Coupling for connecting together building units

Claim 1

In apparatus for connecting building units having open end portions, at least one of said units having a first opening formed lengthwise therein extending from the open end portion and including a second opening formed in one side of the unit and extending into the first opening, the improvement comprising a ram member disposed within the first opening of the one of the building units and including engagement means for engaging the other of the building units, means forming recesses in at least two sides of the ram member, one of the recesses providing a surface in the form of a sloping plane obliquely positioned in the longitudinal direction of the ram member and the other recess providing a similar surface at right angles to the sloping plane surface of the one recess and obliquely positioned in the Longitudinal direction of the ram member, a casing member engaging the ram member and having an opening formed in one side thereof to provide a passageway between the second opening of the building unit and either one of the recesses formed in the ram member, and a screw cooperating with the openings formed in the building unit and the casing, the screw adapted to abut either of the sloping plane surfaces of the recesses formed in the ram member when the engagement means of the ram member engages the other of the building units.