US576115A

US576115A - Sprocket-chain

Info

Publication number: US576115A
Authority: US
Publication date: 1897-02-02
Anticipated expiration: 1914-02-02

Description

UNITED STATES PATENT OFFICE.

JOSEPH O. HAUGER, OF SI-IEPHERDSTOWVN, WEST VIRGINIA.

SPROCKET-CHAIN.

SPECIFICATION forming part of Letters Patent N 0. 576,115, dated February 2, 1897.

R Application filed June 10, 1896. Serial No. 594,995. (No model.)

1'0 all whom it may COILC'BI'IL:

Be it known that I, JOSEPH O. HAUGER, a citizen of the United States of America, residing at Shepherdstown, in the county of J eiferson and State of West Virginia, have invented certain new and useful Improvements in Sprocket-Chains; and I do hereby declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Reference is made to the accompanying drawings, formingapart of this specification, in which- Figure 1 shows side views of my improved pivot formed in two pieces or parts, and Fig. 1 shows end views of the same. Fig. 2 is an elevation, partlyin section, of a portion of the sprocket-chain assembled, comprising two adjacent links. Fig. 3 is an inside View of the links A and D, showing the apertures, the outside link A and the pivots being removed. Fig. 4 illustrates a modification of the c0mpound pivot in end views of the elements, where the divisional surface is curved instead of plane.

Like letters of reference indicate like parts in the several figures.

A A are the side links.

0 is the wearing or contact portion of the pivot. O is the riveting portion of the same, andD is one of the intermediate or auxiliary links.

0 c are the apertures formed in the side links for the reception of the riveting portion 0 of the pivot.

d d are the apertures formed in the auxiliary link D for the reception of the entire pivot C 0'.

My invention relates to improvements in sprocket-chains, particularly that species of chain now extensively used on bicycles and similar vehicles propelled by human power. These chains are subjected to great strain and wear by reason of the severe usage to which they are subjected, and being required to be of extreme lightness they must necessarily be made in the most perfect manner consistent with reasonable cost. The parts most exposed to wear are the auxiliary links D, both where they encounter the sprocketwheels and in the parts which turn on the fect cylinder.

pivots. The pivots also are liable to great friction and wear on the turning surfaces. Both the auxiliary links and the pivots accordingly have been made very hard on the wearing-surfaces to meet these demands, but a difficulty arises in the case of the pivots, which require to be riveted into the side links, but which riveting cannot be accomplished in an integral pivot after the whole has been hardened, the hardening process rendering the tenons brittle and incapable of being upset or headed down in the process of riveting. My improvement is designed to remedy this difficulty without material increase of cost. To this end I make the pivots in two partsO O, as illustrated in the several figures of the drawings. The part 0, which takes the wear, is made cylindrical on its exterior surface where the same encounters the surface of the link-aperture d and is made to fit the same. The part 0 is also made cylindrical on the portion of the surface which encounters the said link-aperture and also fits the same. The two parts O 0 when united on their divided surfaces form togethera per- The dividing-surfaces, which accuratelyfit each other, may be either plane or curved, and they need not exactly subdivide the cylinder of the pivot, it only being essential that they fit each other so that there shall be no rocking motion or other movement between the parts to create friction or lost motion, the whole friction and wear being designed to be on the outer or cylindrical surfaces, principally 011 that of the piece 0 p which is made hard for the purpose, either by case-hardening or by tempering, if the piece is of steel, or it may be made of any other suitable hard substance capable of enduring great frictional wear without injury,

such as phosphor-bronze, agate, jade,-&c.

The said part 0 is out of a length exactly to fit the intended space between the side links A A.

The part 0 is the rivet portion of the pivot. This is designed to hold the side links together and to take the strain, but is not intended to be subjected to a great amount of wear, being shielded by the pivot portion 0, which is placed on the inside for that purpose, where the greatest amount of wear occurs.

The rivet-pieces C are made of any material or metal suitable for rivets, as good-rolled, wrought, or drawn iron, untempered steel, hard-rolled or drawn brass, 850. They are preferably out from rods of the same of the requisite cross-sectional form, and are made long enough to reach the entire distance from outside to outside of the links A A when in place, with sufficient surplus to afford material for upsetting, heading-down, or riveting in the usual manner. The apertures c c in the sidelinks A A are made of cross-sectional form similar to that of the rivets, or of any desired form not circular, the non-circular form being relied on to obviate the tendency of the pivot to turn under the stress of friction.

I claim as my invention and desire to secure by Letters Patent- 1. A pivot or pintle for sprocket-chains formed in two parts, accurately fitted to each other on a longitudinal dividing-section, the external surfaces being cylindrical, one portion being hard on its cylindrical surface to resist wear, and the other portion being of softer material capable of being upset, headed or riveted, projecting beyond the former portion at both ends to form rivet ends, substantially as specified.

2. In a pivot for sprocket-chains, the combination of a semicylinder of hard material on its cylindrical surface, and a semicylin drical rivet of material capable of being upset, headed or riveted on its extremities, which project beyond the ends of the hardened portion a suitable distance for riveting when assembled in a chain, the said scmicylindrical portions when assembled forming an entire cylinder, completely filling the cylindrical aperture they are designed to occupy, all substantially as specified.

3. A sprocket-chain comprising side links A A, with non-circular perforations c c, auxiliary links D with hard wearing-surfaces, and pivots O C composed of two parts accurately fitted together on a longitudinal dividing-section, cylindrical on their external surfaces, one portion being hard on its cylindrical surface to resist wear, and the other portion being of softer material capable of being upset, headed or riveted, projecting beyond the former portion and secured in the side links A A to hold the parts firmly together, substantially as specified.

4. In a sprocket-chain, the combination of side links A A with non-circular perforations c c, auxiliary'links D with hard wearing-surfaces, semicylindrical pivot portions 0, hard upon their external surfaces, semicylindrical rivet portions 0 fitted to the said pivot portions on their flat surf aces, projecting beyond the latter to form rivet ends, said rivet ends securely fastened in the perforations of the side links AA to hold the parts securely together and prevent rotation, and located extern ally to the pivot portions With relation to the sprocket-tooth spaces, whereby the strain is borne by the said rivet portions, and the wear by the said pivot portions, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH C. HAUGER. "\Vitn esses:

CHAS. KRUGER, J OI-IN KRUGER.