Drill guide

In a hand drill guide of the type comprising:

• an annular base provided with a central bore large enough to allow displacement thereacross of a collar and chuck of a hand drill;
• a plurality of telescopic leg assemblies distributed along said base and projecting perpendicularly therefrom, each leg assembly comprising a hollow cylinder having one end fixed to and closed by said base and another end closed by an end wall provided with a central opening, and a rod having an upper end, a lower end and having an upper portion slidably mounted in said cylinder, said rod extending out of the cylinder through the opening in the end wall thereof;
• an annular positioning head suitable for lying firm against a surface of a member to be drilled, said positioning head having a central bore and being connected to the lower ends of the rods and extending parallel to the base;
• an annular drill holding assembly;
• and
• means for mounting said drill holding assembly between said cylinders selectively at one of a plurality of locations along said cylinders;
• the improvement wherein, in each of said leg assemblies:
• the rod comprises a retaining ring rigidly connected thereto at a given distance from the upper end of said rod inside the cylinder to prevent said rod from escaping from cylinder;
• a ring is floatingly mounted around the upper portion of the rod above the retaining ring, said floating ring being snugly slidable in the cylinder;
• a first spring is mounted inside the cylinder around the rod between the floating ring and the retaining ring;
• and
• a second spring is mounted inside the cylinder between said floating ring and said one end of said cylinder closed by the base;
• said first and second springs holding said floating ring in a position adjacent the upper end of said rod when the retaining ring rests against the end wall of the cylinder and said first and second springs are uncompressed.