Spice Grinder

A grinder has a jar having a surface provided with a screwthread. A grinding cap has a lower part engageable over the surface of the jar and provided with a screwthread such that the lower part can be screwed onto the jar and an upper part rotatable on the lower part. Grinding formations on the parts are effective on relative rotation of the parts. A ramp projects radially from the jar surface toward the cap surface, and a generally angularly extending and radially elastically deflectable arm has an inner end fixed on the cap surface and an outer end spaced in a relaxed condition of the arm radially outward from the cap surface toward the jar surface. The arm is oriented to engage and have its outer end deflected radially toward the cap surface by the ramp on screwing of the lower part onto the jar.

FIELD OF THE INVENTION

The present invention relates to a grinder. More particularly this invention concerns a spice grinder for culinary purposes.

BACKGROUND OF THE INVENTION

The invention relates to a spice grinder that can be screwed onto a jar containing a spice, where the jar has at least one outward projection that interacts in such a way with an inward projection or a part of the spice grinder that is to be screwed onto the jar so as to block any reverse rotation after the two projections have moved past each other as the spice grinder is screwed onto the jar.

It is frequently desirable or even necessary to close a container provided with a screw-type closure in such a way that the container can no longer be opened by turning the screw-type closure in the reverse direction. In this manner, inadvertent removal of the cap and spilling the contents is avoided. This is also true of glass spice containers onto which a spice grinder, typically of plastic, can be installed. These units involving a jar with a spice grinder built into the cap are disposable items, not intended for refilling.

Approaches have already been proposed for preventing the spice grinder from being unscrewed from the jar. These spice grinders have the features described above. For instance, US 2012/0286081 proposes providing complementary ramp or sawtooth shaped structures on the cap and on the jar, with their shallow and steep flanks oriented oppositely. The cap can be screwed on the shallow flanks of the formations meeting and sliding over one another with elastic deformation of the cap and/or jar when the cap is first screwed onto the jar. Once screwed on, reverse rotation of the cap on the jar will cause the two steep flanks to angularly flatly abut each other, thereby blocking removal of the cap.

Instead of the two ramp formation, U.S. Pat. No. 4,669,624 proposes one ramp formation coacting with another radially projecting ridge of uniform radial height. Similarly, EP 0,571,780 proposes ramp-shaped formations on one of the screwthreads that cuts into the material of the other part and inhibits reverse rotation. The functioning is similar.

The problem with these systems is that substantial deformation of the jar neck and/or cap is necessary to screw the cap onto the jar. The deformation can damage the parts and also makes assembly of the product difficult.

Further, with this system the locking is not very strong. The ramps are designed for easy assembly, so that a hard reverse turn can overcome the ramps and unscrew the cap. Since the spice grinder is meant to be used by all types of people, a particularly strong person who reverse-turns the cap can damage the latch and free the cap. Furthermore, on small bottles, it is impossible to provide sufficiently large formations to adequately resist reverse rotation. On the other hand, large-mouth jars cannot be made flexible enough for the system to work effectively and typically require considerable torque to get the cap properly screwed onto the jar. The problem with large jars is that they must be gripped with considerable radially inwardly effective force, directly counter to the outward radial deflection needed to allow the ramps to pass each other, especially when the jar is of glass with no meaningful elasticity.

OBJECTS OF THE INVENTION

It is therefore an object of the present invention to provide an improved spice grinder.

Another object is the provision of such an improved spice grinder that overcomes the above-mentioned disadvantages, in particular that is easy to assemble, even for a large jar or other container, yet that very strongly resists unscrewing of the cap.

SUMMARY OF THE INVENTION

A grinder according to the invention has a vessel adapted to hold a material to be ground and having a surface centered on an axis and provided with a screwthread formation. A grinding cap therefore has a lower part engageable into or over the surface of the vessel and provided with a screwthread formation complementary to that of the vessel such that the lower part can be screwed to the vessel and an upper part rotatable about the axis on the lower part. Grinding formations on the parts are effective on relative rotation of the parts to grind the material in the vessel. In accordance with the invention a blocking formation projects radially from one of the surfaces toward the other surface, and a generally angularly extending and radially elastically deflectable arm has an inner end fixed on the other surface and an outer end spaced in a relaxed condition of the arm radially outward from the other surface toward the one surface. The arm is oriented to engage and have its outer end deflected radially toward the other surface by the blocking formation on screwing of the lower part onto the vessel.

Thus according to the invention when the spice-grinder cap is screwed on, the flexible arm easily slides over the projecting blocking formation on the jar, then snaps back and reliably blocks the grinder from turning in reverse.

The blocking formation according to the invention has, relative to a rotation direction of the cap relative to the vessel on screwing the cap onto the vessel, a downstream shallow flank and an upstream steep flank. The outer end of the arm is directly angularly juxtaposed with the steep flank after passing over the blocking formation on screwing of the cap onto or into the vessel.

In addition the outer end of the arm is flat and extends generally radially of the axis and parallel to the steep flank in the relaxed condition of the arm but extends at a small is acute angle to a radius from the axis on deflection by the blocking formation.

The arm is normally on the surface of the cap, which is typically made of plastic, and the blocking formation on the surface of the vessel, which is typically a glass jar. The arm is unitarily formed with the lower part.

DETAILED DESCRIPTION OF THE INVENTION

As seen inFIGS. 1aand 1ba spice-grinder cap has a one-piece upper part1and a one-piece lower part10, both typically injection molded of a hard but elastically deformable plastic and centered on an axis A. A cover2is releasably snap-fitted onto the upper part1. The upper part1and lower part10are rotatable relative to each other about the axis A, and the lower part10can be secured by a radially inwardly open screwthread groove11onto a radially outwardly projecting screwthread ridge14of a neck of a jar13. The lower part10is provided with teeth3, while the upper part1is provided with teeth4that interact therewith to grind spices or similar material as is well known in the art by relative rotation of the two parts10and11about the axis A. Typically rotation in either direction is used for grinding in an oscillatory motion.

In use, the cover is removed, the jar13is turned upside down, and the two parts1and10are rotated relative to each other. Inverting the jar3dumps unground spices, e.g. peppercorns, from the jar13into the part10, and relative rotation of the parts1and10causes the built-in grinder formed by the teeth3and4on the parts10and1to comminute the unground spices, that then drop out. This is all standard.

The embodiment according to the invention as described below is provided in order to prevent the spice grinder, in particular, the lower part10, from being unscrewed from the jar13after it has been screwed on. Thus the user will not inadvertently unscrew the entire cap1,10when using the grinder.

FIGS. 2 and 3show that at least one, in the example, two inwardly projecting arms are provided diametrically opposite each other on the lower part10with the female screwthread formation11. These arms12are elastically radially deflectable and interact with respective ramp-like or sawtooth projections15on the jar13that is provided with the screwthread formation14. The outer free end of the arm12is radially offset from the inner end fixed to, and in fact unitary with, the part10so the outer arm can be elastically radially deflected relatively easily, yet the arm is very difficult to compress longitudinally. The arm12has a length extending from the surface-fixed end to the outer end and, in the illustrated example, the length of the arm is greater than a width of the arm.

It is also within the scope of the invention for the arm(s)12to be on the jar13and the projection(s)15on the cap part10RM. But because the jar13is typically made of glass and the part10of plastic, the illustrated embodiment with the arm12on the part10and the projection(s)15on the jar13is preferred. Further, the combination of the projection(s)15, or blocking formations, and the elastically deflectable arm(s)12can be regarded as a blocking system that blocks counter-rotation of the jar, or other container, and the cap part10.

FIGS. 6 through 8are schematic views showing the interaction between one of the projections15and the respective arm12when the lower part10is screwed onto the jar13, or when there is an attempt to unscrew it. As described below, each of the projections can be regarded to be a blocking formation, which has a shallow surface19, or ramp or sliding surface, and a steep surface18, the latter a blocking surface.

First, as shown inFIG. 6, when the lower part10is screwed in the direction of arrow F1onto the jar13, the flexible arm12moves past the ramp19of the blocking formation15, flexing elastically radially outward, in an elastically biased state, about an imaginary pivot point16and sliding past the ramp19. The arm12is pushed, or elastically biased, outward as its outer end slides over the shallow surface19of the blocking formation15. As shown inFIG. 6, during rotation of the cap to fit and secure the lower part of the cap to the container, indicated by arrow F1, the non-fixed outer end of the arm is the trailing end of the arm, the fixed end being the leading end.

Then, as shown inFIG. 7the flexible arm12snaps elastically back inward so that its outer end17angularly confronts the steep end face or blocking surface18of the blocking formation15.

Subsequently, as shown inFIG. 8, an attempt to counter-rotate the part10in a direction F2unscrewing it from the jar13will only force the end17into solid flat contact with the blocking surface18, thereby solidly opposing unscrewing of the cap. The end17is planar and is beveled at an acute angle α relative to the radially extending face18to enhance/create a wedging effect and force the inner end17radially inward. As shown inFIG. 8, during counter-rotation of the cap, indicated by arrow F2, the non-fixed outer end of the arm is the leading end of the arm, the fixed end being the trailing end.

Numerous modifications are possible to dispose a plurality of circumferentially spaced-apart projections15, or blocking formations, on the jar13, and a plurality of circumferentially spaced-apart flexible arms12on the lower part10. The dynamic principle according to the invention could also be applied to other containers that include a screw-type closure.