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US 5,289,887 AGranted
Method of operating an earth boring machine
AssigneeTracto-Technik Paul Schmidt Spezialmaschinen
InventorFranz-Josef Puttmann
Life of this patent
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Abstract
In a method of operating a ram boring machine having a rotatory-thrust drill rod an impact force is applied to the rear end of the drill rod. The boring machine includes a thrust unit and a striking tool that are combined to form a thrust/percussion aggregate.
Claims20
An earth boring machine, comprising:
- a rotary-thrust rod and having a front end located in a drilled bore and a rear end outside of the drilled bore;
- a rotary-thrust unit for imparting a rotary-thrust movement to said drill rod;
- a striking tool for applying an impact force to the rear end of said drill rod, said striking tool and said rotary-thrust forming together a thrust percussion aggregate;
- and
- a head with an oblique face provided at the front end of said drill rod for controlling the progress of the drilled bore.
2 more elements
A method of operating an earth boring machine including a rotary-thrust drill rod having a front end located in a drilled bore and a rear end outside of the drilled bore, said method comprising the steps of:
- providing, at the front end of the drill rod, a head having an oblique face for controlling progress of a drilled bore;
- imparting a rotary-thrust movement to the drill rod;
- applying an impact force to the rear end of the drill rod upon registration of an obstacle to advancement of the drill rod;
- temporary interrupting rotation of the drill rod for changing an advancing direction of the drill rod.
1 more element
Dependencies are inferred from the claim text.