Soil-displacement drill and method for manufacturing a pile
First Claim
1. A soil-displacement drill comprising:
- a drill pipe having a lower end;
a head having an upwardly extending cylindrically-shaped portion and a downwardly directed conically-shaped portion having an apex, said head being mounted on the lower end of said drill pipe;
at least two equally spaced spiral ribs appending from said head, each spiral rib defining a substantially vertical section extending from the apex of said conically-shaped portion to said cylindrically-shaped portion and a substantially horizontally extending radial section extending around a portion of said cylindrically-shaped portion as an extension of said substantially vertical section.
1 Assignment
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Accused Products
Abstract
To the drill pipe connects a head comprising a cylinder-shaped portion and a cone-shaped point. Three spiral ribs are regularly distributed over the head. Each rib has a downwardly-extending rib portion standing on the point and having an outer side making an angle between 0° and 5° with the drill axis and an inner side making with the outer side of the point an angle which is smaller than 90° increased by half the apex of the point, and has a outwardly-extending rib portion standing on the cylinder-shaped head portion and having a top side making an angle between 85° and 95° with the outer side of this head portion. The lowermost edge of the rib portion standing on the point merges into the outermost edge of the other rib portion. The apex of the point lies between 85° and 95°.
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Citations
17 Claims
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1. A soil-displacement drill comprising:
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a drill pipe having a lower end; a head having an upwardly extending cylindrically-shaped portion and a downwardly directed conically-shaped portion having an apex, said head being mounted on the lower end of said drill pipe; at least two equally spaced spiral ribs appending from said head, each spiral rib defining a substantially vertical section extending from the apex of said conically-shaped portion to said cylindrically-shaped portion and a substantially horizontally extending radial section extending around a portion of said cylindrically-shaped portion as an extension of said substantially vertical section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification