Sampling drill

A sampling drill comprising a plurality of drill rods coupled together to form a drill stem suspended from a drill head;

• said rods including each a pair of substantially concentric tubular members defining an inner central passage and an annular passage;
• the lower end of said stem being fitted with a drill bit including a neck, cutting edges and means defining an inner chamber means in said bit, said chamber means being connectable to said central passage, and means defining at least one passage in said bit, connected in fluid communication at one end of said annular passage and at the other end to discharge into said chamber means;
• said chamber means being provided with openings located adjacent said edges so that material cut by said bit can pass into said chamber means;
• wherein the lower end of an inner member of said drill stem is connected to a tubular member, the lower end of which latter slidably passes through said neck in sealing engagement therewith to seat on a central boss within said chamber means, to constitute means for shutting off said central passage to prevent the material from entering said chamber means and entering said central passage.