Patent Application
20230392441
The present application claims priority to Korean Patent Application No. 10-2022-0068025, filed Jun. 3, 2022, the entire contents of which are incorporated herein for all purposes by this reference.
The present disclosure relates generally to a roller blind drive device in which a curtain fabric is lowered or raised by forward/reverse rotation of a drum, on which the curtain fabric is wound, performed by only a single pull cord. More particularly, the present disclosure relates to a roller blind drive device operated by a single pull cord in which a drive manipulation part which transmits a unidirectional rotational force to a drum control part is simply configured to have only a one-stage clutch structure, thereby reducing labor required for manufacturing, and opposite ends of a roller protrusion part which allow radial inward and outward movements of the drive rollers to be performed while the roller protrusion part revolves the drive rollers are configured to be inclined, and roller teeth are formed on the outer surface of a drive connector which comes into close contact with the drive rollers, thereby preventing slipping between the drive rollers and the drive connector overall and facilitating control of the curtain fabric.
Generally, a roller blind is configured such that a curtain fabric which blocks light is wound on a drum, and the curtain fabric is lowered or raised according to forward/reverse rotation of the drum.
That is, a drive device which transmits forward/reverse rotational force generated by a user to the drum is provided on one side or each of opposite sides of the roller blind.
Such a drive device is basically composed of a pulley connected to the drum so as to rotate same, and a pull cord connected to the pulley so as to receive a rotational force from a user.
Generally, the pull cord connected to the pulley is made in a circular closed type of pull cord, and includes two pull cord strands hanging on the pulley in a loop type toward the lower side of the roller blind.
That is, when a user pulls down one cord strand, the drum is rotated forward and the curtain fabric is lowered, but when a user pulls down the other cord strand, the drum is rotated reversely and the curtain fabric is raised.
As for such a roller blind, two cord strands are connected to each other in a loop type, and unless otherwise indicated, it is impossible to know which strand is responsible for forward/reverse rotation, which causes inconvenience.
In addition, for the convenience of a user's manipulation, the cords are extending up to the lower part of a window by having a relatively long length, and thus when the window is opened, the curtain fabric flaps due to the outside air.
Particularly, there is a serious problem that the pull cord may be wrapped around a person's body due to the intention of a user or the carelessness of children, which may lead to death.
(Patent Document 1) Korean Patent No. 10-1437853 Invention Title: Roller blind for preventing child accident
Accordingly, the present disclosure has been made keeping in mind the above problems occurring in the related art, and the present disclosure is intended to propose a roller blind drive device operated by a single pull cord in which a drive manipulation part which transmits a unidirectional rotational force to a drum control part is simply configured to have a one-stage clutch structure such that man-hours required for manufacturing can be reduced.
In addition, the present disclosure is intended to propose a roller blind drive device in which opposite ends of a roller protrusion part which allows radial inward and outward movements of the drive rollers to be performed while the roller protrusion part revolves the drive rollers are configured to be inclined, and thus the roller protrusion part pushes drive rollers such that the radial inward and outward movements of the drive rollers are performed according to the clockwise/counterclockwise rotation of the drive rollers, thereby facilitating power transmission between the drive guide and the drive rollers.
Furthermore, the present disclosure is intended to propose a roller blind drive device operated by a single pull cord in which roller teeth are formed on the outer surface of a drive connector which comes into close contact with the drive rollers, and the drive rollers are engaged with the roller teeth, thereby preventing slipping between the drive rollers and the drive connector.
Additionally, the present disclosure is intended to propose a roller blind drive device operated by a single pull cord in which a guide wing which comes into contact with a drive casing is formed on the outer surface of the drive guide, and a predetermined resistance is applied to forward revolutions of the drive rollers, thereby facilitating the radial inward movements of the drive rollers along a guide groove part.
In order to achieve the above objectives, according to one aspect of the present disclosure, there is provided a roller blind drive device operated by a single pull cord which lowers or raises a curtain fabric by performing forward/reverse rotation of a drum 3, on which the curtain fabric 2 is wound, by only the single pull cord 1, the drive device including: a drive casing 10 disposed fixedly on one side of the drum 3; a drive manipulation part 20 mounted rotatably inside the drive casing 10 and connected with the pull cord 1 such that the drive manipulation part 20 transmits only a forward rotational force generated by pulling the pull cord 1 to the drum 3 and winds the pull cord 1 such that the pull cord 1 is returned to a raised position; and a drum control part 30 mounted rotatably on an outer part of the drive casing 10 and configured to receive a rotational force from the drive manipulation part 20 and rotate the drum 3, the drum control part 30 being configured to hold the drum 3 or rotate the drum 3 reversely when the rotational force of the drive manipulation part 20 is blocked.
In this case, the drive casing 10 according to the present disclosure may include: a fixed casing 11 supporting the drive manipulation part 20 and the drum control part 30 such that the drive manipulation part 20 and the drum control part 30 are rotatable; a casing cover 12 which is mounted on one side of the fixed casing 11 and restrains the drive manipulation part 20 inside the fixed casing 11 such that the drive manipulation part 20 is rotatable; a closing cover 13 which is mounted on one side of the casing cover 12 and covers the casing cover 12 such that the drive manipulation part 20 is hidden; a passage cover 14 which is inserted into and mounted on a lower side of the fixed casing 11 and covers the lower side of the fixed casing 11 such that the pull cord 1 passes inside and outside of the fixed casing 11; and a protective sleeve 15 which is inserted into and mounted to a center of the passage cover 14 and guides the pull cord 1 such that the pull cord 1 slips into and out of the fixed casing 11.
In addition, the fixed casing 11 according to the present disclosure may include: a casing body 11a having an open side surface which has space to receive the drive manipulation part 20 therein and has a passage having a predetermined size provided on a lower side of the casing body 11a such that the pull cord 1 passes inside and outside of the casing body 11a; a cover protrusion part 11b which protrudes on each of lower opposite sides of the casing body 11a and has a slot in which the passage cover 14 is slidably inserted into and mounted; a drive shaft 11c which protrudes by a predetermined length on a center of the casing body 11a and is inserted into and supports the drive manipulation part 20 such that the drive manipulation part 20 is rotatable; a spring protrusion part 11d which protrudes on a side portion of an outer surface of the drive shaft 11c, and induces a drive spring 22 to be held in the spring protrusion part 11d such that elastic energy is accumulated in the drive manipulation part 20; and a drum shaft 11e which protrudes by a predetermined length on a center of the drive shaft 11c and is inserted into and supports the drum control part 30 such that the drum control part 30 is rotatable.
Furthermore, the drive manipulation part 20 according to the present disclosure may include: a drive wheel 21 which is mounted rotatably to an inner center of the drive casing 10 and allows the pull cord 1 wound on the drive wheel 21 such that the drive wheel 21 receives a forward rotational force from a user; a drive spring 22 which is located between the drive casing 10 and the drive wheel 21 to be connected and mounted thereto, the drive spring 22 being configured to wind the pull cord 1 by rotating the drive wheel 21 reversely; a drive connector 23 which is mounted rotatably to the inner center of the drive casing 10 and is connected to the drum control part 30 so as to transmit a forward rotational force of the drive wheel 21 thereto; drive rollers 24 which are disposed radially between the drive wheel 21 and the drive connector 23 and are selectively engaged with the drive connector 23 while revolving outside of the drive connector 23 along the drive wheel 21 so as to transmit a forward rotational force to the drive connector 23; and a drive guide 25 which receives forward rotational resistance and is rotatably mounted to the inner center of the drive casing 10, the drive guide 25 being configured to guide each of the drive rollers 24 such that the drive rollers 24 are radially moved inward toward and outward from the drive connector 23 while the drive guide 25 rotates along the drive rollers 24.
Additionally, the drive wheel 21 according to the present disclosure may include: a drive wheel body 21a having an outer diameter such that the drive wheel body 21a is mounted in the drive casing 10, and an inner diameter such that the drive wheel body 21a receives the drive connector 23; a spring receiving recess 21b being recessed in a first side of the drive wheel body 21a by having predetermined diameter and depth so as to receive the drive spring 22; a spring protrusion part 21c which protrudes on a side portion of the spring receiving recess 21b and induces the drive spring 22 to be held in the spring protrusion part 21c such that elastic energy is accumulated in the drive spring 22; and roller protrusion parts 21d respectively having arc shapes which are disposed on a second side of the drive wheel body 21a by protruding therefrom such that the roller protrusion parts 21d are disposed at intervals at which the drive rollers 24 are disposed therebetween while the roller protrusion parts 21d cover an outer surface of the drive connector 23, the roller protrusion parts 21d allowing the drive rollers 24 to perform radial inward and outward movements while the roller protrusion parts 21d revolve the drive rollers 24.
In addition, opposite ends of each of the roller protrusion parts 21d according to the present disclosure may be formed to be inclined respectively at predetermined angles such that the roller protrusion parts 21d push the drive rollers 24 so as to allow the drive rollers 24 to be radially moved inward and outward while the roller protrusion parts 21d revolve the drive rollers 24.
Furthermore, according to the present disclosure, a first end of the roller protrusion part 21d may be configured to be inclined at an angle at which an outer portion of the drive roller 24 relative to a center C of the drive roller 24 is in contact with the first end of the roller protrusion part 21d such that the drive roller 24 presses the drive connector 23, and a second end of the roller protrusion part 21d may be configured to be inclined at an angle at which an inner portion of the drive roller 24 relative to the center C of the drive roller 24 is in contact with the second end of the roller protrusion part 21d such that the drive roller 24 is raised outward from the drive connector 23.
Additionally, according to the present disclosure, the drive connector 23 may include: a connector body 23a having an inner diameter such that the connector body 23a receives an inner center portion of the fixed casing 11 and having an outer diameter and a length such that the connector body 23a is inserted into each of the drive wheel 21 and the drum control part 30; roller teeth 23b being disposed on an outer surface of a first side of the connector body 23a by protruding therefrom at intervals at which the roller teeth 23b are engaged with the drive rollers 24 such that slipping between the drive rollers 24 and the drive connector 23 is prevented; and connection teeth 23c being disposed on an outer surface of a second side of the connector body 23a by protruding therefrom at predetermined intervals such that the drive connector 23 is inserted into the drum control part 30 to be engaged therewith.
In addition, according to the present disclosure, the drive guide 25 may include: a guide body 25a having an outer diameter such that the guide body 25a is mounted inside the drive casing 10 and an inner diameter larger than a circumference on which the drive rollers 24 are arranged; a guide groove part 25b being arranged to have a predetermined shape in an inner surface of the guide body 25a by being recessed therefrom according to a number of the arranged drive rollers 24, the guide groove part 25b being configured to guide each of the drive rollers 24 such that the drive roller 24 is radially moved inward toward or outward from the drive connector 23 according to a direction of revolution of the drive roller 24; a guide protrusion part 25c being disposed on a side surface of the guide body 25a by protruding outward therefrom, the guide protrusion part 25c being configured to be engaged with the drive casing 10 and support the guide body 25a such that the guide body 25a is rotatable along the revolution of the drive roller 24; and a guide wing 25d being disposed on an outer surface of the guide body 25a by protruding therefrom toward a forward rotational direction, the guide wing 25d being configured to be in close contact with the drive casing 10 to apply a predetermined resistance to a forward revolution of the drive roller 24 and guide the drive roller 24 such that the drive roller 24 radially moves inward toward the drive connector 23 along the guide groove part 25b.
Furthermore, according to the present disclosure, the guide groove part 25b may include: a pressing surface 25b-1 being recessed at a first side of the guide groove part 25b directed in the forward rotational direction to have a depth smaller than a radius of the drive roller 24 such that the drive roller 24 presses the drive connector 23; a spacing surface 25b-2 being recessed at a second side of the guide groove part 25b directed in a reverse rotational direction to have a depth greater than or equal to the radius of the drive roller 24 such that the drive roller 24 is spaced apart outward from the drive connector 23; and a moving surface 25b-3 being recessed to have a tangential grade between the pressing surface 25b-1 and the spacing surface 25b-2 such that the drive roller 24 slides between the pressing surface 25b-1 and the spacing surface 25b-2.
In addition, according to the present disclosure, the drive guide 25 may further include: an avoidance groove part 25e which is recessed to have a predetermined size in the outer surface of the guide body 25a facing the guide wing 25d and allows bending of the guide wing 25d, and a friction protrusion 25f which protrudes on a side of an outer surface of the guide wing 25d by having a predetermined size and is in close contact with the fixed casing 11 such that friction force which resists the forward revolution of the drive roller 24 is adjusted.
Furthermore, according to the present disclosure, the drum control part 30 may include: a fixed shaft 31 which is mounted on a center of an outer part of the fixed casing 11 and supports the drum 3 such that the drum 3 is rotatable; a drum holder 32 which is rotatably mounted to the fixed shaft 31 and is inserted into and mounted to an end of the drum 3, the drum holder 32 being configured to be connected to the drive manipulation part 20 so as to receive forward rotational force; a cam cylinder 33 which is rotatably mounted between the fixed shaft 31 and the drum holder 32 and controls the drum holder 32 such that the drum holder 32 is held or rotated reversely when forward rotational force of the drive manipulation part 20 is blocked; a steel ball 34 which is disposed between the drum holder 32 and the cam cylinder 33 and is selectively engaged with the cam cylinder 33 by moving left and right while revolving around an outer surface of the cam cylinder 33 along the drum holder 32; a tightening spring 35 which is placed between the fixed shaft 31 and the cam cylinder 33 and changes in diameter according to the rotation of the cam cylinder 33 such that a reverse rotation of the cam cylinder 33 is prevented; and a holder cover 36 which is inserted into and mounted to a center of the drum holder 32 and prevents the fixed shaft 31 and the cam cylinder 33 from being removed from the drum holder 32.
Additionally, according to the present disclosure, the drum control part 30 may further include: a connecting shaft 37 being mounted to a center of an outer part of the fixed casing 11, the connecting shaft 37 being configured to induce mounting of a reducer preventing acceleration of the drum 3 to rotate the drum 3 at a predetermined speed or mounting of a coil spring rotating the drum 3 reversely to automatically wind the curtain fabric 2.
First, according to the present disclosure, the drive manipulation part which transmits a unidirectional rotational force to the drum control part is simply configured to have a one-stage clutch structure, thereby reducing labor required for manufacturing.
Second, according to the present disclosure, opposite ends of a roller protrusion part which allows radial inward and outward movements of the drive rollers to be performed while the roller protrusion part revolves the drive rollers are configured to be inclined, and thus the roller protrusion part pushes drive rollers such that the radial inward and outward movements of the drive rollers are performed according to the forward and reverse rotations of the drive rollers, thereby enabling precise power transmission between the drive guide and the drive rollers.
Third, according to the present disclosure, the roller teeth are formed on the outer surface of the drive connector which comes into close contact with the drive rollers, and the drive rollers are engaged with the roller teeth, thereby preventing slipping between the drive rollers and the drive connector.
Fourth, according to the present disclosure, the guide wing which comes into contact with the drive casing is formed on the outer surface of the drive guide, and a predetermined resistance is applied to forward revolutions of the drive rollers, thereby facilitating the radial inward movements of the drive rollers along the guide groove part.
In addition to the above-described effects, specific effects of the present disclosure will be described together while explaining specific details for carrying out the invention below.
The above and other objectives, features, and other advantages of the present disclosure will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:
Hereinafter, the embodiment of the present document will be described with reference to the accompanying drawings. However, this is not intended to limit the technology described in this document to a specific embodiment, and it should be understood that various modifications, equivalents, and/or alternatives of the embodiment of this document are included. In connection with the description of the drawings, like reference numerals may be used for like components.
In addition, expressions such as “first” and “second” used in this document may modify various elements regardless of order and/or importance, and are used only to distinguish one element from another element but do not limit the corresponding components. For example, “first part” and “second part” may represent different parts regardless of order or importance. For example, without departing from the scope of the claims described in this document, the first component may be named as the second component, and similarly, the second component may also be named as the first component.
In addition, terms used in this document are used only to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. A singular expression may include a plural expression unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meanings as commonly understood by those skilled in the art described in this document. Among the terms used in this document, terms defined in a general dictionary may be interpreted to have the same or similar meaning as meaning in the context of the related art, and unless explicitly defined in this document, are not interpreted as deal or excessively formal meanings. In some cases, even terms defined in this document cannot be construed to exclude the embodiment of the present document.
As illustrated in
In this case, forward rotation mentioned in the present disclosure indicates a direction in which the drum 3 is rotated by the drive manipulation part 20 transmitting a rotational force to the drum control part 30 when the pull cord 1 is pulled down by a user.
That is, the drive device of the present disclosure may be configured such that the drum 3 is rotated clockwise or counterclockwise when the pull cord 1 is pulled down according to the method of lowering and raising the curtain fabric 2.
The method of lowering and raising the curtain fabric 2 will be described in detail together with the drum control part 30 to be described later.
Hereinafter, in order to help the understanding of the present disclosure, the description of the present disclosure will be limited to the drive device in which the drum 3 is rotated clockwise when the blind is viewed from the right side relative to
First, as illustrated in
As illustrated in
The fixed casing 11 is fixedly mounted to the right side of the blind and supports the drive manipulation part 20 and the drum control part 30 such that the drive manipulation part 20 and the drum control part 30 can rotate.
The casing cover 12 is mounted to a side of the fixed casing 11 and restricts a drive wheel 21 and a drive spring 22 to be described later in the fixed casing 11 such that the drive wheel 21 and the drive spring 22 can rotate.
The closing cover 13 is mounted to a side of the casing cover 12 and restricts drive rollers 24 to be described later inside the fixed casing 11 such that the drive rollers 24 can revolve.
The passage cover 14 is inserted into and mounted to the lower side of the fixed casing 11, and covers a passage through which the pull cord 1 passes inside and outside of the fixed casing 11.
The protective sleeve 15 is inserted into and mounted to the center of the passage cover 14, and guides the pull cord 1 such that the pull cord 1 slidably moves inside and outside the fixed casing 11.
In this case, as illustrated in
The casing body 11a is configured as a body having an open side surface which has space in which the drive manipulation part 20 can be received.
The passage having a predetermined size is formed on the lower end of such a casing body 11a such that the pull cord 1 wound on the drive wheel 21 passes inside and outside of the casing body.
The cover protrusion part 11b is formed by protruding on each of the opposite sides of the passage formed on the lower end of the casing body 11a, and is provided with a slot into the passage cover 14 is slidably inserted to be mounted to the cover protrusion part 11b.
The drive shaft 11c protrudes in a cylindrical shape at the center of the casing body 11a, and is inserted into the center of each of the drive wheel 21 and a drive connector 23 to be described later and supports the drive wheel 21 and the drive connector 23 such that the drive wheel 21 and the drive connector 23 can rotate.
The fixing protrusion part 11d protrudes on a side portion of the outer surface of the drive shaft 11c, and is coupled to and holds a first end of the drive spring 22 such that elastic energy is accumulated.
The drum shaft 11e protrudes on the center of the drive shaft 11c by having an angular shape and is inserted into the center of each of a fixed shaft 31 and a connecting shaft 37 to be described later so as to support a drum holder 32 such that the drum holder 32 can rotate.
Meanwhile, for convenience of assembly, each of the passage cover 14 and the protective sleeve 15 may be configured to be divided into opposite sides relative to a center thereof.
Next, the drive manipulation part 20 according to the present disclosure is rotatably mounted inside the drive casing 10 as illustrated in
That is, the drive manipulation part 20 is connected to the pull cord 1 and transmits only forward rotational force generated by a user's pulling to the drum 3.
In addition, when a user's pulling is released, the pull cord 1 is wound to return to a raised position.
As illustrated in
The drive wheel 21 is rotatably mounted to the drive shaft 11c, and the pull cord 1 is wound on the outer surface of the drive wheel 21 so as to receive forward rotational force from a user.
That is, when a user pulls the pull cord 1 down, the drive wheel 21 rotates clockwise when viewed from the right side relative to
In addition, when a user releases the pull cord 1, the drive wheel 21 rotates counterclockwise due to the drive spring 22 when viewed from the right side.
Here, as illustrated in
The drive wheel body 21a is configured to have a disk shape by having an outer diameter to allow the drive wheel body 21a to be mounted in the fixed casing 11, and an inner diameter to allow the drive connector 23 to be received in the drive wheel body 21a.
The spring receiving recess 21b is recessed in the right side of the drive wheel body 21a by having predetermined diameter and depth and receives the drive spring 22.
The spring protrusion part 21c protrudes on one side of the spring receiving recess 21b and is coupled to and holds a second end of the drive spring 22 such that elastic energy is accumulated.
The roller protrusion parts 21d are disposed on the left side of the drive wheel body 21a by protruding therefrom to have arc shapes such that the roller protrusion parts 21d are disposed at intervals at which the drive rollers 24 are disposed therebetween while the roller protrusion parts 21d cover the outer surface of the drive connector 23.
Such roller protrusion parts 21d allow the drive rollers 24 to perform radial inward and outward movements while the roller protrusion parts 21d revolve the drive rollers 24 by operating in cooperation with the drive guide 25.
Here, each of the opposite ends of each of the roller protrusion parts 21d is configured to be inclined at a predetermined angle, and revolves the drive rollers 24 and pushes the drive rollers 24 such that the radial inward and outward movements of the drive rollers 24 are performed as illustrated in
For reference,
That is, the left end part of the roller protrusion part 21d directed in a forward rotational direction is configured to be inclined at an angle at which an outer portion of each of the drive rollers 24 relative to the center C of the drive roller 24 is in contact with the left end part of the roller protrusion part 21d.
In addition, the right end part of the roller protrusion part 21d directed in a reverse rotational direction is configured to be inclined at an angle at which an inner portion of each of the drive rollers 24 relative to the center C of the drive roller 24 is in contact with the right end part of the roller protrusion part 21d.
Accordingly, when the drive wheel 21 is rotated clockwise by a user pulling the pull cord 1 down when viewed from the right side of the blind, the roller protrusion parts 21d press the drive rollers 24 as illustrated in
Contrarily, when the drive wheel 21 is rotated counterclockwise by a user releasing the pull cord 1 when viewed from the right side of the blind, the roller protrusion parts 21d raise the drive rollers 24 as illustrated in
The drive spring 22 is inserted into and mounted in the spring receiving recess 21b, and the opposite ends of the drive spring 22 are coupled to the fixing protrusion part 11d and the spring protrusion part 21c, respectively.
That is, when the drive wheel 21 rotates clockwise by a user pulling the pull cord 1 down, the drive spring 22 accumulates elastic force by which the drive spring 22 is rotated counterclockwise.
Furthermore, when a user releases the pull cord 1, the elastic force accumulated in the drive spring 22 is applied to the drive wheel 21, and the drive wheel 21 is rotated counterclockwise when viewed at the right side of the blind.
Here, when the drive wheel 21 rotates counterclockwise, the pull cord 1 unwound from the drive wheel 21 is wound thereon and a handle connected to the end of the pull cord 1 is returned to a raised position.
Accordingly, even if a window is left open, the flapping of the pull cord 1 hanging down long as in a prior art is minimized.
The drive connector 23 is rotatably mounted to the drive shaft 11c and is connected to the drum holder 32 to be described later so as to transmit the forward rotational force of the drive wheel 21 thereto.
As illustrated in
The connector body 23a is configured to have a cylindrical shape having an inner diameter to receive the drive shaft 11c and an outer diameter for the connector body 23a to be inserted inside the roller protrusion parts 21d and into the drum holder 32.
The roller teeth 23b are disposed on the right outer surface of the connector body 23a, on which the drive wheel 21 is located, by protruding from the right outer surface at intervals at which the roller teeth 23b can be engaged with the drive rollers 24.
As illustrated in
The connection teeth 23c are disposed by protruding at predetermined intervals from the outer surface of the left side of the connector body 23a on which the drum holder 32 is located such that the connector body 23a is inserted into the drum holder 32 to be engaged therewith.
The drive rollers 24 are disposed radially between the outer surface of the drive connector 23 and the roller protrusion parts 21d.
Such drive rollers 24 revolve outside of the drive connector 23 according to the rotation of the drive wheel 21 and are selectively engaged with the drive connector 23 so as to transmit forward rotational force to the drive connector 23.
The drive guide 25 is mounted in the inner center of the drive casing 10 such that the drive guide 25 receives rotational resistance only for forward rotation thereof and rotates in forward and reverse directions.
That is, the drive guide 25 rotates along the drive rollers 24 and provides paths through which the drive rollers 24 radially move inward toward and outward from the drive connector 23.
As illustrated in
The guide body 25a is configured to have a ring shape by having an outer diameter such that the guide body 25a is mounted inside the fixed casing 11 and an inner diameter larger than a circumference on which the drive rollers 24 are arranged.
The guide groove part 25b is arranged to have a predetermined shape in the inner surface of the guide body 25a by being recessed therefrom according to the number of the arranged drive rollers 24.
That is, as illustrated in
Such a guide groove part 25b includes a pressing surface 25b-1, a spacing surface 25b-2, and a moving surface 25b-3.
The pressing surface 25b-1 is disposed at the left side of the guide groove part 25b directed in the forward rotational direction of the drive wheel 21, and is recessed to have a depth smaller than the radius of the drive roller 24.
The spacing surface 25b-2 is disposed at the right side of the guide groove part 25b directed in the reverse rotational direction of the drive wheel 21, and is recessed to have a depth greater than or equal to the radius of the drive roller 24.
The moving surface 25b-3 is recessed to have a tangential grade between the pressing surface 25b-1 and the spacing surface 25b-2 such that the drive roller 24 slides between the pressing surface 25b-1 and the spacing surface 25b-2.
That is, the pressing surface 25b-1 blocks the drive roller 24 revolving along the roller protrusion part 21d and changes the direction of the drive roller 24 such that the drive roller 24 presses the drive connector 23.
In addition, the spacing surface 25b-2 provides avoiding space such that the drive roller 24 is raised from the drive connector 23.
The guide protrusion part 25c is disposed on the left side surface of the guide body 25a by protruding outward therefrom such that the guide protrusion part 25c is stepped.
Such a guide protrusion part 25c is engaged with the casing cover 12 and supports the guide body 25a from the casing cover 12 such that the guide body 25a can rotate according to the revolutions of the drive rollers 24.
The guide wing 25d is disposed on the outer surface of the guide body 25a by protruding to have an arc shape in the forward rotational direction.
Here, the guide wing 25d protrudes from the guide body 25a by having an involute curve shape, and only an end portion of the guide wing 25d is in close contact with the inner surface of the casing cover 12.
That is, when the guide body 25a rotates forward while the guide wing 25d is in close contact with the inner surface of the casing cover 12, that is, when the guide body 25a rotates counterclockwise as illustrated in
Contrarily, in the reverse rotation of the guide body 25a, a force by which the guide wing 25d is bent inward is generated.
Accordingly, the guide wing 25d blocks the forward revolution of the drive roller 24 and allows the drive roller 24 to be forcibly introduced into the pressing surface 25b-1 from the spacing surface 25b-2.
In this case, the drive guide 25 may further include an avoidance groove part 25e and a friction protrusion 25f.
The avoidance groove part 25e is recessed to have a predetermined size in the outer surface of the guide body 25a facing the guide wing 25d and allows the bending of the guide wing 25d.
The friction protrusion 25f protrudes on a side of the outer surface of the guide wing 25d by having a predetermined size and is directly in close contact with the inner surface of the casing cover 12.
Such a friction protrusion 25f facilitates the adjustment of friction force that resists the forward revolutions of the drive rollers 24.
That is, when the friction force which resists the forward revolutions is excessively large, force to pull the pull cord 1 also increases, and noise and thermal deformation may occur during the revolutions of the drive rollers.
Accordingly, it is preferable that only friction force to allow the drive roller 24 to be introduced into the pressing surface 25b-1 from the spacing surface 25b-2 is generated.
However, since it is difficult to manufacture the guide wing 25d with a designed friction coefficient due to errors occurring in a manufacturing process, modification to the outer surface of the guide wing 25d or the inner surface of the casing cover 12 inevitably occurs as needed.
That is, when the friction protrusion 25f is formed on a side of the outer surface of the guide wing 25d, only the friction protrusion 25f having a relatively small size is required to be modified, so it is easy to manufacture the guide wing 25d with a desired friction coefficient.
Hereinafter, the operation process of the drive manipulation part 20 will be described with reference to
For reference,
That is, when a user pulls the pull cord 1 down by gripping the pull cord 1, a wound pull cord 1 is unwound and the drive wheel 21 is rotated counterclockwise as illustrated in
While the drive rollers 24 revolve counterclockwise along the drive wheel 21, the drive rollers 24 radially move inward toward the outer surface of the drive connector 23 due to the drive guide 25.
Due to the radial inward movements of the drive rollers 24, the drive connector 23 and the drive rollers 24 are engaged with each other, and thus the drive connector 23 is also rotated counterclockwise according to the revolutions of the drive rollers 24.
Here, after the radial inward movements of the drive rollers 24, the drive guide 25 is also rotated counterclockwise along the drive rollers 24.
Accordingly, while the drum 3 mounted to the drum holder 32 is also rotated counterclockwise together with the drum holder 32 connected to the drive connector 23, the curtain fabric 2 is lowered.
In this case, when a user releases the pull cord 1 held by the user, the drive wheel 21 is rotated clockwise by the drive spring 22, and the unwound pull cord 1 is wound as illustrated in
Here, while the drive rollers 24 revolve clockwise along the drive wheel 21, the drive rollers 24 radially move outward toward the outside of the drive connector 23.
With the radial outward movements of the drive rollers 24, the drive connector 23 and the drive rollers 24 are disengaged from each other, and the drive connector 23 is maintained to be stationary.
Likewise, after the radial outward movements of the drive rollers 24, the drive guide 25 rotates clockwise along the drive rollers 24.
Accordingly, the drive wheel 21 is disconnected from the drum holder 32, which does not impact the returning operation of the pull cord 1 and the reverse rotation of the drum holder 32.
Next, the drum control part 30 according to the present disclosure is mounted rotatably to the outer part of the drive casing 10 as illustrated in
That is, the drum control part 30 receives a rotational force from the drive manipulation part 20 and rotates the drum 3 forward to lower the curtain fabric 2
In addition, when the rotational force of the drive manipulation part 20 is blocked, the drum 3 is held or is rotated reversely to automatically raise the curtain fabric 2.
As illustrated in
The fixed shaft 31 is mounted over the drum shaft 11e, and supports the drum holder 32 such that the drum holder 32 can rotate.
The drum holder 32 is inserted into an end of the drum 3 so as to rotate therewith and is rotatably mounted to the fixed shaft 31.
A connector groove is formed in the center of a side of the drum holder 32 such that the drive connector 23 is inserted into the connector groove.
That is, the drum holder 32 is connected with the drive connector 23 and receives a forward rotational force from a user.
In addition, a steel ball groove is formed in the inner surface of the drum holder 32 by being recessed horizontally in a left-to-right direction such that the steel ball 34 is received in the steel ball groove such that the steel ball 34 can slide in left and right directions.
The cam cylinder 33 is rotatably mounted between the fixed shaft 31 and the drum holder 32.
That is, the cam cylinder 33 controls the drum holder 32 such that the drum holder 32 is held or rotated counterclockwise when clockwise rotational force is blocked from a user.
Here, a cut groove is formed in one end of the cam cylinder 33 such that an end part of the tightening spring 35 is coupled to the cut groove.
The steel ball 34 is disposed between the drum holder 32 and the cam cylinder 33 and is selectively engaged with the cam cylinder 33 while revolving around the outer surface of the cam cylinder 33 along the drum holder 32.
The tightening spring 35 is placed between the fixed shaft 31 and the cam cylinder 33 and changes in diameter according to the rotation of the cam cylinder 33 such that the reverse rotation of the cam cylinder 33 is prevented.
That is, when the drum holder 32 rotates clockwise, the tightening spring 35 rotates clockwise with the cam cylinder 33 on the fixed shaft 31.
In addition, when the drum holder 32 rotates counterclockwise, the tightening spring 35 presses the outer surface of the fixed shaft 31 and prevents the counterclockwise rotation of the cam cylinder 33.
The holder cover 36 is inserted into and mounted to the center of the drum holder 32 and prevents the fixed shaft 31 and the cam cylinder 33 from being removed from the drum holder 32.
The connecting shaft 37 is fixedly mounted to the drum shaft 11e and induces a reducer or a coil spring connected to the drum 3 to be fixedly mounted thereto.
In this case, a control groove having a predetermined pattern is formed in the outer surface of the cam cylinder 33 such that the steel ball 34 is selectively fitted into the control groove such that the drum holder 32 is held or is rotated counterclockwise.
As illustrated in
The holding groove 33a is recessed to have a “?” shape on the right side of the outer surface of the cam cylinder 33 and restrains the steel ball 34 from revolving in clockwise and counterclockwise directions.
The rotation groove 33b is recessed to have a “<” shape from the lower side of the holding groove 33a on the left side of the outer surface of the cam cylinder 33 and allows the steel ball 34 to revolve counterclockwise.
The transferring groove 33c is recessed to have an “L” shape on the upper side of the holding groove 33a and the rotation groove 33b to communicate therewith and allows the steel ball 34 to escape from the holding groove 33a to the rotation groove 33b.
That is, when a user pulls the pull cord 1 and the drum holder 32 rotates clockwise, the steel ball 34 is restrained by moving upward along the marked path of the holding groove 33a as illustrated in
In addition, when a user releases the pull cord 1, the drum holder 32 immediately rotates counterclockwise, and the steel ball 34 moves downward and is restrained as illustrated in
A reason for which the drum holder 32 rotates reversely will be described in the method of lowering and raising the curtain fabric 2 to be described later.
In this case, when a user pulls the pull cord 1 slightly and the drum holder 32 rotates clockwise, the steel ball 34 escapes to the upper side of the rotation groove 33b along the marked path of the transferring groove 33c as illustrated in
When the steel ball 34 is located in the rotation groove 33b, the steel ball 34 continuously revolves from the lower side to the upper side and from the upper side to the lower side along the marked path of the rotation groove 33b as illustrated in
That is, the drum holder 32 continues to rotate counterclockwise until the winding of the curtain fabric 2 is completed or until a user pulls the pull cord 1.
Meanwhile, the drive device of the present disclosure may be configured to be divided into a drive device of clockwise rotation and a drive device for counterclockwise rotation as described above.
That is, the drive device for clockwise rotation is applied to a method in which the curtain fabric 2 is manually lowered and automatically raised, and the drive device for counterclockwise rotation is applied to a method in which the curtain fabric 2 is automatically lowered and manually raised.
First, in the method of lowering manually and raising automatically the curtain fabric 2, the coil spring is mounted inside the drum 3 so as to wind up the curtain fabric 2 by rotating the drum 3 counterclockwise.
That is, when a user pulls the pull cord 1, the drum 3 rotates clockwise, and the curtain fabric 2 wound on the drum 3 is unwound as much as the pull cord 1 is pulled and moves down.
In addition, when a user releases the pull cord 1, the forward/reverse rotation of the drum 3 is blocked by the cam cylinder 33, and the curtain fabric 2 is held at a preset height.
Next, when a user pulls the pull cord 1 slightly and releases the pull cord 1, the drum 3 rotates counterclockwise by the coil spring, and the curtain fabric 2 is wound on the drum 3 and is automatically raised completely.
Second, in the method of lowering automatically and raising manually the curtain fabric 2, a weight is mounted on an end of the curtain fabric 2 such that the curtain fabric 2 is unwound down by rotating the drum 3 clockwise by gravity.
That is, when a user pulls the pull cord 1, the drum 3 rotates counterclockwise, and the curtain fabric 2 unwound on the drum 3 is wound up as much as the pull cord 1 is pulled.
Furthermore, when a user releases the pull cord 1, the forward/reverse rotation of the drum 3 is blocked by the cam cylinder 33, and the curtain fabric 2 is held at a preset height.
Next, when a user pulls the pull cord 1 slightly and releases the pull cord, the drum is rotated clockwise by the weight, and the curtain fabric is unwound on the drum and is automatically lowered completely.
In the above, the exemplary embodiment of the present disclosure has been illustrated and described, but the present disclosure is not limited to the specific embodiment described above. Various modifications of the embodiment may be made by those of ordinary skill in the technical field to which the invention belongs without departing from the gist of the present disclosure claimed in the claims. These modified embodiments should not be individually understood from the technical spirit or prospect of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2022-0068025 | Jun 2022 | KR | national |
