DE4140885C1 - Transport trolley for operating theatre table plates - has valves for liq. equalising in both, piston limited cylinder chambers in dependence on handle control - Google Patents

Abstract

The trolley has liftable operating table slabs which can be angled at right angles to the table axis by a service arm with a handle at its free end. The handle pivots round the arm axis to tilt the slab coupling and,when released,sets the coupling in angled or horizontal settings only. A double acting damper ram works between coupling and trolley foot. Depending on the handle settings, the valves (V1, V2) balance pressures both sides of the damper piston (A, B) and open and close when the handle is moved and released respectively.To prevent the coupling becoming fixed, the damper piston is connected to a positioner bar (5),whose indexing cams (6) work with a latching cam (10) as a function of the handle to lock the coupling horizontally and at angles beyond a preset value. USE/ADVANTAGE - For operating theatre and other surgical applications,with maintaining horizontal position irrespective of patient's weight.

Description

The invention relates to a transport trolley according to the preamble 1. A transport trolley of this type is known from DE-AS 26 39 205.

In such trolleys with tilt device there is the problem of the horizontal positioning of the inclinable Coupling of the dolly.

If the operator changes the horizontal position of the inclinable Coupling of the transport vehicle has not set exactly and so one on operating table top coupled to the transport trolley to the firmly anchored Column passes or an operating table top from the firmly anchored The coupling parts can take up the column on the transport trolley jam between the operating table column, operating table top and transport trolley.

Then the transfer process can no longer be carried out gently and smoothly will. In addition, malfunctions and possibly Damage to the construction parts occur.

When transport trolley according to DE-OS 26 39 205 tried to solve the problem by means of locking to loosen mechanically acting index bolts. The tiltable coupling part cannot be fixed in any position in the tilt area, and a snap of the index bolt in an index hole inevitably leads to one jerky deceleration of the inclination movement.

The invention aims to provide a trolley according to the preamble of Claim 1 to be designed so that the inclinable receiving clutch exactly can be aligned horizontally. If an operating table top on the Transport trolley is coupled, the inclination speed should also asymmetrically positioned patients regardless of the patient's weight be limited. The braking of the inclination movement should always be smooth respectively.

This is achieved by the characterizing features of claim 1.  

The mechanically controlled hydraulic locking means that the operating room Table top either in any, clearly recognizable inclination positions or in the exact horizontal position required for the Transfer of the operating table top to the operating table column is necessary can be locked. The operating table top is locked in one only approximate horizontal position at which the operator assumes the operating table top would really be in the horizontal position, is not possible. It is prevented by the proposed locking.

In the following an embodiment of the invention based on the Drawing explained in more detail. It shows

Fig. 1 is a schematic side view of a transport carriage for the operating table plates,

Fig. 2 is a hydraulic circuit diagram,

Fig. 3 shows a damping element with the training according to the invention.

As can be seen from FIG. 1, a transport carriage 1 for operating table plates 3 has a tiltable coupling part 2 , the tilting about a transverse axis perpendicular to the longitudinal axis of the operating table being possible. A damping element is provided between the tiltable coupling part 2 and the fixed part of the transport carriage 1 , which - cf. Fig. 3 - has a damping cylinder 9 , which is connected to the tiltable part 2 and - see. also Fig. 3 - has a damping piston 4 which is connected to the fixed part of the trolley 1 . An operating arm 11 is also attached to the tiltable coupling part 2 and has a handle at its free end which can be rotated about the axis of the operating arm 11 .

As can be seen from Fig. 2, there is a piston rod-side pressure chamber A via a hydraulic arrangement 7 with a valve V 1 and a flow restrictor D 1 in connection with a variable-volume hydraulic tank D. Likewise, a piston chamber-side pressure chamber B is above the hydraulic arrangement 7 with a valve V 2 and a flow restrictor D 2 in connection with the hydraulic tank D. Check valves R₁, R₂ the series connections of valve V₁ and flow restrictor D₁ or valve V₂ and flow restrictor D₂ are connected in parallel. The hydraulic arrangement 7 is dependent on the rotatable handle via a shaft 8 . By turning the handle and thus turning the hydraulic assembly 7 , the valves V₁ and V₂ are opened or closed together.

As seen from Fig. 3, is connected to the damping piston 4 to a position rod 5 having the index cam 6. The position rod 5 thus moves in parallel and simultaneously with the damping piston 4 .

A locking cam 10 is attached to the hydraulic arrangement 7 . In the position shown, the locking cam 10 is locked for the exact horizontal position of the inclinable part 2 of the transport carriage 1 . The valves V₁ and V₂ are completely closed in this position. No hydraulic fluid can flow between the pressure spaces A and B, and the inclinable part 2 of the transport carriage 1 is thus fixed. If the hydraulic assembly 7 is now turned out of the locking position by means of the handle on the operating arm 11 , then the valves V 1 and V 2 are opened. For example, only the inclinable part 2 of the transport carriage 1 can be rotated into any inclination positions via the operating arm. By rotating the inclinable part of the transporter 1 , oil flows from pressure chamber A to pressure chamber B or vice versa via the flow circuit D 1 , V 1 , V 2, D 2. The flow restrictors D 1 and D 2 limit the flow rate of the pressure medium and thus dampen the rate of inclination of the inclinable part 2 of the transport carriage 1 . If the inclinable part 2 of the transport carriage 1 is to be turned precisely into the horizontal position, then the hydraulic arrangement 7 is deflected with the locking cam 10 , the flow circuit is opened and the horizontal position is set via the operating arm 11 . The effect of the locking cam 10 and the index cam 6 is now that in an approximate horizontal position, which the operator may consider the exact horizontal position, the hydraulic arrangement 7 cannot be turned back into the locking position and the hydraulic circuit remains open. The hydraulic arrangement 7 can only be turned back into the locking position when a clearly visible inclination position or the exact horizontal position has been reached. The hydraulic arrangement 7 can be turned back automatically, for example, by a spring arrangement. The check valves R₁ and R₂ have the effect that any vacuum that occurs in the flow circuit areas between the pressure chambers A and B and the valves V₁ and V₂ is always sucked in hydraulic fluid from the hydraulic tank T and no spring action is caused by uncontrollable air pockets or by vacuum.

Claims (4)

1. Transport carriage ( 1 ) for operating table tops ( 3 ) of an operating table with removable operating table tops with the possibility of inclination about a transverse axis perpendicular to the longitudinal axis of the operating table, an operating arm ( 11 ) rigid with the inclinable coupling part ( 2 ) for receiving an operating table Plate is connected and has a handle at its free end which can be rotated about the operating arm axis and, when actuated, allows the inclinable coupling part ( 2 ) to be inclined and, when released, allows it to be fixed in the horizontal position and at least two discrete inclination angles, where, on the other hand, a fixation between the two angles of inclination and the horizontal position is not possible, a double-acting hydraulic damping element consisting of a cylinder ( 9 ) and a piston ( 4 ) being provided between the tiltable coupling part ( 2 ) and the foot part of the transport carriage , thereby notes that, depending on the control of the handle, valves (V₁, V₂) for fluid balance between the piston rod-side cylinder space (A) and the piston-bottom cylinder space (B), which are opened when the handle is turned or closed when the handle is released, and to prevent fixation of the tiltable coupling part ( 2 ) of the damping piston ( 4 ) is coupled to a position rod ( 5 ), which has index cams ( 6 ) and that, depending on the control, there is a locking cam ( 10 ) which interacts with the index cams ( 6 ) in such a way that the inclinable coupling part ( 2 ) can only be fixed exactly in the horizontal position and at inclination angles greater than a predetermined value. 2. Transport trolley according to claim 1, characterized in that in series with the valves (V₁, V₂) each have a flow restrictor (D₁, D₂) and each parallel to the series connection of valve (V₁, V₂) and flow restrictor (D₁, D₂) a Check valve (R₁, R₂) is provided and that the first series circuit (V₁, D₁) between one Hydraulic tank (T) and the piston rod side Cylinder chamber (A) and the second series connection (V₂, D₂) between the hydraulic tank (T) and the piston chamber side cylinder chamber (B) are provided. 3. Transport trolley according to claim 2, characterized in that the hydraulic tank (T) is variable in volume is. 4. Transport trolley according to claim 2 or 3, characterized characterized that the hydraulic tank (T) in the housing of the damping element is provided.