JPH0113146Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a movable and foldable stage having casters.

Conventionally, folding stages have been known in which when the stage plate is unfolded, the casters do not touch the ground, and only the lifting legs touch the ground, and when the stage plate is folded, the lifting legs do not touch the ground, and only the casters touch the ground. It is being In all conventional products, the caster is attached to an elongated connecting member such as an angle, and a pair of these elongated connecting members are arranged parallel to each other at intervals, and the end of each elongated connecting member is fixed to the elevating member. There is. For example, as shown by the two-dot chain line in FIG. 3, elongated connecting members y, y are stretched and fixed on a virtual straight line m that connects the front and rear lifting cylinders 4, 4. However, the caster is attached to the mounting shaft 1a.
Since it rotates 360 degrees horizontally around , when the casters rotate inward and come to the dotted line position indicated by x, there is only an extremely small distance l ₁ between the casters. For this reason, when the stage plate is folded, it is unstable, and there is a risk that the entire stage plate may topple over, resulting in death or injury.

This invention solves the above-mentioned disadvantages, namely, the pair of left and right elevator cylinders 4, 4 standing vertically are replaced by two.
These elevator tubes 4, 4, 4, 4 are arranged one set each at the front and rear of the center, and the left and right elevator tubes 4, 4 are connected with a horizontal connecting rod 8 at intervals, and are arranged at intervals. A pair of supporting arms 9, 9 are integrally provided upwardly projecting from each connecting rod 8, and a horizontal elongated connecting member 11 is stretched and fixed under each of the front and rear elevator cylinders 4, 4. Attach the casters 1 and 1 to the connecting member 11 at intervals, and vertically pass through the elevating support leg 3 to each elevating tube 4, and install a spring support 17 made of a plate material with a smooth upper surface horizontally to the upper end of each elevating support leg 3. and each lifting support leg 3
Wrap the coil springs 5 above each coil spring 5.
The upper end is provided on the lower surface of the spring holder 17, the lower end of each coil spring 5 is provided on the upper end of the lifting cylinder 4, and the inner lower surface of the pair of stage plates 2, 2 is rotatable to the upper end of each support arm 9. A push pin 14 with a convex arc surface formed at the lower end is provided vertically protruding from the bottom surface of each stage plate 2 at a position corresponding to each spring receiver 17, and the lower end of each push pin 14 is attached to each spring receiver. In a folding stage in which the upper ends of a pair of outer supporting legs 7, 7 placed on the upper surface of the tool 17 and arranged at intervals are rotatably attached to the outer lower surface of each stage plate 2, the front and rear elevating tubes 4 , 4, and the elevator tube mounting portion 11 is located inside the caster mounting portion 11a.
b, 11b to form each elongated connecting member 11.

Hereinafter, the structure of this invention will be described in detail based on the embodiments shown in the accompanying drawings. A pair of stage plates 2, 2 are made from thick plates, a hinge 12 is provided on the inside of the back surface of each stage plate 2, and a push pin 14 is vertically protruded slightly diagonally rearward of the hinge 12. The lower end of the push pin 14 is formed into a hemispherical or semicircular plate, or a ball bearing or a roller bearing is attached to the lower end, that is, a convex arc surface is formed at the lower end of the push pin 14, and around the back surface of each stage plate 2. Attach the angle 6 and cut the inward end surfaces of each stage plate 2 and angle 6 outward at an angle of about 45 degrees as you go downward, as shown in Fig. 2, and attach each stage plate 2 to the front and rear support structures A, A. , supported by lifting support legs 3, 3 and outer support legs 7, 7 made of metal pipes. The support structure A includes a pair of left and right elevator tubes 4 that stand vertically,
4 are arranged at a distance l and are connected by horizontal upper and lower connecting rods 8, 8', and a pair of support arms 9, 9 whose upper ends are bent inward are placed near both ends of the upper connecting rod 8 at a distance. A bowl-shaped receiver 10 is formed at the upper end of each elevator tube 4, and a horizontal angle connecting the elevator tube 4 of the other support structure A to the lower part of each elevator tube 4 is provided. The end portions of the elongated connecting members 11 are fixed, and each elongated connecting member 11 has elevating tube mounting portions 11b, 11b extending diagonally to the side as shown in the third figure.
and a caster attachment part 11a connected to these, and this caster attachment part 11a is located outside the imaginary straight line m connecting the front and rear elevator cylinders 4, 4,
Caster mounting portion 11a of the other elongated connecting member 11
A pair of casters 1, 1 arranged parallel to the
The caster 1 is mounted so as to be horizontally rotatable with a mounting shaft 1a, and each caster 1 is equipped with a stopper (not shown) operated by a lever 1b.
The inner lower surface of the stage plate 2 is rotatably attached to the upper end of each support arm 9 via a hinge 12 and a pin 13. In addition, as shown in the 2nd and 6th figures, each elevator tube 4
A spring holder 17 having a flat upper surface and made of a disc material is horizontally fixed to the upper end of the lifting support leg 3 vertically, and a coil spring 5 is wound above the lifting support leg 3. , the upper end of the coil spring 5 is locked to the spring holder 17 and the lower end to the holder 10, and the lower end of the push pin 14 is brought into contact with the spring holder 17. Furthermore, the upper ends of the pair of outer supporting legs 7, 7 arranged at intervals are connected to the lower surface of each stage plate 2,
Moreover, it is attached rotatably to the outside of each lifting support leg 3,
Each end of the brace 18 is rotatably attached to the lower connecting rod 8' and the outer support leg 7.

Next, the operation of the stages of this invention will be explained.

When the stage plates 2, 2 are folded, the first,
As shown in Figure 4, the outer ends of the stage plates 2, 2 are in contact with each other, each coil spring 5 is extended, the lifting support leg 3 is pulled up, and the push pin 14 engages the spring receiver 17 at its side. The upper limit position of the lifting support leg 3 is determined by stopping, and only the caster 1 is in contact with the ground. If you grab the outer end of one stage plate 2 here and rotate it downward, the stage plate 2 will rotate around the pin 13, and the lower end of the push pin 14 will slide on the surface of the spring holder 17. , the spring holder 17 is pushed down vertically, and as a result, the elevating support leg 3 integrated with the spring holder 17 descends vertically, the coil spring 5 begins to contract, and eventually the elevating support leg 3 and the caster 1 are pushed down as shown in FIG. Both are grounded. Subsequently, when the stage plate 2 is further lowered, the lifting support legs 3 are in contact with the ground, so the supporting arms 9, the connecting rods 8, 8', the lifting tube 4, and the caster 1 are pulled up vertically, and the coil springs 5
shrinks further. Further, the stage plate 2 rotates around the rising pin 13 and unfolds horizontally as shown in FIGS. 2 and 6. Similarly, the other stage plate 2 is expanded. During this development, no gap is created between the inner ends of the stage plates 2, 2, as shown in FIG. In addition, in the process of moving from the folded state to the halfway state and then to the unfolded state, each outer support leg 7 is rotatably attached to the stage plate 2 at its upper end and to the brace 18 at the middle, It is deployed and grounded as shown in Figure 2.

Next, in order to fold the stage plate 2, it is sufficient to perform the operation opposite to the above. When the outer end of the stage plate 2 is lifted, the inner end surfaces of the stage plates 2, 2 will try to abut each other, but as shown in FIG. As shown in the figure, since the inner end surface is cut out, one inner end rotates smoothly while thrusting into the cut part of the other, and the push pin 14 tilts while sliding on the spring holder 17, and the coil spring 5 extends, the elevating cylinder 4, caster 1, support arm 9, and pin 13 descend vertically, and the stage plate 2 rotates upward around the descending pin 13. Halfway through, the caster 1 touches the ground, and when the stage plate 2 is further lifted, the elevating support leg 3 is pulled up vertically by the expanding coil spring 5. From this point on, the stage plate 2 rotates around the stopped pin 13. Then, it finally stands up completely and folds up. At this time, as shown in FIG. 4, the spring receiver 17 is engaged with the side of the push pin 14, and the elevating support leg 3 stops without rising any further. Similarly, the other stage plate 2 is also folded. In addition, when folding the stage plate 2, it is better to apply a stopper to each caster 1 using the lever 1b for better stability.

In this way, this idea is based on the left and right sides standing vertically.
Two pairs of elevator tubes are provided, one set each at the front and rear of the center, and the left and right elevator tubes are connected with a horizontal connecting rod at an interval, and a pair of supports placed at an interval are provided. An arm is integrally protruded upward from each connecting rod, and a horizontal long and narrow connecting member is stretched and fixed under each of the front and rear elevator cylinders, and a pair of casters are attached to each long and narrow connecting member at intervals. In addition, a spring holder made of a plate material with a smooth upper surface is fixed horizontally to the upper end of each lifting support leg, and a coil spring is wound above each lifting support leg. The upper end is provided on the lower surface of the spring receiver, the lower end of each coil spring is provided on the upper end of the elevator cylinder, and the inner lower surface of the pair of stage plates is rotatably attached to the upper end of each support arm.
A push pin with a convex arc surface on the lower end is provided vertically protruding from the bottom surface of each stage plate at a position corresponding to each spring holder, and the lower end of each push pin is placed on the top surface of each spring holder, and the space Since the upper ends of the pair of outer supporting legs arranged at the same distance are rotatably attached to the outer lower surface of each stage plate, due to the above action, when the stage plate is deployed, only the elevating supporting legs touch the ground without the casters touching the ground. Of course, when folded, only the casters can touch the ground without the lifting legs touching the ground.Also, a plate with a smooth top surface is inserted vertically through the lifting legs into each lifting tube, and is attached to the upper end of each lifting support leg. A spring holder consisting of the Moreover, since push pins protruding perpendicularly to the positions corresponding to each spring holder are placed on the top surface of the spring holder, there is no need to manually pull up the lifting support legs when folding the stage board, and the process is automatically carried out by the coil springs. , it is easy to operate, and the push pin is always in contact with the top surface of the spring holder, allowing the stage plate to open and close quietly and smoothly. When folded, the push pin locks the spring holder, and there is no risk of the lifting support leg suddenly popping out and injuring the user or those around them, so it can be handled safely.

In particular, this invention forms each elongated connecting member with a caster mounting portion located outside the imaginary straight line connecting the front and rear elevator shafts, and an elevator shaft mounting portion located inside the caster mounting portion. When the product's casters rotate and are positioned inward, the distance is extremely small, but it can maintain a large distance l ₃ as shown in Figure 3 at all times, and even when the casters are facing inward, it maintains a larger distance l ₂ than conventional products. It has very good stability and there is no risk of it falling over and causing an accident.

Note that if the inner end surface of each stage plate is cut outward toward the bottom, the inner end surface of one stage plate will not collide with the inner end surface of the other stage plate during the opening/closing operation of the stage plate.

[Brief explanation of the drawing]

The figures show the foldable stage of this invention. Figure 1 is a front view of the folded state, Figure 2 is a front view of the folded stage, and
The figure is a front view of the unfolded state, FIG. 3 is a partially cutaway plan view of the same as above, and FIGS. 4 to 6 are operation explanatory diagrams in which main parts are enlarged. 1...caster, 2...stage board, 3...
Lifting support leg, 4... Lifting tube, 5... Coil spring, 7
...Outer support leg, 8...Connection rod, 9...Support arm, 11
...Slender connecting member, 11a...Caster mounting part,
11b...Elevating cylinder mounting part, 14...Push pin, 1
7...Spring holder, m...Virtual straight line.

Claims (1)

[Scope of utility model registration request] Two pairs of left and right elevator tubes 4, 4 standing vertically are provided, one set each of these elevator tubes 4, 4, 4, 4 are arranged in front and behind the center, and each left and right elevator tubes 4, 4 are connected horizontally. A pair of supporting arms 9, 9 connected at intervals by a rod 8 and arranged at intervals are integrally provided upwardly from each connecting rod 8, and extend below each of the front and rear elevator cylinders 4, 4. Horizontal elongated connecting members 11 are stretched and fixed, casters 1, 1 are attached to each elongated connecting member 11 at intervals, and the elevating support legs 3 are vertically penetrated to each elevating cylinder 4, and a plate member with a smooth upper surface is installed. A spring holder 17 consisting of
Wrap the coil spring 5 above the coil spring 5.
The upper end is provided on the lower surface of the spring holder 17, the lower end of each coil spring 5 is provided on the upper end of the lifting cylinder 4, and the inner lower surface of the pair of stage plates 2, 2 is rotatable to the upper end of each support arm 9. A push pin 14 with a convex arc surface formed at the lower end is provided vertically protruding from the bottom surface of each stage plate 2 at a position corresponding to each spring receiver 17, and the lower end of each push pin 14 is attached to each spring receiver. In a folding stage in which the upper ends of a pair of outer supporting legs 7, 7 placed on the upper surface of the tool 17 and arranged at intervals are rotatably attached to the outer lower surface of each stage plate 2, the front and rear elevating tubes 4 , 4, and the elevator tube mounting portion 11 is located inside the caster mounting portion 11a.
b, 11b to form each elongated connecting member 11.