DE202018102253U1 - Device for clamping workpieces - Google Patents

Abstract

Device for clamping workpieces with a lever-shaped clamping element (2), which is mounted pivotably between a basic position and a clamping position, wherein the clamping element (2) a front, in clamping position a workpiece (3) acted upon end (2a) and a rear end ( 2b) which is adjustable from the basic position into the clamping position by a piston / cylinder unit (12) pressurized with fluid, characterized in that the rear end (2b) of the clamping element (2) loosely rests on the piston (13) of the piston / cylinder unit. Cylinder unit (12) rests.

Description

The invention relates to a device for clamping workpieces with a lever-shaped clamping element, which is mounted pivotably between a basic position and a clamping position, wherein the clamping element has a front, in the clamping position a workpiece beaufschlagendes end and a rear end which of a pressure-medium-loaded piston / Cylinder unit is adjustable from the basic position to the clamping position.

Devices of this type are well known. With such devices, workpieces are held on a base so that they can usually be processed, e.g. drilled, cut, stamped, milled, welded or the like

Out DE 10 2011 018 205 B3 a device for clamping workpieces with a clamping element is known, which is adjustable between a basic position and a clamping position, wherein the clamping device comprises a pressure medium-loaded piston which serves to adjust the clamping element which presses on the workpiece. Furthermore, the clamping device has a housing in which the pressure-medium-loaded piston is guided. The clamping element is connected via first tabs to the housing and second tabs in such a way with the piston, that a positive guidance of the clamping element results and the clamping element is guided by the piston during the adjustment thereof in a pushing movement over the workpiece and in the following a rotational movement performs a bolt, to which the clamping element is connected by a bolt movable with the tabs and these are movably connected to the housing. The piston is movably connected by means of one of the second tabs with the first tabs and a further tab with the clamping element. This clamping device should be suitable for clamping workpieces of different shapes, but requires a variety of components and is therefore expensive.

The object of the invention is to provide a device for clamping workpieces, which is simple in construction and can be easily adapted to different workpiece shapes and sizes.

This object is achieved in a device of the type described according to the invention in that the rear end of the clamping element rests loosely on the piston of the piston / cylinder unit.

In contrast to the prior art thus the rear end of the clamping element is not pivotable and possibly slidably connected to the piston / cylinder unit, but is only loosely on the piston of the piston / cylinder unit. It thus eliminates all kinematic fasteners between the piston and the clamping element, which greatly simplifies the construction of the device. In addition, since there is no connection between the piston and the clamping element, it is possible in a simple manner to replace the clamping element against a differently shaped clamping element in order to make an adaptation to different workpiece shapes and sizes.

For this purpose, it is provided in a preferred embodiment that the clamping element is mounted between two tabs on a releasably inserted into the two tabs bearing pin. The lever-shaped clamping element is thus mounted between two tabs forming a fork and can be replaced by simply removing the bearing pin.

In order to make the removal and securing of the bearing pin particularly simple, it is preferably provided that the bearing pin is releasably held by means of a plug fuse to a tab.

According to a first embodiment, it is provided that the piston / cylinder unit is hydraulically pressurized. This embodiment is preferred if a hydraulic medium is available at the place of use.

Alternatively, it is provided according to a second embodiment, that the piston / cylinder unit is pneumatically pressurized. A compressed air source is available in most locations.

In a further preferred embodiment, it is provided that the piston / cylinder unit has a short-stroke cylinder and is arranged on a base plate. Such a short-stroke cylinder requires only a small size, so that the device is compact.

At the aforementioned bottom plate on which the piston / cylinder unit is arranged, the two tabs are preferably attached.

The bottom plate preferably has recesses for connecting to a superordinate device. Thus, the device can be easily screwed to a machine table or the like.

The invention also relates to a clamping system with a device described above and a plurality of geometrically differently shaped lever-shaped clamping elements. Depending on the workpiece size and shape then the respectively suitable lever-shaped clamping element can be selected and used.

• 1 eine perspektivische Darstellung der Vorrichtung mit einem ersten Spannelement,
• 2 eine perspektivische Explosionsdarstellung der Vorrichtung nach 1,
• 3 eine Seitenansicht der Vorrichtung nach 1,
• 4 eine Seitenansicht der Vorrichtung mit einem zweiten Spannelement,
• 5 eine Draufsicht auf die Vorrichtung nach 4 und
• 6 eine Seitenansicht der Vorrichtung nach 4 mit angedeutetem, eingespannten Werkstück.

The invention is explained in more detail below by way of example with reference to the drawing. This shows in

• 1 a perspective view of the device with a first clamping element,
• 2 an exploded perspective view of the device according to 1 .
• 3 a side view of the device according to 1 .
• 4 a side view of the device with a second clamping element,
• 5 a plan view of the device according to 4 and
• 6 a side view of the device according to 4 with indicated, clamped workpiece.

A device for clamping workpieces is generally designated 1 in the figures. This device 1 has a lever-shaped clamping element 2 with a front, in clamping position a workpiece 3 impinging end 2a and a rear end 2 B on. The one at the front end 2a adjacent area of the clamping element 2 can be geometrically designed differently in the 1 . 2 and 3 is a first embodiment and in the 4 . 5 and 6 a second embodiment is shown. In a medium, thickened area 2c is the tension element 2 with a cross hole 4 for receiving a bearing pin 5 Provided. This bearing bolt 5 has a thickened head area at one end 5a with one opposite the diameter of the transverse bore 4 larger diameter and at one end a circumferential groove 5b on.

The clamping element is between two tabs 6 . 7 releasably inserted and stored. For this purpose, the two tabs 6 . 7 one of the transverse holes 4 corresponding transverse bore 6a . 7a on. These two tabs 6 . 7 form a fork bridge and are on the underside of a base plate 8th the device 1 attached.

How best 2 shows, the respective clamping element 2 between the two tabs 5 . 6 introduced so that the cross holes 4 . 6a and 7a aligned with each other. Subsequently, the bearing pin 5 plugged in and on the other side with a clip-type fuse 9 secured, the releasable in the circumferential groove 5b of the bearing bolt 5 intervenes.

By simply loosening the plug-in fuse 9 and pulling out the bearing pin 5 can thus the clamping element 2 taken out and by another tensioning element 2 be replaced, which simplifies the device 1 can be adapted to different workpiece shapes by correspondingly different geometrically shaped clamping elements 2 be used.

Adjacent to the two flaps 6 . 7 has the base plate 8th the device has two recesses 10 . 11 on, which are preferably designed slot-like and an attachment of the device 1 at a machine table, not shown, od. Like. Allow a parent device.

Another essential component of the device 1 is a preferably designed as a short-stroke cylinder piston / cylinder unit 12 which are below the rear end 2 B of the clamping element on the bottom plate 8th is attached. At the top protrudes from the piston / cylinder unit 12 a piston 13 , preferably with a stop pin 14 , out, the stop pin 14 and thus the piston end 13 is loosely at the rear end 2 B of the lever-shaped tensioning element 2 or vice versa, the rear end 2 B of the clamping element 2 lies loosely on the piston 13 the piston / cylinder unit 12 on. By pressurizing the piston 13 becomes the front end 2a of the clamping element 2 clamped on the workpiece 3 pressed. To release the clamping element 2 Accordingly, the pressurization of the piston 13 completed.

The device 1 is recognizable only from very few items and has a very compact design. Due to the simple interchangeability of the clamping element 2 is by selecting a suitably trained clamping element 2 in a simple way an adaptation to the shape and size of the respective workpiece 3 possible.

LIST OF REFERENCE NUMBERS

1

device

2

clamping element

2a

front clamping element end

2 B

rear clamping element end

2c

middle area

3

workpiece

4

cross hole

5

bearing bolt

5a

head area

5b

circumferential groove

6, 7

flap

6a, 7a

cross hole

8th

baseplate

9

plug fuse

10, 11

recess

12

Piston / cylinder unit

13

piston

14

stop pin

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102011018205 B3 [0003]

Claims (9)

Device for clamping workpieces with a lever-shaped clamping element (2), which is mounted pivotably between a basic position and a clamping position, wherein the clamping element (2) a front, in clamping position a workpiece (3) acted upon end (2a) and a rear end ( 2b), which is adjustable from the basic position into the clamping position by a piston / cylinder unit (12) pressurized with fluid, characterized in that the rear end (2b) of the clamping element (2) loosely on the piston (13) of the piston / Cylinder unit (12) rests. Device after Claim 1 , characterized in that the clamping element (2) between two tabs (6,7) on one in the two tabs (6,7) releasably inserted bearing pin (5) is mounted. Device after Claim 2 , characterized in that the bearing pin (5) by means of a plug-in fuse (9) on a tab (6,7) is releasably held. Device according to one or more of Claims 1 to 3 , characterized in that the piston / cylinder unit (12) is hydraulically pressurized. Device according to one or more of Claims 1 to 3 , characterized in that the piston / cylinder unit (12) is pneumatically pressurized. Device according to one or more of Claims 1 to 5 , characterized in that the piston / cylinder unit (12) has a Kurzhubzylinder and on a bottom plate (8) is arranged. Device according to one or more of Claims 1 to 6 , characterized in that the two tabs (6,7) are fixed to the bottom plate (8). Device after Claim 6 or 7 , characterized in that the bottom plate (8) has recesses (10,11) for connection to a superordinate device. Clamping system with a device (1) according to one or more of Claims 1 to 8th and a plurality of geometrically differently shaped lever-shaped clamping elements (2).

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