US80948A - Improvement in loose pulley - Google Patents

Description

UNITED STATES PATENT QEEIcE.

DAVID HARRINGTON, OF VOROESTER, ASSIGNOR TO HIMSELF AND S. A.

' WOODS, OF BOSTON, MASSACHUSETTS.

I IMPROVEMENT IN LOOSE PULLEY.

Specification forming part of Letters Patent No. 50,911S, dated August ll, 1868.

To all whom it may concern:

Beit known that I, DAVID HARRINGTON,

of WVorcester, in the county of \Vorcester andw State of Massachusetts, have invented an Improved Loose Pulley 5 and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description of my invention sufficient to enable those skilled in the art to practice it.

My invention relates to the construction of loose pulleys with reference to provision for self-lubrication of the hub or bearing-surface thereof, and my improvements have particular reference to that class of loose pulleys in which a bushing is inserted.

My invention consists, primarily, in combining, with an oil-chamber made around the bushing, oil-passages leading through the bushing, and made narrow at the bearing-surface and flaring back to the chamber, these oil-passages being filled with wicking or other fibrous material, which, keeping saturated with oil, aords a continuous supply of lubricant to the shaft or journal, the oil-chamber and oil-passages being so constructed that the journal is kept free from excess of oil by centrifugal action when theV wheel Y is rotating,

while-at whatever point it stops some one or more of the oil-passages will be in position to cause the oil to be carried by capillary attraction to the shaft.

The drawing represents a loose pulley embodying my improvements.

A shows a central cross-section on the line a@ B shows a section on the line z z. C shows an outside view of the bushing.

a denotes the pulley, provided with a bushing, b, the bushing being fast in the hub, but there being formed in the hub and extending around the bushing a chamber, o, for holding the lubricant. Extending through this bushing, from the oil-chamber to the inner surface of the bushing, are oil-passages d e j', which may be long and parallel with the axis of the pulley, as seen at d, or diagonal, as seen at c, or maybe round, as shown at j'. But, however arranged in these respects, each passage is made small or narrow where it opens into the bearing-surface ofthe hub, but enlarges or ares back to the oil-chamber, as seen in the drawings, so that, though each passage opens freely for passage of oil from the chamber, it is sufficiently contracted to pervent too ready flow of the lubricant to the shaft. These passages, however, are -to be filled with wicking or other fibrous material, through which the oil penetrates, or by which the oil is taken up by capillary attraction and conveyed to the bearing-surface of the hub.

The outer surface of the oil-chamber c is made 11a-ring, or enlarges from the ends of the chamber toward the center, as seen at A, so that when the pulley is in rotation the oil, under centrifugal action, is thrown toward the center of the chamber-that is to say, to the parts ofthe chamber most remote from the axis of the pulley-and is thus kept from being thrown beyond the ends of the pulley. To still further retain the lubricant at or toward the center of the chamber, I stretch bridges g across the chamber, as seen at A and B, mal; ing openings h through them to allow the passage of the oil to the center, these bridges also serving as supports to the bushing. While the rotation of the pulley thus causes the excess of oil to bey thrown to the center of the chamber, whenever the pulley stops the lubricant iiows through the oil-passages which are lowermost, and is distributed along the lower side of the shaft, so that the whole surface is lubricated when the pulley again starts. To prevent the oil from going beyond the hub on the shaft, a leather ring or collar, t', may be drawn over the shaft, the outer edge of this rin g projecting into the chamber c, so that the oil, by centrifugal force, will be reconducted back into the chamber,'thc end opening h of the pulley being larger in diameter than the shaft. At one end of the pulley the hub is shown as closing down upon the bushing to coniine the oil within the chamber, and both ends may be closed in this way, or both may be open, and a leather collar, z', may be placed upon the shaft at each end, or at only one end.

By this construct-ion the shaft and hub are kept well and constantly lubricated with a small quantity of oil, and wit-hout liability of the oil ruiming endwise beyond the hub.

I claim- 1. In combination with the bushing b (and oil-passages leading through it) and the surrounding oil-chamber c, the enlargement of l 4. I also claim the collar vl, placed upon the such chamber from its ends toward its center, shaft and leading into chamber c, substau substantially as and for the purpose set forth. tizilly as shown and described.

2. I- also claim7 in combination With the enlarging chamber c, the bridges g, for keeping DAVID HARRINGTON. the loil toward the center ofthe chamber, substantially as shown and described. Vitnesses: A

3. I also claim the flaring oil-passages d e f, E. B. STODDARD, substantially as shown und described. H. lV. VHEELER.

Images