DE1281369B - Mechanical-hydraulic clamping device, especially machine vice - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

B 25b

German class: 87 a -1/01

Number: 1281369

File number: P 12 81 369.3-15 (A 36098)

Filing date: November 23, 1960

Opening day: October 24, 1968

The invention relates to a mechanical-hydraulic clamping device with a fixed and a movable jaw and a spindle for the relative movement of these jaws, with im A primary and a secondary piston are arranged at the free end of the spindle with enlarged diameter and the latter causes the displacement of the movable jaw.

In a previously known vice of this type, the spindle is passed through both clamping jaws, wherein the movable clamping jaw is slidably seated on this spindle. With this one open installation of the spindle, its function is impaired by chips. The guidance of the clamping jaws is also insufficient and only a short stroke of the movable jaw is possible. This previously known mechanical-hydraulic vice also has the disadvantage that the hydraulics, d. H. the Secondary piston, acts directly on the movable jaw. As the hydraulic medium is not compressible, this vice is only a hard, inelastic clamping possible, whereby there is also the risk of overloading or excessive pressure on the clamping jaws. Furthermore, since after a workpiece has been clamped, it is affected by the unevenness of the surface, etc. is subsequently compressed something, so is with the previously known vice, in which the secondary piston acts directly on the clamping jaw, the clamping pressure afterwards considerably decreased so that the workpiece becomes loose.

It is also a mechanical-hydraulic machine vice of the not usual type with an open Spindle known in which the entire hydraulic system, i.e. both the primary piston and the secondary piston, is arranged within the spindle. This results in a very large diameter of the spindle, So a heavy type of vice with considerable material costs. There is also an exchange of the entire mechanical-hydraulic drive part against a spindle of a normal Machine vices are not possible, as this is previously known compared to this mechanical-hydraulic spindle Vice has a much larger diameter.

There is also a mechanical-hydraulic machine vice known in which the entire Hydraulics (primary and secondary piston) is located inside the slide, with the on the primary piston displaceable secondary piston is mounted within the slide. The spindle is thus designed as a hollow spindle and is used to position

Mechanical-hydraulic clamping device,
especially machine vice

Applicant:

Franz Arnold, 8960 Kempten, Spatzenweg 48

Named as inventor:

Franz Arnold, 8960 Kempten

tion of the primary piston extending in a pressure chamber near the movable clamping jaw, the

* 5 moved in the direction of this clamping jaw for clamping will. The hydraulic pressure moves the secondary piston in the opposite direction and pressed against the spindle end. About the hard and inelastic tensioning mentioned at the beginning To avoid this, an extensive disk spring package is interposed between the secondary piston and the spindle. This previously known mechanical-hydraulic machine vice has the disadvantage of complicated design. In addition, the mechanical-hydraulic drive of this vice is not against the spindle of a mechanical machine vice is interchangeable.

It is also a mechanical-hydraulic vice known with a covered spindle, in which in the free spindle end enlarged in diameter a primary and a secondary piston is arranged. Not common for machine vices However, the hydraulic clamping pressure is not with the secondary piston 4, but rather with the Secondary cylinder transferred to the rear end of the slide, so that this in view of the high hydraulic pressure is stressed very unfavorably on bending or kinking, so a heavy design is required.

The invention is based on the object, while avoiding the aforementioned disadvantages, a mechanical-hydraulic Clamping device, in particular machine vice, easier to create and of such a design that the entire mechanical-hydraulic The drive part (hydraulic spindle) is exchangeable, d. H. with a normal machine vice, its mechanical drive part (spindle) without any conversion against a mechanical-hydraulic one Drive part (hydraulic spindle) can be exchanged. It should also be an elastic one with the hydraulics Clamping of the workpiece can be achieved without the interposition of a spring assembly.

809 628/1321

Claims (1)

3 4 In the case of a mechanical-hydraulic primary piston 4, this task is performed in the pressure chamber 3 with a clamping device of the type mentioned at the beginning. The hydraulic pressure generated thereby moves solved by the fact that with a machine vice with a concealed spindle in particular as the secondary piston 5 and thus the piston rod 8, in direction A, so that this piston rod with its clamping device formed the spindle a continuous 5 end 8 α a high Has clamping pressure on the slide longitudinal bore and exerts in this displaceable with the jaw 9. The hydraulic clamping line connected to the secondary piston is not directly supported by the secondary rod, the free end of which transmits the clamping pressure piston 5 to the clamping jaw 9, but directly without the interposition of a spring rather indirectly with the interposition of the packets on a clamping jaw. long io proportionate elastic and pressure-be-The details of the invention and the advantages thereof anspruchten piston rod 8 as well as the train are on in the following with reference to a drawing claimed in the parts 2 'and 2 α of the hollow spindle. The illustrated exemplary embodiment is explained in more detail.- the aforementioned parts have a certain elasticity Transfer upper pressure execution movable clamping jaw 9. This will make the tion. 1 with the base plate is referred to, which avoids a fixed clamping workpiece to the risk of overloading or excessive compression of the clamping of the workpiece 10. Since now, as mentioned above, the jaw la has, furthermore, an approach la, in which workpiece a spindle 2 is subsequently mounted under the chem screwable during clamping. There ao high pressure, which in practice is several tons, also carries a slide 7 covering this spindle, is still somewhat compressed, so it is provided that at one end a clamping jaw 9 extends through the interposition of the parts 8,2 'and and on the other end has a bearing plate 6, 2a an automatic elastic re-tensioning which supports the spindle neck. In the free, in the through clamping jaw 9, a loosening of the one-knife widened end 2 α of the spindle is a secondly clamped workpiece between the clamping jaws 5 and a primary piston 4 is avoided. As can be seen from the drawing, the inven- Lischen medium-filled pressure chamber 3 is present proper training the advantage of a simple and for sealing the piston or this pressure type. The mechanical-hydraulic drive part 2, Raums seals 17,18 are provided. Around a 30 2 a, 4, 5, 8 forms an exchangeable unit (hydraulic permanent sealing of this pressure chamber to ensure spindle), which can be easily done, d. H. without conversion to afford, a mechanical machine vice acting on the secondary piston 5 is in place Disc springs 16 are provided, which can be used in space 3 of the mechanical spindle, keep the medium under pressure and the two seals the mechanical spindle through the hydraulic 17 and 18 pressurize. The extended spin 35 spindle according to the invention is interchangeable. It can delende 2 α is closed by a cover 12, so in NEN mechanical ones already in operation which the primary piston 4 and one with this machine vise subsequently in the simplest permanently connected drive spindle 14 is mounted, the way in a mechanical-hydraulic clamping device can be rotated with a hand crank 15. It is to be transformed. also a torque coupling, for example a 40. The invention also enables the proper spring-loaded ball catch 13 is provided, which the spin transmission of very high hydraulic clamping forces, del 14 with the cover 12 and thus with the spin This can, for example, with a diameter del 2.2 α connects. the piston rod 8 has a clamping pressure of about 15 mm According to the invention, the spindle 2 has a longitudinal bore 2 b which extends through more than 5 tons and which is exerted on the clamping jaw 9 and in which longitudinal displacement 45 takes place. Each buckling load of the bar is supported by a piston rod 8 connected to the secondary piston 5 and subjected to high pressure Hollow spindle 2 is enclosed.
Clamping pressure directly without interposition. The present invention is applied to the clamping jaw 9 in particular for a spring assembly. 50 machine vices of the usual design Advantageously, the end 8 α of the piston rod engages in a suitable manner; tensioner can be formed. The mode of operation of this mechanical-hydraulic machine vise described above is 55 patent claims:
the following: To clamp the workpiece 10, the first mechanical-hydraulic clamping device with turning the hand crank 15, by means of the rotating one fixed and one movable clamping torque coupling 13, rotates the spindle 2, 2 a and jaws and a spindle for relative movement with it in the bearing attachment 1 α screwed. The one with 60 of these clamping jaws, with the piston rod 8 α in the free, covered by the spindle, displaces a knife-widened end of the spindle a primary so that the slide 7 in the direction of arrow A, until the and a secondary piston are arranged and the clamping jaw 9 rests on the workpiece 10. Since then the latter does not cause the displacement of the movable parts of the increased resistance, the spindle 2 cannot be rotated further, the rotation locks, in particular as a torque clutch 13, so that when the machine vice is stationary, the machine vice is concealed Spindle of the spindle 2, 2 a, when the crank 15 (2) is turned further, the tensioning device is formed, the spindle is screwed to the spindle 14 in the cover 12 and thus has a continuous longitudinal bore (2 b) and a piston rod (8) connected to the secondary piston (5) is mounted in this displaceably is, the free end (8 a) of the clamping pressure directly without the interposition of a spring assembly transfers to a clamping jaw (9). 2. Clamping device according to claim 1, characterized in that the end of the piston rod (8) into a centering hole in the movable jaw (9) or a hardened insert piece (11) engages. Documents considered: German Patent No. 970 520; French patent specification No. 1220747, 238 310; U.S. Patent No. 2,492,338. 1 sheet of drawings 809 628/1321 10.63 © Bundesdruckerei Berlin