Press tool with a fixing unit

Abstract

A hydraulically actuated pressing tool (20) comprising a first pressing unit (21) and a second pressing unit (22) is proposed, wherein the first pressing unit (21) and the second pressing unit (22) are movable towards each other along a common longitudinal axis (X) by at least one hydraulically actuated cylinder-piston unit. The first pressing unit (21) and the second pressing unit (22) each define a free space (35). The pressing tool (20) has at least one fixing unit (33L, 33R) which has a locking pawl (33.1) that can be pivoted in and out of the free space (35) about an axis (33.2).

Description

[0001] The invention relates to a hydraulically actuated pressing tool for producing a connection between two pipes.

[0002] It is known to connect pipes using a press fitting. The press fitting comprises a fitting body, a first press ring, and a second press ring. Such a fitting body is designed as a connecting piece so that the pipe ends of the pipes to be connected can be accommodated by the fitting body. The press rings are pressed onto the fitting body at the opposite end areas of the fitting body in such a way that the press rings press the fitting body radially inward against the outer wall of the pipes. The press rings are pressed axially onto the fitting body. This creates a force-locking connection between the fitting body and the pipe ends.

[0003] Hydraulically operated pressing tools are known for forming such a connection. EP 2 749 378 A1 discloses a hydraulically operated pressing tool. The pressing tool has half-shell-shaped pressing units that fold around the press fitting and are locked together. The pressing process can then be carried out. A cylinder-piston unit is provided to apply the necessary force, which uses hydraulic pressure to move the pressing units toward each other in an axial direction.

[0004] However, these pressing tools, which work quite satisfactorily, have the disadvantage that in confined spaces, especially when it comes to connecting pipes that are positioned next to or on top of each other, the available space is in most cases not sufficient to apply the half-shells to the pipe ends.

[0005] A hydraulic pressing tool is known from US Pat. No. 5,305,510 A. This hydraulic pressing tool has a first pressing unit and a second pressing unit, wherein the first pressing unit and the second pressing unit are movable in the axial direction so that these pressing units can apply press rings to a fitting body. Each pressing unit has a free space with an open passage area into which the press fitting can be inserted. A fixing unit is provided by which the pressing tool can be fixed in the pipe or on the press fitting. The fixing unit comprises fixing elements in the form of webs that can be moved tangentially to the pipe or fitting. To release the fixing unit, access to the fixing elements is necessary from above when the pipe is arranged horizontally and the pressing tool has been positioned on the pipe from below.

[0006] Based on this, the present invention is based on the objective of simplifying the handling of a hydraulically actuated pressing tool.

[0007] This object is achieved according to the invention by a hydraulic pressing tool having the features of claim 1. Advantageous further developments and embodiments of the hydraulic pressing tool according to the invention are the subject of the dependent claims.

[0008] The hydraulic pressing tool according to the invention comprises a first pressing unit and a second pressing unit. To perform a pressing process, the first pressing unit and the second pressing unit can be moved toward one another along a common longitudinal axis by at least one hydraulically actuated cylinder-piston unit. The first pressing unit and the second pressing unit each define a free space that is suitable and intended to at least partially accommodate the pipe ends to be connected and the press fitting. The hydraulic pressing tool according to the invention comprises at least one fixing unit that has a locking pawl that can be pivoted in and out of the free space about an axis.

[0009] Because the fixing unit has a locking pawl that can be pivoted in and out around an axis into the free space, relatively precise positioning of the pressing tool can be achieved essentially automatically. No additional handling or actions are required to move the fixing unit from its initial position for positioning the pressing tool to its locking position after the pressing tool has been positioned on the press fitting.

[0010] During positioning of the pressing tool on the press fitting, the pressing tool is essentially positioned in relation to the press fitting and pipe so that the latter's clearance is aligned with them. If the press fitting and / or pipes are partially in the clearance, they will come into contact with the locking pawl. This can be considered a pre-positioning of the tool. Improper positioning of the pressing tool does not result in a functional impairment of the fixing unit.

[0011] Because the locking pawl is pivotable, only minimal frictional forces occur between the fixing unit and the press fitting or pipes during the positioning process. The influence of the environment, especially dust, is less than with the conventional solution.

[0012] According to an advantageous development of the pressing tool, it is proposed that the free space has an open passage area, and that the locking pawl can be pivoted in and out of the passage area. This design of the pressing tool has the advantage that the pressing tool can be used even in tight spaces, which can be particularly common when two pipes run parallel to each other. A compact design of the pressing tool is achieved. This also means that the fixing unit eliminates the need for additional space for the pressing tool.

[0013] The accessibility of the fixing unit is also advantageously solved so that the pressing tool can be positioned even in tight conditions, especially when a press connection is to be made in a double pipe arrangement.

[0014] The design of the pressing tool according to the invention also has the advantage that several different design options can be created for releasing the fixation, so that the pressing tool has a preferred solution depending on the main purpose, in particular such that the fixation can be released from one side.

[0015] A particularly preferred embodiment of the pressing tool is one in which the locking pawl can be pivoted inward against a spring force. This also means that no additional measures are necessary to reach the operating position of the hydraulic pressing tool. Once the pressing tool is positioned, the locking pawl is pivoted inward against the spring force. Once the pressing tool has reached the specified position, the spring force pivots the locking pawl outward, securing the pressing tool in place.

[0016] Particularly preferred is an embodiment in which the locking pawl can be pivoted in against a spring force of a leg spring.

[0017] To further reduce the overall height of the hydraulically operated pressing tool, it is proposed that the locking pawl can be pivoted about an axis running parallel to the longitudinal axis.

[0018] For safe handling of the pressing tool, according to a further advantageous embodiment of the pressing tool, it is proposed that a limiting means is provided by which the pivoting angle of the locking pawl into the free space is limited.

[0019] A limitation of the pivoting angle is preferably achieved in that the locking pawl has an extension which interacts with the limiting means.

[0020] Preferably, the limiting means is pin-shaped.

[0021] According to a further preferred embodiment, it is proposed that the limiting means is formed by a wall section of an insert, wherein the insert is detachably connected to a pressing unit.

[0022] The locking pawl, the extension, and the limiting device preferably form a single unit with an insert of a press unit. Different inserts are used for different press fitting geometries. The shape and thus the geometry of the locking pawl can also be adapted to the different geometries of the press fittings.

[0023] According to a further advantageous embodiment of the pressing tool according to the invention, it is proposed that the locking pawl be lockable in a pivoted-out position. The pivoted-out position of the locking pawl is the position in which the pressing process can be carried out. To release the locking pawl from the pivoted-out position, a release unit is provided, which interacts directly or indirectly with the locking pawl.

[0024] A particularly preferred embodiment is one in which the trigger unit has an actuating rod with a button at one end and a preferably wedge-shaped element at the opposite end. The actuating rod extends through a holder arranged on the pressing tool. A spring, in particular a compression spring, is arranged between the holder and the button, with the element being operatively connected to the extension. The holder can also form a stop for the preferably wedge-shaped element.

[0025] The fixing unit and the release unit interacting with the fixing unit are designed such that the fixing unit is essentially automatically locked, at least during the pressing process. In particular, it is therefore proposed that the fixing unit have a locking pawl which, in an active position, i.e., in a position in which the locking pawl rests against the press fitting, the angle between the direction of action of the force from the press fitting to the locking pawl and the direction of movement of the contact zone between these two elements upon actuation of the fixing element in the direction of the "open position" is greater than 45°, preferably greater than the arc cotangent of the friction coefficient of the two surfaces in this contact zone, more preferably almost perpendicular. In particular, the principle of self-locking is implemented here, which enables holding forces that are significantly higher than the restoring force of the leg spring.

[0026] A particularly preferred structural design for this purpose is a fixing unit in which the direction of action of the normal force from the press fitting to the locking pawl runs through the area of ​​the axis around which the locking pawl rotates.

[0027] Further details and advantages of the invention are explained with reference to the embodiment shown in the drawing. They show: Fig. 1: a hydraulic pressing tool for pressing a press fitting in a perspective view, Fig. 2: the pressing tool according to Fig. 1 in a top view, Fig. 3: the pressing tool according to Fig. 1 in a sectional view along the section line AA to Fig. 2 , in another position Fig. 4: the pressing tool after Fig. 1 in a sectional view along the section line AA to Fig. 2 , in another position, Fig. 5: the pressing tool after Fig. 1 in a sectional view along the section line AA to Fig. 2 , in an operating position, Fig. 6: a detailed view of Fig. 5 , Fig. 7: the pressing tool in a detailed view comparable Fig. 5 in a further position, Fig. 8: an alternative design of a pivoting limitation of the pawl Fig. 9: the pressing tool in a plan view with cut-outs, Fig. 10: a variant of the arrangement of a pawl, Fig. 11: the variant of the arrangement of a pawl with a cover according to Fig. 10 in a step section of this cover, Fig. 12: the pressing tool with an arrangement of a pair of pipes.

[0028] Fig. 1 shows a hydraulic pressing tool 20 for pressing a press fitting 10 in a perspective view.

[0029] The press fitting 10 comprises a fitting body 15, a first press ring 11, and a second press ring 12. The press fitting 10 can be used to connect two pipes, a first pipe 13 and a second pipe 14, by receiving the corresponding pipe ends in the fitting body 15 and fixing the fitting body 15 to the pipe ends with the first press ring 11 and the second press ring 12. The first press ring 11 can be pressed axially onto the fitting body 15 along a first pressing direction A. The second press ring 12 can be pressed axially onto the fitting body 15 along a second pressing direction B. As a result, the press rings, the first press ring 11 and the second press ring 12, are held force-fittingly on the fitting body 15, which in turn holds the fitting body 15 on the pipe ends. As a result, a connection between the first pipe 13 and the second pipe 14 is connected to one another via the press fitting 10.

[0030] The hydraulically actuated pressing tool 20 is provided to form the connection by means of the press fitting 10. The pressing tool 20 comprises a first pressing unit 21 and a second pressing unit 22. The first pressing unit 21 and the second pressing unit 22 are connected to each other by hydraulic pistons 23L and 23R. The hydraulic pistons 23L, 23R are designed here as piston rods with attached hydraulic pistons, with sealing and guide elements (not shown). In addition to the function of "applying pressing force," they also perform the functions of "connecting parts to each other and guiding them linearly toward each other." Alternatively, the use of pure pressure pistons without piston rods would also be conceivable, preferably in combination with linear guide elements running parallel to them, similar to that described in EP 2 749 378 A1.

[0031] The hydraulic pistons 23L and 23R are arranged parallel to each other. The arrangement of the hydraulic pistons 23L and 23L is such that they are also parallel to a longitudinal axis X of the tubes 13, 14. At this point, it should be noted that the longitudinal axis of the first tube 13 and the longitudinal axis of the second tube 14 have a common longitudinal axis, which in the Fig. 1 designated by X. The fitting body 15 as well as the first press ring 11 and the second press ring 12 are arranged coaxially with the first pipe 13 and the second pipe 14.

[0032] In the illustrated embodiment, the piston rods of the hydraulic pistons 23L and 23R are rigidly connected to the second press unit 22.

[0033] The hydraulic pistons 23L and 23R are parts of a cylinder-piston unit attached to the first press unit 21, as shown in Fig. 9 is evident, and its functionality will be discussed below.

[0034] From the Fig. 1 It can be seen that a first, replaceable insert 31 is attached to the first pressing unit 21. In the illustrated embodiment, the first insert 31 is essentially Z-shaped in cross section, with an axial effective surface 31.1 ( Fig. 2 ) for transmitting the pressing forces into the end face of the first pressing ring 11 and radial active surfaces 31.2 for holding the weight forces via the outer surface of the first pressing ring 11.

[0035] The second pressing unit 22 has a second insert 32. The second insert 32 is preferably L-shaped, with an axial effective surface 32.1 ( Fig. 2 ) for transmitting the pressing forces into the end face of the second pressing ring 12 and radial active surfaces 32.2 for holding the weight forces via the outer surface of the second pressing ring 12.

[0036] To handle the pressing tool 20, in the preferred embodiment, it has two handles 24L and 24R connected to the first pressing unit 21. The handles 24L and 24R have a substantially circular cross-section. They are arranged parallel to the hydraulic pistons 23L and 23R.

[0037] In the preferred embodiment according to Fig. 1 the first pressing unit 21 has two opposing fixing units 33L and 33R, by which the pressing tool 20 is fixed to the first pressing ring 11.

[0038] From the top view Fig. 2 of the pressing tool 20, it can be seen that both the first fixing unit 33L and the second fixing unit 33R each have a locking pawl 33.1 which bears against the first pressing ring 11 when the pressing tool 20 is in an operating state, that is to say in a state in which the pressing process is carried out, and the weight of the pressing tool 20 hangs on these locking pawls 33.1.

[0039] Fig. 3 bis Fig. 5 show how the pressing tool 20 is placed on the pipe 10, in sectional views along the section line AA to Fig. 2 .

[0040] The first of these sectional views ( Fig. 3 ) shows a situation in which the pressing tool 20 is not yet in the operating state. This means that in this state, the pressing tool 20 is not yet arranged on the pipes 13, 14 and / or the press fitting 10.

[0041] The representation according to Fig. 3 shows that the first insert 31 defines a substantially U-shaped free space 35. The free space 35 has an open passage area 35.1. The open passage area 35.1 is defined by parallel edges of the first insert 31. Referring to the Fig. 2 It can be seen that the clear width of the passage area 35.1 corresponds to the diameter of the first tube or is slightly larger. Adjacent to the passage area 35.1 is a circular receiving area 35.2. The receiving area 35.2 has a radius that corresponds to the outer radius of the first tube or is slightly larger. The first and second fixing units 33L and 33R are arranged in the area of ​​the passage area 35.1. From the illustration according to Fig. 3 It can be seen that the respective pawl 33.1 is in a starting position and projects into the passage area 35.1.

[0042] To position the pressing tool 20 on the arrangement comprising the first pipe 13, the second pipe 14, the fitting body 15, the first pressing ring 11 and the second pressing ring 12, the pressing tool 20 is moved in the direction of arrow C to Fig. 3 An intermediate situation is in the Fig. 4 During the positioning of the pressing tool 20, the locking pawls 33.1 come into contact with the outer surface of the first pressing ring 11. Upon further displacement of the pressing tool 20 in the direction of the Fig. 4 shown arrows in the direction of arrow C, here upwards, the pawls 33.1 are moved according to the rotation arrows F against the spring force of the leg springs 34 ( Fig. 6 ) is pivoted. The positioning process of the pressing tool 20 on the arrangement can be considered completed when the first pressing ring 11 has reached its position in the first insert 31 and the second pressing ring 12 has reached its position in the second insert 32. This situation is in the Fig. 5 shown, whereby only the situation at the first press ring 11 is shown here.

[0043] From the Fig. 5 It can be seen that the pressing tool 20 is positioned. The press fitting 10 with the attached pipes 13,14 is located in the receiving area 35.2 ( Fig. 3 ) and the first insert 31 lies with its radial effective surfaces 31.2 ( Fig. 2 ) in the area of ​​the outer surface of the first pressing ring 11. The locking pawls 33.1 are pushed into the passage area 35.1 ( Fig. 3 ) and rest with their end faces on the outer surface of the first pressing ring 11.

[0044] Fig. 6 shows in a detailed view of Fig. 5 A preferred embodiment of the fixing unit. The fixing unit has a locking pawl 33.1, which is pivotable about an axis 33.2. The locking pawl 33.1 has a stop 33.3. In the illustrated embodiment, the first insert 31 is provided with a stop 33.4. The stops 33.3 and 33.4, here designed as cylindrical pins, pressed into the respective parts 31, 33.1, serve as abutments for the respective leg of a leg spring 34, wherein the coils of the leg spring 34 form the axes 33.2, here preferably used as fastening elements 36 ( Fig. 10 ) and designed as a cylindrical pin.

[0045] The locking pawl 33.1 has an extension 33.5 that extends away from the axis 33.2 in a predominantly lateral horizontal direction toward the handles 24R, 24L. The axis 33.2 lies approximately in the center of the fixing element formed by the locking pawl 33.1 and the extension 33.5. In the preferred embodiment, the free end of the extension 33.5 is arcuate and arranged such that the fixing unit can be released again by a force FA in a predominantly horizontal direction BE.

[0046] The pivoting angle of the pawl 33.1 into the free space 35 ( Fig. 3 ) is limited by a limiting means 33.6, which interacts with the extension 33.5 of the pawl 33.1, here designed as a cylindrical pin, pressed into the first insert 31. Fig. 6 further shows the individual elements 42-48 of the right-hand trigger unit 41R. The trigger unit 41R has a holder 46. The holder 46 has a through-bore through which an actuating rod 45 extends. The actuating rod 45 has a preferably wedge-shaped element 43 at one end, which partially rests against the end face of the extension 33.5.

[0047] To release the fixation, a button 44 is provided at the end of the actuating rod 45 opposite the element 43. A return element 42, here designed as a compression spring, is provided between the stop 46 and the button 44. The locking pawl 33.1 is released when a user presses the button 44, as shown in the Fig. 7 The linear movement of element 43 is converted into a pivoting movement of the locking pawl 33.1, so that the locking pawl 33.1 is pivoted out of the free space and the pressing tool is released.

[0048] The actuating rod 45, the button 44, the holder 46, the return element 42 and the element 43 can also form an arrangement by which the locking pawl 33.1 can be held in a locking position on the one hand and the locking pawl 33.1 can be pivoted from the locking position into a release position on the other hand.

[0049] The right-hand trigger unit 41R shown here is designed as a separate subassembly, which is attached to the first press unit 21 by means of screws (not shown). Alternatively, an integral design is also possible, preferably with the holder 46 and the stop 47 for the reset element 42 integrated as features in the main part of the press unit 21.

[0050] This preferred arrangement allows the buttons to be located directly near the handles 24R and 24L, improving ergonomics. Furthermore, the trigger units 41R and 41L only need to be present once, rather than repeatedly in each insert 31 and 32 for the different sizes.

[0051] Fig. 8 shows a variant in which the preferably wedge-shaped element 43 partially rests against the end face of the extension 33.5. The configuration of the element 43 and the end face of the extension 33.5 in conjunction with the holder 46 ensures that the locking pawl 33.1 is not pivoted by the weight of the pressing tool in such a way that the locking pawl 33.1 is pivoted out of its fixed position. Thus, in this configuration, no independent limiting means 33.6 ( Fig. 7, 8 ), necessary.

[0052] The Fig. 1, Fig. 2 , Fig. 5 and Fig. 6 show a situation in which the locking pawl 33.1 is in the locking position. Once the locking pawl has reached this position, the pressing process can be carried out. A cylinder-piston unit is provided for carrying out the pressing process, as shown in the Fig. 9 The pressing tool can have two such hydraulic pistons 23L and 23R.

[0053] From the Fig. 9 A hydraulic piston 23L is visible, with a free end of a piston rod of the hydraulic piston 23L being firmly connected to the second pressing unit 22. The same applies to the second hydraulic piston 23R (not visible, dashed line). Not shown in the Fig. 9 corresponding seals, through which the cylinder chamber in which the hydraulic piston 23L is located and into which the piston rod protrudes, as well as the access holes for the hydraulic oil and the hose connection to the pump, are sealed fluid-tight.

[0054] On the side of the cylinder free from hydraulic oil, a compression spring 25L is provided between a recess in the cylinder wall and the hydraulic piston 23L. When the piston is pressurized with fluid, the hydraulic piston 23L moves in the direction of arrow A. The first pressing unit 21 and the second pressing unit 22 move towards each other in the axial direction. The first insert 31 and the second insert 32 rest against the respective pressing ring 11 and 12, respectively. As the pressing units 21, 22 move towards each other, the pressing rings 11, 12 are pushed onto the fitting body 15, causing a radial deformation of the fitting 15 and connecting the pipes, the first pipe 13 and the second pipe 14, to one another. During this process, the compression spring 25L is compressed within the cylinder by the piston. Once the pressing process is complete, the pressure in the piston-cylinder unit is reduced.This is accompanied by a relaxation of the compression springs 25L, 25R, so that the first and second pressing units 21, 22 return to their starting positions. The pressing process is now complete. Also visible in . Fig. 9 The fastening elements 26 for securing the inserts 31, 32 in the two parts 21, 22 are designed here as cylinder head screws. The inserts 31, 32 are replaceable. They are adapted to the press fitting. Not visible in Fig. 9 The compression spring 25R is responsible for the return movement of the hydraulic piston 23R. The position of the compression spring 25R is indicated by a dashed line. Gas springs are also possible as an alternative or in addition to the classic compression springs 25L and 25R shown here.

[0055] Even after the pressing process, the pressing tool remains connected to the pressed parts. To release or remove the pressing tool, press button 44 ( Fig. 6 ) a force is exerted so that the actuating rod 45 and the element 43 attached to it are displaced in the direction of the locking pawl 33.1. With this displacement, the element 43 is pressed against the end face of the extension 33.5. Due to the geometric configuration of the extension 33.5 and the element 43, the locking pawl 33.1 and also the extension 33.5 are pivoted about the axis 33.2. In the process, the locking pawl 33.1 pivots away from the pressing ring. This also means that the locking pawl 33.1 is moved out of the passage area 35.1. The locking pawls 33.1 release the pressing ring. The pressing tool 20 can be removed. If the buttons 44 are released, the locking pawls 33.1 move into the positions shown in the Fig. 3 The return movement of the button 44 is supported by a return element 42, which is arranged between the stop 47 on the holder 46 and the stop 48 on the button 44. The return element 42 is designed here as a compression spring.

[0056] In the Figuren 6, 7 und 8 A resulting force direction FK of the holding force in the contact area between the press fitting 10 and the fixing unit 33R is shown. The resulting force FK runs through the longitudinal axis X. The axis 33.2 of the fixing unit 33R is positioned in the first insert 31 such that the force direction FK also runs through it. Thus, in the contact area, the direction of movement BK is perpendicular to the force direction FK. For this reason, the leg spring 34 essentially does not have to absorb any holding forces and can be dimensioned accordingly weakly and thus compactly.

[0057] To release the fixing unit 33R, a release force FA is applied ( Fig. 7, 8 ), which generates a movement in this area in the direction of arrow BA. This causes the fixing unit 33R to rotate about the axis 33.2; counter to the restoring moment of the leg spring 34. Due to this rotation, the fixing element 33R moves in the contact area in the direction of arrow BK, which leads to the fixing unit 33R being released from the press fitting 10. The direction of the release force FA is largely horizontal. The release force FA can be applied either directly by the user or with the aid of the release unit 41R.

[0058] The Fig. 10 und 11 show a variant of the arrangement of the pawl 33.1 in connection with a first insert 31 of a first pressing unit 21. From the illustration according to Fig. 10 It can be seen that the first insert 31 has a recess that projects into the pawl 33.1. The pawl 33.1 is rotatably mounted about the axis 33.2 by means of a fastening means 36, here designed as a cylindrical pin. This fastening means 36 also defines the position for the coils of the leg spring 34. The axis 33.2 of the pawl 33.1 is formed by this fastening means 36, which additionally projects into an opposite cover 37 to improve rigidity. By positioning the pawl 33.1 between the cover 37 and the first insert 31, the position of the pawl 33.1 in the axial direction is defined. The cover 37 also protects against the ingress of dirt. A corresponding recess is also provided in the cover 37, so that a substantially flat cover of the pawl 33.1 is achieved and the stop 33.4 for the first abutment of the leg spring 34 is created.The second stop 33.3 for the second abutment of the leg spring 34 in the area of ​​the locking pawl 33.1 is designed as a pin with a transverse bore. To further increase stability, the cover 37 is additionally fastened to the first insert 31 with a screw 38. Reference numeral 33.6 designates the limiting means by which the locking pawl 33.1 cannot pivot into the free space 35 (Fig. Fig. 3 ). Reference numeral 33.7 denotes a further limiting means, which also limits excessive pivoting of the locking pawl 33.1 in the opposite direction. Both limiting means are designed as wall sections of the first insert 31.

[0059] The pressing tool according to the invention has numerous advantages. Fig. 12 An arrangement of a pipe pair with another pipe pair 16 is visible. The distance dZ between the pipes is relatively small. It has been found that in practice, the distance dZ between such pipe pairs is only a few millimeters. The pressing tool according to the invention is particularly suitable for designing or forming press connections because it requires relatively little space. It is therefore possible to create press connections for pipe pairs that are located close together.

[0060] The design of the fixing unit is relatively simple and mechanically less prone to failure. The mechanism described here, with a swivel joint, exhibits significantly lower friction losses and is less susceptible to contamination. It also provides an ergonomic way to release the pressing tool. In particular, the preferred embodiment of the pressing tool allows it to be held reliably with four fingers of each hand simultaneously, and the release can be performed with one finger per hand.

[0061] The locking unit is automatically activated when the pressing tool is positioned. No additional handling or actions are required to move the locking unit from its initial position for positioning the pressing tool to its locking position after the pressing tool is positioned on the fitting.

[0062] The fixing unit is preferably arranged on an insert of the press unit. Depending on the geometric dimensions of the pipe, particularly the outer diameter of the pipe, differently dimensioned fittings and press rings are used. The inserts, adapted to the dimensions of the press rings and fittings, are used to create secure press connections. The fixing unit can be adapted accordingly to the geometric conditions, particularly the press ring.

[0063] Because the fixing unit fixes the pressing tool in a specific position, the effort is reduced and handling of the pressing tool is made easier for the operator, especially during the pressing process.

[0064] Preferably, two oppositely arranged fixing units are provided on the pressing unit. A plurality of fixing units, especially in a symmetrical arrangement, increases the positioning accuracy of the pressing tool. Bezugszeichenliste

[0065] 10Press fitting 11First press ring 12Second press ring 13First pipe 14Second pipe 15Fitting body 16Further pipe pair 20Pressing tool 21First pressing unit 22Second pressing unit 23L, 23RHydraulic piston 24L, 24RGrips 25L, 25RCompression spring 26Fastener 31First insert 32Second insert 31.1, 32.1Axial effective area 31.2, 32.2Radial effective area 33L, 33RFixing unit 33.1Pawl 33.2Axis 33.3Stop 33.4Stop 33.5Extension 33.6; 33.7Limiting device 34Leg spring 35Free space 35.1Passage 35.2Receiving area 36Fasteners 37Cover 38Screw 41R, 41LTrip unit 45Operating rod 43Element 44Button 42Reset element 46Holder 47, 48Stop A-ASection line A, BPressing direction XLongitudinal axis CParrow direction DRangement arrow dZDistance FA, FKForce direction BA, BE, BKMovement direction

Claims

1. Hydraulically actuated pressing tool (20) comprising a first pressing unit (21) and a second pressing unit (22), wherein the first pressing unit (21) and the second pressing unit (22) can be moved towards one another along a common longitudinal axis (X) by at least one hydraulically actuated cylinder-piston unit, the first pressing unit (21) and the second pressing unit (22) each delimit a free space (35), wherein at least one fixing unit (33L, 33R) is provided which has a locking pawl (33.1) which can be pivoted in and out of the free space (35) about an axis (33.2).

2. Press tool (20) according to claim 1, wherein the free space (35) has an open passage area (35.1) and the locking pawl (33.1) can be pivoted in and out of the passage area (35.1).

3. Press tool (20) according to claim 1 or 2, wherein the locking pawl (33.1) can be pivoted in against a spring force.

4. Press tool (20) according to claim 3, wherein the locking pawl (33.1) can be pivoted in against a spring force of a leg spring (34).

5. Press tool (20) according to at least one of claims 1 to 4, wherein the locking pawl (33.1) is pivotable about an axis (33.2) running parallel to the longitudinal axis (X).

6. Press tool (20) according to at least one of claims 1 to 5, wherein a limiting means (33.6) is provided by which a pivoting angle of the locking pawl (33.1) into the free space (35) is limited.

7. Press tool according to claim 6, wherein the pawl (33.1) has an extension (33.5) which cooperates with the limiting means (33.6).

8. Press tool according to claim 6 or 7, wherein the limiting means (33.6) is pin-shaped, 9. Press tool (20) according to claim 6 or 7, wherein the limiting means (33.6) is formed by a wall portion of an insert (31), wherein the insert (31) is detachably connected to a pressing unit (21).

10. Press tool 20) according to at least one of claims 1 to 9, wherein the locking pawl (33.1) can be fixed in a pivoted-out position.

11. Press tool according to at least one of claims 1 to 10, wherein the locking pawl (33.1) interacts directly or indirectly with a trigger unit (41L, 41R).

12. Press tool according to claim 11, wherein the trigger unit (41L, 41R) has an actuating rod (45) which has a button (44) at one end and a preferably wedge-shaped element (43) at the opposite end, wherein the actuating rod (45) extends through a holder (46) arranged on the press tool, wherein a return element (42), in particular a compression spring, is arranged between the holder (46) and the button (44), and wherein the element (43) is in operative connection with the extension (33.5).

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