Dual cord operating system for an architectural covering
A covering for an architectural opening has a dual cord operating system. The covering may include a head rail, blind panels depending from the head rail, and an operating system. The operating system may include a housing connected to the head rail, a first drive assembly rotatably mounted within the housing and operable to move the blind panels between an extended configuration and a retracted configuration, and a second drive assembly rotatably mounted within the housing and operable to move the blind panels between a closed configuration and an open configuration.
1. A drive assembly for an architectural covering, the drive assembly comprising:
a first pulley;
a second pulley operationally engaged with the first pulley;
a first operating cord passing around the first pulley and extending at least partially in a downward direction for manual actuation; and
a second operating cord passing around the second pulley and extending at least partially in a transverse, longitudinal direction along an architectural structure or feature to actuate the covering to extend or retract across the architectural structure or feature;
wherein the first and second pulleys are coaxial and rotate about a common rotational axis that is oblique in orientation with respect to the downward direction of the first operating cord and the transverse direction of the second operating cord, and wherein the common rotational axis of the first and second pulleys is angled to and extends in same direction as the longitudinal direction of the second operating cord.
2. The drive assembly of claim 1 , further comprising a housing with a sloped surface that alters a direction of the second operating cord from the transverse direction to extend around the second pulley in the oblique orientation.
3. The drive assembly of claim 1 , wherein a first diameter of a first cord groove of the first pulley is greater than a second diameter of a second cord groove of the second pulley to provide a mechanical advantage between the first and second pulleys.
4. The drive assembly of claim 1 , wherein the first pulley is fixed to the second pulley to prevent relative rotation between the first and second pulleys.
5. The drive assembly of claim 1 , further comprising:
a second drive assembly operable to actuate the covering to rotate one or more vanes about a longitudinal axis of each respective vane; and
an operating wand coupled to and extending from the second drive assembly for manual actuation of the second drive assembly.
6. The drive assembly of claim 5 , wherein the downward direction of the first operating cord is coaxial with a longitudinal axis of the operating wand.
7. The drive assembly of claim 1 , further comprising a third pulley that alters a direction of the second operating cord from the transverse direction to extend around the second pulley in the oblique orientation.
8. The drive assembly of claim 7 , wherein:
the third pulley comprises two pulley wheels connected by a shaft; and
a first length of the second operating cord passes over a first of the two pulley wheels and a second length of the second operating cord passes over a second of the two pulley wheels.
9. A drive assembly for an architectural covering, the drive assembly comprising:
a first pulley;
a second pulley operationally engaged with the first pulley;
a first operating cord passing around the first pulley and extending at least partially in a downward direction for manual actuation; and
a second operating cord passing around the second pulley and extending at least partially in a transverse, longitudinal direction along an architectural structure or feature to actuate the covering to extend or retract across the architectural structure or feature;
wherein the first and second pulleys are coaxial and rotate about a common rotational axis;
wherein the common rotational axis is oblique in orientation with respect to the downward direction of the first operating cord and the transverse, longitudinal direction of the second operating cord; and
wherein the common rotational axis of the first and second pulleys is angled to and extends in same direction as the longitudinal direction of the second operating cord.
10. The drive assembly of claim 9 , further comprising a housing with a sloped surface that alters a direction of the second operating cord from the transverse direction to extend around the second pulley in the oblique orientation.
11. The drive assembly of claim 9 , wherein a first diameter of a first cord groove of the first pulley is greater than a second diameter of a second cord groove of the second pulley to provide a mechanical advantage between the first and second pulleys.
12. The drive assembly of claim 9 , wherein the first pulley is fixed to the second pulley to prevent relative rotation between the first and second pulleys.
13. The drive assembly of claim 9 , further comprising a third pulley that alters a direction of the second operating cord from the transverse direction to extend around the second pulley in the oblique orientation.
14. The drive assembly of claim 13 , wherein:
the third pulley comprises two pulley wheels connected by a shaft; and
a first length of the second operating cord passes over a first of the two pulley wheels and a second length of the second operating cord passes over a second of the two pulley wheels.
15. The drive assembly of claim 9 , further comprising:
a second drive assembly operable to actuate the covering to rotate one or more vanes about a longitudinal axis of each respective vane; and
an operating wand coupled to and extending from the second drive assembly for manual actuation of the second drive assembly.
16. The drive assembly of claim 15 , wherein the downward direction of the first operating cord is coaxial with a longitudinal axis of the operating wand.