Front mounting for rotary type mower

Claim 1

A SELF-SUPPORTING ROTARY LAWN MOWING ATTACHMENT COMPRISING, IN COMBINATION, (A) A HOUSING, (B) AT LEAST ONE VERTICALLY DISPOSED SHAFT MOUNTED ON SAID HOUSING HAVING A BLADE ATTACHMENT END LOCATED WITHIN SAID HOUSING, (C) A BLADE ATTACHED TO SAID BLADE ATTACHMENT END OF SAID SHAFT, (D) A BRACKET MOUNTED UPON SAID HOUSING, (E) A VERTICALLY DISPOSED CYLINDRICAL BORE DEFINED IN SAID BRACKET, (F) A CYLINDRICAL SHAFT RECEIVED WITHIN SAID BORE AND AXIALLY ADJUSTABLE THEREIN, (G) A GROUND WHEEL ROTATABLE SUPORTED ON SAID CYLINDRICAL SHAFT, (H) A PLURALITY OF AXIALLY SPACED CIRCUMFERENTIAL GROOVES DEFINED ON SAID CYLINDRICAL SHAFT, SAID GROOVES EACH INCLUDING AN ABUTMENT SHOULDER, (I) A LOCKING MEMBER MOUNTED ON SAID BRACKET INCLUDING A CYLINDRICAL SHAFT ENGAGING PORTION RESTRAINED AGAINST VERTICAL UPWARD MOVEMENT RELATIVE TO SAID BRACKET, (J) A SHAFT RECEIVING OPENING DEFINED IN SAID LOCKING MEMBER SHAFT ENGAGING PORTION, SAID OPENING INCLUDING A FIRST PORTION OF A LARGER DIAMETRICAL DIMENSION THAN SAID SHAFT AND A SECOND PORTION INCLUDING OPPOSED SPACED EDGES ADAPTED TO BE CLOSELY RECEIVED WITHIN A SHAFT GROOVE UPON A GROOVE BEING ALIGNED WITH SAID SHAFT ENGAGING PORTION TO RESTRICT AXIAL MOVEMENT OF SAID CYLINDRICAL SHAFT WITHIN SAID BRACKET WHILE PERMITTING ROTATION OF SAID SHAFT THEREIN, AND (K) BIASING MEANS BIASING SAID LOCKING MEMBER SHAFT ENGAGING PORTION IN A DIRECTION MAINTAINING SAID OPENING SECOND PORTION IN ENGAGEMENT WITH AN ALIGNED SHAFT GROOVE.