Bottles and jars – Closures – Frangible member or portion
Patent
1995-03-15
1996-12-10
Cronin, Stephen
Bottles and jars
Closures
Frangible member or portion
B65D 4134
Patent
active
055823084
DESCRIPTION:
BRIEF SUMMARY
BACK GROUND OF THE INVENTION
The present invention relates to a cap with a pilfer-proof packaging mechanism which is fitted to a cylindrical neck of a vessel.
Some of caps which are fitted to cylindrical necks of vessels, respectively, are provided with pilfer-proof packaging mechanisms. The pilfer-proof packaging mechanism is a mechanism for visually verifying whether a cap has not been opened yet or has been opened.
A conventional cap provided with a pilfer-proof packaging mechanism comprises an integrally molded product in which a cap body and a ring portion with catching pieces disposed below the cap body are connected each other with thin bridges at some portions on the peripheral direction thereof. When the cap is screwed on a cylindrical neck of a vessel, the catching pieces of the ring portion catch a flange of the cylindrical neck of the vessel so that the cap is set to the vessel.
By turning the cap body in an opening direction, the bridges are broken so that the cap body can be detached from the cylindrical neck of the vessel and the ring portion stays at the cylindrical neck.
In the conventional cap as mentioned above, the ring portion stays at the cylindrical neck keeping its shape in a tubular configuration when taking off the cap body. Therefore, as the cap body is screwed again on the cylindrical neck after taking off the cap body once, the cap body and ring portion seem like integrated when seen from a distance, that is, the cap sometime looks like as an sealed cap.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a cap with a pilfer-proof packaging mechanism which allows for sure verification of whether the cap has been opened or has not been opened yet.
A cap according to the present invention is a cap, made of resin, to be screwed down to a cylindrical neck of a vessel, and has a pilfer-proof packaging mechanism which can verify whether the cap has not been opened yet or has been opened.
The cap comprises a resin cap body formed in a cylindrical shape with a top, and a resin pilfer-proof ring fixed to a bottom portion of the cap body. The cap body is provided with an internal thread on an upper inner surface thereof. The pilfer-proof ring comprises (a) an annular member and (b) elastic catching pieces.
(a) The annular member comprises a plurality of blocks which are disposed in an annular shape and are connected to the adjacent one by first connecting members. One of the first connecting members has a section area which is smaller than that of the other first connecting members so as to make the first connecting member frangible.
The annular member is partially bonded to the cap body at a plurality of portions on the circumferential direction thereof. To bond the annular member to the cap body, ultrasonic welding or other manners may be employed. A bonded portion disposed at an opening direction side of the frangible one of the first connecting members has a bonding area is larger than that of the other bonded portions so as to make bonding strength to the cap body larger than that of the other portions.
(b) The elastic catching pieces are disposed inside said annular member. The elastic catching pieces extend diagonally inwardly toward a top of the cap body. End portions of the elastic catching pieces are elastic-deformable to elongate the diameter of a circle formed by all of the elastic catching pieces and are able to catch a flange disposed below the external thread disposed on the cylindrical neck of the vessel.
The pilfer-proof ring may be bonded to the cap body by ultrasonic welding.
The frangible one of the first connecting members is provided with a section decreased portion decreasing the vertical sectional area thereof so that the frangible one of the first connecting members can be easily broken.
The blocks of said annular member have standing walls, to be inserted inside a lower portion of the cap body, respectively, so that the pilfer-proof ring can be easily fixed to the cap body.
The standing walls may be separated to each other, or the st
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patent: 3937348 (1976-02-01), Guala
patent: 4530436 (1985-07-01), Weidmer
patent: 4700859 (1987-10-01), Gregory
patent: 4746026 (1988-05-01), Leonhardt
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patent: 4919285 (1990-04-01), Roof et al.
patent: 5080246 (1992-01-01), Hayes
patent: 5135123 (1992-08-01), Nairn et al.
patent: 5328044 (1994-07-01), Rohrs et al.
Kishi Takao
Nakamura Hiroyuki
Cronin Stephen
Yoshino Kogyosho Co. Ltd.
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