Abstract:
The invention relates to a rim brake for a bicycle or the like and in which the brake lining can be moved via a pivotally mounted actuating member and a support member which carries the brake lining and is movable at right angles to the rim. The actuating member is rotatable about an axis which may coincide with the axis of displacement of the support member and is connected to the support member via a threaded control such that rotation of the actuating member in one direction imparts axial movement of the support member in a direction to apply the brake lining to the rim.
Abstract:
Substantially oil-free aqueous industrial fluids possess superior lubricating and wear preventing characteristics and are useful as hydraulic fluids and metalworking compositions. Fluids of the invention comprise (1) an aqueous liquid and (2) a water-soluble synthetic addition copolymer of (a) an ethylenically unsaturated crosslinking monomer, (b) an ethylenically unsaturated water-soluble monomer, and (c) an ethylenically unsaturated water-insoluble monomer.The industrial fluids exhibit good Newtonian behavior and mechanical stability at high shear.
Abstract:
A process for the production of an aqueous lubricant composition free of oil including water and at least one metallic carboxylate, wherein the anionic is at least one saturated linear organic radical containing at least 12 carbon atoms and the cationic is at least one bivalent or trivalent metal having an electro-chemical oxidation-reduction potential greater than -0.7 volts. The process includes mixing of two mother solutions. The first mother solution is an aqueous solution of at least one alkali metal carboxylate soluble in water wherein the anionic is at least one saturated linear organic radical with at least 12 carbon atoms. The second mother solution is an aqueous solution of at least one metallic salt whereof the anionic is selected from the group consisting of hydroxide, chloride, sulphate, nitrate or phosphate ions and whereof the cationic is at least one bivalent or trivalent metal having an electro-chemical oxidation reduction potential greater than -0.70 volts.
Abstract:
Lubricating oils containing at least one amino phenol of the general formula ##STR1## wherein R is a substantially saturated, hydrocarbon-based group of at least about 10 aliphatic carbon atoms, a, b and c are, for example, each 1, 2 or 3, and Ar is an aromatic moiety such as a benzene nucleus, naphthalene nucleus or linked benzene nuclei, are effective in lubricating two-cycle internal combustion engines. Typically such amino phenols for this use are formed by nitration and reduction of alkyl phenols having an alkyl or alkenyl group of at least about 50 carbon atoms.
Abstract:
In accordance with the instant invention, a water-based hydraulic fluid, having improved low foaming properties can be obtained by blending 2-ethylhexanol with a conventional water-based hydraulic fluid composition.
Abstract:
Corrosion of metal workpieces by water-based synthetic metalworking fluids is inhibited by a small but effective amount of a corrosion inhibitor consisting essentially of a molybdate compound and a compound selected from the group consisting of nitrites, borates, alkanolamines, amine borates, amine salts of unsaturated fatty acids, alkanolamine sarcosinates, alkanolamine phosphates, and alkali, morpholine, and alkanolamine salts of arylsulfonamido carboxylic acids.
Abstract:
The present invention relates to the use, as a hydraulic fluid or metalworking lubricant, of compositions having water as a base and yet possessing superior lubricating and wear preventing characteristics. The fluids of the invention comprise (1) a sulfurized molybdenum or antimony compound and (2) a phosphate ester or salt thereof. The compositions can be thickened, if desired, using for instance polyglycol, polyacrylic and polyvinyl alcohol-type thickeners. The use of corrosion inhibitors, metal deactivators and other adjuvants conventional in this art is also contemplated.
Abstract:
High molecular weight polyglycerol derivatives, useful as thickening agents for water-based lubricants, are prepared by oxyalkylating a polyglycerol with ethylene oxide or a mixture of ethylene oxide and propylene oxide. The polyglycerol derivatives are characterized as having an average of more than five glycerol units, and in having more than 95% and preferably more than 99% alkylene oxide units. These compounds exhibit excellent shear strength and provide an improved hydrolube when incorporated therein.
Abstract:
A fluidic fluid composition containing lamellar micelles and which exhibits retro-viscous properties at noncryogenic temperatures is composed of 7.00-7.35% of a surfactant (preferably petroleum sulfonate having an average equivalent weight of 350-525), 50.00-54.00% of liquid hydrocarbon, 24.80-28.00% of water and optionally up to 13.00-13.95% of a cosurfactant (preferably an alcohol containing 1-20 carbon atoms) and/or electrolyte (preferably inorganic salt). The micelles within the composition must have an axial ratio of at least 3.5. The composition is substantially optically clear, phase stable, birefrigent, and the flow properties are such that substantially large increases in flow rates, e.g. 20-fold, can be realized at very small pressure increases, e.g. 5%. Additional additives to impart desired properties can be included with the composition.
Abstract:
A composite material is described which will provide low friction surfaces for materials in rolling or sliding contact and is self-lubricating and oxidation resistant up to and in excess of about 930.degree. C. The composite is comprised of a metal component which lends strength and elasticity to the structure, a fluoride salt component which provides lubrication and, lastly, a glass component which not only provides oxidation protection to the metal but may also enhance the lubrication qualities of the composite.