GB2110280A

GB2110280A - Roller blind mechanism

Info

Publication number: GB2110280A
Application number: GB08135638A
Authority: GB
Inventors: Won Jongsik
Original assignee: Individual
Current assignee: Individual
Priority date: 1981-11-26
Filing date: 1981-11-26
Publication date: 1983-06-15

Abstract

The blind carrying background for use in a photographic studio is mounted on a winding bar 10 rotatable by an endless chain 12. Chain wheel 2 has a threaded boss 3 projecting through an aperture in a support plate 1 and held by a holding ring 4 which controls the pressure of spring-biassed detents 8 against a ring of locating holes in the plate 1. Screw 11 secures the wheel 2 to the bar 10. <IMAGE>

Description

SPECIFICATION Roller blind mechanism The present invention relates to a roller blind mechanism to provide a background for studio photography.

In accordance with the invention the roller blind mechanism comprises a rotatable winding bar fixed to a wheel for winding the blind up and down, supports for the ends of the winding bar including a support plate adjacent the wheel and having a ring of recesses centred on the axis of the wheel, and a spring-loaded detent carried by said wheel and engageable with the recesses in the support plate to prevent unwanted rotation of the winding bar.

The invention will be described in more detail with the aid of an example illustrated in the accompanying drawings, in which:~ Fig. 1 is an exploded perspective view showing one end of the winding bar and its mounting and driving devices in a roller blind mechanism in accordance with the invention.

Fig. 2 is a vertical section of the roller blind mechanism of Fig. 1, and Fig. 3 is a perspective view of the roller blind mechanism in use.

The present invention relates to a winder of photo background for the photo studio, more particularly, to a winder of photo background which a rotator has a threaded projection formed at one side. A controller or holding ring is fixed to the said projection, which extends through a supporting plate. A chain path is formed along the centre part of the circumference of said rotator with pins set thereon in order not to permit the chain to slide down for the purpose of having the photo background hung down as desired.

Photographic studios have used background which is invariable and inconvenient to remove when it is not necessary, and the conventional winder has a defect as the photo background can not be hung down as required because of disordered function and as the users have to wind up the once hung down photo background as undesired.

In the present invention, if the user pulls down the chain, the rotator and the winding bar on which the photo background is wound are rotated simultaneously to permit the photo background to be hung down.

In such occasion above, a ball bearing pressed by a spring is instantly located in its seat formed in the supporting plate in order not to permit the photo background to slide down by the rotation of winding bar.

The present invention will be explained with reference to the accompanying drawing as follows: A wheel 2 is mounted on a supporting plate 1 so that a threaded projection or boss 3 extends through an aperture in the plate 1 and is fitted with a holding ring 4 which allows the wheel to be rotated. Springs 7 are set into cavities 6 in the wheel 2 in order to press the bearing balls 8 into engagement with recesses 9 formed in said supporting plate 1 as shown in Fig. 1. The winding bar 10 is fitted into the wheel 2 and then secured with a bolt 11, which passes through the holding ring 4 and the boss 3. A chain path 13 is formed along the centre part of the circumference of the wheel 2 and the endless chain 12 is set thereon with the radial pins 14 extending through the links of the chain 12.

The winding bar 10 carries the blind 15 which provides background scenery. The support 1 includes a guide hole 16 for the chain 12.

After untying the photo background being wound on the winding bar 10, if the user pulls down the chain 12, said chain does not slide down by inertia since the chain 12 is stopped by the pins 14 projecting on the chain path 13 in order to permit said photo background to be hung down as desired.

And, in the process of rotation of the wheel 2 the wheel 2 is not rotated continuously by the acceleration of the rotation of the wheel since the springs 7 press the balls 8 and the balls 8 are rotated aiso when the wheel 2 is rotated and then each ball 8 is stopped in a recess 9 formed in the supporting plate 1 so as to prevent the acceleration of the wheel 2 and not to permit said photo background to be slided down over desire.

When the user desires to enhance the pressure on the balls 8, it is achieved by tightening the holding ring 4 onto the threaded boss 3 of the wheel 2 and making the spring 7 press the bearing balls 8 into said recess 6 strongly which tends to slow the rotating speed of the wheel 2.

According to the present invention, the user can hang down the photo background as much as he desires without having the inconveniences of conventional photo background for photo studio.

Claims

1. A roller blind mechanism to provide a background for studio photography comprising a rotatable winding bar fixed to a wheel for winding the blind up and down, supports for the ends of the winding bar including a support plate adjacent the wheel and having a ring of recesses centred on the axis of the wheel, and a spring-loaded detent carried by said wheel and engageable with the recesses in the support plate to prevent unwanted rotation of the winding bar.

2. A roller blind mechanism as claimed in claim 1 in which the wheel has a number of radial pegs engaging the links of an endless chain.

3. A roller blind mechanism as claimed in claim 1 or 2, in which the wheel has a threaded boss which projects through an aperture in the support plate and receives a threaded holding ring.

4. A roller blind mechanism as claimed in claim 3, including a securing screw which passes through the holding ring and the boss and

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Roller blind mechanism The present invention relates to a roller blind mechanism to provide a background for studio photography. In accordance with the invention the roller blind mechanism comprises a rotatable winding bar fixed to a wheel for winding the blind up and down, supports for the ends of the winding bar including a support plate adjacent the wheel and having a ring of recesses centred on the axis of the wheel, and a spring-loaded detent carried by said wheel and engageable with the recesses in the support plate to prevent unwanted rotation of the winding bar. The invention will be described in more detail with the aid of an example illustrated in the accompanying drawings, in which:~ Fig. 1 is an exploded perspective view showing one end of the winding bar and its mounting and driving devices in a roller blind mechanism in accordance with the invention. Fig. 2 is a vertical section of the roller blind mechanism of Fig. 1, and Fig. 3 is a perspective view of the roller blind mechanism in use. The present invention relates to a winder of photo background for the photo studio, more particularly, to a winder of photo background which a rotator has a threaded projection formed at one side. A controller or holding ring is fixed to the said projection, which extends through a supporting plate. A chain path is formed along the centre part of the circumference of said rotator with pins set thereon in order not to permit the chain to slide down for the purpose of having the photo background hung down as desired. Photographic studios have used background which is invariable and inconvenient to remove when it is not necessary, and the conventional winder has a defect as the photo background can not be hung down as required because of disordered function and as the users have to wind up the once hung down photo background as undesired. In the present invention, if the user pulls down the chain, the rotator and the winding bar on which the photo background is wound are rotated simultaneously to permit the photo background to be hung down. In such occasion above, a ball bearing pressed by a spring is instantly located in its seat formed in the supporting plate in order not to permit the photo background to slide down by the rotation of winding bar. The present invention will be explained with reference to the accompanying drawing as follows: A wheel 2 is mounted on a supporting plate 1 so that a threaded projection or boss 3 extends through an aperture in the plate 1 and is fitted with a holding ring 4 which allows the wheel to be rotated. Springs 7 are set into cavities 6 in the wheel 2 in order to press the bearing balls 8 into engagement with recesses 9 formed in said supporting plate 1 as shown in Fig. 1. The winding bar 10 is fitted into the wheel 2 and then secured with a bolt 11, which passes through the holding ring 4 and the boss 3. A chain path 13 is formed along the centre part of the circumference of the wheel 2 and the endless chain 12 is set thereon with the radial pins 14 extending through the links of the chain 12. The winding bar 10 carries the blind 15 which provides background scenery. The support 1 includes a guide hole 16 for the chain 12. After untying the photo background being wound on the winding bar 10, if the user pulls down the chain 12, said chain does not slide down by inertia since the chain 12 is stopped by the pins 14 projecting on the chain path 13 in order to permit said photo background to be hung down as desired. And, in the process of rotation of the wheel 2 the wheel 2 is not rotated continuously by the acceleration of the rotation of the wheel since the springs 7 press the balls 8 and the balls 8 are rotated aiso when the wheel 2 is rotated and then each ball 8 is stopped in a recess 9 formed in the supporting plate 1 so as to prevent the acceleration of the wheel 2 and not to permit said photo background to be slided down over desire. When the user desires to enhance the pressure on the balls 8, it is achieved by tightening the holding ring 4 onto the threaded boss 3 of the wheel 2 and making the spring 7 press the bearing balls 8 into said recess 6 strongly which tends to slow the rotating speed of the wheel 2. According to the present invention, the user can hang down the photo background as much as he desires without having the inconveniences of conventional photo background for photo studio. Claims

4. A roller blind mechanism as claimed in claim 3, including a securing screw which passes through the holding ring and the boss and engages the winding bar to secure the wheel to the bar.

5. A roller blind mechanism substantially as described with reference to the accompanying drawings.