Press tool with bistable tension mechanism

Abstract

The invention relates to a press tool for connection of a pipe and a fitting, in particular for inseparable connection, with two pivoting elements, with two actuating sections formed on the pivoting elements, with two pressing sections formed on the pivoting elements, with two carrier elements assigned to the pivoting elements, and with a bistable tension mechanism, wherein each of the pivoting elements is mounted so that it can pivot about an assigned axis of rotation, wherein the carrier elements hold the axes of rotation, wherein the inner contours of the opposing pressing sections form a receiving area and wherein the receiving area formed by the inner contours in a first closed position of the pivoting elements is narrower than in a second open position of the pivoting elements.

Claims

1. A press tool for connection of a pipe and a fitting, in particular for inseparable connection, comprising: two pivoting elements, two actuating sections formed on the pivoting elements, two opposing pressing sections formed on the pivoting elements, two carrier elements assigned to supporting the pivoting elements, and a bistable tension mechanism, wherein each of the pivoting elements is mounted so that it can pivot about an assigned a corresponding axis of rotation, wherein the carrier elements hold the axes of rotation, wherein each of the opposing pressing sections comprises an inner contour, and the inner contours of the opposing pressing sections of the two pivoting elements form a receiving area, wherein the receiving area formed by the inner contours in a first closed position of the pivoting elements is narrower than in a bistable intermediate position, wherein the receiving area formed by the inner contours in the bistable intermediate position of the pivoting elements is narrower than in a second open position of the pivoting elements, wherein between the two pivoting elements a compression spring is arranged and wherein the compression spring is configured to push the pivoting elements into each of the first closed position and the second open position starting from the bistable intermediate position.

2. The press tool according to claim 1, wherein the bistable intermediate position is set by a linear arrangement of the compression spring along a line spanning between the two axes of rotation.

3. The press tool according to claim 1, wherein the pivoting elements each have a recess to accommodate a corresponding end of the compression spring.

4. The press tool according to claim 1, wherein the pivoting elements are joined together by means of corresponding engagement means so that the pivoting movement of the two pivoting elements is essentially synchronized.

5. The press tool according to claim 2, wherein the pivoting elements each have a recess to accommodate a corresponding end of the compression spring.

6. The press tool according to claim 2, wherein the pivoting elements are joined together by means of corresponding engagement means so that the pivoting movement of the two pivoting elements is essentially synchronized.

7. The press tool according to claim 3, wherein the pivoting elements are joined together by means of corresponding engagement means so that the pivoting movement of the two pivoting elements is essentially synchronized.

8. The press tool according to claim 5, wherein the pivoting elements are joined together by means of corresponding engagement means so that the pivoting movement of the two pivoting elements is essentially synchronized.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following, the invention is explained in more detail using an embodiment, with reference to the attached drawing. The drawing shows as follows:

(2) FIG. 1 an embodiment according to the invention of a press tool in a bistable position in side view with a rectangular section in sectional view;

(3) FIG. 2 the press tool shown in FIG. 1 in a closed position in side view with a rectangular section in sectional view;

(4) FIG. 3 the press tool shown in FIG. 1 in an opened position in side view with a rectangular section in sectional view; and

(5) FIG. 4 the press tool shown in FIG. 1 in perspective view without carrier elements and showing the means for synchronization of the pivoting elements.

DETAILED DESCRIPTION OF THE INVENTION

(6) FIG. 1 shows a press tool 2 according to the invention for the inseparable connection of a pipe and a fitting with two pivoting elements 4a, 4b each with an actuating section 6a, 6b and a pressing section 8a, 8b. An area of each of the pressing sections 8a, 8b has an inner contour 10a, 10b, so that between the inner contours 10a, 10b of the opposing pressing sections 8a, 8b a receiving area 12 is formed. In the representation in FIG. 1 the receiving area 12 is shown half open. In other words, the abutting surfaces 14a, 14b of the pressing sections 8a, 8b are spaced apart.

(7) On the outer lateral surfaces of the pivoting elements 4a, 4b two carrier elements 16a, 16b are arranged, which in this example have a T-shape and of which in FIG. 1 only the front carrier element 16a can be seen. By means of drill holes 18a, 18b suitably provided on the carrier elements 16a, 16b and on the pivoting elements 4a, 4b, the pivoting elements 4a, 4b are supported by the carrier elements 16a, 16b, for example by means of a bolt so that they can pivot. In this way each pivoting element 4a, 4b is assigned an axis of rotation 20a, 20b. A further drill hole 18c on each carrier element 16a, 16b is provided for connecting the carrier element 16a, 16b and thus the press tool 2 with a power machine (not shown).

(8) Each of the pivoting elements 4a, 4b is thus supported by an axis of rotation 20a, 20b assigned about which it can pivot.

(9) An explanation of the bistable tension mechanism according to the invention is provided in the following. This tension mechanism allows the receiving area 12 formed by the inner contours 10a, 10b in a first closed position of the pivoting elements 4a, 4b shown in FIG. 2 to be narrower than in a second open position of the pivoting elements 4a, 4b shown in FIG. 3. Thus starting from the bistable intermediate position shown in FIG. 1 either the first or the second stable position can be taken.

(10) To this end, between the two pivoting elements 4a, 4b a compression spring 22 is arranged. As shown in FIG. 1, the bistable intermediate position is set by a linear arrangement of the compression spring 22 along a line between the two axes of rotation 20a, 20b. In this intermediate position, the compression spring 22 exerts the maximum compressive force on the two pivoting elements 4a, 4b, which are held in position by the axes of rotation 20a, 20b. The compression spring 22 has therefore the mechanical effort to avoid this high compressive force and deflect to the right or left in FIG. 1.

(11) Thus the compression spring 22, starting from the bistable intermediate position according to FIG. 1, can push the pivoting elements either into the first closed position according to FIG. 2 or into the second open position according to FIG. 3. This results in two stable arrangements of the two pivoting elements 4a, 4b in relation to each other, which can be used when operating the press tool 2 and simplify operation of the press tool.

(12) Each of the pivoting elements 4a, 4b also has a recess 24a, 24b each for accommodating one end of the compression spring 22, as can be seen from the rectangular partial sections of FIGS. 1 to 3 in sectional view. By means of the recesses 24a, 24b the compression spring 22 is kept stable relative to the two pivoting elements 4a, 4b, so that reliable functioning of the press tool 2 is ensured. Here, the dimensions of the recesses 24a, 24b are selected such that the ends of the springs are held without significant play, in order to reduce or even avoid increased wear from the relative movement of the ends of the compression spring 22 in the recesses 24a, 24b.

(13) FIG. 4 shows a perspective view of just the two pivoting elements 4a, 4b and the associated axes of rotation 20a, 20b. The pivoting elements 4a, 4b are joined together by corresponding engagement means 26a, 26b so that they can rotate. Here the engagement means 26a, 26b are either side of the recesses 24a, 24b, of which only recess 24b can be seen in the perspective view of FIG. 4. The engagement means 26a, 26b are designed as a rounded groove and spring connection and work together like a hinge. The compression spring 22 is not present in this representation.

(14) The design of the engagement means 26a, 26b allows the rotation or pivoting movement of the two pivoting elements 4a, 4b to be essentially synchronized. Thus neither of the two pivoting elements 4a, 4b can be rotated or pivoted independently of the respective other pivoting element 4b, 4a. This advantageously ensures that pivoting of the pivoting elements 4a, 4b can only take place such that the compression spring cannot be sheared off by a relative horizontal movement in the Figures. In this way, if for example the press tool is hit on an edge at one of the pivoting elements, or if the press tool falls down, an uncontrolled movement relative to one another and thus damage to the compression spring by shearing are avoided.