Replaceable blade combination for chisel blade

Claim 2

In a horizontal land chisel tool, in combination, a rigid frog foot secured to and carried by an arm of a tool carrier frame, the foot having a bolt opening herein, and a replaceable chisel blade unit adapted to be removably secured to and carried by said frog foot and comprising: matrix yoke adapter clamp unit having upper and lower overlapping substantially parallel legs each having two parallel edges and with the edges of each leg being parallel with the edges of the other leg and with each leg having a companion aligned opening adapted to receive a bolt extending therethrough both legs, one of said pair of adjacent parallel edges of the upper and lower legs of the adapter clamp being spring-hinge-spot-welded together at a plurality of spaced spots, a bolt securing means extending through said bolt openings and adapted to removably secure the adapter clamp to the frog foot, and a removable cutter blade having a reduced wedge neck portion removably positioned between and clampingly held by the other parallel pair of edges of the legs of the yoke adapter clamp opposite from said spring-hinge-spots upon securement of the adapter legs to the frog foot by the bolt securing means, and said spring tension hinges normally holding said legs with said other parallel pair of edges Spaced apart.

Claim 3

A land chisel tool combination as defined in claim 1, and further characterized by the cutter blade wedge-neck portion being cross-sectionally wedge shaped with its thicker cross-sectional wedge dimension being outermost, and with the upper leg of the adapter clamp having one edge formed as a protruding cornice adapted cross-sectionally to receive said wedge shape neck portion of the cutter blade for snug abuttment holding of that leg wedge neck portion thereby and against the other leg on that wedge shape portion of the blade being inserted between said legs and on securement of the bolt securement means.

Claim 4

A land chisel tool combination comprising: a rigid frog foot secured to and carried by an arm of a tool carrier frame, said frog foot having a forwardly downwardly acute angle surface with relation to the ground surface and having a bolt opening therein, and a replaceable chisel blade unit adapted to be removably secured to and carried by said frog foot and comprising: a matrix yoke adapter clamp unit having upper and lower overlapping substantially parallel legs each having two parallel edges and with the edges of each leg being parallel with corresponding edges of the other leg and with each leg having a companion aligned bolt opening extending therethrough, one edge of the upper leg being disposed in a substantially common plane with the corresponding edge of the lower leg, the upper leg having a plurality of spaced fingers each secured to the one edge thereof so as to extend at substantially a right angle thereto, said fingers extending downwardly over said corresponding edge of the lower leg so as to act as gravity finger hinges for hingedly holding the upper leg on the lower leg when the legs are overlapped loosely on the frog foot with said fingers uppermost, a bolt securing means extending through said bolt openings and adapted to removably secure the adapter clamp to the frog foot, and a cutter blade having a wedge neck portion edge removably held by the parallel edges of the legs opposite from said gravity finger hinges.

Claim 5

A land chisel tool combination comprising: a rigid frog foot secured to and carried by an arm of a tool carrier frame, said frog foot having a forwardly downwardly acute angle surface with relation to the ground surface and having a bolt opening therein, and a replaceable chisel blade unit adapted to be removably secured to and carried by said frog foot and comprising: a matrix yoke adapter clamp unit having upper and lower overlapping substantially parallel legs each having two parallel edges and with the edges of each leg being parallel with corresponding edges of the other leg and with each leg having a companion aligned bolt opening extending therethrough, one edge of the upper leg being disposed in a substantially common plane with the corresponding edge of the lower leg, the upper leg having a plurality of spaced fingers each secured to the one edge thereof so as to extend at substantially a right angle thereto, said fingers extending downwardly over said corresponding edge of the lower leg so as to act as gravity finger hinges for hingedly holding the upper leg on the lower leg when the legs are overlapped loosely on the frog foot with said fingers uppermost, a bolt securing means extending through said bolt openings and adapted to removably secure the adapter clamp to the frog foot, and a cutter blade having a wedge neck portion edge removably held by the parallel edges of the legs opposite from said gravity finger hinges.

Claim 6

In a horizontal dirt chisel tool, in combination, a rigid carrier arm secured to and carried by the underside of a tool carrier frame, a rigid frog foot base member having a bolt opening therethrough and secured to and carried by said arm, and a horizontal replaceable chisel blade unit removably secured to and carried by said frog foot base and comprising: a matrix yoke member having overlapping arms joined at one end by a plurality of spaced spot welds which serve as spring-tensioned hinges for normally urging said arms into spaced apart relation, each of said arms having an aligned bolt opening, a bolt-securing means extending through said arm openings and through the openings of the frog foot base for thereby removably securing the yoke to the frog base by thereby compressing the arms together against the spring tension of the yoke member, and a removable earth cutter blade having a portion thereof inserted between and clampingly held by the arms of the spot-welded-tensioned yoke member before and upon securement, respectively, of the yoke to the frog base member by the bolt-securing means, whereby upon release of the holt-securing means the spring tension of the spot-welded yoke member causes its arms to become spaced apart for thereby automatically releasing the cutter blade portion from between the yoke arms.

Claim 7

In a horizontal dirt chisel tool, in combination, a rigid carrier arm secured to and carried by the underside of a tool carrier frame, a rigid frog foot base member having a bolt opening therethrough and secured to and carried by said arm, and a horizontal replaceable chisel blade unit removably secured to and carried by said frog foot base and comprising: a matrix yoke member having overlapping arms joined at one end by a plurality of spaced spot welds which serve as spring-tensioned hinges for normally urging said arms into spaced apart relation, each of said arms having an aligned bolt opening, a bolt-securing means extending through said arm openings and through the openings of the frog foot base for thereby removably securing the yoke to the frog base by thereby compressing the arms together against the spring tension of the yoke member, and a removable earth cutter blade having a portion thereof inserted between and clampingly held by the arms of the spot-welded-tensioned yoke member before and upon securement, respectively, of the yoke to the frog base member by the bolt-securing means, whereby upon release of the holt-securing means the spring tension of the spot-welded yoke member causes its arms to become spaced apart for thereby automatically releasing the cutter blade portion from between the yoke arms.