Bulldozer blade push arms

Claim 2

A frame, comprising: (a) a first, elongated C-shaped plate having a first base and first and second legs, (b) a second, elongated C-shaped plate having a second base and third and fourth legs, said first and second legs overlapping said third and fourth legs, respectively, wherein one leg of only one pair of said first and third legs or said second and fourth legs has a chamfer to form a wedge fit between said legs of said one pair; and (c) a weld joining said first and third legs and said second and fourth legs where said legs overlap.

Claim 3

A frame according to claim 1 wherein said weld is a fillet weld.

Claim 4

A frame according to claim 1 wherein said first plate defines a lower channel with said first and second legs extending upwardly from said first base, and said second plate defines an upper channel with said third and fourth legs extending downwardly from said second base.

Claim 5

A frame according to claim 3 wherein said third leg has said chamfer at the overlap and said first leg contacts said chamfer to form said wedge fit between said first and third legs.

Claim 6

A frame according to claim 3 further comprising a bracket having fifth and sixth legs straddling, respectively, the outsides of said third and fourth legs and welded, respectively, on top ends of said first and second legs and to said third and fourth legs.

Claim 7

A push arm assembly for connecting a bulldozer blade to a tractor, comprising: (a) a first, elongated C-shaped plate defining a lower channel, including a first, horizontally extending base and first and second legs extending upwardly from said first base; (b) a second, elongated C-shaped plate defining an upper channel, including a second, horizontally extending base and third and fourth legs extending downwardly from said second base, said first and second legs overlapping, respectively, said third and fourth legs, wherein one leg of only one pair of said first and third legs or said second and fourth legs has a chamfer to form a wedge fit between said legs of said one pair; and (c) a first weld joining said first and third legs and said second and fourth legs where said legs overlap.

Claim 8

A push arm assembly for connecting a bulldozer blade to a tractor, comprising: (a) a first, elongated C-shaped plate defining a lower channel, including a first, horizontally extending base and first and second legs extending upwardly from said first base; (b) a second, elongated C-shaped plate defining an upper channel, including a second, horizontally extending base and third and fourth legs extending downwardly from said second base, said first and second legs overlapping, respectively, said third and fourth legs, wherein one leg of only one pair of said first and third legs or said second and fourth legs has a chamfer to form a wedge fit between said legs of said one pair; and (c) a first weld joining said first and third legs and said second and fourth legs where said legs overlap.

Claim 9

A push arm assembly according to claim 6 wherein said first leg overlaps the outside of said third leg and said second leg overlaps the outside of said fourth leg.

Claim 10

a push arm assembly according to claim 6 further comprising a bracket means for coupling a brace to said blade and said assembly, said bracket means including fifth and sixth legs straddling, respectively, the outsides of said third and fourth legs and connected, respectively, to said first and second legs.

Claim 11

A push arm assembly according to claim 8 wherein said fifth and sixth legs are connected to said first and second legs by a second weld.

Claim 12

A push arm assembly according to claim 9 wherein said first and second welds are contiguous.

Claim 13

A push arm assembly according to claim 6 wherein said first weld is a fillet weld.

Claim 14

A push arm assembly according to claim 6 wherein said third leg has said chamfer, and said first leg contacts said third leg at said chamfer to provide said wedge fit.

Claim 15

A frame comprising: (a) a first elongated C-shaped plate defining a lower channel and having a first base and first and second legs extending upwardly from said first base, said first and second legs having top ends; (b) a second, elongated C-shaped plate defining an upper channel and having a second base and third and fourth legs extending downwardly from said second base, said third and fourth legs overlapping inner sides of said top ends of said first and second legs; and (c) bracket means for supporting a member, including fifth and sixth legs straddling, respectively, the outsides of said third and fourth legs and welded, respectively, on said top ends of said first and second legs and to said third and fourth legs.

Claim 16

A frame comprising: (a) a first elongated C-shaped plate defining a lower channel and having a first base and first and second legs extending upwardly from said first base, said first and second legs having top ends; (b) a second, elongated C-shaped plate defining an upper channel and having a second base and third and fourth legs extending downwardly from said second base, said third and fourth legs overlapping inner sides of said top ends of said first and second legs; and (c) bracket means for supporting a member, including fifth and sixth legs straddling, respectively, the outsides of said third and fourth legs and welded, respectively, on said top ends of said first and second legs and to said third and fourth legs.

Claim 17

A push arm assembly for connecting a bulldozer blade to a tractor, comprising: (a) a first, elongated C-shaped plate defining a lower channel and having a first, horizontally extending base and first and second legs extending upwardly from said first base, said first and second legs having top ends; (b) a second, elongated C-shaped plate defining an upper channel and having a second, horizontally extending base and third and fourth legs extending downwardly from said second base, said third and fourth legs overlapping inner sides of said top ends of said first and second legs; and (c) bracket means for coupling a brace to the blade and to said first and second legs, including fifth and sixth legs straddling, respectively, the outsides of said third and fourth legs and welded, respectively, on said top ends of said first and second legs and to said third and fourth legs.

Claim 18

A push arm assembly for connecting a bulldozer blade to a tractor, comprising: (a) a first, elongated C-shaped plate defining a lower channel and having a first, horizontally extending base and first and second legs extending upwardly from said first base, said first and second legs having top ends; (b) a second, elongated C-shaped plate defining an upper channel and having a second, horizontally extending base and third and fourth legs extending downwardly from said second base, said third and fourth legs overlapping inner sides of said top ends of said first and second legs; and (c) bracket means for coupling a brace to the blade and to said first and second legs, including fifth and sixth legs straddling, respectively, the outsides of said third and fourth legs and welded, respectively, on said top ends of said first and second legs and to said third and fourth legs.