Lamp screw cap

Abstract

The invention provides a lamp screw cap (200) comprising a thread structure (220), wherein the thread structure (220) comprises repetitive elements (225) defining tops (230), valleys (240), and a central plane (250), wherein tops (230) protrude relative to the central plane (250) and wherein the valleys (240) are recessed relative to the central plane (250), wherein: for a plurality of tops (230) applies that each top (230) comprises a first top segment (231), a second top segment (232), and a middle top segment (233), together defining the top (230), wherein the middle top segment (233) is configured most remote from the central plane (250); for a plurality of valleys (240) applies that each valley (240) comprises a first valley segment (241), a second valley segment (242), and a middle valley segment (243), together defining the valley (240), wherein the middle valley segment (243) is configured most remote from the central plane (250); the first top segment (231), the second top segment (232), the first valley segment (241), and the second valley segment (242), have the same first curvature; one or more of the following applies: the plurality of tops (230) have a protruding part (235) protruding relative to the first curvature in a direction away from the central plane (250); and the plurality of valleys (240) have a shallow part (245) receding relative to the first curvature in a direction to the central plane (250).

Dependencies are inferred from the claim text.