| 摘要 |
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.
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