Post hole digger
View Patent ↗This invention provides a post hole digger having a first, traverse pivot point, located on the medial portions of two handle members, and a second, blade assembly pivot point located at the medial point of the blade assemblies. Because the first pivot point is a traverse pivot point, the handle members are only required to travel through a limited range of motion. Additionally, the second, blade assembly pivot point is preferably an offset pivot point. Thus, because the second, blade assembly pivot point is disposed at a medial point of the blade assemblies, the motion of the handle members, which are coupled to the upper ends of the blade assemblies, is reversed relative to the lower ends of the blade members.
1. A post hole digger comprising:
a first handle assembly having an upper end, a medial portion, and a lower end;
a second handle assembly having an upper end, a medial portion, and a lower end;
said first handle assembly pivotally coupled to said second handle assembly at a first, traverse pivot point, said first, traverse pivot point disposed on said first handle assembly medial portion and said second handle assembly medial portion;
a blade assembly having a first blade sub-assembly and a second blade sub-assembly;
said first blade sub-assembly pivotally coupled to said first handle assembly, said first blade sub-assembly having an elongated blade member having an upper end and a lower end;
said second blade sub-assembly pivotally coupled to said second handle assembly, said second blade sub-assembly having an elongated blade member having an upper end and a lower end;
said first blade sub-assembly and said second blade sub-assembly coupled together at a blade assembly pivot point, said blade assembly pivot point disposed on said first blade sub-assembly blade member upper end and said second blade sub-assembly blade member upper end;
a central longitudinal axis extending through said traverse, first pivot point and said blade assembly pivot point;
said first blade sub-assembly includes an offset tab extending from said first blade sub-assembly blade member upper end;
said second blade sub-assembly includes an offset tab extending from said second blade sub-assembly blade member upper end;
wherein said blade assembly pivot point is an offset pivot point, the axis of said blade assembly pivot point passing through said first blade sub-assembly offset tab and said second blade sub-assembly offset tab;
said first handle assembly and said second handle assembly are structured to pivot relative to each other between a first position, wherein said first handle assembly upper end and said second handle assembly upper end adjacent to each other and a second position wherein said first handle assembly upper end and said second handle assembly upper end are generally spaced from each other;
said first blade sub-assembly and said second blade sub-assembly being structured to pivot relative to each other between a first, open position and a second, closed position, and wherein when said first handle assembly and said second handle assembly are in said first position, said first blade sub-assembly and said second blade sub-assembly are in said first, open position, and, when said first handle assembly and said second handle assembly are in said second position, said first blade sub-assembly and said second blade sub-assembly are in said second, closed position; and
said first handle assembly and said second handle assembly travel between about 6.5 degrees and 10.5 degrees relative to said central longitudinal axis when moved between said first position and said second position.
2. The post hole digger of claim 1 wherein said first handle assembly and said second handle assembly travel about 8.5 degrees relative to said central longitudinal axis when moved between said first position and said second position.
3. The post hole digger of claim 1 wherein:
said first blade sub-assembly blade member is elongated and has a longitudinal axis;
said second blade sub-assembly blade member is elongated and has a longitudinal axis;
said first blade sub-assembly includes an elongated blade base having a longitudinal axis, said first blade sub-assembly blade base longitudinal axis being angled relative to said first blade sub-assembly blade member longitudinal axis; and
said second blade sub-assembly includes an elongated blade base having a longitudinal axis, said second blade sub-assembly blade base longitudinal axis being angled relative to said second blade sub-assembly blade member longitudinal axis.