DE102019115484A1 - Tool - Google Patents

Abstract

A tool for hand-held tool use is proposed, with a cylinder (11) and a piston (6) received in the cylinder (11) and movable in a working direction relative to the cylinder (11), the tool being an electro-hydraulic drive unit for comprises the drive of the piston (6) in the working direction, with the piston (6) experiencing a driven movement relative to the cylinder (11) during operation of the tool, and with an inside of the cylinder (6) for resetting the piston (6) against the working direction. 11) accommodated spring unit (10) is provided, wherein the piston (6) can be detachably connected to a tool attachment (16, 18) of the tool, so that, optionally, exactly one tool attachment (16, 18) from several different tool attachments with the piston (6 ) is connectable. According to the invention, a receptacle (13) is provided outside the cylinder (11), the receptacle (13) being connected to the piston (6) and remaining on the cylinder (11) for the operation of the tool with different tool attachments, with between the receptacle (13) and a tool attachment (16) quick connection means are designed such that a tool attachment (16) can be attached to the receptacle (13) without tools.

Description

State of the art

Hand-held or hand-operated tools in connection technology, for example for pressing, widening, bending or cutting are known, the tool for moving a tool attachment of the tool having a cylinder and a piston accommodated in the cylinder and movable in a working direction relative to the cylinder having. 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 a 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 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.

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 hand-held tool use, in particular a pressing, expanding, bending and / or cutting tool, with a single-acting cylinder and a piston received in the cylinder and movable in a working direction relative to the cylinder, wherein the tool comprises an electro-hydraulic drive unit for driving the piston in the working direction, with the piston experiencing a driven movement relative to the cylinder during operation of the tool, and with a spring unit housed inside the cylinder being provided for resetting the piston against the working direction, wherein the piston can be detachably connected 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 machined like a sanitary pipe section, is preferably indirectly connected to the piston. A tool attachment can be, for example, a pressing yoke, a sliding fork, a cutting attachment, an expanding mandrel or a bending attachment. Such tools are used, for example, as special tools in the sanitary sector. In addition to the tool attachment that can be moved with the piston, the tool regularly has a further tool attachment, at least one section to be machined or at least one element to be machined being positioned for the machining between the two tool attachments.

The spring unit preferably comprises a compression spring, in particular a pretensioned compression spring such as a 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 fills a cross section of the cylinder with a first axial side of the piston element and in particular adjoins a hydraulic chamber of the cylinder present in the cylinder, is secured by means of a sealing arrangement such as, for. 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 connected to a piston rod of the piston which extends inside the cylinder, on a side on which no hydraulic fluid is accommodated.

The electro-hydraulic drive unit comprises, for example, a battery-operated hydraulic pump for pumping 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 receptacle is provided outside the cylinder, the receptacle being connected to the piston and the receptacle remaining on the cylinder for operating the tool with different tool attachments, with quick-connect means being formed between the receptacle and a tool attachment that a tool attachment can be attached to the receptacle without tools. The recording, which can be moved back and forth on the outside The cylinder is present and is preferably provided with a sliding coating for this purpose, is part of the tool. The receptacle has sections on the outside and thus on the outside of the tool, to which a tool attachment is attached. 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 in particular remains permanently on the cylinder and thus on the tool, and the quick-connect means that are formed both on the receptacle and on the respective tool attachment, a situation that is improved 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 the present invention avoids. 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. In addition, it is laborious and time-consuming to remove the plug-in element every time a tool attachment is changed and then to 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 designed to 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 comprise a latching arrangement with, for example, a resilient latching section which engages in a resiliently pretensioned manner in a latching contour when the connection state is reached. About a releasable fuse of the locking portion, the locking quick connection is secured and z. B. can be canceled manually. For example, in that the resilient latching section can preferably be moved manually out of its latching position into a release position. This can be done, for example, by moving the receptacle relative to the cylinder, with a minimum force and / or a minimum torque having to be applied or overcome in a release direction.

The quick connection means have, for example, a fuse formed with a ball pressure piece. The quick connection means preferably also serve to prevent the tool attachment from rotating 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 at a point in the guide groove for the guide pin which forms a latching point for the guide pin resiliently snapping into it 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 comprising a piston element that is guided against a cylinder jacket inner side, with a first axial side of the piston element that adjoins adjoining a hydraulic space in the cylinder that is delimited by the first end face of the cylinder, the spring unit being accommodated in an area between the second end face of the cylinder and a section of the piston facing away from the first axial side of the piston element, the section of the piston being the facing the second axial face of the cylinder. The spring unit is preferably clamped between the second end face of the cylinder and a section on the piston rod. The piston or the piston element is displaceable back and forth inside the cylinder, the piston element separating a hydraulic space and a non-hydraulic space in the cylinder from one another. The size of the two spaces or the separation of the hydraulic space and the non-hydraulic space is dependent 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 such that one end of the spring unit or the compression spring reaches up to the piston rod. The piston rod protrudes in the 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. Depending on the position of the piston element in the cylinder, the length of the compression spring is determined during operation of the tool or is compressed to different degrees.

This means that a tool length that results between the tool attachments, and thus one that is relevant in practice Tool size dimensions 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 filled with hydraulic fluid. 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 on the piston rod which is removed over the substantial length of 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 area 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. A restoring force for restoring the piston in the direction opposite to the working direction is thus always provided within the cylinder. 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 to the receptacle is, for example, with a connecting member extending radially through the piston rod, such as. 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 movement path in the back and forth direction of the piston and thus the receptacle, two elongated, opposite passages or openings such as two elongated holes are provided in the cylinder wall of the cylinder in the longitudinal direction of the cylinder. The plug element is z. B. a pin such as 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 releasably attached to the cylinder in the area of the second axial end face of the cylinder, the attached fixed tool attachment being fixed in position on the cylinder when the tool is in operation. A relative movement thus takes place between the tool attachment and the fixed tool attachment during operation. 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 a work to be carried out with the tool, the fixed tool attachment interacts with the tool attachment attached or movable to the receptacle. An object to be processed such as B. a line section and a press fitting that can be pressed onto it are provided 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 provides a flexibly applicable tool, preferably a combination tool with a respective tool function or with at least two combined tool functions according to the aforementioned tool attachment variants, with a tool base body, i.e. the majority of the tool without a tool attachment, being the same for all variants or is universally applicable. The different tool attachments preferably each have the same sections of the quick connection means for the respective tool-free attachment to the receptacle.

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 fixed radially and axially, preferably rigidly, on the receptacle in a fixed position via at least one securing element. In this way, the tool attachment is securely and firmly attached to the tool even when the tool is under load during tool operation, 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 longitudinal direction of the cylinder on the outside of the holder.

According to a modification of the invention, the fixed tool attachment can be releasably attached to the cylinder via bayonet connectors. With bayonet connecting means, a proven type of connection is provided, the connection being 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. Thus, the fixed tool attachment, if it has two or more different, circumferentially offset, individually acting tool sections present thereon, can be attached to the tool or to the outside of the cylinder of the tool in a desired exact, in particular exactly circumferential, alignment.

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 or haptic latching, a connection state is set up safely and permanently. The latching mechanism can have a latching element, for example, resiliently mounted, and have a latching contour that interacts appropriately with the latching element and is present on the one hand on the cylinder and on the other hand on the fixed tool attachment.

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

Figure list

• 1 eine perspektivische Explosionsansicht eines Teils eines erfindungsgemäßen Werkzeugs schräg von der Seite,
• 2 den Teil des Werkzeugs gemäß 1 in Seitenansicht, mit angedeuteten Innenkonturen,
• 3 den Teil des zusammengebauten Werkzeugs in der Seitenansicht gemäß 2 im Längsschnitt und
• 4 den Teil des zusammengebauten Werkzeugs gemäß 3 in einem Längsschnitt gemäß Linie A-A in 3.

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 a perspective exploded view of part of a tool according to the invention obliquely from the side,
• 2 the part of the tool according to 1 in side view, with indicated inner contours,
• 3 the part of the assembled tool in the side view according to 2 in longitudinal section and
• 4th the part of the assembled tool according to 3 in a longitudinal section along line AA in 3 .

In the figures is a tool head 2 a hand-held tool according to the invention shown, which as a pressing tool 1 is trained. The pressing tool 1 as a whole is in 3 indicated, with below the tool head specifically shown 2 a schematic outline of a hand-operated section 3 of the pressing tool 1 shown in phantom and broken lines.

The tool head 2 can be assembled from individual tool elements. The tool head 2 includes a hydraulic fluid supply 4th , which is designed as an oil supply, ring components 5 , a piston 6th with a piston element 7th and a piston rod 8th , an O-ring 9 , a spring unit 10 , a hollow cylinder 11 , a threaded ring 12th , a recording 13th , a liaison body 14th , the plug element 15th is designed, a movable tool attachment 16 and a fixed tool attachment 18th . The movable tool attachment 16 is as a compression yoke 17th and the fixed tool attachment 18th is as a compression yoke 19th educated. At the press yoke 17th are three circumferentially offset fork sections 17a formed with each other different fork width. Correspondingly are on the press yoke 19th three circumferentially offset fork sections 19a designed with different fork widths from each other (s. 1 ).

The cylinder 11 has a first axial end face 11a and a second axial end face 11b on. The piston element 7th has a first axial side 7a on that of the first axial end face 11a of the cylinder 11 is facing. The piston 6th has one of the first axial side 7a of the piston element 7th remote section 6a on, with the section 6a of the piston 6th the second axial end face 11b of the cylinder 11 is facing.

The ring components 5 include two O-rings, two backup rings, a U-ring and a retaining ring.

The piston element 7th and the piston rod 8th are firmly screwed together.

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

The pressing tool 1 comprises an electro-hydraulic drive unit for driving the piston 6th and thus the compression yoke 17th in the working direction P1, the drive unit (not shown) being essentially in the manual operating section 3 is housed.

In the single-acting hollow cylinder 11 is that in the working direction P1 and opposite in a return direction P2 relative to the cylinder 11 movable pistons 6th linearly displaceable and guided. The cylinder 11 is at one axial end, at which the press yoke 19th is received externally, closed by a bottom that is integral with the rest of the cylinder 11 is trained. The other open end of the cylinder 11 is through the hydraulic fluid supply 4th locked.

For resetting the piston 6th in the return direction P2 that is also within the cylinder 11 housed spring unit 10 responsible.

The piston rod 8th is with the help of the cylindrical plug element 15th with the recording 13th connected. This is done in the area of a free end of the piston rod 8th two diametrically opposite matching holes or round holes 20th , 21st and in the recording 13th two opposite holes or round holes 22nd , 23 provided which the plug element 15th fills out. The plug-in element also engages 15th through two opposite passages 24 , 25th in the wall of the hollow cylinder 11 , with the two passages 24 , 25th are designed as elongated holes.

Furthermore, there are quick connectors 26th between the recording 13th and the tool attachment 16 formed so that the tool attachment 16 detachable and tool-free on the mount 13th is attachable. The quick connector 26th have a fuse element 27 with which the tool attachment 16 at the recording 13th can be fixed, preferably in the longitudinal direction of the cylinder 11 or is radially fixable.

The tool attachment 17th is on the cylinder 11 for example pushed on and held by locking pieces.

For example, the tool attachment 17th on the cylinder 11 also via quick connectors 28 , preferably as a bayonet connector 29 are designed, releasable but firmly, manually on the cylinder 11 be attached. The bayonet lanyard 29 include e.g. B. a locking mechanism for locking the tool attachment 17th on the cylinder 11 . This is at the end of the cylinder 11 a circumferential ring groove 30th designed with a flat groove base and a first wall or flank oriented perpendicular to the groove base and an opposite second wall which is oriented at an angle greater than 90 degrees to the groove base.

In the 3 and 4th is a situation or a basic position of the pressing tool 1 or the tool head 2 shown in what under the action of preloaded in the cylinder 11 housed spring unit 10 the piston 6th and with it the recording 13th and the press yoke 17th in the return direction P2 from the pressing yoke 17th is moved away.

Starting from the basic position of the pressing tool 1 is used for a working stroke or for the movement of the piston 6th in the working direction P1 the hand-operated pressing tool by manually acting on the hand-operated section 3 actuates the drive unit. It is in a memory in the manual operating section 3 stored hydraulic fluid through an opening 33 at the hydraulic fluid supply 4th in a hydraulic line 31 in the hydraulic fluid supply 4th pumped towards P0. The pumping process is carried out with a preferably battery-operated hydraulic fluid pump in the manual control section 3 . Here hydraulic fluid reaches the hydraulic line 31 in a hydraulic room 32 in the tool head 2 between an inside of the hydraulic fluid supply 4th and a first axial side of the piston element 7th which is the axial side of the piston element 7th facing away with the piston rod or opposite. Due to the hydraulic pressure acting in the hydraulic space 32 , at z. B. continuously pumped hydraulic fluid is the piston element 7th and with it the piston rod 8th , the recording 13th and the press yoke 17th moved in working direction P1. The spring unit 10 is reduced in length or compressed more. Under the hydraulically applied force, a press connector (not shown) attached to a line (not shown) is pressed onto the line, for example. The corresponding pipe section with press connector is previously placed between the two press yokes that have moved apart 17th and 19th used, in each case on mutually aligned fork sections corresponding in pairs in the longitudinal direction 17a and 19a .

There is a respective fork section for guiding and inserting the press connector and the line 17a or. 19a on the compression yokes 17th and 19th available. The three different fork sections that are matched to a respective line diameter are used to operate different diameter sizes of the line or the press connector 17a , 19a correspondingly offset on the compression yokes 17th and 19th available. Depending on the pipe diameter, the pressing yokes are 17th and 19th in linear correspondence of the fork sections associated with one another 17a , 19a at the recording 13th or the cylinder 11 attached in the correct circumferential position, what about the quick connect means 26th or. 28 is possible.

After a work step, the manual operating section is operated 3 Hydraulic fluid from the hydraulic space 32 pressed against the direction P0 in the direction of the accumulator, which is under the pressure of the previously further tensioned spring unit 10 he follows. The grouting yoke is reset 17th towards 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

4th

Hydraulic fluid supply

5

Ring components

6th

piston

6a

section

7th

Piston element

7a

page

8th

Piston rod

9

O-ring

10

Spring unit

11

cylinder

11a, 11b

Face

12

Threaded ring

13th

admission

14th

Liaison body

15th

Plug-in element

16

Tool attachment

17th

Compression yoke

17a

Fork section

18th

Tool attachment

19th

Compression yoke

19a

Fork section

20, 21

Round hole

22, 23

Round hole

24, 25

passage

26th

Quick connector

27

Fuse element

28

Quick connector

29

Bayonet connector

30th

Ring groove

31

Hydraulic line

32

Hydraulic room

33

opening

Claims (12)

Tool for hand-held tool use, in particular a pressing tool (1), an expanding, bending and / or cutting tool, with a single-acting cylinder (11) and one received in the cylinder (11) and in a working direction relative to the cylinder (11) movable piston (6), the tool comprising an electro-hydraulic drive unit for driving the piston (6) in the working direction, the piston (6) experiencing a driven movement relative to the cylinder (11) when the tool is in operation , and wherein a spring unit (10) housed inside the cylinder (11) is provided for resetting the piston (6) against the working direction, the piston (6) being releasably connectable to a tool attachment (16, 18) of the tool, 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 remaining on the cylinder (11) for the operation of the tool with different tool attachments, with quick-connect means (26) between the receiving element (13) and a tool attachment (16) ) are designed such that a tool attachment (16) can be attached to the receptacle (13) without tools. Tool according to the generic term of Claim 1 , especially after 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), the piston (6) having a piston element guided against the inside of a cylinder jacket (7) comprises, with a first axial side (7a) of the piston element (7) which adjoins a hydraulic space (32) which is present in the cylinder (11) and which is delimited by the first end face (11a) of the cylinder (11), wherein the spring unit (10) in one Area between the second end face (11b) of the cylinder (11) and a section (6a) of the piston (6) facing away from the first axial side (7a) of the piston element (7), the section (6a) of the piston (6 ) facing the second axial end face (11b) of the cylinder (11). Tool after Claim 1 or Claim 2 , 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). 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). Tool according to one of the preceding claims, characterized in that a connecting member (14) for connecting the piston rod (8) and the receptacle (13) is provided, which through the piston rod (8) in an end area facing away from the piston element (7) Piston rod (8) passes through. 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) being transverse to the working direction through the cylinder ( 11) extends and extends into a recess (22, 23) of the receptacle (13). Tool according to one of the preceding claims, characterized in that a fixed tool attachment (18) can be detachably attached to the cylinder (11) in the area of the second axial end face of the cylinder (11), the attached fixed tool attachment (18) during operation of the Tool on the cylinder (11) is fixed in position. Tool according to one of the preceding claims, 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. Tool according to one of the preceding claims, characterized in that the tool attachment (16, 18) can be fixed and / or radially fixed on the receptacle (13) via a securing element (27). Tool according to one of the preceding claims, characterized in that the fixed tool attachment (18) can be detachably attached to the cylinder (11) via bayonet connection means (29). Tool according to one of the preceding claims, characterized in that the bayonet connection means (29) are designed in such a way that the fixed tool attachment (18) can only be positioned in exactly one position on the cylinder (11) that is circumferential to the working direction. Tool according to one of the preceding claims, characterized in that the bayonet connection means (29) comprise a latching mechanism for latching the fixed tool attachment (18) on the cylinder (11).

Images