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Publication numberUS781746 A
Publication typeGrant
Publication dateFeb 7, 1905
Filing dateMay 17, 1904
Priority dateMay 17, 1904
Publication numberUS 781746 A, US 781746A, US-A-781746, US781746 A, US781746A
InventorsCharles H Nesselroad, Richard B Sheldon
Original AssigneeCharles H Nesselroad, Richard B Sheldon
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fireproof block.
US 781746 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

UNITED STATES Patented February '7, 1905.




SPECIFICATION forming part of Letters Patent No. 781,746, dated February 7, 1905.

' Application filed May 17,1904. Serial No. 208,399.

To fr/ 11171/0711 it Vm//z/"l/ non/ecrit:

Be it known that we, RICHARD B. SiIELDoN and CHARLES H. NEssELnoAD, citizens oi the United States, residing at Stuart, in the county otl Guthrie and State ot' Iowa, have invented a certain new and useful Fireproot' Block, ot' which the following is a specification.

The objects ot' our invention are to provide a building-block ot' tireproof material which can be so united with adjacent blocks that the joints between the blocks will be absolutely tireproot', and these joints are so constructed that they will be absolutely tight and tireprootl even though the blocks separate slightly from one another.

A further object is to provide buildingblocks particularly adapted it'or use in chimneys which can be constructed in a single mold, owing to the fact thatall of the corner-v blocks are built exactly alike--that is, the tenon is always on the same side ot' the block and the groove in the block is always on the same side of it. These blocks are so constructed that they can be easily connected with each other.

A further object is to provide a tenon which extends around the entire upper portion ot' the block and is designed to enter into amortise in the lower portion of the block immediately above it.

Our invention consists in the construction, arrangement, and combination of the various parts of the device whereby the objects contemplated are attained, as hereinafter more t'ully set forth, pointed out in our claims, and illustrated in the accompanying drawings, in which*A Figure 1 is a perspective view of one of the blocks. Fig. Q isa perspective view ot' a portion of a chimney with our blocks in it. Fig. 3 is a vertical sectional view of two of the blocks mounted one above the other. Fig. 1 is a moditied form ofthe building-block, showing that these blocks may be made of any shape and are as well adapted for use in walls as in chimneys.

Referring to the accompanying drawings, we have used the reference-numeral to ingles from cach end ot' the body portion and parallel with each other. Extending around the top portion oi' the block-that is, throughout the entire length ot' the body portion and of the flanges 11 and 12 Vis the tenon 13, so shaped as to enter and lit tightly within a groove 11 in the bottom ot' the block, which is to be placed immediately above the tenon 13. The groove 11 is so shaped as to receive the tenon within itand make a lireprootl lioint between the blocks. Cn thc flange 11 and extending vertically ot its outer t'ace is a dovetailed tenon 15. In the outer t'ace ot' the tlange 1Q is a dovetailcd groove 16. Said groove is so shaped and otl such size that one ot' the tenons 15 will enter said groove when it is slid into it from the uppcror lower portion ot said groove. '.lhere are two blocks constructed exactly alike to forni a complete square, such as is necessary for the chimney shown in Fig. E2. Each ot' the blocks has the dovetailed tenon 15 and the dovetailed groove 16 therein, and each has the groove Hand the tenon 13, so that when the blocks are connected with each other the tenon 15 ot' one block will enter the dovetailed groove 16 ot' the other block and the dovetailed groove 16 of the lirstmentioned block will receive the tenon 15 of the second-mentioned block. '.lhus itwill be seen that the parts will be held tirmly in position relative to eachother. However, in practical use a slight amountot' mortar is placed on the tenons 15 before they are slipped into their mating' grooves 16. W'hen one block is constructed in the manner above set out and is held together by tenons and groovesl and 16, respectively, another block is constructed by using the two parts or two blocks to form a single complete block, and said block is placed upon the first-mentioned block, so that the groove 11 will receive the tenon 13 on the block first constructed, and as in practical use there is mortar spread upon the tenon 13 before the block placed above it is put in position an absolutely tight joint will be made between the blocks, as well as between the two parts ofthe complete block. In order to make the chimney or wall more solid and the parts dicate the body portion ot' the block, having i thereofI held in position more rigidly relative the tlanges 11 and 1Q extending at right anl to cach other, the body portions 10 ot' the up- IOO per blocks are placed immediately above the flanges ll and l2 of' the blocks immediately beneath it, thus holding' said flanges firmly in position relative to each other and also preventing' any opening from being made by a slight separation of' said flanges between the adjacent parts of' the tenons' 13.

In building a wall or in building' a chimney of' large size intermediate blocks comprising a -straight body portion and having the dovetailed tenons l5 at one end, the dovetailed groove 16 at the other end, the tenon 13 at the top, and the g'roove la at the bottom are used, so that the wall may be constructed of' any desirable length by the use of these intermediate blocks. The size, shape, and construction of' these blocks may be varied, and different kinds of` material may be used in the construction, so long as some fireproofl material f'orms the body of' the material used and so long as my particular form of' joint for connecting the parts of' the block together and the blocks with each other to hold said blocks one upon the other. In building' a chimney a finishing-block made of' a single piece of' material is preferably used, which Vhas simply the groove la in its bottom portion, so that when this block is placed upon the top portion ofl the uppermost blocl; held together by the dovetailed tenon and groove the groove in the bottom portion will receive the tenon 13, and it will cover up the slight amount of space between the dovetailed tenons and grooves, and thus prevent water or any f`oreign substances getting between the parts of' the blocks, and thus prevent the deterioration of' the material used when the blocks are connected with each other.

Having thus described our invention, what we claim, and desire to secure by Letters Patent of' the United States therefor, is-

1. In a building-block made of` fireproof` material, a body portion, a flange connected with each end of the body portion and at right angles thereto, a dovetailed tenon on the outer f'ace of one of' the flanges, a dovetailed groove in the other of' said flanges, a tenon on the top ofl the body portion and the flanges and extending throughout their entire length, and a groove in thc lower part of the body portion vand the flanges extending' throughout their enthe tenons ofl one of the blocks of' the series i being designed to enter the grooves in mating' blocks in the series.



O. N. CLARK, F. H. HAR'rsnLL.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2539177 *Jun 24, 1949Jan 23, 1951Baylor Leon WPrefabricated block flue
US2701959 *Jul 31, 1946Feb 15, 1955Harold L BriggsSectional block masonry
US3305982 *Nov 13, 1963Feb 28, 1967Ralph B GookinsInterlocking block building construction
US4039280 *Jul 17, 1975Aug 2, 1977Pyro-Zytan Gmbh & Co.Linings for high temperature ovens
US6931803 *Mar 10, 2003Aug 23, 2005Gary DavisModular building system
Cooperative ClassificationE04B2002/0208, E04B2/12
European ClassificationE04B2/12