigid rod, which passes through a stationary eye. Also included is a movable L-shaped member for establishing a proper angle for holding the putter.

Abstract: An improved golf training aid is provided having a rotatable T-shaped pointer mounted to a block. The block has two sections that are fastened together by screws. The screws tighten or loosen the grip on the golf club shaft. The T-shaped pointer is mounted in another slit passageway, one leg acting as the axis of rotation. Screws also act to hold the pointer in place. When not in use, the pointer can be rotated up for easy storage.

Abstract: A putting trainer device which attaches to a standard putter at the grip and ensures a consistant angle between the putter's arm and the putter itself to develop "muscle memory" after a period of continuous use and continuation of the consistent arm to putter angle even when the device is not continually used. The device includes an attachment member which runs along the grip of the putter, terminating in a J-hook shaped member designed to engage a hole found in the top of a standard putter grip.

Abstract: A durable wooden golf club head is disclosed having a hitting face with a non-wooden durable insert that is screw threaded into the head whereby the wooden head and face are protected from deterioration upon impact by a golf ball. The wooden head is made by screw threading the insert into a matching socket and causing a hardenable liquid adhesive to hydraulically penetrate the head from the socket to the surface of the wood whereby the head provides a solid golf ball hitting body.

Abstract: An improved golf ball which includes a golf ball main body, and large dimples having a large diameter A and small dimples having a small diameter B which are formed in a large number on the peripheral surface of the golf ball main body. The large and small dimples are provided in the ratio of the diameters A/B within the range of 1.25 to 1.50.

Abstract: A non-wound three piece golf ball which includes a spherical center, an intermediate mantle of elastomeric material covering the center and a molded cover forming the outside surface of the ball. The golf ball has the performance and feel of a three-piece ball. The golf ball has physical specifications which include diameter, 1.680-1.695 inches; hardness (Shore C) 60-95; and coefficient of restitution 0.695-0.810. The center comprises 90-100 parts by weight cis-1, 4 polybutadiene, 20-35 parts by weight cross linking agent, and 10-30 parts by weight filler. The mantle comprises from 90-100 parts by weight cis-1, 4 polybutadiene, 0-10 parts by weight natural rubber, 35-40 parts by weight cross-linking agent and 1-4 parts by weight filler.

Abstract: The club provides a larger permissible area of impact for striking a golf ball accurately in both direction and distance by having a lightweight upper section and a heavy sole plate section giving a centre of gravity which is low down in relation to the height of the head of the club and which is positioned towards the toe end of the head remote from the entry point of the shaft which is towards the heel of the club. The position of the centre of gravity and the swing weight of the club are adjustable by means of additional weights which may be attached within the hollow upper part of the club.

Abstract: In production of a wood-type golf club head having a rigid shell, metal pieces are dispersed in the matrix of crude foamable synthetic resin filled in the interior of a crude rigid shell for long maintenance in position of the center of gravity of the product despite shocks at shooting balls. The golf club head is formed of a hollow shell having a sole side provided with a first opening. A lid is received within the first opening to form an enclosure. The lid includes a second opening in direct communication with the interior of the hollow shell. The synthetic resin is provided within the interior of the hollow shell through the second opening within the lid. The synthetic resin forms a foam core upon application of heat to the resin.

Abstract: A golf ball having a plurality of different kinds of dimples formed on a spherical surface thereof is disclosed. In one embodiment, a plurality of four different kinds of dimples is formed on the spherical surface of the golf ball. The differences between the kinds of dimples can be a difference in diameter, in depth, or a combination of diameter and depth. The ratio of the product of the diameter and the depth of the largest dimple, to the product of the diameter and depth of the smallest dimple, is in the range of 1.5 to 2.0. Smooth portions are formed on the remainder of the spherical surface to such a size that a dimple having an area larger than an average area calculated from the respective areas of each kind of dimple constituting the plurality of different kinds cannot be formed. The total number of dimples ranges from 300 to 560, and there is a maximum of one great circle zone not traversing a part of any dimple.

Abstract: A golf club head includes a body having a front face which is adapted to engage a golf ball, the front face being disposed at an acute angle relative to vertical when a player addresses the ball by viewing the golf club head when the golf club head is in a position to engage the golf ball. The front face has an upper edge portion which is chamfered to form a chamfer face which is disposed at an obtuse angle relative to the front face. The chamfer face has an upper edge which defines the upper boundary of the head body while the front face has a lower edge which defines the lower boundary of the head body. The chamfer face and the front face are disposed such that when a player addresses the ball, the player perceives the plane extending between the upper and lower edges as the ball-engaging plane such that the player thereby perceives the loft angle to be greater than the actual loft angle, the actual loft angle being the acute angle of the front face relative to vertical when a player addresses the ball.

Abstract: A golf club head has a front face, bottom and top surfaces, and a keel extending generally forwardly at the bottom of the head. The keel has a forwardmost surface sloping upwardly and forwardly from the bottom of the keel, to intersect the front face at a lateral linear location substantially above the bottom level of the keel, whereby the keel sloping surface on striking the ground during a golf swing will transfer some force upwardly toward the head.

Abstract: A method and apparatus for determining the point of impact of a golf club head on a golf ball such as one having an outer coating of polyurethane resin containing aluminosilicate and titanium dioxide, such as for use in improving a golfer's swing. A golf club head is provided having an impact surface on which an indication of the impact of the head against the ball is retained subsequent to the impact. In the disclosed embodiment, the impact surface portion is formed of fiberglass fibers, carbon fibers, and a binder. The indication is erasable as by the golfer wiping his finger across the thusly marked impact surface. A golf club head composition and golf ball coating cooperatively providing the desired impact indication are disclosed.

Abstract: A sighting device for a golf putter comprises a mounting frame housing an eye aligning mirror having a horizontally disposed reflective surface and a ball and target aligning mirror having a reflective surface extending at an angle of approximately 135.degree. to the putting face of the putter blade. The frame includes a front flange which extends downwardly over the putting face of the blade. The device is releasably mounted on the blade by a deformable bonding agent which fills a chamber defined by the rear face of the flange, the striking face of the putter and spaced-apart ribs extending rearwardly of the flange to engage against the striking face. A pair of lugs extend sidewardly of the frame and each is formed with a through hole in which an adjusting screw for adjusting the position of the device on the putter blade are threadingly engaged.

Abstract: A set of golf club shafts that are produced wherein the torsional stiffness of each shaft within the set as a function of its length, be within 5% of a straight line having a gradient lying between zero and a positive value. Each shaft of the set of golf club shafts is formed of a desired length with the outer diameter and thickness of each shaft being varied throughout its length from the large diameter hand gripping end portion through the central stepped portion to the small diameter end or head portion. The clubs of a set are fabricated to the required torsional stiffness with the clubs of a set matched with regard to torsional stiffness.

Abstract: A method of configuring a stepped, cylindrical golf club shaft to achieve an optimum shaft impact angle is diclosed. A predetermined portion in the middle of the shaft is selected as are the number of steps to be used, the wall thickness of each step and the outer diameter. For each configuration which has the selected number of steps the deflection at a predetermined point is calculated when a load is applied at another point. For those deflections which fall within a desired predetermined range of deflections, the slope of the bending angle of the shaft is calculated at the point of deflection. A configuration is then selected which has a desired slope and a golf club shaft is made with the middle portion configured to provide the desired bending angle. Specific configurations for maximum bending angle are provided for both wood-type and iron-type golf clubs.