Abstract: A quick hitch coupler for coupling an attachment to a dipper arm of an excavator, the quick hitch coupler comprising: (a) a body member adapted for coupling to the dipper arm, (b) a fixed engaging jaw mounted on the body member for engaging a first one of a pair of coupling pins mounted on the attachment, (c) a movable engaging jaw mounted on the body member for engaging a second one of the pair of coupling pins of the attachment, the movable engaging jaw being movable between an engaged state with the movable engaging jaw engaging the second coupling pin while the fixed engaging jaw engages the first coupling pin for coupling the attachment to the coupler, and a disengaged state for disengaging the second coupling pin, (d) a latch co-operable with the fixed engaging jaw for retaining the first coupling pin of the attachment engaged in the fixed engaging jaw the latch being alternately operable in a latched state co-operating with the fixed engaging jaw for retaining the first coupling pin in the fixed eng

Abstract: A quick hitch coupler for coupling an attachment to a dipper arm of an excavator, the quick hitch coupler comprising: (a) a body member adapted for coupling to the dipper arm, (b) a fixed engaging jaw mounted on the body member for engaging a first one of a pair of coupling pins mounted on the attachment, (c) a movable engaging jaw mounted on the body member for engaging a second one of the pair of coupling pins of the attachment, the movable engaging jaw being movable between an engaged state with the movable engaging jaw engaging the second coupling pin while the fixed engaging jaw engages the first coupling pin for coupling the attachment to the coupler, and a disengaged state for disengaging the second coupling pin, (d) a latch co-operable with the fixed engaging jaw for retaining the first coupling pin of the attachment engaged in the fixed engaging jaw the latch being alternately operable in a latched state co-operating with the fixed engaging jaw for retaining the first coupling pin in the fixed eng

Abstract: An excavator tool attaching mechanism includes a housing having a pair of housing walls; a fixed engagement member for engaging with a first coupling pin of an excavator tool; a moveable engagement mechanism for engaging with a second coupling pin of the excavator tool; and a safety mechanism moveable between a locked and an unlocked configuration. The moveable engagement mechanism includes an engaging element moveable between a first position for releasing the excavator tool and a second position for engagement with the second coupling pin. The safety mechanism is automatically moved from the unlocked to the locked configuration by movement of the engaging element from the first to the second position, preventing movement of the engaging element between the second and first position. The engaging element is moveable to the second position when the moveable engagement mechanism engages with the second coupling pin.

Abstract: An excavator tool attaching mechanism comprising a housing comprising a pair of housing walls; a first fixed engaging means for engaging with a first retaining element of an excavator tool; a second moveable engaging means for engaging with a second retaining element of the excavator tool; a safety mechanism moveable between a locked and an unlocked configuration; wherein the second moveable engaging means comprises an engaging element moveable between a first position for releasing an excavator tool and a second position for engagement with the second retaining element, wherein the safety mechanism is automatically moved from the unlocked to the locked configuration by movement of the engaging element from the first to the second position, preventing movement of the engaging element between the second and first position; and wherein the engaging element is moveable to the second position when the second moveable engaging means engages with the second retaining element.

Abstract: The invention provides combretastatin A-4 like compounds that are modified to have enhanced tubulin binding activity and in some embodiments the ability to promote accumulation in the vasculature undergoing angiogenesis (homing activity). The compounds are based on the combretastatin A-4 skeletal structure having a tubulin-binding pharmacophore comprising two fused rings (A and B rings) in which the B ring is substituted with (a) an aromatic ring structure (C ring) and (b) a second substituent/functional group that comes off the B ring. The aromatic ring structure is typically a six membered ring phenolic or aniline structure, or may also be a fused ring structure such as a substituted or unsubstituted naphthalene.