Transmission mechanism of window covering

• US 9,309,716 B2
• Filed: 08/22/2014
• Issued: 04/12/2016
• Est. Priority Date: 08/22/2014
• Status: Active Grant

• Current Assignee: Nien Made Enterprises Company Limited
• Original Assignee: Nien Made Enterprises Company Limited
• Inventors: Chen, Lin
• Primary Examiner(s): PUROL, DAVID M
• Application Number:
  US14/466,812
• Publication Number:
  US 20160053533A1
• Time in Patent Office: 599 Days
• Field of Search: 160/170, 160/171, 160/84.04, 160/84.05, 160/84.06
• US Class Current: 1/1
• CPC Class Codes: E06B 2009/3222 Cordless, i.e. user interface without cords
• CPC Class Codes: E06B 2009/3225 Arrangements to aid the winding of cords rollers
• CPC Class Codes: E06B 9/322 Details of operating devices, e.g. pulleys, brakes, spring drums, drives operating devices E06B9/68 ; devices of general interest specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material B65H75/34
• CPC Class Codes: E06B 9/324 Cord-locks cord-locks for curtains A47H3/00
• CPC Class Codes: E06B 9/326 Details of cords, e.g. buckles, drawing knobs

Abstract

A transmission mechanism of a window covering includes a first lifting cord set, a second lifting cord set, and a driving cord set. The driving cord set has a cone reel and a control cord, wherein the cone reel has a gradually decreasing dimension, and the control cord winds around the cone reel and has a section left out of the headrail. The first and the second lifting cord sets each has a reel and a lifting cord, wherein the reel is driven by the cone reel, and the lifting cord has opposite ends fastened to the reel and the bottom rail respectively. The cone reel changes a speed and torque of the power transferred to the bottom rail while the user pulls the control cord to lift the bottom cord and the slats of the window covering in an efficient way.

Claims

1. A transmission mechanism of a window covering, wherein the window covering includes a headrail, a bottom rail, and a covering material between the headrail and the bottom rail, comprising:

a first lifting cord set having a first reel and a first lifting cord, wherein the first reel is received in the headrail for rotation, and the first lifting cord has opposite ends fastened to the first reel and the bottom rail respectively;

a second lifting cord set having a second reel and a second lifting cord, wherein the second reel is received in the headrail for rotation, and the second lifting cord has opposite ends fastened to the second reel and the bottom rail respectively; and

a driving cord set having a cone reel and a control cord, wherein the cone reel is received in the headrail for rotation to drive the first reel and the second reel to synchronously rotate, and the control cord winds around the cone reel and has a section left out of the headrail for manipulation to rotate the cone reel,

wherein the driving cord set further has a transmission reel and a transmission cord;

the transmission reel has a reel portion, and the cone reel has a cone portion and a reel portion;

the transmission cord winds around the cone portion of the cone reel and the reel portion of the transmission reel respectively, and the control cord winds around the reel portion of the cone reel, whereby the first reel and the second reel are driven by the cone reel to synchronously rotate while the control cord is pulled or released.

2. The transmission mechanism of claim 1, wherein the first reel has a first barrel and a first gear concentrically connected to the first barrel;

the second reel has a second barrel and a second gear concentrically connected to the second barrel;

the transmission reel further has a third gear concentrically connected to the reel portion thereof; and

the third gear of the transmission reel is meshed with both the first gear of the first reel and the second gear of the second reel.

3. The transmission mechanism of claim 1, wherein the first reel has a first barrel and a first gear concentrically connected to the first barrel;

the second reel has a second barrel and a second gear concentrically connected to the second barrel;

the transmission reel further has a third gear concentrically connected to the reel portion; and

the third gear of the transmission reel is meshed with the second gear of the second reel, and the second gear of the second reel is meshed with the first gear of the first reel.

4. The transmission mechanism of claim 1, wherein the cone portion of the cone reel has a tip end and a butt end, and a diameter of the cone portion decreases from the butt end to the tip end;

and the transmission cord winds around the cone portion in a direction from butt end to the tip end.

5. The transmission mechanism of claim 4, wherein the cone portion of the cone reel is provided with a spiral slot to receive the transmission cord.

6. The transmission mechanism of claim 1, wherein the first reel has a first barrel and a first gear concentrically connected to the first barrel;

the second reel has a second barrel and a second gear concentrically connected to the second barrel;

the cone reel has a cone portion and a gear concentrically connected to the cone portion;

the control cord winds around the cone portion of the cone reel; and

the gear of the cone reel is meshed with both the first gear of the first reel and the second gear of the second reel.

7. The transmission mechanism of claim 1, wherein the first reel has a first barrel and a first gear concentrically connected to the first barrel;

the second reel has a second barrel and a second gear concentrically connected to the second barrel;

the cone reel has a cone portion and a gear concentrically connected to the cone portion;

the control cord winds around the cone portion of the cone reel; and

the gear of the cone reel is meshed with the second gear of the second reel, and the second gear of the second reel is meshed with the first gear of the first reel.

8. The transmission mechanism of claim 1, wherein the first reel has a first barrel and a first gear, and the first barrel and the first gear are concentrically connected together;

the second reel has a second barrel and a second gear, and the second barrel and the second gear are concentrically connected together;

the cone reel further has a gear, which is concentrically connected to the cone portion; and

the gear of the cone reel is indirectly connected to the first gear of the first reel and the second gear of the second reel respectively through intermediate gears.

9. The transmission mechanism of claim 1, wherein the first reel has a first barrel and a first gear, and the first barrel and the first gear are concentrically connected together;

the second reel has a second barrel and a second gear, and the second barrel and the second gear are concentrically connected together;

the cone reel further has a gear, which is concentrically connected to the cone portion; and

the gear of the cone reel is indirectly connected to the first gear of the first reel and the second gear of the second reel respectively through timing belts.

10. The transmission mechanism of claim 1, further comprising a cord locker provided in the headrail, wherein the control cord passes through the cord locker.