WO2011015208A1

WO2011015208A1 - Hydraulic lifting roller stand for a trampoline

Info

Publication number: WO2011015208A1
Application number: PCT/EP2009/005652
Authority: WO
Inventors: Dennis Hack; Johannes Maier
Original assignee: Eurotramp Trampoline - Kurt Hack Gmbh
Priority date: 2009-08-05
Filing date: 2009-08-05
Publication date: 2011-02-10
Also published as: EP2461878B1; EP2461878A1

Abstract

The invention relates to a lifting roller stand (2) for a trampoline (1) and comprises a stand part having a guide, the stand being supported on rollers. A guide element that can be fixed on the trampoline (1) is arranged in the guide so that the height of the guide element can be adjusted. The guide element has an adapter (8) for fixing on the trampoline (1) and an actuating element for adjusting the height of the guide element. A hydraulic unit (12) is provided as means for height adjustment. The actuating element for actuating the hydraulic unit (12) is a pedal (11).

Description

HYDRAULIC HEBEROLLSTÄNDER FOR A TRAMPOLIN The invention relates to a lifting stand for a trampoline.

With Heberoll pedestals of the type in question storage and transport of trampolines is possible. Suitable for this are collapsible trampolines. In order to use such a trampoline for gymnastic exercises, the frame is unfolded, so that at this the hammock is stretched and ready to perform the gymnastic exercises. If the trampoline is no longer needed, it is folded up and stored on two lifting roller stands. The lifting roller stands are mechanically fixed on opposite sides of the trampoline to this with adapters. The folded components of the trampoline are oriented substantially in a vertical plane. The height of the trampoline can be raised or lowered by means of the lifting roller stands. Since the Heberollständer have rollers on their undersides, if necessary, the unit of folded trampoline and the storage forming Heberollständern can be moved.

Such systems are manufactured by Eurotramp. The lifting roller stand consists essentially of a stator part, comprising a first, extending in the horizontal direction metallic support, at the longitudinal ends of each a roller is mounted and a fixed to the upper side, extending in the vertical direction second metallic tubular support. On this support a lever is attached by means of a hinge, wherein the joint divides the lever into two lever arms. At the end of the longer first lever arm, a handle for actuating the lever is provided by an operator. At the end of the second lever arm is an adapter for attaching the lever to the trampoline. The adapter is in the form of a cylindrical tube piece which can be inserted into a hollow cylindrical receptacle on the trampoline. Once the adapter is inserted into the receptacle, the trampoline can be raised or lowered by pivoting the lever. In a lower and upper limit position while the lever can be secured in position by a securing bolt on the vertical support. An advantage of this Heberollständer is that this has a very robust design and its operation is easy to carry out even by unskilled personnel. The disadvantage, however, is that for the operator, the actuation of the lever when lifting the trampoline with an undesirably high amount of force is connected, since the pressing takes place against the entire weight of the trampoline. Conversely, a lowering of the trampoline by means of the lever is associated with dangers, since then the entire weight of the trampoline rests on the lever. If this is suddenly released by the operator, the lever moves up unchecked. To secure against such uncontrolled movements of the safety pin, which must first be solved manually, or the lever can be pivoted from a limit position. According to the safety instructions attached to the lift stand, the operator has to operate the safety bolt with one hand and the handle of the lever with the other hand. However, if operators ignore existing safety precautions, the operator may insert one hand between the vertical brackets and the second lever arm as the lever pivots. If then the lever is moved too fast, it can cause injury to the operator by trapping the hand. The invention has for its object to provide a lifting jack stand of the type mentioned for trampolines, which can be operated with high safety standard easy and with little effort.

To solve this problem, the features of claim 1 are provided. Advantageous embodiments and expedient developments of the invention are described in the subclaims.

The lifting stand for a trampoline according to the invention comprises a stand part mounted on rollers with a guide. In the guide a fixable on the trampoline guide element is arranged height adjustable. The guide has an adapter for fixing on the trampoline and an actuating element for height adjustment of the guide element. As a means for height adjustment, a hydraulic unit is provided. The actuator for actuating the hydraulic unit is a pedal.

A significant advantage of the lifting roller stand according to the invention consists in the fact that the infeed and extension of the guide element in the guide and thus the implementation of the height adjustment of the lifting roller stand can also be performed easily and quickly by inexperienced persons and even children. It is particularly advantageous that there is no security risk in the foot operation of the foot lever. In particular, there is no risk of pinching the limbs of the respective operator in the operation of the foot pedal. Since thus risk of injury to the operator can be excluded with high security in the operation of the pedal, the lifting tool according to the invention meets a very high safety standard. Another significant advantage of the invention is that lifting and lowering of a trampoline can be performed with little effort by the built-in Heberollständer hydraulic unit. Another advantage of the hydraulic unit used is that with this not only a simple retraction and extension of the guide element in the guide for carrying out the height adjustment is guaranteed. Rather, it is achieved alone with the hydraulic unit, without the use of further mechanical latching means that a set height position of the guide element is securely held in the guide.

Finally, it is advantageous that the hydraulic unit has damping properties.

This prevents uncontrolled, rapid downward movement of the lifting roller stand in case of improper operation of the actuating element, whereby the risk of injury to the operating personnel in handling the lifting roller stand is further reduced.

To store a trampoline, two lifting racks are required, which are attached to opposite sides of the trampoline. The lifting stand is designed in such a way that it can be optionally attached to one of the sides of the trampoline. Thus, only one design of the lifting roller stand for the storage of a trampoline is needed. Due to the height adjustability of the lifting roller stand, the trampoline can be stored at different heights on the lifting roller stands. Advantageously, a lower sole position is dimensioned so that the total height of the trampoline mounted on the height of the lifting columns is smaller than the heights of doors in buildings, so that the trampoline can be pushed past the height of the lifting columns through such door openings.

The invention will be explained below with reference to the drawings. Show it:

Figure 1: Top view of a folded trampoline mounted on two Heberollständer. FIG. 2: individual representation of a lifting roller stand.

Figure 3: Structure of a hydraulic unit for the lifting jack stand according to

FIG. 2.

FIG. 1 shows a top view of a folded trampoline 1, which is mounted on two lifting roller stands 2. The trampoline 1 has a hinged frame, so that it can be folded after use, as shown in Figure 1, so that the components of the trampoline 1 are oriented in a substantially vertical plane. In this case, the trampoline 1 is supported on opposite sides, in each case on a lifting roll stand 2, wherein these are formed identically. The Heberollständer 2 form a height-adjustable, mobile storage for the trampoline. 1

FIG. 2 shows an individual representation of a lifting roller stand 2.

The lifting roll stand 2 has a post part, which has a metallic, tubular support 3 running in the horizontal direction. At the longitudinal ends of the carrier 3, a roller 5 is mounted in each case by means of a rotary bearing 4. The rollers 5 rest on a support. By these rollers 5, the Heberollständer 2 is movably mounted on the support. As a further part of the Ständerils a firmly connected to the carrier 3, a guide forming metallic outer tube 6 is provided. The outer tube 6 is seated in the center of the carrier 3 on its upper side. The longitudinal axis of the outer tube 6 extends in the vertical direction. The outer tube 6 has an oval, in particular elliptical cross-section and is open at its top.

In the outer tube 6, a guide element is slidably mounted. The guide element consists of an inner tube 7, which also has an oval, preferably elliptical cross-section. The outer dimensions of the guide element are adapted to the inner diameter of the guide so that the guide element is guided with little play in the guide. The upper Part of the guide tube forming inner tube 7 protrudes beyond the top of the outer tube 6 forming the guide. Since the outer tube 6 and the inner tube 7 have a non-rotationally symmetrical, oval cross-section, the inner tube 7 is mounted against rotation in the outer tube 6, that is, it can not be rotated in the outer tube 6, but only moved in the vertical direction.

At the upper edge of the guide member is an adapter 8 for fixing the trampoline 1. The adapter 8 consists of a circular cylindrical metal part whose longitudinal axis extends in the horizontal direction, and which protrudes perpendicularly from a side surface of the tube 7. For coupling the lifting roller stand 2 to the trampoline 1, this adapter 8 is inserted into a hollow-cylindrical receptacle on the trampoline 1.

As can be seen from FIG. 1, a first retaining clip 9 is hinged to the upper side of the inner tube 7. At the bottom of the outer tube 6, a second bracket 10 is hinged. With these brackets 9, 10, the folded trampoline 1 is secured in position, that is secured against unwanted unfolding.

For actuating the lifting roller stand 2, that is, for the height adjustment, an actuating element in the form of a foot pedal i I is provided. The foot lever 11 is pivotally mounted in the lower region of the outer tube 6, so that an operator can operate the foot lever 11 comfortably with one foot.

Figure 1 shows the pedal 11 in a parking position in which it is folded up and tight against the outer tube 6 of the lifting roller stand 2. Figure 2 shows the pedal 11 in different pivot positions. By pivoting the foot lever 11, a hydraulic unit 12 is actuated within the lifting roller stand 1. By the hydraulic unit, the inner tube 7 is moved out of the outer tube 6 and retracted into this. In addition, only by the hydraulic unit 12, the inner tube 7 is held securely in a set with the pedal lever 11 height position there.

In Figure 2, the parking position of the foot lever 11, in which it rests tightly against the outer tube 6, denoted by I.

In order to perform a height adjustment, the foot lever 11 is folded manually or with the foot from the parking position I to the basic position designated II. This folding movement can be exercised without a resistance acting through the hydraulic unit 12.

In order to drive the inner tube 7 out of the outer tube 6, the hydraulic unit 12 is actuated in that the pedal 11 is repeatedly moved back and forth between the basic position II and an end position III by the operator pressing the foot lever 11 several times with his foot , The pump stroke between the basic position II and the end position III is marked with the double arrow marked P. If the operator has extended the inner tube 7 to the desired position, it folds the foot lever 11 back into the parking position. Then, the inner tube 7 is held securely alone by the hydraulic unit 12 in its desired position. However, if the operator wishes to retract the inner tube 7 into the outer tube 6, the foot lever 11 is pivoted with the foot beyond a resilient pressure point beyond the end position III into a lowered position IV. If the inner tube 7 retracted into the desired position in the outer tube 6, the pedal 11 is folded back into the parking position I back.

FIG. 3 shows the structure of the hydraulic unit 12 for the lifting roll stand 2 according to FIGS. 1 and 2. The hydraulic unit 12 has a piston rod 13, which can be retracted and extended from a pressure pipe 14. At the upper end the piston rod 13 is a first attachment eye 15, to which the inner tube 7 is coupled. The lower end of the pressure tube 14 is mounted in a pipe section 16. At the lower end of the pipe section 16 is a second fastening eye 17 for coupling to the outer tube 6. The foot lever 11 is mounted at a bearing point 18 on a tab 19 in the region of the pipe section 16. At the front end of the foot lever 11 is a roller tappet 20, which adjoins the lower end of a pump rod 21 which is mounted in a guide bush 24 in the longitudinal direction displaceable. The upper end of the pump rod 21 protrudes into a pump oil chamber 22. The pump rod 21 is associated with a return spring 23 mounted between two stops.

To guide the piston rod 13, a guide bushing 24 and a guide piston 25 are provided. The guide piston 25 is guided in an inner cylinder 26. In this, a slider 27 is slidably mounted against the restoring force of a spring 28 located on a stop 28. The space between the inner cylinder 26 and pressure tube 14 forms an oil compensation chamber 30. A cavity in the interior of the inner cylinder forms an oil-pressure chamber 31st

The operation of the hydraulic unit 12 is such that when the foot lever 11 is actuated between the basic position II and the end position III, pressure is exerted on oil accumulated in the pump oil chamber 22, since the pump rod 21 is pressed into the pump oil chamber 22 via the roller tappet 20.

By this pressure, which can be reduced only via a discharge of oil through a non-illustrated check valve from the pump oil chamber 22 into the oil pressure chamber 31, the piston rod 13 is extended upward and thus the inner tube 7 from the outer tube 6. When quitting the pumping operation by means of the foot lever 11, that is, when relieving the foot lever 11, the pump rod 21 is returned by the return spring 23 to its original position. It is about a not shown Check valve Oil sucked from the oil compensation chamber, so that the pumping oil chamber 22 is again filled with the extended pump rod volume with oil.

Thus, the position of the piston rod 13 is maintained stable, that is, the piston rod 13 is fixed due to the oil pressure rigidly in its desired position. Furthermore, the pumping process can now be repeated or continued at any time.

If the piston rod 13 is fully extended up to its upper stroke end, upon further actuation of the foot lever 11, the excess oil delivered by the further pumping is conducted via a bypass into the oil compensation chamber 30.

To lower the inner tube 7 and the piston rod 13 of the pedal 11 is pivoted over a resilient pressure point away in the lowered position IV. As a result, the pump rod 21 presses on the slider 27. This opens a passage so that oil from the oil pressure chamber 31 can flow into the oil compensation chamber 30. Thus, the piston rod 13 can be pushed down, that is, the inner tube 7 moves into the outer tube 6 when a load acts on this.

LIST OF REFERENCE NUMBERS

O) trampoline

(2) Lifting stand

(3) carrier

(4) pivot bearing

(5) role

(6) outer tube

(7) Inner tube

(8) Adapters

(9) Headband

(10) headband

(H) foot pedal

(12) Hydraulic unit

(13) Piston rod

(14) Pressure tube

(15) fixing rod

(16) Pipe piece

(17) Fixing eye

(18) bearing point

(19) tab

(20) Roller tappets

(21) Pump rod

(22) Pump oil room

(23) return spring

(24) guide bush (25) Guide piston

(26) Inner cylinder

(27) slider

(28) stop

(29) Spring

(30) Oil equalization room

(31) Oil pressure chamber

Claims

claims

1. lifting roll stand for a trampoline with a roller mounted on the stand part, which comprises a guide in which a trampoline fx-adjustable guide element is height adjustable, which has an adapter for fixing to the trampoline, and with an actuating element for height adjustment of the guide element, characterized in that a hydraulic unit (12) is provided as means for height adjustment, and in that the actuating element for actuating the hydraulic unit (12) is a foot lever (11).

2. Lift stand according to claim 1, characterized in that the foot lever (1 1) is pivotally mounted on this.

3. lifting roll stand according to claim 2, characterized in that by pivoting the foot lever (11) to a resilient pressure point towards the guide element is extendable from the guide.

4. Lift stand according to claim 3, characterized in that the guide element is held in an extended position solely by the hydraulic unit (12).

5. Lifting stand according to one of claims 3 or 4, characterized in that by pivoting the foot lever (11) over the resilient

Pressure point beyond the guide element is retractable into the guide.

6. Lifting stand according to one of claims 2 to 5, characterized in that the foot lever (11) can be introduced into a parking position.

7. Lifting stand according to one of claims 1 to 6, characterized in that the guide is formed by an outer tube (6), in which a guide element forming the inner tube (7) is guided against rotation.

8. Lifting stand according to claim 7, characterized in that the longitudinal axes of the outer tube (6) and the inner tube (7) extend along an axis extending in the vertical direction.

9. lifting roll stand according to one of claims 1 to 8, characterized in that the adapter (8) has a circular cylindrical shape and opens at the upper end of the guide member, and that the adapter (8) in a hollow cylindrical receptacle on the trampoline (1) can be inserted ,

10. Lift stand according to one of claims 1 to 9, characterized marked, that on the guide element and the guide in each case a sling bar for fixing the position of the trampoline (1) is provided.

11. Lifting roll stand according to one of claims 1 to 10, characterized by its multiple arrangement, wherein two lifting roll stands (2) on opposite sides of a trampoline (1) are fixable.