1686 W. Molyneux iv. 12 The several parts of the Ruler-joynt..are represented all apart in Figures by themselves.
1832 ii. 52 They [sc. the lances] are to have a joint, which is called a ruler joint.
1954 H. M. Cruickshank & K. Davis i. 2 The idea was to use carbide-tipped hammers in the machines used for riveting ruler joints together.