Swivel joint for a support arm adjustably receiving an appliance, lighting fixture or the like

Pipe-shaped extension arms fastened to a swivel joint having a cable lead therethrough, said swivel joint comprising,

• two joint shells,
• said two joint shells being limitedly rotatable about a common axis and held together axially,
• each of said two joint shells having one tubular outrigger arm for connection to one of each of said pipe-shaped extension arms,
• actuation element means adjustably engaged to said two joint shells for permitting rotation of said two joint shells in relation to each other and locking said two joint shells in a particular rotated position,
• said actuation element means having a manually actuatable pushbutton (8) and an axially displaceable spring-loaded blocking device (9),
• said blocking device (9) cooperatively engaged in a form-filling and/or force-locking fashion with both said two joint shells (3, 4) in a blocking position where rotation of said two joint shells (3, 4) is blocked and with only one of said two joint shells (3) in a release position where rotation of said two joint shells is possible,
• said actuation element means being disposed in both said two joint shells (3, 4), and said pushbutton (8) being connected to said blocking device in a force-locking fashion,
• wherein said two joint shells (3, 4) each have on their inside a concentric cylinder ring (15, 16) rising from a shell bottom,
• wherein each of said two joint shells (3, 4) each have one encompassing receiving chamber (23) around each said cylinder ring (15, 16), and each said chamber together form a common, continuous receiving chamber (23) said cable (1) to be passed therethrough, and each said outrigger arm (5, 6) is continuously connected to said receiving chamber (23) by conduits (5a, 6a), each via a respective recess (24) in an associated joint shell of said two joint shells (3, 4),
• wherein the blocking device (9) has at least one stop (11), and both the blocking device (9) and stop (11) are completely contained within the cylindrical ring (15, 16).