US92205A - Improved metallic door or shutter - Google Patents

Description

v ttuitrd ltere @will @titille ALFRED B.MULLETT AND BARTHOLQMEW OERTLY, 0F WASH? moron-,DISTRICT or COLUMBIA.

Letters Patent No. 92,205, dated July 6, 1869; antedated .Tune 30, 1869.

IMPROIEID METALLIC DOOR OR SHUTTER.

The Schedule referred to i'n theae'Lettexs Patent and making'paxt o'fl the neme.

10 all whom ,llt Ina/y concern Be it known that we, ALFRED B. MULLETT' and BARTHOLOMEW OERTLY, both of the city of Wash the following isa sufliciently full, clear, and exact description' thereof to enable one skilled in the art to which our said invent-ion appertains, to make and carry it into effect, reference being had to the accompanying drawings, which are made a part of this specification.

Our invention consists in an 'improved manner of constructing fire'proof metallic doors and'shutters, by framing and bracing them together in such a manner as to dispense with Welding the frame, and thereby reduce the cost of manufacture, and facilitatethe introduction of tire-proof material.

In the drawingst.

Figure 1 is a front'view of one of our improved doors or shutters, certain parts being removed, in order to expose parts in rear thereof, as hereinafter explained. .Figure 2 represents a longitudinal sectionj at x x,

Figure 3 represents, on a larger scale, a partial sec-` tion in the same plane as fig. 2.

'Figure 4 is a longitudinal sectional view of the edge frames hereinafter described.

Similar letters of referencej indicate corresponding parts in all the figures.

A A representmetallic sheets, secured at their edges to straight rigid bars B B', by means gf rivets or bolts u. a, which may extend completely through from one face to the other of the shutter.

Crossed diagonal braces, D,' are employed to afford additional strength and rigidity to the structure.

To afford convenient means of securing'the ends of lthese braces the edge flames B B' may be made each in three parts, the central one, B', of which being of greater width than the vothers, projects between the ends of the braces which are riveted to it, leaving their faces Hush with the frame,'and permitting the shee metal to be placed evenly over the whole.,

' O represents a body of plaster of Paris, or other nonconductor of vhea t,pwhich is poured in through an open end of the door or shutter, while one end piece ofthe frame B is 'ou t.

In iig. 1, the upper part ofthe frontmetallic sheet A is omitted, to expose the braces D and lire-proof filling, andportions of the tireproof filling O are also omitted, showing the rear brace and sheet-metal shell or casing A.

' -Where the parts to be rivetedtogether do not come A in contact, metallic tubes or washers are inserted, as shown at ll in lin'. 1, and d in tig. 2, so 4as to afford a firm andlrigid bearing.

If preferred, the edges of the door or shutter may be formed by bending either the front or the'rear shell over and around the rigid frames.

We produce, ata less cost than the usual sheet-iron shutter, riveted t0 a welded frame, a strictly fire-proof shutter, offering double the resistance to burglars, and are enabled .to-furnish vit as so low a price as to enable their use onwarehousesor any other buildings, where protection' from lire and burglars is essential.

Our divided frame also affords 'greattacility for pouring in the fire-proof material.

Any suitable moulding may be formed upon the bent edges ofthe sheetemetal shells.

The necessary rebates may be produced Zby setting the stiles or frame-pieces alittleforwardor back from theedge of the door or shutter:

We claim as new, and desire to secure by Letters Patent- A metallic door or shutter, made by riveting vor bolting two sheets of metal to rigid bars B and braces D, laid between them without welding, all substantially as and for the purposes herein specified.

- A. B. MULLETT.

Witnesses: B. OERTLY.

GnaG. LYON, GORDON MAcLnoD.

Images