DE7405202U - Device for fine adjustment of an instrument table serving as a support for an optical device - Google Patents

Description

Device for fine adjustment of a carrier for an optical device serving instrument table

The present invention relates to a fine adjustment device an instrument table serving as a support for an optical device, preferably an ophthalmic device, the one with one for adjustment in the horizontal plane on all sides pivoted and rotatable lever for height adjustment is equipped.

There are known instrument tables for ophthalmic devices that are arranged for coarse adjustment via Guides can be moved in two mutually perpendicular directions in the horizontal plane · The fine adjustment is effected by means of a lever which is essentially perpendicular to the plane of the instrument table and with a ball on all sides is pivotably mounted. By means of this lever, the device can, for example, first switch to one and then to the other A patient's eye to be adjusted.

It is desirable to be able to adjust the height of the device without having to move from one control element to another to have to.

It is known to surround the lever used for fine adjustment in the horizontal plane with a rotatable member which is positively connected to a toothed wheel via a toothed belt, which in turn is via a vertical adjusting spindle moves the instrument panel * up and down. It is

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not easy with this construction, with a urine? the fine adjustment in the horizontal plane and at the same time a sensitive one Make height adjustment, as the rotatable organ can not be operated with the whole hand.

It is also known to use the fine adjustment lever with its control button to connect, which acts on a universal joint via an axis guided inside this lever, which via a shaft and a gear actuates a vertical spindle. The fine adjustment lever is connected at its lower end to a ball, in the center of which the universal joint is arranged and which is on the base plate the instrument table unrolls. Apart from the fact that horizontal movement is very limited here, sensitive height adjustment is difficult because the rotary knob cannot be operated with the whole hand can be operated. ...

Finally, a device is also known in which Fine adjustment lever is rotatable as a whole about its axis and causes a height adjustment. The lever is in one The sleeve can be pivoted in all directions, but is coupled to the sleeve in terms of rotation. This coupling is either through friction or caused by a known universal joint · When the lever is turned, the sleeve is taken along and actuates a vertical spindle via a gear connection.

Since in this construction the sleeve as a pivot bearing and at the same time as When the bearing is used for the pivoting movement of the lever, radial forces occur in the pivot bearing and lead to the application of forces of different magnitudes when turning the lever in the rest position and during a pivoting movement are.

It is the object of the present invention to provide a device for Fine adjustment of an instrument used as a carrier for an optical device, in particular an ophthalmological device

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to create an even, sensitive setting in the horizontal and the vertical plane is possible by means of a single element which can be actuated without reaching around.

The invention is based on a device that has one for Adjustment in the horizontal plane equipped with levers that can be swiveled on all sides and rotated for height adjustment 1st and is characterized in that the adjusting lever consists of a jacket designed as a handle, the lower one End via a universal joint with a rotatable, via further gear means for height adjustment of the part carrying the device of the instrument table serving toothed ring is connected and the one when pivoting around which you; -oh defined the universal joint Contains pivot point without play with the jacket coupled, but not rotatable inner lever, the lower end of which in a on a horizontal support engages the part of the instrument table resting on it, and the one outside the plane of the universal joint has a spherical thickening which is mounted in such a way that it sine HcriscntalversQhiebMng when the adjustment lever is pivoted of the entire instrument table.

With this device is therefore for the shift in the horizontal and the vertical plane a single actuating member is provided which can be grasped by the observer with the whole hand. This Actuating element is functionally split into two elements, each serving a different purpose and each having its own storage location. This ensures that the pivot bearing is not loaded with radial forces, so that in each Position of the adjusting lever for turning exactly the same force is to be used.

It is particularly useful, the spherical thickening of the Inner lever to be arranged between its lower end and the pivot point defined by the universal joint. Because of that this lies for the horizontal displacement of the instrument table decisive bearing below the pivot point for the pivoting movement

of the lever, so that the pivoting movement is squat on the instrument table is transmitted. This avoids that during the rotary movement of the lever necessary for height adjustment unintentional swivel movement directly affect the horizontal setting. The designer has the opportunity here « äurch Wäni us5 Äi? stsnd £ S ** =? l3? h »n d * n> The pivot point of the lever and the spherical thickening the orad of the reduction free to choose.

The invention is illustrated below with reference to FIGS. 1-3 accompanying drawings explained in more detail. Show in detail:

Fig. 1 shows an embodiment of one according to the invention trained instrument table in front view with the housing cut open;

FIG. 2 shows a section along the line H-II of FIG FIG. 2 shows a section along the line III-III in FIG. 2.

1 with a horizontal base plate is referred to, on which an instrument table 2 is arranged longitudinally and transversely is. This shift is conventional and does not need to be explained in more detail here.

The actual instrument holder is located in the instrument table 2 stored, which consists of an upper plate) and a tube 4. An optical device, preferably an ophthalmological device, is connected to the tube 4.

Serves for fine adjustment of the instrument table 2 in the horizontal plane and for adjusting the height of the instrument holder 3, 4 an adjusting lever 5 »which consists of a jacket 6 designed as a handle and an inner lever 7.

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The jacket 6 is articulated with a ring 10 via two bolts 8, 9 connected, which in turn is articulated to a toothed belt pulley 13 via the bolts 11 and 12. The universal joint described defines the pivot point of the adjusting lever 5 with respect to its pivoting.

As can be seen without further ado, the jacket 6 can be rotated about its vertical axis in every pivot position of the adjusting lever 5 and takes the toothed belt wheel 13 with it via the universal joint 8-12. A Zahriemen 16 runs over this wheel, which means the rings 14 and I5 is fixed. One rotation of the jacket 6 and so that the toothed belt pulley I3 is on the toothed belt 16 on Transfer toothed belt pulley I7, which has a sleeve with an internal thread. In this sleeve moves a vertical spindle l8, which is supported against the cover 3 of the instrument panel. When the toothed belt pulley I7 turns, the spindle moves 18 in the vertical direction and adjusts the instrument support 3, 4 according to the height. .... · -..-.- ..;: _ ^.

Between the vertical spindle 18 and your tube 4 is a sleeve I9 arranged, which is surrounded by a helical spring 20. This spring is supported on the bottom of the instrument table 2 and on the top Cover 3 and causes a weight utilization in the vertical— adjustment of the instrument panel 3 »* ·

In the exemplary embodiment shown, the inner lever 7 has spherical surfaces 21, 22 and 23. With the help of the upper spherical surface 21, the lever 7 is mounted in the jacket β in such a way that it is coupled to the jacket 6 without play when the setting lever 5 is pivoted about the pivot point defined by the universal joint. The lever 7 itself cannot be rotated.

The lower end 23 of the lever 7 engages in a pan of an intermediate plate 24 which rests on a plastic insert 25 connected to the plate 1.

The spherical thickening 22 is mounted in a ring 26, opposite which the toothed belt wheel 13 by means of a ball bearing 27 can turn.

When the setting lever 5 is pivoted, the inner lever 7 rotated around the pivot point defined by the universal joint and thereby displaces the instrument table via the connection 22, 26 2 in the horizontal direction. The table slides over: an intermediate plate 24, which with a self-lubricating ring ■ - '■>' is equipped.

As shown in FIGS. 1-3 *, the adjusting lever 5 in the new device has two different bearing points, one bearing point being defined by the universal joint 8-12 and only the one for vertical adjustment of the instrument holder?,. £. absorbs necessary rotary movement of the lever jacket 6, while the other bearing point 22, 26 serves to support the inner lever 7 and at a ¹ ; .VereefewetöcKtrig -des - ^ pa ^^ lpkhß ^ s ^ pd ^ - ^^ idör & ^ s ^ displacement of the Instrument table 2 ' causes. This horizontal movement takes place with a certain reduction. Their size is defined by the ratio of the distance between the pivot point and the lever end 23 to the distance between the points 22 and 23.

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Claims (4)

t t · 1 claims for protection 1. Device for setting an instrument table serving as a support for an optical device, which is equipped with a lever which is pivoted on all sides for adjustment in the horizontal plane and rotatable for height adjustment, characterized in that the adjustment lever (5) consists of a jacket designed as a handle ( 6), the lower end of which is connected via a universal joint (8-12) to a toothed ring (13) that can be rotated via further gear means (16, 17, 18) for height adjustment of the part (3 * ^) of the instrument table (2) that supports the device. is connected and the one when pivoting about the pivot point defined by the universal joint without play with the jacket (6) coupled, but non-rotatable inner lever (-7), the lower end (23) in a on a horizontal base (1) engages resting part (5) of the instrument table (2) and the-outside the plane of the universal joint has a series of spherical thickening (22), which are so mounted is that it causes a horizontal displacement of the entire instrument table (2) when the adjustment lever (5) is pivoted. 2. Device according to claim 1, characterized in that the spherical thickening (22) of the inner lever (7) is arranged between its lower end (23) and the pivot point defined by the universal joint (8-12). 3. Device according to claim 1, characterized in that the lever casing (6) is connected via the universal joint (8-12) to a toothed rlomenrad (I3), which is connected via a toothed belt (16) to a vertical spindle (18) which is used for height adjustment ) coupled let. 74MlMtI. ι * 4. Apparatus according to claim 1-3 * characterized in that between the vertical spindle (13) and the optical device a sleeve (19) surrounded by a spring (20) is arranged in such a way that the spring is against the bottom of the instrument table (2) and is supported against the upper plate (3) of the height-adjustable instrument panel (3 * 4). State of the art: DT-GM 1 818 245 CH-ps 446 758 DT-PS 1 263 347 7466202 2t IH