Geared bracket for a window shade
The geared window shade bracket comprises a sprocket having a ring gear on an inside circumference of the sprocket; a chain configured to be engaged with the sprocket such that, in response to pulling on the chain, the sprocket rotates; a sun gear that is configured to be restricted from rotation; one or more planet gears configured to rotate around the sun gear, wherein the one or more planet gears interface with the ring gear; and a planetary carrier configured to mate with the one or more planet gears. In response to the chain being pulled, the sprocket rotates, causing the planet gears to rotate, causing the planetary carrier to rotate, causing the hub to rotate, and causing a shade tube to rotate.
1. A geared window shade bracket comprising:
a sprocket having a ring gear on an inside circumference of the sprocket;
a chain configured to be engaged with the sprocket such that, in response to pulling on the chain, the sprocket rotates;
a sun gear that is configured to be restricted from rotation;
one or more planet gears configured to rotate around the sun gear, wherein the one or more planet gears interface with the ring gear;
a planetary carrier configured to mate with the one or more planet gears; and
the planetary carrier is also configured to rotate a shade tube,
wherein less than 2 rotations of the sprocket results in 1 rotation of the shade tube.
2. The bracket of claim 1 , wherein the chain is threaded around an outside circumference of the sprocket.
3. The bracket of claim 1 , further comprising one or more bead stops located on the chain.
4. The bracket of claim 1 , further comprising a bead stop located on the chain, wherein the bead stop is restricted from entering the inside of a housing of the bracket.
5. The bracket of claim 1 , wherein the sun gear is configured to be restricted from rotation due to the sun gear including an opening that mates with a shaft.
6. The bracket of claim 1 , wherein the sun gear is configured to be restricted from rotation due to the sun gear including a hexagonal opening that mates with a hexagonal shaft.
7. The bracket of claim 1 , further comprising a clutch and a hub.
8. The bracket of claim 1 , further comprising a wrap spring clutch.
9. The bracket of claim 1 , further comprising a hub that is configured to engage an end of the shade tube.
10. The bracket of claim 1 , wherein the planetary carrier is configured with a brake, wherein the brake is configured to impact a tang on a clutch to open a wrap spring on the clutch which allows the clutch to rotate.
11. The bracket of claim 1 , wherein the ring gear is configured with ring gear threads on at least a portion of an inside circumference of the ring gear.
12. The bracket of claim 1 , wherein the one or more planet gears include planet threads on an outside circumference of the one or more planet gears that interface with ring gear threads on at least a portion of an inside circumference of the ring gear.
13. The bracket of claim 1 , wherein in response to the chain being pulled, the sprocket rotates, causing the planet gears to rotate, causing the planetary carrier to rotate, causing the hub to rotate, and causing the shade tube to rotate.
14. A method comprising determining a maximum gear ratio based on a length of chain in a chain loop and a diameter of a shade tube, wherein the maximum gear ratio allows inclusion of a bead stop on the chain loop, wherein the maximum gear ratio includes less than 2 rotations of a sprocket resulting in 1 rotation of the shade tube, and wherein the length of chain with the bead stop allows for fully lowering and fully raising a window shade around the shade tube.