Dispenser with disengageable screw mechanism
US6550999B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2001 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Apr 6, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA45D40/04
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The dispenser (1) includes a body (2), a cap (11), a propellant device (3) including a base plate (4) with an axial screw (5), fixed on said base plate, a plunger (6) formed of a medium (8) of said stick and of a central nut (7), engaging by screwing with the axial screw, a bottom (12) and/or a knob for rotating the axial screw, and is characterized in that:a) engagement between the thread (50) of the screw (5) and the thread (70) of the nut (7) is partial, one of the two threads extending only over a predetermined angular fraction, so as to form a so-called partial thread,b) the central nut (7) and/or the axial screw (5) include a radial resilience means, constituting an aptitude for radial distortion under stress,so as to allow, in the event of forced rotation under stress and of locking of the screw relative to the nut, a disengagement, i.e. a relative axial movement of the “male” and “female” spirals, by overlap of the spirals and clearance of a screw thread, without destroying the engagement between screw and nut.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.