Patents of Interest to Builders.

Progress, Volume XIV, Issue 11, 1 July 1919, Page 556

Patents of Interest to Builders.

Concrete Ships, Buildings, Tanks, etc., Construction —A patent, No. 40012, has been taken out by Arthur G. St. Clair Isbestcr, of Takapuna, Auckland. It comprises re-

inforced-eoncrete planks, dowels uniting the planks edge to edge, and strips of felt between the said planks. Dogs may be employed to unite 'the planks end to end. Other features are contained in invention.

Concrete Building Construction —A patent, No. 41345, has been taken out by John W. Tong, of Hawera. This invention relates to building constructions of that class wherein cast concrete pillars and slabs are employed. The pillars are made with bevelled rebates, and the ends of the slabs which fit against the pillars have corresponding rebates, the rebates forming a key. The pillars also have a tongue or rib less 'in depth than the thickness of the slabs, whereby a cavity is formed to receive grouting. In the construction of hollow walls .the outer slabs arc lined with waterproof material, such as malthoid waterproof paper or the like, and the ends of the inner slabs have lips opposite the pillars. Bolts embedded in the pillars pass through the out-

cr slabs and the waterproof lining, and through the lips of the inner, slabs, which bear against and support the waterproof lining. The bolts have washers and nuts let into recesses formed in the inner slabs, the said recesses being afterwards filled with concrete grouting or cement. The" intermediate ends of the slabs are grooved to form recesses into which grouting is run, and the upper and lower edges of the slabs have a double bevel to form a key, the said edges being laid in grouting or cement. In walls made of a single thickness of slabs the bolts pass into internal pillars, and a layer of waterproof material, such as malthoid waterproof paper or the like, is interposed between

the interior pillars and the ends of the slabs., Slabs forming the partition walls of a building have bolts embedded in their ends, and these bolts pass through the inner slabs of the outer walls or into a door or window jamb. The ends of the slabs have grooves forming recesses for grouting. The pillars are reinforced with vertical iron rods or wires, and wire loops encircling the vertical rods or wires. The lower ends of the pillars are embedded in the foundation of the building. Bolts are also embedded in the slabs to secure top plates made of wood or concrete. At the corner of a building a pillar is provided with double-bevelled rebates to fit upon the bevelled rebates of the slabs which meet at the said corner, and the lips of the inner slabs arc shaped to fit the interior angle of the outer slabs. Bolts

embedded in the pillar pass at an angle through the said corner of the building. Spaces are left in a wall for window and door frames, and the sill of a winddw-framc fits over the outer and inner slabs, and has a flashing underneath. The head of a frame has a fillet fitting between the slabs and a flashing below the edge of the outer slabs. " The door-jambs are grooved, to receive the edges of the slabs, which are secured thereto by embedded bolts.

Concrete and Like Structures—A patent, No. 41284, has been taken out by Alfred J. Dunn, of Birmingham, England. Pillars, corner-pieces, standards, and the like arc formed with a central body portion, which may be solid and reinforced in any suitable manner, if desired, of substantial cross-section from which keying-nibs or fillets project. The projecting keying-nibs or fillets arc formed with angular

terminal edges, each edge being preferably in the central vertical plane of the projection, and the preferred inclination for the sides of the angular edge is such that the angle between them is a right angle. One, two, or more of these keying-nibs or fillets will be formed on each face of a member to which a- wall, partition, or the like is to be formed by casting operation or by slab-work erection in the known manner.