Patent ID: 8622484

Claim:
A tool mount for use on a ground engaging machine, the tool mount comprising a tool, a tool holder, a retainer and a base, the base being adapted to be secured to a ground engaging machine adapted to rotate about its axis, the tool having an axis substantially perpendicular to the axis of the machine, the tool holder having an aperture therethrough for receiving a projecting shaft portion of the tool for mounting the tool and the tool holder having a shaped body portion adapted to interengage in a correspondingly shaped body portion of the base whereby the tool holder is movable in the direction of the tool axis but restrained from movement transverse to the tool axis by the base when installed, the tool holder having a portion for receiving the retainer, the retainer having a recess for receiving therein an end portion of the projecting shaft portion of the tool and the tool thereby being mounted to be rotatable around the tool axis but normally to be retained in engagement in the aperture and the recess, the retainer further having an inter-engagement structure for engaging with a complementary inter-engagement structure of the base and of the tool holder whereby the tool holder is restrained from movement along the tool axis upon installation of the retainer, the retainer, tool holder and base cooperating to define a recess defined between an axially facing end wall of the base and the end of the projection shaft of the tool whereby a pressure exerting element can be inserted into the recess between the end wall and the end of the projection shaft of the tool so that, upon activation of the pressure exerting element, the tool is axially displaced out of engagement with the retainer and the tool holder, whereby the tool may be replaced after a period of servicing when it is worn and thereby as necessary permitting a removal of the retainer and tool holder and their replacement if desired, and wherein the aperture in the tool holder has a circular cross-section and extends through a head of the tool holder for mounting the shaft of the tool, and a cradle shaped portion extending axially from the head for receiving the retainer, the tool holder having a T-shaped base with a reduced thickness portion being adjacent to the cradle portion, the T-shaped base being slidingly engagable in a corresponding recess in the base, the tool holder further comprising a recess in at least one upper edge portion of the cradle portion and the retainer has a corresponding lug to engage in the recess to prevent relative axial movement.