Slide rule for selecting material for constructing bearing

Details Slide rule for selecting material for constructing bearing Slide rule for selecting material for constructing bearing

1987-03-09

1988-10-04

Fuller, B. R.

Registers

Calculators

Bar

235 70A, G06C 2700

Patent

active

047757795

ABSTRACT:
A slide rule for selecting bearing materials has a base plate, a fixed cursor having first, second and third portions spaced apart from one another and fixedly attached to the base plate, a first sliding ruler slidably mounted between the first and second portions of the fixed cursor, an indicator cursor having an indicator cursor line and fixed to the first sliding ruler, a second sliding ruler slidably mounted between the second and third portions of the fixed cursor, and a fixed ruler mounted on the opposite side to the second sliding ruler with the third portion of the fixed cursor interposed therebetween. The fixed cursor has a fixed cursor line in the vicinity of its left end. The first sliding ruler has logarithmic graduations which indicate levels of bearing surface pressure. The second sliding ruler has logarithmic graduations which indicate sliding speeds, PV values and periods of lifetime of various bearing materials. The fixed ruler has graduations which indicate bearing temperatures and on which correction factors in respect of bearing temperatures and information on various bearing materials are indicated. The slide rule is manipulated on the basis of given values of bearing surface pressure and sliding speed to provide information on a PV value of a bearing, a lifetime of a bearing material, regreasing time, danger limits, attention limits, safety limits and so forth.

REFERENCES:
patent: 3135465 (1964-06-01), Squier et al.
patent: 3690547 (1972-09-01), Eadon-Allen

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