EP3164561B1 - Sash/leaf lift - Google Patents

Description

The present invention relates to a wing lifter for a window, a door or the like, which has a frame and a movable frame with respect to the frame, wherein the wing lifter comprises a designed for attachment to the frame or the wing body and a mounted on the base support lever which is pivotable relative to the main body between a pivoted position and a pivoted position and cooperates via a contact portion with a arranged on the other element of the frame and wing support member that strikes the wing when the wing on the frame, the support member meets the contact portion of the pivoted support lever , whereby the support lever is pivoted into the pivoted position and is supported in the pivoted position by raising the wing on the support element.

Especially with heavy window and door wings, it comes after prolonged use often to a drooping over the ideal position. This can go so far that when closing the window, the lower edge of the wing strikes the frame. By lifting the wing in the closed state of the window by means of a wing lifter bearing the wing bearing are relieved, so that even after prolonged use good operability of the window or door is ensured. The base body and the support element can be designed in particular for screwing onto a fitting element of the frame or of the wing.

For a wing lifter to work correctly, the positions of the base body and the support element must be exactly matched. This is usually done by manual adjustment after installation of the window or door. The adjustment process is time consuming and annoying. Sometimes the adjustment is therefore simply omitted, so that the assembled wing lifter is ineffective. The user will not notice this at first because the bearings will give way gradually over a longer period of time.

DE 200 10 653 U1 discloses a wing lifter according to the preamble of claim 1.

It is an object of the invention to provide a wing lifter whose functionality is ensured even without manual adjustment.

The object is achieved by a wing lifter with the features of claim 1.

According to the invention, a bearing axle carrying the support lever is displaceable relative to the base body for adapting the height position of the contact section, wherein a conversion device is provided which causes the bearing axis to be displaced in an adjustment direction when the support lever is pivoted in the direction of the swung-in position during pivoting of the support lever Direction of the pivoted position, however, prevents a displacement of the bearing axis against the adjustment.

The setting is thus done by pivoting the support lever, so that no operation of a setting is required. The fact that the bearing axis is adjusted only when pivoting the support lever, but not when swinging, the adjustment is always in one direction. The bearing axis is thus moved when closing the wing in an adjusted position and retains this adjusted position in a renewed opening of the wing. The adjustment of the altitude of the contact portion thus takes place after installation of the wing lifter during normal use of the window or the door. The wing lifter it's self-adjusting. This frees the fitter of the annoying adjustment work and ensures that even if omitted setting a correct function of the sash lifter is guaranteed.

Preferably, the adjustment direction is oriented such that moves in a displacement of the bearing axis in the adjustment of the contact portion of the support lever from the body away. This means, for example, that the adjustment direction points upward starting from the base body upwardly projecting support lever. The adjustment thus takes place in the sense that the contact portion is moved to the support element. The mounting positions of the main body and of the support element can then be selected such that the contact section is removed by a slight amount too far from the support element and approaches it by pivoting the support lever this. The undesirable situation of an abutting between the contact portion and the body on the support lever support member is excluded in this way.

The bearing axle may comprise a sliding guide section which is guided in a guide slot of the basic body extending in the adjustment direction. The guide slot can in this case run straight or slightly curved. The sliding guide section may be a pin-like projection which protrudes from an axial end face of the bearing axis. To reduce the friction, the bearing axis could also be performed by means of a roller in the guide slot.

According to the invention, the conversion device comprises a one-way clutch which acts between the support lever and a transmission element displaceably acting on the bearing axis. The one-way clutch ensures that a pivoting of the support lever is connected only in one direction, namely in the direction of the pivoted position, with a sliding movement of the bearing axis.

Preferably, means for separating the one-way clutch are provided to prevent further displacement of the bearing axis after it has reached the desired correct position.

A further embodiment of the invention provides that the bearing axis is passed through an elongated hole formed in the support lever and the support lever in a decoupling position, in which the bearing lever is displaced in the slot by a coupling position in which the support lever is coupled to the transmission element the coupling between the support lever and the transmission element is canceled, can be transferred. The displacement of the support lever can take place in the form of a loading of the contact portion by the support member, so that therefore the support lever is moved due to a run-up of the wing on the frame in the decoupling position. The decoupling of support lever and transmission element is thus effected by closing the window or the door itself and does not have to be triggered separately.

Preferably, the support lever is biased by a spring means in the coupling position. This ensures that an adjustment of the bearing axis takes place during each pivoting operation, provided that the support element does not press the support lever against the spring force in the decoupling position.

The spring device can be effective between the support lever and the bearing axis or between the support lever and a stationary abutment of the body. For example, could be provided as a spring means a leg spring, in which a leg is held firmly in the base body and the other leg acts on the support lever. Another embodiment provides a helical compression spring, which is supported on the one hand on the outside of the bearing axis and on the other hand on the inner axis of a slot through which is passed through the bearing axis. Such springs can simultaneously serve to bias the support lever to the pivoted position.

According to one embodiment of the invention, a coupling gear portion is arranged with asymmetrical tooth flanks on a circumferential surface of the bearing axis, in which engages at at least one arranged on an inner wall portion of the elongate hole engaging element such as a tooth or pawl when befindlichem in the coupling position support lever. Due to the interaction of gear portion and engagement element is similar to a ratchet or ratchet a constant adjustment of the bearing axis when pivoting the support lever without return adjustment when swiveling causes. In principle, the arrangement could also be reversed, that is, the coupling gear portion with asymmetrical tooth flanks could be arranged on the inner wall portion of the slot and the engagement member could be arranged on the peripheral surface of the bearing axis.

The bearing axis preferably abuts an end portion of the slot when the support lever is in the decoupling position. The arrangement of bearing axis and support lever so accomplished the desired support while raising the wing.

According to a further embodiment of the invention, the contact portion has a curved or angled stop surface for the support element, in particular such that upon impact of the support member on a first portion of the stop surface a pure pivotal movement of the support lever in the direction of the pivoted position and upon impact of the support member in addition to a different from the first region of the second area of the stop surface is a displacement movement of the support lever relative to the bearing axis. As a result of a displacement movement of the support lever relative to the bearing axis decoupling of support lever and transmission element - So ultimately a separation of the one-way clutch - takes place, decides the position of the support member relative to the contact portion of a termination of the adjustment process. As long as therefore the support element impinges on the first region of the stop surface, there is a further adjustment of the bearing axis. However, as soon as the support element impinges on the second region of the stop surface, the support lever is pressed at each Einschwenkvorgang in the decoupling position and there is no further adjustment of the bearing axis. The adjustment process is thus automatically stopped as soon as the altitude of the contact section has reached a desired ideal value.

The conversion device may comprise a transfer gear section, which is coupled to the bearing axle or formed on this and meshes with a base body fixed rack section. An arrangement of gear portion and rack section allows a structurally particularly simple and cost-effective implementation of a pivoting movement of the support lever in a sliding movement of the bearing axis.

The transfer gear section and / or the base body-fixed rack section may have rounded teeth. This ensures smooth rolling of the gear section on the rack section.

The conversion device may comprise an adjusting screw, which is received in a threaded portion of the base body and acted upon the shaft end bearing axis, wherein on the set screw, a first bevel gear portion is arranged, which is engageable with a provided on the support lever second bevel gear portion in engagement, wherein the first bevel gear portion and / or the second bevel gear portion have asymmetrical tooth flanks. The advantage of a set screw is in particular that it can be used if necessary for a manual adjustment.

In particular, an externally accessible handwheel for manual displacement of the bearing axis can be provided on the screw. If the base body is executed like a box, it preferably has at least one recess, which allows access to the handwheel. In such an embodiment, a fitter may, for example, use the handwheel for coarse presetting, the fine adjustment then being accomplished by closing the sash during normal use of the window or door.

Further developments of the invention are indicated in the dependent claims, the description and the accompanying drawings.

Fig. 1

ist eine Perspektivansicht eines Flügelhebers gemäß einer ersten Ausführungsform der Erfindung.

Fig. 2

ist eine Rückansicht des Flügelhebers gemäß Fig. 1.

Fig. 3

zeigt den in Fig. 2 dargestellten Flügelheber ohne hintere Abdeckplatte.

Fig. 4

zeigt den in Fig. 2 dargestellten Flügelheber mit eingeschwenktem Stützhebel.

Fig. 5

zeigt den in Fig. 2 dargestellten Flügelheber mit in einer Mittelstellung befindlichen Lagerachse.

Fig. 6

ist eine Perspektivansicht eines Flügelhebers gemäß einer zweiten Ausführungsform der Erfindung.

Fig. 7

ist eine Vorderansicht des Flügelhebers gemäß Fig. 6 ohne vordere Abdeckplatte.

Fig. 8

zeigt den in Fig. 7 dargestellten Flügelheber mit eingeschwenktem Stützhebel.

Fig. 9

zeigt den Flügelheber gemäß Fig. 8 in einem verstellten Zustand, wobei sich eine Lagerachse des Flügelhebers in einer oberen Endstellung befindet.

The invention will now be described by way of example with reference to the drawings.

Fig. 1

is a perspective view of a wing lifter according to a first embodiment of the invention.

Fig. 2

is a rear view of the wing lifter according to Fig. 1 ,

Fig. 3

shows the in Fig. 2 illustrated wing lifter without rear cover plate.

Fig. 4

shows the in Fig. 2 illustrated wing lifter with pivoted support lever.

Fig. 5

shows the in Fig. 2 illustrated wing lifter located in a mid-position bearing axis.

Fig. 6

is a perspective view of a wing lifter according to a second embodiment of the invention.

Fig. 7

is a front view of the wing lifter according to Fig. 6 without front cover plate.

Fig. 8

shows the in Fig. 7 illustrated wing lifter with pivoted support lever.

Fig. 9

shows the wing lifter according to Fig. 8 in an adjusted state, wherein a bearing axis of the wing lifter is in an upper end position.

The in Fig. 1-5 shown wing lifter 17 is used for lifting a door or window sash, not shown, when it is in a closed position on the associated frame. The wing lifter 17 includes in a basically known manner a base body 19 and a pivotally mounted on the base body 19 supporting lever 21. The base body 19 has fastening holes 20 for passing screws, by means of which the base body 19 can be fastened to the window frame. A formed at the free end of the support lever 21 contact portion 23 cooperates with a support member 25 which is designed for attachment to the wing. In the illustrated embodiment, the support member 25 is a simple cylindrical bolt. In principle, however, the support element 25 may also have a more complex design and / or be designed in several parts. It is also understood that, in principle, the base body 19 on the wing and the support member 25 may be mounted on the frame.

In the Fig. 1 shown position of the support lever 21 corresponds to a swung-out position. An in 3 and 4 visible leg spring 45 ensures that the support lever 21 is biased in this swung-out position. In contrast, the in Fig. 4 illustrated position in which a longitudinal axis L ( Fig. 4 ) of the support lever 21 extends parallel to the wing plane of the door or window sash, a pivoted position. When the window or the door is closed and the wing runs accordingly on the window frame, the support member 25 meets the contact portion 23 of the pivoted support lever 21 and pushes it into the pivoted position. In the pivoted position, the support lever 21 is supported by a slight increase in the wing on the support member 25 from.

As in Fig. 1-5 can be seen, the support lever 21 is supported by a bearing shaft 27 which is displaceable relative to the base body 19. Specifically, a guide slot 29 is formed on a front side of the here half-shell-like base body 19, which extends in a direction of displacement V. A provided on the bearing shaft 27 sliding guide portion 31 is received in the guide slot 29 and slidable in this and in the opposite direction of the shift V. Regardless of the relative displaceability between the bearing axis 27 and the base body 19 and the support lever 21 is relative to the bearing axis 27 slidably. For this purpose, a slot 35 is formed in the support lever 21 through which the bearing shaft 27 is passed. A carriage 77 serves to guide the displaceable in the direction of displacement V components.

When the support lever 21 as in Fig. 4 is shown in the pivoted position, the slot 35 also extends in the direction of displacement V. At an inner wall portion 37 of the slot 35 is a tooth 38 which cooperates with a formed on the bearing shaft 27 coupling gear portion 39. As in 3 and 4 can be seen, the tooth 38 and the coupling gear portion 39 on asymmetrical tooth flanks. If the bearing axis 27 as in Fig. 3 shown abuts on the inner wall portion 37, the tooth 38 engages in the coupling gear portion 39 and the support lever 21st is in a coupling position in which a common pivoting of the bearing shaft 27 and support lever 21 is provided. The leg spring 45 biases the support lever 21 in the coupling position. If the bearing axis 27, however, as in Fig. 4 shown on the tooth 38 opposite inner wall portion 47 of the slot 35 abuts, the tooth 38 does not engage in the coupling gear portion 39 and the support lever 21 does not take the bearing axis 27 with a pivoting.

At an axial end face of the bearing shaft 27 opposite the sliding guide section 31, a transfer gear section 49 is provided, which in the illustrated embodiment comprises only three teeth. Depending on the application, the transfer gear section 49 can be formed directly on the bearing axle 27 or can be designed as a separate component and be coupled with the bearing axle 27 in an effective manner. As in Fig. 2 can be seen, the transfer gear portion 49 meshes with a base body fixed rack portion 50, which is formed here on the side wall of a slot 51. The slot 51 is formed in a rear cover plate 53 which is fixed to the base body 19. An untoothed portion 54 of the bearing shaft 27 lying opposite the transfer gear portion 49 is similar to the sliding guide portion 31 of a sliding guide of the bearing axis 27 in the base body 19. The teeth of the transfer gear portion 49 and of the rack fixed portion 50 are rounded as shown, to a smooth To ensure intervention.

Upon rotation of the bearing axis 27 of the transfer gear portion 49 rolls on the base body fixed rack portion 50 and the bearing shaft 27 moves within the slot 51. In the Fig. 2 to 4 the bearing axis 27 is shown in each case in an upper end position in which it abuts the upper end of the slot 51 and the distance of the contact portion 23 from the bearing axis 27 is maximum. If the bearing axis 27 as in Fig. 5 not shown in the upper end position, it can be turned by twisting Fig. 5 be moved counterclockwise upwards. Such a rotation of the bearing shaft 27 in the counterclockwise direction can be accomplished by a Einschwenkbewegung of the support lever 21, provided that the tooth 38 is in engagement with the coupling gear portion 39. Due to the action of the leg spring 45, this engagement is always at frei swung out support lever 21st

When mounting the sash lifter 17 on the window frame of the window or the door is taken to ensure that the contact portion 23 is in the basic body near end position. The contact portion 23 has a curved stop surface 55 with a first, at an acute angle to the direction of displacement V extending portion 56 and a second, located in the apex of curvature 57. When the support member 25 is incident on the first portion 56, the pivot lever 21 is in the pivoted position according to Fig. 4 moves, wherein the bearing shaft 27 is rotated due to the engagement between the tooth 38 and the coupling gear portion 39 and the transfer gear portion 49 rolls on the base body fixed rack portion 50. As a result, the bearing shaft 27 is moved in the direction of displacement V with a corresponding change in the altitude of the contact portion 23. In a subsequent opening of the wing, the leg spring 45 ensures that the support lever 21 swings out again. Due to the asymmetric tooth flanks of tooth 38 and coupling gear portion 39, however, the support lever 21 does not take the bearing axis 27 during the swiveling movement. Rather, the tooth 38 ratchets the teeth of the coupling gear portion 39 with a slight displacement of the support lever 21 relative to the bearing axis 27. The shifted in the direction of displacement V bearing axis 27 is thus not moved back when renewed pivoting of the support lever 21, but remains at its adjusted position , The process is repeated, if necessary, in subsequent closing operations of the wing, wherein the bearing axis 27 each time by a predetermined Amount is moved further. That is, the support lever 21 continues to move out of the main body 19 during use of the window.

However, as soon as the support lever 21 is extended so far out of the main body 19 that the support element 25 impinges on the second region 57 of the stop surface 55, the support lever 21 is pushed into the decoupling position prior to pivoting. This happens because when an impact of the support member 25 on the second portion 57 of the stop surface 55 is transmitted in the direction of the bearing axis 27 facing force component that is sufficient to overcome the force of the leg spring 45. The support lever 21 is then pivoted in, without the bearing axis 27 pivots. Accordingly, there is also no displacement of the bearing axis 27 in the adjustment direction V. The bearing axis 27 has reached its end position. This end position is chosen such that the support lever 21 is supported in the pivoted position by raising the wing on the support member 25. It is understood here that the support lever 21 could also be mounted downwardly from the base body 19 projecting on the frame or on the wing.

Overall, the arrangement of tooth 38, coupling gear portion 39, transfer gear portion 49 and rack portion 50 is a conversion device 60, which causes a pivoting of the support lever 21 in the direction of the pivoted position, a displacement of the bearing axis 27 in the adjustment direction V, upon pivoting the support lever 21 in the direction of the pivoted position, however, a displacement of the bearing axis 27 against the adjustment direction V prevents. The curved abutment surface 55 of the contact portion 23, in conjunction with the bearing lever 27 slidable relative to the support lever 21 ensures that the displacement of the bearing axis 27 in the adjustment direction V only takes place up to a predetermined end position and is then prevented. The displacement of the bearing axis 27 up to the end position takes place by repeatedly opening and closing the wing during normal use the window or the door, so that the wing lifter 17 is in the end self-adjusting. If desired, however, a manual adjustment of the wing lifter 17 can be done by the bearing shaft 27 is rotated by a tool. In Fig. 1 By way of example, a recess 75 provided in the bearing axis 27 for engagement of a hexagon socket wrench is shown.

In order to prevent that due to a support of the support lever 21 relative to the base body 19, a torque is exerted on the transfer gear section 49 and thus a return movement of the bearing shaft 27, the leg spring 45 is designed and arranged such that a leg end 46 as in Fig. 2-4 recognizable engages the coupling gear portion 39 and the bearing shaft 27 thereby holds in its current rotational position. If, due to a desired manual adjustment of the wing lifter 17, a tool is introduced into the recess 75, this acts on the leg end 46 and pushes it out of engagement with the coupling gear section 39, so that a rotation of the bearing axis 27 can take place.

The Fig. 6-9 show an alternative embodiment of a wing lifter 17 'according to the invention, in which the base body 19 and the support lever 21 are designed similar to the wing lifter 17 according to Fig. 1-4 , The conversion device 60 'is here by a set screw 61 ( Fig. 6-8 ), which has a threaded portion 63 and with its shaft end 65, the bearing axis 27 is applied. By means of a rotatably mounted in the main body, engaging with the threaded portion 63 and accessible from the outside handwheel 67, a user can tighten the screw 61 so as to move the bearing shaft 27 manually upwards - for example, from the FIGS. 7 and 8 shown middle position in the in Fig. 9 shown upper end position. In the opposite direction, a helical compression spring 69 ensures that when the adjusting screw 61 is loosened, the bearing shaft 27 is moved downwards. At the front end of the shaft 65 of the adjusting screw 61 is a first bevel gear portion 70, which is engageable with a provided on the support lever 21 second bevel gear portion 71 into engagement. In the embodiment shown, the second bevel gear portion 71 has only two teeth. The bevel gear portions 70, 71 each have asymmetrical tooth flanks.

When the support lever 21 as in Fig. 6 and 7 shown in the coupling position, the bevel gear portions 70, 71 engage each other and each Einschwenkvorgang the set screw 61 is rotated by a certain amount. As a result, the front shaft end 65 of the adjusting screw 61 moves in the adjustment direction V, ie in FIG Fig. 7 upwards, and thus pushes the bearing axis 27 in a correspondingly adjusted position. In a subsequent pivoting of the support lever 21 of the second bevel gear portion 71 slides under a slight displacement of the support lever 21 relative to the adjusting screw 61 via the first bevel gear portion 70, so that a turning back of the screw 61 and thus a backward displacement of the bearing shaft 27 is prevented. The automatic pivoting of the support lever 21 is effected by the helical compression spring 69. This is like in Fig. 8 and 9 recognizable when swiveling with respect to its screw axis laterally deformed, resulting in a corresponding lateral - and thus pivoting acting - component of the restoring force. The helical compression spring 69 is dimensioned such that this pivoting component of the restoring force is greater than the support lever 21 relative to the bearing axis 27 displacing component of the restoring force, since the latter must be overcome during pivoting, so that the second bevel gear portion 71 slip over the first bevel gear portion 70 can. The in the Fig. 6-9 shown wing lifter 17 'is therefore also self-adjusting, which in turn can be done on request, a manual adjustment via the handwheel 67. In Fig. 8 and 9 the wing lifter 17 'is shown in an end position in which it unfolds its supporting effect. The support lever 21 is in this case in a decoupling position. Fig. 9 shows a state in which the adjusting screw 61 maximum is adjusted and the bearing shaft 27 is accordingly in an upper end position.

When using a wing lifter 17, 17 'according to the invention, the mechanic is freed from annoying and time-consuming adjustments. In addition, it is ensured that a correct setting is not accidentally omitted.

LIST OF REFERENCE NUMBERS

17, 17 '

sash lift

19

body

20

mounting hole

21

support lever

23

Contact section

25

support element

27

bearing axle

29

guide link

31

slide guide

35

Long hole

37

Inner wall section

38

tooth

39

Coupling gear portion

45

Leg spring

46

leg end

47

Inner wall section

49

Relaying gear portion

50

Rack section

51

Long hole

53

cover

54

untoothed area

55

stop surface

56

first area

57

second area

60, 60 '

Transcriber

61

screw

63

threaded portion

65

shank end

67

handwheel

69

Helical compression spring

70

first bevel gear section

71

second bevel gear section

75

recess

77

carriage

79

stop surface

L

longitudinal axis

V

adjustment

Claims (14)

1. A leaf lifter (17, 17') for a window, for a door or the like which has a frame and a leaf movable with respect to the frame, wherein the leaf lifter (17, 17') comprises a base body (19) configured for fastening to the frame or to the leaf; and a support lever (21) which is supported at the base body (19), which is pivotable with respect to the base body (19) between a pivoted out position and a pivoted in position and which cooperates via a contact section (23) with a support element (25) arranged at the other one of the frame and leaf such that, on a running of the leaf onto the frame, the support element (25) impacts the contact section (23) of the pivoted out support lever (21), whereby the support lever (21) is pivoted into the pivoted in position and is supported at the support element (25) in the pivoted in position on the raising of the leaf,
   characterized in that
   a support axle (27) carrying the support lever (21) is displaceable with respect to the base body (19) to adapt the vertical position of the contact section (23), with a conversion device (60, 60') being provided which effects a displacement of the support axle (27) in an adjustment direction (V) on a pivoting of the support lever (21) in the direction of the pivoted in position and which, in contrast, suppresses a displacement of the support axle (27) against the adjustment direction (V) on a pivoting of the support lever (21) in the direction of the pivoted out position, with the conversion device (60, 60') comprising a one-way coupling (38, 39, 70, 71) effective between the support lever (21) and a transmission element (49, 61) displaceably acting on the support axle (27).
2. A leaf lifter in accordance with claim 1,
   characterized in that
   the adjustment direction (V) is oriented such that the contact section (23) of the support lever (21) moves away from the base body (19) on a displacement of the support axle (27) in the adjustment direction (V).
3. A leaf lifter in accordance with claim 1 or claim 2,
   characterized in that
   the support axle (27) comprises a slide guide section (31) which is guided in a guide slot (29) of the base body (19) extending in the adjustment direction (V).
4. A leaf lifter in accordance with any one of the preceding claims,
   characterized in that
   means are provided for separating the one-way coupling (38, 39, 70, 71).
5. A leaf lifter in accordance with any one of the preceding claims,
   characterized in that
   the support axle (27) is led through an elongate hole (35) formed in the support lever (21) and the support lever (21) can be moved, on the displacement of the support axle (27) in the elongate hole (35), from a coupling position in which the support lever (21) is coupled to the transmission element (49, 61) into a decoupling position in which the coupling between the support lever (21) and the transmission element (49, 61) is canceled.
6. A leaf lifter in accordance with claim 5,
   characterized in that
   the support lever (21) is preloaded into the coupling position by means of a spring device (45, 69).
7. A leaf lifter in accordance with claim 6,
   characterized in that
   the spring device (45, 69) is effective between the support lever (21) and the support axle (27) or between the support lever (21) and a fixed-position abutment of the base body (19).
8. A leaf lifter in accordance with any one of the claims 5 to 7,
   characterized in that
   a coupling toothed wheel section (39) having asymmetrical tooth flanks is arranged at a peripheral surface of the support axle (27) and at least one engagement element (38) arranged at an inner wall section (37) of the elongate hole (35), such as a tooth or a pawl, engages into said coupling toothed wheel section (39) when the support lever (21) is located in the coupling position.
9. A leaf lifter in accordance with any one of the claims 5 to 8,
   characterized in that
   the support axle (27) abuts an end section (47) of the elongate hole (35) when the support lever (21) is located in the decoupling position.
10. A leaf lifter in accordance with any one of the preceding claims,
    characterized in that
    the contact section (23) has a curved or angled abutment surface (55) for the support element (25), in particular such that a pure pivot movement of the support lever (21) in the direction of the pivoted in position takes place when the support element (25) impacts a first region (56) of the abutment surface (55) and a displacement movement of the support lever (21) with respect to the support axle (27) additionally takes place when the support element (25) impacts a second region (57) of the abutment surface (55) which is different from the first region (56).
11. A leaf lifter in accordance with any one of the preceding claims,
    characterized in that
    the conversion device (60) comprises a conversion toothed wheel section (49) which is coupled to the support axle (27) or is formed thereat and which meshes with a gear rack section (50) fixed to the base body.
12. A leaf lifter in accordance with claim 11,
    characterized in that
    the conversion toothed wheel section (49) and/or the gear rack section (50) fixed to the base body has/have rounded teeth.
13. A leaf lifter in accordance with any one of the preceding claims,
    characterized in that
    the conversion device (60') comprises an adjustment screw (61) which is received in a threaded section (63) of the base body (19) and whose shaft end (65) acts on the support axle (27), with a first bevel gearing section (70) being arranged at the adjustment screw (61) and being able to be brought into engagement with a second bevel gearing section (71) provided at the support lever (21), with the first bevel gearing section (70) and/or the second bevel gearing section (71) having asymmetrical tooth flanks.
14. A leaf lifter in accordance with claim 13,
    characterized in that
    a hand wheel (67) accessible from the outside is provided at the adjustment screw (61) for a manual displacement of the support axle (27).

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