Patent ID: 8628035

Claim:
A blade set associated with jaws for demolition equipment, wherein at least one jaw rotates relative to the other jaw about a rotational axis within a common rotational plane, the blade set comprising: a) a bottom blade adapted to be secured to the bottom jaw, wherein the bottom blade has: 1) a first radial axis therethrough and within the rotational plane; 2) two opposing raised support rails, each having: i) planar surface segments generally perpendicular to the rotational plane and extending parallel to the first radial axis along a length; ii) recesses between the planar surface segments along a length, wherein the recesses extend across the width of the support rail and the recesses of one support rail are aligned with corresponding recesses of the other opposing support rail; 3) a cavity extending between and adjacent to the support rails; b) a top blade adapted to be secured to the top jaw, wherein the top blade has: 1) a second radial axis therethrough and within the rotational plane; 2) a raised knife rail having: i) planar surface segments generally perpendicular to the rotational plane and extending parallel to the second radial axis along a length; ii) recesses between the planar surface segments along a length, wherein the recesses extend across the width of the knife rail; iii) wherein the width of the knife rail at the planar surface segments is less than the width at the opening of the cavity; c) wherein the top blade and the bottom blade are symmetric about the rotational plane; d) wherein the ratio of the length of each recess to the planar surface segment length is between 1.0-3.0; e) wherein when viewed from the side, the recesses in the top blade and in the bottom blade have two sides extending about a recess centerline and extending away from adjacent planar surface segments, wherein the two sides come together and intersect at a radiused segment therebetween; f) wherein the sides of the recesses form an angle A with the central axis of at least 20 degrees; and g) wherein the raised knife rail closes into the cavity.