US415339A - Mark fawcett - Google Patents

Description

M. FAWOETT. CONSTRUOTIONOF FIRE PROOF FLOORS.

Patented Nov. l9. 18879.

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Wifiii Willi/i7 UNITED STATES PATENT OFFICE.

MARK FAIVCETT, OF LONDON, COUNTY OF MIDDLESEX, ENGLAND.

CONSTRUCTION OF FIRE-PROOF FLOORS.

SPECIFICATION forming part of Letters Patent No. 415,'339, dated November 19, 1889.

Application led December 20, 1888i Serial No. 294,199. (No model.) Patented in England February Z5, 1888, No. 2,815.

To @ZZ whom it may con/cern:

`Be it known that I, MARK FAWCETT, a subject of the Queen of Great Britain, residing at London, in the county of Middlesex, England, have invented certain Improvements in the Construction of Fire-Proof Floors, (for which I have previously obtained Letters Patent in Great Britain, dated February 25, l 888, No. 2,815,) of which the following is a clear, full, and exact description.

My invention relates to improvements in the construction of fire-proof floors, and has for its object to incase and so protect the iron or steel joists or girders or other load-carrying material used in such floors, to dispense with the use of centering in the construction of such floors, to reduce the dead-weight of such floors, and to enable them to be constructed more expeditiously and economically than heretofore.

My invention consists of a floor formed or constructed with flanged tubular lintels as the special feature. These lintels are made of re clay or other `fire-proof material and of various sections, which are arranged to rest on the lower flanges of iron or steel joists or girders and to pass under the lower flanges of the same, an airspace being formed between the under surface of the joists or girders and the lower part of the tubular lintels. Concrete is placed between and over the tubular lintels, so as to form concrete arches, which take their bearing on the lower flanges of the joists or girders independently of the lintels. The function of the tubular lintels is to protect the joists or girders from the action of tire, to act as centering until the concrete is set, and to reduce the dead-weight of the floor. Dovetail grooves are formed in the under surface of the lintels to make a key for the plaster or other material of the ceiling below.

In order that my invention may be more fully understood, I have shown the same in the accompanying drawings, in which- Figure l is a horizontal section or plan; Fig. 2, a longitudinal and Fig. 3 a transverse section of my improved construction of fireproof floors. Y

L L are the flanged tubular lintels, whose upper parts have a semicircular transverse section, while their lower part is flat, as shown, and furnished with lateral liangesff and beveled edges. The under surfaces of these lintels are further provided with longitudinal dovetail grooves g g, serving as a key or fixing means for the plaster or other material of the ceiling below.

The joists or gir-ders J J are xed at a suitable pitch to give the required strength, and the lintels L L are made of the proper lengths to slot in between the webs w Iw of the joists or girders J J and to rest on the lower flanges a a thereof. The lintels L L are fixed in such a manner that their lower or flat portions p p are below the bottom flanges a aof the joists or girders, leaving an air-space S between the two.

The lateral flanges f f, owing to their peculiar shape, allow the concrete, which fills the space between the same and covers the lintels L L, to have a direct bearing on the lower flanges a a of the said joists or girders J J, this concrete supporting when set the flooring and the load placed thereon.

The floors are finished in the ordinary manner with boards, wood blocks,stone, bricks, tiles, cement, asphalt, and the like, while the ceiling below the saine is formed with plaster or other suitable material. The j oists or girders can also be perforated, as shown at d CZ, making the air-space in the upper part of the tubular lintel continuous, in addition to the air-space S. The air-spaces thus formed, being continuous, constitute a flue or conduit for the outward passage of foul air or heat through the walls into the open air outside.

My improved lintel enables me to protect the loadcarrying material, to dispense with centering, and to considerably reduce the dead-weight of the lloor, while permitting floors to be constructed expeditiously and economically.

Having thus particularly described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In fireproof lioors, the combination of metallic joists or girders with flanged tubular lintels arranged in adjacent rows and with air-channels formed below and across the said joists or girders and above the bottom of the IOO said lintels, substantially as and for the purpose described. l

2. In lire-proof floors, the combination of flanged tubular lintels resting at intervals upon the bottom flanges of metallic joists or girders, and Whose under surface is provided with longitudinal grooves forming a key or hold for the plaster of the ceiling below, with a covering of concrete to support floors of Wood, stone, or other material, said lintels being provided With lateral flanges f, running transversely to the girder and situated below the bottom ilan ge thereof, substantially as and for the purpose described.

3. In fire-proof floors, the combination of metallic joists or girders perforated to form arranged diagonally thereto, substantially as set forth.

MARK FAVCETT.

Witnesses:

A. J. ELrs, FRANK HUGHES, 7 G Chancery Ldne,London, W. C.

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