In Judo texts which use "elbow lock" to refer to bent-arm locks, the term "shoulder lock" appears in two contexts:
- kata-gatame ("shoulder hold", osaekomi-waza)1 2 3
- kata-ha-jime ("single wing choke", shime-waza)4
Here, "lock" appears to be a translation of "katame" - i.e. while these "lock" the shoulder in place, they are not kansetsu-waza since they do not cause pain to the arm by stretching, bending, or twisting it (i.e. they are katame but not ude-hishigi). As such they are legal, as incorporated in the above techniques.
1. My Method of Judo, Mikinosuke Kawaishi (1955)
2. Jūdō, Sakujirō Yokoyama, Eisuké Ōshima (1915)
3. Judo for Young Men, Tadao Ōtaki, Donn F. Draeger (1965)
4. Higher Judo - Groundwork (p.173) (1952)
Figs. 193 and 194 show a strangle-hold combined with a shoulder-lock.