Captive cap for dispensers

Claim 1

A captive dispensing cap construction comprising, in combination: a. a tubular body part adapted to be carried by a container and having a discharge spout, b. a screw cap part carried by said body part and surrounding said discharge spout, c. said cap and body parts having two pairs of mutually engageable portions, d. one pair of mutually engageable portions comprising cooperable screw thread means respectively on said parts, for moving the cap part axially on the body part as the cap part is turned, e. the other pair of mutually engageable portions comprising cooperable stop lugs disposed respectively on the body and cap parts only at circumferentially localized points, said lugs having a plurality of sets of mutually engageable surfaces which are disposed in planes substantially parallel to the axis of the tubular body. f. one set of said mutually-engageable surfaces of the lugs becoming engaged and acting in a manner to halt the turning of the cap part as the latter is screwed toward its full-on position on the body part, g. another set of surfaces of the said lugs becoming engaged and halting the opposite turning of the cap part as the latter is unscrewed through part of a revolution from said full-on position, h. one of the mutually-engageable surfaces of said stop lugs having a sloping camming with respect to the other stop lug, to cam one lug radially outwardly and facilitate bypass of the lugs as the cap part is screwed onto the body part, i. at least one of said parts having lug-carrying wall portion which is resilient and yieldable in a radial direction and capable of localized stretching to enable the stop lug on the cap part to be forced past the outside of the stop lug on the body part as the cap part is applied to the body part and screwed toward its full-on position. j. said lugs engaging one another along an arc of substantially less than 9* during said bypass of the lugs.