The invention is based on a priority application EP 07301154.6 which is hereby incorporated by reference.
The invention relates to a drive unit for a Venetian blind or the like for inserting into a head rail, including an electric motor and output shafts at both ends driven via gear.
Further embodiments of the invention are a Venetian blind or the like including a drive unit installed in a head rail and driving the Venetian blind or the like at both ends of the head rail.
Electrically driven Venetian blinds, roller shutters, cinema screens, and other objects to be wound on to and off a tube mostly are used in rooms where people stay. Often they are operated automatically, and at least then their unexpected operation is considered to be disturbing in consequence of their noise.
It is to be mentioned that not in every application the objects as such are wound on to and off a tube but only drive parts thereof. This does not change the problem.
It is known to acoustically isolate the drives by enclosing the head rails with suitable material. This necessitates additional installation efforts.
The technical problem thus is to reduce the installation efforts.
According to the invention this problem is solved by a drive unit for a Venetian blind or the like for inserting into a head rail, including an electric motor and output shafts at both ends driven via gear, wherein the electric motor is combined with components serving for acoustically damping and uncoupling, that are shaped such that they are insertable into the head rail together with the electric motor.
The invention further relates a Venetian blind or the like including a drive unit installed in a head rail and driving the Venetian blind or the like at both ends of the head rail, wherein the drive unit includes an electric motor that is combined with components serving for acoustically damping and uncoupling, that are shaped such that they are insertable into the head rail together with the electric motor.
The solution mainly is based on measures that are taken before the installation onsite.
Further details and embodiments are to be found in the subclaims and in the following description.
In the following the invention will be described with the aid of the accompanying drawing.
Based on
The electric motor EM here is representative for the proper motor as well as for the gear or gears, a brake, if necessary, and the bearings.
Electric motors for such applications mostly are AC-induction motors for short-time operation with mounted gearboxes. It is cheaper to have gears at both sides of the motor. But it is also known to use only one gear in combination with a hollow shaft through the motor. Depending on the kind of gear or gears also an electromechanical brake may be necessary. At both ends at least one bearing each is necessary. Normally ball bearings are used. A view with more such details is to be seen in
Back to figure where we see three independent measures for acoustically isolating the motor:
As can be seen in
Number | Date | Country | Kind |
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07301154.6 | Jun 2007 | EP | regional |