EP1161929A2 - Hydraulic system for a table, particularly an operating table, including a plurality of hydraulic actuators - Google Patents

Abstract

A lower part of an operating table has a moving mechanism framework (1) with moving rollers (2). This framework has a table support (3) fitted with a height-adjustable cover plate (4), onto which an operating table upper part can be fitted. Several hydraulic consumers provide adjustment. A reversing lever (22) selects the position of a sliding valve. A connector rod (24) links the reversing lever to a piston rod in the sliding valve.

Description

The invention relates to a hydraulic system for one hydraulic consumer table or Like., In particular operating table, with at least one Pump, which is optionally available to consumers via valves provides a flow from a tank.

Especially for operating tables with hydraulic Adjustment devices are provided, it is imperative the operation of the operating tables ensure if there is a defect in the hydraulic system. This relates in particular to electrical or electrohydraulically operated operating tables. Here is emergency operation is also necessary if the electrical system of the Table fails.

To remedy this problem, there are already operating tables become known who equipped with an emergency control panel are. With the buttons of this emergency control panel Electricity directly to the hydraulic pump and the solenoid valves be fed. With such a solution, however, only Defects in the area of manual control and partly in Area of circuit covered. However, it is indispensable also perfect operation of the solenoid valves and the Electric pump. Are the solenoid valves and / or the electric pump falling is an operating option for the table no longer guaranteed.

It is also known to have such an operating table Emergency power supply via a power cord or a power supply appropriate current strength. However, this is complex and only effective if the defect in the area of internal power supply via batteries.

Operating tables with two electric pumps are also known and two battery packs. However, this technique is very complex, but at least offers one operation Failure of an electric pump. The problem is, however Solenoid valves that control the individual functions. If they fail, the corresponding one is activated Cylinder no longer possible, so that a function of the Table is no longer given.

Tables with a mechanical valve are also known and a foot pump, which is also in the same hydraulic circuit also equipped with an electric pump could be. Emergency operation is completely without electronics possible, but the ease of use is normal limited by the fact that the mechanical valve by hand or foot must be operated. A convenient manual switch, especially by infrared transmission is not or possible with only disproportionate effort.

Another negative aspect of the previously known technology is the first fail safety of the hydraulic installation in terms of securing the hydraulic cylinders against unintentional adjustment. For this it can apart from malfunction of the electrical control, give two causes. On the one hand there can be leaks in the valves come in, causing the cylinders to load can adjust, on the other hand, it can damage the Lines come to the cylinder, causing the cylinder in the worst case suddenly gives way.

The object of the invention is to provide a solution with tables with several hydraulic consumers, especially operating tables, even if there are defects in the electrical or electronic system operated safely can be, whereby in the defect-free normal operation a comfortable operation should be guaranteed.

This task is accomplished with a hydraulic system at the outset designated type solved according to the invention in that a first funding route between the tank and the consumers with an electrically operated pump and electrically actuated valves and a separate second conveying path with a mechanical pump, especially a foot pump and is provided with mechanical valves, between the consumers and the electrically operated valves or the mechanical valves switch valves arranged are such that the flow to the respective consumer either from the electrically operated pump or the foot pump is provided.

According to the invention, a hydraulic system for one Table, especially an operating table which two working separately Pumps with valve system used. About the foot pump and the mechanical valves is always without further preparation complete operation of the table possible, no matter what component of the electrical system fails. At the same time, the table with the electrical Components with contemporary ease of use full manual control and the option of infrared remote control. The two are linked System components virtually automatic via the changeover valves, without the user noticing, i.e. if that electrical system fails, the user can immediately do that activate the mechanical system via the foot pump and the respective component by setting the actuate the mechanical valve without any further Action is needed. The only conceivable error of these changeover valves is an increased leakage rate in operation (e.g. due to contamination), but this is for the Function of the table irrelevant.

To save space in the additional mechanical system Being able to accommodate a table is particularly advantageous provided that the mechanical valves from a Gate valve with an inlet connected to the tank and several outputs connected to the changeover valves are formed. It is particularly preferred provided that the slide valve has a cylinder side exits and a piston that can be moved inside having a piston rod, wherein in the piston rod continuous inner bore is formed as an input.

To further increase the compactness of the system, it is very preferably provided that at the respective exit of the slide valve outside the cylinder Switch valve is arranged.

The switch valve preferably has on the underside an input from the respective outlet of the slide valve and thus in alignment on the opposite side Input from the associated electrically operated valve and crosswise to an exit to the respective consumer, the inputs at rest by means of a common Lock ball are closed.

The changeover valves are particularly preferred and the slide valve a common assembly, whereby formed a very compact assembly which is simple and space-saving in the substructure of the Operating table can be integrated. With this configuration is the hydraulic oil of the foot pump through the Inner bore of the piston rod and the piston depending on Position the slide valve from below in one of the changeover valves headed. The hydraulic oil of the electric pump is contrasted with hydraulic pipes and fittings directed into the respective changeover valve from above. The consumers are connected to the changeover valves via cables connected. The in the changeover valves arranged balls either give the input from the slide valve or the input from the screw connection to the solenoid valve or close it.

If the simultaneous operation of both pumps is excluded should be provided that the Foot pump via an electro valve coupled to the electro pump is switchable without pressure. Immediately after standstill the foot pump can then be used again.

The hydraulic oil is transferred from the respective changeover valve Hoses and / or hydraulic pipes to the respective consumer (e.g. hydraulic cylinder). Preferably each consumer with two consecutively arranged Check valves equipped that act redundant. This two valves in turn form a very compact unit in one housing. This means that the hydraulic oil must go through two blocking stages in succession, one Leakage of one step does not affect the Functions. Through the fixed attachment of the check valves In extreme cases, even the hydraulic hoses in the Table can be severed without making it a direct one Security risk comes.

Fig. 1

das Unterteil eines Operationstisches ohne Seitenverkleidung mit erfindungsgemäßem Hydrauliksystem in perspektivischer Darstellung,

Fig. 2

ebenfalls in perspektivischer Darstellung das Hydrauliksystem ohne Hubzylinder,

Fig. 3

das Hydrauliksystem nach Fig. 2 von der Rückseite gesehen,

Fig. 4

in perspektivischer Darstellung die Säule des Operationstisches ohne Seitenverkleidungen,

Fig. 5

in perspektivischer Darstellung ein im Hydraulik system eingesetztes mechanisches Schieberventil mit daran direkt angeordneten Umschaltventilen als Baueinheit,

Fig. 6

eine Draufsicht auf die Baueinheit nach Fig. 5,

Fig. 7

einen Schnitt gemäß Linie VII-VII in Fig. 6 und

Fig. 8

einen Schnitt gemäß Linie VIII-VIII in Fig. 7.

The invention is explained in more detail below with reference to the drawing. This shows in

Fig. 1

the lower part of an operating table without side paneling with the hydraulic system according to the invention in a perspective view,

Fig. 2

also in perspective the hydraulic system without lifting cylinder,

Fig. 3

2 seen from the rear,

Fig. 4

in perspective the column of the operating table without side panels,

Fig. 5

a perspective view of a mechanical slide valve used in the hydraulic system with switching valves arranged directly thereon as a structural unit,

Fig. 6

5 shows a plan view of the structural unit according to FIG. 5,

Fig. 7

a section along line VII-VII in Fig. 6 and

Fig. 8

a section along line VIII-VIII in Fig. 7.

Only the lower part of an operating table is shown in FIG. 1 shown without side panels, which initially has a chassis frame 1 with castors 2. On this frame 1, a table column 3 is arranged, which equipped with a height-adjustable cover plate 4 is on the top of an operating table, not shown can be assembled.

The individual adjustment functions of the operating table to ensure multiple hydraulic consumers provided, which is only partially shown in the drawings are. 4 is first a cylinder 5 shown for the Trendelburg adjustment of the operating table and a cylinder 6 for the lateral adjustment of the Operating table. It is also a height adjustment Lift cylinder, not shown, as a further hydraulic Provided consumer, its hydraulic connections are designated by 7 in FIG. 3. The hydraulic connection lines (Pressure lines) for the two cylinders 5 and 6 are designated by 8 in FIG.

To actuate these hydraulic consumers for adjustment of the operating table in different directions the hydraulic system first has a tank 9 on. A mechanical foot pump is integrated in this tank 9, which via a shaft 10 with a foot pump lever 11 is connected.

In addition to the foot pump, the hydraulic system also has one electric pump, preferably an electrohydraulic Pump 12, which via a suction line 13 with the Tank 9 is connected.

The hydraulic system points between the tank 9 and the Consumers (cylinders 5 and 6 and lifting cylinders) two Conveyance routes, the first of which is the electric pump 12 and the second conveying path is the mechanical foot pump includes.

The second delivery path starts from the tank 9 with the Foot pump has a pressure line 14 formed as a tube, which is designed as a flexible hose line further pressure line 15 opens. These pressure lines 14, 15 make a connection between the tank 9 via the Foot pump to mechanically operated switching valves, which depending on the position of the mechanically operated switching valves a connection with the respective consumer produce. These mechanically operated switching valves are of a slide valve 16 in the embodiment formed, the structure of which is best shown in FIGS. 5 to 8 is shown. This slide valve 16 has a cylinder 17, in which a piston rod 18 with piston 19 is guided, the piston rod 18 with a continuous Inner bore 20 is provided as the input in the slide valve 16 is used, for which purpose a connecting element 21 is provided with the end of the pressure line 15 of the foot pump is connected.

There are several on the side of the cylinder 17 of the slide valve 16 Outputs or output bores 21 are provided in the manner described in more detail below with the hydraulic Connected to consumers. Depending on the position the piston 19 within the cylinder 17 is the tank 9 via the inner bore 20 and the piston 19 with a Output 21 in hydraulic connection and enables Supply of the hydraulic oil to the consumer concerned.

To actuate the slide valve 16 is a in Fig. 1 Switch lever 22 shown, the embodiment of three actuators on a common Welded structure is formed. This switch lever 22nd is a display element 23 for displaying the selected position of the slide valve 16 is provided, also a Connecting rod 24 for connecting the switching lever 22 provided with the piston rod 18 of the slide valve 16.

By mechanical actuation of the switch lever 22 thus the slide valve 16 can be adjusted so that from tank 9 via the foot pump to a hydraulic connection assigned to the respective hydraulic consumer Output 21 of the slide valve 16 is produced.

The first delivery route from the tank 9 via the electric pump 12 contains in addition to the suction line 13 from the tank 9 to the electric pump 12 a pressure line 25, which is too electrical actuatable solenoid valves 26 which serve, depending after actuation of the respective solenoid valve 26 a Connection between the tank 9 via the electric pump 12 to the respective hydraulic consumer put.

To operate the electric pump 12 and the solenoid valves 26 is otherwise indicated in Fig. 1, a hand switch 40.

The connection of the two delivery routes from tank 9 to Consumers take place in such a way that between the electrical actuated solenoid valves 26 and the mechanical valves, i.e. the slide valve 16 switching valves 27 are provided are used to stop the flow from the tank 9th to the respective consumer either from the electric pump 12 via the first conveying path or the foot pump via the to provide a second funding route. These switch valves 27 are preferred in the illustrated embodiment formed as a unit with the slide valve 16. there has the respective switching valve 27, which at Embodiment all integrated into a common block are aligned with the outputs 21 of the slide valve 16 each have an underside entrance 28 on and thus one in alignment on the opposite top Input 29 on which each have a connecting line 30 is connected to the solenoid valves 26. Across each changeover valve 27 points to the inputs 28 and 29 an output 31, the inputs 28 and 29 are in the rest position each with a common locking ball 32 closed.

For example, if the foot pump is actuated, hydraulic oil occurs according to the position of the slide valve 16 from an output 21 of the slide valve 16 and through the assigned input 28 into the relevant switching valve 27, whereby the associated locking ball 32 is moved out of its closed position while doing so at the same time the opposite entrance 29 of the other closes electrical delivery path, so that the hydraulic oil through the assigned output 31 from the changeover valve can leak. When operating the electric pump 12 the flow process takes place in reverse.

On the one hand, the outputs 31 of the changeover valves 27 the connections 7 for the lifting cylinder, not shown connected and on the other hand the pressure lines 8, the lead to other consumers via connections 33, i.e. to cylinders 5 and 6. There are connections to these 33 initially connected flexible hydraulic hoses 34, which via redundant two-stage check valves 35 or 36 and fixed pipes 37 to the cylinders Guide 5 or 6. The check valves 35 and 36 are redundant trained, i.e. the hydraulic oil must be in sequence go through two blocking levels, a leak of one level does not impair the function. Through the fixed attachment of the check valves 35, 36 to the cylinders 5 and 6 via the pipes 37 can in extreme cases the hydraulic hoses 34 are severed in the table, without a direct security risk.

To a simultaneous when actuating the electric pump 12 Can prevent actuation of the mechanical foot pump an electric valve connected in parallel to the electric pump 12 38 with bypass line 39 may be provided. In operation the electric pump 12 is then via this solenoid valve 38 the foot pump is depressurized. Immediately after The foot pump is then at a standstill again of the electric pump 12 applicable.

Alternatively, it can also be provided that both the foot pump and the electric pump 12 at the same time can be operated so that it is possible, depending on the position the solenoid valves 26 and the spool valve 16 simultaneously to operate several functions of the operating table. In Fig. 3 are moreover with 41 connections Collection of the returned hydraulic oil (valves and Electric pump).

Of course, the invention is not limited to that shown Embodiment limited. Other configurations are possible without leaving the basic idea. So can e.g. the switching valves 27 also designed differently his.

Claims (8)

Hydraulic system for a table or the like which has a plurality of hydraulic consumers (5, 6), in particular an operating table, with at least one pump which optionally provides the consumers (5, 6) with a delivery flow from a tank (9) via valves,
characterized in that between the tank (9) and the consumers (5, 6, 7) a first delivery path with an electrically operated pump (12) and electrically operated valves (26) and a separate second delivery path with a mechanical pump, in particular a foot pump and with mechanical valves (16) is provided, switchover valves (27) being arranged between the consumers (5, 6, 7) and the electrically operated valves (26) or the mechanical valves (16), in such a way that the delivery flow to respective consumer (5,6,7) is provided either by the electrically operated pump (12) or the foot pump. Hydraulic system according to claim 1,
characterized in that the mechanical valves are formed by a slide valve (16) having an inlet (20) connected to the tank (9) and a plurality of outlets (21) connected to the changeover valves (27). Hydraulic system according to claim 2,
characterized in that the slide valve (16) has a cylinder (17) with lateral outlets (21) and a piston (19) with a piston rod (18) which can be moved therein, a continuous inner bore (20) in the piston rod (18) as the input is trained. Hydraulic system according to claim 2 or 3,
characterized in that a changeover valve (27) is arranged at the respective outlet (21) of the slide valve (16) outside the cylinder (17). Hydraulic system according to claim 4,
characterized in that the changeover valve (27) has an inlet (28) on the underside of the respective outlet (21) of the slide valve (16) and thus in alignment on the opposite side an inlet (29) from the associated electrically operated valve (26) and one across it Has outlet (31) to the respective consumer (5, 6, 7), the inlets (28, 29) being closed in the rest position by means of a common locking ball (32). Hydraulic system according to claim 2 or one of the following,
characterized in that the changeover valves (27) and the slide valve (16) form a common structural unit. Hydraulic system according to claim 1 or one of the following,
characterized in that the foot pump can be switched without pressure via an electro valve (38) coupled to the electro pump (12). Hydraulic system according to claim 1 or one of the following,
characterized in that each consumer (5,6) is equipped with two check valves (35 and 36) arranged one behind the other.

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