Abstract: A putter-type club head (20) having a central aperture (32) with a rearward center of gravity is disclosed herein. The putter-type club head (20) has a body (22) that is preferably composed of stainless steel. The body (22) has a face portion (24), a crown portion (26), a sole portion (28) and an aft-mass portion (30). The face portion (24), the crown portion (26), the sole portion (28) and the aft-mass portion (30) define the central aperture (32). The crown portion (26) extends rearward from the face portion (24) over the aft-mass portion (30). The central aperture (32) separates the crown portion (26) from the sole portion (28) and the face portion (24) from the aft-mass portion (30). The crown portion (26) has an alignment means (40) thereon for aiming a golf ball during putting.

Abstract: A putter is precision machined to form a concave horizontal face from the heel to toe of the hitting face. The curvature of the concave horizontal face may range from an arc of a five circle to an arc of a one-feet radius circle with the center point at the center of the hole. Thus the putter has a curvature of the horizontal or striking face ranging from the reciprocal of five feet to the reciprocal of one foot. Also provided in accordance with the present invention is a marking on the club head of the putter, the marking serving to assist with both aiming and centering. The marking is an arc of a concentric circle of the golf ball in front of the putter face and has a radius of curvature which is a function of the radius from the center point of a golf ball abutting the striking face. The marking may be used on putters having regular, non-concave striking faces.

Abstract: A putter type golf club head including a heel, toe, ball striking face, upper surface, bottom sole surface and slotted rear portion, including a lower, rearwardly extending flange; and an upper, rearwardly extending flange. The mass of the upper flange is substantially greater than the mass of the lower flange, whereby the club head's center of mass is located toward the upper surface. The upper and lower flanges are formed by a longitudinal slot extending in a heel to toe direction. The upper flange is formed with a semi-circular opening centrally located behind the ball striking face and midway between and separating the heel and toe. The bottom sole of the club head is provided with a bounce angle which raises the leading edge above the putting surface to eliminate scuffing of the club head on the ground during the execution of a putting stroke.

Abstract: A golf putter has a putter head which is ring shaped with a flattened front wall defining a striking face. A hosel is supported by a web cantilevered from a rear wall to locate the hosel at the center of mass of the putter head, to minimize any tendency for twisting as the ball is struck. Sighting marks are recessed into the web and at the top center of the front wall.

Abstract: A retractable amusement ball device includes a retract assembly. The retract assembly includes a recoil mechanism. A rope or cord is attached to the recoil assembly at one end. The other end of the cord may include a handgrip assembly such as a knob, a ring, or a handle. When the retractable amusement ball device is at rest, the cord is wound about the recoil assembly. The handgrip assembly comes to rest against an exterior of the retractable amusement ball device. When a participant plans to launch the retractable amusement ball device, the participant grips or grabs the handgrip assembly and pulls the cord into an extended position. A force is applied to the ball through the extended cord and handgrip mechanism. When the participant releases the handgrip assembly, the recoil mechanism rewinds the cord back into the retract assembly as the retractable amusement ball device is propelled through the air.

Abstract: A golf putter has the hitting face with horizontally concave surfaces. The curvatures of the concave horizontal faces range arcs of five to one-foot radius circles.

Abstract: A practice golf club putter comprising a grip to be held by the hands of a golfer. An elongated shaft extends from the grip. A putter head is provided having a convex striking surface. A facility is for securing a lower end of the shaft to the putter head. The convex striking surface of the putter head can stroke a golf ball, to make the golf ball roll in a straight line upon a putting green.