vice

Abstract

The invention relates to a clamping jaw with a jaw base part (1) which can be connected to a jaw end piece (2) which has a clamping surface (3) which can be placed against a clamping object. The clamping jaw according to the invention is characterized in that the jaw base part (1) can be connected to the jaw end piece (2) directly via a dovetail guide and devices for locking the jaw end piece in the direction of the dovetail guide.

Description

[0001] The invention relates to a vice comprising a clamping jaw with a jaw base part which can be connected to a jaw end piece which has a clamping surface which can be applied against a clamping object.

[0002] A vice with clamping jaws of this type, with a base part and interchangeable jaw end piece, is known from DD 240 859 A5. The jaw base part carrying the jaw end piece can, for example, be guided on a rail and movable by a clamping drive. Alternatively, the jaw base part is rigidly connected to a support as a fixed jaw.

[0003] In the field of jaw chucks for lathes, it is known to connect clamping jaws via a dovetail or groove guide, as can be seen, for example, from US 1 372 726 A, EP 3 623086 A1 and US 4 982 970 A.

[0004] The present invention provides a new vice with clamping jaws of the type mentioned at the outset, which is characterized in that the jaw base part can be connected to the jaw end piece directly via a dovetail guide and devices for locking the jaw end piece on the jaw base part in the direction of the dovetail guide, wherein the dovetail guide is formed by a projection on the jaw base part engaging in a recess on the jaw end piece and wherein the dovetail guide is formed on only one side of the projection and the projection can be pivoted into the engaged position by rotating the jaw end piece in a plane perpendicular to the guide direction of the dovetail guide, wherein the jaw end piece can also be acted upon in the direction of the dovetail guide by at least one pressure piece supported on the projection, which engages on the jaw end piece.

[0005] Advantageously, when a clamping force perpendicular to the dovetail guide acts on the jaw end piece, the corresponding inclined plane of the dovetail guide ensures a stable clamping of the jaw base part to the jaw end piece.

[0006] Preferably, the locking devices are arranged in the longitudinal center of the dovetail guide, in particular in an area between the jaw base part and the jaw end piece, in which the projection forming the dovetail guide is interrupted.

[0007] In one embodiment, the clamping jaw according to the invention comprises devices for automatically releasing the connection between the jaw base and jaw end piece upon impact to the jaw end piece, which devices comprise at least one element that can be destroyed and / or deformed by the impact load. In the event of a collision, damage can be limited to the destruction of this element.

[0008] In a further advantageous embodiment of the invention, the locking devices comprise a receiving element connected to the jaw base part, which forms a seat for at least one predetermined breaking element that engages in a recess in the jaw end piece in a locking manner.

[0009] The movement of clamped workpieces and / or tools within the machining area can lead to collisions between the moving parts, resulting in significant damage to the parts. By automatically releasing the connection between the jaw base and jaw end piece, such damage can be limited and restricted to a few connecting parts. In the event of a collision, the locking mechanism is released, and the jaw end piece can be moved toward the dovetail guide on the jaw base.

[0010] The invention is further explained below with reference to an embodiment and the accompanying drawings relating to this embodiment. They show: Fig. 1 a clamping jaw according to the invention in a plan view, Fig. 2 the clamping jaws of Fig. 1 in sectioned side views according to section plane AA or CC of Fig. 1, Fig. 3 an uncut, in its viewing direction the side view of Fig. 2 corresponding side view, Fig. 4 a sectioned plan view according to section plane BB of Fig. 3, and Fig. 5 and Fig. 6 a further embodiment of a clamping jaw according to the invention in sectional partial views.

[0011] A clamping jaw of a clamping device, e.g., in the manner of a vice, comprises a jaw base part 1 and a jaw end piece 2 with a clamping surface 3 for contact with an object to be clamped. The clamping jaw is guided, e.g., on a rail of a clamping device or fixed to the rail as a fixed jaw via the jaw base part 1.

[0012] A projection 4, integrally connected to the jaw base part 1, protrudes from the jaw base part 1 and engages into a recess 5 in the jaw end piece 2. The projection 4 and the recess 5 form a dovetail guide on one side. With their surfaces adjacent to the recess 5 and the projection 4, the jaw end piece 2 and the jaw base part 1 rest against each other, with the dovetail guide allowing a certain amount of play of the jaw end piece in all directions parallel to the contact surfaces.

[0013] The shoulder 4 is interrupted in the longitudinal center of the dovetail guide and between the jaw base part 1 and the jaw end piece 2 a space 6 is formed for receiving devices for locking the jaw end piece 2 on the jaw base part 1 in the direction of the dovetail guide.

[0014] In the receiving space 6, a receiving element 7 is arranged which is screwed to the jaw base part 1 and has seats for receiving predetermined breaking elements 8, 8' which lock the jaw end piece 2 in the guide direction.

[0015] In the event of a collision, the frontal shoulders 17, 18 of the receiving element 7 serve as an end stop for the displaced jaw end piece and prevent slipping, so that no damage can occur from flying parts.

[0016] At a distance from the receiving element 7, two locking elements 9, 9' are screwed to the extension 4.

[0017] To connect the jaw end piece 2 to the jaw base part 1, the jaw end piece 2 is attached to the jaw base part 1 in a pivoting movement according to arrow 10, so that the parts of the dovetail guide engage with each other and, in a final phase of the pivoting movement, the predetermined breaking elements 8, 8' engage in a locking seat on the jaw end piece 2 and the locking elements 9, 9' engage on the jaw end piece 2.

[0018] If the jaw end piece 2 is subjected to an impact load with an impact component in the direction of the dovetail guide, either under direct or indirect loading of the jaw end piece via a clamped object, the predetermined breaking elements 8, 8' are destroyed and thus the locking of the jaw end piece 2 in the direction of the dovetail guide is canceled. In such an accident, in order to restore full functionality, only the destroyed breaking elements need to be replaced with undamaged breaking elements 8.8'.

[0019] As in particular Fig. 2b, the dovetail guide ensures, in the event of an object being clamped, a self-reinforcing clamping between the jaw base part 1 and the jaw end piece 2, in that, when a clamping force 19 is applied, the jaw base part 2 is pressed against the jaw base part 1 by an inclined plane of the dovetail guide according to arrows 20, 20'. As long as no object is clamped, the locking elements 9, 9' advantageously ensure that the jaw end piece 2 is fixed perpendicular to the dovetail guide. This prevents unwanted play of the jaw end piece 2.

[0020] By using two predetermined breaking elements 8, 8', relatively high process forces can be transmitted. For lower process forces transmitted via the clamped object, the number of predetermined breaking elements used can be advantageously reduced, thus increasing the sensitivity of the shock protection.

[0021] It is understood that the locking elements 9, 9' can be spring-loaded and can engage with a ball head in corresponding locking recesses on the jaw end piece 2. Cover plates 11 keep chips and machining fluids used during machining away from the locking devices.

[0022] How Fig. As can be seen in Figure 2b, the jaw end piece 2 could also form a dovetail guide with the jaw base part 1 in a position rotated by 180° and thus the clamping jaw end piece could be reversible.

[0023] Fig. 5 and Fig. 6 show an alternative to the Fig. 4 locking elements 9,9' shown.

[0024] Instead of the spring-loaded locking elements 9,9', curved leaf springs 12 are formed, which project with one end into a recess 13 in the jaw base part 1, where they are fastened by means of a screw 14, and engage with the other end in a recess 15 in the extension 4 of the jaw base part 1.

[0025] Fig. 6 shows the leaf spring 12 in the unbent state, as it exists without the jaw end piece 2 placed on the jaw base part 1. When the jaw end piece 2 is placed on the jaw base part 1 with the pivoting movement described above, the jaw end piece strikes against a curvature 16, bending the entire leaf spring and locking behind the curvature 16.

[0026] It is understood that the leaf springs 12 could be fastened conversely to the jaw end piece 2 and the jaw end piece 2, together with the leaf springs, engages the jaw base part 1 having the extension 4.

Claims

[1] Vice comprising a clamping jaw with a jaw base part (1) which can be connected to a jaw end piece (2) which has a clamping surface (3) which can be applied against a clamping object, characterized byin that the jaw base part (1) can be connected to the jaw end piece (2) directly via a dovetail guide and a device for locking the jaw end piece (2) in the direction of the dovetail guide, the dovetail guide being formed by a projection (4) on the jaw base part (1) engaging in a recess (5) on the jaw end piece (2), the dovetail guide being formed on only one side of the projection (4) and the projection (4) being able to be pivoted into the engagement position by rotating the jaw end piece (2) in a pivoting plane perpendicular to the dovetail guide, and in that the jaw end piece (2) can be acted upon in the direction of the dovetail guide by at least one pressure piece (9, 9') supported on the projection (4) and latching onto the jaw end piece (2). [2] Vice according to claim 1, characterized by that the locking devices are arranged in the longitudinal center of the dovetail guide. [3] Vice according to one of claims 1 or 2, characterized by that the locking devices are arranged in an area (6) between the jaw base part (1) and the jaw end piece (2), in which the projection (4) is interrupted. [4] Vice according to one of claims 1 to 3, characterized by Devices for automatically releasing the connection when the jaw end piece (2) is subjected to shock load. [5] Vice according to claim 4, characterized by that the devices comprise at least one element (8, 8') which can be destroyed and / or deformed by the impact load. [6] Vice according to one of claims 1 to 5, characterized by that the locking devices comprise a receiving element (7) connected to the jaw base part (1), which forms at least one seat for a predetermined breaking element (8, 8') engaging in a recess in the jaw end piece (2) in a locking manner. [7] Vice according to claim 1, characterized bythat the pressure piece is formed by a curved leaf spring (12) connected to the jaw base part (1) or the jaw end piece (2). [8] Vice according to one of claims 1 to 7, characterized by that the recess receiving the projection (4) is closed, in particular by cover plates (11).

Images