Separable rotary table

Abstract

The invention relates to a rotary table (1) for positioning a workpiece by means of a manual drive (4a, 4b), said rotary table comprising a base plate (2) having a base plate-side transmission device (20), and also comprising a bearing plate (3), mounted rotatably on the base plate and having a bearing plate-side transmission device (30), which is configured to rotate the bearing plate (3) relative to the base plate (2) by means of a drive (4), wherein the base plate (2) is formed as a two-part or multi-part component composed of at least two plate segments (2a, 2b), and wherein the bearing plate (3) is formed as a two-part or multi-part component composed of at least two plate segments (3a, 3b).

Claims

1. A rotary table for positioning a workpiece by means of a manual drive, said rotary table comprising a base plate having a base plate-side transmission device, and also comprising a bearing plate, mounted rotatably on the base plate and having a bearing plate-side transmission device, which is configured to rotate the bearing plate relative to the base plate by means of a drive, wherein the base plate is formed as a two-part or multi-part component composed of at least two plate segments, and wherein the bearing plate is formed as a two-part or multi-part component composed of at least two plate segments, and wherein a manual ratchet having a lever arm and a ratchet member is further provided, which is mounted on the bearing plate-side transmission device in order to bring the ratchet member in engagement with the base plate-side transmission device by actuating the manual ratchet about a radially extending rotational axis.

2. The rotary table according to claim 1, wherein the base plate is formed from two separate plate segments, which are connected to one another via locking means.

3. The rotary table according to claim 1, wherein the base plate is configured as a cylindrical plate having a central round opening.

4. The rotary table according to claim 1, wherein the plate segments of the base plate and/or the plate segments of the bearing plate are configured as mating plate segments.

5. The rotary table according to claim 1, wherein an at least two-part cover plate having a central opening is provided on the bearing plate.

6. The rotary table according to claim 1, wherein on an underside of the base plate a plurality of feet are mounted, which are cylindrical in shape and which further protrude with at least one foot segment beyond the edge of the base plate.

7. The rotary table according to claim 1, wherein the bearing plate is configured as a cylindrical plate having a central opening.

8. The rotary table according to claim 7, wherein a radial bearing protrudes outward on the underside of the bearing plate around the central opening.

9. The rotary table according to claim 1, wherein above the bearing plate an integral support plate having a central opening is provided, said opening extending to the edge of the support plate with a width that is substantially equal to the diameter of the central opening, resulting in an approximately U-shaped plate overall.

10. The rotary table according to claim 9, wherein on the support plate at least one lifting device is provided, which is arranged symmetrically to the central opening on the support plate.

11. The rotary table according to claim 10, wherein two lifting cylinders are provided.

12. The rotary table according to claim 1, wherein each of the plate segments of the bearing plate is configured as a bearing cage having a plurality of bearing rollers that protrude outward from a plate plane on the underside of the bearing plate.

13. The rotary table according to claim 12, wherein the bearing cage forms a plurality of radially extending rows of through openings, arranged one behind the other and spaced from one another, in which the bearing rollers are respectively mounted.

14. The rotary table according to claim 12, wherein each of the bearing rollers arranged one behind the other in a row is mounted on a shaft, which is installed in a radial direction and which extends up to an edge face of the bearing plate, and which protrudes outward on the face side from the bearing plate with face-side shaft sections.

15. The rotary table according to claim 14, wherein the bearing plate-side transmission device is formed at least partially by shaft sections of the shaft or bolts protruding from the face side of the bearing plate.

16. The rotary table according to claim 15, wherein a manual ratchet is mounted to said bolt protruding from the face side of the bearing plate.

Description

(1) Other advantageous refinements of the invention are characterized in the dependent claims and will be described in greater detail in the following, in conjunction with the description of the preferred embodiments of the invention, with reference to the figures.

(2) In the drawings,

(3) FIG. 1 is a side view of an exemplary embodiment of a rotary table according to the invention,

(4) FIG. 2 is a perspective view of the rotary table of FIG. 1, and

(5) FIG. 3 is a plan view of the rotary table of FIG. 1.

(6) In the following, the invention will be explained in greater detail with reference to FIGS. 1 to 3, wherein like reference numerals refer to the same functional and or structural features.

(7) An exemplary rotary table 1 for manual positioning of a workpiece is shown in FIGS. 1 to 3. The rotary table comprises a base plate 2, a bearing plate 3 supported on the base plate 2, a cover plate 4 mounted on the bearing plate 3, and a support plate 5 mounted on the cover plate 4.

(8) Base Plate 2

(9) In the following, base plate 2 will be described in greater detail. Base plate 2 rests on feet 7, which are mounted on the underside of the base plate. As is clear in particular from FIG. 3, a foot segment 7a projects outward beyond the outer periphery of base plate 2. Base plate 2 is composed of two plate segments 2a, 2b, with base plate 2 being configured as a cylindrical plate having a central opening 22. Each of the two plate segments 2a, 2b makes up one-half of the cylindrical plate 2. As is clear from FIG. 3, the two plate segments 2a, 2b are connected to one another by a locking means 21a, 21b. Locking means 21a, 21b is a spring-loaded bracket-type locking means, in which one retaining element 21a is attached to one plate segment 2a and the other retaining element 21a is attached to the other plate segment 2b. Corresponding locking brackets 21b are attached opposite one another on the respectively other plate segment 2a or 2b. As is further clear from FIGS. 1 to 3, on the upper side of the base plate 2, along the outer periphery thereof, a base plate-side transmission device 20 in the form of a ring gear is formed. Ring gear 20 forms a plurality of teeth 20a, arranged side by side and open outwardly. Teeth 20a have an outwardly decreasing tooth width. In the area of the ring gear, base plate 2 has a smaller thickness than in the remaining region, as is clear from step 24 in FIG. 2.

(10) Bearing Plate 3

(11) In the following, bearing plate 3 will be described in greater detail. Bearing plate 3 is likewise composed of two plate segments, i.e. the plate segments 3a, 3b. At the center of bearing plate 3 is a central opening 33. Around central opening 33, a radial bearing 34 with bearing rollers is formed, which protrudes outward from the underside of bearing plate 3 around the central opening 33 such that it fits and projects into the central opening 22 in the base plate. For this purpose, one half radial bearing bushing is formed on each of plate segments 3a, 3b, in which bearing rollers are rotatably arranged about an axis parallel to the axis of central opening 33 of bearing plate 3. The bearing rollers are thus arranged concentrically along a circle having a radius which is smaller than the radius of central opening 22 in base plate 2. The outer contours of the bearing rollers of radial bearing 34 are chosen such that when the bearing plate is mounted on the base plate, the radial bearing protrudes into central opening 22 of base plate 2 so that the two plate segments 3a, 3b abut against one another at their abutting faces, forming bearing plate 3.

(12) Each of the plate segments 3a, 3b of bearing plate 3 is configured as a bearing cage having a plurality of bearing rollers 34 that protrude outward from the plane of the plate on the underside of bearing plate 3. Each bearing cage, as is clear from FIG. 2, forms a plurality of radially extending rows 35 of through openings 36, arranged one behind the other and spaced from one another. In the respective through openings 36, bearing rollers 34 are mounted such that a rolling surface of each protrudes from the underside of bearing plate 3. As is further clear from FIG. 2, bearing rollers 34 arranged one behind the other in a row are each mounted on a shaft 37 installed in the radial direction. For this purpose, a respective bearing channel 34a extends through each row of through openings 36, which are arranged one behind the other and spaced apart from one another, into which channel a corresponding shaft 37 can be inserted.

(13) As is further clear from FIGS. 1 to 3, the length of a plurality of the shafts 37 is such that they protrude beyond the edge face 39 of bearing plate 3 and form a bearing plate-side transmission device 30.

(14) In other words, this means that the ten shaft sections 37a shown in FIG. 3 make up a part of transmission device 20, 30 on which a manual ratchet 50 is mounted in order to achieve rotation of rotary table 1, as will be described further below. In an alternative embodiment of the invention, in place of the extended shafts 37 bolt sections may be mounted on the edge face 39 of bearing plate 3, to with a manual ratchet 70 can then be attached.

(15) In the present exemplary embodiment, a cover plate comprising two plate segments 4a, 4b is further provided, which is likewise configured with a central opening, more specifically with a central opening 40. Located on cover plate 4 is a support plate 5 having a central opening 50, which, as is clear from FIG. 3, extends up to the edge of support plate 5 and has an opening width that corresponds to the diameter of central opening 50 of support plate 5. In this way, a substantially U-shaped plate is obtained, which can be easily installed around a drill bit that extends through central opening 50. Further provided is a clamping device 60, which is mounted on one of the protruding shaft sections 37a of a shaft 37. This clamping device can be used as a rotation lock in that, once a desired rotational position of the bearing plate relative to the base plate is reached, the clamping device 60 is rotated until a nose protrudes into a tooth 20a of the base plate-side transmission device 20, blocking further rotation.

(16) An intended rotation of bearing plate 3 relative to base plate 2 can be accomplished using a manual ratchet 70, as shown in FIGS. 1 to 3. Manual ratchet 70 is equipped with a lever arm 71 and a ratchet member 72 to which a ratchet tooth 73 is attached. Rotation about the axis A shown in FIG. 2, which is induced by actuating lever arm 71 of manual ratchet 70, causes ratchet tooth 73 to engage in one of the teeth 20a and to be displaced by a certain angle of rotation with further actuation of the lever arm. Thus, with ratcheting movements induced by the manual ratchet, bearing plate 3 can be rotated relative to base plate 2 by a desired angle of rotation, and once the desired rotational position of bearing plate 3 is reached, said bearing plate can be secured to prevent rotation by means of clamping element 60.

(17) Mounted on support plate 5 is a lifting device 6 consisting of two lifting cylinders 6a, 6b, which are arranged symmetrically to central opening 50 of support plate 5. Said device can be used to manipulate a workpiece upward or downward relative to the supporting plane of support plate 5.

(18) With the described embodiments of the present invention, it is possible to selectively manipulate a workpiece to adjust its rotational and height position by simple means, whereby even loads of around 30 tons can be manipulated using only the manual ratchet.

(19) The invention is not restricted to the preferred embodiment examples described above. A number of variants are conceivable that make use of the described solution even in fundamentally different configurations. For instance, it is conceivable for cover plate 4 to be dispensed with and/or for support plate 5 to be omitted and other options for supporting the lifting device to be used.