Roller blind balance regulator and roller blind composed thereof

Disclosed are a roller blind balance regulator and a roller blind composed thereof. The roller blind balance regulator includes a stepped shaft and a friction cylinder, where the stepped shaft is provided with an external thread, the stepped shaft penetrates the friction cylinder, the friction cylinder is provided with an internal thread and is in threaded connection with the stepped shaft, and a friction layer is arranged between the friction cylinder and the stepped shaft. The roller blind includes a roller blind rod, a blind fabric, two mounting members, and the roller blind balance regulator, and a return spring is arranged in the roller blind rod. In the present invention, the roller blind rod drives the friction cylinder to rotate, so that the friction cylinder axially moves along a limiting screw while rotating, thereby increasing or decreasing a friction force between the friction cylinder and the friction layer.

TECHNICAL FIELD

The present invention relates to a roller blind balance regulator and a roller blind composed thereof, belonging to the technical field of household articles.

BACKGROUND

Pull bead roller blinds are more and more used by people, but children are often subjected to some safety hazards due to pull beads. In some places, it is difficult to mount and inconvenient to operate the pull bead roller blind. However, it is impossible to increase costs to mount an electric roller blind, and even no power supply is available in some places. In order to solve these problems, the demand for hand-propelled roller blind systems is increasing. The hand-propelled roller blind system is implemented under the condition of pretightening force of a spring. During use, as a blind body rises or falls, the elastic force of the spring on a roller blind rod is different. In long-term use, when a transmission force of each component changes, it is very difficult to balance the torque, which will seriously affect the use of the roller blind. Therefore, spring systems must be specially designed for the current roller blind systems on the market according to different widths, heights, and even different fabrics. This will result in a large number of specifications, an increase in inventory, and inconvenience in production.

SUMMARY

An object of the present invention is to address at least one of technical problems in the prior art, and provide a roller blind balance regulator and a roller blind composed thereof, which can dynamically balance torque generated by a return spring.

According to an embodiment in a first aspect of the present invention, a roller blind balance regulator is provided, including: a stepped shaft, where a side of a small-diameter section of the stepped shaft is provided with an external thread; and a friction cylinder connected to a roller blind rod, where the stepped shaft penetrates the friction cylinder, the friction cylinder is internally provided with an internal thread, an inner side of the friction cylinder is in threaded connection with the small-diameter section of the stepped shaft, and a friction layer is arranged between the friction cylinder and a large-diameter section of the stepped shaft.

According to an embodiment in the first aspect of the present invention, further, the stepped shaft includes a limiting screw and a mandrel, the mandrel is provided with a mandrel through hole in an axial direction, and the limiting screw penetrates and is fixed in the mandrel through hole.

According to an embodiment in the first aspect of the present invention, further, the inner side of the friction cylinder is provided with a stepped portion, the mandrel is located in the large-diameter section in the friction cylinder, the internal thread is arranged on the small-diameter section in the friction cylinder, an end face of a first end of the mandrel is provided with a first ratchet, and a shoulder of the stepped portion of the friction cylinder is provided with a second ratchet capable of meshing with the first ratchet.

According to an embodiment in the first aspect of the present invention, further, an end face of the friction cylinder is provided with a third ratchet, and the limiting screw is provided with a fourth ratchet capable of meshing with the third ratchet.

According to an embodiment in the first aspect of the present invention, further, an outer side of a second end of the mandrel is provided with an annular protrusion, the annular protrusion is provided with at least one countersunk screw hole, a hole axis of the countersunk screw hole is perpendicular to the limiting screw, and a bolt is inserted into the countersunk screw hole and then abuts against the limiting screw.

According to an embodiment in the first aspect of the present invention, a roller blind is provided, including a roller blind rod, a blind fabric, two mounting members, and a roller blind balance regulator, where the blind fabric is wound around the roller blind rod, two ends of the roller blind rod are mounted on the mounting members, a return spring is arranged in the roller blind rod, a friction cylinder is connected to the roller blind rod, and one end of a stepped shaft is fixed on one of the mounting members.

According to an embodiment in a second aspect of the present invention, a roller blind balance regulator is provided, including a fixing part and a friction cylinder connected to a roller blind rod, where the fixing part includes a sleeve and a center rod fixed in the sleeve, the center rod is arranged in an axial direction of the sleeve, and a space allowing the friction cylinder to be inserted is formed between the sleeve and the center rod; the friction cylinder is inserted in the space between the sleeve and the center rod, the center rod penetrates the friction cylinder, the friction cylinder has an inner side surface and an outer side surface, one of the side surfaces of the friction cylinder is in threaded connection with the fixing part, and a friction layer is arranged between the other side surface of the friction cylinder and the fixing part.

According to an embodiment in the second aspect of the present invention, further, the center rod is provided with an external thread, the inner side surface of the friction cylinder is provided with an internal thread, the friction cylinder is in threaded connection with the center rod, and the friction layer is located between the outer side surface of the friction cylinder and the sleeve.

According to an embodiment in the second aspect of the present invention, further, an inner side of the sleeve is provided with an internal thread, the outer side surface of the friction cylinder is provided with an external thread, the friction cylinder is in threaded connection with the sleeve, and the friction layer is located between the inner side surface of the friction cylinder and the center rod.

According to an embodiment in a third aspect of the present invention, a roller blind is provided, including a roller blind rod, a blind fabric, two mounting members, and a roller blind balance regulator, where the blind fabric is wound around the roller blind rod, two ends of the roller blind rod are mounted on the mounting members, a return spring is arranged in the roller blind rod, a friction cylinder is connected to the roller blind rod, and one end of a fixing part is fixed on one of the mounting members.

In the present invention, the torque of the return spring can be better balanced, and the friction force between the friction cylinder and the friction layer can dynamically compensate for a torque difference of the return spring, thereby having a good use effect. The present invention has the following beneficial effects:

I. The roller blind rod drives the friction cylinder to rotate, and the friction cylinder axially moves along a limiting screw while rotating, thereby increasing or decreasing a friction force between the friction cylinder and the friction layer. When the roller blind rod rotates, the friction cylinder can increase or decrease the friction force between the friction cylinder and the friction layer as the torque of the return spring changes, thereby achieving the function of dynamically balancing the return spring.

II. The roller blind rod drives the friction cylinder to rotate, so that the friction cylinder moves in an axial direction of a fixing part while rotating, thereby increasing or decreasing a friction force between the friction cylinder and the friction layer. When the roller blind rod rotates, the friction cylinder can increase or decrease the friction force between the friction cylinder and the friction layer as the torque of the return spring changes, thereby achieving the function of dynamically balancing the return spring.

DETAILED DESCRIPTION

This section describes the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can visually and vividly understand each technical feature and the overall technical solution of the present invention, but the accompanying drawings cannot be understood as limiting the protection scope of the present invention.

In the description of the present invention, it should be understood that if orientation description is involved, the orientation or position relationship indicated by, for example, “up”, “down”, “front”, “rear”, “left” and “right” is based on the orientation or position relationship shown in the drawings, and these terms are just used to facilitate description of the present invention and simplify the description, but not to indicate or imply that the mentioned apparatus or elements must have a specific orientation and must be established and operated in a specific orientation, and thus, these terms cannot be understood as a limitation to the present invention.

In the description of the present invention, “several” means one or more, and “a plurality of” means more than two. “Greater than”, “less than”, “exceeding”, and the like are understood as excluding this number, and “above”, “below”, “within”, and the like are understood as including this number. “First” and “second” in the description are only for the purpose of distinguishing between technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the sequence relationship of indicated technical features.

In the description of the present invention, unless otherwise explicitly defined, the words such as “setting”, “mounting” and “connection” should be understood in a broad sense, and those skilled in art can properly determine the specific meanings of the above words in the present invention with reference to the specific contents of the technical solution.

Embodiment One

Referring toFIGS.1to4, a roller blind balance regulator in this embodiment includes a limiting screw10, a mandrel20, and a friction cylinder30. The mandrel20is provided with a mandrel through hole in an axial direction, and the limiting screw10penetrates and is fixed in the mandrel through hole. An outer side of a second end of the mandrel20is provided with an annular protrusion22, the annular protrusion22is provided with at least one countersunk screw hole23, and a hole axis of the countersunk screw hole23is perpendicular to the limiting screw10. The annular protrusion22may be integrally formed with the mandrel20. A bolt is screwed into the countersunk screw hole23, and a bottom end of the bolt abuts against the limiting screw10, thereby fixing the relative positions of the mandrel20and the limiting screw10. The mandrel20is inserted in the friction cylinder30. Preferably, the inner side of the friction cylinder30is provided with a stepped portion, the mandrel20is located in a large-diameter section in the friction cylinder30, a small-diameter section of the friction cylinder30is provided with an internal thread, and the friction cylinder30is in threaded connection with the limiting screw10. A friction layer is arranged between the mandrel20and the large-diameter section of the friction cylinder30. The friction layer includes at least one friction plate40. For different return springs, roller blind rods and blind fabrics in the roller blind, the friction plates can be appropriately increased or decreased to ensure that the torque of the return spring can be effectively balanced.

Further, in a preferred implementation, the friction plates40may be long friction plates, there are three or more friction plates, the friction plates40are circumferentially distributed outside the mandrel20, and the friction plates40are equally spaced. In an equivalent implementation, the friction plate40may also be a cylindrical friction plate, and the cylindrical friction plate is sleeved outside the mandrel20. In addition, the friction layer may be directly integrally formed with the outer side surface of the mandrel20.

Further, in a preferred implementation, an end face of a first end of the mandrel20is provided with a first ratchet21, and a shoulder of the stepped portion of the friction cylinder30is provided with a second ratchet31capable of meshing with the first ratchet21. When the blind fabric is completely lowered, the first ratchet21on the mandrel20meshes with the second ratchet31of the friction cylinder30, so as to prevent the blind fabric from continuing to descend or even break away from the roller blind rod. Correspondingly, an end face of the friction cylinder30is provided with a third ratchet32, and the limiting screw10is provided with a fourth ratchet11capable of meshing with the third ratchet32. When the blind fabric is completely wound, the friction cylinder30moves to make the third ratchet32mesh with the fourth ratchet on the limiting screw10, thereby restricting the roller blind rod30from continuing to rotate.

Further, in a preferred implementation, the outer side surface of the friction cylinder30is provided with a length scale in an axial direction. The friction cylinder30is provided with an outer cover50, and the outer cover50is sleeved outside the mandrel20and the friction cylinder30. The outer cover50is fixed on the annular protrusion22of the mandrel20. The outer cover50is aligned with the length scale on the friction cylinder30to determine a relative friction force between the friction cylinder30and the mandrel20at this position, so as to better make adjustments according to different roller blind rods and blind fabrics before use.

Further, in a preferred implementation, at least two convex ribs34are arranged outside the friction cylinder30, and the convex ribs34are arranged in a length direction of the friction cylinder30. When rotating, the roller blind rod is linked with the friction cylinder30through the convex ribs34, thereby driving the friction cylinder30to rotate.

Further, in a preferred implementation, the inner side of the mandrel20is provided with at least one oil groove. The oil groove may be an annular groove, and the annular oil groove is circumferentially arranged inside the mandrel20. Preferably, a plurality of annular oil grooves are arranged at intervals in the axial direction of the mandrel20. In an equivalent alternative implementation, the oil groove may be a straight groove, and preferably, a plurality of straight grooves are arranged in the axial direction of the mandrel20. Lubricating oil is injected into the oil groove so that lubricating oil is present between the mandrel20and the limiting screw10, thereby reducing the noise generated by the collision of the mandrel20and the limiting screw.

The operating principle of the roller blind balance regulator is as follows: When rotating, the roller blind rod drives the friction cylinder30to rotate, and the friction cylinder30moves along the limiting screw10, so that the contact area between the friction cylinder30and the friction plate40on the mandrel20changes, and thus the friction force between the friction cylinder30and the mandrel20changes to dynamically adapt to the torque of the roller blind spring.

The roller blind in this embodiment includes a roller blind rod, a blind fabric, two mounting members, and a roller blind balance regulator, where the blind fabric is wound around the roller blind rod, two ends of the roller blind rod are mounted on the mounting members, a return spring is arranged in the roller blind rod, one end of the return spring is connected to the roller blind rod, and the other end of the return spring is connected to one of the mounting members. The friction cylinder30is connected to the roller blind rod, and one end of the limiting screw10or the stepped shaft is fixed on one of the mounting members.

The operating principle of the roller blind is as follows: After the roller blind rod, the blind fabric and the roller blind balance regulator are mounted, the return spring is pretightened, and the roller blind rod is mounted between the two mounting members. The torque of the return spring is equal to the sum of a gravitational force of the blind fabric and a lower rail and a friction force between the friction cylinder30and the friction plate40. While the blind fabric is pulled down, the roller blind rod rotates and drives the friction cylinder30, and the friction cylinder30moves axially along the limiting screw10while rotating; and the contact area between the friction cylinder30and the friction plate on the mandrel20increases, i.e., the friction force between the friction cylinder30and the friction plate40increases. When the blind fabric descends, the gravitational force of a hanging part of the blind fabric increases, and the torque of the return spring increases. In order to balance the torque of the return spring, the friction force between the friction cylinder20and the friction plate40increases to resist the movement trend of the roller blind rod, so that the blind fabric can stop in the position expected by a user. When the blind fabric descends to a lower limit, the first ratchet21meshes with the second ratchet31to prevent the roller blind rod from continuing to rotate and prevent the blind fabric from falling off from the roller blind rod. In the same way, when the blind fabric rises, the torque of the return spring is reduced, and the friction force between the friction cylinder30and the mandrel20is also reduced. When the blind fabric reaches an upper limit, the third ratchet32meshes with the fourth ratchet11, and the roller blind rod no longer rotates. During the use of the roller blind, as the roller blind rod rotates, the friction force between the friction cylinder30and the friction plate40can always dynamically compensate for the torque generated by the winding or unwinding of the blind fabric and the torque difference of the return spring, thereby achieving very good balance effects.

Embodiment Two

Referring toFIG.5, a roller blind balance regulator in this embodiment differs from Embodiment one only in that the mandrel20and the limiting screw10jointly form an integrally-formed stepped shaft. A small-diameter section of the stepped shaft is provided with a thread, the friction cylinder30is in threaded connection with the small-diameter section of the stepped shaft, and a friction layer is arranged between the friction cylinder30and a large-diameter section of the stepped shaft. This arrangement can prevent the wear caused by the collision between the mandrel20and the limiting screw10and simplify the structure.

Embodiment Three

Referring toFIG.6, a roller blind balance regulator in this embodiment includes a fixing part60and a friction cylinder30connected to a roller blind rod. The fixing part60includes a sleeve62and a center rod61fixed in the sleeve62, the center rod61is arranged in an axial direction of the sleeve62, and a space allowing a friction cylinder30to be inserted is formed between the sleeve62and the center rod61. Optionally, the center rod61may be integrally formed with the sleeve62. The friction cylinder30has an inner side surface and an outer side surface, one of the side surfaces of the friction cylinder30is in threaded connection with the fixing part60, and a friction layer is arranged between the other side surface of the friction cylinder30and the fixing part60. The friction cylinder30is inserted in the space between the sleeve62and the center rod61, and the center rod61penetrates the friction cylinder30. Optionally, the center rod61is provided with an external thread, the inner side surface of the friction cylinder30is provided with an internal thread, and the friction cylinder30is in threaded connection with the center rod61; the friction cylinder30can move along the center rod61, and the friction layer is located between the outer side surface of the friction cylinder30and the sleeve62. The friction layer includes at least one friction plate40. For different return springs, roller blind rods and blind fabrics of different weights in the roller blind, the friction plates can be appropriately increased or decreased to ensure that the torque of the return spring can be effectively balanced.

Further, in a preferred implementation, the friction plates40may be long friction plates, there are three or more friction plates, the friction plates40are circumferentially distributed outside the mandrel20, and the friction plates40are equally spaced. In an equivalent implementation, the friction plate40may also be a cylindrical friction plate, and the cylindrical friction plate is sleeved outside the friction cylinder30. In addition, the friction layer may be directly integrally formed with the outer side surface of the friction cylinder30, or, the friction layer may be integrally formed with the inner side surface of the sleeve62.

Further, in a preferred implementation, at least two convex ribs34are arranged outside the friction cylinder30, and the convex ribs34are arranged in a length direction of the friction cylinder30. When rotating, the roller blind rod is linked with the friction cylinder30through the convex ribs34, thereby driving the friction cylinder30to rotate.

Further, in a preferred implementation, the outer side surface of the friction cylinder30is provided with a length scale in an axial direction. The sleeve62is provided with an outer cover50, and the outer cover50is sleeved outside the sleeve62. The outer side surface of the friction cylinder30is provided with a length scale in an axial direction. The outer cover50is aligned with the length scale on the friction cylinder30to determine a relative friction force between the friction cylinder30and the sleeve62at this position, so as to better make adjustments according to different roller blind rods and blind fabrics before use.

Further, in a preferred implementation, the inner side of the friction cylinder30is provided with at least one oil groove. The oil groove may be an annular groove, and the annular oil groove is circumferentially arranged inside the friction cylinder30. Preferably, a plurality of annular oil grooves are arranged at intervals in the axial direction of the friction cylinder30. In an equivalent alternative implementation, the oil groove may be a straight groove, and preferably, a plurality of straight grooves are arranged in the axial direction of the friction cylinder30. Lubricating oil is injected into the oil groove so that lubricating oil is present between the friction cylinder30and the center rod61, thereby reducing the noise generated by the collision of the friction cylinder30and the center rod61.

The operating principle of the roller blind balance regulator is as follows: When rotating, the roller blind rod drives the friction cylinder30to rotate, and the friction cylinder30moves along the center rod61, so that the contact area between the friction cylinder30and the friction plate40on the inner side of the sleeve62changes, and thus the friction force between the friction cylinder30and the friction plate40changes to dynamically adapt to the torque of the roller blind spring.

In an equivalent alternative to the above implementation, optionally, the outer side surface of the friction cylinder30is in threaded connection with the sleeve62, an inner side of the sleeve62is provided with an internal thread, the outer side surface of the friction cylinder30is provided with an external thread, the friction cylinder30is in threaded connection with the sleeve62, and the friction layer is located between the inner side surface of the friction cylinder30and the center rod61. Preferably, the friction plate40is fixed on the center rod61. The rest of the structure is the same as described above.

The roller blind in this embodiment includes a roller blind rod, a blind fabric, two mounting members, and a roller blind balance regulator, where the blind fabric is wound around the roller blind rod, two ends of the roller blind rod are mounted on the mounting members, a return spring is arranged in the roller blind rod, the friction cylinder30is connected to the roller blind rod, and one end of the fixing part60is fixed on one of the mounting members.

The operating principle of the roller blind is as follows: After the roller blind rod, the blind fabric and the roller blind balance regulator are mounted, the return spring is pretightened, and the roller blind rod is mounted between the two mounting members. The torque of the return spring is equal to the sum of a gravitational force of the blind fabric and a lower rail and a friction force between the friction cylinder30and the friction plate40. While the blind fabric is pulled down, the roller blind rod rotates and drives the friction cylinder30, and the friction cylinder30moves axially along the center rod61while rotating; and the contact area between the friction cylinder30and the friction plate40on the inner side of the sleeve62increases, i.e., the friction force between the friction cylinder30and the friction plate40increases. When the blind fabric descends, the gravitational force of a hanging part of the blind fabric increases, and the torque of the return spring increases. In order to balance the torque of the return spring, the friction force between the friction cylinder20and the friction plate40increases to resist the movement trend of the roller blind rod, so that the blind fabric can stop in the position expected by a user. When the blind fabric rises, the torque of the return spring is reduced, and the friction force between the friction cylinder30and the mandrel20is also reduced. When the blind fabric reaches the upper limit, the friction cylinder30moves to abut against the mounting yard connected to the fixing part, and the roller blind rod no longer rotates. During the use of the roller blind, as the roller blind rod rotates, the friction force between the friction cylinder30and the friction plate40can always dynamically compensate for the torque generated by the winding or unwinding of the blind fabric and the torque difference of the return spring, thereby achieving very good balance effects.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments, and various equivalent modifications or replacements can be made by those skilled in the art without departing from the spirit of the present invention. These equivalent modifications or replacements fall within the scope of the claims of the present application.