Portable earth drilling apparatus

Drilling apparatus comprising an extensible mast including a fixed lower ramp, including a pair of posts with cross-bracing means, an upper movable slide slidably mounted on said lower ramp between retracted and extended positions, said movable slide including a pair of posts with cross-bracing means, a rotation head slidably mounted on said upper slide for movement along the length of said slide, means for synchronizing movements of extension and retraction of the slide with respective ascending and descending displacement of the rotation head, the synchronizing means comprising two double-acting jacks connecting the lower portion of the fixed ramp to the upper portion of the movable slide, a first pair of chains, a pulley mounted on the upper extremity of each of the posts of the movable slide, each chain having one end fixed to the rotation head and an opposite end fixed to the cross-bracing means connecting the posts of the fixed ramp, a second pair of chains, a second pulley mounted at the lower extremity of each of the posts of said movable slide, each of the second chains being fixed at one end to the rotation head and at the other end to the cross-bracing means connecting the posts of the fixed ramp, and roller means guiding the movement of the upper slide on the fixed ramp during retraction and extension, said roller means including first rollers mounted on the movable slide at the lower extremity thereof and in rolling contact with the fixed ramp and second rollers mounted on the fixed ramp at the upper extremity thereof and in rolling contact with the movable slide, and means supporting the first and second rollers respectively from the movable slide and fixed ramp for pivotable movement.

Drilling apparatus comprising an extensible mast including a fixed lower ramp including a pair of posts with cross-bracing means, an upper movable slide slidably mounted on said lower ramp between retracted and extended positions, said movable slide including a pair of posts with cross-bracing means, a rotation head slidably mounted on said upper slide for movement along the length of said slide, means for synchronizing movements of extension and retraction of the slide with respective ascending and descending displacement of the rotation head, the synchronizing means comprising two double-acting jacks connecting the lower portion of the fixed ramp to the upper portion of the movable slide, a first pair of chains, a pulley mounted on the upper extremity of each of the posts of the movable slide, each chain having one end fixed to the rotation head and an opposite end fixed to the cross-bracing means connecting the posts of the fixed ramp, a second pair of chains, a second pulley mounted at the lower extremity of each of the posts of said movable slide, each of the second chains being fixed at one end to the rotation head and at the other end to the cross-bracing means connecting the posts of the fixed ramp, flexible conduits connected to said rotation head for supply of pressure fluid thereto, and means for connecting said flexible conduits to said rotation head and to said mast including a fixed coupling secured to the cross-bracing means for the posts of the lower ramp, said conduits each including a section connected at one end thereof to said fixed coupling in sealed relation and at its opposite end thereof to said rotation head, and support means on said movable slide on which said conduits are wound.