US1630521A - Furniture brace - Google Patents

Description

May 1927" s. G. BOLIN FURNITURE BRACE Filed March 7. 1925 11V VEN TOR Patented May 31, 1927.

P T-Eur orrice.

SVEN G. BOLIN, OF KANSAS CITY, MISSOURI.

. runmrunn BRAGE.

Application filed Hatch 7, 1925. Serial No. 13,863.

My invention relates to table braces and more particularly to a brace for clamping the legs of a table to the rails, the principal object of the invention being to provide a simple brace for rigidly holdingthe members of a table together and which may be applied with ordinary tools.

Iam aware of the fact that other braces have been devised for fastening the legs of a table to the rails, but in all of them it is necessary to provide special tools for groovbraces can be applied.

In the present construction l. have provided a brace having specially shaped and reinforced fingers or hooks which are adapted to en age in round holes in the rails such as would be made by the ordinary wood bit, in such a manner as to obtain the maximum strength from the wood rail and at the same time derive the. greatest rigidity from the joint when the parts are assembled.

With this and other objects in mind I have constructed the improved brace which willhereinafter be more fully described and illustrated in the accompanying drawings, wherein v Fig. 1, is a perspective view of the traming of mtable showing my improved braces in each of the four corners.

Fig. 2, is an enlarged detail of one corner of the framing with a brace inposition.

Fig. 3, is a perspective view of the brace.

Fig. 4, is a similar view of the opposite side of the same.

Fig. 5, is an enlarged plan section of the brace taken on the line 55 of Fig. 3, showing its relation to the rails and to the leg of a table.

Fig. 6, is a detail view showing the manner in which the hook engages the hole.

Fig. 7, is a diagrammatic view illustrating the points of engagement between the hook and the hole. I

Fig. 8, is a similar view developed into a' horizontal plane.

Referring more in detail to the parts 2- 1 designates the leg of a table and 2 and 3 adjacent side rails. Near each end of the rails are aired holes 4-4 and 5-5 which may be rilled with an ordinary wood bit to a depth of about half way through the rail, in order. not to mar the outer finish, and which are preferably spaced the same dising or mortising the rails or legs before the tance from the ends thereof. The ends of the rails are squared oil and adapted to abut the angularly disposed faces 6 and 7 of the leg 1 in such a manner that when the rails are finally clamped in'position the rail ends and leg surfaces fit closely together.

Extending between the adjacent ends of the rails is a brace 8 comprising a .rectangular sheet metal body 9, struck outwardly in the center to provide a trussed boss 10 having an aperture 11 throu h which a screw 12 may pass into the tab e leg 1. The screw I prefer to use consists of a wood screw 13 driven firmly into the table leg and a body 13 so threaded as to take the nut 14;, itbeing apparent that the screw remains in the leg and that the nut can be drawn tightly against the 'trussed boss without danger of rupturing the brace.

Folded laterally at opposite sides of the brace and at approximately right angles to the body 9 are longitudinal ribs 15 and 1 6 which further strengthen the body and which have angular ends 17 and 18 cut at an angle of 45 degrees to the body portion and 90 degrees to each other, so that when the brace is in position between the ends of the rails the angular ends abut the inner faces of the rails and tend to hold them at right angles to one another.

Struck from each end of the body portion 9 are hooks 19-49 and 20-20 which are bent at approximately right angles to the body and at degrees to the angular edges 17 and 18. The edges 21 and 22 of each hook are inclined toward the body of the brace so that the points of the hooks are narrower 4-4: and 5-5 at an angle of 45 degrees.

It is therefore apparent that the said hooks bear substantially uniformly on the walls of the holes. To illustrate this point clearly I have shown two diagrams in Figs. 7 and 8, the first showing a hook 19 entering a hole 4 which, by way of illustration, is indicated by single lines as a cylinder; thesecond figure showing the line of contact developed into a flat plane.

It is a geometrical principle that a plane cutting a cylinder at an angle to the axis produces an elliptical curve. Therefore if a plane is passed through the cylindrical hole at an angle of degrees, as for example at the point where the finger lies, an elliptical curve 26 will be formed, with the least curved portions lying adjacent the tapered edges 21 and, 22 of the fingers. However the edges 21 and 22 are each straight, therefor the extreme points of said edges will cut into the wood at both ends as clearly shown in the diagrams, thus forming a practical and effective grip that lends torsional qualities to the system of parts.

In applying the brace, the legs and rails are prepared as heretofore described, with the screw 12 in the proper position in the leg. The rails are then held up to the leg and the brace applied by slipping the screw 12 through the hole 11 in the brace and the hooks 19-19 and 20-20" into the holes 44 and 55. The nut 14 is then screwed in position and drawn down tightly against the trussed boss 10 with a wrench. The

tightening action thus accomplished, causes ward the ra1ls,-therefor it is apparent that as the brace is drawn tighter, and the friction between the ends of the rails and the angular surfaces 6 and 7 of the leg increases,

that the hooks 1919' and 20-20 will be driven ti htly into position within the-holes 4-4 an 5-5, and that the angular edges 17 and 18 will be drawn snugly against the inner faces of the rails and with the hooks give great torsional strength to the joint.

When the nut 14 has been tightened, each of the spherical shaped reinforcement ribs 24 are given a firm blow with a hammer thus insuring a perfect seat of the fingers within the holes as well as the angular ends 17 and 18 against the face of the rails, after which the nut 14 is given a final turn to complete the joint.

Having thus described my invention, What I claim as new therein and desire to secure by Letters Patent is 1. In furniture construction, the combination with a leg and a pair of angularly related rails abutting said leg, the rails having cylindrical holes formed laterall therein, of a brace having a body portion isposed between said rails, hooks on said body portion positioned within said holes, said hooks having converging lateral edges engaging opposite side walls of said cylindrical holes in angular relation to the axes thereof, and securing means efi'ective to draw said brace toward said leg.

2. A furniture brace having, in combination, a body portion, and oppositely disposed angular hooks on said body portion, said hooks being formed with converging lateral edges adapted to engage the side wall of a cylindrical hole inangular relation to the axis of said hole, and having reinforcing ribs extending along said hooks and into the adjacent portion of said body.

3. A furniture brace having, in combination, a body portion, and oppositely disposed angular hooks on said ody portion, said hooks being formed with lateral edges adapted to engage the side wall of a cylindrical hole in angular relation to the axis of said hole, said edges converging toward the point of the hooks.

SVEN G. BOLIN.

Images