Safety lock for container connections

Details Safety lock for container connections Safety lock for container connections

1994-01-03

1997-04-08

Shoap, Allan N.

Receptacles

Closures

Removable closure guided in rotary movement

220293, 220300, 220303, 220319, B65D 4106

Patent

active

056179693

DESCRIPTION:

BRIEF SUMMARY
The invention is directed to a security lock or safety lock for container connections in which at least two cams are arranged at the contacting surfaces of the container connection part and the lock part and cooperate with a radially open groove extending in the circumferential direction and with at least two axially parallel longitudinal grooves at the complementary piece or counterpart in the manner of a bayonet catch.
Such safety locks are used on containers for which it must be ensured that only authorized persons in possession of the appropriate connection pieces fitting the safety lock in question may connect to the container, that is, have access to the contents of the container. For this purpose, a special tool is required, without which it is impossible to remove the lock part from the container connection part and thereby gain access to the contents of the container.
There are already a number of known constructions of such safety locks.
One such construction works with threads as connecting elements between the lock part and the container connection part.
The other construction uses a type of bayonet catch for mechanically connecting the lock part with the container connection part.
In both cases, unauthorized disconnection is prevented by a securing ring which can only be actuated by a special tool.
In the known safety lock of the latter type, i.e., in which the lock part is mechanically connected with the container connection part by a bayonet catch, the surface of the lock part contacting the container connection part has a radially open groove extending in the circumferential direction and two axially parallel longitudinal grooves of identical width which are arranged so as to be offset at a circumferential angle of 180.degree. relative to one another and are thus located opposite one another at the circumference of the lock part. The two axially parallel longitudinal grooves proceed from opposite longitudinal edges of the radially open groove extending in the circumferential direction and cooperate with two cams which are arranged at the inner circumference or contacting surface of the container connection part and face toward the container axis and radially inward. These cams are also offset by 180.degree. in the circumferential direction of the container connection part and are offset relative to one another parallel to the longitudinal axis of the container connection part at different heights of the latter.
In order to produce a number of noninterchangeable valve variants and container variants with safety locks of the type mentioned above for different applications, e.g. for chemicals on the one hand and beverages on the other hand, it has already been suggested to provide the cams and grooves of the safety locks for beverage containers with different, e.g. smaller, width dimensions than the cams and grooves on the safety locks for chemical containers. This ensures that the lock part of a safety lock for beverage containers having narrow grooves cannot be used in the container connection part of a chemical container having wide cams. But as a result, this would also prevent the filling of a chemical container in a beverage plant, since the connection pieces (tap heads) of the beverage plant would also not fit in the container connection part of the chemical container.
On the other hand, however, in the known safety locks the lock part and consequently also the connection piece (the tap head) for the chemical container with its wide grooves can be used in the container connection part of beverage containers with narrow grooves so that there still exists a considerable safety risk.
Thus, when using these known safety locks it is not possible to provide further safe variations of lock parts and container connection parts which can only be connected in the intended combination simply by changing the widths of the cams and grooves, since the lock part with the wider, axially parallel longitudinal grooves can always be inserted into the container connection part with the narrower grooves.
Th

REFERENCES:
patent: 1927843 (1933-09-01), Norquist
patent: 5150803 (1992-09-01), Caitellone

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