US1868253A - Heat-responsive closure - Google Patents

Description

July 19, 1932. H. RACKEBRANDT HEAT RESPONSIVE CLOSURE Filed April 10. 1950 Patented July 19, 1932 i UNITED STATES PATBNTOFFwE Brummen RACXEBRANDT, orv HANNOVER-LINDEN, GERMANY' HEAT-ruisPoNsrvn cLosuaE I i L Apjaicaton linea April 1o, 1930, serial 110. Managua-in Germany april` 30,' i929.

My invention relates tov closures such asY doors, slides, gates and the like, and more 'particularly to closures which are subjected to different temperatures on their inner and 5 outer faces. My heat-responsive closure is particularly designed for drying and other furnaces in which-the temperature gradient between-the combustion or drying chamber and the atmosphereis considerable.

It is an objectief my invention to'so design a closure of the kind'de'scribed that it will become heat-responsive, that is, will be able to stand temperature gradients without beingfdistorted, warped `or otherwise de- 15 formed by heat-stresses.

To this end I bund up the inner Shen of the.

closure, that is, the shell which is subjected to the higher temperature, from a plurality of independent and overlapping plates so that Y 2o the' Shen is free to expand without buckling of its plates, `:and secure each plate at its centre of gravity in order to ensure uniformity of expansion of the plates.

I may also, in combination with the built- 25 up layer aforesaid, or independently of it,V

provide means permitting `free expansionof the structure of the" closure. For instance, in a structure or'frame including several connected members like lattice work I may provide expansion gaps of any suitable type, or, in a structure which includes sections,-I may recess or notch a flange, or several flanges, of a section or sections soV that the section `or sections will not buckle under heat stress.

Closures of the kind described are made of sheet metalor steel structure, withl kor without insulating layers. As designed heretofore, 'such structures involve the serious draw- `backthat they warp Vmore or less under the inlluence of the elevated temperature,become leaky and admit Vcold air. vIn 'such cases troublesome and tedious operations are necessary for repackingthe closure. Warping `and other deformations are particularly inconvenient in large doors vor the like which as arule are designed as steel lattice work with an insulating layer. Those portions of :the steel structure which face the interior of the furnace or the'like are heated more inshown, any othertype of sections might he tensely than the portions which are'in'heat V- `siderable resistance against displacement, or

become inoperative altogether.

p These'drawbacks are eliminated Vaccording -to my invention in which the inner layer of '50 the closure is free to expand due to its built- .up construction while the structure 'itself may be provided with gaps or notched sections for heat-expansion. V 1 y In the Vdrawing alixed Vto this specification .g5 and forming part thereof a frameof lattice" workV embodyingniyinvention, and some .of its' details, .are .illustrated` Vdiagramn'iatically by way of example.V .L`

1 In-the drawing* built up'irom channel and angular sections, f `viewed from the' outside ofthe chamberfwhich it is designed to close, 1 11. Figa 2 is a ,section on the line-II-II@;in=15 Fig. 1, f v

l Fig. 3 is partly asection'- showing aportion of a slightly modified frame, andr partly an elevation of 'one of its bars showing the notched lflange ofthe bar section,

Fig. 4 is a detail showing an expansion gap in a member of .the rame,and`

Figs. 5, Gand 7 illustrateyarlous types i Voverlapping plates forV the inner shell.

and, a y,central strut 6, diagonal 8,-all of :channel section, and angle sections 19 extend- -ing in parallel to the transverse bars 4 and 5.

10l is a frame which yIisasecured on the outer l JAfaceof the frameV l, andll isV an unbroken shell `of sheet metal which is inserted between 195 thel outer frame 10 and the membersfof. the mainframe l.

. Instead of channel and` angle sections as provided. y

Fig. `1 is an elevation ofa tramel ywhichis e l i '.rectangularplates 15 in Fig. 5, for circular plates 16 in Fig.,6, and for hexagonal plates 17 in Fig. 7. Eachplate is supported bya detachable bolt 18preferably at `its, centre lof,

gravity.Y The 'bolts 18 are inserted in holes 9 of the yerticalfvflanges of the sections 9,. i Yextend through the insulating layer 12 from 'which they are separated by hollow cylinders 19, andV support the plates of theinn'ershell 14h57 their .heads20. vThe 'overlaps are constitutedby a bevelled portion 21 at the edge Aolf one plate, and la straight portion at the mating-'edgeof thefother plate, as best seen 1n in addition @the bolts isl which are ai;

' ranged 'at the vcentre Vof `gravity of the respective plates, a bolt 22 is provided for each plate outside its centre 'of gravity for preventing flifting of the plates. The bolts 22 -are 'down holdersxonly and will not interfere with the uniform expansion of the plates beoausethey are lnotbraced by 'eylinders'19, likethe 'bolts 18, and also are ,thinner than thefboltslf so that-they mayyieldv transverselyinconformity With the'expansion and p c in Whichthe temperatures fatthe mner andV j fouterfacesof-f the closure are different, comcontraction of the plates. n

Referring now to Fig.v 4,ione ofthe mein- "bers 'ofthe frame -1 'which have been shown G11., for instance', the longi- :secured to the Webof L'on'efof the parts byl rivets or the like 24:, and 25 are bolts Yforthe ylike on vthe other part ofthe 'bar which enterl emadeasiotscean-ths'shgpia sa lIn'stea'd vof dividing the membersas illus# trated, their .flanges Amay be lrecessed or notched yas shown at '26 for lthe longitudinal 2 in Fig. y3, so that Whenfheat-'expansion ocy *l `o'ur's, the flanges Will not buckle under the Stress. l y p Y Bi'rect Vaction'of'the Vheat on the outer shell ,L11 afm-'d the .parts Which -.are connected with it,

'is' preventedby the insulating layer 12, While y those parts which V"are'subject/edito directv naeti'o'n'of the'iheatare fsoi'de'signed, that they 55 `are free to "expand substantially yWithout stress. IThis problem mayfrbe vksolved Vin variou'sfway'sasdescribed.

i v'-seleotion of particular "modification of 7765Kthe invention isrv intended to theexclus-ion' 'of 1 gravity. f

Vis built up from over-lapping plates, and

in'eans for 'securing-Teach plate to saidframe at its centre of gravity. l

2. A'heat-responsive closure for structures in Which the temperatures at .theinner and outer faces of the closure aredifferent, comprising a iframe, a shell lonrsaidwfr-ame Which is built up fr oinover-lapping plates, means for securing each; plate to Asaid frameat. its

'center v*of gravity,and.means secured outside said centresof 4gravity yfor holding downsaid plates. .1 y

3; A heat-responsive kclosure Vfor:structures inwhichA theV temperatures lat the-inner vand outer facesfof theclosure are different,fc`om,- prising a frame, an outer shellpon said frame, an insulating-layer on said yshell, Von the side exposed to the higher temperature, ai shell builtup of'over-lapping plateson the-faceofv said insulatinglayer, and `bolts extending through said insulating `layer and said shells forv securing said-plates attheir centresV of y gravity 4. vA, heat-responsiye closure for structures prising a frame, van outer shell onsaid frame,

exposed tothe higher temperature, a shell for securing said platesfat theircentres of outside saidc'entres ofgravity. l Y

5. A heat-responsiveclosure for 'structures in Whichvthe'teniperatures ,at the inner and outer faces of the closure 4are different, comprising a frame, anouter shellon'said frame,

built up of over-lapping plates Withfone'of for. securing sai d yr plates .at their jcentrfes of Y 6. A `heat-responsiveclosure forstructures `in Whiclhthe temperature 'at 'the inner'and `outer facesV ofthe closure are different, crom- .If/'li prisingaframe, means insaid frame ,-for {permittingheatr exp ansion, a shell y on Vsaid frame frameatits centre off'gravity. Y f fr Abuilt uprof--overdapping .plates on the facey of 'said insulating) layer,^. bolts extending through said insulating layer and said shells.

Tie

LanA insulatinglayer on said shell 4on the side 1 exposed to' thehigher temperature, `arshell which is built upv from overflappingplates, v and means for securing each plate to said 7. A heat-responsive closure for structuresV in which the temperatures at the inner and outer faces of the closure are different, comprising a frame eonsistingpartly of anged members, a notched ange on one of vsaid* members, a shell on said frame which is built up from over-lapping plates, and means for securing each plate toy said fra-me at its centre of gravity. Y

In testimonywhereof I ax my signature.

HEINRICH RACKEBRANDT.

Images