US1919702A - Flush door - Google Patents

Description

July 25, 1933. w. P. MURPHY FLUSH DOOR Filed May 6, 1951 2 Sheets-Sheet 1 awe/whoa WAL TEFRMI/fiP/ Y y 5, 93 w. P. MURPHY 1,919,702

' FLUSH DOOR Filgd May 6. 1931 2 Sheets-Sheet 2 xxx 27% WALTER RMl/RPH y gwoenkw Patented July 25, 1 933 I UHTEF s'rArss ME I WALTERLP. MURP Y, on ,RIDGWAY, PnNNsYnvANrA, AssmNon To HYDE-MURPHY, COMPA Y, or RIDGWAY, PENNSYLVANIA, A conronerionorPENNsYLvANrA FLUSH noon j Application filed May .6, 1931. Serial Nb; 535,509.

This invention relates to flush doors and has for its object the production of a simple and efiicient 3 moisture control expansion joint foriuseinthe construction of flush doors, partitions, or 'othenforms ofwood' v working whereby the structure embodying this moisture control expansion joint willnot warp and-get out of'shape. e Another-ob ect of thisj'invention' is the production of a-fiush door partition, orother form of'wood working having acore consistingof alternate. fixed and unattached cross-rails which have a possible expansive action within nor along the longitudinal stiles and within and alongthe same plane as the veneer surface which covers the core and at the same time will not expand laterally agains't'tlie plane of the veneer.

inventionconsists of certain novel constructions, combination and arrangement of parts as will be 1 hereinafter "fully described and claimed:' '1 r I In the'd-rawings':

Figure 1- is a plan view of aflush door construction partly broken away to show the various layersgoing to make up the door,

a portion of the core structure being shown in section; 1

Figure 2 is-an edge elevation of the door shown in Figure 1, certain parts thereof being' broken away and shown in section;

I Figure 3' is a section taken on line 33 of Figurel;

Figure 4 is a section taken online 4;l of Figure 1;- n

Figure 5 is a'detail perspective view of a portion of the core stiles, and a fragmentary perspective view of the cross rails showing the structure of the expansion joint;

[Figure 6'15 a transverse sectional view through a modified form of the expansion joint;'and r Figure 7 is a perspective view partly shown in sectionshowing the structure 01- the modified form of the expansion joint also illustrated inFigure 6. v 1

By referring to the drawings, it will be seen that '1 designates the core stiles of a flush--door, each of the stiles being provided With these and other objects in view .thiswith vertically extending channel or tiedto or secured firmly to the core stiles 1' by means of dowel pins 5 which enter transversely and tightly into the core stiles 1 andiinto suitable dowel pockets 6 formed in the cross rails 4 as shown clearly in Figure 5 of the drawings. o

In building the flush door, it ispreferable o to anchor the cross "rails 4 to the core stiles 1 by means of the dowel pins 5 as shown clearly in Figures land 8' of the drawings, alternatin with a floating or unsecured cross rail mounted between the fixecl cross rails 4, these cross rails 7 having suitable tongues fitting within the grooves or channels 2 formed in thecore stiles 1, and in this 7 way permitting a slight expansive move ment longitudinally within the channels or grooves 2. This arrangement of'fixed cross rail 4, unsecured cross rail'7, fixed-cross rail 4- and unsecured cross rail 7 is continued throughout the length of the door with the widths of the cross rails 7 being so arranged that there are fixed cross rails 4; at the top and bottom edges of the door core.

'Abutting the anchored or secured cross rails 4 between them and cross rails 7 there is provided a specially constructed expansion joint which consists of a pair-ofabutting sec tions which are referred to for convenience as amale'section 8 and a female sect1on'9.

in the fem'ale section 9 attached to cross rails 4, The abutting faces of the'male and female sections 8 and 9 of the expansion joint are dished inwardly from the outer side edges of the sections or" the joint therebyproducing inwardly inclined walls 12 which walls incline from the outer side edges of the male and female'sectionstoward the, tongue or groove formed in the respective sections.

romthe description andby carefully each section to permit a proper expansion and contraction of the male and female sections of the expansion joint. The tongue 10 of the male section is only of sufficient depth to fit within the channel or groove 11 of the female section and permit proper expansion and contraction without contact with the inner face of the channel formed within the female section.

In building the structure embodying the flush door, or other woodworking structures, it is preferable to provide an expansion joint at each edge where anchored and unsecured cross'rails abut and as they alternate, there would be an expansion joint between all cross rails. However, the expansion joint may be placed at any point, extending from stile to stile. The preferable arrangement of cross rails is to alternate fixed and unsecured rails but theymay be arranged in any combination or series as desired.

It is a well known fact that the physical properties of wood will cause the wood to absorb water when in contact therewith, and it is further a well known fact that wood will absorb moisture from the air as and when the humidity percentage increases and conversely wood will give oif moisture as and when humidity percentage decreases. It is a further recognized fact that in the law of physics, wood increases in width when absorbing moisture and decreases in width when drying out or giving 01f moisture. The particular expansion joint which has been provided produces an open space into which the core following the line of least resistance may expand when and as it absorbs moisture without causing any variation of the outside dimension of the woodwork within which the joint is used such as the flush door illustrated. Furthermore, the particular structrue which has been illustrated and described will provide for a'uniform distribution of the expansion and contraction, the stresses and strains due to unequal absorption, and uncontrolled swelling and stralnmg, and stresses and strains which are the primary cause of warping and twisting will be prevented or so minimized in effect as to produce an efficient article which is practically free from the tendencies and faults of warpage or twistin The door or other article provided with the expansion joint described will remain straight under adverse conditions.

It should be further understood that the present invention provides for the anchor ing of a series of cross rails upon the core stiles and also provides for controlling the expansion of all the cross rails through the medium of an expansion joint between any or all of the cross rails, the cross rails which are interposed alternately between the secured or anchored cross rails being unglued, undoweled, and in no way secured against longitudinal movement within the groove of the core stiles, thereby producing semi-movable or expansive cross rails having possible slight floating or sliding action within or along the grooves of the stiles in which the tongues of the cross rails fit. This slight movement will assist in the proper expansion under the action of moisture, longitudinally of the stiles.

In Figures 6 and 7 there is shown a modified form of invention, wherein the expansion joint comprises a pair of similarly con structed panel sections 18, having registering longitudinally extending grooves 1 upon their adjoining faces in which is adapted to fit a spline 15 extending longitudinally of the sections 13. The adjacent faces of the sections 13 are inclined from the outer side edges of the sections toward the grooves or channels 14: as illustrated clearly in Figures 6 and 7 to provide inclined faces 16. The spline 15 is preferably of a suitable size to permit movement of the sections 13 relative to each other without jamming the spline 15 against the inner face of the channels or grooves :14.

Vithin the scope of the invention, the flush door illustrated may be provided with suitable panels or openings for glass, and a covering or casing for the core other than veneer or in addition to the veneer may be employed should it be so desired.

Itshould be understood that certain detail changes may be made in the mechanical construction without departing from the spirit of the invention so long as these changes fall within the appended claims and it is further desired to point out that the present device may be applied to other articles other than flush doors, partitions, and similar woodworking structures.

- Furthermore, it should be understood that the principal feature of the present invention relates to the core construction of the door, partition, or other suitable woodworking structure, and in constructing a door the core is assembled as above described and illustrated, upon which a flush veneer, called the face veneer, may be placed. If it is desired, two veneers, the under one termed the cross banding as indicated by the numeral 17, may be employed, and over this may be placed the outer veneer 18.

Having described the invention,what is claimed as new is:

1. A structure of the class described comprising a core embodying side core stiles,

spaced cross rails anchored to said side core stiles, unanchored intermediate cross rails engaging said side core stiles arranged between StLlClRDCllOlGCl cross rails, and an expansion joint interposed between and forming part of said anchored and said unanchored cross rails.

2. A core for woodworking structures oomprising side core stiles, cross rails anchored in spaced relation upon said core stiles, unanchored cross rails interposed between said anchored cross rails, said side core stiles provided with longitudinal channels, said cross rails provided with tongues'fitting in said channels, and an expansion joint interposed between the anchored and unanchored cross rails.

3. A core for Woodworking structures comprising side core stiles, anchored cross rails, unanchored cross rails expansive longitudinally of said side core stiles interposed between said anchored cross rails, and an expansion joint compensating for the relative expansion of the cross rails with respect to anchored cross rails under the influence of moisture. a

4:. A nonqvarping flush door construction comprising side'core stiles, core cross rails fixed to said sidecore stiles, said side core stiles provided with longitudinally extending grooves, a series of free core cross rails having tongues fitting insaid grooves interposed between said fixed core cross rails, an expansion joint interposed between said fixed and free rails, and a covering for said door. c

5. A non-warping flush door construction comprising side core stiles, spaced anchored cross stiles, free core cross rails interposed between the anchored cross stiles, an expansion joint interposed between said anchored cross stiles and free rails, said'expansion joint comprising a pair'of companion sections having their adjoining faces inclined from the outer side edges toward the center thereof, andwith the outer side edgescoming flush together so as toprovide a continuous unbroken surface for the application of veneers or other covering.

6. A non-warping flush door construction comprising s1de core stiles, spaced anchoredcross stiles, free core cross rails interposed betweenthe anchored cross stiles, an expansion joint interposed between said anchored cross stiles and free rails, said expansion joint comprising a pair of companion sections each having a dished-out portion formed upon the adjoining faces thereof.

7. A non-warping flushdoor construction 7 comprising side core stiles, spaced anchored cross stiles, free core. cross rails interposed between the anchored cross stiles, an expansion joint interposed between said anchored cross stiles and free rails, said ,expansion oint comprising a pair of companion sections, one section having a longitudinally extending tongue, the groove of one section being adapted to receive the tongue of the other section, said sectionsv abutting along their longitudinal edges, and

the adjacent faces of said sections being inclined from the side edgesthereof toward the center to permit the sections to expand and contract relative toeach other as the humidity increases or diminishes. c

8. A non-warping flush door construction comprising side core stiles, cross rails an; chored in cross relation upon said core stiles, unanchored cross rails interposed between said anchored cross rails, an expansion joint interposed between the anchored and unanchored cross rails, said expansion joint com-1 prising a pair of companion sections each having a dished-out portion formed ,upon the adjoining faces thereof, said adjoining faces also having longitudinally extending grooves, a spline fitted in said grooves and having expansion movement tllGIGlIlfor an- 7 clioring the sections of the expansion oint in assembled relation.

WALTER P. MURPHY.

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