CN114870320A

CN114870320A - Bouncing type device with U-shaped elastic rod

Info

Publication number: CN114870320A
Application number: CN202110914411.1A
Authority: CN
Inventors: 王永琪; 王建武; 王思琪
Original assignee: Guangdong Feijiang Technology Co ltd
Current assignee: Guangdong Feijiang Technology Co ltd
Priority date: 2021-08-10
Filing date: 2021-08-10
Publication date: 2022-08-09

Abstract

A multifunctional device with U-shaped elastic rods comprises a frame, a plurality of elastic rods, a cushion and a protective net; a plurality of said resilient bars having their bottom portions mounted to said frame and their top portions attached to the perimeter or bottom perimeter of said mat to thereby bridge said mat over said frame; the bottom of the protective net is arranged at or near the periphery of the cushion and is supported upwards around the periphery of the cushion to form a closed space or a semi-closed space with an open top; the bending rigidity of the elastic rod is 200-10000N/m; the elastic rod is an arc elastic rod with a bending radian of 3-50 degrees. The multifunctional device provided by the invention provides a safety control for activities such as crawling, sitting, lying, jumping and the like, integrates multiple functions into a whole, and has a long service cycle.

Description

Bouncing type device with U-shaped elastic rod

Technical Field

The invention relates to the technical field of daily necessities, in particular to a bouncing type device, and particularly relates to a bouncing type multifunctional device with a U-shaped elastic rod.

Background

A common structure of a bouncing type device on the market, such as a trampoline, is that a jumping pad is erected on a frame through a spring or an elastic rod. In order to maintain good resiliency of the trampoline, the resilient bars must generally have a certain bending stiffness. The bending rigidity of the elastic rod is too high, so that when a player jumps on the mat, the player needs larger impact force to pull the elastic rod and store elastic potential energy, and the elasticity of the trampoline is poor. Too low a bending stiffness of the resilient rods tends to cause excessive relaxation of the mat of the trampoline and poor resilience of the trampoline. Additionally, the mounting and connection of the resilient rods to the frame and mat of the trampoline is a core problem of the trampoline. In prior art trampoline structures, the resilient rods are typically provided as straight rods, the top of which is attached and connected to the mat periphery by a fixed connection. For example, chinese utility model CN1277592C discloses a soft-edged trampoline comprising a flexible mat (1) supported in a base frame (3) by a plurality of resiliently flexible rods (2). Each rod (2) has an enlarged upper end (12). A plurality of fittings (6) are joined to the mat (1) around the periphery of the mat, each fitting (6) having a socket cavity (10) which receives an enlarged upper end (12) of a flexible rod so that the upper ends of the flexible rods are pivotally connected to the periphery of the mat. Trampolines of this type must be installed by overcoming the bending stiffness of the resilient rods to secure the fittings (6) in the socket cavities, requiring a significant amount of effort and difficulty in installation. Moreover, the fitting is prone to falling out of the socket cavity, which is a safety hazard.

Therefore, there is a need to develop a new solution to the problem of the difficulty in mounting and connecting the elastic rods and the mat and the trampoline frame in the conventional bouncing-type apparatus.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a bouncing type device with a U-shaped elastic rod, which is suitable for providing support and protection in activities such as crawling, sitting, lying, jumping and the like.

The technical scheme of the invention is as follows: the multifunctional device with U-shaped elastic rods comprises a frame, a plurality of U-shaped elastic rods and a cushion; a plurality of U-shaped elastic bars having bottom portions mounted on the frame and top portions connected to the periphery or bottom portions of the periphery of the mat to thereby bridge the mat over the frame; the U-shaped elastic rod is a single U-shaped unit formed by connecting at least two single arc-shaped elastic rods side by side and integrally connecting the upper end parts of the two arc-shaped elastic rods through a connecting rod or an arc-shaped elastic rod assembly formed by repeatedly arranging at least 2U-shaped units; the arc-shaped elastic rod has a bending radian of 3-50 degrees.

In each U-shaped unit, the free ends of the adjacent arc-shaped elastic rods are splayed; in the arc-shaped elastic rod assembly with at least 2 repeated U-shaped units, the free ends of two arc-shaped elastic rods at the outermost side are outwards expanded.

The bending rigidity of the arc-shaped elastic rod is 200-10000N/m; the rod diameter of the arc-shaped elastic rod is 0.3-5 cm.

The orthographic projection of the elastic rod is wholly or at least partially outside the frame.

The elastic rod is made of spring steel, aviation aluminum or aluminum alloy; the elastic rod is provided with a relatively hard core part and a relatively soft outer part wrapping the core part, the Rockwell Hardness (HRC) of the core part and the outer part are different by 0.1-2.5 degrees, and the grain size of the core part is larger than that of the outer part.

The cushion comprises a plurality of warps and a plurality of wefts which are woven in a staggered mode, wherein the warps are parallel to each other, and the wefts are parallel to each other; the warp and the weft are intersected with the periphery of the cushion at an acute angle.

The warp and the weft are parallel to the diagonal of the mat, respectively.

The mat further comprises a plurality of parallel first auxiliary lines; the first auxiliary lines, the warp lines and the weft lines are arranged in an acute angle staggered mode.

The cushion also comprises a plurality of parallel second auxiliary lines, and the second auxiliary lines, the warp lines and the weft lines are arranged in an acute angle staggered mode; the first auxiliary line and the second auxiliary line are parallel to the long side and the short side of the mat, respectively.

The periphery of the cushion is detachably connected with the top end of the elastic rod through a connecting piece; the connecting piece is provided with a U-shaped hook part, a mounting part and a flexible belt; a through hole is dug in the mounting part, and the flexible belt passes through the through hole and is fixed at or near the periphery of the cushion; the U-shaped hook part extends out from the installation part, and the connecting rod of the U-shaped unit is inserted into the U-shaped hook part to be matched and locked with the U-shaped hook part, so that the elastic rod is detachably connected with the cushion.

The invention has the beneficial effects that: the multifunctional device with the U-shaped elastic rod is characterized in that the U-shaped elastic rod is matched with the connecting piece with the U-shaped hook at the periphery of the cushion, the connecting piece can be detachably connected through the lock hook, and the bottom of the U-shaped elastic rod is installed in the frame through plug-in connection. After the installation is finished, the U-shaped elastic rod is not easy to fall off from the frame and the connecting piece, and the safety is high.

Description of the drawings:

fig. 1 is a structural view of a multi-function device having a U-shaped elastic bar according to the present invention.

Fig. 2 is a structural view of an elastic bar in the multi-functional apparatus having a U-shaped elastic bar according to the present invention.

Fig. 3 is another structural view of the elastic bar in the multi-functional device having the U-shaped elastic bar according to the present invention.

Fig. 4 is a top view of the multi-function device of the present invention having a U-shaped resilient lever.

Fig. 5 is a structural view of a frame and supporting legs of the multi-function device having a U-shaped elastic bar according to the present invention.

Fig. 6 is a structural view of a sleeve in a multi-function device having a U-shaped elastic bar according to the present invention.

Fig. 7 is a block diagram of a first embodiment of a mat in a multi-functional apparatus having U-shaped elastic bars according to the present invention.

Fig. 8 is a schematic view of a prior art mat.

Fig. 9 is a schematic view of the moment principle of the mat according to the present invention.

Fig. 10 is a schematic view of a mat according to the present invention.

FIG. 11 is a schematic view of another embodiment of a mat according to the present invention.

FIG. 12 is a schematic view of a structure of yet another embodiment of a mat according to the present invention.

FIG. 13 is a schematic view of a construction of yet another embodiment of a mat according to the present invention.

FIG. 14 is a schematic view of a construction of yet another embodiment of a mat according to the present invention.

FIG. 15 is a schematic view of a construction of yet another embodiment of a mat according to the present invention.

FIG. 16 is a schematic view of a construction of yet another embodiment of a mat according to the present invention.

FIG. 17 is a schematic view of a construction of yet another embodiment of a mat according to the present invention.

Fig. 18 is a side view of the multi-function device of the present invention having a U-shaped resilient lever.

Fig. 19 is a structural view of the multifunctional device having a U-shaped elastic bar according to another aspect of the present invention.

Fig. 20 is an enlarged view of fig. 19A.

Detailed Description

In order to make the object, technical solution and technical effect of the present invention more apparent, the present invention will be further described with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, the present invention provides a multi-functional apparatus having U-shaped elastic bars, including a frame 100, a plurality of U-shaped elastic bars 200, and a mat 300. The bottom of a plurality of the U-shaped elastic bars 200 are mounted on a frame 100, and the top of the U-shaped elastic bars 200 are attached to the periphery or the bottom of the periphery of the mat 300, thereby mounting the mat 300 on the frame 100.

In the multifunctional apparatus, the frame 100 is provided with the elastic bars 200 and is integrated. The U-shaped elastic bars 200 are used for erecting the mat 300 on the frame 100, converting impact force of a user on the mat 300 when jumping on the mat 300 into elastic potential energy to be stored, and then releasing the elastic potential energy instantly, so that the user can bounce; the mat 300 is used to support a user for jumping, sitting, lying, or crawling, walking, etc.

Preferably, the multifunctional apparatus further has a protection net, and the bottom of the protection net 400 is installed at or near the periphery of the mat 300 and is supported upward around the periphery of the mat 300 to form a closed space or a semi-closed space with an open top. The protection net 400 is used to protect a user from falling off the mat 300 when the user bounces, sits, lies, or crawls, learns to walk, etc. on the mat 300. The multifunctional device can be used for carrying out daily activities such as lying, sitting, playing, crawling and the like on the infant after the infant is born for several months. The mat 300 is separated from the ground due to the installation of the elastic bars 200, thereby providing a relatively clean activity space. Since the pad 300 has a mesh structure woven by the warp and the weft as described below, it is very convenient to clean even when an infant urinates or urinates thereon. The protection net 400 limits the range of movement of the infant, thereby protecting the infant from falling off the mat 300, and facilitating the guardian to observe the condition of the infant at any time. When the infant grows into a young child, which bounces due to its natural preference, even if the young child falls on the mat 300, there is no damage to the body or pain due to the elasticity of the mat 300 and the protection of the protection net 400. Teenagers or adults can also jump entertainment and fitness on the multi-functional device.

The elastic rod 200 is made of an elastic material and has a certain elasticity. When a user jumps on the mat 300, the mat 300 is pressed by a force, pulls the elastic bars 200, the elastic bars 200 are bent, stores elastic potential energy, and is then restored instantaneously, thus bouncing up the user. The bending rigidity of the elastic rod 200 is 200-10000N/m. Among them, infants or children have a small weight and a small strength. Therefore, the bending resistance of the elastic bars 200 is not so high that the mat 300 cannot pull the elastic bars 200 to store elastic potential energy when jumping on the mat 300. The bending resistance of the elastic bar 200 is also not small, otherwise, the elastic bar 200 is very easy to bend, cannot tension the mat, and the mat 300 is loose, cannot generate good elasticity, and forms a depression when sitting or lying. When the user is an infant or a child, the bending stiffness of the elastic rod 200 is preferably 200-.

Referring to fig. 1 and 2, the U-shaped elastic bar 200 has a certain curvature of 3 to 50 °, preferably 5 to 10 °. For this, the U-shaped elastic bar 200 must have the arc-shaped elastic bar 210. The inner arc of the arc-shaped elastic rod faces the direction of the cushion. Compared with a straight rod, the arc-shaped elastic rod is easier to further bend when stressed, and elastic potential energy is stored.

The diameter of the arc-shaped elastic rod 210 is generally 0.3-5 cm. The thicker the rod diameter of the arc-shaped elastic rod 210, the greater the bending difficulty, the too thin the rod diameter, and the weak supporting force, which is not conducive to tensioning the mat and supporting infants and children. When the user is an infant or a child, the recommended bending stiffness of the elastic rod is preferably 0.5-2cm,

referring to fig. 2 and 3, preferably, the U-shaped elastic bar 200 is an assembly 200' of at least two individual curved elastic bars 210 arranged side by side and integrally connected at upper ends thereof by a connecting bar 220 to form a single U-shaped unit or at least 2 repeated U-shaped units. The provision of the curved elastic bar assembly 200' simplifies the installation of the U-shaped elastic bars to the frame 100 below, facilitating the installation and connection of the mat 300 by the following connecting members 500. The connection between the curved elastic bar 210 and the connection bar 220 is preferably curved.

Preferably, in the single U-shaped unit, the free ends of the adjacent curved elastic bars are splayed, and in the repeated arrangement structure of the U-shaped units, the free ends of the outermost curved elastic bars are splayed to facilitate the curved elastic bar assembly 200' to be stably installed in the frame 100.

Referring to fig. 1 and 4, preferably, the bottom of the U-shaped elastic bar 200 is mounted on the frame 100, and the orthographic projection of the elastic bar 200 preferably falls at least partially or completely outside the area defined by the frame 100. In particular, the elastic bars 100 are outwardly expanded in a direction away from the mat 300 with respect to the frame 100, thereby enabling the installation of the mat 300 having a larger area than the area defined by the frame 100, increasing the activity space in the device. It should be understood that when the area of the mat 300 is smaller than the area defined by the frame 100, the elastic bars 300 may also be stretched inward relative to the frame 100 such that the orthographic projection of the elastic bars 200 falls at least partially within the area defined by the frame 100.

The elastic rod 200 is preferably made of spring steel, aviation aluminum or aluminum alloy and the like. The spring steel or aviation aluminum material is environment-friendly, not easy to break and low in price. Wherein the elastic rod 200 has a relatively hard core and a relatively soft outer portion wrapped around the core, the core and the outer portion have a difference in Rockwell Hardness (HRC) of 0.1 to 2.5 DEG, and the grain size of the core is larger than that of the outer portion. The preparation method is shown in Chinese patent CN202110356918. X. The elastic rod with the structure can be repeatedly bent without breaking, has excellent hardness and yield strength resistance, is not deformed and fatigue resistant, and has safe performance and stable structure.

Preferably, referring to fig. 5, the frame 100 is provided with a pair of mounting

holes

110a and 110b corresponding to each of the elastic bars, and the pair of mounting

holes

110a and 110b are respectively disposed on opposite sides of the frame, thereby facilitating insertion and installation of the elastic bars 200. In order to meet the structural requirement that the orthographic projection of the elastic rod 200 falls outside the frame 100, preferably, the pair of mounting

holes

110a and 110b are correspondingly arranged on the inner side and the outer side of the frame 100. Of course, this arrangement can also be used in the case where the orthographic projection of the elastic bar 200 falls within the frame 100.

Preferably, referring to fig. 2 and 3, a sleeve 120 is fixedly disposed in the pair of mounting

holes

110a and 110b, and the U-shaped elastic rod 200 is mounted by inserting the U-shaped elastic rod 200 into the sleeve 120, which is simple and convenient to operate. Preferably, a rubber cylinder 240 is further disposed in the sleeve 120. The elastic rod 200 is inserted into the rubber tube 240, and when the U-shaped elastic rod 200 slightly rotates in the sleeve 120, the rubber tube 240 can prevent the two from generating harsh friction sound due to friction, so as to realize silence.

Preferably, referring to fig. 6, the inner diameter of the bottom end 121 of the sleeve 120 is set to be smaller than the inner diameter of the main body 122 thereof, the outer diameter of the main body 122 of the sleeve 120 is larger than the aperture 110a of the mounting hole on the inner side of the frame, the outer diameter of the bottom end 121 of the sleeve is slightly smaller than the aperture of the mounting hole 110a on the inner side of the frame, and the outer diameter of the arc-shaped elastic rod is matched with the inner diameter of the main body 122 and is larger than the inner diameter of the bottom end 121 of the sleeve 120; so that the sleeve 120 cannot fall out of the frame 100 and the arc-shaped elastic rod cannot pass through the bottom end of the sleeve 120.

Preferably, referring to fig. 1, the periphery of the mat 300 is detachably coupled to the top ends of the U-shaped elastic bars 200 by means of a coupling member 500 described below. The multifunctional device with the U-shaped elastic rod according to the present invention may be designed in a rectangular, square, circular, oval or the like shape for the frame 100 to be placed in different spaces.

Preferably, the frame 100 is a rectangular frame or a square frame to which the mat 300 shaped like the frame is fitted. A hem 310 is preferably provided around the perimeter of the mat 300 that wraps around the perimeter of the mat 300. The periphery of the mat 300 is detachably coupled to the top ends of the elastic bars 200 by means of a coupling member 500 described below. When the mat 300 is provided with the skirting 310 at the periphery thereof, the connector 500 is preferably mounted on the lower bottom surface of the skirting 310.

Referring to fig. 7, the mat 300 includes a plurality of warp threads 1 and a plurality of weft threads 2 woven in a staggered manner, a plurality of the warp threads 1 being parallel to each other, and a plurality of the weft threads 2 being parallel to each other. The warp threads 1 and the weft threads 2 are arranged to intersect the periphery a of the mat 300 at an acute angle.

Compared to the warp and weft threads, respectively, arranged parallel to the periphery of the mat 300 as shown in fig. 8, the warp threads 1 and the weft threads 2 are arranged to intersect the periphery of the mat 300 at an acute angle, and the multifunctional means has better elasticity, and the principle thereof is explained as follows:

referring to fig. 9, when a player bounces on the mat 300, assuming that feet are dropped on any one of the drop points C of the mat 300, the warp 1 and weft 2 passing through the drop point C are pressed downward, both ends thereof generate a pulling force on the elastic bars 200 at the periphery of the mat, and the other warp and weft interlaced with the warp 1 and weft 2 passing through the drop point C are also pressed downward, both ends thereof also generate a pulling force on the elastic bars 200 at the periphery of the mat 300. These tensile forces combine to cause the elastic rod 200 to elastically deform, thereby storing elastic potential energy.

The elastic deformation of the elastic rod 200 depends on the applied moment, which is expressed by F × L, where F represents force and L represents force arm. The magnitude of the moment is determined by the pressure of the player on the cushion at the landing point, and the pressure is converted into the pulling force on the elastic rod, namely F, through the warp 1 and the weft 2; on the other hand, the distance L between the warp 1 or the weft 2 passing the drop point C and the elastic bar 200.

In the prior art shown in fig. 8, the warp threads 1 and the weft threads 2 are parallel to the long and short sides of the mat; in the embodiment shown in fig. 7, the warp threads 1 and the weft threads 2 are arranged to intersect the long and short sides of the mat at an acute angle. Referring to fig. 9, taking a rectangular cushion as an example, the maximum distance between any one of the falling points C and the periphery of the cushion is the distance from the falling point C to the four corners of the rectangular cushion, which is marked as L1; the vertical distance from the drop point C to the long side of the rectangular mat is marked as L2; the distance from the drop point C to the short side of the rectangular mat is designated L3. It is clear that L1> L2, L1> L3, and that theoretically the moments generated by the warp or weft threads to the mat when the same pressure F is applied to the warp or weft threads at the drop point C are F L1, F L2 and FL3, respectively, and it is clear that F L1> F L2, F L1> F L3, and thus it is known that, at the same pressure, the warp threads 1 and the weft threads 2 are arranged at an acute angle to the mat, and are able to apply a greater moment to the elastic rods 200 under the mat 300 than the warp threads 1 and the weft threads 2 are arranged parallel to the long and short sides of the mat, and are also converted into a greater potential energy, thereby providing the device with better elasticity.

In addition, when the player bounces at any one of the drop points C of the cushion, the warp threads 1 and the weft threads 2 at the position are pressed down by a certain magnitude, and the other warp threads and other weft threads around the position are also influenced to be pressed down by different magnitudes, wherein the closer the other warp threads and other weft threads are to the drop point C, the larger the pressed magnitude is, the farther the pressed magnitude is, and the influenced by the pressed magnitude is smaller. It is clear that the greater the magnitude of the depression, the greater the pulling force on the elastic bars under the periphery of the mat, and the smaller the pulling force on the elastic bars under the periphery of the mat. The warp 1 and weft 2 passing at any one of the drop points C can only pull the resilient bars under the periphery of the mat through their two ends, applying a torque to them. As shown in fig. 10, the warp 1 and the weft 2 are parallel to the long side and the short side of the mat 300, respectively, and pass through the warp 1 and the weft 2 at any one of the falling points C, so as to apply a moment e, f, g, h to the four corners of the mat 300, respectively. Also at the drop point C, when the warp 1 and the weft 2 intersect the long and short sides of the mat at acute angles, respectively, there are two intersections on one side a, i.e. the side exerts two moments g ', f', and the other two sides adjacent to the side exert moments e ', h', respectively. Obviously, in the case where F is the same, e ' > e, F ' > F, and F ' + g ' > F, h ' > g; therefore, the side edge a is subjected to a larger moment, so that the elastic rod under the side edge and the two adjacent corners of the side edge is subjected to relatively larger elastic deformation, stores more potential energy and has better elasticity.

Further, in the embodiment of FIG. 11, each of the warp or weft yarns forms a triangular or triangular-like structure with the perimeter of the mat 300, which is relatively more robust.

Preferably, referring to fig. 11, the warp threads 1 and the weft threads 2 are parallel to

diagonal lines

3a and 3b of the mat 300, respectively. When the warp 1 and the weft 2 are respectively arranged in parallel with the diagonal line of the rectangular cushion, when a player bounces at the central point D of the central area of the cushion, the warp and the weft at the central point are pressed down by certain amplitude under pressure, and the warp and the weft around the player are also influenced to be pressed down by different amplitudes. Because the central point D of the central area of the cushion and the warp and weft around the central point D are connected to the four corners of the trampoline or the long edges and the short edges close to the four corners, so that the four corners of the trampoline, the short edges and the long edges form moment, elastic deformation can be generated at the four corners and the elastic rods under the long edges and the short edges, the maximum elastic potential energy can be stored, and the central area of the trampoline has the best elasticity.

Preferably, the warp threads 1 and the weft threads 2 are arranged at 45 ° to the periphery of the mat.

In another embodiment of the invention, referring to fig. 12, the mat 300 further comprises a plurality of parallel first auxiliary lines 4; the first auxiliary lines 4 are arranged in a staggered manner at acute angles with the warp 1 and the weft 2. The first auxiliary lines 4 may be provided parallel to the long sides of the mat 300, or may be provided parallel to the short sides of the mat 300. Through the arrangement of the first auxiliary lines 4, after the cushion is stressed, the tension distribution of the elastic rods 200 under the cushion is more uniform, and the elasticity of the device is favorably improved.

In another embodiment of the invention, referring to fig. 13, the mat 300 further comprises a plurality of parallel second auxiliary threads 5, the second auxiliary threads 5 being arranged to cross the warp threads 1 and the weft threads 2 at acute angles. The first auxiliary line 4 and the second auxiliary line 5 are parallel to the long and short sides of the mat 300, respectively. Through the setting of second auxiliary line 5 for the mat is stressed the back, and is more even to the pulling force distribution of mat, is favorable to promoting the elasticity of device.

Preferably, as shown in fig. 16 and 17, the warp threads 1, the weft threads 2, the first auxiliary threads 4 and the second auxiliary threads 5 intersect at an angle of 45 °.

It will be appreciated that the braided wires of the mattress 300 may further add additional auxiliary wires, but this will certainly add weight to the mattress, thereby reducing its resiliency and increasing cost.

When the U-shaped elastic bars 200 at the four corners are subjected to a tensile force, the bottom of the U-shaped elastic bars 200 pushes the frame 100 inwards. Preferably, as shown in fig. 1 and 5, four corners of the square or rectangular frame 100 are preferably arc-shaped corners. The arc-shaped corners provide better stability than the right angles, making the frame 100 more stable, and also relatively reducing the stress of the frame bending towards the center due to tension. Preferably, the four corners of the square or rectangular frame 100 are preferably connected to two straight pipes 120 by at least one short straight pipe 130. This structure may be able to offset the pushing of the U-shaped elastic bar 200 against the frame 100 to some extent, thereby making the frame 100 more stable.

A plurality of supporting feet 600 are arranged below the frame 100, and the supporting feet 600 support the frame 100 to be separated from the ground. Preferably, the supporting feet 600 are disposed below four corners of the square or rectangular frame 100, or uniformly distributed below four corners of the oval frame 100, or uniformly distributed below the circular frame.

The support foot 600 may be a commercially available support foot structure. Preferably, the supporting foot 600 comprises a U-shaped member 610 and two insertion pipes 620 fixedly connected to the lower portion of the frame, and two free ends 611 of the U-shaped member are inserted into the two insertion pipes 620. The free ends 611 of the insertion tube 620 and the U-shaped member are respectively provided with corresponding threaded holes 621 and 622, and a locking screw 630 passes through the threaded holes 621 and 622 to lock and connect the insertion tube 620 and the U-shaped member. The cross bar 612 of the U-shaped member 610 is provided with a pad 640, the pad 640 wraps or partially wraps the cross bar 612, and the bottom of the pad 640 is provided with a pawl 641 to engage the ground. The U-shaped member 610 may be disposed vertically to the ground or may be disposed obliquely at an acute angle to the ground. The insertion tube 620 is arranged in a direction corresponding to the U-shaped member 610.

Preferably, referring to fig. 18, in order to adjust the height of the device, at least 2

screw holes

621a and 621b are provided on the insertion tube 620, which are arranged up and down. The height of the device is adjusted by adjusting the threaded

holes

622 and 621a or 621b locked by the locking screw 630. For example, the locking screw 630 locks the upper threaded hole 621a and the threaded hole 622a, and the device is located lower, and the locking screw 630 locks the lower threaded hole 621b and the threaded hole 622, and the device is located higher.

Preferably, universal wheels 140 are also provided on the frame 100 to facilitate the movement of the device. The universal wheel 140 has a generally conventional universal wheel structure, the structure and principle thereof should be well known to those skilled in the art, and the present invention is not described in detail herein.

Referring to fig. 19 and 20, the connection of the elastic bars 200 and the mat 300 is accomplished by the connection members 500. To accommodate the curved spring bar assembly described herein, the connector 500 described herein preferably has a U-shaped hook portion 510, a mounting portion 520 and a flexible strap 530. A through hole 521 is dug in the mounting part 520, and the flexible strap 530 passes through the through hole 521 and is fixed to the periphery of the mat 300 or the bottom surface of the lower edge 310 of the mat. The fixing means is preferably stitching. The U-shaped hook 510 extends from the mounting portion, and the connecting rod 200 is inserted into the U-shaped hook to be locked with the U-shaped hook, so that the arc-shaped elastic rod assembly is detachably connected with the cushion 300.

Preferably, the U-shaped hook 510 is provided with a convex pillar 511, the edge of the mat 300 is provided with a mesh, a flexible mat is arranged between the mesh and the edge, and the convex pillar 511 hooks the mesh, so that the edge covers the connecting member 500, and the trampoline is more beautiful.

The cushion 300 and the bottom of the protection net 400 are preferably connected by a zipper 401. Specifically, a connecting portion 301 extends from the cushion 300 along the peripheral attachment, and one side of the zipper 401 is coupled to the connecting portion 301 and the bottom of the protection net 400. The zipper has a generally conventional zipper structure, which is well known to those skilled in the art and will not be described herein in detail.

Referring to fig. 1, 19 and 20, the protection net 400 has a mesh structure formed by weaving flexible wires, and is configured to protect an infant from falling off a mat without being deformed even if the infant collides with the protection net in order to maintain the shape. For this, the protection net 400 must be tightened. A plurality of support rods 700 are arranged on the frame 100, a plurality of support rods 700 are arranged around the mat 300, a corresponding number of ties 410 are arranged at the top of the protection net 400, and each tie 410 is connected to the support rod 700, so that the protection net 400 is tensioned and expanded.

The protective net 400 is provided with a zipper door 420. Access to the device is provided through the zippered door 420.

The zipper door 420 may be formed in various shapes such as a line shape, a mouth shape or a U shape as desired. Preferably U-shaped.

The four corners of the frame 100 are respectively and fixedly provided with a mounting tube 101, the supporting rod 700 is a large arc-shaped rod, and the bottom of the supporting rod is inserted into the mounting tube 101 for fixation. Preferably, a reinforcing rib is arranged between the mounting pipe 101 and the frame 100 to reinforce the connection between the mounting pipe 101 and the frame 100. Specifically, the mounting tube 101 is a flat tube with an oval cross section, and the bottom of the support rod 700 is provided with two opposite flat surfaces 701 and two opposite arc surfaces 702, and after being inserted into the flat tube, the flat tube is matched with the flat tube and cannot rotate.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the present invention pertains, the architecture form can be flexible and varied without departing from the concept of the present invention, and a series of products can be derived. But rather a number of simple derivations or substitutions are made which are to be considered as falling within the scope of the invention as defined by the appended claims.

Claims

1. The multifunctional device with the U-shaped elastic rods is characterized by comprising a frame, a plurality of U-shaped elastic rods and a cushion; a plurality of U-shaped elastic bars having bottom portions mounted on the frame and top portions connected to the periphery or bottom portions of the periphery of the mat to thereby bridge the mat over the frame; the U-shaped elastic rod is a single U-shaped unit formed by connecting at least two single arc-shaped elastic rods side by side and integrally connecting the upper end parts of the single U-shaped unit through a connecting rod or an arc-shaped elastic rod assembly formed by repeatedly arranging at least 2U-shaped units; the arc-shaped elastic rod has a bending radian of 3-50 degrees; the orthographic projection of the elastic rod is wholly or at least partially outside the frame.

2. The multi-functional device of claim 1, wherein the free ends of adjacent curved resilient bars in a single U-shaped unit splay apart; in the arc-shaped elastic rod assembly with at least 2 repeated U-shaped units, the free ends of two arc-shaped elastic rods at the outermost side are outwards expanded.

3. The multi-functional device of claim 1, characterized in that the bending stiffness of the curved elastic rod is 200 to 10000N/m; the rod diameter of the arc-shaped elastic rod is 0.3-5 cm.

4. The multifunctional device with a U-shaped elastic rod according to any one of claims 1 to 3, wherein the elastic rod is made of spring steel, aircraft aluminum or aluminum alloy.

5. The multi-functional device of any one of claims 1-3, having a U-shaped resilient stem, wherein the resilient stem has a relatively hard core and a relatively soft outer portion surrounding the core, the core and the outer portion having a Rockwell Hardness (HRC) difference of 0.1 to 2.5 °, the core having a grain size larger than the outer portion.

6. The multi-functional device of claim 1, wherein said mat comprises a plurality of warp threads and a plurality of weft threads interwoven, said plurality of warp threads being parallel to each other and said plurality of weft threads being parallel to each other; the warp and the weft are intersected with the periphery of the cushion at an acute angle.

7. The multi-functional device of claim 5, wherein the warp and weft threads are parallel to the diagonal of the mat.

8. The multi-function device of claim 6, wherein said mat further comprises a plurality of parallel first auxiliary lines; the first auxiliary lines, the warp lines and the weft lines are arranged in an acute angle staggered mode.

9. The multi-functional device of claim 8, wherein the mat further comprises a plurality of parallel second auxiliary lines, the second auxiliary lines being arranged to be staggered at acute angles with respect to the warp and the weft; the first auxiliary line and the second auxiliary line are parallel to the long side and the short side of the mat, respectively.

10. The multi-functional device of claim 1, wherein the periphery of the mat is detachably connected to the top ends of the elastic bars by means of connectors; the connecting piece is provided with a U-shaped hook part, a mounting part and a flexible belt; a through hole is dug in the mounting part, and the flexible belt passes through the through hole and is fixed at or near the periphery of the cushion; the U-shaped hook part extends out from the installation part, and the connecting rod of the U-shaped unit is inserted into the U-shaped hook part to be matched and locked with the U-shaped hook part, so that the elastic rod is detachably connected with the cushion.