Patent Application
20080314533
The present invention relates to a device for controlling a winding speed of a winding roll for a screen or shade, which effectively controls the winding speed of the winding roll installed in an outer shell to resiliently wind the screen or shade.
This application claims the benefit of Korean Patent Application No. 2005-38087 filed on May 6, 2005, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
In general, a screen or shade is installed on a window or door to block insects or sunlight. These days, automatic-winding shade or screen featuring a winding roll that resiliently winds or unwinds the shade or screen by resilience of a torsion spring wound around a winding shaft inside a winding box has been developed and well utilized.
A However, such a winding roll winds the screen or shade too slowly or stops the screen or shade in the middle if the torsion spring has weak resilience. On the contrary, if the torsion spring has strong resilience, the winding roll winds up the screen or shade too fast, causing a collision of a handle at the lower end of the screen or shade into the winding box. This increases the breakdown rate and generates noise.
With the aim of solving the above problem, Korean patent No. 0439693 (registered on Jul. 12, 2004) entitled “Device for Adjusting the Springs for Nets of Windows for Protecting Invasion of Insects” has been filed and published prior to this application.
As shown in
The housing 300 has a fastening hole 410 receiving an upper part of the winding shaft 210 in the inside thereof, and a gear bundle 400 consisting of a lower large-circumference flat gear 420 and an upper small-circumference ratchet gear 430 integrally formed therein. Further, an adjustment flap 500 is seated on the guide groove 311 of the housing 300. The adjustment flap 500 has a click 510 adjacent to the ratchet gear 430 so that the ratchet gear 430 is in mesh with the click 510, and a protrusion 520 disposed in the opening 310 of the housing 300 (
In such a device for adjusting the springs for screens of windows for blocking insects, as shown in
Thus the winding speed of the winding shaft 210 is increased to roll up the insect-blocking net 110 faster. Conversely, as shown in
However, in such a device for adjusting the springs for the insect-blocking net, rotating the large-circumference flat gear 420 clockwise to tighten the spring to increase resilience results in the small-circumference ratchet gear 430 rotating intermittently as it has friction with the click 510 of the adjustment flap 500, thus hindering the user from quickly increasing the winding speed of the winding shaft 210. Further, not only the constituting parts have shorter lifetime due to repeated friction and accelerated abrasion, but also noise is generated.
In contrast, pushing the adjustment flap 500 to loosen the spring to decrease resilience results in the click being out of mesh with the small-circumference ratchet gear 430, and the large-circumference flat gear 420 is instantly rotated counter-clockwise due to restoring force of the spring. The spring is loosened completely, having no resilience, thus hindering the user from properly decreasing the winding speed of the winding shaft 210. Thus, the user has to bear with the inconvenience of rotating the large-circumference flat gear 420 to tighten the loosened spring over again.
The present invention has been made to solve the foregoing problems of the prior art and it is therefore an object of the present invention to provide a high-quality device for controlling a winding speed of a winding roll for a screen or shade in which the resilience of a torsion spring is adjusted by worm gear driving method to adjust the winding speed of the winding roll so that there is no mechanical friction generated between the constituent parts.
It is another object of the invention to provide a device for controlling a winding speed of a winding roll for a screen or shade in which the resilience of a torsion spring is adjusted by worm gear driving method to adjust the winding speed of the winding roll so that its operational capability is significantly improved.
According to an aspect of the invention for realizing the object, there is provided a device for controlling a winding speed of a winding roll for a screen or shade including:
an outer shell;
a torsion spring wound on a winding shaft installed inside the outer shell;
a winding roll installed around the winding shaft to resiliently rotate by the torsion spring;
a worm wheel integrally formed with a shaft supporting part, receiving an end of the winding shaft;
a worm in mesh with the worm wheel, wherein an end of the worm wheel is rotatably in contact with an inner side of a stopper plate enclosing a side of the outer shell; and
an adjustment member disposed horizontally adjacent to the worm wheel and perpendicular to the winding shaft, having a front end penetrating through a front portion of the outer shell to the outside, wherein the worm is integrally formed in a middle part in a longitudinal direction of the adjustment member to be in mesh with the worm wheel.
In the present invention, the resilience of a torsion spring is adjusted by a worm gear to increase or decrease a winding speed of a winding roll. Therefore, the invention allows the user to adjust the winding speed of the winding roll quickly, quietly and more conveniently while extending lifetime of the device.
In the present invention, there is provided a device for controlling a winding speed of a winding roll for a screen or shade including:
an outer shell;
a torsion spring wound on a winding shaft installed inside the outer shell;
a winding roll installed around the winding shaft to resiliently rotate by the torsion spring;
a worm wheel integrally formed with a shaft supporting part, receiving an end of the winding shaft;
a worm in mesh with the worm wheel, wherein an end of the worm wheel is rotatably in contact with an inner side of a stopper plate enclosing a side of the outer shell; and
an adjustment member disposed horizontally adjacent to the worm wheel and perpendicular to the winding shaft, having a front end penetrating through a front portion of the outer shell to the outside, wherein the worm is integrally formed in a middle part in a longitudinal direction of the adjustment member to be in mesh with the worm wheel.
A device for controlling a winding speed of a winding roll for a screen or shade according to the present invention shares the technical concept with a conventional one in that a winding speed of a winding roll 2 resiliently rotated around a winding shaft 3 is controlled using a torsion spring B wound on the winding shaft 3 installed inside an outer shell 1.
In addition to the above features, as shown in
In a preferred embodiment, the basic configuration of the invention includes an outer shell 1 having an empty space therein, a winding roll 2 for winding up or down a window screen or shade A, a winding shaft 3 for resiliently rotating the winding roll 2 and a torsion spring B. These are basic components identical to those of the prior art, and thus a detailed explanation on them will be omitted. Therefore, the following explanation will be centered on the technical features of the present invention including a shaft supporting part 4, a worm 6, a worm wheel 5, an adjustment member 7, and a stopper plate 8.
As shown in
As shown in
Thus, the gear teeth 61 of the worm 6 are in mesh with the torsion gear teeth 51 of the worm wheel 5. Here, the adjustment member 7 can be operated by an end penetrating to the outside through an opening 11 formed in a front portion of the outer shell. When the adjustment member 7 is operated by the end penetrated through the front portion of the outer shell 1, the worm wheel 5 in conjunction with the worm 6 rotates the winding shaft 3 which is received in the shaft supporting part 4 integrally formed with the worm wheel 5, thereby adjusting the resilience of the torsion spring B.
In addition, a circular insertion plate 52 is protruded from an end of the worm wheel 5, and an insertion recess 81 is formed in a center of an inner surface of the stopper plate 8 enclosing one side of the outer shell 1. The circular insertion plate 52 of the worm wheel 5 is fitted into the insertion recess 81 of the stopper plate 8, so that the shaft supporting part 4 and the winding shaft 3 rotate freely in conjunction with the worm wheel 5. Here, the stopper plate 8 is fastened to an end of the outer shell 1 with a plurality of fastening screws 83 inserted through holes 82 formed in the upper and lower portions of the stopper plate 8.
In addition, it is preferable that the leading end of the worm wheel 5 is fixed by a vertical fixing plate 9 which is fitted around an outer surface of the shaft supporting part 4 through an opening formed in a center thereof and which is butted against fixing pillars 84 protruded from an inner surface of the stopper plate 8 and fastened to the stopper plate 8 by fixing screws 92 penetrating through the vertical fixing plate 4 and the fixing pillars 84, thereby allowing the worm wheel 5 to rotate freely and stably in position without play.
Moreover, the upper end of the worm 6 is fixed by a fixing flap 85 which is laterally protruded from an upper part of the stopper plate 8 and fitted into a recess 93 formed on an upper end of the vertical fixing plate 9, allowing the adjustment member 7 and the worm 6 to rotate freely and stably in position without play.
Here, it is preferable that annular grooves 71 are formed on opposed sides next to the worm 6 located in the center of the adjustment member 7, and bumps 94 protruded from the upper part of the inner surface of the vertical fixing plate 9 are fitted into the grooves 71 of the adjustment member 7, allowing the worm 6 to rotate precisely without moving back and forth.
The preferred embodiment exemplifies that a tool groove 72 is formed on a front end of the adjustment member 7 so that the adjustment member 7 can be operated by a tool such as a driver. But if necessary, as shown in a variation in
Now, the operation of the device for controlling the winding speed of the winding roll for a screen or shade will be explained hereinbelow.
At ordinary times, the winding shaft 3 tends to rotate back by the resilience of the torsion spring B. But because the worm wheel 5 formed integrally with the shaft supporting part 4 coupled with the winding shaft 3 is in mesh with the worm integrally formed in a middle portion of the adjustment member 7, the winding shaft 3 is hindered from rotating back and is maintained in one position.
As shown in
Conversely, as shown in
According to the present invention, the device for controlling the winding speed of the winding roll for the window or shade is configured to increase or decrease the winding speed of the winding roll 2 by adjusting the resilience of the torsion spring B rotated by the worm 6 and worm wheel 5 operated together. The invention prevents mechanical friction or noise when adjusting the resilience of the torsion spring B, allowing the user to adjust the winding speed of the winding roll 2 quickly and quietly and extending lifetime of the device. Also, the user can adjust the resilience of the torsion spring B more precisely and finely, thereby conveniently adjusting the speed of the winding roll 2.
While the present invention has been shown and described in connection with the preferred embodiments, it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit and scope of the invention as defined by the appended claims.
In the present invention, the resilience of a torsion spring is adjusted by a worm gear to increase or decrease a winding speed of a winding roll. Therefore, the invention allows the user to adjust the winding speed of the winding roll quickly, quietly and more conveniently while extending lifetime of the device.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2005-0038087 | May 2005 | KR | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/KR2006/001386 | 4/14/2006 | WO | 00 | 1/10/2007 |
