DE8024962U1 - ADJUSTABLE TRIPOD FOR OPTICAL OBSERVATORS - Google Patents

Description

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Adjustable tripod for optical observation devices

The innovation concerns an adjustable tripod with a tripod base, a stand column and a support arm designed as an articulated parallelogram for optical observation devices, in particular surgical microscopes.

Surgical microscopes have to be very sensitive horizontally and vertically be moved. It is therefore necessary to compensate for the weight of the surgical microscope attached to the stand with a counterweight. Since the space available at the operating table is very limited, a compact and closed design is also desirable for the stand .

From DE-PS 2161 396 and DE 23 20 266 adjustable tripods for optical observation devices are known which compensate the device weight by a counterweight. With a device weight of kp, for example, the counterweight must also be 15 kp, so that the required sensitivity is achieved on the observation device. Despite an optimal weight compensation, the user then has to move a very large mass which, depending on the adjustment speed, requires a more or less large adjustment torque. In addition, the balance weight requires a considerable amount of free space for unhindered movement. Since the equipment is very different depending on the area of application and the special requirements of an operation, the counterweights must also be very different. Exact weight compensation therefore places additional demands on the operator.

From the prospectus MIoOO-Ie-111.80 d ^ r Hr ma Wild, Heerbrugg, eats a Known tripod that uses a gas spring as a counterbalance. The disadvantage of this known stand is that due to the friction on the piston and an unbalanced residual torque remains on the piston rod, whereby the sensitivity of the device is impaired. It also results the gas spring has an open and bulky design, the dm opijration table is also undesirable.

The innovation is therefore based on the task of specifying a tripod,

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with any device weights with the smallest space requirement through the Operating personnel can be compensated quickly and easily, and dds enables sensitive adjustment of the device. Besides, it was Task of the innovation, the supply lines (electrical power supply, Light guide) in such a way that optimum operational safety is achieved and the surgeon is not handicapped. Beyond that, he should Tripod base get a shape that provides optimal stability with if necessary, easier mobility of the tripod connects.

The tasks set are achieved according to the novelty that for Compensation of the weight of the observation device used in the parallelogram an adjustable spring is arranged, and that the supply cable for the illumination of the observation device inside the tripod are relocated *

A closed design of the PuralleLogram is achieved in that it consists of two U-profiles, which are arranged so that they can be moved to each other and whose cavity accommodates the supply cables *

Increased safety in handling is guaranteed by that an adjustable stop is provided between the U-profiles, which limits the vertical movement of the U-profiles.

The stand base is advantageously T-shaped and has two each Rollers in the crossbeam and equipped with a roll in the longitudinal beam.

The advantages achieved with the innovation consist in particular in the sensitive horizontal and vertical movement of the observation device as well as in the closed and compact design

An embodiment of the innovation is shown in the drawing and is described in more detail below. Show it:

1 shows an overall view of the stand according to the invention; Fig. 2 is a partial section through the stand according to the innovation,

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FIG. ₁ 3 shows a partial section through the adjustable compensator with a tension spring to compensate for the weight;

4 shows a partial section through the adjustable compensating arm a compression spring to balance the weight;

5 shows a partial section through the tripod column;

Fig. ₄ 6 a plan view of the tripod base.

From the overall view of FIG. 1, the compact and space-saving Execution of the tripod clearly shows.

The stand base is designated with 1, the stand column with 2, the 3 inserts for the supply cables and 4 the compensation arm. In Figure 5, the receptacle for the used Beobächtungsgerät> The balance arm 4 is connected via a hinge 9 with a swinging arm 10 which is rotatable about the axis. 8 The exemplary embodiment shown in FIGS. 1 and 4 is equipped with a total of four supply drawers 3a to 3d; 3a is the drawer for the standard equipment; 3b is the insert for special devices, and the light guides are supplied through 3c. ₄ 3d is the supply insert for photo, film and television adaptations. If only a few inserts are required, the free openings can be closed by blanking plates. With 6 the visible roles of the stand base are designated and with 7 the connector for the power supply. 11 identifies the light guides and 12 various sockets for the electronic supply of the devices. The adjustment button for the compensating spring is labeled 17.

In the partial section shown in FIG. 2, the supply cables are numbered 14 designated. The other designations are the same as in FIG. 1.

3 and 4 show the adjustability of the counterbalance in Compensating arm 4. Between the U-shaped rails 4a and 4b, the tension spring 13 in FIG. 3 is arranged in such a way that, by shifting the point of application P, the product of weight G and weight arm Tq

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the product of the spring force Fp and the force arm fp is achieved, so G x Tq = Fp X rp

The weight compensation remains constant through the corresponding position of the attack point-5th P over the adjustment angle -Qb. The tension spring 13 has the advantage over the process known from the prior art counterbalance the advantage that it operates hysterefrei and a compact and closed construction allows * The downward stroke is impinged by an adjustable stop 14 onto which the rocker 15 is limited, Determining of the compensating arm at any height is achieved by means of the clamp 16 »A rod with the variable length b is clamped in the triangle with the fixed sides α and c is not shown, possible.

15th

In the illustration of FIG. 4, there is a balance arm with a compression spring shown, parts that correspond to the embodiment of FIG. 3 wear the same reference numbers. The compression spring is denoted by 17.

In the embodiments according to FIGS. 3 and 4, the weight compensation also take place in a known manner so that the spring 13 or 17 is axially or relaxed. In this case, the point of application P not relocated.

In Fig. 5, the stand column is shown in partial section, it shows the Maximum equipment of the column with the 4 supply modules. It is a design of the stand base is shown, which ensures optimal stability. The position of the stand castors is denoted by 6. A total of five rollers are used for the stand base according to FIG. The possible tilting axes of the tripod are aa, bb and cc and the extreme tipping positions with A, B, C.

For an extended swiveling and lifting possibility of the surgical microscope a double or multiple scissor arm is possible, with two or more of the described joint parallelograms interact. The connection the joint parallelograms karin rigid or articulated as required be.

Brd / Hm 040282

Claims (4)

ill «tit» tt Il 11 11 111 · Il III? Protection claims: 1. Adjustable tripod with a tripod base, a tripod column and a support arm designed as an articulated parallelogram for optical observation devices, in particular surgical microscopes, characterized in that to compensate for the weight of the observation device used an adjustable spring is arranged in the parallelogram and that the supply cable for the illumination of the observation device are routed inside the tripod. 2. Adjustable stand according to claim 1, characterized in that the Parallelogram consists of two U-profiles that can be moved towards each other are arranged and the cavity receives the supply cables. 3. Adjustable stand according to claim 2, characterized in that An adjustable stop is provided between the U-profiles, which limits the vertical movement of the U-profiles. 4. Adjustable stand according to claim 3, characterized in that the Stand base is T-shaped and equipped with two rollers each in the crossbeam and one roller in the longitudinal beam. ti Il · I