| 摘要 |
An insert is provided for varying the inside diameter of a hole in a device such as a bowling ball. The insert has a coaxial pair of telescoped tubes permanently joined together and a ramp section that is mounted at its base to a ring member. The ramp and ring are located between the telescoped tubes and can be rotated relative to the telescoped tubes. The inner telescoped tube is constructed of a flexible material, and its outside shell has a boss that separates two recesses. The ramp section decreases in thickness across its width. The cylindrical ring member terminates at its base in a slot. Upon inserting a driver into the slot means and turning, the cylindrical ring member and ramp section rotate relative to the stationary telescoped tubes. When the hole is at its maximum diameter, the ramp section rotates, with its thinner end first, onto the boss, thereby depressing a portion of the inner tube and constricting the diameter of the hole. Since the ramp section has variable thickness, the extent of constriction of the hole varies with the degree of rotation of the slot. A cap fixed to the outer tube has a serrated edge for engaging the serrated edge of the cylindrical ring member, thereby locking the insert to a desired degree of constriction.
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