Replaceable Demolition Shear Piercing Tip

Abstract

A heavy-duty demolition shear with a replaceable shearing tip has a lower jaw and an upper jaw pivotally connected to the lower jaw. The upper jaw has primary and secondary shear blades. A replaceable shearing tip is mounted to the upper jaw. The replaceable shearing tip has two L-shaped sections which engage the upper jaw between them. The replaceable shearing tip engages the upper jaw on at least three seats. The replaceable shearing tip is connected to the upper jaw by socket-head cap-screws.

1 - 23 . (canceled) 
     
     
         24 . A piercing tip for a shear, comprising:
 (a) a first tip half adapted to mount to a first mounting surface of a shear, the first mounting surface defined by a recessed area bounded by a top seat and a rear seat and a bottom seat, the first tip half having a cutting edge defined by an intersection of a substantially planar  1  sidewall and a bottom wall extending substantially perpendicular to the substantially planar sidewall;   (b) a second tip half adapted to mount to a second mounting surface, the first mounting surface defined by a recessed area bounded by a top seat and a rear seat and a bottom seat, the second tip half having a cutting edge defined by an intersection of a substantially planar sidewall and a bottom wall extending substantially perpendicular to said substantially planar sidewall;   whereby when the first tip half is mounted to the first mounting surface, a top edge of the first tip half abuts the top seat of the first mounting surface, and a rear edge of the of the first tip abuts the rear seat of the first mounting surface, and an edge of the bottom wall abuts the bottom seat of the first mounting surface; and   whereby when the second tip half is mounted to the second mounting surface, a top edge of the second tip half abuts the top seat of the second mounting surface, and a rear edge of the of the second tip abuts the rear seat of the second mounting surface, and an edge of the bottom wall abuts the bottom seat of the second mounting surface; and   whereby when the first and second tip halves are mounted to the first and second mounting surfaces, the substantially planar sidewalls of the first and second halves are opposed to each other and the bottom walls of the first and second tip halves abut one another.   
     
     
         25 . A piercing tip for a shear, comprising:
 a first piercing tip half, comprising:
 (a) a sidewall having:
 (i) a planar outer surface; 
 (ii) an inner bearing surface; 
 (iii) a substantially uniform thickness defined by a distance between the planar outer surface and the inner bearing surface; 
 (iv) a front surface; 
 (v) a rear bearing surface; and 
 (vi) a top bearing surface; 
 
 (b) a bottom flange extending substantially perpendicular to the sidewall, the bottom flange having:
 (i) a bottom surface; 
 (ii) an upper bearing surface; 
 (iii) a flange thickness defined by a distance between the bottom surface and the upper bearing surface; 
 (iv) a front surface; and 
 (v) a rear bearing surface; 
 
 (c) a shearing edge defined by an intersection of the planar outer surface of the sidewall and the bottom surface of the bottom flange; 
 (d) an inner corner defined by an intersection of the inner bearing surface of the sidewall and the upper bearing surface of the bottom flange; 
 (e) a piercing edge defined by the intersection of the bottom surface of the bottom flange and the front surfaces of the sidewall and the bottom flange; 
 (f) a rear bottom corner defined by the intersection of the rear bearing surface of the sidewall and the bottom surface of the bottom flange; 
 (g) a front upper corner defined by the intersection of the front surface of the sidewall and the top bearing surface of the sidewall; 
 (h) a rear upper corner defined by the intersection of the rear bearing surface and the top bearing surface, the rear upper corner having a radius. 
   
     
     
         26 . The piercing tip of  claim 25 , wherein the bottom surface of the bottom flange and the upper bearing surface of the bottom flange form an angle (α4) between about −15° to +15°. 
     
     
         27 . The piercing tip of  claim 25 , further comprising:
 a second piercing tip half, wherein the second piercing tip half is substantially a mirror image of the first piercing tip half.   
     
     
         28 . The piercing tip of  claim 27 , wherein the bottom surface of the bottom flange and the upper bearing surface of the bottom flange of both the first piercing tip half and second piercing tip half form an angle (α4) between about −15° to +15°. 
     
     
         29 . A blade set for a shear, comprising:
 (a) a shear blade having:
 (i) a planar outer surface; 
 (ii) an inner bearing surface; 
 (iii) a thickness defined by a distance between the planar outer surface and inner bearing surface; 
 (iv) a front bearing end; 
 (v) a top surface; 
 (vi) a bottom surface; 
 (vii) a shearing edge defined by an intersection of the planar outer surface and the bottom surface; 
 (viii) a lower front corner defined by an intersection of the front bearing end and the bottom surface; and 
   (b) a first piercing tip half, comprising:
 (i) a sidewall having:
 (A) a planar outer surface; 
 (B) an inner bearing surface; 
 (C) a substantially uniform thickness defined by a distance between the planar outer surface and the inner bearing surface; 
 (D) a front surface; 
 (E) a rear bearing surface; and 
 (F) a top bearing surface; 
 
 (ii) a bottom flange extending substantially perpendicular to the sidewall, the bottom flange having:
 (A) a bottom surface; 
 (B) an upper bearing surface; 
 (C) a flange thickness defined by a distance between the bottom surface and the upper bearing surface; 
 (D) a front surface; and 
 (E) a rear bearing surface; 
 
 (iii) a shearing edge defined by an intersection of the planar outer surface of the sidewall and the bottom surface of the bottom flange; 
 (iv) an inner corner defined by an intersection of the inner bearing surface of the sidewall and the upper bearing surface of the bottom flange; 
 (v) a piercing edge defined by the intersection of the bottom surface of the bottom flange and the front surfaces of the sidewall and the bottom flange; 
 (vi) a rear bottom corner defined by the intersection of the rear bearing surface of the sidewall and the bottom surface of the bottom flange; 
 (vii) a front upper corner defined by the intersection of the front surface of the sidewall and the top bearing surface of the sidewall; 
 (viii) a rear upper corner defined by the intersection of the rear bearing surface and the top bearing surface, the rear upper corner having a radius. 
   whereby, the thicknesses of the shear blade and the sidewall of the first piercing tip half are substantially the same;   whereby, the front lower corner of the shear blade and the rear bottom corner of the first piercing tip half are configured to matingly align and the front bearing end of the shear blade and the rear bearing surface of the sidewall of the first piercing tip half are configured to bear against one another.   
     
     
         29 . The blade set of  claim 29 , wherein, when the front lower corner of the shear blade and the rear bottom corner of the first piercing tip half are matingly aligned and the front bearing end of the shear blade and the rear bearing surface of the sidewall of the first piercing tip half are bearing against one another, the bottom surface of the bottom flange and the bottom surface of the shear blade form an angle (α1) between about −10° to +35°. 
     
     
         30 . The blade set of  claim 29 , wherein, when the front lower corner of the shear blade and the rear bottom corner of the first piercing tip half are matingly aligned and the front bearing end of the shear blade and the rear bearing surface of the sidewall of the first piercing tip half are bearing against one another, the top bearing surface of the sidewall of the piercing tip and the upper bearing surface of the shear blade form an angle (α2) between about −20° to +25°. 
     
     
         31 . The blade set of  claim 29 , wherein, when the front lower corner of the shear blade and the rear bottom corner of the first piercing tip half are matingly aligned and the front bearing end of the shear blade and the rear bearing surface of the sidewall of the first piercing tip half are bearing against one another, the upper bearing surface of the sidewall and the front surface of the sidewall of the piercing tip form an angle (α3) between about 55° to 75°. 
     
     
         32 . The blade set of  claim 29 , wherein the bottom surface of the bottom flange and the upper bearing surface of the bottom flange of the first piercing tip half form an angle (α4) between about −15° to +15°. 
     
     
         33 . The blade set of  claim 29  further comprising:
 (c) a second piercing tip half, wherein the second piercing tip half is substantially a mirror image of the first piercing tip half. 
 
     
     
         34 . The blade set of  claim 33 , wherein the bottom surface of the bottom flange and the upper bearing surface of the bottom flange of both the first and second piercing tip halves form an angle (α4) between about −15° to +15°.