620961-A is referenced by 2 patents.
620,961. Retractive switches. CRABTREE & CO., Ltd., J. A., and HILL, W. E. Feb. 5, 1947. No. 3379. [Class 38(v)] A push-button switch has a deformable cup associated with the button to ensure a waterproof assembly. A corrugated cup a of rubber or other flexible material has at its open end a bead k seated around a spigot part m of the switch casing. At its closed end it has a central depression c for engagement with the push button d of the switch, a cavity containing a moulded part e, and an external flange b which is trapped in an annular groove between flanges f, h of a metal gap g. In a modification, Figs. 3, 4 (not shown), the rubber cup is fixed in the metal cap by means of an annular washer which is forced past spring tongues in the cap.