DE8600290U1 - Safety device for rope lifting devices - Google Patents

Description

FOGAUTOLUBE SA, Rue du Pre Neuf 58440 MYENNES
" Safety device for rope lifting devices"

The present invention relates to a safety device for rope lifting devices, in particular | for lifting platforms. |

There are known lifting platforms with two or four columns, | which have a platform for carrying a vehicle *. |

This platform is guided in the pillars and with pull ropes |

connected that cause their lifting. \

f On such lifting platforms it is essential to have a safety I

provide a device to block the platform, |

if a pulling rope breaks or if simply during yours!

Lowering the platform in contact with an object |

who overturns the vehicle carried by the platform |

could. 1

There are numerous safety devices, called safety devices, which have at least one feeler device that interacts with the rope and which have means
connected to block the platform in case
abnormal tension has been detected in the rope.

Telephone (0711) 29 6310 and 29 72 95 Pdätscfesk Shitteah (ÖL2 6CO \ O (> 75) 7? 11 -700 Telephone information and orders are

Telex 722312 (patwod) D ^ utstrfe Bank StufeaÄ (BLZ 600 * 700.7,0) 1428630 only after written confirmation binding.

- •• «4 - · '·· December 17, 1985 P 7027

All of these safety devices have the essential task of preventing the platform held by the ropes from falling in the event of an accident.

The ropes are generally equipped with a hydraulic ram connected, which is fed by a pump for lifting. The lowering takes place under the own weight, where dss Oil of the working cylinder flows back into a tank.

In this type of lifting device, the platform is carried in its raised position by the safety gear. This has pawls which interact with the teeth of the racks provided in the columns, so that thereby hurry to reduce the tension of the ropes.

In these lifting devices, a button is also provided that, when the platform is in the raised state, in Working together with the ropes, it detects fluctuations in tension and controls the safety gear. This is what happens above all when the platform rests on the pawls in the raised position. The tension of the ropes is more or less reduced. Since the setting of the buttons is very delicate and certain voltage changes occur during operation, it happens before that the platform is blocked, although the device is in a functional state.

The present invention is based on the object of creating a safety device for rope lifting devices, which does not have the various disadvantages of the known devices.

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'..'>'<. g.J '..' December 17, 1985 P 7027

This object is achieved according to the invention by the features of claim 1.

Thanks to the invention, the sensing device causes the opening of the circle for the pawls only when the detected Voltage difference when lifting and lowering the platform exceeds a prescribed value. This seemed to be the case not when the platform is stopped in an upper position, since in this position, even if a rope breaks, the risk of falling is excluded.

The features of claim 2 are directed to a preferred development of the invention.

The invention is described in more detail below with reference to a preferred design of an exemplary embodiment which is illustrated in the accompanying drawings, in which show:

Fig. 1 is a perspective view of an according to

the invention improved lift;

Fig. 2 an enlarged view of a perpendicular

Intersection of a column end with the associated end of the platform;

Figure 3 is a perspective view of a detail;

4 shows an electrical control circuit of the lifting platform,

- 6 - December 17, 1935 P 7027

In Fig ^ l a lifting platform is shown, the four columns 1, Z ₁ 3, 4 and a platform, which is designated as a whole with 5. The platform 5 comprises two cross members 6 and 7 which are guided in longitudinal slots 8 of the corresponding pillars, and the two rolling tracks 9 and 10 carry "The runway 3 is fixedly arranged, whereas dis runway 10 to dsn Trsver- hen is arranged movable to to match the different wheelbases of the vehicles to be lifted. At the top of each column 1, 2, 3 and 4, one of the ends of a rope 12 is attached (12a column 1, 12b column 2, 12c column 3, 12d column 4). Each rope 12 is guided over a pulley 13 which is attached to the corresponding end of the cross member 6 or 7. The free end of the cable 12 is attached to a piston of a working cylinder 15, with guide rollers 16 and 17 being arranged between the working cylinder and deflection rollers to ensure safe guidance of the cables.

The working cylinder 15 is supplied by means of an electric pump which has an electric motor 20 and a pump 21. the The pressure side of the pump is connected to the working cylinder via a flexible hose 24 with the activation of a non-return valve 25 15 connected. Furthermore, a return line 26 with a shut-off valve 27 is provided.

Each column 1, 2, 3 and 4 has a vertical metal rod iflit a series of elongated holes, creating a rack is formed.

Pawls 31 are provided for engagement with these racks 30 to form a safety system in the manner of a safety gear to build.

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- 7-17 December 1985 P 7027

Each of the pawls 31 is connected to a plunger 32 of an electric | magnets 33 by a rod 43 with the interposition of |

a spring 35 connected. When the electromagnet 33 under If there is tension, it tends to disengage the pawl 31 from the rack 30. If the electromagnet is switched off, the pawl is brought into engagement with the rack under the force of the spring I 35. ί

Each pawl 31 is made from a parallelepiped piece 1

formed, which in the region of its length on an axis 29 |.

is rotatably mounted and has a nose 31b, the front. ; the axis 29 is arranged. This nose is intended to be placed on the inner edge of a hole in a rack 30. The pawl also has a shoulder 31a which is arranged at the opposite upper end with respect to the nose 31b is.

Each end of the crossbars 6 and 7 carries a button 36, j

which is pivotably mounted on an axis 37 and which has a roller 38 which interacts with the associated cable 12. The button 36, which is rotatably mounted on the axis of the roller 38, has a rod 77 which can be displaced in a cylinder 78 is arranged, which is pivotably mounted on an axis 39 fixedly connected to the crossbeam. On the rod 77, a compression spring 40 is arranged, which at one end against an end piece 41 of the rod and presses against the cylinder 78 at its other end. In this way, the button 36 is under the action of the spring 40, which seeks to pivot it in the direction of arrow f. However, this movement is counteracted by the role ..: * «, which works against the Rope 12 pushes.

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- December 8 - 17, 1985 P 7027

Each button 36 has one of the ends of a rod 80 articulated by means of a bolt 84, the other end of which is articulated to a cam 83 by means of a bolt 85 connected is. The cam 83 is connected to a bush 81 which is mounted on an axis 82 connected to the platform is so that the cam can rotate about this axis.

The axis 82 and the sleeve 81 are arranged next to the nose 31a of the pawl 31 in such a way that to form a brake, which secures the locking of the pawl, the nose 31a is supported on the sleeve 81.

Each end of the crossbars 6 and 7 is provided with a breaker, which is so under the force of a spring 47, that it is normally held in a closed position of an electrical circuit. The interrupter has a feeler element 48, in the case of reducing the tension of the cable 12 by an actuator attached to the button 36 50 can be actuated.

Fig. 4 shows the electrical control circuit of the lift.

A transformer 51 is connected to a suitable electrical voltage source. The transformer supplies one Line 52, which has four interrupters 45 connected in series. This line 52 is to sinem control circuit for the lowering and parallel to a circle for the lifting of the platform.

The control circuit for the lowering has two breakers 55 and 56, which supply the with a return line connected four electromagnets 33 allows.

If
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9-17 December 1985

'! P 7027

The second control circuit for the lifting of the platform has a switch 59 which is coupled to the interrupter 56, a fast-melt fuse 58, a breaker 60, which is coupled to the breaker 55, a lower \ breaker 61 for the stroke end Urd a contactor 62 pressing

when the circuit is closed and the engine of the Starts the pump.

The device works as follows:

For lifting, the contact 59 is closed so that the motor 20 starts the pump 21 by means of the contactor 62. The Punspe 21 feeds via line 24 Pl under pressure into the Working cylinder 15, so that the ropes 12 by pulling the piston of the working cylinder lifting the platform 5 effect. In the course of this lifting, the pawls 31 are free and consequently jump along the racks 30 from tooth to tooth. The tap 27 is closed during the lifting command.

When the platform 5 has reached its intended height, the whole thing is stopped by opening the contact 59.

As long as the electromagnets 33 are not actuated, the pawls 31 under the force of the springs 35 remain with them the associated openings of the racks 30 in engagement.

= When the tap 27 is opened, the platform lowers until

this is carried by the pawls 31. This leads to a reduction in the tension in the ropes 12, see above that the buttons 36 tend to rotate under the influence of the rods 77 and the springs 40. But since the nose 31a of the When the pawl 31 is applied to the bushing 81 under force, this is bi'Dckiert and thus opposes the pivoting of the button 36 in the direction of arrow f.

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■ · II »

- December 10 - 17, 1985 P 7027

If you want to lower the platform 5, you have to do this first raise it slightly, on the one hand to tension the ropes 12 and on the other hand to reduce the load on the pawls 31 to reach. The pawls 31 then no longer rest on the lower edge of the openings in the racks 30 and can therefore no longer block the buttons 36.

In order to carry out this maneuver, the circuit breaker 59 is actuated, which closes the current circuit of the motor 20 by means of the contactor 62. The interrupter 59 is then opened and the interrupter 55 is closed. The individual electromagnets 33 are then under voltage via the line 52 and the return line 57. Of course, the shut-off valve 27 must first be opened in order to allow the platform 5 to be lowered due to its own weight.

When the cable 12 is not tensioned and the pawl 31 is therefore removed with its shoulder 31a from the sleeve 81, pivots the associated button 36 in the direction of arrow f, se that the actuating member 50 can actuate the associated interrupter 45. If the interrupter 45 is actuated the power supply of the electromagnet 33 is interrupted and the pawls acted upon by the force of the springs 35 31 are brought into the effective position. This makes it impossible to lower the platform.

If the platform encounters an obstacle during the lowering, the tension e \ n <:. s of the ropes 12 becomes disproportionate greatly reduced and the button 36 causes the opening of the associated breaker 45, which separates the electromagnet 33 from the power supply, so that the not in engagement The pawls 31 located immediately block the lowering by interacting with the racks 30.

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- II - December 17, 1985 P 7027

The design described above is simple, causes little costs and offers a very high level of security,

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Embodiment described limited. Numerous changes can be made to it in detail without that the scope of the invention is left.

Claims (1)

••• «ft« ■ ft P 7027 H; 5 November 1985 G 86 00 290.2 403508 FfJGAA) TOLUBE S.A., Rue du Pr§ Neuf 58440 HYENNES claims for protection 1. Safety device for rope lifting devices, in particular for lifting platforms, with a vertically movable platform (5) supported by ropes (12) is held, which are connected to a working cylinder (15) which can be driven by a Purape by a motor (20) (21) is to be fed, with a safety catch with pawls (31) which are movably arranged on the platform (5) and are supported by springs (35) are loaded to come into engagement with the teeth of a rack (30), the platform (5) in an upper Position is held by their pawls (31) on the teeth of the rack (30) and each pawl (31) with a core of a Electromagnet (33) connected to an electrical circuit for controlling the lowering of the platform (5) which energizes the electromagnets to disengage the pawls (31), with at least one sensing device (36) connected to the ropes (12) cooperates to determine in these voltage differences, with at least one interrupter (45) which is connected to the supply circuit of the electromagnets (33) in order to actuate them in the event of an abnormal tension of the cable (12) determined by means of the button (36), and with an electrical circuit for controlling the Lifting the platform, which has a power source for supplying the motor (20) and switches for opening the supply circuit of the electromagnets (33), characterized in that the safety device has abutment members (83) which can be locked by the pawls (31), which the action of the The tactile device (36) is opposed when the platform (5) is supported by its pawls (31) on the teeth of the rack (30). ■ · - 2 - December 17, 1985 P 7027 Safety device according to claim 1, characterized in that the pawls (31) are movably mounted on an axis (29) arranged at a point in the region of their length, that the pawls 3I) engage on one side with a side to the axis (29) with the teeth of the rack nose (31b) and on the other hand a shoulder (31a) which is offset laterally with respect to the axis (29) opposite the nose (31b), and that the sensing device (36) via a rod (80) is articulated to a cam (83) which is attached to a bush (81) rotatably mounted on an axis (82) and is arranged adjacent to the shoulder (31a) of the pawl (31) so that, if the nose (31b) is on a tooth of the rack, the pawl (31) is supported by means of ifires paragraph (31a) on the sleeve (81) to block it.