Adjustable climbing frame for landscaping construction and adjusting method

Abstract

The invention discloses an adjustable climbing frame for landscaping construction and an adjusting method.The adjustable climbing frame comprises bottom plates located on the two sides, a plurality of nailing holes are formed in the bottom plates in a penetrating mode, a supporting frame is vertically fixed to the bottom plates, a rotating shaft is arranged on the supporting frame, and the supporting frame is vertically and rotationally connected with a box body through the rotating shaft; climbing frame distance uniform adjusting mechanisms are arranged in the box bodies, a plurality of parallel climbing rods are connected between the climbing frame distance uniform adjusting mechanisms on the two sides, and long and narrow hollowed-out parts facilitating movement of one ends of the climbing rods are formed in the opposite side faces of the box bodies on the two sides. According to the climbing frame distance uniform adjusting mechanism, the X-shaped connecting rods and the Y-shaped connecting rods form the extensible connecting rod sets, the climbing rods are connected to the hinging sites in the middles of the connecting rod sets, and only one climbing rod needs to be lifted, the two ends of the climbing rod can drive the connecting rod sets on the two sides to extend at the same time through the hinging sites; therefore, the climbing rods connected to other hinged sites can also move along with the extension of the connecting rod group, the adjustment dimension is diversified, and the operation is simple and convenient.

Description

Technical Field

[0001] The present invention relates to the field of seedling cultivation, and specifically to an adjustable climbing frame for landscaping construction and an adjustment method thereof. Background Art

[0002] In the field of seed and seedling cultivation of protected agriculture and horticultural plants, as an important cultivation facility for vine plants (such as grapes, cucumbers, passion fruits, etc.), the rationality of the climbing frame structure directly affects the growth quality and cultivation efficiency of plants. The currently widely used fixed climbing frame system in the industry has significant technical defects, that is, a rigid frame structure constructed by welding or bolt fixing methods, and key parameters such as column spacing and crossbar height cannot be adjusted after installation. The following prominent problems are exposed in the actual application of this fixed structure: First, the growth adaptability is poor. There are significant differences in the requirements for climbing height and support density among different plant varieties (such as cucurbitaceae and leguminous plants) and different growth stages of the same plant (seedling stage and flowering and fruiting stage). The existing devices cannot achieve gradual adjustment of the support density, resulting in problems such as stem lodging and uneven light reception of the seed and seedling cultivation varieties due to the mismatch of the support; Second, adjustment and maintenance are difficult. When it is necessary to change the cultivation density or increase the fruiting height, the original support must be completely removed. When the vine plants are peeled off from the fixed support, the aerial roots are often broken and the phloem is damaged, which may seriously lead to the failure of the vine plant seedling cultivation.

[0003] Although the existing improved technologies have tried to adopt a modular splicing structure, there are still defects such as single adjustment dimension (only height or only spacing adjustable), poor connection stability, and high operation complexity (special tools are required for disassembly), and true non-destructive adjustment cannot be achieved. Therefore, designing a climbing frame with adjustable height and spacing without disassembly has become the key technical breakthrough for improving the cultivation efficiency of vine plant seeds and seedlings. Summary of the Invention

[0004] The purpose of the present invention is to provide an adjustable climbing frame for landscaping construction and an adjustment method thereof to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] An adjustable climbing frame for landscaping construction and an adjustment method, including bottom plates on both sides. A number of nail holes are penetrated through the bottom plates. Support frames are vertically fixed on the bottom plates. A rotating shaft is provided on the support frames, and the support frames are vertically rotatably connected to a box body through the rotating shaft. A mechanism for uniformly adjusting the spacing of the climbing frames is provided inside the box body. A number of climbing rods parallel to each other are connected between the mechanisms for uniformly adjusting the spacing of the climbing frames on both sides. Narrow and long hollow openings for the movement of one end of the climbing rod are provided on the opposite side surfaces of the box bodies on both sides. The mechanism for uniformly adjusting the spacing of the climbing frames includes a number of connecting rods hinged to form a connecting rod group. The connecting rod group includes an X-shaped connecting rod and a V-shaped connecting rod. The V-shaped connecting rod is formed by hinging the same-side ends of two connecting rods, and the X-shaped connecting rod is formed by hinging the middle parts of two connecting rods. The ends of adjacent X-shaped connecting rods in the connecting rod group are hinged to each other. The ends of the X-shaped connecting rods at both ends of the connecting rod group are both hinged to the ends of the V-shaped connecting rod. Among the hinge points of the above-mentioned connecting rod group, except for the lowermost hinge point which is a fixed point, the rest are movable points, and each movable point located on the central axis of the connecting rod group is fixedly connected to one end of the climbing rod. This central axis is consistent with the elongation-contraction direction of the connecting rod group. A climbing rod limiting component is provided on the outer side wall where the hollow opening of the box body is located. A rotation locking mechanism is provided on the rotating shaft of any one of the support frames.

[0007] In a further embodiment, the rotation locking mechanism includes a locking shaft coaxially fixed on the rotating shaft. An L-shaped support leg is provided on the support frame. One end of the locking shaft is rotatably connected to the part of the L-shaped support leg perpendicular to the bottom plate. A ratchet group is coaxially fixedly connected to the locking shaft. The ratchet group is composed of two ratchets with completely opposite orientations and pawls matching each ratchet. The pawls are elastically rotatably connected to the part of the L-shaped support leg parallel to the bottom plate.

[0008] In a further embodiment, the climbing rod limiting component is composed of a number of pairs of clamping protrusions symmetrically distributed on both sides of the hollow opening of the box body. A clamping groove is formed between the clamping protrusions and the outer side wall of the box body. During use, by placing a strip-shaped object in the clamping groove formed by one pair of clamping protrusions, the movement of the climbing rod can be restricted.

[0009] In a further embodiment, the box body is composed of an outer box body and an inner box body nested with each other. The top of the outer box body and the bottom of the inner box body are both in an unclosed state. Narrow and long hollow openings for the movement of one end of the climbing rod are provided on the side walls of both the outer box body and the inner box body, and one end of the climbing rod can move continuously from the hollow opening of the outer box body to the hollow opening of the inner box body. A clamping edge is provided at the top end of the inner side wall of the outer box body and the bottom end of the outer side wall of the inner box body. The clamping edge prevents the inner box body from completely falling out of the outer box body. A limiting component is provided on the inner box.

[0010] In a further embodiment, the limiting component includes a plurality of limiting through holes uniformly formed on the side wall of the inner box, and this side wall is an adjacent side wall to the side wall where the hollowing is located; during use, inserting a strip-shaped object into the limiting through holes can limit the inner box.

[0011] In a further embodiment, a lifting handle is further provided on the top of the inner box.

[0012] In a further embodiment, a rubber layer is covered on the inner side wall of the nail hole.

[0013] In a further embodiment, the climbing rod is composed of an outer rod and an inner rod that can telescopically move in the outer rod, and one ends of the outer rod and the inner rod are respectively connected to the evenly adjustable mechanism for the distance between the two climbing frames on both sides.

[0014] In a further embodiment, engaging edges are provided at the top of the inner side wall of the outer rod and the top of the outer side wall of the inner rod, and the engaging edges prevent the inner rod from completely disengaging from the outer rod.

[0015] An adjustment method for an adjustable climbing frame in landscaping construction includes the following adjustment steps:

[0016] Step 1: Adjust the overall length of the climbing rod by the telescopic amount of the inner rod of the climbing rod in the outer rod;

[0017] Step 2: After the adjustment is completed, use a fixing nail or other strip-shaped object to pass through the nail hole to fix the bottom plate on the ground;

[0018] Step 3: Adjust the rotation angle of the two box bodies together with the climbing rod by pressing the two pawls respectively. When the rotation angle is overly biased to one side, press one of the pawls so that the two box bodies together with the climbing rod can only rotate in the opposite direction, and vice versa. After the adjustment is completed, release the two pawls to keep them fixed to the ratchet, so as to complete the fixation of the angle of the box body together with the climbing rod;

[0019] Step 4: Adjust the distance between adjacent climbing rods by lifting or lowering the climbing rod. After the adjustment is completed, place a strip-shaped object in one of the clamping grooves close to the climbing rod to limit the movement of the climbing rod. In this step, the climbing rod does not include the one at the bottommost;

[0020] Step 5: When the height of the outer box body cannot meet the use requirements, pull up the inner box body by a certain height through the lifting handle, and insert a strip-shaped object into the limiting through holes of the inner box body to limit it, so as to extend the movement range of the climbing rod.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The climbing frame spacing uniform adjustment mechanism in the present invention consists of an extendable connecting rod group composed of X-shaped and Y-shaped connecting rods, and a climbing rod is connected to the hinge point in the middle of the connecting rod group. In this way, when it is necessary to simultaneously adjust the spacing between adjacent climbing rods and the overall height of the climbing rods, only one climbing rod needs to be lifted. The two ends of the climbing rod will drive the connecting rod groups on both sides to extend simultaneously through the hinge points, so that the climbing rods connected to other hinge points will also move with the extension of the connecting rod groups. The final effect is that while the spacing between adjacent climbing rods increases, the overall height of the climbing rods is also lifted. Progressive adjustment can be achieved during adjustment, and there is no need to disassemble the overall bracket, nor to completely strip the plants from the bracket. The adjustment dimension is diverse, the connection stability is strong, the operation is simple and convenient, and it can greatly improve the cultivation efficiency of vine plant seeds and seedlings;

[0023] 2. The present invention uses a bottom plate provided with a plurality of nail holes, and a rubber layer is fixed on the inner side wall of the nail holes. The plurality of nail holes can make the fixation of the bottom plate on the ground more reliable. The rubber layer ensures that when the fixing nail in the nail hole is not perpendicular to the bottom plate, the fixing nail will not shake in the nail hole. Therefore, multi-angle connection between the fixing nail and the bottom plate can be achieved, that is, when the bottom plate is placed obliquely, the fixing nail can maintain a vertical state to the maximum extent, maximizing the fixing effect;

[0024] 3. In the present invention, two ratchets and pawls with completely opposite orientations are used to achieve two-way adjustment and fixation of the rotation angle between the box body and the support frame, which is convenient for fine adjustment of the inclination angle of the box body and the climbing rod located between the two box bodies relative to the ground. Thus, when the device of the present invention is placed on the ground with different inclination angles, the climbing rod can always be adjusted and maintained in a vertical state, which is beneficial for fixing the growth direction during the cultivation of vine plant seeds and seedlings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 is Figure 1 an enlarged view of the structure at A in

[0027] Figure 3 is Figure 1 an enlarged view of the structure at B in

[0028] Figure 4 is a schematic diagram of the X-shaped and Y-shaped connecting rod structure of the climbing frame spacing uniform adjustment mechanism in the present invention;

[0029] Figure 5 is a schematic diagram of the engagement of the engaging edge between the outer box body and the inner box body of the present invention;

[0030] Figure 6Schematic diagram of the engagement edge between the outer rod and the inner rod in the present invention;

[0031] Figure 7 Schematic diagram of the fixed state of the present invention on a slope.

[0032] In the figure: 1, bottom plate; 2, nail holes; 3, support frame; 4, box body; 5, climbing rod; 6, X-shaped connecting rod; 7, V-shaped connecting rod; 8, locking shaft; 9, L-shaped support foot; 10, ratchet; 11, pawl; 12, clamping protrusion; 13, outer box body; 14, inner box body; 15, limit through hole; 16, lifting handle; 17, rubber layer; 18, outer rod; 19, inner rod; 20, fixing nail. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment example Figures 1-6As shown in the figure, this embodiment provides an adjustable climbing frame for landscaping construction and an adjustment method, which includes bottom plates 1 located on both sides. A number of nail holes 2 are penetrated through the bottom plates 1. A support frame 3 is vertically fixed on the bottom plates 1. A rotating shaft is provided on the support frame 3, and the support frame 3 is vertically rotatably connected to a box body 4 through the rotating shaft. A climbing frame spacing uniform adjustment mechanism is provided in the box body 4. A number of climbing rods 5 parallel to each other are connected between the climbing frame spacing uniform adjustment mechanisms on both sides. Narrow and long hollow openings for the movement of one end of the climbing rod 5 are provided on the opposite side surfaces of the two box bodies 4 facing each other; the climbing frame spacing uniform adjustment mechanism includes a number of connecting rods hinged to form a connecting rod group. The connecting rod group includes an X-shaped connecting rod 6 and a V-shaped connecting rod 7. Among them, the V-shaped connecting rod 7 is formed by hinging the same-side ends of two connecting rods, and the X-shaped connecting rod 6 is formed by hinging the middle parts of two connecting rods. The ends of adjacent X-shaped connecting rods 6 in the connecting rod group are hinged to each other, and the ends of the X-shaped connecting rods 6 at both ends of the connecting rod group are both hinged to the ends of the V-shaped connecting rod 7; among the hinged points of the above-mentioned connecting rod group, except for the lowermost hinged point which is a fixed point, the rest are movable points, and one end of each climbing rod 5 is fixedly connected to each movable point located on the central axis of the connecting rod group. This central axis is consistent with the elongation-shrinkage direction of the connecting rod group. The climbing frame spacing uniform adjustment mechanism in this embodiment is composed of X-shaped and Y-shaped connecting rods to form an extendable connecting rod group, and the hinged points in the middle of the connecting rod group are connected to the climbing rods 5. In this way, when it is necessary to adjust the spacing between adjacent climbing rods 5 and the overall height of the climbing rods 5 at the same time, only need to lift one of the climbing rods 5, and both ends of the climbing rod 5 will drive the connecting rod groups on both sides to stretch simultaneously through the hinged points, so that the climbing rods 5 connected to other hinged points will also move with the stretching of the connecting rod group. The final effect is that while the spacing between adjacent climbing rods 5 increases, the overall height of the climbing rods 5 is also lifted. Progressive adjustment can be achieved during adjustment, and there is no need to disassemble the overall support frame, nor to completely strip the plants from the support frame. The adjustment dimension is diverse, the connection stability is strong, the operation is simple and convenient, and it can greatly improve the efficiency of cultivating seeds and seedlings of vine plants.

[0035] Among them, a rubber layer 17 is covered on the inner side wall of the nail hole 2 on the bottom plate 1. In this embodiment, the bottom plate 1 provided with a plurality of nail holes 2 is adopted, and a rubber layer 17 is fixed on the inner side wall of the nail hole 2. The plurality of nail holes 2 can make the fixation of the bottom plate 1 on the ground more reliable. The rubber layer 17 enables the fixing nail 20 not to shake in the nail hole 2 when the fixing nail 20 in the nail hole 2 is in a non-vertical state with the bottom plate 1. Therefore, multi-angle connection between the fixing nail 20 and the bottom plate 1 can be realized, such as Figure 7 As shown, when the bottom plate 1 is placed obliquely, the fixing nail 20 can maintain a vertical state to the maximum extent, achieving the maximum fixing effect.

[0036] Among them, a rotation locking mechanism is provided on the rotating shaft of the support frame 3 on either side. The rotation locking mechanism includes a locking shaft 8 coaxially fixed on the rotating shaft. An L-shaped support leg 9 is provided on the support frame 3. One end of the locking shaft 8 is rotatably connected to the part of the L-shaped support leg 9 perpendicular to the bottom plate 1. A ratchet group is coaxially and fixedly connected to the locking shaft 8. The ratchet group consists of two ratchets 10 facing in completely opposite directions and pawls 11 matching each ratchet. The pawls 11 are elastically rotatably connected to the part of the L-shaped support leg 9 parallel to the bottom plate 1. In this embodiment, two ratchets 10 facing in completely opposite directions and pawls 11 are used to achieve two-way adjustment and fixation of the rotation angle between the box body 4 and the support frame 3, which is convenient for finely adjusting the inclination angle of the box body 4 and the climbing rod 5 located between the two box bodies 4 relative to the ground. Thus, when the device of the present invention is placed on the ground with different inclination angles, the climbing rod 5 can always be adjusted and maintained in a vertical state, which is beneficial to fixing the growth direction during the cultivation of vine plant seeds and seedlings.

[0037] Among them, a climbing rod limiting component is provided on the outer side wall where the box body 4 is hollowed out. The climbing rod limiting component consists of several pairs of clamping protrusions 12 symmetrically distributed on both sides of the hollow of the box body 4. A clamping groove is formed between the clamping protrusions 12 and the outer side wall of the box body 4. During use, by placing a strip-shaped object in the clamping groove formed by a pair of clamping protrusions 12, the movement of the climbing rod 5 can be restricted. In this embodiment, after the height and spacing of the climbing rod 5 are adjusted, its position needs to be fixed. At this time, the climbing rod limiting component can timely fix the position of the climbing rod 5.

[0038] Among them, the box body 4 is composed of an outer box body 13 and an inner box body 14 nested with each other. The top of the outer box body 13 and the bottom of the inner box body 14 are both in an unsealed state. Long and narrow hollows for facilitating the movement of one end of the climbing rod 5 are provided on the side walls of the outer box body 13 and the inner box body 14, and one end of the climbing rod 5 can continuously move from the hollow of the outer box body 13 to the hollow of the inner box body 14. Clamping edges are provided at the top of the inner side wall of the outer box body 13 and the bottom of the outer side wall of the inner box body 14. The clamping edges prevent the inner box body 14 from completely falling out of the outer box body 13. A limiting component is provided on the inner box. The limiting component includes a number of limiting through holes 15 evenly opened on the side wall of the inner box, and this side wall is the adjacent side wall to the side wall where the hollow is located. During use, by inserting a strip-shaped object into the limiting through holes 15, the inner box can be limited. A lifting handle 16 is also provided on the top of the inner box. In this embodiment, when there is a further requirement for the overall height of the climbing rod 5 and the height of the outer box body 13 cannot meet the demand, the inner box body 14 can be pulled out of the outer box body 13 and the position of the inner box body 14 can be fixed by inserting a strip-shaped object into the limiting through holes 15, so as to further extend the stretching height of the climbing rod 5 and meet more diverse cultivation requirements for vine plant seeds and seedlings.

[0039] Among them, the climbing rod 5 is composed of an outer rod 18 and an inner rod 19 that can be telescoped in the outer rod 18. One end of the outer rod 18 and the inner rod 19 are respectively connected to the evenly adjustable mechanism for the spacing of the climbing frames on both sides. At the top of the inner side wall of the outer rod 18 and the top of the outer side wall of the inner rod 19, engaging edges are provided, and the engaging edges prevent the inner rod 19 from completely disengaging from the outer rod 18. In this embodiment, when the width of the climbing rod 5 cannot meet the requirements, the inner rod 19 can be pulled out of the outer rod 18 before the overall device is fixed on the ground, so as to further extend the width of the climbing rod 5 and meet the more diverse cultivation requirements of vine plant seeds and seedlings.

[0040] During use, first adjust the overall length of the climbing rod 5 by the telescopic amount of the inner rod 19 of the climbing rod in the outer rod 18; after the adjustment is completed, use the fixing nail 20 or other strip-shaped items to pass through the nail hole 2 to fix the bottom plate 1 on the ground; adjust the rotation angle of the two boxes 4 on both sides together with the climbing rod 5 through the two ratchets 10 facing in opposite directions and the two pawls 11 matching with each ratchet 10. When the rotation angle is overly biased to one side, press one of the pawls 11 to release the ratchet 10 engaged with it, while the other ratchet 10 and the pawl 11 matching with it make the two boxes 4 on both sides together with the climbing rod 5 can only rotate in the opposite direction, and vice versa. After the adjustment is completed, release the pawl 11 to keep it fixed to the ratchet 10, so as to complete the fixation of the angle of the box 4 together with the climbing rod 5; adjust the spacing between adjacent climbing rods 5 by lifting or pressing down the climbing rod 5. Here, the climbing rod 5 does not include the bottommost one. After the adjustment is completed, place a strip-shaped item in one of the clamping grooves close to the climbing rod 5 to limit the movement of the climbing rod 5; when the height of the outer box body 13 cannot meet the use requirements, pull up the inner box body 14 by a certain height by pulling the handle 16, and insert a strip-shaped item into the limit through hole 15 of the inner box body 14 to limit it, then the movement range of the climbing rod 5 can be extended.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable climbing frame for landscaping construction, characterized in that: It includes bottom plates (1) and support frames (3) located on both sides. A hollow box body (4) is vertically rotatably connected to the support frames (3). A climbing rod spacing uniform adjustment mechanism is provided in the box body (4). A number of climbing rods (5) parallel to each other are connected between the climbing rod spacing uniform adjustment mechanisms on both sides; Among them, the climbing rod spacing uniform adjustment mechanism includes a connecting rod group. The connecting rod group is composed of an X-shaped connecting rod (6) and a V-shaped connecting rod (7) hinged to each other. Among the hinged points of the above connecting rod group, each movable point located in the middle of the connecting rod group is fixedly connected to one end of the climbing rod (5).

2. The adjustable climbing frame for landscaping construction according to claim 1, wherein: A rotation locking mechanism is provided at the rotation connection between any one side support frame (3) and the box body (4). The rotation locking mechanism includes a locking shaft (8) coaxially connected with a pair of ratchets (10) with completely opposite orientations. A pawl (11) matching each ratchet (10) is connected to the support frame (3).

3. The adjustable climbing frame for landscaping construction according to claim 1, wherein: A climbing rod limiting assembly is provided on the outer wall where the box body (4) is hollowed out. The climbing rod limiting assembly is composed of clamping grooves symmetrically distributed on both sides of the hollow of the box body (4).

4. The adjustable climbing frame for landscaping construction according to claim 1, characterized in that: The box body (4) is composed of a hollow outer box body (13) and a hollow inner box body (14) nested with each other. The hollows on the outer box body (13) and the inner box body (14) enable one end of the climbing rod (5) to move continuously between the outer box body (13) and the inner box body (14).

5. The adjustable climbing frame for landscaping construction according to claim 4, wherein: A number of limiting through holes (15) are opened on the side wall of the inner box body (14). During use, a strip-shaped article is inserted into the limiting through holes (15) to limit the inner box. A lifting handle (16) is also provided at the top of the inner box body (14).

6. The adjustable climbing frame for landscaping construction according to claim 1, wherein: A number of nail holes (2) are opened on the bottom plate (1). A rubber layer (17) covers the inner side wall of the nail holes (2).

7. The adjustable climbing frame for landscaping construction according to claim 1, wherein: The climbing rod (5) is composed of an outer rod (18) and an inner rod (19) that can be telescopic with each other.

8. A method for adjusting an adjustable climbing frame for landscaping construction, according to the adjustable climbing frame for landscaping construction as described in any one of claims 1-7, characterized in that: It includes the following steps, Step 1: Adjust the overall length of the climbing rod (5) by the telescopic amount of the inner rod (19) of the climbing rod in the outer rod (18); Step 2: After the adjustment is completed, use a fixing nail (20) or other strip-shaped article to pass through the nail holes (2) to fix the bottom plate (1) on the ground; Step 3: Adjust the rotation angle of the box bodies (4) on both sides together with the climbing rods (5) by pressing the two pawls (11) respectively. When the rotation angle is overly biased to one side, press one of the pawls (11) so that the box bodies (4) on both sides together with the climbing rods (5) can only rotate in the opposite direction, and vice versa. After the adjustment is completed, release the two pawls (11) to keep them fixed to the ratchets (10), thereby completing the fixation of the angle of the box body (4) together with the climbing rods (5); Step 4: Adjust the spacing between adjacent climbing rods (5) by lifting or pressing the climbing rods (5). After the adjustment is completed, place a strip-shaped article in one pair of clamping grooves close to the climbing rods (5) to limit the movement of the climbing rods (5). In this step, the climbing rods (5) do not include the one at the bottommost; Step Five: When the height of the outer box body (13) cannot meet the usage requirements, pull up the inner box body (14) by a certain height through the lifting handle (16), and insert a strip-shaped object into the limit through hole (15) of the inner box body (14) to limit it, then the moving range of the climbing rod (5) can be extended.

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