PRACTICE GOLF CLUB

• US 3,677,553 A
• Filed: 09/14/1970
• Issued: 07/18/1972
• Est. Priority Date: 10/03/1969
• Status: Expired due to Term

• Current Assignee: Eric Desmond Moore
• Original Assignee: Eric Desmond Moore
• Inventors: Moore, Eric Desmond
• Primary Examiner(s): Marlo, George J.
• Application Number:
  US05/071,957
• Time in Patent Office: 673 Days
• Field of Search: 273/186,193,194,183,26
• US Class Current: 473/220
• CPC Class Codes: A63B 15/00 Clubs for gymnastics or the like , e.g. for swinging exercises
• CPC Class Codes: A63B 2024/0068 Comparison to target or threshold, previous performance or not real time comparison to other individuals
• CPC Class Codes: A63B 2220/51 Force
• CPC Class Codes: A63B 2225/74 with powered illuminating means, e.g. lights
• CPC Class Codes: A63B 69/3614 using electro-magnetic, magnetic or ultrasonic radiation emitted, reflected or interrupted by the golf club

Abstract

The invention consists in providing in the shaft of a golf club a spring supported weight, preferably a dry battery, which is slidable in said shaft under the action of centrifugal force and against the action of said spring attached thereto to cause said weight to engage an electric contact in the circuit of a lamp bulb mounted in the club head to cause said lamp to light up during the swinging of said club. The spring to which the battery is attached is carried by a rod which may be axially adjusted within a guide sleeve in the shaft of the club by rotating an adjusting knob mounted on the end of said shaft by means of a friction plug and fixed to a screw connected to axially displace said rod when said knob is rotated. The electrical contact is mounted on an insulating plug in said shaft at a point spaced from the battery.

Claims

1. A practice golf club comprising a hollow shaft, a club head fixed to one end of said shaft, an axially adjustable member within said shaft, a dry electrical battery housed in said shaft and axially slidable therein, a helical spring attached at one end to said battery and at the other end to said adjustable member, so that when centrifugal force is applied to said battery by swinging of said club said sliding movement of said battery away from said adjustable member is resisted by said spring, an electrical circuit in said club containing a light bulb mounted in said club head, a contact in said circuit positioned to be engaged by said battery to close said circuit when said battery is moved away from said adjustable member, and means accessible from the end of said shaft remote from said head for adjusting the position of said adjustable member.

2. A practice golf club according to claim 1, wherein said axially adjustable member is slidably mounted in a guide sleeve and said means for adjusting the position of said adjustable member comprises a screw screwed intO said adjustable member and rotatable by an adjusting knob at the outer end of the handle portion of the shaft of the club, means for preventing axial movement of said screw and means for preventing relative rotation between said adjustable member and said guide sleeve.

3. A practice golf club according to claim 2, wherein said guide sleeve is screwed onto a shank portion of a head member to which is attached a flexible plug member fitted frictionally into the outer end of the handle portion of the shaft of the club, said screw passing coaxially through said shank portion.

4. A practice golf club according to claim 1, wherein said spring is housed in an elongated tubular member which at one of its ends abuts said axially adjustable member and at its other end abuts a holder for holding said dry battery.

5. A practice golf club according to claim 4, wherein said contact is mounted in an insulating plug fitted into a sleeve positioned in the shaft of the club adjacent to the club head.