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).
Blueprint illustrating the mechanical principle of the Drake Lock-Nut.
| Identifier | ExFiles\Box 77\5\ scan0226 | |
| Date | 30th March 1920 | |
| DRAKE LOCK-NUTS TRADE MARK REGISTERED U.S. PAT. OFF. SHOWING MECHANICAL PRINCIPLE PATENTED 7-2-18 CONTACT ONLY AT THIS POINT GIVES THE EXTREME LEVER ARM AND MAXIMUM POWER FOR FLEXING OR COMPRESSING NO STRAIN ON THIS PART OF TOP MEMBER DOES NOT SEAT ON HORIZONTAL LINE ELIMINATING OLD JAM NUT PRINCIPLE STRAIN OF CONTACT IS THRU STRONGEST PART OF TOP MEMBER. 25° ANGLE GIVING GREATER ELEMENT OF SHRINK THAN OF LIFT PREVENTS LIFTING LOAD OFF LOWER MEMBER. ABUNDANCE OF THREADS TO PULL UP AND CARRY THE LOAD. AMPLE WRENCH HOLD. DRAKE LOCK-NUT CO. CLEVELAND SAN FRANCISCO DRAKE LOCK-NUT SHEET #38-75-DR.7 REVISED TO MAR. 30. 1920 | ||