JPS5923164Y2 - foldable stage - Google Patents

Description

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

Conventionally, when the stage plate is unfolded, the casters do not touch the ground, and only the elevating legs touch the ground.When the stage plate is folded, the elevating legs do not touch the ground, only the casters touch the ground, and when the stage plate is unfolded, the stage A folding stage is known in which there is almost no gap between the inner edges of the stage plates and the inner edges of the stage plates do not collide with each other when folded.

Specifically, it is shown in FIGS. 7 to 10, and this conventional product has the following configuration in order to achieve the above effects.

In other words, a pair of left and right lifting legs a, a are arranged in front and back of the center, and each lifting leg a, a is integrated with a connecting rod slightly above, and when this connecting rod is connected, a pair of stage plates e,
Bracket k fixed inward of e.

k are pivotally connected by the first link C and the L-shaped second link d, the stage plates e and e are rotatable, and the casters f and f are connected as shown in Fig. 9. Two-pronged brackets (j, j) connected to the elevator tubes g, g via horizontal frame members, each elevator tube g extrapolated to each elevator support leg a, and fixed to the inside of each stage plate e. The frame members are pivotally connected to each other by diagonally extending support links i, i.

For this reason, the stage plates e and e in the unfolded state shown in FIG.
When folded down, the lift tube g9g descends vertically while receiving diagonal force from the support links i, i through the horizontal members, and here the casters f, f and the lift legs a,
When both stage plates a and a are in contact with the ground, and stage plates e and e are further folded, elevating support legs a and a will connect to connecting rod b and the first
, stage plates e, e via second links c, d
Since the stage plates e and e are connected to each other, they are manually pulled up together with the stage plates e and e, and eventually, as shown in Figures 8 and 9, the stage plates e and e are completely folded, and only the casters f and f are in contact with the ground. .

It should be noted that the stage plates e and e are developed by the operation opposite to the above.

Also, with this conventional product, the first and second links c,
d is their pivot pol) l, m axis is dotted chain line x,
It is arranged to take a rotating trajectory drawing an arc of y, and when the stage plate e rotates upward toward the non-operating position where it is folded, its inner end e' is indicated by the dashed line 2 in FIG. It is designed to move along an S-shaped trajectory.

In other words, by arranging the first and second links c, d, and bracket k in the positions and shapes shown in the figure, one stage plate e can be folded away from the other stage plate e during the initial rotational movement during folding. It seems like it's going down.

On the other hand, stage board e. As the stage plate e is expanded, the pivot pole l, m, and the inner end e' of the stage plate e operate in the opposite manner to the above, and as shown in Figures 7 and 10, there is almost no gap between the inner ends e' and e'. It is something that comes close.

Although the conventional product achieves the above-mentioned effects in this way, it has the following drawbacks.

In other words, first, move the first link C1 and the second link d forward and backward.
Since a so-called multiple link mechanism is frequently used, in which four support links are used, two on each side, and two on the left and right sides, high precision, heavy equipment, and a strong structure (reinforcement) are required. It is an expensive product, has many worn parts, and requires a large number of repair parts, making it uneconomical.

In other words, in order for the link mechanism to operate without any problems, it is necessary to assemble it firmly so that the structure of the main body is not distorted, and accurately so that there is no deviation in the pivot position. It is difficult and requires skill, making it an expensive product, and there are many parts that wear out.
The number of repair parts increases, making it uneconomical.

Second, when folding the large and heavy stage plates e and e, the elevating support legs a and a must be manually pulled up as mentioned above, which requires a great deal of effort and is cumbersome to operate. .

Thirdly, when the stage plates e and e are folded and unfolded, the long diagonal support links i and i diagonally extend the horizontal members h,
Lifting tubes g, g, casters f, f must be pulled down or pulled up vertically, which applies unnecessary force in the direction, causes mechanical friction and loss of power, increases the number of parts failures, and often It requires lubricant.

This idea was created by focusing on the above-mentioned drawbacks of the conventional technology.When the stage plate is unfolded, the casters do not touch the ground, and only the lifting legs touch the ground.When the stage plate is folded, the lifting legs touch the ground. Although it is a folding stage, only the casters are in contact with the ground, and there is no gap between the inner edges of the stage plate when unfolded, and the inner edges of the stage plates do not collide with each other when folded.Although it is a foldable stage, the overall structure Our first goal is to provide a foldable stage that does not require high precision, is lightweight, can be manufactured at low cost, and is easy to maintain.
A second purpose is to provide a foldable stage that is easy to operate and does not require the extra effort of manually pulling up the lifting support legs when folding the stage plate. A third purpose is to provide a folding stage that eliminates the wasted force and mechanical friction of moving casters vertically up and down by force from an oblique direction, has fewer failures, and does not often require lubricant. It is something.

In order to achieve these objectives, this invention provides two pairs of left and right elevator tubes 4, 4 that stand vertically, and these elevator tubes 4.
．． 4. 4. 4 are arranged in pairs at the front and rear of the center, and the left and right lift tubes 4, 4 are connected at intervals by horizontal connecting rods 8, and a pair of support arms 9, 9 are connected at intervals from near both ends of each connecting rod 8. Each end of a horizontal slender connecting member 11 is integrally provided to protrude upward and is fixed below each of the front and rear lifting cylinders 4, 4 and to the inward side surface, and casters 1,
1 at intervals, and also attach the lifting support legs 3 to each lifting cylinder 4.
A spring holder 1 made of a plate material with a smooth upper surface and passing vertically through the
7 horizontally to the upper end of each lifting support leg 3.
A coil spring 5 is wound upward, the upper end of each coil spring 5 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 elevator cylinder 4, and a pair of stage plates 2, 2 are provided.
The inner lower surface of is rotatably attached to the upper end of each support arm 9, and a push pin 14 with a convex arc surface formed on the lower end is mounted vertically on the lower surface of each stage plate 2 at a position corresponding to each spring holder 17. The lower ends of each push pin 14 are placed on the upper surface of each spring holder 17, and the upper ends of outer support legs 7, 7 are rotatably attached at intervals to the outer lower surface of each stage plate 2. This configuration is characterized in that the inner end surface of the plate 2 is cut outward as it goes downward, and the upper edges of the inner ends of the pair of stage plates 2, 2 are brought into line contact.

Hereinafter, the structure of this invention will be described in detail based on the embodiments shown in FIGS. 1 to 6 of the accompanying drawings.

A pair of stage plates 2, 2 are made from thick plates, and a hinge 12 is provided on the inside of the back surface of each stage plate 2.
A push pin 14 is vertically protruded slightly diagonally rearward, and the lower end of the push pin 14 is formed into a hemispherical or semicircular plate, or a ball bearing or roller bearing is attached to the lower end, that is, the lower end of the push pin 14 is Forming a convex arc surface, angles 6 are attached around the back surface of each stage plate 2, and as shown in FIG. While cutting, a pair of stage plates 2, as shown in Fig. 2.3, are cut.
Each stage plate 2 is supported by the front and rear support structures A, A, the lifting support legs 3.3 made of metal pipes, and the outer support legs 7, 7, with the upper edges of the inner ends of the stage plates 2 in line contact.

The support structure A includes l pairs of left and right elevator tubes 4 that stand vertically,
4 are connected with a spacing between horizontal upper and lower connecting rods 8, 8',
1 with the upper end bent inward from near both ends of the upper connecting rod 8
A pair of support arms 9, 9 are integrally provided with a gap between them, and a bowl-shaped support 10 is formed at the upper end of each elevator tube 4, and the other is supported below each elevator tube 4 and on the inward side surface. The ends of an elongated connecting member 11 such as a horizontal angle that connects the elevating cylinder 4 of the structure A are fixed, and the casters 1, 1 are attached to this elongated connecting member 11.
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.

Further, as shown in the second and sixth figures, the lifting support leg 3 is vertically penetrated into each lifting tube 4, and the upper end Rohe nut 15 of the lifting support leg 3 is embedded and fixed, and the upper surface is flat and a spring holder 17 made of a disc material. is fixed horizontally to the upper end of the lifting support leg 3 via a threaded rod 16 and a nut 15. In other words, the spring holder 17 and the threaded rod 16 form a large bolt, and this threaded rod 16 is screwed into the nut 15 to attach the spring. The support 17 is horizontally fixed to the upper end of the lifting support leg 3, the coil spring 5 is wound above the lifting support leg 3, the upper end of the coil spring 5 is fixed to the spring support 17, the lower end is fixed to the support 10, and the above spring is fixed. The lower end of the push pin 14 is brought into contact with the receiver 17.

Furthermore, the upper ends of the outer support legs 7 are rotatably attached at intervals on the lower surface of the stage plate 2 and to the outside of each lifting support leg 3, and each end of the brace 18 is connected to the lower connecting rod 8' and the outer support leg 7. It is installed so that it can rotate freely.

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

When the stage plates 2, 2 are folded, the outer ends of the stage plates 2, 2 are in contact with each other, as shown in FIG. 14 locks a spring holder 17 on its side to determine the upper limit position of the lifting support leg 3, 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 support 17 is pushed down vertically, and as a result, the lifting support leg 3 integrated with the spring support 17 is vertically lowered, the coil spring 5 begins to contract, and eventually the lifting 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, since the elevating support legs 3 are in contact with the ground, the supporting arms 9, connecting rods 8, 8', elevating tube 4, and casters 1 are pulled up vertically, and the coil springs 5 are further contracted.

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, as shown in FIG. 2, the upper edges of the inner ends of the stage plates 2 and 2 are in line contact, so that no gap is created.

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, if the inner end surfaces of the stage plates 2 and 2 are perpendicular, the inner end surfaces will collide with each other. However, since the inner end surface is cut out as shown in FIG. The stage plate 2 tilts while sliding, the coil spring 5 extends, the elevator tube 4, caster 1, support arm 9, and pin 13 descend vertically, and the stage plate 2 rotates upward around the descending pin 13. go.

The casters 1 touch the ground midway, and when the stage plate 2 is further lifted, the coil springs 5 extend, causing the lifting support legs 3 to
is pulled up vertically, and from this point on, the stopped pin 1
The stage plate 2 rotates around 3, and eventually 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.

Note that by screwing the threaded rod 16, the elasticity of the coil spring 5 can be effectively adjusted, and if the lifting support leg 3 has uneven ground surfaces, by screwing the screw rod 16 to move it up and down, By adjusting the length of the elevating support legs 3, the stage plate 2 can always be supported horizontally.

In this way, this idea provides two pairs of left and right elevator tubes that stand up vertically, one pair of these elevator tubes are placed in front and behind the center, and the left and right elevator tubes are connected at intervals using horizontal connecting rods. A pair of supporting arms are integrally provided upwardly from near both ends of each connecting rod at intervals, and each end of a horizontal slender connecting member is fixed to the inward side surface below each of the front and rear elevator tubes. , Attach pairs of casters at intervals to the front and back of each elongated connecting member, and vertically pass through the elevating support legs to each elevating tube, and fix horizontally to the upper end of each elevating support leg a spring holder made of a plate with a smooth top surface. Then, a coil spring is wound above each elevating support leg, the upper end of each coil spring is provided on the lower surface of the spring holder, the lower end of each coil spring is provided as the upper end of the elevating cylinder, and the inner lower surface of a pair of stage plates is provided. A push pin that is rotatably attached to the upper end of each support arm and has a convex arc surface on the lower end is provided on the lower surface of each stage plate and protrudes vertically to a position corresponding to each spring holder. The lower end is placed on the upper surface of each spring holder, and the upper end of the outer support leg is rotatably attached to the outer lower surface of each stage plate at intervals, so when the stage plate is unfolded, due to the above action, the casters can be raised and lowered without touching the ground. It goes without saying that only the supporting legs touch the ground, and when folded, only the casters can touch the ground without the elevating supporting legs touching the ground, just as in the conventional example.Moreover, in order to achieve the same effect, multiple links are used as in the conventional example. It does not require heavy use of mechanisms,
In other words, the support arm, which is rotatably attached to the inner lower surface of the stage plate, is not pivotally connected to the connecting rod, but is integrally provided upwardly protruding, and the elevating support leg and the stage plate are connected to the upper surface of the stage plate. A push pin with a convex arc surface is placed on the lower end of a spring holder cut out of a smooth plate to make contact.In other words, the two members are provided in a non-coupled manner, and the caster has a support link to the stage plate. It is connected to the stage plate through a slender connecting member, an elevator cylinder, and a support arm, and unlike multiple link mechanisms that often use multiple link mechanisms, it does not need to be made with great precision, and the stage plate can be easily attached to the stage plate. The device operates without any problem even if some distortion occurs in the device, and as a result, it can be manufactured easily, lightweight, and inexpensively, has few worn parts, and is easy to maintain.

In addition, this idea vertically penetrates the elevating support leg into each elevating cylinder,
A spring holder made from a plate with a smooth top surface is fixed horizontally to the upper end of each lifting support leg, and a coil spring is wound above each lifting support leg, and the upper end of the coil spring is attached to the spring holder, and the lower end of the coil spring is lifted and lowered. Push pins are provided at the top end of each tube and vertically protrude from the bottom surface of each stage plate at positions corresponding to each spring holder, and are placed on the top surface of the spring holder, so when the stage plate is folded, the lifting support legs do not have to be moved manually. There is no need to pull up the stage plate, the coil spring automatically performs the operation, and the push pin is always in contact with the top of the spring holder, allowing the stage plate to open and close quietly and smoothly. There is no risk of damaging the holder, and when the stage plate is folded, the push pins lock the spring holder, so the lifting support legs will not suddenly pop out and injure the operator or those around them, allowing for safe handling. It is something.

Furthermore, the caster of this invention is attached to a horizontal slender connecting member, and the slender connecting member is integrated with a horizontal connecting rod and a support arm that is integrated with this connecting rod through a vertically erected elevator tube. All the members of are raised and lowered vertically,
Unlike conventional models, which move up and down vertically using force from diagonal directions, the robot only moves up and down completely, eliminating the need for mechanical friction and lubricants.
; There are almost no failures and it is extremely practical.

In addition, in this design, the inner end surface of each stage plate is cut outward as it goes downward, and the upper edges of the inner ends of a pair of stage plates are brought into line contact, so there is a gap between the upper edges of each inner end when the stage plates are deployed. Moreover, when the scale plate is opened and closed, the upper edge of the inner end of one stage plate enters the cut-out part of the inner end of the other stage plate, and the inner end surfaces do not come into contact with each other. In other words, the expansion of the stage plate It is similar to the conventional example in that there is no gap between the inner ends and the inner ends do not collide with each other when opening and closing, but unlike the conventional example, two types of links are combined to move the stage plate away Unlike a rotating stage, an extremely simple structure as described above is sufficient, which ultimately helps to reduce the number of parts and failures, and to reduce the weight of the stage itself.

[Brief explanation of the drawing]

Figures 1 to 6 show the foldable stage of this invention. Figure 1 is a front view in the folded state, Figure 2 is a front view in the unfolded state, and Figure 3 is a partially cutaway plan view of the same. ,
Figures 4 to 6 are action explanatory diagrams with the main parts enlarged, and Figures 7 to
Fig. 10 shows a conventional example, Fig. 7 is a front view in the unfolded state, Fig. 8 is an enlarged front view in the folded state, Fig. 9 is a side view of the same, and Fig. 10 is a partially cutaway view of the main parts. FIG. 1...Casters, 2...Stage plate, 3...Elevating legs, 4...Elevating cylinder, 5
......Coil spring, 7...Outer support leg, 8
...Connection rod, 9...Support arm, 11...
...Slender connecting member, 14...Push pin, 17.
...Spring holder.

Claims (1)

[Scope of utility model registration request] Two pairs of left and right elevator tubes 4, 4 standing vertically are provided, and these elevator tubes 4. 4. 4. 4 are arranged in pairs at the front and rear of the center, and the left and right lift tubes 4, 4 are connected with a space between them by horizontal connecting rods 8, and a pair of support arms 9 are installed near both ends of each connecting rod 8.
. Attach casters 1.1 at intervals in the front and back, and also install each elevator cylinder 4.
A spring holder 17, which vertically passes through the lifting support legs 3 and is made of a plate with a smooth upper surface, is fixed horizontally to the upper end of each lifting support leg 3,
A coil spring 5 is wound above each elevating support leg 3, the upper end of each coil spring 5 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 elevating cylinder 4, and a pair of stage plates 2 are provided. , 2 is rotatably attached to the upper end of each support arm 9, and a push pin 14 having a convex arc surface formed at the lower end is attached to the lower surface of each stage plate 2 at a position corresponding to each spring holder 17. The lower end of each push pin 14 is placed on the upper surface of each spring holder 17, and the upper ends of outer support legs 7, 7 are rotatably attached at intervals to the outer lower surface of each stage plate 2. This folding stage is characterized in that the inner end surface of each stage plate 2 is cut outward as it goes downward, and the upper edges of the inner ends of a pair of stage plates 2.2 are brought into line contact.