The invention relates to screw-on container closures. More particularly, the invention relates to child-resistant closures.
Among numerous examples of child-resistant closures for small over-the-counter (OTC) medications (e.g., pills, capsules, tablets) is U.S. Pat. No. 5,671,853 of Herr, issued Sep. 30, 1997.
One aspect of the disclosure involves a child-resistant container having a container body having an externally threaded neck and a first pair of engagement features. A cap closes the container body in a closed condition and is removable from the closed condition. The cap comprising the unitary combination of an inner sidewall and an outer sidewall. The inner sidewall has an internal thread for engaging the neck external thread. An outer sidewall for gripping by a user has a first pair of segments and a second pair of segments. The second pair of segments are hinged to the inner sidewall for depressably flexing from relaxed condition to a flexed condition and bear a second pair of engagement features. In the installed condition of the cap and relaxed condition of the second pair of segments, the first pair of engagement features and second pair of engagement features are positioned to collide to block an unscrewing rotation of the cap. An upper web joins the inner sidewall and the outer sidewall first pair of segments. A pair of respective hinges between the second pair of segments and the inner sidewall merge with the inner sidewall at a location recessed from an upper end of the inner sidewall.
The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the invention will be apparent from the description and drawings, and from the claims.
Like reference numbers and designations in the various drawings indicate like elements.
The exemplary closure 24 is a one-piece closure. An exemplary closure piece is molded plastic (e.g., injection molded). Exemplary plastics are polyolefins such as polypropylenes and polyethylenes. The closure may comprise an additional member such as an elastomeric or paper seal or gasket, safety seal, or the like.
The closure further comprises an outer sidewall 70 (
The gripping portions 72 extend from a lower rim 80 to an upper end 82. The upper end 82 merges with a periphery of the web 56. The gripping portions 72 each have an inboard or inner diameter (ID) surface 84 and an outboard or outer diameter (OD) surface 86. The exemplary surface 86 bears a series of lands and grooves or other contouring to facilitate gripping. Between the outer sidewall ID surface 84 and the inner sidewall OD surface 60, a plurality of radial webs 90 join the inner sidewall to the outer sidewall for structural integrity.
The release tabs 74 also extend from a lower rim 100 to an upper end 102 (
Additionally or alternatively, recessing may be measured relative to inner sidewall height.
The exemplary upper ends 102 are also recessed (e.g., by a height HRT). This recessing both conserves material and helps locate the user's fingers downward from the webs 110 to provide leverage. Exemplary HRT is at least 10% or at least 20% or at least 25%; exemplary upper limits if desired are 30% or 40% or the recessing may be in a range of pairs of such upper and lower limits.
As is discussed further below, the body and closure have two pairs of engagement features 120 (
The exemplary engagement features 120 (
As is discussed further below, the surfaces 123 are ramp surfaces and the surfaces 124 are stop surfaces. The surfaces 124 are relatively longitudinal so as to cooperate with complementary surfaces of the closure engagement features 122 to resist unscrewing motion absent the aforementioned manipulation. The surfaces 123 allow the closure engagement features to override in a screwing/installing rotation as is discussed further below.
However, lower portions of the OD surfaces 106 of the tabs may be squeezed inward flexing the web/hinge 100 and bringing the channels 170 into radial registry with the features 120. In this condition, while maintaining compression between the release tabs, the closure may be unscrewed via an unscrewing rotation about the axis 500 with the each of the features 120 passing circumferentially through the adjacent channel 170.
In an installing rotation, one need not squeeze the release tabs. Instead, the ends 146 (or a rounded transition between them and the lower ends 142) will engage the ramping surface 123 (and/or a curving transition to the apex region 130). The angling of the meeting surfaces is sufficient to flex the closure (e.g., radially outwardly flex the release tabs) to permit an overriding return to the installed condition.
One or more embodiments of the present invention have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the invention. For example, desirability of reusing existing molding and/or capping equipment may influence particular implementations. Accordingly, other embodiments are within the scope of the following claims.
Benefit is claimed of U.S. Patent Application No. 62/136,861, filed Mar. 23, 2015, and entitled “Child-Resistant Closure” the disclosure of which is incorporated by reference herein in its entirety as if set forth at length.
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Applicant Admitted Prior Art: photos of generic atorvastatin containers, Mar. 18, 2015. |
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20160280429 A1 | Sep 2016 | US |
Number | Date | Country | |
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62136861 | Mar 2015 | US |