US12035A - Improvement in casting metal window-sashes - Google Patents

Description

UNITED STAT-Es PATENT OFFICE.,

'rnoMAs J. sLoAN, oF'NnW'fYo'nK, n.. y.'

IMPROVEMENT 1N CASTING-METAL wmno'w-snsm-:sl

Specilication forming part of Letters Patent No. 12,035, dated December .5,.1854 z Be itknown that I, THOMAS J. SLQAN, of the city, county, and State of New York, have invented a new'and'useful Improvement in the Method of Casting Window-Sashes, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, making part of this specil vfication, in .which- Figure lis a face view of asash cast on my improved plan as it is taken from the mold,

and Figs. 2 and 3 sections thereof taken the lines A a and B b of Fig. 1.

, The same `letters indicate like parts `in all the figures.

It is important that the side and end rails of window-sashes, vparticularly. theside rails,

should be straight, n account of fitting the Window-frames accuratelyl.

. Cast-iron sashes havev long been recognized as presentingmany advantages over wooden sashes; but the use ot' them hasb'een much' retarded on account ofthe diiiculty' o f cast ingthern with the end and side rails straight,

particularly thelatter.4 And this diiculty arises from the fact that the side and end rails are connected aty given distances apart, depending onvthc intended size of the glass, by bars that extend fromI side rail to side/rail .and from end rail to end rail; and also from the fact that'cast-i-ron lin cooling contracts at the rate of about one-eighth of an inch to the foot. And as the form of the sash to be east is irstrnolded in sand, Src., it follows that as.

the barsconnecting the rail's lcontract in cool- 'ing they draw the rails inward, while the other portions ot' the lengthv ofthe rails are held lback by the sand or other substance of Lth'e m old,and in consequence of these two opposing forces tlierails,l when .the sashes are taken out ot' the molds, vare found to be bent between the points of connection with the bars, the'extentoil which will depend upon vthe distance betweenthe connecting-bars, and .somewhat upon the quality of the iron and the firmness ofthe mold.

The object of my invention vis toiavoid this defect in the making of cast-'metal sashes; and to this end the nature of mygin'vention consists in casting metal sashes with a net-work or military bars connected with -the rails and be f en the bars for the reception of the glass,

and so near together that in the process of -cooling and contracting they will drawI theA railsinward along their entire length to the same extent as the bars forvthe reception of:

the glass, and thus 'not only produce sashes vwith straight rails, but of greater-strength than whencast'in theusual way, for the auxi iliary bars or net-work will take a portion' ot"` the strain,- whichy otherwise would be sustained wholly-by the main bars in theprogress of contraction, and thus render them less lia.-y

blc to break.

In the accompanying drawings, a a represent the side rails of a`castiron sash, b b the f end rails, and c c and d d' the cross and longiv tudinal main bars, formed with rabbets'vforth'e In each open space for the reception of a pane of glass there arev reception of the glass.

longitudinaland cross auxiliarybars 'e e and f f, and so arranged as to be iu line throughout the length and breadth'ot thesash. The

number ot' these auxiliary bars will depend upon the size of the space between the vmain bars, and they should b eI sufficiently numerous to insure the keeping ofthe rails straight in the process of contraction. i

In cast-ing sash forftwelve-bysixteen panes" .I have found two longitudinal and two'cross bars sutiicient. These `auxiliary bars should he reduced in size at their junction withfthe rails and main bars, as represented 'in -tlfe drawings, so that afterthe casting has cooled down they can be readily cut or broken out. The thickness of metal at the junction should bejust suiicient'to insure the drawing in lot" the rails against the resistance of the mold in the process of'contraction'. y I

The. proportions represented. in the draw? ings I hye found to answer a good purpose in practice. l

I wish it to be distinctly.understood that I do not iimit myself to the number or magnitude of the auxiliary bars to be used, as these 'may be varied -to suit circumstances, as before

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