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Publication numberUS682321 A
Publication typeGrant
Publication dateSep 10, 1901
Filing dateSep 21, 1900
Priority dateSep 21, 1900
Publication numberUS 682321 A, US 682321A, US-A-682321, US682321 A, US682321A
InventorsFrederick J Cronin
Original AssigneeFrederick J Cronin
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 682321 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

No. 682,32l. Patented sept. m, |901. F. J.- conm.


(Application led Sept. 21, 1900.)



SPECIFICATION forming part of Letters Patent No. 682,321, dated September 10, 1901.

Application led September 21, 1900l Serial No. 30,701. (No model.)

T @ZZ whom, t may concern:

Beit known thatl, FREDERICK J. CRONIN, a citizen of the United States, residing at Utica, in the county of Oneida and State of New York,have invented new and useful Improvements in Doors, of which the following is a specification.

This invention relates to doors in which the body :is built up of strips or pieces of cheap or soft wood which are covered with a veneer ofl more expensive hard or soft wood.

The object of ,my invention is to cheapen the construction of such cored doors.

In the accompanying drawings, Figure l is a face View of a door constructed according to my invention. Fig. 2 is a face View of the same before the veneer is applied thereto, the two right-hand panels being omitted.

Fig. 3 is a transverse vertical section in line 3 3, Fig. 2. Fig. i is a horizontal section in line 4 4, Fig. 2, showing both of the upperpanels in 'the door. Fig. 5 is a similar section in line `5 `5, Fig. 2.

Iiike letters of reference refer to like parts in the several figures.

Each stile of the door is preferably built up of an outer or facing strip a, which extends from the top to the bottom of the door, and shorter inner strips a', arranged side by side and made of a thickness corresponding, preferably, to the width of the facing-strips a. The Stiles are preferably divided into upper and lower sections A A, which are arranged opposite the upper and lower door-panels B B', respectively. If desired, each strip o. may consist of a number of short pieces, as shown in the upper section of the right-hand stile. The ends of these stile-sections terminate at a distance from the upper and lower ends of the door and are stepped, as shown at c, or, in other words, the .strips a of each section successively extend beyond each other at both ends from the outermost toward the innermost of said strips.

D D are the top and bottom rails of the door, which are preferably built up of strips of uniform thickness similar to the stiles A A. The outermost or facing strips d d of these rails preferably extend continuously from one of the upright facing-strips a to the other, While the inner strips cl2 terminate at a distance from said upright facing-strips.

The ends of the short strips d2 of the upper rail are stepped, as shown at d3, the steps of this rail being preferably arranged in diag0- nal alinement with the adjacent steps c of the upper stile-sections A, as shown. The lower rail is somewhat deeper than the upper rail and its short strips are stepped. similar to those of the upper rail; but the ends of the inner strips of said lower rail are preferably stepped in the reverse direction to those of the outer strips, as. shown at d4.

E is the intermediate or lock rail, which is also composed of strips arranged side byside and which is preferably divided into two sections arranged on opposite sides of the vertical center line of the door. The ends of the strips of the lock'rail sections are stepped like those of the stilesections and the top and bottom rails, as shown.

F is the upper muntin, which is built up of i strips like the stiles and rails of the door and which is formed at its upper end with a tenon f, fitting into a mortise f', formed in the top rail, as shown. The lower ends of the strips which form the upper muntin terminate at a distance from the lock-rail and are stepped or constructed to extend one beyond the other, as shownatf'?.

G is the lower n1 untin, which is made up of strips like the upper muntin and is mortised at its lower end in the bottoni rail, as shown at g. The upper ends of the lower muntinstrips stop short of the lock-rail and are stepped similar to the upper muntin, as shown at g'.

By constructing the various frame mem-` bers of the door-body as hereinbef'ore described spaces are formed in the corners of the door, also between the opposing ends of the stile-sections A A and the outer ends of the lock-rail sections and also between the opposing inner ends of the muntins and the opposing inner ends of the lock-rail sections. These various spaces are filled by locking or connecting blocks h h, which are of the same thickness as the strips of the various frame members of the door, so that the strips and said filling-blocks are iiush on both sides of the core or door-body. These filling-blocks are stepped or shaped to conform to the stepped ends of the contiguous strips, so as to fit closely between the same, and are glued or otherwise secured at their edges to said strips, so as to form a lock or connection between the adjacent ends of the various frame members of the door. The corner-blocks h h3 5 and the side blocks h4 h5 at opposite ends of the lock-rail are formed to t the adjacent facing-strips d, d, and d of the stiles and the top and bottom rails and are glued or otherwise secured to said strips. 'Ihese filling- IO blocks may be cut or sawed from any cheap or inferior wood or other lightmateral, or they may be molded of any suitable composition. By forming or arranging the strips of the several frame members so as to present I5 stepped ends and constructing the contiguous edges of the lling-blocks correspondingly the strips are glued to the blocks along a portion of theirsides, as well as at their ends, thereby increasing the extent of the attachzo ing-surface and forming a correspondingly stronger joint. Vhile such stepped joints are preferably employed, the same result may be obtained, although in an inferior degree, by making the conti guous faces of the blocks 2 5 and strips straight or without steps. The core or door-body so formed is covered on each side with a-facing I of veneer, which is preferably applied in strips, as shown in Fig. l. These veneer-strips are glued to the faces 39 of the various strips forming the frame members. If desired, the strips may also be glued together at their sides, but this is ordinarily not'necessary, as the veneer-facings unite the strips sufciently to form a strong and rigid core.

The panels of the door may be secured in placein any well-known manner. In the preferred construction shown in Figs. 2 and L.tof the drawings the members of each panel- 4o frame are provided in their edges with grooves j, which receive projecting ribs j', between which the panel is centered or tted, and the panel is secured in place by molding-strips jg, which overlap and conceal the joint between the panel and said ribs.

Although I have shown my invention applied to a cored door-frame, it is obvious that the same is applicable to other cored woodwork of a similar character.

I claim as my invention- 5o l. A frame for doors and similar articles having adjacent frame members separated by intervening spaces and each member being constructed of strips which are arranged side by side and which project successively one beyond the other so as to produce a stepped end on the member, and filling or locking blocks arranged in said recesses and having correspondingly-stepped faces which are se; cured to the stepped ends of the frame mem- 6o bers, substantially as set forth.

2. A cored door having stiles composed of upper and lower sections each of which is built up of strips of uniform thickness ar` ranged side by side and having their ends stepped or arranged to project successively beyond each other, a lock-rail composed of similar strips having their outer ends stepped, and filling-blocks arranged in the spaces be tween the adjacent ends of the stile-sections 7e and the lock-rail and having its edges stepped to Iit the contiguous portions of said members, substantially as set forth.

3. A cored door having a lock-rail composed of sections arranged on opposite sides of the vertical center line of the door and each built up of strips of uniform thickness arranged side by side and having their ends stepped or arranged to project successively beyond each other, upper and lower muntins 8o composed of similar strips having stepped inner ends, and a filling or locking block arranged in the space between the opposing stepped ends of the muntins and the lockrail sections and having stepped edges conforming to the corresponding ends of said members, substantially as set forth.

Witness my hand this 8th day of August, 1900.



THEO. L. Porr, E. A. VOLK.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5439749 *Aug 18, 1994Aug 8, 1995Andersen CorporationComposite wood structure
US20110000167 *Jul 6, 2009Jan 6, 2011Dimke Robert GWood door core including osb layers and method
Cooperative ClassificationA47B13/083