Control mechanism for raising and lowering window covering
USRE48355E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2019 |
| Grant date | Dec 15, 2020 |
| Priority date | — |
| Expiry date | Feb 12, 2039 |
Classification
- Technology area (CPC —)General
Abstract
A control structure for a window covering includes a base, a revolving wheel having an axial post, a restriction means including a bushing fitting around the axial post, a transmission member provided on a side of the bushing, and at least one pawl connected to the axial post. The revolving wheel is connected to the base. The restriction means has at least one cutting groove. The transmission member has at least one abutting portion on an inner wall thereof. The pawl is pivotable within a width of the cutting groove. When the revolving wheel is rotated forward, an end of the pawl passes through the cutting groove to mesh with the abutting portion. When the revolving wheel is rotated backward, the pawl disengages from the abutting portion, and the transmission member is rotatable relative to the revolving wheel. Whereby, it could prevent generating noise while operating the window covering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.