US770398A - Joint-fastener - Google Patents

Description

No. 770,898. PATENTED SEPT. 20, 1904. P, W. STARR.

' JOINT FASTBNER.

APPLIOATION FILED 00125, 1903.

NO MODEL.

UNITED STATES Patented September 20, 1904.

PATENT OFFICE.

JOINT-FASTENER.

SPECIFICATION forming part of Letters Patent No. 770,398, dated September 20, 1904.

A li ti fil d October 5,1903. Serial No. 175,738. (No model.)

To all whom, it natty concern.-

Be it known that I, FERDINAND W. STARR, a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio. have invented certain new and useful Improvements in J oint-Fasteners, of which the following is a specification.

The object of my invention is to produce a mechanical joint for woodwork which can be easily applied without any damage to the material and which will be powerful and durable.

Another object of my invention is to produce a mechanical joint of two abutting sections without mortises and tenons.

Another object of my invention is to provide a fastening-brace form of thin metal having a central recess which serves as a brace to strengthen the metal and in which the heads of the anchoring-fasteners may rest below the surface of the fastener.

Another object of my invention is to produce a stronger joint than by the ordinary mortises and tenons.

Another object of my invention is to provide a countersunk metallic joint-fastener as a new article of manufacture.

The features of my invention are more fully set forth in the description of the accompanying drawings, forming a part of the specification, in which- Figure 1 is a plan view of one form of joint. Fig. 2 is a section on line 0 a, Fig. 1. Fig. 3 is a detail plan view of the brace unattached. Fig. 4 is a plan view of a miter-joint. Fig. 5 is a perspective view of an angle-joint. Fig. 6 is a partial sectional view transversely of Fig. 5.

A A represent the meeting sections of wood to be joined.

B represents the metallic fastening-brace, provided with a depression 6, having holes a a, through which pass the fastening devices, specifically shown as screws of the ordinary form. In aplain joint, as is shown in Fig. 1, a plain brace, as is shown in Fig. 3, is used. It is countersunk across the meeting sections of the wood substantially flush with the surface. The screws pass through the orifices at an angle relative to the line of the joint, as

without undue strain upon the metal.

shown in Fig. 2. With the kind of joints shown in Figs. A and 5 plain metallic strips are employed provided with one or more concave depressions b 6 practically identical with the individual brace shown in Fig. 3. In the joint shown in Figs. 5 and 6 the concave depression of the plate is not countersunk into the joint-sections, but is placed snugly in the joint, with the edges 0 c of the brace and the orifices a a, bearing against the sides of the meeting sections of wood. A strain imparted to this joint in any direction will be efiectually counterbraced by this device, and the joint is almost if not quite as durable as an integral structure. These joints can be made and sold as a staple article of manufacture. They do not have to be especially fitted to each job. These concave or countersunk braces not only stiffen the metal and strengthen the joint, but they receive the heads of the fastening devices below the surface of the wood. Preferably the screws are inclined to an angle of forty-five degrees relative to the line of the joint, it being obvious that in this position they are disposed to sustain equal strains upon any side ofv the joint.

In the preferred form of construction the fastening -piece has a concave depression. This concave or conical form of fastening is by far the best form, first, because the metal can be spun or stamped in the shape The metal is strengthened in cross-section and serves as a brace to the joint. Second, this form of construction is preferable where the concave or conical depression of the metallic fastening-plate is to be countersunk into the abutting joint-sections, as the ordinary counter-sinking tool making a circular recess may be employed and the joints more rapidly made.

This form of fastening contains many forms of advantages, especially where joints are to be made of sections of soft or brashy timber, when such joints are made of mortises and tenons very materially weak in structure, whereas the use of my fastener not only makes a stronger joint, but the joint-sections are not materially weakened.

It will be observed that the depressions formed in the metal joint-fastener perform two important oflices: First, to strengthen the fastening plate in cross-sections, so that a thin piece of metal may be employed and yet obtain strength to transverse strains. The depressions of corrugated like formation increase the tension strength of the joint-fastener many many fold. Second, such fastening-pieces are adapted to be used in kneejoints, right-angle joints, and butt-joints. The conical or concave form of depression is preferred, because it is so much easier applied than other forms.

I do not wish to limit myself to the use of my fastening device to uniting sections of wood.

Having described my invention, 1 claim 1. A joint composed of two abutting sections, a metal fastening-plate having a concave depression formed in the plate with marginal flanges around the depression, orifices pierced in opposite sides of the depression, through which pass diverging fasteningscrews, which are driven into the abutting joint-fastening sections, substantially as described.

2. A combined brace and joint-fastener, formed of abutting joint-sections and a metal plate having concave depressions countersunk into the joint-sections, anchor-holes being pierced in diametrical opposite sides within the concave depression, and anchoring devices inserted through said holes and into the abutting joint-sections, substantially as described.

3. A non-tenon joint formed of two abutting joint-sections, secured together by a metallic joint-fastener plate, having a concave depression formed centrally in said plate and a marginal flange around the depression, orifices pierced in the sides of said depression, anchoring-screws inserted through said orifices, and diagonally into the opposite jointsection, substantially as described.

L. A joint composed of two abutting sections, a metal fastening-plate having two concave depressions formed in the plate with marginal flanges around said depressions, a countersunk hole in each of the abutting sections in which the said concave depressions lit and rest, and anchoring devices inserted through and within the concave depression into the abutting joint-sections, substantially as described.

5. A joint-fastener consisting of a metal plate having two or more countersunk annular depressions in the surface thereof provided with orifices adapted to receive fastening devices, substantially is described.

In testimony whereofl havehereunto set my hand.

FERDINAND W. STARR. \Vitnesses:

H. H. SCHMIDT, JAooB M. HARNER.

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