CN101102821B - A trampoline - Google Patents

Abstract

A trampoline including a flexible mat (1) and a plurality of resiliently flexible rods (2) the lower ends of which are retained in a frame (3) of the trampoline and the upper ends of which are coupled to the mat (1) about a periphery of the mat to support the mat, in which the rod stiffness against bending is greater than about 1200 and up to about 3000 N/m and the rods (2) are deflected at the upper ends of the rods, from a natural state of rest when the rods are in the position in the frame (3) at their lower ends but before connection with the mat edge at their upper ends to connection with the mat, by up to about 450mm.

Description

Trampoline

Technical field

The present invention relates to be used for the improvement of the trampoline of sports and/or amusement, with respect to common trampoline, this trampoline is soft limit, and common trampoline is by the mat of firm peripheral frame and the spring-loaded trampoline that exposes between framework and mat.

Background technology

US 6,319,174 disclose a kind of trampoline form of soft limit, wherein the mat of trampoline is by a plurality of resilient flexible link supportings, the lower end of flexible link is received in the trampoline framework, the upper end of flexible link is connected to the periphery of the spring mat of trampoline, and this trampoline does not need firm framework to be located at the outside of spring mat and at the spring of the exposure of framework and mat periphery.

Summary of the invention

The invention provides this soft limit trampoline of form improved or that replace at least.

Put it briefly, an aspect of of the present present invention provides a kind of trampoline, comprise a flexible mat and a plurality of resilient flexible link, the lower end of flexible link is maintained in the framework of trampoline, the upper end of flexible link is connected with mat with the supporting mat around the periphery of mat, and the bending rigidity of its king-rod is also can be up to about 3000N/m greater than about 1200N/m.

Preferably, be connected with mat to the upper end from natural laying state (bar is arranged in the correct position of framework with the lower end but its upper end is not connected with mat edge), on the bar deflection greater than about 300mm up to about 450mm.

According to the present invention, the bar of supporting mat is deflection, thereby applied radially or laterally the load of outside the best be used for the common function of trampoline with tensioning mat suitably, and simultaneously the length of bar and diameter give mat edge enough flexible, absorb impact and to may the vertical rigidity that drop on the spring person at edge with security out of hand.

In specification (comprising claims), the springboard of so-called bouncer planned to extend in term " trampoline ", also relates to the big trampoline of all sizes.Trampoline of the present invention is circular, square, rectangle or other shape, is octahedral shape as plane.

The term of using in specification and claims " comprises " and being meant " being made of it to small part ".That is to say that when explanation comprised the independent claims of this term, the characteristics that begin for this term needed to exist in each claim, but other characteristics can exist also.

Description of drawings

Below by not further specifying the present invention referring to accompanying drawing, in the accompanying drawing as the example that limits:

Fig. 1 is the perspective view of the trampoline of preferred form;

Fig. 2 is the side view of the trampoline of Fig. 1;

Similar Fig. 1 of Fig. 3, but only show a side of trampoline, and an edge part that shows trampoline cut layer and

Fig. 3 a shows the enlarged drawing of the marginal portion that trampoline cuts;

Fig. 4 shows the bar deflection at trampoline edge and measures;

Fig. 5 shows edge and the bar rigidity of mat performance and the scope of bar deflection that reaches requirement of the present invention;

Fig. 6 show the cantilever lever that is used for formula given below sign flag and

Fig. 7 illustrates the long relation with diameter of the bar of GRP bar of the rigidity shown in reaching.

The specific embodiment

Comprise the flexible mat 1 that the user bounces thereon referring to Fig. 1-3, preferred trampoline, a plurality of resilient flexible link 2 and bottom framework 3.The trampoline of shown preferred form is circular, but trampoline can be other shape, as oval, square, rectangle or similar shape.

The bottom framework 3 of the trampoline of preferred form comprises a circular beam 4 that is formed by for example steel or aluminium, and circular beam 4 is bearing on the ground by leg 5.

Bar 2 is fiberglass pole typically, and can be the plastic bar that pultruded (pultrusion) glass strengthens, but also can be to be made by for example spring steel.The lower end of bar is kept by bottom framework 3, and the upper end of bar is connected (following will the explanation) with joint 6.Joint 6 is connected to the periphery of mat 1.In a preferred form, the lower end of bar 2 enters into the tubular holders 7 (as shown) that is fixed to circular beam, but the lower end of bar 2 can be connected to the bottom framework of the trampoline of circular beam or any other form in any suitable manner.

In a preferred form, the mat of the synthetic material of heavy typically canvas or braiding is reflexed own and for example sews on and fix to be formed on the continuous pocket 8 that the mat periphery extends at the periphery of mat.A plurality of joints 6 are located in the pocket along the periphery of mat, especially shown in Fig. 3,3a.Joint can loose ground remains in the pocket or can be sewn on the mat in the edge pocket, perhaps can be mechanically fixed on the mat by for example rivet.

Each has spherical upper end 12 bar of preferred form, and this upper end 12 is connected in the socket cavity below a joint 6.Typically, joint 6 is formed by for example injection moulding by plastic material.Joint can randomly comprise a gentle slope domeshape on the joint body above the socket cavity of joint downside.In addition, in a preferred form, joint has in use an outward flange near the neighboring of mat, this outward flange is wideer than the inward flange of joint at planar section, therefore joint has approximate truncated triangles shape and sees to have concave side edges from plane, but this is not restrictive, and joint also can have other shape.

From its component construction trampoline the time, after assembling bottom framework 3 on request, insert in the sleeve 7 lower end of bar 2.At this moment, the upper end of bar is to make that freely each bar will be at a non-inflection point, and is indicated as the 2a of Fig. 4.Subsequently, mat 1 is placed on framework and the bar, and the upper end of each bar is connected on the joint 6 one by one at the periphery of trampoline.In beginning after several bars have connected, subsequently afterwards when the upper end of each bar is connected on the mat of trampoline, bar will inside center towards trampoline deflects into the inflection point shown in the 2b of Fig. 4.When the upper end of all bars all when the periphery of mat is connected on the joint, all bars are in inflection point 2b.Distance between the not inflection point (indicating as 2a) of the upper end of each bar at its inflection point (as 2b indication) with when not being connected (mat is being fixed by other bar) with mat is the deflection x (as shown in Figure 4) of bar.According to the present invention, this deflection is up to about 450mm, preferably between about 300-450mm.Simultaneously, the bar rigidity that is chosen to make bar that anti-cantilever bending be arranged is between about 1200-3000N/m.

Typically, the length of bar is between 0.1-1.5m, more typically between about 0.5-1 rice.

We find that such trampoline has good balance quality, at first, have enough vertical rigidity to make when a leaper drops on the edge at the edge of mat, the edge can " not subside ", secondly, the cross directional stretch mat is so that when the leaper takeoffs in mat central authorities, the anti-pumping performance that can provide.That is to say that in these parameters, bar is deflected and makes that applying optimum load radially outwardly jumps over performance with the trampoline that the stretching mat provides.Simultaneously, the length of bar and diameter give mat edge one vertical rigidity, its be enough flexible, absorb to impact and be safe to the spring person who drops on the edge out of hand.Fig. 5 draws these two measurements that limit the scope of the invention.

Below further analyze the rigidity of using the bar that provides above:

At first, use simple cantilever deflection formula.Sign flag is shown among Fig. 6, and limits as follows.Deflection x is provided by following formula:

$x=\frac{{\mathrm{<figure-callout\; id="3"\; label="SL"\; filenames="H05846951120070724E000021.png,H05846951120070724E000041.png"\; state="\{\{state\}\}">SL</figure-callout>}}^3}{3\mathrm{EI}}$ (formula 1)

In the formula, second moment of area I is provided by following formula:

$I=\frac{\mathrm{\&pi;}{d}^4}{64}\&CenterDot;C_I$ (formula 2)

Rigidity k can be derived by formula 1:

$k=\frac{S}{x}=\frac{3\mathrm{EI}}{L^3}$ (formula 3)

Following formula can launch to obtain with formula 2:

$k=\frac{3\mathrm{E\&pi;}{d}^4}{64{\mathrm{<figure-callout\; id="3"\; label="L"\; filenames="H05846951120070724E000021.png,H05846951120070724E000041.png"\; state="\{\{state\}\}">L</figure-callout>}}^3}\&CenterDot;C_I$ (formula 4)

Rescheduling once, the length of bar can be derived by following formula:

$L=\sqrt[3]{\frac{3\mathrm{E\&pi;}{d}^4}{64k}\&CenterDot;C_I}$ (formula 5)

Suppose that rigidity k is known, as described above, the rigidity of nominal is 700N/m, and C _IValue as below provide, then for arbitrary given shank diameter d and Young's modulus E, can calculate the length L of bar by formula 5.

In the formula:

The second moment of area of I-actual measurement (, GRP being proofreaied and correct) (m as suitable ⁴);

The sharp load (N) of S-bar;

L-is from the drift (m) of the bar that exports to ball center of pod;

D-shank diameter (m);

C _I-to the correction coefficient of the I value of actual measurement

(for glass ingredient is the pultruded GRP of 70%+, C _I=0.83; And for the homogeneous material as steel and so on, C _I=1);

The deflection of x-bar point is perpendicular to undeflected center line (m);

The E-Young's modulus is (to the GRP bar, E=41Gpa);

" spring rate " of k-cantilever typically is 700N/m.

Range in stiffness for bar is 1200N/m-3000N/m, and the rigidity of nominal is 2000N/m, and the formula 5 of an example is plotted among Fig. 7.This is to be used for the pultruded bar that glass strengthens.Other figure of other material require limits the relation of length and diameter.Fig. 7 shows the combination of the pole length and the shank diameter of performance is provided according to trampoline of the present invention edge.Have the initial deflection x (nominal ground is 220mm) of regulation, these combinations will give the performance of trampoline mat the best simultaneously.

Therefore, the figure shows the combination that reaches mat tension and two desired bars of key function of edge stiffness.Adopt different materials in the same mode shown in the example, but use suitable Young's modulus E and coefficient C _ICan reach this two functions.

The present invention who comprises preferred form has been described above.Conspicuous replacement of those skilled in the art and remodeling are also planned to be combined in the scope of the invention of appending claims qualification.

Claims (7)

1. trampoline, comprise a flexible mat and a plurality of resilient flexible link, the lower end of described flexible link is maintained in the framework of trampoline, the upper end of described flexible link is connected with mat with the supporting mat around the periphery of mat, and the bending rigidity of its king-rod is for can reach 3000N/m greater than 1200N/m and maximum.

2. according to the trampoline of claim 1, the length that it is characterized in that bar is 0.3-1.5m.

3. according to the trampoline of claim 1, the length that it is characterized in that bar is 0.45-1m.

4. according to the trampoline of claim 1, it is characterized in that described bar is the extruding fiberglass bar.

5. according to the trampoline of claim 2, it is characterized in that described bar is the extruding fiberglass bar.

6. according to the trampoline of claim 3, it is characterized in that described bar is the extruding fiberglass bar.

7. according to any described trampoline in the claim 1 to 6, it is characterized in that, but the natural laying state that the correct position bar upper end that is arranged in framework from the bar lower end is not connected with mat edge is connected with mat to the bar upper end, and bar upper end deflection can reach 450mm greater than 300mm and maximum.

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