EP3303207B1 - Lifting gear - Google Patents

Description

The invention relates to a hoist, in particular a lever hoist, which has a traction mechanism drive and a traction mechanism which can be moved by the traction mechanism drive according to the features in the preamble of claim 1.

Such a hoist is through the DE 41 05 050 A1 known. The hoist shown there, which is also called pull stroke, essentially consists of an upper fastening element and a lower stop element, which are indirectly connected to one another via a housing. The stop element is connected via a traction mechanism to a traction mechanism drive which is located in the housing of the hoist. The traction mechanism drive can be set in rotation within the housing by moving a swivel arm. This makes it possible to move an object or to pull a traction device around an object.

For this purpose, the lever arm engages in a gear mechanism, which in turn is connected to the traction mechanism and so the traction mechanism is set in motion by a pivoting movement of the lever arm. Depending on the position of the user, the lever arm is often not in an ergonomically favorable position.

The US 2,343,884 A discloses a hoist which has a traction mechanism drive and a traction mechanism which can be moved by the traction mechanism drive, the traction mechanism drive being operable by a pivotably arranged lever arm. In the area of the free end of the lever arm, a handle is connected to the lever arm via a joint, the handle being pivotable from an initial position into an operating position.

Starting from the prior art, the invention has for its object to provide an application-technically and ergonomically improved hoist, which should simplify use even with heavy loads.

This object is achieved according to the invention in the features of claim 1.

Advantageous developments of the invention are the subject of claims 2 to 9.

The hoist, in particular a lever train, has a traction mechanism drive and a traction mechanism which can be moved by the traction mechanism drive, the traction mechanism drive being actuable by a pivotably arranged lever arm.

The traction mechanism drive is mounted in a housing, at least one fastening element and one stop element being indirectly coupled to the housing.

The housing is at least partially open. This means that the housing is formed by two sheets formed parallel to a longitudinal axis of the hoist, which are connected to one another via a frame construction. The measure contributes to a light and simple construction.

The housing can also be closed except for the necessary openings for the traction means and for connecting the fastening element.

The traction mechanism drive is located within the housing and is connected to a lever arm via a gear arrangement known from the prior art. By pivoting the lever arm, it is possible to actuate the traction mechanism and thus to move the traction mechanism located therein. The traction device is preferably a chain or a rope or wire. The traction mechanism drive is then preferably formed by a chain wheel or a cable drum, which is connected to the lever arm via a gear arrangement. The traction means designed as a chain can be moved via the chain wheel.

By pivoting the lever arm, a rotary movement is transmitted via the gear to the traction mechanism, so that the traction mechanism can be moved by the traction mechanism.

At the free end of the lever arm, a handle is connected to the lever arm via a joint, the handle being pivotable from an initial position into an operating position. As soon as the user deems it expedient, he can pivot the handle out of its starting position into an operating position. This allows the user to grip the lever arm differently and operate it better, i. H. Forces are transferred to the hoist in an ergonomically advantageous manner. Furthermore, the swivel range of the hand lever can be better used.

The handle can be pivoted from its starting position into several operating positions. This makes it possible to be able to react to application-specific requirements, for example to enable operation by a left-handed or right-handed person.

According to the invention, the lever arm has a recess in which the handle is arranged in its starting position. This makes it possible to make the hoist compact so that it takes up little space when not in use.

The handle can be arranged between two spaced webs of the lever arm. A pivot axis for the handle can extend between the webs.

In addition, a further embodiment provides that only one web is provided on the lever arm and that the handle is arranged next to the web. Each after the design of the joint, the handle can be pivoted about one or two axes.

If the handle is in its folded starting position, this is advantageous not only for storage but also for moving the hoist from one place to another. If the handle is in the starting position, the hoist according to the invention is like a hoist known from the prior art, i. H. can be used without additional handgrip and takes up little space. The handle is only pivoted from its starting position into an operating position when it is necessary.

According to a preferred embodiment of the lifting device according to the invention, the handle can be displaced around a pivot axis of the joint, which is arranged at an angle, in particular at an angle of 90 °, to a longitudinal axis of the lever arm. By arranging the handle around a pivot axis perpendicular to the longitudinal axis of the lever arm, the handle is positioned so that it is easy to grip, so that an optimized introduction of force into the traction mechanism drive can take place.

The handle is preferably designed as a hollow handle body, the handle body being at least indirectly fixable with respect to the joint by means of an internal spring. By designing the handle in the form of a hollow handle body, it is possible to protect the internal spring from dirt and / or corrosion. The handle is moved against the spring force. The spring force always acts in the direction of the joint.

The grip body can be guided over a sleeve on a coupling element, the sleeve being displaceable along the coupling element. The use of the sleeve within the handle body creates a connection in the form of a plain bearing. It enables the combination of plastic handles with metal sleeves. The spring extends along the coupling element. Because the sleeve is displaceable along the coupling element, the entire handle can be displaced along the coupling element.

The joint preferably has a bearing body and a fixing element, the fixing element reaching through the bearing body and the coupling element and thus establishing the pivotable connection between the bearing body and the coupling element. The direction of movement of the handle is determined by the orientation of the fixing element, i. H. determines the pivot axis. In particular, the handle can be moved out of the lever arm into a position parallel to the pivot axis of the lever arm.

The spring is arranged within the handle body between the sleeve and an abutment body, the spring pressing the sleeve against the bearing body of the joint. An unintentional shifting of the handle relative to the joint can be avoided, since the preset tension force of the spring has to be overcome in order to be able to shift the handle relative to the joint.

According to a further embodiment of the invention, it is provided that the bearing body has a recess and the sleeve engages in the recess of the bearing body via a centering projection, a releasable non-positive and / or positive connection being able to be established.

An opening can be provided at a free end of the handle body, which receives a closure body. The closure body makes the handle body easier to manufacture, in particular if it is an injection molded part made of plastic.

Figur 1

eine perspektivische Ansicht des erfindungsgemäßen Hebezeuges, bei dem sich der Handgriff in der Ausgangsposition befindet,

Figur 2

eine perspektivische Ansicht des erfindungsgemäßen Hebezeuges, bei dem der Handgriff in eine erste Betriebsposition verschwenkt ist,

Figur 3

eine perspektivische Ansicht des erfindungsgemäßen Hebezeuges, bei der der Handgriff in eine zweite Betriebsposition verschwenkt ist,

Figur 4

einen Querschnitt durch die x-z-Ebene des freien Endes des Hebelarmes in Blickrichtung des Pfeils IV in Figur 1, wobei der Handgriff in seiner Ausgangsposition angeordnet ist,

Figur 5

einen Querschnitt durch die x-y-Ebene des freien Endes des Hebelarmes in Blickrichtung des Pfeils V in Figur 1, wobei der Handgriff in einer Ausgangsposition angeordnet ist,

Figur 6

einen Querschnitt durch die x-y-Ebene des freien Endes des Hebelarmes in Blickrichtung des Pfeils VI in Figur 2, wobei der Handgriff in die erste Betriebsposition verschwenkt ist,

Figur 7

einen Querschnitt durch die x-y-Ebene des freien Endes des Hebelarmes in Blickrichtung des Pfeils VII in Figur 3, wobei der Handgriff in die zweite Betriebsposition verschwenkt ist.

The invention is explained below with reference to an embodiment shown in the drawings. Show it:

Figure 1

2 shows a perspective view of the lifting device according to the invention, in which the handle is in the starting position,

Figure 2

2 shows a perspective view of the lifting device according to the invention, in which the handle is pivoted into a first operating position,

Figure 3

2 shows a perspective view of the lifting device according to the invention, in which the handle is pivoted into a second operating position,

Figure 4

a cross section through the xz plane of the free end of the lever arm in the direction of arrow IV in Figure 1 , the handle being arranged in its starting position,

Figure 5

a cross section through the xy plane of the free end of the lever arm in the direction of arrow V in Figure 1 , the handle being arranged in a starting position,

Figure 6

a cross section through the xy plane of the free end of the lever arm in the direction of arrow VI in Figure 2 , wherein the handle is pivoted into the first operating position,

Figure 7

a cross section through the xy plane of the free end of the lever arm in the direction of arrow VII in Figure 3 , wherein the handle is pivoted into the second operating position.

In the Figures 1 , 2 and 3 1 designates a variant of the lifting device 1 according to the invention. The hoist 1 has an upper fastening element 2 and a lower stop element 3, which are connected to one another at least indirectly via a housing 4. In the present embodiment variant, the housing 4 has two plates 5, 6 and a frame 7. A traction mechanism drive 8 is arranged inside the housing 4, via which a traction mechanism, not shown, can be moved. The lower stop element 3, which can be displaced with the traction means, is arranged on this traction means.

The lever arm 9 is connected via a handwheel 10 to a shaft and a gear arrangement, not shown. The pivoting movement of the lever arm 9 is translated into a rotational movement of the traction mechanism drive 8 via the gear arrangement, as a result of which the traction mechanism is moved. The lever arm 9 has a recess 12 at its free end 11. A handle 13 is in a starting position 14 within the recess 12 and is coupled to the lever arm 9 via a joint 15. Furthermore, an adjusting unit 16 is arranged on the lever arm 9 and is able to set the free-wheeling direction of the lever arm 9.

The handle 13 is received in a starting position 14 between two webs S1, S2 of the lever arm. The webs S1, S2 enclose the recess 12 on two sides.

Figure 2 shows that the handle 13 is in a first operating position 17 at the free end 11 of the lever arm 9. The handle 13 is pivoted out of the recess 12 between the webs S1, S2 in the image plane to the left into the first operating position 17 by 90 °.

The Figure 3 shows the hoist 1 according to the invention from the Figures 1 and 2nd , but the handle 13 is pivoted from the recess 12 between the webs S1, S2 into a second operating position 18 in the image plane by 90 ° to the right.

The in the Figures 2 and 3 The embodiment variants shown allow a user to be able to operate the lifting device 1 according to the invention or the handle 13 connected to it via a joint 15 with both the left and the right hand, without having to change its position in relation to the lifting device 1. The user can thus maintain an optimal position for executing the pivoting movement of the lever arm 9.

Furthermore, in the Figure 4 a sectional view along the longitudinal axis L of the lever arm 9 is shown, wherein the handle 13 is arranged in the recess of the free end 11 of the lever arm 9 in the starting position 14. The coordinate systems in the figures show the position of the cutting planes.

The sectional view shows that the handle 13 has a hollow handle body 19. The hollow handle body 19 receives an internal spring 20 which is coupled to the joint 15 via a coupling element 21 and a sleeve 22. In the embodiment variant according to the Figure 4 the joint 15 is formed by a bearing body 23, a fixing element 24 passing through the bearing body 23 and the coupling element 21 and pivotally connecting them to one another. The angle W between the longitudinal axis L of the lever arm 9 and the pivot axis SA of the joint 15 is 90 ° here, as a result of which an ergonomic grip position is achieved.

Im in the image plane of the Figures 3 and 4th An abutment 25 is arranged in the upper region of the handle 13. The handle body 19 is supported circumferentially on the abutment 25. The preload of the spring 20 can be adjusted via the size and position of the abutment 25. In this embodiment, the abutment 25 is integrally formed with the coupling element 21 in the same material. The preload is now set. In addition, in the Figure 4 an opening 27 located in the handle body 19 is shown, in which a closure body 26 of the handle body 19 is arranged. The closure body 26 closes the handle body 19 at the end.

In Figure 5 is a 90 ° pivoted sectional view of the free end 11 of the lever arm 9 according to the Figure 4 shown. The fixing element 24 is passed both through the bearing body 23 of the joint 15 and through the coupling element 21 and connects them to one another. The force exerted by the spring 20 in the direction of force F, which extends in the direction of the image from top to bottom along the longitudinal axis L of the lever arm 9, presses the grip body 19 into its starting position 14 via the sleeve 22.

The Figure 6 shows the position of the handle 13 in a first operating position 17, wherein the handle 13 is in a horizontal orientation relative to the bearing body 23 and extends to the left in the image plane. The sleeve 22 is in the first operating position 17 in engagement with a first recess 28 of the bearing body 23. The sleeve 22 is pressed into the first recess 28 by the spring 20 and is held there in a positive and non-positive manner via its centering projection 30. In the embodiment variant shown, the force of the spring 20 extends from the left side of the image in the direction of force F to the right side of the image. The recess 12 between the webs S1, S2 of the lever arm 9 is not blocked and can thus be used as a point of attack for the second hand of the user.

Figure 7 shows the handle 13 in its second operating position 18, the handle 13 being arranged horizontally in the image direction on the right opposite the bearing body 23. The sleeve 22 of the handle 13 is pressed into the second recess 29 of the bearing body 23, centered by the spring 20, and is non-positively and positively in the second recess 29 in the second operating position 18 held. Here, too, the cutout 12 between the webs S1, S2 of the lever arm 9 is not blocked and thus also enables the user to intervene with his second hand. The direction of force F of the force applied by the spring 20 runs in the direction of the image from right to left.

Reference numerals:

1 -

Hoist

2 -

Fastener

3 -

Stop element

4 -

casing

5 -

Plate to 4

6 -

Plate to 4

7 -

Frame to 4

8th -

Traction drive

9 -

Lever arm

10 -

Handwheel

11 -

free end to 9

12 -

Recess

13 -

Handle

14 -

Starting position

15 -

joint

16 -

Adjustment unit

17 -

Operating position

18 -

Operating position

19 -

Handle body

20 -

feather

21 -

Coupling element

22 -

Sleeve

23 -

Bearing body

24 -

Fixing element

25 -

Abutment

26 -

Closure body

27 -

Opening to 19th

28 -

first recess to 23

29 -

second recess to 23

30 -

Centering approach

F -

Direction of force

L -

Longitudinal axis to 9

S1 -

Bridge to 9

S2 -

Bridge to 9

SA -

Swivel axis to 15

W -

angle

Claims (9)

1. Lifting gear (1), in particular lever hoist, which has a traction means drive (8) and a traction means movable by the traction means drive (8), wherein the traction means drive (8) can be activated by a pivotably arranged lever arm (9) and in the area of the free end (11) of the lever arm (9) a handle (13) is connected via an articulated joint (15) to the lever arm (9), wherein the handle (13) is pivotable from a starting position (14) into an operating position (17), characterised in that the lever arm (9) has a recess (12) and the handle (13) is arranged in its starting position (14) in the recess (12).
2. Lifting gear according to claim 1, characterised in that the handle (13) can be moved around a pivot axis (SA) of the articulated joint (15), which is arranged at an angle (W), in particular at an angle of 90°, relative to a longitudinal axis of the lever arm (9).
3. Lifting gear according to claim 1 or 2, characterised in that the handle (13) is designed as a hollow gripping body (19), wherein the gripping body (19) can be secured by an interior spring (20) at least indirectly relative to the articulated joint (15).
4. Lifting gear according to claim 3, characterised in that the gripping body (19) is connected via a sleeve (22) to a coupling element (21), wherein the sleeve (22) can be displaced along the coupling element (21).
5. Lifting gear according to claim 4, characterised in that the articulated joint (15) has a bearing body (23) and a fixing element (24), wherein the fixing element (24) extends through the bearing body (23) and the coupling element (21) and forms a pivotable connection between the bearing body (23) and the coupling element (21).
6. Lifting gear according to claim 4, characterised in that the spring (20) is arranged inside the gripping body (19) between the sleeve (22) and an abutment (25), wherein the spring (20) pushes the sleeve (22) against the bearing body (23) of the articulated joint (15).
7. Lifting gear according to claim 5 or 6, characterised in that the bearing body (23) has a recess (28, 29) and the sleeve (22) engages in the operating position in the recess (28, 29) of the bearing body (23), wherein a releasable force-fitting and/or form-fitting connection can be formed.
8. Lifting gear according to claim 6 or 7, characterised in that at the free end (11) of the gripping body (19) an opening (27) is provided which receives a closure body (26).
9. Lifting gear according to any of claims 4 to 8, characterised in that the sleeve (22) has a centring edge (30).

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