RU2703812C1 - Stair lift - Google Patents

Abstract

FIELD: hoisting devices.

SUBSTANCE: present invention relates to hoisting devices and can be used for movement of wheelchairs on stair flights and spans with arbitrarily complex trajectory. Stair lift comprises upper and lower tubular guides, bearing frame, swing load-carrying platform, carriage with rollers, motor, worm reduction gear and drive plates. Drive of the carriage includes two drive sprockets of chain transmissions, sprockets of drive rollers, chains of chain transmissions of drive rollers, unit of gear transmissions of top drive rollers, gear transmission of lower driving roller, unit of chain tensioners, upper driving rollers and lower drive roller, mechanism of speed limiter and eccentric catcher. Gear unit of top drive rollers includes main gear, idle gear and two top drive rollers with gear wheels fixed on them. Chain tensioner unit consists of two spring-loaded polyacetal chain tensioners located on one axis. Boards are made as rotary and installed on output shafts of sprockets and gears with possibility of rotation around axis. Upper tubular guide is also used as railing of ladder march. Worm gear motor is made single unit.

EFFECT: invention provides reduced roll slippage and higher reliability.

3 cl, 6 dwg

Description

The present invention relates to lifting devices and can be used to move wheelchairs along flights of stairs and flights with an arbitrarily complex trajectory.

The staircase lift for the disabled is known from the prior art (Patent for invention RU 2116238, Published: 07.27.1998), which contains a loading platform with a vertical load-bearing wall and a folding platform, installed using the upper and lower suspensions on rails in the form of two fixed on the wall a flight of stairs and tubular rails spaced in height. A longitudinal slot and a device for moving the loading platform are made in the upper rail. On the upper landing there is a drive with a drive sprocket on the output shaft, and covering it with a closed cable transmission, the traction branch of which is laid in the upper rail and equipped with ball traction elements evenly fixed along its length, and the return branch is laid in the lower rail and is equipped with uniformly distributed along her centering elements. The loading platform is connected to the traction branch by a leash sliding in the longitudinal slot of the upper rail, and its upper suspension is equipped with rollers resting on the upper rail. The cargo platform is also equipped with an additional leash, the upper and lower suspensions of the cargo platform are made in the form of carriages mounted on the bearing wall with the possibility of rotation about an axis perpendicular to the bearing wall, the upper carriage is equipped with a shelf located under the upper rail on which both leashes are fixed, the lower carriage equipped with four horizontal rollers with one-side flanges, covering the lower rail in pairs from above and below, and a vertical roller placed between them, contacting m with the side surface of the lower rail, the lower branch of the cable transmission is equipped with tubular cylindrical spacers rigidly fixed to the cable between the centering elements, the centering elements are barrel-shaped and freely mounted on the cable, the traction and return branches of the cable transmission are interconnected at the exit of the drive sprocket, and their second ends are fixed in the leashes of the upper carriage. The disadvantage of this technical solution is the difficulty of manufacturing the upper guide pipe with a longitudinal groove along the entire length, constant maintenance and lubrication of the cable transmission elements and sprockets. Due to the longitudinal groove and lubrication of the cable elements, the upper guide tube cannot simultaneously serve as the railing of the flight of stairs. Also, this design does not allow for the implementation of rather complex trajectories along staircases.

A known elevator, in particular an inclined elevator (Patent EP0525141 (B1) from 1995-05-17). The elevator, in particular the inclined elevator, has two fixed tracks that run parallel to each other, along which guide rollers mounted on roller bearings move, so that they can rotate and come in contact with the jitter profiles from different sides. At least one guide roller on each roller bearing is made in the form of a pinion gear. The circumference of the drive gear is pressed against the corresponding engagement zone of the track profile by the force of the spring so that the drive force of the drive gear is transmitted at least mainly to the track profile by means of a friction coupling. The disadvantage of this technical solution is that it is impossible to move this device along highly inclined and winding flights of stairs, since the device can tip over, and in most cases an accompanying person is needed to help move along the flight of stairs.

In the prior art, a ladder lift for variable slope sections (EP1053968 (B1) from 2005-04-06) is known, which comprises an upper guide rod and a lower guide rod that can be attached to a fixed structure and have a constant distance in the vertical direction. A movable frame slides along the guide rods and supports the drive motor. The main drive gear is driven by an engine and grids with an upper gear rail formed on the upper guide bar, and the stabilizer gear engages with a lower gear rail that is formed on the lower rail. The stabilizer pin rotates freely if the inclination of the guide rods exceeds a predetermined value, while the stabilizer gear is connected to the main drive gear if the inclination of the guide rods is below a predetermined value. The disadvantage of this technical solution is that this device uses toothed rails that do not allow their use as a railing, the inability to implement complex options for motion paths, increased wear of gears and rails during street construction of the device.

The closest in technical essence is the stair lift (Patent RU 2462408, publ. 09/27/2012 Bull. No. 27), which includes the upper and lower tubular guides, the carriage with drive and support rollers interacting with the guides, an electric motor, a worm gearbox made in as separate blocks. In this case, the driving rollers are located below the axes of the guides on the output shafts of the worm gear unit, the support rollers are located above the axes of the guides on the leads on bearing bearings, the leads are spring-loaded and rotatably mounted on the output shafts of the worm gear unit, the leads being inclined in opposite directions to vertical plane passing through the axis of the tubular guides. The disadvantage of this device is the design complexity and its unreliability due to the fact that the drive rollers are below the supporting guide elements.

The task to which the claimed invention is directed is to create a more reliable and simple design of the drive, to reduce the likelihood of emergency stops of the device due to slipping of the rollers along the guides and in case of overheating of the gear motor, and to increase the cycle of continuous operation of the drive system as a whole.

The problem is solved in that the staircase elevator includes upper and lower tubular guides, a supporting frame, a load-carrying platform, a carriage with rollers interacting with the guides, an electric motor, a gearbox, leash boards made spring-loaded, the rollers contain upper drive rollers and a lower drive roller, which due to the weight of the carriage and the tension of the spring installed between the circuit boards, the tube guides fit tightly, while one of the upper rollers is inclined to the other roller and the upper the guide tube, while three out of four rollers in the carriage are simultaneously driving and supporting, and guiding with synchronous drive of all the rollers simultaneously from one gear motor, the carriage drive includes at least two drive chain drive sprockets, drive roller sprockets , chains of chain drives of drive rollers, gear drive of the lower drive roller, gear block of upper drive rollers, including the main gear fixed to the drive shaft of the upper rollers, spurious gear two upper drive rollers with gears fixed on them, also contains a speed limiter and an eccentric catcher located under the lower drive roller and blocking the lower tube guide, contains a block of chain tensioners, consisting of two spring-loaded polyacetal chain tensioners, located on one axis, providing each tension of its chain of chain gears, and the leash boards are made rotating and mounted on the output shafts of the sprocket and gear block Rotating around an axis, wherein the platform is formed hinge, and the worm gear is formed. The upper tubular guide is also used as a stair railing. The worm gear motor is made as a single monoblock.

The technical result is the simplicity of the design, reducing the slippage of the rollers along the guides, increasing the reliability of the drive, increasing the duration of the drive’s working cycle, ease of operation and maintenance of the device, as well as reducing the energy consumption of users of this device.

The specified technical result is achieved by the fact that three of the four rollers used in this device are simultaneously leading and supporting, and guides with synchronous drive of all the rollers simultaneously from one gear motor. The main drive rollers are located above the axes of the guides, supporting below the axes of the guides. All rollers are located on the bearing axles and swing spring loaded circuit boards. Leaderboards are spring-loaded and rotating and mounted on the output shafts of the sprocket and gear block with the possibility of rotation around the axis. The worm gear motor is made as a single monoblock. The spring for springing the circuit boards has a force of 1000 N, which contributes to a more tight grip of the tubular guides by the rollers and creates a more complete frictional effect.

The invention is illustrated by drawings, which depict:

Figure 1 - shows a General diagram of the lift;

Figure 2 is a front view of a chain drive;

Figure 3 is a side view of a chain drive;

Figure 4 is a rear view of a chain drive

Figure 5 is a sectional view of the mechanism of the speed limiter and the catcher in the working position (a) and in the initial position (b);

Figure 6 - diagram of the device and the operation of the eccentric catcher.

In the figures indicated:

1 - gear motor with electric motor;

2 - leading chain drive sprockets;

3, 4 - sprockets of drive rollers;

5, 6 - chain drive chain drive rollers;

7 - block tensioners chains;

8, 9 - upper drive rollers;

10 - lower drive roller;

11 - speed limiter (brake roller);

12 - block gears of the upper drive rollers;

13 - gear lower drive roller;

14, 15 - tubular guides;

16 - supporting frame;

17 - load-carrying platform;

18 - board-leash;

19 - axis;

20 - case;

21 - threaded sleeve;

22 - cam;

23, 24 - bearings;

25, 26 - rollers;

27 - screw;

28 - ratchet wheel;

29 - profile square wheel;

30 - a leash;

31 - axis;

32 - switch;

33 - rocker;

34 - movie;

35 - counterweight;

36 - tension spring;

37 - sleeve;

38 - eccentric catcher.

The staircase elevator includes a guide rail, consisting of a lower 15 and an upper 14 tubular guides interconnected by adjustable vertical ties, a supporting frame 16 and a folding load-carrying platform 17. The upper tubular guide 14 is also used as a railing for the flight of stairs. The movement of the carrying platform is carried out from the drive, mounted on a supporting frame 16.

The carriage drive includes a worm gear motor with an electric motor 1, at least two chain drive sprockets 2, drive roller sprockets 3 and 4, chain drive chains of drive rollers 5 and 6, the gear block of the upper drive rollers 12, the gear transmission the lower drive roller 13 and the block of chain tensioners 7. The gear unit of the upper drive rollers 12 includes a main gear, a spurious gear and two upper drive rollers with gears fixed to them. The block of chain tensioners 7 consists of two spring-loaded polyacetal chain tensioners on one axis. Their execution on one axis facilitates the installation and adjustment of chain tension. Each of the tensioners provides tension to its chain of chain gears. One interacts with chain 5, the second with chain 6, in order to eliminate sagging chains, provide the necessary tension, and the springs provide a safety system in the event of an unexpected break in these chains.

The upper drive rollers 8 and 9 and the lower drive roller 10 due to the weight of the carriage and the spring tension tightly fit the tube guides and, having a drive from one gearmotor, by means of chain and gear transmissions, are fully synchronized in their movement. A compression spring with a force of 1000 N is installed between the circuit boards 18 (the spring is not shown in the diagram to ensure the visibility of the main structure). Due to its design, the mechanism of the speed limiter 11 ensures reliable locking of the lower tube guide in the event of an emergency, thus stopping the entire device.

The upper roller 8 is located obliquely to the roller 9 and the upper guide tube and is simultaneously spring loaded with a force of 1000 N to create the most dense frictional moment, preventing the entire block from slipping on the guide tube when the device is moving.

The gear block 12 of the upper drive rollers includes an asterisk 3, mounted on the drive shaft of the upper rollers, on the same shaft from the side of the rollers are fixed two gears of the upper roller block (not shown in the diagrams). One of them is bevel and interacts with the bevel gear of the upper drive roller 8. This bevel gear is mounted on the roller 8 and is together with it. The second gear wheel interacts with a spurious gear fixed on a separate axis on the lead plate of the upper roller block. Spurious gear transmits torque to another gear of roller 9, it is also made integrally with this roller. The gear ratios of these gears are selected so that both rollers 8 and 9 rotate at the same speed. The roller 8 is made at an angle to the axis of the lower roller 9 to eliminate vertical vibrations of the structure when moving along a complex path, so two gears are made conical. To enhance the efficiency of the frictional moment, in addition to tilting the upper roller 8 with respect to roller 9, a certain form of polyurethane coating of the rollers was calculated and used, and the hardness of the polyurethane coating used was calculated.

Chain 6 transmits torque from the drive sprockets 2 to the gear transmission of the lower drive roller. The sprocket 4 is on the same axis as the gear pair of the lower drive roller. As on the upper rollers, one of the gears is fixedly mounted on this roller and is a single whole with it. The gear ratios of this gear are calculated and correspond to the gear ratios of the upper block of rollers so that the rotational speeds of all the rollers are the same. As in the case of the upper rollers, the composition, hardness of the coating of the roller with polyurethane, as well as the shape of the profile are calculated in such a way as to provide the greatest frictional moment when moving the entire cargo device. The lower block also includes a speed limiter and a catcher. Thus, the gear motor 1, the drive chain sprockets 2, the chain drive chains of the drive rollers, the chain tensioner block 7, the gear block of the upper drive rollers, the gear drive of the lower drive roller, the speed limiter mechanism and the catcher are a single unit - a block of sprockets, gears and chain gears.

The speed limiter mechanism with a catcher consists of the following main components and parts: on one axis 19, rigidly connected to the housing 20 by a threaded sleeve 21, a cam 22 and rollers 25 and 26 are mounted on bearings 23 and 24. Four ratchet screws are fixedly attached to the roller 26 by four screws 27 the wheel 28 and the profile square wheel 29. On the sleeve 21, with the possibility of rotation around the axis, a leash 30 with an axis 31 and a switch 32 is mounted. The beam 33, pivotally connected to the axis 31, has a freely rotating roller 34 and a counterweight 35. The cam 22 is connected with leash 30 springs tension 36. Between the rollers 25 and 26, with the possibility of rotation, pivotally, on the sleeve 37, there is an eccentric catcher 38. The protruding part of the eccentric is permanently connected to the axis 31. The gas cylinder, acting on the housing 20, provides constant friction coupling of the rollers 25 and 26 with lower guide pipe. When the platform moves down, the rollers 25 and 26 receive rotation due to friction forces with the surface of the guide tube. Together with the roller 26, the ratchet wheel 28 and the profile square wheel 29 rotate. When rotating, the roller 34, moving along the outer surface of the square wheel 29, causes the beam 33 to oscillate relative to axis 31. At the same time, the opposite part of the beam, made in the form of a dog, moves over the profile surface of the ratchet wheel 28, repeating its contour. The mass of the counterweight 35 is selected so that when the platform moves down at rated speed, the beam 33, making oscillating movements, does not tear off the roller 34 from the square wheel 29 and, accordingly, the opposite part of the rocker arm - the dog does not engage with the ratchet wheel 28. When exceeded permissible speed of the platform downward, the amplitude of the rocker arm oscillation increases. The inertial force of the counterweight 35 deflects the beam to a larger angle, and the dog engages with the rotating ratchet wheel 28. In this case, the axis 31 connecting the beam 33, the leash 30 and the eccentric catcher 38, turning relative to the axis 19, engages the gear outer surface of the eccentric 38 with guide tube. The lower guide is jammed between the eccentric and the upper roller and the platform is held on the lower guide. At the same time, the switch 32 mounted on the side surface of the leash 30, moving the lever on the cam 22, disables the power supply of the main drive through the relay, which leads to the cessation of platform movement. The catcher returns to its original position when the platform moves up, using the emergency helm.

The operation of this stair lift is as follows.

At the boarding post, the user (or an accompanying person, an employee of the organization) lowers and unloads the load-carrying platform 17 through the control panel, drives into it in a wheelchair and turns on the drive of the lift carriage. The torque from the geared motor with electric motor 1, through the sprocket blocks 3.4 and 8.9, is transmitted through drive chain drives of the drive rollers 5.6 to the drive and support rollers 8.9 and 10, which interact with the tube guides 14 and 15 and due to the frictional moment (friction forces) it moves the supporting frame 16 with the load-carrying platform 17 along the guides 14 and 15.

The force in the friction pairs (drive / support roller - guide) must be sufficient to overcome the adhesion forces of the rollers 8.9 and 10 with the tube guides 14 and 15 when the rollers run around these guides. Spring-loaded boards-leashes 18 due to the spring force, as well as the weight of the platform, the shape and location of the rollers, provide reliable frictional contact of the rollers along the entire length of the guide line.

The location of the carrier plates 18 and their mobility around the axles of the chain gears provides a vertical arrangement of the load-carrying platform as it passes along the track and stabilizes it, especially in curved sections of the track. The mobility of the carrier plates 18 prevents jamming of the rollers due to possible fluctuations in the cross-sectional profile of the tube guides 14 and 15, especially in places of curvature of the path. The dimensions, materials, profile and cross-section, as well as the placement of the rollers on the leash boards 18, provide the maximum frictional grip effect, as well as the smooth movement of the platform 17 with the load when lifting and prevents slipping of the drive rollers when moving the load-carrying platform 17 down.

Claims (3)

1. Stair lift, including upper and lower tubular guides, a supporting frame, a load-bearing platform, a carriage with rollers interacting with the guides, an electric motor, a gearbox, spring-loaded drive plates, characterized in that the rollers comprise upper drive rollers and a lower drive roller which, due to the weight of the carriage and the tension of the spring installed between the leads, tightly fit the tubular guides, while one of the upper rollers is inclined to the other roller and the upper the guide tube, while the three rollers in the carriage are simultaneously driving and supporting, and guides with synchronous drive of all the rollers simultaneously from one gear motor, the carriage drive includes at least two driving chain drive sprockets, drive roller sprockets, chain drive chains of the drive rollers, the gear drive of the lower drive roller, the gear block of the upper drive rollers, including the main gear mounted on the shaft of the drive of the upper rollers, spurious gear and two additional drive rollers with gears fixed to them, while the staircase elevator contains a speed limiter and an eccentric catcher located under the lower drive roller and blocking the lower tubular guide, a chain tensioner unit consisting of two spring-loaded polyacetal chain tensioners located on one axis, each tensioning its own chain of chain gears, and the carrier plates are made rotating and mounted to rotate around the axes of the chain gears , The hinged platform is made, and the worm gear is formed. 2. The stair lift according to claim 1, characterized in that the upper tubular guide is also used as the railing of the flight of stairs. 3. The stair lift according to claim 1, characterized in that the worm gear motor is made as a single monoblock.

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