EP3168185A1 - Lifting mast of lifting frame of inductrial truck - Google Patents

Abstract

The invention relates to a mast (1) of a mast of an industrial truck, wherein the mast is provided with a liftable and lowerable load-receiving means and the mast (1) has two laterally spaced rails (2a, 2b) by means of at least one cross member (3) with each other are connected. The cross member (3) is X-shaped and consists of a between the profile rails (2a, 2b) arranged central region (40) and of the central region (40) to the profile rails (2a, 2b) extending X-shaped and on the rails (2a, 2b) attached struts (41-44). Between the central region (40) and two struts (41, 42, 43, 44), which extend to one of the two profiled rails (2a, 2b), a see-through opening (45a, 45b) is formed which extends up to one of the extends two profiled rails (2a, 2b).

Description

The invention relates to a mast of a mast of an industrial truck, wherein the mast is provided with a liftable and lowerable load-receiving means and the mast has two laterally spaced rails, which are interconnected by means of at least one cross member.

Such masts are used in masts of forklifts, such as counterbalance forklifts. Known masts can as a mast of einschüssigen mast (so-called simplex mast) or as an extension mast of mehrschüssigen mast, for example a duplex mast, which consists of a stationary mast and an extension mast, or a triplex mast, which consists of a stationary mast and two extension masts be trained.

The two laterally spaced rails of such lifting masts are usually connected to each other by means of at least two cross members. The area between the two profiled rails then forms a viewing area through the lifting mast, through which an operator located on a driver's workplace of the industrial truck can look at a load receiving means which can be raised and lowered on the profiled rails of the lifting mast.

Here, designs of masts are known in which the two laterally spaced rails of the mast are interconnected by means of at least three cross members. A first cross member is designed as a foot cross member, which is arranged in the foot region of the profile rails. Another cross member is designed as a head cross member, which is arranged in the head region of the profile rails. At least one further cross member is formed as a central cross member, which is arranged in the vertical direction of the mast between the Fußquerträger and the head cross member. In the execution of the mast as a liftable and lowerable extension mast of a multi-arm mast which also mitangehobene or lowered middle cross member leads depending on the stroke position of the extension mast and thus at different lifting heights of a lifting device of the lifting mast to a visual obstruction of an operator located on a driver's workplace of the truck on the load-carrying means.

In known masts the cross member is designed as a solid component, for example as a steel plate. However, such a solid component as a cross member leads to a large visual obstruction of the operator of the truck on the load-carrying means.

In order to reduce the visual impairment of the operator of the truck on the load-carrying means, it is already known to produce at the cross member, which is formed by a solid component, for example, a substantially rectangular steel plate, at low-load points through holes. A mast with a massive cross member, which is provided with such openings, for example, from WO 2014/124932 A1 known. Even with a cross member, which is provided with such openings, however, still results in different lifting heights of a lifting device of the mast still a visual obstruction of the operator of the truck on the load-carrying means, since the load-carrying means is covered by the cross member. The operator must therefore move the head and / or the upper body accordingly strong to get across the cross member or under the cross member through a view of the load receiving means.

The present invention has for its object to provide a mast of the type mentioned available that allows its shape improved visibility of an operator of the truck on the load-carrying means.

This object is achieved in that the cross member is X-shaped, consisting of an arranged between the rails central area and from the central area to the rails X-shaped extending and attached to the rails struts, wherein between the central area and two struts , Which extend to one of the two profile rails, in each case a see-through opening is formed which extends to one of the two profile rails. Such an X-shaped cross member leads to an improved view of a Operator by the mast, since an X-shaped cross member laterally at the central region each forms a see-through opening, which increases in the transverse direction of the mast from the central region to the corresponding rail in the vertical direction in height and extends in the transverse direction of the mast to the rail , Such openings on the X-shaped cross member, which extend up to the rails and increase in the transverse direction of the mast to the rails each in height, lead to improved review by the cross member and allow the located on the driver's workplace and look at the load-carrying means Operator a maximum field of view of the load-carrying means, in which the view of the load-carrying means is minimally affected by the cross member. The mast according to the invention thus enables the operator of the truck an improved view of the load-carrying means. The mast according to the invention further leads to improved ergonomics for the operator of the truck, since the operator must move the head and / or the upper body only minimally by the improved review by the X-shaped cross member to through the cross member through a view of the To receive load-carrying means.

According to a preferred embodiment of the invention, the cross member has a first strut, which extends from the central region in the vertical direction rising to the first rail and is secured to the first rail, a second strut, which sloping from the central region in the vertical direction to the extends first rail and is attached to the first rail, a third strut, which extends from the central region in the vertical direction rising to the second rail and attached to the second rail, and a fourth strut, which from the central region in the vertical direction sloping to the second rail and is attached to the second rail. With four such struts, which extend from the central region to the two profile rails, an X-shaped cross member can be formed with two large viewing ports, each of which is arranged laterally of the central region with little construction. By the upwardly or downwardly extending struts of the X-shaped cross member also an increased height of the cross member is achieved at the outer ends of the transverse struts and thus in the region of the rails. The increased height of the cross member at the outer ends of the crossbars leads to lower component stresses at bending loads, so that the struts in the Mass and thus can be reduced in cross-section, which further has a favorable effect on improved visibility through the mast on the load-carrying means.

Advantageously, the struts are each separately attached to the rails by means of their own attachment interfaces. By a separate and thus each own attachment of the four X-shaped struts arranged can be attached to the two rails with little construction of the cross member. The cross member according to the invention is thus designed to be open at the outer ends of the struts, wherein in each case the two struts, which limit a see-through opening, have no connection to one another at the outer ends.

With regard to an improved view of the lifting mast on the load receiving means, there are further advantages if, according to a development of the invention, an upper side of the struts rises at least partially from the load-remote side of the mast to the load-facing side of the mast and an underside of the struts at least partially away from the load Side of the mast to the load-facing side of the mast runs sloping. As a result, a cross-sectional shape of the struts is achieved in which the load-facing front of the struts in the vertical direction has a lower height than the load-facing rear side of the struts. The cross-sectional shape of the struts is thus also designed to optimize vision, since the underside of the struts is in a line of sight operator located in the line of sight of the operator located on the driver's workstation and the top of the struts in an upwardly facing operator in the line of sight of the driver's workstation Operator lies.

According to an advantageous embodiment of the invention, a lifting carriage provided with the load receiving means is longitudinally displaceably arranged in the rails and the lifting mast for raising and lowering of the lifting carriage is provided in the rails with a Hubzylindereinrichtung, the Hubzylindereinrichtung is in operative connection with a lifting means, with a first End is attached to the lifting and is attached with a second end to the other mast and is deflected at the Hubzylindereinrichtung, wherein the Hubzylindereinrichtung is supported on the cross member and / or the lifting means is attached to the cross member. The X-shaped cross member according to the invention thus also forms the function of an attachment point of Hubzylindereinrichtung and optionally continue to function as a Ausknicksicherung the Hubzylindereinrichtung. In addition, the cross member forms the function of a holder for the lifting means.

The lifting cylinder device is expediently arranged between the profiled rails, in particular substantially centrally between the profiled rails. The lifting cylinder device is advantageously supported on the central region of the cross member and / or the lifting means attached to the central region of the cross member.

The X-shaped cross member according to the invention may be formed in one piece and thus consist of a component.

Advantageously, such a one-piece cross member is designed as a forging component or as a cast steel component.

Alternatively, such a one-piece cross member may be formed as a sheet metal part. Such a cross member can be made of a steel plate by bending forming, for example, pressing, or cutting, for example, laser cutting or flame cutting.

The X-shaped cross member according to the invention may alternatively be formed in several pieces and thus be composed of several components.

Conveniently, for this purpose, the cross member is composed of the central region and the struts, wherein the struts are attached to the central region by welded joints or screw connections.

In the case of a multi-part cross member, the central region can be designed as a forged component or as a cast steel component.

Each of the four struts may be formed by a single component that is attached to the central area. Advantages in terms of a cheap production arise when the first strut and the second strut of a first sheet metal part and the third strut and the fourth strut are formed by a second sheet metal part, wherein the two sheet metal parts are fastened to the central region by welded joints or screw connections. The sheet metal parts can be made of a steel plate by cutting, for example, laser cutting or flame cutting.

According to an advantageous embodiment of the invention, the load-carrying means is designed as a fork with two forks, wherein the see-through openings on the cross member allow a view of an operator located on a driver's workplace of the truck on the fork tine tips of the forks in the fully lowered position of the lifting device.

The mast according to the invention can be designed as a stationary mast of einschüssigen mast.

Alternatively, the mast according to the invention may be designed as an extension mast of a multi-branch mast. The X-shaped cross member on a lift mast designed as an extension mast allows improved review of an operator of the truck on the load-carrying means at different lifting heights of the extension mast and thus of the load receiving means.

Figur 1

einen Ausschnitt eines Hubmastes des Standes der Technik,

Figur 2

einen Ausschnitt eines Hubmastes des Standes der Technik, bei dem der Querträger mit Durchsichtöffnungen versehen ist,

Figur 3

den Hubmast der Figur 1 mit einem Blick einer Bedienperson des Flurförderzeugs auf das vollständig abgesenkte Lastaufnahmemittel,

Figur 4

einen Ausschnitt eines erfindungsgemäßen Hubmastes,

Figur 5

den Hubmast der Figur 4 mit einem Blick einer Bedienperson des Flurförderzeugs auf das vollständig abgesenkte Lastaufnahmemittel und

Figur 6

eine perspektivische Darstellung einer alternativen Ausführungsform eines erfindungsgemäßen Hubmastes.

Further advantages and details of the invention will be explained in more detail with reference to the embodiments illustrated in the schematic figures. This shows

FIG. 1

a detail of a lifting mast of the prior art,

FIG. 2

a detail of a lifting mast of the prior art, in which the cross member is provided with openings,

FIG. 3

the mast of the FIG. 1 with a view of an operator of the truck on the fully lowered load-carrying means,

FIG. 4

a detail of a lifting mast according to the invention,

FIG. 5

the mast of the FIG. 4 with a view of an operator of the truck on the fully lowered load-carrying means and

FIG. 6

a perspective view of an alternative embodiment of a lifting mast according to the invention.

In the FIGS. 1 to 3 in each case a mast 1 of a mast of a truck of the prior art is shown. In the FIGS. 1 to 3 is the mast 1 as Ausfahrmast, for example, inner mast, a mehrschüssigen mast, for example, a duplex mast or a triplex mast formed.

The mast 1 of the FIGS. 1 to 3 has two laterally spaced in the transverse direction QR of the mast 1 profiled rails 2a, 2b. The two profiled rails 2a, 2b are interconnected by means of a plurality of cross members 3. In the FIGS. 1 to 3 in each case a vertically central region of the mast 1 is shown. A non-illustrated lower cross member is arranged in the vertically lower foot region of the two rails 2a, 2b and formed as a foot cross member. The illustrated cross member 3 is spaced in the vertical direction VR of the mast 1 of the Fußquerträger and formed as a central cross member 3a. Not shown in detail is an upper cross member which is arranged in the vertically upper head region of the two profile rails 2a, 2b and formed as a head cross member. The cross member 3 is preferably connected to the profile rails 2a, 2b by welded joints.

In the two profile rails 2a, 2b, a not shown lifting carriage is longitudinally displaceable, i. liftable and lowerable, arranged. The lifting carriage is provided with a load-receiving means, which is formed for example by a fork with two forks.

The mast 1 is provided for raising and lowering the lifting carriage with a lifting cylinder 5. In the illustrated embodiment, the Hubzylindereinrichtung 5 is formed by a single lifting cylinder 5a, which has a cylinder housing 6 which is attached to the mast 1, and a retractable and retractable Piston rod 7 has. The lifting cylinder 5a is arranged vertically standing and arranged in the illustrated embodiment in the transverse direction of the lifting mast 1 between the two rails 2a, 2b, preferably substantially centrally between the two rails 2a, 2b. The lifting cylinder 5a is supported with the cylinder housing 6 on the Fußquerträger in a manner not shown in the vertical direction.

The lifting cylinder device 5 is in operative connection with a lifting means 10. The lifting means 10 is formed in the illustrated embodiment as a lifting chain 11. The lifting means 10 is attached to a first end in a manner not shown on the lifting. With a second end 10 b, the lifting means 10 is attached to the middle cross member 3 a of the mast 1. In the FIGS. 1 to 3 is designed as lifting chain 11 lifting means 10 is provided at the second end 10b with a chain anchor 12 which is guided through a receiving bore of the middle cross member 3a and a fastening means 13, in the illustrated embodiment, a screw, is attached to the center cross member 3a.

The lifting means 10 is deflected between the two ends 10 a, 10 b on the lifting cylinder device 5. The extending or retracting piston rod 7 of the lifting cylinder 5a is provided for this purpose with a deflection roller 15 which is rotatably mounted about a transverse axis QR of the mast 1 extending axis of rotation 16. The lifting means 10 is guided for deflection via the deflection roller 15.

The center crossmember 3a further forms an upper support of the lifting cylinder device 5. The lifting cylinder device 5 is for this purpose attached to the central cross member 3a, for example with a cylinder housing 6 or a cylinder head of the cylinder housing encompassing clamp 20, as in the FIG. 3 is shown in more detail. The center cross member 3a thus further has the function of a further attachment point of the lifting cylinder 5 and the function of a Ausknicksicherung the lifting cylinder 5 on.

In the mast 1 of FIGS. 1 to 3 Thus, the cross member 3 designed as the center cross member 3a assumes the function of an abutment for the chain anchor 12 for fastening the lifting means 10 and as a buckling protection of the lifting cylinder device 5.

The lifting cylinder device 5 is in the FIGS. 1 to 3 Thus formed as a free-lift, with which the load-carrying means can be fully raised in the mast formed as an extension mast 1, before being raised by a mast lift designed as Ausfahrmast mast in a stationary mast of a duplex mast or another extension mast of a triplex mast.

The area between the profiled rails 2a, 3b forms a see-through area 25 of the lifting mast, through which an operator located on a driver's workplace of the industrial truck, for example a counterbalance forklift, can look at the load receiving means.

In the FIGS. 1 to 3 the cross member is formed as a solid, plate-shaped component, which is fastened at the two outer end to the profile rails 2a, 2b of the mast 1 each by a welded connection. The forces exerted by the lifting means 10 on the cross member 3 forces are introduced via the cross member 3 and the welds of the welded joints in the rails 2a, 2b. The shape of the cross member 3 depends on the component stresses and the stresses in the welds, with which the cross member 3 is welded to the rails 2a, 2b, in order to achieve a ordered fatigue strength.

In the FIG. 2 is shown as a center cross member 3a formed cross member 3 of a mast 1 of the prior art, which is also formed as a solid, plate-shaped component and little, by the power flow in the cross member 3 loaded points with small see-through windows 26a, 26b is provided. The see-through windows 26a, 26b are formed by recesses in the solid and plate-like cross member 3, which in the FIG. 2 are illustrated by a hatching. With the see-through windows 26a, 26b in the solid and plate-like cross member 3, the view through the cross member 3 can be improved.

In a mast 1 of the prior art with cross members 3 of FIGS. 1 and 2 However, it is disadvantageous that an operator located on the driver's workplace of the truck at different lifting heights of the mast 1 and thus of the load receiving means, the fork tines of the forks of a load lifting device designed as a fork in normal posture and normal Viewing direction can not see because the fork tine tips of the forks are covered by the solid and plate-shaped cross member 3.

In the FIG. 3 This is on the mast 1 of FIG. 1 clarified. In the FIG. 3 the mast 1 is shown at fully lowered load-carrying means. The load handling device is designed as a fork with two forks, of which in the FIG. 3 a right fork 30 is shown. In the FIG. 3 Here is the field of view of an operator located on the driver's workplace of the truck at normal posture and normal direction of view of the fork 30 shown. In this lifting position of the lifting device, the fork tip of the fork 30 is covered by the cross member 3, so that the operator can not see the fork tip in normal posture and normal viewing direction. Even with an embodiment of the cross member 3 of FIG. 2 With see-through windows 26a, 26b also results in no significant improvement in the visibility of the operator of the truck on the forks and fork tines. In a mast 1 of the prior art, the operator must move the head and / or the upper body accordingly strong to get over the cross member 3 away or below the cross member 3 through a view of the fork tip of the fork prong 30. However, this leads to poor ergonomics for the operator of the truck.

However, for the orientation of the operator of the truck, the fork tine tips of the forks 30 are an essential factor.

In the FIGS. 4 to 6 in each case an inventive mast 1 of a mast of an industrial truck is shown. With the FIGS. 1 to 3 the same components are provided with the same reference numerals. The FIG. 4 branches a first embodiment and the FIG. 6 A second embodiment of a lifting mast 1 according to the invention.

In the FIGS. 4 to 6 is the mast 1 as Ausfahrmast, for example, inner mast, a mehrschüssigen mast, for example, a duplex mast or a triplex mast formed.

The mast 1 of the invention FIGS. 4 to 6 has two laterally spaced in the transverse direction QR of the mast 1 profiled rails 2a, 2b. The two Profile rails 2a, 2b are interconnected by means of a plurality of cross members 3. In the FIGS. 4 and 5 in each case a vertically central region of a lifting mast 1 according to the invention is shown. The FIG. 6 shows the lower and middle region of a lifting mast according to the invention 1. A in the FIG. 6 illustrated lower cross member 4 is disposed in the lower vertical foot region of the two rails 2a, 2b and formed as a foot cross member 4a. The in the FIGS. 4 to 6 illustrated cross member 3 is spaced in the vertical direction VR of the mast 1 of the Fußquerträger 4a and formed as a central cross member 3a. Not shown in detail is an upper cross member which is arranged in the vertically upper head region of the two profile rails 2a, 2b and formed as a head cross member. The cross member 3 and the cross member 4 is preferably connected to the rails 2a, 2b by welded joints.

In the two profile rails 2a, 2b, a not shown lifting carriage is longitudinally displaceable, i. liftable and lowerable, arranged. The lifting carriage is provided with a load-receiving means, which is formed for example by a fork with two forks.

The mast 1 is provided for raising and lowering the lifting carriage with a lifting cylinder 5. In the illustrated embodiment, the lifting cylinder 5 is formed by a single lifting cylinder 5a, which has a cylinder housing 6, which is attached to the mast 1, and a retractable and retractable piston rod 7. The lifting cylinder 5a is arranged vertically standing and arranged in the illustrated embodiment in the transverse direction of the lifting mast 1 between the two rails 2a, 2b, preferably substantially centrally between the two rails 2a, 2b. The lifting cylinder 5a is - as in the FIG. 6 is shown in more detail - supported with the cylinder housing 6 on the Fußquerträger 4 in the vertical direction.

The lifting cylinder device 5 is in operative connection with a lifting means 10. The lifting means 10 is formed in the illustrated embodiment as a lifting chain 11. The lifting means 10 is attached to a first end 10a in a manner not shown on the lifting. With a second end 10 b, the lifting means 10 is attached to the middle cross member 3 a of the mast 1. In the FIGS. 4 to 6 is designed as a lifting chain 11 lifting means 10 at the second end 10b with a Chain anchor 12 provided, which is guided through a receiving bore of the middle cross member 3a and a fastening means 13, in the illustrated embodiment, a screw, is attached to the center cross member 3a.

The lifting means 10 is deflected between the two ends 10 a, 10 b on the lifting cylinder device 5. The extending or retracting piston rod 7 of the lifting cylinder 5a is provided for this purpose with a deflection roller 15 which is rotatably mounted about a transverse axis QR of the mast 1 extending axis of rotation 16. The lifting means 10 is guided for deflection via the deflection roller 15.

The center crossmember 3a further forms an upper support of the lifting cylinder device 5. The lifting cylinder device 5 is for this purpose attached to the central cross member 3a, for example with a cylinder housing 6 or a cylinder head of the cylinder housing encompassing clamp 20, as in the FIG. 5 is shown in more detail. The center cross member 3a thus further has the function of a further attachment point of the lifting cylinder 5 and the function of a Ausknicksicherung the lifting cylinder 5 on.

In the mast 1 of FIGS. 4 to 6 Thus, the cross member 3 designed as the center cross member 3a assumes the function of an abutment for the chain anchor 12 for fastening the lifting means 10 and as a buckling protection of the lifting cylinder device 5.

The lifting cylinder device 5 is in the FIGS. 4 to 6 designed as Freihubzylinder with which the load-carrying means can be fully raised in the mast formed as an extension mast 1, before being raised by a mast lift designed as Ausfahrmast mast in a stationary mast of a duplex mast or another extension mast of a triplex mast.

The area between the profiled rails 2a, 3b forms a see-through area 25 of the lifting mast 1, through which an operator located on a driver's workplace of the industrial truck, for example a counterbalance forklift, can look at the load receiving means.

In the mast 1 of the invention FIGS. 4 to 6 is formed as a central cross member 3a cross member 3 X-shaped. The cross-member 3 having the shape of an X consists of a central region 40 arranged between the profiled rails 2a, 2b and struts 41-44 extending from the central region 40 to the profiled rails 2a, 2b and attached to the profiled rails 2a, 2b. Between the central region 40 and two struts 41, 42 and 43, 44, which extend to one of the two profiled rails 2a and 2b, respectively, a see-through opening 45a, 45b is formed which extends in the transverse direction QR of the mast 1 from the central region 40th extends up to the corresponding profile rail 2a, 2b.

The cross member 3 according to the invention comprises a first strut 41, which extends from the central region 40 in the vertical direction rising to the first rail 2a and attached to the first rail 2a, and a second strut 42, from the central region 40 in the vertical direction sloping to the first rail 2a and is attached to the first rail 2a. Between the central region 40, the two struts 41, 42 and the rail 2a, the see-through opening 45a is formed. The cross member 3 according to the invention further comprises a third strut 43 which extends from the central region 40 in a vertical direction to the second profile rail 2b and is attached to the second rail 2b, and a fourth strut 44, from the central region 40 in the vertical Direction sloping to the second rail 2b and is attached to the second rail 2b. Between the central region 40, the two struts 43, 44 and the rail 2b, the see-through opening 45b is formed.

The struts 41-44 extend in such a way from the central area 40 outwards in the direction of the profiled rails 2a, 2b, that the see-through openings 45a, 45b at the central area 40 form a rounded, in particular circular, transition 46a, 46b. Such a transition 46a, 46b has a favorable effect on the component stresses caused by the force flow in the cross member 3.

In the laterally outer region on the profile rails 2a, 2b, the viewing apertures 45a, 45b in the vertical direction VR have a height extent which is greater than the maximum height extent of the central region 40 in the vertical direction VR.

The struts 41-44 are each at the outer ends separated from each other on the rails 2a, 2b of the mast 1 each secured by means of its own attachment interface BF1-BF4. The struts 41-44 are thus each independently attached to the rails 2a, 2b. Preferably, the struts 41-44 are secured at the outer ends respectively to the corresponding rail 2a and 2b, respectively, by a welded joint having corresponding welds. The cross member 3 according to the invention is thus made open at the outer ends of the struts 41-44. The struts 41 and 42 have no connection to each other at the outer ends. Accordingly, the struts 43 and 44 have no connection to each other at the outer ends.

The struts 41-44 are inclined upward or inclined downward such that the cross member 3 according to the invention with respect to a cross member 3 of the prior art at the outer regions where the cross member 3 is connected to the rails 2a, 2b, a having increased height H in the vertical direction. Preferably, the cross member 3 according to the invention a ratio H / B of the height H to the lateral distance B of the two rails of greater than or equal to 0.65. By increasing the height H at the outer ends of the cross member 3, two narrow struts 41, 42 and 42, 43 instead of a solid web of the cross member 3 of the prior art (3) can be formed on each side of the cross member 3 according to the invention. FIGS. 1 to 3 ) are used, so that two correspondingly large see-through opening 45a, 45b arise, resulting in an improved view through the cross member 3 according to the invention.

In the embodiment of FIGS. 4 and 5 is an upper side 50 of the struts 41-44 at least partially rising from the load side facing away from the mast 1 to the load-facing side of the mast 1 and a bottom 51 of the struts 41-44 at least partially from the load side facing away from the mast 1 to the load-facing side of the mast. 1 arranged sloping. The struts 41-44 thus have at least partially at the load facing away from the front side 52 of the struts 41-44 in the vertical direction VR a lower height HV (thickness of the struts 41-44) than the height HH (thickness of the struts 41-44) on the load-facing rear side 53 of the struts 41-44.

In the lifting mast 1 according to the invention, the lifting cylinder device 5 is supported on the central region 40 of the cross member 3 and the lifting means 10 is secured to the central region 40 of the cross member 3. For this purpose, the lifting cylinder device 5 is fastened to the central region 40, for example with the clamp 20 embracing the cylinder housing 6 or a cylinder head of the cylinder housing 6, as in FIG FIG. 5 is shown in more detail. For this purpose, the lifting means 10 designed as lifting chain 11 is provided at the second end 10b with a chain anchor 12, which is guided through a receiving bore of the central region 40 and is fastened to the central region 40 via a fastening means 13, in the exemplary embodiment shown.

In the embodiment of the FIGS. 4 and 5 the cross member 4 according to the invention is integrally formed. The cross member 3 consisting of the central region 40 and the four struts 41-44 is preferably designed as a forging component or as a cast steel component. The struts 41-44 are preferably attached to the profile rails 2a, 2b of the mast 1 by a welded connection.

In the embodiment of FIG. 6 , In which a further embodiment of the invention is shown, cross member 3 is formed in several pieces. The cross member 3 of FIG. 6 is composed of a component forming the central portion 40 and other components constituting the struts 41-44. The components forming the struts 41-44 can in this case be fastened to the component forming the central region 40 by welded connections or screw connections.

The component forming the central region 40 is preferably designed as a forging component or as a cast steel component.

In the FIG. 6 the first strut 41 and the second strut 42 is formed by a first sheet-metal shaped part 60. The third strut 43 and the fourth strut 44 are formed by a second sheet metal shaped part 61. The two sheet-metal shaped parts 60, 61 are fastened to the component which forms the central region 40 by welded connections or screw connections. The sheet metal parts 60, 61 are preferably formed as sheet metal parts, which are made of a steel plate by cutting, for example, laser cutting or flame cutting.

In a mast 1 according to the invention with the X-shaped cross member 3 of FIGS. 4 to 6 results through the see-through openings 45a, 45b an improved view through the mast 1 for an operator located on the driver's workplace of the truck at different lifting heights of the mast 1 and thus the load receiving means, since the see-through openings 45a, 45b, the fork tines of the forks of a load forklift designed as a load receiving means can see in normal posture and normal direction of view, since the fork tips of the forks over the see-through openings 45a, 45b of the cross member 3 according to the invention are visible.

In the FIG. 5 This is on the mast 1 of FIG. 4 clarified. In the FIG. 5 the mast 1 is shown at fully lowered load-carrying means. The load handling device is designed as a fork with two forks, of which in the FIG. 5 a right fork 30 is shown. In the FIG. 5 Here is the field of view of an operator located on the driver's workplace of the truck at normal posture and normal direction of view of the fork 30 shown. In this lifting position of the lifting device, the fork tip 30a of the fork 30 is not covered by the cross member 3, but can be viewed through the see-through opening 45b of the cross member 3, so that the operator can see the fork tip 30a in normal posture and normal viewing direction.

In the cross member 3 according to the invention can by the optimized height H at the outer ends of the cross member 3, wherein the optimized height H leads to lower bending stresses in the cross member 3, resulting from the forces from the attachment of the lifting means 10, the mass of the four Webs 41-44 and reduced their cross-section, so that large inspection openings 45a, 45b are achieved in the cross member 3. The cross member 3 according to the invention has by the shape and X-shaped form a maximum field of view and an improved view of the operator located on the driver's workplace of the truck on the fork tine tips 30 a of the forks 30. Due to the large see-through openings 45a, 45b of the cross member 3 according to the invention results in respect to the prior art, a significantly improved view of the operator located on the driver workplace of the truck through the mast 3 on the fork tine tips 30a of the forks 30 as a forks with two Forks trained lifting device. The improved and optimized view of the fork tine tips 30a of the forks 30 leads to an improved orientation of the forklift operator located on the driver's workplace of the industrial truck. In addition, the cross member 3 according to the invention leads to improved ergonomics for the operator located on the driver's workplace of the truck, since the operator with normal posture and normal viewing direction has a view of the fork tine tips 30a, so that no change in posture and / or gaze is required to get a view of the fork tine tips 30a.

In the cross member 3 according to the invention also occur due to the enlarged and optimized height H at the outer ends of the cross member 3 reduced bending stresses and torsional stresses in the cross member 3 due to the forces introduced from the attachment of the lifting means 10 and the Hubzylindereinrichtung 5. In a compound of the cross member 3 with the rails 3a, 3b by welded joints are also achieved by the increased and optimized height H at the outer ends of the cross member 3 lower stresses in the welds of the welded joints. This has a favorable effect on the fatigue strength of the cross member 3 according to the invention.

The invention is not on the in the FIGS. 4 and 5 illustrated embodiment with an embodiment of the one-piece cross member 3 as a forging component or as a cast steel component limited. Alternatively, the one-piece cross member 3 of the FIGS. 4 and 5 be formed as a sheet metal part and from a steel plate by bending forming, for example, pressing, or cutting, for example, laser cutting or flame cutting, are produced.

The invention is also not on in the FIG. 6 illustrated embodiment with a multi-part cross member 3 limited. A multi-part cross member 3 may alternatively be formed as a welded assembly, one of the FIG. 4 or the FIG. 6 has comparable shape.

Instead of the embodiment of the lifting cylinder device 5 with a single lifting cylinder 5 a and a single lifting means 10, the lifting cylinder device 5 can be formed by a plurality of lifting cylinders and a plurality of lifting means 10.

The lifting means 10 may alternatively be designed as a lifting chain as a lifting belt or as a hoisting rope.

The mast 1 according to the invention can be designed as a stand mast of a one-armed mast (simplex mast) or as an extension mast of a multi-arm mast, for example a duplex mast or a triplex mast.

Claims (16)

Lifting mast (1) of a mast of an industrial truck, wherein the lifting frame is provided with a raisable and lowerable load carrying means and the mast (1) (2a, 2b) comprises two laterally spaced rails which are interconnected by means of at least one cross-member (3), characterized characterized in that the cross member (3) is X-shaped, consisting of a between the profile rails (2a, 2b) arranged central region (40) and of the central region (40) to the profile rails (2a, 2b) extending X-shaped and struts (41-44) fixed to the profiled rails (2a, 2b), between the central region (40) and two struts (41, 42; 43, 44) extending to one of the two profiled rails (2a; 2b) , in each case a see-through opening (45a, 45b) is formed, which extends to one of the two profile rails (2a, 2b). Lift mast according to claim 1, characterized in that the cross member (3) has a first strut (41) extending from the central region (40) in the vertical direction rising to the first rail (2a) and attached to the first rail (2a) is a second strut (42) extending from the central region (40) in a vertical direction sloping to the first rail (2a) and is attached to the first rail (2a), a third strut (43), of the central region (40) extends in a vertical direction rising to the second profiled rail (2b) and is fastened to the second profiled rail (2b), and has a fourth brace (44) sloping from the central region (40) in a vertical direction to the second profiled rail (2b) extends and is fastened to the second profiled rail (2b). Mast according to claim 1 or 2, characterized in that the struts (41-44) are each separated from each other on the profile rails (2a, 2b) by means of their own attachment interfaces (BF1-BF4) are attached. Lifting mast according to one of claims 1 to 3, characterized in that an upper side (50) of the struts (41-44) at least partially from the load-remote side of the lifting mast (1) to the load-facing side of the mast (1). rising and a bottom (51) of the struts (41-44) at least partially sloping from the load-remote side of the mast (1) to the load-facing side of the mast (1). Lifting mast according to one of claims 1 to 4, characterized in that in the profile rails (2a, 2b) provided with the lifting device lifting slid is longitudinally displaceable and the lifting mast (1) for raising and lowering of the lifting carriage in the rails (2a, 2b) is provided with a Hubzylindereinrichtung (5), wherein the Hubzylindereinrichtung (5) with a lifting means (10) is operatively connected, which is fastened with a first end to the lifting and with a second end (10b) to the mast (1) is and is deflected at the Hubzylindereinrichtung (5), wherein the Hubzylindereinrichtung (5) on the cross member (3) is supported and / or the lifting means (10) is fixed to the cross member (3). Lifting mast according to Claim 5, characterized in that the lifting cylinder device (5) is arranged between the profiled rails (2a, 2b), the lifting cylinder device (5) being supported on the central region (40) of the crossbeam (3) and / or the lifting means (5). 10) is attached to the central region (40) of the cross member (3). Mast according to one of claims 1 to 6, characterized in that the cross member (3) is integrally formed. Lifting mast according to claim 7, characterized in that the cross member (3) is designed as a forging component or as a cast steel component. Mast according to claim 7, characterized in that the cross member (3) is formed as a sheet metal part. Mast according to one of claims 1 to 6, characterized in that the cross member (3) is formed in several pieces. Mast according to claim 10, characterized in that the cross member (3) from the central region (40) and the struts (41-44) is composed, wherein the Struts (41-44) are attached to the central region (40) by welds or screw connections. Lifting mast according to claim 11, characterized in that the central region (40) is designed as a forging component or as a cast steel component. Mast according to claim 11 or 12, characterized in that the first strut (41) and the second strut (42) of a first sheet metal part (60) and the third strut (43) and the fourth strut (44) of a second sheet metal part ( 61) are formed, wherein the two sheet-metal shaped parts (60, 61) are fixed to the central region (40) by welded joints or screw connections. Lifting mast according to one of claims 1 to 13, characterized in that the load-receiving means as a fork with two forks (30), wherein the see-through openings (45a, 45b) on the cross member (3) has a view of an operator located on a driver's workplace of the truck allow the fork tines (30a) of the forks (30) in the fully lowered position of the lifting device. Lifting mast according to one of claims 1 to 14, characterized in that the lifting mast (1) is designed as a stationary mast of einschüssigen mast. Lifting mast according to one of claims 1 to 14, characterized in that the lifting mast (1) is designed as an extension mast of a multi-branch mast.

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