EP3980221A1

EP3980221A1 - Tool

Info

Publication number: EP3980221A1
Application number: EP20733215.6A
Authority: EP
Inventors: Daniel Gaupp
Original assignee: Rehau AG and Co; Baudat GmbH and Co KG
Current assignee: Rehau Industries SE and Co KG; Baudat GmbH and Co KG
Priority date: 2019-06-07
Filing date: 2020-06-08
Publication date: 2022-04-13
Also published as: CN113939660A; WO2020245449A1; DE102019115484A1

Abstract

The invention relates to a tool for a hand-operated tool application, comprising a cylinder (11) and a piston (6) which is received in the cylinder (11) and moves in a working direction relative to the cylinder (11), wherein the tool comprises an electro-hydraulic drive unit for driving the piston (6) in the working direction, and the piston (6) undergoes a driven movement relative to the cylinder (11) during operation. A spring unit (10) is provided which is accommodated within the cylinder (11) in order to reset the piston (6) against the working direction, and the piston (6) can be releasably connected to a tool attachment (16, 18) of the tool such that precisely one tool attachment (16, 18) of a plurality of different tool attachments can selectively be connected to the piston (6). According to the invention, a receiving area (13) is provided outside of the cylinder (11), and the receiving area (13) is connected to the piston (6) and remains on the cylinder (11) in order to operate the tool with different tool sets. A rapid connection means is formed between the receiving area (13) and a tool set (16) such that a tool set (16) can be attached to the receiving area (13) without tools.

Description

"Tool"

State of the art

Hand-held or hand-operated tools in the

Connection technology, for example for pressing, for expanding, for bending or for cutting are known, the tool for moving a tool attachment of the tool having a cylinder and one received in the cylinder and into a

Has working direction relative to the cylinder movable piston. The piston can be coupled to the tool attachment.

Such tools include, for example, an electro

Hydraulic drive unit with which the piston is moved in the working direction during one work step. When the tool is in operation, the piston experiences a driven movement relative to the cylinder, a spring unit housed inside the cylinder being provided for a new work step or for resetting the piston counter to the working direction. This is based on the principle of a single-acting cylinder.

With the movement of the piston, the tool attachment of the tool in question can be detachably connected. Preferably, with the tool, exactly one tool attachment from several different tool attachments is optionally connected to the piston in order to move the tool attachment together with the piston. Object and advantages of the invention

The object of the present invention is to provide a hand-held

To provide a tool of the type mentioned at the outset which is designed to be improved with regard to practical use, in particular a tool which is more compact and with which flexible use of different tool attachments is facilitated in the application.

This problem is solved by the independent claims. The dependent claims address advantageous and useful developments of the invention.

The invention is based on a tool for one

hand-guided tool use, in particular of a pressing, expanding, bending and / or cutting tool, with a single-acting cylinder and a piston received in the cylinder and movable in one working direction relative to the cylinder, the tool being an electro-hydraulic drive unit for the Includes driving the piston in the working direction, wherein the piston experiences a driven movement relative to the cylinder during operation of the tool, and wherein for resetting the

Piston against the working direction one within the

The spring unit accommodated in the cylinder is provided, the piston being releasably connectable to a tool attachment of the tool, so that, optionally, exactly one tool attachment from several different tool attachments can be connected to the piston.

The tool attachment, which actually forms the outwardly effective part of the tool, which acts on a section to be processed like a sanitary pipe section

preferably indirectly connected to the piston. One

The tool attachment can, for example, be a pressing yoke, a

Sliding fork, a cutting attachment, an expanding mandrel or a

Be bending attachment. Such tools are used, for example, as special tools in the sanitary sector. The tool regularly has next to that movable with the piston

Tool attachment another tool attachment, wherein

at least one closed between the two tool attachments machining section or at least one element to be machined is positioned for machining.

The spring unit preferably comprises a compression spring, in particular a pretensioned compression spring such as one

Helical compression spring.

The piston preferably comprises a piston element and a

Piston rod. The piston or at least the piston element of the piston, which with a first axial side of the

Piston element fills a cross section of the cylinder and in particular adjoins a hydraulic chamber of the cylinder that is present in the cylinder, is by means of a sealing arrangement such. B. a ring seal over its movement path on the tool or in the cylinder hydraulically tightly received and guided. The other side of the piston element is preferably with a

Piston rod connected to the piston, which extends inside the cylinder, on one side on which none

Hydraulic fluid is housed.

The electro-hydraulic drive unit includes, for example, a battery-operated hydraulic pump for delivering

Hydraulic fluid from a storage volume into a

Hydraulic space in the cylinder. The hydraulic space is preferably variable in volume, depending on the position of the piston in the cylinder.

One aspect of the invention is that a recording

is provided outside the cylinder, wherein the receptacle is connected to the piston and the receptacle remains for the operation of the tool with different tool attachments on the cylinder, wherein between the receptacle and a tool attachment quick connection means are formed such that a

Tool attachment can be attached to the receptacle without tools. The receptacle, which is present on the outside of the cylinder so that it can be moved back and forth, and for this purpose preferably with a

The anti-friction coating is part of the tool. The receptacle has the outside and thus the outside of the tool Sections where the attachment of a tool attachment takes place. The receptacle is preferably a tool element which circumferentially surrounds the cylinder on the outside over a partial axial length of the cylinder, for example a sleeve piece lying on the outside of a cylinder jacket of the cylinder.

With the receptacle, which remains permanently on the cylinder and thus on the tool, and the quick-connect means that are both on the receptacle and on the respective

Tool attachment are formed, an improved situation compared to previous tools is achieved. Because so far a tool attachment is each via a releasable connecting means such as a plug element that z. B. engages through the piston and the tool holder, a detachable connection is realized. This has several disadvantages, which with the

present invention can be prevented. For example, an unplugged plug-in element is regularly misplaced or lost in practice. In addition, the plug-in element is often soiled or damaged when it is not in use or when it is not in use, since it is not installed on the tool and is therefore unprotected. It is also cumbersome and time consuming to change one every time

To remove the plug-in element from the tool attachment and then insert it again for the new or next-used tool attachment. With quick connectors, the tool attachment can be changed in a simple manual operation, for example in a few seconds.

The quick connection means can be very compact and

Captive on the receptacle and on the tool attachment, there in particular protected against damage from the outside. The quick connection means preferably include a latching arrangement with, for example, a resilient latching section which engages in a resiliently pretensioned manner in a latching contour

Reaching the connection state. About a releasable fuse of the locking portion, the locking quick connection is secured and z. B. can be canceled manually. For example, by the resilient latching section, preferably manually from its latching position in a release position is movable. This can be done for example by a relative movement of the receptacle to the cylinder, with a minimum force and / or a minimum torque in a

The direction of release must be applied or overcome.

The quick connection means have, for example, a fuse formed with a ball pressure piece. The

Quick connect means preferably also serve as

Anti-twist protection of the tool attachment relative to the cylinder. The quick connection means preferably comprise a spring-loaded guide pin which engages in a guide groove and runs along the guide groove until a point in the guide groove for the guide pin has a latching point for the resilient therein

snap-in guide pin forms when a

Connection position is reached.

The invention is also based on the fact that the cylinder has a first axial end face and a second axial end face opposite the first axial end face, the piston resting against an inside of the cylinder jacket

includes guided piston element, with a first axial side of the piston element, which is present in the cylinder

Hydraulic space is adjacent, from the first face of the

Cylinder is limited, the spring unit being housed in an area between the second end face of the cylinder and a portion of the piston facing away from the first axial side of the piston element, the portion of the piston facing the second axial end face of the cylinder. The spring unit is preferably between the second end face of the cylinder and a section on the piston rod

clamped. The piston or the piston element can be moved back and forth inside the cylinder

Piston element separates a hydraulic space and a non-hydraulic space in the cylinder. The size of the two spaces or the separation of the hydraulic space and the non-hydraulic space depends on the current position of the piston element in the cylinder. A piston rod preferably projects from the second side of the piston element. Accordingly, it is preferably so that the spring unit or the compression spring with one end to the

Piston rod reaches. The piston rod is in

Working direction or in the direction in which the piston performs a working stroke.

The spring unit or the helical compression spring is preferably clamped between the second axial side of the piston element and the second end face of the cylinder. A length dimension of the spring unit or the compression spring is dependent on the position of the piston in the cylinder or the distance between the second axial side of the piston element and the second end face of the

Cylinder. According to the position of the piston element in the

Cylinder, the length of the compression spring is determined or compressed to different degrees when the tool is in operation.

This allows a tool length that is between the

Tool attachments results, and thus a tool size dimension relevant in practice can be reduced, since the spring unit can be reduced to a stowage length or can be compressed to its minimum length.

The cylinder is stationary on the tool or does not experience any movement with the drive unit. The single-acting cylinder or the hydraulic cylinder has hydraulic fluid applied to it only on one side of the piston, and work is only performed in one direction.

It is also advantageous that the piston has a piston rod which protrudes on a side of the piston element facing away from the hydraulic chamber in the direction of the second end face of the cylinder. The piston rod is advantageously present in a space inside the cylinder that is not with

Hydraulic fluid is filled. The tool attachment is connected to the piston or its piston rod, which together with the piston element forms the piston, e.g. B. at an axial point of the piston rod over the substantial length is removed from the piston element or in the region of a free end of the piston rod.

The spring unit is advantageously accommodated in an area between the second end face of the cylinder and an end area of the piston rod facing away from the piston element.

The spring unit is supported with one end of the spring unit preferably on the end region of the piston rod and with the other end on the second, axial inner end face of the

Cylinder. The spring unit or the compression spring is clamped or housed pretensioned. So there is always a

Restoring force to return the piston to the

Working direction opposite direction within the

Cylinder provided. The restoring force comes into play when the counterforce according to the hydraulic pressure on the first axial side of the piston element is less than the counteracting spring force on the other axial piston side.

It is also advantageous if a connecting element is provided for connecting the piston rod and the receptacle, which element extends through the piston rod in an end region of the piston rod facing away from the piston element.

The connection of the piston rod with the receptacle is to

Example with a radially penetrating through the piston rod connecting member such. B. set up a plug element.

Preferably, both ends of the connecting member or the plug-in element, which protrude beyond the outside of the cylinder, each engage in a matching depression, opening or recess on the receptacle. For this purpose, there are two diametrically opposite openings on the receptacle for the straight elongated connecting element or plug-in element. The respective longitudinal ends of the plug element z. B. flat end faces are preferably flush with or slightly sunk to an outside of the receptacle. For reaching through and overcoming the

Path of movement in the back and forth direction of the piston and thus the receptacle are two in on the cylinder in its cylinder wall Longitudinal direction of the cylinder elongated, opposite

Passages or openings such as two elongated holes are available. The plug element is z. B. a pin like

for example a cylindrical pin.

An advantageous variant is characterized in that the piston and the receptacle can be connected to a connecting element designed as a plug-in element, the plug-in element reaching through the cylinder transversely to the working direction and extending into a recess in the receptacle.

The recess is preferably an opening such as a

Through hole or a recess.

According to another advantageous embodiment, a fixed tool attachment can be detachably attached to the cylinder in the region of the second axial end face of the cylinder, the

attached fixed tool attachment is fixed in position when the tool is in operation on the cylinder. So that a

Relative movement between the tool attachment and the fixed tool attachment in operation instead. The fixed tool attachment is in particular a tool attachment which, when attached, is fixed in position relative to the cylinder when the tool is in operation on the outside of the cylinder in the axial direction or in the working direction. For the tool function or one with the tool

work to be carried out, the fixed tool attachment interacts with the tool attachment attached or movable to the holder. An object to be processed such as B. a

Line section and a press fitting that can be pressed onto it are present between the two tool attachments.

In addition, there is an advantage that the

Tool attachment is designed as a bending tool attachment and / or as a pressing tool attachment and / or as an expanding tool attachment and / or as a cutting tool attachment. This becomes a flexibly applicable tool, preferably a

Combination tool with a respective tool function or with at least two combined tool functions according to FIG The aforementioned tool attachment variants are provided, with a tool base body, i.e. the predominant part of the tool without a tool attachment, being the same or the same for all variants.

is universally applicable. Preferably the

different tool attachments over the same

Sections of the quick connector to the respective

tool-free attachment to the mount.

The tool attachment can advantageously be secured to the receptacle via a securing element and / or can be fixed radially.

The tool attachment is preferably at least one

Securing element radially and axially, preferably rigidly, fixed in position on the receptacle. This is also under

Load on the tool in tool operation, the tool attachment is securely and firmly attached to the tool, with the result that the

Tool function is provided with high reliability.

A fuse element is z. B. a resiliently mounted pin or cylinder pin, which protrudes radially on the tool attachment radially inward and engages in a matching groove of the receptacle.

The groove runs in the working direction or the longitudinal direction of the

Cylinder on the outside of the mount.

According to a modification of the invention, the fixed tool attachment can be releasably attached to the cylinder via bayonet connectors.

With bayonet fasteners a tried and tested

Type of connection provided, the connection securely set up with a simple handle and after a z. B.

manual unlocking process can be canceled again.

The bayonet connection means are advantageously designed in such a way that the fixed tool attachment can only be positioned in exactly one position on the cylinder that is circumferential to the working direction. This means that the fixed tool attachment can, if it has two or more different ones on it

has existing individually acting tool sections, in a desired exact in particular exactly circumferential

Alignment are attached to the tool or the outside of the cylinder of the tool. Another advantage can be seen in the fact that the bayonet connection means comprise a latching mechanism for latching the fixed tool attachment on the cylinder. With a z. B. audible locking or haptic locking is a

Connection status set up securely and permanently. The

Latching mechanism can have a latching element, for example, resiliently, and have a latching contour that interacts with the latching element and that on the one hand on the cylinder and

on the other hand are present on the fixed tool attachment.

This enables a stable and reliably set up detachable latching mechanism.

Figure description

Further features and advantages of the invention are explained below on the basis of an exemplary embodiment, which is shown in part schematically. In detail shows:

1 is an exploded perspective view of a

Part of a tool according to the invention at an angle from the side,

Fig. 2 shows the part of the tool according to FIG. 1 in

Side view, with indicated inner contours,

Fig. 3 the part of the assembled tool in the

Side view according to FIG. 2 in longitudinal section and

4 shows the part of the assembled tool according to FIG

FIG. 3 in a longitudinal section along line AA in FIG. 3. In the figures, a tool head 2 of a hand-held tool according to the invention is shown, which as

Pressing tool 1 is formed. The pressing tool 1 as a whole is indicated in FIG. 3, with a schematic outline of a hand-operated section 3 of the pressing tool 1 being shown in dashed and broken lines below the tool head 2 shown specifically.

The tool head 2 is made up of individual tool elements

assemblable. The tool head 2 comprises a

Hydraulic fluid feed 4, which acts as an oil feed

is formed, ring components 5, a piston 6 with a

Piston element 7 and a piston rod 8, an O-ring 9, a spring unit 10, a hollow cylinder 11, a threaded ring 12, a receptacle 13, a connecting member 14, which acts as a plug-in element

15 is formed, a movable tool attachment 16 and a fixed tool attachment 18. The movable tool attachment

16 is designed as a pressing yoke 17 and the fixed tool attachment 18 is designed as a pressing yoke 19. On the pressing yoke 17, three circumferentially offset fork sections 17a with mutually different fork widths are formed. Correspondingly, there are three circumferentially offset on the pressing yoke 19

Fork sections 19a are designed with fork widths that differ from one another (see FIG. 1).

The cylinder 11 has a first axial end face 11a and a second axial end face 11b. The piston element 7 has a first axial side 7 a, which faces the first axial end side 11 a of the cylinder 11. The piston 6 has one of the first axial side 7a of the piston element 7 facing away

Section 6a, the section 6a of the piston 6 facing the second axial end face 11b of the cylinder 11.

The ring components 5 include two O-rings, two support rings, a groove ring and a locking ring. The piston element 7 and the piston rod 8 are firmly screwed together.

The spring unit 10 shown schematically is preferably designed as a helical compression spring.

The pressing tool 1 comprises an electro-hydraulic one

Drive unit for driving the piston 6 and thus the pressing yoke 17 in the working direction PI, the drive unit (not shown) being accommodated essentially in the manual operating section 3.

In the single-acting hollow cylinder 11 is in the

Working direction PI and counter to a return direction P2 relative to the cylinder 11 movable piston 6 linearly displaceable and received. At one axial end at which the pressing yoke 19 is received on the outside, the cylinder 11 is closed by a base which is formed in one piece with the remaining part of the cylinder 11. The other open end of the cylinder 11 is closed by the hydraulic fluid supply 4.

The spring unit 10, which is also accommodated within the cylinder 11, is responsible for resetting the piston 6 in the resetting direction P2.

The piston rod 8 is connected to the receptacle 13 with the aid of the cylindrical plug element 15. For this purpose, two diametrically opposite matching holes or round holes 20, 21 and in the receptacle 13 two opposite holes or round holes 22, 23 are provided in the area of a free end of the piston rod 8, which the plug element 15 fills. It also works

Plug element 15 through two opposite passages 24, 25 in the wall of the hollow cylinder 11, the two passages 24, 25 being designed as elongated holes.

Furthermore, quick connection means 26 are between the

Recording 13 and the tool attachment 16 formed so that the Tool attachment 16 is detachable and can be attached to receptacle 13 without tools. The quick connection means 26 have a

Securing element 27, with which the tool attachment 16 can be fixed to the receptacle 13, preferably can be fixed in the longitudinal direction of the cylinder 11 or radially.

The tool attachment 17 is on the cylinder 11 for example

pushed open and held by locking pieces.

For example, the tool attachment 17 on the cylinder 11 can also be attached manually to the cylinder 11 in a detachable but fixed manner via quick connection means 28, which are preferably configured as bayonet connection means 29. The bayonet connection means 29 comprise, for. B. a locking mechanism for locking the tool attachment 17 on the cylinder 11. For this purpose, a circumferential annular groove 30 is formed at the end of the cylinder 11 with a flat groove base and a first wall or flank and a perpendicular to the groove base

opposite second wall, which is aligned with an angle greater than 90 degrees to the groove base.

3 and 4 show a situation or a basic position of the pressing tool 1 or of the tool head 2, in which the piston 6 and thus the piston 6 and thus the

Recording 13 and the press yoke 17 is moved away from the press yoke 17 in the return direction P2.

Starting from the basic position of the pressing tool 1, for a working stroke or for the movement of the piston 6 in

Direction of work PI the hand-held pressing tool by manually acting on the hand-operated section 3 the

Drive unit actuated. Hydraulic fluid stored in a memory in the manual operating section 3 is pumped into a hydraulic line 31 in the hydraulic fluid supply 4 in the direction PO via an opening 33 on the hydraulic fluid supply 4. The pumping process takes place with a

preferably battery-operated hydraulic fluid pump in the Manual operating section 3. In this case, hydraulic fluid reaches a hydraulic space 32 in the hydraulic line 31

Tool head 2 between an inside of the

Hydraulic fluid supply 4 and a first axial side of the piston element 7, which is the axial side of the

Piston element 7 faces away with the piston rod or

opposite. The hydraulic pressure acting in the

Hydraulic chamber 32, at z. B. continuously re-pumped

Hydraulic fluid is the piston element 7 and thus the

Piston rod 8, the receptacle 13 and the pressing yoke 17 in

Moving direction PI. The spring unit 10 is reduced in length or compressed more strongly. Under the hydraulically applied force, for example a press connector (not shown) placed on a line (not shown) is pressed onto the line. The corresponding line piece with press connector is previously inserted between the two extended press joints 17 and 19, in each case at one that is aligned in the longitudinal direction

fork sections 17a and 19a corresponding to one another in pairs.

To guide and insert the press connector and the line, a respective fork section 17a or 19a is provided on the press yokes 17 and 19. For the operation

different diameter sizes of the line or the press connector are the three different ones on one

fork sections 17a matched to the respective line diameter,

19a coincidentally offset circumferentially on the pressing yokes 17 and 19. Depending on the cable diameter, the

Verpressj oche 17 and 19 in linear correspondence of the mutually associated fork sections 17a, 19a attached to the receptacle 13 or the cylinder 11 in the correct circumferential position, which is possible via the quick connection means 26 and 28, respectively.

After a work step, hydraulic fluid is pressed out of the hydraulic chamber 32 counter to the direction PO in the direction of the accumulator by operating the manual operating section 3, which takes place under the pressure of the previously further tensioned spring unit 10. The pressing yoke 17 in is reset Direction P2. The pressing tool 1 is removed from the object to be processed.

List of reference symbols

1 pressing tool

2 tool head

3 hand control section

4 hydraulic fluid supply

5 ring components

6 pistons

6a section

7 piston element

7a page

8 piston rod

9 O-ring

10 spring unit

11 cylinders

11a, 11b front side

12 threaded ring

13 Admission

14 Liaison body

15 plug element

16 tool attachment

17 pressing yoke

17a fork section

18 tool attachment

19 compression joint

19a fork section

20, 21 round hole

22, 23 round hole

24, 25 passage

26 Quick connectors

27 security student

28 fast lanyards

29 Bayonet lanyards

30 ring groove

31 hydraulic line

32 hydraulic room

33 opening

Claims

Expectations

1. Tool for hand-held tool use,

in particular a pressing tool (1), an expanding, bending and / or cutting tool, with a single-acting one

Cylinder (11) and one received in the cylinder (11) and movable in a working direction relative to the cylinder (11)

Piston (6), the tool being an electro-hydraulic

Drive unit for driving the piston (6) into the

Direction of work includes, with the operation of the tool

Piston (6) experiences a driven movement relative to the cylinder (11), and a spring unit (10) housed inside the cylinder (11) is provided for resetting the piston (6) against the working direction, the piston (6) having a Tool attachment (16, 18) of the tool can be detachably connected, so that, optionally, exactly one tool attachment (16, 18) from several different tool attachments can be connected to the piston (6), characterized in that a receptacle (13) outside the cylinder (11 ) is provided, the receptacle (13) being connected to the piston (6) and for operating the tool with different tool attachments on the cylinder (11)

remains, between the receptacle (13) and a

Tool attachment (16) quick connection means (26) such

are designed so that a tool attachment (16) can be attached to the receptacle (13) without tools.

2. Tool according to the preamble of claim 1, in particular according to claim 1, characterized in that the cylinder (11) has a first axial end face (11a) and a second axial end face (11b) opposite the first axial end face (11a), wherein the piston (6) comprises a piston element (7) guided against the inside of a cylinder jacket, with a first axial side (7a) of the piston element (7) which adjoins a hydraulic space (32) present in the cylinder (11), which is from the first end face (11a) of the cylinder (11) is limited, the spring unit (10) facing away in an area between the second end face (11b) of the cylinder (11) and one of the first axial side (7a) of the piston element (7) section (6a) of the piston (6) is accommodated, the section (6a) of the piston (6) of the second axial end face (11b) of the

Cylinder (11) is facing.

3. Tool according to claim 1 or claim 2, characterized

characterized in that the piston (6) has a piston rod (8)

which protrudes on a side of a piston element (7) facing away from the hydraulic chamber (32) in the direction of the second end face of the cylinder (11).

4. Tool according to one of the preceding claims, characterized in that the spring unit (10) is accommodated in an area between the second end face of the cylinder (11) and an end area of the piston rod (8) facing away from the piston element (7).

5. Tool according to one of the preceding claims, characterized in that a connecting member (14) for the

Connection of the piston rod (8) and the receptacle (13) is provided, which by the piston rod (8) in one of the

Piston element (7) facing away from the end region of the piston rod (8) passes through.

6. Tool according to one of the preceding claims, characterized in that the piston (6) and the receptacle (13) can be connected to a connecting element (14) designed as a plug-in element (15), the plug-in element (15) transversely to the

The working direction extends through the cylinder (11) and extends into a recess (22, 23) in the receptacle (13).

7. Tool according to one of the preceding claims, characterized in that in the region of the second axial end face of the cylinder (11) a fixed tool attachment (18) releasably on

Cylinder (11) can be attached, the attached fixed tool attachment (18) being present in a fixed position on the cylinder (11) when the tool is in operation.

8. Tool according to one of the preceding claims, characterized characterized in that the tool attachment (16, 18) is designed as a bending tool attachment and / or as a pressing tool attachment and / or as an expanding tool attachment and / or as a cutting tool attachment.

9. Tool according to one of the preceding claims, characterized in that the tool attachment (16, 18) has a

Securing element (27) can be fixed and / or radially fixed on the receptacle (13).

10. Tool according to one of the preceding claims, characterized in that the fixed tool attachment (18) over

Bayonet connector (29) releasable on the cylinder (11)

is attachable.

11. Tool according to one of the preceding claims, characterized in that the bayonet connecting means (29) are designed in such a way that the fixed tool attachment (18) can be positioned in just one position on the cylinder (11) which is circumferential to the working direction.

12. Tool according to one of the preceding claims, characterized in that the bayonet connecting means (29) comprise a locking mechanism for locking the fixed tool attachment (18) on the cylinder (11).