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).
Technical leaflet for the 'Drake' Lock Nut, explaining its mechanism, benefits, and applications.
| Identifier | ExFiles\Box 77\5\ scan0227 | |
| Date | 30th March 1920 guessed | |
| Frozen to the Bolt Not a Jam Nut FROZEN TO THE BOLT Cannot be Jarred Loose The flexible finger members of the lower or nut member are compressed inward toward center of bolt with tremendous force by screwing down the upper or locking member, thus freezing the nut to the bolt, which, when released, will move the same as any ordinary nut and do absolutely no harm to either thread. Bolt and nut can be used over and over again without any harm to the threads. No washer is needed. To apply. The prime member pulls up the work to exact adjustment required; a micrometer adjustment is obtained; then apply locking member with firm turn up. Members do not meet on horizontal line. Contact is only on annular bevels; thus the load is not lifted off prime member. To remove. Release upper or locking member a half turn; then wrench on both parts and they will come off together. Nut can be locked at any point on bolt using two wrenches. The locking member joins in load-carrying capacity when locked down. The hexes can be matched in locking the nut, thus forming a "finished job." Only standard hexagons throughout. Any regular wrench can be used. Made from (special screw stock) steel, turned from the solid bar. The mechanical principle is simple and correct. The movement of the slotted members is centering radial only and not circumferential, when being locked, which would wear the threads. Simple and Correct Mechanical Principle PATENTS U.S.A., Sept. 19, 1916 " July 2, 1918 England, Feb'y 12, 1917 France, Mar. 3, 1917 Italy, Mar. 5, 1917 Argentine, April 2, 1918 Norway, Mar. 20, 1917 PATENTS PENDING RUSSIA JAPAN GERMANY Easy to Apply Note that the “Drake” Nut locks the dead member, not the moving member. “Fool Proof” The mechanic or amateur who never saw or heard of the “Drake” Lock Nut could not make a mistake in handling it. It tells its own story on examination and cannot be injured by investigation. Note the abundance of threads in the lower or nut member, which gives a tremendous load-carrying capacity and strength to pull up the work. “Drake Lock Nuts” have remained tight after months of vibration on 3" piston air drills. “Drake Lock Nuts” have remained tight after the most severe strain and vibration on steam hammers in one of the largest forge plants in Detroit. “Drake Lock Nuts” were placed in marine work where double 1" nuts could not be kept tight a day and are now tight and unmoved after months of service. “Drake Lock Nuts” are in use by the largest Diesel engine builders. The largest and best manufacturers of heavy duty machinery of all kinds are using “Drake Lock Nuts” on points where severe vibration occurs. “Drake Lock Nuts” 1/2" U. S. S. size withstood a tensile strain of 154200 lbs. per square inch. Equip with “Drake Lock Nuts” if you are building heavy duty machinery or engines. Specify “Drake Lock Nuts” if you are ordering any heavy duty machinery. | ||