# US 2026/0266133 A1 · Roller blind with tensioning device

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- Number: US 2026/0266133 A1
- Document ID: US20260266133A1
- Status: Published application
- Kind: A1
- Application number: 19/489,274
- Filed: 2023-11-21
- Published: 2026-09-10
- Earliest claimed: 2023-06-02
- Assignees: Shanghai Qing Fan Intellectual Sunshade Technology Co., Ltd
- Applicants: Shanghai Qing Fan Intellectual Sunshade Technology Co., Ltd
- Inventors: Haibing KONG
- Web page: https://patentgrep.com/patent/US20260266133A1

## CPC

- E04F 10/0655: {acting on the movable end, e.g. front bar}
- E06B 9/72: comprising an electric motor positioned inside the roller
- E04F 10/0607: {with guiding-sections for supporting the movable end of the blind}
- E04F 10/0648: {acting on the roller tube}
- E06B 9/42: Parts or details of roller blinds, e.g. suspension devices, blind boxes (brackets or adjustable mountings for roller blinds and drawable curtains A47H1/13)
- E04F: FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS (windows, doors E06B)
- E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00)

## Abstract

The provided is a roller blind with a tensioning device, including a power source, a roller, a curtain material, a length-limiting locating element, and a tensioning device; the length-limiting locating element is used to limit the unwinding length of the curtain material, including a positioning roller; the tensioning device includes a driving medium and a driving wheel assembly; the driving wheel assembly includes a driving wheel; the driving medium is ring-shaped and wraps around the driving wheel and the positioning roller; the power source is drive-connected to the roller, and the roller is connected to the driving medium via the driving wheel assembly, ensuring the driving medium to rotate with the roller. The roller is also connected to the driving medium via the curtain material. During the unwinding process, the roller blind can maintain the curtain material to be tensioned, flat, and not drooping.

## Claims

### Claim 1

A roller blind with a tensioning device, wherein the roller blind comprises a power source, a roller, a curtain material, a length-limiting locating element, and a tensioning device; the length-limiting locating element is configured to limit an unwinding length of the curtain material and comprises a positioning roller; the tensioning device comprises a driving medium and a driving wheel assembly; the driving wheel assembly comprises a driving wheel, a pawl and a pawl support shaft; the driving medium is ring-shaped and wraps around the driving wheel and the positioning roller;
the power source is drive-connected to the roller, and the roller is connected to the driving medium via the driving wheel assembly, ensuring the driving medium to rotate with the roller; the roller is further connected to the driving medium via the curtain material;
the tensioning device further comprises a synchronizing device assembly; the synchronizing device assembly comprises a housing, a friction assembly, and a shaft; the synchronizing device assembly is drive-connected to the roller;
the friction assembly comprises a first friction ring and a second friction ring; the shaft passes through the first friction ring and the second friction ring; an inner ring contour of the second friction ring is provided with a second interlocking component that matches an outer contour of the shaft, ensuring the second friction ring to rotate synchronously with the shaft; the first friction ring is in close contact with the second friction ring, and a friction force between the first friction ring and the second friction ring drives the first friction ring and the second friction ring to rotate in the same direction; an outer ring contour of the first friction ring is provided with a first interlocking component matching the inner wall of the housing, ensuring the housing to rotate synchronously with the first friction ring; the synchronizing device assembly is drive-connected to the driving medium via the driving wheel assembly;
the driving wheel is a ratchet gear; ratchets of the ratchet gear are inclined towards the same rotation direction and arranged around an inner circumferential surface of the ratchet gear; a front end of the pawl is positioned within the ratchets of the ratchet gear, and a root of the pawl is arranged on an outer circumferential surface of the pawl support shaft; the driving wheel assembly is configured such that: when a rotational direction of the pawl support shaft is the same as an inclination direction of the ratchets of the ratchet gear, the pawl engages within the ratchets of the ratchet gear, driving the ratchet gear and the pawl support shaft to rotate synchronously in the same direction; when the rotational direction of the pawl support shaft is opposite to the inclination direction of the ratchets of the ratchet gear, the pawl slips within the ratchets of the ratchet gear, and the ratchet gear does not rotate synchronously with the pawl support shaft; the driving wheel assembly only slips when rotating in a winding direction, and when rotating in an unwinding direction, the pawl and the ratchets of the ratchet gear are in a meshing state to push the ratchet gear to rotate; the pawl support shaft is drive-connected to the roller.

### Claim 2 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein the housing of the synchronizing device assembly is drive-connected to the roller; the shaft of the synchronizing device assembly is drive-connected to the driving medium via the driving wheel assembly.

### Claim 3 (depends on 2)

The roller blind with the tensioning device according to claim 2, wherein the housing is integrally formed with the roller.

### Claim 4 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein the shaft of the synchronizing device assembly is drive-connected to the roller; the housing of the synchronizing device assembly is drive-connected to the driving medium via the driving wheel assembly.

### Claim 5 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein the synchronizing device assembly further comprises an adjusting assembly; the adjusting assembly regulates the friction force between the first friction ring and the second friction ring by applying pressure to the friction assembly.

### Claim 6 (depends on 5)

The roller blind with the tensioning device according to claim 5, wherein the adjusting assembly comprises an elastic element; the elastic element controls the pressure applied to the friction assembly through a deformation extent, wherein the friction force between the first friction ring and the second friction ring is regulated.

### Claim 7 (depends on 6)

The roller blind with the tensioning device according to claim 6, wherein the adjusting assembly further comprises a first pressure-applying member; the elastic element transmits the pressure generated by elastic deformation through the first pressure-applying member to the friction assembly.

### Claim 8 (depends on 7)

The roller blind with the tensioning device according to claim 7, wherein an outer contour of the first pressure-applying member is identical to an outer contour of the first friction ring, ensuring the first pressure-applying member to rotate with the housing.

### Claim 9 (depends on 7)

The roller blind with the tensioning device according to claim 7, wherein the first pressure-applying member is ring-shaped; an inner ring contour of the first pressure-applying member is identical to the inner ring contour of the second friction ring, wherein the shaft is configured to rotate with the first pressure-applying member.

### Claim 10 (depends on 7)

The roller blind with the tensioning device according to claim 7, wherein the adjusting assembly further comprises a second pressure-applying member; the first pressure-applying member, the elastic element, and the second pressure-applying member are arranged in sequence.

### Claim 11 (depends on 10)

The roller blind with the tensioning device according to claim 10, wherein the first pressure-applying member and the second pressure-applying member are ring-shaped;
an outer contour of the first pressure-applying member and an outer contour of the second pressure-applying member are both identical to an outer contour of the first friction ring, ensuring the first pressure-applying member and the second pressure-applying member to rotate with the housing; or
an inner contour of the first pressure-applying member and an inner contour of the second pressure-applying member are both identical to an inner contour of the second friction ring, ensuring the shaft to rotate with the first pressure-applying member and the second pressure-applying member.

### Claim 12 (depends on 6)

The roller blind with the tensioning device according to claim 6, wherein the deformation extent of the elastic element is adjusted by a fastener; the fastener comprises an ejector pin; extension and retraction of the ejector pin cause the elastic deformation force acting on the elastic element to change, wherein the deformation extent of the elastic element is adjusted.

### Claim 13 (depends on 12)

The roller blind with the tensioning device according to claim 12, wherein the adjusting assembly further comprises a first pressure-applying member and a second pressure-applying member; the first pressure-applying member, the elastic element, and the second pressure-applying member are arranged in sequence; and the fastener is arranged on the first pressure-applying member and/or the second pressure-applying member.

### Claim 14 (depends on 12)

The roller blind with the tensioning device according to claim 12, wherein the adjusting assembly and the friction assembly are arranged in a space enclosed by a side wall and an end plate of the housing; the ejector pin passes through the end plate of the housing; a first end of the ejector pin abuts the adjusting assembly, and a second end of the ejector pin is exposed on an outer side of the end plate and is provided with a fixture to control a length of the ejector pin extending into an inner side of the end plate.

### Claim 15 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein the first interlocking component is an outwardly extending protrusion, and the inner wall of the housing is provided with a corresponding depression matching the first interlocking component; or the first interlocking component is an inwardly recessed depression, and the inner wall of the housing is provided with a corresponding protrusion matching the first interlocking component; or the first interlocking component comprises both an outwardly extending protrusion and an inwardly recessed depression, the inner wall of the housing is provided with a depression matching the outwardly extending protrusion at a corresponding position of the outwardly extending protrusion and the inner wall of the housing is provided with a protrusion matching the inwardly recessed depression at a corresponding position of the inwardly recessed depression.

### Claim 16 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein a cross-sectional inner wall contour of the housing is not circular, and an outer contour of the first friction ring matches the cross-sectional inner wall contour of the housing, ensuring the first friction ring to rotate with the housing; the first interlocking component is a portion of the outer contour of the first friction ring that matches the inner wall contour of the cross-section of the housing.

### Claim 17 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein the second interlocking component is an inwardly extending protrusion, the outer contour of the shaft is provided with a depression corresponding to the second interlocking component; or the second interlocking component is a depression that extends inward into the ring, and the outer contour of the shaft is provided with a protrusion corresponding to the second interlocking component; or the second interlocking component comprises both an inwardly extending protrusion and a depression that extends inward into the ring, the outer contour of the shaft is provided with a depression corresponding to the inwardly extending protrusion at a corresponding position of the inwardly extending protrusion, and the outer contour of the shaft is provided with a protrusion corresponding to the inwardly recessed depression at a corresponding position of the inwardly recessed depression.

### Claim 18 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein a cross-sectional outer contour of the shaft is not circular, and an inner contour of the second friction ring matches the cross-sectional outer contour of the shaft, ensuring the shaft to rotate with the second friction ring; the second interlocking component is a portion of the inner contour of the second friction ring that matches the outer contour of the cross-section of the shaft, wherein the inner ring contour of the second friction ring matches the outer contour of the cross-section of the shaft.

### Claim 19 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein a number of the first friction rings or second friction rings is greater than 1, and a transmission effect of the housing to the shaft is adjusted by changing a friction area through adjusting an arrangement of the first friction rings and second friction rings.

### Claim 20 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein the power source is set within the roller; a power source's wires pass through the shaft to connect to a power outlet.

### Claim 21 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein the power source has auxiliary wheels at both ends; the driving medium further surrounds the auxiliary wheels; the power source drives the driving mediums via the auxiliary wheels, the driving mediums in turn drive the driving wheel assembly; the driving wheel assembly drives the roller via the synchronizing device assembly, wherein the roller is ensured to rotate and achieve unwinding and/or winding of the curtain material.

### Claim 22 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein the power source is positioned on an axis where the positioning roller is located, driving the positioning roller to rotate, wherein the driving medium is driven to rotate, the driving medium drives the driving wheel assembly, the driving wheel assembly is rotated via the synchronizing device assembly, wherein the roller is driven to rotate and achieve unwinding and/or winding of the curtain material.

### Claim 23 (depends on 1)

The roller blind with the tensioning device according to claim 1, wherein a radius of the curtain material wound on the roller is no greater than a radius of the driving medium on the driving wheel.

### Claim 24

(canceled)

### Claim 25

(canceled)

### Claim 26

(canceled)

### Claim 27

(canceled)

### Claim 28

(canceled)

### Claim 29

(canceled)

### Claim 30

(canceled)

### Claim 31

(canceled)