Reservoir and fluid product dispenser with safe unscrewing

1. A fluid reservoir ( 1 ) having a neck ( 11 ) defining a substantially cylindrical drum ( 12 ) and an opening ( 110 ), said neck being externally provided with an external thread ( 13 ) serving to co-operate with a ring ( 21 ) internally provided with an internal thread ( 210 ) having the same pitch as the external thread ( 13 ) of the neck, the external thread ( 13 ) projecting radially outwardly from the drum and having a crest defining a crest line, the thread being provided with locking means ( 16 ) to prevent the ring from being unscrewed, said locking means comprising at least one projection ( 16 ) situated under the external thread ( 13 ) on a path of the internal thread ( 210 ), and wherein said projection ( 16 ) comprises a ramp ( 161 ) on which the internal thread ( 210 ) engages during tightening, and a locking edge ( 162 ) at the end of the ramp ( 161 ) defining therebeyond a locking wall ( 163 ) against which the internal thread ( 210 ) abuts in the event of unscrewing, and wherein the ramp ( 161 ) slopes gently downwards, the locking edge extending from the drum to the crest line; and wherein the projection projects away and below the external thread.

2. A fluid reservoir according to claim 1 , in which the locking wall ( 163 ) extends radially perpendicular to the external thread.

3. A fluid dispenser including a reservoir according to claim 1 .

4. The reservoir according to claim 1 , in which the locking edge ( 162 ) is substantially straight and extends from the drum ( 12 ) to the crest ( 130 ) of the thread ( 13 ).

5. The reservoir according to claim 1 , in which the ramp extends from the drum ( 12 ) to the crest ( 130 ) only at the level of the locking edge ( 162 ).

6. The reservoir according to claim 1 , in which said ramp ( 161 ) has an outer surface inclined downwardly, said surface having a first end located at the level where the thread connects the drum, on upper edge extending from the first end to the crest, a lower edge extending along the drum and the locking edge connecting the lower edge to the upper edge.

7. A fluid reservoir having a neck defining a substantially cylindrical drum and an opening, said neck being externally provided with an external thread serving to co-operate with a ring internally provided with an internal thread having the same pitch as the external thread of the neck, the external thread projecting radially outwardly from the drum and having a crest defining a crest line, the thread being provided with locking means to prevent the ring from being unscrewed, said locking means comprising at least one projection situated under the external thread on a path of the internal thread, and wherein said projection comprises a ramp on which the internal thread engages during tightening, and a locking edge at the end of the ramp defining therebeyond a locking wall against which the internal thread abuts in the event of unscrewing, and wherein the ramp slopes gently downwards, the locking edge extending from the drum to the crest line;

wherein the locking wall extends radially perpendicular to the external thread; and

in which the reservoir is made by molding by using two half-shells which define a join plane between them, the locking edge ( 162 ) being situated in said join plane.

8. A reservoir according to claim 7 , in which the locking edge ( 162 ) connects the crest ( 130 ) of the external thread to the cylindrical drum ( 12 ).

9. A reservoir according to claim 8 , in which the ramp ( 161 ) defines a substantially plane surface extending from where the thread ( 13 ) meets the drum ( 12 ) to the edge ( 162 ).

10. A fluid reservoir having a neck defining a substantially cylindrical drum and an opening, said neck being externally provided with an external thread serving to co-operate with a ring internally provided with an internal thread having the same pitch as the external thread of the neck, the external thread projecting radially outwardly from the drum and having a crest defining a crest line, the thread being provided with locking means to prevent the ring from being unscrewed, said locking means comprising at least one projection situated under the external thread on a path of the internal thread, and wherein said projection comprises a ramp on which the internal thread engages during tightening, and a locking edge at the end of the ramp defining therebeyond a locking wall against which the internal thread abuts in the event of unscrewing, and wherein the ramp slopes gently downwards, the locking edge extending from the drum to the crest line; and

in which the external thread ( 13 ) is provided with at least one recess ( 131 ) formed immediately beyond the projection ( 16 ) in the tightening direction, and wherein the recess breaks the external thread.

11. A fluid reservoir according to claim 10 , in which said recess ( 131 ) includes a stopping wall ( 133 ) situated in the same plane as the locking wall ( 163 ) of the projection ( 16 ) so that the stopping wall and locking wall coincide where they meet.

12. A fluid reservoir according to claim 10 , in which said recess ( 131 ) includes a slope ( 132 ) which extends substantially from the crest of the thread ( 130 ) to the base of the stopping wall ( 133 ).

13. A fluid dispenser comprising:

a fluid reservoir, comprising a neck defining a substantially cylindrical drum and an opening, the neck provided externally with an external thread projecting radially outwardly from the drum and serving to co-operate with a ring internally provided with an internal thread having the same pitch as the external thread of the neck, the external thread having a crest defining a crest line, the thread provided with a lock that prevents the ring from being unscrewed, the lock comprising at least one projection situated under the external thread on a path of the internal thread, and wherein the projection comprises a ramp on which the internal thread engages during tightening, and a locking edge at the end of the ramp defining therebeyond a locking wall against which the internal thread abuts in the event of unscrewing, and wherein the ramp slopes gently downwards, the locking edge extending from the drum to the crest line; wherein the projection projects away and below the external thread and wherein the neck is made of glass; and

a fixing member that fixes one of a pump and valve on the reservoir, the fixing member defining a fixing ring provided with the internal thread that is configure to co-operate with the external thread of the neck, and wherein the fixing member is made of molded plastics material.

14. The fluid dispenser according to claim 13 , wherein the internal thread is continuous.

15. A fluid dispenser comprising:

a fluid reservoir, comprising a neck defining a substantially cylindrical drum and an opening, the neck provided externally with an external thread projecting radially outwardly from the drum and serving to co-operate with a ring internally provided with an internal thread having the same pitch as the external thread of the neck, the external thread having a crest defining a crest line, the thread provided with a lock that prevents the ring from being unscrewed, the lock comprising at least one projection situated under the external thread on a path of the internal thread, and wherein the projection comprises a ramp on which the internal thread engages during tightening, and a locking edge at the end of the ramp defining therebeyond a locking wall against which the internal thread abuts in the event of unscrewing, wherein the ramp slopes gently downwards, the locking edge extending from the drum to the crest line, and wherein the locking edge is substantially straight from the drum to the crest line; and wherein the projection projects away an below the external thread; and

a fixing member that fixes one of a pump and valve on the reservoir, the fixing member defining a fixing ring provided with the internal thread that is continuous and configure to co-operate with the external thread of the neck.