Golf practice apparatus

Abstract

A golf practice device uses magnetic attraction to implement a ball return function. A ball is fastened to a tether coupled to a post enabling the ball and tether to rotate in a plane around the post when the ball is struck by a golf club. The plane of rotation is at a non-zero angle relative to the ground plane to simulate a launch angle. The magnetic coupling causes the ball to come to rest in the same general position on the playing surface following the rotation. The device is adapted for temporary attachment to a playing surface such as a typical artificial grass mat, and the ball may be a hollow, plastic ball such as a perforated wiffle ball. The ball is also rotatable about the longitudinal axis of the tether to further mimic actual ball flight dynamics. The device can be used for hitting, pitching and chipping practice.

Claims

1. Golf practice apparatus, comprising: a rigid post having a central, longitudinal axis and upper and lower ends defining a length; wherein the lower end of the post is connected to a fastener adapted for temporary attachment to a playing surface defining a ground plane such that the axis of the post is at an acute angle relative to the playing surface; a tether having proximal and distal ends defining a length; a ball fastened to the distal end of the tether; wherein the proximal end of the tether is coupled to the post in a manner enabling the ball to rotate in a plane around the post when the ball is struck by a golf club, and wherein the plane of rotation is at a non-zero angle relative to the ground plane; and a magnetic coupling causing the ball to come to rest in the same position on the playing surface following the rotation after the ball is struck.

2. The golf practice apparatus of claim 1, wherein the fastener adapted for temporary attachment to a playing surface is a spring clamp.

3. The golf practice apparatus of claim 1, wherein the ball is a hollow, plastic ball.

4. The golf practice apparatus of claim 1, wherein the ball is a hollow, plastic, perforated ball.

5. The golf practice apparatus of claim 1, wherein the tether is flexible and resilient.

6. The golf practice apparatus of claim 1, wherein the tether is a plastic cable tie.

7. The golf practice apparatus of claim 1, wherein the magnetic coupling comprises a single permanent magnet and a single magnetic element.

8. The golf practice apparatus of claim 7, wherein one of the magnet or the magnetic element is positioned on a non-magnetic member extending outwardly from the post, and the other of the magnet or magnetic element is fastened to the tether.

9. The golf practice apparatus of claim 8, wherein the non-magnetic member extending outwardly from the post is a disk through which the post extends.

10. The golf practice apparatus of claim 9, wherein the disk is a flexible disk enable the magnetic and magnetic element to make physical contact following the rotation after the ball is struck.

11. The golf practice apparatus of claim 1, wherein the ball is rotatable about the tether.

12. The golf practice apparatus of claim 1, wherein the distal end of the tether extends through the ball, with fasteners disposed on opposing surfaces of the ball.

13. The golf practice apparatus of claim 1, wherein the non-zero angle between the plane of rotation and the ground plane is in the range of 30 to 40 degrees.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of a preferred embodiment of the invention; and

(2) FIG. 2 is detailed drawing of the preferred embodiment illustrating component parts.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(3) Now making reference to the accompanying drawings, FIG. 1 is a perspective view that illustrates a preferred embodiment of the invention. In broad and general terms, before describing preferred components, the device includes a ball 102 coupled to a tether 104 enabling the ball and tether to spin around a post 106. In the preferred embodiment, shaft 106 is attached to a clamp 108 that may be affixed to a mat or other practice surface 110.

(4) A magnetic element (i.e., ferrous) 112 is coupled to the tether 104 proximate to the post 106, and a magnet 114 is disposed on an extension, preferably disk-shaped plate 116. In contrast to existing devices, ball 102 is preferably a lightweight perforated ball such as a wiffle ball, and tether 104 extends all the way through the ball to a component 105. The combination of a lighter-weight plastic perforated ball, and more secure tether, together facilitate indoor use while minimizing accidents.

(5) Ball 102 may also spin about the axis of tether 104, and the length of tether 104, shaft 106 and angle of the clamp 108 are selected so that the ball leaves the surface 110 at an angle when hit. The combination of spin and loft angle more faithfully simulate the type of ball dynamic experienced during actual play. Further, in terms of reduced cost, only one magnetic member and one magnet are required, and the upward polarity of magnet 114 may be N or S on disk 116. While having a magnetic element on the tether and magnetic 114 on a shaft extension is preferred, in an alternative embodiment, the magnet may be disposed on the tether with a magnetic element on a disk or other fixed extension.

(6) Having described the overall structure of the device, the reader's attention is now directed to FIG. 2, which provides further details with respect to a preferred construction. To begin, post 106 may use any suitable structural element. In the preferred embodiment a 3 10-24 steel bolt is used. While not shown, the exposed threads may be covered with a suitable plastic sleeve, shrink tubing, or the like. Bolt 106 is inserted through a hole drilled in one grip of spring clamp 108 with the head 134 of the bolt underneath the upper grip as shown. A nut 130 and lockwasher 132 may be used to secure the bolt 106 to the spring clamp 108.

(7) Spring clamp 108 may be a heavy duty muslin type steel clamp with rubber tips, having a width of 2 or more inches, preferably 4.5, and an opening greater than 1, preferably 2 or more. Disk 116 must be non-magnetic, so a neoprene fender washer may be used, having the dimensions 1 inches. Materials other than neoprene may be used, including aluminum, stainless steel, or nylon, though the latter may present issues associated with cementing magnet 114.

(8) A second nut 128 is threaded onto the bolt 106 to establish a surface for a series of components upper components. Disk 116 is fastened to pronged T-nut 126 using the prongs of the nut and optionally fortified with superglue. Item 124 is a bushing. Permanent magnet 114 is bonded to disk 116, also with superglue. The magnet 114 is may be a rare earth (i.e., neodymium) magnet having a 0.315 diameter and 0.115 thickness.

(9) Tether 104 is preferably a type 21 cable tie secured to a #10 nylon bushing. The other end of cable tie 104 is cut to length, threaded through ball 102, and secured at opposing ends of the ball with removable hitch or bent cotter pins 136. Items 138 are bushings. A cut length of 7, more or less, has been found to useful and reliable, though other lengths in the range of 5 to 12 may also be used. No. 10 pins may be used to secure Whiffle balls, or #8 pins may be used for other types of balls. The cable tie tether 104 is cut to length such that ball 102 rests on the surface 110 with the tie generally outstretched, as shown. In the preferred embodiment, the tether 104 is flexible or bendable yet resilient such that it remains in a generally straight condition (unless over-bent). The relative flexibility of tether 104 is important to the invention, as it allows the ball 102 to actually rest upon the surface 110 at the magnetically returned position. This is in contrast to prior-art devices that use a rigid arm, which never truly allow the ball to contact the playing mat or surface 110.

(10) A 3/16 nylon washer 122 is journaled over threaded post 106, followed by a cap nut 120, completing the assembly. Magnetic collar 112 may be implemented with a toothed lanyard clamp, crimped on cable tie tether 104 so as to be directly above magnetic 114. In the preferred embodiment, elements 112, 114 may actually make contact when the ball 102 comes to rest, which is advantageous compared to leaving gap which may cause ball to stop at slightly different positions between each swing. Indeed, the rubber washer disk 116 acts as a spring in allowing the magnet to attract the metallic contact 112 on the cable tie so that the struck ball returns to the same start position.

(11) Furthermore, the use of a spring clamp, in conjunction with a appropriately proportioned post and tether, provide a natural and desirable angle between the tether 104 and playing surface 110. Such an angle, preferably on the order of 20 to 45 degrees, more preferably in the range of 30 to 40 degrees. Most preferably, the ball and tether swing in a plane of about 35 degrees relative to ground, which simulates a launch angle of the type generally encountered when striking an actual golf ball during a drive, for example.