WO2006109103A1 - Tiltable parasol support - Google Patents
Tiltable parasol support Download PDFInfo
- Publication number
- WO2006109103A1 WO2006109103A1 PCT/HU2005/000037 HU2005000037W WO2006109103A1 WO 2006109103 A1 WO2006109103 A1 WO 2006109103A1 HU 2005000037 W HU2005000037 W HU 2005000037W WO 2006109103 A1 WO2006109103 A1 WO 2006109103A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hinge
- head portion
- support shaft
- axis
- parasol
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45B—WALKING STICKS; UMBRELLAS; LADIES' OR LIKE FANS
- A45B17/00—Tiltable umbrellas
Definitions
- the object of the invention is a tiltable parasol support, and more particularly a tiltable parasol support of which the umbrella portion comprising the shade cover can be tilted, by virtue of a hinge disposed between the ribs and stretchers, in such a way that the support shaft meanwhile remains in a fully upright position.
- solutions relating to tiltable parasol supports can be found in patent literature. These solutions can be divided into two main groups.
- the major characteristics of solutions belonging to the first group is that the support device has two portions, the lower portion always remaining in vertical position while the upper portion is being tilted to the desired extent, orienting the umbrella conforming to the direction of the Sun.
- Parasol supports belonging to the second group comprise a support shaft that remains in vertical position in its entirety, and only the umbrella portion comprising the shade cover can be tilted to the desired extent.
- support devices of the second group comprising a vertical support shaft and a tiltable umbrella portion, are more advantageous but they require more complex mechanisms for the convenient adjustment of the tilt angle and for maintaining that the umbrella keeps the adjusted tilt angle.
- WO 03/073884 Al discloses a tiltable parasol support comprising a hinge disposed between the umbrella ribs and the stretchers. This solution is characterised by that the umbrella frame can be tilted to the desired extent through an arched gear element, by rotating a runner that is freely rotatable with respect to the stretchers.
- the aim of our invention has been to provide a tiltable parasol support which can be easily operated, is reliable, looks good, and has low manufacturing costs.
- Our invention is therefore a tiltable parasol support comprising a support shaft, a head portion, . ribs connected to the head portion, a shade cover connected to the ribs, stretchers connected to a runner that is slidably and rotatably mounted on the support shaft, and a hinge disposed between the ribs and the stretchers and connecting the support shaft and the head portion.
- the angles between the axis of rotation of the hinge and the longitudinal axis of the support shaft and of the head portion are less than 45°, the hinge tilts the head portion by rotating the head portion relative to the support shaft, the hinge is self-locking with respect to the tilting torque arising between the head portion and the support shaft, and there is such torque-transfer connection between the head portion and the ribs or between the head portion and the cover attached to the ribs which makes it possible to adjust the tilt angle of the parasol by rotating the head portion with respect to the support shaft.
- the hinge By the self-locking characteristics of the hinge it is meant that the head portion and the shade cover attached to it are not rotated (and therefore are not tilted) with respect to the support shaft due to tilting torques caused by wind load or by the mass of the tilted parasol, but in case the shade cover (and the head portion attached thereto) is rotated relative to the support shaft by the user, the hinge brings about the tilting of the head portion.
- the tilt angle can be easily and efficiently adjusted, with the parasol retaining its position after such adjustment has been finished.
- the inventive solution has different physical principle of operation from solutions applying parts locking by means of clamping force or using interlocking parts.
- Fig. 1 shows the parasol in tilted position
- Fig. 2 shows the cross-sectional view of the hinge of the parasol in upright position
- Fig. 3 shows the cross-sectional view of the hinge in tilted position.
- a head portion 2 is connected to the support shaft 1 through a hinge 7.
- Ribs 3 and a shade cover 4 are connected to the head portion 2 in such a way that, in case either the cover 4 or the ribs 3 are rotated, the torque is transferred to the head portion 2.
- Stretchers 6 are connected to the ribs 6. By rotating the shade cover 4 or the ribs 3 the stretchers 6 are also rotated, with the runner 5 that is slidably and rotatably mounted on the support shaft 1 being rotated in turn by the stretchers 6.
- the head portion 2 Because the head portion 2 is connected to the upper portion of the hinge 7, rotating the head portion 2 causes the rotation of the upper and lower portions of the hinge 7 with respect to each other about the axis of rotation 8 of the hinge 7, and the head portion 2 gets tilted with respect to the support shaft 1.
- the reaction torque arising at the support shaft 1 connected to the lower portion of the hinge 7 must of course be eliminated either by the connection between the support shaft 1 and the hinge 7 or by the user.
- the user grabs the support shaft 1, preferably with one hand, and rotates the cover 4, ribs 3 or the stretchers 6 with the other, first the degree of tilt of the cover can be set, while as a second step the orientation of the cover 4 relative to the direction of the Sun can be adjusted.
- the extent of tilt can be adjusted very conveniently because the diameter of the shade cover 4 is sufficiently large to make it possible that the torque produced as a product of the force exerted on the edge of cover 4 and the radius of the cover 4 can compensate for the internal losses arising in the hinge 7 and can provide the force needed to lift the combined centre of gravity of the tilted components.
- Parameters of the parasol support namely, angles alfa and beta, measured between the axis of rotation 8 of the hinge 7 and the longitudinal axis of the support shaft 1 and between the axis of rotation 8 of the hinge and the longitudinal axis of the head portion 2 respectively, and the diameter and shape, most importantly, the conicity, of friction surfaces of the hinge 7 are chosen, taking into account the friction coefficient determined by the materials applied in the hinge and the required lubrication conditions thereof, in such a way that the head portion 2 can be tilted with respect to the support shaft 1 by easily rotating the head portion 2 relative to the support shaft 1, but the tilting torque arising between the head portion 2 and the support shaft 1 is taken up by the hinge 7 without being rotated (and therefore, without being tilted).
- the hinge is self-locking with respect to tilting torques, but the tilt of the cover ,4 can be adjusted by easily rotating the head portion 2 relative to the support shaft 1. Although light winds may slightly turn the parasol around the axis of the support shaft 1, it will always retain the adjusted tilt angle. Due to the applied hinge 7 construction, a means for limiting rotation is not necessary.
- the cover 4 can be freely turned around and so overstrains that may result from benevolent but incompetent user actions cannot do any damage to the parasol.
- Figs. 2 and 3 show, in upright and tilted position, the hinge of the embodiment of the invention that is shown in Fig. 1
- the materials applied for the hinge 7 and the required lubrication conditions of the hinge 7, are less than 45°, preferably fall into the range of 10°-40°, more preferably into the range of 25°r35°.
- the tilt angle alfa (measured between the axis of rotation 8 of the hinge 7 and the longitudinal axis of the support shaft 1) be equal to the tilt angle beta (measured between the axis of rotation 8 of the hinge 7 and the longitudinal axis of the head portion 2) because in that case the longitudinal axes of the support shaft 1 and the head portion 2 can be set collinearly.
- the inventive tiltable parasol support can be implemented in such a way that the axis of rotation 8 of the hinge 7 and the longitudinal axis of the support shaft 1 and/or the axis of rotation 8 of the hinge 7 and the longitudinal axis of the head portion 2 are in a slightly skew position relative to each other.
- Such configuration may in some cases provide for compensating the geometric deformations arising in the ribs-stretchers system of the parasol.
- the support can be configured such that the axis of rotation 8 of the hinge 7, the longitudinal axis of the support shaft 1 and the longitudinal axis of the head portion 2 intersect each other.
- a slot 13 is disposed in the shaft 9 of the hinge 7 in such a way that during the assembly of the hinge 7 the slot 13 closes up as a result of the action of the lead-in tapering portion 10 and thus the shaft 9 is passed through the opening 12 disposed on the support shaft 1. After the end of the shaft 9 has been passed through the opening 12, the "head" of the shaft 9 extends and prevents the disjoining of the two members that form the hinge 7. The shaft 9 can be easily turned round in the opening 12.
- a key 14 is disposed in the slot 13 such that the key 14 snaps in the slot 13 formed in the shaft 9 of the hinge 7.
- the hinge 7 is implemented with a double load-bearing section, which preferably ensures that the inner surface of the hinge 7 has a tapering portion 11. This means that the tilting torque arising between the two halves of the hinge 7 is taken collectively by the shaft 9 arid the ring 16 that is shown in Fig. 2.
- Friction surfaces of the hinge 7 may need lubrication.
- an insert 15 is disposed between the exterior shoulders of the hinge portions located on the support shaft 1 and on the head portion 2, with the insert 15 being configured such that, in a given region, the thickness of the insert 15 increases as the diameter thereof is decreasing.
Abstract
Tiltable parasol support comprising a support shaft, a head portion, ribs connected to the head portion, a cover connected to the ribs, stretchers connected to a runner that is slidable and rotatably mounted on the support shaft, and a hinge disposed between the ribs and the stretchers and connecting the support shaft and the head portion. The angle (alfa) between the axis of rotation (8) of the hinge (7) and the longitudinal axis of the head portion (2) and angle (beta) between the axis of rotation (8) of the hinge (7) and the longitudinal axis of support shaft (1) are less than 45°, the hinge (7) tilts the head portion (2) by rotating the head portion (2) relative to the support shaft (1), the hinge (7) is self-locking with respect to the tilting torque arising between the head portion (2) and the support shaft (1), and by that there is such torque-transfer connection between the head portion (2) and the ribs (3) or between the head portion (2) and the cover (4) attached to the ribs (3) which makes it possible to adjust the tilt angle of the parasol by rotating the head portion (2) with respect to the support shaft (1).
Description
Tiltable parasol support
The object of the invention is a tiltable parasol support, and more particularly a tiltable parasol support of which the umbrella portion comprising the shade cover can be tilted, by virtue of a hinge disposed between the ribs and stretchers, in such a way that the support shaft meanwhile remains in a fully upright position.
A large number of documents disclosing solutions relating to tiltable parasol supports can be found in patent literature. These solutions can be divided into two main groups. The major characteristics of solutions belonging to the first group is that the support device has two portions, the lower portion always remaining in vertical position while the upper portion is being tilted to the desired extent, orienting the umbrella conforming to the direction of the Sun. Parasol supports belonging to the second group comprise a support shaft that remains in vertical position in its entirety, and only the umbrella portion comprising the shade cover can be tilted to the desired extent. As a general observation it can be established that, from the aspect of space consumption, balancing and overall aesthetic impression, support devices of the second group, comprising a vertical support shaft and a tiltable umbrella portion, are more advantageous but they require more complex mechanisms for the convenient adjustment of the tilt angle and for maintaining that the umbrella keeps the adjusted tilt angle.
The document WO 03/073884 Al discloses a tiltable parasol support comprising a hinge disposed between the umbrella ribs and the stretchers. This solution is characterised by that the umbrella frame can be tilted to the desired extent through an arched gear element, by rotating a runner that is freely rotatable with respect to the stretchers.
The aim of our invention has been to provide a tiltable parasol support which can be easily operated, is reliable, looks good, and has low manufacturing costs.
Our invention is therefore a tiltable parasol support comprising a support shaft, a head portion, .ribs connected to the head portion, a shade cover connected to the ribs, stretchers connected to a runner that is slidably and rotatably mounted on the support shaft, and a hinge disposed between the ribs and the stretchers and connecting the support shaft and the head portion. The angles between the axis of rotation of the hinge and the longitudinal axis of the support shaft and of the head portion are less than 45°, the hinge tilts the head portion by rotating the head portion relative to the support shaft, the hinge is self-locking with respect to the tilting torque arising between the head portion and the support shaft, and there is such torque-transfer connection between the head portion and the ribs or between the head portion and the cover attached to the ribs which makes it possible to adjust the tilt angle of the parasol by rotating the head portion with respect to the support shaft.
By the self-locking characteristics of the hinge it is meant that the head portion and the shade cover attached to it are not rotated (and therefore are not tilted) with respect to the support shaft due to tilting torques caused by wind load or by the mass of the tilted parasol, but in case the shade cover (and the head portion attached thereto) is rotated relative to the support shaft by the user, the hinge brings about the tilting of the head portion. Thus, by rotating the parasol the tilt angle can be easily and efficiently adjusted, with the parasol retaining its position after such adjustment has been finished. The inventive solution has different physical principle of operation from solutions applying parts locking by means of clamping force or using interlocking parts.
A preferred embodiment of the invention is explained in detail with reference to the attached drawings, where
Fig. 1 shows the parasol in tilted position,
Fig. 2 shows the cross-sectional view of the hinge of the parasol in upright position, and
Fig. 3 shows the cross-sectional view of the hinge in tilted position.
In the embodiment of the invention that is shown in Fig. 1 a head portion 2 is connected to the support shaft 1 through a hinge 7. Ribs 3 and a shade cover 4 are connected to the head portion 2 in such a way that, in case either the cover 4 or the ribs 3 are rotated, the torque is
transferred to the head portion 2. Stretchers 6 are connected to the ribs 6. By rotating the shade cover 4 or the ribs 3 the stretchers 6 are also rotated, with the runner 5 that is slidably and rotatably mounted on the support shaft 1 being rotated in turn by the stretchers 6.
Because the head portion 2 is connected to the upper portion of the hinge 7, rotating the head portion 2 causes the rotation of the upper and lower portions of the hinge 7 with respect to each other about the axis of rotation 8 of the hinge 7, and the head portion 2 gets tilted with respect to the support shaft 1. The reaction torque arising at the support shaft 1 connected to the lower portion of the hinge 7 must of course be eliminated either by the connection between the support shaft 1 and the hinge 7 or by the user. In case the user grabs the support shaft 1, preferably with one hand, and rotates the cover 4, ribs 3 or the stretchers 6 with the other, first the degree of tilt of the cover can be set, while as a second step the orientation of the cover 4 relative to the direction of the Sun can be adjusted. Due to the internal force conditions of the inventive parasol support the extent of tilt can be adjusted very conveniently because the diameter of the shade cover 4 is sufficiently large to make it possible that the torque produced as a product of the force exerted on the edge of cover 4 and the radius of the cover 4 can compensate for the internal losses arising in the hinge 7 and can provide the force needed to lift the combined centre of gravity of the tilted components.
Parameters of the parasol support, namely, angles alfa and beta, measured between the axis of rotation 8 of the hinge 7 and the longitudinal axis of the support shaft 1 and between the axis of rotation 8 of the hinge and the longitudinal axis of the head portion 2 respectively, and the diameter and shape, most importantly, the conicity, of friction surfaces of the hinge 7 are chosen, taking into account the friction coefficient determined by the materials applied in the hinge and the required lubrication conditions thereof, in such a way that the head portion 2 can be tilted with respect to the support shaft 1 by easily rotating the head portion 2 relative to the support shaft 1, but the tilting torque arising between the head portion 2 and the support shaft 1 is taken up by the hinge 7 without being rotated (and therefore, without being tilted). Thus, the hinge is self-locking with respect to tilting torques, but the tilt of the cover ,4 can be adjusted by easily rotating the head portion 2 relative to the support shaft 1. Although light winds may slightly turn the parasol around the axis of the support shaft 1, it will always retain the adjusted tilt angle. Due to the applied hinge 7 construction, a means for limiting rotation is
not necessary. The cover 4 can be freely turned around and so overstrains that may result from benevolent but incompetent user actions cannot do any damage to the parasol.
Figs. 2 and 3 show, in upright and tilted position, the hinge of the embodiment of the invention that is shown in Fig. 1
Depending on the maximum desired tilt angle, the materials applied for the hinge 7 and the required lubrication conditions of the hinge 7, the shape and dimensions of the friction surfaces, tilt angles alfa, beta (measured, respectively, between the axis of rotation 8 of the hinge 7 and the longitudinal axis of the support shaft 1, and between the axis of rotation 8 of the hinge 7 and the longitudinal axis of the head portion 2) are less than 45°, preferably fall into the range of 10°-40°, more preferably into the range of 25°r35°. From the point of view of the aesthetic appearance of the parasol, primarily in its closed state but in the unfurled state as well, it is preferable that the tilt angle alfa (measured between the axis of rotation 8 of the hinge 7 and the longitudinal axis of the support shaft 1) be equal to the tilt angle beta (measured between the axis of rotation 8 of the hinge 7 and the longitudinal axis of the head portion 2) because in that case the longitudinal axes of the support shaft 1 and the head portion 2 can be set collinearly.
The inventive tiltable parasol support can be implemented in such a way that the axis of rotation 8 of the hinge 7 and the longitudinal axis of the support shaft 1 and/or the axis of rotation 8 of the hinge 7 and the longitudinal axis of the head portion 2 are in a slightly skew position relative to each other. Such configuration may in some cases provide for compensating the geometric deformations arising in the ribs-stretchers system of the parasol. Alternatively, the support can be configured such that the axis of rotation 8 of the hinge 7, the longitudinal axis of the support shaft 1 and the longitudinal axis of the head portion 2 intersect each other.
From the aspect of logistics and assembly technology, costs can be reduced if the shaft 9 of the hinge 7 is integrated with the support shaft 1 to form a one-piece member. Alternatively, the shaft 9 can be integrated with the head portion 2. Such integration only marginally raises
manufacturing costs. A slot 13 is disposed in the shaft 9 of the hinge 7 in such a way that during the assembly of the hinge 7 the slot 13 closes up as a result of the action of the lead-in tapering portion 10 and thus the shaft 9 is passed through the opening 12 disposed on the support shaft 1. After the end of the shaft 9 has been passed through the opening 12, the "head" of the shaft 9 extends and prevents the disjoining of the two members that form the hinge 7. The shaft 9 can be easily turned round in the opening 12. A key 14 is disposed in the slot 13 such that the key 14 snaps in the slot 13 formed in the shaft 9 of the hinge 7.
The hinge 7 is implemented with a double load-bearing section, which preferably ensures that the inner surface of the hinge 7 has a tapering portion 11. This means that the tilting torque arising between the two halves of the hinge 7 is taken collectively by the shaft 9 arid the ring 16 that is shown in Fig. 2.
Friction surfaces of the hinge 7 may need lubrication. In order to prevent lubricant bleeding and friction surface contamination, and also to provide that the connection has aesthetic look, an insert 15 is disposed between the exterior shoulders of the hinge portions located on the support shaft 1 and on the head portion 2, with the insert 15 being configured such that, in a given region, the thickness of the insert 15 increases as the diameter thereof is decreasing.
List of references
Alfa tilt angle
Beta tilt angle
1 support shaft
2 head portion
3 rib
4 cover
5 runner
6 stretcher
7 hinge
8 axis of rotation
9 shaft
10 tapering portion
11 tapering portion
12 opening
13 slot
14 key
15 insert
16 ring
Claims
1. Tiltable parasol support comprising a support shaft, a head portion, ribs connected to the head portion, a cover connected to the ribs, stretchers connected to a runner that is slidably and rotatably mounted on the support shaft, and a hinge disposed between the ribs and the stretchers and connecting the support shaft and the head portion, characterised by that the angle (alfa) between the axis of rotation (8) of the hinge (7) and the longitudinal axis of the head portion (2) and angle (beta) between the axis of rotation (8) of the hinge (7) and the longitudinal axis of support shaft (1) are less than 45°, the hinge (7) tilts the head portion (2) by rotating the head portion (2) relative to the support shaft (1), the hinge (7) is self-locking with respect to the tilting torque arising between the head portion (2) and the support shaft (1), and by that there is such torque-transfer connection between the head portion (2) and the ribs (3) or between the head portion (2) and the cover (4) attached to the ribs (3) which makes it possible to adjust the tilt angle of the parasol by rotating the head portion (2) with respect to the support shaft (1).
2. The tiltable parasol support according to Claim 1, characterised by that the angles (beta, alfa) between the axis of rotation (8) of the hinge (7) and the longitudinal axis of the support shaft (1) and between the axis of rotation (8) of the hinge (7) and the longitudinal axis of the head portion (2) fall into the range of 10°-40°, preferably into the range of 25°-35°.
3. The tiltable parasol support according to Claim 1, characterised by that the angle (beta) between the axis of rotation (8) of the hinge (7) and the longitudinal axis of the support shaft (1) is equal to the angle (alfa) measured between the axis of rotation (8) of the hinge (7) and the longitudinal axis of the head portion (2).
4. The tiltable parasol support according to Claim 1, characterised by that the axis of rotation (8) of the hinge (7) and the longitudinal axis of the support shaft (1) and/or the axis of rotation (8) of the hinge (7) and the longitudinal axis of the head portion (2) are skew lines.
5. The tiltable parasol support according to Claim 1, characterised by that the axis of rotation (8) of the hinge (7), the longitudinal axis of the support shaft (1), and the longitudinal axis of the head portion (2) intersect each other.
6. The tiltable parasol support according to Claim 1, characterised by that the shaft (9) of the hinge (7) is integrated with the support shaft (1) or with the head portion (2) to form a one- piece member.
7. The tiltable parasol support according to Claim 1, characterised by that a slot (13) is disposed in the shaft (9) of the hinge (7) in such a way that, during the assembly of the hinge (7) the slot (13) closes up and the shaft (9) is passed through the opening (12) disposed on the support shaft (1) or the head portion (2).
8. The tiltable parasol support according to Claim 1, characterised by that a snap-in key (14) is disposed in the slot (13) located in the shaft (9) of the hinge (7).
9. The tiltable parasol support of Claim 1, characterised by that the hinge (7) has at least two load-bearing sections, with at least one of the load-bearing sections preferably having a tapering portion (11).
10. The tiltable parasol support of Claim 1, characterised by that an insert (15) is disposed between the exterior shoulders formed on the abutting surfaces of the hinge portions located on the support shaft (1) and the head portion (2), with the insert (15) being configured such that, in a given region, the thickness of the insert (15) increases as the diameter thereof is decreasing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/HU2005/000037 WO2006109103A1 (en) | 2005-04-15 | 2005-04-15 | Tiltable parasol support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/HU2005/000037 WO2006109103A1 (en) | 2005-04-15 | 2005-04-15 | Tiltable parasol support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006109103A1 true WO2006109103A1 (en) | 2006-10-19 |
Family
ID=35355166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/HU2005/000037 WO2006109103A1 (en) | 2005-04-15 | 2005-04-15 | Tiltable parasol support |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2006109103A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9155364B2 (en) | 2013-10-24 | 2015-10-13 | Mario Jason | Sunshade positioning device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2013192A (en) * | 1932-11-23 | 1935-09-03 | Smith Thomas Sidney | Joint fitting for sun umbbella poles |
| CH303853A (en) * | 1952-07-16 | 1954-12-15 | Aellig Werner | Adjusting device for garden umbrellas. |
| US2819725A (en) * | 1956-03-19 | 1958-01-14 | Troy Sunshade Company | Umbrella |
| EP0368539A2 (en) * | 1988-11-09 | 1990-05-16 | Hoyland Fox Limited | Umbrella frame |
| EP1040771A2 (en) * | 1999-04-02 | 2000-10-04 | Tradewinds Parasol Limited | Umbrella |
-
2005
- 2005-04-15 WO PCT/HU2005/000037 patent/WO2006109103A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2013192A (en) * | 1932-11-23 | 1935-09-03 | Smith Thomas Sidney | Joint fitting for sun umbbella poles |
| CH303853A (en) * | 1952-07-16 | 1954-12-15 | Aellig Werner | Adjusting device for garden umbrellas. |
| US2819725A (en) * | 1956-03-19 | 1958-01-14 | Troy Sunshade Company | Umbrella |
| EP0368539A2 (en) * | 1988-11-09 | 1990-05-16 | Hoyland Fox Limited | Umbrella frame |
| EP1040771A2 (en) * | 1999-04-02 | 2000-10-04 | Tradewinds Parasol Limited | Umbrella |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9155364B2 (en) | 2013-10-24 | 2015-10-13 | Mario Jason | Sunshade positioning device |
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