Dispensing – Axially rotary and longitudinally movable tubes – sleeves – or... – Axial discharge
Patent
1994-01-04
1996-03-26
Kaufman, Joseph A.
Dispensing
Axially rotary and longitudinally movable tubes, sleeves, or...
Axial discharge
B67D 300
Patent
active
055013775
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a rotatable central sealing pin cap for a container, having a stationary part fixed with respect to the container, as well as a detachable pouring screw cap threadedly adjustable with respect to the stationary part, for adjustment between an open and a closed position by moving a sealing pin on the stationary part into an opening in the detachable pouring screw cap.
2. Description of Prior Art
A closable central sealing pin cap is disclosed in U.S. Pat. No. 3,319,843. The two parts required are economically mass-produced from slightly flexible, deformable plastic in injection molding procedures. Two essential, basic requirements are made on the central sealing pin cap: problem-free function during use and the capability for easy assembly.
The closable central sealing pin cap of the '843 patent was designed for use with a reusable container and for easy cleaning of the closable central sealing pin cap. However, the high costs of taking back, cleaning and refilling the containers in industry have become disproportional to production costs, so that the disposable container, or more specifically, the disposable bottle, has caught on for many household applications, particularly for free-flowing media such as shampoos.
SUMMARY OF THE INVENTION
Today a substantial user-friendly quality is required of a rotatable central sealing pin cap that is reliable and simple to use without the danger of over-twisting. In addition, one object of the invention is that a closable central sealing pin cap must be assembled quickly, automatically and simply.
This object and other objects are achieved in a rotatable central sealing pin according to one preferred embodiment of this invention where a twist stop limits rotational movement in an opening direction and a closing direction, and an axial stop limits axial movement in an axial direction.
Although conventional central sealing pin caps can be automatically assembled, rotational motion is restricted only in a closing direction by a stop. In contrast, in accordance with one preferred embodiment of this invention, a twist stop limits rotational motion in a closing and an opening direction and an axial stop is provided for facilitating assembly. Most commonly used plastics allow a slight, flexible deformation, so that damage is prevented by a ratchet-like run-up of two threads on one another. This invention permits different and particularly advantageous embodiments. Thus the axial stop is preferably embodied as a pre-assembly stop or support shoulder for loose placement or preassembly of a detachable pouring screw cap on a stationary part to prevent a troublesome contact of the threads in a pre-assembly position. In this way the detachable pouring screw cap, which is produced separately, is first loosely placed on top and remains in this position without the threads touching one another. This allows the two parts to be brought toward one another in an axial orientation and the threads on both parts to be pressed over one another afterwards, so that these are precisely engaged when in a closed position of the cap. In one preferred embodiment, the axial stop is an annular shoulder on the stationary part and on the detachable pouring screw cap, and achieves the function of an annular sliding bearing.
In one preferred embodiment, the twist stop is formed from a radial rib and an annular wall that are disposed either on the detachable pouring screw cap or the stationary part, and an axially protruding positioning tip is disposed at the end of the annular wall to limit rotational motion of the two parts with respect to one another in the pre-assembly position. This position can be found either manually or automatically with, for example an assembly friction band that lightly touches laterally, and twists the detachable pouring screw cap until the annular wall touches the positioning tip. In this position the detachable pouring screw cap can be pushed over the axial stop from the pre-assembly position,
REFERENCES:
patent: 3259282 (1966-07-01), Jellesen
patent: 3263851 (1966-08-01), Grimsley
patent: 3319843 (1967-05-01), Stull
patent: 3768698 (1973-10-01), Corty, Sr. et al.
patent: 4646949 (1987-03-01), Stull
patent: 5037406 (1991-08-01), Smith et al.
patent: 5044530 (1991-09-01), Stull
patent: 5284277 (1994-02-01), Levenberger
Createchnic AG
Kaufman Joseph A.
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