Patents of Interest to Builders.

Progress, Volume XVI, Issue 12, 1 August 1921, Page 286

Patents of Interest to Builders.

Roof-Ridge Cuffing.— A patent, No. 43,846, has been taken out by Louis jenkinsoh, plumber, of' Auckland,

which consists in an integrally formed bend on each si fie of capping shaped to overhang a recess the full length of capping, and. with apertures in the recess-top. ' • Brick Manufacture.— A patent, No. 45,351, has been taken out by ; W. W. Crawford, Kew Gardens, London which consists in taking any kind of earth and (or) soil

and (or) clay, burning the same in an oxidising atmosphere at a temperature of about i,soodeg. C. and then mixing it with a relatively small quantity of previously dehydrated Portland or like cement, moistening the mixture, pressing it into moulds, immersing the moulded bricks in cold water for several hours, and air-drying them at a temperature only slightly above freezing-point.

' Concrete Wall.— A patent, No. 44,843, has been taken out by G. H. Forester, of England, for a new method of building a concrete wall. According to this invention, a device for use in the construction of walls consists of a tube, which may be of concrete or cement, having a bar projecting from each side. . In the cr.sc of a hollow

wall, sets of two tubes are placed in alignment, one in each part of the wall, each tube being of a length corresponding with the width of each of the parts of wall respectively. The plates or boards which form the moulds for the walls are tied together bv rods which pass through the tubes which form distance-pieces between the outer and the inner plates or boards. After the concrete of which the walls are formed has set the

rods and the plates or boards are removed, and screwbolts are inserted into the tubes, passing through holes in the bars projecting from them and secured by means of nuts which engage with the bars. .:. Ties securing the. two walls together are thus formed! Single walls may be made in similar manner. In all cases holes may be made in the parts of the bars which project from the tubes, and adjacent tubes are connected together by horizontal reinforcing-bars, • whilst vertical reinforcinebars are inserted through the holes.

Concrete Fencing Post.— A patent, No. 45,160, has been taken out by A. M. Mackay, of Patangata, Hawke's Bay. According to this invention, the post is made hollow, and is reinforced by rods running lengthways therein, the said rods being bound together or connected by horizontal reinforcements. A horizontal hole is made through both sides of the post for each fencing-wire it

is desired to attach thereto. The fencing-wires are attached to the post by short pieces of wire, which, after being doubled around the fencing-wires, are passed through the holes in the post, and the legs twisted together around a vertical rod at the rear of the post.

Concrete Pife—k patent, No. 43,498, has been taken out by W. H. Stevens, of Hamilton, civil engineer The conduit, which is formed preferably of concrete or

earthenware, is constructed with a flat base of a width either greater or at least equal to the width of the conduit, so as to provide the latter 'with as large a bearingsurface as possible. To enable this to be done, blocks with flat under-surfaces and hollowed upper surfaces and recessed around their upper edges are laid end to end in the trench or elsewhere and jointed by means of a binding-composition placed in the cross-channels formed by meeting recesses at the ends. The sides and top of die conduit are made integral and in sections of a length

equal to the length of the blocks, tin- ends of said sections being bevelled or recessed. The sections providing the sides and to]) are placed on the blocks so as to rest in the longitudinal recesses thereof, and so that the joints between said sections are directly over the centres of the blocks, thereby the weakest points in the sides and to]) of the conduit are supported on the strongest parts of the blocks. The sections providing the sides and top are secured together and also to the blocks by means of a binding or jointing composition.