US1257388A - Riveted seam. - Google Patents

Description

G. B. PHILLIPS.

RIVETED SEAM.

APPLICATION FILED NOV. 11. 1916.

1,257,388. Patente Feb.26,1918.

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Specification of Letters Patent.

iatented Feb. 26, 1918.

Application filed November 11, 1916. Serial No. 130,746.

To all whom it may concern Be it known that I, GEORGE B. PHILLIPS, a citizen of the United States, and a resident of Lima, in the county of Allen and State of Ohio, have invented certain new and useful Improvements in Riveted Seams, of which the following is a specification.

My invention relates to riveted seanis which are particularly useful in the construction of shells for boilers or other cylindrical vessels or structures subject to tensile strain.

In the ordinary lap joint heretofore used the straight overlapping plate ends are riveted together by rows of rivets parallel with the plate ends and at right angles to the direction of tensile strain. Owing to the rivet holes the seam is very much weakened and the efficiency in very low. Attempts have been made to increase the eihciency by applying straight inner and outer butt straps or liners over the abutting ends of the plates but also in this construction the cificiency is very low. Vauclain in his Patent No. 701,777, June 3, 1902, shows improved arrangement which produces a joint having a very high eiiiciency but to do this he uses a large diamond shaped inner plate, and an outer covering strip and rivets this strip and the inner plate and the abutting ends of the boiler plates together by rivet rows parallel to the abuttin line, and he rivets the inner plates along their diagonal edges to the boiler plate bodies. This produces a joint which is weakened only by the rivet holes at the corners of the inner plates, but the seam requires extra metal in the form of the inner plate and the outer strip, and innumerable rivets.

In other prior structures devised to increase the e'fliciency the ends of boiler plates are out to toothed or Zigzag form and the plate ends overlapped with the diagonal sides of the teeth in parallelism and the overlapping sections riveted together by rivet rows parallel with the toothed sides. This form of scam likewise lacks in eiiiciency.

The object of my invention is to produce without the use of extra inner or outer plates and with a minimum number of rivets a seam which is weakened only to the extent of a single rivet hole and of very nearly one hundred per cent. eiiiciency, and I accomplish this by cutting away the corners of shell or boiler plates to leave diagonal edges which converge to each. other, and then overlapping the plate ends and riveting theinto the plate body by rivets in rows parallel to the diagonal edges to thus form a rectangular or diamond shaped seam, there being only one rivet at the apex of each overlapping end so that the section of the seam at such rivet will be weakened only by the hole for-the rivet, and at any line inside of this one rivet the loss in metal occasioned by the rivet holes will be more than compensated for by the shearing strength of the rivet or rivets outside of the line.

I have shown one form of my improved seam on the accompanying drawing, in which Figure 1 is a side elevational view of part of a boiler showing plate ends secured together by my improved seam to form the sections and the sections riveted together end to end in telescopic engagement.

Fig. 2 is an end view of the boiler, and

3 is an enlarged view showing the for iation of the seam.

In Fig. 1 the boiler sections B may each be formed by bending and seaming together the ends of a single plate or by seaming together several plates. If a single plate is used, as shown, its ends a and Z) have their corners cut away to leave the diagonal edges 0, (Z and e, f respectively, the edges coming together to apexes g and h at the central longitudinal line of the plate. The ends a and Z) are then overlapped and rigidly secured to the plate body by rows of rivets 2' running parallel with the diagonal edges, there being only one rivet j at the apex g and only one rivet 70 at the apex it, the resulting seam being of rectangular or diamond shape. To hold the plate ends in contact at the center of the earn and also to assist in strengthening the joint, rivets m may be provided, and if desired rivets a may be placed at intervals inside of and in staggered relation to the rivets 2'. After formation or" the boiler sections B by seaming plate ends together the sections are secured together end to end to form the boiler or other container, as indicated in Fig. 1.

With my improved seam 1 eflect a great saving of material as the plate ends are riveted directly together without the use of special inside or outside reinforcing plates. Furthermore, as all the material for the seam is carried in the plate there is a great saving of time and labor in handling. There is also considerable saving in amount of rivets used as no rivet passes through more than two thicknesses of plate. Furthermore, the seam is of maximum eficiency'as the plate can be weakened only by the loss of a single rivet hole. This in the ordinary boiler plate of four foot width would give a seam efiiciency of close to 99%. The weakest section of the seam would be at the lines passin through the apex rivets j and is. At any a other section within the apex rivets the loss in strength caused by the rivet holes would be more than compensated for by the shearing strength of the rivets outside of such section and therefore the efliciency at any section within the apex rivets would be greater than 100%, that is, the strength is greater than that of the plate outside of the scam.

In locomotive work it is often necessary to have an additional thickness of metal at some particular point in the circumference of the boiler and to accomplish this it has been the usual practice to apply a reinforcing plate or plates, but with my improved overlap joint, a joint can be so located that the double thickness will come where the extra material is required and thus a saving of boiler material and labor results.

I do not desire to be limited to the exact shape and arrangement of scam shown as changes and modifications are no doubt possible which would still come within the scope of the appended claims.

I claim as follows:

1. In a boiler section, a seam comprising plate ends extending full width of the section and having their outer corners cut away diagonally along straight lines and overlapped to form a diamond-shaped joint, and rivets passing through said ends and equally spaced along the straight diagonal edges whereby the distances between the transverse lines passing through opposite rivet holes will be equal to thereby prevent a fracture along one transverse line from including one or more rivet holes of an adjacent transverse line.

2. In a boiler section, a seam comprising overlapping plate ends extending full width of the section and having their corners cut away to leave diagonal convergent edges, and rivets applied through said ends along said diagonal edges, there being only one rivet at each apex of the converging edges and said rivet being sufliciently displaced from the transverse line passing through the next preceding rivets that a fracture line will not include the holes of such rivets and the hole of the apex rivet.

In witness whereof I hereunto subscribe my name this 8th day of November, A. D. 1916.

GEORGE B. PHILLIPS.

Copies of this patent may be obtained for five cents each, by addressing the (lc-mmissioner of ratents,

Washington, D. 0.

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