HU217290B - Lifting device mainly for theatre elevator - Google Patents

Abstract

The lifting device has a lifting device coupled to the gear unit. The essence of the invention is that there is a vertical directionally flushable seam (1) as a lifting device. To do this, a parallel and coaxial threaded groove (7) is connected. Above this lower end, preferably, the threaded groove (H) of the threaded blade (H) can be resiliently fixed at a lateral distance (h) by a fixed position (6) and, in this way, a way of inducing the threaded groove (7) and the thrust (1) to be lifted up and down. fit. A hollow nut (6) is a power transmission device, exemplified by a main-belt (10), driven by a driving torch (5) and supported by a bearing (9) suitable for picking up a vertical force from a load acting on its lifting shaft. The siphon (1) in the holder of the fixed pivot nut (6) has a lowering guide structure. ŕ

Description

The invention relates to a lifting device which is particularly suitable for theatrical sinks.

It is known that theatrical sinks are intended to create horizontal and inclined surfaces at different heights relative to the environment. The position of these surfaces must be accurately adjusted and small distances must be maintained between the surfaces moving relative to one another. In addition to theatrical descenders, the following requirements are required, among other things: the lowest possible level of noise during operation; minimal space requirements; maximum fire safety; optimize their buildability and impact on the architectural environment. We must emphasize the requirement that mechanical efficiency is favorable, not only because of energy consumption, but also because the price of advanced, controllable drive elements increases exponentially, so that poor efficiency can indirectly hinder the application of state-of-the-art solutions.

One of the drawbacks of theatrical sinking systems currently known and used is that they are guided during movement of sinking-rising surfaces by means of wires built into the walls of the building structure. As a result, the sinks of larger stage surfaces are forced to be very large because they have to reach from wall to wall. Under these conditions, more differentiated movements limited to smaller surfaces cannot be provided. A further problem is that these sinks are usually lifted by trapezoidal spindles, with the use of worm gear and gear gears, but the overall mechanical efficiency of these drives is less than 10%, so very low. Attempts have been made to replace the threaded spindles with hydraulic cylinders or so-called spiral lifts to improve efficiency, but the latter has not been able to eliminate the need for wires built into the wall and the aforementioned drawbacks, since the height-mount size also requires special spiral lifts.

DE 33 05 074 discloses a mechanical lifting device having a vertical tube connected to its releasable base plate. The upper end is an internal thread and can be screwed into this thread. Connected to the latter is a tubular housing and it holds a podium. In this solution, the spindle acts as a pressurized lifting column and directly lifts the podium, making the entire structure robust, material-intensive and cumbersome.

The theatrical lowering device disclosed in AT 379355 has a lifting device having a plurality of threaded spindles which rotates a nut corresponding to a given spindle below the floor level. These threaded spindles are depressed and their lower ends are always below the floor level. The spindles themselves, which do not have a lateral guide, fulfill the function of a mast, so they have to absorb high forces and therefore have to be sturdy and robust. In addition to the high material and cost requirements, including the relatively high energy requirements of operation, the drawbar also has the disadvantage of not raising the platform parallel to its own plane, but only tilting it.

Patent application AT 32 188 relates to a device for lifting railway vehicles, which thus has centrally loaded screws for lifting very heavy loads. Their tops are suitably designed to carry a load. This device cannot be used to move theatrical descents, sometimes requiring the platform to be tilted.

SU 1643-443 A (SERGIN V), Inventory Illustrated, Section Q38, Woche, February 26, 1992, Feber 1992, February 02, 92, by Dorwent Publications LTD London, discloses a mobile lifting device, which has a rotatable platform. This is held by pressed telescopic reels. The lifting mechanism is quite complicated, material intensive, due to the large dimensions and material consumption due to the pressed spindles. Not suitable for moving stage sinks.

SUMMARY OF THE INVENTION The object of the present invention is to provide a lifting device, which is preferably used for stage sinks, which does not require wires built into the walls of the architectural structure for its operation, provides efficient mechanical transmission, low noise and enables the use of state-of-the-art electrical and electronic drive elements. .

The present invention is based on the discovery that by raising and lowering stage stages or stage portions practically only by means of a tensioned spindle which is subject to tension or twisting, it is possible to use ball spindles with minimal noise and space requirements for optimum instead, it requires only wires embedded in the walls of the architectural structure, but only a retractable and retractable support column, which can be moved up and down vertically by means of a guide roller support.

On the basis of the above findings, the object of the present invention has been solved by means of a lifting device, primarily intended for stage sinks, having a lifting device comprising a threaded spindle and a rotating nut connected to the gear and connected by means of a ball drive nut, e.g. and wherein the lifting device comprises a column vertically movable up and down, to which is attached a threaded spindle to which a ball nut is pivotally mounted above its lower end, preferably at a distance less than half its full length, and thus, the threaded spindle, together with it, is adapted to move the column up and down and is supported on the column by means of a bearing capable of absorbing a vertical force from the load acting on the column. va; the column has a lateral guide in the region below the fixed ball ball nut; and the

The threaded spindle is connected to the lower end of the column by means of a sliding latch or similar connection to a member extending from the bottom of the column to a lateral bracket, preferably to a base plate, with a ball joint. It is advantageous if the column is preferably of circular cross section and is formed by a support tube and the upper end of the column is connected by a ball joint to the object to be raised, for example, a theater sinking platform member.

An embodiment of the lifting device is characterized in that the frame of the lateral guide means is fixed to a base, such as a theater building, and has pivotally mounted guide rollers which are laterally adapted to the outer surface of the column. In this case, it is expedient to have three guide rollers in three planes spaced apart and superposed one above the other, which are spaced at the same arc.

According to another feature of the invention, the substructure is provided with a shaft for receiving the column and threaded spindle.

It may also be advantageous to exemplify that an object, such as a theater sinking podium member, can be tilted in a certain direction on a support structure in the region of its end extending in the tilting direction, one of which is supported on the top of the support column. a structure allowing the object to move horizontally or substantially horizontally relative to the column. In this case, it is desirable that the displacement device consists of a rail fixed to the top of the post and a sliding guide fixed to the object, such as a podium member. According to a further feature of the invention, a motor, preferably an electric servomotor, is coupled to a given horizontal or substantially horizontal threaded spindle and is operatively connected to an angled lever to enable a certain object, such as a theater sinking pod member, to be tilted. which is pivotally attached to the upper end of a column of a lifting device associated with an object, such as a podium member, and is connected to the object by means of a lifting rod, the lower end of which is hinged to the nail lifter. In this case, it may be expedient to have two parallel plates spaced apart and spaced between each other, each having a threaded nut that functions as a hinge, allowing the threaded spindle to pass through this threaded nut, and has a body in which a geometric longitudinal through hole is formed perpendicular to its longitudinal axis and the threaded spindle is passed through this hole. According to another feature of the invention, the motor is connected to the object, for example to the podium member, to the angle plate mounted on the column, preferably to the top of the column, and the lifting rod is connected to the object on the one hand.

The invention will now be described in more detail with reference to the accompanying drawings, which illustrates a preferred embodiment of the lifting device and some structural embodiments thereof. In the drawings, Fig. 1 is a schematic side view, partly in vertical section, of an example of a lifting device in connection with a theater sink;

Figure 2 is a horizontal sectional view of the structure of Figure 1 taken along line A-A therein;

Figure 3 is a larger scale detail of B marked in Figure 1;

Figure 4 is a smaller vertical sectional view taken along line C-C in Figure 3;

Figure 5 is a larger scale detail of E marked in Figure 4;

Figure 6 is a partially sectional perspective view of the arrow F in Figure 5.

1-4. 1 to 4, each stage member of a theater sinking platform is supported by two lifting devices which, in addition to holding, lifting, lowering and tilting (transversely adjusting) the platform member, are guided precisely by the movement of the platform member.

As shown in FIG. 1, each lifting device has a vertical column 1, preferably made of tubing, with a parallel spindle 7 with a small lateral distance and an electric drive motor 5, preferably a servomotor, which rests on the bracket 5a. is designed to drive - rotate - a fixed 6-ball nut on a spindle. The ball bearing nut 6 is provided with a ball bearing 9 designed for vertical forces. The drive motor 5 is in operative contact with the ball nut 6 via the toothed belt 10. The ball nut 6 is located at a height h above the floor t of the theatrical building 16 at a distance less than half the height H of the column and may be secured, for example, to said bracket 5a which may be attached to a (not shown) part of the building structure.

The column 1 is supported by lateral guide rollers 2 to ensure proper accuracy of vertical movement of the arrow (Fig. 1). As shown in Figures 1 and

In Fig. 2, each column 1 is supported by six or six guide rollers 2, each with three guide rollers in a common horizontal plane which are spaced m apart. In each plane, the three guide rollers 2 are located at the same arc distance, i.e. the angle 120 in FIG. The six guide rollers 2 are embedded in the frame 3, which is essentially a welded sheet steel housing (Figures 1 and 2), the lower flange 4 of which is preferably used to insert a rubber washer 3

EN 217 290 Β - eg screws (not shown) secured to the substructure 16. By varying degrees of tightening of the bolts in the region of the flange 4, the columns 1 can be adjusted vertically to ensure that each of the pod members 17 moves parallel to one another during their vertical movement (Fig. 1, arrow). The lateral distance between each pod member 17 is about 5 mm, which is sufficient to prevent the pod members 17 from colliding with each other during tilting (see later). It should be noted that in Fig. 1, for better clarity, the guide rollers 2 are depicted to their left in their actual position to illustrate how the guide rollers 2 enclose and support the column. The guide rollers 2, which ensure a smooth run, are adjustable; for example, the positioning can be achieved by rotating eccentric shafts.

The column 1 is connected to the pod member 17 by a ball joint 8, which allows the pod member 17 to be tilted both longitudinally (parallel to the plane of Figure 1) and transversely (perpendicular to the plane of Figure 1). In the present embodiment, the ball joint itself is secured to the podium member 17 and the sleeve 20 receiving the ball joint 8 to the head plate 14 at the top of the post. At the bottom of the pillar 1 is a base plate 13 having a size smaller than the corresponding size of a manhole 19 recessed into the substructure 16 of the theater building 25; in other words, the column 1 moves down and out of the shaft as it moves up and down as indicated by the arrow in Figure 1.

As shown in Fig. 1, the lower end of the aforementioned threaded spindle 7 is connected to the base plate 13 of the column 1 by a ball joint 11, and the upper part is connected to the plate 14 of the column 1 by other means it does not apply force in the longitudinal direction of the threaded spindle, but does not allow the upper end of the threaded spindle 7 to move away from the plate 14 laterally.

With regard to the height of the ball nut 6 and the drive motor 5, it is noted that it is desirable to place them as low as possible. In practice, it is advantageous for the ball nut 6 to be located at a minimum height above the floor level t depending on the drive motor 5 and any structural members underneath the latter. The height h indicated in Fig. 1 is also influenced by the fact that the lower gripping and vertical guiding of the pillar 1 must be perfectly secure, which in the embodiment of Fig. 1 is provided by the distance m between the lower and upper guide roller triples. At a short distance above the plane of the guide rails 2 in the top row, it is expedient to install a 6-ball nut. Note that the 6-ball nut is a known item in its own right, such as that of the Swedish company SKF on the world market.

In Fig. 1 the configuration of the right column 1 differs from its left side in that it has a rail 18 mounted on its head plate 14, on which a guide b 15 of shorter length than the rail 18 is fitted. The purpose of this structural solution will be described below.

3-6. Figures 1 to 5 show a possible embodiment of a structure for transverse tilting (perpendicular to the plane of the drawing) of the podium member 17 (detail B in Figure 1). As shown in FIGS. 3 and 4, the structure 30 has a fixed motor 21, preferably an electric servomotor, and an actuated threaded spindle 22 for actuating the angle lever, all of which is designated by reference numeral 23. The motor 21 is coupled to the threaded spindle 22 through a gear 34 and a flexible clutch 35, which is guided through the threaded bore 32 of the threaded nut 31 (Figs. 3, 5 and 6). As shown in particular in FIGS. 3 and 6, the threaded nut 31 has a cylindrical body and the nail 23 has two parallel and spaced rectangular triangular plates 23a, 23b, and the cylindrical threaded nut 31. between them, they are pivotally mounted therein with pins 31a, 31b. In Fig. 6, the longitudinal axis x of the threaded spindle 22 and the cylindrical threaded nut 31 are drawn perpendicular to each other.

The parts of the structure 30 are connected to each other as necessary by ball-joint connections to the pod member 17 and to the head plate 14 of the column 1 so that the entire system can follow the transverse movements of the pod member 17 without any risk of tension. In the present embodiment, the motor 21 is connected to the podium member 17 by its engaging tabs 33 and the ball joint 24, and the angled lever 23 engages the lower right angles of the plates 23a, 23b, the tabs 35 and the ball joint 26 at the top 14 of the column. . The disks 23a, 23b, by virtue of their other lower corner region, are engaged by the ball joint 27 at their lower end and the upper end of this bar is engaged by the tabs 34 and connected to the podium member 17 by the ball joint.

1-4. 1 through 4, the throat sink is operated as follows:

for example, when the pod member 17 is to be tilted forward, the left column 1 shown in Fig. 1 is moved vertically upwards by actuating its respective drive motor 5 and consequently rotating the ball nut 6, since the rotation of the stationary ball nut 6 engages forces the threaded spindle to move axially upwards, and the spindle carries the column 1 (holding tube) during this movement. In this way, the platform load on column 1 is raised or lowered by the ball nut 6 using the threaded spindle 7, while the portion of the threaded spindle 7 under the ball nut 6 is always subjected to tensile stress and the ball nut above the ball nut.

Thus, the total weight to be lifted depends on the threaded spindle 7 and the vertical forces resulting from the load are applied to the bearings 9 supporting or bearing the ball nut 6. The tensile stress acting on the 7-spindle spindle under the 6-ball nut results from the load to be lifted and the torsional stress from

EN 217 290 Β math, on which the 6-ball nut on the 7-spindle must be rotated during lifting. Due to the fact that the lower spindle end grip is articulated (see spherical joint 11 in Figure 1), i.e. "tolerant" in the direction of torque, the upper clamping is solved by the sliding latch 12, and this kind of stress acting on the spindle section.

Thus, when the column 1 shown on the left in Fig. 1 is lifted as described above and the column 1 on the right remains in place, the pod member 17 is tilted down longitudinally. (According to Fig. 1, it occupies the upper end position of the left column 1, while the right column is partially lowered into the shaft 19.) As a result of the tilting, the centers of the tops of the columns 1 move away from each other. (The distance between the column ends is obviously the smallest if they are at the same height.) Since the skeletal structure of the pod members 17, which interconnects the column ends, is rigid and thus not capable of longitudinal variation, the increase in tilt distance would cause t (Fig. 1), the longitudinal movement of the slide 15 would not follow the tilt movement.

If we want to tilt the podium member transversely (i.e. perpendicular to the plane of the drawing),

3 and 4 are driven by a motor 21, preferably a servomotor, which rotates the threaded spindle 22. Depending on its direction of rotation, the angle lifter 23 will tilt in one of the directions indicated by the double arrow c and move the pod member 17 downward or upward to the desired transverse position via the lever rod 28. As a result of the rotation of the fixed screw spindle 22, in this forced engagement, the threaded nut 31 moves in a curved path in one direction and forces the lever 23 to move up or down, causing the lifting rod 28 to tilt the entire pod member 17. As already mentioned, the threaded nut 31 also functions as a hinged joint, and the connections between the elements of the structure 30 are hinged, so that the tilting is smooth and easy.

Regarding the position of the lever 23, it is necessary to take into account the fact that there is sufficient space, i.e. a sufficient distance between the top of the lever 23 and the lower plane of the platform member 17, which determines the possible degree of transverse tilting. . When tilting, the nailer 23 must not contact the underside of the pod member 17, for which the nailer 23 must be positioned so as not to obstruct the tilt.

In the case of the drive motor 5 and the motor 21 servo motors, the longitudinal and transverse tilting can be electronically coordinated. During transverse tilting, the change in distance between adjacent podium members will be minimal when the center of tilt of the ball joints 8 (Fig. 1) is placed as high as possible near the platform level.

Since the lifting devices, due to their relatively high mechanical efficiency, without being self-locking, would be lowered by the load, they are equipped with so-called double theatrical brakes, which completely prevent the lowering.

An advantage of the present invention is that it allows the lifting and lowering of platforms and platform members of various objects, in particular theatrical sinkers, without the use of wires fixed to an architectural environment such as a wall. The mechanical transmission is efficient, low noise, and the system incorporates state-of-the-art electrical and electronic drive elements.

A very important advantage of the present invention is to emphasize that the columns do not need to be interconnected by any transverse mechanical structure, so that the space between them is completely free and functionally exploitable. The lifting and lowering of columns can only be coordinated with electronic devices and there is no need for any mechanical forced connection or forced control.

The invention is, of course, not limited to the embodiment of the lifting device detailed and illustrated above, but may be implemented in various ways within the scope defined by the claims. For example, it is possible that a square podium member is supported in the center by only one lifting device according to the invention, in which case the post is also connected to the lower surface of the podium member by means of a ball joint. However, in this case, two transverse tilting mechanisms are required, and rotation of the platform around the vertical axis is also to be prevented.

Finally, it is to be emphasized that the lifting device according to the invention is applicable not only in the field of stage facilities, but also in the field of industry, agriculture and transport warehousing, where a load lifting is required.

Claims (12)

PATENT CLAIMS A lifting device, in particular for theatrical descents, comprising a lifting means comprising a threaded spindle and a rotating nut coupled thereto with an actuator and connected to a drive motor by means of a ball nut power transmission means, such as a toothed belt, comprising a movable column (1) to which a threaded spindle (7) is movably connected, with which a ball nut (h) fixed above its lower end, preferably at a distance (h) above the floor level (t), is less than half its total length (H). 6) is pivotable and thus fits in with the threaded spindle (7) and with it to move the column (1) up and down; supported on the column (1) by a bearing (9) capable of absorbing a vertical force from the load acting on it; the column (1) has a lateral guide in the region below the fixed ball nut (6) and with the lower end of the threaded spindle (7) for the element extending laterally from the lower end of the column (1), It is connected to the base plate (13) by means of a ball joint (11) and at its upper end to a head plate extending sideways from the upper end of the column (1) by means of a sliding latch (12) or by such a connection. Lifting device according to Claim 1, characterized in that the column (1), preferably of circular cross-section, is formed by a support tube. Lifting device according to Claim 1 or 2, characterized in that the upper end of the post (1) is connected to the object to be lifted, for example a member (17) of a theater sinking platform, by means of a ball joint (8). 4. Lifting device according to one of Claims 1 to 3, characterized in that the frame (3) of the lateral guide is fixed to a base, for example a substructure (16) of a theater building (25) and is pivotally connected to the outer surface of the column (1) are. Lifting device according to claim 4, characterized in that there are three guide rollers (2) in two planes spaced apart, spaced apart (m) and spaced in the same arc. 6. Lifting device according to any one of claims 1 to 4, characterized in that a shaft (19) for receiving the column and threaded spindle (7) is formed in the substructure (16). 7. Lifting device according to any one of claims 1 to 4, characterized in that, in order to allow a certain object, such as a theater sinking platform member (17), to tilt in a particular direction, the said object rests on a support structure, one of which is 1) at the top there is a device for moving the object horizontally relative to the column (1). Lifting device according to Claim 7, characterized in that the displacement device consists of a rail (18) fixed to the top of the post (1) and a sliding guide (15) which is fixed to the object, for example to the podium member (17). 9. Lifting device according to any one of claims 1 to 5, characterized in that a motor (21), preferably an electric servomotor, is connected to said object by means of a motor (21) connected to a horizontal threaded spindle (22) to enable it to be tilted in a particular direction. ) and the threaded spindle (22) is operatively connected to an angle jack (23) which is hinged (26) on the upper end of the mast (1) associated with the object, such as a pod member (17), and a lever (22). 28) is connected to the object by a lifting bar (28) connected to the object by means of its lower end hinge (27) and its upper end hinged (29). Lifting device according to Claim 9, characterized in that the angle lifter (23) has two parallel plates (23a, 23b) extending apart from each other, between which there is a threaded nut (31) which also functions as a hinge, which is mounted so as to be pivotable. , and the threaded spindle (22) is guided through this threaded nut (31). Lifting device according to claim 10, characterized in that the threaded nut (31) has a cylindrical body having a through hole (32) having a geometric longitudinal axis (x) perpendicular to its longitudinal axis (y) and the threaded spindle (22). ) is guided through this hole. 12. A 9 -11. Lifting device according to any one of claims 1 to 5, characterized in that the motor (21) is attached to an object, such as a podium member (17), to a head plate (14) fixed to the post (1), preferably to the top of the post (1). 28) is connected on one hand to the nail lifter (23) and on the other hand by means of a ball joint.