FLAT ROLLING STRUCTURE FOR ROLLING UP A NET BODY
The net structure with hard protruding ends and a reel mechanism with positioning rollers addresses the setup challenges of ball nets, enabling easy and stable deployment and retraction.
Patent Information
- Application Number
- DE102023115846
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2023-06-16
- Publication Date
- 2025-10-02
- Estimated Expiration
- 2043-06-16
AI Technical Summary
Existing ball nets for sports are cumbersome to set up, prone to entanglement, and require manual assistance for rolling due to weak support at ends and gravity-induced hanging.
A net structure with hard protruding objects at ends, guided by a reel mechanism with positioning rollers, allowing for easy expansion and rolling up, facilitated by a torsion spring for automatic winding.
Enables quick, stable deployment and retraction of the net without tangling, reducing manual effort and ensuring consistent support during use.
Smart Images
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Abstract
Description
TECHNICAL FIELD
[0001] This invention relates to a flat structure for rolling up net bodies, particularly, it relates to a net body having a simple expansion or rolling up device installed on the rolling up structure, on the upper cap and the lower cap of the rolling up structure, it is installed with a rolling up device which is used to fix the position of the net body, and by pulling or retracting the net body, the net body can be quickly taken out or expanded when the net body is to be taken up, through the roller of the rolling up structure and with the support of the positioning structure, the net body can be rolled up and taken up flat in the roller. BACKGROUND
[0002] Ball sports are always sports favored by Taiwanese residents, especially in recent years, some local athletes have topped the world rankings in tennis and badminton one after another, so during holidays, you can see people practicing tennis, badminton, or even volleyball in the stadium or even in parks.
[0003] For the above sports, in addition to the ball and racket, a net is also needed to divide the playing field into two sides; in the current form, users need to prepare a ball net, and after the net is expanded, it should be installed or fixed on ball racks with ropes at both ends; however, the above structure has the disadvantages of: 1. Many net grids form the ball net and net body, and because the ball net and net body themselves have a soft structure, they are easy to get tangled and tied together, and it is very time-consuming to arrange them; 2. Every time they are used, the ball net and net body need to be expanded, which is very time-consuming.
[0004] Document US 2005 / 0173078 A1 discloses a retractable pet screen and shows a roll-up structure for flatly rolling up a mesh body having the features of the preamble of claim 1. Document IT PV 20110012 A1 further describes a waterproof canvas device designed to protect exterior doors of houses from splashes.In addition, some companies have developed a structure as shown in the applied-for Chinese patent CN217187773U, wherein the first support column is hollow inside and has an opening in the side part; a rotating rod rotatably installed in the first support column, and a ball net, one end of which is first fixed to the rotating rod so that when the rotating rod rotates, the ball net is wound in the opening of the first column; a base fixed to the bottom of the first column; further, the rotating rod is driven to rotate by a driving and rotating component installed on the base and located at the bottom of the rotating rod.When it is necessary to rotate the rotating rod to take up or release the ball net, the driving and rotating component can drive the rotating rod to rotate within the first supporting column and realize the winding or unwinding of the ball net at the opening of the first supporting column; However, the disadvantages of the above structures are as follows: 1. Because the ball net is fixed on a first supporting pillar, the upper and lower ends of the ball net have weaker supporting force, so that the ball net is skewed or curled; 2. When the ball net is to be rolled up, the ball net will sag due to gravity, therefore, without the help of other people when rolling up, the ball net will be knotted or sometimes it will be difficult to roll up. Summary of the invention
[0005] The main purpose of this invention is to provide a flat structure for rolling up the net body, which aims to improve the prior art ball net or the rolling structure for the net body. A hard and protruding object is attached to the upper and lower ends of the net body, respectively, to roll up the net body on a roller. Moreover, the above-mentioned roller is mounted between an upper cap and a lower cap. Furthermore, a positioning roller set is arranged in the upper and lower cap to limit the movement of the protruding object. Therefore, the positioning roller set limits the range of movement of the net body, consequently the ball net or the net body can be expanded or flattened in the roll.
[0006] Therefore, the structure of the present invention as defined in claim 1 consists of a net body and a winding mechanism.
[0007] The net body has a grid-shaped net surface, and the upper and lower ends of the net surface are each provided with a border strip made of canvas, and a hard, protruding object is attached to the border strip.
[0008] One side of the net body is connected to the winding mechanism and is driven by the winding mechanism to expand or retract the net body.
[0009] The net body is provided with a straight pull-up part on one side, which is connected to the winding mechanism, and a columnar body above the pull-up part. By holding the columnar body of the pull-up part, the net body can be retracted flat or rolled up.
[0010] The winding mechanism includes a spool, a top cap, a bottom cap and a connecting lever.
[0011] The above-mentioned coil includes an inner shaft, and the inner shaft is coupled with the upper cap and the lower cap, so that the inner shaft can rotate between the upper cap and the lower cap;
[0012] The outer side of the inner shaft is equipped with an outer drum for rolling up and fixing by the net body, and the outer drum is coupled with the above-mentioned inner shaft, so that the outer drum can rotate together with the inner shaft.
[0013] The top cap is attached to the top of the spool, and on the inside of the top cap, it is provided with an upper shaft connecting part, an upper roller positioning part, and an upper connecting pipe.
[0014] The upper shaft connecting part can provide a coupling for the inner shaft of the spool.
[0015] The upper roller positioning part is equipped with an upper positioning roller set;
[0016] The above-mentioned upper positioning roller set includes two sets of upper positioning rollers, and the edge strip on the top side of the net body penetrates into the upper positioning roller set; and between these two upper positioning rollers, an upper position limiting part is formed for limiting a protruding object at the top end of the net body, and the width of the upper position limiting part is slightly larger than the protruding object, so that the protruding object can move within the upper position limiting part without separating from it, and an upper opening is set up on the upper cap at the front end of the upper positioning roller set, in addition, when the net body is wound up, the columnar body of the pulling part can stop and block at the front end of the upper positioning roller set.
[0017] The upper connecting tube can serve as a coupling for the connecting lever.
[0018] The lower cap is installed at the lower end of the spool, and on the inside of the lower cap, it is installed with a lower shaft connecting part, a lower roller positioning part and a lower connecting pipe.
[0019] The lower shaft connecting part provides the coupling for the lower end of the inner shaft of the spool.
[0020] The lower roller positioning part is equipped with a lower positioning roller set.
[0021] The above-mentioned lower positioning roller set includes two sets of lower positioning rollers, and the edge strip at the lower end of the net body penetrates into the lower positioning roller set; and between these two lower positioning rollers, a lower position limiting part for limiting a protruding object at the lower end of the net body is formed, and the width of the lower position limiting part is slightly larger than the protruding object, so that the protruding object can move within the lower position limiting part without separating from it, and the lower cap is installed with an opening at the front end of the lower roller positioning part.
[0022] The lower connecting tube serves as a coupling for the connecting lever.
[0023] The projecting object at the upper and lower ends of the net body respectively penetrates into the upper position limiting part of the above-mentioned upper positioning roller set and the lower position limiting part of the above-mentioned lower positioning roller set, so that the net body can expand flatly under limitation by the upper position limiting part and the lower position limiting part or can be wound flatly in the coil.
[0024] In one embodiment of the present invention, the projecting object is a nylon rope. In one embodiment of this invention, the upper cap and the lower cap are each installed with a connecting ring part, and each of the connecting ring parts can be penetrated by a rope body. Therefore, when the structure of this invention is to be fixed, the above-mentioned rope body is placed on each of the connecting ring parts. Further, the rope body is fixed to the floor or mounting frame of the ball game, thus allowing stable use of this invention.
[0025] In one embodiment of this invention, the lower cap having a through hole is installed on the lower connecting pipe, and the connecting lever is a retractable rod that can take out the connecting lever from the through hole and fix this invention.
[0026] In one embodiment of the present invention, the lower cap is provided with a through hole on the lower connecting pipe, and the above-mentioned through hole can be penetrated by a fixing rod.
[0027] In one embodiment of this invention, the edge strip is folded to form a folded edge, and the folded edge is connected to the edge strip, and then the projecting object is wrapped, thereby fixing the projecting object and preventing it from falling off.
[0028] In one embodiment of this invention, the edge strip may be plastic injection molded to cover the edge of the mesh surface.
[0029] In one embodiment of this invention, the edge strip may adopt the thermocompression technique to cover the edge of the mesh surface, and the above-mentioned edge strip, the mesh surface and the projecting object may be formed together by the thermocompression method.
[0030] In one embodiment of this invention, the inner shaft is installed with a torsion spring, and one side of the torsion spring is embedded in an inner slot of the inner shaft, and the torsion spring is set to a predetermined length. On another side, the torsion spring is installed with a common end, and the common end is fixed to an outer slot of the outer drum. Therefore, by utilizing the elasticity of the torsion spring, when the net body is expanded, the torsion spring is released in a length so that the net body can expand. Moreover, when the net body is rolled up, the torsion spring is elastically released so that the net body rolls up automatically.
[0031] In one embodiment of this invention, another rotating handwheel is installed on the outside of the top cap, and the aforementioned rotating handwheels are connected to the upper shaft connecting part of the reel. By driving the rotating handwheel, the net body can be extended, or the user can manually rotate the rotating handwheel so that the net body can be wound onto the reel.
[0032] Based on the above descriptions, the features of this invention and its available functions are briefly described as follows: 1. When using it, hold the pulling part to take out the net body, because the protruding object at the top and bottom of the net body is limited in its moving position by the upper positioning roller set and the lower positioning roller set attached to the upper cap and the lower cap, therefore the net body can be taken out as a straight line. 2. When the net body is to be wound up, by limiting the moving position of the above-mentioned protruding object by the upper positioning roller set and the lower positioning roller set, the net body can be wound up as a straight line, and together with the columnar body at the front end of the net body, the separation of the net body from the upper positioning roller set and the lower positioning roller set can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 shows a structural stereogram of the present invention. Fig. 2 shows a structural diagram of the mesh body. Fig. 3 shows a structural diagram of the winding mechanism. Fig. Figure 4 shows a structural disassembly diagram of the retractor mechanism. Fig. 5 shows a structural diagram of the top cap. Fig. 6 shows a structural diagram of the lower cap. Fig. Figure 7 shows a schematic drawing (1) of the application of this invention. Fig. Figure 8 shows a schematic drawing (2) of the application of the invention. DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
[0033] In order that the esteemed reviewer may better understand and appreciate the features of the present invention, the following improved embodiments are presented together with the drawings for description:
[0034] As in the Fig. 1 to 4, the structure of the present invention consists of a net body 10 and a winding mechanism 100.
[0035] As in the Fig. 1 and Fig. 2, the net body 10 has a lattice-shaped net surface 11, and the upper end and the lower end of the net surface 11 are respectively installed with a canvas edge strip 12 and 13; and on the respective edge strip 12 and 13, it is installed with a hard projecting object 121 and 131, and the above-mentioned projecting object may be made of a material of nylon rope and a hard and flexible strip object.
[0036] As shown in the first figure, one side of the net body 10 is arranged above the winding mechanism 100 and is driven by the winding mechanism 100 to expand or roll up and accommodate the net body 10.
[0037] As in Fig. 1 and Fig. 2, the net body 10 is installed with a straight pulling part 14 on a side relatively associated with the winding mechanism 100, and is installed with a columnar body 141 above the pulling part 14. By holding the columnar body 141 of the pulling part 14, the net body 10 can be retracted flat or rolled up.
[0038] Note that the edge strips 12 and 13 are folded into a folded edge (not shown in the figure), and the folded edge is connected to the edge strips 12 and 13 to cover the protruding object 121 and 131, so that the protruding object 121 and 131 is fixed and prevented from falling off. In addition to using the folded edge method to fix the protruding object 121 and 131, in some embodiments, each of the edge strips 12 and 13 may be made of plastic injection molding to cover the edge of the mesh surface 11, and then the protruding object 121 and 131 is incorporated into the edge strips 12 and 13.Furthermore, each of the edge strips 12 and 13 has adopted the thermocompression technique to cover the edge of the mesh surface 11; further, the above-mentioned mesh surface 11, the edge strips 12 and 13, and the projecting object 121 and 131 can be molded together by the thermocompression method.
[0039] As in the Fig. 1 and Fig. 2, one side of the net body 10 is located above the take-up mechanism 100 and is driven by the take-up mechanism 100 to expand or roll up and accommodate the net body 10.
[0040] As in the Fig. 1, Fig. 3 and Fig. 4, the winding mechanism 100 consists of a spool 20, an upper cap 30, a lower cap 40 and a connecting lever 50.
[0041] As in the Fig. 3 and Fig. 4, the above-mentioned spool 20 includes an inner shaft 21 and an outer drum 22, wherein the inner shaft 21 is connected to the upper cap 30 and the lower cap 40 so that the inner shaft 21 can rotate between the upper cap 30 and the lower cap 40.
[0042] As in the Fig. 3 and Fig. 4, the outer drum 22 is arranged on the outside of the inner shaft 21, and the outer drum 22 and the above-mentioned inner shaft 21 are coupled so that the outer drum 22 can rotate together with the inner shaft 21.
[0043] As in Fig. 3 and Fig. 4, the spool 20 in the main embodiment of this invention has adopted a spring winding mechanism to achieve the function of automatic winding; please refer further to Fig. 3 and Fig. 4, wherein the inner shaft 21 provides a place for the installation of the torsion spring 60, and for the body of the inner shaft 21, it has an inner slot 211, and one side of the above-mentioned torsion spring 60 is embedded in the inner slot 211 for fixing, and the other side of the torsion spring 60 is embedded in the outer slot 221 of the outer drum 22; when pulling the net body 10 installed on the spool 20, the outer drum 22 can rotate to achieve the purpose of expanding the net body 10; when releasing the net body 10, the torsion spring 60 is elastically released to further wind the outer drum 22, thus allowing the net body 10 to be wound and taken up into the spool 20.
[0044] The above-mentioned design method involves using a torsion spring 60 to enable automatic winding. Additionally, a rotary handwheel (not shown in the figure) may be mounted on the outer surface of the top cap 30, and the above-mentioned rotary handwheel is connected to the outer drum 22 of the reel 20. Under the drive of the rotary handwheel, the net body 10 can then expand, or the user can manually rotate the rotary handwheel to roll up the net body 10 and store it in the reel 20.
[0045] As in the Fig. 1, Fig. 3, Fig. 4 and Fig. 5, the upper cap 30 is attached to the upper end of the spool 20, and an upper shaft connecting part 31, an upper roller positioning part 32 and an upper connecting pipe 33 are attached to the inside of the upper cap 30.
[0046] As in the Fig. 1, Fig. 3, Fig. 4 and Fig. 5, the upper shaft connecting part 31 serves as a coupling point for the inner shaft 21 of the coil 20.
[0047] As in the Fig. 1, Fig. 3, Fig. 4 and Fig. 5, the upper roller positioning part 32 is equipped with an upper positioning roller set 34.
[0048] As in the Fig. 1, Fig. 3, Fig. 4 and Fig. 5, the above-mentioned upper positioning roller sets 34 include two sets of upper positioning rollers 341 and the edge strip 12 at the upper end of the net body 10 penetrates into the upper positioning roller set 34; and between these two upper positioning rollers 341, an upper position limiting part 342 is formed, which is used to limit a protruding object 121 at the upper end of the net body 10, and the width of the upper position limiting part 342 is approximately larger than the protruding object 121, therefore, the protruding object 121 can move within the upper position limiting part 342 without separating therefrom; furthermore, the upper cap 30 with an upper opening 301 is installed at the front end of the upper roller positioning part 32; furthermore, when the net body 10 is rolled up, the columnar body 141 of the pulling part 14 can easily stop and lock at the front end of the upper positioning roller set 34.
[0049] As in the Fig. 1, Fig. 3, Fig. 4 and Fig. 5, the upper connecting tube 33 provides a space for mounting the connecting lever 50.
[0050] As in the Fig. 1, Fig. 3, Fig. 4 and Fig. 6, the lower cap 40 is attached to the lower end of the spool 20, and a lower shaft connecting part 41, a lower roller positioning part 42 and a lower connecting pipe 43 are attached to the inside of the lower cap 40.
[0051] As in the Fig. 1, Fig. 3, Fig. 4 and Fig. 6, the lower shaft connecting part 41 serves to connect the lower end of the inner shaft 21 of the spool 20.
[0052] As in the Fig. 1, Fig. 3, Fig. 4 and Fig. 6, the lower roller positioning part 42 is equipped with a lower positioning roller set 44.
[0053] As in the Fig. 1, Fig. 3, Fig. 4 and Fig. 6, the above-mentioned lower positioning roller set 44 includes two sets of lower positioning rollers 441, and the edge strip 13 at the lower end of the net body 10 penetrates into the lower positioning roller set 44; and between these two lower positioning rollers 441, a lower position limiting part 442 is formed, which is used to limit the protruding object 131 at the lower end of the net body 10, and the width of the lower position limiting part 442 is slightly larger than the protruding object 131 so that the protruding object 131 can move within the lower position limiting part 442 without separating therefrom; and the lower cap 40 is installed with a lower opening 401 at the front end of the lower roller positioning part 42.
[0054] As in the Fig. 1, Fig. 3, Fig. 4 and Fig. 6, the lower connecting tube 43 provides a space for mounting the connecting lever 50.
[0055] As in the Fig. 1, Fig. 3, Fig. 4 and Fig. 6, the projecting objects 121 and 131 at the upper and lower ends of the net body 10 penetrate into the upper position limiting part 342 of the above-mentioned upper positioning roller set 34 and the lower position limiting part 442 of the above-mentioned lower positioning roller set 44, respectively, so that the net body 10 can be expanded flat under the limitation of the upper position limiting part 342 and the lower position limiting part 442, or can be rolled up and accommodated flat in the spool 20.
[0056] As in the Fig. 3 and Fig. 7, the lower cap 40 is formed with a through hole 431 on the lower connecting pipe 43, and the connecting lever 50 is a retractable rod used to take out the connecting lever 50 from the through hole 431 to fix the present invention.
[0057] As in Fig. 8, the upper cap 30 and the lower cap 40 are each installed with a connecting ring part 35 and 45, and each of the connecting ring parts 35 and 45 provides space for a rope body H to penetrate and hook. Therefore, when the structure of this invention is to be fixed, the above-mentioned rope body H penetrates and hooks each of the connecting ring parts 35 and 45, and then the rope body H is fixed on the floor or the fixing frame of the ball game, so that this invention can be firmly used.
[0058] As in Fig.8, according to the technique of the above-mentioned embodiment, for another embodiment, the lower cap 40 may be selected, and a through hole 431 is installed on the lower connecting pipe 43, and the above-mentioned through hole 431 may be penetrated by a fixing rod 70.
[0059] In summary, the structure of this invention has never been published in books or used in public, so it complies with the filing codes for patent inventions. [List of reference symbols] 10 mesh bodies 11 Network area 12, 13 verge strips 121, 131 Protruding object 14 train part 141 column bodies 100 winding mechanism 20 coil 21 Inner Wave 211 Inner slot 22 Outer drum 221 Outer slot 30 Upper cap 301 Upper opening 31 Upper shaft connecting part 32 Upper roller positioning part 33 Upper connecting pipe 34 Upper positioning roller set 341 Upper positioning rollers 342 Upper position limiting part 35 Connecting ring part 40 Lower cap 401 Lower opening 41 lower shaft connecting part 42 Lower roller positioning part 43 Lower connecting pipe 431 through hole 44 Lower positioning roller set 441 Lower positioning roller 442 Lower position limiting part 45 Connecting ring part 50 connecting levers 60 torsion spring 70 mounting rod H rope body
Claims
[1] A flat roll-up structure for flatly rolling up a net body (10), comprising a net body (10) and a roll-up mechanism (100); wherein the mesh body (10) contains a grid-shaped mesh surface (11); wherein one side of the net body (10) is connected to the winding mechanism (100) and is driven by the winding mechanism (100) to expand or roll up and receive the net body (10); the net body (10) is installed with a straight pulling part (14) on a side relatively connected to the winding mechanism (100), and a columnar body (141) is installed above the pulling part (14), wherein by holding the columnar body (141) of the pulling part (14), the net body (10) can be retracted or rolled up and taken up flat; the winding mechanism (100) comprises a spool (20), an upper cap (30), a lower cap (40), and a connecting lever (50); and the spool (20) has an inner shaft (21), and the inner shaft (21) is connected to the upper cap (30) and the lower cap (40) so that the inner shaft (21) can rotate between the upper cap (30) and the lower cap (40); characterized by , that at the upper end and at the lower end of a net surface (11) an edge strip (12, 13) made of canvas is attached, wherein a hard projecting object (121, 131) is attached to the edge strip (12, 13); an outer side of the inner shaft (21) is installed with an outer drum (22) for rolling up and fixing by the net body (10), and the outer drum (22) is connected to the inner shaft (21) so that the outer drum (22) can rotate together with the inner shaft (21); the upper cap (30) is installed at the upper end of the spool (20), and an inside of the upper cap (30) is installed with an upper shaft connecting part (31), an upper roller positioning part (32), and an upper connecting pipe (33); the upper shaft connecting part (31) is connected to the inner shaft (21) of the spool (20); the upper roller positioning part (32) is installed with an upper positioning roller set (34); the upper positioning roller set (34) comprises two sets of upper positioning rollers (341) and the edge strip (12) at the upper end of the net body (10) penetrates into the upper positioning roller set (34);and between the two upper positioning rollers (341), an upper position limiting part (342) is formed, which serves to limit a protruding object (121) at the upper end of the net body (10), and a width of the upper position limiting part (342) is slightly larger than the protruding object (121) so that the protruding object (121) can move within the upper position limiting part (342) without detaching therefrom, and the upper cap (30) is installed at the front end of the upper roller positioning part (32) with an upper opening (301), furthermore, when the net body (10) is rolled up and taken up, the columnar body (141) of the pulling part (14) can just stop and block the front end of the upper positioning roller set (34); the upper connecting tube (33) provides a location that can be installed by the connecting lever (50); the lower cap (40) is installed at the lower end of the spool (20), and a lower shaft connecting part (41), a lower roller positioning part (42), and a lower connecting pipe (43) are installed at an inner side of the lower cap (40); the lower shaft connecting part (41) is connected to a lower end of the inner shaft (21); the lower roller positioning part (42) is installed with a lower positioning roller set (44); the lower positioning roller set (44) has two sets of lower positioning rollers (441), and the edge strip (13) at the lower end of the net body (10) penetrates into the lower positioning roller set (44); and between the two lower positioning rollers (441), a lower position limiting part (442) is formed, which is used to limit the protruding object (131) at the lower end of the net body (10), and a width of the lower position limiting part (442) is slightly larger than the protruding object (131) so that the protruding object (131) can move within the lower position limiting part (442) without separating therefrom; and a lower opening (401) for the lower cap (40) is installed at the front end of the lower roller positioning part (42); the lower connecting tube (43) provides a location to be installed by the connecting lever (50); and the winding structure at the upper and lower ends of the net body (10) penetrates through the upper position limiting part (342) of the upper positioning roller set (34) or the lower position limiting part (442) of the lower positioning roller set (44), so that the net body (10) limited by the upper position limiting part (342) and the lower position limiting part (442) can expand flat or be rolled up and received flat in the spool (20). [2] A flat roll-up structure for flatly rolling up the net body (10) according to claim 1, wherein the roll-up structure comprises a nylon rope. [3] A flat winding structure for flatly winding the net body (10) according to claim 1, wherein the upper cap (30) and the lower cap (40) are each installed with a connecting ring part (35, 45), and each of the connecting ring parts (25, 45) can be penetrated by a rope body (H). [4] A flat roll-up structure for flatly rolling up the net body (10) according to claim 1, wherein the lower cap (40) is installed on the lower connecting pipe (43) having a through hole (431), and the connecting lever (50) is a retractable rod capable of taking out the connecting lever (50) from the through hole (431). [5] A flat roll-up structure for flatly rolling up the net body (10) according to claim 1, wherein the lower cap (40) is installed on the lower connecting pipe (43) with a through hole (431), and the through hole (431) can be penetrated by a fixing rod (70). [6] A flat roll-up structure for flatly rolling up the net body (10) according to claim 1, wherein the edge strips (12, 13) are folded to form a folded edge, and the folded edge is connected to the edge strips (12, 13) to cover the roll-up structure so that the roll-up structure can be fixed and prevented from falling off. [7] A flat roll-up structure for flatly rolling up the net body (10) according to claim 1, wherein the edge strips (12, 13) can be produced by plastic injection molding to further cover the edge of the net surface (11). [8] A flat roll-up structure for flatly rolling up the net body (10) according to claim 1, wherein the edge strips (12, 13) are formed by thermocompression to cover the edge of the net surface (11); and the edge strips (12, 13), the net surface (11) and the projecting object (121, 131) are formed together using a thermocompression method. [9] A flat rolling structure for flatly rolling up the net body (10) according to claim 1, wherein the inner shaft (21) is installed with a torsion spring (60), and one side of the torsion spring (60) is embedded in an inner slot (211) of the inner shaft (21), and the torsion spring (60) is installed with a predetermined length, a hinge end is installed in another side of the torsion spring (60), and the hinge end is fixed to an outer slot (221) of the outer drum (22). [10] A flat winding structure for flatly winding the net body (10) according to claim 1, wherein a rotatable handwheel is further installed on the outer side of the upper cap (30), and the rotatable handwheel is connected to the outer drum (22) of the spool (20).
Citation Information
Patent Citations
Ball net equipment for tennis and badminton training
CN217187773U
Retractable pet guard
US20050173078A1
CN000217187773U
IT20110012A
ITPV0020110012A