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Publication numberUS933774 A
Publication typeGrant
Publication dateSep 14, 1909
Filing dateJan 27, 1909
Priority dateJan 27, 1909
Publication numberUS 933774 A, US 933774A, US-A-933774, US933774 A, US933774A
InventorsGeorge Maschino
Original AssigneeGeorge Maschino
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Concrete chimney construction.
US 933774 A
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Description  (OCR text may contain errors)




933,774.- Patented Sept. 14, 1909.



Specification of Letters Patent.

Application filed January 27,1909. Serial No. 474,369.

To all whom it may concern:

Be it knownthat I, Gnoncn MAsoHINo, a citizen of the United States, residing-at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Concrete Chimney Construction, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to improvements in chimney construction and particularly to improvements in chimneys made up of concrete or cement blocks; and an object of my invention is to provide a chimney which will be free from defects and which will require no flue lining.

Another object of my invention is to provide a chimney which will be simple and comparatively cheap in construction and which will be susceptible of being rapidly built.

Briefly described, my new chimney is built up of hollow concrete blocks each of which is vformed with a shank or tenon on one endand a cavity or recess on theother end,

which recess or mortise receives the tenon of the block above. These blocks support their own weight and the total weight of the chimney is supported by a strong concrete foundation. In building the chimney, the cost of the usual timber framework is saved and there is a further saving in the cost of labor, in the cost of mortar and in the cost of the chimney material itself. Further, the cost of the flue linin is saved and the danger resulting from defective flues is avoided, since the box-joint between the blocks prevents escape of flame. In the ordinar brick chimney the flue lining is liable to all out of lace and the mortar between the bricks is liable to crumble and then be-.

- come displaced, whereby an opening is left for the escape of fire tothe woodwork surrounding the chimney. Further, it frequently occurs that a brick itself is defective, or becomes crumbly or friable and then gives .away, thereby leaving a hole in the chimney between the partitions and floors, where it cannot be seen. Danger of fire from these causes is removed in my new chimney.

In the drawings illustratin the principle of my new invention and'the iest mode now known. to me of applying that principle, Figure 1 is a perspective. view of one of the intermediate chimney blocks used in the construction of my new chimney; Fig. 2 is a perspective view of a floor block which is used where the chimney passes through the roof or the floors; Fig. 3 shows in section two blocks assembled and a third block in line with but separated from the assembled blocks; Fig. 4 is an elevation of a chimney constructed of my new blocks, the floors and roof being shown in section; and Fig. 5 is a section on the line AA of'Fig. 4.

As shown in Figs. 1 and 2, the chimney blocks are hollow. The intermediate chimney block a is formed at its upper end with a rim Z) which forms the wall of a recess or mortise I), and at its lower end with a tenon or shank 0. The latter fits snugly in the recess or mortise b in the upper end of the block below it and is held therein by the rim 6 and by a layer of cement d.

In constructing the chimney e, where the latter passes through the floors f and the roof g, floor blocks h are used. These are formed with the recess hand tenon 0 for the same purpose as in the case of the intermediate block a. The floor-blocks are further formed with outwardly-extending ribs i, which serve to permit the circulation of air between the floor 7' and the chimney and to give rigidity and thereby prevent tipping of the blocks or buckling of the chimney. The base of the chimney rests upon a concrete formation 7' and the base-block 7c is formed in the mold with an aperture m for the reception of the pipe or flue, thereby avoiding the necessity of breaking out a hole to receive the stovepipe as is usually done in the case of the ordinary brick chimney. Should it be necessary to straighten my new chimney,'that may be done by increasing the thickness of the cement layers (Z on one side. The box-joint between the blocks is air-tight and avoids all danger of the escape of flame. The box-- joint is further a firm connection between the adjacent blocks and dispenses, with the expense and complexity of construction entailed by the use of locking devices and bracing or supporting devices. The ribs 2" insure the circulation of air and the cooling of the chimney at the points where ignition due to overheating is most likely to occur.

I claim:

A plurality of hollow chimney blocks of cem'entitious material; each of said blocks having a recess in its top and a shank proje'cting from its bottom; the shank of one of said blocks fitting snugly in the recess formed in the other of said blocks; and each of said Patented Sept. 14, 1909.

- grolongation' of the ribs on theother of said looks and serving. to cooperate with the walls of'said recess and the shank therein mounted to prevent buckling.

In testimony whereof I have hereunto set mfy hand at said Boston, Mass, this 25th day 0 January, A. D., 1909, in the presence of 10 the two undersigned witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2539177 *Jun 24, 1949Jan 23, 1951Baylor Leon WPrefabricated block flue
US4478208 *Jan 23, 1984Oct 23, 1984Pitha Jay RFireplace construction
US5946880 *Nov 12, 1997Sep 7, 1999William S. Morrison, IIIFilament wound tubular column
US6024085 *Jul 23, 1998Feb 15, 2000Hodge; Deborah L.Modular fireplace
US6109257 *Jul 23, 1998Aug 29, 2000Hodge; Deborah L.Modular chimney
US6955024Feb 28, 2003Oct 18, 2005North Pacific Group, Inc.Filament wound structural light poles
Cooperative ClassificationE04D13/1407