EP3434331B1 - Hydraulic implement - Google Patents

Description

The present invention relates to a hydraulic working device for portable use according to the preamble of claim 1.

Technological background

Hydraulic tools for portable use are usually used by the fire brigade for rescue operations. They have an electrically operated hydraulic pump, a battery housed in the device and swiveling tool halves. These are mainly used for cutting body parts and for spreading or opening vehicle doors. Such devices can also be used in disaster situations such. B. used in the rescue of buried victims. However, these devices often have a high weight and relatively large dimensions, so that they are often not very suitable for mobile universal use. In addition, the possible uses of such devices are limited by the type of tool halves used.

Printed state of the art

A tool according to the preamble of claim 1 is from the JP 2004 082273 A known. The hydraulic working device comprises two tool halves, which in the closed state form a tapering, flat extension which opens when the working device is operated in the manner of a pair of scissors in order to separate frame parts from a fastening base or to remove fastening elements. The two tool halves are L-shaped and are more or less overlapping on top of each other. One of the two tool halves is double-sided and forms a gap, over the entire length of which the other tool half engages.

A tool with cutting and spreading function known from the data sheet SC 357 E2 from LUKAS Hydraulik GmbH includes two tool halves that have a toothed cutting contour and form a triangular spreading contour on the front. The cutting contour ends at the expanding jaw.

From the EP 0 419 810 A1 a hydraulic unit and hydraulic circuit is known. This hydraulic unit is operated by means of a manual pump unit. A compensation device in the form of a membrane and the hydraulic tank are located in the extension of the cylinder housing.

From the DE G 92 15 062 is a spreading device with interchangeable expanding jaws, which form a triangular spreading contour. The expanding jaws are locked to the swivel arms on the device by means of removable bolts, which means that these expanding jaws can only be replaced very slowly.

From the US 8,727,317 B2 is known a working device in the form of a hydraulic spreader for accident cars, which has a hydraulic cylinder, a pump and a battery. The hydraulic tank and the compensation device are arranged around the hydraulic cylinder.

Object of the present invention

The object of the present invention is to provide a generic working device which enables an expanded working area.

Solution of the task

The above object is achieved by a hydraulic working device according to the features of claim 1. Appropriate embodiments of the invention are claimed in the subclaims.

The fact that every second tool half has a wall-shaped section that extends perpendicular to the extension of the longitudinal axis of the piston rod, and that both sections together form a flattened end region that extends perpendicular to the extension of the longitudinal axis of the piston rod and that forms a common flattened end region To use implement advantageously for spreading front door or house window columns. In comparison to conventional hand tools, the implement according to the invention with the specially designed tool thus enables very quick access to apartments or houses.

The flattened end region is advantageously offset laterally to extend the longitudinal axis of the piston rod. As a result, the flattened end area can be inserted into a door gap without any problems, for example if the door gap is in the immediate vicinity of a door frame.

Alternatively or additionally, the flattened end region can be oriented obliquely to extend the longitudinal axis of the piston rod. As a result, the flattened forehead area can be inserted more easily into a door gap in unfavorable space conditions.

Both second tool halves widen towards the piston rod. Preferably, a second tool half comprises a wall area that runs at an angle to the level of the flattened end area and the center line of the Extension of the piston rod cuts. This wall area supports the opening movement of the door or window.

The tip of the flattened end region expediently has a slope. This makes it easier for the flattened end region to penetrate into a particularly narrow door gap. The bevel in particular also makes it easier to turn the flattened forehead area into a narrow door gap.

By virtue of the fact that the second tool halves are arranged so that they engage in one another in the area of the flattened end region, a particularly narrow, flattened end region can be achieved on the one hand, since the second tool halves do not "double" in this region. On the other hand, due to the special shape of the second tool half, sufficient force can still be applied to the door gap.

The tool according to the invention advantageously has at least one flat, anvil-like wall section at its end opposite the end region. This wall section serves as a stop surface in order to actively drive the flattened end region of the tool, for example with an ax or a hammer, into the door gap. This can be very advantageous if the gap is too small to penetrate with the flattened forehead area. By applying an external force, a quick penetration into the door gap is still possible.

At least one of the flat wall sections advantageously has a contour in the form of a knurl. A crowbar can be attached to this contour so that the attached crowbar can be struck with a hammer or an ax. The contour has the advantage that the crowbar does not slip off the wall section when force is exerted by means of a hammer or ax.

According to the invention, the second tool halves can be plugged onto the first tool halves. This enables the tools to be exchanged particularly quickly during use.

Accordingly, the door opener tool described above is designed in such a way that it can be plugged onto these first tool halves. Both halves of the tool (namely those that are plugged on and those that are plugged on) each have a tool function, namely a spreading or cutting tool function.

In order to ensure the fastest possible tool exchange, a coupling is expediently provided for plugging and unplugging the second tool halves from the first tool halves, which comprises a locking element which can be locked or unlocked with a large, plate-shaped actuating element. The actuating element can also be operated with thick gloves and thus ensures a quick tool change.

The locking element is loaded with a spring and engages in a hole in the first tool half when the second tool half is plugged onto the first tool half. The spring holds the locking element in position after the second tool half has been plugged onto the first tool half. This ensures that the tool halves are not separated from one another during work. The tool halves can be quickly separated or pulled off by actuating the actuating element.

The actuating element expediently has a preferably annular projection which is arranged opposite a corresponding bore. When the actuating element is actuated, the projection is pushed into the bore and the locking element located there is sunk into the bore. This enables trouble-free operation.

It is advantageous that there is a bevelled edge at the beginning of the second half of the tool. When the second tool halves are plugged onto the first tool halves, the beveled edge causes the locking element to be countersunk in the bore against the force of the spring. The locking element then remains in this hole until the first half of the tool has been pushed into the second half of the tool until the locking element has reached the hole in the coupling. The locking element is pushed up by the force of the spring, whereby the tool halves are locked.

According to the invention, the first tool halves serving as receptacles have a, preferably toothed, cutting contour.

This is particularly advantageous, for example, if a cable and / or a security chain has to be cut through in doors.

A further expedient embodiment of the implement consists in that the compensation device and the hydraulic tank are integrated together in the pump housing. This guarantees a particularly space-saving and weight-reducing design of the implement.

The pump housing expediently has a cover which, together with the pump housing, forms a space in which the compensation device, for example in the form of a rubber membrane, is located and, depending on the work situation, can extend into this space. This configuration is structurally particularly simple.

A holder for a lighting unit is expediently located on the pump housing. This is useful when using the implement in complete darkness, e.g. B. by a SEK or in poor visibility. In this way, the operator can be guaranteed at least some illumination of the work area.

The lighting unit preferably has its own energy supply. The separation of the energy supply has the advantage that the battery for the pump cannot be used up by the lighting unit.

Description of the invention using an exemplary embodiment

Fig. 1

eine Längsschnittdarstellung einer ersten Ausgestaltung eines hydraulischen Arbeitsgerätes gemäß der Erfindung;

Fig. 2

eine Darstellung in Draufsicht auf die Ausgestaltung des hydraulischen Arbeitsgerätes gemäß Fig. 1;

Fig. 3

eine perspektivische Darstellung der Ausgestaltung des hydraulischen Arbeitsgerätes gemäß Fig. 1 mit geöffneten Werkzeughälften;

Fig. 4

eine Darstellung in Draufsicht auf eine zweite Ausgestaltung des hydraulischen Arbeitsgerätes, die nicht Gegenstand der Erfindung ist;

Fig. 5

eine perspektivische Darstellung der Ausgestaltung des hydraulischen Arbeitsgerätes gemäß Fig. 4 mit geöffneten Werkzeughälften;

Fig. 6

eine perspektivische Darstellung des Pumpengehäuses einschließlich des Steuerventils des hydraulischen Arbeitsgerätes gemäß der Erfindung;

Fig. 7

eine Schnittansicht durch den Hydrauliktank des hydraulischen Arbeitsgerätes gemäß der Erfindung;

Fig. 8a

eine Schnittdarstellung im Bereich der Verbindung zwischen erster Werkzeughälfte und zweiter Werkzeughälfte in verriegeltem Zustand;

Fig. 8b

eine Schnittdarstellung im Bereich der Verbindung zwischen erster Werkzeughälfte und zweiter Werkzeughälfte in entriegeltem Zustand sowie,

Fig. 8c

eine Schnittdarstellung im Bereich der Verbindung zwischen erster Werkzeughälfte und zweiter Werkzeughälfte bei teilweise abgezogener zweiter Werkzeughälfte.

An expedient embodiment of the present invention is explained in more detail below with reference to drawing figures. Show it:

Fig. 1

a longitudinal sectional view of a first embodiment of a hydraulic implement according to the invention;

Fig. 2

a representation in plan view of the design of the hydraulic implement according to Fig. 1 ;

Fig. 3

a perspective view of the design of the hydraulic implement according to Fig. 1 with the mold halves open;

Fig. 4

a representation in plan view of a second embodiment of the hydraulic working device, which is not the subject of the invention;

Fig. 5

a perspective view of the design of the hydraulic implement according to Fig. 4 with the mold halves open;

Fig. 6

a perspective view of the pump housing including the control valve of the hydraulic working device according to the invention;

Fig. 7

a sectional view through the hydraulic tank of the hydraulic working device according to the invention;

Fig. 8a

a sectional view in the region of the connection between the first tool half and the second tool half in the locked state;

Fig. 8b

2 shows a sectional illustration in the area of the connection between the first tool half and the second tool half in the unlocked state, and

Fig. 8c

a sectional view in the area of the connection between the first tool half and the second tool half with the second tool half partially removed.

Reference number 1 in Fig. 1 denotes the hydraulic portable implement according to the invention in its entirety. The implement 1 comprises a motor housing 39, a pump housing 10, a cylinder housing 22 and a door-opening tool on the end face, which is driven by the implement. An electric motor 23 for driving a hydraulic pump 2, which is accommodated in the pump housing 10, is located in the motor housing 39. A main switch 27 is provided on the motor housing 39 for switching the implement 1 on and off. A battery 9 is used as the energy source and is inserted into a shaft on the underside of the motor housing 39 in a detachable manner.

Reference numeral 8 denotes a control valve in the form of a so-called "star valve", which serves to control the direction of flow of the hydraulic fluid and thus the working movement of the tool (opening or closing).

A first cylinder space 46a and the second cylinder space 46b are located in the cylinder housing 22 and are separated from one another by the piston of a piston rod 11. The piston is in Fig. 1 in its front end position. A hollow rod 5 is fixedly arranged on the pump housing 10 so that hydraulic fluid can reach the second cylinder chamber 46b from the hydraulic pump 2. A bore 47 for receiving the hollow rod 5 during the movement of the piston rod 11 and a passage opening 42 for the hydraulic fluid into the second cylinder space 46b are provided in the piston rod 11.

The end of the piston rod 11 facing away from the pump housing 10 is connected via a deflection mechanism to two swivel arms 12, 13 which, depending on the direction of movement of the piston rod 11, spread apart or pivot towards one another. The reference number 52 denotes a retaining bolt which simultaneously forms the pivot axis of the two pivot arms 12, 13.

The two swivel arms 12, 13 are formed on their end facing away from the bolt 52 as first tool halves 18, 19, onto which second tool halves 16, 17 are attached.

In the exemplary embodiment, the second tool halves 16, 17 together form a door opener tool.

Fig. 1 also shows riser brackets 26, 33 which serve to attach a riser (not shown) to the implement 1. Furthermore, a handle 31 is provided on the implement 1.

Reference numeral 25 denotes a holder for a lighting device (not shown). The lighting device is preferably equipped with its own energy supply.

The two second tool halves 16, 17 form a door or window opener tool. For this purpose, the second tool halves 16, 17 each comprise a vertically extending wall-like section 20, 21 with changing wall thickness. These two sections 20, 21 form on their front side in the closed state of the two second tool halves 16, 17 a flattened end region 24 which runs perpendicular to the extension of the longitudinal axis of the piston rod 11. The end region 24 serves to be inserted into a front door gap or a house window gap , It enables the door opener tool to be inserted and the force to be optimally introduced into the gap. The two second tool halves 16, 17 have, on the rear side opposite the flattened end region 24, flat wall sections 20a, 21a with increased material thickness, which serve as a stop surface for a hammer (not shown) or an ax (not shown) or as a contact surface for a ( also not shown) rod or a crowbar serve as a stop extension.

The flattened forehead area 24 is in the design after Fig. 1 formed by a plurality of flattened wall sections 20b and 21b each of the second tool halves 16, 17, which engage in a finger-like and flush manner when the second tool halves 16, 17 are closed. As a result, a flattened end region 24 is formed, the vertical of which is larger than the diameter of the cylinder housing 22. The door opener tool thus offers an ideal introduction of force into a door or window gap.

According to Fig. 2 the flattened end region 24 of the two second tool halves 16, 17 is arranged laterally offset to the longitudinal axis A of the implement 1 or the piston rod 11. In addition, if necessary, the flattened end region 24 can be slightly inclined to extend the longitudinal axis A. This configuration enables the implement 1 to be used effectively even in confined spaces, for example in a door frame located close to a door gap.

The front tip of the flattened end region 24 has a bevel 34 which makes it possible to press the tip of the tool into a narrow door or window gap using force.

On the vertical to the plane of the drawing Fig. 2 running wall sections 21a and 20a, a hammer or an ax can be struck or a stop extension provided for this purpose can be attached. Reference numeral 32 denotes a cover of the two swivel arms 12, 13 of the implement.

Fig. 3 shows the door opener tool in the open state. The two second tool halves 16, 17 of the door opener tool are plugged onto the two first tool halves 18, 19. The first tool halves 18, 19 form a preferably toothed cutting contour 37, 38 (cf. also Figure 5 ), which makes it possible to cut a door chain after opening the door or window using the door opener tool.

Out Fig. 3 it can also be seen that in the area of the flattened or planar wall section 20a of the second tool half 16 a preferably transversely extending non-slip contour 40a, 40b, e.g. B. is provided in the form of a knurl. It is intended for a stop extension, such as. B. a crowbar, experiences a hold when hammered in and does not slip. In addition, the second tool half 16 has a wall area 41 between the flattened rear area and the individual front wall sections 20b, which is angled to the latter and serves as a stop in use.

Fig. 4 shows an embodiment of a working device 1 not belonging to the invention, in which on the front of the working device 1 instead of the door opener tool according to the embodiment 1 to 3 there is a spreading tool with a triangular outer contour. This expanding tool has two tool halves 16, 17 and is also attached to the two tool halves 18, 19 in the manner already described. The type of locking is the same as who in the design of the 1 to 3 , The toothed cutting contour 37, 38 of the two tool halves 18, 19 is clearly visible.

The tool halves 16, 17 have, as from Fig. 5 can be seen in the outer area an outer surface 49, 50, which may preferably be provided with a profile. Furthermore, the two tool halves 16, 17 each have a contact surface 35, 36 on the inside, which can also have a profile. The contact surface 35, 36 is penetrated by a cutting contour 44, 45 which extends to the tip of the two tool halves. The cutting contour 44, 45 is preferably straight and can also easily protrude beyond the plane of the contact surfaces 35, 36. The cutting contour 44, 45 can also, as from Fig. 5 can be seen in the extension of the cutting contour 37, 38 of the two tool halves 18, 19, on which the tool halves 16, 17 are attached.

The representation according to Fig. 6 shows a partial view of the pump housing 10, the control valve 8 without a motor housing with an inserted, partially covered electric motor 23. The pump housing 10 has a ring-like projection 51, which serves to ensure a connection of the cylinder housing 22 to the pump housing 10. Also visible is the hollow rod 5 on the pump housing 10, which also serves as a line for the hydraulic fluid to the second cylinder space 46b. Numeral 6 designates further hydraulic lines that run from the pump housing 10 into the first cylinder space 46a (cf. Fig. 1 ) lead to.

The implement according to the invention has a hydraulic tank 4 which is accommodated in the pump housing 10. For this purpose, the pump housing 10 comprises an opening which can be closed by a cover 7 and in which there is a compensating device, for example in the form of a cup-shaped rubber membrane 30. The cover 7 can be connected to the pump housing 10 by means of screws. The holder 25 for the lighting unit to be attached is located on the top.

Fig. 7 shows an enlarged view of the tank 4 of the implement. As can be seen from this, the cover 7 forms, together with the pump housing 10 underneath, a compensation space 43, in which the compensation device in the form of, for example, the rubber membrane 30 extends more or less depending on the position of the hydraulic cylinder 3. The pump housing 10 thus comprises a tank 4, which at the same time represents the compensation volume 43 for the rubber membrane 30. As a result, the weight of the implement can be reduced considerably. In the cover 7 there is an opening 48 which allows air to escape into the compensation space 43 when the rubber membrane 30 expands.

Fig. 8 shows enlarged partial representations of a coupling 28 for manual locking and unlocking of the second tool halves 16, 17 to be plugged onto the first tool halves 18, 19 in different states. The locked tool halves are in Fig. 8a , the unlocked tool halves in Fig. 8b and the tool halves in the state of insertion or removal in Fig. 8c shown.

Fig. 8a shows the first tool half 18, which is inserted into a recess 65 of the second tool half 16. In Fig. 8a the locked state is shown, in which the second tool half 16 and the first tool half 18 are firmly connected to one another by the coupling 28. The coupling 28 comprises a large-area, plate-shaped actuating element 56, which is located in a recess 57, a ring 58 (see Fig. 8b ) and a locking element 53. The locking element 53 is located in a bore 54 of the first tool half 18 and is biased by a spring 55 in the direction of the actuating element 56.

In the embodiment shown here, the actuating element 56 has a, preferably annular, projection 60, which cooperates with a correspondingly annular recess 62, so that the actuating element 56 can be pressed. The actuating element 56 expediently has a further central projection 67, which lies opposite a bore 66 on the second tool half 16. The bore 66 is expedient to create space for the locking element 53 for locking the second and first tool halves 16, 18. The projection 67 serves to sink the locking element 53 out of the bore 66 against the force of the spring 55 into the bore 54 when the actuating element 56 is actuated. This allows the clutch 28 to be unlocked. In addition to the bore 66 there is an annular projection 61. The projection 61 is opposite a corresponding recess 63 in the actuating element 56. The projection 61 is sunk into this recess 63 when the actuating element 56 is actuated. A guidance of the actuating element 56 is thereby achieved.

In Fig. 8b the unlocked state is shown. Here, the locking element 53 is completely countersunk in the bore 54 and the actuating element 56 is pressed in by the operator. The actuating element 56 has an annular recess 59 on the outside. In the locked position ( Fig. 8a ) the recess 59 is filled by the ring 58 and thus an actuating plane of the actuating element 56 which is flush with the surface of the tool 18 is reached.

In Fig. 8c it is clarified how the second tool half 16 is plugged onto the first tool half 18 and how these can be separated from one another. The locking element 53 is pressed out due to the force of the spring 55 when the first tool half 18 is pulled out of the recess 65 at the beginning of a beveled edge 64 located on the second tool half 16. The beveled edge 64 serves as a run-on bevel when the second tool half 16 is slipped onto the first tool half 18, the locking element 53 being pressed into the bore 54 when being pushed through the beveled edge 64 and then being immersed in the bore 54 when it reaches the bore 66. As a result, the second tool half 16 is locked with the first tool half 18.

The implement according to the invention is characterized by a low weight and small dimensions. Furthermore, it offers a very high variability in use and is therefore particularly suitable as an accompanying tool for firefighters with the possibility of quick access to a building. Likewise, the working device according to the invention is very particularly suitable for the use of SEK.

LIST OF REFERENCE NUMBERS

1

implement

2

hydraulic pump

3

hydraulic cylinders

4

hydraulic tank

5

hollow bar

6

hydraulic line

7

cover

8th

control valve

9

battery pack

10

pump housing

11

piston rod

12

swivel arm

13

swivel arm

16

Second half of the tool

17

Second half of the tool

18

First half of the tool

19

First half of the tool

20

section

20a

wall section

20b

wall section

21

section

21a

wall section

21b

wall section

22

cylinder housing

23

electric motor

24

Flattened forehead area

25

Bracket for lighting unit

26

Strap bracket

27

main switch

28

clutch

29

clutch

30

rubber membrane

31

handle

32

protective cover

33

Strap bracket

34

slope

35

contact area

36

contact area

37

cutting contour

38

cutting contour

39

motor housing

40a

contour

40b

contour

41

wall area

42

Port

43

compensating volume

44

cutting contour

45

cutting contour

46a

First cylinder room

46b

Second cylinder room

47

drilling

48

lid opening

49

outer surface

50

outer surface

51

ring-like projection

52

bolt

53

locking element

54

drilling

55

feather

56

actuator

57

recess

58

ring

59

recess

60

head Start

61

head Start

62

recess

63

recess

64

beveled edge

65

recess

66

drilling

67

head Start

Claims (13)

1. Hydraulic work apparatus (1) for portable use, having
   a hydraulic pump (2), a pump housing (10),
   a hydraulic cylinder (3) with a piston rod (11),
   a hydraulic tank (4), hydraulic lines, a compensator and a manually operable, hydraulic control valve (8),
   a rechargeable battery (9) accommodated on the work apparatus (1),
   two, first and second tool halves (18, 19 and 16, 17, respectively) connected to the piston rod (11) via pivot arms (12, 13), wherein the second tool halves ensure a spreading function,
   each tool half (16, 17) has a wall portion (20, 21) extending perpendicularly to the extension of the longitudinal axis of the piston rod (11), and both wall portions (20, 21) jointly form, in the closed state of the two tool halves, a flattened end region (24) extending perpendicularly to the extension of the longitudinal axis of the piston rod (11), and
   the second tool halves (16,17) engage in one another in the region of the flattened end region (24), characterized in that,
   in order to spread doors and window gaps, the second tool halves (16, 17) have a plurality of wall portions (20b, 21b) which, located one above another, form the flattened end region (24),
   the second tool halves (16, 17) are pluggable onto the first tool halves (18,19), and
   the first tool half (18,19) has a cutting contour (37, 38).
2. Work apparatus according to Claim 1, characterized in that the flattened end region (24) is offset laterally with respect to the extension of the longitudinal axis of the piston rod (11).
3. Work apparatus according to Claim 1 or 2, characterized in that the flattened end region (24) is oriented in a manner extending in an inclined manner with respect to the extension of the longitudinal axis of the piston rod (11).
4. Work apparatus according to at least one of the preceding claims, characterized in that the tip of the flattened end region (24) has a bevel (34).
5. Work apparatus according to at least one of the preceding claims, characterized in that the portion (20, 21) has at least one flattened wall portion (20a, 21a) at its opposite end from the end region (24).
6. Work apparatus according to Claim 5, characterized in that at least one flattened wall portion (e.g. 20a) has at least one contour (40a, 40b) in the form of a knurl.
7. Work apparatus according to Claim 1, characterized in that a manual coupling (28, 29) that is actuable without tools is provided between the second tool halves (16, 17) and the first tool halves (18, 19).
8. Work apparatus according to Claim 1 or 7, characterized in that a preferably spring-loaded locking element (53) is accommodated in a bore (54) in each of the second tool halves (16, 17), and the first tool halves (18, 19) each comprise a, preferably plate-like, actuating element (56) for the locking element (53).
9. Work apparatus according to Claim 8, characterized in that the actuating element (56) has a protrusion (67), which is located opposite a bore (66) in the first tool halves (18, 19), and the bore (66) serves to receive the locking element (53) in the locking state.
10. Work apparatus according to one of Claims 1, 7-9, characterized in that the first tool half (18, 19) has a bevelled edge (64), which serves as a run-on slope for the locking element (53).
11. Work apparatus according to at least one of the preceding claims, characterized in that the first tool half (18, 19) has a toothed cutting contour (37, 38).
12. Work apparatus (1) according to one of the preceding claims, characterized in that the compensator and the hydraulic tank (4) are located in the pump housing (10).
13. Work apparatus (1) according to one of the preceding claims, characterized in that a holder for an illumination unit (25) is located on the pump housing (10).

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