DE102019104886B4 - workshop crane - Google Patents

Abstract

Workshop crane (1) with a chassis (10) and a crane structure (50), - the chassis (10) in the area of a front end (11) and a rear end (12) each having at least one wheel (15, 16, 17) having, and- wherein the crane structure (50) has a mast (60) which is connected in the region of its lower end (62) via a mast base (63) to the chassis (10), and- wherein the crane structure (50) has a Cantilever (80),- wherein in the region of the rear end (12) a hand drawbar (30) is fixed to the chassis (10),- wherein the chassis (10) has a longitudinal crossbar (14) which extends between the front end ( 11) and the rear end (12), characterized in that the boom (80) is connected to the mast (60) in the region of an upper end (61) of the mast (60), and on the boom (80) a load pick-up (81) is arranged, - the mast base (63) has a mast shoe (64) which is connected to the chassis (10) or which, with the involvement of a loading of the chassis (10), - the mast shoe (64) or parts thereof is detachably connected to the longitudinal crossbar (14) of the chassis (10) via bolts (68), and - the longitudinal crossbar (14) along its length at least has two different positions for fixing holes (19) for the bolts (68), and the mast shoe (64) can be optionally fixed in one of the at least two positions on the longitudinal beam (14) or can be formed with the integration of the longitudinal beam (14).

Description

The invention relates to a workshop crane according to the preamble of claim 1.

Workshop cranes are used to lift heavy objects in workshops. For example, is off DE 20 2012 008 504 U1 a workshop crane is known which has a V-shaped chassis on which a crane structure is fixed. For this purpose, a mast of the crane structure is connected to the chassis in the area of the tip of the V-shape of the chassis. A mast base is provided for this purpose, ie a receiving bearing, via which the mast is connected to the chassis.

At the upper end of the mast, the crane structure has a horizontally aligned jib which extends centrally above the free ends of the V-shape of the chassis. It is therefore an underriding workshop crane, because the chassis extends below the load, so that the center of gravity of the load is within the extension of the chassis.

Such an underriding workshop crane is very light and therefore easy to handle. However, such an underriding workshop crane has the disadvantage that it cannot be used with loads that do not allow underriding. Another disadvantage is the high structure, which makes it difficult to stow the workshop crane when not in use.

Furthermore, the workshop crane has a trolley for fixing a load pick-up, which is slidably mounted on the jib. The disadvantage of this is that the trolley can be set in motion by a load on the load hook when lifting in the direction of the free tip of the jib, either by bending or by shunting accelerations. The trolley and load can then fall.

Another disadvantage is that a user has to push against either the load or the mast to maneuver. This is uncomfortable and can also cause the workshop crane to topple over.

In DE 11 21 295 B a workshop crane is specified with a chassis which is designed in the form of a fork. A hand drawbar with a rotatable wheel is arranged at the closed end of the chassis. Support wheels sit at the open end. A ballast box and a mast with a boom are arranged on the chassis. To fix them on the chassis, vertical bores are formed at the closed end and at the open end of the chassis, to which either the ballast box or the mast base can be screwed. This allows the workshop crane to be converted from a counterweight crane to an undercarriage crane.

Out of DE 85 21 095 U1 a movable and collapsible crane with a chassis and a crane structure is known. At its rear end, the chassis has a hand drawbar on a swiveling wheel. There are also wheels at the front end. The crane structure has a mast which is pivoted with a mast foot in a mast shoe. The mast shoe is formed on the chassis in the area of the rear end.

EP 0 506 245 A2 specifies a collapsible crane with a chassis and a crane body. The crane structure has a mast with a mast foot, the mast foot being pivotably mounted on a mast shoe on the chassis.

In U.S.A. 4,144,973 describes a workshop crane that has a fork-shaped chassis with a crane assembly at the closed end. The mast is firmly connected to the chassis here.

US 2007/0 056 922 A1 teaches a crane kit made up of different components, from which different types of cranes without counterweights can be constructed, including an underriding crane or a gantry crane.

The object of the invention is to develop a workshop crane that can be used as flexibly as possible for different lifting processes, is easy to handle and achieves a high degree of safety when lifting loads. The solution should also be inexpensive and reliable. Space-saving storage when not in use is also preferably taken into account.

The object is achieved by the features specified in claim 1.

Advantageous configurations are the subject matter of dependent claims 2 to 12.

The invention relates to a workshop crane with a chassis and a crane structure. The chassis has at least one wheel in the area of a front end and a rear end. The crane structure has a mast which is connected to the chassis in the region of its lower end via a mast base. The crane structure also has a boom which is connected to the mast in the region of an upper end of the mast and on which a load pick-up, e.g. a load hook, is arranged. It is provided that a hand tiller is fixed to the chassis in the area of the rear end. The chassis has a longitudinal beam that extends between the front end and the rear end. The base of the mast has a mast shoe which is connected to the chassis or which is formed incorporating a region of the chassis, the mast shoe or parts thereof being detachably connected to the longitudinal cross member of the chassis via bolts. The longitudinal beam has fixing holes for the bolts in at least two different positions along its length, and the mast shoe can be fixed in one of the at least two positions on the longitudinal beam or can be formed with the integration of the longitudinal beam.

An advantage of this workshop crane is the comfortable and safe maneuverability of the chassis using the hand drawbar, especially with and without a load. Of course, this applies in particular to variants in which the workshop crane does not have a drive motor. Such motorless workshop cranes are inexpensive to purchase and maintain. The hand drawbar can have a handle bar and a handle. The hand tiller is preferably designed to be telescopic in terms of its length. This makes it more compact when not in use and the hand drawbar can also be adapted to different user sizes.

In a special embodiment, the chassis has a crossbar at the front end, which is aligned transversely to the extension between the front end and the rear end. This achieves a high level of stability, particularly against lateral tipping. The crossbeam should be geodetically aligned horizontally. All directional information given in connection with the invention is to be understood in the case of an intended construction on a geodetically straight subsoil. The crossbeam can have a square tube or at least essentially consist of it. Square tubes can be procured as inexpensive semi-finished products and are very rigid. Two of the wheels should be spaced apart from each other on the cross member, preferably at each end of the cross member. This achieves a wide installation area and secures the workshop crane against tipping over. The two wheels on the crossbeam can, for example, be fixed or swivel castors, which optionally have a parking brake. Such rollers are hard, so the crane stands up firmly. Parking brakes can be used to prevent unintentional rolling away, because workshop floors often have a slight incline for draining liquids or the like.

Furthermore, the chassis has a longitudinal cross member that extends between the front end and the rear end. This longitudinal traverse should be geodetically aligned horizontally. Inexpensive production with high rigidity succeeds when the longitudinal cross member has a square tube or at least essentially consists of it.

The optional transverse traverse is preferably arranged on the face side in front of the longitudinal traverse, so that these preferably form a T-shape. This provides a stable three-point support, with which the crane body is secured against tipping over. In order to achieve a high load-bearing capacity, the crossbeam and the longitudinal beam should be firmly connected to one another, preferably with a material connection, e.g. welded to one another. One of the wheels is preferably arranged in the area of the rear end on the longitudinal beam. This means that the wheel is as far out as possible and the contact area of the chassis is large.

Preferably, the wheel at the rear end is a castor, which can optionally have a parking brake. The workshop crane can be maneuvered in tight spaces thanks to the interaction of the steering roller and the hand drawbar. The parking brake can also be actuated in the area of the hand drawbar, so that maneuvering can be ended directly by setting the parking brake and the workshop crane cannot start moving unintentionally.

The chassis should be flat, preferably no more than half as high as it is wide, and more preferably no more than one third as high as it is wide. This enables the load to be driven under easily, e.g. an engine in an engine compartment. The width refers to the transverse direction and the length to the longitudinal direction of the chassis. These in turn can relate to the horizontal extension of the boom.

According to a special embodiment, the mast is detachably connected to the chassis in the area of its lower end via the mast base. The loosening can be used, for example, for a compact storage size, e.g. for space-saving stowage or for easy transport.

According to a special embodiment, the workshop crane is designed in such a way that in the region of the rear end of the chassis, a weight receptacle is formed, via which one or more weights can be releasably connected to the chassis. On the one hand, this achieves a high level of stability thanks to a low center of gravity, and on the other hand, the load at the front end can also hang in front of the chassis without the workshop crane tipping over. For this purpose, the load before the front end of the Fahrge stells be arranged. For ease of use, the one or more weights can each have a handle. Preferably, the one or more weights are each designed as a weight disk. These can be easily moved and are also often used in workshops for other weights when they are not needed on the workshop crane. A particularly safe handling of the weights is achieved if they are designed to be stacked one on top of the other.

In a special variant of the workshop crane, it is provided that it can be converted from a counterweight crane to an underriding workshop crane. This achieves a particularly high degree of flexibility. On the one hand, loads that can be driven under can be lifted in a confined space with the workshop crane variant, and maneuverability is made easier if the unnecessary weights are removed from the workshop crane. On the other hand, heavy loads that cannot be driven under can also be picked up by using the counterweight crane variant. The necessary counterweight can preferably be set by the number of weights.

For training as a counterweight crane, the mast foot should be able to be fixed in the area of the front end on the chassis. In particular, this allows loads to be lifted that sit on the ground in front of the front end of the chassis or that cannot be driven under with the chassis for any other reason. The boom should extend forwardly over the front end of the chassis, preferably more than half its length when oriented horizontally.

Furthermore, the workshop crane should be designed for training as an underriding workshop crane in such a way that the mast foot can be fixed to the chassis in the area of the rear end. This allows loads to be driven under with the chassis and the load to be lifted above the footprint of the chassis. For this purpose, the boom should extend at least with the essential part of its length between the front end and the rear end of the chassis, in particular above it. As a result, the center of gravity of the load is above the contact area. In an optional embodiment, the foot of the mast is fixed in the area of the rear end and to form a workshop crane driving underneath in the area of the weight absorption. In any case, a stable structure is required to hold the weights, which can then be used to fix the mast at the same time. Because counterweights are not absolutely necessary for undercarriage cranes, there is a variant according to which the weights are to be removed for the training of the underriding workshop crane. This means that the workshop crane variant that drives underneath is easy to manoeuvre.

Furthermore, it is provided that the mast base has a mast shoe which is connected to the chassis or which is formed incorporating a region of the chassis. A stable connection is created by a mast shoe. A mast shoe is to be understood as a support element which provides a space for the mast between two opposite parts, in particular similar to a post shoe. The mast shoe or parts thereof is detachably connected to the chassis, namely its longitudinal beam, via bolts, preferably screw bolts. The mast shoe can thus be repeatedly dismantled/provisioned. In a special design, the mast shoe has two vertically aligned and opposite side plates. Due to the side plates, the mast shoe can be manufactured inexpensively and can derive large torques from the load bearing into the chassis.

The mast is preferably fixed in the region of its lower end between the two opposite side plates, preferably by means of bolts, in particular screw bolts. This creates a stable connection. For easy stowage and transport, there is a further development in which the mast in the mast shoe is pivoted about one of the bolts when the other bolt or bolts are loosened.

Furthermore, the longitudinal traverse can be fixed between the two opposite side plates, namely preferably by means of bolts, in particular screw bolts. This also results in a stable connection. By simply attaching the side plates to the longitudinal beam, the mast shoe is formed incorporating a portion of the chassis.

A particularly high level of stability with low weight is achieved if the opposite side plates of the mast shoe form tension struts which connect the mast on the opposite side of the boom to the chassis, preferably the longitudinal beam.

The longitudinal beam has fixing holes for the bolts in at least two different positions along its length, and the mast shoe can be fixed in one of the at least two positions on the longitudinal beam or can be formed with the integration of the longitudinal beam. This allows a simple conversion from an underpassing workshop crane to a reach counterbalanced crane and vice versa. The mast shoe can optionally be mounted to be longitudinally displaceable on the longitudinal beam when the bolts are loosened. This makes the conversion easier.

For a stable design, it is advisable if the longitudinal beam, the mast and the boom are in a common plane. The mast can be aligned slightly inclined towards the rear end, for example between 1 degree and 30 degrees and preferably between 5 degrees and 25 degrees. This increases stability.

The mast can have a square tube or at least essentially consist of it. Square tubes are stable and inexpensive as semi-finished products.

In an optional embodiment, the mast is mounted in a foldable manner on the chassis after releasing a safety device in the area of the mast foot, preferably in such a way that it can be folded down in the direction of the chassis. This means that it can be folded up when not in use and for transport. The fuse can be a bolt.

In a variant of the workshop crane, the jib is aligned horizontally, preferably non-adjustable or at most adjustable, and the load pick-up is fixed to a trolley, which is slidably mounted between two positions along the jib. The boom is therefore locked when the load is lifted. This means that the load can still be aligned during assembly if any of the chassis brakes are applied. In addition, the load can be pushed as close as possible to the mast for maneuvering, which means that the workshop crane is stable. The trolley preferably has rollers or pivot bearings with which it is mounted on the boom. This allows them to glide effortlessly along the boom. Optionally, the trolley has a parking brake, with which it can be secured against displacement on the boom. As a result, the trolley cannot move unintentionally, e.g. when driving over a bump. The jib preferably has two traveler stops between which the trolley is slidably mounted and which, in particular, block any further displacement. Furthermore, the trolley can have a hoist, for example a winch or a chain hoist, on which the load bearing is fixed.

The boom preferably has a square tube or even consists at least essentially of it. Square tubes have a high rigidity and are available as semi-finished products at low cost.

In a very special embodiment, the optional longitudinal beam, the mast and the boom are each made from a square tube, with their outer cross-sectional dimensions preferably being the same. The material thickness of the square tubes can be the same or different.

In an optional embodiment, after a safety catch has been released, the boom is mounted on the mast so that it can be folded down, preferably in such a way that it can be laid down on the mast. This allows the workshop crane to be folded up.

According to a further development, the boom is connected to the mast via a joint connector. Such allows the boom to pivot on the mast. Specifically, the articulating connector may include two vertically aligned and opposed side panels. Such side plates create a stable connection. The mast is preferably fixed in the area of its upper end between the two opposite side plates of the articulated connector, for example by means of bolts, in particular screw bolts. This is particularly stable and yet removable. Similarly, the cantilever can be fixed between the two opposite side plates of the articulated connector, preferably by means of bolts, in particular screw bolts. This connection is also stable. In a particular embodiment, the two opposite side plates are each T-shaped. This allows the boom to extend beyond the top of the mast, at least slightly (1%-20% of its length is meant here). This means that not only compressive forces are guided around the corner, but also tensile forces are transmitted on the unloaded side of the mast. Optional tension struts can also be formed/used here accordingly. This increases rigidity.

In a variant of the workshop crane that differs from the horizontally locked jib variant, it is provided that the jib is mounted on the mast so that it can pivot upwards and downwards, and an adjusting drive is provided for pivoting it upwards and downwards. With such cranes, even high loads can be lifted effortlessly. The actuator can be a lifting cylinder, for example, in particular a hydraulic cylinder.

• 1 eine perspektivische Ansicht eines Werkstattkranes, der als Gegengewichtskran ausgebildet ist;
• 2 eine perspektivische Ansicht eines Werkstattkranes, der als Gegengewichtskran ausgebildet und zusammengeklappt ist;
• 3 eine Seitenansicht eines Werkstattkranes, der als Gegengewichtskran ausgebildet und zusammengeklappt ist;
• 4 eine perspektivische Ansicht eines Werkstattkranes, der als die Last unterfahrender Werkstattkran ausgebildet ist.

Further features, details and advantages of the invention result from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. Show it:

• 1 a perspective view of a workshop crane, which is designed as a counterweight crane;
• 2 a perspective view of a workshop crane, which is designed as a counterweight crane and folded;
• 3 a side view of a workshop crane, which is designed as a counterweight crane and folded;
• 4 a perspective view of a workshop crane, which is designed as a workshop crane driving under the load.

1 shows a workshop crane 1 with a chassis 10 and a crane structure 50. The chassis 10 has at a front end 11 a crossbeam 13 made of a square tube, which is aligned geodetically horizontally when the workshop crane 1 is set up on level ground. A longitudinal beam 14 of the chassis 10 made of a square tube, which extends between the front end 11 and a rear end 12 of the chassis 10 , adjoins the transverse beam 13 . The longitudinal traverse 14 is also aligned geodetically horizontally when the workshop crane 1 is erected on level ground. As can be seen, the crossbeam 13 is arranged on the face side in front of the longitudinal beam 14, so that together they form a T-shape. In this case, the transverse beam 13 and the longitudinal beam 14 are firmly connected to one another, namely welded to one another.

The chassis 10 has two wheels 15, 16 in the area of the front end 11 and a third wheel 17 in the area of the rear end 12. The two wheels 15, 16 at the front end 11 are fixed at a distance from one another on the crossbeam 13 and are each designed as fixed rollers. The wheel 17 in the region of the rear end 12 is fixed to the longitudinal beam 14 and a castor with a parking brake 18. The wheels 15, 16, 17 can alternatively also be formed from adjacent twin wheels.

Due to this structure, the chassis 10 is flat, namely not even a third as high as it is wide. The length of the chassis is more than twice the width. The width refers to the transverse direction and the length to the longitudinal direction of the chassis 10.

The workshop crane 1 has no traction motor or other traction drive. Rather, it has a hand tiller 30 with a telescoping handle bar 31 and a handle 32 at the free end of the handle bar 31. The other end of the handle bar 31 is connected to the longitudinal crossbar 14 so that it can pivot about a horizontal axis. Alternatively, a connection to the suspension of the wheel 17 at the rear end 12 would be similar to a lift truck possible.

In the area of the rear end 12 of the chassis 10, a weight holder 40 is formed, by means of which a plurality of stacked weights 41, 42, 43 are detachably connected to the chassis 10. As can be seen in the center of the plate or disc-shaped weights 41, 42, 43, they have a square hole through which a vertically aligned square tube protrudes. The plate-shaped weights 41, 42, 43 are, so to speak, threaded onto it. At the lower end, the square tube of the weight holder 40 is connected to the longitudinal beam 14 so that the lowest weight rests on the longitudinal beam 14 . Each of the weights 41, 42, 43 has two handles 44 for easy handling.

The crane structure 50 has a mast 60 made of a square tube, which is detachably connected in the region of its lower end 62 via a mast base 63 to the chassis 10, in particular to its longitudinal beam 14. In addition, the crane structure 50 has a boom 80 made of a square tube, which is connected to the mast 60 in the region of an upper end 61 of the mast 60 and on which a load receiver 81 in the form of a load hook is arranged. The mast foot 63 is fixed or formed on the chassis 10 in the area of the front end 11 to form a counterweight crane, so that the boom 80 protrudes forward beyond the front end 11 of the chassis 10 . The longitudinal beam 14, the mast 60 and the boom 80 lie in a common plane which is aligned vertically.

The mast foot 63 has a mast shoe 64, the two side plates 65, 66 of which are detachably connected to the chassis 10 via bolts 68 to form the mast shoe 64. For this purpose, the longitudinal beam 14 has fixing holes 19 through which the bolts can be inserted. As can be seen, the mast shoe 64 has two vertically aligned and opposite side plates 65, 66. Optionally, these can be connected to one another with connecting webs of the mast shoe 64, so that a mast shoe would also be present when the mast shoe was removed. In the present case, however, the mast shoe 64 is formed with the integration of a region of the longitudinal cross member 14 . The longitudinal beam 14 is fixed between the two opposite side plates 65, 66, for which bolts 68 are preferably used as bolts.

Furthermore, the mast 60 is fixed in the region of its lower end 62 between the two opposite side plates 65, 66, namely by means of two further bolts 69, which can also be screw bolts. As can be seen, the opposing side plates 65, 66 of the mast shoe 64 form tie rods 67 from which connect the mast 60 on the opposite side of the boom 80 with the longitudinal beam 14 of the chassis 10.

The boom 80 sits at the upper end 61 of the mast 60 . In particular, it extends over the upper end 61 of the mast 60 . Here, the boom 80 is connected to the mast 60 via an articulated connector 70 . This articulated connector 70 has two T-shaped side plates 71, 72 which are vertically aligned and face each other. The mast 60 is fixed in the region of its upper end 61 by means of bolts 73 between the two opposite side plates 71, 72 of the articulated connector 70. The cantilever 80 is also fixed by means of bolts 74 between the two opposite side plates 71, 72 of the articulated connector 70.

When the workshop crane 1 is set up on a horizontal base, the jib 80 is also aligned geodetically horizontally. No adjustment device or adjustment device for changing the orientation is provided here. The load holder 81 or the load hook hangs on a trolley 82, which is mounted to be displaceable along the boom 80 between two positions L1, L2. For this purpose, two runner stops 85, 86 are fixed on the boom 80, against which the trolley 82 strikes in the positions L1, L2. In addition, the trolley 82 has a parking brake 84 with which it can be secured against displacement on the boom 80 . The trolley 82 has a hoist 83, here a chain hoist, to which the load receptacle 81 or the load hook is fixed. Instead of a chain hoist, however, a winch can also be provided, and electrical variants are also conceivable.

the 2 and 3 show a perspective view and a side view of a workshop crane 1, which, with the exception of a few rubber pads and two bolts above the rollers 15, 16 on the crossbeam 13, is shown in FIG 1 is equivalent to. The workshop crane 1 is folded up here, however. For this purpose, after releasing a safety device, namely one of the bolts 73 on the mast 60 , the boom 80 can be folded down so that it rests on the mast 60 . In addition, the mast 60 is pivotally mounted in the mast shoe 64 about one of the bolts 69 when the other of the bolts 69 is loosened. As shown, the mast 60 is folded so that it faces toward the rear end 12 of the chassis 10 and rests on top of the weights 41 .

How to get into the 2 and 3 can see, 14 more holes 19 are introduced in the longitudinal beam. These serve to convert the into the 1 , 2 and 3 workshop crane 1 designed as a counterweight crane to a workshop crane driving under the load 4 .

Compared to the structure after 1 is the workshop crane 1 according to 4 converted in such a way that the mast shoe 64 is arranged in the region of the rear end 12 of the chassis 100. For this purpose, the longitudinal beam 14 has fixing holes 19 for the bolts 68 at two different positions along its length, and the mast shoe 64 can be optionally formed in the area of the front end 11 on the longitudinal beam 14, as shown in FIG 1 shown, or at a position in the area of the rear end 12 as in FIG 4 shown. It can be seen that the weights 41, 42, 43 and the square tube of the weight holder 40 have been removed for assembly at the rear end 12. This enables the formation of the mast foot 63 in the area of the weight receiver 40 . The orientation of the side plates 65, 66 is unchanged, however, so that the tie rods 67 are still loaded with tension when lifting a load.

Theoretically, reverse mounting of the side plates 65, 66 would also be conceivable, so that the mast 60 is positioned even further in the direction of the rear end 12. Then, however, side plates 65, 66 are necessary, in which the tension struts 67 do not buckle even under pressure. This can be achieved, for example, by edging along the tension struts 67 .

With the flat chassis 10, the workshop crane 1 can now be driven under a load, for example under an installed car engine. After lifting, the load then essentially hovers over the chassis 10, or the weight of the chassis 10 and the mast 60 is sufficient to counteract a tilting moment of a load receptacle 81 lying slightly in front of the crossbeam 13. Optionally, the second runner stop 86 can also be arranged displaceably on the arm 80, so that the travel of the trolley 82 to the front can be variably limited.

The invention is not limited to one of the embodiments described above, but can be modified in many ways.

For example, a structure is also possible in which the boom 80 is mounted on the mast 60 such that it can be pivoted up and down, and an actuator is provided for carrying out the pivoting up and down. The actuator can in particular be a lifting cylinder, for example a hydraulic cylinder. Such a trolley will then tend not to be equipped with a trolley, because it would then have to be equipped with a drive so that it can move from the horizontal when the boom is pivoted does not start moving and can be moved further against or with a slope. Instead, with such a swivel variant, a rope pulley at a position that can be fixed along the boom is recommended. A winch thereof can be fixed either at the position of the pulley or on the mast or chassis.

Reference List

1

workshop crane

10

chassis

11

front end (of chassis)

12

rear end (of chassis)

13

crossbeam

14

longitudinal beam

15

wheel (on crossbeam)

16

wheel (on crossbeam)

17

Wheel (on longitudinal beam)

18

Parking brake (wheel (17))

19

Fixing holes (longitudinal beam)

30

hand drawbar

31

handle bar (of the hand drawbar)

32

handle

40

weight intake

41

weight

42

weight

43

weight

44

handle (weight)

50

crane construction

60

mast

61

top end (of the mast)

62

lower end (of the mast)

63

mast foot

64

mast shoe

65

side plate (mast shoe)

66

side plate (mast shoe)

67

Tension struts (mast shoe)

68

Bolts (mast shoe chassis)

69

bolt (mast shoe mast)

70

articulated connector

71

first side plate (articulated connector)

72

second side plate (articulated connector)

73

Bolt (joint connector mast)

74

Bolts (jointed connector cantilever)

80

boom

81

Load attachment (e.g. load hook)

82

trolley

83

hoist

84

Parking brake (trolley)

85

first runner stop

86

second runner stop

L1

first position (trolley)

L2

second position (trolley)

P1

first position (mast shoe)

p2

second position (mast shoe)

Claims (12)

Workshop crane (1) with a chassis (10) and a crane superstructure (50), - the chassis (10) having at least one wheel (15, 16, 17) in the region of a front end (11) and a rear end (12) and - the crane structure (50) having a mast (60) which is connected to the chassis (10) in the region of its lower end (62) via a mast base (63), and - the crane structure (50) having a Cantilever (80), - wherein in the region of the rear end (12) a hand drawbar (30) is fixed to the chassis (10), - wherein the chassis (10) has a longitudinal crossbar (14) which extends between the front end ( 11) and the rear end (12), characterized in that - the jib (80) is connected to the mast (60) in the region of an upper end (61) of the mast (60), and on the jib (80) a load pick-up (81) is arranged, - the mast foot (63) has a mast shoe (64) which is connected to the chassis (10) or which is integrated of a region of the chassis (10), - the mast shoe (64) or parts thereof are detachably connected to the longitudinal crossbar (14) of the chassis (10) via bolts (68), and - the longitudinal crossbar (14) along its length at least has fixing holes (19) for the bolts (68) in two different positions, and the mast shoe (64) can be fixed in one of the at least two positions on the longitudinal crossbar (14) or can be formed with the integration of the longitudinal crossbar (14). Workshop crane (1) according to claim 1 , characterized in that the mast (60) in the region of its lower end (62) on the mast foot (63) is detachably connected to the chassis (10). Workshop crane (1) according to claim 1 or 2 , characterized in that in the region of the rear end (12) of the chassis (10) there is a weight holder (40) via which one or more weights (41, 42, 43) can be detachably connected to the chassis (10). Workshop crane (1) according to one of the preceding claims, characterized in that it can be converted from a counterweight crane to a workshop crane driving underneath. Workshop crane (1) according to claim 4 , characterized in that the mast foot (63) can be fixed to the chassis (10) in the region of the front end (11) in order to form a counterweight crane. Workshop crane (1) according to one of Claims 4 or 5 , characterized in that the mast base (63) can be fixed to the chassis (10) in the area of the rear end (12) in order to form a workshop crane driving underneath. Workshop crane (1) according to one of the preceding claims, characterized in that the chassis has a crossbeam at the front end, which is aligned transversely to the extension between the front end (11) and the rear end (12). Workshop crane (1) according to one of the preceding claims, characterized in that the mast (60) is foldably mounted on the chassis (10) after releasing a safety device in the area of the mast foot (63), preferably in such a way that it can be moved in the direction of the rear end (12) of the chassis (10) can be folded over. Workshop crane (1) according to one of the preceding claims, characterized in that the jib (80) is aligned horizontally and the load receiver (81) is fixed to a trolley (82) which moves between two positions (L1, L2) along the jib ( 80) is slidably mounted. Workshop crane (1) according to one of the preceding claims, characterized in that the jib (80) is mounted on the mast (60) so that it can be folded down after a safety catch has been released. Workshop crane (1) according to one of the preceding claims, characterized in that the jib (80) is connected to the mast (60) via an articulated connector (70). Workshop crane (1) according to one of Claims 1 until 8th , characterized in that the boom (80) is mounted on the mast (60) so that it can be pivoted up and down, and an adjusting drive is provided for carrying out the pivoting up and down.

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