US1010706A - Method of making composite wooden bodies. - Google Patents

Description

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IUhl'llfi \\'()()l)l'1.\' BODIES. (Run. 'ltlxans. llehuenhorst, Germany. Filed h'ept. J0. 1 10. Serial No. 58:2, l2. 1'0 all whom it may concern:

lle it known that I, Cant. 'ltimrzs, manufacturer, and a subject of the (lrand Duke ot' ()ldenburg, German Empire, and a resident. of tihlenstrasse 4, in the city of Del-i menhorst. Grand Duchy of ()ldenbiu'g. and (itlltltlll l'hupire, have invented certain new and useful Improvements in Methods of; Making Composite Wooden llodies, which the following is a specification. This invention relates to improvements in; a method of manufacturing spheroidah bodies from u pluralitv of superposed wood; veneers. Bodies of this class are in extended use in the manufacture of eoverings fol;- the bodies'of automobiles or the boxes of. 'arriages. and the like. and they consist of a plurality of thin superposed wood veneers. in the manufacture of such bodies much difficult) is caused by the double curvatures of the same which render it. ditlieult to get tight joints between adjacent. veneers.

By my invention a strong. tight and practically invisible joint is produced which need not be coated with canvas before a pplying the varnish theret .\s is known in the art. before. varnishing the surfaces a coating is applied thereto. and the said coating is afterward ground with water. in this operation the coating is ground through at various points. and when u ing canvas as a covering the said canvas imbibes the water used in grinding. whereby it is partly loosened. The method is also objcetimiahle.

\ because the materials are not uniformly dri d. and because the materials are in diff r nt degrees expanded by heat. 'lhereby rack and hollows are produced on the bodies. and the gaps between the adjacent \eiu'crs can be seen through the varnish.

The object f the iiu no\'e|ncnts is to proid a method in which the use of canvas as a oating is dispen ed with. For this puro e the outer veneers are not. so disposed r latively to each other as to abut. against- ":o'li other with their ends. but so as to o\ erlap each other, and the veneers are connet-ted with each other with a water proof 1.:lue and under such pressure, that the overla ping ends of the veneers are in part pressed into each other. When afterward L'l'llttllllfl the outer parts of the complete body no gaps whatever are visible. Such gaps can be observed. if at all. only by a light change in the direction of the grain of the wood. 'l'herefore the varnish can be dire tly applied to the veneer without using a coating of canvas. and no uneven parts or cracks appear on the joints. The number f the veneers used is ditl'erent according to \arious conditions. Good results are obtained with three or five wood veneers of a thickness of one millimeter each. Where gsneh bodies are made convert the outer ve- :necr must necessarily gap at certain parts. .-\t such places patch veneers can easilv be used which are so cut according to the shape of the said portions. that their margins underlie the nnirgins of such gaps. By gluing under pressure the parts of the wood .are almost entirely forced intoeach other, iso that a gap can not be seen even at such places. The overlapping margins of the veneers must not be tapered. but they must be used in their full thickness.

For the purpose of explaining the invention more in detail an example embodying =-the same has been shown in the accompanying drawing in which the same letters of reference have been used in all the views to indicate corresponding parts.

ln said drawingsz-I igure 1 is a perspective view of the corner of the hodv of an automobile which is curved in all directions so as to make a comfortable seat. back and arm support. and Fig. 2 is a sectional top view taken on the line 2-42 of Fig. 1 and Fig. 3 is an enlarged cross-section of the joint of the body shown in Figs. 1 and 2. j Referring more. particularly to Fig. 1 the ihne a.-a. may be supposed to be located in lthe plane of the drawing. To the portion of ithe veneer indicated by the said line a cen- .tral portion of the carriage hodv is conneetech As shown the body consists of a plurality of wood veneers. In the detail view of Ifig. 3 live layers are shown which number gives good results. While the inner veneers abut each other with their edges c,

175 SP-43 Z r, and I", the margins of the outer layers e and 1- overlap with their margin the adjacent layers. Al I l have shown in what manner the. margins are. laid above ach other. before gluing the same under pressure, and at e l have sh wn the shape of the overlapping ends after applying presisure thereto. liy this pressure. the hard portions of the fibrovnseulnr bundles of one section are embedded within the soft portions formed between the eorres mnding hard portions of the other veneer section and vice versa. in this way a homogeneous mutually countersunk structure is formed at the joint of the veneer sections. so that after the completion of the subsequent grinding and polishing operations. no gap will show at said joint. while at the same time the strength of the jointed veneers is considerably increased.

Fig. 1 shows by way of example in what manner the improved method may be used in the manufacture of such bodies. .\s will readily be understood. by having the. body curved in every direction the veneers must necessarily be split when forcing the same into a convex form. The line 11-41 indicates in a diagrauunatieal way. that the said split portion must be filled up by means of a plurality of patches. Of course. by grimling the surface of the joint the said line disappcars. Similar conditions are indicated I at the portion e of the body. But in this I case the veneer does not form a gap, but as the adjacent portions of the veneer are I curved toward each other, the veneer mustbe split, and the margins must be so arranged as to overlap each other, as is shown. Win the said figure. Also portions of thisv character are made invisible by the method;

described. The letter f illustrates an example in which two veneers are jointed tot each other. 5 I claim: i Method of forming a spheroidal wooden body which consists in arranging a plu-t l rality of veneers into superposed layers gluing said veneers, abutting the veneers 0ft each of the inner layers, overlapping the un-t a reduced edges of the veneers of the outer,- layers, and applying pressure to said over-Q lapped edges, said pressure being of such; a strength as to mutually countersink saidj edges into each other whereby the surface; fibers of one of said edges are forced between the contiguous surface fibersof the; other edge.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

' CARL TONJEs.

Witnesses:

Faunamou Horaammu, Fnanmme Rlnou.

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