Hydraulic shear machine

Claim 2

A portable shear apparatus for metal pieces and the like comprising an upright frame including oppositely disposed side portions, an overhead portion and a wheel-mounted base portion, cutting means supported from said frame including a movable blade having a first cutting edge at an upper end and another cutting edge formed along a surface of an aperture in its body and a stationary blade cutting edge disposed in a plane parallel to each said movable blade, each stationary blade having a cutting edge in opposing and facing relation to associated of each said movable blade edges to provide an opening therebetween when the movable blade is disposed in a reTracted lower position, means for guiding said movable blade for reciprocal movement between said side portions inclusive of a pair of opposing rollers supported from the movable blade and oppositely disposed guide pieces on said side portions, a clamp including a stationary member supported from the overhead portion and a movable table member arranged for reciprocal movement between said side portions for holding the workpiece in position between said movable blade and its associated stationary blade, first hydraulic drive means for advancing said movable table member upwardly, second hydraulic drive means on the frame below said movable blade for advancing said movable blade upwardly to an extended position past the associated stationary blade edges for shearing a workpiece disposed in either of said openings, and control means for said drive means operative to successively actuate the clamp and the movable blade for successively clamping and shearing each workpiece.

Claim 3

Shear apparatus for workpieces comprising a mast, a cutting assembly supported from the mast including a movable blade supported for reciprocal movement between opposing sides of said mast and a stationary blade disposed in a plane parallel to each said movable blade, said blades having cutting edges disposed in opposing relation to provide an opening therebetween when the movable blade is disposed in a lower retracted position, clamp means supported on said mast including a stationary surface and an oppositely disposed movable surface supported for reciprocal movement between said sides of said mast for holding a workpiece in position between said blades, hydraulic cylinder means for advancing said movable surface upwardly to clamp a workpiece in position, hydraulic ram means advancing said blade upwardly to an extended position for shearing the clamped workpiece, a motor driven pump arranged for delivering fluid under pressure to said cylinder means and said ram means for actuating same, and a control system including a first manual valve means coupled between the output of said pump and the input of said cylinder means and a second manual valve means coupled between the output of said pump and the input of said ram means for selectively and independently controlling the upward movement of said clamp and blade, said control system including hydraulic booster means coupled between the pump and ram means and the input of said cylinder means to increase the pressure applied to said clamp.

Claim 4

Shear apparatus for workpieces comprising a mast, a cutting assembly supported from the mast including a movable blade supported for reciprocal movement between opposing sides of said mast and a stationary blade disposed in a plane parallel to each said movable blade, said blades having cutting edges disposed in opposing relation to provide an opening therebetween when the movable blade is disposed in a lower retracted position, clamp means supported on said mast including a stationary surface and an oppositely disposed movable surface supported for reciprocal movement between said sides of said mast for holding a workpiece in position between said blades, hydraulic cylinder means for advancing said movable surface upwardly to clamp a workpiece in position, hydraulic ram means advancing said blade upwardly to an extended position for shearing the clamped workpiece, a motor driven pump arranged for delivering fluid under pressure to said cylinder means and said ram means for actuating same, and a control system including a first manual valve means coupled between the output of said pump and the input of said cylinder means and a second manual valve means coupled between the output of said pump and the input of said ram means for selectively and independently controlling the upward movement of said clamp and blade, said control system including hydraulic booster means coupled between the pump and ram means and the input of said cylinder means to increase the pressure applied to said clamp.

Claim 5

Shear apparatus for workpieces comprising a mast, a cutting assembly supported from the mast including a movable blade supported for reciprocal movement between opposing sides of said mast and a stationary blade disposed in a plane parallel to said movable blade, each said blade having first and second associated cutting edges each disposed in opposing facing relation to one another to provide aligned openings therebetween when the movable blade is disposed in a lower retracted position, clamp means supported on said mast including a stationary surface and an oppositely disposed movable surface supported for reciprocal movement between said sides of said mast for holding a workpiece in position between said first associated cutting edges, hydraulic cylinder means disposed below the clamp for advancing said movable surface vertically upwardly to clamp a workpiece in position, hydraulic ram means disposed below the blade advancing said blade vertically upwardly to an extended position for shearing the clamped workpiece, a motor driven pump arranged for delivering fluid under pressure to said cylinder means and said ram means for actuating same, and a control system including a first manual valve means coupled between the output of said pump and the input of said cylinder means and a second manual valve means coupled between the output of said pump and the input of said ram means for selectively and independently controlling the upward movement of said clamp and blade, whereby the blade is movable independently of saiD clamp means for shearing a workpiece in the aligned opening between the second associated cutting edges.

Claim 6

Shear apparatus for workpieces comprising a mast, a cutting assembly supported from the mast including a movable blade supported for reciprocal movement between opposing sides of said mast and a stationary blade disposed in a plane parallel to said movable blade, each said blade having first and second associated cutting edges each disposed in opposing facing relation to one another to provide aligned openings therebetween when the movable blade is disposed in a lower retracted position, clamp means supported on said mast including a stationary surface and an oppositely disposed movable surface supported for reciprocal movement between said sides of said mast for holding a workpiece in position between said first associated cutting edges, hydraulic cylinder means disposed below the clamp for advancing said movable surface vertically upwardly to clamp a workpiece in position, hydraulic ram means disposed below the blade advancing said blade vertically upwardly to an extended position for shearing the clamped workpiece, a motor driven pump arranged for delivering fluid under pressure to said cylinder means and said ram means for actuating same, and a control system including a first manual valve means coupled between the output of said pump and the input of said cylinder means and a second manual valve means coupled between the output of said pump and the input of said ram means for selectively and independently controlling the upward movement of said clamp and blade, whereby the blade is movable independently of saiD clamp means for shearing a workpiece in the aligned opening between the second associated cutting edges.

Claim 7

Shear apparatus as set forth in claim 3 wherein said first movable cutting edge is inclined along the width and beveled along the thickness of the movable blade.

Claim 8

Shear apparatus as set forth in claim 3 wherein said second cutting edge is essentially of an inverted V-shaped configuration.

Claim 9

Shear apparatus as set forth in claim 3 wherein said stationary blade associated with said second cutting edge is an interchangeable die shaped to accommodate a workpiece of a preselected section.

Claim 10

Shear apparatus as set forth in claim 3, wherein said clamp movable member is returned to the lower retracted position by a spring bias means.

Claim 11

Shear apparatus as set forth in claim 3, wherein the movable clamp member is essentially planar and of substantial width along its upper surface for supporting a workpiece.

Claim 12

Shear apparatus as set forth in claim 3 wherein said clamp drive means for the clamp movable member is defined by a pair of simultaneously actuated spaced hydraulic cylinders arranged below the movable member for engaging an undersurface portion of the movable clamp member.

Claim 13

Shear apparatus as set forth in claim 3 wherein said control system includes hydraulic storage means coupled between the output of said pump and said first manual valve means to provide pressure to said first valve means to advance said cylinder means independently of the operation of said motor driven pump.