Restraint device for band folding pole type foldable light shield

Abstract

The application provides a restraint device for a strip folding rod type foldable light shield, which comprises a light shield body structure and a restraint structure. The light shield body structure comprises an upper end frame, a lower end frame, a flexible light shield cloth and a strip folding rod. The flexible light shield cloth is connected to the upper end frame and the lower end frame. The strip folding rod is connected to the upper end frame and the lower end frame. The strip folding rod automatically rebounds to drive the flexible light shield cloth to realize unfolding of the light shield. The restraint structure comprises an upper pressing frame, a lower pressing frame, a string, a cutting device and a control device. When the light shield body structure is in a folded state, the upper pressing frame and the lower pressing frame cooperatively form a space for accommodating the strip folding rod. The string is wound around the light shield body structure once to restrain the rebound of the strip folding rod. The control device controls the cutting device to cut the string, the strip folding rod automatically rebounds, and the light shield body structure is unfolded. The lateral sliding of the strip folding rod is restrained by the upper pressing frame and the lower pressing frame, and the rebound of the strip folding rod is restrained by the string. The device occupies a small space and has high reliability.

Description

Technical Field

[0001] This invention relates to the field of space camera auxiliary devices, and more specifically, to a restraint device for a strip-shaped foldable light shield. Background Technology

[0002] As the length of lens hoods for space optical cameras continues to increase, foldable lens hoods are becoming increasingly popular to save space and reduce weight. The most typical example is the strip-shaped folding rod type foldable lens hood. This type uses the automatic rebound function of an arc-shaped strip-shaped folding rod to unfold the flexible light-blocking fabric. To enable the lens hood to unfold automatically under remote control, a restraint device is needed to prevent the strip-shaped folding rod from rebounding before unfolding, and to quickly release the restraint via remote control when ready to unfold.

[0003] Chinese patent application CN105352720B discloses a variable-angle curved plate straight-edge constraint device, which is installed between the curved plate test piece and the column to constrain the straight-edge normal direction of the curved plate test piece. The device includes: a top wheel with a roller at one end, which contacts the curved plate test piece and can roll along the axial direction of the curved plate test piece; a triangular adjustable mechanism, the first vertex of which is connected to the other end of the top wheel, the second vertex of which is connected to the column, and the third vertex of which is a hinge point. A hypotenuse connecting rod is hinged between the first vertex and the second vertex, and the length of the hypotenuse connecting rod is adjustable. A straight-edge connecting rod with an adjustable length is provided between the first vertex and the third vertex.

[0004] The problem with this variable angle curved plate straight edge constraint device is that the adjustment mechanism occupies a large space, thus losing the advantage of the foldable sunshade occupying little space.

[0005] A Chinese patent application with publication number CN201891943U discloses a portable flexible tube restraint device, which consists of a restraint tube and a base. The restraint tube is a curved tube, which is composed of two identical half tubes. The two half tubes are fixedly connected to a fixing device along the arc edges with large and small radii of curvature. The inner diameter of the curved tube formed by the two half tubes fixed along the arc edges is larger than the outer diameter of the restrained flexible tube. The large radius of curvature part of the curved tube is located in the groove formed by the opposite side walls of the base and is connected to the opposite side walls of the base and the bottom plate. One end of the groove formed by the side walls is open to place the flat part of the curved tube, and the other end has a side plate. The vertical part of the side plate is fixedly connected to a horizontal plate, and the horizontal plate has an arc edge that matches the vertical part of the curved tube.

[0006] The problem with this portable flexible tube restraint device is that the tubular structure takes up a lot of space, making the folding rod difficult to bend.

[0007] A Chinese patent application with publication number CN208171747U discloses a restraint device, comprising: a first locking block, a second locking block, and a power supply unit; the first locking block and the second locking block are arranged opposite to each other; a first electromagnetic locking block is disposed inside the first locking block, and a second electromagnetic locking block is disposed inside the second locking block; the power supply unit is used to supply power to the first electromagnetic locking block and the second electromagnetic locking block to change the magnetic field direction and magnetic field strength of the first electromagnetic locking block and the second electromagnetic locking block.

[0008] The constraint device uses electromagnetic equipment for fixation, which may interfere with the space optical camera and makes it difficult to constrain the sides of the strip-shaped folded rod.

[0009] Currently, there is an urgent need for a constraint device that can constrain the lateral sliding and rebound of a strip-shaped folding rod, can be remotely controlled to quickly release the constraint, and occupies little space. Summary of the Invention

[0010] In view of the deficiencies in the prior art, the purpose of this invention is to provide a restraint device for a strip-shaped foldable light shield.

[0011] According to the present invention, a constraint device for a foldable sunshade with a strip-shaped folding rod is provided, comprising a sunshade body structure including an upper frame, a lower frame, a flexible light-blocking cloth, and a strip-shaped folding rod. The flexible light-blocking cloth connects the upper frame and the lower frame, and the strip-shaped folding rod connects the upper frame and the lower frame. The strip-shaped folding rod automatically rebounds, causing the flexible light-blocking cloth to unfold the sunshade. The constraint structure includes an upper pressure frame connected to the upper frame, a lower pressure frame connected to the lower frame, a thin rope, a cutting device, and a control device. When the sunshade body structure is in a folded state, the upper pressure frame and the lower pressure frame cooperate to form a space to accommodate the strip-shaped folding rod. The thin rope wraps around the sunshade body structure to constrain the rebound of the strip-shaped folding rod. The control device controls the cutting device to cut the thin rope, causing the strip-shaped folding rod to automatically rebound and the sunshade body structure to unfold.

[0012] Preferably, both the upper and lower pressure frames include a connecting portion and a triangular groove. The connecting portion of the upper pressure frame is connected to the upper end frame, and the connecting portion of the lower pressure frame is connected to the lower end frame. When the light shield body structure is in a folded state, the triangular grooves of the upper and lower pressure frames overlap, and the thin rope passes through the overlapping triangular grooves.

[0013] Preferably, the cross-sectional shape of the connecting part is L-shaped, and the shape of the outer contour of the connecting part includes an arc shape.

[0014] Preferably, temporary constraint holes are provided on the upper and lower sides of the triangular groove of the upper pressure frame, and temporary constraint holes are provided on the upper and lower sides of the triangular groove of the lower pressure frame; when the light shield body structure is folded, the temporary constraint holes on the upper pressure frame and the temporary constraint holes on the lower pressure frame coincide, and the strip-shaped folding rod is bent to a specified shape and inserted into the coincident temporary constraint holes.

[0015] Preferably, the cutting device includes a hot blade and a hot blade base, the hot blade base is connected to the lower frame, the hot blade is disposed on the hot blade base, and the control device controls the hot blade to heat up and melt the thin rope.

[0016] Preferably, the rope comprises a steel wire rope segment and a Kevlar fiber rope segment, and the hot knife acts on the Kevlar fiber rope segment.

[0017] Preferably, the hot knife base is provided with a rope take-up device, and the rope take-up device contains a coil spring. After the hot knife cuts the thin rope, the coil spring drives the thin rope to be taken into the rope take-up device.

[0018] Preferably, two vertical plates are provided above the hot knife base, and the blade of the hot knife is located between the two vertical plates; the two vertical plates are provided with round holes, and the thin rope passes through the round holes on the two vertical plates in sequence, and the center of the round holes on the two vertical plates is in the same horizontal plane as the top of the blade of the hot knife.

[0019] Preferably, the upper pressure frame and the lower pressure frame are arranged in pairs, and the number of the upper pressure frame and the lower pressure frame is the same as the number of the strip-shaped folding rod.

[0020] Preferably, the cutting device is disposed between any two adjacent strip-shaped folding rods.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This invention constrains the lateral sliding of the strip-shaped folding rod by using an upper and lower pressure frame, and constrains the rebound of the strip-shaped folding rod by using a thin rope. This effectively constrains the folded sunshade, and the constraint can be quickly released remotely by sending a signal through a control device. It also occupies little space and helps to improve the reliability of the constraint device.

[0023] 2. This invention uses a rope retractor to collect all the thin ropes cut by the hot knife inside the box. This avoids the thin ropes interfering with the unfolding of the light shield and also prevents the thin ropes floating outside from becoming an uncontrollable factor.

[0024] 3. The present invention provides temporary constraint holes on the upper and lower sides of the triangular groove of the upper pressure frame and on the upper and lower sides of the triangular groove of the lower pressure frame, allowing temporary constraint rods to be inserted to assist in the folding of the sunshade, making the operation more convenient. Attached Figure Description

[0025] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram illustrating the overall structure of the restraint device in this invention;

[0027] Figure 2 This is a schematic diagram illustrating the overall structure of the upper pressure frame, which is the main feature of this invention.

[0028] Figure 3 This is a schematic diagram illustrating the overall mechanism of the pressure frame, which is the main feature of this invention.

[0029] Figure 4 This is a schematic diagram illustrating the overall structure of the hot knife base, which is the main feature of this invention.

[0030] Figure 5 This is a schematic diagram illustrating the internal structure of the rope retractor, which is the main feature of this invention.

[0031] The figure shows: 1. Sunshade body structure; 2. Upper pressure frame; 3. Thin rope; 4. Lower pressure frame; 5. Hot knife; 6. Hot knife base; 7. Rope retractor; 71. Coil spring. Detailed Implementation

[0032] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0033] Example 1

[0034] like Figure 1 As shown, a constraint device for a foldable sunshade with a strip-shaped folding rod, according to the present invention, includes a sunshade body structure 1 and a constraint structure. The sunshade body structure 1 includes an upper frame, a lower frame, a flexible light-blocking cloth, and a strip-shaped folding rod. The flexible light-blocking cloth connects the upper frame and the lower frame, and the strip-shaped folding rod connects the upper frame and the lower frame. The strip-shaped folding rod automatically springs back, causing the flexible light-blocking cloth to unfold the sunshade. In order to enable the sunshade body structure 1 to unfold automatically under remote control, a constraint device is needed to prevent the strip-shaped folding rod from springing back before unfolding, and to quickly release the constraint through remote control when ready to unfold.

[0035] like Figure 1 , Figure 2 as well as Figure 3As shown, the constraint structure includes an upper pressure frame 2 connected to the upper frame, a lower pressure frame 4 connected to the lower frame, a thin rope 3, a cutting device, and a control device. When the sunshade body structure 1 is in the folded state, the upper pressure frame 2 and the lower pressure frame 4 cooperate to form a space to accommodate the strip-shaped folding rod. The thin rope 3 wraps around the sunshade body structure 1 to constrain the rebound of the strip-shaped folding rod. The control device controls the cutting device to cut the thin rope 3, the strip-shaped folding rod automatically rebounds, and the sunshade body structure 1 unfolds.

[0036] The upper pressure frame 2 and the lower pressure frame 4 constrain the lateral sliding of the strip-shaped folding rod. The thin rope 3 constrains the rebound of the strip-shaped folding rod. By constraining the lateral sliding of the strip-shaped folding rod with the upper pressure frame 2 and the lower pressure frame 4, and by constraining the rebound of the strip-shaped folding rod with the thin rope 3, the folded sunshade body structure 1 is effectively constrained.

[0037] Specifically, both the upper pressure frame 2 and the lower pressure frame 4 include a connecting part and a triangular groove. The connecting part of the upper pressure frame 2 is connected to the upper frame, and the connection method can be adhesive bonding. The connecting part of the lower pressure frame 4 is connected to the lower frame, and the connection method can also be adhesive bonding. When the light shield body structure 1 is in the folded state, the triangular grooves of the upper pressure frame 2 and the lower pressure frame 4 overlap, and the thin rope 3 passes through the overlapping triangular grooves. This not only restricts the springback of the strip-shaped folding rod, but also restricts the up-and-down movement of the upper pressure frame 2 and the lower pressure frame 4.

[0038] The cross-sectional shape of the connecting part is L-shaped, and the shape of the outer contour of the connecting part includes an arc shape. This is used to increase the bonding area between the upper pressure frame 2 and the upper end frame, and the bonding area between the lower pressure frame 4 and the lower end frame, thereby helping to improve the stability of the upper pressure frame 2 and the lower pressure frame 4 on the light shield body structure 1.

[0039] Furthermore, temporary constraint holes are provided on the upper and lower sides of the triangular groove of the upper pressure frame 2, and temporary constraint holes are provided on the upper and lower sides of the triangular groove of the lower pressure frame 4. When the light shield body structure 1 is folded, the temporary constraint holes on the upper pressure frame 2 and the temporary constraint holes on the lower pressure frame 4 coincide. The strip-shaped folding rods are bent to the specified shape and inserted into the coincident temporary constraint holes. This serves as a temporary constraint. After all the strip-shaped folding rods have been bent and tied with thin ropes 3, all the round rods can be removed.

[0040] like Figure 1 and Figure 4As shown, the cutting device includes a hot blade 5 and a hot blade base 6. The hot blade base 6 is connected to the lower frame, and the hot blade 5 is mounted on the hot blade base 6. The control device controls the hot blade 5 to heat up and melt the thin rope 3. The control device controls the power supply to be turned on via a signal. The hot blade 5 heating up and melting the thin rope 3 can achieve remote control for rapid release of constraint. The thin rope 3 includes a steel wire rope segment and a Kevlar fiber rope segment. The hot blade 5 acts on the Kevlar fiber rope segment. More specifically, the main body of the thin rope 3 is a 1mm diameter steel wire rope, which meets the rigidity requirements and has a diameter suitable for storage and winding in the rope take-up device 7. In the cutting part of the hot blade 5, a 2mm diameter Kevlar fiber rope is connected in series to ensure that it can be melted.

[0041] Two vertical plates are positioned above the hot knife base 6, with the blade head of the hot knife 5 located between them. Circular holes are provided on the two vertical plates, through which the thin rope 3 passes sequentially. The centers of the circular holes on the two vertical plates, the center of the triangular groove in the upper pressure frame 2, the center of the triangular groove in the lower pressure frame 4, and the tip of the hot knife 5 are all on the same horizontal plane. This design facilitates cutting with the hot knife 5 and prevents the thin rope 3 from being subjected to forces other than those in the horizontal direction.

[0042] like Figure 1 and Figure 5 As shown, a rope retractor 7 is provided on the hot knife base 6. The rope retractor 7 contains a coil spring 71. After the hot knife 5 cuts the thin rope 3, the coil spring 71 drives the thin rope 3 to be retracted into the rope retractor 7. This not only avoids interference when the light shield body structure 1 is unfolded, but also prevents the thin rope 3 floating outside from becoming an uncontrollable factor.

[0043] It should be further noted that the upper pressure frame 2 and the lower pressure frame 4 of the present invention are arranged in pairs, and the number of the upper pressure frame 2 and the lower pressure frame 4 is the same as the number of strip-shaped folding rods. The cutting device is arranged between any two adjacent strip-shaped folding rods.

[0044] Preferred Example 1

[0045] Based on Example 1, such as Figure 1 As shown, a constraint device for a strip-shaped folding rod type sunshade body structure provided by the present invention includes an upper pressure frame 2, a thin rope 3, a lower pressure frame 4, a hot knife 5, a hot knife base 6, and a rope retractor 7. The upper pressure frame 2 and the lower pressure frame 4 are respectively glued to the upper end frame and the lower end frame of the sunshade body structure 1. The hot knife 5 and the hot knife base 6 are located between two of the strip-shaped folding rods and glued to the lower end frame of the sunshade body structure 1. The thin rope 3 is connected to the rope retractor 7 after wrapping around the sunshade body structure 1 once. The rope retractor 7 is glued to the outside of the hot knife base 6.

[0046] In this preferred embodiment, the outer diameter of the light shield body structure 1 adapted to the restraint device is 300mm, the height after folding is 100mm, and the width of the strip-shaped folding rod is 20mm.

[0047] like Figure 2 and Figure 3 As shown, the distance between the two side plates of the upper pressure frame 2 is 24mm, and the distance between the two side plates of the lower pressure frame 4 is 22mm. The thickness of the side plates is 1mm. Both the upper pressure frame 2 and the lower pressure frame 4 have L-shaped arc-shaped flanges at their bonding points with the main body structure 1 of the sunshade, used to increase the bonding area. The flange span is 50mm. The overlapping part of the upper pressure frame 2 and the lower pressure frame 4 has a triangular groove. After the sunshade is folded, the grooves align, and a thin rope 3 with a diameter of approximately 1mm passes through the groove, which both restricts the springback of the strip-shaped folding rod and restricts the vertical movement of the upper pressure frame 2 and the lower pressure frame 4. Both the upper and lower sides of the groove of the upper pressure frame 2 and the lower pressure frame 4 have circular holes with a diameter of 2.2mm, into which a circular rod with a diameter of 2mm can be inserted to assist in the folding of the sunshade.

[0048] like Figure 4 As shown, the hot knife base 6 has a circular opening with a diameter of 19mm and two M3 threaded holes in the vertical direction for mounting the hot knife 5. The two protruding vertical plates above have circular holes with a diameter of 3mm for the thin rope 3 to pass through. The blade of the hot knife 5 is located in the center of the two vertical plates. The center of the circular hole on the vertical plate, the middle of the groove of the upper pressure frame 2 and the lower pressure frame 4, and the top of the blade of the hot knife 5 are on the same horizontal plane. This facilitates the cutting of the hot knife 5 and prevents the thin rope 3 from being subjected to forces other than those in the horizontal direction.

[0049] like Figure 5 As shown, the rope retractor 7 contains a coil spring 71. When the rope 3 is cut, the coil spring 71 will drive the rope 3 to be completely retracted into the box of the rope retractor 7.

[0050] When folding the sunshade, bend a strip-shaped folding rod to the specified shape. Then, insert a round rod into the round hole on this side to temporarily constrain the upper pressure frame 2 and the lower pressure frame 4. This also prevents the strip-shaped folding rod from springing back. After all the strip-shaped folding rods are bent and tied with thin rope 3, all the round rods can be removed.

[0051] When the sunshade needs to be unfolded, the power of the hot knife 5 is turned on by signal control. The hot knife 5 heats and cuts the thin rope 3 within 20 seconds, realizing remote control to quickly release the constraint. The sunshade is unfolded under the rebound action of the strip-shaped folding rod. At this time, the lower pressure frame 4 is fixed and the upper pressure frame 2 moves linearly along the unfolding direction with the top of the sunshade.

[0052] Those skilled in the art will understand that, besides implementing the system and its various devices, modules, and units provided by this invention in the form of purely computer-readable program code, the same functions can be achieved entirely through logical programming of the method steps, making the system and its various devices, modules, and units of this invention function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, the system and its various devices, modules, and units provided by this invention can be considered as a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered as structures within the hardware component; alternatively, the devices, modules, and units for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0053] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0054] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A restraint device for a strip-shaped foldable light shield, characterized in that, include: The main structure of the light shield (1) includes an upper frame, a lower frame, a flexible light shielding cloth and a strip-shaped folding rod. The flexible light shielding cloth connects the upper frame and the lower frame, and the strip-shaped folding rod connects the upper frame and the lower frame. The strip-shaped folding rod automatically rebounds to drive the flexible light shielding cloth to unfold the light shield. The constraint structure includes an upper pressure frame (2) connected to the upper frame, a lower pressure frame (4) connected to the lower frame, a thin rope (3), a cutting device, and a control device. When the light shield body structure (1) is in a folded state, the upper pressure frame (2) and the lower pressure frame (4) cooperate to form a space to accommodate the strip-shaped folded rod. The thin rope (3) wraps around the light shield body structure (1) to constrain the rebound of the strip-shaped folded rod. The control device controls the cutting device to cut the thin rope (3), the strip-shaped folding rod automatically springs back, and the main structure (1) of the light shield unfolds; Both the upper pressure frame (2) and the lower pressure frame (4) include a connecting part and a triangular groove. The connecting part of the upper pressure frame (2) is connected to the upper end frame, and the connecting part of the lower pressure frame (4) is connected to the lower end frame. When the light shield body structure (1) is in a folded state, the triangular groove of the upper pressure frame (2) and the triangular groove of the lower pressure frame (4) overlap, and the thin rope (3) passes through the overlapping triangular groove.

2. The constraint device for a strip-shaped foldable light shield as described in claim 1, characterized in that, The cross-sectional shape of the connecting part is L-shaped, and the shape of the outer contour of the connecting part includes an arc shape.

3. The constraint device for a strip-shaped foldable light shield as described in claim 2, characterized in that, Temporary constraint holes are provided on the upper and lower sides of the triangular groove of the upper pressure frame (2), and temporary constraint holes are provided on the upper and lower sides of the triangular groove of the lower pressure frame (4). When the light shield body structure (1) is folded, the temporary constraint holes on the upper pressure frame (2) and the temporary constraint holes on the lower pressure frame (4) coincide. The strip-shaped folding rod is bent to a specified shape and a temporary constraint rod is inserted into the coincident temporary constraint hole.

4. The constraint device for a strip-shaped foldable light shield as described in claim 1, characterized in that, The cutting device includes a hot knife (5) and a hot knife base (6). The hot knife base (6) is connected to the lower frame. The hot knife (5) is set on the hot knife base (6). The control device controls the hot knife (5) to heat up and melt the thin rope (3).

5. The constraint device for a strip-shaped foldable light shield as described in claim 4, characterized in that, The thin rope (3) includes a steel wire rope segment and a Kevlar fiber rope segment, and the hot knife (5) acts on the Kevlar fiber rope segment.

6. The constraint device for a strip-shaped foldable light shield as described in claim 4, characterized in that, A rope take-up device (7) is provided on the hot knife base (6). A coil spring (71) is inside the rope take-up device (7). After the hot knife (5) cuts the thin rope (3), the coil spring (71) drives the thin rope (3) to be taken into the rope take-up device (7).

7. The constraint device for a strip-shaped foldable light shield as described in claim 4, characterized in that, Two vertical plates are provided above the hot knife base (6), and the blade of the hot knife (5) is located between the two vertical plates; The two vertical plates are provided with round holes. The thin rope (3) passes through the round holes on the two vertical plates in sequence, and the center of the round holes on the two vertical plates is in the same horizontal plane as the top of the blade of the hot knife (5).

8. The constraint device for a strip-shaped foldable light shield as described in claim 1, characterized in that, The upper pressure frame (2) and the lower pressure frame (4) are arranged in pairs, and the number of the upper pressure frame (2) and the lower pressure frame (4) is the same as the number of the strip-shaped folding rods.

9. The constraint device for a strip-shaped foldable light shield as described in claim 1, characterized in that, The cutting device is positioned between any two adjacent strip-shaped folding rods.

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