Arrangement for fastening an upstanding post to a floorboard

An arrangement for fastening an upstanding post in a floor board for use in indoor sports comprising:

• a. a hollow cylindrical support, being provided with an opening in the circumferential wall thereof for receiving a loosely fitted post, said support being defined by a ring-shaped flange at an upper end thereof and having a truncated conically shaped projection at the bottom thereof, said support being embedded in a concrete block positioned below the floorboard at a predetermined depth,
• b. a guide box, having a support plate therein, disposed on the outer circumferential wall of said cylindrical support for covering the opening in said cylindrical support,
• c. a headed screw rod being rotatably supported below the head thereof by said flange whereby said head appears above said guide box, and being rotatably supported at the lower end thereof by said support plate disposed within said guide box,
• d. a first wedge member, having a tapered surface at one side thereof, a screw for threadedly receiving said screw rod for upward and downward movement, said first wedge member being prevented from rotation about an axis of said screw rod by said guide box,
• e. a second wedge member, having a tapered surface facing said tapered surface of said first wedge member received in the opening of said circumferential wall of said support being movable in the radial direction of said support in accordance with movement of said first wedge member,
• f. step means provided at the top end of said second wedge member, said second wedge member being disposed to be stopped by the edge of said opening in said support when said second wedge member moves in a radial direction of said support to firmly press the outer circumferential surface of said post, said second wedge being further provided with a tapered surface in proximity to said step, and
• g. a hole provided through the floorboard being in vertical alignment with said screw rod, whereby as means for turning said screw rod at the driving end thereof are inserted through said hole said driving end being positionable in said head of said screw rod for rotation, said first wedge member being movable in an upward and downward direction in response to rotation of said screw rod, said second wedge member being in turn movable in radial direction of said support to securely fasten the outer circumferential surface of said port in said support.