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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Patent specification for an improved solid or semi-solid upper cylinder lubricant.

Identifier  ExFiles\Box 145\3\  scan0149
Date  3rd April 1936
  
2
460,345

of the gas is extruded through the relief valve at a temperature a little above the setting temperature, which is, of course, dependent on the wax mixture employed.
5 In the case of the example given above this will be between 120°-135° F.{Mr Friese} The absorbed gas is liberated on congealing of the mixture, producing a cooling effect by its expansion and forming a large
10 number of isolated vesicles or cellules in the congealing mass. The semi-congealed mass may be formed into slabs and afterwards cut into pieces of any desired form, or means may be arranged to cut the ex-truded mass into portions of desired size as it leaves the extrusion nozzle.
According to a further convenient method of carrying the invention into effect, the wax mixture referred to above
20 may be melted in a suitable apparatus adapted to beat the melt in such a way as to entrain air or other gas which may be above the melted mass. By maintaining the temperature at or just above the
25 melting point of the wax mixture, gas beaten into the body will be retained sufficiently well to enable a final product to be obtained containing sufficient gas cellules or vesicles distributed through-
30 out the mass to give an apparent density less than that of petrol or other motor fuel. After being allowed to congeal the mass may be cut to any desired shape or size.
35 Any other means of dispersing a large number of small quantities of gas or vapour in the body of a solid or semi-solid upper cylinder lubricant may be employed in carrying out the invention.
40 Having now particularly described and ascertained the nature of our said invention, and in what manner the same is to be performed, we declare that what we claim is :โ€”
45 1. A solid or semi-solid upper cylinder lubricant which is completely soluble in motor fuel and has a lower apparent density than that of the motor fuel due to incorporation in the mass of small
50 gaseous or vaporous inclusions.
2. An upper cylinder lubricant according to Claim 1 wherein the inclusions are constituted by gas which has been dissolved in the mass under pressure.
55 3. The method of forming a solid or semi-solid upper cylinder lubricant which will float upon the motor fuel and is completely soluble therein which consists in incorporating in the mass small gaseous or
60 vaporous inclusions.
4. Method according to Claim 3 which consists in dissolving gas in the mass under pressure.
5. Method according to Claim 4 which
65 consists in causing the mass to congeal under lower pressure.
6. Method according to Claim 5 which consists in effecting congealing by or after extrusion of the mass.
70 7. Method according to Claim 3 which consists in introducing the gas or vapour into the molten mass by beating supernatant gas or vapour into the mass at or about the melting point of the mass.
75 8. The improved solid or semi-solid upper cylinder lubricant substantially as described.

Dated this 3rd day of April, 1936.

MARKS & CLERK.

Leamington Spa : Printed for His Majesty's Stationery Office, by the Courier Press.โ€”1937.
  
  


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