Movable or removable closures – Optionally moved – manually – or by motor – With manually actuated operator
Patent
1989-03-03
1991-12-31
Kannan, Philip C.
Movable or removable closures
Optionally moved, manually, or by motor
With manually actuated operator
49349, 49352, E05F 1500, E05F 1148
Patent
active
050760149
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a window-raising device for a motor vehicle, comprising rotary drive means, a transmission belt which follows a closed path passing onto a drum connected to the drive means and onto upper and lower return pads having curved convex tracks onto which the belt passes by sliding, a carriage affixed to the window and to the flexible transmission element between the upper and lower return pads, and guidance means connected to this carriage, the belt being provided with engagement means which cooperate with corresponding engagement means provided on the drum.
2. Discussion of the Background and Relevant Information
With respect to conventional devices having a cable and pulleys, the window-raising devices of this type have the advantage of a lesser weight, good resistance to water and especially an excellent durability even in the absence of maintenance work, while having a competitive price by virtue of the use of a majority of parts made of synthetic molded material EP-A-0 023 474 describes such a device, in which the motor mechanism comprises a planet gear adapted to either allow alternatively a motorized drive or a manual drive by handle. In effect, one knows that in this case any breakdown hindering the operation of the motor has the effect of hindering all movement of the window, even by a manual drive of the main shaft of the mechanism, because the latter is blocked by the reducer connected to the motor. The solution adopted in the known device consists of connecting the reducer to the main shaft by means of a planet gear whose satellite plate is connected to a reserve manual drive. However, this solution is disadvantageous because such a mechanism is relatively costly, cumbersome and heavy. In addition, one must block the rotation of the satellite plate to allow the motorized drive and likewise prevent the mechanism from being able to turn under the effect of a diminishing pressure applied to the window by a burglar trying to force the door.
SUMMARY OF THE INVENTION
The object of present invention is to perfect the known device as discussed above, so as to achieve a construction which is simpler, more lightweight and inexpensive, and to ensure a better protection against attempted forced entries.
To this end, the device according to the invention is characterized in that the drive means comprise a drive gear which is affixed to a main shaft and which is placed in an axial boring having cogs within the drum, with the cogs of the gear being engaged around its entire circumference with the interior cogs of the drum. The main shaft is connected to a manual activation means and to a motorized activation means comprising an outer gear provided with an axial boring in which the main shaft is coaxially positioned. The boring comprises at least one crown gear projecting within, and the main shaft comprises at least one outwarding projecting corresponding crown gear, arranged to be engaged in the outer gear. The axial length of the crown gears being less than the length of the drive gear, so that the main shaft is slidable, to pass from a motorized drive position in which the respective crown gears are engaged in one another, to a manual drive position in which said crown gears are disengaged from one another without the drive gear being entirely disengaged from the cogs of the drum.
The axial boring of said wheel can include two crown gears separated by a distance greater than their respective widths, and the main shaft may comprise two corresponding crown gears separated by the same distance as the crown gears of the outer gear.
In a preferred embodiment of the device, each return pad comprises a central orifice positioned on the interior side of the curvature of the track and the pad is carried by a fixed pin engaged in the central orifice in a manner so that the pad can pivot around the pin in a limited angle. At least one longitudinal portion of the track is eccentric with respect to the central orifice, with the end of
REFERENCES:
patent: 3791071 (1974-02-01), Bosch
patent: 4085629 (1978-04-01), Fogarollo
patent: 4168595 (1979-09-01), Pickles et al.
patent: 4229906 (1980-10-01), Pickles
patent: 4237657 (1980-12-01), Kazewych
patent: 4335541 (1982-06-01), Kazewych
patent: 4672771 (1987-06-01), Lam et al.
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