Reconstructible karate board

Details Reconstructible karate board Reconstructible karate board

1975-04-07

1977-01-25

Pinkham, Richard C.

Undertaking

272 76, 46 31, A63J 500

Patent

active

040047997

ABSTRACT:
A karate board includes a pair of pine board members equal in size to one-half of the karate board. A releasable edge connection includes similar channels firmly affixed to the joinder edge of each board. Each of the channels includes a connecting slot having a reduced neck portion. The abutting channel faces are planar with the reduced neck portions in alignment and a key extends through the adjacent neck portions with inner enlargements which firmly interlock the board members together. The channel members and the key member are formed of plastic which is slightly flexible and of a low friction coefficient. The outer edges of the abutting channel faces are rounded. The neck portions are circular with the axis in the abutting faces and the enlargements of the key are also circular to provide rolling surfaces. A conventional karate force applied to the assembled board members separates the key member moving from one of the channel slots with a snap-action essentially the same as breaking of a pine board and without damage to the board or to the key connection means thereby producing a readily reconstructible karate board. A plurality of different keys with different cross sections establish different holding forces associated with the various levels of karate.

REFERENCES:
patent: 2582553 (1952-01-01), McMurtrie
patent: 2714269 (1955-08-01), Charles
patent: 2735146 (1956-02-01), Purviance
patent: 3076286 (1963-02-01), Czecholinski
patent: 3883135 (1975-05-01), Milliken

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