Cordless Venetian blind structure

• US 20050092446A1
• Filed: 10/29/2003
• Published: 05/05/2005
• Est. Priority Date: 10/29/2003
• Status: Active Grant

• Current Assignee: Leslie Ni
• Original Assignee: Leslie Ni
• Inventors: Ni, Leslie
• Granted Patent: US 6,932,140 B2
• Time in Patent Office: Days
• US Class Current: 160/172.00R
• 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

Abstract

A cordless Venetian blind structure includes a lower beam having a pair of clamps securely sealed at both ends thereof for a left and a right retaining cords to be held thereby before pivotally led through the bottom of the lower beam to be tied up to a windowsill for location thereon. A retaining unit and a control unit are mounted to the middle section of the lower beam respectively with the control unit limited by the retaining unit in pushing operation. A control cord pivotally led through the retaining unit and the control unit respectively at the middle section is attached to the clamps by both ends thereof. In operation, the control unit is pushed inwards to draw in the control cord by both ends and compress spring elements disposed at the clamps therein so as to release the retaining cords from the clamps for adjusting the Venetian blind up or down into a proper position. When the pushing force applied is removed, the clamps are bounced back, clamping tight the retaining cords thereof so as to relocate the Venetian blind at the proper position under the best using condition thereof. Moreover, a pair of coupling bodies can also be attached at both ends of the lower beam thereof with the same effect thereof.

Claims

1-6. -6. (canceled)

7. A cordless Venetian blind structure comprising:

a lower beam having a pair of clamps securely sealed at two ends thereof, each of the pair of clamps selectively engaging one of a left and a right retaining cord inserted through a bottom of the lower beam to be connected to a windowsill;

a retaining unit and a control unit mounted to a middle section of the lower beam, the control unit controlling the retaining unit; and

a control cord inserted through the retaining unit and the control unit and connected at opposing ends thereof to an inner side of each of the pair of clamps;

wherein, in operation, when the control unit is pushed inwards to draw in both ends of the control cord and compress spring elements located in each of the pair of clamps moving the pair of clamps to an open position such that the pair of clamps release the left and right retaining cords for adjusting the Venetian blind up and down to a predetermined position;

when a pushing force is removed, the clamps move to a closed position, clamping tight the retaining cords such that the Venetian blind is held at a predetermined position.

8. The cordless Venetian blind structure as claimed in claim 7, wherein the lower beam has a central through hole located in a front thereof, and a cord passage hole located in the bottom of each of the two ends thereof.

9. The cordless Venetian blind structure as claimed in claim 7, wherein the retaining unit is made up of an abutting board located on a front thereof, a protruded rod with a central passage defined therein extending from a rear thereof, and a pair of extending plates each having a cord hole extending from opposing ends of the rear thereof.

10. The cordless Venetian blind structure as claimed in claim 7, wherein the control unit is equipped with a push head protruding at one end thereof, a pivot hole disposed at the other end thereof, and an insertion rod disposed at the middle section thereof.

11. The cordless Venetian blind structure as claimed in claim 7, wherein each of the pair of clamps has a movable plate and a fixed plate bound by the compress spring element attached between the movable plate and the fixed plate;

a serrated retaining section and a serrated fixing section are located on a corresponding inner side of the movable plate and the fixed plate thereof respectively, clamping tight in mutual engagement via the spring element thereof;

the fixed plate has a closed facet located on an outer surface thereof, and the movable plate thereof has a retaining hole located in the serrated retaining section and having the control cord inserted therein and attached to the movable plate.

12. The cordless Venetian blind structure as claimed in claim 7, wherein the coupling body includes a central through hole and a stop flange disposed at an inner side of the central though hole;

a movable unit having a spring element inserted into the central through hole, the spring element engaging the stop flange;

the movable unit has a cord hole located on a first end with the control cord attached thereto, and a serrated retaining section protruding from a second end of the movable unit;

a pair of sealing covers located on each of the two ends of the lower beam, each of the pair of sealing covers having a serrated fixing section located on one side thereof correspondingly matching the serrated retaining section of the movable unit in clamping engagement for holding one of the left and right retaining cords therein.