US839596A - Pulley. - Google Patents

Description

PATENTED DEC. 25, 1906.

A. JOHNSTON.

PULLEY. APPLICATION FILED SEPT. 7.1904.

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,0 wheel I ma "-next step W i TED STATES PATENT OFFICE.

ALLEN JOHNSTON. OF OTTUMWA, IOWA.

PULLEY.

- 5 tion is ful y set forth in the following specification.

I This invention relates to improvements in ball-bearing wheels, pulleys, or rollers for sheaves, sash-pulleys, doorhangers, and Her'etofore' such wheels or rollers, when formed of sheet metal, have commonly been made of two disk-like parts or halves secured together by rivets or otherwise. When subjected to-heavy ressure or I 5 strains, the parts frequently brea apart.

My object is to overcome this difliculty and to provide ball-bearing wheels or rollers' of minimum cost and maximum strength and durability; also, to provide for maximum 20 ball-bearing surface relative to the diameter of the wheel 'or roller.

The invention may be readily understood by reference to the accompanying drawings, 'wherein 'Fi es 1 and 5 illustrate blanks from whic parts of the 'wheel may be formed. Figs. 2, 3, and 4 illustrate different steps in the formation of the rim of the wheel. Figs.

6, 7, and 8 illustrate steps in the formation of 30 the inner ball-retaining ring .of the wheel.

Fig. 9 is a sectional view, and Fig. 10 a side elevation, showing 'the parts secured toether to forms. com leted wheel. is an elevation, and Fig. -12 a'sectional view,

3 5 of a sheave or pulley in which the wheel shown in Fig. 9 1s used. Fig.-15 shows the rim and ring in relative position before they are secured together" In forming the outer grooved rim of the start either with the flat sheetmetal blan. 15 or with the short tubular blank 16. ifhen blank i5 is utilized, it is first drawn or shaped into the form of a cup, Fi 2, having a bottom 17 and a flared open forming a peripheral flange 18., By the of the process the bottom 17 is out or otherwise removed, as shown stamped in Fig. 3, leaving aslightly-mturned annular Specification of Letters Patent. Application filed September 7, 1904- Serial No. 223,647-

Patented Dec. 25, 1906.

18 and 20, separated in a peripheral groove 22, in whicha sash-cor ,track, or other coop-' erating part is adapted to engage. As shown, therim 1s webless and spokelessi. e., there. is no portion or spokes extending inwardly from its inner convex surface. Fewer steps are required to form this rim from the tubular blank 16 One or two forming steps suffice to turnupthe'flanges 18 and 20 at opposite ends of the short length oft-ubing. The inner trough-like ring for engaging the bearingballs may be formed either from the circular sheet-metal blank or the short tubular blank 26, Fig. 5. When the former is utilized, it is first drawn or shaped to .form the cup of Fig. 6, having bottom 27. The edge of the'cup is then turned inward to form a an 'e 28, Fig. 7 Bottom 27 is then removed and inturned flange 29 (similar to 28) formed. These operations result in the continuous seamless annulus or ring formed of a single iece of metal and having inturnedball retaimng and en aging flanges 28 and 29.

The rm 30, (shown in Fig. 8,) is next inserted in t e rim of Fig. 4, in which it closely fits, as shown in Fig. .15. The ring is now spread or ex anded, particularly at its edges, until its wal assumes a sha e corresponding to the inward convexity of t e rim, as clearly shown in Fig. 9. Peripheral ribs and 41 are thus formed. They are of greater diameter than the smallest diameter of-the rim,

and hence bind the rim and inner ring together. In this manner the two parts of the wheel are rigidly and securely fastened to-. gether without the use of rivets or solder.

older, rivets, or other means of securing these (parts together may, however, be em-r plolye a he sheave or ulley shown in Figs. 1 1 and 12comprises aw eel:such as shown in Fig. 9, andtwo plates 32 and 33, rigi ly connected by a bentfover flange 34 and so shaped as to provide a grooved annular ball-raceway 35. too

36.represents'bearing-balls o crating 'in'said racewa 35 and in thetroug -like innenring 30 of t e wheel. The flanges .28 andflli) of said ring hold the wheel in proper operative flange 16.; The article of Fig. 3 is then fur 5c ther drawn, sws 'ed, or shaped. to turn the, flange outward? ,forming a second peripheral flange 20%;simi ar to flange 18, said flan es bei connectedby aficoncave wall 21'. 'lhe 're'su t of these operations is a continuous- 5 5 annular seamless rim formed of a single piece of metal and having sideguide-flanges' rim and its flanges being strain upon the wheel, many more balls can 7. A wheel or pulley havin a periphe be employed, with corresponding increase in rally grooved rim, a ring fitting c osely Wlthin bearing-surface, the more durable and smoothness of 0 eration, and a smaller wheel can be employed for heavier work.

Modifications may of course be made within wide limits without departing from. the nature and principle of the invention.

at I claim is v 1. In a wheel or pulley, a continuous'webless seamless rim having ing integral flanges at its opposite ed es in combination with an inner ring fitting c osely peripheral ribs engaging on Within said rim.

2. In a Wheel or pulley, less seamless rim having ing integral flanges atits a continuous webopposite edges, said formed of a single piece of sheet metal, in combination with an inner .continuous seamless ring fitting. closely Within said rim.

3. A Wheel or pulle having a continuous seamless rim providecl with outwardly-projecting integral flan es at its opposite edges, and an inner rin 'tting closely within the rim and provide with inward y-projectingi integral flanges at its opposite edges.

4. A Wheel or pulley havinga continuous seamless rim provided with outwardlyr0 jecting integral'flanges at its opposite e ges, and an inner continuous seamless ring fitting closely within the rim and provided with inwardly-projecting integral flanges at its opposite edges.

5. A Wheel or pulley having a continuous seamless rim provided with outwardly-projecting integral flanges at its opposite edges, said 'rim and its flanges being formed of a sins gle piece of sheetmetal and an inner continuous seamless ring fitting closely and secured within the rim and provided with inwardlyprojecting integral flanges at its 0 posite edges, said ring and its flanges being ibrmed ofa single piece of sheet metal.

6.- A wheel or pulley. having a rim, and a ring fittin within the rim and provided with periphera ribs engaging on opposite sides of a portion of the rim of smaller diameter than the ribs, whereby the rim and ring are held together.

pulley is much stronger, lasting, there is greater Ling flanges around opposite'edges of the ring l and peripheral. ribs 1 tinuous seam ess outWardly-projectl and provided outwardlyproject: I

the rim and provided with inwardlyeprojectengagin sides of a portion'of the rim'o eter than the ribs, are held together.

on opposite smaller diam- 8. A wheel'or pulley having a continuous grooved rim, a confitting within the rim seamless. peri 'herally ring with inwardlfy projectin flanges around opposite edges t a portion of the rim of smaller diameter than the ribs, whereby the rim and ring are hfeld together. .9. Awheel orpulley having a continuous seamless periphera ly-grooved rim made of a single piece of metal, a continuous seamless ring made of a single iece of metal and fit-' ting within the rim an having inwardly pro- 'jecting flanges around its opposite edges and peripheral ribs engaging on opposite sides of a portion of the rim of smaller diameter than the ribs,'whereby the rim and ring are held together, said flanges and ribs being integral parts of the ring.

10. A Wheel or pulley having a continuous seamless -r1m made ofa single piece of metal,

whereby the rim and ring he rin "an opposite s'i eso'f a continuous seamless ring comprising in- I wardly-projecting side flanges connectedby a concave Wall closely engaging an inwardly.-

'conveX wall of the rim, thereby securing the 8 rim and ring to ether. i

11. The com ination with a wheel having a continuous seamless rim secured withinthe rim and formed with integral inwardly-bent ball retaining and guiding flanges'at its opposite edges, of a gang of bearing-balls engaging the inner surface of the rin. for sai balls. v

' In testimony whereof I have signed this specification in the presence of two subscrib'- ing witnesses. l

' Witnesses:

I and a concentric: continuous seamless ring fitting closely and v between said flanges, .anda support 9s ALLEN JOHNS-TON;

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